CN103296911A - Single pipe resonant type soft switch inversion circuit - Google Patents
Single pipe resonant type soft switch inversion circuit Download PDFInfo
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- CN103296911A CN103296911A CN2013102316752A CN201310231675A CN103296911A CN 103296911 A CN103296911 A CN 103296911A CN 2013102316752 A CN2013102316752 A CN 2013102316752A CN 201310231675 A CN201310231675 A CN 201310231675A CN 103296911 A CN103296911 A CN 103296911A
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- 230000010355 oscillation Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 4
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- 230000005674 electromagnetic induction Effects 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to an inversion circuit which comprises a main circuit and a control circuit. The main circuit comprises an LC resonant network formed by connecting an isolation diode VD, an inductor L and a capacitor C in parallel, a switch tube VT and a return stroke diode VD0. Fed back sampling voltage signals are taken from the voltage to ground at the anode end of the switch tube VT, a control circuit controls the switch tube VT to be connected and disconnected, zero voltage connection of the switch tube VT is achieved, the LC resonant network is located in the resonant state, positive and negative voltage in semi-circle symmetry can be output accordingly, and the oscillation amplitude and the output power and the connection time of the switch tube VT are in direct proportion.
Description
Technical field
The invention provides a kind of single tube resonant mode soft-switching inversion circuit, relate to the transformation of electrical energy field, can be widely used in fields such as electromagnetic induction heating, gaseous discharge lamp, high pressure generation; Resonant inductance and resonant capacitance are connected in parallel and are in the operating state of resonance, and its oscillation amplitude and power output are directly proportional with the ON time of switching tube.
Background technology
The inverter circuit that direct current is converted to the alternating current of certain frequency is the transformation of electrical energy circuit of the essential and extensive use of society now, wherein the inverter circuit of connecting with switching tube again after resonant capacitance and the inductance parallel connection, because of simple in structure, control is convenient, low cost and other advantages and being used widely, but existing this inverter circuit works in zero current passing quasi-resonance state, and the sampled voltage signal of circuit feedback is taken from the shunt-resonant circuit, the feedback control circuit complexity; Also having the voltage of its resonant inductance and electric capacity shunt circuit is half-sinusoid substantially, flip-flop is obvious, the quality of power supply of its inversion output is very coarse, only can be applied to less demanding load, electromagnetic induction heating for example, and have relatively high expectations for those, need the circuit of waveform positive-negative half-cycle symmetry can not use at all.
Summary of the invention
According to above prior art deficiency, the technical problem to be solved in the present invention is: the single tube resonant mode soft switch resonance type inverter circuit that a kind of efficient output AC electricity is provided.
The present invention solves the scheme that its technical problem adopts: the present invention connects isolating diode and switching tube and the inductance capacitance LC resonant network of forming that is connected in parallel, the sampled voltage signal of feedback is taken from the voltage to earth of switching tube positive terminal, control by control circuit, make the switch tube zero voltage turn-on, the LC resonant network is in resonance condition, thus the voltage of output positive-negative half-cycle symmetry.
The invention provides a kind of single tube resonant mode soft-switching inversion circuit, it comprises main circuit and control circuit two parts, its main circuit structure is characterized as: circuit is input as direct current, resonant inductance and resonant capacitance are connected in parallel and form the LC resonant network, isolating diode and switching tube and resonant network are connected in series, the anodal DC potential of isolating diode and switching tube is higher than the DC potential of its negative pole, switching tube is flyback diode of reverse parallel connection also, the positive pole of this diode connects the negative pole end of switching tube, and the negative pole of diode connects the positive terminal of switching tube.
The present invention adopts the solution of brand-new control circuit, it is characterized by: replenish the energy loss of resonant network when the switching tube conducting, to keep the persistent oscillation of resonant network; In order to reduce the conduction loss of switching tube, adopt no-voltage conducting soft switch technique, the i.e. DC power supply voltage that equals to import in the terminal voltage of resonant capacitance, and by the sense of current moment identical with its terminal voltage direction of resonant inductance, the terminal voltage of switching tube is zero, and switching tube begins conducting, isolating diode is because of positively biased also conducting simultaneously, DC power supply charges into electric current to resonant inductance, is the resonant network makeup energy, keeps uninterrupted vibration; For the sense switch pipe needs moment of conducting, the present invention does not adopt existing scheme, namely detects the terminal voltage of resonant network, and adopts the scheme of voltage to earth of the positive terminal of sense switch pipe, with simplified structure, and improves circuit performance.
The advantage that the present invention has is: only adopting a switching tube can be alternating current with dc inverter just, and the positive terminal voltage to earth of sense switch pipe is as the required feedback voltage detection signal of control circuit, circuit structure is simple, cost is low, and switching tube adopts the soft on ﹠ off operation mode of no-voltage conducting, and loss is very little, the efficient height, life-span is long, the reliability height; The work control of entire circuit finally all concentrates on the control end of switching tube, so regulate and control very convenient; During the switching tube conducting, DC power supply is only to resonant inductance charging, to the resonant capacitance charging, and is to rise gradually by index law by the electric current of inductance, can not suddenly change, so switching tube, circuit and load are not had any impact; Because resonant network is only accepted electric energy from DC power supply in switching tube conduction period, so its oscillation amplitude and power output are directly proportional with the ON time of switching tube, and can accomplish to control with power at the load of different rated power.
Description of drawings
Figure 1 shows that isolating diode is connected on the positive pole of input DC power and the circuit theory diagrams between the LC resonant network;
Figure 2 shows that isolating diode is connected on the embodiment circuit theory diagrams between the positive terminal of LC resonant network and switching tube;
Figure 3 shows that isolating diode is connected on the negative pole end of switching tube and the embodiment circuit theory diagrams between the ground (reference potential);
Figure 4 shows that resonant inductance adopts the circuit theory schematic diagram of transformer form;
Figure 5 shows that the direct voltage of AB terminal voltage, input of LC resonant network and the oscillogram of the electric current by resonant inductance L;
Figure 6 shows that the partial circuit diagram that load is connected with resonant capacitance;
Figure 7 shows that the partial circuit diagram that load is connected with resonant inductance;
Figure 8 shows that the partial circuit diagram that load is in parallel with the LC resonant network;
Figure 9 shows that the partial circuit diagram that load is connected with the transformer secondary of resonant inductance L;
Wherein: VD, isolating diode L, resonant inductance (or being transformer) C, resonant capacitance VT, the switching tube C utmost point, the positive terminal E utmost point of switching tube VT, the negative pole end G utmost point of switching tube VT, the extreme VD0 of control of switching tube VT, flyback diode FZ, load u
AB, the LC resonant network terminal voltage, its reference direction is to point to B point i from the A point in circuit
AB, the electric current by resonant inductance L, its reference direction be from A point sensing B point u
DC, circuit input direct voltage.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Single tube resonant mode soft-switching inversion circuit of the present invention comprises main circuit and control circuit two large divisions generally.
Wherein main circuit comprises resonant network, switching tube VT and the flyback diode VD0 that isolating diode VD, resonant inductance L and resonant capacitance C are connected in parallel and form, and sees that Fig. 1 is to circuit shown in Figure 3.
In circuit shown in Figure 1, isolating diode VD and switching tube VT and resonant network are connected in series, and the positive terminal of isolating diode VD connects the positive pole of the DC power supply of input, its negative pole end connects an end of LC resonant network, it is the A end, the positive terminal C utmost point of switching tube VT connects the other end of LC resonant network, it is the B end, the negative pole end E utmost point ground connection (being reference potential) of switching tube VT, the control end G utmost point of switching tube VT is connected to control circuit, flyback diode VD0 and switching tube VT reverse parallel connection, be that its negative pole end extremely is connected with the C of switching tube VT, its positive terminal extremely is connected with the E of switching tube, and the required feedback sample voltage signal of control circuit is taken from the C utmost point voltage to earth of switching tube VT, this voltage signal input control circuit is by conducting and the shutoff of control circuit control driving switch pipe VT.
Resonant inductance L also can adopt transformer, sees circuit embodiments shown in Figure 4.
Certainly owing to connect, as long as can play good buffer action, isolating diode VD can be connected on the diverse location of circuit, in Fig. 2, isolating diode VD is connected between LC resonant network and the switching tube VT, and in Fig. 3, isolating diode VD is connected between switching tube VT and the ground.With regard to entire circuit, the operation principle of circuit is identical shown in each figure, below be example and the operation principle of specifically introducing circuit of the present invention in conjunction with voltage shown in Figure 5, current waveform figure with circuit shown in Figure 1 just.
In the t1 moment of Fig. 5, switching tube VT is converted to by conducting and ends, and ends because flyback diode VD0 is in anti-state partially, and the current path of the DC power supply of input blocks, and DC power supply finishes the terminal voltage u of resonant capacitance C to the charging of resonant inductance L
ABEqual direct voltage u
DC, the electric current among this moment resonant inductance L is to resonant capacitance C reverse charging (be from B point to point to A point by the electric current in the capacitor C), and resonant capacitance C arrives the t2 moment, resonant capacitance C discharge off, terminal voltage u by resonant inductance L discharge
AB=0, because the electric current in the inductance can not suddenly change, the electric current among the resonant inductance L continues resonant capacitance C reverse charging, and to t3 constantly, the magnetic field energy among the resonant inductance L is released and finished, and discharges and recharges end, the terminal voltage u of LC resonant network
ABReach negative maximum, then resonant capacitance C passes through resonant inductance L back discharge, the voltage maximum that this moment, switching tube VT bore, and its numerical value is the direct voltage u of input
DCAdd the reverse voltage u of resonant capacitance
AB, to t4 moment discharge off, the terminal voltage u of LC resonant network
AB=0, electric current among the resonant inductance L is to point to the A point from the B point at this moment, and because the electric current in the inductance can not suddenly change, the electric current among the resonant inductance L continues resonant capacitance C positive charge (pointing to the B point from the A point by the electric current in the capacitor C), to t5 constantly, the terminal voltage u of LC resonant network
ABBeginning is greater than the direct voltage u of input
DCAlthough flyback diode VD0 is in positively biased, but isolating diode VD is in anti-state partially and ends, so the electric current among the resonant inductance L can not flow to the DC power supply of input and continue the positive charge to resonant capacitance C, to t6 constantly, magnetic field energy among the resonant inductance L is released and is finished, and discharges and recharges end, the terminal voltage u of LC resonant network
ABReach positive maximum, then resonant capacitance C is by the discharge of resonant inductance L forward, the terminal voltage u of LC resonant network
ABBegin to reduce, to t7 constantly, the terminal voltage u of resonant capacitance C
ABThe direct voltage u that equals to import
DC, the sense of current by resonant inductance L is to point to the B point from the A point, this moment, the C utmost point E voltage across poles of switching tube VT was zero, in t7 switching tube VT conducting constantly, the direct voltage of input through isolating diode VD to resonant inductance L charging and to the terminal voltage u of resonant capacitance C
ABDo not have influence, then the electric current by resonant inductance L rises according to index law, and to t8 constantly, switching tube VT ends, and enters t1 operating state constantly, has finished a complete work period.
At t1 to t7 constantly, resonant inductance L and resonant capacitance C are in resonance condition; Flyback diode VD0 only is in the positively biased state constantly at t5 to t7, but because the isolation barrier effect of isolating diode VD, do not have electric current among the flyback diode VD0 and pass through, it only provides a voltage path, and the purpose that flyback diode VD0 is set is in order to eliminate at voltage u
ABU
DCThe time u
ABInfluence to switching tube VT and control circuit; Entire circuit is only accepted the input of electric energy constantly at t7 to t8, definition time difference Δ t=t8-t7, and time difference Δ t is the ON time of switching tube VT just, as the direct voltage u of input
DCOne regularly, circuit is accepted the size that how much only depends on time difference Δ t of outside input electric energy and the stored magnetic field energy of resonance inductance L, just Δ t is more big the time difference, the magnetic field energy that the electric energy that circuit is accepted and resonance inductance L store is more many, the amplitude that the LC resonant network produces and the power of output are more big, in time difference Δ t and loadtype one timing, the amplitude that the LC resonant network produces and the power of output also are certain, and irrelevant with the nominal rating power of load.
From waveform shown in Figure 5 as seen, voltage u
ABA complete cycle T comprise the free oscillation time t=t7-t1 of LC resonant network and the ON time Δ t=t8-t7 of switching tube VT, be T=t+ Δ t, frequency f=1/T=1/ (t+ Δ t), and time t is only relevant with the hardware of circuit, for certain circuit, time, t fixed, so period T and frequency f only depend on the ON time Δ t of switching tube VT, the size of the ON time Δ t by changing switching tube VT just can change the operating frequency of load FZ.
On the basis of the above operation principle, according to different needs, load FZ can select to be mounted on the diverse location of circuit, extremely shown in Figure 9 referring to Fig. 6: load FZ connects with resonant capacitance C, load FZ connects with resonant inductance L, load FZ is in parallel with the LC resonant network, and resonant inductance L is when being transformer, load FZ is connected the secondary of transformer, the connection position difference of load FZ in circuit, on load FZ, will obtain different output waveforms and characteristic, so application of the present invention is quite flexibly.
In addition, the direct voltage u of input
DCNamely can be constant, also can pulse, LC resonant network terminal voltage u
ABComprise u
DCThe envelope of voltage waveform is so adaptability of the present invention is strong.
Theory analysis and experiment showed, that the quality factor q value of LC resonant network is very big to the influence of circuit, the Q value is more big, then voltage u
ABAnd current i
ABWaveform more near sinusoidal waveform, its amplitude is more big, but the crest voltage that while switching tube VT bears can be higher, requirement of withstand voltage to switching tube VT can be higher, circuit cost is more high, particularly hinders for some reason when losing damping suddenly at circuit, will produce very high overvoltage and be applied on the switching tube VT, cause switching tube VT punch through damage, thus will be between circuit performance and cost choose reasonable Q value.
Certainly, under the situation that does not break away from framework of the present invention, other selection and development and equivalent device that we can expect in advance can also be arranged.
Claims (8)
1. single tube resonant mode soft-switching inversion circuit, comprise main circuit and control circuit two parts, main circuit comprises an isolating diode VD, resonant inductance L, resonant capacitance C, switching tube VT and flyback diode VD0, it is characterized in that: control circuit is according to conducting and the shutoff of sampling voltage signal controlling driving switch pipe VT of feedback, being LC resonant tank makeup energy periodically.
2. single tube resonant mode soft-switching inversion circuit according to claim 1, it is characterized in that: resonant inductance L is in parallel with resonant capacitance C, isolating diode VD and switching tube VT connect with the LC shunt circuit, the anodal DC potential of isolating diode and switching tube is higher than the DC potential of its negative pole, flyback diode VD0 and switching tube VT reverse parallel connection, wherein the negative pole of flyback diode VD0 connects the C utmost point of switching tube VT, the positive pole of flyback diode VD0 connects the E utmost point of switching tube VT, the control utmost point G utmost point of switching tube VT connects control circuit, the control excitation of controlled circuit.
3. single tube resonant mode soft-switching inversion circuit according to claim 1, it is characterized in that: resonant inductance L is solenoid inductance or electromagnetic transformers.
4. single tube resonant mode soft-switching inversion circuit according to claim 1, it is characterized in that: the sampling voltage signal of feedback is taken from extreme (reference potential) over the ground voltage of C of switching tube VT.
5. single tube resonant mode soft-switching inversion circuit according to claim 1 is characterized in that: at the terminal voltage u of resonant capacitance C
ABThe direct voltage u that equals to import
DC, and the electric current by resonant inductance L flows to moment of B end from the A end, and switching tube VT begins conducting, and this moment, the c utmost point of switching tube VT was zero with the E voltage across poles, and switching tube VT turn-offed after the conducting regular hour.
6. single tube resonant mode inverter circuit according to claim 5 is characterized in that: the ON time length by by-pass cock pipe VT reaches the adjusting purpose to electric current and voltage amplitude, frequency and the power of load FZ.
7. single tube resonant mode soft-switching inversion circuit according to claim 5, it is characterized in that: at switching tube VT blocking interval, the LC resonant network is in the underdamping resonance condition.
8. single tube resonant mode soft-switching inversion circuit according to claim 1, it is characterized in that: according to different situations, load FZ should select to be connected the secondary of transformer of resonant capacitance C branch road, resonant inductance L branch road or resonant inductance L and in parallel with the LC resonant network respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310231675.2A CN103296911B (en) | 2013-06-12 | 2013-06-12 | Single pipe resonant type soft switch inversion circuit |
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| CN201310231675.2A CN103296911B (en) | 2013-06-12 | 2013-06-12 | Single pipe resonant type soft switch inversion circuit |
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| CN103296911B CN103296911B (en) | 2015-06-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904871A (en) * | 2014-03-25 | 2014-07-02 | 深圳麦格米特电气股份有限公司 | Control method of high-frequency heating power switch tube protection circuit |
| CN104869737A (en) * | 2015-06-02 | 2015-08-26 | 科博达技术有限公司 | Soft-switching DC-DC converting circuit and vehicle-mounted HID (High Intensity Discharge) lamp ballast thereof |
| CN112630540A (en) * | 2019-09-24 | 2021-04-09 | 无锡华润矽科微电子有限公司 | Inductance quality factor measuring method, corresponding measuring circuit and application thereof |
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| CN102055326A (en) * | 2009-10-30 | 2011-05-11 | 西门子公司 | Method for controlling process of turning off soft switch and soft switch |
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| CN102905449A (en) * | 2012-10-29 | 2013-01-30 | 林汉通 | High frequency generator, electrodeless lamp driving method and electrodeless lamp ballast |
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2013
- 2013-06-12 CN CN201310231675.2A patent/CN103296911B/en active Active
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| US5038267A (en) * | 1990-05-03 | 1991-08-06 | General Electric Company | Soft-switching power converter for operation in discrete pulse modulation and pulse width modulation modes |
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| CN102594180A (en) * | 2012-01-21 | 2012-07-18 | 浙江昱能光伏科技集成有限公司 | Control method for switch tube of photovoltaic grid-connected staggered shunt-wound flyback inverter |
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Non-Patent Citations (1)
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| 贺昱曜 等: "串并联谐振软开关IGBT变频器研究", 《西北工业大学学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904871A (en) * | 2014-03-25 | 2014-07-02 | 深圳麦格米特电气股份有限公司 | Control method of high-frequency heating power switch tube protection circuit |
| CN103904871B (en) * | 2014-03-25 | 2016-09-07 | 深圳麦格米特电气股份有限公司 | The control method of high-frequency heating power switching tube protection circuit |
| CN104869737A (en) * | 2015-06-02 | 2015-08-26 | 科博达技术有限公司 | Soft-switching DC-DC converting circuit and vehicle-mounted HID (High Intensity Discharge) lamp ballast thereof |
| CN104869737B (en) * | 2015-06-02 | 2017-05-17 | 科博达技术有限公司 | Soft-switching DC-DC converting circuit and vehicle-mounted HID (High Intensity Discharge) lamp ballast thereof |
| CN112630540A (en) * | 2019-09-24 | 2021-04-09 | 无锡华润矽科微电子有限公司 | Inductance quality factor measuring method, corresponding measuring circuit and application thereof |
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| CN103296911B (en) | 2015-06-03 |
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Inventor after: Fu Yiyong Inventor before: Xiao Guoxuan |
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Effective date of registration: 20170727 Address after: 518128, B, building 501, building B, Silicon Valley, Baoan Avenue, Baoan District, Guangdong, Shenzhen Patentee after: Fu Yiyong Address before: Rushan City Xinping street Weihai city Shandong province 264500 Building 2 Unit No. 503 18-3 Patentee before: Xiao Guoxuan |
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Effective date of registration: 20180507 Address after: 518000 Room 201, building A, No. 1, Qian Wan Road, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (Shenzhen Qianhai business secretary Co., Ltd.) Patentee after: Shenzhen three Pu microelectronics Limited by Share Ltd Address before: 518128 Room 501, B District, B Silicon Valley, Baoan Road West, Baoan District, Shenzhen, Guangdong. Patentee before: Fu Yiyong |