CN101478142B - Power switch tube protecting circuit in semi-bridge induction heating circuit - Google Patents
Power switch tube protecting circuit in semi-bridge induction heating circuit Download PDFInfo
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- CN101478142B CN101478142B CN2008102200613A CN200810220061A CN101478142B CN 101478142 B CN101478142 B CN 101478142B CN 2008102200613 A CN2008102200613 A CN 2008102200613A CN 200810220061 A CN200810220061 A CN 200810220061A CN 101478142 B CN101478142 B CN 101478142B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 230000006698 induction Effects 0.000 title abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 38
- 230000001939 inductive effect Effects 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 230000009466 transformation Effects 0.000 abstract 4
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Abstract
The invention relates to an induction heating electric circuit, which belongs to the technical field of circuit protection. The induction heating electric circuit comprises a current resonance circuit, a signal transformation circuit, a rectification circuit and a combinational logic circuit, wherein, the output terminal of the current resonance circuit is connected with the input terminal of thesignal transformation circuit, and the output terminal of the signal transformation circuit is connected with the input terminal of the rectification circuit; and the induction heating electric circuit further comprises a phase-discrimination pulse generation circuit, the input terminal of the phase-discrimination pulse generation circuit is connected with the output terminal of the rectificationcircuit, the output terminal of the phase-discrimination pulse generation circuit is connected with the input terminal of the combinational logic circuit, and the output terminal of the combinationallogic circuit is connected with the current resonance circuit. On the basis of the conventional current resonance circuit, the direct-current voltage signal is generated by using the signal transformation circuit and the rectification circuit, the phase-discrimination pulse is generated by using the phase-discrimination pulse generation circuit, and the phase-discrimination pulse plays the role of protecting the power transistor by forcing the power transistor in the current resonance circuit to be cut off in advance before the current value is naturally reduced to zero under the action of the combinational logic circuit.
Description
Technical field
The invention belongs to the circuit protection technical field of inductive heating circuit, particularly a kind of the detection by current phase realized circuit that the power switch pipe of half-bridge inductive heating circuit is protected.
Technical background
The semibridge system inductive heating circuit is a kind of topological structure the most frequently used in the current induction heating technique field, is mainly become with the resonance capacitance group by two power switch pipes.This technology topology is simple in structure, and control mode is flexible, high efficiency.The circuit that it all is the power height generally that but this technology adopts, electric current is big, main is that wherein power switch pipe is all started working under zero current, zero voltage condition.And if one of them power switch pipe is to turn-off when electric current reduces to zero naturally again, opening of another switching tube is not at zero current just so, realize under the zero voltage condition, so under big current work condition, the power switch pipe loss is big, temperature rise can cause power switch pipe to be burnt when serious.
In the prior art; the steady operation of semibridge system induction heating needs a lot of protective circuits to guarantee; existing protective circuit comprises the peak current protective circuit; frequency-tracking protective circuit or the like; but the electric current phase discriminator does not also appear, to guarantee that power switch pipe was forced to turn-off before electric current reduces to zero naturally.
Summary of the invention
Purpose of the present invention is exactly at deficiency of the prior art; a kind of power switch tube protecting circuit of design in existing semibridge system inductive heating circuit; can realize that power switch pipe was forced to turn-off before electric current reduces to zero naturally, thereby can better protect power switch pipe.
In order to solve the problems of the technologies described above, the present invention includes following technical scheme: the power switch tube protecting circuit in a kind of half-bridge inductive heating circuit, comprise current resonance circuit, signal transition circuit, rectification circuit and combinational logic circuit, the output of described current resonance circuit is connected with the input of signal transition circuit, and the output of signal transition circuit links to each other with rectification circuit input end; Also comprise and before d. c. voltage signal is crossed no-voltage, to produce the phase discriminating pulse signal, act on the current resonance circuit to force the phase discriminating pulse generative circuit of switch-off power switching tube by combinational logic circuit, the input of described phase discriminating pulse generative circuit is connected with the output of rectification circuit, the output of phase discriminating pulse generative circuit is connected with the input of combinational logic circuit, and the output of combinational logic circuit is connected with the current resonance circuit.
Described phase discriminating pulse generative circuit comprises phase detecting circuit, synchronous output circuit, the output of described phase detecting circuit and synchronous output circuit by with logical relation after be connected the input of combinational logic circuit.
Described phase detecting circuit comprises comparator T41, resistance R 41, resistance R 42, resistance R 43, resistance R 44, capacitor C 41, capacitor C 42; The negative terminal of comparator T41 links to each other with an end of resistance R 41, capacitor C 41 respectively, and the other end of resistance R 41 links to each other with rectification circuit output end; The other end of capacitor C 41 respectively with the anode of comparator T41, resistance R 42, resistance R 43, an end of capacitor C 42 links to each other, resistance R 43 and capacitor C 42 ground connection afterwards in parallel, the other end connection supply voltage U1 of resistance R 42;
Described synchronous output circuit comprises comparator T42, resistance R 45, resistance R 46, capacitor C 44; The anode of comparator T42 is connected with triangle sawtooth signal Uj input, and the negative terminal of comparator T42 is connected with an end of resistance R 45, resistance R 46, capacitor C 44 respectively; Resistance R 46 other ends connect supply voltage U1, resistance R 45 and capacitor C 44 back in parallel ground connection;
The output of comparator T42 is connected with supply voltage U1 by resistance R 44 with after the output of comparator T41 is connected, and is connected with the input of combinational logic circuit by diode D41.
Described synchronous output circuit also comprises triode Q41, and the base stage of described triode Q41 is connected with civil power zero passage voltage signal U3 end, and emitter-base bandgap grading is connected with power supply ground, and collector electrode is connected with the output of comparator T42.
The power switch pipe of described current resonance circuit setting is IGBT pipe or MOSFET pipe.
Described signal transition circuit comprises that a side is connected the current transformer on the current resonance circuit.
Described rectification circuit is a bridge rectifier.
Described combinational logic circuit comprises resistance R 51, resistance R 52, capacitor C 53, capacitor C 54, voltage stabilizing didoe D51 and integrated chip X1;
3 pin of described integrated chip X1 connect diode D41 negative electrode and voltage stabilizing didoe D51 negative electrode, and voltage stabilizing didoe D51 anode is connected back ground connection with 1 pin, 16 pin of integrated chip X1; 2 pin of integrated chip X1,13 pin, 14 pin link to each other by outside each other with 15 pin; 8 pin of integrated chip X1 connect supply voltage U1;
Capacitor C 53, C54 compose in parallel behind the filter circuit one end and link to each other with 12 pin of integrated chip X1 and is connected supply voltage U1, and the other end of capacitor C 53, C54 is connected ground connection afterwards respectively with 11 pin of integrated chip X1; 9 pin of integrated chip X1,10 pin output IGBT drive signal, and link to each other with the input control pin of current resonance circuit by resistance R 51, R52 respectively.
Compared with prior art, the present invention with the ac current signal in the semibridge system current resonance circuit respectively successively by being converted into d. c. voltage signal behind signal transition circuit and the rectification circuit.In the phase discriminating pulse generative circuit, reference voltage is set according to the expectation phase place; utilize comparator to allow this d. c. voltage signal and reference voltage compare; thereby allow ac current signal in the semibridge system current resonance circuit before reducing to zero naturally by phase discriminating pulse of comparator output; this phase discriminating pulse is under the combinational logic circuit effect; pressure allows the power switch pipe in the semibridge system current resonance circuit turn-off in advance before current value reduces to zero naturally, plays the effect of protection power switch pipe.Sort circuit realizes that principle is simply effective, and cost is low, and is safe and reliable.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is the circuit theory diagrams of the embodiment of the invention;
Fig. 4 A is the oscillogram of T for the cycle of ac current signal in the semibridge system current resonance circuit of the present invention;
Fig. 4 B is the oscillogram of T by the cycle that is converted into d. c. voltage signal Up behind signal transition circuit, the rectification circuit for ac current signal of the present invention successively.
Embodiment
As shown in Figure 1, comprise semibridge system current resonance circuit 1, signal transition circuit 2, rectification circuit 3, phase discriminating pulse generative circuit 4 and combinational logic circuit 5, wherein the output of current resonance circuit 1 is connected with the input of signal transition circuit 2, the output of signal transition circuit 2 links to each other with rectification circuit 3 inputs, phase discriminating pulse generative circuit 4 inputs connect the output of rectification circuit 3, the output of phase discriminating pulse generative circuit 4 connects the input of combinational logic circuit 5, and the output of combinational logic circuit 5 is connected with current resonance circuit 1.
Two power switch pipes are arranged in the semibridge system current resonance circuit 1, and power switch pipe in the present embodiment adopts IGBT, is each positioned at up and down on two brachium pontis.Shown in Fig. 4 A, the cycle of supposing each ac current signal in the semibridge system current resonance circuit 1 is T, then respectively work half period, i.e. T/2 of the IGBT1 of upper and lower bridge arm, IGBT2.First cycle was the last brachium pontis IGBT1 work period, and the time is 0-T/2, and second cycle is the following brachium pontis IGBT2 work period, and the time is T/2-T;
Shown in Fig. 4 B, by being converted into d. c. voltage signal Up behind signal transition circuit 2, the rectification circuit 3, frequency is the twice of ac current signal to this ac current signal successively, and phase place lags behind ac current signal a little.The previous cycle was the last brachium pontis IGBT1 work period, and the time is 0-T/2, and back one-period is the following brachium pontis IGBT2 work period, and the time is T/2-T.
Circuit function of the present invention is to allow d. c. voltage signal Up (being T/4-T/2 and 3T/4-T period in cycle) before crossing no-voltage produce the high level pulse signal; this time pulse signal is wanted long enough; be that the phase demodulation phase place is big; before reducing to zero naturally, force to turn-off IGBT with the realization ac current signal, thereby reach the effect of protection IGBT.
Shown in the circuit theory diagrams of Fig. 3 embodiment of the invention, wherein each electric elements and the logic connecting relation thereof in semibridge system current resonance circuit 1, signal transition circuit 2, the rectification circuit 3 is custom circuit, repeats no more.Described phase discriminating pulse generative circuit 4 comprises comparator T41, T42, resistance R 41, R42, R43, R44, R45, R46, R47, diode D41, capacitor C 41, C42, C43, C44, triode Q41.
The negative terminal of comparator T41 links to each other with an end of resistance R 41, capacitor C 41 respectively, and the other end of resistance R 41 links to each other with rectification circuit 3 outputs; The other end of capacitor C 41 respectively with the anode of comparator T41, resistance R 42, resistance R 43, an end of capacitor C 42 links to each other, resistance R 43 and capacitor C 42 ground connection afterwards in parallel, the other end connection Switching Power Supply U1 of resistance R 42.
The output of comparator T41 links to each other with capacitor C 43, resistance R 44, diode D41 anode, triode Q41 collector electrode, comparator T42 output respectively.The other end ground connection of capacitor C 43, the other end of resistance R 44 connects Switching Power Supply U1, and diode D41 negative electrode is as the phase discriminating pulse output, triode Q41 grounded emitter.A civil power zero passage voltage signal U3 is connected to triode Q41 base stage by resistance R 47.
Triangle sawtooth signal Uj is input to the anode of comparator T42, and the negative terminal of comparator T42 is connected with an end of resistance R 45, R46, capacitor C 44 respectively.The R46 other end connects Switching Power Supply U1, resistance R 45 and capacitor C 44 back in parallel ground connection.
Combinations thereof logical circuit 5 comprises resistance R 51, R52; Capacitor C 53, C54; Voltage stabilizing didoe D51 and an integrated chip X1.
Wherein 3 pin of integrated chip X1 connect diode D41 negative electrode and voltage stabilizing didoe D51 negative electrode, and voltage stabilizing didoe D51 anode is connected back ground connection with 1 pin, 16 pin of integrated chip X1.2 pin of integrated chip X1,13 pin, 14 pin link to each other by outside each other with 15 pin.8 pin of integrated chip X1 connect supply voltage U1.Capacitor C 53, C54 compose in parallel behind the filter circuit one end and link to each other with 12 pin of integrated chip X1 and is connected supply voltage U1, and the other end of capacitor C 53, C54 is connected ground connection afterwards respectively with 11 pin of integrated chip X1.9 pin of integrated chip X1,10 pin output IGBT drive signal, and link to each other with the input control pin of integrated chip IR2113 by resistance R 51, R52 respectively.
Have only as comparator T41; when the T42 anode is higher than negative terminal voltage; and under the condition that triode Q41 ends; could be by voltage source U1 by resistance R 44; diode D41 output high level phase discriminating pulse is given the integrated chip X1 in the combinational logic circuit 5; 9 pin of integrated chip X1 and 10 pin can be exported two low level signals; by resistance R 51; after the R52 current limliting; be transferred to chip I R2113 respectively; then IR2113 can export two low level signals; make IGBT1; IGBT2 ends; before reducing to zero naturally, force to turn-off IGBT with the realization ac current signal, thereby reach the effect of protection IGBT.
If the negative terminal among any one among T41, the T42 or two is than positive terminal voltage height, or triode Q41 conducting, then diode D41 output low level signal is given the integrated chip X1 in the combinational logic circuit 5, one of them output high level signal of 9 pin of integrated chip X1 and 10 pin, another output low level signal, after resistance R 51, R52 current limliting, be transferred to chip I R2113 respectively, then IR2113 one of them output high level signal, another output low level signal, make IGBT1, IGBT2 always have one to be in conducting, i.e. normal operating conditions.
The effect of comparator T42 is to make the time that produces this high level phase discriminating pulse between T/4-T/2 or 3T/4-T, also is that d. c. voltage signal Up is before crossing no-voltage.Implementation method is: supply voltage U1 provides a fixed reference voltage U i for the T42 negative terminal by divider resistance R46, R45, and the T42 anode inserts triangle sawtooth signal Uj.When Uj＞Ui, voltage waveform is between T/4-T/2 or the 3T/4-T, so the time that produces phase discriminating pulse is between T/4-T/2 or 3T/4-T.
The effect of comparator T41 is to obtain expectation phase place t between T/4-T/2 or 3T/4-T, and implementation method is: supply voltage U1 provides fixed reference voltage U k for comparator T41 anode by divider resistance R42, R43, and negative terminal inserts d. c. voltage signal Up.Suppose that the d. c. voltage signal amplitude is Upmax, then during Uk=0-1/3Upmax, can obtain expectation phase place t.
That the base stage of triode Q41 inserts is civil power zero passage voltage signal U3, and operating frequency is 100HZ.The effect of this signal is that the electric current phase demodulation apparatus of semibridge system inductive heating circuit when not allowing line voltage signal zero passage works, and protects phenomenon in order to avoid mistake occurs.Be high level when this signal occurs, the time is very short, and triode Q41 can conducting.Most of the time is a low level, and triode Q41 ends.So in the complete machine work overwhelming majority time, triode Q41 is a cut-off state.
Claims (8)
1. the power switch tube protecting circuit in the half-bridge inductive heating circuit, comprise current resonance circuit (1), signal transition circuit (2), rectification circuit (3) and combinational logic circuit (5), the output of described current resonance circuit (1) is connected with the input of signal transition circuit (2), and the output of signal transition circuit (2) links to each other with rectification circuit (3) input; It is characterized in that: also comprise before d. c. voltage signal is crossed no-voltage, to produce the phase discriminating pulse signal, acting on current resonance circuit (1) to force the phase discriminating pulse generative circuit (4) of switch-off power switching tube by combinational logic circuit (5), the input of described phase discriminating pulse generative circuit (4) is connected with the output of rectification circuit (3), the output of phase discriminating pulse generative circuit (4) is connected with the input of combinational logic circuit (5), and the output of combinational logic circuit (5) is connected with current resonance circuit (1).
2. the power switch tube protecting circuit in the half-bridge inductive heating circuit according to claim 1; it is characterized in that: described phase discriminating pulse generative circuit (4) comprises phase detecting circuit (41), synchronous output circuit (42), the output of described phase detecting circuit (41) and synchronous output circuit (42) by with logical relation after be connected the input of combinational logic circuit (5).
3. the power switch tube protecting circuit in the half-bridge inductive heating circuit according to claim 2 is characterized in that: described phase detecting circuit (41) comprises comparator T41, resistance R 41, resistance R 42, resistance R 43, resistance R 44, capacitor C 41, capacitor C 42; The negative terminal of comparator T41 links to each other with an end of resistance R 41, capacitor C 41 respectively, and the other end of resistance R 41 links to each other with rectification circuit (3) output; The other end of capacitor C 41 respectively with the anode of comparator T41, resistance R 42, resistance R 43, an end of capacitor C 42 links to each other, resistance R 43 and capacitor C 42 ground connection afterwards in parallel, the other end connection supply voltage U1 of resistance R 42;
Described synchronous output circuit (42) comprises comparator T42, resistance R 45, resistance R 46, capacitor C 44; The anode of comparator T42 is connected with triangle sawtooth signal Uj input, and the negative terminal of comparator T42 is connected with an end of resistance R 45, resistance R 46, capacitor C 44 respectively; Resistance R 46 other ends connect supply voltage U1, resistance R 45 and capacitor C 44 back in parallel ground connection;
The output of comparator T42 is connected with supply voltage U1 by resistance R 44 with after the output of comparator T41 is connected, and is connected with the input of combinational logic circuit (5) by diode D41.
4. the power switch tube protecting circuit in the half-bridge inductive heating circuit according to claim 3; it is characterized in that: described synchronous output circuit (42) also comprises triode Q41; the base stage of described triode Q41 is connected with civil power zero passage voltage signal U3 end; emitter-base bandgap grading connects power supply ground, and collector electrode is connected with the output of comparator T42.
5. according to the power switch tube protecting circuit in each described half-bridge inductive heating circuit of claim 1 to 4, it is characterized in that: the power switch pipe that described current resonance circuit (1) is provided with is IGBT pipe or MOSFET pipe.
6. the power switch tube protecting circuit in the half-bridge inductive heating circuit according to claim 5 is characterized in that: described signal transition circuit (2) comprises that a side is connected the current transformer on the current resonance circuit (1).
7. the power switch tube protecting circuit in the half-bridge inductive heating circuit according to claim 6 is characterized in that: described rectification circuit (3) is a bridge rectifier.
8. the power switch tube protecting circuit in the half-bridge inductive heating circuit according to claim 7 is characterized in that: described combinational logic circuit (5) comprises resistance R 51, resistance R 52, capacitor C 53, capacitor C 54, voltage stabilizing didoe D51 and integrated chip X1;
3 pin of described integrated chip X1 connect diode D41 negative electrode and voltage stabilizing didoe D51 negative electrode, and voltage stabilizing didoe D51 anode is connected back ground connection with 1 pin, 16 pin of integrated chip X1; 2 pin of integrated chip X1,13 pin, 14 pin link to each other by outside each other with 15 pin; 8 pin of integrated chip X1 connect supply voltage U1;
12 pin of one end and integrated chip X1 link to each other and are connected supply voltage U1 after capacitor C 53, the C54 parallel connection, and the other end of capacitor C 53, C54 is connected ground connection afterwards respectively with 11 pin of integrated chip X1; 9 pin of integrated chip X1,10 pin output IGBT drive signal, and link to each other with current resonance circuit (1) input control pin by resistance R 51, R52 respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102200613A CN101478142B (en) | 2008-12-16 | 2008-12-16 | Power switch tube protecting circuit in semi-bridge induction heating circuit |
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| CN2008102200613A CN101478142B (en) | 2008-12-16 | 2008-12-16 | Power switch tube protecting circuit in semi-bridge induction heating circuit |
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| CN101478142B true CN101478142B (en) | 2011-08-10 |
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| CN104578721B (en) * | 2014-12-27 | 2017-03-15 | 芜湖国睿兆伏电子有限公司 | Zero passage soft switching control circuit |
| US10524508B2 (en) * | 2016-11-15 | 2020-01-07 | Rai Strategic Holdings, Inc. | Induction-based aerosol delivery device |
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| CN101264545A (en) * | 2008-04-30 | 2008-09-17 | 北京工业大学 | Controlling circuit of zero voltage zero current soft-switching arc welding inverter |
| CN201336743Y (en) * | 2008-12-16 | 2009-10-28 | 美的集团有限公司 | Power switch tube protection circuit in half-bridge induction heating circuit |
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2008
- 2008-12-16 CN CN2008102200613A patent/CN101478142B/en active Active
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| CN2182505Y (en) * | 1994-01-24 | 1994-11-09 | 辽宁电子设备厂 | Whole-transistor type high frequency electric source apparatus for induction heating use |
| CN1661896A (en) * | 2004-01-21 | 2005-08-31 | 英特赛尔美国股份有限公司 | Multiphase converter with zero voltage switching |
| CN1560990A (en) * | 2004-03-11 | 2005-01-05 | 哈尔滨工业大学 | Single-level power factor correction all-bridge changer |
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