CN106451364A - Over-current protection circuit for full-bridge LLC resonance converter - Google Patents
Over-current protection circuit for full-bridge LLC resonance converter Download PDFInfo
- Publication number
- CN106451364A CN106451364A CN201610493977.0A CN201610493977A CN106451364A CN 106451364 A CN106451364 A CN 106451364A CN 201610493977 A CN201610493977 A CN 201610493977A CN 106451364 A CN106451364 A CN 106451364A
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- China
- Prior art keywords
- full
- transformator
- bridge
- switching tube
- switch pipe
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the invention provides an over-current protection circuit for a full-bridge LLC resonance converter. The circuit comprises an input source (Uin), a L6599A chip, a full-bridge converter (10), a transformer (T1), a resonant capacitor (Cr), a transformer (T2) and a rectifying circuit (20); and the transformer (T2) and the rectifying circuit (20) are configured to detect the resonance current, and are connected with the 6 legs of the L6599A chip so as to solve the problem that the full-bridge circuit and the L6599A chip cannot realize current protection.
Description
Technical field
The present invention relates to LLC resonance circuit, specifically one kind is for full-bridge LLC resonant converter current foldback circuit.
Background technology
Widely use the threshold currents protection circuit controlling 6 feet of L6599 chip to make LLC half bridge resonant transformer at present.But
It is, when in full-bridge LLC resonant converter, because the ground of L6599 chip can not connect with brachium pontis midpoint so can not directly rectification
Circuit is followed by 6 feet of L6599 chip.For the current protection of full-bridge LLC resonant converter, electricity is used as using transformator (T2)
Flow sensor, transformator (T2) magnetizing inductance can also as resonant inductance a part, take full advantage of the effect of leakage inductance.Core
6 feet of piece L6599 are current detecting foot.If the voltage of 6 foot detection signals reaches 0.8V, limit the transmission of energy, make master
The peak point current in loop is almost a steady state value.But when voltage reaches 1.5V, L6599 will shut down, resonance circuit no longer work
Make.
Content of the invention
For the current protection of full-bridge LLC resonant converter, current sense is used as using transformator (T2)
Device, transformator (T2) magnetizing inductance can also as resonant inductance a part, take full advantage of the effect of leakage inductance.
The present invention is with the extremely convenient overcurrent protection achieving and utilizing L6599 chip in full-bridge LLC resonance circuit, and complicated utilization
Resonant inductance.
Brief description
Fig. 1 is LLC circuit structure diagram of the present invention.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples：As shown in fig. 1, described input source (Uin)；
L6599A chip, full-bridge bridging parallel operation (10), transformator (T1), resonant capacitance (Cr), transformator (T2), rectification circuit (20)；Institute
State full-bridge circuit and include first switch pipe (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), institute
State rectification circuit and include the first stabilivolt (ZD1), the second stabilivolt (ZD2), diode (D1), electric capacity (C1), resistance (R1)；Described
Input source (Uin) negative pole is connected to ground, input source (Uin) positive pole and full-bridge converter (10) switching tube S1、S4Drain electrode connect, entirely
(10) brachium pontis midpoints of bridging parallel operation are connected with resonant capacitance (Cr) one end, the primary one end of described transformator (T1) and resonance
Electric capacity (Cr) other end connects, and transformator (T1) other end is connected with transformator (T2) primary non-same polarity, described full-bridge conversion
Another brachium pontis midpoint of device (10) and transformator (T2) primary Same Name of Ends is connected, and transformator (T2) is secondary and rectification circuit (20)
End connects, and rectification circuit (20) other end is connected with 6 feet of chip L6599；First switch pipe (S1) drain electrode, the 4th switching tube
(S4) drain electrode connect, first switch pipe (S1) source electrode and second switch pipe (S2) drain electrode connection, the 4th switching tube (S4) source electrode with
3rd switching tube (S3) drain electrode connection, second switch pipe (S2), the 3rd switching tube (S3) source electrode is connected to ground；First stabilivolt
(ZD1) negative electrode and the second stabilivolt (ZD2) negative electrode connection, the first stabilivolt (ZD1) negative electrode and diode (D1) negative electrode connection, two
Pole pipe (D1) anode one end and electric capacity (C1) one end, resistance (R1) one end connection, electric capacity (C1) other end, resistance (R1) other end,
Second stabilivolt (ZD2) anode is connected to ground；The resonant inductance of resonance circuit has transformator (T1) leakage inductance and transformator (T2) encourage
Magnetoelectricity sense is constituted；
Current signal is through transformator (T2) isolation again through rectification circuit (10) be converted to required voltage signal connect 6
Foot, the voltage of detection signal reaches 0.8V, then limit the transmission of energy, makes the peak point current almost of major loop constant
Value.But when voltage reaches 1.5V, L6599 quits work, and resonance circuit quits work, implement current protection.
Claims (5)
1. one kind is used for full-bridge LLC resonant converter current foldback circuit, and its feature includes：Input source (Uin)；L6599A core
Piece, full-bridge bridging parallel operation (10), transformator (T1), resonant capacitance (Cr), transformator (T2), rectification circuit (20)；Described full-bridge electricity
Road includes first switch pipe (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), described rectification circuit
Including the first stabilivolt (ZD1), the second stabilivolt (ZD2), diode (D1), electric capacity (C1), resistance (R1).
2. one kind is used for full-bridge LLC resonant converter current foldback circuit, and its feature includes：Described input source (Uin) negative pole with ground
Connect, input source (Uin) positive pole and full-bridge converter (10) switching tube S1、S4Drain electrode connect, (10) bridges of full-bridge converter
Arm midpoint is connected with resonant capacitance (Cr) one end, and the primary one end of described transformator (T1) is with resonant capacitance (Cr) other end even
Connect, transformator (T1) other end is connected with transformator (T2) primary non-same polarity, described another brachium pontis of full-bridge converter (10)
Midpoint is connected with transformator (T2) primary Same Name of Ends, and transformator (T2) secondary is connected with rectification circuit (20) one end, rectification circuit
(20) other end is connected with 6 feet of chip L6599.
3. full-bridge converter (10) structure according to claim 1, is characterized in that：First switch pipe (S1) drain electrode, the 4th
Switching tube (S4) drain electrode connect, first switch pipe (S1) source electrode and second switch pipe (S2) drain electrode connection, the 4th switching tube (S4)
Source electrode and the 3rd switching tube (S3) drain electrode connection, second switch pipe (S2), the 3rd switching tube (S3) source electrode is connected to ground.
4. rectification circuit (20) structure according to claim 1, is characterized in that：First stabilivolt (ZD1) negative electrode is steady with second
Pressure pipe (ZD2) negative electrode connection, the first stabilivolt (ZD1) negative electrode and diode (D1) negative electrode connection, diode (D1) anode one end with
Electric capacity (C1) one end, resistance (R1) one end connection, electric capacity (C1) other end, resistance (R1) other end, the second stabilivolt (ZD2) anode
It is connected to ground.
5. it is used for full-bridge LLC resonant converter overcurrent protection its feature of electricity according to claim 1 to include：Resonance circuit humorous
The inductance that shakes has transformator (T1) leakage inductance and transformator (T2) magnetizing inductance composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610493977.0A CN106451364A (en) | 2016-06-29 | 2016-06-29 | Over-current protection circuit for full-bridge LLC resonance converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610493977.0A CN106451364A (en) | 2016-06-29 | 2016-06-29 | Over-current protection circuit for full-bridge LLC resonance converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106451364A true CN106451364A (en) | 2017-02-22 |
Family
ID=58183275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610493977.0A Pending CN106451364A (en) | 2016-06-29 | 2016-06-29 | Over-current protection circuit for full-bridge LLC resonance converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106451364A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047337A (en) * | 2007-04-12 | 2007-10-03 | 艾默生网络能源有限公司 | Three-level LLC resonance inverter |
| CN103326323A (en) * | 2013-06-26 | 2013-09-25 | 深圳奥特迅电力设备股份有限公司 | Switching power supply protective circuit and method |
| KR101330414B1 (en) * | 2012-07-23 | 2013-11-15 | 엘에스산전 주식회사 | Asymmetric switching driving method for llc converter |
| CN103986332A (en) * | 2014-05-07 | 2014-08-13 | 许继电气股份有限公司 | LLC resonant converter |
| CN204858973U (en) * | 2015-07-16 | 2015-12-09 | 协成科技股份有限公司 | Isolation feedback supply circuit of LLC resonant transformation ware |
-
2016
- 2016-06-29 CN CN201610493977.0A patent/CN106451364A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047337A (en) * | 2007-04-12 | 2007-10-03 | 艾默生网络能源有限公司 | Three-level LLC resonance inverter |
| KR101330414B1 (en) * | 2012-07-23 | 2013-11-15 | 엘에스산전 주식회사 | Asymmetric switching driving method for llc converter |
| CN103326323A (en) * | 2013-06-26 | 2013-09-25 | 深圳奥特迅电力设备股份有限公司 | Switching power supply protective circuit and method |
| CN103986332A (en) * | 2014-05-07 | 2014-08-13 | 许继电气股份有限公司 | LLC resonant converter |
| CN204858973U (en) * | 2015-07-16 | 2015-12-09 | 协成科技股份有限公司 | Isolation feedback supply circuit of LLC resonant transformation ware |
Non-Patent Citations (1)
| Title |
|---|
| 熊吉: "基于L6599的LLC半桥多谐振变换器的研制", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20170222 |
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