CN101931316A - LLC (Liquid Level Control) topology and current limiting circuit thereof - Google Patents
LLC (Liquid Level Control) topology and current limiting circuit thereof Download PDFInfo
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- CN101931316A CN101931316A CN 200910151604 CN200910151604A CN101931316A CN 101931316 A CN101931316 A CN 101931316A CN 200910151604 CN200910151604 CN 200910151604 CN 200910151604 A CN200910151604 A CN 200910151604A CN 101931316 A CN101931316 A CN 101931316A
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Abstract
The invention discloses a current limiting circuit of an LLC (Liquid Level Control) topology, wherein the LLC topology comprises a resonant capacitor, the current limiting circuit comprises a clamping circuit coupled to both ends of the resonant capacitor, and the output end of the clamping circuit is coupled to the input side of the LLC topology. The LLC topology comprises the current limiting circuit. The current limiting circuit realizes that batteries are boosted by utilizing the LLC topology and preferably suitable for industrial occasions with inverters at the back stages; and because the output end of the clamping circuit is transferred to the input side from the output side of the LLC topology, the current limiting circuit can solve the problems of overlarge current limiting point change and short overload maintaining time existing in the traditional current limiting scheme, thereby ensuring that a system ensures a relatively stable overcurrent protecting point.
Description
Technical field
The present invention relates to Switching Power Supply, particularly relate to a kind of current-limiting circuit of LLC topology and have the LLC topology of this current-limiting circuit.
Background technology
The realization of LLC topology current-limiting function, the industry universal scheme has following several:
Scheme one, by the sampling resonance current, utilize the quick response of current loop, carry out the modulation of switching frequency.
The condition that enables that the size of scheme two, resonance current drives as switching tube when size of current surpasses certain limit value, is blocked driving, decontrols driving when electric current returns to normal range (NR) again.
More than two kinds of schemes can realize circuit is protected, but have following problem:
1. scheme one is improper for numerically controlled LLC topology, main cause be the response speed of loop to break period of control chip having proposed higher requirement, particularly in the occasion of software systems more complicated, be unfavorable for that the low cost of whole system realizes.
2. scheme two adopts the mode of wave limiting that system power is monitored, thereby upset resonant process on the one hand and greatly reduced the ability that system's band transships, on the other hand, envelope ripple behavior meeting under the big electric current makes a big impact for switching tube piezoelectric voltage stress, and the switch tube voltage stress under the limiting condition tends to exceed standard.
At the problem that occurs with the upper flow scheme, for numerically controlled LLC system, industry has proposed to realize current limliting by transformer clamping resonant capacitance voltage method.Be that example is analyzed being achieved as follows of current-limiting function now with full-bridge LLC topology.See also Fig. 1, switching tube Q1, Q2, Q3, Q4, resonant inductance Lr, resonant capacitance Cr, transformer T1 constitute typical full-bridge LLC topology, the two ends of the former edge joint resonant capacitance of transformer T2 Cr, and secondary is received outlet side by a half-wave rectifying circuit.This circuit is not worked under the normal condition; When diode D1, the D2 conducting during greater than n*Vin of the voltage Vcr on the resonant capacitance Cr, capacitance voltage Vcr is clamped to the current potential identical with n*Vin (n is the no-load voltage ratio of transformer T2), thereby reaches the purpose of restriction resonance current.That this current limliting scheme has is simple in structure, cost is low, the overload operating mode does not have advantages such as influence to the LLC resonance condition.
Also there is following problem in actual applications in this scheme at present:
1) in the process of load variations because the fluctuation of output voltage V o can cause the variation of current-limiting points, be unfavorable for the realization of fixed current protection point.The current protection scope of wide region can make the current protection under the different operating modes be difficult to balance.
2) continue under the situation of heavy duty, particularly under the situation of output short-circuit, higher requirement is compared in the current stress proposition of device T2, D1 in the current-limiting circuit, D2.Cause the current limliting design of this kind scheme to become difficult to achieve.
Owing to above reason, though this scheme proposes very early, specifically the application in industrial products is all substituted by other scheme.
Summary of the invention
Main purpose of the present invention is exactly at the deficiencies in the prior art; a kind of current-limiting circuit and the LLC topology with described current-limiting circuit of LLC topology are provided; solve current-limiting points and change the short problem of holding time excessive and overload, make system guarantee a metastable over-current protection point.
For achieving the above object, the present invention is by the following technical solutions:
A kind of current-limiting circuit of LLC topology, described LLC topology comprises resonant capacitance, and described current-limiting circuit comprises the clamp circuit that is coupled to described resonant capacitance two ends, it is characterized in that, and the output of described clamp circuit is coupled to the input side of described LLC topology.
Preferably, described clamp circuit comprises transformer and rectification circuit, the two ends of the described resonant capacitance of former edge joint of described transformer, and the secondary of described transformer connects the input side of described LLC topology by described rectification circuit.
More preferably, described LLC topology is a battery booster type topology, and the secondary of described transformer connects the two ends of battery by described half-wave rectifying circuit.Further, the topology that described LLC topology is boosted for battery and back grade adds inverter
A kind of LLC topology comprises aforesaid a kind of current-limiting circuit.
Described LLC topology can be half-bridge, full-bridge or asymmetrical half-bridge topology.
Described LLC topology comprises output rectification circuit, and it can adopt halfwave rectifier, full-wave rectification or full-bridge rectification.
Beneficial technical effects of the present invention is:
According to current-limiting circuit of the present invention, the output that will be used for the clamp circuit of clamp resonant capacitance voltage is received input side, for the LLC topology based on the battery booster type, the output of clamp circuit is connected battery port, and it has following remarkable advantage with respect to traditional scheme:
1) output of clamp circuit is transferred to input side from the outlet side of LLC topology, the moving scope of the band carrier wave of input side cell voltage is much smaller than the moving scope of bus band carrier wave, the problem of having avoided the current-limiting points of clamp current limliting scheme to be difficult to determine;
2) near the stable characteristics of the voltage of battery rated point are for system provides a metastable voltage benchmark.
The invention solves the traditional scheme current-limiting points and change the short problem of holding time excessive and overload; make system guarantee a metastable over-current protection point; simultaneously; the mode of the voltage by the clamp resonant capacitance realizes current limliting, has the advantage of the transducer that does not need to be specifically designed to current detecting.
Description of drawings
Fig. 1 is the circuit theory diagrams that traditional full-bridge LLC topology is passed through transformer clamping resonant capacitance voltage;
Fig. 2 is the circuit theory diagrams of an embodiment of the present invention;
Fig. 3-5 shows several distortion of LLC topology of the present invention:
Level adds half-bridge inverter Fig. 3 adds inverter circuit for asymmetrical half-bridge LLC boosts after;
Fig. 4 for clamp current-limiting circuit output adopt full-bridge rectification after level add half-bridge inverter;
Fig. 5 for clamp current-limiting circuit output adopt halfwave rectifier after level add full-bridge inverter.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Embodiment
Please refer to Fig. 2, the circuit shown in it is that the LLC topology is in battery booster type Application for Field example.If adopt the scheme of traditional transformer clamper current limliting, 2 application problems mentioning in the background technology will become outstanding unusually because of the fluctuation of outlet side busbar voltage.The present invention transfers to input side with the output of clamp circuit from the outlet side of LLC topology, can solve this two problems.
As shown in Figure 2, in one embodiment, the current-limiting circuit of LLC topology comprises the clamp circuit of being made up of transformer T2, rectifier diode D1, D2, and the former limit of transformer T2 connects resonant capacitance Cr two ends, and the input of the output termination LLC topology after the rectification is the two ends BAT+ and the BAT-of battery.When system power surpasses limit value, diode D1, D2 conducting, the voltage on the resonant capacitance Cr is by the cell voltage clamper, thus the realization current-limiting function.With respect to traditional scheme, in the present embodiment output of this clamp circuit is transferred to battery side from bus bar side, because cell voltage will be stablized manyly with respect to the busbar voltage of LLC outlet side, thereby can make system guarantee a metastable over-current protection point.
Further, the industrial occasions that adds inverter for level after the LLC topology, when outlet side impact overload or output short-circuit, bus capacitor C1, C2 can reduce the rush of current of load to resonant cavity as buffer stage, in addition by in back level inverter circuit, adding the current stress requirement that current limiting measures can further reduce LLC lateral confinement current circuit, thereby make the design of LLC current limliting become simple and practical.
Current-limiting circuit of the present invention is applicable to different LLC topologys, comprises half-bridge, full-bridge, asymmetrical half-bridge etc.Simultaneously, the present invention also is applicable to different output rectifier systems, comprises halfwave rectifier, full-wave rectification, full-bridge rectification etc.Please refer to Fig. 3-5, LLC topology according to the present invention includes but not limited to adopt distortion circuit as shown in the figure.Wherein, Fig. 3 has showed that asymmetrical half-bridge LLC boosts and has added that level adds half-bridge inverter behind the inverter circuit; Level added half-bridge inverter after Fig. 4 had showed clamp current-limiting circuit output employing full-bridge rectification; Fig. 5 has showed clamp current-limiting circuit output employing halfwave rectifier, and level adds full-bridge inverter after the LLC topology.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. the current-limiting circuit of a LLC topology, described LLC topology comprises resonant capacitance, and described current-limiting circuit comprises the clamp circuit that is coupled to described resonant capacitance two ends, it is characterized in that, and the output of described clamp circuit is coupled to the input side of described LLC topology.
2. the current-limiting circuit of LLC topology as claimed in claim 1, it is characterized in that, described clamp circuit comprises transformer and rectification circuit, the two ends of the described resonant capacitance of former edge joint of described transformer, and the secondary of described transformer connects the input side of described LLC topology by described rectification circuit.
3. as the current-limiting circuit of LLC topology as described in the claim 2, it is characterized in that described LLC topology is the battery topology of boosting, the secondary of described transformer connects the two ends of battery by described rectification circuit.
4. as the current-limiting circuit of LLC topology as described in the claim 3, it is characterized in that described LLC topology adds the topology of inverter for the back level.
5. a LLC topology is characterized in that, comprises each described current-limiting circuit according to claim 1-4.
6. LLC topology as claimed in claim 5 is characterized in that, described LLC topology is half-bridge, full-bridge or asymmetrical half-bridge topology.
7. LLC topology as claimed in claim 5 is characterized in that, described LLC topology comprises the output rectification circuit that adopts halfwave rectifier, full-wave rectification or full-bridge rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200910151604 CN101931316B (en) | 2009-06-22 | 2009-06-22 | LLC (Liquid Level Control) topology and current limiting circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910151604 CN101931316B (en) | 2009-06-22 | 2009-06-22 | LLC (Liquid Level Control) topology and current limiting circuit thereof |
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| CN101931316A true CN101931316A (en) | 2010-12-29 |
| CN101931316B CN101931316B (en) | 2013-03-06 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412752A (en) * | 2011-12-08 | 2012-04-11 | 南通三九焊接机器制造有限公司 | Full-bridge resonant soft switching device |
| CN103117642A (en) * | 2012-05-25 | 2013-05-22 | 深圳市中兴昆腾有限公司 | Control system and method of liquid level control (LLC) resonant converter |
| CN103138590A (en) * | 2011-12-02 | 2013-06-05 | 中兴通讯股份有限公司 | Current-limiting protection method and device of resonance circuit |
| CN103219705A (en) * | 2013-03-12 | 2013-07-24 | 中兴通讯股份有限公司 | Method and device for short circuit protection of half-bridge resonant converter |
| CN103825463A (en) * | 2013-11-30 | 2014-05-28 | 许继集团有限公司 | Llc circuit |
| CN104377960B (en) * | 2013-08-15 | 2018-04-20 | 南京博兰得电子科技有限公司 | Controlled resonant converter and its control method |
| CN116388545A (en) * | 2023-06-05 | 2023-07-04 | 深圳市泰昂能源科技股份有限公司 | LLC topology current limiting circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1028274C (en) * | 1992-09-25 | 1995-04-19 | 松下电工株式会社 | Power supply |
| CN101047337A (en) * | 2007-04-12 | 2007-10-03 | 艾默生网络能源有限公司 | Three-level LLC resonance inverter |
-
2009
- 2009-06-22 CN CN 200910151604 patent/CN101931316B/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138590A (en) * | 2011-12-02 | 2013-06-05 | 中兴通讯股份有限公司 | Current-limiting protection method and device of resonance circuit |
| CN103138590B (en) * | 2011-12-02 | 2017-02-08 | 中兴通讯股份有限公司 | Current-limiting protection method and device of resonance circuit |
| CN102412752A (en) * | 2011-12-08 | 2012-04-11 | 南通三九焊接机器制造有限公司 | Full-bridge resonant soft switching device |
| CN102412752B (en) * | 2011-12-08 | 2013-03-27 | 南通三九焊接机器制造有限公司 | Full-bridge resonant soft switching device |
| CN103117642A (en) * | 2012-05-25 | 2013-05-22 | 深圳市中兴昆腾有限公司 | Control system and method of liquid level control (LLC) resonant converter |
| WO2014139414A1 (en) * | 2013-03-12 | 2014-09-18 | 中兴通讯股份有限公司 | Short-circuit protection method and device for a half-bridge resonant converter |
| CN103219705B (en) * | 2013-03-12 | 2016-02-24 | 中兴通讯股份有限公司 | The short-circuit protection method of half bridge resonant transformer and device |
| CN103219705A (en) * | 2013-03-12 | 2013-07-24 | 中兴通讯股份有限公司 | Method and device for short circuit protection of half-bridge resonant converter |
| US9812857B2 (en) | 2013-03-12 | 2017-11-07 | Xi'an Zhongxing New Software Co. Ltd. | Short-circuit protection method and device for a half-bridge resonant converter |
| CN104377960B (en) * | 2013-08-15 | 2018-04-20 | 南京博兰得电子科技有限公司 | Controlled resonant converter and its control method |
| CN103825463A (en) * | 2013-11-30 | 2014-05-28 | 许继集团有限公司 | Llc circuit |
| CN116388545A (en) * | 2023-06-05 | 2023-07-04 | 深圳市泰昂能源科技股份有限公司 | LLC topology current limiting circuit |
| CN116388545B (en) * | 2023-06-05 | 2023-08-22 | 深圳市泰昂能源科技股份有限公司 | LLC topology current limiting circuit |
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| CN101931316B (en) | 2013-03-06 |
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Address after: Columbo Road, Ohio, Dearborn 1050 Patentee after: Vitamin Corporation Address before: Columbo Road, Ohio, Dearborn 1050 Patentee before: Libot Inc. |