CN107517017A - A kind of single-phase voltage regulating sine wave frequency conversion inverter - Google Patents
A kind of single-phase voltage regulating sine wave frequency conversion inverter Download PDFInfo
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- CN107517017A CN107517017A CN201710874703.0A CN201710874703A CN107517017A CN 107517017 A CN107517017 A CN 107517017A CN 201710874703 A CN201710874703 A CN 201710874703A CN 107517017 A CN107517017 A CN 107517017A
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- sine wave
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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
-
- 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
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of single-phase voltage regulating sine wave frequency conversion inverter, including switch power module, auxiliary switching power supply module, power factor compensation boost module, Switching Power Supply isolation power conversion modules, standard sine wave and SPWM signal generator modules, sine wave inverter and power conversion modules.By the mating connection between above-mentioned modules, narrow range, volume that the present invention solves existing sine wave frequency conversion inverter voltage regulation and frequency modulation are big, weight is heavy, harmonic distortion is big, expensive, and the problem of underpower.
Description
Technical field
The present invention relates to power-supply device technical field, more particularly to a kind of single-phase voltage regulating sine wave frequency conversion inverter.
Background technology
At present, narrow range, the volume of existing pressure regulation sine wave frequency conversion inverter voltage regulation and frequency modulation be big, heavy (2KW is mono- for weight
Phase pressure regulation sine wave frequency conversion inverter weighs more than 36Kg), harmonic distortion it is big, expensive, and underpower can not meet
Inverter requirement of experiment.
The content of the invention
Therefore, for it is above-mentioned the problem of, the present invention proposes a kind of single-phase voltage regulating sine wave frequency conversion inverter, to be solved
Technical problem is：Narrow range, the volume of sine wave frequency conversion inverter voltage regulation and frequency modulation are big, weight is heavy, harmonic distortion is big, price is held high
It is expensive, and the problem of underpower.
To achieve the above object, present invention employs following technical scheme：A kind of single-phase voltage regulating sine wave frequency conversion inversion electricity
Source, including switch power module, auxiliary switching power supply module, power factor compensation boost module, Switching Power Supply isolation power become
Change the mold block, standard sine wave and SPWM signal generator modules, sine wave inverter and power conversion modules；
The switch power module includes short-circuit protection circuit, the first EMI circuits, the 2nd EMI circuits, the first rectifying and wave-filtering
Circuit and the second current rectifying and wave filtering circuit, the short-circuit protection circuit input connect civil power, the short-circuit protection circuit output end
Electrically connected respectively with the first EMI circuit input ends, the 2nd EMI circuit input ends, the first EMI circuit output ends and first whole
Flow filter circuit input to electrically connect, the first rectification filter circuit output end output+300V DC voltages, described second
EMI circuit output ends electrically connect with the second current rectifying and wave filtering circuit input, and the second rectification filter circuit output end output+
300V DC voltages, the first current rectifying and wave filtering circuit input electrically connect with power factor compensation boost module, the power
Factor compensation boost module output end exports 390V DC voltages；
The auxiliary switching power supply module includes switching power source chip, power output adjustment circuit, line voltage distribution detection electricity
Road, drain electrode clamp circuit, accessory power supply current rectifying and wave filtering circuit, energy storage switch transformer, accurate optocoupler feedback regulation control circuit,
First lower pressure rectifier filter circuit, the second lower pressure rectifier filter circuit, isolation power supply circuit, second current rectifying and wave filtering circuit are defeated
It is electric with line voltage distribution detection circuit input end, drain electrode clamp circuit input, power output adjustment circuit input respectively to go out end
Connection, switching power source chip adjust with line voltage distribution detection circuit output end, drain electrode clamp circuit output end, power output respectively
Circuit output end and the electrical connection of opto-coupled feedback controlling circuit of voltage regulation, the drain electrode clamp circuit output end also switchs with energy storage to be become
Depressor input electrically connects, the energy storage switch transformer output end respectively with the first lower pressure rectifier filter circuit input, the
Two lower pressure rectifier filter circuit inputs, the electrical connection of accessory power supply current rectifying and wave filtering circuit input, the first lower pressure rectifier filter
Wave circuit output end output+12.8V DC voltages, the second lower pressure rectifier filter circuit output end output+12.8V direct currents
Pressure, the second lower pressure rectifier filter circuit output end electrically connect with accurate optocoupler feedback regulation control circuit, and described second is low
Pressure rectification filter circuit output end electrically connects with isolating power supply circuit input, and the isolation power supply circuit output end output+
12.8V DC voltages, the accessory power supply rectification filter circuit output end electrically connect with accurate optocoupler feedback regulation control circuit；
The Switching Power Supply isolation power conversion modules include pwm signal generation circuit, the first H-bridge drive circuit, precision
Light-coupled isolation controlling circuit of voltage regulation, the 3rd current rectifying and wave filtering circuit, power isolated variable circuit, light-coupled isolation over-current control circuit,
The power factor compensation boost module output electrically connects with power isolated variable circuit input end, the power isolated variable electricity
Road output end is electric with light-coupled isolation over-current control circuit input, the 3rd current rectifying and wave filtering circuit input, the driving of the first H bridges respectively
Road input electrical connection, the 3rd rectification filter circuit output end are electrically connected with accurate light-coupled isolation controlling circuit of voltage regulation input
Connect, the light-coupled isolation over-current control circuit output end, the first H-bridge drive circuit output end, accurate light-coupled isolation voltage stabilizing control
Circuit output end electrically connects with pwm signal generation circuit respectively, and the first lower pressure rectifier filter circuit produces electricity with pwm signal
Road electrically connects, and is powered for pwm signal generation circuit；
The standard sine wave is isolated with SPWM signal generator modules including standard sine wave generation circuit, input voltage to be put
Big circuit, sine wave input selection circuit, sinusoidal amplitude regulation involve with control circuit, sine wave amplifying circuit, triangle
SPWM signal generating circuits, the isolation power supply circuit output end are respectively standard sine wave generation circuit, sine wave amplification electricity
SPWM signal generating circuits, input voltage isolating amplifier circuit offer+12.8V DC voltages, the sine wave are involved in road, triangle
Input selection circuit electrically connects with voltage isolating amplifier circuit, and the standard sine wave generation circuit inputs through sine wave select successively
Select circuit, sinusoidal amplitude regulation is connected sine wave amplifying circuit with control circuit；
The sine wave inverter includes the second H-bridge drive circuit, switch power amplifying circuit, low pass with power conversion modules
Filter circuit, the 3rd EMI circuits, the 4th current rectifying and wave filtering circuit, the second lower pressure rectifier filter circuit output end pass through successively
Second H-bridge drive circuit, switch power amplifying circuit connection low-pass filter circuit, the triangle involve SPWM signals and produce electricity
Road output end is electrically connected with the second H-bridge drive circuit, and SPWM signals, the 3rd rectification filter are provided for the second H-bridge drive circuit
Wave circuit output end is electrically connected with switch power amplifying circuit, and+390V DC voltages are provided for switch power amplifying circuit, described
First low pass filter output exports alternating current, and the bandpass filter output end passes sequentially through the 3rd EMI circuits, the 4th rectifying and wave-filtering
Circuit output direct current.
By using preceding solution, the beneficial effects of the invention are as follows：This single-phase voltage regulating sine wave frequency conversion inverter
It is integrated by cost-effective chip and other components composition frequency conversion voltage adjusting, isolation pressure regulation, direct current voltage reulation triple functions
Single-phase voltage regulating sine wave frequency conversion inverter, there is the advantages of small volume, in light weight, efficiency high.Using power factor compensation liter
Die block improves power factor, the harmonic harm of limitation current distortion；Using strong adaptability, High Frequency Switching power module, group
Into power-supply system, easily realize capacity extension, improve adjustable frequency scope (10Hz~500Hz), range of regulation (direct current 0~
320V, exchange 0~250V) and sine wave pure degree (harmonic distortion less than 1%), improve the working frequency of triangular wave.
Brief description of the drawings
Fig. 1 is the integrated circuit structured flowchart of the embodiment of the present invention one；
Fig. 2 is the circuit theory diagrams of the switch power module of the embodiment of the present invention one；
Fig. 3 is the circuit theory diagrams of the auxiliary switching power supply module of the embodiment of the present invention one；
Fig. 4 is the circuit theory diagrams of the power factor compensation boost module of the embodiment of the present invention one；
Fig. 5 is the circuit theory diagrams of the Switching Power Supply isolation power conversion modules of the embodiment of the present invention one；
Fig. 6 is circuit theory diagrams of the standard sine wave with SPWM signal generator modules of the embodiment of the present invention one；
Fig. 7 is the sine wave inverter of the embodiment of the present invention one and the circuit theory diagrams of power conversion modules；
Fig. 8 is the circuit theory diagrams of the change frequency sine-wave input detecting circuit of the embodiment of the present invention two；
Fig. 9 is the circuit theory diagrams of the civil power input ac voltage current power detection circuit of the embodiment of the present invention two；
Figure 10 is the circuit theory diagrams of the output frequency conversion voltage x current power-sensing circuit of the embodiment of the present invention two；
Figure 11 is the circuit theory diagrams of the output DC voltage and current power-sensing circuit of the embodiment of the present invention two；
Figure 12 is the central control process agent interface circuit schematic diagram of the embodiment of the present invention two；
Figure 13 is the LCDs interface circuit schematic diagram of the embodiment of the present invention two；
Figure 14 is the circuit theory diagrams of the keyboard circuit of the embodiment of the present invention two；
Figure 15 is the extension junction block P18 of the embodiment of the present invention two interface circuit schematic diagram；
Figure 16 is the extension junction block P22 of the embodiment of the present invention two interface circuit schematic diagram；
Figure 17 is the circuit theory diagrams of the acousto-optic indicating circuit of the embodiment of the present invention two；
Figure 18 is the circuit theory diagrams of the power display circuit of the embodiment of the present invention two；
Figure 19 is the extension junction block P19 of the embodiment of the present invention two interface circuit schematic diagram；
Figure 20 is the DAC control signal generation circuits of the embodiment of the present invention two.
Embodiment
In conjunction with the drawings and specific embodiments, the present invention is further described.
Embodiment one：
With reference to 1~Fig. 7 of figure, the present embodiment provides a kind of single-phase voltage regulating sine wave frequency conversion inverter, including Switching Power Supply
Module 1, auxiliary switching power supply module 2, power factor compensation boost module 3, Switching Power Supply isolation power conversion modules 4, standard
Sine wave and SPWM signal generator modules 5, sine wave inverter and power conversion modules 6, signal detection and display module 7；
As shown in figure 1, switch power module 1 includes short-circuit protection circuit 11, EMI circuits 12, EMI circuits 13, rectification filter
Wave circuit 14 and current rectifying and wave filtering circuit 15.As shown in Fig. 2 the protection circuit 11 includes protective tube F1, resistance Rt1 and resistance
Rv1, protective tube F1 play short-circuit protection, and resistance Rt1 is negative tempperature coefficient thermistor, and power network is rushed when reducing start
Hit, resistance Rv1 is piezo-resistance, and serving prevents from suffering thunderbolt.Interfere, L2, C4, C7 composition EMI circuits 12, prevent to reduce
Only power network interference signal, which enters to disturb caused by high-power isolating switch power and high-power isolating switch power, seals in power network, whole
Silicon stack D2, resistance R4 and electric capacity C2 composition current rectifying and wave filtering circuits 15 are flowed, due in order to improve power factor, being mended using power factor
Circuit is repaid, C2 capacity is unsuitable excessive, so it is larger to provide big heavy DC electricity pulsation；R4 is input AC current sampling
Resistance, there is provided input AC current sampling signal, * P1 are junction block, connection input voltage, electric current, power and power factor inspection
Slowdown monitoring circuit.L3, C17, C19 composition EMI circuits 13, prevent power network interference signal from entering auxiliary switching power supply and auxiliary switch electricity
The mutual crosstalk that interference caused by source is sealed between power network and high-power isolating switch power and auxiliary switching power supply, D14~
D17 forms current rectifying and wave filtering circuit 14, and C36 is filter capacitor, there is provided less low current DC voltage of pulsing.* P2 is junction block,
Mains input voltage waveform detection circuit is connected, to provide 50Hz sine wave signals, realizes the insulating power supply function of inverter.
The connected mode of above-mentioned switch power module 1 is：The input of short-circuit protection circuit 11 connects civil power, described short
The output end of road protection circuit 11 electrically connects with the input of EMI circuits 12, the input of EMI circuits 13 respectively, the EMI circuit outputs
End 12 electrically connects with the input of current rectifying and wave filtering circuit 15, the output end output+300V DC voltages of current rectifying and wave filtering circuit 15, institute
The output end of EMI circuits 13 is stated to electrically connect with the input of current rectifying and wave filtering circuit 14, the output end of current rectifying and wave filtering circuit 14 output+
300V DC voltages.
Fig. 4 be power factor compensation boost module 3 circuit theory diagrams, power factor compensation booster circuit as shown in figure 4,
It is BOOST topological structures, L1 is series connection accumulation inductance, and Q1 is paralleling switch pipe, and D1 is Schottky diode, plays rectification and isolation
Effect, C1 is filter capacitor.R2, RP2, R26, C35 form Voltage Feedback/breaking circuit, and output voltage is fed back to the 1 of IC5
Pin, play output voltage stabilizing control and overvoltage protection effect, the pin normal voltage range in below 2.5V, when output voltage raises,
Overvoltage, 7 pin do not have drive signal output, play overvoltage protection effect；When output voltage is low, or feedback resistance open circuit, 1 pin voltage
Step-down, chip shut-off, into low power mode of operation；Regulation RP2 size can change the size of output voltage.C33 is
Control voltage/soft start capacitor, control voltage play control input impedance and realize PFC；Upon power-up, the pin voltage
Slowly raise, driving the dutycycle of output can slowly become big, play soft start effect.R1, R24, C32, C34 composition input electricity
Pressure detection circuit, when detection input voltage is less than 2.4V, power supply is in under-voltage protection state, no output.R42 takes for electric current
Sample resistance, R40 are that overcurrent protection detects isolation resistance, and when flowing through R40 electric currents up to 200 microamperes, driving is without output.R41, C30 are
Multiplier voltage VM outer meeting resistances, electric capacity, are operated in average current type current PFC patterns, there is provided a voltage VM is used for PFC duty
Than modulation, the input impedance of PFC input circuits is proportional to the resistance R41 for being external in this end.R23 be drive signal DRV export every
From resistance, C13 is speed-up capacitor, makes driving pulse front and rear along precipitous, accelerator paralleling switch pipe Q1 conducting and cut-off, reduces
Loss, improve efficiency, R7 be paralleling switch pipe Q1 junction capacity discharge resistances, and DS1 be amplitude limit voltage-regulator diode, reduction disturb
Impulse amplitude, play protection Q1 and improve efficiency.R3, C5, C78 are IC5 power supply decoupling circuits, there is provided IC5 work electricity
Presser feet VCC (operating voltage 8.75-18V, starts voltage 12.25-14.5V).
As shown in figure 1, the auxiliary switching power supply module 2 include switching power source chip 20, power output adjustment circuit 21,
Line voltage distribution detection circuit 22, drain electrode clamp circuit 23, accessory power supply current rectifying and wave filtering circuit 24, energy storage switch transformer 25, essence
Close opto-coupled feedback controlling circuit of voltage regulation 26, lower pressure rectifier filter circuit 27, lower pressure rectifier filter circuit 28, isolation power supply circuit
29.Fig. 3 is the circuit theory diagrams of auxiliary switch power module 2, and IC19 is switching power source chip 20, and R77 detects for line voltage distribution
Circuit 22, play overvoltage, under-voltage protection, R76, RP10 composition power output adjustment circuit 21, R52, C45, D23, DS6 composition
Drain clamp circuit 23, avoids because peak voltage caused by leakage inductance damages Switching Power Supply control chip；D21、L5、R48、 C39、
C42, C43, C46, C47 composition lower pressure rectifier filter circuit 27, D21 are Schottky, and L5 is filter inductance, L5, C42, C43,
C46, C47 form л mode filters, reduce output voltage ripple, and lower pressure rectifier filter circuit 27 exports+12.8V DC voltages；
D24, L9, R54, C50, C57, C58, C59 composition lower pressure rectifier filter circuit 28, D4 are Schottky, and L9 is filter inductance, L9,
C56, C57, C58, C59 form л mode filters, reduce output voltage ripple and use two-stage common mode inductance L12, L13 and electric capacity
C65, C68, C78, C80 form anti-jamming circuit, this circuit be improve overall performance key point, the power supply after isolation
Be supplied to standard sine wave to produce and produce small signal circuit, signal detection and control circuit with SPWM signals, IC17, D29, L14,
C77, L15, C175, C176 form switch buck mu balanced circuit, L15 common mode inductances, and generation+5V D.C. regulated power supplies supply and display
Circuit uses.D26, C60 are that voltage stabilizing controls accessory power supply current rectifying and wave filtering circuit 24, there is provided control voltage, IC13, IC15, R69,
R70, R79, R82, C66, C69 form accurate optocoupler feedback regulation control circuit 26, make output voltage stabilization in+12.8V, C69
For soft start capacitor, R62, R80 are isolation resistance, C79, C82, R92 composition double time constant low pass filter, are reduced to control
The interference at end, improve the stability of circuit.
The connected mode of above-mentioned auxiliary switching power supply module 2 is：The switching power source chip 20 is examined with line voltage distribution respectively
The output end of slowdown monitoring circuit 22, drain electrode clamp circuit 23 output end, the output end of power output adjustment circuit 21 and opto-coupled feedback voltage stabilizing
Control circuit 26 electrically connects, and the drain electrode output end of clamp circuit 23 also electrically connects with the input of energy storage switch transformer 25, institute
The output end of energy storage switch transformer 25 is stated to input with the input of lower pressure rectifier filter circuit 27, lower pressure rectifier filter circuit 28 respectively
End, the electrical connection of the input of accessory power supply current rectifying and wave filtering circuit 24, the output end of lower pressure rectifier filter circuit 28 and accurate optocoupler
Feedback regulation control circuit 26 electrically connects, and the output end of lower pressure rectifier filter circuit 28 is with isolating the input of power supply circuit 29 electricity
Connection, the output end of accessory power supply current rectifying and wave filtering circuit 24 electrically connect with accurate optocoupler feedback regulation control circuit 26.
As shown in figure 1, the Switching Power Supply isolation power conversion modules 4 include pwm signal generation circuit 41, H bridges drive
Circuit 42, accurate light-coupled isolation controlling circuit of voltage regulation 45, current rectifying and wave filtering circuit 46, power isolated variable circuit 43, light-coupled isolation
Over-current control circuit 44.Fig. 5 isolates the circuit theory diagrams of power conversion modules 4, pwm signal generation circuit 41 for Switching Power Supply
Be made up of pulse width modulating chip TL494 and its peripheral cell, produce two-way complementary PWM signals, the pulse width of pwm signal by
IC2 1 pin voltage swing control, if there is output to be controlled by the excess current control of IC2 16 pin and the soft start of 4 pin, C6,
R37 is soft starting circuit, when IC2 4 pin are high level, no output.IC8, R43, R44, D18 form the standby control of light-coupled isolation
Circuit processed, when standby control signal SD is high level, IC2 4 pin are high level, while also control H-bridge drive circuit chip
The pin of IR2110 (IC3, IC7) 11 shut-off output, in holding state.C14, RP4, R36 form RC oscillating circuit timing circuits,
C14 is timing capacitor, and RP4, R36 timing resistor, sawtooth wave frequency rate can be changed by changing RP4.Q4、Q6、D8、D10、R33、R34
Accelerating circuit is formed, D8, D10 are isolating diode, put Q6, Q4 fast conducting between 9, the 10 pin output low period in IC2
Electricity, D8, D10 cut-off；Q4, Q6 quickly end between 9,10 pin output high period in IC2, D10, D8 fast conducting.R18、
C15, C16 form the power supply decoupling circuit of IC2 chip power supplies.
H-bridge drive circuit 42 drives the both sides field of full-bridge using two half-bridge driven chip IR2110 (IC3, IC7) respectively
Effect pipe Q2, Q3, Q5, Q7 press drive signal PWM ripple alternate conductions, the PWM ripples of power output amplification.In figure D4, C11 and
D13, C31 are respectively booster diode and bootstrap capacitor, and R12, C10, C18 and R31, C25, C37 are power source deoupling circuit, are reduced
Power supply disturbance between each several part.R11, R30, R38, R48 are isolation resistance, can make leading-edge pulse time long when too big, are increased
Add loss, current switch pipe can be made to cross Induced Oscillation when too small, C9, C20, C27, C38 are speed-up capacitor.
Power isolated variable circuit 43 is made up of disconnecting switch transformer T1, current switch pipe Q2, Q3, Q5, Q7 etc., real
Existing high power D C-DC mapping functions.R15, R29, R39, R45 are discharge resistance, and DS2, DS3, DS4, DS5 are amplitude limit voltage stabilizing two
Pole pipe, disturbing pulse amplitude is reduced, play protection Q2, Q3, Q5, Q7 and improve efficiency, R47 is current sampling resistor, above-mentioned
Device is set to improve efficiency, and R27 is isolation resistance, and D7 is isolating diode.D5, D6, D9, D11 are high pressure Schottky two
Pole pipe, form bridge rectifier 46, be DC PWM voltage by high-voltage alternating PWM voltage commutations, via L4, C14, C21,
C22, C23 composition Π mode filters become smooth direct current electricity output after filtering out higher hamonic wave.
Light-coupled isolation over-current control circuit 44 is by members such as resistance R6, R8, R10, R13, RP2, RP3, optocoupler IC1, electric capacity C3
Part forms.RP3 provides the setting of overcurrent protection datum mark voltage, R10, R13 are isolation resistance, D3, D7, R6 composition logic or pass
System, R6 is pull down resistor, and C3 is filter capacitor, as long as some circuit excessively stream can all act protection circuit, RP2 is excessively stream
Protection point adjustment potentiometer, IC1 play isolation control action, and R is current-limiting resistance.
Accurate light-coupled isolation controlling circuit of voltage regulation 45 by resistance R5, R9, R14, R19, R16, R17, R20, R21, R22,
The element such as R25, R28, R32, R35, optocoupler IC4, accurate three terminal regulator IC6, electric capacity C8, C12, C24, C26, C28 forms.
R9, R19 form bleeder circuit, there is provided reference voltage, R5, R14, R20 are isolation resistance, and C8 is filter capacitor, and C12 is integration
Negative-feedback electric capacity, PI amplifiers are formed with IC2 internal amplifiers 1, realize voltage stabilizing control function；R16, R22 form output voltage
Bleeder circuit, R16 play decompression metering function, and R22 plays pressure limiting, and R21 plays buffer action, and R28 plays shunting action, improves optocoupler
IC4 linear action；R17, R25, R35, RP5 form output voltage sample circuit, there is provided accurate voltage-stablizer IC6 comparison letter
Number, regulation IC6 output voltage stabilizing values, the driving current of change optocoupler light emitting diode, so as to change phototriode in optocoupler
Conducting degree, 1 pin to IC2 provide comparison signal, realize voltage stabilizing control function, and C8 is filter capacitor, reduces interference, improve steady
Stability is pressed, R32 is optocoupler IC4 load resistances.D12 is isolating diode, is started to control when ac output voltage is too high, realizes and hands over
Stream output voltage stabilizing control function, when ac output voltage is not high, does not influence the voltage stabilizing function of this circuit.C28 is safe electric capacity,
Reduce the drift of current potential.
The circuit connecting mode of above-mentioned Switching Power Supply isolation power conversion modules 4 is：The power factor compensation boosting mould
Block 3 output electrically connected with the input of power isolated variable circuit 43, the output end of power isolated variable circuit 43 respectively with light
Coupling isolation over-current control circuit 44 input, the input of current rectifying and wave filtering circuit 46, the electrical connection of the input of H bridges drive circuit 42, institute
State the output end of current rectifying and wave filtering circuit 46 to electrically connect with the accurate input of light-coupled isolation controlling circuit of voltage regulation 45, the rectifying and wave-filtering electricity
The output end of road 46 also electrically connects with switch power amplifying circuit, the output end of light-coupled isolation over-current control circuit 44, the driving of H bridges
The output end of circuit 42, the accurate output end of light-coupled isolation controlling circuit of voltage regulation 45 electrically connect with pwm signal generation circuit 41 respectively, institute
State lower pressure rectifier filter circuit 27 to electrically connect with pwm signal generation circuit 41, powered for pwm signal generation circuit 41；
As shown in figure 1, the standard sine wave and SPWM signal generator modules 5 include standard sine wave generation circuit 51,
Input voltage isolating amplifier circuit 56, sine wave input selection circuit 52, sinusoidal amplitude regulation and control circuit 53, sine wave
Amplifying circuit 54, triangle involve SPWM signal generating circuits 55.Fig. 6 be auxiliary switch power module 5 circuit theory diagrams, standard
Sine wave generation circuit 51 is made up of IC21 and its peripheral cell, can produce square wave, triangular wave, sine wave, rectangle, sawtooth waveforms.
RP16 is that sine wave symmetry adjusts potentiometer, and R116, R123 be isolation resistance, and RP17 is frequency adjustment potentiometer, R149,
C111, IC24 form cpu frequency control circuit, and C111 strobes to D/A conversion output control voltages.R136 is square wave
Collector load resistor is exported, R107, RP14, RP15, R137 are sine wave up-down symmetry trimming circuit, and R111 is sine wave
Output load resistance is；R124, C101, C102 power supply decoupling circuit, reduction interfere with other circuits.
Input voltage isolating amplifier circuit 56 is made up of the component such as accurate three-terminal regulator block IC27, optocoupler IC26, IC25,
R166, R171 form civil power bleeder circuit, and R166 plays antihypertensive effect, and R171 plays pressure limiting, D34, C119 composition halfwave rectifier
Filter circuit, R167, RP29, IC27, C120 composition accurate voltage-stabilizing circuit, there is provided optocoupler IC26 bias voltage, make optocoupler
For LED operation in linear zone, R168, R173 are isolation resistance in IC26, and R162, R163 composition mains input voltage take
Sample circuit, civil power sample to obtain the positive pole that faint sine wave signal is coupled to light emitting diode in optocoupler IC26 through electric capacity C118
End, carries out isolation modulation.Phototriode, R153, R169, IC25 and its peripheral cell composition light-coupled isolation are put in optocoupler IC26
Big circuit, R154, R155, R165, R170, RP27 composition biasing circuit, C117 is coupled capacitor, and C121 is shunt capacitance,
RP25 is negative feedback resistor, thus it is possible to vary the multiplication factor of amplifier.
Sine wave input selection circuit 52 is made up of double-point double-throw switch S1, selects variable frequency standard sine wave signal,
Frequency conversion inversion function is realized, civil power input is selected, realizes insulating power supply function.
Sinusoidal amplitude regulation is made up of with control circuit 53 elements such as RP12, RP13, Q13, and RP12 is amplitude adjusted electricity
Position device, Q13 are that amplitude controls triode, and R103 is direct current negative feedback resistor, and RP13 is bias-adjusted potentiometer, and C87 is exchange
Negative-feedback electric capacity, R99, R100, R101 are isolation resistance, and C88, C89 are filter capacitor.The amplitude control signal Ac that CPU is sent
Amplitude control pipe Q13 base stages are added to by R99.Ac output voltage after testing circuit isolation detection amplification and accurate full-wave rectification after
Closed loop amplitude control signal Vc is obtained, amplitude is also sent to after isolating via the RC filtering of resistance R101, electric capacity C88 composition, R100
Control pipe Q13 base stages, realize closed loop controlling of amplitude.
Sine wave amplifying circuit 54 is formed using the operational amplifier and peripheral cell carried inside IC20 (UC3637),
R105, R106, R120, R142, RP18 form biasing circuit, and C104 is shunt capacitance, and R115 is negative feedback resistor, and R141 is
Load resistance, C96 are high-frequency filter capacitor, and C92 is input coupling electric capacity, and C93 is output coupling capacitor.
Triangle, which involves SPWM signal generating circuits 55, includes triangular signal generation circuit and SPWM signal generating circuits, and three
Angle ripple signal generating circuit is made up of IC20 (UC3637) and peripheral cell, and RP19, R139 are timing resistor, and C107 is timing electricity
Hold, regulation RP19 can be with adjusting triangle ripple frequency of oscillation, and R108, R113, R125 be threshold level divider resistance, R113 for compared with
Big resistance makes triangle wave amplitude as big as possible, and to reduce ovennodulation distortion, C103, C108 are anti-High-frequency Interference electric capacity.SPWM
Signal generating circuit is made up of IC20 (UC3637) and peripheral cell, and circuit theory diagrams are as shown in Figure 6.Have two in UC3637
Individual independent PWM comparators, it is inputted, output end is all guided to outside piece respectively, can be directly by high frequency triangle wave using quite flexible
Signal (150kHz) produces two-way SPWM signals respectively by UC3637's compared with sine wave signal (10Hz~500Hz)
4 pin and the output of 7 pin, realize audio signal digitizing (1bit technologies).R104, R109, R112, R117 are that sine wave level turns
Move resistance.Sine wave signal is sent to 9 pin and 11 pin of two comparators by R109 and R112 respectively.9 pin are with pin 11 also by resistance R7
And R18 is coupled with ± Vs power supplys (this circuit uses single supply), triangular signal is applied directly to 8 pin and 10 pin by 2 pin.
R109, R112 are dead zone function resistance, and sinusoidal wave distortion is caused when too big, and the safety of output mos pipe work is influenceed when too small, because
This consideration that to compromise, takes 2.2k Ω resistance here.Two-way SPWM signals are produced in a comparator, it is (low in standby control signal SD
Level is effective, shut-off output during high level) output control door, one by one pulse Current-Limiting Comparator are sent to from IC20 14 pin under effect
Exported after comparing from 4 pin and 7 pin.R11, R17 are isolation resistance, reduce the influence of front stage, and SPWM distortions can be caused when too big,
It is unfavorable for front stage isolation when too small.
The circuit connecting mode of above-mentioned standard sine wave and SPWM signal generator modules 5 is：The isolation power supply circuit 29
Output end is respectively that standard sine wave generation circuit 51, sine wave amplifying circuit 54, triangle involve SPWM signal generating circuits
55th, input voltage isolating amplifier circuit 56 provides+12.8V DC voltages, and the standard sine wave generation circuit 51 is successively through just
String ripple input selection circuit 52, sinusoidal amplitude regulation are connected sine wave amplifying circuit 54 with control circuit 53.
As shown in figure 1, the sine wave inverter includes H-bridge drive circuit 61 with power conversion modules 6, switch power amplifies
Circuit 62, low-pass filter circuit 63, the 4th current rectifying and wave filtering circuit 64, current sampling circuit 65, EMI circuits 66.Fig. 7 is just
The inversion of string ripple and the circuit theory diagrams of power conversion modules 6, H-bridge drive circuit 61 use two half-bridge driven chip IR2110
(IC9, IC16) drives both sides current switch FET Q8, Q9, Q10, Q11 of full-bridge respectively, (low in standby control signal SD
Level is effective, shut-off output during high level) driving chip control output is sent to by drive signal from IC9, IC6 11 pin under effect
SPWM ripple alternate conductions, the SPWM ripples of power output amplification.D20, C55 and D28, C74 are respectively booster diode and bootstrapping electricity
Hold, R49, C40, C64 and R50, C51, C81 are power source deoupling circuit, reduce the power supply disturbance between each several part.R53、R71、
R81, R93 are isolation resistance, can make leading-edge pulse time long when too big, increase loss, current switch pipe mistake can be made when too small
Induced Oscillation, C44, C67, C70, C85 are speed-up capacitor.Power switch amplifying circuit 62 is by current switch pipe Q8, Q9, Q10, Q11
Deng composition, high power D C-AC mapping functions are realized.R57, R73, R86, R94 are discharge resistance, and DS7, DS8, DS9, DS10 are
Amplitude limit voltage-regulator diode, disturbing pulse amplitude is reduced, play protection Q8, Q9, Q10, Q11 and improve efficiency, R97 takes for electric current
Sample resistance.Low pass filter 63 is one of basic element of character in sine-wave inverter, is mainly used to reduction modulation low frequency signal, is
The key of whole circuit design, commonly use fertile hereby type low pass filter (the Butter worth Filter) of Bart, this wave filter
Can be no obvious the defects of, low is required to component Q values.2 ranks are commonly used in engineering to 5 stage structures, circuit form there are T-shaped and π types.By
It is in capacitive in the input impedance of π types, is a heavy duty to current switch, thus is suitable to select T-shaped electricity in sine-wave inverter
Road is (LCL structures).To make filtering clean, from the fertile hereby structure of the T-shaped Bart of 4 ranks, by L7, L8, L10, L11, C53, C54 group
Into filtering out higher hamonic wave signal, leave low-frequency ac signal, export AC sine wave supply voltage, output AC voltage and frequency
Rate is by input sine wave signal deciding.Output pressure regulation frequency-changing AC voltage is connected by junction block P3 with AC load all the way, R60
For ac output current sample resistance, circuit is detected with ac output voltage current power by junction block P6 and is connected, is realized defeated
Go out alternating voltage current power to show.Current rectifying and wave filtering circuit 64 is by D19, D22, D25, D27, L6, C41, C48, C49, C52 group
Into D19, D22, D25, D27 are high voltage Schottky diode, form bridge rectifier, output AC voltage is changed into be straight
Pulsating volage is flowed, filters out that to become smooth direct current electricity after higher hamonic wave defeated via L6, C41, C48, C49, C52 composition Π mode filters
Go out, be connected by junction block P4 with DC load, R55 is average anode current sample resistance, defeated by junction block * P3 and direct current
Go out the connection of voltage x current power-sensing circuit, realize that output DC voltage and current power is shown.In order to reduce DC rectifier filtering
Circuit reduces alternating current harmonic distortion, added between exchange output and current rectifying and wave filtering circuit to ac output voltage harmonic wave interference
Enter EMI circuits, be made up of common mode inductance L12, electric capacity C177.
The circuit connecting mode of above-mentioned sine wave inverter and power conversion modules 6 is：The lower pressure rectifier filter circuit 28
Output end electrically connects with H-bridge drive circuit 61, H-bridge drive circuit 61 electrically connects with switch power amplifying circuit 62, switch power
Amplifying circuit 62 electrically connects with low-pass filter circuit 63, switch power amplifying circuit 62 also with current rectifying and wave filtering circuit 46 and electric current
Sample circuit 65 electrically connects, and the triangle involves the output end of SPWM signal generating circuits 55 and electrically connected with H-bridge drive circuit 61,
SPWM signals are provided for H-bridge drive circuit 61, the output end of current rectifying and wave filtering circuit 46 is electrically connected with switch power amplifying circuit 62
Connect, provide+350V DC voltages for switch power amplifying circuit 62, the output end of low pass filter 63 exports alternating current, institute
State the output end of low pass filter 63 and export direct current through EMI circuits 66, current rectifying and wave filtering circuit 64 successively.
Embodiment two：
(1) such as Fig. 8~Figure 20, on the basis of above-described embodiment one, the present embodiment increase center control microprocessor, liquid
Crystal display screen, keyboard circuit, extension junction block P18, extension junction block P19, extension junction block P22, power display circuit, acousto-optic
Indicating circuit, DAC control signals generation circuit, become frequency sine-wave input detecting circuit 7, civil power input ac voltage current power
Detect circuit, output frequency conversion voltage x current power-sensing circuit, output DC voltage and current power-sensing circuit.
The change frequency sine-wave input detecting circuit 7 includes accurate full-wave rectifying circuit 71, Opportunity awaiting control for linear comparator 72, number
Word frequency meter 71, accurate full-wave rectifying circuit 71 are made up of IC22 and its peripheral circuit, using single supply amplifying circuit, therefore are needed
Biasing circuit is set, using homophase input mode, there is very high input impedance, reduces shadow of the input signal to other circuits
Ring.R132, R152 form the in-phase input end biasing resistor of amplifier 1, R133, R147, RP24 composition inverting input of amplifier 1
Biasing resistor, C115 are shunt capacitance, improve gain, R134, R159 are the in-phase input end biasing resistor of amplifier 2, and R121 is
Isolation resistance, D31, D32 are commutation diode, and RP20 is negative feedback resistor, thus it is possible to vary gain.R140、R148、 C106、
C109 forms double time constant low pass filter, filters out second harmonic, obtains smooth DC voltage, and R144 is load resistance,
C95, C97 are power supply decoupling circuit, reduce interfering between other circuits.When inputting positive half cycle, D31 conductings, D32 is cut
Only, equivalent in-phase proportion amplifier, gain=1+ (R121+RP20)/(R133//R147), when inputting negative half period, D32 conductings,
D31 end, equivalent anti-phase proportional amplifier, gain=- RP20/R121, adjust RP20, can when positive-negative half-cycle output amplitude phase
Deng.When having signal input, high level is exported, when being inputted without signal, output level is half of supply voltage or so, utilizes this
Signal through standby comparator relatively after produce standby control signal SD, the power cutoff when SD be high level, reduction idling consumption,
When SD is low level, power on, noncontacting switch is realized.Opportunity awaiting control for linear comparator 72 is by IC23 and its peripheral cell group
Into R126, R145, RP22 form Opportunity awaiting control for linear reference voltage, are added to the in-phase end of comparator, and R128 is comparator end of oppisite phase
Upper filling resistance, R161 be comparator end of oppisite phase pull down resistor, R138 be comparator export isolation resistance, R127, R160 be than
Machine loading resistance, C98 are soft start capacitor.The high level detection signal for becoming the output of frequency sine-wave input detecting circuit passes through
Isolating diode D33 is added to the end of oppisite phase of comparator, and it is low level to make comparator output standby control signal SD, power work.
Current sampling compares the end of oppisite phase that amplified signal Isc is also added to comparator by isolation resistance R129, and when excessively stream, Isc is low
Level drags down Opportunity awaiting control for linear comparator end of oppisite phase level, makes output Opportunity awaiting control for linear SD be high level, power cutoff；In CPU controls
The shutdown control signal OFF (high level shut-off) of heart output is added to shutdown control triode Q14 saturation conductions by isolation resistance,
Opportunity awaiting control for linear comparator end of oppisite phase level can be equally dragged down, makes output Opportunity awaiting control for linear SD be high level, power cutoff.Frequency meter
Interface circuit forms in-phase proportion amplifier by IC23 and its peripheral cell, and R130, R158 are in-phase input end biasing resistor,
R131, R146, RP23 are inverting input biasing resistor, and C114 is shunt capacitance, improve gain, and RP21 is negative feedback resistor,
For C113 to become frequency sine-wave input coupling electric capacity, C116 is high-frequency filter capacitor.Change frequency sine-wave after amplification, can directly connect
Frequency meter is connect, CPU can also be met and carry out frequency detecting and display.
The civil power input ac voltage current power detection circuit uses Chinese Patent Application No. 2017106877326
A kind of variable-frequency power sources voltage x current power isolation detection interface circuit announced, its physical circuit principle will not be repeated here,
The output frequency conversion voltage x current power-sensing circuit uses one kind that Chinese Patent Application No. 201710687735X is announced
Variable-frequency power sources voltage x current power isolation detection interface circuit, its physical circuit principle will not be repeated here, the output direct current
A kind of direct current power source voltage electricity that voltage x current power-sensing circuit is announced using Chinese Patent Application No. 2017106877307
Power isolation detection interface circuit is flowed, its physical circuit principle will not be repeated here.
As described in Figure 12 center control microprocessor by center control microprocessor chip IC43 (CPUSTC90C52) and
Its peripheral cell forms minimum system, SB5, R250, C160 composition reset circuit, electric automatic reset electro on R250, C160 composition
Road, SB5 are hand-reset button.RP48 is that exclusion is filled on P0 mouth OC doors, and P17 is signal acquisition input wires seat, and P22 is control
Signal output junction block processed, P19 are download mouth.
Keyboard circuit is made up of SB1-SB4, and SB1 is function selection key, and SB2 is increment control algorithm button, and SB3 decrements are controlled
Button processed, SB4 shutdown control buttons.P18, P20, P21 are Function Extension junction block.Switch S2, R247, DS12 composition power supply
Display circuit.R244, R245, Q15, D34, DS11, BELL1 form button operation acousto-optic indicating circuit.DAC control signals produce
Circuit is made up of DAC chip IC44 (TLV5621L) and its peripheral cell, and R251, RP49, R252, IC45 form accurate voltage stabilizing electricity
Road, there is provided reference voltage, R249, C161, C162 composition power supply decoupling circuit.Go out serial data from IC43 11 human hair combing wastes, going here and there
From IC44 6 pin input datas under row clock signal CLK2 control, changed through DAC and produce three tunnel control signals, respectively width
Spend control signal Ac, frequency adjustment control signal fc, overcurrent protection adjustment control signal Iovc.EN1 is input Enable Pin, high electric
Flat effective, HWACT is hardware activation control terminal.Liquid crystal display circuit is by LCDs J1 (12864) and its peripheral cell group
Into RP47 is contrast adjustment potentiometer, and R248 is background light current-limiting resistance.
Although specifically showing and describing the present invention with reference to preferred embodiment, those skilled in the art should be bright
In vain, do not departing from the spirit and scope of the present invention that appended claims are limited, in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (1)
- A kind of 1. single-phase voltage regulating sine wave frequency conversion inverter, it is characterised in that：Including switch power module, auxiliary switching power supply Module, power factor compensation boost module, Switching Power Supply isolation power conversion modules, standard sine wave and SPWM signals produce mould Block, sine wave inverter and power conversion modules；The switch power module includes short-circuit protection circuit, the first EMI circuits, the 2nd EMI circuits, the first current rectifying and wave filtering circuit With the second current rectifying and wave filtering circuit, the short-circuit protection circuit input connects civil power, the short-circuit protection circuit output end difference Electrically connected with the first EMI circuit input ends, the 2nd EMI circuit input ends, the first EMI circuit output ends and the first rectification are filtered Wave circuit input electrically connects, the first rectification filter circuit output end output+300V DC voltages, the 2nd EMI electricity Road output end electrically connects with the second current rectifying and wave filtering circuit input, and the second rectification filter circuit output end output+300V is straight Voltage is flowed, the first current rectifying and wave filtering circuit input is electrically connected with power factor compensation boost module, and the power factor is mended Repay boost module output end output 390V DC voltages；The auxiliary switching power supply module includes switching power source chip, power output adjustment circuit, line voltage distribution detection circuit, leakage Pole clamp circuit, accessory power supply current rectifying and wave filtering circuit, energy storage switch transformer, accurate optocoupler feedback regulation control circuit, first Lower pressure rectifier filter circuit, the second lower pressure rectifier filter circuit, isolation power supply circuit, second rectification filter circuit output end Electrically connected respectively with line voltage distribution detection circuit input end, drain electrode clamp circuit input, power output adjustment circuit input, Switching power source chip detects circuit output end, drain electrode clamp circuit output end, power output adjustment circuit with line voltage distribution respectively Output end and the electrical connection of opto-coupled feedback controlling circuit of voltage regulation, the drain electrode clamp circuit output end also with energy storage switch transformer Input electrically connects, the energy storage switch transformer output end respectively with the first lower pressure rectifier filter circuit input, second low Press current rectifying and wave filtering circuit input, the electrical connection of accessory power supply current rectifying and wave filtering circuit input, the first lower pressure rectifier filtered electrical Road output end output+12.8V DC voltages, the second lower pressure rectifier filter circuit output end output+12.8V DC voltages, The second lower pressure rectifier filter circuit output end electrically connects with accurate optocoupler feedback regulation control circuit, and second low pressure is whole For stream filter circuit output end with isolating the electrical connection of power supply circuit input, the isolation power supply circuit output end output+12.8V is straight Voltage is flowed, the accessory power supply rectification filter circuit output end electrically connects with accurate optocoupler feedback regulation control circuit；The Switching Power Supply isolation power conversion modules include pwm signal generation circuit, the first H-bridge drive circuit, accurate optocoupler Isolate controlling circuit of voltage regulation, the 3rd current rectifying and wave filtering circuit, power isolated variable circuit, light-coupled isolation over-current control circuit, it is described The output of power factor compensation boost module electrically connects with power isolated variable circuit input end, and the power isolated variable circuit is defeated It is defeated with light-coupled isolation over-current control circuit input, the 3rd current rectifying and wave filtering circuit input, the first H-bridge drive circuit respectively to go out end Entering end electrical connection, the 3rd rectification filter circuit output end electrically connects with accurate light-coupled isolation controlling circuit of voltage regulation input, The light-coupled isolation over-current control circuit output end, the first H-bridge drive circuit output end, accurate light-coupled isolation controlling circuit of voltage regulation Output end electrically connects with pwm signal generation circuit respectively, the first lower pressure rectifier filter circuit and pwm signal generation circuit electricity Connection, powered for pwm signal generation circuit；The standard sine wave includes standard sine wave generation circuit with SPWM signal generator modules, input voltage isolates amplification electricity Road, sine wave input selection circuit, sinusoidal amplitude regulation and control circuit, sine wave amplifying circuit, triangle involve SPWM letters Number generation circuit, the isolation power supply circuit output end is respectively standard sine wave generation circuit, sine wave amplifying circuit, triangle SPWM signal generating circuits, input voltage isolating amplifier circuit offer+12.8V DC voltages, the sine wave input choosing are provided Select circuit to electrically connect with voltage isolating amplifier circuit, the standard sine wave generation circuit inputs selection electricity through sine wave successively Road, sinusoidal amplitude regulation are connected sine wave amplifying circuit with control circuit；The sine wave inverter includes the second H-bridge drive circuit, switch power amplifying circuit, LPF with power conversion modules Device circuit, the 3rd EMI circuits, the 4th current rectifying and wave filtering circuit, the second lower pressure rectifier filter circuit output end is successively through the 2nd H Bridge drive circuit, switch power amplifying circuit connection low-pass filter circuit, it is defeated that the triangle involves SPWM signal generating circuits Go out end to electrically connect with the second H-bridge drive circuit, SPWM signals, the 3rd rectifying and wave-filtering electricity are provided for the second H-bridge drive circuit Road output end is electrically connected with switch power amplifying circuit, and+390V DC voltages, the low pass are provided for switch power amplifying circuit Filter output exports alternating current, and the bandpass filter output end passes sequentially through the 3rd EMI circuits, the 4th current rectifying and wave filtering circuit Export direct current.
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| CN108023411A (en) * | 2018-01-17 | 2018-05-11 | 河南工程学院 | A kind of single-phase contactless power supply system with power factor emendation function |
| CN108134529A (en) * | 2018-01-17 | 2018-06-08 | 黎明职业大学 | A kind of three-phase sine-wave inverter |
| CN109067209A (en) * | 2018-09-30 | 2018-12-21 | 严添明 | A kind of high-power wide scope adjustable DC linear stabilized power supply |
| CN109525104A (en) * | 2018-10-09 | 2019-03-26 | 三英精控（天津）仪器设备有限公司 | The adjustable AC/DC universal power supply of frequency amplitude |
| CN111404365A (en) * | 2020-04-10 | 2020-07-10 | 海信（山东）空调有限公司 | Switching power supply circuit and electrical equipment |
| CN113640559A (en) * | 2021-09-01 | 2021-11-12 | 南京普源电气有限公司 | Frequency conversion voltage regulation power supply for partial discharge measurement test of switch type sine waveform output |
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| CN108134529A (en) * | 2018-01-17 | 2018-06-08 | 黎明职业大学 | A kind of three-phase sine-wave inverter |
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| CN109067209A (en) * | 2018-09-30 | 2018-12-21 | 严添明 | A kind of high-power wide scope adjustable DC linear stabilized power supply |
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| CN111404365A (en) * | 2020-04-10 | 2020-07-10 | 海信（山东）空调有限公司 | Switching power supply circuit and electrical equipment |
| CN111404365B (en) * | 2020-04-10 | 2021-09-28 | 海信（山东）空调有限公司 | Switching power supply circuit and electrical equipment |
| CN113640559A (en) * | 2021-09-01 | 2021-11-12 | 南京普源电气有限公司 | Frequency conversion voltage regulation power supply for partial discharge measurement test of switch type sine waveform output |
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