CN104600994A - Primary side control circuit for isolation conversion circuit - Google Patents
Primary side control circuit for isolation conversion circuit Download PDFInfo
- Publication number
- CN104600994A CN104600994A CN201410854129.9A CN201410854129A CN104600994A CN 104600994 A CN104600994 A CN 104600994A CN 201410854129 A CN201410854129 A CN 201410854129A CN 104600994 A CN104600994 A CN 104600994A
- Authority
- CN
- China
- Prior art keywords
- circuit
- former limit
- winding
- control circuit
- sampling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
The invention discloses a primary side control circuit for an isolation conversion circuit. The isolation conversion circuit does not need to assist windings to provide a feedback signal, a feedback circuit of the primary side control circuit is coupled on a primary side winding of a transformer, a control circuit of the primary side control circuit is based on the feedback signal and a current signal flowing through a main switch to provide a switch signal so as to control the main switch to be on or off, and accordingly the output of the isolation conversion circuit is controlled. The primary side control circuit based isolation conversion circuit and a method thereof do not need to assist the windings, the control on an output end is implemented through primary side feedback, and accordingly a peripheral circuit is simplified.
Description
Technical field
The present invention relates to a kind of DC isolated variable device, particularly a kind of isolated variable circuit using former limit control technology.
Background technology
The most obvious feature of off-line type power supply is containing isolating transformer, and isolating transformer makes the input and output of off-line type power supply isolate, and the output therefore if desired controlling off-line type power supply just needs a kind of feedback signal can crossing over isolating transformer.Being fed back by optocoupler, is a kind of feedback system of conventional leap isolating transformer.The current mode feedback of optocoupler, makes it have the advantages such as precision is high, feedback speed is fast, but opto-coupled feedback also exists problems such as temperature influence is large, the optocoupler life-span itself is short, poor anti jamming capability.Former limit feedback is another kind of feedback system, and have employed magnetic feedback technique, please refer to Fig. 1, be a kind of former limit feedback control scheme, off-line type power supply anti exciting converter, comprises an isolating transformer T, and anti exciting converter isolation is divided into former limit and secondary.Current sampling circuit uses sampling resistor Rs1 to connect with the former limit winding Np of transformer T, and sensing flows through the current value IFB of former limit winding Np, and the turn ratio relation indirect according to transformer primary side and secondary current senses the current value flowing through vice-side winding Ns.Former limit control circuit is by sensing secondary voltage with isolating transformer T-phase winding Naux even.The secondary voltage sensed is formed feedback voltage V FB through a bleeder circuit by former limit control circuit, uses for former limit control circuit 22.Adopt the advantage of former limit FEEDBACK CONTROL to be omitted optocoupler, but it still need an auxiliary winding indirectly to sense the voltage of vice-side winding.
Summary of the invention
Technical problem to be solved by this invention, is for the defect in aforementioned background art and deficiency, provides a kind of circuit, this circuit is without the need to auxiliary winding, at the output voltage of transformer primary side feedback isolation translation circuit, realize the control to output, thus peripheral circuit is simplified the structure.The present invention is for solving above technical problem, and the technical scheme adopted is:
For a former limit control circuit for isolated variable circuit, comprising:
Isolating transformer, described isolating transformer comprises former limit winding and vice-side winding, and described former limit winding receives input signal;
Switch, couples with described former limit winding;
Current sampling circuit, the electric current of sampling in the winding of described former limit;
Voltage sampling circuit, the input voltage of described former limit winding of sampling
Control unit, accepts the output signal of described current sampling circuit and described voltage sampling circuit, for described switch provides switching signal, in order to control conducting and the disconnection of described switch
According to embodiments of the invention, described current sampling circuit is a sampling resistor, described sampling resistor and described former limit windings in series.
According to embodiments of the invention, described voltage sampling circuit is a bleeder circuit be made up of two resistant series, described bleeder circuit and described former limit winding parallel.
According to embodiments of the invention, described control unit is a RS logical-arithmetic unit.
Accompanying drawing explanation
Fig. 1 is the former limit control circuit in a known technology.
Fig. 2 is the circuit diagram of a specific embodiment of the present invention.
Embodiment
Specific embodiments of the invention will be described in detail below.It should be noted that the embodiments described herein is only for illustrating, is not limited to the present invention.Describe and the consideration of easy-to-read based on specification, define the isolated variable circuit occurred in patent application document of the present invention, described isolated variable circuit refers to the converter of use isolating transformer.It should be noted that, above-mentioned term, only as denotion one of its title meant, therefore allly means the title identical or approximate with it and all should be considered as its equivalent.
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
As Fig. 2, it is a specific embodiment of the present invention.Isolated converter is an anti exciting converter, comprises an isolating transformer T, and anti exciting converter isolation is divided into former limit and secondary.Current sampling circuit uses sampling resistor Rs1 to connect with the former limit winding Np of transformer T, and sensing flows through the current value IFB of former limit winding Np, and the current value sensed is supplied to the R end of a RS logical-arithmetic unit.Former limit control circuit is by the input voltage of voltage sampling circuit sensing isolating transformer.Described voltage sampling circuit is that a use resistance R1 and resistance R2 carries out bleeder circuit in series, one end of the circuit of described dividing potential drop is connected with the input positive pole of described isolating transformer, the other end of described bleeder circuit is connected with the ground of described isolating transformer, the former limit polygonal voltage sensed is supplied to the S end of a RS logical-arithmetic unit by former limit control circuit, and after described RS logical-arithmetic unit carries out logical operation, its Q holds as switch Q provides drive singal.
It should be noted that; the embodiment enumerated herein is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention; any change that technical scheme basis is done, all falls within scope.
Claims (4)
1., for a former limit control circuit for isolated variable circuit, comprising:
Isolating transformer, described isolating transformer comprises former limit winding and vice-side winding, and described former limit winding receives input signal;
Switch, couples with described former limit winding;
Current sampling circuit, the electric current of sampling in the winding of described former limit;
Voltage sampling circuit, the input voltage of described former limit winding of sampling
Control unit, accepts the output signal of described current sampling circuit and described voltage sampling circuit, for described switch provides switching signal, in order to control conducting and the disconnection of described switch.
2. a kind of former limit control circuit for isolated variable circuit as claimed in claim 1, is characterized in that described current sampling circuit is a sampling resistor, described sampling resistor and described former limit windings in series.
3. a kind of former limit control circuit for isolated variable circuit as claimed in claim 1, is characterized in that described voltage sampling circuit is a bleeder circuit be made up of two resistant series, described bleeder circuit and described former limit winding parallel.
4. a kind of former limit control circuit for isolated variable circuit as claimed in claim 1, is characterized in that described control unit is a RS logical-arithmetic unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410854129.9A CN104600994A (en) | 2014-12-24 | 2014-12-24 | Primary side control circuit for isolation conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410854129.9A CN104600994A (en) | 2014-12-24 | 2014-12-24 | Primary side control circuit for isolation conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104600994A true CN104600994A (en) | 2015-05-06 |
Family
ID=53126578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410854129.9A Pending CN104600994A (en) | 2014-12-24 | 2014-12-24 | Primary side control circuit for isolation conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104600994A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787746A (en) * | 2015-11-24 | 2017-05-31 | 宁波鑫泰电气科技有限公司 | Vehicle charger for electric vehicle circuit |
| CN107104585A (en) * | 2016-02-19 | 2017-08-29 | 比亚迪股份有限公司 | Control device, control method and the switch power supply system of Switching Power Supply |
-
2014
- 2014-12-24 CN CN201410854129.9A patent/CN104600994A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787746A (en) * | 2015-11-24 | 2017-05-31 | 宁波鑫泰电气科技有限公司 | Vehicle charger for electric vehicle circuit |
| CN106787746B (en) * | 2015-11-24 | 2019-09-10 | 宁波鑫泰电气科技有限公司 | Vehicle charger for electric vehicle circuit |
| CN107104585A (en) * | 2016-02-19 | 2017-08-29 | 比亚迪股份有限公司 | Control device, control method and the switch power supply system of Switching Power Supply |
| CN107104585B (en) * | 2016-02-19 | 2019-11-05 | 比亚迪股份有限公司 | Control device, control method and the switch power supply system of Switching Power Supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Gao Xinyong Document name: Notification of before Expiration of Request of Examination as to Substance |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Gao Xinyong Document name: Notification that Application Deemed to be Withdrawn |
|
| DD01 | Delivery of document by public notice | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150506 |
|
| WD01 | Invention patent application deemed withdrawn after publication |