CN106160553A - A kind of pure sine wave inverter with pulse width modulation electrical current sampling isolation features - Google Patents
A kind of pure sine wave inverter with pulse width modulation electrical current sampling isolation features Download PDFInfo
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- CN106160553A CN106160553A CN201610513699.0A CN201610513699A CN106160553A CN 106160553 A CN106160553 A CN 106160553A CN 201610513699 A CN201610513699 A CN 201610513699A CN 106160553 A CN106160553 A CN 106160553A
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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
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- 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
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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
- 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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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of pure sine wave inverter with pulse width modulation electrical current sampling isolation features, drive module, LC filtration module, sine-wave generator, MCU and current sample module including Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM；PWM module includes that time base circuit chip, the 21st resistance are to the 30th resistance, the 21st electric capacity to the 28th electric capacity, the 11st diode to the 13rd diode, the 11st audion and the 12nd metal-oxide-semiconductor；Current sample module includes that the first shunting metal-oxide-semiconductor, the second sampling metal-oxide-semiconductor control resistance to the 4th sampling metal-oxide-semiconductor, sampling resistor, the first control resistance and second.The present invention be avoided that signal disturbing, ensure instrument gather data accurately, power supply input can be effectively isolated, circuit design structure is simple, powerful, use flexibly, the scope of application is relatively wide, can realize the sample detecting of multiple current value.
Description
Technical field
The present invention relates to inverter field, particularly to a kind of pure sinusoid with pulse width modulation electrical current sampling isolation features
Ripple inverter.
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.
PWM controls technology and controls simple with it, flexibly and the good advantage of dynamic response and to become Power Electronic Technique the widest
The control mode of general application, is also the focuses studied of people.Due to the development of current science and technology without subject between
Boundary, in conjunction with modern control theory thought or realize resonance free ripple switching technique will become PWM control technology development master
Want one of direction.Pulse width modulation is a kind of analog control mode, and it carrys out modulation transistor base according to the change of respective loads
Pole or the biasing of metal-oxide-semiconductor grid, realize transistor or the change of metal-oxide-semiconductor ON time, thus it be defeated to realize switching power supply
The change gone out.This mode can make the output voltage of power supply keep constant when operation conditions change, utilizes microprocessor
The very effective technology of one that analog circuit is controlled by digital signal.But existing pwm control circuit design structure is multiple
Miscellaneous, use underaction, the scope of application is narrower.
It addition, in integrated circuits, especially in Analogous Integrated Electronic Circuits, in order to detect big electric current because power consumption etc. want
Ask, detect again after needing electric current is sampled.And the sampling of usual electric current can only have a kind of sampled value.Because can only adopt
Sample one electric current, so the current value that it can be detected by is a kind of, is not easy to realize the sample detecting of multiple current value.
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 one is avoided that signal
Interference, ensure instrument gather data accurately, power supply input can be effectively isolated, circuit design structure is simple, powerful,
Use flexibly, the scope of application is relatively wide, can realize multiple current value sample detecting there is pulse width modulation electrical current sampling isolation merit
The pure sine wave inverter of energy.
The technical solution adopted for the present invention to solve the technical problems is: structure one have pulse width modulation electrical current sampling every
From the pure sine wave inverter of function, including Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtering
Module, SPWM drive module, LC filtration module, sine-wave generator, MCU and current sample module, described input isolation module
Input be connected with an outfan of described Power Entry Module, the outfan of described input isolation module and described PWM adjust
The input of molding block connects, and the input of described Transformer Rectifier filtration module is connected with the outfan of described PWM module,
Described SPWM drives an input of module to be connected with the outfan of described Transformer Rectifier filtration module, described LC filtration module
Input drives the outfan of module to be connected with described SPWM, the input of described sine-wave generator and described LC filtration module
Outfan connect, the input of described current sample module is connected with another outfan of described PWM module, described electricity
The outfan of stream sampling module is connected with another input of described MCU；
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 current sample module includes the first shunting metal-oxide-semiconductor, the second sampling metal-oxide-semiconductor, the 3rd sampling metal-oxide-semiconductor, the 4th adopts
Sample metal-oxide-semiconductor, sampling resistor, the first control resistance and second control resistance, the grid of described first shunting metal-oxide-semiconductor and the second sampling
The grid of metal-oxide-semiconductor is all connected with input power, the described first shunting drain electrode of metal-oxide-semiconductor, the second sampling drain electrode of metal-oxide-semiconductor, the 3rd adopts
The drain electrode of the drain electrode of sample metal-oxide-semiconductor and the 4th sampling metal-oxide-semiconductor is all connected with current input pin, the source electrode of described first shunting metal-oxide-semiconductor
Ground connection, the source electrode of the described second sampling source electrode of metal-oxide-semiconductor, the source electrode of the 3rd sampling metal-oxide-semiconductor and the 4th sampling metal-oxide-semiconductor is all with described
One end of sampling resistor connects, and one end of described sampling resistor is also connected with sampled voltage outfan, another of described sampling resistor
End ground connection, the grid of described 3rd sampling metal-oxide-semiconductor controls resistance by described first and connects the first external signal input pin, institute
The grid stating the 4th sampling metal-oxide-semiconductor connects the second external signal input pin by described second control resistance.
In the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, also include electricity
Pressure sampling module and display module, the input of described voltage sample module connects with another outfan of described Power Entry Module
Connecing, an input of described MCU is connected with the outfan of described voltage sample module, the outfan of described MCU and described display
The input of module connects.
In the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, described voltage
Sampling module includes rectification circuit, voltage comparator circuit, photoelectrical coupler, voltage conversion circuit and the smothing filtering being sequentially connected with
Circuit；Described voltage comparator circuit include voltage comparator, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th
Resistance, the 6th resistance, the 7th resistance, the first electric capacity and the second electric capacity, the in-phase input end of described voltage comparator is by described
5th resistance is connected with one end of described first resistance and one end of the second resistance respectively, the other end of described first resistance and institute
State rectification circuit cathode output end connect, the inverting input of described voltage comparator by described 6th resistance respectively with institute
The one end stating one end of the 3rd resistance, one end of the 4th resistance and the first electric capacity connects, and the other end of described 3rd resistance connects
First voltage source, the other end of the other end of described second resistance, the other end of the 4th resistance and the first electric capacity is all whole with described
The cathode output end of current circuit connects, a pin of described voltage comparator respectively with described first voltage source and the second electric capacity
One end connect, the other end of described second electric capacity is connected with the cathode output end of described rectification circuit, described voltage comparator
Outfan be connected with the anode of light emitting diode in described photoelectrical coupler by described 7th resistance, described photoelectrical coupler
The colelctor electrode of middle phototriode is connected with described voltage conversion circuit.
In the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, described voltage
Sampling module also includes the 8th resistance, and the outfan of described voltage comparator is also by described 7th resistance and described 8th resistance
One end connect, the other end of described 8th resistance is connected with described first voltage source.
In the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, described voltage
Change-over circuit includes audion, the 9th resistance and the tenth resistance, and the base stage of described audion is photosensitive with described photoelectrical coupler
The colelctor electrode of audion connects, and the base stage of described audion connects the second voltage source, described three poles also by described 9th resistance
The colelctor electrode of pipe connects described second voltage source, the grounded emitter of described audion by described tenth resistance.
In the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, described smooth
Filter circuit includes the 11st resistance, the 12nd resistance, the 13rd resistance, the 3rd electric capacity and the 4th electric capacity；Described 11st electricity
Resistance one end be connected with the colelctor electrode of described audion, the other end of described 11st resistance respectively with described 12nd resistance
One end of one end and the 3rd electric capacity connects, the other end, one end of the 13rd resistance and the 4th electric capacity of described 12nd resistance
One end is all connected with voltage output end, another of the other end, the other end of the 13rd resistance and the 4th electric capacity of described 3rd electric capacity
Hold equal ground connection.
In the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, described voltage
Sampling module also includes stabilivolt, and the negative electrode of described stabilivolt connects described voltage output end, the plus earth of described stabilivolt.
In the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, also include defeated
Going out voltage detection module, an input of described output voltage detection module and described SPWM drive another outfan of module even
Connecing, 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 pulse width modulation electrical current sampling isolation features of the present invention, described rectification
Circuit includes the first diode, the second diode, the 3rd diode and the 4th diode, the anode of described first diode and
The negative electrode of four diodes 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
The zero line of alternating current connects, as described rectification circuit after the negative electrode of described first diode and the negative electrode connection of the second diode
Cathode output end, the anode of the anode of described 3rd diode and the 4th diode connect after negative as described rectification circuit
Pole outfan.
Implement the pure sine wave inverter with pulse width modulation electrical current sampling isolation features of the present invention, have following useful
Effect: owing to using Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM to drive
Module, LC filtration module, sine-wave generator, MCU and current sample module, the circuit structure of PWM module is simple, electric current
Sampling module include the first shunting metal-oxide-semiconductor, second sampling metal-oxide-semiconductor, the 3rd sampling metal-oxide-semiconductor, the 4th sampling metal-oxide-semiconductor, sampling resistor,
First control resistance and second control resistance, input isolation module can to power supply input be effectively isolated, SPWM be exactly
Changing modulation pulse mode on the basis of PWM, pulse width time dutycycle presses the arrangement of sine gauge rate, such output waveform warp
Crossing suitable filtering and can accomplish sinewave output, LC filtration module is used for harmonic compensation, uses current sample module permissible
Realize the sample detecting of multiple current value, so it is avoided that signal disturbing, ensures that instrument collection data are accurate, 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, can realize multiple electric current
The sample detecting of value.
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 in one embodiment of pure sine wave inverter that the present invention has pulse width modulation electrical current sampling isolation features
Structural representation；
Fig. 2 is the circuit theory diagrams of PWM module in described embodiment；
Fig. 3 is the circuit theory diagrams of current sample module in described embodiment；
Fig. 4 is the circuit theory diagrams of voltage sample 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 pulse width modulation electrical current sampling isolation features, this has arteries and veins
The structural representation of the pure sine wave inverter of wide modulation current sample isolation features is as shown in Figure 1.In Fig. 1, this has pulsewidth
The pure sine wave inverter of modulation current sample isolation features includes Power Entry Module 1, input isolation module 2, PWM mould
Block 3, Transformer Rectifier filtration module 4, SPWM drive module 5, LC filtration module 6, sine-wave generator 7, MCU8 and current sample
Module 10, wherein, the input of input isolation module 2 is connected with an outfan of Power Entry Module 1, inputs isolation module 2
Outfan be connected with the input of PWM module 3, the input of Transformer Rectifier filtration module 4 and PWM module 3
Outfan connects, and SPWM drives an input of module 5 to be connected with the outfan of Transformer Rectifier filtration module 4, LC filtration module 6
Input and SPWM drive the outfan of module 5 to be connected, the input of sine-wave generator 7 and the output of LC filtration module 6
End connects, and the input of current sample module 10 is connected with another outfan of PWM module 3, current sample module 10
Outfan is connected with another input of MCU8.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 to be formed by combining by inductance, electric capacity and resistance, is used for carrying out harmonic wave benefit
Repay.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 wider, 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 current sample module in the present embodiment, and in the present embodiment, current sample module 10 includes
First shunting metal-oxide-semiconductor M1, the second sampling metal-oxide-semiconductor M2, the 3rd sampling metal-oxide-semiconductor M3, the 4th sampling metal-oxide-semiconductor M4, sampling resistor Rs, the
One controls resistance Ra and second controls resistance Rb, and first controls resistance Ra and second control resistance Rb is used for current limliting, in case stopping loss
Bad 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4.It is noted that in the present embodiment, the first shunting metal-oxide-semiconductor M1, the
Two sampling metal-oxide-semiconductor M2, the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 are P-channel metal-oxide-semiconductor, certainly, at the present embodiment
Certain situation under, first shunting metal-oxide-semiconductor M1, second sampling metal-oxide-semiconductor M2, the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4
N-channel MOS pipe can also be used, but at this moment circuit structure also to be changed.
In the present embodiment, the grid of the first shunting metal-oxide-semiconductor M1 and the grid of the second sampling metal-oxide-semiconductor M2 are all connected with input power
Vin, therefore the first shunting metal-oxide-semiconductor M1 and the second sampling metal-oxide-semiconductor M2 is in normally on, for fixing access state, first point
The stream drain electrode of metal-oxide-semiconductor M1, the second sampling drain electrode of metal-oxide-semiconductor M2, the drain electrode of the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4
Drain electrode be all connected with current input pin Ps, the source ground of the first shunting metal-oxide-semiconductor M1, the source electrode of the second sampling metal-oxide-semiconductor M2, the
The source electrode of the three sampling source electrodes of metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 all one end with sampling resistor Rs are connected, sampling resistor Rs
One end be also connected with sampled voltage outfan Vs, the other end ground connection of sampling resistor Rs, the 3rd sampling metal-oxide-semiconductor M3 grid pass through
First controls resistance Ra connects the first external signal input pin A, and the grid of the 4th sampling metal-oxide-semiconductor M4 is by the second control resistance
Rb connects the second external signal input pin B.So can be achieved with multiple cut-off current, and implementation is relatively simple.
In the present embodiment, the conducting state of the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 is outside by first respectively
Signal input tube foot A and the second external signal input pin B is controlled.When the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor
When the signal of M4 is high level, the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 conducting, during for low level, the 3rd adopts
Sample metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 cut-off.Control the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor according to actual needs
The conducting state of M4.
Because the grid of the first shunting metal-oxide-semiconductor M1 and the second sampling metal-oxide-semiconductor M2 are in normally on, current input pin
Electric current in Ps flows through grid and the second sampling metal-oxide-semiconductor M2 of the first shunting metal-oxide-semiconductor M1, flows through the electricity of the first shunting metal-oxide-semiconductor M1
Stream directly arrives ground, and the electric current flowing through the second sampling metal-oxide-semiconductor M2 flows into sampling resistor Rs, as the first external signal input pin A
When the 3rd sampling metal-oxide-semiconductor M3 being controlled with the second external signal input pin B and/or the 4th sampling metal-oxide-semiconductor M4 conducting, electricity
After electric current in stream input pin Ps flows through them, flow into sampling resistor Rs.The electric current flowed into produces voltage at sampling resistor Rs
Exported to subsequent conditioning circuit by sampled voltage outfan Vs afterwards.
In the present embodiment, the first shunting metal-oxide-semiconductor M1, the second sampling metal-oxide-semiconductor M2, the 3rd sampling metal-oxide-semiconductor M3, the 4th sampling
Metal-oxide-semiconductor M4 is arranged with certain size.Depending on set ratio value is according to the concrete condition of circuit.Outside by first
3rd sampling metal-oxide-semiconductor M3 and/or the 4th sampling metal-oxide-semiconductor M4 is led by signal input tube foot A and the second external signal input pin B
Logical state is controlled, and can lead to the second sampling metal-oxide-semiconductor M2, the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 obtains difference
Sample rate current, therefore the most just can produce different sampled voltages by sampling resistor Rs.Second sampling metal-oxide-semiconductor M2, the 3rd
It is the most that sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 turns on, and the electric current of sampling is the biggest, and the sampled voltage of generation is the biggest.
Time maximum it is the second sampling metal-oxide-semiconductor M2, the 3rd sampling metal-oxide-semiconductor M3 and the 4th sampling metal-oxide-semiconductor M4 all turns on.
In the present embodiment, this pure sine wave inverter with pulse width modulation electrical current sampling isolation features also includes that voltage is adopted
Original mold block 91 and display module 11, the input of voltage sample module 9 is connected with another outfan of Power Entry Module 1,
One input of MCU8 is connected with the outfan of voltage sample module 9.By display module 11 can find out intuitively voltage and
Power.
Fig. 4 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 and the second electric capacity C2, the in-phase input end of voltage comparator U2
Being connected with one end of the first resistance R1 and one end of the second resistance R2 respectively by the 5th resistance R5, the 5th resistance R5 is for electricity
The in-phase input end of pressure comparator U2 carries out current limliting, and the other end of the first resistance R1 is connected with the cathode output end of rectification circuit,
The inverting input of voltage comparator U2 by the 6th resistance R6 respectively with one end, one end of the 4th resistance R4 of the 3rd resistance R3
Connecting with one end of the first electric capacity C1, the 6th resistance is for carrying out current limliting to the inverting input of voltage comparator U2, and the 3rd is electric
The other end of resistance R3 connects the first voltage source VDD1, the other end of the second resistance R2, the other end of the 4th resistance R4 and the first electricity
Hold C1 the other end be all connected with the cathode output end of rectification circuit, a pin of voltage comparator U2 respectively with the first voltage
One end of source VDD1 and the second electric capacity C2 connects, and the other end of the second electric capacity C2 is connected with the cathode output end of rectification circuit, electricity
The outfan of pressure comparator U2 is connected by the anode of light emitting diode in the 7th resistance R7 and photoelectrical coupler U1, the 7th resistance
R7 is for carrying out current limliting to the outfan of voltage comparator U2, and in photoelectrical coupler U1, the colelctor electrode of phototriode turns with voltage
Change circuit to connect.By using photoelectrical coupler U1 to isolate, control signal and sampled signal can be carried out effectively every
From, effectively prevent 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 stabilivolt ZD1, is equivalent to the outfan stabilivolt ZD1 in parallel at smoothed filter circuit, stabilivolt
The negative electrode of ZD1 connects voltage output end Vo, the plus earth of stabilivolt ZD1.By the voltage output end Vo of smoothed filter circuit with
One input of MCU8 connects, and makes smoothed filtered voltage sampling signal deliver to MCU8 process, and MCU8 just can basis
The obtained corresponding instruction of sampled signal output, protects electric equipment 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.
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 pulse width modulation electrical current sampling isolation features is the most normal, permissible
Make staff that whole system to be had to grasp well.
In the present embodiment, this pure sine wave inverter with pulse width modulation electrical current sampling isolation features also includes output electricity
Pressure detection module 12, an input of output voltage detection module 12 drives another outfan of module 5 to be connected with SPWM, output
Another input of voltage detection module 12 is connected with the outfan of sine-wave generator 7.Can be in real time to sine-wave generator 7
Carrying out Voltage Feedback, whether detection voltage meets needs, then regulates SPWM and drive module 5 to change pulse, reaches the electricity needed
Pressure, say, that the voltage allowing this pure sine wave inverter with pulse width modulation electrical current sampling isolation features finally obtain can be full
Foot needs.
In a word, in the present embodiment, this pure sine wave inverter with pulse width modulation electrical current sampling isolation features is used
Time on armarium, military equipment, will not produce the interference of signal, the accuracy of the data that instrument records also obtains the biggest
Improve.
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 (9)
1. a pure sine wave inverter with pulse width modulation electrical current sampling isolation features, it is characterised in that include that power supply is defeated
Enter module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM drive module, LC filtration module, sine
Wave producer, MCU and current sample module, the input of described input isolation module and an output of described Power Entry Module
End connects, and the outfan of described input isolation module is connected with the input of described PWM module, and described Transformer Rectifier filters
The input of module is connected with the outfan of described PWM module, and described SPWM drives an input of module and described change
The outfan of pressure rectification filtering module connects, and the input of described LC filtration module and described SPWM drive the outfan of module even
Connecing, the input of described sine-wave generator is connected with the outfan of described LC filtration module, described current sample module defeated
Enter end to be connected with another outfan of described PWM module, another of the outfan of described current sample module and described MCU
Input 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 current sample module includes the first shunting metal-oxide-semiconductor, the second sampling metal-oxide-semiconductor, the 3rd sampling metal-oxide-semiconductor, the 4th sampling MOS
Pipe, sampling resistor, the first control resistance and second control resistance, the grid of described first shunting metal-oxide-semiconductor and the second sampling metal-oxide-semiconductor
Grid be all connected with input power, the described first shunting drain electrode of metal-oxide-semiconductor, the second sampling drain electrode of metal-oxide-semiconductor, the 3rd sampling MOS
The drain electrode of the drain electrode of pipe and the 4th sampling metal-oxide-semiconductor is all connected with current input pin, and described first shunts the source ground of metal-oxide-semiconductor,
The source electrode of the described second sampling source electrode of metal-oxide-semiconductor, the 3rd sampling source electrode of metal-oxide-semiconductor and the 4th sampling metal-oxide-semiconductor all with described sampling
One end of resistance connects, and one end of described sampling resistor is also connected with sampled voltage outfan, another termination of described sampling resistor
Ground, the grid of described 3rd sampling metal-oxide-semiconductor connects the first external signal input pin by described first control resistance, and described the
The grid of four sampling metal-oxide-semiconductors controls resistance by described second and connects the second external signal input pin.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 1, its feature
It is, also includes voltage sample module and display module, the input of described voltage sample module and described Power Entry Module
Another outfan connect, an input of described MCU is connected with the outfan of described voltage sample module, and described MCU's is defeated
Go out end to be connected with the input of described display module.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 2, its feature
Being, described voltage sample module includes that the rectification circuit being sequentially connected with, voltage comparator circuit, photoelectrical coupler, voltage are changed
Circuit and smoothed filter circuit；Described voltage comparator circuit include voltage comparator, the first resistance, the second resistance, the 3rd resistance,
4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electric capacity and the second electric capacity, the homophase of described voltage comparator is defeated
Enter end to be connected with one end of described first resistance and one end of the second resistance respectively by described 5th resistance, described first resistance
The other end be connected with the cathode output end of described rectification circuit, the inverting input of described voltage comparator pass through the described 6th
Resistance one end with one end, one end of the 4th resistance and first electric capacity of described 3rd resistance respectively is connected, described 3rd resistance
The other end connect the first voltage source, another of the other end of described second resistance, the other end of the 4th resistance and the first electric capacity
End all cathode output ends with described rectification circuit are connected, a pin of described voltage comparator respectively with described first voltage
One end of source and the second electric capacity connects, and the other end of described second electric capacity is connected with the cathode output end of described rectification circuit, institute
The outfan stating voltage comparator is connected with the anode of light emitting diode in described photoelectrical coupler by described 7th resistance, institute
State the colelctor electrode of phototriode in photoelectrical coupler to be connected with described voltage conversion circuit.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 3, its feature
Being, described voltage sample module also includes the 8th resistance, and the outfan of described voltage comparator is also by described 7th resistance
Being connected with one end of described 8th resistance, the other end of described 8th resistance is connected with described first voltage source.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 4, its feature
Being, described voltage conversion circuit includes audion, the 9th resistance and the tenth resistance, the base stage of described audion and described photoelectricity
In bonder, the colelctor electrode of phototriode connects, and the base stage of described audion connects the second voltage also by described 9th resistance
Source, the colelctor electrode of described audion connects described second voltage source by described tenth resistance, and the emitter stage of described audion connects
Ground.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 5, its feature
Being, 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 described
One end of 12nd resistance and one end of the 3rd electric capacity connect, the other end of described 12nd resistance, one end of the 13rd resistance
It is all connected with voltage output end, the other end of described 3rd electric capacity, the other end of the 13rd resistance and with one end of the 4th electric capacity
The equal ground connection of the other end of four electric capacity.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 6, its feature
Being, described voltage sample module also includes stabilivolt, and the negative electrode of described stabilivolt connects described voltage output end, described voltage stabilizing
The plus earth of pipe.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 7, its feature
It is, also includes that output voltage detection module, an input of described output voltage detection module drive module with described SPWM
Another outfan connect, the outfan of another input of described output voltage detection module and described sine-wave generator is even
Connect.
The pure sine wave inverter with pulse width modulation electrical current sampling isolation features the most according to claim 1, its feature
Being, described rectification circuit includes the first diode, the second diode, the 3rd diode and the 4th diode, the described 1st
The anode of pole pipe and the negative electrode of the 4th diode are all connected with the live wire of alternating current, the anode and the three or two of described second diode
The negative electrode of pole pipe is all connected with the zero line of alternating current, and the negative electrode of described first diode and the negative electrode of the second diode are made after connecting
As institute after connecting for the cathode output end of described rectification circuit, the anode of described 3rd diode and the anode of the 4th diode
State the cathode output end of rectification circuit.
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| CN201610513699.0A CN106160553A (en) | 2016-07-04 | 2016-07-04 | A kind of pure sine wave inverter with pulse width modulation electrical current sampling isolation features |
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| CN201610513699.0A CN106160553A (en) | 2016-07-04 | 2016-07-04 | A kind of pure sine wave inverter with pulse width modulation electrical current sampling isolation features |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109975723A (en) * | 2019-04-30 | 2019-07-05 | 南京桐润新能源有限公司 | A kind of isolated original edge voltage sample circuit and its method |
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| CN203798886U (en) * | 2013-12-01 | 2014-08-27 | 陕西易阳科技有限公司 | Current sampling circuit |
| CN204597915U (en) * | 2015-06-19 | 2015-08-26 | 陈日志 | A kind of pulse width modulation circuit |
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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 |
| CN203798886U (en) * | 2013-12-01 | 2014-08-27 | 陕西易阳科技有限公司 | Current sampling circuit |
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