CN1123973C - Low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator - Google Patents
Low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator Download PDFInfo
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- CN1123973C CN1123973C CN 99126954 CN99126954A CN1123973C CN 1123973 C CN1123973 C CN 1123973C CN 99126954 CN99126954 CN 99126954 CN 99126954 A CN99126954 A CN 99126954A CN 1123973 C CN1123973 C CN 1123973C
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- switching tube
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Abstract
The present invention discloses a low-loss MOS tube circuit with a single-ended flyback switch power supply, which comprises an MOS switch tube, a transformer, two diodes, two capacitors, a resistor and a load. Two common mode inductors L1 and L2 and a capacitor C3 are added in the primary side of the transformer so that the inductance of a primary side winding of the transformer and an impedance value in an LC oscillation circuit of distributed capacitors of the MOS switch tube are increased; furthermore, an oscillation amplitude value of a voltage value V<DS> between drain-source electrodes of the MOS switch tube is quickly attenuated; the circuit of the present invention can effectively suppress oscillating peak values, reduce switching loss, raise conversion efficiency as well as reliability and stability of power supply of the switch power supply.
Description
Technical field
The invention belongs to electronic technology field, relate in particular to a kind of switching power circuit.
Background technology
At present, the series inverter product is widely used in each field of industry, but frequency converter is very high to its power supply requirement.A kind of single-ended reverse exciting switching voltage regulator circuit commonly used in the existing Switching Power Supply.Sort circuit under the total energy transfer mode, after the former limit of transformer energy delivery finishes, the inductance of former limit winding coil can with the distributed capacitance C of MOS switching tube
DSForm oscillating circuit, produce electromagnetic viscosimeter.Experiment test shows that the amplitude of its vibration is very high, and attenuation process is slow; And, when the conducting of MOS switching tube, might make the magnitude of voltage V of its corresponding drain-source interpolar with different loads and duty ratio
DSBe oscillation peak, this will bring bigger switching loss, reduce conversion efficiency, also increase requirement and radiator volume to heat radiation simultaneously, make reliability, the stability of power supply power supply all decrease.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator, can suppress oscillation peak effectively, reduces switching loss, improve conversion efficiency, improves the reliability and the stability of Switching Power Supply power supply simultaneously.
The objective of the invention is to be achieved through the following technical solutions: construct a kind of low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator, comprise MOS switching tube M1, transformer TR, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, resistance R 1 and load RL; The drain D of described MOS switching tube M1 connects the different name end B of elementary winding NP of transformer TR and the positive pole of the first diode D1, source S ground connection; The negative pole of described first capacitor C 1 and resistance R 1 back one termination, the first diode D1 in parallel, the end A of the same name of the elementary winding NP of another termination; The end D of the same name of the secondary winding NS of a termination transformer TR after described second capacitor C 2 and the load RL parallel connection, the negative pole of another termination second diode D2, the positive pole of the second diode D2 meet the different name end C of secondary winding NS; It is characterized in that, be provided with the first common mode inductance L1, the second common mode inductance L2 and the 3rd capacitor C 3 on the former limit of transformer TR, the end A of the same name of the elementary winding NP of the described first common mode inductance L1, one termination transformer TR, another termination input port P; The second common mode inductance L2, one end ground connection, another termination input port N; The end A of the same name of the elementary winding NP of described the 3rd capacitor C 3 one termination transformer TR, other end ground connection; Resistance value in the LC oscillating circuit of distributed capacitance of the inductance of the former limit of transformer winding and MOS switching tube is increased, and then make the magnitude of voltage V of MOS switching tube drain-source interpolar
DSOscillation amplitude decay rapidly.
Aforesaid switching power circuit of the present invention, the first common mode inductance L1, the second common mode inductance L2 and the 3rd capacitor C 3 have been increased on the former limit of transformer TR, resistance value in the LC oscillating circuit of distributed capacitance of the inductance of the former limit of transformer winding and MOS switching tube is increased, and then make the magnitude of voltage V of MOS switching tube drain-source interpolar
DSOscillation amplitude decay rapidly.Like this, during each switching tube M1 conducting, V
DSAll approximate power input voltage Ui, and do not change, guarantee that Switching Power Supply works safely and reliably with the variation of load and duty ratio.Below in conjunction with accompanying drawing circuit of the present invention and prior art are compared.
Description of drawings
Fig. 1 is a kind of single-ended reverse exciting switching voltage regulator circuit commonly used now;
Fig. 2 is a low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator of the present invention.
Embodiment
By comparison diagram 1 and Fig. 2, the characteristics of switching power circuit of the present invention are: on the basis of available circuit, increase by the first common mode inductance L1, the second common mode inductance L2 and the 3rd capacitor C 3 on the former limit of transformer TR.This scheme is not used in the prior art always, mainly is because people are confined to too much in the thoughtcast of improving switching power circuit: drive circuit and the circuit topology figure by the change Switching Power Supply reduces switching loss, increase switching tube radiator volume is kept the switching tube limit of temperature rise.This traditional thinking set makes the technology of the present invention do not expected by people always and adopt, but the enforcement of this scheme has brought extraordinary technique effect.Select for use the 2SK1317 of Hitachi type MOS switching tube as M1 and 6mH inductance as common mode inductance L1, L2, carrying out emulation experiment proves, under the constant situation of circuit other parts, increase common mode inductance L1, L2 and capacitor C 3 on the former limit of transformer TR, can make the magnitude of voltage V of MOS switching tube drain-source interpolar
DSOscillation amplitude decay rapidly, corresponding oscillation peak situation is compared during with no common mode inductance, can make switching loss reduce about 30%.
Claims (2)
1, a kind of low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator comprises MOS switching tube (M1), transformer (TR), first diode (D1), second diode (D2), first electric capacity (C1), second electric capacity (C2), resistance (R1) and load (RL); The drain electrode (D) of described MOS switching tube (M1) connects the different name end (B) of elementary winding (NP) of transformer (TR) and the positive pole of first diode (D1), source electrode (S) ground connection; The negative pole of described first electric capacity (C1) and resistance (R1) back in parallel one termination, first diode (D1), the end of the same name (A) of the elementary winding of another termination (NP); The end of the same name (D) of the secondary winding (NS) of described second electric capacity (C2) and load (RL) back in parallel one termination transformer (TR), the negative pole of another termination second diode (D2), the positive pole of second diode (D2) connects the different name end (C) of secondary winding (NS), it is characterized in that, be provided with first common mode inductance (L1), second common mode inductance (L2) and the 3rd electric capacity (C3) on the former limit of transformer (TR), the end of the same name (A) of the elementary winding (NP) of described first inductance (L1) termination transformer (TR), another termination input port (P); Second inductance (L2) end ground connection, another termination input port (N); The end of the same name (A) of the 3rd electric capacity (C3) elementary winding of termination transformer (TR) (NP), other end ground connection; Resistance value in the LC oscillating circuit of distributed capacitance of the inductance of the former limit of transformer winding and MOS switching tube is increased, and then make the magnitude of voltage V of MOS switching tube drain-source interpolar
DSOscillation amplitude decay rapidly.
2, low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator according to claim 1 is characterized in that, described MOS switching tube (M1) is a N channel enhancement field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99126954 CN1123973C (en) | 1999-12-18 | 1999-12-18 | Low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99126954 CN1123973C (en) | 1999-12-18 | 1999-12-18 | Low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1269535A CN1269535A (en) | 2000-10-11 |
| CN1123973C true CN1123973C (en) | 2003-10-08 |
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ID=5284631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99126954 Expired - Fee Related CN1123973C (en) | 1999-12-18 | 1999-12-18 | Low-loss MOS transistor circuit for single-ended reverse exciting switching voltage regulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1123973C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236218B (en) * | 2008-02-26 | 2010-06-02 | 浙江大学 | AC/DC converter power switch tube drain voltage detection circuit |
| CN103415123A (en) * | 2013-08-28 | 2013-11-27 | 深圳市东方之星电源有限公司 | MOS fault protection circuit |
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1999
- 1999-12-18 CN CN 99126954 patent/CN1123973C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1269535A (en) | 2000-10-11 |
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Owner name: SHENZHEN ANSHENG ELECTRICAL CO., LTD. Free format text: FORMER OWNER: SHENZHEN HUAWEI ELECTRICAL CO., LTD. Effective date: 20010614 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Effective date of registration: 20010614 Address after: The first floor, the third floor, and the third floor of the electrical workshop of HUAWEI base, industrial zone, Longgang, Guangdong Applicant after: Ansheng Electric Co., Ltd., Shenzhen City Address before: Shenzhen HUAWEI production center, industrial zone, Guangdong, China Applicant before: Huawei Electric Co., Ltd., Shenzhen |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031008 Termination date: 20111218 |