CN204578376U - There is the LLC resonant converter of current-limiting function - Google Patents
There is the LLC resonant converter of current-limiting function Download PDFInfo
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- CN204578376U CN204578376U CN201520231836.2U CN201520231836U CN204578376U CN 204578376 U CN204578376 U CN 204578376U CN 201520231836 U CN201520231836 U CN 201520231836U CN 204578376 U CN204578376 U CN 204578376U
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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
Abstract
The utility model discloses a kind of LLC resonant converter with current-limiting function, comprise inverter circuit, resonant network, transformer, rectifying and wave-filtering network and auxiliary current limliting network, resonant network comprises resonant capacitance, resonant inductance and magnetizing inductance, resonant capacitance, the former limit windings in series of resonant inductance and transformer.Rectifying and wave-filtering network is diode circuit, has the advantage that simple and stable is good.The utility model LLC resonant converter can increase by effective Limited Current when short circuit or overcurrent, thus plays the effect of protective circuit, and this topological structure is simple, and current limitation effect is good, and frequency range is narrow, is applicable to being applied to the aspects such as Switching Power Supply.
Description
Technical field
The utility model belongs to switch power technology field, relates to a kind of switching manipulation power supply, particularly relates to a kind of LLC resonant converter with current-limiting function.
Background technology
Energy conversion efficiency is the focus that people pay close attention to always, a wherein representative changing as power industry efficiency of power conversion apparatus, be widely used in as Switching Power Supply, distributed power source, the various aspects such as uninterrupted power supply, it is large that traditional power conversion apparatus has switching loss, voltage stress is large, and power density is low, and EMI is large, the problems such as conversion efficiency is low, LLC resonant converter then can well weaken or address these problems.
Conventional power converter part works in hard switching state mostly.Namely when switching device is opened, the voltage of switching device is not step transformation, but has a decline process, and the electric current simultaneously flowing through device neither rise to load current immediately, has a uphill process yet.During this period, electric current and voltage have a crossover region, produce turn-on consumption.When the device is switched off, in like manner also loss can be produced.The switching loss of converter is directly proportional to switching frequency, and switching frequency is higher, and total switching loss is larger, and transducer effciency is lower, and therefore, switching loss limits the raising of inverter power density, also limit miniaturization and the lightweight of converter.
LLC resonant converter works in Sofe Switch state, namely former limit switching tube realizes no-voltage and opens (ZVS), secondary rectifying tube realizes zero-current switching (ZCS), thus reduction switching loss, improve transducer effciency, for converter high frequency provides possibility, reduce the volume and weight of converter further, improve power density and the dynamic property of converter, improve electromagnetic compatibility simultaneously.
LLC resonant topology receives publicity more and more, but wherein also there are some practical problems, namely when circuit start, load overcurrent or short circuit when electric current how in limiting circuit in case stop loss bad circuit, only need increase a little power transformer and two diodes.Under normal operation, auxiliary current-limiting circuit is inoperative, and circuit working is under traditional LLC resonant circuit pattern; When overcurrent or short-circuit conditions, resonant capacitance both end voltage raises.When this voltage rise exceedes output voltage to conversion to transformer T2 secondary, two diode alternate conduction, resonant capacitor voltage is by clamper, and resonance current is also by clamper, and now resonant capacitance is equivalent to a voltage source.
Be output voltage source to the voltage source of resonant capacitance clamper, amplitude can not change with input voltage change, and therefore load current limit threshold is relatively little by input voltage variable effect.
Restrictor ring is introduced in control for the switching tube of LLC resonant converter, and when overcurrent, restrictor ring works and output voltage is reduced, thus Limited Current rises further.
Utility model content
The purpose of this utility model is to solve above-mentioned the problems of the prior art, provides a kind of conversion efficiency high, the LLC resonant converter with current-limiting function of energy protective circuit under circuit overcurrent or short-circuit conditions.
To achieve these goals, the utility model is achieved by the following technical solutions:
There is the LLC resonant converter of current-limiting function, comprise DC power supply, DC power supply is connected with inverter circuit, inverter circuit is parallel with the humorous network that shakes, the humorous network that shakes also is parallel with auxiliary current-limiting circuit; Shake the former limit windings in series of humorous network and the first transformer, the vice-side winding of the first transformer connects output rectifier and filter; The former limit winding parallel of the second transformer is shaking on humorous network.
Described inverter circuit is the switching network be made up of full bridge inverter or half-bridge inversion circuit.
Described employing half-bridge inversion circuit, switching tube adopts metal-oxide-semiconductor, doublet diode and parasitic capacitance between the drain electrode of metal-oxide-semiconductor and source electrode.
Described half-bridge inversion circuit comprises the first switch MOS pipe, second switch metal-oxide-semiconductor, the first body diode, the second body diode, the first parasitic capacitance and the second parasitic capacitance;
The drain electrode of the first switch MOS pipe is connected with the positive pole of DC power supply, and the source electrode of second switch metal-oxide-semiconductor is connected with the negative pole of DC power supply, and ground connection; The source electrode of the first switch MOS pipe is connected with the drain electrode of second switch metal-oxide-semiconductor; First body diode and the first parasitic capacitance in parallel are between the source electrode and drain electrode of the first switch MOS pipe, and the anode of the first body diode is connected with the source electrode of the first switch MOS pipe; Second body diode and the second parasitic capacitance in parallel are between the source electrode and drain electrode of second switch metal-oxide-semiconductor, and the anode of the second body diode is connected with the source electrode of second switch metal-oxide-semiconductor; Resonant network is connected in parallel between the source electrode of second switch metal-oxide-semiconductor and drain electrode.
Described resonant network comprises resonant capacitance, the first resonant inductance and the second resonant inductance; Resonant capacitance and the first resonant inductance are connected on one end of the first transformer primary side winding after connecting, the other end and the resonant capacitance of former limit winding are connected in parallel on the output of inverter circuit; Second resonant inductance is connected in parallel on the two ends of the first transformer primary side winding.
The described humorous network that shakes also is parallel with auxiliary current-limiting circuit.
Described current-limiting circuit comprises the second transformer, the first Current Limiting Diodes and the second Current Limiting Diodes; The former limit winding parallel of the second transformer is at resonant capacitance two ends; One end of two vice-side winding of the second transformer is connected with the anode of the first Current Limiting Diodes with the second Current Limiting Diodes respectively, the equal ground connection of the other end; The negative electrode of the first Current Limiting Diodes and the second Current Limiting Diodes is all connected on the cathode output end of output rectifier and filter.
Described output rectifier and filter comprises the first rectifier diode, the second rectifier diode, filter capacitor and the output loading as output; One end of two vice-side winding of the first transformer is connected with the anode of the first rectifier diode with the second rectifier diode respectively, and the other end is all connected on the cathode output end of output loading; The negative electrode of the first rectifier diode and the second rectifier diode is all connected on the cathode output end of output loading; Filter capacitor is connected in parallel on the two ends of output loading.
Compared with prior art, the utility model has following beneficial effect:
The utility model in normal operation, auxiliary circuit is inoperative, circuit working is identical with traditional LLC resonant circuit, and when overcurrent or short-circuit conditions occur, the voltage at resonant capacitance two ends raises, when this voltage rise to conversion after transformer T2 secondary voltage time, and exceeding output voltage, diode D3 and D4 alternate conduction, resonant capacitor voltage is by clamper, thus resonance current is also by clamper, now resonant capacitance equivalence becomes a voltage source.The utility model is by being together in parallel resonant circuit and current-limiting protection circuit, and be beneficial to realize the high application of transformation efficiency, under circuit overcurrent or short-circuit conditions, Limited Current is excessive, regulated output voltage, plays the effect of protective circuit.
Further, the voltage source of the topology that the utility model proposes to resonant capacitance clamper is output voltage source, and its amplitude can not change with the change of input voltage, and therefore load current limit threshold is less by input voltage variable effect; When short-circuit conditions occurs, this topological structure shows its intrinsic current limiting characteristic, particularly when in control method in conjunction with conversion method time; This topological structure can effectively prevent circuit components from damaging.So this kind of topological structure is particularly suitable for the application scenario of high output voltage, as electric operation power etc.
Accompanying drawing explanation
Fig. 1 is the utility model controlled resonant converter circuit topological structure;
Fig. 2 be the utility model circuit when normally working at f
r1< f < f
r2oscillogram;
Fig. 3 is that the utility model adds the circuit theory diagrams that restrictor ring controls;
Fig. 4 is the oscillogram of the utility model when being short-circuited.
Embodiment
Be further described in detail of the present utility model below in conjunction with accompanying drawing.
See Fig. 1; the utility model comprises a LLC resonant transform circuit, and LLC resonant transform circuit comprises switching circuit, LLC resonant tank, transformer, output rectifier and filter, is secondly auxiliary current-limiting protection circuit; this circuit is connected on resonant capacitance two ends, carries out clamper to resonant capacitor voltage.
Particular circuit configurations comprises DC power supply Vin, first switch MOS pipe Q1, the body diode D1 of the first switch MOS pipe Q1, parasitic capacitance C1, second switch metal-oxide-semiconductor Q2, the body diode D2 of second switch metal-oxide-semiconductor Q2, parasitic capacitance C2, resonant capacitance Cr, first resonant inductance Lr, second resonant inductance Lm, first transformer T1, first rectifier diode D3, second rectifier diode D4, second transformer T2, 3rd Current Limiting Diodes D5, 4th Current Limiting Diodes D6, filter capacitor Co and output resistance Ro,
The drain electrode of the first switch MOS pipe Q1 is connected with DC power supply with the source electrode of second switch metal-oxide-semiconductor Q2, and the source electrode of the first switch MOS pipe Q1 is connected with the drain electrode of second switch metal-oxide-semiconductor Q2, the source ground of second switch metal-oxide-semiconductor Q2; First transformer T1 former limit winding and resonant capacitance Cr connect, first resonant inductance of connecting is the leakage inductance of transformer primary side, second resonant inductance in parallel is the magnetizing inductance of transformer, first transformer T1 vice-side winding meets the first rectifier diode D3 and the second rectifier diode D4 respectively, vice-side winding parallel filtering electric capacity Co and output loading Ro;
Second transformer T2 former limit winding is connected on resonant capacitance Cr two ends, and the second transformer T2 vice-side winding meets the 3rd Current Limiting Diodes D5 and the 4th Current Limiting Diodes D6, and the 3rd Current Limiting Diodes D5 is connected with filter capacitor Co with the 4th Current Limiting Diodes D6.
The utility model LLC resonant transform circuit comprises DC power supply, and the direct-flow input end of LLC resonant tank connects the output of DC power supply; LLC resonant tank is half-bridge resonance structure.Transformer, LLC resonant tank filters circuit by transformer coupled with output rectification.Output rectifier and filter is full-wave rectification.LLC resonant tank comprises square wave circuit for generating and LLC resonant circuit, and the direct-flow input end of square wave circuit for generating is the direct-flow input end of LLC resonant tank; The output of the input termination square wave circuit for generating of LLC resonant circuit, exports termination transformer primary side winding.LLC resonant circuit comprises series resonant capacitance, series resonance inductor and parallel resonant inductor, series resonant capacitance, series resonance inductor connect with parallel resonant inductor after two ends connect two outputs, parallel resonant inductor and the transformer primary side winding parallel of square wave circuit for generating respectively.Series resonance inductor is the leakage inductance of transformer primary side, and parallel resonant inductor is the magnetizing inductance of transformer.Series resonant capacitance two ends also connect current-limiting protection circuit, and protective circuit is made up of little power transformer and diode, and protective circuit output and resonance circuit output end connect.
The utility model principle and the course of work:
As shown in Figure 2, the circuit waveform figure of the utility model when normal work, LLC resonant converter has two operating frequencies
LLC resonant converter not only can be operated in f > f
r1and f=f
r1frequency range in, but also can f be operated in
r1< f < f
r2frequency range within, when converter is operated within the scope of this, former limit switching tube realizes ZVS, secondary limit rectifier diode realizes ZCS, there is not reverse-recovery problems, turn-off power loss is little, well realizes Sofe Switch, thus in LLC resonant converter of the present utility model normal work wave just in this frequency range.The cycle that of controlled resonant converter is complete is made up of different subintervals and corresponding different mode.
[t
0-t
2] stage, the first switch MOS pipe Q1 conducting, resonance current i
lrincrease, i
lrbe greater than i
lm, the first rectifier diode D3 conducting, transformer is output voltage clamping, and converter starts to secondary transferring energy, and because the first switch MOS pipe Q1 realizes ZVS, turn-off power loss is little, and the energy being transferred to secondary side will increase.
[t
2-t
3] stage, i
lrequal i
lm, L
mstart to participate in resonance, the resonant cavity of resonant element composition is started working, and transformer is output isolation, and the first rectifier diode D3 turns off, and former secondary does not carry out the transmission of energy.
[t
3-t
4] stage, the first switch MOS pipe Q1 and second switch metal-oxide-semiconductor Q2 turns off, and in Dead Time, the parasitic capacitance C1 charging of the first switch MOS pipe Q1, the parasitic capacitance C2 electric discharge of second switch metal-oxide-semiconductor Q2, makes second switch metal-oxide-semiconductor Q2 to realize ZVS.
As shown in Figure 3, the utility model LLC resonant converter adopts restrictor ring to control, and the basis of Fig. 1 adds the first sample circuit, the second sample circuit, the 3rd sample circuit, control processor, drive circuit; First sample circuit carries out sampling feedback to control processor to input voltage, second sample circuit carries out sampling feedback to control processor to the first transformer T1 former limit winding current, and the 3rd sample circuit carries out sampling feedback to control processor end to output voltage; Control processor (single-chip microcomputer, DSP, FPGA) processes the signal feeding back to oneself, adopts PWM control methods to regulate duty ratio to drive square wave circuit for generating to the first switching tube Q1 and second switch pipe Q2 signal.
LLC resonant converter has the two ore control of auxiliary current-limiting protection circuit and restrictor ring to protect; when circuit malfunctions; auxiliary current-limiting protection circuit carries out clamper to resonant capacitor voltage; prevent electric current continue rise, meanwhile, the second sample circuit in time by the current feedback on former for T1 limit to processor; processor makes a response rapidly; regulate the square-wave signal that drive circuit produces, metal-oxide-semiconductor can cut-off in time, plays the effect of protective circuit.
As shown in Figure 4; work as circuit malfunctions; namely, when circuit overcurrent or short circuit, auxiliary protection circuit participation work, plays the effect of protective circuit; circuit before and after fault is contrasted; known after fault occurs, auxiliary protection circuit and restrictor ring control all to play a role, and multi-resonant capacitance voltage carries out clamper; resonance current is suppressed to increase, protective circuit.
Above content is only and technological thought of the present utility model is described; protection range of the present utility model can not be limited with this; every technological thought according to the utility model proposes, any change that technical scheme basis is done, within the protection range all falling into the utility model claims.
Claims (7)
1. there is the LLC resonant converter of current-limiting function, it is characterized in that: comprise DC power supply (Vin), DC power supply (Vin) is connected with inverter circuit, inverter circuit is parallel with the humorous network that shakes, the humorous network that shakes also is parallel with auxiliary current-limiting circuit; Shake the former limit windings in series of humorous network and the first transformer (T1), the vice-side winding of the first transformer (T1) connects output rectifier and filter; The former limit winding parallel of the second transformer (T2) is shaking on humorous network.
2. the LLC resonant converter with current-limiting function according to claim 1, is characterized in that: described inverter circuit is the switching network be made up of full bridge inverter or half-bridge inversion circuit.
3. the LLC resonant converter with current-limiting function according to claim 1, is characterized in that: described inverter circuit adopts half-bridge inversion circuit, and switching tube adopts metal-oxide-semiconductor, doublet diode and parasitic capacitance between the drain electrode of metal-oxide-semiconductor and source electrode.
4. the LLC resonant converter with current-limiting function according to claim 3, is characterized in that: described half-bridge inversion circuit comprises the first switch MOS pipe (Q1), second switch metal-oxide-semiconductor (Q2), the first body diode (D1), the second body diode (D2), the first parasitic capacitance (C1) and the second parasitic capacitance (C2);
The drain electrode of the first switch MOS pipe (Q1) is connected with the positive pole of DC power supply, and the source electrode of second switch metal-oxide-semiconductor (Q2) is connected with the negative pole of DC power supply, and ground connection; The source electrode of the first switch MOS pipe (Q1) is connected with the drain electrode of second switch metal-oxide-semiconductor (Q2); First body diode (D1) and the first parasitic capacitance (C1) are connected in parallel between the source electrode of the first switch MOS pipe (Q1) and drain electrode, and the anode of the first body diode (D1) is connected with the source electrode of the first switch MOS pipe (Q1); Second body diode (D2) and the second parasitic capacitance (C2) are connected in parallel between the source electrode of second switch metal-oxide-semiconductor (Q2) and drain electrode, and the anode of the second body diode (D2) is connected with the source electrode of second switch metal-oxide-semiconductor (Q2); Resonant network is connected in parallel between the source electrode of second switch metal-oxide-semiconductor (Q2) and drain electrode.
5. the LLC resonant converter with current-limiting function according to claim 1 or 4, is characterized in that: described resonant network comprises resonant capacitance (Cr), the first resonant inductance (Lr) and the second resonant inductance (Lm); Resonant capacitance (Cr) and the first resonant inductance (Lr) are connected on one end of the first transformer (T1) former limit winding after connecting, the other end and the resonant capacitance (Cr) of former limit winding are connected in parallel on the output of inverter circuit; Second resonant inductance (Lm) is connected in parallel on the two ends of the first transformer (T1) former limit winding.
6. the LLC resonant converter with current-limiting function according to claim 1, is characterized in that: described current-limiting circuit comprises the second transformer (T2), the first Current Limiting Diodes (D5) and the second Current Limiting Diodes (D6); The former limit winding parallel of the second transformer (T2) is at resonant capacitance (Cr) two ends; One end of two vice-side winding of the second transformer (T2) is connected with the anode of the first Current Limiting Diodes (D5) with the second Current Limiting Diodes (D6) respectively, the equal ground connection of the other end; The negative electrode of the first Current Limiting Diodes (D5) and the second Current Limiting Diodes (D6) is all connected on the cathode output end of output rectifier and filter.
7. the LLC resonant converter with current-limiting function according to claim 1, is characterized in that: described output rectifier and filter comprises the first rectifier diode (D3), the second rectifier diode (D4), filter capacitor (Co) and the output loading (Ro) as output; One end of two vice-side winding of the first transformer (T1) is connected with the anode of the first rectifier diode (D3) with the second rectifier diode (D4) respectively, and the other end is all connected on the cathode output end of output loading (Ro); The negative electrode of the first rectifier diode (D3) and the second rectifier diode (D4) is all connected on the cathode output end of output loading (Ro); Filter capacitor (Co) is connected in parallel on the two ends of output loading (Ro).
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| CN201520231836.2U CN204578376U (en) | 2015-04-16 | 2015-04-16 | There is the LLC resonant converter of current-limiting function |
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| CN201520231836.2U CN204578376U (en) | 2015-04-16 | 2015-04-16 | There is the LLC resonant converter of current-limiting function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106787756A (en) * | 2016-12-29 | 2017-05-31 | 天津大学 | A kind of CL FT CL resonance DC converters |
| CN107124104A (en) * | 2016-02-25 | 2017-09-01 | 株式会社村田制作所 | DC/DC conversion equipments |
| CN107863888A (en) * | 2017-07-20 | 2018-03-30 | 西安华羿微电子股份有限公司 | Half-bridge LC resonant transform circuits based on PWM controls |
| CN112713793A (en) * | 2020-12-16 | 2021-04-27 | 上海希形科技有限公司 | Power circuit of electromagnetic descaling device |
| CN112803780A (en) * | 2021-02-10 | 2021-05-14 | 华为技术有限公司 | Converter and power adapter |
| TWI745981B (en) * | 2020-05-26 | 2021-11-11 | 宏碁股份有限公司 | Self-driving power supply based on resonance energy recycling |
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2015
- 2015-04-16 CN CN201520231836.2U patent/CN204578376U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107124104A (en) * | 2016-02-25 | 2017-09-01 | 株式会社村田制作所 | DC/DC conversion equipments |
| CN107124104B (en) * | 2016-02-25 | 2020-04-21 | 株式会社村田制作所 | DC/DC converter |
| CN106787756A (en) * | 2016-12-29 | 2017-05-31 | 天津大学 | A kind of CL FT CL resonance DC converters |
| CN106787756B (en) * | 2016-12-29 | 2019-06-28 | 天津大学 | A kind of CL-FT-CL resonance DC converter |
| CN107863888A (en) * | 2017-07-20 | 2018-03-30 | 西安华羿微电子股份有限公司 | Half-bridge LC resonant transform circuits based on PWM controls |
| CN107863888B (en) * | 2017-07-20 | 2024-01-16 | 华羿微电子股份有限公司 | Half-bridge LC resonance conversion circuit based on PWM control |
| TWI745981B (en) * | 2020-05-26 | 2021-11-11 | 宏碁股份有限公司 | Self-driving power supply based on resonance energy recycling |
| CN112713793A (en) * | 2020-12-16 | 2021-04-27 | 上海希形科技有限公司 | Power circuit of electromagnetic descaling device |
| CN112803780A (en) * | 2021-02-10 | 2021-05-14 | 华为技术有限公司 | Converter and power adapter |
| US11843318B2 (en) | 2021-02-10 | 2023-12-12 | Huawei Digital Power Technologies Co., Ltd. | Converter and power adapter for reducing energy loss |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20160416 |
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| CF01 | Termination of patent right due to non-payment of annual fee |