CN106160559A - There is the pure sine wave inverter of high frequency chopping current sample input isolation features - Google Patents
There is the pure sine wave inverter of high frequency chopping current sample input isolation features Download PDFInfo
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- CN106160559A CN106160559A CN201610531932.8A CN201610531932A CN106160559A CN 106160559 A CN106160559 A CN 106160559A CN 201610531932 A CN201610531932 A CN 201610531932A CN 106160559 A CN106160559 A CN 106160559A
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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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- 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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- 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 high frequency chopping current sample input isolation features, drive module, LC filtration module, sine-wave generator, MCU, voltage sample module, current sample module and display module including Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM；Sine-wave generator includes the first to the second reverse blocking IGBT, the 3rd to the 4th continued flow tube, the 16th resistance, the first inductance and the 6th filter capacitor；Voltage sample module includes voltage comparator circuit and photoelectrical coupler, and voltage comparator circuit includes that voltage comparator, the first resistance are to the 6th resistance.The present invention be avoided that signal disturbing, ensure instrument gather data accurately, can improve service life, can alleviate weight, install more convenient, range is unrestricted, can realize the sample detecting of multiple current value, 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, there is the pure of high frequency chopping current sample input isolation features
Sinewave 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.
The power-saving method of lighting electricity saving device mostly is controllable silicon cut mode in the market, or autotransformer mode is adjusted
Pressure.Using controllable silicon cut mode, its output voltage waveforms is discontinuous, destroys the integrity of sine wave, can produce bigger
Harmonic wave disturbs, and voltage rises and falls suddenly and produces dash current, for life-span of light fixture also can be certain impact.Autotransformer side
Formula is output as sine wave, but its volume is big, and weight is the most heavier, installs inconvenience, and range is limited.
In integrated circuits, especially in Analogous Integrated Electronic Circuits, in order to detect big electric current, because the requirement of power consumption etc., need
To detect again after electric current is sampled.And the sampling of usual electric current can only have a kind of sampled value.Because can only sample one
Plant electric current, so the current value that it can be detected by is a kind of, be not easy to realize the sample detecting of multiple current value.
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
Interference, ensure instrument gather data accurately, service life can be improved, weight can be alleviated, more convenient, range be installed be not subject to
Limit, can realize the sample detecting of multiple current value, can carry out being effectively isolated, improving sampling by control signal and voltage sampling signal
The pure sine wave inverter with high frequency chopping current sample input isolation features of precision.
The technical solution adopted for the present invention to solve the technical problems is: it is defeated that structure one has high frequency chopping current sample
Enter the pure sine wave inverter of isolation features, including Power Entry Module, input isolation module, PWM module, Transformer Rectifier
Filtration module, SPWM drive module, LC filtration module, sine-wave generator, MCU, voltage sample module, current sample module and
Display module, the input of described input isolation module is connected with an outfan of described Power Entry Module, described input every
It is connected with the input of described PWM module from the outfan of module, the input of described Transformer Rectifier filtration module and institute
The outfan stating PWM module connects, and described SPWM drives an input of module and described Transformer Rectifier filtration module
Outfan connects, and the input of described LC filtration module drives the outfan of module to be connected with described SPWM, and described sine wave is sent out
The input of raw device is connected with the outfan of described LC filtration module, and the input of described voltage sample module is defeated with described power supply
Another outfan entering module connects, and an input of described MCU is connected with the outfan of described voltage sample module, described electricity
The input of stream sampling module is connected with another outfan of described PWM module, the outfan of described current sample module
Being connected with another input of described MCU, the outfan of described MCU is connected with the input of described display module；
Described sine-wave generator includes the first reverse blocking IGBT, the second reverse blocking IGBT, the 3rd continued flow tube, the 4th afterflow
Pipe, the 16th resistance, the first inductance, the 6th filter capacitor and load, described first reverse blocking IGBT and the second reverse blocking IGBT
In parallel, for realizing copped wave function, described first reverse blocking IGBT and the one of the parallel connection of the second reverse blocking IGBT by high frequency switching
Node is connected with the live wire of alternating current, and another node of described first reverse blocking IGBT and the parallel connection of the second reverse blocking IGBT is with described
One end of 16th resistance connects, and described 3rd continued flow tube and the 4th continued flow tube are in parallel, described 3rd continued flow tube and the 4th afterflow
The in parallel node of pipe is connected with one end of described 16th resistance, another of described 3rd continued flow tube and the parallel connection of the 4th continued flow tube
Node is connected with the zero line of alternating current, and the other end of described 16th resistance is connected with one end of described first inductance, and described
The other end of one inductance is connected with one end and the load of described 6th filter capacitor respectively, the other end of described 6th filter capacitor
It is connected with the zero line of described alternating current；
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；
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 high frequency chopping current sample input 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 other end of described 8th resistance is connected with described first voltage source.
In the pure sine wave inverter with high frequency chopping current sample input isolation features of the present invention, described
Voltage conversion circuit includes in audion, the 9th resistance and the tenth resistance, the base stage of described audion and described photoelectrical coupler
The colelctor electrode of phototriode connects, and the base stage of described audion connects the second voltage source also by described 9th resistance, described
The colelctor electrode of audion connects described second voltage source, the grounded emitter of described audion by described tenth resistance.
In the pure sine wave inverter with high frequency chopping current sample input isolation features of the present invention, described
Smoothed filter circuit includes the 11st resistance, the 12nd resistance, the 13rd resistance, the 3rd electric capacity and the 4th electric capacity；Described tenth
One end of one resistance is connected with the colelctor electrode of described audion, and the other end of described 11st resistance is electric with the described 12nd respectively
One end of resistance and one end of the 3rd electric capacity connect, the other end of described 12nd resistance, one end of the 13rd resistance and the 4th electricity
The one end held is all connected with voltage output end, the other end, the other end of the 13rd resistance and the 4th electric capacity of described 3rd electric capacity
The equal ground connection of the other end.
In the pure sine wave inverter with high frequency chopping current sample input isolation features of the present invention, described
Voltage sample module also includes stabilivolt, and the negative electrode of described stabilivolt connects described voltage output end, the anode of described stabilivolt
Ground connection.
In the pure sine wave inverter with high frequency chopping current sample input isolation features of the present invention, also wrap
Including output voltage detection module, an input of described output voltage detection module and described SPWM drive another output of module
End connects, and 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 high frequency chopping current sample input 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
All it is connected with the live wire of alternating current with the negative electrode of the 4th diode, the anode of described second diode and the negative electrode of the 3rd diode
All it is connected with the zero line of alternating current, as described rectification after the negative electrode of described first diode and the negative electrode connection of the second diode
As described rectification circuit after the cathode output end of circuit, the anode of described 3rd diode and the anode connection of the 4th diode
Cathode output end.
Implement the pure sine wave inverter with high frequency chopping current sample input isolation features of the present invention, have following
Beneficial effect: owing to using Power Entry Module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM
Drive module, LC filtration module, sine-wave generator, MCU, voltage sample module, current sample module and display module, sinusoidal
Wave producer include the first reverse blocking IGBT, the second reverse blocking IGBT, the 3rd continued flow tube, the 4th continued flow tube, the 16th resistance,
One inductance, the 6th filter capacitor and load, the first reverse blocking IGBT and the second reverse blocking IGBT are in parallel, for being switched by high frequency
Realizing copped wave function, use current sample module can realize the sample detecting of multiple current value, voltage sample module includes depending on
The rectification circuit of secondary connection, voltage comparator circuit, photoelectrical coupler, voltage conversion circuit and smoothed filter circuit, input isolation
Power supply input can be effectively isolated by module, and SPWM changes modulation pulse mode, pulse width exactly on the basis of PWM
Degree duty ratio of time presses the arrangement of sine gauge rate, and such output waveform can accomplish sinewave output through suitable filtering, and LC filters
Mode block is used for harmonic compensation, uses photoelectrical coupler MCU control signal and voltage sampling signal to be carried out effectively
Isolation, thus its be avoided that signal disturbing, ensure instrument gather data accurately, service life can be improved, weight, installation can be alleviated
More convenient, range is unrestricted, can realize multiple current value sample detecting, can be by control signal and voltage sampling signal
Carry out 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 one embodiment of pure sine wave inverter that the present invention has high frequency chopping current sample input isolation features
In structural representation；
Fig. 2 is the circuit theory diagrams of sine-wave generator 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 high frequency chopping current sample input isolation features, this tool
There is the structural representation of pure sine wave inverter of high frequency chopping current sample input isolation features as shown in Figure 1.In Fig. 1, should
The pure sine wave inverter with high frequency chopping current sample input isolation features includes Power Entry Module 1, input isolation mode
Block 2, PWM module 3, Transformer Rectifier filtration module 4, SPWM drive module 5, LC filtration module 6, sine-wave generator 7,
MCU8, voltage sample module 9, current sample module 10 and display module 11, 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, current sample module
The input of 10 is connected with another outfan of PWM module 3, and another of the outfan of current sample module 10 and MCU8 is defeated
Entering end to connect, the outfan of MCU8 is connected with the input of display module 11；The benefit using MCU8 is simple, cheap.Pass through
Display module 11 can find out voltage and power intuitively.
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 sine-wave generator in the present embodiment.In Fig. 2, this sine-wave generator 7 includes first
Reverse blocking IGBT Q11, the second reverse blocking IGBT Q12, the 3rd continued flow tube Q13, the 4th continued flow tube Q14, the 16th resistance R16,
One inductance L1, the 6th filter capacitor C6 and load, the first reverse blocking IGBT Q11 and the second reverse blocking IGBT Q12 are in parallel, be used for
Realize copped wave function by high frequency switching, a node in parallel for the first reverse blocking IGBT Q11 and the second reverse blocking IGBT Q12 with
The live wire ACL of alternating current connects, another node that the first reverse blocking IGBT Q11 and the second reverse blocking IGBT Q12 is in parallel and the
One end of 16 resistance R16 connects, and the 3rd continued flow tube Q13 and the 4th continued flow tube Q14 is in parallel, and the 3rd continued flow tube Q13 and the 4th continues
A node and one end of the 16th resistance R16 that flow tube Q14 is in parallel connect, and the 3rd continued flow tube Q13 and the 4th continued flow tube Q14 is in parallel
Another node be connected with the zero line ACN of alternating current, one end of the other end of the 16th resistance R16 and the first inductance L1 connects,
The other end of the first inductance L1 is connected with one end and the load of the 6th filter capacitor C6 respectively, the other end of the 6th filter capacitor C6
It is connected with the zero line ACN of alternating current.First inductance L1 is used for storage and the release of electric energy.
In the present embodiment, this sine-wave generator 7 uses DSP CONTROL pulse width modulation, and then controls
First reverse blocking IGBT Q11 and the second reverse blocking IGBT Q12 carries out the high frequency chopping of two-phase, sampled signal to ac signal
Give digital signal processor through signal conditioning circuit and carry out feedback adjustment pulse width modulation output.First reverse blocking IGBT
Q11 and the second reverse blocking IGBT Q12 be one-way conduction I two reverse and close, chop control two-way to alternating current.Numeral
Signal processor can export high-frequency PWM, and higher frequency can reduce harmonic wave, and higher frequency can reduce the body of inductance
Long-pending, alleviate weight；Wave mode after copped wave output remains sinusoidal wave, sinusoidal wave to well adapting to property of electric lighting, comparison
Bright appliance life does not affect, rely on Voltage Feedback control can stably export set by illuminating energy-saving voltage.
Concrete, in the present embodiment, for the positive wave part of alternating current, alternating current is on the live wire ACL of alternating current
Acting on load after second reverse blocking IGBT Q12 and the first inductance L1 energy storage, then the zero line ACN with alternating current forms loop；
Then DSP CONTROL PWM is cut off the second reverse blocking IGBT Q12, the first inductance L1 and is started to release the electric energy of storage
Put and act on load, then forming loop with the 3rd continued flow tube Q13；Then digital signal processor does not stops according to certain frequency
Control PWM switch on or off the second reverse blocking IGBT Q12, alternating current positive wave part formed high frequency chopping.
For the negative wave part of alternating current, the alternating current the first reverse blocking IGBT Q11 on the live wire ACL of alternating current and
Acting on load after first inductance L1 energy storage, then the zero line ACN with alternating current forms loop；Then digital signal processor control
PWM processed cuts off the first reverse blocking IGBT Q11, the first inductance L1 to start discharged by the electric energy of storage and act on load, then with
4th continued flow tube Q14 forms loop；Then digital signal processor ceaselessly controls PWM and switches on or off according to certain frequency
One reverse blocking IGBT Q11, the negative wave part at alternating current forms high frequency chopping.
By the positive wave part of above-mentioned alternating current and negative wave part ceaselessly high frequency chopping, and then output high frequency chopping is sinusoidal
Ripple acts on load, and its higher frequency can reduce harmonic wave, and higher frequency can reduce the volume of the first inductance L1, alleviates
Weight；Copped wave the waveform after the 6th filter capacitor C6 filtering output remain sinusoidal wave, and sinusoidal wave have relatively electric lighting
Good adaptability, does not affect illumination appliance life, rely on Voltage Feedback control stably to export set by illumination joint
Piezoelectric voltage.
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.
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 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.
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 high frequency chopping current sample input isolation features is the most normal,
Can make staff that whole system is had to grasp well.
In the present embodiment, this pure sine wave inverter with high frequency chopping current sample input isolation features also includes defeated
Going out voltage detection module 12, an input of output voltage detection module 12 drives another outfan of module 5 to be connected with SPWM,
Another input of output voltage detection module 12 is connected with the outfan of sine-wave generator 7.In real time sine wave can be sent out
Raw device 7 carries out Voltage Feedback, and whether detection voltage meets needs, then regulates SPWM and drive module 5 to change pulse, reaches needs
Voltage, say, that allow this pure sine wave inverter with high frequency chopping current sample input isolation features finally obtain
Voltage can meet needs.
In a word, in the present embodiment, this had the pure sine wave inversion of high frequency chopping current sample input isolation features
Device is used in armarium, time on military equipment, will not produce the interference of signal, and the accuracy of the data that instrument records also obtains very
Big raising.
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 (7)
1. a pure sine wave inverter with high frequency chopping current sample input isolation features, it is characterised in that include electricity
Source input module, input isolation module, PWM module, Transformer Rectifier filtration module, SPWM drive module, LC filtration module,
Sine-wave generator, MCU, voltage sample module, current sample module and display module, the input of described input isolation module
It is connected with an outfan of described Power Entry Module, the outfan of described input isolation module and described PWM module
Input connects, and the input of described Transformer Rectifier filtration module is connected with the outfan of described PWM module, described SPWM
Drive module an input be connected with the outfan of described Transformer Rectifier filtration module, the input of described LC filtration module and
Described SPWM drives the outfan of module to connect, the input of described sine-wave generator and the outfan of described LC filtration module
Connecting, the input of described voltage sample module is connected with another outfan of described Power Entry Module, and the one of described MCU is defeated
Enter end to be connected with the outfan of described voltage sample module, the input of described current sample module and described PWM module
Another outfan connect, the outfan of described current sample module is connected with another input of described MCU, described MCU's
Outfan is connected with the input of described display module；
Described sine-wave generator include the first reverse blocking IGBT, the second reverse blocking IGBT, the 3rd continued flow tube, the 4th continued flow tube,
16th resistance, the first inductance, the 6th filter capacitor and load, described first reverse blocking IGBT and the second reverse blocking IGBT are also
Join, for realizing, by high frequency switching, the joint that copped wave function, described first reverse blocking IGBT and the second reverse blocking IGBT are in parallel
Point is connected with the live wire of alternating current, described first reverse blocking IGBT and another node of the second reverse blocking IGBT parallel connection and described the
One end of 16 resistance connects, and described 3rd continued flow tube and the 4th continued flow tube are in parallel, described 3rd continued flow tube and the 4th continued flow tube
A node in parallel is connected with one end of described 16th resistance, another joint of described 3rd continued flow tube and the parallel connection of the 4th continued flow tube
Point is connected with the zero line of alternating current, and the other end of described 16th resistance is connected with one end of described first inductance, and described first
The other end of inductance is connected with one end of described 6th filter capacitor and load respectively, the other end of described 6th filter capacitor and
The zero line of described alternating current connects；
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；
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 high frequency chopping current sample input isolation features the most according to claim 1, its
Being characterised by, described voltage sample module also includes the 8th resistance, and the outfan of described voltage comparator is also electric with the described 8th
One end of resistance connects, and the other end of described 8th resistance is connected with described first voltage source.
The pure sine wave inverter with high frequency chopping current sample input isolation features the most according to claim 2, its
Being characterised by, described voltage conversion circuit includes audion, the 9th resistance and the tenth resistance, and the base stage of described audion is with described
In photoelectrical coupler, the colelctor electrode of phototriode connects, and the base stage of described audion connects second also by described 9th resistance
Voltage source, the colelctor electrode of described audion connects described second voltage source, the transmitting of described audion by described tenth resistance
Pole ground connection.
The pure sine wave inverter with high frequency chopping current sample input isolation features the most according to claim 3, its
Being characterised by, 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
It is connected with described one end of 12nd resistance and one end of the 3rd electric capacity, the other end of described 12nd resistance, the 13rd resistance
One end and one end of the 4th electric capacity be all connected with voltage output end, the other end of described 3rd electric capacity, the 13rd resistance another
End and the equal ground connection of the other end of the 4th electric capacity.
The pure sine wave inverter with high frequency chopping current sample input isolation features the most according to claim 4, its
Being characterised by, described voltage sample module also includes stabilivolt, and the negative electrode of described stabilivolt connects described voltage output end, described
The plus earth of stabilivolt.
The pure sine wave inverter with high frequency chopping current sample input isolation features the most according to claim 5, its
It is characterised by, also includes that output voltage detection module, an input of described output voltage detection module drive with described SPWM
Another outfan of module connects, another input of described output voltage detection module and the output of described sine-wave generator
End connects.
The pure sine wave inverter with high frequency chopping current sample input isolation features the most according to claim 1, its
Being characterised by, described rectification circuit includes the first diode, the second diode, the 3rd diode and the 4th diode, described
The anode of one diode and the negative electrode of the 4th diode are all connected with the live wire of alternating current, the anode of described second diode and
The negative electrode of three diodes 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 connect
Afterwards as the cathode output end of described rectification circuit, the anode of described 3rd diode and the anode of the 4th diode are made after connecting
Cathode output end for described rectification circuit.
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| CN201610531932.8A CN106160559A (en) | 2016-07-04 | 2016-07-04 | There is the pure sine wave inverter of high frequency chopping current sample input isolation features |
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| CN201610531932.8A CN106160559A (en) | 2016-07-04 | 2016-07-04 | There is the pure sine wave inverter of high frequency chopping current sample input isolation features |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706711A (en) * | 2017-02-10 | 2017-05-24 | 长沙巧力仪器设备有限公司 | Novel numerical control high-voltage paint film continuous-detection system |
| CN110582138A (en) * | 2019-05-22 | 2019-12-17 | 广州世荣电子股份有限公司 | light modulator |
-
2016
- 2016-07-04 CN CN201610531932.8A patent/CN106160559A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706711A (en) * | 2017-02-10 | 2017-05-24 | 长沙巧力仪器设备有限公司 | Novel numerical control high-voltage paint film continuous-detection system |
| CN110582138A (en) * | 2019-05-22 | 2019-12-17 | 广州世荣电子股份有限公司 | light modulator |
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Application publication date: 20161123 |