CN102758715B

CN102758715B - Igniting device of transformer primary coil input oscillation current type engine and implementing method

Info

Publication number: CN102758715B
Application number: CN201210274368.8A
Authority: CN
Inventors: 余兆辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-28
Filing date: 2012-08-03
Publication date: 2015-04-22
Anticipated expiration: 2032-08-03
Also published as: CN102758715A

Abstract

The invention provides an igniting device of a transformer primary coil input oscillation current type engine. The igniting device consists of a main body circuit and an auxiliary circuit, wherein the main body circuit generates intermittent high voltage power controlled by a signal and can set or adjust voltage of the high voltage power, length of duration time and energy, and the auxiliary circuit can try the best effort to overcome or avoid influence and harm caused by the situation that the normal work of the device is influenced or other unexpected situations. The invention further provides an implementing method of the high voltage power for the spark discharge ignition of the engine. The implementing method comprises the steps that a current oscillator generates oscillation current, an igniting signal controls output of the oscillation current, a power amplifying circuit amplifies power of the oscillation current, and the oscillation current with amplified power is input into a step-up transformer to perform voltage boosting. By means of the igniting device and the implementing method, the igniting requirement for high voltage spark discharge ignition of the engine can be met well.

Description

Primary of transformer input oscillating current formula engine ignitor and implementation methods

Technical field

The present invention relates to and a kind ofly can export teasel root high-tension electricity with the input of control signal and stopping, and can set or adjust the high-tension electricity output unit of the voltage levels of this high-tension electricity, endurance length and energy size.Especially a kind of ignition mechanism and implementation methods that can meet engine high pressure spark discharge ignition well.

Background technique

Technology at present for engine high pressure spark discharge ignition mainly contains two kinds of modes: one is capacitance energy storage type spark discharge ignition technology.Its working method is, by electric discharge suddenly after capacitor charging to primary coil of boosting transformer (being commonly called as high pressure packet), make the secondary coil induction of boosting transformer produce high-tension electricity, this high-tension electricity is sent to spark plug and forms sparkover, thus lights inflammable mixture.Another kind is inductive type spark discharge ignition technology.Its working method is, make primary coil of boosting transformer power-off suddenly under the state of energising, due to the unexpected change of magnetic flux, cause the secondary coil induction of boosting transformer to produce high-tension electricity, this high-tension electricity is sent to spark plug and forms sparkover, thus lights inflammable mixture.

The above, these the two kinds of technology at present for engine high pressure spark discharge ignition also exist following shortcoming: the first, and the energy of sparkover is little, the ability of resistant spark plug carbon distribution; The second, spark duration is short, sometimes evenly, in time, reliably can not light inflammable mixture; 3rd, boosting transformer metal iron core is made permeability magnetic material and is made, and volume, the weight of output unit electric power are all larger, and energy loss is also large; 4th, use material many, cost is high.5th, the life-span is short.

Moreover first, second two shortcomings above-described are all the negative factors affecting Fuel Economy and harmful gas emission.

Summary of the invention

The object of the invention is: with simple circuit, compared with little volume, compared with little quality with originally realize compared with low being made into that a kind of output voltage is high, energy is large, loss is little, spark duration is long, and highly sensitive, motor can be made efficiently to light a fire when any rotating speed, can improve further fuel economy and reduce harmful gas emission, long-life engine high pressure spark discharge ignition device.Further, on the one hand the voltage levels of high-tension electricity that exports of the present invention and the spark discharge energy produced by this high-tension electricity and spark duration can carry out setting or adjusting as required; Two aspect the present invention are provided with various protection circuit.

The technical solution used in the present invention is:

A kind of primary of transformer input oscillating current formula engine ignitor, it is made up of main body circuit and auxiliary cicuit.

Described main body circuit, comprising: accumulator 3, current oscillator 17, spark energy setting or Circuit tuning 16, fire signal transducer 10, fire signal input circlult 11, signal pulsewidth expand circuit 12, oscillating current output control circuit 13, oscillating current power amplification circuit 9 and boosting transformer 14.

(1) accumulator 3 is by electrolytic condenser C ₂with small capacity ceramic capacitor C ₃composition.

C ₂and C ₃after parallel connection, according to polarity one end of electrolytic condenser immediately preceding D ₂after, the other end is connected with the negative pole of input power and forms charge circuit.

(2) current oscillator 17 is by R ₉, C ₇form with the pin 8 of UC3845, pin 4.

R ₉one end be connected with 8 pin of UC3845, the other end is then connected with 4 pin of UC3845; C ₇one end be connected with 4 pin of UC3845, the other end ground connection.

(3) by above R ₉and C ₇form again a spark energy setting or Circuit tuning 16 simultaneously.

(4) fire signal transducer 10 adopts minitype iron core transformer T ₁.

Need the fire signal of conversion from T ₁primary coil one end input, T ₁the other end ground connection of primary coil; T ₁secondary coil with the Same Name of Ends of the grounding end of primary coil and R ₄lighting outlet be connected, T ₁the other end ground connection of secondary coil.

(5) by R ₄and VT ₃composition fire signal input circlult 11.

R ₄one end and VT ₃base stage be connected, the other end and T ₁being connected with the Same Name of Ends of the grounding end of primary coil of secondary coil; VT ₃collector electrode be connected with 2 pin of NE555, VT ₃grounded-emitter connection.When not needing conversion fire signal, R ₄one end and VT ₃base stage be connected, fire signal is from R ₄the other end input.

(6) by R ₅, R ₆, C ₅, C ₆form signal pulsewidth with NE555 and expand circuit 12.

Here signal pulsewidth expands circuit 12 is exactly in fact a monostable flipflop, and the 5V burning voltage that this monostable flipflop is exported by 8 pin of UC3845 provides power supply.

(7) by R ₇, D ₅, VT ₄, R ₈oscillating current output control circuit 13 is formed with the pin 3 of UC3845, pin 8, pin 6.

R ₇and D ₅after series connection, one end is connected with 3 pin of NE555, the other end and VT ₄base stage be connected, D ₅connection be forward connect; VT ₄collector electrode be connected with 3 pin of UC3845, VT ₄grounded-emitter connection; R ₈one end be connected with 3 pin of UC3845, the other end is connected with 8 pin of UC3845; The oscillating current of the output-controlled system of 6 pin of UC3845.

When not installing signal pulsewidth and expanding circuit 12, R ₇, D ₅and VT ₄all need not install, and VT ₃collector electrode be just connected with 3 pin of UC3845.

(8) by pin 6, the R of UC3845 ₁₀, VT ₆and T ₂primary coil composition oscillating current power amplification circuit 9.

R ₁₀one end be connected with 6 pin of UC3845, the other end and VT ₆grid be connected; VT ₆drain electrode and T ₂primary coil one end be connected, VT ₆source ground.

(9) one end of primary coil of boosting transformer 14 and VT ₆drain electrode be connected, the other end is connected with the positive pole of accumulator, and the secondary coil of boosting transformer 14 exports igniting high-tension electricity.

Described auxiliary cicuit; it is when affecting that this device normally works or some other unexpected situation and occur; can to do one's best the impact and harm that overcome or avoid these situations may cause this device or other things, to comprise: insurance circuit 1, electric power polarity wiring error protective circuit 2, energy dissipating circuit 4, suppress high pressure spike circuit 5, overvoltage crowbar 6, overheating protection circuit 7, prevention electromagnetic interference circuit 15 and fire signal input end wiring error protective circuit 8.

(1) at the input end series connection FU of power supply, as insurance circuit 1.

(2) the diode D that a forward of connecting again after FU connects ₂form electric power polarity wiring error protective circuit 2.

(3) energy dissipating circuit 4 is by D ₁, D ₂, D ₃, R ₁, R ₂, R ₃, VT ₁, VT ₂and C ₁.

Wherein by D ₁, R ₁and VT ₁the series circuit that formed in order of base stage form VT ₁base circuit, by R ₂, D ₃, and VT ₂the series circuit that formed in order of base stage form VT ₂base circuit, VT ₁collector electrode and R ₂and D ₃between line connect, R ₃one end and VT ₂collector electrode connects, R ₃the other end and R ₂not connection D ₃one end be connected, be then connected with the positive pole of accumulator again, C ₁one end and D ₁and R ₁line connect, the other end and VT ₁emitter be connected, VT ₁the input end of base circuit and VT ₂base circuit input end between connect D ₂, VT ₁emitter and VT ₂emitter be connected.

(4) suppress high pressure spike circuit 5 by RV, ZD ₂composition.

One end of RV is immediately preceding after FU, and the other end is connected to the ground, ZD ₂opposite direction connection is at VT ₆grid and ground between.

(5) overvoltage crowbar 6 is by ZD ₁, R ₁₁, R ₁₂, C ₈, VT ₅form with the pin 1 of UC3845.

R ₁₁with the reference diode ZD of Opposite direction connection ₁after series connection, an end is connected on VT ₅base stage on, another termination accumulator positive pole, R ₁₂with C ₈after in parallel, one end connects VT ₅base stage, the other end ground connection, VT ₅grounded-emitter connection, VT ₅collector electrode be connected with 1 pin of UC3845.

(6) overheating protection circuit 7 is by R ₁₂, C ₈, VT ₅, the pin 8 of negative temperature coefficient thermistor RT and UC3845, pin 1 form.

8 pin of the one termination UC3845 of RT, another termination VT ₅base stage, other wiring and above (5) point are about described identical.

(7) prevent electromagnetic interference circuit 15 by the good small capacitor C of a high frequency characteristics ₄one termination VT ₃base stage, the other end ground connection form.

(8) fire signal input end wiring error protective circuit 8 is by R ₄and D ₄composition.

Wherein a kind of connecting means can be, D ₄with VT ₃the in parallel and Opposite direction connection of base stage, R ₄one end connect VT ₃base stage, the other end connect fire signal; Another kind of connecting means can be, D ₄with VT ₃base series and forward connect, R ₄one end connect D ₄, the other end connects fire signal.

Described fire signal transducer 10 is just installed when needs conversion fire signal, otherwise does not install; Described signal pulsewidth expands circuit 12 and just installs when the pulse width of fire signal can not meet the needs of spark duration and will expand the pulse width of fire signal, otherwise does not install.

Except external lead wire and insurance circuit 1, the circuit insulating material of whole device is filling sealed.Wherein, fire signal transducer 10 and boosting transformer 14, can be independently filling sealed with insulating material, also can to reinstate insulating material filling sealed with whole circuit one.

An implementation methods for the acquisition of motor spark discharge ignition high-tension electricity, it comprises following implementation step:

(1) oscillating current is produced by current oscillator;

(2) output of oscillating current is controlled by fire signal;

(3) with power amplification circuit, power amplification is carried out to oscillating current;

(4) the oscillating current input boosting transformer that power has been exaggerated is boosted.

Here is the effect of each constituent element of the present invention:

One, the effect of main body circuit

The effect of main body circuit of the present invention is: make this device draw the teasel root oscillating current with enough power along with the input of control signal and stopping, and by boosting transformer, this teasel root oscillating current is become the output of teasel root high-tension electricity, main body circuit of the present invention sets within the specific limits as required or adjusts the voltage levels of this high-tension electricity, endurance length and energy size simultaneously, especially enables the needs meeting engine high pressure spark discharge ignition well.

Describe the effect of each fraction of main body circuit of the present invention below:

(1) effect of accumulator 3 is, the input power larger to power circuit all-in resistance (comprising the internal resistance of source), or the input power larger to voltage functuation carries out energy storage and filtering, to make input power better for the whole circuit of this device provides electric energy.

(2) effect of current oscillator 17 produces oscillating current.

(3) spark energy setting or the dutycycle of Circuit tuning 16 to above-mentioned oscillating current set or adjust.By like this, just can set or adjust the voltage levels and energy size that export high-tension electricity within the specific limits.

(4) fire signal transducer 10, the fire signal being not suitable for this device is converted to the fire signal being suitable for this device, make this device and other engine igniting systems, such as inductive type Computer controlled ignition system and other similar with it ignition systems realize compatible.

(5) fire signal input circlult 11, enables this device of fire signal instruction export igniting high-tension electricity.

(6) signal pulsewidth expansion circuit 12 pairs of fire signals process, it is by setting or adjust the pulse width of fire signal, carrying out the endurance setting or adjust oscillating current output, is also the endurance of high-tension electricity output or the endurance of spark.

(7) oscillating current output control circuit 13, makes this device when there being fire signal to input, and exports oscillating current; After fire signal disappears, stop exporting oscillating current.

(8) oscillating current power amplification circuit 9 pairs of oscillating currents carry out power amplification.

(9) boosting transformer 14, carries out transformation rising to the voltage of the oscillating current that above-mentioned power has been exaggerated, and makes this device export the high-tension electricity that can meet engine ignition needs.

Two, the effect of auxiliary cicuit

The effect of auxiliary cicuit of the present invention is: it is when affecting that this device normally works or some other unexpected situation and occur, can the do one's best impact or harm that overcome or avoid these situations may cause this device or other things.

(1) when certain reason causes the total current of this device circuit excessive, insurance circuit 1 will action, cuts off input power, thus protects this device can not work the mischief because of current overload.

(2) polarity of electric power polarity wiring error protective circuit 2 pairs of input powers identifies, when electric power polarity wiring error (i.e. the mutual wrong of both positive and negative polarity), for carrying out protection to the components and parts of electric polarity sensitivity in the circuit of this device.

(3) Capacity of the capacitor of this device accumulator 3 is larger, and the static power consumption of the whole circuit of this device is very small, so, during with regard to likely cutting off external power supply not needing engine ignition, also need the longer time, the electric energy in capacitor just can discharge.Here, if can not in time the electric energy of accumulator 3 li be discharged post, so within the longer time, when there being unexpected " fire signal " to input, this device just likely exports high-tension electricity with the input of unexpected " fire signal " mistakenly, and this device just likely can make motor produce mistake igniting with the input of unexpected " fire signal " in other words.Should say, this device exports high-tension electricity mistakenly or this mistake igniting occurs motor, is all have certain harmfulness.So, we should manage to cut off the electricity supply at this device, and do not need this device to export high-tension electricity, when not needing engine ignition in other words, make the electric energy in accumulator, discharge within the as far as possible short time, thus make this device in this case, can not, at least also extremely can there is above-mentioned mistake in difficulty.Here, the energy dissipating circuit 4 of this device just serves and makes this device can not, at least also extremely difficulty can export high-tension electricity mistakenly, in other words the energy dissipating circuit 4 of this device just serve make this device can not, at least also extremely difficult effect that can make motor that this mistake igniting occurs.

(4) when having high pressure spike to attack the low-voltage circuit of this device due to various situation; suppress high pressure spike circuit 5 can suppress this high pressure spike; make the voltage in this device low-voltage circuit maintain in certain scope, do not damage by high pressure spike to protect the components and parts that can not bear high-tension electricity in the circuit of this device.

(5) effect of overvoltage crowbar 6 is, when inputting voltage higher than our setting in certain limit of the supply voltage of this device circuit, giving an order, make this device stop exporting high-tension electricity, in order to avoid cause damage to this device.

(6) when due to radiating condition good not; or other reasons causes the temperature of this device; the particularly temperature of the power amplification components and parts that heating value is larger; when exceeding the zero point of our setting; the overheating protection circuit 7 of this device will be given an order; force this device current power that stops oscillation to amplify and export, thus temperature is declined.

(7) electromagnetic interference circuit 15 is prevented, interference fire signal and fire signal input circlult 11, signal pulsewidth being expanded to circuit 12 that can prevent inside circuit and the outside spuious electromagnetism existed from producing, in order to avoid it produces false command to the high-tension electricity output time of this device and duration, guarantee the accuracy of the moment that the high-tension electricity of this device exports and duration.

(8) fire signal input end wiring error protective circuit 8; can make a mistake due to wiring or other reasons and cause the fire signal input end in fire signal input circlult 11 to be applied in too high forward voltage or backward voltage time; protection fire signal input circlult 11, makes it to cause damage because of overvoltage or overcurrent within the specific limits.

If install and use fire signal transducer 10, so the effect of fire signal input end wiring error protective circuit 8 is exactly for current limliting and water conservancy diversion are carried out in the output of fire signal transducer 10.

Accompanying drawing explanation

Fig. 1 is the circuit structure block diagram of wherein a kind of embodiment of the present invention.

Fig. 2, Fig. 3, Fig. 4 are the circuit diagram of an embodiment in the mode of execution of Fig. 1 respectively.

Fig. 2, Fig. 3 are again the circuit diagram of the example realizing the object of the invention with monofocal transducer respectively.

Fig. 4 is the circuit diagram of the example realizing the object of the invention with push-pull converter.

In Fig. 1, fire signal transducer 10 and signal pulsewidth expand the sash of circuit 12 and the indicating arrow dotted line of fire signal transducer 10 draws, represent: when needs conversion fire signal, igniting signal adapter 10 is just installed, when not needing conversion fire signal, just not mounting points fire signal adapter 10; When needing the pulse width expanding fire signal, signal pulsewidth being just installed and expanding circuit 12, when not needing the pulse width expanding fire signal, signal pulsewidth not just being installed and expanding circuit 12.

Fig. 2 is the typical embodiment that function ratio of the present invention is more complete.On the one hand, it be configured with expansion Applicable scope the fire signal of inductive type ignition system or other similar fire signals, convert the circuit of the fire signal being suitable for this primary of transformer input oscillating current formula engine ignitor to, namely be configured with fire signal transducer 10, achieve compatibility; Two aspects, it is configured with the circuit expanding fire signal pulse width, and namely signal pulsewidth expands circuit 12, can set or adjust the time that spark continues as required.

Embodiment shown in Fig. 3, Fig. 4, is omitted fire signal transducer 10 and signal pulsewidth expands circuit 12.

Embodiment

First illustratively, following table is the components and parts letter symbol table of comparisons used in embodiment of the present invention circuit diagram.

In the circuit diagram of the embodiment of the present invention, the numeral in the components and parts letter symbol lower right corner is the sequence numbers of each components and parts in the circuit diagram of same embodiment.If in the circuit diagram of same embodiment, the components and parts of a certain type only have one, and so the lower right corner of its letter symbol does not just have sequence number.The components and parts of the same type of same effect, the sequence number in each embodiment's circuit diagram is not necessarily identical.In order to for simplicity, below in the describing of each embodiment, write out the title of each components and parts no longer one by one, can identify that letter symbol and sequence number thereof, when representing which components and parts, generally just write out its letter symbol and sequence number thereof.

Embodiments of the present invention and embodiment can be diversified.Below, only with regard to the circuit of Fig. 2, Fig. 3, the Fig. 4 in the above accompanying drawing, the example respectively as an embodiment explains.

Embodiment 1(as shown in Figure 2)

The present embodiment is the example realizing the object of the invention with monofocal transducer.

The concrete composition of one the present embodiment

The present embodiment employs two intergrated circuit: one is that pulse width control (PWM) intergrated circuit UC3845(is hereinafter referred to as UC3845); One is that time-base integrated circuit NE555(is hereinafter referred to as NE555).In the present embodiment, 2 pin of UC3845 and 5 pin ground connection.

(1) main body circuit

Below each concrete constituent element of the present embodiment main body circuit:

(4) minitype iron core transformer T ₁as fire signal transducer 10(T here ₁lighting outlet dotted line draw, being represent when not needing conversion fire signal, just T not being installed ₁).

(5) by R ₄and VT ₃composition fire signal input circlult 11.

(9) T ₂namely be boosting transformer 14.Here, T ₂it is a ferrite high-frequency step-up transformer.

T ₂one end of primary coil be connected with the positive pole of accumulator, the other end and VT ₆drain electrode be connected, igniting high-tension electricity then from T ₂secondary coil export.

(2) auxiliary cicuit

The auxiliary cicuit of the present embodiment is specially:

(1) at the input end series connection FU of power supply, be exactly insurance circuit 1.

(3) by D ₁, D ₃, R ₁, R ₂, R ₃, VT ₁, VT ₂and C ₁composition energy dissipating circuit 4.

(4) suppress high pressure spike circuit 5 by RV, ZD ₂composition.

One end of RV is immediately preceding after FU, and the other end is connected to the ground; ZD ₂opposite direction connection is at VT ₆grid and ground between.

(5) by ZD ₁, R ₁₁, R ₁₂, C ₈, VT ₅overvoltage crowbar 6 is formed with UC3845 pin 1.

(6) by R ₁₂, C ₈, VT ₅, the pin 8 of negative temperature coefficient thermistor RT and UC3845, pin 1 form overheating protection circuit 7.

8 pin of the one termination UC3845 of RT, another termination VT ₅base stage, other wiring and above overvoltage crowbar are about described identical.

(7) by the small capacitor C that a high frequency characteristics is good ₄one termination VT ₃base stage, the other end ground connection forms prevention electromagnetic interference circuit 15.

(8) by R ₄, D ₄composition fire signal input end wiring error protective circuit 8.

The working procedure of two the present embodiment

(1) working procedure of main body circuit

After switching on power, source current flows through FU, D ₂, enter accumulator 3 to C ₂charging energy-storing filtering, provide electric energy then to whole circuit.And UC3845 obtain electric after, its 8 pin export 5V stable reference voltages again to current oscillator 17, signal pulsewidth expands circuit 12, oscillating current output control circuit 13 and overheating protection circuit 7 provides electric energy.

During beginning, at R ₉, C ₇with under the effect of the pin 8 of UC3845, pin 4, current oscillator 17 generation current vibrates.

Here the monostable flipflop of circuit 12 is expanded as signal pulsewidth, at VT ₃base stage keep stable state when not having signal to input, discharge end 7 pin of NE555 is in saturation conduction state, C ₆to ground electric discharge, 3 pin no signals export.

At this moment the VT in oscillating current output control circuit 13 ₄end owing to there is no base current.Again because 3 pin of UC3845 pass through R ₈be connected with 8 pin, so at VT ₄during cut-off, the current potential of 3 pin of UC3845 is exactly the 5V reference potential that 8 pin export, and it is greater than 1V, so 6 pin of UC3845 are closed output.The oscillating current power amplification circuit 9 of this device is due to VT ₆grid does not have voltage input and do not have power stage, T ₂, namely boosting transformer 14 does not just have high-tension electricity to export yet.

Now, the T as fire signal transducer 10 is given by the fire signal of inductive type ignition system ₁primary coil input direct-current electric current, current direction is upper just lower negative.During beginning, this electric current changes from small to big, T ₁secondary coil produces induced electromotive force thereupon, and its Same Name of Ends induced electromotive force direction is contrary with the direction of primary coil input current, i.e. T ₁secondary coil induced electromotive force direction is lower just upper negative.At this moment, T ₁the induced current of secondary coil flows through D ₄, then by R ₄loop is formed, the VT in fire signal input circlult 11 after current limliting ₃base stage is in the effect of counterelectromotive force, does not have electric current to flow through, and its collector electrode does not have conducting.

As input T ₁the electric current of primary coil just remains unchanged, so T after changing from small to big and acquiring a certain degree ₁just do not have flux change, its secondary coil does not just have induced electromotive force yet.At this moment, VT ₃base stage do not have electric current to flow through too, its collector electrode does not have conducting yet.

Work as T ₁when the electric current of primary coil disconnects suddenly, T ₁secondary coil at once produces induced electromotive force again, and the direction of this induced electromotive force is contrary with above-mentioned, to bear just down for upper.At this moment, T ₁the induced current of secondary coil is exactly the fire signal of the present embodiment.This fire signal starts to enter igniting signal input circuit 11.It is through R ₄after current limliting, then flow through VT ₃base stage formed loop, make VT ₃produce base current.

At this moment, VT ₃base current make VT ₃saturation conduction immediately, the current potential of its collector electrode drops to about 0.3V suddenly.Because the current potential of 2 pin of NE555 is exactly VT ₃the current potential of collector electrode, so work as VT ₃during saturation conduction, the 2 pin current potentials of NE555 are exactly about 0.3V, it lower than 1/3 × 5V. like this, above-mentioned monostable flipflop is triggered immediately and enters temporary stable state, make 7 pin of NE555 stop electric discharge immediately, and 3 pin of NE555 just there is electric current to export immediately and last till that above-mentioned temporary steady state time terminates.Here, 3 pin of NE555 export electric current is exactly the extended signal code of the pulse width of the present embodiment.Above-mentioned temporary steady state time is by R ₆and C ₆determine.

The fire signal that above-mentioned pulse width is extended, enters oscillating current output control circuit 13 at once.

In oscillating current output control circuit 13, the electric current of the 3 pin outputs of NE555 is through R ₇d is flowed through after current limliting ₅and VT ₄base stage to ground, thus make VT ₄saturation conduction, so VT ₄the status of collector electrode drops to about 0.3V suddenly.Now, with VT ₄the 3 pin current potentials of the UC3845 that collector electrode is connected also are about 0.3V, and it is many that it is less than 1V, so 6 pin of UC3845 just export square wave oscillation electric current immediately.The endurance of this square wave oscillation electric current equals the temporary steady state time of above-mentioned monostable flipflop.

In oscillating current power amplification circuit 9, the square wave oscillation electric current that 6 pin of above-mentioned UC3845 export passes through R ₁₀deliver to VT ₆grid, drive VT in the form of a voltage ₆carry out power amplification.

At this moment, with VT ₆the T that drain electrode is connected ₂the primary coil of (i.e. boosting transformer 14) also obtains the input of the oscillating current that is exaggerated, and at T ₂secondary coil will export igniting high-tension electricity.This high-tension electricity is sent to spark plug, just can carry out spark discharge ignition to motor.

In above-mentioned temporary steady state time, 8 pin of UC3845 pass through R ₆to C ₆charging.C ₆voltage rise because of charging.Work as C ₆voltage rise to when being greater than 2/3 × 5V, with C ₆the 6 pin current potentials of NE555 be connected rise to equally and are greater than 2/3 × 5V, and at this moment T ₁the induced current of secondary coil disappears, so above-mentioned monostable flipflop gets back to steady state immediately, and T ₂high-tension electricity is just stopped to export immediately.

Until when next light-off period arrives, this device repeats again above-mentioned process.Move in circles like this, just can continuously for engine high pressure spark discharge ignition provides high-tension electricity.

The explanation of other problems:

(1) in spark energy setting or Circuit tuning 16, setting or adjustment R when keeping oscillator frequency constant ₉resistance and C ₇the size of capacity, the dutycycle of the square wave oscillation electric current that 6 pin that just can set or adjust UC3845 within the specific limits export.Within the specific limits, this dutycycle is larger, the high-tension electricity voltage that boosting transformer 14 exports, and it is also larger to carry out the spark energy of sparkover by this high-tension electricity; Otherwise it is less.

(2) expand in circuit 12 in signal pulsewidth, setting or adjustment R ₆and C ₆size, just can set or adjust the length of the temporary steady state time of above-mentioned monostable flipflop, and then just can set or adjust high-tension electricity output duration, be i.e. the length of spark duration.

(3) C ₃a small capacity ceramic capacitor, it and electrolytic condenser C ₂connecing after parallel connection in circuit, is the high-frequency work characteristic in order to improve circuit.

(4) C ₅be a small capacity ceramic capacitor, it is connected between 5 pin of NE555 and ground, can eliminate high-frequency electromagnetic interference, NE555 monostable flipflop is stably worked.

(5) R is accessed in circuit ₇effect be for NE555 3 pin export and VT ₄base stage input current limliting.

(6) D is accessed in circuit ₅, be to raise VT ₄the current potential of base stage, prevents VT ₄base stage erroneous input, to guarantee the stability that oscillating current output control circuit 13 works.

(7) R is accessed in circuit ₈effect be VT ₄collector electrode current limliting.

(8) R is accessed in circuit ₁₀, can VT be prevented ₆self oscillations is produced, with the work of stable oscillation stationary vibration current power amplification circuit 9 when high-frequency work.

(9) if the signal code insufficient strength of above-mentioned input igniting signal adapter 10, one stage signal amplification circuit can be added before fire signal transducer 10.

(10) when not needing conversion fire signal, fire signal is from R ₄lighting outlet input.

(11) in selection circuit during the parameter of components and parts; notice that current oscillator 17, signal pulsewidth expand circuit 12, oscillating current output control circuit 13 and overheating protection circuit 7, the summation of electric current that time these four parts work simultaneously, institute consumes the 8 pin outputs of UC3845 does not exceed 50mA.Here, under the prerequisite ensureing circuit stability work, the current drain of these four parts should be reduced as far as possible.

(2) working procedure of auxiliary cicuit

(1) when certain reason causes the total current of this device circuit excessive, because heating FU just fusing, thus the power supply of this device is cut off immediately.

(2) the electric power polarity wiring error protective circuit 2 of the present embodiment works like this: well-known, has a lot of components and parts to be to bear certain backward voltage effect in circuit, if by the reverse polarity connection of its input power, just may be damaged.In the present embodiment, when we access power supply, only have correct wiring, this device ability input power electric current, works normally.If carelessness is by power positive cathode wrong, in the present embodiment, due to D ₂there is unilateral conduction, now D ₂two terminations be backward voltage and can not conducting, make the circuit of whole device can not input power electric current, so protect circuit.

(3) working procedure of energy dissipating circuit 4: when switching on power, source current flows through D ₁, by low value capacitor C ₁r is flowed through again after filtering ₁to VT ₁base current is provided, makes VT ₁saturation conduction.Here because VT ₂the pressure drop of base stage and D ₃pressure drop superposition after be greater than VT ₁pressure drop during collector electrode saturation conduction, so VT ₂base stage does not have electric current to flow through, VT ₂cut-off, with VT ₂the R that collector electrode is connected ₃not consumed energy.After the input power of this device disconnects, due to D ₂be in the effect of the backward voltage of accumulator 3, accumulator 3 can not give VT ₁base stage provides electric current, so VT ₁dead electricity and ending, VT soon ₂the saturation conduction because base potential raises, so the C in accumulator 3 ₂, C ₃stored electric energy will through R ₃, VT ₂discharge soon.

(4) the suppression high pressure spike circuit 5 of the present embodiment works like this: first, when the high pressure spike exceeding a certain numerical value that certain reason produces appears at the two ends of this installation's power source input, the resistance of RV sharply can be reduced to a low value, make high pressure spike at the two ends by-path turn-on that this installation's power source inputs, force the magnitude of voltage of this high pressure spike to be reduced to the scope of a safety, guarantee that it can not produce harm to this device.The second, because this device is a device producing high-tension electricity, internal circuit also includes inductive switches, so just likely penetrates into this device circuit inside because electromagnetic induction etc. produces voltage spike, thus to VT ₆grid produce threaten.Here, when the voltage of this high pressure spike is more than ZD ₂voltage stabilizing value time, ZD ₂this high pressure spike will be switched to ground, make VT ₆the current potential of grid can not exceed safety value, and is protected.

(5) overvoltage crowbar 6 of the present embodiment works like this: a kind of possible situation is; the generator mu balanced circuit of engine assembly is malfunctioning; its output voltage will raise with the rising of engine speed; if at this moment do not have overvoltage crowbar, this more and more higher voltage will make and use this device circuit of this power supply to burn.Here, when this happens, as long as the voltage that the supply voltage inputting this device circuit sets higher than us, ZD ₁will temporarily be punctured immediately.Breakdown current is through R ₁₂flow to ground, make R ₁₂produce voltage drop.When this voltage drop reaches VT ₅during the conducting voltage of base stage, VT ₅just start conducting, and its collector potential starts to decline.Work as VT ₅when collector potential drops to lower than 1V, the 1 pin current potential of UC3845 is also lower than 1V, and therefore, 6 pin of UC3845 close output immediately.Whether at this moment, no matter have fire signal to input, this device does not all have high-tension electricity export and cannot produce discharge spark and go as engine ignition, therefore engine misses.Again because engine misses, so the output voltage of the generator of engine assembly will stop rising, the voltage inputting this device circuit would not exceed safety value and be protected.In addition; when some other reason occurs; such as misapply the higher power supply of voltage ratio design voltage, power-supply battery joint looseness and just by the power source charges etc. of other high voltage; in a word; as long as the voltage that the supply voltage inputting this device designs higher than us, overvoltage crowbar 6 action of this device all may be caused.But, be not say that this device just can bear the input of supply voltage high arbitrarily, should the size withstand voltage according to actual design use during use.Further, when occurring overvoltage crowbar 6 action, should check power circuit in time, fixing a breakdown, to make engine work.

(6) overheating protection circuit 7 of the present embodiment works like this: each components and parts in this device circuit operationally all can produce heat; particularly power amplifying device; operationally can produce more heat; at this moment; if radiating condition is good not, heat will be made cumulative, and temperature is more and more higher; when temperature rises to a certain degree, some components and parts of this device will be burnt.The overheating protection circuit 7 of this device, can avoid causing temperature too high because this radiating condition is good not and makes some components and parts of this device be burnt.In the overheating protection circuit 7 of the present embodiment, the 5V stable reference voltage of the 8 pin outputs of UC3845 is through RT, R ₁₂ground connection carries out dividing potential drop.When the temperature of the temperature of this device, particularly power amplifying device raises, the resistance of RT will along with reduction, RT and R simultaneously ₁₂dividing potential drop effect make R ₁₂voltage drop increase.The same with above-described overvoltage crowbar 6, work as R ₁₂pressure drop reach VT ₅during the conducting voltage of base stage, VT ₅just start conducting, and its collector potential starts to decline.Work as VT ₅when collector potential drops to lower than 1V, the 1 pin current potential of UC3845 is also lower than 1V, and therefore, 6 pin of UC3845 close output immediately, and oscillating current power amplification circuit 9 also stops power stage.At this moment, engine misses.After the oscillating current power amplification circuit 9 of this device stops power stage, substantially reduce the number the heating value of circuit, so temperature starts to decline.At this moment, only have when temperature is reduced within the scope of permitted value, the oscillating current power amplification circuit 9 of this device just can recover power stage.If above-mentioned radiating condition should not, above-mentioned overtemperature protection process also can repeat, so that circulation.When the radiating condition of configuration improves, can distribute each components and parts preferably, the heat particularly produced during power amplifying device work, make the temperature of whole device remain within the scope of permitted value, this device could normally work.It should be pointed out that when there is overheating protection circuit 7 action, should check in time, finding out reason, fixing a breakdown, to make engine work.

(7) electromagnetic interference circuit 15 is prevented to work like this: the present embodiment mainly uses a ceramic capacitor C ₄be connected to VT ₃to realize between base stage and ground preventing electromagnetic interference.When this device internal circuit or space outerpace exist spuious electromagnetism, and when this spuious electromagnetism can produce disturbance current, C ₄will at VT ₃base stage ingress this disturbance current bypass flow to circuit ground connection place, like this, this disturbance current would not channel to VT ₃base stage and false command interference is produced to spark output time and duration, to guarantee that fire signal exports to this device igniting high-tension electricity the accuracy controlled.

(8) fire signal input end wiring error protective circuit 8 works like this: suppose here; fire signal input end in fire signal input circlult 11 makes a mistake or other reasons due to wiring, causes the fire signal input end in fire signal input circlult 11 to be applied in too high forward voltage or backward voltage to a certain extent.The first, when the wiring of fire signal input end wiring error protective circuit 8 is D ₄with VT ₃the in parallel and Opposite direction connection of base stage, R ₄one end connect VT ₃base stage, the other end connect fire signal time, the above-mentioned forward voltage too high be to a certain extent applied in will by R ₄step-down current limliting, makes to flow through VT ₃the electric current of base stage is limited in allowed limits, thus ensures VT ₃base stage can not burn because of overcurrent, and the above-mentioned backward voltage too high be to a certain extent applied in is due to D ₄by-path turn-on, VT ₃the backward voltage that bears of base stage be just limited in about 0.7V, ensure that it can not breakdownly damage; The second, when the wiring of fire signal input end wiring error protective circuit 8 is D ₄with VT ₃base series and forward connect, R ₄one end connect D ₄, when the other end connects fire signal, the above-mentioned forward voltage too high be to a certain extent applied in also can by R ₄step-down current limliting, makes to flow through D ₄and VT ₃the electric current of base stage is also limited in allowed limits, thus ensures VT ₃base stage also can not burn because of overcurrent, and the above-mentioned backward voltage too high be to a certain extent applied in, due to D ₄unilateral conduction be equivalent to increase VT ₃base stage oppositely withstand voltage, and make VT ₃base stage can not by this backward voltage punch through damage too high to a certain extent.

The process of the current limliting that fire signal input end wiring error protective circuit 8 pairs of fire signal transducers 10 export and guide functions, has and describes, repeat no more here in the working procedure of aforementioned body circuit.

The explanation of other problems:

(1) C ₁capacity should not be too large, the too large beginning that can postpone the energy dissipating of energy dissipating circuit 4 for a long time, notably can make energy dissipating circuit 4 ineffective; Too little, too little good not to the filter effect of the too large input power that fluctuates, so that when input power low ebb, VT ₁can not saturation conduction, thus unnecessarily make VT ₂conducting, makes VT on the one hand ₂and R ₃heating up, power supply electric energy is wasted again in two aspects.

(2) small capacity ceramic capacitor C ₈be connected on VT ₅between base stage and ground, the interference of high-frequency electromagnetic to overvoltage crowbar 6 and overheating protection circuit 7 can be eliminated, guarantee the stability that overvoltage crowbar 6 and overheating protection circuit 7 work.

(3) R is accessed in circuit ₁₁, be ZD ₁and VT ₅base stage current limliting.

Embodiment 2(as shown in Figure 3)

The present embodiment (comprising following embodiment 3) is design when not needing conversion fire signal on the one hand; Two aspects are again design when the effective pulse width of fire signal is enough wide.It does not have fire signal transducer 10; Signal pulsewidth is not had to expand circuit 12 yet.

In describing below (comprise embodiment 3 describe), if identical with the content of the example described or roughly the same, and by read circuit figure, just can understand its principle, in order to reduce length, generally just repeating no more or being no longer described in detail.

One, the concrete composition of the present embodiment

The present embodiment employs an intergrated circuit, and it is pulse width control (PWM) intergrated circuit UC3845.In the present embodiment, in the same manner as in Example 1,2 pin of UC3845 and 5 pin ground connection.

(1) main body circuit

(2) current oscillator 17 is by R ₆, C ₅form with the pin 8 of UC3845, pin 4.

R ₆one end be connected with 8 pin of UC3845, the other end is then connected with 4 pin of UC3845; C ₅one end be connected with 4 pin of UC3845, the other end ground connection.

(3) by above R ₆and C ₅form again a spark energy setting or Circuit tuning 16 simultaneously.

(4) by R ₄and VT ₃composition fire signal input circlult 11.

R ₄one end be the input end of fire signal, the other end and VT ₃base stage be connected; VT ₃collector electrode be connected with 3 pin of UC3845, emitter is ground connection then.

(5) by R ₅oscillating current output control circuit 13 is formed with the pin 3 of UC3845, pin 8, pin 6.

R ₅one end be connected with 3 pin of UC3845, the other end is connected with 8 pin of UC3845; The oscillating current of the output-controlled system of 6 pin of UC3845.

(6) by pin 6, the R of UC3845 ₇, VT ₅with primary coil composition oscillating current power amplification circuit 9 of T.

R ₇one end be connected with 6 pin of UC3845, the other end and VT ₅grid be connected; VT ₅drain electrode be connected with one end of primary coil of T, VT ₅source ground.

(7) T is exactly boosting transformer 14.Here, T is also a ferrite high-frequency step-up transformer.

One end of primary coil of T is connected with the positive pole of accumulator, the other end and VT ₅drain electrode be connected, igniting high-tension electricity then export from the secondary coil of T.

(2) auxiliary cicuit

The auxiliary cicuit of the present embodiment, comprises insurance circuit 1, electric power polarity wiring error protective circuit 2, energy dissipating circuit 4 equally, suppresses high pressure spike circuit 5, overvoltage crowbar 6, overheating protection circuit 7, prevents electromagnetic interference circuit 15 and fire signal input end wiring error protective circuit 8.Their composition and above-described embodiment 1 contrast, although the sequence number of some components and parts is different, the connection of its components and parts used in fact and each components and parts is all identical, just repeats no more at this.

Two, the working procedure of the present embodiment

(1) working procedure of main body circuit

Switch on power, accumulator 3 starts energy storage and filtering.UC3845 obtain electric after, export 5V stable reference voltages at 8 pin and provide electric energy to current oscillator 17, oscillating current output control circuit 13 and overheating protection circuit 7.

During beginning, at R ₆, C ₅with under the effect of 8 pin of UC3845,4 pin, current oscillator 17 generation current vibrates.

When not having fire signal to input, the VT in fire signal input circlult 11 ₃because there is no base current, so its collector electrode does not have conducting.Again at VT ₃collector electrode when not having a conducting because 3 pin of the UC3845 in oscillating current output control circuit 13 pass through R ₅be connected with 8 pin, so the current potential of 3 pin of UC3845 is just close to the 5V reference potential that 8 pin export.Again because UC3845 is when the current potential of 3 pin is higher than 1V, 6 pin just do not have oscillating current to export, and the current potential of present 3 pin, close to 5V, is greater than 1V many, so 6 pin just do not have oscillating current to export.Oscillating current power amplification circuit 9 when 6 pin of UC3845 do not have oscillating current to export, VT ₅just there is no power stage, and then T, i.e. boosting transformer 14, just there is no high-tension electricity to export yet.

When having the fire signal of certain effectively pulsewidth to input for one, because VT ₃saturation conduction, the 3 pin current potentials of UC3845 are less than 1V at once, so 6 pin just have oscillating current to export at once.This oscillating current flows through R ₇after, drive VT in the form of a voltage ₅carry out power amplification.In this oscillating current power amplification process, primary coil of boosting transformer 14 is also transfused to the oscillating current be exaggerated simultaneously, so will export high-tension electricity at the secondary coil of boosting transformer 14.This high-tension electricity is sent to spark plug, just can carry out spark discharge ignition to motor.

When fire signal stops, 6 pin of UC3845 are followed immediately and are stopped exporting oscillating current, and this device also just stops exporting high-tension electricity.When next fire signal arrives, the work of circuit repeats again above process.Move in circles like this, just can continuously for engine high pressure spark discharge ignition provides high-tension electricity.

The explanation of other problems:

(1) in spark energy setting or Circuit tuning 16, setting or adjustment R when keeping current oscillator 17 oscillation frequency constant ₆resistance and C ₅the size of capacity, the dutycycle of the square wave oscillation electric current that 6 pin that just can set or adjust UC3845 within the specific limits export.Within the specific limits, this dutycycle is larger, the high-tension electricity voltage that boosting transformer 14 exports, and it is also larger to carry out the spark energy of sparkover by this high-tension electricity; Otherwise it is less.

(2) spark duration of the present embodiment equals effective pulse width time of fire signal.

(3) in selection circuit during the parameter of components and parts; note current oscillator 17, oscillating current output control circuit 13 and overheating protection circuit 7, time these three parts work simultaneously consume UC3845 the summation of electric current that exports of 8 pin do not exceed 50mA.Here, under the prerequisite ensureing circuit stability work, the current drain of these three parts should be reduced as far as possible.

(2) working procedure of auxiliary cicuit

The working procedure of the present embodiment auxiliary cicuit, with the identical of above-described embodiment 1 or roughly the same, does not repeat them here.

Embodiment 3(as shown in Figure 4)

The present embodiment is the example realizing the object of the invention with push-pull converter.

One, the concrete composition of the present embodiment

The present embodiment intergrated circuit, it is pulse width control (PWM) intergrated circuit SG3525A (hereinafter referred to as SG3525A).In the present embodiment, 1 pin of SG3525A, 2 pin, 3 pin and 12 pin ground connection, 8 pin are then unsettled need not.

(1) main body circuit

(2) by R ₁₁, C ₆, R ₁₂with 6 pin, 5 pin, the 7 pin composition current oscillators 17 of SG3525A.

R ₁₁two ends be connected with ground with 6 pin of SG3525A respectively; C ₆one end be connected with 5 pin of SG3525A, the other end is connected to the ground; R ₁₂two ends be then connected with 7 pin with 5 pin of SG3525A respectively.

(3) by R ₈, R ₉with 16 pin, the 9 spark energy setting of pin composition or the Circuit tunings 16 of SG3525A.

R ₈two ends be connected with 16 pin with 9 pin of SG3525A respectively; R ₉two ends then connect with 9 pin of SG3525A and ground respectively.

(4) by R ₄and VT ₃composition fire signal input circlult 11.

R ₄one end be the input end of fire signal, the other end and VT ₃base stage be connected; VT ₃collector electrode be connected on 10 pin of SG3525A, emitter is then connected to the ground.

(5) by R ₅with 16 pin, 10 pin, 11 pin, the 14 pin composition oscillating current output control circuits 13 of SG3525A.

R ₅two ends be connected with 16 pin with 10 pin of SG3525A respectively; At 11 pin of SG3525A and the oscillating current of the output-controlled system of 14 pin.

(6) by 11 pin of SG3525A, 14 pin and VT ₅, VT ₆and the composition of the primary coil with the middle wiretapping push-pull mode oscillating current power amplification circuit 9 of T.

11 pin of SG3525A, 14 pin respectively with VT ₅, VT ₆grid be connected; VT ₅, VT ₆drain electrode be connected with the two ends of primary coil of T respectively; VT ₅, VT ₆source electrode be ground connection; The centre cap of primary coil of T is then connected with the positive pole of accumulator.

(7) T is exactly boosting transformer 14.Here, T is that a primary coil is with centre tapped ferrite high-frequency step-up transformer.

The centre cap of primary coil of T is connected with the positive pole of accumulator, the two ends of primary coil of T respectively with VT ₅, VT ₆drain electrode be connected, igniting high-tension electricity then export from the secondary coil of T.

(2) auxiliary cicuit

The auxiliary cicuit of the present embodiment, comprises insurance circuit 1, electric power polarity wiring error protective circuit 2, energy dissipating circuit 4 too, suppresses high pressure spike circuit 5, overvoltage crowbar 6, overheating protection circuit 7, prevents electromagnetic interference circuit 15 and fire signal input end wiring error protective circuit 8.Wherein, suppress that high pressure spike circuit 5, overvoltage crowbar 6 and overheating protection circuit 7 and embodiment's 1 is different, other identical or roughly the same.At this, only to suppressing the composition of high pressure spike circuit 5, overvoltage crowbar 6 and overheating protection circuit 7 to carry out describing.

(1) by RV, ZD ₂, ZD ₃and R ₁₀composition suppresses high pressure spike circuit 5.

One end of RV is immediately preceding after FU, and the other end is connected to the ground; ZD ₂, ZD ₃opposite direction connection is at VT respectively ₆, VT ₅grid and ground between; R ₁₀be connected on 13 pin of SG3525A.At ZD ₂and ZD ₃rated current when being greater than the filling electric current of 14 pin of SG3525A and 11 pin respectively, R ₁₀can not install.

(2) by R ₆, R ₇, ZD ₁, VT ₄with the 9 pin composition overvoltage crowbars 6 of SG3525A.

ZD ₁for Opposite direction connection, ZD ₁with R ₇after series connection, an end is connected on VT ₄base stage on, the other end is connected with the positive pole of accumulator; R ₆one end and VT ₄base stage be connected, the other end is connected to the ground; VT ₄collector electrode be connected with 9 pin of SG3525A, VT ₄grounded-emitter connection.

(3) by R ₆, RT, VT ₄with 16 pin, the 9 pin composition overheating protection circuits 7 of SG3525A.

One end of RT is connected with 16 pin of SG3525A, the other end and VT ₄base stage be connected, identical then with described in above overvoltage crowbar of other wiring.

Two, the working procedure of the present embodiment

(1) working procedure of main body circuit

Switch on power, accumulator 3 starts energy storage and filtering.SG3525A obtain electric after, export 5.1V stable reference voltages at 16 pin and provide electric energy to spark energy setting or Circuit tuning 16, oscillating current output control circuit 13 and overheating protection circuit 7.

At R ₁₁, C ₆, R ₁₂with under the effect of 6 pin of SG3525A, 5 pin, 7 pin, current oscillator 17 generation current vibrates.

When not having fire signal to input, the VT in fire signal input circlult 11 ₃because there is no base current, so its collector electrode does not have conducting.Again at VT ₃collector electrode when not having a conducting because 10 pin of the SG3525A in oscillating current output control circuit 13 pass through R ₅be connected with 16 pin, so the current potential of 10 pin of SG3525A is exactly the 5.1V reference potential that 16 pin export.Again because SG3525A is when the current potential of its 10 pin is higher than about 1.4V, 11 pin and 14 pin just do not have oscillating current to export, and the current potential of present 10 pin is 5.1V, is greater than 1.4V many, so 11 pin and 14 pin do not have oscillating current to export.In oscillating current power amplification circuit 9,11 pin and 14 pin of SG3525A do not have oscillating current to export, VT ₅and VT ₆just do not have power stage, at this moment, T, namely boosting transformer 14 does not just have high-tension electricity to export yet.

When having the fire signal of certain pulsewidth to input for one, because the VT in fire signal input circlult 11 ₃saturation conduction, the current potential of 10 pin of the SG3525A in oscillating current output control circuit 13 drops to about 0.3V at once, and it is many that it is less than 1.4V, so 11 pin of SG3525A and 14 pin just have oscillating current to export at once.In oscillating current power amplification circuit 9, the oscillating current that 11 pin of SG3525A and 14 pin export drives VT respectively in the form of a voltage ₅and VT ₆carry out push-pull power amplifier.In the process of power amplification, primary coil of boosting transformer 14 also obtains the input of the oscillating current that a power has been exaggerated simultaneously, so the secondary coil of boosting transformer 14 will export high-tension electricity.This high-tension electricity is sent to spark plug, just can carry out spark discharge ignition to motor.

When fire signal stops, 11 pin of SG3525A and 14 pin are followed immediately and are stopped exporting oscillating current.When next fire signal arrives, the work of circuit repeats again above process.Move in circles like this, just can continuously for engine high pressure spark discharge ignition provides high-tension electricity.

The explanation of other problems:

(1) R in spark energy setting or Circuit tuning 16 is set respectively ₈and R ₉the size of resistance; the 9 pin current potentials of SG3525A are made to be a certain fixed value when overvoltage crowbar 6 and overheating protection circuit 7 all do not work; just can set the dutycycle that 11 pin of SG3525A and 14 pin export square wave oscillation electric current, thus set the voltage of the high-tension electricity that this device exports and carried out the size of energy of sparkover by this high-tension electricity.

(2) if replace the R in spark energy setting or Circuit tuning 16 with a variable resistor ₈and R ₉and the centre cap of variable resistor is connected with 9 pin of SG3525A; all the other two ends are connected with ground with 16 pin of SG3525A respectively; so adjust the centre cap of this variable resistor; change the current potential of 9 pin when overvoltage crowbar 6 and overheating protection circuit 7 all do not work of SG3525A; just can adjust the dutycycle that 11 pin of SG3525A and 14 pin export square wave oscillation electric current, thus adjust the voltage of the high-tension electricity that this device exports within the specific limits and carried out the size of spark energy of sparkover by this high-tension electricity.

(3) in selection circuit during the parameter of components and parts; note spark energy setting or Circuit tuning 16, oscillating current output control circuit 13 and overheating protection circuit 7, the summation of electric current that time these three parts work simultaneously, institute consumes the 16 pin outputs of SG3525A does not exceed 50mA.Here, under the prerequisite ensureing circuit stability work, the current drain of these three parts should be reduced as far as possible.

(2) working procedure of auxiliary cicuit

At this, only describe the working procedure suppressing high pressure spike circuit 5, overvoltage crowbar 6 and overheating protection circuit 7.Other identical with the first embodiment or roughly the same, please refer to the first embodiment.

(1) the suppression high pressure spike circuit 5 of the present embodiment works like this: the process (identical with the first embodiment) that the first, RV has an effect.The second, penetrate into this device circuit inside because a variety of causes produces voltage spike, can VT be made ₅and VT ₆grid voltage raise, when this voltage is elevated to a certain value, ZD ₂and ZD ₃temporarily will be punctured conducting respectively, thus be made VT ₆and VT ₅the voltage of grid remains within a safety range.

(2) overvoltage crowbar 6 works like this: when the voltage inputting the present embodiment way circuit exceedes the voltage of our design, ZD ₁temporarily punctured, breakdown current flows through R ₆to ground, and make R ₆produce voltage drop.Work as R again ₆voltage drop more than VT ₄during the pressure drop (being about 0.7V) of base stage, VT ₄just start conducting, thus the current potential of 9 pin of SG3525A starts to decline.Again when 9 pin of SG3525A potential drop to a certain extent time, 11 pin of SG3525A and 14 pin just stop oscillation electric current export.So no matter whether oscillating current power amplification circuit 9 have fire signal input all can stop power stage at once, boosting transformer 14 also stops high-tension electricity exporting at once, and motor can not be lighted a fire.Other processes are analogous to embodiment 1.

(3) overheating protection circuit 7 works like this: the 5.1V reference potential of the 16 pin outputs of SG3525A is through RT, R ₆dividing potential drop, makes R ₆produce voltage drop, when temperature is raised, the resistance of RT along with reduction, R ₆voltage drop just increase.Work as R ₆voltage drop more than VT ₄during the voltage drop of base stage, VT ₄start conducting, thus the current potential of 9 pin of SG3525A starts to reduce.When 9 pin of SG3525A potential drop to a certain extent time, 11 pin of SG3525A and 14 pin just stop oscillation electric current export, so, no matter whether oscillating current power amplification circuit 9 have fire signal input all can stop power stage at once, the same high-tension electricity that at once stops of boosting transformer 14 exports, and motor can not be lighted a fire.Other processes are analogous to embodiment 1.

The explanation of other problems:

(1) small capacity ceramic capacitor C ₅be connected on VT ₄base stage and ground between, be stably work in order to ensure overvoltage crowbar 6 and overheating protection circuit 7.

(2) R is accessed in circuit ₇, object is ZD ₁and VT ₄base stage current limliting.

(3) R is accessed in circuit ₁₀, be then be ZD ₂and ZD ₃current limliting.

Above in each embodiment, the two ends of the secondary coil of boosting transformer 14, can make wherein one end ground connection, also can two ends all earth-free, specifically how, decide as required.

This primary of transformer input oscillating current formula engine ignitor, should carry out filling sealed with epoxy resin or other high dielectric materials, with the internal circuit preventing external substance from encroaching on this device, affect the normal work of this device.Particularly boosting transformer 14, must carry out filling sealed with epoxy resin or other high dielectric materials, to prevent high pressure electric leakage arcing.Wherein, fire signal transducer 10 and boosting transformer 14, can independently carry out filling sealed, so that maintain and replace, also can carry out filling sealed together with whole circuit, be beneficial to reduced volume.

Be enumerated above a specific embodiment of the present invention and three embodiments, and be illustrated this embodiment and three embodiments, at this, not meaning that scope of the present invention just limits is these.The present invention can also be implemented by other various forms, can carry out various omission without departing from the spirit and scope of the invention, substitute and change.And these modes implemented by other various forms and accommodation thereof are included in scope of the present invention and purport thereof, be included in too in invention described in claims and equivalent scope thereof.

Claims

1. a primary of transformer input oscillating current formula engine ignitor, is characterized in that being made up of main body circuit and auxiliary cicuit:

［ 1 ］ described main body circuit, it makes described primary of transformer input oscillating current formula engine ignitor and exports teasel root high-tension electricity along with the input of fire signal and stopping, comprising: the setting of accumulator (3), current oscillator (17), spark energy or Circuit tuning (16), fire signal transducer (10), fire signal input circlult (11), signal pulsewidth expand circuit (12), oscillating current output control circuit (13), oscillating current power amplification circuit (9) and boosting transformer (14);

accumulator (3) is by electrolytic condenser C ₂the small capacitor C good with high frequency characteristics ₃composition, electrolytic condenser C ₂with small capacitor C ₃after parallel connection, according to electrolytic condenser C ₂polarity one end be connected on diode D ₂after, the other end is connected with another electrode of input power and forms charge circuit;

current oscillator (17) is by resistor R ₉, capacitor C ₇form with the pin 8 of intergrated circuit UC3845, pin 4, resistor R ₉one end be connected with the pin 8 of intergrated circuit UC3845, the other end is then connected with the pin 4 of intergrated circuit UC3845, capacitor C ₇one end be connected with the pin 4 of intergrated circuit UC3845, the other end ground connection;

above resistor R ₉with capacitor C ₇form a spark energy setting or Circuit tuning (16) simultaneously;

by minitype iron core transformer T ₁as fire signal transducer (10), need the fire signal of conversion from minitype iron core transformer T ₁primary coil one end input, minitype iron core transformer T ₁the other end ground connection of primary coil, minitype iron core transformer T ₁secondary coil with the Same Name of Ends of primary coil grounding end and resistor R ₄lighting outlet be connected, minitype iron core transformer T ₁the other end ground connection of secondary coil;

by resistor R ₄with triode VT ₃composition fire signal input circlult (11), when needs conversion fire signal, resistor R ₄one end and miniature iron-core transformer T ₁being connected with the Same Name of Ends of the grounding end of primary coil of secondary coil, the other end and triode VT ₃base stage be connected, do not need conversion fire signal time, resistor R ₄one end be connected with fire signal, the other end and triode VT ₃base stage is connected, when needing the pulse width expanding fire signal, and triode VT ₃collector electrode be connected with the pin 2 of intergrated circuit NE555, triode VT ₃grounded-emitter connection, when not needing to expand the pulse width of fire signal, triode VT ₃collector electrode be connected with the pin 3 of intergrated circuit UC3845;

it is by resistor R that signal pulsewidth expands circuit (12) ₅, resistor R ₆, capacitor C ₅, capacitor C ₆with the monostable flipflop that intergrated circuit NE555 forms;

oscillating current output control circuit (13) is by resistor R ₇, diode D ₅, triode VT ₄, resistor R ₈form with the pin 3 of intergrated circuit UC3845, pin 8, pin 6, resistor R ₇with diode D ₅after series connection, one end is connected with the pin 3 of intergrated circuit NE555, the other end and triode VT ₄base stage be connected, diode D ₅connection be forward connect, triode VT ₄collector electrode be connected with the pin 3 of intergrated circuit UC3845, triode VT ₄grounded-emitter connection, resistor R ₈one end be connected with the pin 3 of intergrated circuit UC3845, the other end is connected with the pin 8 of intergrated circuit UC3845, do not have signal pulsewidth expand circuit (12) time, resistor R ₇, diode D ₅with triode VT ₄do not install;

oscillating current power amplification circuit (9) is by pin 6, the resistor R of intergrated circuit UC3845 ₁₀, field effect transistor VT ₆with boosting transformer T ₂primary coil composition, resistor R ₁₀one end be connected with the pin 6 of intergrated circuit UC3845, the other end and field effect transistor VT ₆grid be connected, field effect transistor VT ₆drain electrode and boosting transformer T ₂wherein one end be connected, field effect transistor VT ₆source ground;

one end of primary coil of boosting transformer (14) and field effect transistor VT ₆drain electrode be connected, the other end is connected with the positive pole of accumulator (3), and the output of the secondary coil of boosting transformer (14) is lighted a fire high-tension electricity;

［ 2 ］ described auxiliary cicuit, comprising: insurance circuit (1), electric power polarity wiring error protective circuit (2), energy dissipating circuit (4), suppression high pressure spike circuit (5), overvoltage crowbar (6), overheating protection circuit (7), prevention electromagnetic interference circuit (15) and fire signal input end wiring error protective circuit (8);

connect fus FU as insurance circuit (1) at the input end of power supply;

the diode D that a forward of connecting again after fus FU connects ₂form electric power polarity wiring error protective circuit (2);

energy dissipating circuit (4) is by diode D ₁, diode D ₂, diode D ₃, resistor R ₁, resistor R ₂, resistor R ₃, triode VT ₁, triode VT ₂with capacitor C ₁composition, wherein diode D ₁, resistor R ₁with triode VT ₁base stage be connected in series sequentially form VT ₁base circuit, by resistor R ₂, diode D ₃with triode VT ₂base stage be connected in series sequentially and form triode VT ₂base circuit, triode VT ₁collector electrode and resistor R ₂with diode D ₃between line be connected, resistor R ₃one end and triode VT ₂collector electrode be connected, resistor R ₃the other end and resistor R ₂not connection diode D ₃that one end be connected after, the diode D be connected with forward ₂be connected in series in the positive pole of accumulator (3), capacitor C ₁one end and diode D ₁with resistor R ₁line connect, capacitor C ₁the other end ground connection, triode VT ₁the input end of base circuit and triode VT ₂base circuit input end between connect diode D ₂, triode VT ₁with triode VT ₂emitter be all ground connection;

suppress high pressure spike circuit (5) by piezoresistance RV, reference diode ZD ₂composition, an end of piezoresistance RV is connected between the power positive cathode after fus FU, reference diode ZD ₂reversal connection scene effect pipe VT ₆grid and ground between;

overvoltage crowbar (6) is by reference diode ZD ₁, resistor R ₁₁, resistor R ₁₂, capacitor C ₈, triode VT ₅form with the pin 1 of intergrated circuit UC3845, reference diode ZD ₁opposite direction connection, resistor R ₁₁with reference diode ZD ₁after series connection, an end is connected on triode VT ₅base stage on, the positive pole of another termination accumulator, resistor R ₁₂with capacitor C ₈one end connecting triode VT after in parallel ₅base stage, the other end ground connection, triode VT ₅grounded-emitter connection, triode VT ₅collector electrode be connected with the pin 1 of intergrated circuit UC3845;

overheating protection circuit (7) is by resistor R ₁₂, capacitor C ₈, triode VT ₅, the pin 8 of negative tempperature coefficient thermistor RT and intergrated circuit UC3845, pin 1 form, the pin 8 of a termination intergrated circuit UC3845 of negative tempperature coefficient thermistor RT, another termination triode VT ₅base stage, resistor R ₁₂with capacitor C ₈one end connecting triode VT after in parallel ₅base stage, the other end ground connection, triode VT ₅grounded-emitter connection, triode VT ₅collector electrode be connected with the pin 1 of intergrated circuit UC3845;

prevention electromagnetic interference circuit (15) is by the good small capacitor C of a high frequency characteristics ₄one end is connected on triode VT ₃base stage, the other end ground connection form;

fire signal input end wiring error protective circuit (8) is by resistor R ₄, diode D ₄composition, diode D ₄with triode VT ₃the in parallel and diode D of base stage ₄opposite direction connection, or diode D ₄with triode VT ₃base series and diode D ₄forward connects.

2. primary of transformer input oscillating current formula engine ignitor according to claim 1, is characterized in that:

Described fire signal transducer (10) is just installed when needs conversion fire signal, otherwise does not install; Described signal pulsewidth expands circuit (12) and just installs when the pulse width of fire signal can not meet the needs of spark duration and will expand the pulse width of fire signal, otherwise does not install.

3. primary of transformer input oscillating current formula engine ignitor according to claim 1, is characterized in that:

Except external lead wire and insurance circuit (1), the circuit insulating material of whole device is filling sealed, wherein, and fire signal transducer (10) and boosting transformer (14), independently use insulating material filling sealed, or whole circuit one to reinstate insulating material filling sealed.