CN102281011A - Single-phase inversion frequency conversion power supply based on sine modulation wave - Google Patents
Single-phase inversion frequency conversion power supply based on sine modulation wave Download PDFInfo
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- CN102281011A CN102281011A CN2011102525123A CN201110252512A CN102281011A CN 102281011 A CN102281011 A CN 102281011A CN 2011102525123 A CN2011102525123 A CN 2011102525123A CN 201110252512 A CN201110252512 A CN 201110252512A CN 102281011 A CN102281011 A CN 102281011A
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Abstract
The invention relates to a single-phase inversion frequency conversion power supply based on a sine modulation wave. The single-phase inversion frequency conversion power supply comprises an inversion circuit which is connected with an overtemperature and overcurrent protection circuit, a separation power driving circuit and a soft starting circuit; the soft starting circuit is connected with a soft starting control signal generation circuit and a rectification circuit; the rectification circuit is connected with a 220-volt alternating current input; the separation power driving circuit is connected with a driving signal generation circuit which is connected with the overtemperature and overcurrent protection circuit, a digital/analog (D/A) conversion circuit, a sawtooth carrier wave generation circuit and a dead-zone circuit; the D/A conversion circuit is connected with a data memory and a voltage negation circuit; the data memory is connected with a counter which is connected with the dead-zone circuit, a voltage control oscillator and the data memory; the voltage control oscillator is connected with a voltage regulator; and the voltage regulator is connected with the voltage negation circuit. The single-phase inversion frequency conversion power supply has the advantages of changing the frequency of the power supply according to a load requirement, effectively saving the power supply, reducing the volume of a system and greatly improving the reliability of the system.
Description
Technical field
The present invention relates to a kind of single-phase inversion variable frequency power supply, belong to power supply control field based on sinusoidal modulation wave.
Background technology
Power electronic technology relates to electronics, electrodynamic and control theory, along with developing rapidly and control theory increasingly mature of microprocessor and power device, the application of power electronic technology also more and more widely, various power electronic equipments are widely used in that high voltage direct current transmission, static reactive, AC and DC power drag, inverter etc.
In the application of above power electronic equipment, the application of inverter is very extensive.In existing various power supplys, storage battery, solar cell etc. all is a DC power supply, when these power supplys of needs when AC load is powered, just need carry out inversion to it.A lot of AC load also need AC power to have variable frequency or variable voltage, such as the speed governing of alternating current machine obtaining stable AC power and enough power whiles.
In the various loads of single phase alternating current power supply, also usually need the frequency of single phase alternating current power supply and voltage to have adjustability flexibly, supply with to realize power supply energy-conservation and that load under the different operating mode.Having occurred at present with various microprocessors is the variable frequency power supply of control core, though all have higher performance,, this variable frequency power supply majority all is that cost is higher, and control is complicated, is not suitable for promoting the use of.
Summary of the invention
The purpose of this invention is to provide a kind of single-phase inversion variable frequency power supply based on sinusoidal modulation wave, change the frequency of AC power flexibly by the adjusting of potentiometer, control system adopts the devices at full hardware implementation, and is simple in structure, reduce the volume of inverter, and improved the reliability of system greatly.
According to technical scheme provided by the invention, described single-phase inversion variable frequency power supply based on sinusoidal modulation wave comprises: inverter circuit, the output of described inverter circuit connected gentle current foldback circuit, the input of inverter circuit connects isolated power drive circuit and soft starting circuit, the input of described soft starting circuit connects soft start control signal generative circuit, rectification circuit, the input of rectification circuit meets 220V and exchanges input, the input of described isolated power drive circuit connects drive signal generation circuit, the input of drive signal generation circuit connected gentle current foldback circuit, the D/A change-over circuit, sawtooth carrier generation circuit and dead-zone circuit, the input of described D/A change-over circuit connects data storage and voltage negate circuit, the input linkage counter of data storage, the output of counter also connects described dead-zone circuit, the input of counter connects voltage controlled oscillator, the input of voltage controlled oscillator connects voltage regulator, and the output of voltage regulator connects the input of voltage negate circuit; Wherein said rectification circuit, soft starting circuit and inverter circuit are called main circuit together; The output voltage of described voltage regulator is connected respectively to the voltage input of voltage controlled oscillator and the reference voltage input of D/A change-over circuit, by adjusting to the voltage regulator output voltage, change the reference voltage of D/A change-over circuit on the one hand, realize the change of Sine Modulated wave amplitude, change the input voltage of voltage controlled oscillator on the other hand, realize the change of voltage controlled oscillator output frequency; The frequency of voltage controlled oscillator output is carried out frequency division through counter, produces synchronizing signal simultaneously, and the signal behind the frequency division is as the address signal of data storage; The sine table of storing in the reading of data memory, the sinusoidal tabular value that reads out is generated required unipolarity sinusoidal modulation wave through the D/A change-over circuit, and the sawtooth carrier wave of described unipolarity sinusoidal modulation wave and the output of sawtooth carrier generation circuit relatively generates the SPWM signal in the back by the voltage comparator in the drive signal generation circuit; The synchronizing signal of counter output is through generating drive signal with described SPWM signal behind the dead-zone circuit; When occurring excess temperature or overcurrent in the main circuit, drive signal is blocked.
Described main circuit comprises: four single-phase inversion bridge circuits that the IGBT pipe constitutes, the output termination load of single-phase inversion bridge circuit, two inputs at the single-phase inversion bridge circuit are parallel with: the series arm of the second relay normally-closed contact and the 4th resistance, the 3rd resistance, second electric capacity, filter capacitor, the positive pole of filter capacitor connects the positive output end of diode rectifier bridge by charging resistor, the negative pole of filter capacitor connects the negative output terminal of described diode rectifier bridge, the input order phase 220V AC power of diode rectifier bridge; Described charging resistor two ends are parallel with the series arm of normally opened contact and first electric capacity and second resistance of first relay; Described charging resistor progressively increases DC bus-bar voltage when main circuit is connected single-phase 220V AC power, the voltage for the treatment of filter capacitor is 90% o'clock of steady-state value, the normally opened contact closure of first relay, thereby realize the soft function that opens of charging, the control signal of first relay is provided by soft start control signal generative circuit; The control coil of second relay is controlled by the 220V alternating voltage, the normally-closed contact of second relay is opened when main circuit is switched on, during the main circuit outage, second relay contact closure, the 4th resistance is parallel to discharge loop, this moment, the discharge time constant of main circuit diminished, the safety of main circuit when guaranteeing outage.
Described counter, data storage and D/A change-over circuit comprise: counter CD4040 realizes the counting to input pulse, the effect that also has simultaneously frequency division, the every half cycle of 12 pin output square wave of counter CD4040 has been represented to the pulsimeter of voltage controlled oscillator LM331 output 256 numbers, with its synchronizing signal as sinusoidal modulation wave; E
2The sine table of 256 data of PROM data storage storage inside; The output Q1 of counter CD4040～Q7 pin connects E
2Eight address input ends of PROM data storage are used for looking into the value of getting the sine table relative position; E
2The data output end of PROM data storage is connected to the digital quantity input of analog-digital chip DAC0808, through digital-to-analogue conversion output analog quantity, the current signal of analog-digital chip DAC0832 output changes voltage signal into through operational amplifier, described operational amplifier output sinusoidal modulation wave.
Described dead-zone circuit comprises: the synchronizing signal of counter output connects the input of first not gate and the first input end of first NAND gate, the first input end of output termination second NAND gate of first not gate, the output of first NAND gate connects the input of second not gate and connects second input of second NAND gate by the 25 resistance, the output of second NAND gate connects the input of the 3rd not gate and connects second input of first NAND gate by the 24 resistance, second input of described first NAND gate is by the 3rd capacity earth, and second input of second NAND gate is by the 4th capacity earth.
Described sawtooth carrier generation circuit adopts the pulse width modulation chip TL494 with fixed frequency, chip TL494 7,9,13,16, DT pin ground connection, the RT pin is by the 26 grounding through resistance, and the CT pin is by the 5th capacity earth, and the CT pin is exported the sawtooth carrier wave.The sawtooth carrier frequency of described output is at 5～15KH
Z
The gentle current foldback circuit of described mistake comprises: the temperature switch that detects IGBT pipe temperature, the output signal of temperature switch connects the anode of first diode and passes through the 28 grounding through resistance, first diode cathode and second diode cathode connect the input of not gate, the input of described not gate is also by the 30 grounding through resistance, second diode anode connects the output of first voltage comparator and connects+5V voltage by the 29 resistance, the positive input terminal of first voltage comparator also passes through the DC loop electric current of the 27 resistance order phase inversion bridge circuit by the 5th capacity earth, the negative input end of first voltage comparator connects the adjustable side of the 5th potentiometer and passes through the 4th capacity earth, two stiff ends, the one end ground connection of the 5th potentiometer, another termination+5V voltage; In case temperature surpasses 80 ℃, temperature switch closure, the output output low level of described not gate; When system's overcurrent, the current signal of detection becomes voltage signal through the 27 electric resistance changing, compare by first voltage comparator with the set point of potentiometer, and when surpassing the higher limit of setting, the output output low level of described not gate.
Described drive signal generation circuit comprises: sawtooth carrier wave and sinusoidal modulation wave are imported the negative input end and the positive input terminal of second voltage comparator respectively, the first input end of the output termination first of second voltage comparator and door and second with first input end and connect+5V voltage by the 33 resistance, the output termination first of dead-zone circuit second not gate and second input of door and the input of the 5th not gate, the output termination second of dead-zone circuit the 3rd not gate and second input of door and the input of the 7th not gate, first with the input of output termination the 4th not gate of door, second with door the input of output termination the 6th not gate, the described the 4th, five, six, the output of seven not gates connects the 3rd respectively, four, five, six with the door first input end, the described the 3rd, four, five, six take over the output of gentle current foldback circuit with second input of door; The SPWM signal that generates through voltage comparator LM339-1 and the synchronizing signal with Dead Time of dead-zone circuit output through described third and fourth, five, six with the drive signal of four IGBT pipes of generation driving behind the door; When excess temperature or overcurrent occurring, cross gentle current foldback circuit output signal will by described third and fourth, five, six with door blockade four tunnel drive signals, thereby realization is to the hardware protection of inverter circuit.
Advantage of the present invention has:
1. by the frequency of voltage regulator control out-put supply, realize the electrodeless adjusting of out-put supply frequency, the application scenario is extensive, can be used for the stepless time adjustment of electric fan, smoke exhaust ventilator etc., also can be used for the comparatively frequent occasion of ac power frequency conversion.
2. the present invention has designed unipolarity sinusoidal wave generation circuit, sawtooth carrier generation circuit, drive circuit, dead-zone circuit, inverter bridge circuit and has crossed gentle current foldback circuit etc. aspect hardware designs.Adopt the mode of hardware consulting table to generate the unipolarity Sine Modulated and involve and utilize integrated chip to produce sawtooth waveforms, make application of the present invention have more versatility, cross the reliability that gentle overcurrent protection has improved system.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present invention.
Fig. 2 is the schematic diagram of main circuit among Fig. 1.
Fig. 3 is a soft start control signal generative circuit schematic diagram.
Fig. 4 is voltage regulator, voltage controlled oscillator and voltage negate circuit theory diagrams.
Fig. 5 is counter, data storage and D/A change-over circuit schematic diagram.
Fig. 6 is the dead-zone circuit schematic diagram.
Fig. 7 is a sawtooth carrier generation circuit schematic diagram.
Fig. 8 was gentle current foldback circuit schematic diagram.
Fig. 9 is the drive signal generation circuit schematic diagram.
Figure 10 is an isolated power drive circuit schematic diagram.
Figure 11 mainly puts the waveform schematic diagram.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1; single-phase inversion variable frequency power supply based on sinusoidal modulation wave of the present invention comprises inverter circuit; the output of described inverter circuit connected gentle current foldback circuit; the input of inverter circuit connects isolated power drive circuit and soft starting circuit; the input of described soft starting circuit connects soft start control signal generative circuit; rectification circuit; the input of rectification circuit meets 220V and exchanges input; the input of described isolated power drive circuit connects drive signal generation circuit; the input of drive signal generation circuit connected gentle current foldback circuit; the D/A change-over circuit; sawtooth carrier generation circuit and dead-zone circuit; the input of described D/A change-over circuit connects data storage and voltage negate circuit; the input linkage counter of data storage; the output of counter also connects described dead-zone circuit; the input of counter connects voltage controlled oscillator; the input of voltage controlled oscillator connects voltage regulator, and the output of voltage regulator connects the input of voltage negate circuit.Wherein said rectification circuit, soft starting circuit and inverter circuit are called main circuit together.
The output voltage of voltage regulator is connected respectively to the voltage input of voltage controlled oscillator and the reference voltage input of D/A change-over circuit among the present invention, by adjusting to the voltage regulator output voltage, change the reference voltage of D/A change-over circuit on the one hand, realize the change of sinusoidal wave amplitude, change the input voltage of voltage controlled oscillator on the other hand, realize the change of voltage controlled oscillator output frequency; The frequency of voltage controlled oscillator output is carried out frequency division through counter, produces synchronizing signal simultaneously, and the signal behind the frequency division is as the address signal of data storage; The sine table of storing in the reading of data memory, the sinusoidal tabular value that reads out is generated required unipolarity sinusoidal modulation wave through the D/A change-over circuit, and the sinusoidal wave sawtooth carrier wave with the output of sawtooth carrier generation circuit of described unipolarity relatively generates the SPWM signal in the back by the voltage comparator in the drive signal generation circuit; The synchronizing signal of counter output is through generating drive signal with described SPWM signal behind the dead-zone circuit; When occurring excess temperature or overcurrent in the main circuit, drive signal is blocked, and plays the effect of effective protection main circuit.
Physical circuit principle and working method are as follows.
1. main circuit operation principle
Main circuit structure of the present invention as shown in Figure 2.Main circuit comprises: four single-phase inversion bridge circuits that the IGBT pipe constitutes, the output termination load of single-phase inversion bridge circuit, two inputs at the single-phase inversion bridge circuit are parallel with: the series arm of second relay J, 2 normally-closed contacts and the 4th resistance R 4, the 3rd resistance R 3, second capacitor C 2, filter capacitor E1, the positive pole of filter capacitor E1 connects the positive output end of diode rectifier bridge by charging resistor R1, the negative pole of filter capacitor E1 connects the negative output terminal of described diode rectifier bridge, the input order phase 220V AC power of diode rectifier bridge; Described charging resistor R1 two ends are parallel with the normally opened contact of first relay J 1 and the series arm of first capacitor C 1 and second resistance R 2.
The single-phase inversion bridge circuit is to be made of four IGBT FGA25N120, this device maximum operating voltage 1200V, maximum current 25A.
Main circuit has the soft function that opens of charging, can prevent from directly filter capacitor E1 to be produced great rush of current during the single-phase 220V power supply of connection when main circuit, thereby main circuit is caused damage.The present invention has increased a charging resistor R1 before filter capacitor E1, resistance R 1 can make DC bus-bar voltage progressively increase when main circuit is connected single-phase 220V power supply, avoided connecting the heavy current impact of moment to electric capacity E1, the voltage for the treatment of electric capacity E1 is 90% o'clock of steady-state value, first relay J, 1 normally opened contact closure, thereby realized charging the soft function that opens, the control signal of first relay J 1 is realized by soft start control signal generative circuit.First capacitor C 1 and second resistance R 2 play the filter action to rectifier power source.
The disorder of control signal may cause power switch pipe " to lead directly to " phenomenon during for fear of sudden power.The present invention has designed the system cut-off protective circuit, realizes this function with second relay J 2, the 4th resistance R 4.Second relay J 2 is a normally-closed contact, and its control coil is controlled by line voltage 220V.Open second relay J, 2 contacts when main circuit is switched on, and this moment, main circuit can be realized to electric capacity E1 " soft charging "; Main circuit when outage, second relay J, 2 closings of contact, the 4th resistance R 4 is parallel to discharge loop, and this moment, the discharge time constant of main circuit diminished, the safety of main circuit by can guarantee to cut off the power supply to suitably choosing of the 4th resistance R 4 time.
2. soft start control signal generative circuit
As shown in Figure 3, when main circuit is connected 220V interchange input, + 5V power supply charges to electric capacity E2 by resistance R 9, electric capacity E2 voltage raises gradually, when electric capacity E2 voltage was higher than the reverse input end voltage of voltage comparator LM311,7 pin of voltage comparator LM311 output high level generated the control coil that the soft start control signal drives relay J 1 by homophase gate circuit 74LS07, make relay J 1 closure, capacitor C 1, resistance R 2 and resistance R 1 are by short circuit simultaneously.Regulator potentiometer W4 can change the voltage of voltage comparator LM311 reverse input end, thereby realizes regulating the time that the soft start control signal generates.
3. voltage regulator, voltage controlled oscillator and voltage negate circuit
As shown in Figure 4, another termination of two stiff ends, one end ground connection+5V voltage of the first potentiometer W1, the adjustable side of the first potentiometer W1 is by electric capacity E3 ground connection; The adjustable side of the described first potentiometer W1 also connects the anode of the first amplifier IC1A by the 14 resistance R 14, the negative terminal that the first amplifier IC1A output connects self constitutes voltage follower; The adjustable side of the first potentiometer W1 also connects the negative terminal of the second amplifier IC1B by the 15 resistance R 15, the second amplifier IC1B output constitutes reverse ratio circuit, the second amplifier IC1B positive ending grounding by the negative terminal that the second potentiometer W2 connects self; The reference voltage input terminal of second amplifier IC1B output termination D/A change-over circuit; The first amplifier IC1A output connects 1 pin of voltage controlled oscillator LM331 and passes through first capacitor C 1 and the 16 resistance R 16 ground connection; 2 pin of voltage controlled oscillator LM331 are by the 19 resistance R 19 and the 3rd potentiometer W3 ground connection, 3 pin of voltage controlled oscillator LM331,4 pin ground connection, 5 pin of voltage controlled oscillator LM331 connect+5V voltage by second capacitor C, 2 ground connection and by the 17 resistance R 17,7 pin of voltage controlled oscillator LM331 connect+5V voltage and by the 20 resistance R 20 ground connection by the 18 resistance R 18,8 pin of voltage controlled oscillator LM331 connect+5V voltage, and 6 pin of voltage controlled oscillator LM331 connect+5V voltage and export to counter by the 21 resistance R 21.
Voltage regulator is made up of the first potentiometer W1 and the 3rd electric capacity E3.Adopt integrated double operational chip LF353 to constitute voltage follower and reverse ratio circuit, voltage follower realizes stablizing the input voltage of voltage controlled oscillator LM331, oppositely the output of ratio circuit is connected to the reference voltage input terminal REF of D/A converter, regulates the effect that the second potentiometer W2 can play the proportionality coefficient of regulating reverse ratio circuit.Can change voltage controlled oscillator LM331 output frequency f0 by the size of regulating the first potentiometer W1, also change the reference voltage of analog-digital chip DAC0808 simultaneously, thereby reached the purpose of V/F=CONST.
4. synchronizing signal and unipolarity sinusoidal modulation wave generative circuit
As shown in Figure 5, this circuit comprises counter, data storage and D/A change-over circuit.Counter CD4040 realizes the counting to input pulse, also has the effect of frequency division simultaneously.The every half cycle of 12 pin output square wave of counter CD4040 has been represented to the pulsimeter of voltage controlled oscillator LM331 output 256 numbers, with its synchronizing signal as sine wave.IC4 is data storage E
2PROM model AT28C17, sine table of storage inside (being the sine table of 256 data).The output Q1 of counter CD4040～Q7 connects address input end A0～A7 of data storage AT28C17, be used for looking into the value of getting the sine table relative position, I/O0～I/O7 is the data output end of AT28C17, I/O0～I/O7 is connected to the digital quantity input of analog-digital chip DAC0808, through digital-to-analogue conversion output analog quantity, what analog-digital chip DAC0832 exported is current signal, so change voltage signal into through operational amplifier LF351, operational amplifier LF351 exports sinusoidal modulation wave.
5. dead-zone circuit
The design of dead-zone circuit is " puncture " that causes power device in order to prevent drive signal from causing the power tube conducting simultaneously of same bridge wall, cause the damage of power device, dead-zone circuit of the present invention as shown in Figure 6, the realization in dead band is realized by the 24 resistance R 24, the 3rd capacitor C 3 and the 25 resistance R 25, the 4th capacitor C 4, regulates safe Dead Time by the size of regulating resistance, electric capacity.Be specially: the synchronizing signal of counter output connects the input of the first not gate IC6A and the first input end of the first NAND gate IC7A, the first input end of the output termination second NAND gate IC7B of the first not gate IC6A, the output of the first NAND gate IC7A connects the input of the second not gate IC6B and connects second input of the second NAND gate IC7B by the 25 resistance R 25, the output of the second NAND gate IC7B connects the input of the 3rd not gate IC6C and connects second input of the first NAND gate IC7A by the 24 resistance R 24, second input of the described first NAND gate IC7A is by the 3rd capacitor C 3 ground connection, and second input of the second NAND gate IC7B is by the 4th capacitor C 4 ground connection.
6. sawtooth carrier generation circuit
As shown in Figure 7, carrier signal of the present invention is produced by TL494.TL494 is a pulse width modulation chip with fixed frequency, built-in linear saw-tooth wave oscillator.Chip TL494 7,9,13,16, DT pin ground connection, the RT pin is by the 26 resistance R 26 ground connection, the CT pin is by the 5th capacitor C 5 ground connection, CT pin output sawtooth carrier wave.Frequency of oscillation can be regulated by the 26 external resistance R 26 and the 5th capacitor C 5, and its frequency of oscillation is
The sawtooth waveforms frequency requirement of the present invention's design is at 5～15KH
Z
7. cross gentle current foldback circuit
The present invention has overheat protector and overcurrent protection function.The output signal of temperature switch connects the anode of the first diode D1 and passes through the 28 resistance 28 ground connection, the first diode D1 negative electrode and the second diode D2 negative electrode connect the input of not gate, the input of described not gate is also by the 30 resistance R 30 ground connection, the second diode D2 anode connects the output of the first voltage comparator LM339-1 and connects+5V voltage by the 29 resistance R 29, the positive input terminal of the first voltage comparator LM339-1 also passes through the DC loop electric current of the 27 resistance R 27 order phase inversion bridge circuits by the 5th electric capacity E5 ground connection, the negative input end of the first voltage comparator LM339-1 connects the adjustable side of the 5th potentiometer W5 and passes through the 4th electric capacity E4 ground connection, two stiff ends, the one end ground connection of the 5th potentiometer W5, another termination+5V voltage.
Temperature switch among Fig. 8 is used for detecting the temperature of IGBT, in case temperature surpasses 80 ℃, and the temperature switch closure, protect holds output low level.When system's overcurrent, the current signal of detection is transformed into voltage signal through resistance R 27, compares by voltage comparator LM339-1 with the set point of potentiometer W5, surpasses the higher limit of setting, and protect holds output low level.Diode D1, D2 are used for realizing the single-phase transmission of signal.
8. drive signal generation circuit
Drive signal generation circuit comprises: sawtooth carrier wave and sinusoidal modulation wave are imported negative input end and the positive input terminal of the second voltage comparator ic 9A (LM339-1) respectively; the output termination first of the second voltage comparator ic 9A connects+5V voltage with the first input end of an IC10B and by the 33 resistance R 33 with the first input end and second of door IC10A; the output termination first of the dead-zone circuit second not gate IC6B and second input of door IC10A and the input of the 5th not gate; the output termination second of dead-zone circuit the 3rd not gate IC6C and second input of door IC10B and the input of the 7th not gate; first with the input of output termination the 4th not gate of door IC10A; second with door IC10B the input of output termination the 6th not gate; the described the 4th; five; six; the output of seven not gates (in the IC11 frame of broken lines) connects the 3rd respectively; four; five; six with the first input end of door (IC12 frame of broken lines in), the described the 3rd; four; five; six take over the output of gentle current foldback circuit with second input of door.
As shown in Figure 9, by the sawtooth carrier wave of Fig. 7 generation and the sinusoidal modulation wave V of Fig. 5 generation
oGenerate the SPWM signal through voltage comparator LM339-1; after realizing logic, generate the drive signal that drives four power tubes with the synchronizing signal A with Dead Time, B with door 74LS08; IC12 realizes hardware lock drive signal function; when excess temperature or overcurrent occurring; the protect low level signal will be by blocking four tunnel drive signals with door 74LS08, thereby realized the hardware protection to inverter circuit.
9. isolated power drive circuit
The isolated power drive circuit as shown in figure 10.Isolating device adopts high speed photo coupling device 6N137 in the present invention.The output speed of optocoupler 6N137 can reach 10M bit/s, has realized the electrical isolation of signal input end and output.Chip for driving is the IR2110 special power pipe driving chip of the American I R company that adopts, need only single power supply, and inside contains boostrap circuit, can solve inverter bridge upper and lower bridge arm power tube and drive not problem altogether, the design of simplified driving circuit.The output of two IR2110 drives the upper and lower bridge arm of 4 power tubes respectively.
As shown in figure 11,1 is the 1 pin output waveform of voltage follower IC1A among Fig. 4, and 2 is voltage controlled oscillator LM331 output waveform among Fig. 4, and 3 is REF output waveform among Fig. 4,4 is carrier wave and modulating wave waveform among Fig. 9,5 is SPWM signal waveform among Fig. 9, the 6th, and the 1 pin output waveform of IC7A among Fig. 6, the 7th, the 4 pin output waveforms of IC7A among Fig. 6, the 8th, the drive waveforms AL of VT2 among Fig. 2, the 9th, the drive waveforms BL of VT4 among Fig. 2, the 10th, the drive waveforms BH of VT3 among Fig. 2, the 11st, the drive waveforms AH of VT1 among Fig. 2.
Claims (8)
1. based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, comprise inverter circuit, it is characterized in that: the output of described inverter circuit connected gentle current foldback circuit, the input of inverter circuit connects isolated power drive circuit and soft starting circuit, the input of described soft starting circuit connects soft start control signal generative circuit, rectification circuit, the input of rectification circuit meets 220V and exchanges input, the input of described isolated power drive circuit connects drive signal generation circuit, the input of drive signal generation circuit connected gentle current foldback circuit, the D/A change-over circuit, sawtooth carrier generation circuit and dead-zone circuit, the input of described D/A change-over circuit connects data storage and voltage negate circuit, the input linkage counter of data storage, the output of counter also connects described dead-zone circuit, the input of counter connects voltage controlled oscillator, the input of voltage controlled oscillator connects voltage regulator, and the output of voltage regulator connects the input of voltage negate circuit; Wherein said rectification circuit, soft starting circuit and inverter circuit are called main circuit together; The output voltage of described voltage regulator is connected respectively to the voltage input of voltage controlled oscillator and the reference voltage input of D/A change-over circuit, by adjusting to the voltage regulator output voltage, change the reference voltage of D/A change-over circuit on the one hand, realize the change of Sine Modulated wave amplitude, change the input voltage of voltage controlled oscillator on the other hand, realize the change of voltage controlled oscillator output frequency; The frequency of voltage controlled oscillator output is carried out frequency division through counter, produces synchronizing signal simultaneously, and the signal behind the frequency division is as the address signal of data storage; The sine table of storing in the reading of data memory, the sinusoidal tabular value that reads out is generated required unipolarity sinusoidal modulation wave through the D/A change-over circuit, and the sawtooth carrier wave of described unipolarity sinusoidal modulation wave and the output of sawtooth carrier generation circuit relatively generates the SPWM signal in the back by the voltage comparator in the drive signal generation circuit; The synchronizing signal of counter output is through generating drive signal with described SPWM signal behind the dead-zone circuit; When occurring excess temperature or overcurrent in the main circuit, drive signal is blocked.
2. according to claim 1 based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, it is characterized in that described main circuit comprises: four single-phase inversion bridge circuits that the IGBT pipe constitutes, the output termination load of single-phase inversion bridge circuit, two inputs at the single-phase inversion bridge circuit are parallel with: the series arm of second relay (J2) normally-closed contact and the 4th resistance (R4), the 3rd resistance (R3), second electric capacity (C2), filter capacitor (E1), the positive pole of filter capacitor (E1) connects the positive output end of diode rectifier bridge by charging resistor (R1), the negative pole of filter capacitor (E1) connects the negative output terminal of described diode rectifier bridge, the input order phase 220V AC power of diode rectifier bridge; Described charging resistor (R1) two ends are parallel with the series arm of normally opened contact and first electric capacity (C1) and second resistance (R2) of first relay (J1); Described charging resistor (R1) progressively increases DC bus-bar voltage when main circuit is connected single-phase 220V AC power, the voltage for the treatment of filter capacitor (E1) is 90% o'clock of steady-state value, the normally opened contact closure of first relay (J1), thereby realize the soft function that opens of charging, the control signal of first relay (J1) is provided by soft start control signal generative circuit; The control coil of second relay (J2) is controlled by the 220V alternating voltage, the normally-closed contact of second relay (J2) is opened when main circuit is switched on, during the main circuit outage, second relay (J2) closing of contact, the 4th resistance (R4) is parallel to discharge loop, this moment, the discharge time constant of main circuit diminished, the safety of main circuit when guaranteeing outage.
3. according to claim 1 based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, it is characterized in that described counter, data storage and D/A change-over circuit comprise: counter CD4040 realizes the counting to input pulse, the effect that also has simultaneously frequency division, the every half cycle of 12 pin output square wave of counter CD4040 has been represented to the pulsimeter of voltage controlled oscillator LM331 output 256 numbers, with its synchronizing signal as sinusoidal modulation wave; E
2The sine table of 256 data of PROM data storage storage inside; The output Q1 of counter CD4040～Q7 pin connects E
2Eight address input ends of PROM data storage are used for looking into the value of getting the sine table relative position; E
2The data output end of PROM data storage is connected to the digital quantity input of analog-digital chip DAC0808, through digital-to-analogue conversion output analog quantity, the current signal of analog-digital chip DAC0832 output changes voltage signal into through operational amplifier, described operational amplifier output sinusoidal modulation wave.
As described in the claim 2 based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, it is characterized in that described dead-zone circuit comprises: the synchronizing signal of counter output connects the input of first not gate (IC6A) and the first input end of first NAND gate (IC7A), the first input end of output termination second NAND gate (IC7B) of first not gate (IC6A), the output of first NAND gate (IC7A) connects the input of second not gate (IC6B) and connects second input of second NAND gate (IC7B) by the 25 resistance (R25), the output of second NAND gate (IC7B) connects the input of the 3rd not gate (IC6C) and connects second input of first NAND gate (IC7A) by the 24 resistance (R24), second input of described first NAND gate (IC7A) is by the 3rd electric capacity (C3) ground connection, and second input of second NAND gate (IC7B) is by the 4th electric capacity (C4) ground connection.
5. according to claim 1 based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, it is characterized in that described sawtooth carrier generation circuit adopts the pulse width modulation chip TL494 with fixed frequency, chip TL494 7,9,13,16, DT pin ground connection, the RT pin is by the 26 resistance (R26) ground connection, the CT pin is by the 5th electric capacity (C5) ground connection, and the CT pin is exported the sawtooth carrier wave.
6. according to claim 1 based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, the sawtooth carrier frequency that it is characterized in that described output is at 5～15KH
Z
As described in the claim 2 based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, it is characterized in that the gentle current foldback circuit of described mistake comprises: the temperature switch that detects IGBT pipe temperature, the output signal of temperature switch connects the anode of first diode (D1) and passes through the 28 resistance (R28) ground connection, first diode (D1) negative electrode and second diode (D2) negative electrode connect the input of not gate, the input of described not gate is also by the 30 resistance (R30) ground connection, second diode (D2) anode connects the output of first voltage comparator and connects+5V voltage by the 29 resistance (R29), the positive input terminal of first voltage comparator also passes through the DC loop electric current (I) of the 27 resistance (R27) order phase inversion bridge circuit by the 5th electric capacity (E5) ground connection, the negative input end of first voltage comparator connects the adjustable side of the 5th potentiometer (W5) and passes through the 4th electric capacity (E4) ground connection, two stiff ends, the one end ground connection of the 5th potentiometer (W5), another termination+5V voltage; In case temperature surpasses 80 ℃, temperature switch closure, the output output low level of described not gate; When system's overcurrent, the current signal that detects is transformed into voltage signal through the 27 resistance (R27), compare by first voltage comparator with the set point of potentiometer (W5), when surpassing the higher limit of setting, the output output low level of described not gate.
As described in the claim 4 based on the single-phase inversion variable frequency power supply of sinusoidal modulation wave, it is characterized in that described drive signal generation circuit comprises: sawtooth carrier wave and sinusoidal modulation wave are imported the negative input end and the positive input terminal of second voltage comparator (IC9A) respectively, the first input end of the output termination first of second voltage comparator (IC9A) and door (IC10A) and second also connects+5V voltage by the 33 resistance (R33) with the first input end of door (IC10B), the output termination first of dead-zone circuit second not gate (IC6B) and second input of door (IC10A) and the input of the 5th not gate, the output termination second of dead-zone circuit the 3rd not gate (IC6C) and second input of door (IC10B) and the input of the 7th not gate, first with the input of output termination the 4th not gate of door (IC10A), second with door (IC10B) the input of output termination the 6th not gate, the described the 4th, five, six, the output of seven not gates connects the 3rd respectively, four, five, six with the door first input end, the described the 3rd, four, five, six take over the output of gentle current foldback circuit with second input of door; The SPWM signal that generates through voltage comparator LM339-1 and the synchronizing signal with Dead Time of dead-zone circuit output through described third and fourth, five, six with the drive signal of four IGBT pipes of generation driving behind the door; When excess temperature or overcurrent occurring, cross gentle current foldback circuit output signal will by described third and fourth, five, six with door blockade four tunnel drive signals, thereby realization is to the hardware protection of inverter circuit.
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| CN102665326A (en) * | 2012-04-14 | 2012-09-12 | 江苏物联网研究发展中心 | Practical automatic illumination controller of human body response |
| CN103036407A (en) * | 2012-12-06 | 2013-04-10 | 江苏嘉钰新能源技术有限公司 | Soft switch control circuit for full-bridge vehicle-mounted battery charger |
| CN104052301A (en) * | 2014-06-25 | 2014-09-17 | 哈尔滨工程大学 | Photovoltaic system DC-DC full-bridge converter based on soft switching technology |
| CN104539171A (en) * | 2014-12-29 | 2015-04-22 | 东莞市东怡机电有限公司 | Simple one-phase frequency conversion switching circuit |
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| CN102665326A (en) * | 2012-04-14 | 2012-09-12 | 江苏物联网研究发展中心 | Practical automatic illumination controller of human body response |
| CN103036407A (en) * | 2012-12-06 | 2013-04-10 | 江苏嘉钰新能源技术有限公司 | Soft switch control circuit for full-bridge vehicle-mounted battery charger |
| CN104052301A (en) * | 2014-06-25 | 2014-09-17 | 哈尔滨工程大学 | Photovoltaic system DC-DC full-bridge converter based on soft switching technology |
| CN104865998A (en) * | 2014-12-10 | 2015-08-26 | 重庆希诺达通信有限公司 | Programmable control single-phase alternating current power supply device |
| CN104539171A (en) * | 2014-12-29 | 2015-04-22 | 东莞市东怡机电有限公司 | Simple one-phase frequency conversion switching circuit |
| CN106411169A (en) * | 2015-07-30 | 2017-02-15 | 苏州大禾能源技术有限公司 | High-frequency inversion circuit based on digital-to-analog conversion |
| CN105576849A (en) * | 2015-12-29 | 2016-05-11 | 江苏米孚自动化科技有限公司 | Resonant coupling based brushless rotating member power supply apparatus |
| CN106451391A (en) * | 2016-11-21 | 2017-02-22 | 广东美的制冷设备有限公司 | Overcurrent protection peripheral circuit and electrical appliance |
| CN106712468A (en) * | 2017-03-07 | 2017-05-24 | 中交遥感载荷（北京）科技有限公司 | Power conversion drive signal generating circuit for unmanned management and control equipment |
| CN106712468B (en) * | 2017-03-07 | 2023-12-22 | 中交遥感天域科技江苏有限公司 | Power conversion driving signal generation circuit for unmanned management and control equipment |
| CN107017795A (en) * | 2017-03-31 | 2017-08-04 | 德力西(杭州)变频器有限公司 | Pulse-generator circuit and its control method |
| CN107017795B (en) * | 2017-03-31 | 2019-04-30 | 德力西(杭州)变频器有限公司 | Pulse-generator circuit and its control method |
| CN109713983A (en) * | 2018-12-29 | 2019-05-03 | 常州朗奇威电器有限公司 | Over Current Protection System, controller and over-current protection method |
| TWI765774B (en) * | 2020-08-25 | 2022-05-21 | 香港商雅達電子國際有限公司 | Bulk capacitor heating circuits in electrical power converters |
| CN112152516A (en) * | 2020-09-06 | 2020-12-29 | 安徽昊源化工集团有限公司 | Control system of parallel relay |
| CN113131756A (en) * | 2021-05-06 | 2021-07-16 | 山东精久科技有限公司 | Program-controlled variable frequency power supply with parallel function |
| CN113131756B (en) * | 2021-05-06 | 2022-09-02 | 山东精久科技有限公司 | Program-controlled variable frequency power supply with parallel function |
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