CN101197539A - Electric power circuit - Google Patents
Electric power circuit Download PDFInfo
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- CN101197539A CN101197539A CNA2006101574511A CN200610157451A CN101197539A CN 101197539 A CN101197539 A CN 101197539A CN A2006101574511 A CNA2006101574511 A CN A2006101574511A CN 200610157451 A CN200610157451 A CN 200610157451A CN 101197539 A CN101197539 A CN 101197539A
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- current rectifying
- frequency transformer
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Abstract
The invention provides a power circuit, which comprises a first rectifying wave filtering circuit, an isolating high-frequency transformer, a second rectifying wave filtering circuit, a transistor, a feedback circuit, a pulse width adjusting controller and a compensation circuit, wherein, one end of the primary winding of the isolating high-frequency transformer is in electric connection with the output terminal of the first rectifying wave filtering circuit while the other terminal is in electric connection with the resource pole of the transistor; the secondary winding of the isolating high-frequency transformer is in electric connection with the two input terminals of the second rectifying wave circuit; one end of an auxiliary winding is in electric connection with the voltage sampling terminal of the pulse width adjusting controller through the compensation circuit while the other end is grounded. The grating pole of the transistor is in electric connection with the controlling end of the pulse width adjusting controller while the leakage pole is in electric connection with the voltage sampling end of the feedback circuit, the leakage pole is grounded simultaneously.
Description
Technical field
The present invention relates to a kind of power circuit.
Background technology
See also Fig. 1, it is a kind of electrical block diagram of prior art power circuit.This power circuit 10 comprises one first current rectifying and wave filtering circuit 11, a protective circuit 13, an isolation high frequency transformer 14, one second current rectifying and wave filtering circuit 15, a transistor 17, a feedback circuit 18 and a PWM controller 19.Wherein, this first current rectifying and wave filtering circuit 11 comprises two inputs 111,112, a full bridge rectifier 113, a filter capacitor 114 and an output 115, this isolation high frequency transformer 14 comprises an elementary winding 141 and a level winding 142, this second current rectifying and wave filtering circuit 15 comprises two inputs 151,152 and an output 150, and this PWM controller 19 comprises a control end 191 and a voltage sample end 192.
Two inputs of this full bridge rectifier 113 i.e. two inputs 111,112 of this first current rectifying and wave filtering circuit, the positive output end of this full bridge rectifier 113 i.e. the output 115 of this first current rectifying and wave filtering circuit, the negative output terminal ground connection of this full bridge rectifier 113, this filter capacitor 114 is connected in parallel between the positive output end and negative output terminal of this full bridge rectifier 113.This protective circuit 13 is in parallel with this elementary winding 141 of isolating high frequency transformer 14.These elementary winding 141 1 ends of isolating high frequency transformer 14 are electrically connected with the output 115 of this first current rectifying and wave filtering circuit 11, and its other end is electrically connected with the source electrode of this transistor 17.This secondary winding 142 of isolating high frequency transformer 14 is electrically connected with two inputs 151,152 of this second current rectifying and wave filtering circuit 15.The grid of this transistor 17 is electrically connected with the control end of this PWM controller 19, the drain electrode of this transistor 17 is electrically connected with the voltage sample end 192 of this PWM controller 19 by this feedback circuit 18, and the drain electrode of this transistor 17 is simultaneously by a current-limiting resistance 170 ground connection.
Extraneous alternating voltage inputs to two inputs 111,112 of this first current rectifying and wave filtering circuit 11, by being output as direct voltage after these first current rectifying and wave filtering circuit, 11 rectifications, the filtering.When these transistor 17 conductings, this filter capacitor 114, this elementary winding 141, this transistor 17 and this current-limiting resistance 170 of isolating high frequency transformer 14 constitute a loop, and at this moment, these filter capacitor 114 equivalences are a direct current power supply, these elementary winding 141 equivalences are an inductance, by formula:
Linear the increasing of electric current in (V represents the voltage of filter capacitor 114, and L represents the inductance of elementary winding 141, I represent to flow through the electric current of this elementary winding 141) elementary as can be known winding 141 reaches maximum at last.This feedback circuit 18 is with the Voltage Feedback of this current-limiting resistance 170 voltage sample end 192 to this PWM controller 19, this PWM controller 19 compares this feedback voltage and its reference voltage, when feedback voltage was higher than its reference voltage, control end 191 output low levels of this PWM controller 19 quit work to control this transistor 17.
When this transistor 17 ended, the electric energy transmitting that this elementary winding 141 stores was to this secondary winding 142, and the output galvanic current is pressed after these second current rectifying and wave filtering circuit, 15 rectifications, filtering.The exciting current of this elementary winding 141 consumes by this protective circuit 13.
So, when input 111,112 AC power that connected not simultaneously, the mistake flow point of its output 150 changes greatly.For example, when AC power was 100V, recording flow point at output 150 was 2.61A, and when AC power was 240V, recording flow point at output 150 was 3.70A.When the voltage of input 111,112 AC power that connected was very high, the electric current in the circuit was also corresponding bigger, if when input side or outlet side break down, this power circuit 10 just may be burnt.
Summary of the invention
In order to solve the mistake flow point variation problem greatly of power circuit output end in the prior art, the invention provides a kind of mistake flow point stable power circuit that makes output.
A kind of power circuit, it comprises one first current rectifying and wave filtering circuit, an isolation high frequency transformer, one second current rectifying and wave filtering circuit, a transistor, a feedback circuit, a PWM controller and a compensating circuit.Wherein, this first current rectifying and wave filtering circuit comprises two inputs and an output, this isolation high frequency transformer comprises an elementary winding, level winding and an auxiliary winding, this second current rectifying and wave filtering circuit comprises two inputs and an output, and this PWM controller comprises a control end and a voltage sample end.This elementary winding one end of isolating high frequency transformer is electrically connected with the output of this first current rectifying and wave filtering circuit, and its other end is electrically connected with this transistorized source electrode; This secondary winding of isolating high frequency transformer is electrically connected with two inputs of this second current rectifying and wave filtering circuit; This auxiliary winding one end of isolating high frequency transformer is electrically connected its other end ground connection by this compensating circuit with the voltage sample end of this PWM controller.This transistorized grid is electrically connected with the control end of this PWM controller; This transistor drain is electrically connected with the voltage sample end of this PWM controller by this feedback circuit, and this transistor drain is ground connection simultaneously.
Compared with prior art, power circuit of the present invention increases by a compensating circuit and feeds back with the voltage to input side, when AC power that input connected changes, this compensating circuit will assist the induced voltage of winding to feed back to the voltage sample end of this PWM controller, the feedback voltage of this feedback voltage and this feedback circuit is superimposed, this PWM controller should total feedback voltage and its reference voltage compare and send control signal corresponding controlling this transistor, thereby make the mistake flow point of this power circuit output end stable.
Description of drawings
Fig. 1 is a kind of electrical block diagram of prior art power circuit.
Fig. 2 is the electrical block diagram of power circuit of the present invention.
Embodiment
See also Fig. 2, it is the electrical block diagram of power circuit of the present invention.This power circuit 20 comprises one first current rectifying and wave filtering circuit 21, a protective circuit 23, an isolation high frequency transformer 24, one second current rectifying and wave filtering circuit 25, a transistor 27, a feedback circuit 28, a PWM controller 29 and a compensating circuit 31; wherein, this first current rectifying and wave filtering circuit 21 comprises two inputs 211,212, a full bridge rectifier 213, a filter capacitor 214 and an output 215.This isolation high frequency transformer 24 comprises an elementary winding 241, a level winding 242 and an auxiliary winding 30.This second current rectifying and wave filtering circuit 25 comprises two inputs 251,252 and an output 250.This PWM controller 29 comprises a control end 291 and a voltage sample end 292.This compensating circuit 31 comprises an input 310, an output 315, a diode 313, one first resistance 311 and one second resistance 312.
Two inputs of this full bridge rectifier 213 are as two inputs 211,212 of this first current rectifying and wave filtering circuit 21, the positive output end of this full bridge rectifier 213 is as the output 215 of this first current rectifying and wave filtering circuit 21, the negative output terminal ground connection of this full bridge rectifier 21, this filter capacitor 214 is connected in parallel between the positive output end and negative output terminal of this full bridge rectifier 213.This protective circuit 23 is in parallel with this elementary winding 241 of isolating high frequency transformer 24.These elementary winding 241 1 ends of isolating high frequency transformer 24 are electrically connected with the output 215 of this first current rectifying and wave filtering circuit 21, and its other end is electrically connected with the source electrode of this transistor 27.This secondary winding 242 of isolating high frequency transformer 24 is electrically connected with two inputs 251,252 of this second current rectifying and wave filtering circuit 25.The grid of this transistor 27 is electrically connected with the control end 291 of this PWM controller 29, the drain electrode of this transistor 27 is electrically connected with the voltage sample end 292 of this PWM controller 29 by this feedback circuit 28, and the drain electrode of this transistor 27 is simultaneously by a current-limiting resistance 270 ground connection.These auxiliary winding 30 1 ends of isolating high frequency transformer 24 are electrically connected its other end ground connection with the input 310 of this compensating circuit 31.This diode 313 and this first resistance 311 are serially connected between the input 310 and output 315 of this compensating circuit 31, and the negative pole of this diode 313 is connected with this first resistance 311, the output 315 of this compensating circuit 31 is electrically connected with the voltage sample end 292 of this PWM controller 29, and it is simultaneously by these second resistance, 312 ground connection.
Extraneous alternating voltage inputs to two inputs 211,212 of this first current rectifying and wave filtering circuit 21, by being output as direct voltage after these first current rectifying and wave filtering circuit, 21 rectifications, the filtering.When these transistor 27 conductings, this filter capacitor 214, this elementary winding 241, this transistor 27 and this current-limiting resistance 270 of isolating high frequency transformer 24 constitute a loop, and at this moment, these filter capacitor 214 equivalences are a direct current power supply, these elementary winding 241 equivalences are an inductance, by formula:
Linear the increasing of electric current in (V represents the voltage of filter capacitor 214, and L represents the inductance of elementary winding 241, I represent to flow through the electric current of this elementary winding 241) elementary as can be known winding 241 reaches maximum at last.This feedback circuit 28 is with the Voltage Feedback of this current-limiting resistance 270 voltage sample end 292 to this PWM controller 29.
Should auxiliary winding 30, this diode 313, this first resistance 311 and this second resistance 312 also constitutes a loop, at this moment, these auxiliary winding 30 equivalences are a power supply, by formula:
(ε represents the induced electromotive force of auxiliary winding 30, M represents that the elementary winding 241 and the mutual inductance of auxiliary winding 30 are several, I represents the electric current in the elementary winding 241) during electric current linear change in the elementary as can be known winding 241, should assist the induced electromotive force of winding 30 to remain unchanged, the Voltage Feedback of this second resistance 312 is to the voltage sample end 292 of this PWM controller 29, the feedback voltage of this feedback voltage and feedback circuit 28 is superimposed, this PWM controller 29 should total feedback voltage and its reference voltage compare, when feedback voltage was higher than its reference voltage, control end 291 output low levels of this PWM controller 29 quit work to control this transistor 27.
When this transistor 27 ended, the electric energy transmitting that this elementary winding 241 stores was to this secondary winding 242, and the output galvanic current is pressed after these second current rectifying and wave filtering circuit, 25 rectifications, filtering.The exciting current of this elementary winding 241 consumes by this protective circuit 23.
This power circuit 20 was carried out the flow point test: when input voltage was 100V, recording flow point at output 250 was 2.61A, and when input voltage was 240V, recording flow point at output 250 was 2.62A.This shows that the mistake flow point of these second current rectifying and wave filtering circuit, 25 outputs 250 is constant substantially.
Compared with prior art, power circuit 20 of the present invention increases by a compensating circuit 31 and feeds back with the voltage to input side, when input 211, when 212 AC power that connected change, this compensating circuit 20 will assist the induced voltage of winding 30 to feed back to the voltage sample end 292 of this PWM controller 29, the feedback voltage of this feedback voltage and this feedback circuit 28 is superimposed, this PWM controller 29 should total feedback voltage and its reference voltage compare and send control signal corresponding controlling this transistor 27, thereby make the mistake flow point of these power circuit 20 outputs stable.
Claims (4)
1. power circuit, it comprises one first current rectifying and wave filtering circuit, one isolates high frequency transformer, one second current rectifying and wave filtering circuit, one transistor, one feedback circuit and a PWM controller, this first current rectifying and wave filtering circuit comprises two inputs and an output, this isolation high frequency transformer comprises an elementary winding and a level winding, this second current rectifying and wave filtering circuit comprises two inputs and an output, this PWM controller comprises a control end and a voltage sample end, this elementary winding one end of isolating high frequency transformer is electrically connected with the output of this first current rectifying and wave filtering circuit, its other end is electrically connected with this transistorized source electrode, this secondary winding of isolating high frequency transformer is electrically connected with two inputs of this second current rectifying and wave filtering circuit, this transistorized grid is electrically connected with the control end of this PWM controller, this transistor drain is electrically connected with the voltage sample end of this PWM controller by this feedback circuit, this transistor drain is ground connection simultaneously, it is characterized in that: this power circuit also comprises a compensating circuit, this isolation high frequency transformer also comprises an auxiliary winding, this auxiliary winding one end of isolating high frequency transformer is electrically connected its other end ground connection by this compensating circuit with the voltage sample end of this PWM controller.
2. power circuit as claimed in claim 1, it is characterized in that: this compensating circuit comprises a diode, one first resistance and one second resistance, the positive pole of this diode is electrically connected with auxiliary winding one end of this isolation high frequency transformer, its negative pole is electrically connected with the voltage sample end of this PWM controller by this first resistance, and the voltage sample end of this PWM controller is simultaneously by this second grounding through resistance.
3. power circuit as claimed in claim 1 or 2, it is characterized in that: this first current rectifying and wave filtering circuit comprises a full bridge rectifier and a filter capacitor, two inputs of this full bridge rectifier i.e. two inputs of this first current rectifying and wave filtering circuit, the positive output end of this full bridge rectifier i.e. the output of this first current rectifying and wave filtering circuit, the negative output terminal ground connection of this full bridge rectifier, this filter capacitor are connected in parallel between the positive output end and negative output terminal of this full bridge rectifier.
4. power circuit as claimed in claim 3 is characterized in that: this power circuit also comprises a current-limiting resistance, and this current-limiting resistance is serially connected between this transistor drain and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101574511A CN101197539B (en) | 2006-12-08 | 2006-12-08 | Electric power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101574511A CN101197539B (en) | 2006-12-08 | 2006-12-08 | Electric power circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101197539A true CN101197539A (en) | 2008-06-11 |
| CN101197539B CN101197539B (en) | 2012-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101574511A Expired - Fee Related CN101197539B (en) | 2006-12-08 | 2006-12-08 | Electric power circuit |
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| CN (1) | CN101197539B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101801135A (en) * | 2010-03-17 | 2010-08-11 | 成都爱益迪电子科技有限公司 | High-efficiency and low-harmonic LED optical projection engine driving power supply |
| CN104600993A (en) * | 2012-12-21 | 2015-05-06 | 昂宝电子（上海）有限公司 | System and method for switching source poles and generating voltage |
| US9712065B2 (en) | 2012-12-21 | 2017-07-18 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for source switching and voltage generation |
| US10181795B2 (en) | 2017-03-30 | 2019-01-15 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for power converters with self-regulated power supplies |
| CN109344114A (en) * | 2018-09-28 | 2019-02-15 | 北京理工大学 | A kind of data transfer of computer anti-interference process device |
| WO2019205548A1 (en) * | 2018-04-26 | 2019-10-31 | 广东美的厨房电器制造有限公司 | Power supply apparatus and microwave cooking electric appliance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100377487C (en) * | 2004-08-12 | 2008-03-26 | 尼克森微电子股份有限公司 | Low power flyback exchanging circuit with primary side voltage feedback |
-
2006
- 2006-12-08 CN CN2006101574511A patent/CN101197539B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101801135A (en) * | 2010-03-17 | 2010-08-11 | 成都爱益迪电子科技有限公司 | High-efficiency and low-harmonic LED optical projection engine driving power supply |
| CN104600993A (en) * | 2012-12-21 | 2015-05-06 | 昂宝电子（上海）有限公司 | System and method for switching source poles and generating voltage |
| US9712065B2 (en) | 2012-12-21 | 2017-07-18 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for source switching and voltage generation |
| CN104600993B (en) * | 2012-12-21 | 2017-07-21 | 昂宝电子（上海）有限公司 | Switch the system and method generated with voltage for source electrode |
| US10256734B2 (en) | 2012-12-21 | 2019-04-09 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for source switching and voltage generation |
| US10944325B2 (en) | 2012-12-21 | 2021-03-09 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for source switching and voltage generation |
| US10181795B2 (en) | 2017-03-30 | 2019-01-15 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for power converters with self-regulated power supplies |
| US10505460B2 (en) | 2017-03-30 | 2019-12-10 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for power converters with self-regulated power supplies |
| US11139740B2 (en) | 2017-03-30 | 2021-10-05 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for power converters with self-regulated power supplies |
| WO2019205548A1 (en) * | 2018-04-26 | 2019-10-31 | 广东美的厨房电器制造有限公司 | Power supply apparatus and microwave cooking electric appliance |
| CN109344114A (en) * | 2018-09-28 | 2019-02-15 | 北京理工大学 | A kind of data transfer of computer anti-interference process device |
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| Publication number | Publication date |
|---|---|
| CN101197539B (en) | 2012-03-21 |
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| ASS | Succession or assignment of patent right |
Owner name: QIMEI ELECTRONIC CO LTD Free format text: FORMER OWNER: INNOLUX DISPLAY CO., LTD. Effective date: 20120119 |
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Effective date of registration: 20120119 Address after: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 1, floor 4, Applicant after: Qunkang Technology (Shenzhen) Co., Ltd. Co-applicant after: Chimei Optoelectronics Co., Ltd. Address before: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 1, floor 4, Applicant before: Qunkang Technology (Shenzhen) Co., Ltd. Co-applicant before: Innolux Display Group |
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Granted publication date: 20120321 Termination date: 20191208 |