CN101414786A - Switch power supply circuit - Google Patents
Switch power supply circuit Download PDFInfo
- Publication number
- CN101414786A CN101414786A CNA2007102021587A CN200710202158A CN101414786A CN 101414786 A CN101414786 A CN 101414786A CN A2007102021587 A CNA2007102021587 A CN A2007102021587A CN 200710202158 A CN200710202158 A CN 200710202158A CN 101414786 A CN101414786 A CN 101414786A
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- transformer
- diode
- primary coil
- oxide
- semiconductor
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Abstract
The invention relates to a switching power circuit which comprises a power supply, a transformer, a MOS pipe, an inductor and a first diode. The transformer comprises a primary coil and a secondary coil. An anode of the power supply is connected with a cathode of the first diode and one end of the primary coil of the transformer respectively. The cathode of the power supply is grounded. The anode of the first diode is connected with a drain electrode of the MOS pipe by the inductor. A source electrode of the MOS pipe is grounded. A grid electrode of the MOS pipe receives a PWM signal. The other end of the primary coil of the transformer is connected with a joint node of the MOS pipe and the inductor. The secondary coil of the transformer is used for driving a load. The switching power circuit can store the leaked energy of the primary coil of the transformer and return the stored energy to the primary coil of the transformer for reusing when the MOS pipe is conducted, so as to reduce the energy loss.
Description
Technical field
The present invention relates to a kind of power circuit, particularly a kind of switching power circuit that reduces energy loss.
Background technology
At present, in existing desktop and notebook computer, the power supply that is adopted all is based on Switching Power Supply, and Switching Power Supply has advantages such as efficient height, volume be little.But also consuming part energy, because when switch is in closed condition, transformer has remanent magnetism to exist to the transformer in the existing Switching Power Supply, generally is to clamp down on circuit by a degaussing circuit such as RC to go to absorb this part energy when transmitting energy.But along with switching frequency is more and more higher, the energy of the consumption of transformer is also just more and more, and how the Conversion of energy with this part is utilizable energy, is the industry urgent problem.
Summary of the invention
In view of foregoing, be necessary to provide a kind of switching power circuit that reduces energy loss.
A kind of switching power circuit, comprise a power supply, one transformer, one metal-oxide-semiconductor, one inductance and one first diode, described transformer comprises a primary coil and a level coil, the positive pole of described power supply is connected respectively to an end of the primary coil of the negative electrode of described first diode and transformer, the minus earth of described power supply, the anode of described first diode is connected to the drain electrode of described metal-oxide-semiconductor by described inductance, the source ground of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor receives a pwm signal, the other end of the primary coil of described transformer is connected on the connected node of described metal-oxide-semiconductor and described inductance, and the secondary coil of described transformer is in order to drive load.
Above-mentioned power switch circuit, connect an inductance and one first diode at the primary coil two ends of transformer, when metal-oxide-semiconductor ends, inductance is with the store energy of the primary coil leakage of transformer, and when the metal-oxide-semiconductor conducting, the energy of storage transferred back on the primary coil of transformer utilize again, reduced energy loss.
Description of drawings
The invention will be further described in conjunction with embodiment with reference to the accompanying drawings.
Fig. 1 is the circuit diagram of the better embodiment of switching power circuit of the present invention.
Embodiment
Please refer to Fig. 1, the better embodiment of switching circuit of the present invention comprises a power vd D, a transformer T1, a metal-oxide-semiconductor Q1, an inductance L 1, two diode D1 and D2, a resistance R 1 and a capacitor C 1.The positive pole of described power vd D is connected respectively to an end of the primary coil of the negative electrode of diode D1 and transformer T1, the minus earth of described power vd D.The anode of described diode D1 is connected to the drain electrode of described metal-oxide-semiconductor Q1 by described inductance L 1, and the source ground of described metal-oxide-semiconductor Q1, grid receive a pwm signal.The other end of described transformer T1 primary coil is connected to the connected node of described metal-oxide-semiconductor Q1 and described inductance L 1.One end of the secondary coil of described transformer T1 is connected to the anode of described diode D2, and described resistance R 1 and capacitor C 1 are connected in parallel between the other end of the negative electrode of described diode D2 and described secondary coil.
When the pwm signal that receives when the grid of metal-oxide-semiconductor Q1 is high level, metal-oxide-semiconductor Q1 conducting, the electric current of power vd D output flows through the primary coil of transformer T1, T1 is coupled to secondary coil with energy by transformer, produce induced voltage in second coil side, induced voltage outputs in the follow-up load circuit after capacitor C 1, resistance R 1, for follow-up load circuit provides stable operating voltage.
When the pwm signal that receives when the grid of metal-oxide-semiconductor Q1 becomes low level, metal-oxide-semiconductor Q1 ends, the voltage reversal at transformer T1 primary coil two ends, the primary coil of transformer T1, inductance L 1 and diode D1 form current circuit, the primary coil of transformer T1 is inductance L 1 charging, stores the energy in the inductance L 1.When the pwm signal that receives when the grid of metal-oxide-semiconductor Q1 became high level again, the voltage reversal at described inductance L 1 two ends transferred back to the energy of storage on the primary coil of transformer T1 through diode D1, has realized the utilization again of energy, has reduced loss.
Above-mentioned power switch circuit, connect an inductance L 1 and diode D1 at the primary coil two ends of transformer T1, when metal-oxide-semiconductor Q1 ends, inductance L 1 stores the primary coil energy remaining of transformer T1, and when metal-oxide-semiconductor Q1 conducting, inductance L 1 transfers back to the energy of storage on the primary coil of transformer T1 and utilizes again, reduces energy loss.
Claims (2)
- [claim 1] a kind of switching power circuit, comprise a power supply, one transformer, one metal-oxide-semiconductor, one inductance and one first diode, described transformer comprises a primary coil and a level coil, the positive pole of described power supply is connected respectively to an end of the primary coil of the negative electrode of described first diode and transformer, the minus earth of described power supply, the anode of described first diode is connected to the drain electrode of described metal-oxide-semiconductor by described inductance, the source ground of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor receives a pwm signal, the other end of the primary coil of described transformer is connected on the connected node of described metal-oxide-semiconductor and described inductance, and the secondary coil of described transformer is in order to drive load.
- [claim 2] switching power circuit as claimed in claim 1, it is characterized in that: described switching power circuit also comprises one second diode, one first electric capacity and a resistance, the anode of described second diode is connected to an end of described transformer secondary output coil, and described first electric capacity and described resistance are connected in parallel between the other end of the negative electrode of described second diode and described transformer secondary output coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102021587A CN101414786A (en) | 2007-10-19 | 2007-10-19 | Switch power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102021587A CN101414786A (en) | 2007-10-19 | 2007-10-19 | Switch power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101414786A true CN101414786A (en) | 2009-04-22 |
Family
ID=40595157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007102021587A Pending CN101414786A (en) | 2007-10-19 | 2007-10-19 | Switch power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101414786A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016073700A1 (en) * | 2014-11-05 | 2016-05-12 | Rornpower Energy Systems, Inc. | Partial time active clamp flyback |
| CN109324222A (en) * | 2018-11-23 | 2019-02-12 | 江苏林洋能源股份有限公司 | Quick detection of power loss system and method based on reverse exciting topological |
-
2007
- 2007-10-19 CN CNA2007102021587A patent/CN101414786A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016073700A1 (en) * | 2014-11-05 | 2016-05-12 | Rornpower Energy Systems, Inc. | Partial time active clamp flyback |
| CN109324222A (en) * | 2018-11-23 | 2019-02-12 | 江苏林洋能源股份有限公司 | Quick detection of power loss system and method based on reverse exciting topological |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090422 |