CN106160555A - A kind of pure sine wave inverter with filtering pwm signal isolation features - Google Patents
A kind of pure sine wave inverter with filtering pwm signal isolation features Download PDFInfo
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- CN106160555A CN106160555A CN201610515239.1A CN201610515239A CN106160555A CN 106160555 A CN106160555 A CN 106160555A CN 201610515239 A CN201610515239 A CN 201610515239A CN 106160555 A CN106160555 A CN 106160555A
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- 238000001914 filtration Methods 0.000 title claims abstract description 67
- 238000002955 isolation Methods 0.000 title claims abstract description 43
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- 238000001514 detection method Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 238000005070 sampling Methods 0.000 abstract description 18
- 238000013461 design Methods 0.000 abstract description 5
- 238000004891 communication Methods 0.000 abstract description 4
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Classifications
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/257—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with comparison of different reference values with the value of voltage or current, e.g. using step-by-step method
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of pure sine wave inverter with filtering pwm signal isolation features, drive module, LC filtration module, sine-wave generator, MCU and voltage sample module including Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM；Voltage comparator circuit includes that voltage comparator, the first resistance are to the 7th resistance and the first stabilivolt；LC filtration module includes the 31st to the 43rd electric capacity, the 31st to the 34th inductance, the 31st to the 33rd resistance, the 31st to the 34th diode, adapter and active filter.Power supply input can be effectively isolated by the present invention, circuit design structure is simple, powerful, use flexibly, the scope of application is relatively wide, be avoided that signal disturbing, ensure instrument gather data accurately, control signal and voltage sampling signal can be effectively isolated, improve sampling precision, the long-range wire communication being used under complex environment.
Description
Technical field
The present invention relates to inverter field, particularly to a kind of have filtering pwm signal isolation features pure sine wave inverse
Become device.
Background technology
Inverter is a kind of device that unidirectional current is converted to alternating current, at present, and a kind of modified sine wave inversion of use
Device, is connected and composed by low-voltage driving control circuit, pulse width modulation output driving circuit and protection circuit for input and output, but
The waveform that the modified sine wave inverter of this structure produces is when using precision instrument, owing to not isolating, and signal disturbing
Relatively big, cause collection data inaccurate, especially at some armarium, on military equipment, the requirement for elaboration is higher,
Also serious consequence can be produced even if somewhat disturbing.
Pulse width modulation is a kind of analog control mode, its according to the change of respective loads come modulation transistor base stage or
The biasing of metal-oxide-semiconductor grid, realizes transistor or the change of metal-oxide-semiconductor ON time, thus realizes switching power supply output
Change.This mode can make the output voltage of power supply keep constant when operation conditions change, is the numeral utilizing microprocessor
The very effective technology of one that analog circuit is controlled by signal.But existing pwm control circuit design structure is complicated, makes
With underaction, the scope of application is narrower.
It addition, in the circuit board of electric equipment, cause the infringement to electrical equipment to prevent the larger fluctuation of line voltage,
One voltage sampling circuit would generally be set, and the signal that voltage sampling circuit is obtained is delivered to single-chip microcomputer and processed, and works as inspection
When measuring line voltage more than some numerical value or less than a certain numerical value, the control circuit that single-chip microcomputer is relevant will control electrical equipment and stop
Only work, in order to avoid causing damage to it.As the voltage sampling circuit in electromagnetic oven send the signal obtaining line voltage sampling
Processing to single-chip microcomputer, when electromagnetic oven works, the change of single-chip microcomputer moment detection voltage sampling signal, when line voltage is big
During in 260 volts or less than 160 volts, single-chip microcomputer can export relevant protection instruction, make electromagnetic oven stop heating；Single-chip microcomputer works
Time, also can automatically adjust pwm signal according to the change of voltage signal, make electromagnetic oven do firm power and process.
But, in existing voltage sampling circuit, generally use voltage formula to sample, the variable to required sampling
Directly sample, Single-chip Controlling signal is not effectively isolated with voltage sampling signal, thus affect control
, there is the problem that sampling error is bigger in precision.
LC filtration module is the important component part in inverter, and it utilizes inductance, electric capacity and resistance to combine, and can filter
Except certain once or multiple harmonic, reactive-load compensation and voltage regulation function are had concurrently.When existing LC filtration module cannot be used for complex environment
Under long-range wire communication.
Summary of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, it is provided that a kind of to power supply input
Can carry out being effectively isolated, circuit design structure is simple, powerful, use flexibly, the scope of application is relatively wide, be avoided that signal is done
Disturb, ensure instrument gather data accurately, can carry out control signal and voltage sampling signal being effectively isolated, improve sampling precision,
The pure sine wave inverter with filtering pwm signal isolation features of the long-range wire communication being used under complex environment.
The technical solution adopted for the present invention to solve the technical problems is: structure one has filtering pwm signal isolation merit
The pure sine wave inverter of energy, including Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtering mould
Block, SPWM drive module, LC filtration module, sine-wave generator, MCU and voltage sample module, described input isolation module
Input is connected with an outfan of described Power Entry Module, the outfan of described input isolation module and described PWM
The input of module connects, and the input of described Transformer Rectifier filtration module is connected with the outfan of described PWM module, institute
Stating SPWM drives an input of module to be connected with the outfan of described Transformer Rectifier filtration module, described LC filtration module defeated
Entering end drives the outfan of module to be connected with described SPWM, the input of described sine-wave generator and described LC filtration module
Outfan connects, and the input of described voltage sample module is connected with another outfan of described Power Entry Module, described MCU
An input be connected with the outfan of described voltage sample module；
Described PWM module includes time base circuit chip, the 21st resistance, the 22nd resistance, the 23rd electricity
Resistance, the 24th resistance, the 25th resistance, the 26th resistance, the 27th resistance, the 28th resistance, the 29th
Resistance, the 30th resistance, the 21st electric capacity, the 22nd electric capacity, the 23rd electric capacity, the 24th electric capacity, the 25th
Electric capacity, the 26th electric capacity, the 27th electric capacity, the 28th electric capacity, the 11st diode, the 12nd diode, the 13rd
Diode, the 11st audion and the 12nd metal-oxide-semiconductor, one end of described 21st resistance respectively with described 20th electric capacity
One end of one end and the 22nd resistance connects, and the other end of described 20th electric capacity passes through described 24th resistance eutral grounding,
The other end of described 22nd resistance is connected with described one end of 23rd resistance and one end of the 22nd electric capacity respectively,
The other end of described 22nd electric capacity passes through described 25th resistance eutral grounding, and the other end of described 23rd resistance is respectively
It is connected with one end of negative electrode, one end of the 23rd electric capacity and the 26th resistance of described 11st diode, the described tenth
The plus earth of one diode, the other end of described 23rd electric capacity respectively with the 4th pin of described time base circuit chip and
8th pin connects, and the other end of described 26th resistance is by described 24th electric capacity and described 27th resistance
One end connects, one end of described 27th resistance also by described 30th resistance eutral grounding, described 27th resistance another
One end is connected with the base stage of described 11st audion, the emitter stage of described 11st audion and described 28th resistance
One end connects, and the other end of described 23rd electric capacity passes through another of described 25th electric capacity and described 28th resistance
End connects, the anode of described 12nd diode respectively with the of the colelctor electrode of described 11st audion and time base circuit chip
Seven pins connect, and the negative electrode of described 12nd diode is connected with the 6th pin of described time base circuit chip, base electricity time described
3rd pin of road chip is connected with the grid of described 12nd metal-oxide-semiconductor by described 29th resistance, described 12nd MOS
The drain electrode of pipe is connected with the other end of described 28th resistance by described 13rd diode, described 12nd metal-oxide-semiconductor
Source ground, the second pin of described time base circuit chip passes sequentially through described 26th electric capacity and the 28th electric capacity connects
Ground, the 5th pin of described time base circuit chip passes through described 27th capacity earth, the first of described time base circuit chip
Pin ground connection；
Described voltage sample module includes that the rectification circuit being sequentially connected with, voltage comparator circuit, photoelectrical coupler, voltage turn
Change circuit and smoothed filter circuit；Described voltage comparator circuit includes voltage comparator, the first resistance, the second resistance, the 3rd electricity
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electric capacity, the second electric capacity and the first stabilivolt, described voltage
The in-phase input end of comparator is connected with one end of described first resistance and one end of the second resistance respectively by described 5th resistance
Connecing, the other end of described first resistance is connected with the cathode output end of described rectification circuit, described voltage comparator anti-phase defeated
Enter end by described 6th resistance respectively with one end of one end, one end of the 4th resistance and first electric capacity of described 3rd resistance even
Connecing, the other end of described 3rd resistance connects the first voltage source, the other end of described second resistance, the other end of the 4th resistance and
The other end of the first electric capacity all cathode output ends with described rectification circuit are connected, and a pin of described voltage comparator is respectively
It is connected with one end of described first voltage source and the second electric capacity, the other end of described second electric capacity and the negative pole of described rectification circuit
Outfan connects, the outfan of described voltage comparator by described 7th resistance respectively with the negative electrode of described first stabilivolt and
In photoelectrical coupler, the anode of light emitting diode connects, and the anode of described first stabilivolt exports with the negative pole of described rectification circuit
End connects, and in described photoelectrical coupler, the colelctor electrode of phototriode is connected with described voltage conversion circuit；
Described LC filtration module includes the 31st electric capacity, the 32nd electric capacity, the 33rd electric capacity, the 34th electricity
Appearance, the 35th electric capacity, the 36th electric capacity, the 37th electric capacity, the 38th electric capacity, the 39th electric capacity, the 40th electricity
Appearance, the 41st electric capacity, the 42nd electric capacity, the 43rd electric capacity, the 31st inductance, the 32nd inductance, the 33rd
Inductance, the 34th inductance, the 31st resistance, the 32nd resistance, the 33rd resistance, the 31st diode, the 3rd
12 diodes, the 33rd diode, the 34th diode, adapter and active filter, described 31st electric capacity,
32nd electric capacity, the 33rd electric capacity and the 34th electric capacity are in parallel, described 31st electric capacity, the 32nd electric capacity, the
33 electric capacity and the 34th electric capacity one end in parallel is connected with described adapter, and the other end of parallel connection passes sequentially through described the
31 inductance and the 31st resistance are connected with one end of described 32nd inductance, the other end of described 32nd inductance
Ground connection；Described 35th electric capacity, the 36th electric capacity and the 37th electric capacity are in parallel, described 35th electric capacity, the 30th
Six electric capacity and the 37th electric capacity one end in parallel respectively with one end and the one of the 33rd inductance of described 32nd inductance
End connects, other end ground connection in parallel；Described 38th electric capacity, the 39th electric capacity and the 40th electric capacity are in parallel, and described the
One end of 38 electric capacity, the 39th electric capacity and the parallel connection of the 40th electric capacity is connected with the other end of described 33rd inductance,
The other end in parallel is connected with one end and the active filter of described 34th inductance respectively, described 34th inductance another
One end ground connection；Described 41st electric capacity, the 42nd electric capacity and the 43rd electric capacity are in parallel, described 41st electric capacity, the
One end of 42 electric capacity and the parallel connection of the 43rd electric capacity is connected with one end of described 34th inductance, another termination in parallel
Ground；One end of described 32nd resistance is connected with one end of described 34th inductance, another of described 32nd resistance
End is respectively with the anode of one end, the negative electrode of the 31st diode and the 33rd diode of described 33rd resistance even
Connect, the other end ground connection of described 33rd resistance, the anode of described 31st diode and described 32nd diode
Negative electrode connect, the plus earth of described 32nd diode, the negative electrode and the described 30th of described 33rd diode
The anode of four diodes connects, the minus earth of described 34th diode.
In the pure sine wave inverter with filtering pwm signal isolation features of the present invention, described voltage sample
Module also includes the 8th resistance, and the outfan of described voltage comparator is also by described 7th resistance and the one of described 8th resistance
End connects, and the other end of described 8th resistance is connected with described first voltage source.
In the pure sine wave inverter with filtering pwm signal isolation features of the present invention, described voltage is changed
Circuit includes audion, the 9th resistance and the tenth resistance, the base stage of described audion and photosensitive three poles in described photoelectrical coupler
The colelctor electrode of pipe connects, and the base stage of described audion connects the second voltage source also by described 9th resistance, described audion
Colelctor electrode connects described second voltage source, the grounded emitter of described audion by described tenth resistance.
In the pure sine wave inverter with filtering pwm signal isolation features of the present invention, described smothing filtering
Circuit includes the 11st resistance, the 12nd resistance, the 13rd resistance, the 3rd electric capacity and the 4th electric capacity；Described 11st resistance
One end is connected with the colelctor electrode of described audion, the other end of described 11st resistance respectively with one end of described 12nd resistance
Connect with one end of the 3rd electric capacity, the other end, one end of the 13rd resistance and one end of the 4th electric capacity of described 12nd resistance
Being all connected with voltage output end, the other end of the other end, the other end of the 13rd resistance and the 4th electric capacity of described 3rd electric capacity is equal
Ground connection.
In the pure sine wave inverter with filtering pwm signal isolation features of the present invention, described voltage sample
Module also includes the second stabilivolt, and the negative electrode of described second stabilivolt connects described voltage output end, described second stabilivolt
Plus earth.
In the pure sine wave inverter with filtering pwm signal isolation features of the present invention, also include that electric current is adopted
Original mold block and display module, the input of described current sample module is connected with another outfan of described PWM module, institute
Another input of the outfan and described MCU of stating current sample module is connected, the outfan of described MCU and described display module
Input connect.
In the pure sine wave inverter with filtering pwm signal isolation features of the present invention, also include output electricity
Pressure detection module, an input of described output voltage detection module drives another outfan of module to be connected with described SPWM,
Another input of described output voltage detection module is connected with the outfan of described sine-wave generator.
In the pure sine wave inverter with filtering pwm signal isolation features of the present invention, described rectification circuit
Including the first diode, the second diode, the 3rd diode and the 4th diode, the anode and the four or two of described first diode
The negative electrode of pole pipe is all connected with the live wire of alternating current, the anode of described second diode and the negative electrode of the 3rd diode all with exchange
The zero line of electricity connects, after the negative electrode of described first diode and the negative electrode connection of the second diode as described rectification circuit just
Pole outfan, the anode of described 3rd diode and the anode of the 4th diode are defeated as the negative pole of described rectification circuit after connecting
Go out end.
Implement the pure sine wave inverter with filtering pwm signal isolation features of the present invention, have the advantages that
Due to use Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM drive module,
LC filtration module, sine-wave generator, MCU and voltage sample module, the circuit structure of PWM module is simple, voltage sample
Module includes rectification circuit, voltage comparator circuit, photoelectrical coupler, voltage conversion circuit and the smooth filtered electrical being sequentially connected with
Road, power supply input can be effectively isolated by input isolation module, and SPWM changes modulation pulse exactly on the basis of PWM
Mode, pulse width time dutycycle press sine gauge rate arrangement, such output waveform can accomplish sine through suitable filtering
Ripple exports, and LC filtration module is used for harmonic compensation, and employing photoelectrical coupler can be by MCU control signal and voltage sampling signal
Effectively isolate, thus its to power supply input can be effectively isolated, circuit design structure is simple, powerful, use
Flexibly, the scope of application is relatively wide, be avoided that signal disturbing, ensure instrument gather data accurately, can be by control signal and voltage sample
Signal carries out being effectively isolated, improving sampling precision, the long-range wire communication being used under complex environment.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure that the present invention has in one embodiment of pure sine wave inverter of filtering pwm signal isolation features
Schematic diagram；
Fig. 2 is the circuit theory diagrams of PWM module in described embodiment；
Fig. 3 is the circuit theory diagrams of voltage sample module in described embodiment；
Fig. 4 is the circuit theory diagrams of LC filtration module in described embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
In the present invention has the pure sine wave inverter embodiment of filtering pwm signal isolation features, this has filtering PWM
The structural representation of the pure sine wave inverter of signal isolation features is as shown in Figure 1.In Fig. 1, this has filtering pwm signal isolation
The pure sine wave inverter of function includes Power Entry Module 1, input isolation module 2, PWM module 3, Transformer Rectifier filtering
Module 4, SPWM drive module 5, LC filtration module 6, sine-wave generator 7, MCU8 and voltage sample module 9, wherein, input every
It is connected with an outfan of Power Entry Module 1 from the input of module 2, the outfan of input isolation module 2 and PWM mould
The input of block 3 connects, and the input of Transformer Rectifier filtration module 4 is connected with the outfan of PWM module 3, and SPWM drives
One input of module 5 is connected with the outfan of Transformer Rectifier filtration module 4, and the input of LC filtration module 6 drives with SPWM
The outfan of module 5 connects, and the input of sine-wave generator 7 is connected with the outfan of LC filtration module 6, voltage sample module
The input of 9 is connected with another outfan of Power Entry Module 1, an input of MCU8 and the output of voltage sample module 9
End connects.The benefit using MCU8 is simple, cheap.
It is noted that SPWM changes modulation pulse mode, pulse width time duty exactly on the basis of PWM
Arranging than by sine gauge rate, such output waveform can accomplish sinewave output through suitable filtering, and wherein PWM is exactly pulse
Width modulated.LC filtration module 6 in the present embodiment is used for carrying out harmonic compensation.Thus can produce pure sine wave, be avoided that
The interference of signal, it is ensured that instrument gathers the accuracy of data.
Fig. 2 is the circuit theory diagrams of PWM module in the present embodiment.In Fig. 2, PWM module 3 includes time base circuit
Chip U5, the 21st resistance R21, the 22nd resistance R22, the 23rd resistance R23, the 24th resistance R24, the 20th
Five resistance R25, the 26th resistance R26, the 27th resistance R27, the 28th resistance R28, the 29th resistance R29,
30 resistance R30, the 21st electric capacity C21, the 22nd electric capacity C22, the 23rd electric capacity C23, the 24th electric capacity C24,
25th electric capacity C25, the 26th electric capacity C26, the 27th electric capacity C27, the 28th electric capacity C28, the 11st diode
D11, the 12nd diode D12, the 13rd diode D13, the 11st audion T11 and the 12nd metal-oxide-semiconductor T12.It is worth mentioning
, in the present embodiment, the 11st diode D11 is stabilivolt, and the 11st audion T11 is PNP type triode, the 12nd
Metal-oxide-semiconductor T12 is N-channel MOS pipe.The packing forms of time base circuit chip U5 uses DIP8 dual-in-line package.
Concrete, in the present embodiment, one end of the 21st resistance R21 respectively with one end of the 20th electric capacity C20 and the
One end of 22 resistance R22 connects, and the other end of the 20th electric capacity C20 passes through the 24th resistance R24 ground connection, and the 22nd
The other end of resistance R22 is connected with one end of the 23rd resistance R23 and one end of the 22nd electric capacity C22 respectively, and the 20th
The other end of two electric capacity C22 passes through the 25th resistance R25 ground connection, and the other end of the 23rd resistance R23 is respectively with the 11st
One end of the negative electrode of diode D11, one end of the 23rd electric capacity C23 and the 26th resistance R26 connects, the 11st diode
The plus earth of D11, the other end of the 23rd electric capacity C23 respectively with the 4th pin and the 8th pin of time base circuit chip U5
Connecting, the other end of the 26th resistance R26 is connected by one end of the 24th electric capacity C24 and the 27th resistance R27, the
One end of 27 resistance R27 is also by the 30th resistance R30 ground connection, the other end and the 11st of the 27th resistance R27
The base stage of pole pipe T11 connects, and the emitter stage of the 11st audion T11 and one end of the 28th resistance R28 connect, and the 23rd
The other end of electric capacity C23 is connected by the other end of the 25th electric capacity C25 and the 28th resistance R28, the 12nd diode
The anode of D12 is connected with the colelctor electrode of the 11st audion T11 and the 7th pin of time base circuit chip U5 respectively, and the 12nd
The negative electrode of pole pipe D11 is connected with the 6th pin of time base circuit chip U5, and the 3rd pin of time base circuit chip U5 passes through second
The grid of 19 resistance R29 and the 12nd metal-oxide-semiconductor T12 connects, and the drain electrode of the 12nd metal-oxide-semiconductor T12 is by the 13rd diode D13
Being connected with the other end of the 28th resistance R28, the source ground of the 12nd metal-oxide-semiconductor T12, the second of time base circuit chip U5 is drawn
Foot passes sequentially through the 26th electric capacity C26 and the 28th electric capacity C28 ground connection, and the 5th pin of time base circuit chip U5 is by the
27 electric capacity C27 ground connection, the first pin ground connection of time base circuit chip U5.This PWM module 3 circuit design structure letter
Single, powerful, use flexibly, the scope of application relatively wide, can be used to produce time delay and multiple pulse signal, can be widely used for
In various electronic products.
Fig. 3 is the circuit theory diagrams of voltage sample module in the present embodiment.In the present embodiment, voltage sample module 9 includes
Rectification circuit, voltage comparator circuit, photoelectrical coupler U1, voltage conversion circuit and the smoothed filter circuit being sequentially connected with；Wherein,
Voltage comparator circuit include voltage comparator U2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th
Resistance R5, the 6th resistance R6, the 7th resistance R7, the first electric capacity C1, the second electric capacity C2 and the first stabilivolt ZD1, voltage comparator
The in-phase input end of U2 is connected with one end of the first resistance R1 and one end of the second resistance R2 respectively by the 5th resistance R5, and the 5th
Resistance R5 for carrying out current limliting to the in-phase input end of voltage comparator U2, and the other end of the first resistance R1 is with rectification circuit just
Pole outfan connects, the inverting input of voltage comparator U2 by the 6th resistance R6 respectively with one end of the 3rd resistance R3, the
One end of four resistance R4 and one end of the first electric capacity C1 connect, and the 6th resistance R6 is for the inverting input to voltage comparator U2
Carry out current limliting, the other end of the 3rd resistance R3 connects the first voltage source VDD1, the other end of the second resistance R2, the 4th resistance R4
The other end of the other end and the first electric capacity C1 is all connected with the cathode output end of rectification circuit, a pin of voltage comparator U2
One end with the first voltage source VDD1 and the second electric capacity C2 is connected respectively, the other end of the second electric capacity C2 and the negative pole of rectification circuit
Outfan connects, the outfan of voltage comparator U2 by the 7th resistance R7 respectively with negative electrode and the photoelectricity of the first stabilivolt ZD1
In bonder U1, the anode of light emitting diode connects, and the 7th resistance R7 is used for the outfan of voltage comparator U2 is carried out current limliting,
The anode of the first stabilivolt ZD1 is connected with the cathode output end of rectification circuit, and the first stabilivolt ZD1 is for voltage comparator U2
The voltage signal of outfan output carry out voltage stabilizing, the colelctor electrode of phototriode and voltage conversion circuit in photoelectrical coupler U1
Connect.By using photoelectrical coupler U1 to isolate, control signal effectively can be isolated with sampled signal, effectively
Avoiding the impact on control signal of the external voltage electrical network, its control accuracy is higher, and sampling error is less.
In the present embodiment, voltage sample module 9 also includes the 8th resistance R8, and the outfan of voltage comparator U2 is also by
One end of seven resistance R7 and the 8th resistance R8 connects, and the other end of the 8th resistance R8 and the first voltage source VDD1 connect.
In the present embodiment, voltage conversion circuit includes audion Q1, the 9th resistance R9 and the tenth resistance R10, audion Q1
Base stage be connected with the colelctor electrode of phototriode in photoelectrical coupler U1, the base stage of audion Q1 is also by the 9th resistance R9 even
Meeting the second voltage source VDD2, the colelctor electrode of audion Q1 connects the second voltage source VDD2 by the tenth resistance R10, audion Q1's
Grounded emitter, the negative pole of the i.e. second voltage source VDD2.
In the present embodiment, smoothed filter circuit include the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13,
3rd electric capacity C3 and the 4th electric capacity C4；Wherein, one end of the 11st resistance R11 is connected with the colelctor electrode of audion Q1, and the 11st
The other end of resistance R11 is connected with one end of the 12nd resistance R12 and one end of the 3rd electric capacity C3 respectively, the 12nd resistance R12
One end of the other end, one end of the 13rd resistance R13 and the 4th electric capacity C4 be all connected with voltage output end Vo, the 3rd electric capacity C3's
The other end, the other end of the 13rd resistance R13 and the equal ground connection of the other end of the 4th electric capacity C4.In order to protect MCU8, this voltage is adopted
Original mold block 9 also includes the second stabilivolt ZD2, is equivalent to the outfan second stabilivolt ZD2 in parallel at smoothed filter circuit, second
The negative electrode of stabilivolt ZD2 connects voltage output end Vo, the plus earth of the second stabilivolt ZD2.By the voltage of smoothed filter circuit
Output end vo is connected with an input of MCU8, makes smoothed filtered voltage sampling signal deliver to MCU8 process,
MCU8 just can protect electric equipment according to the obtained corresponding instruction of sampled signal output effectively.
In the present embodiment, rectification circuit includes the first diode D1, the second diode D2, the 3rd diode D3 and the four or two
Pole pipe D4, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 form bridge rectifier,
The anode of the first diode D1 and the negative electrode of the 4th diode D4 are all connected with the live wire ACL of alternating current, the second diode D2's
The negative electrode of anode and the 3rd diode D3 is all connected with the zero line ACN of alternating current, the negative electrode of the first diode D1 and the two or two pole
As the cathode output end of rectification circuit, the anode of the 3rd diode D3 and the sun of the 4th diode D4 after the negative electrode connection of pipe D2
As the cathode output end of rectification circuit after the connection of pole.
In the present embodiment, when line voltage (such as 220V/50Hz) obtains the all-wave electricity of pulsation after rectifier circuit rectifies
Pressure signal, the first resistance R1 and the second resistance R2 carries out dividing potential drop to it, the voltage on the second resistance R2 as sampled voltage, the 4th
Voltage on resistance R4 is as reference voltage.The square-wave signal of the outfan output of voltage comparator U2 drives photoelectrical coupler U1
Work, in photoelectrical coupler U1, the signal of the colelctor electrode output of phototriode is through voltage conversion circuit and smoothed filter circuit
The disposal of gentle filter after, the direct current signal obtained is input to MCU8 process.When line voltage changes, voltage ratio
The relatively output signal of the outfan of device U2 also changes, and correspondingly, obtain after voltage conversion and the disposal of gentle filter is straight
Stream signal changes the most therewith, and MCU8 just can protect electricity according to the obtained corresponding instruction of voltage sampling signal output effectively
Device equipment.
In the present embodiment, this pure sine wave inverter with filtering pwm signal isolation features also includes current sample mould
Block 10 and display module 11, the input of current sample module 10 is connected with another outfan of PWM module 3, and electric current is adopted
The outfan of original mold block 10 is connected with another input of MCU8, and the outfan of MCU8 is connected with the input of display module 11.
Voltage and power can be found out intuitively by display module 11.
Concrete, in the present embodiment, gather the input voltage of Power Entry Module 1 through voltage sample module 9, then through MCU8
Control display module 11 and demonstrate magnitude of voltage；Display module 11 can also be used to show output, through current sample module 10
Electric current after acquisition pulse width modulated, then calculated power by MCU8, drive display module 11 to show power；MCU8 is all right
The duty being used for detecting each module is the most normal, when MCU8 detects the working state abnormal of certain module, permissible
Display module 11 is driven to show miscue.Have only to as required, it can be realized that the numerical value of input voltage, output
The duty of numerical value and this pure sine wave inverter with filtering pwm signal isolation features is the most normal, can make work
Make personnel whole system is had to grasp well.
In the present embodiment, this pure sine wave inverter with filtering pwm signal isolation features also includes that output voltage is examined
Surveying module 12, an input of output voltage detection module 12 drives another outfan of module 5 to be connected with SPWM, output voltage
Another input of detection module 12 is connected with the outfan of sine-wave generator 7.In real time sine-wave generator 7 can be carried out
Voltage Feedback, whether detection voltage meets needs, then regulates SPWM and drive module 5 to change pulse, reaches required voltage, also
That is the voltage allowing this pure sine wave inverter with filtering pwm signal isolation features finally obtain can meet needs.
Fig. 4 is the circuit theory diagrams of LC filtration module in the present embodiment.In Fig. 4, LC filtration module 6 includes the 31st electricity
Hold C31, the 32nd electric capacity C32, the 33rd electric capacity C33, the 34th electric capacity C34, the 35th electric capacity C35, the 30th
Six electric capacity C36, the 37th electric capacity C37, the 38th electric capacity C38, the 39th electric capacity C39, the 40th electric capacity C40, the 4th
11 electric capacity C41, the 42nd electric capacity C42, the 43rd electric capacity C43, the 31st inductance L31, the 32nd inductance L32,
33rd inductance L33, the 34th inductance L34, the 31st resistance R31, the 32nd resistance R32, the 33rd resistance
R33, the 31st diode V31, the 32nd diode V32, the 33rd diode V33, the 34th diode V34,
Adapter and active filter (not shown).
Wherein, the 31st electric capacity C31, the 32nd electric capacity C32, the 33rd electric capacity C33 and the 34th electric capacity C34
Parallel connection, the 31st electric capacity C31, the 32nd electric capacity C32, the 33rd electric capacity C33 and the one of the 34th electric capacity C34 parallel connection
End is connected with adapter, and the other end in parallel passes sequentially through the 31st inductance L31 and the 31st resistance R31 and the 32nd
One end of inductance L32 connects, the other end ground connection of the 32nd inductance L32.It is noted that the 31st resistance R3 is limited
Leakage resistance, so can carry out overcurrent protection.
In the present embodiment, the 35th electric capacity C35, the 36th electric capacity C36 and the 37th electric capacity C37 are in parallel, and the 3rd
One end of 15 electric capacity C35, the 36th electric capacity C36 and the 37th electric capacity C37 parallel connection is respectively with the 32nd inductance L32's
One end of one end and the 33rd inductance L33 connects, other end ground connection in parallel.
In the present embodiment, the 38th electric capacity C38, the 39th electric capacity C39 and the 40th electric capacity C40 are in parallel, and the 30th
One end of eight electric capacity C38, the 39th electric capacity C39 and the 40th electric capacity C40 parallel connection is with the other end of the 33rd inductance L33 even
Connecing, the other end in parallel is connected with one end and the active filter of the 34th inductance L34 respectively, the 34th inductance L34's
Other end ground connection.
In the present embodiment, the 41st electric capacity C41, the 42nd electric capacity C42 and the 43rd electric capacity C43 are in parallel, and the 4th
One end of 11 electric capacity C41, the 42nd electric capacity C42 and the 43rd electric capacity C43 parallel connection and one end of the 34th inductance L34
Connect, other end ground connection in parallel.
In the present embodiment, one end of the 32nd resistance R32 is connected with one end of the 34th inductance L34, and the 32nd
The other end of resistance R32 respectively with one end, the negative electrode and the 33rd of the 31st diode V31 of the 33rd resistance R33
The anode of diode V33 connects, the other end ground connection of the 33rd resistance R33, the anode and the 3rd of the 31st diode V31
The negative electrode of 12 diode V32 connects, the plus earth of the 32nd diode V32, the negative electrode of the 33rd diode V33 with
The anode of the 34th diode V34 connects, the minus earth of the 34th diode V34.It is noted that the present embodiment
In, the 32nd resistance R32 is current-limiting resistance, so can be carried out overcurrent protection.
Concrete, in the present embodiment, the 31st electric capacity C31, the 32nd electric capacity C32, the 33rd electric capacity C33 and the
34 electric capacity C34 and the 31st inductance L31 form the first series resonant circuit, the 38th electric capacity C38, the 39th electricity
Hold C39, the 40th electric capacity C40 and the 33rd inductance L33 and form the second series resonant circuit, the 35th electric capacity C35, the 3rd
16 electric capacity C36 and the 37th electric capacity C37 and the 32nd inductance L32 form the first antiresonant circuit, the 41st electricity
Hold C41, the 42nd electric capacity C42 and the 43rd electric capacity C43 and the 34th inductance L34 and form the second antiresonant circuit,
The signal being extracted is through by resonance circuit the first series resonant circuit, the second series resonant circuit, the first antiresonant circuit
With second antiresonant circuit composition bank of filters time, produce resonance, make useful signal pass through, mask useless letter
Number, the 33rd resistance R33 is resonance build-out resistor, the 31st diode V31, the 32nd diode V32, the 33rd
Diode V33, the 34th diode V34 constitute amplitude limiter, signal maximum amplitude limit is one and specifies numerical value, such as:
1.5V, thus have compressed working range, be conducive to improving the property of this pure sine wave inverter with filtering input isolation features
Energy.The present invention can under the adverse circumstances such as high temperature, high humidity, high salt fog reliably working, antidetonation, anti-electromagnetic interference capability are strong, receive
Highly sensitive.
In a word, in the present embodiment, this pure sine wave inverter with filtering pwm signal isolation features is used in medical treatment
Equipment, time on military equipment, will not produce the interference of signal, and the accuracy of the data that instrument records also is greatly improved.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (8)
1. a pure sine wave inverter with filtering pwm signal isolation features, it is characterised in that include that power supply inputs mould
Block, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM drive module, LC filtration module, sine wave to send out
Raw device, MCU and voltage sample module, the input of described input isolation module connects with an outfan of described Power Entry Module
Connecing, the outfan of described input isolation module is connected with the input of described PWM module, described Transformer Rectifier filtration module
Input be connected with the outfan of described PWM module, described SPWM drive module an input whole with described transformation
The outfan of stream filtration module connects, and the input of described LC filtration module drives the outfan of module to be connected with described SPWM,
The input of described sine-wave generator is connected with the outfan of described LC filtration module, the input of described voltage sample module
It is connected with another outfan of described Power Entry Module, an input of described MCU and the output of described voltage sample module
End connects；
Described PWM module include time base circuit chip, the 21st resistance, the 22nd resistance, the 23rd resistance,
24 resistance, the 25th resistance, the 26th resistance, the 27th resistance, the 28th resistance, the 29th resistance,
30th resistance, the 21st electric capacity, the 22nd electric capacity, the 23rd electric capacity, the 24th electric capacity, the 25th electric capacity,
26th electric capacity, the 27th electric capacity, the 28th electric capacity, the 11st diode, the 12nd diode, the 13rd pole
Pipe, the 11st audion and the 12nd metal-oxide-semiconductor, one end of described 21st resistance respectively with one end of described 20th electric capacity
Connecting with one end of the 22nd resistance, the other end of described 20th electric capacity passes through described 24th resistance eutral grounding, described
The other end of the 22nd resistance is connected with described one end of 23rd resistance and one end of the 22nd electric capacity respectively, described
The other end of the 22nd electric capacity pass through described 25th resistance eutral grounding, the other end of described 23rd resistance respectively with institute
The one end stating the negative electrode of the 11st diode, one end of the 23rd electric capacity and the 26th resistance connects, and the described 11st
The plus earth of pole pipe, the other end of described 23rd electric capacity respectively with the 4th pin and the 8th of described time base circuit chip
Pin connects, and the other end of described 26th resistance is by one end of described 24th electric capacity with described 27th resistance
Connecting, one end of described 27th resistance is also by described 30th resistance eutral grounding, the other end of described 27th resistance
It is connected with the base stage of described 11st audion, the emitter stage of described 11st audion and one end of described 28th resistance
Connecting, the other end of described 23rd electric capacity is connected by the other end of described 25th electric capacity with described 28th resistance
Connecing, the anode of described 12nd diode draws with the described colelctor electrode of the 11st audion and the 7th of time base circuit chip respectively
Foot connects, and the negative electrode of described 12nd diode is connected with the 6th pin of described time base circuit chip, described time base circuit core
3rd pin of sheet is connected with the grid of described 12nd metal-oxide-semiconductor by described 29th resistance, described 12nd metal-oxide-semiconductor
Drain electrode is connected with the other end of described 28th resistance by described 13rd diode, the source electrode of described 12nd metal-oxide-semiconductor
Ground connection, the second pin of described time base circuit chip passes sequentially through described 26th electric capacity and the 28th capacity earth, institute
The 5th pin stating time base circuit chip passes through described 27th capacity earth, and the first pin of described time base circuit chip connects
Ground；
Described voltage sample module includes that the rectification circuit being sequentially connected with, voltage comparator circuit, photoelectrical coupler, voltage change electricity
Road and smoothed filter circuit；Described voltage comparator circuit include voltage comparator, the first resistance, the second resistance, the 3rd resistance,
Four resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electric capacity, the second electric capacity and the first stabilivolt, described voltage ratio is relatively
The in-phase input end of device is connected with one end of described first resistance and one end of the second resistance respectively by described 5th resistance, institute
The cathode output end of the other end and described rectification circuit of stating the first resistance is connected, and the inverting input of described voltage comparator leads to
Cross described 6th resistance one end respectively with one end, one end of the 4th resistance and first electric capacity of described 3rd resistance to be connected, institute
The other end stating the 3rd resistance connects the first voltage source, the other end of described second resistance, the other end and first of the 4th resistance
The other end of electric capacity all cathode output ends with described rectification circuit are connected, a pin of described voltage comparator respectively with institute
The one end stating the first voltage source and the second electric capacity connects, and the other end of described second electric capacity exports with the negative pole of described rectification circuit
End connects, the outfan of described voltage comparator by described 7th resistance respectively with negative electrode and the photoelectricity of described first stabilivolt
In bonder, the anode of light emitting diode connects, and the anode of described first stabilivolt connects with the cathode output end of described rectification circuit
Connecing, in described photoelectrical coupler, the colelctor electrode of phototriode is connected with described voltage conversion circuit；
Described LC filtration module include the 31st electric capacity, the 32nd electric capacity, the 33rd electric capacity, the 34th electric capacity,
35 electric capacity, the 36th electric capacity, the 37th electric capacity, the 38th electric capacity, the 39th electric capacity, the 40th electric capacity,
41 electric capacity, the 42nd electric capacity, the 43rd electric capacity, the 31st inductance, the 32nd inductance, the 33rd inductance,
34th inductance, the 31st resistance, the 32nd resistance, the 33rd resistance, the 31st diode, the 32nd
Pole pipe, the 33rd diode, the 34th diode, adapter and active filter, described 31st electric capacity, the 30th
Two electric capacity, the 33rd electric capacity and the 34th electric capacity are in parallel, described 31st electric capacity, the 32nd electric capacity, the 33rd
One end of electric capacity and the parallel connection of the 34th electric capacity is connected with described adapter, and the other end in parallel passes sequentially through the described 31st
Inductance and the 31st resistance are connected with one end of described 32nd inductance, the other end ground connection of described 32nd inductance；
Described 35th electric capacity, the 36th electric capacity and the 37th electric capacity are in parallel, described 35th electric capacity, the 36th electric capacity
One end in parallel with the 37th electric capacity is connected with described one end of 32nd inductance and one end of the 33rd inductance respectively,
Other end ground connection in parallel；Described 38th electric capacity, the 39th electric capacity and the 40th electric capacity are in parallel, described 38th electricity
One end of appearance, the 39th electric capacity and the parallel connection of the 40th electric capacity is connected with the other end of described 33rd inductance, and in parallel is another
One end is connected with one end and the active filter of described 34th inductance respectively, another termination of described 34th inductance
Ground；Described 41st electric capacity, the 42nd electric capacity and the 43rd electric capacity are in parallel, described 41st electric capacity, the 42nd
One end of electric capacity and the parallel connection of the 43rd electric capacity is connected with one end of described 34th inductance, other end ground connection in parallel；Institute
One end of one end and described 34th inductance of stating the 32nd resistance is connected, and the other end of described 32nd resistance is respectively
It is connected with the anode of one end, the negative electrode of the 31st diode and the 33rd diode of described 33rd resistance, described
The other end ground connection of the 33rd resistance, the anode of described 31st diode connects with the negative electrode of described 32nd diode
Connect, the plus earth of described 32nd diode, the negative electrode of described 33rd diode and described 34th diode
Anode connect, the minus earth of described 34th diode.
The pure sine wave inverter with filtering pwm signal isolation features the most according to claim 1, it is characterised in that
Described voltage sample module also includes the 8th resistance, the outfan of described voltage comparator also by described 7th resistance with described
One end of 8th resistance connects, and the other end of described 8th resistance is connected with described first voltage source.
The pure sine wave inverter with filtering pwm signal isolation features the most according to claim 2, it is characterised in that
Described voltage conversion circuit includes audion, the 9th resistance and the tenth resistance, the base stage of described audion and described photoelectric coupling
In device, the colelctor electrode of phototriode connects, and the base stage of described audion connects the second voltage source also by described 9th resistance,
The colelctor electrode of described audion connects described second voltage source, the grounded emitter of described audion by described tenth resistance.
The pure sine wave inverter with filtering pwm signal isolation features the most according to claim 3, it is characterised in that
Described smoothed filter circuit includes the 11st resistance, the 12nd resistance, the 13rd resistance, the 3rd electric capacity and the 4th electric capacity；Described
One end of 11st resistance is connected with the colelctor electrode of described audion, and the other end of described 11st resistance is respectively with the described tenth
One end of one end of two resistance and the 3rd electric capacity connects, the other end of described 12nd resistance, one end of the 13rd resistance and the
One end of four electric capacity is all connected with voltage output end, the other end of described 3rd electric capacity, the other end of the 13rd resistance and the 4th electricity
The equal ground connection of the other end held.
The pure sine wave inverter with filtering pwm signal isolation features the most according to claim 4, it is characterised in that
Described voltage sample module also includes the second stabilivolt, and the negative electrode of described second stabilivolt connects described voltage output end, described
The plus earth of the second stabilivolt.
6. according to the pure sine wave inverter with filtering pwm signal isolation features described in claim 1 to 5 any one,
It is characterized in that, also include current sample module and display module, the input of described current sample module and described PWM
Another outfan of module connects, and the outfan of described current sample module is connected with another input of described MCU, described
The outfan of MCU is connected with the input of described display module.
The pure sine wave inverter with filtering pwm signal isolation features the most according to claim 6, it is characterised in that
Also include that output voltage detection module, an input of described output voltage detection module drive another of module with described SPWM
Outfan connects, and another input of described output voltage detection module is connected with the outfan of described sine-wave generator.
The pure sine wave inverter with filtering pwm signal isolation features the most according to claim 1, it is characterised in that
Described rectification circuit includes the first diode, the second diode, the 3rd diode and the 4th diode, described first diode
The negative electrode of anode and the 4th diode is all connected with the live wire of alternating current, the anode of described second diode and the 3rd diode
Negative electrode is all connected with the zero line of alternating current, as described after the negative electrode of described first diode and the negative electrode connection of the second diode
As described rectification after the cathode output end of rectification circuit, the anode of described 3rd diode and the anode connection of the 4th diode
The cathode output end of circuit.
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| CN201610515239.1A CN106160555A (en) | 2016-07-04 | 2016-07-04 | A kind of pure sine wave inverter with filtering pwm signal isolation features |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113824340A (en) * | 2021-10-15 | 2021-12-21 | 厦门市科力电子有限公司 | Over-power linear voltage-regulating switch power supply |
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| CN201985775U (en) * | 2010-12-28 | 2011-09-21 | 温州市新焦点科技电子有限公司 | Pure sine wave inverter |
| CN102628889A (en) * | 2012-04-17 | 2012-08-08 | 东莞市精诚电能设备有限公司 | Voltage sampling circuit |
| CN203206186U (en) * | 2013-03-28 | 2013-09-18 | 北京长城电子装备有限责任公司 | LC filter for boat |
| CN204597915U (en) * | 2015-06-19 | 2015-08-26 | 陈日志 | A kind of pulse width modulation circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985775U (en) * | 2010-12-28 | 2011-09-21 | 温州市新焦点科技电子有限公司 | Pure sine wave inverter |
| CN102628889A (en) * | 2012-04-17 | 2012-08-08 | 东莞市精诚电能设备有限公司 | Voltage sampling circuit |
| CN203206186U (en) * | 2013-03-28 | 2013-09-18 | 北京长城电子装备有限责任公司 | LC filter for boat |
| CN204597915U (en) * | 2015-06-19 | 2015-08-26 | 陈日志 | A kind of pulse width modulation circuit |
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