CN106059370A - Pure sine wave inverter with pulse width modulation, voltage stabilization and isolation functions - Google Patents
Pure sine wave inverter with pulse width modulation, voltage stabilization and isolation functions Download PDFInfo
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- CN106059370A CN106059370A CN201610513828.6A CN201610513828A CN106059370A CN 106059370 A CN106059370 A CN 106059370A CN 201610513828 A CN201610513828 A CN 201610513828A CN 106059370 A CN106059370 A CN 106059370A
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- 238000002955 isolation Methods 0.000 title claims abstract description 44
- 230000006641 stabilisation Effects 0.000 title abstract 2
- 238000011105 stabilization Methods 0.000 title abstract 2
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims abstract description 27
- 230000009466 transformation Effects 0.000 claims abstract 2
- 239000004065 semiconductor Substances 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 12
- 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
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000005070 sampling Methods 0.000 abstract description 21
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 abstract 2
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- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 3
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- 238000000465 moulding Methods 0.000 description 1
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- 230000010349 pulsation Effects 0.000 description 1
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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
-
- 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
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a pure sine wave inverter with pulse width modulation, voltage stabilization and isolation functions. The pure sine wave inverter comprises a power input module, an input isolating module, a PWM modulation module, a transformation/rectification/filtering module, an SPWM driving module, an LC filtering module, a sine wave generator, an MCU and a voltage sampling module. The PWM modulation module comprises a time-base circuit chip, a twenty-first resistor, ..., a thirtieth resistor, a twenty-first capacitor, ..., a twenty-eighth capacitor, an eleventh diode, a twelfth diode, a thirteenth diode, an eleventh triode and a twelfth MOS tube. The voltage sampling module comprises a voltage comparing circuit. The voltage comparing circuit comprises a voltage comparator, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first voltage stabilizing tube. The pure sine wave inverter can effectively isolate power input and furthermore has advantages of simple circuit structure, strong function, high flexibility in use, relatively wide application range, effective signal interference prevention, high accuracy of data acquired by an instrument, effective isolation between a control signal and a voltage sampling signal, and effective sampling precision improvement.
Description
Technical field
The present invention relates to inverter field, inverse particularly to a kind of pure sine wave with pulsewidth modulation voltage stabilizing isolation features
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.
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 wider, be avoided that signal dry
Disturb, ensure that instrument collection data are accurate, can carry out being effectively isolated, improving sampling precision by control signal and voltage sampling signal
There is the pure sine wave inverter of pulsewidth modulation voltage stabilizing isolation features.
The technical solution adopted for the present invention to solve the technical problems is: structure one has pulsewidth modulation voltage stabilizing 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 first electric capacity, the second electric capacity and the first stabilivolt, described voltage comparator
In-phase input end is connected with one end of described first resistance and one end of the second resistance respectively by described 5th resistance, and described the
The other end of one resistance is connected with the cathode output end of described rectification circuit, and the inverting input of described voltage comparator passes through institute
State the 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, described
The other end of three resistance connects the first voltage source, the other end of described second resistance, the other end of the 4th resistance and the first electric capacity
The other end all cathode output ends with described rectification circuit be connected, a pin of described voltage comparator is respectively with described
One end of one voltage source and the second electric capacity connects, and the other end of described second electric capacity connects with the cathode output end of described rectification circuit
Connect, the outfan of described voltage comparator respectively with light emitting diode in the negative electrode of described first stabilivolt and photoelectrical coupler
Anode connects, and the anode of described first stabilivolt is connected with the cathode output end of described rectification circuit, in described photoelectrical coupler
The colelctor electrode of phototriode is connected with described voltage conversion circuit.
In the pure sine wave inverter with pulsewidth modulation voltage stabilizing isolation features of the present invention, described voltage sample
Module also includes the 8th resistance, and the outfan of described voltage comparator also one end with described 8th resistance is connected, the described 8th
The other end of resistance is connected with described first voltage source.
In the pure sine wave inverter with pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing isolation features of the present invention, there is following useful effect
Really: owing to using Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM to drive mould
Block, LC filtration module, sine-wave generator, MCU and voltage sample module, the circuit structure of PWM module is simple, and voltage is adopted
Original mold block includes rectification circuit, voltage comparator circuit, photoelectrical coupler, voltage conversion circuit and the smooth filtered electrical being sequentially connected with
Road, voltage comparator circuit include voltage comparator, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance,
Six resistance, the first electric capacity, the second electric capacity and the first stabilivolt, the first stabilivolt is for the electricity to the output of voltage comparator outfan
Pressure signal carries out voltage stabilizing, and power supply input can be effectively isolated by input isolation module, and SPWM changes exactly on the basis of PWM
Having become modulation pulse mode, pulse width time dutycycle presses the arrangement of sine gauge rate, and such output waveform is through suitable filtering
Can accomplish sinewave output, LC filtration module is used for harmonic compensation, use photoelectrical coupler can by MCU control signal with
Voltage sampling signal is effectively isolated, thus its power supply input can be effectively isolated, circuit design structure is simple, merit
Can powerful, use flexibly, the scope of application is wider, be avoided that signal disturbing, ensure instrument gather data accurately, can be by control signal
Carry out with voltage sampling signal being effectively isolated, improving sampling precision.
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 pulsewidth modulation voltage stabilizing 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.
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 pulsewidth modulation voltage stabilizing isolation features, this has pulsewidth and adjusts
The structural representation of the pure sine wave inverter of voltage stabilizing isolation features processed is as shown in Figure 1.In Fig. 1, this has pulsewidth modulation voltage stabilizing
The pure sine wave inverter of isolation features includes Power Entry Module 1, input isolation module 2, PWM module 3, Transformer Rectifier
Filtration module 4, SPWM drive module 5, LC filtration module 6, sine-wave generator 7, MCU8 and voltage sample module 9, wherein, defeated
One outfan of the input and Power Entry Module 1 that enter isolation module 2 is connected, and the outfan of input isolation module 2 is adjusted with PWM
The input of molding block 3 connects, and the input of Transformer Rectifier filtration module 4 is connected with the outfan of PWM module 3, SPWM
The input driving module 5 is connected with the outfan of Transformer Rectifier filtration module 4, the input of LC filtration module 6 and SPWM
The outfan driving module 5 connects, and the input of sine-wave generator 7 is connected with the outfan of LC filtration module 6, voltage sample
The input of module 9 is connected with another outfan of Power Entry Module 1, an input of MCU8 and voltage sample module 9
Outfan 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 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 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 first electric capacity C1, the second electric capacity C2 and the first stabilivolt ZD1, the homophase input of voltage comparator U2
End 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 is for right
The in-phase input end of voltage comparator U2 carries out current limliting, and the other end of the first resistance R1 connects with the cathode output end of rectification circuit
Connect, the inverting input of voltage comparator U2 by the 6th resistance R6 respectively with one end of the 3rd resistance R3, the 4th resistance R4
One end of one end and the first electric capacity C1 connects, and the 6th resistance R6 is used for the inverting input of voltage comparator U2 is carried 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 other end of the 4th resistance R4 and
The other end of the first electric capacity C1 is all connected with the cathode output end of rectification circuit, and a pin of voltage comparator U2 is respectively with
One end of one voltage source VDD1 and the second electric capacity C2 connects, and the other end of the second electric capacity C2 connects with the cathode output end of rectification circuit
Connect, the outfan of voltage comparator U2 respectively with light emitting diode in the negative electrode of the first stabilivolt ZD1 and photoelectrical coupler U1
Anode connects, and the anode of the first stabilivolt ZD1 is connected with the cathode output end of rectification circuit, and the first stabilivolt ZD1 is for electricity
The voltage signal of the outfan output of pressure comparator U2 carries out voltage stabilizing, the colelctor electrode of phototriode and electricity in photoelectrical coupler U1
Voltage conversion circuit connects.By using photoelectrical coupler U1 to isolate, control signal and sampled signal can be carried out effectively
Isolation, 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 with the 8th
One end of 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing isolation features finally obtain can meet needs.
In a word, in the present embodiment, this pure sine wave inverter with pulsewidth modulation voltage stabilizing isolation features is used in doctor
Treatment equipment, time on military equipment, will not produce the interference of signal, and the accuracy of the data that instrument records also obtains the biggest proposing
High.
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 pulsewidth modulation voltage stabilizing 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 first electric capacity, the second electric capacity and the first stabilivolt, 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
State the outfan of voltage comparator respectively with the anode of light emitting diode in the negative electrode of described first stabilivolt and photoelectrical coupler
Connecting, the anode of described first stabilivolt is connected with the cathode output end of described rectification circuit, photosensitive in described photoelectrical coupler
The colelctor electrode of audion is connected with described voltage conversion circuit.
The pure sine wave inverter with pulsewidth modulation voltage stabilizing isolation features the most according to claim 1, it is characterised in that
Described voltage sample module also includes the 8th resistance, and the outfan of described voltage comparator is also with one end of described 8th resistance even
Connecing, the other end of described 8th resistance is connected with described first voltage source.
The pure sine wave inverter with pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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 pulsewidth modulation voltage stabilizing 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201610513828.6A CN106059370A (en) | 2016-07-04 | 2016-07-04 | Pure sine wave inverter with pulse width modulation, voltage stabilization and isolation functions |
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| CN201610513828.6A CN106059370A (en) | 2016-07-04 | 2016-07-04 | Pure sine wave inverter with pulse width modulation, voltage stabilization and isolation functions |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107127422A (en) * | 2017-07-07 | 2017-09-05 | 兰州理工大学技术工程学院 | A kind of arc welder power source of High Power Factor technology |
| CN107347172A (en) * | 2017-08-31 | 2017-11-14 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 500W+500W (DSP) power amplifier module |
| CN113365384A (en) * | 2021-05-12 | 2021-09-07 | 上海交通大学 | Automatic dimming circuit and lighting system using same |
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| CN102628889A (en) * | 2012-04-17 | 2012-08-08 | 东莞市精诚电能设备有限公司 | Voltage 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 |
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| CN107347172A (en) * | 2017-08-31 | 2017-11-14 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 500W+500W (DSP) power amplifier module |
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| CN113365384A (en) * | 2021-05-12 | 2021-09-07 | 上海交通大学 | Automatic dimming circuit and lighting system using same |
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