CN203056968U - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN203056968U CN203056968U CN 201220734540 CN201220734540U CN203056968U CN 203056968 U CN203056968 U CN 203056968U CN 201220734540 CN201220734540 CN 201220734540 CN 201220734540 U CN201220734540 U CN 201220734540U CN 203056968 U CN203056968 U CN 203056968U
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Abstract
A power supply circuit comprises a driving circuit and an output rectification circuit which is used for outputting power under the control of the driving circuit. In the driving circuit, a primary winding (T1A) of a first transformer (T1) outputs a pulse width control signal; a resistor (R3), a first secondary winding (T1B) and a second secondary winding (T1C) of the first transformer (T1) and a resistor (R4) are sequentially connected in series; the other ends of the resistor (R3) and the resistor (R4) respectively outputs PWM pulses to the output rectification circuit; two ends of the secondary windings of the first transformer (T1) are connected to ground respectively through diodes (D1, D2); and an auxiliary power supply is generated at a node (C) between the first secondary winding (T1B) and the second secondary winding (T1C) of the first transformer (T1) through rectification of the diodes. The power supply circuit not only provides the auxiliary power supply, but also arranges waveforms of the PWM pulses.
Description
Technical field
The utility model relates to electronic circuit field, particularly a kind of power circuit.
Background technology
In application of power, when output voltage lower, when output current is big, in order to improve the delivery efficiency of product, can change the rectifying tube of transformer output into MOSFET(Metal-Oxide-Semiconductor Field-Effect Transistor by diode rectification, metal-oxide half field effect transistor is hereinafter to be referred as field effect transistor) rectification, reduce the loss of electric energy in rectifying tube.
But, during with the MOSFET rectification, just need PWM(Pulse Width Modulation, pulse width modulation just need be arranged this time to the conducting of MOSFET with by controlling) and drive circuit.Driving to MOSFET has self-powered and it to drive dual mode, increases its crystal drive circuit with regard to needs when driven MOSFET needs big current drives or self-powered not to satisfy.
When it drives, if to pwm pulse through the arrangement, rising edge and trailing edge time are longer, perhaps driving force a little less than, so all can increase the conducting of rectification MOSFET and the loss that ends, thereby efficient is not high.
Summary of the invention
The purpose of this utility model is to provide a kind of power circuit that can strengthen providing again through the drive waveforms after the shaping accessory power supply.
A kind of power circuit comprises: be used for PWM(Pulse Width Modulation, pulse width modulation) drive circuit put in order of the rising edge of pulse and trailing edge, and the output rectification circuit that is used for out-put supply under the control of the pwm pulse of drive circuit output; Drive circuit comprises: the first transformer T1, resistance R 3, R4, diode D1, D2; The elementary winding T1A input pulse-width control signal of the first transformer T1; The first secondary winding T1B, second subprime winding T1C and the resistance R 4 of resistance R 3, the first transformer T1 are connected in series successively; The other end of the other end of resistance R 3 and resistance R 4 is exported pwm pulse respectively and is given output rectification circuit; The first secondary winding T1B of the first transformer T1 and the node between the resistance R 3 are node A, second subprime winding T1C and the node between the resistance R 4 of the first transformer T1 are Node B, and node A and Node B are respectively by inner diode D1, the D2 ground connection of anode altogether; The first secondary winding T1B of the first transformer T1 and the node C between the second subprime winding T1C produce an accessory power supply through diode D1, D2 rectification.
Embodiment of the present utility model not only can solve the problem of accessory power supply required in the power circuit of the isolation drive that adopts the field effect transistor rectification, can also further put in order the waveform of pwm pulse.
Description of drawings
Fig. 1 is the electrical block diagram of first embodiment of a kind of power circuit of the utility model;
Fig. 2 is for being the electrical block diagram of second embodiment of a kind of power circuit of the utility model.
Embodiment
Below in conjunction with drawings and Examples invention is described in detail.
Referring to Fig. 1, first embodiment of a kind of power circuit of the utility model, it comprises: drive circuit 110, and output rectification circuit 200.
Wherein, drive circuit 110 is used for the rising edge of pwm pulse and rises down along putting in order, the rising edge of shortening pwm pulse and the time of trailing edge, and an accessory power supply VCC is provided; Output rectification circuit 200 is used for out-put supply Vout under the control of the pwm pulse of drive circuit 110 outputs.
The first transformer T1 is the isolation drive transformer, and it comprises: elementary winding T1A, the first secondary winding T1B and second subprime winding T1C.The elementary winding T1A of the first transformer T1 connects pulse-width control signal, and the first secondary winding T1B, second subprime winding T1C and the resistance R 4 of resistance R 3, the first transformer T1 are connected in series successively.The other end of the other end of resistance R 3 and resistance R 4 is exported pwm pulse respectively and is given output rectification circuit 200.
The first secondary winding T1B of the first transformer T1 and the node between the resistance R 3 are node A, second subprime winding T1C and the node between the resistance R 4 of the first transformer T1 are Node B, and node A and Node B are respectively by inner diode D1, the D2 ground connection of anode altogether.
The first secondary winding T1B of the first transformer T1 and the node C between the second subprime winding T1C are through filtering capacitor C 2 filtering and diode D1, accessory power supply VCC of D2 rectification generation.That is node C connects the positive pole of filter capacitor C2, and the negative pole of filter capacitor C2 meets rectifier diode D1, D2 respectively to node A, B.Need to prove that wherein filter capacitor is selectable unit, that is, node C can only produce an accessory power supply VCC through diode D1, D2 rectification.
Accessory power supply VCC can be provided power supply with its circuit altogether.
The second transformer T2 is the output main transformer, the output circuit of main power just, and it comprises elementary winding T2A, the first secondary winding T2B, second subprime winding T2C.The elementary winding T2A of the second transformer T2 can receive any AC power, the first secondary winding T2B and the second subprime winding T2C of the second transformer T2 are connected in series, the first secondary winding T2B is ground connection after field effect transistor Q1 rectification, the grid of field effect transistor Q1 receives the pwm pulse of drive circuit output, concrete, be to connect resistance R 3; Second subprime winding T2C is ground connection after field effect transistor Q2 rectification, and the grid of field effect transistor Q2 receives the pwm pulse of drive circuit output, and is concrete, is to connect resistance R 4.
Node between the first secondary winding T2B and the second subprime winding T2C connects inductance L 1 energy storage, and through capacitor C 1 filtering, through field effect transistor Q2 and Q1 rectification, can be with the main output voltage of high power load thereby reach output.Need to prove that wherein filter capacitor is selectable unit, that is, the node between the first secondary winding T2B and the second subprime winding T2C is 1 energy storage of process inductance L only, and through output main output voltage Vout after field effect transistor Q2 and Q1 rectification.
Referring to Fig. 2, first embodiment of a kind of power circuit of the utility model, it comprises: drive circuit 110, and output rectification circuit 200.
Be that with the embodiment difference drive circuit 120 comprises that also first totem-pote circuit and second totem-pote circuit are respectively applied to improve the driving force of the two-way pwm pulse of drive circuit 120 outputs.Particularly:
The first transformer T1 is driving transformer, and it comprises: elementary winding T1A, the first secondary winding T1B and second subprime winding T1C.The elementary winding T1A of the first transformer T1 connects pulse-width control signal, and the first secondary winding T1B of first totem-pote circuit, resistance R 3, the first transformer T1, second subprime winding T1C resistance R 4 and second totem-pote circuit are connected in series successively.The other end of the other end of first totem-pote circuit and second totem-pote circuit is exported PWM respectively and is given output rectification circuit 200.
The first secondary winding T1B of the first transformer T1 and the node between the resistance R 3 are node A, second subprime winding T1C and the node between the resistance R 4 of the first transformer T1 are Node B, and node A and Node B are respectively by inner diode D1, the D2 ground connection of anode altogether.
The first secondary winding T1B of the first transformer T1 and the tie point C between the second subprime winding T1C are through capacitor C 2 filtering and diode D1, accessory power supply VCC of D2 rectification generation.
Accessory power supply VCC gives first totem-pote circuit, the power supply of second totem-pote circuit, also can give other and its altogether circuit supply.
Concrete, first totem-pote circuit comprises switching tube Q4, Q5, switching tube Q4, Q5 are connected in series between accessory power supply VCC and the ground, the control of switching tube Q4, Q5 is connected in resistance R 3 extremely jointly, and one road pwm pulse of the tie point output driving circuit 120 between switching tube Q4, the Q5 is to rectification circuit 200.Wherein, switching tube Q4, Q5 can be a PNP triode and a NPN triode, then control the very base stage of triode; Also can be MOSFET and MOSFET(field effect transistor that P links up that a N links up), then the above-mentioned control utmost point refers to its grid.
Second totem-pote circuit comprises switching tube Q6, Q3, switching tube Q6, Q3 are connected in series between accessory power supply VCC and the ground, the control of switching tube Q6, Q3 is connected in resistance R 4 extremely jointly, and another road pwm pulse of the tie point output driving circuit 120 between switching tube Q6, the Q3 is to rectification circuit 200.Wherein, switching tube Q6, Q3 can be a PNP triode and a NPN triode, then control the very base stage of triode; Also can be MOSFET and MOSFET that P links up that a N links up, then the above-mentioned control utmost point refers to its grid.
Then the grid of the field effect transistor Q1 in the output rectification circuit 200 receives the pwm pulse of first totem-pote circuit output, and is concrete, is the tie point that is connected between switching tube Q5, the Q4; The grid of field effect transistor Q2 receives the pwm pulse of second totem-pote circuit output, and is concrete, is the tie point that is connected between switching tube Q6, the Q3.Output rectification circuit 200 other structures and signal flow to all identical with embodiment one, give unnecessary details no longer one by one herein.
Above-mentioned embodiment illustrates but does not limit the present invention that those skilled in the art can design a plurality of examples that replace within the scope of the claims.The those skilled in the art should be appreciated that there not being violation within the defined scope of the present invention, can make suitable adjustment, modification etc. as appended claims to specific implementation.Therefore, all according to the spirit and principles in the present invention, any modifications and variations of doing are all within the defined scope of the present invention of appended claims.
Claims (8)
1. power circuit, it comprises: be used for drive circuit that rising edge and the trailing edge of pwm pulse are put in order, and the output rectification circuit that is used for out-put supply under the control of the pwm pulse of described drive circuit output;
Described drive circuit comprises: the first transformer T1, resistance R 3, R4, diode D1, D2;
The elementary winding T1A input pulse-width control signal of the described first transformer T1; The first secondary winding T1B, second subprime winding T1C and the described resistance R 4 of described resistance R 3, the described first transformer T1 are connected in series successively; The other end of the other end of described resistance R 3 and described resistance R 4 is exported described pwm pulse respectively and is given described output rectification circuit;
The first secondary winding T1B of the described first transformer T1 and the node between the described resistance R 3 are node A, second subprime winding T1C and the node between the described resistance R 4 of the described first transformer T1 are Node B, and described node A and described Node B are respectively by inner described diode D1, the D2 ground connection of anode altogether;
The first secondary winding T1B of the described first transformer T1 and the node C between the second subprime winding T1C produce an accessory power supply through described diode D1, D2 rectification.
2. power circuit as claimed in claim 1, wherein, described drive circuit also comprises filter capacitor C2; Then the first secondary winding T1B of the described first transformer T1 and the node C between second subprime winding T1C process described filter capacitor C2 filtering and described diode D1, D2 rectification produce described accessory power supply VCC.
3. power circuit as claimed in claim 1, wherein, described drive circuit also comprises first totem-pote circuit and second totem-pote circuit, and described first totem-pote circuit and described second totem-pote circuit are respectively applied to improve the driving force of described pwm pulse;
The first secondary winding T1B of described first totem-pote circuit, described resistance R 3, the described first transformer T1, second subprime winding T1C resistance R 4 and described second totem-pote circuit are connected in series successively; The other end of the other end of described first totem-pote circuit and described second totem-pote circuit is exported described pwm pulse respectively and is given output rectification circuit; Wherein, described accessory power supply is given described first totem-pote circuit, the power supply of described second totem-pote circuit.
4. power circuit as claimed in claim 3, wherein, described first totem-pote circuit comprises switching tube Q4, Q5; Described switching tube Q4, Q5 are connected in series between described accessory power supply and the ground, and the control of described switching tube Q4, Q5 is connected in described resistance R 3 extremely jointly, and the tie point between described switching tube Q4, the Q5 is exported one tunnel described pwm pulse to rectification circuit.
5. power circuit as claimed in claim 4, wherein, described switching tube Q4, Q5 are respectively a PNP triode and a NPN triode, then the described control base stage of switching tube Q4, Q5 very; Or N MOSFET and the MOSFET that P links up of linking up, the then described control grid of switching tube Q4, Q5 very.
6. power circuit as claimed in claim 3, wherein, described second totem-pote circuit comprises switching tube Q6, Q3; Described switching tube Q6, Q3 are connected in series between described accessory power supply and the ground, and the control of described switching tube Q6, Q3 is connected in described resistance R 4 extremely jointly, and the tie point between described switching tube Q6, the Q3 is exported the described pwm pulse in another road to described rectification circuit.
7. power circuit as claimed in claim 6, wherein, described switching tube Q6, Q3 are respectively a PNP triode and a NPN triode, then the base stage of the very described switching tube Q6 of described control, Q3; Perhaps be respectively MOSFET and MOSFET that P links up that N links up, the described control utmost point grid that is described switching tube then.
8. as any described power circuit in the claim 1 to 7, wherein, described output rectification circuit comprises: the second transformer T2, for field effect transistor Q1, the Q2 of rectification;
The described second transformer T2 is the output circuit of main power, the elementary winding T2A of the described second transformer T2 receives the AC-AC power supply, the first secondary winding T2B and the second subprime winding T2C of the described second transformer T2 are connected in series, described first secondary winding T2B ground connection after described field effect transistor Q1 rectification, the grid of described field effect transistor Q1 receive one tunnel described pwm pulse of described drive circuit output; Described second subprime winding T2C ground connection after described field effect transistor Q2 rectification, the grid of described field effect transistor Q2 receive the described pwm pulse in another road of described drive circuit output;
The first secondary winding T2B and the node between the second subprime winding T2C of the described second transformer T2 connect described inductance L 1 energy storage, and export main output voltage after described field effect transistor Q2 and Q1 rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220734540 CN203056968U (en) | 2012-12-28 | 2012-12-28 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220734540 CN203056968U (en) | 2012-12-28 | 2012-12-28 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203056968U true CN203056968U (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220734540 Expired - Fee Related CN203056968U (en) | 2012-12-28 | 2012-12-28 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203056968U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769304A (en) * | 2016-02-05 | 2018-03-06 | 广东欧珀移动通信有限公司 | Charging system, charging method and power supply adaptor for terminal |
| US10910852B2 (en) | 2016-07-26 | 2021-02-02 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, charging method, and power adapter |
-
2012
- 2012-12-28 CN CN 201220734540 patent/CN203056968U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769304A (en) * | 2016-02-05 | 2018-03-06 | 广东欧珀移动通信有限公司 | Charging system, charging method and power supply adaptor for terminal |
| CN107769304B (en) * | 2016-02-05 | 2020-02-11 | Oppo广东移动通信有限公司 | Charging system, charging method for terminal and power adapter |
| US10727687B2 (en) | 2016-02-05 | 2020-07-28 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system and method for terminal, power adapter and charging device |
| US10910852B2 (en) | 2016-07-26 | 2021-02-02 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, charging method, and power adapter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN JINGFUYUAN TECH. CO., LTD. Free format text: FORMER NAME: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park 12 Building 1, 2, 5 floor Patentee after: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. Address before: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park twelfth 5 floor Patentee before: Shenzhen Jingfuyuan Tech Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20151228 |
|
| EXPY | Termination of patent right or utility model |