CN203840210U - AC inverter circuit - Google Patents
AC inverter circuit Download PDFInfo
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- CN203840210U CN203840210U CN201420137277.4U CN201420137277U CN203840210U CN 203840210 U CN203840210 U CN 203840210U CN 201420137277 U CN201420137277 U CN 201420137277U CN 203840210 U CN203840210 U CN 203840210U
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Abstract
The utility model discloses an AC inverter circuit including a three-phase alternating current (1), a surge absorbing circuit (3), a rectification filtering circuit (5), an inverter circuit (7), a load (9), a detection feedback circuit (10), a control circuit (12) and a driving circuit (14). The three-phase alternating current (1) lets power signals (2) to pass through the surge absorbing circuit (3) for interference signal treatment and then transmits alternating current signals (4) to the rectification filtering circuit (5). Direct current signals (6) output after rectification and smoothing provides collector power supply for four power switch tubes of the inverter circuit (7). The direct current signals (6) controls PWM pulse control signals (13) of the four power switch tubes of the inverter circuit (7) through the control circuit (12) and the driving circuit (14) to output AC inversion signals (8) required by the load. After being detected by the detection feedback circuit (10), the AC inversion signals (8) output feedback signals (11) for providing the control circuit (12) control signals. After amplifying and isolating the control signals (13), the driving circuit (14) drives the power switch tubes. By utilizing the AC inverter circuit provided by the utility model, performance of the inverter circuit is improved; switch loss of the power switch tubes in the inverter circuit is reduced; service lifetimes of the switch tubes are prolonged; and load impedance adjustment is realized by utilizing a dead zone control strategy.
Description
Technical field
The utility model relates to soft switch technique, refers more particularly to the induction heating power of realizing the ac converter circuit of AC-DC-AC by converter.
Background technology
At present, ac converter circuit can be used for alternating current motor frequency control, improve the power supply quality of utility grid, various fields such as the development and utilization of new forms of energy, uninterrupted power supply, household electrical appliance.But the high frequencyization of inverter must be brought the problem of switching loss.Utilize the utility model, improve the performance of inverter circuit, reduce turn-on consumption, suppress peak voltage, reduce the turn-off power loss of device, guaranteed output pipe is better worked; Adopt after the control strategy of dead band simultaneously, can realize load impedance adjustment.
Summary of the invention
The utility model is intended to solve the deficiencies in the prior art, provides a kind of break-make of power switch pipe of utilizing power frequency 50Hz to be become to the ac converter circuit of the required frequency of load.
Ac converter circuit, comprises three-phase alternating current, surge absorbing circuit, current rectifying and wave filtering circuit, inverter circuit, load, detection feedback circuit, control circuit, drive circuit;
Described three-phase alternating current provides the signal of telecommunication for described load;
Described surge absorbing circuit is processed the interference signal of described three-phase alternating current;
Described current rectifying and wave filtering circuit the three-phase ac signal of described surge absorbing circuit output after described current rectifying and wave filtering circuit rectifying and wave-filtering for described inverter circuit provides d. c. voltage signal;
Described load is to supply with described load by the square wave voltage signal after described inverter circuit inversion;
Described detection feedback circuit is from load end, to induce alternating current by current transformer, and feedback signal, gives described control circuit after treatment;
Described control circuit is that the signal of described detection feedback circuit is delivered to described control circuit, by regulating the 6 pin resistance sizes of control chip SG3525 can regulate and control the pwm pulse frequency of SG3525 output, by regulating 9 pin voltages to change output pulse width, by regulating dead band resistance, control Dead Time, in assurance, lower power switch pipe can not lead directly to, avoid 2 power switch pipes while conducting faces of same brachium pontis to cause power supply direct short-circuit, transistor T 3 by SG3525A inside and 8 pin external capacitor C3 and latch are realized soft start, after controlling, export 2 road pwm pulse signals and control the conducting in turn of 4 power switch pipes, thereby realize inverter voltage and reverse frequency,
Described drive circuit is amplified to and is enough to drive IGBT the pwm pulse signal of described control circuit output, and control circuit and inverter circuit are carried out to photoelectricity isolation;
Described three-phase alternating current comprises A, B, the C three-phase alternating current signal of telecommunication of being come in by electrical network, is load supply power after described inverter circuit inversion;
Described surge absorbing circuit comprises the first resistance, the second resistance, the 3rd resistance and the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, and described surge absorbing circuit can prevent that the high order harmonic component on electrical network from scurrying into power supply;
The first diode and second diode of A end, the first resistance, the second electric capacity, the second resistance, the 4th electric capacity and the described current rectifying and wave filtering circuit of three-phase alternating current described in described the first electric capacity one termination; The 5th diode and the 6th diode of the C of three-phase alternating current end, the first resistance, the 3rd resistance, the 5th electric capacity, the 6th electric capacity and described current rectifying and wave filtering circuit described in another termination;
The 3rd diode and the 4th diode of the B of three-phase alternating current end, the 3rd resistance, the 6th electric capacity, the second resistance, the 4th electric capacity and described current rectifying and wave filtering circuit described in described the 3rd electric capacity one termination, another termination the 5th electric capacity, the second electric capacity, and ground connection;
Described current rectifying and wave filtering circuit comprises the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 4th resistance, relay switch, the first inductance, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the 5th resistance, the 6th resistance;
Described the 4th resistance one negative terminal of termination the first diode is, negative terminal and the relay switch of the negative terminal of the 3rd diode, the 5th diode, and the other end is succeeded appliance switch, the first inductance, the 7th electric capacity;
The 7th diode negative terminal of one termination the first inductance, the 5th resistance and the described inverter circuit of described the 8th electric capacity, another termination the 9th electric capacity, the 6th resistance, the 5th resistance;
Described the 9th electric capacity connects the anode of the anode of the second diode, the anode of the 4th diode and the 6th diode, the negative terminal of the 7th electric capacity and the 6th resistance;
In described current rectifying and wave filtering circuit first converts direct current to the 6th diode to alternating current, the 7th electric capacity, the first inductance and the 8th electric capacity, the 9th electric capacity form II mode filter, eight, the 9 two electrochemical capacitor connects to reduce the voltage that bears of single electric capacity, the 5th resistance and the 6th resistance play all pressure effects, the 4th resistance is current-limiting resistance, when system starts to power on, because electric capacity both end voltage is zero, therefore while just having started capacitor charging, electric current is very large, adds that current-limiting resistance after-current just can not be very large.When electric capacity both end voltage reaches certain numerical value, A.C. contactor is closed, by current-limiting resistance short circuit.System can normally be worked;
Described inverter circuit comprises the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 7th diode, the 8th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity;
Described the first power switch pipe collector connects negative terminal, the 3rd collector electrode of power switch pipe, the negative terminal of the 11 diode, the 12 electric capacity, the 9th resistance of the 7th resistance, the tenth electric capacity, the 7th diode; Emitter connect the anode of the 7th diode, the anode of the negative terminal of the 9th diode, load, the tenth diode, the collector electrode of the negative terminal of the 8th diode and the second power switch pipe;
Described the tenth electric capacity connects anode and the 8th resistance of the 9th diode, and the 7th resistance connects the negative terminal of the 11 electric capacity and the tenth diode;
The emitter of described the second power switch pipe connects anode, the 8th resistance, the 11 electric capacity, the 4th emitter of power switch pipe, the anode of the 12 diode, the tenth resistance, the 13 electric capacity of the 8th diode;
The emitter of described the 3rd power switch pipe connects the 11 anode of diode, the negative terminal of the 13 diode, the 14 anode of diode, collector electrode and the load of the negative terminal of the 12 diode, the 4th power switch pipe;
Described the 12 electric capacity connects anode, the tenth resistance of the 13 diode; The 9th resistance connects negative terminal, the 13 electric capacity of the 14 diode;
Described inverter circuit is the control output AC signal of telecommunication through four power switch pipes by the signal of telecommunication after rectifying and wave-filtering, the 7th resistance, the 9th diode, the tenth electric capacity, the 8th resistance is as the buffer circuit of the first power switch pipe, the 8th diode, the tenth diode, the 7th resistance, the 11 electric capacity is as the buffer circuit of the second power switch pipe, the 11 diode, the 12 electric capacity, the 13 diode and the tenth resistance are as the buffer circuit of the 3rd power switch pipe, the 12 diode, the 14 diode, the 9th resistance and the 13 electric capacity are as the buffer circuit of the 4th power switch pipe, the voltage trace of buffer circuit for the switching abnormal voltage that suppresses stray inductance in its inverter circuit and cause that high pressure produces with while turn-offing surpassed power switch pipe reverse bias voltage safe action region and can damage the protective circuit that element is done,
Described detection feedback circuit comprises instrument transformer, Qiao Dui, the 26 resistance, slide rheostat, the 14 electric capacity; By current transformer, from load, bring out ac signal, after rectifying and wave-filtering and voltage stabilizing, by regulating slide rheostat to give described control circuit feedback signal;
Described bridge heap exchanges end and connects instrument transformer, direct current termination the 14 electric capacity, and the 26 resistance connects slide rheostat, the direct current anode of another termination bridge heap;
Described control circuit comprises control chip SG3525A, the 15 electric capacity, the 16 electric capacity, the 17 electric capacity, the 18 electric capacity, the 19 electric capacity, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the first triode, the second triode, the 3rd triode, the 4th triode;
1 pin of described control chip SG3525A connects 9 pin by the 11 resistance, 2 pin connect 16 pin by the 12 resistance, 7 pin connect 5 pin by the 13 resistance, and by the 15 capacity earth, the 6th pin is by the 14 grounding through resistance, 8 pin are by the 16 capacity earth, 9 pin are by the 17 capacity earth, 10 pin access the slide rheostat of described detection feedback circuit, 11 pin connect the base stage of the first triode and the second triode, 12 pin ground connection, 13 pin and 15 pin connect 15V power supply, 14 pin connect the base stage of the 3rd triode and the 4th triode, 16 pin are by the 18 capacity earth,
The collector electrode of described the first triode and the 3rd triode connects 12V power supply, emitter connects the 15 resistance and the 17 resistance, the grounded collector of described the second triode and the 4th triode, emitter connects respectively the 16 resistance and the 18 resistance, the other end of the 15 resistance is connected with the 16 resistance, and export control signal OutB, the other end of the 17 resistance is connected with the 18 resistance, and exports control signal OutA;
Described drive circuit comprises four groups of drivings, four groups of structures are identical, therefore its three groups omissions, one group of drive circuit comprises driving chip HCPL316J, the 20 electric capacity, the 21 electric capacity, the 22 electric capacity, the 23 electric capacity, the 24 electric capacity, the 25 electric capacity, the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance;
1 pin of described driving chip HCPL316J meets control signal OutA, 2 pin connect the negative terminal of 5V power supply, 3 pin connect the anode of 5V power supply, 4 pin connect 3 pin by the 20 electric capacity, 6 pin connect 2 pin, and connect 3 pin by the 19 resistance, 8 pin connect 6 pin by the 21 electric capacity, 9 pin connect 16 pin by the 22 electric capacity, and connect the negative terminal of power supply 5V, positive termination 16 pin of 5V and the negative terminal of 15V, and signal is defeated by the emitter of the first power switch pipe, 11 pin connect 9 pin by the 20 resistance, by the 21 resistance, connect the grid of the first power switch pipe, 12 pin and 13 pin connect the anode of power supply 15V, 13 pin connect 9 pin by the 23 electric capacity, by the 24 electric capacity, connect 16 pin, 14 pin connect 16 pin by the 25 electric capacity, by the 24 resistance, connect the collector electrode of the first power switch pipe,
The ac converter circuit providing as the utility model, adopts soft start, zero-current switching, and over-voltage over-current protection improves the performance of inverter circuit by controlling Dead Time, and output voltage square wave provides power supply signal to Frequency Induction Heating.Adopt the utility model, reduced the switching loss of device, suppress peak voltage, guaranteed output pipe is better worked; Employing dead band is controlled, and realizes load impedance adjustment.
Accompanying drawing explanation
Fig. 1 is ac converter electrical block diagram of the present utility model.
Fig. 2 is the main circuit diagram of the ac converter circuit of the utility model Fig. 1.
Fig. 3 is feedback and the control circuit figure of the ac converter circuit of the utility model Fig. 1.
Fig. 4 is the drive circuit figure of the ac converter circuit of the utility model Fig. 1.
Fig. 5 is the circuit diagram that utilizes the induction heating power of the utility model exploitation.
Embodiment
Below in conjunction with accompanying drawing, the utility model content is further illustrated.
As shown in Figure 1, be the structure chart of the utility model ac converter circuit, comprise three-phase alternating current 1, surge absorbing circuit 3, current rectifying and wave filtering circuit 5, inverter circuit 7, load 9, detect feedback circuit 10, control circuit 12, drive circuit 14;
Described three-phase alternating current 1 is as the signal source of described load 9;
Described surge absorbing circuit 3 is processed the interference signal of described three-phase alternating current 1;
The three-phase ac signal 4 of described current rectifying and wave filtering circuit 5 after described surge absorbing circuit 3 is processed is transferred to described current rectifying and wave filtering circuit 5, and after rectifying and wave-filtering, d. c. voltage signal supplied with to described inverter circuit 7;
Described load 9 is to supply described load 9 by the AC signal 8 after described inverter circuit 7 inversions;
Described detection feedback circuit 10 is from load 9 ends, to induce alternating current by current transformer, and feedback signal, gives described control circuit 12 after whole ripple filtering and voltage stabilizing, realizes the overcurrent protection of power switch pipe;
Described control circuit 12 is that the signal of described detection feedback circuit 10 is delivered to described control circuit 12, by regulating the 6 pin resistance of control chip SG3525 to regulate and control the pwm pulse frequency of SG3525 output, by regulating 9 pin voltage swings to change output pulse width, by regulating dead band resistance, control Dead Time, in assurance, lower power switch pipe can not lead directly to, avoid 2 power switch pipes conducting simultaneously of same brachium pontis and cause power supply direct short-circuit, transistor T 3 by SG3525A inside and 8 pin external capacitor C3 and latch are realized soft start, after controlling, export 2 road pwm pulse signals and control the conducting in turn of 4 power switch pipes, thereby realize inverter voltage and reverse frequency,
Described drive circuit is amplified to and is enough to drive IGBT the pwm pulse signal of described control circuit output, and control circuit and inverter circuit are carried out to photoelectricity isolation.
As shown in Figure 2, be the main circuit diagram of the ac converter circuit of the utility model Fig. 1.
Described three-phase alternating current 1 comprises A, B, the c-power supply signal 2 of being come in by electrical network, through described inverter circuit 7 inversions, is load 9 supply powers;
Described surge absorbing circuit 3 comprises resistance 11, resistance 14, resistance 18 and electric capacity 12, electric capacity 13, electric capacity 15, electric capacity 16, electric capacity 17, electric capacity 19, and described surge absorbing circuit 3 can prevent that the high order harmonic component on electrical network from scurrying into power supply;
Diode 501 and the diode 502 of the A of three-phase alternating current 1 end, resistance 11, electric capacity 13, resistance 14, electric capacity 17 and described current rectifying and wave filtering circuit 5 described in described electric capacity 12 1 terminations; Diode 505 and the diode 506 of the C of three-phase alternating current 1 end, resistance 11, resistance 18, electric capacity 16, electric capacity 19 and described current rectifying and wave filtering circuit 5 described in another termination;
Diode 503 and the diode 504 of the B of three-phase alternating current 1 end, resistance 18, electric capacity 19, resistance 14, electric capacity 17 and described current rectifying and wave filtering circuit 5 described in described electric capacity 15 1 terminations, another termination capacitor 16, electric capacity 13, and ground connection;
Described current rectifying and wave filtering circuit 5 comprises diode 501, diode 502, diode 503, diode 504, diode 505, diode 506, resistance 507, relay switch 508, inductance 510, electric capacity 509, electric capacity 511, electric capacity 512, resistance 513, resistance 514;
Negative terminal and the relay switch 508 of the negative terminal of described resistance 507 1 terminating diodes 501, the negative terminal of diode 503, diode 505, the other end is succeeded appliance switch 508, inductance 510, electric capacity 509;
Diode 703 negative terminals of one termination inductance 510, resistance 513 and the described inverter circuit 7 of described electric capacity 511, another termination capacitor 512, resistance 514, resistance 513;
Described electric capacity 512 connects the anode of the anode of diode 502, the anode of diode 504 and diode 506, the negative terminal of electric capacity 509 and resistance 514;
The first to the 6th diode in described current rectifying and wave filtering circuit 5 converts direct current to alternating current, electric capacity 509, inductance 510 and electric capacity 511, electric capacity 512 forms II mode filter, II mode filter has the function of filtering, eliminate the ripple of output voltage, electric capacity 511, 512 connect to reduce the voltage that single electric capacity bears, resistance 513 and resistance 514 play all pressure effects, resistance 507 is current-limiting resistance, when system starts to power on, because electric capacity both end voltage is zero, therefore while just having started capacitor charging, electric current is very large, add that current-limiting resistance 507 after-currents just can not be very large.When electric capacity both end voltage reaches certain numerical value, A.C. contactor is closed, by current-limiting resistance 507 short circuits.System can normally be worked;
Described inverter circuit 7 comprises power switch pipe 701, power switch pipe 702, power switch pipe 712, power switch pipe 713, diode 703, diode 704, diode 705, diode 706, diode 714, diode 715, resistance 710, resistance 709, resistance 720, resistance 719, electric capacity 707, electric capacity 711, electric capacity 718, electric capacity 721;
Described power switch pipe 701 collector electrode connecting resistances 710, electric capacity 707, the negative terminal of diode 703, the negative terminal of the collector electrode of power switch pipe 712, diode 714, electric capacity 718, resistance 720; Emitter connect the anode of diode 703, the anode of the negative terminal of diode 705, load, diode 706, the collector electrode of the negative terminal of diode 704 and power switch pipe 702;
Described electric capacity 707 connects anode and the resistance 709 of diode 705, and resistance 710 connects the negative terminal of electric capacity 711 and diode 706;
The emitter of described power switch pipe 702 connects anode, resistance 709, electric capacity 711, the emitter of power switch pipe 713, the anode of diode 715, resistance 719, the electric capacity 721 of diode 704;
The emitter of described power switch pipe 712 connect the anode of diode 714, the anode of the negative terminal of diode 716, diode 717, collector electrode and the load of the negative terminal of diode 715, power switch pipe 713;
Described electric capacity 718 connects anode, the resistance 719 of diode 716; Resistance 720 connects negative terminal, the electric capacity 721 of diode 717;
Described inverter circuit 7 is the control output AC signals of telecommunication through four switching tubes by the signal of telecommunication after rectifying and wave-filtering, resistance 710, diode 705, electric capacity 707, resistance 709 are as the buffer circuit of power switch pipe 701, diode 704, diode 706, resistance 710, electric capacity 711 are as the buffer circuit of power switch pipe 702, diode 714, electric capacity 718, diode 716 and resistance 719 are as the buffer circuit of power switch pipe 712, and diode 715, diode 717, resistance 720 and electric capacity 721 are as the buffer circuit of power switch pipe 713; Buffer circuit absorbs and suppresses the overvoltage producing in power switch pipe switching process, restriction di/dt, reduce turn-on consumption, limit the turn-off power loss that peak voltage reduces device simultaneously, make switching tube work in safe action region, have portion of energy to be fed back simultaneously, grid at power switch pipe adds negative pressure, reduce the turn-off time, reduce the hear rate of pipe, guaranteed output pipe is better worked.
As shown in Figure 3, be feedback and the control circuit figure of the ac converter circuit of the utility model Fig. 1.
Described detection feedback circuit comprises instrument transformer 101, bridge heap 102, electric capacity 103, resistance 104, slide rheostat 105; By current transformer 101, from load, bring out ac signal, after rectifying and wave-filtering and voltage stabilizing, by regulating slide rheostat 105 to give described control circuit 12 feedback signal;
The interchange end of described bridge heap 102 connects instrument transformer 101, direct current termination capacitor 103, and resistance 104 connects slide rheostat 105, the direct current anode of another termination bridge heap 102;
Described control circuit 12 comprises control chip SG3525A, electric capacity 1202, electric capacity 1205, electric capacity 1207, electric capacity 1208, electric capacity 1209, resistance 1201, resistance 1203, resistance 1204, resistance 1206, resistance 1211, resistance 1212, resistance 1215, resistance 1216, triode 1210, triode 1213, triode 1214, triode 1217;
1 pin of described control chip SG3525A connects 9 pin by resistance 1201,2 pin connect 16 pin by resistance 1206,7 pin connect 5 pin by resistance 1204, and by electric capacity 1202 ground connection, the 6th pin is by resistance 1203 ground connection, 8 pin are by electric capacity 1205 ground connection, 9 pin are by electric capacity 1207 ground connection, 10 pin access the slide rheostat 105 of described detection feedback circuit 10,11 pin connect the base stage of triode 1214 and triode 1217,12 pin ground connection, and 13 pin and 15 pin connect 15V power supply, 14 pin connect the base stage of triode 1210 and triode 1213, and 16 pin are by electric capacity 1209 ground connection;
The collector electrode of described triode 1210 and triode 1214 connects 12V power supply, emitter connecting resistance 1211 and resistance 1215, the grounded collector of described triode 1213 and triode 1217, emitter is connecting resistance 1212 and resistance 1216 respectively, the other end of resistance 1212 is connected with resistance 1211, and export control signal OutB, the other end of resistance 1216 is connected with resistance 1215, and exports control signal OutA.
As shown in Figure 4, be the drive circuit figure of the ac converter circuit of the utility model Fig. 1.
Described drive circuit comprises four groups of drivings, four groups of structures are identical, therefore its three groups omissions, one group of drive circuit comprises driving chip HCPL316J, electric capacity 1401, electric capacity 1402, electric capacity 1403, electric capacity 1404, electric capacity 1406, electric capacity 1407, resistance 1400, resistance 1405, resistance 1408, resistance 1409;
1 pin of described driving chip HCPL316J meets control signal OutA, 2 pin connect the negative terminal of 5V power supply, 3 pin connect the anode of 5V power supply, 4 pin connect 3 pin by electric capacity 1402, 6 pin connect 2 pin, and connect 3 pin by resistance 1400, 8 pin connect 6 pin by electric capacity 1401, 9 pin connect 16 pin by electric capacity 1406, and connect the negative terminal of power supply 5V, positive termination 16 pin of 5V and the negative terminal of 15V, and signal is defeated by the emitter of the first power switch pipe, 11 pin connect 9 pin by resistance 1408, by resistance 1409, connect the grid of the first power switch pipe, 12 pin and 13 pin connect the anode of power supply 15V, 13 pin connect 9 pin by electric capacity 1407, by electric capacity 1403, connect 16 pin, 14 pin connect 16 pin by electric capacity 1404, by resistance 1405, connect the collector electrode of the first power switch pipe,
The method that produces the required ac signal of load, comprises the steps:
(1) described three-phase alternating current 1 provides power supply signal 2 for described current rectifying and wave filtering circuit 5;
(2) after the interference signal of described surge absorbing circuit 3 absorption filtering three-phase alternating currents 1, the ac signal 4 of high-quality is provided to described current rectifying and wave filtering circuit 5;
(3) described current rectifying and wave filtering circuit 5 is after ac signal 4 rectifying and wave-filterings, to become DC signal 6, for power switch pipe provides collector electrode, provides power supply;
(4) described inverter circuit 7 is that described DC signal is reverse into the required ac converter signal 8 of load 9, specific works, when power switch pipe 701 and 713 conducting, at load two ends, produce a positive voltage, when power switch pipe 702 and 712 conducting, at load two ends, produce a negative voltage, at load two ends, produce an ac square wave signal, because load is inductive load, and the electric current producing is the current signal of near sinusoidal ripple;
(5) described detection feedback circuit 10 utilizes current transformer detection to flow through the signal of load, and feedback signal 11 is transferred to control circuit 12;
(6) described control circuit 12 produces and controls 2 road pwm pulse signals 13 and provide signal for described drive circuit, controls the break-make of 4 power switch pipes, realizes voltage inversion and frequency inversion;
(7) 14 pairs of described pwm pulse signals 13 of described drive circuit amplify, and produce the signal 15 of enough driving power switching tubes, and described control circuit and main circuit are isolated;
(8) power switch pipe in described ac converter circuit is selected and is had the pipe from the IGBT of turn-off function, RCD in buffer circuit selects without sensing unit, control chip is selected the SG3525A with functions such as under-voltage, soft starts, drives chip to select undersaturation to detect and the photoelectric coupling driving element HCPL-316J of malfunction feedback.
As shown in Figure 5, for utilizing the circuit diagram of the induction heating power of the utility model exploitation.
The utility model discloses a kind of ac converter circuit, and describe embodiment of the present utility model and effect with reference to the accompanying drawings.Should be understood that: above-described embodiment is just to explanation of the present utility model, rather than to restriction of the present utility model, any utility model not exceeding within the scope of the utility model connotation is created, within all falling into the utility model protection range.
Claims (8)
1. ac converter circuit, is characterized in that comprising three-phase alternating current, surge absorbing circuit, current rectifying and wave filtering circuit, inverter circuit, load, detection feedback circuit, control circuit, drive circuit;
Described three-phase alternating current provides the signal of telecommunication for described load;
Described surge absorbing circuit is processed the interference signal of described three-phase alternating current;
Described current rectifying and wave filtering circuit the three-phase ac signal of described surge absorbing circuit output after described current rectifying and wave filtering circuit rectifying and wave-filtering for described inverter circuit provides d. c. voltage signal;
Described load is to supply with described load by the square wave voltage signal after described inverter circuit inversion;
Described detection feedback circuit is from load end, to induce alternating current by current transformer, and feedback signal, gives described control circuit after treatment;
Described control circuit is that the signal of described detection feedback circuit is delivered to described control circuit, by regulating the 6 pin resistance sizes of control chip SG3525 can regulate and control the pwm pulse frequency of SG3525 output, by regulating 9 pin voltages to change output pulse width, by regulating dead band resistance, control Dead Time, avoid 2 power switch pipes while conducting faces of same brachium pontis to cause power supply direct short-circuit, transistor T 3 by SG3525A inside and 8 pin external capacitor C3 and latch are realized soft start, after controlling, export 2 road pwm pulse signals and control the conducting in turn of 4 power switch pipes, thereby realize inverter voltage and reverse frequency,
Described drive circuit is amplified to and is enough to drive IGBT the pwm pulse signal of described control circuit output, and control circuit and inverter circuit are carried out to photoelectricity isolation.
2. ac converter circuit as claimed in claim 1, is characterized in that three-phase alternating current comprises A, B, the C three-phase alternating current signal of telecommunication of being come in by electrical network, through described inverter circuit inversion, provides electric signal source for load.
3. ac converter circuit as claimed in claim 1, it is characterized in that surge absorbing circuit comprises the first resistance, the second resistance, the 3rd resistance and the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, described surge absorbing circuit can prevent that the high order harmonic component on electrical network from scurrying into power supply;
The first diode and second diode of A end, the first resistance, the second electric capacity, the second resistance, the 4th electric capacity and the described current rectifying and wave filtering circuit of three-phase alternating current described in described the first electric capacity one termination; The 5th diode and the 6th diode of the C of three-phase alternating current end, the first resistance, the 3rd resistance, the 5th electric capacity, the 6th electric capacity and described current rectifying and wave filtering circuit described in another termination;
The 3rd diode and the 4th diode of the B of three-phase alternating current end, the 3rd resistance, the 6th electric capacity, the second resistance, the 4th electric capacity and described current rectifying and wave filtering circuit described in described the 3rd electric capacity one termination, another termination the 5th electric capacity, the second electric capacity, and ground connection.
4. ac converter circuit as claimed in claim 1, is characterized in that current rectifying and wave filtering circuit comprises the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 4th resistance, relay switch, the first inductance, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the 5th resistance, the 6th resistance;
Described the 4th resistance one negative terminal of termination the first diode is, negative terminal and the relay switch of the negative terminal of the 3rd diode, the 5th diode, and the other end is succeeded appliance switch, the first inductance, the 7th electric capacity;
The 7th diode negative terminal of one termination the first inductance, the 5th resistance and the described inverter circuit of described the 8th electric capacity, another termination the 9th electric capacity, the 6th resistance, the 5th resistance;
Described the 9th electric capacity connects the anode of the anode of the second diode, the anode of the 4th diode and the 6th diode, the negative terminal of the 7th electric capacity and the 6th resistance;
In described current rectifying and wave filtering circuit first converts direct current to the 6th diode to alternating current, the 7th electric capacity, the first inductance and the 8th electric capacity, the 9th electric capacity forms II mode filter, II mode filter has the function of filtering, eliminate the ripple of output voltage, the 8th, the 9 two electrochemical capacitor connects to reduce the voltage that single electric capacity bears, the 5th resistance and the 6th resistance play all pressure effects, the 4th resistance is current-limiting resistance, when system starts to power on, because electric capacity both end voltage is zero, therefore while just having started capacitor charging, electric current is very large, add that current-limiting resistance after-current has just diminished, when electric capacity both end voltage reaches certain numerical value, A.C. contactor is closed, by current-limiting resistance short circuit, system can normally be worked.
5. ac converter circuit as claimed in claim 1, is characterized in that inverter circuit comprises the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 7th diode, the 8th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity;
Described the first power switch pipe collector connects negative terminal, the 3rd collector electrode of power switch pipe, the negative terminal of the 11 diode, the 12 electric capacity, the 9th resistance of the 7th resistance, the tenth electric capacity, the 7th diode; Emitter connect the anode of the 7th diode, the anode of the negative terminal of the 9th diode, load, the tenth diode, the collector electrode of the negative terminal of the 8th diode and the second power switch pipe;
Described the tenth electric capacity connects anode and the 8th resistance of the 9th diode, and the 7th resistance connects the negative terminal of the 11 electric capacity and the tenth diode;
The emitter of described the second power switch pipe connects anode, the 8th resistance, the 11 electric capacity, the 4th emitter of power switch pipe, the anode of the 12 diode, the tenth resistance, the 13 electric capacity of the 8th diode;
The emitter of described the 3rd power switch pipe connects the 11 anode of diode, the negative terminal of the 13 diode, the 14 anode of diode, collector electrode and the load of the negative terminal of the 12 diode, the 4th power switch pipe;
Described the 12 electric capacity connects anode, the tenth resistance of the 13 diode; The 9th resistance connects negative terminal, the 13 electric capacity of the 14 diode;
Described inverter circuit is by the output AC signal of telecommunication after the control of four power switch pipes of the signal of telecommunication after rectifying and wave-filtering, the 7th resistance, the 9th diode, the tenth electric capacity, the 8th resistance is as the buffer circuit of the first power switch pipe, the 8th diode, the tenth diode, the 7th resistance, the 11 electric capacity is as the buffer circuit of the second power switch pipe, the 11 diode, the 12 electric capacity, the 13 diode and the tenth resistance are as the buffer circuit of the 3rd power switch pipe, the 12 diode, the 14 diode, the 9th resistance and the 13 electric capacity are as the buffer circuit of the 4th power switch pipe, buffer circuit absorbs and suppresses the overvoltage producing in power switch pipe switching process, restriction di/dt, reduce turn-on consumption, limit the turn-off power loss that peak voltage reduces device simultaneously, make switching tube work in safe action region, have portion of energy to be fed back simultaneously, grid at power switch pipe adds negative pressure, reduce the turn-off time, reduce the hear rate of pipe, guaranteed output pipe is better worked.
6. ac converter circuit as claimed in claim 1, is characterized in that detecting feedback circuit and comprises instrument transformer, Qiao Dui, the 26 resistance, slide rheostat, the 14 electric capacity; By current transformer, from load, bring out ac signal, after rectifying and wave-filtering and voltage stabilizing, by regulating slide rheostat to give described control circuit feedback signal;
Described bridge heap exchanges end and connects instrument transformer, direct current termination the 14 electric capacity, and the 26 resistance connects slide rheostat, the direct current anode of another termination bridge heap.
7. ac converter circuit as claimed in claim 1, is characterized in that control circuit comprises control chip SG3525A, the 15 electric capacity, the 16 electric capacity, the 17 electric capacity, the 18 electric capacity, the 19 electric capacity, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the first triode, the second triode, the 3rd triode, the 4th triode;
1 pin of described control chip SG3525A connects 9 pin by the 11 resistance, 2 pin connect 16 pin by the 12 resistance, 7 pin connect 5 pin by the 13 resistance, and by the 15 capacity earth, the 6th pin is by the 14 grounding through resistance, 8 pin are by the 16 capacity earth, 9 pin are by the 17 capacity earth, 10 pin access the slide rheostat of described detection feedback circuit, 11 pin connect the base stage of the first triode and the second triode, 12 pin ground connection, 13 pin and 15 pin connect 15V power supply, 14 pin connect the base stage of the 3rd triode and the 4th triode, 16 pin are by the 18 capacity earth,
The collector electrode of described the first triode and the 3rd triode connects 12V power supply, emitter connects the 15 resistance and the 17 resistance, the grounded collector of described the second triode and the 4th triode, emitter connects respectively the 16 resistance and the 18 resistance, the other end of the 15 resistance is connected with the 16 resistance, and export control signal OutB, the other end of the 17 resistance is connected with the 18 resistance, and exports control signal OutA.
8. ac converter circuit as claimed in claim 1, it is characterized in that drive circuit comprises four groups of drivings, four groups of structures are identical, when describing, only describe one group, one group of drive circuit comprises driving chip HCPL316J, the 20 electric capacity, the 21 electric capacity, the 22 electric capacity, the 23 electric capacity, the 24 electric capacity, the 25 electric capacity, the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance;
1 pin of described driving chip HCPL316J meets control signal OutA, 2 pin connect the negative terminal of 5V power supply, 3 pin connect the anode of 5V power supply, 4 pin connect 3 pin by the 20 electric capacity, 6 pin connect 2 pin, and connect 3 pin by the 19 resistance, 8 pin connect 6 pin by the 21 electric capacity, 9 pin connect 16 pin by the 22 electric capacity, and connect the negative terminal of power supply 5V, positive termination 16 pin of 5V and the negative terminal of 15V, and signal is defeated by the emitter of the first power switch pipe, 11 pin connect 9 pin by the 20 resistance, by the 21 resistance, connect the grid of the first power switch pipe, 12 pin and 13 pin connect the anode of power supply 15V, 13 pin connect 9 pin by the 23 electric capacity, by the 24 electric capacity, connect 16 pin, 14 pin connect 16 pin by the 25 electric capacity, by the 24 resistance, connect the collector electrode of the first power switch pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420137277.4U CN203840210U (en) | 2014-03-24 | 2014-03-24 | AC inverter circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420137277.4U CN203840210U (en) | 2014-03-24 | 2014-03-24 | AC inverter circuit |
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| CN203840210U true CN203840210U (en) | 2014-09-17 |
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| CN201420137277.4U Expired - Fee Related CN203840210U (en) | 2014-03-24 | 2014-03-24 | AC inverter circuit |
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| CN104601006A (en) * | 2015-03-02 | 2015-05-06 | 湖南中科电气股份有限公司 | Special power source for composite electromagnetism constraint vibration device and control method of special power source |
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| CN112514192A (en) * | 2018-08-16 | 2021-03-16 | 伊顿智能动力有限公司 | AC/DC converter |
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| CN110497063B (en) * | 2019-08-02 | 2021-09-10 | 上海沪工焊接集团股份有限公司 | Adaptive control circuit and control method for inversion frequency |
| CN111273585A (en) * | 2020-02-26 | 2020-06-12 | 佛山市斯特美光电科技有限公司 | Power signal processing circuit and power utilization system |
| CN111935862A (en) * | 2020-08-12 | 2020-11-13 | 上海恒精感应科技股份有限公司 | Intelligent induction heating power supply |
| CN114640086A (en) * | 2020-12-15 | 2022-06-17 | 无锡蓝海华腾技术有限公司 | Over-current soft turn-off circuit and motor controller |
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