CN203788152U - LLC resonant converter - Google Patents
LLC resonant converter Download PDFInfo
- Publication number
- CN203788152U CN203788152U CN201420145681.6U CN201420145681U CN203788152U CN 203788152 U CN203788152 U CN 203788152U CN 201420145681 U CN201420145681 U CN 201420145681U CN 203788152 U CN203788152 U CN 203788152U
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- Prior art keywords
- resonant
- circuit
- capacitance
- absorption
- transformer
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 45
- 238000004804 winding Methods 0.000 claims abstract description 26
- 239000004065 semiconductor Substances 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Classifications
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Dc-Dc Converters (AREA)
Abstract
The utility model discloses an LLC resonant converter, comprising an inverter circuit, a resonant network, a transformer, a primary side absorption circuit, and an output rectifying circuit. The resonant network is connected with the output end of the inverter circuit. The resonant network comprises a resonant capacitor, a resonant inductor, and a primary winding of the transformer. The resonant capacitor, the resonant inductor, and the primary winding of the transformer are connected in series. The primary side absorption circuit is connected with the resonant inductor in parallel. The primary side absorption circuit comprises an absorption resistor and an absorption capacitor. The absorption resistor and the absorption capacitor are connected in series. The LLC resonant converter can improve waveforms of an output rectifier tube, reduces ringing, and reduces EMI interference source amplitude.
Description
[technical field]
The utility model relates to Switching Power Supply, relates in particular to a kind of LLC controlled resonant converter.
[background technology]
The circuit of traditional LLC controlled resonant converter as shown in Figure 1, comprises bridge inverter main circuit, resonant network, transformer T1 and output rectification circuit.Inverter circuit is asymmetrical half-bridge inverter circuit, comprises switching tube Q1 and Q2; Resonant network comprises the former limit winding of resonant capacitance Cr, resonant inductance Lr and transformer T1, the former limit windings in series of resonant capacitance Cr, resonant inductance Lr and transformer T1; Output rectification circuit is that transformer secondary winding has centre tapped full-wave rectifying circuit, comprises two rectification metal-oxide-semiconductor Q3 and Q4.Resistance R 2, R3, capacitor C 2, C3 form RC absorbing circuit, to absorb the ring that between metal-oxide-semiconductor Q3, Q4 drain electrode and source electrode, voltage waveform produces, this ring is formed when it is blocked by junction capacitance between the leakage inductance of resonant inductance Lr and transformer T1 and rectification metal-oxide-semiconductor Q3 or Q4 source electrode and drain electrode.But, only there is the RC absorbing circuit of resistance R 2, R3, capacitor C 2, C3, still exist assimilation effect undesirable, absorb the thermal losses producing and concentrate on resistance R 2, the defect on R3.
[summary of the invention]
The technical problems to be solved in the utility model is to provide a kind of waveform that can improve output rectifying tube, reduces ring, reduces the LLC controlled resonant converter of EMI interference source amplitude.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of LLC controlled resonant converter, comprise inverter circuit, resonant network, transformer, former limit absorbing circuit and output rectification circuit, resonant network connects the output of inverter circuit, resonant network comprises the former limit winding of resonant capacitance, resonant inductance and transformer, the former limit windings in series of resonant capacitance, resonant inductance and transformer; Former limit absorbing circuit is in parallel with resonant inductance; Former limit absorbing circuit comprises absorption resistance and Absorption Capacitance, and absorption resistance is connected with Absorption Capacitance.
Above-described LLC controlled resonant converter, inverter circuit is full bridge inverter or half-bridge inversion circuit.
Above-described LLC controlled resonant converter, inverter circuit is half-bridge inversion circuit, resonant capacitance comprises the first resonant capacitance and the second resonant capacitance; The mid point of the first termination half-bridge inversion circuit of resonant inductance, the first end of the second termination transformer primary side winding of resonant inductance, the second end of transformer primary side winding connects respectively the first end of the first resonant capacitance and the first end of the second resonant capacitance; The second end of the first resonant capacitance and the second end of the second resonant capacitance connect respectively the two ends of half-bridge inversion circuit.
Above-described LLC controlled resonant converter, comprises two secondary absorbing circuits, and secondary absorbing circuit comprises the second absorption resistance and the second Absorption Capacitance, and the second absorption resistance is received capacitances in series with suction second; Output rectification circuit is full-wave rectifying circuit, comprises two rectifying tubes.
Above-described LLC controlled resonant converter, two secondary absorbing circuits are with a rectifying tube is in parallel respectively.
Above-described LLC controlled resonant converter, one end of two secondary absorbing circuits connects respectively the two ends of secondary winding, the centre cap of another termination secondary winding.
Above-described LLC controlled resonant converter, rectifying tube is diode or metal-oxide-semiconductor.
The utility model LLC controlled resonant converter can improve the waveform of output rectifying tube, reduces ring, reduces EMI interference source amplitude.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the circuit diagram of prior art asymmetrical half-bridge LLC controlled resonant converter.
Fig. 2 is the circuit diagram of the utility model embodiment 1 asymmetrical half-bridge LLC controlled resonant converter.
Fig. 3 is the circuit diagram of the utility model embodiment 2 asymmetrical half-bridge LLC controlled resonant converters.
Fig. 4 is the circuit diagram of the utility model embodiment 3 asymmetrical half-bridge LLC controlled resonant converters.
Fig. 5 is the circuit diagram of the utility model embodiment 4 asymmetrical half-bridge LLC controlled resonant converters.
Fig. 6 is the circuit diagram of the utility model embodiment 5 asymmetrical half-bridge LLC controlled resonant converters.
Fig. 7 is the circuit diagram of the utility model embodiment 6 full-bridge LLC controlled resonant converters.
Fig. 8 is the circuit diagram of the utility model embodiment 7 full-bridge LLC controlled resonant converters.
[embodiment]
The circuit of the utility model embodiment 1 asymmetrical half-bridge LLC controlled resonant converter as shown in Figure 2, comprises inverter circuit, resonant network, transformer T1 and output rectification circuit.Inverter circuit is asymmetrical half-bridge inverter circuit, comprises switching tube Q1 and Q2; Resonant network comprises the former limit winding of resonant capacitance Cr, resonant inductance Lr and transformer T1, the former limit windings in series of resonant capacitance Cr, resonant inductance Lr and transformer T1.Resonant network connects the output of asymmetrical half-bridge inverter circuit.
Former limit absorbing circuit comprises absorption resistance R1 and Absorption Capacitance C1, and absorption resistance R1 connects with Absorption Capacitance C1.Former limit absorbing circuit is in parallel with resonant inductance.
Output rectification circuit be centered by transformer T1 secondary winding with the full-wave rectifier filter circuit of tap, comprise two rectifying tubes, rectifying tube is metal-oxide-semiconductor Q3 and Q4; Two secondary absorbing circuits comprise respectively absorption resistance R2, Absorption Capacitance C2, and absorption resistance R3, Absorption Capacitance C3.The absorbing circuit forming after absorption resistance R2 connects with Absorption Capacitance C2 is in parallel with metal-oxide-semiconductor Q3; The absorbing circuit forming after absorption resistance R3 connects with Absorption Capacitance C3 is in parallel with metal-oxide-semiconductor Q4.
The circuit of the utility model embodiment 2 asymmetrical half-bridge LLC controlled resonant converters as shown in Figure 3, as different from Example 1, has only adopted former limit absorbing circuit, does not adopt secondary absorbing circuit.
As shown in Figure 4, as different from Example 1, rectifying tube is diode D1 and D2 to the circuit of the utility model embodiment 3 asymmetrical half-bridge LLC controlled resonant converters; Two secondary absorbing circuits comprise respectively absorption resistance R2, Absorption Capacitance C2 equally, and absorption resistance R3, Absorption Capacitance C3.The absorbing circuit forming after absorption resistance R2 connects with Absorption Capacitance C2 is in parallel with diode D1; The absorbing circuit forming after absorption resistance R3 connects with Absorption Capacitance C3 is in parallel with diode D2.
The circuit of the utility model embodiment 4 asymmetrical half-bridge LLC controlled resonant converters as shown in Figure 5, as different from Example 1, the first end of one termination secondary winding of the absorbing circuit forming after absorption resistance R2 connects with Absorption Capacitance C2, the centre cap of another termination secondary winding.The second end of one termination secondary winding of the absorbing circuit forming after absorption resistance R3 connects with Absorption Capacitance C3, the centre cap of another termination secondary winding.
As shown in Figure 6, as different from Example 1, resonant capacitance comprises resonant capacitance Cr and resonance capacitor C rA to the circuit of the utility model embodiment 5 symmetrical half bridge LLC controlled resonant converters; The mid point of the first termination half-bridge inversion circuit of resonant inductance Lr, the first end of the second former limit of termination transformer T1 winding of resonant inductance Lr, the second end of the former limit of transformer T1 winding connects respectively the first end of resonant capacitance Cr and the first end of resonance capacitor C rA; The second end of the second end of resonant capacitance Cr and resonance capacitor C rA connects respectively first end and second end of half-bridge inversion circuit.
As shown in Figure 7, as different from Example 1, bridge inverter main circuit adopts full bridge inverter to the circuit of the utility model embodiment 6 full-bridge LLC controlled resonant converters, and resonant network connects the output of full bridge inverter.
As shown in Figure 8, as different from Example 4, bridge inverter main circuit adopts full bridge inverter to the circuit of the utility model embodiment 7 full-bridge LLC controlled resonant converters, and resonant network connects the output of full bridge inverter.
The LLC controlled resonant converter of the above embodiment of the utility model, increases RC absorbing circuit, to obtain better assimilation effect at resonant inductance Lr two ends.Its major advantage is: 1) further improve the waveform of output rectifying tube, reduce ring, reduce EMI interference source amplitude.2) can use separately R1, C1, also can with R2, C2, R3, C3 is used together and obtains better assimilation effect, is convenient to arrange flexibly the thermal losses of absorbing circuit.3) output rectification circuit metal-oxide-semiconductor Q3, the voltage waveform between the source-drain electrode of Q4 improves, and only occurs a lot of spike of having decayed, and follow-up ring can be suppressed completely.
Claims (7)
1. a LLC controlled resonant converter, comprise inverter circuit, resonant network, transformer and output rectification circuit, resonant network connects the output of inverter circuit, resonant network comprises the former limit winding of resonant capacitance, resonant inductance and transformer, the former limit windings in series of resonant capacitance, resonant inductance and transformer, it is characterized in that, comprise former limit absorbing circuit, former limit absorbing circuit is in parallel with resonant inductance; Former limit absorbing circuit comprises absorption resistance and Absorption Capacitance, and absorption resistance is connected with Absorption Capacitance.
2. LLC controlled resonant converter according to claim 1, is characterized in that, inverter circuit is full bridge inverter or half-bridge inversion circuit.
3. LLC controlled resonant converter according to claim 1, is characterized in that, inverter circuit is half-bridge inversion circuit, and resonant capacitance comprises the first resonant capacitance and the second resonant capacitance; The mid point of the first termination half-bridge inversion circuit of resonant inductance, the first end of the second termination transformer primary side winding of resonant inductance, the second end of transformer primary side winding connects respectively the first end of the first resonant capacitance and the first end of the second resonant capacitance; The second end of the first resonant capacitance and the second end of the second resonant capacitance connect respectively the two ends of half-bridge inversion circuit.
4. LLC controlled resonant converter according to claim 1, is characterized in that, comprises two secondary absorbing circuits, and secondary absorbing circuit comprises the second absorption resistance and the second Absorption Capacitance, and the second absorption resistance is received capacitances in series with suction second; Output rectification circuit is full-wave rectifying circuit, comprises two rectifying tubes.
5. LLC controlled resonant converter according to claim 4, is characterized in that, two secondary absorbing circuits are with a rectifying tube is in parallel respectively.
6. LLC controlled resonant converter according to claim 4, is characterized in that, one end of two secondary absorbing circuits connects respectively the two ends of secondary winding, the centre cap of another termination secondary winding.
7. LLC controlled resonant converter according to claim 1, is characterized in that, rectifying tube is diode or metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420145681.6U CN203788152U (en) | 2014-03-28 | 2014-03-28 | LLC resonant converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420145681.6U CN203788152U (en) | 2014-03-28 | 2014-03-28 | LLC resonant converter |
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| Publication Number | Publication Date |
|---|---|
| CN203788152U true CN203788152U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420145681.6U Expired - Fee Related CN203788152U (en) | 2014-03-28 | 2014-03-28 | LLC resonant converter |
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| CN (1) | CN203788152U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206636A (en) * | 2016-12-19 | 2018-06-26 | 美国亚德诺半导体公司 | The DC-DC converter of isolation |
| CN111030459A (en) * | 2019-11-18 | 2020-04-17 | 合肥华耀电子工业有限公司 | Low-ripple high-voltage power supply and design method thereof |
| CN112994501A (en) * | 2021-04-29 | 2021-06-18 | 合肥工业大学 | Circuit model of high-frequency link DC/AC converter with buffer branch |
| CN113765385A (en) * | 2021-09-28 | 2021-12-07 | 浪潮商用机器有限公司 | Converter and converter EMI buffer circuit capacitor design method |
-
2014
- 2014-03-28 CN CN201420145681.6U patent/CN203788152U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206636A (en) * | 2016-12-19 | 2018-06-26 | 美国亚德诺半导体公司 | The DC-DC converter of isolation |
| CN111030459A (en) * | 2019-11-18 | 2020-04-17 | 合肥华耀电子工业有限公司 | Low-ripple high-voltage power supply and design method thereof |
| CN111030459B (en) * | 2019-11-18 | 2023-07-18 | 合肥华耀电子工业有限公司 | Design method of low-ripple high-voltage power supply |
| CN112994501A (en) * | 2021-04-29 | 2021-06-18 | 合肥工业大学 | Circuit model of high-frequency link DC/AC converter with buffer branch |
| CN113765385A (en) * | 2021-09-28 | 2021-12-07 | 浪潮商用机器有限公司 | Converter and converter EMI buffer circuit capacitor design method |
| CN113765385B (en) * | 2021-09-28 | 2023-12-01 | 浪潮商用机器有限公司 | Converter and design method of converter EMI buffer circuit capacitor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160527 Address after: 412000 No. 1728, Taishan Road, Tianyuan District, Hunan, Zhuzhou Patentee after: ZHUZHOU MEGMEET ELECTRIC CO.,LTD. Address before: 518000 Shenzhen science and technology zone, Nanshan District Province, North District, road, No. 13, Thunis science and Technology Park, layer 5 Patentee before: SHENZHEN MEGMEET ELECTRICAL Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 |
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| CF01 | Termination of patent right due to non-payment of annual fee |