CN106100415A - A kind of pure sine wave inverter with input isolation features - Google Patents
A kind of pure sine wave inverter with input isolation features Download PDFInfo
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- CN106100415A CN106100415A CN201610513479.8A CN201610513479A CN106100415A CN 106100415 A CN106100415 A CN 106100415A CN 201610513479 A CN201610513479 A CN 201610513479A CN 106100415 A CN106100415 A CN 106100415A
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- 238000002955 isolation Methods 0.000 title claims abstract description 46
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 21
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- 238000001514 detection method Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 7
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- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/257—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with comparison of different reference values with the value of voltage or current, e.g. using step-by-step method
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of pure sine wave inverter with input isolation features, module, LC filtration module, sine-wave generator, MCU and voltage sample module is driven including Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM, the input of input isolation module is connected with an outfan of Power Entry Module, and the outfan of input isolation module is connected with the input of PWM module；Voltage sample module includes rectification circuit, voltage comparator circuit, photoelectrical coupler, voltage conversion circuit and the smoothed filter circuit being sequentially connected with, and voltage comparator circuit includes voltage comparator, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the first electric capacity and the second electric capacity.The present invention be avoided that signal disturbing, ensure instrument gather data accurately, can carry out being effectively isolated, improving sampling precision by control signal and voltage sampling signal.
Description
Technical field
The present invention relates to inverter field, particularly to a kind of pure sine wave inverter with input isolation features.
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.
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 one is avoided that signal
Disturb, ensure that instrument collection data are accurate, can carry out being effectively isolated, improving sampling precision by control signal and voltage sampling signal
Have input isolation features pure sine wave inverter.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of have input isolation features pure
String ripple inverter, drives including Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM
Dynamic model block, LC filtration module, sine-wave generator, MCU and voltage sample module, the input of described input isolation module and institute
The outfan stating Power Entry Module connects, the outfan of described input isolation module and the input of described PWM module
End connects, and the input of described Transformer Rectifier filtration module is connected with the outfan of described PWM module, and described SPWM drives
One input of module is connected with the outfan of described Transformer Rectifier filtration module, and the input of described LC filtration module is with described
SPWM drives the outfan of module to connect, and the input of described sine-wave generator connects with the outfan of described LC filtration module
Connecing, the input of described voltage sample module is connected with another outfan of described Power Entry Module, an input of described MCU
End is connected with the outfan of described voltage sample module；
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 and the second electric capacity, the in-phase input end of described voltage comparator leads to
Cross described 5th resistance to be connected with one end of described first resistance and one end of the second resistance respectively, another of described first resistance
End is connected with the cathode output end of described rectification circuit, and the inverting input of described voltage comparator is divided by described 6th resistance
It is not connected with one end of one end, one end of the 4th resistance and first electric capacity of described 3rd resistance, another of described 3rd resistance
End connect the 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 all with
The cathode output end of described rectification circuit connects, a pin of described voltage comparator respectively with described first voltage source and the
One end of two electric capacity connects, and the other end of described second electric capacity is connected with the cathode output end of described rectification circuit, described voltage
The outfan of comparator is connected with the anode of light emitting diode in described photoelectrical coupler, photosensitive three poles in described photoelectrical coupler
The colelctor electrode of pipe is connected with described voltage conversion circuit.
In the pure sine wave inverter with input isolation features of the present invention, described voltage sample module is also wrapped
Including the 8th resistance, the outfan of described voltage comparator also one end with described 8th resistance is connected, described 8th resistance another
One end is connected with described first voltage source.
In the pure sine wave inverter with input isolation features of the present invention, described voltage conversion circuit includes
Audion, the 9th resistance and the tenth resistance, the base stage of described audion and the current collection of phototriode in described photoelectrical coupler
Pole connects, and the base stage of described audion connects the second voltage source also by described 9th resistance, and the colelctor electrode of described audion leads to
Cross described tenth resistance and connect described second voltage source, the grounded emitter of described audion.
In the pure sine wave inverter with input isolation features of the present invention, described smoothed filter circuit includes
11st resistance, the 12nd resistance, the 13rd resistance, the 3rd electric capacity and the 4th electric capacity；One end of described 11st resistance and institute
The colelctor electrode stating audion connects, and the other end of described 11st resistance is electric with one end of described 12nd resistance and the 3rd respectively
The one end held connects, and one end of the other end, one end of the 13rd resistance and the 4th electric capacity of described 12nd resistance is all connected with electricity
Pressure outfan, the other end, the other end of the 13rd resistance and the equal ground connection of the other end of the 4th electric capacity of described 3rd electric capacity.
In the pure sine wave inverter with input isolation features of the present invention, described voltage sample module is also wrapped
Including stabilivolt, the negative electrode of described stabilivolt connects described voltage output end, the plus earth of described stabilivolt.
Of the present invention have input isolation features pure sine wave inverter in, also include current sample module and
Display module, the input of described current sample module is connected with another outfan of described PWM module, and described electric current is adopted
The outfan of original mold block is connected with another input of described MCU, the outfan of described MCU and the input of described display module
Connect.
In the pure sine wave inverter with input isolation features of the present invention, also include that output voltage detects mould
Block, an input of described output voltage detection module drives another outfan of module to be connected with described SPWM, described output
Another input of voltage detection module is connected with the outfan of described sine-wave generator.
In the pure sine wave inverter with input isolation features of the present invention, described rectification circuit includes first
Diode, the second diode, the 3rd diode and the 4th diode, the anode of described first diode and the moon of the 4th diode
The most all be 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
Connecting, after the negative electrode of described first diode and the negative electrode connection of the second diode, the positive pole as described rectification circuit exports
As the cathode output end of described rectification circuit after end, the anode of described 3rd diode and the anode connection of the 4th diode.
Implement the pure sine wave inverter with input isolation features of the present invention, have the advantages that owing to adopting
Module, LC filtering is driven with Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM
Module, sine-wave generator, MCU and voltage sample module, voltage sample module includes rectification circuit, the voltage ratio being sequentially connected with
Relatively circuit, photoelectrical coupler, voltage conversion circuit and smoothed filter circuit, power supply input can be had by input isolation module
Effect isolation, SPWM changes modulation pulse mode exactly on the basis of PWM, and pulse width time dutycycle presses sine gauge rate row
Arranging, such output waveform can accomplish sinewave output through suitable filtering, and LC filtration module is used for, to harmonic compensation, using
MCU control signal can effectively be isolated by photoelectrical coupler with voltage sampling signal, is avoided that signal disturbing, ensures instrument
Device gather data accurately, can carry out being effectively isolated, improving sampling precision by control signal and voltage sampling signal.
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 structural representation that the present invention has in one embodiment of pure sine wave inverter of input isolation features；
Fig. 2 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 input isolation features, this has input isolation features
The structural representation of pure sine wave inverter is as shown in Figure 1.In Fig. 1, this has the pure sine wave inverter of input isolation features
Including 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, the input of input isolation module 2 and electricity
One outfan of source input module 1 connects, and the outfan of input isolation module 2 is connected with the input of PWM module 3, becomes
The input of pressure rectification filtering module 4 is connected with the outfan of PWM module 3, and SPWM drives an input and the change of module 5
The outfan of pressure rectification filtering module 4 connects, and the input of LC filtration module 6 drives the outfan of module 5 to be connected, just with SPWM
The input of string wave producer 7 is connected with the outfan of LC filtration module 6, and the input of voltage sample module 9 inputs with power supply
Another outfan of module 1 connects, and an input of MCU8 is connected with the outfan of voltage sample module 9.Employing MCU8's is good
Place 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 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 and the second electric capacity C2, the in-phase input end of voltage comparator U2 passes through the 5th resistance
R5 is connected with one end of the first resistance R1 and one end of the second resistance R2 respectively, and the 5th resistance R5 is for voltage comparator U2's
In-phase input end carries out current limliting, and the other end of the first resistance R1 is connected with the cathode output end of rectification circuit, voltage comparator U2
Inverting input by the 6th resistance R6 respectively with one end, one end of the 4th resistance R4 and the first electric capacity C1 of the 3rd resistance R3
One end connect, the 6th resistance for the inverting input of voltage comparator U2 is carried out current limliting, the other end of the 3rd resistance R3
Connect 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
All be connected with the cathode output end of rectification circuit, a pin of voltage comparator U2 respectively with the first voltage source VDD1 and second
One end of electric capacity C2 connects, and the other end of the second electric capacity C2 is connected with the cathode output end of rectification circuit, voltage comparator U2's
Outfan is connected with the anode of light emitting diode in photoelectrical coupler U1, in photoelectrical coupler U1 the colelctor electrode of phototriode with
Voltage conversion circuit connects.By using photoelectrical coupler U1 to isolate, control signal can be had with sampled signal
The isolation of effect, effectively prevent the impact on control signal of the external voltage electrical network, and 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 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.
In the present embodiment, this pure sine wave inverter with input isolation features also includes current sample module 10 and shows
Show that module 11, the input of current sample module 10 are connected with another outfan of PWM module 3, current sample module 10
Outfan be connected with another input of MCU8, the outfan of MCU8 is connected with the input of display module 11.By display
Module 11 can find out voltage and power intuitively.
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 input isolation features is the most normal, can make staff couple
Whole system has to be grasped well.
In the present embodiment, this pure sine wave inverter with input isolation features also includes output voltage detection module
12, an input of output voltage detection module 12 drives another outfan of module 5 to be connected with SPWM, output voltage detection mould
Another input of block 12 is connected with the outfan of sine-wave generator 7.In real time sine-wave generator 7 can be carried out voltage anti-
Feedback, whether detection voltage meets needs, then regulates SPWM and drive module 5 to change pulse, reaches required voltage, say, that
The voltage allowing this pure sine wave inverter with input isolation features finally obtain can meet needs.
In a word, in the present embodiment, this pure sine wave inverter with input isolation features is used in armarium, army
With time on equipment, will not produce the interference of signal, the accuracy of the data that instrument records also is greatly improved.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (8)
1. one kind have input isolation features pure sine wave inverter, it is characterised in that include Power Entry Module, input every
Module, LC filtration module, sine-wave generator, MCU is driven from module, PWM module, Transformer Rectifier filtration module, SPWM
With voltage sample module, the input of described input isolation module is connected with an outfan of described Power Entry Module, described
The outfan of input isolation module is connected with the input of described PWM module, the input of described Transformer Rectifier filtration module
End is connected with the outfan of described PWM module, and described SPWM drives an input of module to filter with described Transformer Rectifier
The outfan of module connects, and the input of described LC filtration module is connected with the outfan of described SPWM driving module, described just
The input of string wave producer is connected with the outfan of described LC filtration module, and the input of described voltage sample module is with described
Another outfan of Power Entry Module connects, and an input of described MCU is connected with the outfan of described voltage sample module；
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 and the second electric capacity, the in-phase input end of described voltage comparator passes through institute
State the 5th resistance to be connected with one end of described first resistance and one end of the second resistance respectively, the other end of described first resistance with
The cathode output end of described rectification circuit connects, the inverting input of described voltage comparator by described 6th resistance respectively with
One end of one end, one end of the 4th resistance and first electric capacity of described 3rd resistance connects, and the other end of described 3rd resistance is even
Connecing the 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 with described
The cathode output end of rectification circuit connects, and a pin of described voltage comparator is electric with described first voltage source and second respectively
The one end held connects, and the other end of described second electric capacity is connected with the cathode output end of described rectification circuit, and described voltage ratio is relatively
The outfan of device is connected with the anode of light emitting diode in described photoelectrical coupler, phototriode in described photoelectrical coupler
Colelctor electrode is connected with described voltage conversion circuit.
The pure sine wave inverter with input isolation features the most according to claim 1, it is characterised in that described voltage
Sampling module also includes the 8th resistance, and the outfan of described voltage comparator also one end with described 8th resistance is connected, described
The other end of the 8th resistance is connected with described first voltage source.
The pure sine wave inverter with input isolation features the most according to claim 2, it is characterised in that 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.
The pure sine wave inverter with input isolation features the most according to claim 3, it is characterised in that 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.
The pure sine wave inverter with input isolation features the most according to claim 4, it is characterised in that 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.
6., according to the pure sine wave inverter with input isolation features that claim 1 to 5 meaning one is described, its feature exists
In, also including current sample module and display module, the input of described current sample module is another with described PWM module
One outfan connects, and the outfan of described current sample module is connected with another input of described MCU, the output of described MCU
End is connected with the input of described display module.
The pure sine wave inverter with input isolation features the most according to claim 6, it is characterised in that 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.
The pure sine wave inverter with input 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, 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.
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| CN201610513479.8A CN106100415A (en) | 2016-07-04 | 2016-07-04 | A kind of pure sine wave inverter with input isolation features |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985775U (en) * | 2010-12-28 | 2011-09-21 | 温州市新焦点科技电子有限公司 | Pure sine wave inverter |
| CN102628889A (en) * | 2012-04-17 | 2012-08-08 | 东莞市精诚电能设备有限公司 | Voltage sampling circuit |
| CN204119046U (en) * | 2014-10-17 | 2015-01-21 | 智造节能科技（苏州）有限公司 | A kind of high frequency chopping sinusoidal wave output circuit |
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2016
- 2016-07-04 CN CN201610513479.8A patent/CN106100415A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985775U (en) * | 2010-12-28 | 2011-09-21 | 温州市新焦点科技电子有限公司 | Pure sine wave inverter |
| CN102628889A (en) * | 2012-04-17 | 2012-08-08 | 东莞市精诚电能设备有限公司 | Voltage sampling circuit |
| CN204119046U (en) * | 2014-10-17 | 2015-01-21 | 智造节能科技（苏州）有限公司 | A kind of high frequency chopping sinusoidal wave output circuit |
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