CN109617415A - A kind of signal-isolated transmission circuit - Google Patents
A kind of signal-isolated transmission circuit Download PDFInfo
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- CN109617415A CN109617415A CN201811501982.7A CN201811501982A CN109617415A CN 109617415 A CN109617415 A CN 109617415A CN 201811501982 A CN201811501982 A CN 201811501982A CN 109617415 A CN109617415 A CN 109617415A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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Abstract
The present invention provides a kind of signal-isolated transmission circuit, including signal chopper circuit, for direct-flow input signal copped wave；Signal coupling transformer, for direct-flow input signal of the isolation coupling after copped wave；Signals revivification circuit, for restoring output direct-flow output signal；Signal control signal chopper circuit is controlled by external complementary pulse, realize the copped wave of input direct-current signal, secondary side ac voltage signal, to secondary side, is reduced to d. c. voltage signal by coupling transformer vice-side winding alternating drive signal also primary circuit by signal coupling transformer linear transfer by the signal after copped wave.This circuit is not required to additionally increase reduction circuit control signal isolation design, can enormously simplify design complexities, reduce cost.
Description
Technical field
The present invention relates to signal isolation transmitter in industrial measurement and control industry, in particular to a kind of analog quantity direct current non-zero voltage
Signal-isolated transmission circuit.
Background technique
In industrial measurement and control industry, application one of of the signal isolation transmitter as current signal isolation, in Patent No.
ZL200910038270.0, publication date are on September 9th, 2009, a kind of entitled " side of DC bipolar signal isolation conversion
Method and its circuit " a kind of patent document isolation and conversion method disclosed herein and its circuit, as shown in Figure 1, its isolation transmission electricity
Road includes the first bidirectional switch circuit, clock circuit, coupling transformer, the second bidirectional switch circuit.
Its circuit structure are as follows: the primary side winding of isolation coupling transformer and the first bidirection switching device are linked to be input circuit,
The normal-closed end of first bidirection switching device and normally open end are separately connected the both ends of first winding, and direct-current positive/negative input signal connects
Connect the centre tap of first winding, the reference of the common end connection direct-current positive/negative input signal of the first bidirection switching device
End；The vice-side winding of isolation coupling transformer and the second bidirection switching device are linked to be output loop, the second bidirection switching device
Normal-closed end and normally open end are separately connected the both ends of vice-side winding, and the centre tap connection direct-current positive/negative signal of vice-side winding is defeated
Outlet, the reference end of the common end connection direct-current positive/negative output signal of the second bidirection switching device；Lock-out pulse hair is isolated
The two-way output of raw circuit is separately connected the drive control end of two bidirection switching devices.
Fig. 2 is the application scenario diagram of existing actual circuit, including isolation coupling transformer T2, by metal-oxide-semiconductor Q300 and Q301
Constitute the first bidirection switching device, have metal-oxide-semiconductor Q400 and Q401 constitute the second bidirection switching device, by capacitor C301~
The incoming sync pulse circuit that C304, resistance R301, R302 are constituted, is made of capacitor C401~C404, resistance R401, R402
Export clock circuit.
Its working principle summary are as follows: d. c. voltage signal inputs the primary side winding of isolation coupling transformer T2, in synchronous arteries and veins
It rushes under circuit control, two switches of the first bidirection switching device work alternatively, and electric current alternately flows through in primary side winding, complete
Excitation and demagnetization process.Induced current is also alternately generated in vice-side winding, then under clock circuit control, second
Bidirection switching device is open-minded, completes signals revivification, the alternating voltage on transformer is converted to direct voltage output.
Its feature are as follows: direct-flow input signal is carried out using the synchronous pulse control signal in former and deputy side and switching circuit
Copped wave, then signal-isolated transmission is carried out by coupling transformer.
Its key problem in technology point is to provide the switching circuit on the former pair side of coupling transformer a synchronous external control letter
It number could complete AC signal reduction.Therefore the additional isolation transmission control circuit design for increasing synchronized signal is needed, such as
Cost, volume, the design complexities of this corresponding product will greatly increase, and also therefore hinder this technology in high frequency, corpusculum
Further development in product, low cost.
The present invention is based on this to be designed.
Summary of the invention
It is an object of that present invention to provide a kind of signal-isolated transmission circuit, this circuit is not required to additionally increase control signal isolation
Transmission control circuit design, can enormously simplify design complexities, reduce cost.
The purpose of the present invention can be realized by following scheme:
A kind of signal-isolated transmission circuit, including signal chopper circuit, for direct-flow input signal copped wave；Signal coupling
Transformer, for direct-flow input signal of the isolation coupling after copped wave；Signals revivification circuit, for restoring output direct current output
Signal；
Wherein the primary side winding of signal coupling transformer and signal chopper circuit are linked to be input circuit, signal chopper circuit
Two drive outputs are separately connected the both ends of primary side winding, and direct-flow input signal connects the centre tap of first winding, and signal is cut
The reference end of the common end connection direct-flow input signal of wave circuit；
The vice-side winding and signals revivification circuit of signal coupling circuit are linked to be output loop, two drivings of signals revivification circuit
Input terminal is separately connected the both ends of vice-side winding, the centre tap of the output loop connection vice-side winding of signals revivification circuit, letter
Number go back the reference end of the common end connection direct-flow output signal of primary circuit；
Signal control signal chopper circuit is controlled by external complementary pulse, the copped wave of input direct-current signal is realized, after copped wave
Signal by signal coupling transformer linear transfer to secondary side, pass through coupling transformer vice-side winding alternating drive signal and restore
Secondary side AC signal is reduced to direct current signal by circuit.
Preferably, the signal chopper circuit, including metal-oxide-semiconductor TR1, metal-oxide-semiconductor TR2 and driving circuit；Metal-oxide-semiconductor TR1 leakage
Pole connects the Same Name of Ends of transformer primary winding, the different name end of metal-oxide-semiconductor TR2 drain electrode connection transformer primary winding, metal-oxide-semiconductor TR1
Grid connection signal driving circuit first exports, and metal-oxide-semiconductor TR2 grid connection signal driving circuit second exports, the source metal-oxide-semiconductor TR1
Pole connects metal-oxide-semiconductor TR2 source electrode, this tie point is the common end of signal chopper circuit, and the input of control circuit first is outer for receiving
The first pulse control signal of portion, the output of control circuit the 2nd 1 is for receiving external second pulse control signal, external first arteries and veins
Punching control signal is a pair of complementary pulse signal with external second pulse control signal.
Preferably, the signal drive circuit includes resistance R1~resistance R4, capacitor C2, capacitor C3, diode D1, two
Pole pipe D2, external first pulse control signal in the one end capacitor C2, the capacitor C2 other end connect the one end resistance R1, the one end resistance R2,
Diode D1 cathode, the resistance R2 other end is connected with diode D1 anode to be exported as control circuit first, the resistance R1 other end
It connects with the one end resistance R3, and connects the reference end of direct-flow input signal simultaneously, the external second pulse control letter in the one end capacitor C3
Number, the capacitor C3 other end connects the resistance R3 other end, the one end resistance R4, diode D2 cathode, the resistance R4 other end and diode
D2 anode is connected, and exports as signal drive circuit second.
Preferably, the signals revivification circuit, including metal-oxide-semiconductor TR1A, metal-oxide-semiconductor TR2A, metal-oxide-semiconductor driving circuit and whole
Current circuit；The Same Name of Ends of metal-oxide-semiconductor TR1A drain electrode connection transformer secondary winding, metal-oxide-semiconductor TR1A grid connect metal-oxide-semiconductor driving circuit
First output, metal-oxide-semiconductor TR2A drain electrode connection transformer secondary winding different name end, metal-oxide-semiconductor TR2A grid connect metal-oxide-semiconductor driving
The source electrode of second output of circuit, metal-oxide-semiconductor TR1A and metal-oxide-semiconductor TR2A connect the reference end of direct-flow output signal simultaneously, and metal-oxide-semiconductor drives
The Same Name of Ends of first input connection transformer secondary winding of dynamic circuit, the input connection transformer pair of metal-oxide-semiconductor driving circuit second
The different name end of side winding, output loop of the rectification circuit as signals revivification circuit, input terminal connect transformer secondary winding
Centre tap, rectification circuit output end is as direct-flow output signal output end.
Preferably, the metal-oxide-semiconductor driving circuit, including resistance R1A~resistance R4A, capacitor C2A, capacitor C3A, capacitor
C4A, diode D1A, diode D2A, the one end capacitor C2A connect the Same Name of Ends of transformer secondary winding, and the capacitor C2A other end connects
The one end connecting resistance R1A, the one end resistance R2A, the one end diode D1A, the resistance R1A other end connect the reference of direct-flow output signal
End, the resistance R2A other end connect diode D1A anode, this tie point is exported as metal-oxide-semiconductor driving circuit second, capacitor C3A mono-
The different name end of end connection transformer secondary winding, the other end of capacitor C3A connect the one end resistance R3A, the one end resistance R4A, two poles
Pipe D2A cathode, the resistance R3A other end connect the reference end of direct-flow output signal, and the resistance R4A other end connects diode D2A sun
Pole, first output of this tie point as metal-oxide-semiconductor driving circuit.
Preferably, the signals revivification circuit, including metal-oxide-semiconductor TR2A, metal-oxide-semiconductor driving circuit and rectification circuit, metal-oxide-semiconductor
The different name end of TR2A drain electrode connection transformer secondary winding, metal-oxide-semiconductor TR2A source electrode connect the reference end of direct-flow output signal, TR2A
Grid connects the output end of metal-oxide-semiconductor driving circuit, the Same Name of Ends of the input connection vice-side winding of metal-oxide-semiconductor driving circuit first, metal-oxide-semiconductor
The different name end of the output connection transformer secondary winding of driving circuit second, rectification circuit is the output loop of signals revivification circuit,
Its input terminal connects the centre tap of transformer secondary winding, and filter capacitor output end is the output end of direct-flow output signal.
Preferably, metal-oxide-semiconductor driving circuit includes resistance R1A~resistance R13A, capacitor C2A, capacitor C3A, diode D1A,
The one end capacitor C2A connects the Same Name of Ends of transformer secondary winding, and the capacitor C2A other end connects the one end resistance R1A, resistance R2A mono-
End, diode D1A cathode, the resistance R1A other end connect the reference end of DC signal output signal, the connection of the resistance R2A other end
Diode D1A anode, this tie point are the output end of metal-oxide-semiconductor driving circuit；The one end capacitor C3A connects transformer secondary winding
Different name end, the capacitor C3A other end are connected to the reference end of direct-flow output signal after connecting with resistance R3A.
Preferably, the rectification circuit is made of resistance R15, capacitor C1A, the one end resistance R15 and transformer secondary around
The centre tap of group is connected, and the resistance R15 other end is connected with the one end capacitor C1A, and the output end as direct-flow output signal, electricity
Hold the reference end of C1A other end connection direct-flow output signal.
Preferably, the voltage value of direct-flow input signal is greater than metal-oxide-semiconductor TR1A and metal-oxide-semiconductor TR2A grid in signals revivification circuit
Cut-in voltage.
The working principle of the invention is described as follows:
Assuming that in a complementary pulse control signal period, in the first half cycle of pulse control signal, chopper circuit
Metal-oxide-semiconductor TR1 is open-minded, and metal-oxide-semiconductor TR2 shutdown, in the later half period of pulse control signal, metal-oxide-semiconductor TR1 is turned off in chopper circuit, MOS
Pipe TR2 is open-minded；Be respectively provided with centre tap on transformer primary vice-side winding, the Same Name of Ends and centre tap of transformer primary winding it
Between may be regarded as transformer first and input winding, may be regarded as transformer the between the centre tap and different name end of transformer primary winding
Two input windings, may be regarded as transformer first and export winding, transformation between the Same Name of Ends and centre tap of transformer secondary winding
It may be regarded as transformer second between the centre tap and different name end of device vice-side winding and export winding；
Direct-flow input signal U1 is inputted after input capacitance C1 filtering by the centre cap of transformer primary winding,
In the first half cycle of pulse control signal, under the action of direct-flow input signal U1, transformer first inputs winding and starts excitation,
Transformer establishes magnetic field.At this point, exporting winding in transformer second can generate under the relationship satisfaction of induced electromotive force U2, U1 and U2
Formula:
Wherein N1, N2 be transformer primary, vice-side winding the number of turns,
Induced electromotive force U2 by capacitance C3A and with reference to after ground resistance R3A, peak-to-peak value about ±
0.5U2, and be transmitted to metal-oxide-semiconductor TR1A grid and driving voltage is provided, when driving voltage is greater than TR1A gate turn-on voltage, MOS
Pipe TR1A is open-minded, and metal-oxide-semiconductor TR2A is in an off state at this time, and transformer first exports winding by resistance R15 to filter capacitor
C1A charges, until capacitance voltage Uc is equal to U2；
In the later half period of pulse control signal, the metal-oxide-semiconductor TR2 of signal chopper circuit is open-minded, and metal-oxide-semiconductor TR1 shutdown then becomes
The input winding of depressor second is open-minded, carries out inverse-exciting, the first output winding to transformer under direct-flow input signal U1 ' effect
Generation induced electromotive force is U3, and U3 value is equal to U1 ' and passes through capacitance C2A, Yi Jican after induced electromotive force U3 is established
After examining ground resistance R1A, the peak-to-peak value of induced electromotive force U3 is ± 0.5U3, and provides driving electricity for metal-oxide-semiconductor TR2A grid
Pressure, when driving voltage is greater than TR2A gate turn-on voltage, metal-oxide-semiconductor TR2A is open-minded, simultaneously, metal-oxide-semiconductor TR1A grid voltage
It is discharged by diode D2A, so that metal-oxide-semiconductor TR1A is turned off, in the later half period, winding will be exported by transformer second and pass through resistance
R15 charges to filter capacitor C1A；Due to the presence of current-limiting resistance R2A in circuit, so that metal-oxide-semiconductor TR2A, which is opened, can postpone in MOS
Pipe TR1A shutdown, so can be avoided metal-oxide-semiconductor TR1A and metal-oxide-semiconductor TR2A and is connected jointly.At this time in the later half of pulse control signal
An of short duration section will be present in period, i.e., metal-oxide-semiconductor TR2A is not completely open-minded, and metal-oxide-semiconductor TR1A is not complete switched off, rectification circuit
Middle capacitor C1A can export winding to transformer second and carry out reverse charging, but due in rectification circuit filter resistance R15 deposit
Playing the role of a current limliting, its transformer second is made to export winding reverse charging current maxima Io=U2/
Rc avoids the fluctuation of output filter capacitor voltage.
After metal-oxide-semiconductor TR2A is opened completely, transformer second exports winding and then passes through filter resistance R15 to filter capacitor
C1A charges, until capacitance voltage Uc=U3；Until pulse control signal enters next control period, so replaced
Circulation, so far copped wave AC signal is reduced to direct current signal, realizes the high-precision isolation transmission of direct-flow input signal, meets
It is noted that under conditions of must satisfy Vin greater than metal-oxide-semiconductor TR1A, metal-oxide-semiconductor TR2A gate turn-on voltage, ability
Realize linearly reduction.This condition is also the qualifications of the minimum value of this circuit input signal.
Compared with the prior art, the advantages of the present invention are as follows it is outer without providing that circuit realizes the circuit in signals revivification
The rectification driving signal in portion, therefore additional increased control signal-isolated transmission control circuit design is also eliminated, it greatly simplifies
Design complexities, improve the reliability of product design, while making that the circuit is simpler, volume is smaller, be readily produced reality
It applies, is at low cost.
Detailed description of the invention
Fig. 1 is existing signal-isolated transmission circuit application circuit functional block diagram；
Fig. 2 is existing signal-isolated transmission circuit application circuit schematic diagram；
Fig. 3 is signal-isolated transmission schematic block circuit diagram of the present invention；
Fig. 4 is signal-isolated transmission circuit first embodiment schematic diagram of the present invention；
Fig. 5 is signal-isolated transmission circuit second embodiment schematic diagram of the present invention.
Specific embodiment
Fig. 3 is the schematic block circuit diagram of signal-isolated transmission circuit of the present invention, a kind of signal-isolated transmission circuit, including letter
Number chopper circuit, for direct-flow input signal copped wave；Signal coupling transformer, for direct current of the isolation coupling after copped wave
Input signal；Signals revivification circuit, for restoring output direct-flow output signal；
Wherein the primary side winding of signal coupling transformer and signal chopper circuit are linked to be input circuit, signal chopper circuit
Two drive outputs are separately connected the both ends of primary side winding, and direct-flow input signal connects the centre tap of first winding, and signal is cut
The reference end of the common end connection direct-flow input signal of wave circuit；
The vice-side winding and signals revivification circuit of signal coupling circuit are linked to be output loop, two drivings of signals revivification circuit
Input terminal is separately connected the both ends of vice-side winding, the centre tap of the output loop connection vice-side winding of signals revivification circuit, letter
Number go back the reference end of the common end connection direct-flow output signal of primary circuit；
Signal control signal chopper circuit is controlled by external complementary pulse, the copped wave of input direct-current signal is realized, after copped wave
Signal by signal coupling transformer linear transfer to secondary side, pass through coupling transformer vice-side winding alternating drive signal and restore
Secondary side AC signal is reduced to direct current signal by circuit.
In order to be best understood from the present invention, below will using specific embodiment to signal-isolated transmission circuit of the invention into one
Step is illustrated.
First embodiment
Fig. 4 is the circuit diagram of first embodiment of the invention, as shown, being in compared with the difference in background technique Fig. 2
In: in the application of background technique, transformer secondary must provide the isolation lock-out pulse synchronous with primary side modulated drive signal,
Transformer secondary winding generates driving signal control and goes back primary circuit in application circuit of the invention, realizes synchronous rectification, is not required to again
Transformer secondary adds pulse regulation.
Each circuit structure of the present embodiment are as follows:
Signal chopper circuit: including metal-oxide-semiconductor TR1, metal-oxide-semiconductor TR2, driving circuit: including resistance R1~resistance R4, capacitor
C2, capacitor C3, diode D1, diode D2；
Signal coupling transformer: including primary side winding and vice-side winding, centre tap, transformation are respectively provided on former vice-side winding
1 foot of device is the Same Name of Ends of primary side winding, and 2 foot of transformer is the centre tap of primary side winding, and 3 foot of transformer is the different of primary side winding
Name end, 4 foot of transformer are the different name end of vice-side winding, and 5 foot of transformer is the centre tap of vice-side winding, and 6 foot of transformer is pair
The Same Name of Ends of side winding；It is considered as transformer first between 1 foot of transformer and 2 feet and inputs winding, is regarded between 2 foot of transformer and 3 feet
Winding is inputted for transformer second, is considered as transformer second between 4 foot of transformer and 5 feet and exports winding, 5 foot of transformer and 6 feet
Between be considered as transformer first export winding；
Signals revivification circuit: including metal-oxide-semiconductor TR1A, metal-oxide-semiconductor TR2A, metal-oxide-semiconductor driving circuit: including resistance R1A~resistance
R4A, capacitor C2A, capacitor C3A, diode D1A, diode D2A；Rectification circuit: including resistance R15, capacitor C1A.
Each circuit connecting relation are as follows: direct-flow input signal connects 2 foot of transformer, and 1 foot of transformer connects metal-oxide-semiconductor TR1 drain electrode,
Metal-oxide-semiconductor TR1 source electrode connect metal-oxide-semiconductor TR2 source electrode, this tie point connect direct-flow input signal reference end, metal-oxide-semiconductor TR1 grid according to
It is secondary to pick out the first pulse control signal of connection through resistance R2, capacitor C2；Diode D1 anode connects metal-oxide-semiconductor grid and resistance R2's
Tie point, diode D1 cathode connect the tie point of resistance R2 and capacitor C2, also while connecting the one end resistance R1, resistance R1 is another
End is connect with the one end resistance R3, this tie point connects the reference end of direct-flow input signal；Metal-oxide-semiconductor TR2 drain electrode connection transformer 3
Foot, metal-oxide-semiconductor TR2 grid successively pick out the second pulse control signal of connection, the connection of diode D2 anode through resistance R4, capacitor C3
The tie point of metal-oxide-semiconductor TR2 grid and resistance R4, diode D2 cathode connect the tie point of resistance R4 and capacitor C3, this tie point
Connect the resistance R3 other end；4 foot of transformer connects the one end capacitor C3A, metal-oxide-semiconductor TR2A drain electrode, and the capacitor C3A other end is through resistance
The reference end of direct-flow output signal, the reference end of the source electrode connection direct-flow output signal of metal-oxide-semiconductor TR2A, resistance are connected to after R3A
The one end R4A is connect with diode D2A cathode, this tie point connects the tie point of capacitor C3A and resistance R3A, the resistance R4A other end
It is connect with diode D2A anode, and is connected to metal-oxide-semiconductor TR1 grid simultaneously；5 foot of transformer is connected to direct current output through resistance R15
The output end of signal, the one end capacitor C1A connect the output end of direct-flow output signal, and the capacitor C1A other end connects direct current output letter
Number reference end；6 foot of transformer connects the one end capacitor C2A, metal-oxide-semiconductor TR1A drain electrode, and metal-oxide-semiconductor TR1A source electrode connects direct current output letter
Number reference end, the capacitor C2A other end is connected to the reference end of direct-flow output signal through resistance R1A, the one end resistance R2A and two poles
The connection of pipe D1A cathode, and it is connected to the tie point of capacitor C2A Yu resistance R1A simultaneously, the resistance R2A other end and diode D1A sun
Pole connection, and it is connected to metal-oxide-semiconductor TR2A grid simultaneously.
It should be noted that this implementation must meet input direct-current signal greater than metal-oxide-semiconductor TR1A, metal-oxide-semiconductor TR2A grid
It works under conditions of cut-in voltage, input direct-current signal U1 is inputted by 2 foot of transformer, and a pair of of complementary drive control signal passes through letter
Two inputs of number driving circuit are realized to open metal-oxide-semiconductor TR1, metal-oxide-semiconductor TR2 and be controlled with turning off, and realize cutting for direct-flow input signal
Wave, wherein the effect of signal drive circuit is that metal-oxide-semiconductor TR1, metal-oxide-semiconductor TR2 is enable to rapidly switch off, and avoids the occurrence of the two while opening
Logical phenomenon, at the same make metal-oxide-semiconductor TR1A, metal-oxide-semiconductor TR2A open delay when driving signal, shutdown as far as possible keep and driving signal
Synchronous, the resistance R15 in rectification circuit simultaneously turns off period and secondary side in metal-oxide-semiconductor TR1, metal-oxide-semiconductor TR2 for limiting capacitance C1A
The amplitude of the high-frequency resonant noise of winding.
Based on the working principle in technical solution, the working principle of the signals revivification circuit of the present embodiment is carried out again into one
Step is specifically described: specific as schemed, direct-flow input signal U1 after chopping modulation by transformer primary side by being transmitted energy to
Secondary side, in the first half cycle in a driving control signal period, metal-oxide-semiconductor TR1 is opened, metal-oxide-semiconductor TR2 is turned off, then transformer first
Input winding output winding voltage and be equal to U1, polarity be it is upper it is negative under just, it is assumed that the turn ratio of transformer primary vice-side winding is 1, at this time
Transformer first exports induction winding voltage on winding and is equal to U1, polarity be it is upper it is negative under just, meanwhile, the output of transformer second around
The winding voltage of group induction is also equal to U1, and polarity is just, the winding voltage of the winding of the output of transformer second at this time is logical under upper bear
It crosses capacitor C3A, resistance R4A to charge to the input capacitance Ciss of metal-oxide-semiconductor TR1A, when charging voltage rises to metal-oxide-semiconductor TR1A grid
When cut-in voltage, metal-oxide-semiconductor TR1A is open-minded, exports winding output by transformer first at this time, and by resistance R15 to capacitor C1A
It charges, until voltage value Uc is equal to U1 on capacitor CA1；
In the later half period within the driving control signal period, metal-oxide-semiconductor TR2 is opened, metal-oxide-semiconductor TR1 is turned off, direct-flow input signal
U1 ' is inputted from 2 foot of transformer, and transformer second inputs winding conducting, and transformer second inputs winding and exports winding voltage at this time
Equal to U1 ', polarity is upper just lower negative；Transformer first exports winding and senses the winding voltage equal to U1 ', polarity at this time
To be upper just lower negative, transformer second exports winding and also senses that the winding voltage equal to U1 ', memory are upper just lower negative.At this time
Transformer first exports input capacitance Ciss of the winding voltage of winding reaction by capacitor C2A, resistance R2A to metal-oxide-semiconductor TR2A
Charging, when charging voltage rises to metal-oxide-semiconductor TR2A gate turn-on voltage, metal-oxide-semiconductor TR2A is open-minded, defeated by transformer second at this time
Winding exports out, is charged capacitor C1A until the voltage Uc on capacitor C1A is equal to U1 ' by resistance R15.
Within a pulse control signal period, friendship that the driven transformer primary winding of signals revivification circuit transmits
Signal is flowed, so constantly circulation driving modulation, the reduction until completing ac input signal.
Second embodiment
Fig. 5 is second embodiment, as shown, being different from the first embodiment in, signals revivification circuit includes MOS
Pipe TR2A, metal-oxide-semiconductor driving circuit: including resistance R1A~resistance R3A, capacitor C2A, capacitor C3A, diode R1A, rectification circuit:
Including resistance R15, capacitor C1A；
Its connection relationship are as follows: 6 foot of transformer successively passes through capacitor C2A, resistance R1A is connected to the reference of direct-flow output signal
End, the one end resistance R2A is connect with diode D1A cathode, and connects the tie point of capacitor C2A Yu resistance R1A, and resistance R2A is another
End is connect with diode D1A anode, and connects metal-oxide-semiconductor TR2A grid, metal-oxide-semiconductor TR2A drain electrode connection 4 foot of transformer, metal-oxide-semiconductor
TR2A source electrode connects the reference end of direct-flow output signal, and capacitor C3A is connected in parallel on the drain electrode of metal-oxide-semiconductor TR2A after connecting with resistance R3A
Between source electrode, the one end resistance R15 connects 5 foot of transformer, and the resistance R15 other end connects the one end capacitor C1A, and defeated as direct current
The output end of signal out, the capacitor C1A other end connect the reference end of direct-flow output signal.
In the present embodiment, within a pulse control signal period, drive is only passed through by secondary the second winding of side in the later half period
Dynamic circuit realizes the control to the second winding metal-oxide-semiconductor TR2A to realize signals revivification, is different from the first embodiment and is: first is real
It applies example and realizes that alternately signal drives twice using transformer secondary winding within a pulse control signal period, and the present embodiment
Within a pulse control signal period, only carry out the driving of signal and realize signals revivification, and the working principle for this implementations and
First embodiment is roughly the same, is not repeated.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, protection scope of the present invention should be defined by the scope defined by the claims..For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (9)
1. a kind of signal-isolated transmission circuit, it is characterised in that: including signal chopper circuit, for being cut to direct-flow input signal
Wave；Signal coupling transformer, for direct-flow input signal of the isolation coupling after copped wave；Signals revivification circuit, for restoring
Export direct current signal；
Wherein the primary side winding of signal coupling transformer and signal chopper circuit constitute input circuit, two drives of signal chopper circuit
Dynamic output end is separately connected the both ends of primary side winding, and direct-flow input signal connects the centre tap of first winding, signal copped wave electricity
The reference end of the common end connection direct-flow input signal on road；
The vice-side winding and signals revivification circuit of signal coupling transformer constitute output loop, and two drivings of signals revivification circuit are defeated
Enter the both ends that end is separately connected vice-side winding, the centre tap of the output loop connection vice-side winding of signals revivification circuit, signal
The also reference end of the common end connection direct-flow output signal of primary circuit；
Signal control signal chopper circuit, which is controlled, by external complementary pulse realizes the copped wave of input direct-current signal, the signal after copped wave
Electricity is restored by signal coupling transformer linear transfer to secondary side, and by the vice-side winding alternating drive signal of coupling transformer
Secondary side AC signal is reduced to direct current signal by road.
2. signal-isolated transmission circuit according to claim 1, it is characterised in that: the signal chopper circuit, including
Metal-oxide-semiconductor TR1, metal-oxide-semiconductor TR2 and signal drive circuit；The Same Name of Ends of metal-oxide-semiconductor TR1 drain electrode connection transformer primary winding, metal-oxide-semiconductor
The different name end of TR2 drain electrode connection transformer primary winding, metal-oxide-semiconductor TR1 grid connection signal driving circuit first export, metal-oxide-semiconductor
TR2 grid connection signal driving circuit second exports, and metal-oxide-semiconductor TR1 source electrode connects metal-oxide-semiconductor TR2 source electrode, this tie point is cut for signal
The common end of wave circuit, one input terminal of signal drive circuit connect external first pulse control signal, and signal drive circuit is another
Input terminal connects external second pulse control signal, and external first pulse control signal and external second pulse control signal are one
To complementary pulse signal.
3. signal-isolated transmission circuit according to claim 2, it is characterised in that: the signal drive circuit includes electricity
Resistance R1~resistance R4, capacitor C2, capacitor C3, diode D1, diode D2, external first pulse control signal in the one end capacitor C2,
The capacitor C2 other end connects the one end resistance R1, the one end resistance R2, diode D1 cathode, the resistance R2 other end and diode D1 anode
It is connected, is exported as signal drive circuit first, the resistance R1 other end is connected with the one end resistance R3, and connects direct current input simultaneously
The reference end of signal, external second pulse control signal in the one end capacitor C3, the capacitor C3 other end connect the resistance R3 other end, resistance
The one end R4, diode D2 cathode, the resistance R4 other end are connected with diode D2 anode, export as signal drive circuit second.
4. signal-isolated transmission circuit according to claim 1, it is characterised in that: the signals revivification circuit includes
Metal-oxide-semiconductor TR1A, metal-oxide-semiconductor TR2A, metal-oxide-semiconductor driving circuit and rectification circuit；Metal-oxide-semiconductor TR1A drain electrode connection transformer secondary winding
Same Name of Ends, metal-oxide-semiconductor TR1A grid connect the first output end of metal-oxide-semiconductor driving circuit, metal-oxide-semiconductor TR2A drain electrode connection transformer secondary
The different name end of winding, metal-oxide-semiconductor TR2A grid connect the second output terminal of metal-oxide-semiconductor driving circuit, metal-oxide-semiconductor TR1A and metal-oxide-semiconductor TR2A
Source electrode connect the reference end of direct-flow output signal, the first input connection transformer secondary winding of metal-oxide-semiconductor driving circuit simultaneously
Same Name of Ends, metal-oxide-semiconductor driving circuit second input connection transformer secondary winding different name end, rectification circuit as signal also
The output loop of primary circuit, input terminal connect the centre tap of transformer secondary winding, and rectification circuit output end is as direct current
The output end of output signal.
5. signal-isolated transmission circuit according to claim 4, it is characterised in that: the metal-oxide-semiconductor driving circuit, including
Resistance R1A~resistance R4A, capacitor C2A, capacitor C3A, capacitor C4A, diode D1A, diode D2A, the connection of the one end capacitor C2A
The Same Name of Ends of transformer secondary winding, the capacitor C2A other end connect the one end resistance R1A, the one end resistance R2A, diode D1A mono-
End, the resistance R1A other end connect the reference end of direct-flow output signal, and the resistance R2A other end connects diode D1A anode, this company
Second output of the contact as metal-oxide-semiconductor driving circuit, the one end capacitor C3A connects the different name end of transformer secondary winding, capacitor C3A
The other end connect the one end resistance R3A, the one end resistance R4A, diode D2A cathode, the resistance R3A other end connect direct current output letter
Number reference end, the resistance R4A other end connects diode D2A anode, this tie point is first defeated as metal-oxide-semiconductor driving circuit
Out.
6. signal-isolated transmission circuit according to claim 1, it is characterised in that: the signals revivification circuit, including
Metal-oxide-semiconductor TR2A, metal-oxide-semiconductor driving circuit and rectification circuit, the different name end of metal-oxide-semiconductor TR2A drain electrode connection transformer secondary winding, MOS
Pipe TR2A source electrode connects the reference end of direct-flow output signal, and TR2A grid connects the output end of metal-oxide-semiconductor driving circuit, and metal-oxide-semiconductor drives
The Same Name of Ends of the dynamic input of circuit first connection transformer secondary winding, the input connection transformer secondary of metal-oxide-semiconductor driving circuit second
The different name end of winding, rectification circuit are the output loop of signals revivification circuit, and input terminal connects in transformer secondary winding
Between tap, filter capacitor output end be direct-flow output signal output end.
7. signal-isolated transmission circuit according to claim 6, it is characterised in that: metal-oxide-semiconductor driving circuit includes resistance R1A
~resistance R3A, capacitor C2A, capacitor C3A, diode D1A, the one end capacitor C2A connect the Same Name of Ends of transformer secondary winding, electricity
Hold the C2A other end and connect the one end resistance R1A, the one end resistance R2A, diode D1A cathode, it is defeated that the resistance R1A other end connects direct current
The reference end of signal out, the resistance R2A other end connect diode D1A anode, this tie point is the output of metal-oxide-semiconductor driving circuit
End；The one end capacitor C3A connects the different name end of transformer secondary winding, and the capacitor C3A other end is connected to directly after connecting with resistance R3A
Flow the reference end of output signal.
8. wanting 4 or 6 any signal-isolated transmission circuits according to right, it is characterised in that: the rectification circuit, by electricity
It hinders R15, capacitor C1A to constitute, the one end resistance R15 is connected with the centre tap of transformer secondary winding, the resistance R15 other end and electricity
Hold the one end C1A to be connected, and the output end as direct-flow output signal, the capacitor C1A other end connects the reference of direct-flow output signal
End.
9. according to claim 1 to signal-isolated transmission circuit described in 7 any one, it is characterised in that: direct-flow input signal
Voltage value be greater than signals revivification circuit in metal-oxide-semiconductor TR1A and metal-oxide-semiconductor TR2A grid cut-in voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501982.7A CN109617415A (en) | 2018-12-07 | 2018-12-07 | A kind of signal-isolated transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501982.7A CN109617415A (en) | 2018-12-07 | 2018-12-07 | A kind of signal-isolated transmission circuit |
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| Publication Number | Publication Date |
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| CN109617415A true CN109617415A (en) | 2019-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811501982.7A Withdrawn CN109617415A (en) | 2018-12-07 | 2018-12-07 | A kind of signal-isolated transmission circuit |
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| CN (1) | CN109617415A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518902A (en) * | 2019-08-22 | 2019-11-29 | 广州金升阳科技有限公司 | A kind of pulse width signal isolation and transmission circuit |
| CN111082799A (en) * | 2019-12-25 | 2020-04-28 | 广州金升阳科技有限公司 | Signal isolation transmission circuit |
| CN112688564A (en) * | 2019-10-17 | 2021-04-20 | 上海辰竹仪表有限公司 | Isolation transmission circuit of transformer based on center tap removal |
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| CN101867365A (en) * | 2010-04-28 | 2010-10-20 | 广州金升阳科技有限公司 | Circuit for converting direct-current positive and negative bipolar signal into unipolar signal through isolation |
| CN102891607A (en) * | 2012-10-17 | 2013-01-23 | 中国兵器工业集团第二一四研究所苏州研发中心 | Forward primary-side isolation driving synchronous rectifier circuit |
| CN103560778A (en) * | 2013-10-16 | 2014-02-05 | 广州金升阳科技有限公司 | Two-wire system signal isolation transmission circuit |
| CN107086794A (en) * | 2017-06-26 | 2017-08-22 | 山东佳泽睿安信息技术有限公司 | A kind of full isolated DC high current circuit of synchronous rectification |
| US20170288556A1 (en) * | 2016-03-30 | 2017-10-05 | Infineon Technologies Austria Ag | Circuits and Methods for Auxiliary Secondary Supply Generation with Self-Starting Primary Side Driver in Isolated Power Converters |
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| CN101867365A (en) * | 2010-04-28 | 2010-10-20 | 广州金升阳科技有限公司 | Circuit for converting direct-current positive and negative bipolar signal into unipolar signal through isolation |
| CN102891607A (en) * | 2012-10-17 | 2013-01-23 | 中国兵器工业集团第二一四研究所苏州研发中心 | Forward primary-side isolation driving synchronous rectifier circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110518902A (en) * | 2019-08-22 | 2019-11-29 | 广州金升阳科技有限公司 | A kind of pulse width signal isolation and transmission circuit |
| CN112688564A (en) * | 2019-10-17 | 2021-04-20 | 上海辰竹仪表有限公司 | Isolation transmission circuit of transformer based on center tap removal |
| CN112688564B (en) * | 2019-10-17 | 2022-08-09 | 上海辰竹仪表有限公司 | Isolation transmission circuit of transformer based on center tap removal |
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| CN111082799B (en) * | 2019-12-25 | 2023-06-06 | 广州金升阳科技有限公司 | Signal isolation transmission circuit |
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