KR890000657Y1 - Clamping circuit - Google Patents
Clamping circuit Download PDFInfo
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- KR890000657Y1 KR890000657Y1 KR2019850017285U KR850017285U KR890000657Y1 KR 890000657 Y1 KR890000657 Y1 KR 890000657Y1 KR 2019850017285 U KR2019850017285 U KR 2019850017285U KR 850017285 U KR850017285 U KR 850017285U KR 890000657 Y1 KR890000657 Y1 KR 890000657Y1
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- Prior art keywords
- transformer
- switching transistor
- circuit
- primary winding
- clamping
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Classifications
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- 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
-
- 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
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 회로도.1 is a conventional circuit diagram.
제2도는 본 고안의 회로도이다.2 is a circuit diagram of the present invention.
*도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1,11 : 배전압정류회로 2,12 : 트랜스포머1,11: double voltage rectifier circuit 2,12: transformer
3,13 : 필터회로 4,14 : 절연트랜스3,13: filter circuit 4,14: insulation transformer
5,15 : 콘트롤회로 6 : 클램핑회로5,15 control circuit 6 clamping circuit
7 : 스너버회로 Tr1,TR11: 스위칭트랜지스터7: Snubber circuit Tr 1 , TR 11 : Switching transistor
S1,S11: 트랜스포머의 1차측권선 S3,S4,S13,S14: 트랜스포머의 2차측권선S 1 , S 11 : Primary winding of transformer S 3 , S 4, S 13 , S 14 : Secondary winding of transformer
S12: 클램핑코일 D17: 클램핑 다이오드S 12 : clamping coil D 17 : clamping diode
본 고안은 스위칭전원공급장치의 클램핑회로에 관한 것으로,특히 클램핑코일을 이용하여 회로구성을 간단하게 한 스위칭전원공급장치의 클램핑회로에 관한 것이다.The present invention relates to a clamping circuit of a switching power supply, and more particularly, to a clamping circuit of a switching power supply using a clamping coil to simplify the circuit configuration.
일반적으로,스위칭전원공급장치는 그 1차회로에 있는 스위칭 트랜지스터가 오프되는 순간 트랜스포머의 1차측권선에 역기전력이 발생되므로 스위칭트랜지스터의 컬렉터에 높은 서지전압(surge voltage)이 걸리게 된다.In general, the switching power supply has a high surge voltage on the collector of the switching transistor because back electromotive force is generated in the primary winding of the transformer when the switching transistor in the primary circuit is turned off.
따라서,스위칭트랜지스터가 턴온되게 되면 스위칭트랜지스터에 높은 전류가 흐르게 되므로 스위칭트랜지스터가 높은 전류가 흐르게 되므로 스위칭트랜지스터가 손상되게 되는바,이에 대하여 종래에는,제1도 도시된 바와같이,배전압정류회로(1)에 연결되어 있는 트랜스포머(2)의 1차측권선(S1)과 스위칭트랜지스터(Tr1)의 컬렉터 사이에다 저항(R3)과 콘덴서(C3)및 다이오드(D5)로 구성된 클램핑회로(6)와,저항(R4)과 콘덴서(C4)및 다이오드(D6)로 구성된 스너버회로(sunbber circuit;7)를 연결해 놓음으로서,스위칭트랜지스터(Tr1)가 오프될때 트랜스포머(2)에서 발생되는 높은 서지전압이 스위칭트랜지스터(Tr1)의 컬렉터에 인가되는 것을 억제시켜 스위칭트랜지스터(Tr1)가 손상되는 것을 방지하도록 되어 있었다.Therefore, when the switching transistor is turned on, a high current flows in the switching transistor, so that a high current flows in the switching transistor, so that the switching transistor is damaged. In the related art, as shown in FIG. A clamping circuit consisting of a resistor (R 3 ), a capacitor (C 3 ), and a diode (D 5 ) between the primary winding (S 1 ) of the transformer (2) and the collector of the switching transistor (Tr 1 ) connected to 1 ). (6) and a snubber circuit (7) consisting of a resistor (R 4 ), a capacitor (C 4 ) and a diode (D 6 ) are connected to each other so that the transformer (2) when the switching transistor (Tr 1 ) is turned off. ) to a high surge voltage is generated in the suppression from being applied to the collector of a switching transistor (Tr 1) was to prevent damage to the switching transistor (Tr 1).
그러나,상기와 같은 방법은 트랜지스포머(2)의 결합도에 따라 변화되는 서지전압이 클램핑회로(6)를 통하여 다시 트랜스포머(2)의 1차측권선(S1)에 인가되게 되므로,트랜스포머(2)에서는 열이 발생될뿐만 아니라 스위칭트랜지스터(Tr1)의 컬렉터에 걸리는 서지전압을 강하시키기 위해서 다수개의 회로소자가 사용되어져야 하기 때문에 회로구성이 복잡해짐은 물론 제품의 제료비용이 상승되게되는 문제가 있었다.However, in the above method, since the surge voltage which is changed according to the coupling degree of the transformer 2 is applied to the primary side winding S 1 of the transformer 2 again through the clamping circuit 6, the transformer In (2), not only heat is generated but also a plurality of circuit elements have to be used to lower the surge voltage applied to the collector of the switching transistor Tr 1 , resulting in complicated circuit configuration and increased product material cost. There was a problem.
본 고안은 상기한 문제점을 해결한것으로서,트랜스포머의 1차측권선수와 동일한 권선수를 가지면서 반대방향으로 감겨진 클램핑코일과 다이오드를 조합하여,스위칭트랜지스터가 오프될때 트랜스포머에서 발생되는 서지전압을 제거시켜 스위칭트랜지스터에 높은 전압이 걸리게 되는 것을 억제시킴에 따라, 스위칭트랜지스터가 손상되는 것을 방지하도록 된 스위칭전원공급장치의 클램핑회로를 제공하고자 함에 그 목적이 있다.The present invention solves the above problems, by combining the clamping coil and the diode wound in the opposite direction with the same number of turns as the primary winding of the transformer, to eliminate the surge voltage generated in the transformer when the switching transistor is off It is an object of the present invention to provide a clamping circuit of a switching power supply which is designed to prevent the switching transistor from being damaged by suppressing the application of a high voltage to the switching transistor.
이하 본고안의 구성및 작용,효과를 예시도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the configuration, operation, and effects of the present disclosure will be described in detail with reference to the accompanying drawings.
본 고안은 배전압정류회로(11)가 트랜스포머(12)의 1차측권선(S11)에 연결되고,상기 트랜스포머(12)의 1차측권선(S11)은 스위칭트랜지스터(Tr11)의 컬렉터에 연결되며,상기 트랜스포머(12)의 2차측권선(S13)(S14)이 필터회로(13)에 연결되고,상기 필터회로(13)는 절연트랜스(14)와 콘트롤회로(15)를 매개하여 상기 스위칭트랜지스터(Tr11)의 베이스에 접속되며,트랜스포머(12)의 1차측권선(S11)과 같은 권선수를 갖을며 반대방향으로 감겨진 클램핑코일(S12)과 상기 클램핑코일(S12)에 역방향으로 직렬 접속된 다이오드(D17)가 트랜스포머(12)의 1차측권선(S11)과 병렬접속된 구조로 되어있다.According to the present invention, the double-voltage rectifier circuit 11 is connected to the primary side winding S 11 of the transformer 12, and the primary side winding S 11 of the transformer 12 is connected to the collector of the switching transistor Tr 11 . The secondary side windings S 13 and S 14 of the transformer 12 are connected to the filter circuit 13, and the filter circuit 13 mediates the insulation transformer 14 and the control circuit 15. Is connected to the base of the switching transistor Tr 11 and has the same number of turns as the primary winding S 11 of the transformer 12 and is wound in the opposite direction with the clamping coil S 12 and the clamping coil S The diode D 17 connected in series in the reverse direction to 12 ) has a structure connected in parallel with the primary winding S 11 of the transformer 12.
도면의 미설명부호 DC1,DC2는 직류전압출력단을 나타낸다.In the drawings, reference numerals DC 1 and DC 2 denote DC voltage output terminals.
제2도는 상기한 구조로 되어 있는 본 고안의 회로도로서,교류전원이 배전압정류회로(11)를 통과하면서 정류되어 트랜스포머(12)의 1차측권선(S11)과 클램핑코일(S12)에 인가된다.여기서,스위칭트랜지스터(Tr11)의 베이스에 콘트롤회로(15)로부터 듀티싸이클중 하이레벨이 인가되면 스위칭트랜지스터(Tr11)가 턴온되며 트랜스포머(12)의 1차측권선(S11)에는 스위칭트랜지스터(Tr11)로 흘러나가는 전류방향과 반대로 기전력이 발생되고,그에 따라 클램핑코일(S12)에도 트랜스포머(12)의 1차측 권선과 반대방향으로 기전력이 발생된다.이때,트랜스포머(12)의 2차측권선(S13)(S14)에 유기되는 전류는 1차측권선에 쇄고하는 자속에 의하여 결정되는데 자속쇄고 수가1만큼 변화되면1[V]의 기전력이 유기된다.다음에, 스위칭트랜지스터(Tr11)의 베이스에 콘트롤회로(15)에서 출력된 듀티싸이클중 로우레벨의 신호가 공급되면 스위칭트랜지스터(Tr11)는 턴오프되고 트랜스포머(12)의 1차측권선(S11)의 전류는 차단되게되며,그에 따라 높은 역기전력이 전류의 흐름을 방해하는 방향으로 발생되고 코일의 반작용에 의하여 진동하게 되며, 그에 따라 높은 서지전압이 발생된다. 이때,클램핑코일(S12)에서는 트랜스포머(12)의 1차측권선에서 발생된 기전력과 동일한 세기의 기전력이 발생하게 되어 이들 두 기전력은 상호 전자 유도 작용에 의하여 상쇄하고 트랜지스포머(12)에서 발생되는 서지전압이 제거되는 것이다. 따라서,스위칭트랜지스터(Tr11)의 컬렉터에 걸리는 서지전압을 제거시키게 됨에 따라 스위칭트랜지스터(Tr11)가 턴온되는 순간에 스위칭트랜지스터(Tr11)가 턴온되는 순간에 스위칭트랜지스터(Tr11)에 높은 서지전압이 유입되는 것을 억제하게되어 스위칭트랜지스터(Tr11)의 손상을 방지하게 되는 것이다.여기서,스위칭트랜 지스터(Tr11)는 트랜스포머(12)의 2차측권선(S3)(S4)에 유기된 전류가 필터회로(13)로 거쳐서 절연트랜스(14)와 콘트롤회로(15)에 궤환되어 공급되면 콘트롤회로(15)에서는 필터회로(13)부터 입력된 레벨에 따라 듀티싸이클을 발생하게 되는데, 이신호는 스위칭트랜지스터(Tr11)의 베이스에 인가되며,그에따라 스위칭트랜좃뵀?Tr11)의 베이스에 인가되며, 그에따라 스위칭트랜지스터(Tr11)의 온 오프시간이 조절되어 트랜스포머(12)의 2차측권선(S3)(S4)에 유기되는 전류가 조절된다.2 is a circuit diagram of the present invention having the above-described structure, the AC power supply is rectified while passing through the double-voltage rectifier circuit 11 to the primary winding S 11 and the clamping coil S 12 of the transformer 12 . is is, where, of the switching transistor (Tr 11), the duty cycle from the control circuit 15 to the base of when the high level applied to the switching transistor (Tr 11) is turned on, and is the primary winding (S 11) of the transformer (12) The electromotive force is generated in the opposite direction to the current flowing into the switching transistor Tr 11 , and thus the electromotive force is generated in the clamping coil S 12 in the opposite direction to the primary winding of the transformer 12. The current induced in the secondary winding S 13 and S 14 of is determined by the magnetic flux writting in the primary winding, and when the number of magnetic flux chains is changed by 1, an electromotive force of 1 [V] is induced. Next, the switching transistor (Tr 11) controls the base of the times After 15 the duty cycle low level signal is supplied from the output from the switching transistor (Tr 11) is to be turned off and the current is cut off in the primary winding (S 11) of the transformer 12, a high counter electromotive force accordingly It is generated in the direction of disturbing the flow of current and vibrates by the reaction of the coil, thereby generating a high surge voltage. At this time, the clamping coil (S 12 ) generates an electromotive force of the same intensity as the electromotive force generated in the primary side winding of the transformer 12, these two electromotive forces are canceled by mutual electromagnetic induction action and in the transformer 12 The generated surge voltage is eliminated. Thus, the switching transistor (Tr 11) is high to a switching transistor (Tr 11) on which the turn-on switching transistor (Tr 11) to be turned on every moment surge as thereby eliminate the surge voltage across the collector of the switching transistor (Tr 11) The voltage is suppressed from being introduced to prevent damage to the switching transistor Tr 11. Here, the switching transistor Tr 11 is induced in the secondary winding S 3 and S 4 of the transformer 12. When the supplied current is fed back to the insulating transformer 14 and the control circuit 15 via the filter circuit 13, the control circuit 15 generates a duty cycle according to the level input from the filter circuit 13, yisinho is applied to the base of the switching transistor (Tr 11), is applied to the base of the switching transient jotbwaet? Tr 11), and therefore, the on-off time of the switching transistor (Tr 11) adjusted accordingly, the transformer (12) The current induced in the secondary winding (S 3) (S 4) is controlled.
한편,트랜스포머(12)의 1차측권선(S11)에서 발생되는 열에 의한 손실도 트랜스포머(12)의 1차측권선(S11)의 온도와 클램핑코일(S12)의 온도가 같게되므로 전혀 없게 되는 것이다.On the other hand, the loss due to heat generated in the primary winding S 11 of the transformer 12 is also not at all because the temperature of the primary winding S 11 of the transformer 12 is equal to the temperature of the clamping coil S 12 . will be.
상기한 바와같이 본 고안은 클램핑코일을 사용하여 트랜스포머의 1차측권선에서 발생되는 높은 서지전압에 의해 스위칭트랜지스터가 손상되는 것을 최대한 줄일수 있게 되는 동시에 회로의 구성이 간편하게 되어 제품의 원가가 절감되는 효과가 있다.As described above, the present invention can reduce the damage of the switching transistor by the high surge voltage generated from the primary winding of the transformer by using the clamping coil as much as possible, and the circuit configuration is simplified, thereby reducing the cost of the product. There is.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850017285U KR890000657Y1 (en) | 1985-12-21 | 1985-12-21 | Clamping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850017285U KR890000657Y1 (en) | 1985-12-21 | 1985-12-21 | Clamping circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870011412U KR870011412U (en) | 1987-07-16 |
| KR890000657Y1 true KR890000657Y1 (en) | 1989-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850017285U KR890000657Y1 (en) | 1985-12-21 | 1985-12-21 | Clamping circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR890000657Y1 (en) |
-
1985
- 1985-12-21 KR KR2019850017285U patent/KR890000657Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR870011412U (en) | 1987-07-16 |
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