KR970004437B1 - Switching power trans. secondary rectifying short protection circuit - Google Patents

Switching power trans. secondary rectifying short protection circuit Download PDF

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Publication number
KR970004437B1
KR970004437B1 KR1019930007313A KR930007313A KR970004437B1 KR 970004437 B1 KR970004437 B1 KR 970004437B1 KR 1019930007313 A KR1019930007313 A KR 1019930007313A KR 930007313 A KR930007313 A KR 930007313A KR 970004437 B1 KR970004437 B1 KR 970004437B1
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South Korea
Prior art keywords
transistor
diode
transformer
stage
switching power
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KR1019930007313A
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Korean (ko)
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노관형
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대우전자 주식회사
배순훈
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Priority to KR1019930007313A priority Critical patent/KR970004437B1/en
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Publication of KR970004437B1 publication Critical patent/KR970004437B1/en

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Abstract

A circuit for protecting a short of a secondary rectifying terminal of a switching power transformer of a television set is disclosed. The circuit comprises a sensor(20) having a rectifying diode(D1) and a capacitor(C1) and for sensing the short of a diode(D2) connected to the secondary terminal of the transformer; a controller(30) having a number of registers(R1-R3) and a transistor(Q1) and for controlling the divided voltage according to the output signal from the sensor(20); and a switch controller having a diode(D3) and a transistor(Q2) and for controlling a relay switch driving circuit(50). Since, thereby, the relay switching driving circuit(50) is shorted in case that the short disorder occurs at the secondary rectifying diode of the transformer, the television set is protected.

Description

텔레비젼의 스위칭 전원 트랜스 2차측 정류단 단락 보호회로TV's switching power supply secondary side rectifier stage short circuit protection circuit

제1도는 본 발명에 따른 SMPS 트랜스와 정류단의 회로도.1 is a circuit diagram of a SMPS transformer and rectifier stage according to the present invention.

제2도는 본 발명의 텔레비젼의 스위칭 전원 트랜스 2차측 정류단 단락 보호 회로도.2 is a switching power supply transformer secondary side rectifier stage short circuit protection circuit of the television of the present invention.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

R1-R3 : 제1-제3저항D1-D3 : 제1-제3다이오드R1-R3: first-third resistor D1-D3: first-third diode

C1 : 제1콘덴서Q1-Q2 : 제1-제2트랜지스터C1: first capacitor Q1-Q2: first to second transistor

10 : SMPS IC20 : 감지부10: SMPS IC20: detector

30 : 제어단40 : 조정단30: control stage 40: adjustment stage

50 : 릴레이 스위치 구동회로50: relay switch driving circuit

본 발명은 TV의 스위칭 전원 트랜스 2차측 정류단에 관한 것으로, 특히 TV의 각 공급 전원단으로 공급하는 스위칭 전원 트랜스 2차측 정류단 다이오드의 단락시 발생되어지는 부품의 파괴나 발화등을 방지할 수 있는 스위칭 전원 트랜스 2차측 정류단 단락 보호회로에 관한 것이다.The present invention relates to a secondary rectifier stage of the switching power supply transformer of a TV, and in particular, it is possible to prevent the destruction or ignition of components generated when a short circuit of the switching power transformer secondary rectifier diode of the TV is supplied to each power supply terminal of the TV. The present invention relates to a switching power supply transformer secondary side rectifier stage short circuit protection circuit.

일반적으로, 제1도는 본 발명에 따른 SMPS(Switching Mode Power Supply) 트랜스와 정류단의 구성을 나타낸 회로도로서, SMPS IC(10)의 파워 구동단(J)에서 하이레벨의 전위가 출력됨과 동시에, 파워 트랜지스터인 제1트랜지스터(Q1)를 도통시킨다.In general, FIG. 1 is a circuit diagram showing a configuration of a switching mode power supply (SMPS) transformer and a rectifying stage according to the present invention, and at the same time a high level potential is output from the power driving stage J of the SMPS IC 10, The first transistor Q1, which is a power transistor, is turned on.

따라서, AC정류 입력단(In)을 통해 입력된 전원은 트랜스(TRANS)의 1차측 권선(P)을 통해 파워 트랜지스터인 제1트랜지스터(Q1)의 콜렉터에서 그 에미터로 흐르는 바, 상기 트랜스(TRANS)의 2차측 권선(S1-S2)에 유기된 전원은 각 TV공급 전원단으로 인가된다.Therefore, the power input through the AC rectifying input terminal In flows from the collector of the first transistor Q1, which is a power transistor, to the emitter through the primary winding P of the transformer TRANS. Power induced in the secondary windings S 1 -S 2 of ) is applied to each TV supply power supply stage.

이때, 트랜스(TRANS)의 2차측 권선의 과전류가 발생할 경우, 전류 및 전압을 감지하여 SMPS IC(10)의 전원회로를 단속하도록 하였으며, 또한, 2차측 정류단 단락시에는 2차 권선의 과전류등을 권선(S')에 의해 단속하고는 있으나, 대전류 라인(LINE)이 아닌 정류단의 문제 발생시에는 트랜스 권선의 전류에 의한 단속이 충분하지 않은 관계로 TV 내부에 사용되는 주요부품의 파괴나 발화등을 막을 수 없는 단점이 있었다.At this time, if the overcurrent of the secondary winding of the transformer occurs, the current and voltage are sensed to interrupt the power supply circuit of the SMPS IC 10. Also, when the secondary rectification stage is shorted, the overcurrent of the secondary winding, etc. Is interrupted by the winding S ', but in case of a problem in the rectifier stage other than the large current line, the interruption or ignition of the main parts used in the TV is not possible due to insufficient interruption by the current of the transformer winding. There was a disadvantage that can not stop the back.

본 발명은 상기의 단점을 해소하기 위해 안출한 것으로, 트랜스 2차측 정류단 단락시 부품의 파괴 및 발화등으로 경제적 손실과 소비자에게 제품에 대한 신뢰성을 확보하는데 그 목적이 있다.The present invention has been made to solve the above drawbacks, and the object of the present invention is to ensure the economic loss and reliability of the product to the consumer due to the destruction and ignition of parts during the short circuit of the transformer secondary side rectifier stage.

이하, 본 발명을 첨부된 도면들을 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제2도는 본 발명에 대한 회로도이다.2 is a circuit diagram of the present invention.

제2도에 도시된 바대로, 본 발명의 텔레비젼의 스위칭 전원 트랜스 2차측 정류단 단락 보호회로는 스위칭 모드 파워 써플라이 트랜스와, 정류단을 구비한 텔레비젼에 있어서, 정류용 다이오드인 제1다이오드(D1)와 평활용 콘덴서인 제1콘덴서(C1)로 구성되어져, 펄스 트랜스의 2차측과 연결된 제2다이오드(D2)의 단락불량시, 이를 (-) 전압으로 감지하고 평활하는 감지수단(20), 제1-제3저항(R1-R3)과 전압 반전용 트랜지스터인 제1트랜지스터(Q1)로 구성되어져, 상기 감지수단(20)에서 출력된 신호에 의해 상기 제1트랜지스터(Q1)를 단속하여 분압전압을 제어하는 제어단(30), 역전류방지용 다이오드인 제3전다이오드(D3)와 제2트랜지스터(Q2)로 구성되어져, 상기 제어단(30)의 동작에 의해 상기 제2트랜지스터(Q2)를 온/오프시켜 소정의 제어신호를 출력하는 조정단(40)으로 구성된다.As shown in FIG. 2, the switching power supply transformer secondary side rectifying stage short circuit protection circuit of the television of the present invention is a switching diode power supply transformer and a first diode D1 which is a rectifying diode in a television having a rectifying stage. ) And a first condenser (C1), which is a smoothing capacitor, for detecting a short circuit of the second diode (D2) connected to the secondary side of the pulse transformer, sensing means (20) and smoothing it with a negative voltage; A first transistor Q1, which is a first to third resistors R1 to R3 and a voltage inversion transistor, intercepts the first transistor Q1 by a signal output from the sensing means 20 to divide the voltage. It is composed of a control stage 30 for controlling voltage, a third electric diode D3 and a second transistor Q2 which are diodes for preventing reverse current, and the second transistor Q2 is operated by the operation of the control terminal 30. To the control stage 40 for outputting a predetermined control signal by turning on / off. It is configured.

이하, 본 발명의 작용, 효과를 상세히 설명한다.Hereinafter, the operation and effect of the present invention will be described in detail.

제1도와 제2도를 관련시켜 본 발명의 일실시예를 설명하면, 펄스 트랜스의 2차측 정류 다이오드인 제2다이오드(D2)가 정상일 경우, SMPS IC(10)의 파워 구동단(J)에서 출력된 하이레벨의 전위는 제1트랜지스터(Q1)를 도통시킴과 동시에, AC정류입력단(In)을 통해 입력된 전원은 트랜스(TRANS)의 1차측 권선을 통해 제1트랜지스터(Q1)의 콜렉터에서 그 에미터로 흐르므로, 상기 제2차측 권선에 유기된 전원은 제2다이오드(D2)와 절점(A)을 경유, 부하측으로 출력된다.Referring to FIG. 1 and FIG. 2, one embodiment of the present invention will be described. When the second diode D2, which is the secondary rectifier diode of the pulse transformer, is normal, the power driving stage J of the SMPS IC 10 is normal. The output high-level potential causes the first transistor Q1 to conduct and at the same time, the power input through the AC rectifying input terminal In is connected to the collector of the first transistor Q1 through the primary winding of the transformer TRANS. Since it flows to the emitter, the power induced in the secondary winding is output to the load side via the second diode D2 and the node A.

이와 반대로, 펄스 트랜스의 2차측 정류 다이오드인 제2다이오드(D2)가 불량일 경우, 제2다이오드(D2)는 단락 상태로 제1다이오드(D1)와 제1콘덴서(C1)로 구성된 감지부(20)에선 (-) 정류된 전압을 감지하고, 제1콘덴서(C1)에선 평활시킨다.On the contrary, when the second diode D2, which is the secondary rectifier diode of the pulse transformer, is defective, the second diode D2 is short-circuited and includes a sensing unit including the first diode D1 and the first capacitor C1. 20, the negative rectified voltage is sensed and the first capacitor C1 is smoothed.

이후, (-) 정류된 전압(로우레벨 전위)은 제1저항(R1)을 통해 반전용 PNP 트랜지스터인 제1트랜지스터(Q1)의 베이스에 인가된 후, 제1트랜지스터(Q1)를 도통시킨다.Subsequently, a negative rectified voltage (low level potential) is applied to the base of the first transistor Q1, which is an inverting PNP transistor, through the first resistor R1 and then conducts the first transistor Q1.

즉, 제1트랜지스터(Q1)의 에미터는 접지(전위 : 영전위)된 상태이므로 공급전원(B1)은 분압저항인 제2-제3저항(R2-R3)에 의해 분압된 후, 제1트랜지스터(Q1)를 동작시킨다.That is, since the emitter of the first transistor Q1 is grounded (potential: zero potential), the power supply B 1 is divided by the second and third resistors R2-R3 which are divided voltages, and then the first The transistor Q1 is operated.

따라서, 조정단(40)의 제2트랜지스터(Q2)의 베이스 전위는 로우레벨의 전위이므로 제2트랜지스터(Q2)를 도통시킨다.Therefore, since the base potential of the second transistor Q2 of the adjusting stage 40 is a low level potential, the second transistor Q2 is turned on.

이와 동시에, 릴레이 구동전압(B2)은 역전류 방지용 다이오드인 제3다이오드(D3)를 경유, 제2트랜지스터(Q2)의 에미터에서 콜렉터로 흐른다.At the same time, the relay driving voltage B 2 flows from the emitter of the second transistor Q2 to the collector via the third diode D3, which is a reverse current prevention diode.

따라서, 릴레이 스위치 구동회로(50)를 오프시켜 펄스 트랜스의 2차측 정류 다이오드의 단락시 더 이상의 불량을 방지한다.Therefore, the relay switch driving circuit 50 is turned off to prevent further failures in the short circuit of the secondary rectifier diode of the pulse transformer.

이와 같이, 본 발명은 펄스 트랜스의 2차측 정류 다이오드 등의 단락 불량시, 릴레이 스위치 구동회로(50)를 단속함으로써, 타부품의 2차 불량을 방지하고, TV셋트의 안전을 도모할 수 있는 효과가 있다.As described above, the present invention is effective in preventing the secondary failure of other parts and preventing the safety of the TV set by interrupting the relay switch driving circuit 50 in case of a short circuit failure of the secondary rectifier diode of the pulse transformer. There is.

Claims (1)

스위칭 모드 파워 써플라이 트랜스와, 정류단을 구비한 텔레비젼에 있어서, 정류용 다이오드인 제1다이오드(D1)와 평활용 콘덴서인 제1콘덴서(C1)로 구성되어져, 펄스 트랜스의 2차측과 연결된 제2다이오드(D2)의 단락 불량시, 이를 (-) 전압으로 감지하고 평활하는 감지수단(20), 제1-제3저항(R1-R3)과 전압 반전용 트랜지스터인 제1트랜지스터(Q1)로 구성되어져, 상기 감지수단(20)에서 출력된 신호에 의해 상기 제1트랜지스터(Q1)를 단속하여 분압전압을 제어하는 제어단(30), 역전류방지용 다이오드인 제3다이오드(D3)와 제2트랜지스터(Q2)로 구성되어져, 상기 제어단(30)의 동작에 의해 상기 제2트랜지스터(Q2)를 온/오프시켜 소정의 제어신호를 출력하는 조정단(40)으로 구성된 텔레비젼의 스위칭 전원 트랜스 2차측 정류단락 보호회로.In a television having a switching mode power supply transformer and a rectifying stage, the first diode D1, which is a rectifying diode, and the first capacitor C1, which is a smoothing capacitor, are connected to the secondary side of the pulse transformer. In case of short-circuit failure of the diode D2, the sensing means 20 detects and smooths the voltage as a negative voltage, and comprises a first to third resistors R1 to R3 and a first transistor Q1 that is a voltage inversion transistor. The control terminal 30 controls the divided voltage by intermitting the first transistor Q1 according to the signal output from the sensing means 20, and the third diode D3 and the second transistor which are reverse current prevention diodes. (2) a switching power supply transformer secondary side of a television comprising an adjusting stage (40) configured to output a predetermined control signal by turning on / off the second transistor (Q2) by the operation of the control stage (30). Rectifier short circuit protection circuit.
KR1019930007313A 1993-04-29 1993-04-29 Switching power trans. secondary rectifying short protection circuit KR970004437B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930007313A KR970004437B1 (en) 1993-04-29 1993-04-29 Switching power trans. secondary rectifying short protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930007313A KR970004437B1 (en) 1993-04-29 1993-04-29 Switching power trans. secondary rectifying short protection circuit

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KR970004437B1 true KR970004437B1 (en) 1997-03-27

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