KR860003612Y1 - Power circuit - Google Patents

Power circuit Download PDF

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Publication number
KR860003612Y1
KR860003612Y1 KR2019840010501U KR840010501U KR860003612Y1 KR 860003612 Y1 KR860003612 Y1 KR 860003612Y1 KR 2019840010501 U KR2019840010501 U KR 2019840010501U KR 840010501 U KR840010501 U KR 840010501U KR 860003612 Y1 KR860003612 Y1 KR 860003612Y1
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South Korea
Prior art keywords
triac
voltage
transformer
output
triac switch
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KR2019840010501U
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Korean (ko)
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KR860005367U (en
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이희준
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태일자동제어공업주식회사
이희준
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Priority to KR2019840010501U priority Critical patent/KR860003612Y1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters
    • H02H7/1222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters responsive to abnormalities in the input circuit, e.g. transients in the DC input
    • 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
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from AC or DC
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

내용 없음.No content.

Description

트라이액 스위치를 이용한 무접점 무단락 자동전압 절환장치Solid-State Short-Circuit Automatic Voltage Switching Device Using Triac Switch

첨부된 도면은 본 고안 무접점 무단락 자동전압 절환장치의 회로도.The accompanying drawings are circuit diagrams of a subjectless contactless short-circuit automatic voltage switching device.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

가 : 전압자동판별부 1,2,...N : 트라이액 스위치부A: Voltage automatic discriminating part 1,2, ... N: Triac switch part

TR1, TR2,... TRn : 트라이액 Rl4, R24,...Rn4: 과전류차단용저항TR 1 , TR 2 , ... TRn: Triac R l4 , R 24 , ... Rn 4 : Resistance for overcurrent breaking

7 : 변압기7: transformer

본 고안은 입력전압이 변동되었을 경우에 이를 공지의 전압자동판별부로 검출하여 트라이액 스위치부를 위상 절환시킴으로써 출력전압이 일정범위를 자동으로 유지되게 한 트라이액 스위치를 이용한 무접점 무단락 자동전압 절환장치에 관한 것으로, 특히 트라이액 스위치부가 절환될 경우에 발생되는 과전류로부터 트라이액을 보호하여 트라이액 스위치부가 완벽한 절환스위치 역할을 할 수 있게한 트라이액 스위치를 이용한 무접점 무단락 자동전압 절환장치에 관한 것이다.According to the present invention, when the input voltage is changed, it is detected by a well-known voltage automatic discriminating unit and phase-changed the triac switch unit so that the output voltage is automatically maintained in a certain range. In particular, the present invention relates to a contactless contactless automatic voltage switching device using a triac switch, which protects the triac from an overcurrent generated when the triac switch is switched, thereby allowing the triac switch to function as a complete switching switch. will be.

종래에도 입력전압이 변동되었을 경우에 이를 전압 자동판별로 검출하여 트라이액 스위치부를 위상절환시킴으로써 출력전압이 일정범위를 자동으로 유지되게 하였으나, 이러한 종래의 장치에 있어서는 트라이액 스위치부가 절환될 경우에 교류전원의 반주기동안 2개의 트라이액이 동시에 온되면, 2개의 트라이액이 출력측 변압기를 통해 폐회로를 유지하게 되므로 2개의 트라이액에는 출력측 변압기를 통한 과전류가 흐르게되고, 이에따라 트라이액이 과전류에 견디지 못할 경우에는 트라이액이 파괴되어 트라이액 스위치부가 절환스위치 기능을 상실하게 되고, 또한 이러한 점을 감안하여 전압자동 판별부로서 온되어 있는 하나의 트라이액 스위치부를 완전히 오프시킨 후에 다른 트라이액 스위치 부를 온시킴으로써 과전류로부터 트라이액을 보호할 수 있었으나, 이러한 경우에는 교류전원의 반주기동안, 즉 교류전원의 부(-) 전압이 인가되는 반주기 동안에 다른 트라이액의 게이트에 게이트 전류가 인가되어도 이 반주기 동안은 트라이액이 오프된 상태를 유지하여 출력측 변압기에는 입력전압이 인가되지 못하므로 부하에 공급전압이 인가되어 부하가 오동작되는 결점이 있었다.Conventionally, when the input voltage fluctuates, the voltage is detected for each automatic plate to phase-change the triac switch unit so that the output voltage is automatically maintained in a certain range. However, in the conventional apparatus, when the triac switch unit is switched, the AC If two triacs are on at the same time during the power cycle, the two triacs maintain a closed circuit through the output side transformer, so that the two triacs have an overcurrent flowing through the output side transformer, so that the triac cannot withstand the overcurrent. The triac is destroyed so that the triac switch loses its switching switch function. In addition, the triac switch unit, which is turned on as the voltage automatic discrimination unit, is completely turned off, and then the other triac switch unit is turned on. Protect triacs from However, in this case, even if a gate current is applied to the gate of another triac during the half cycle of the alternating current power source, that is, during the half cycle where the negative voltage of the alternating current power is applied, the triac is kept off during this half cycle. Since the input voltage was not applied to the output side transformer, the supply voltage was applied to the load, resulting in a malfunction of the load.

본 고안은 이러한 점을 감안하여 입력전압의 변동을 자동전압 판별부로 검출하여 트라이액 스위치부를 위상 절환시킴으로써 출력측 변압기의 출력전압이 일정범위를 유지되게 한 자동전압 절환장치에 있어서, 각 트라이액 스위치부의 출력측과 출력측 변압기 사이에 과전류차단용 저항을 접촉하여 트라이액 스위치부의 절환시에 두개의 트라이액 스위치부가 교류전원의 반주기동안 동시에 온되어 두개의 트라이액이 출력측 변압기를 통해 폐회로를 유지하여도, 출력측 변압기를 통한 전류는 과전류 차단용 저항에서 대부분 차단되어 트라이액에는 과전류가 흐르지 못하게 안출한 것으로, 이를 첨부된 도면에 의하여 보다 상세히 설명하면 다음과 같다.In view of the above, the present invention detects a change in the input voltage with an automatic voltage discriminating unit and phase-changes the triac switch unit so that the output voltage of the output transformer is maintained in a certain range. Even though the two triac switch units are simultaneously turned on during the half cycle of the AC power supply when the triac switch unit is switched by contacting the overcurrent blocking resistor between the output side transformer and the output side transformer, even though the two triacs maintain a closed circuit through the output side transformer, The current through the transformer is largely cut off from the resistance for blocking the overcurrent, so that the overcurrent does not flow in the triac, which will be described in more detail with reference to the accompanying drawings.

첨부된 도면에 도시한 바와같이, 입력전압(AC)의 변동을 공지의 전압자동판별부(가)로 검출한 후 저항(R11), (R2l),... (Rnl)을 통해 트라이액 스위치부(1), (2),...(N)의 트라이액 (TR1), (TR2),... (TRn)의 게이트에 게이트 전류를 인가함으로써 트라이액 스위치부(1),(2),... (N)가 위상 절환되어 변압기(T)의 출력전압이 일정범위를 유지하는 자동전압 절환장치에 있어서, 트라이액 스위치부(1), (2),...(N)의 각 출력측과 변압기(T)의 1차권선(T1)의 각 텝 (tl),(t2),... (tn)사이에 과전류 차단동 저항(R14), (R24),..., (Rn4)을 각각 접속하여 구성한다.As shown in the accompanying drawings, a change in the input voltage (AC) is detected by a known automatic voltage discriminator (a) and then through the resistors (R 11 ), (R 2l ), ... (Rn l ). The triac switch unit 1 is applied by applying a gate current to the gates of the triacs TR 1 , TR 2 , TRn of the triac switch units 1 , 2 ,. 1), (2), ... In an automatic voltage switching device in which (N) is phase switched so that the output voltage of the transformer (T) maintains a constant range, a triac switch unit (1), (2),. ..Over current breaking copper resistance (R 14 ) between each output side of (N) and each tap (t l ), (t 2 ), ... (tn) of primary winding (T 1 ) of transformer (T) , (R 24 ), ..., (Rn 4 ) are connected respectively.

여기서 전압자동 판별부(가)는 입력전압(AC)의 크기를 판별하여, 입력전압(AC)이 가장 높을때에는 그의 출력단자(a1)에 고전위 신호를 출력하고, 이보다 조금 낮을때에는 그의 출력단자(a2)에 고전위 신호를 출력하며, 이와같은 방법으로 입력전압(AC)이 낮아짐에 따라 그의 출력단자(al), (a2),... (an)에 순차적으로 고전위 신호가 출력되는 공지의 전압자동 판별부이다. 그리고 트라이액 스위치부(1), (2),... (N)의 트라이액 (TR1), (TR2),... (TRn)의 게이트에 병렬접속된 저항(R12), (R22),... (Rn2) 및 콘덴서 (C11) , (C2l),... (Cnl)는 트라이액(TR1), (TR2),... (TRn)의 게이트에 게이트 전류가 인가될때 발생되는 써지전압을 흡수하기 위한것이고, 트라이액 (TR1), (TR2),...(TRn)의 양단사이에 접속된 콘덴서 (Cl2), (C22),... (Cn2) 및 저항 (R13), (R23),..., (Rn3)은 트라이액 (TR1), (TR2),..., (TRn) 동작시 발생 되는 써지전압을 흡수하기 위한 것이며, 변압기 (T)의 2차권선(T2)에 접속된(나)는 부하이다.Here, the voltage automatic determination unit (A) determines the magnitude of the input voltage (AC), and outputs a high potential signal to its output terminal (a 1 ) when the input voltage (AC) is the highest, and its output when it is slightly lower than this. A high potential signal is output to the terminal (a 2 ), and in this way, as the input voltage (AC) is lowered, the high potential is sequentially applied to its output terminals (a l ), (a 2 ), ... (an). It is a known voltage automatic discrimination unit for outputting a signal. And a resistor (R 12 ) connected in parallel to the gates of the triacs (TR 1 ), (TR 2 ), (TRn) of the triac switch unit (1), (2), ... (N), (R 22 ), ... (Rn 2 ) and condensers (C 11 ), (C 2l ), ... (Cn l ) are triacs (TR 1 ), (TR 2 ), ... (TRn) Condensers (C l2 ) and (C) connected between both ends of the triacs (TR 1 ), (TR 2 ), ... (TRn) to absorb the surge voltage generated when a gate current is applied to the gate of 22 ), ... (Cn 2 ) and resistances (R 13 ), (R 23 ), ..., (Rn 3 ) are triacs (TR 1 ), (TR 2 ), ..., (TRn) It is for absorbing the surge voltage generated during operation, and it is the load connected to the secondary winding T 2 of the transformer T.

이와같이 구성된 본 고안은 입력전압(AC)이 공급되면, 공지의 전압자동판별부(가)에서 입력전압(AC)의 크기를 판별하여 그의 출력단자(a1), (a2),... (an)중 하나에 고전위 신호를 출력한다. 이때 전압자동판별부(가)의 출력단자(a1)에서 고전위 신호가 출력되었다고 가정하면, 이 고전위 신호는 저항(R11)을 통하여 트라이액 스위치(1)의 트라이액(TR1)에 게이트 전류를 인가하므로 트라이액(TR1)은 온되고, 이에따라 입력전압(AC)은 트라이액 스위치부(1) 및 과전류 차단용저항(Rl4)을 통해 변압기(T)의 1차권선(T1)의 탭(t1-t0)에 인가되므로 그의 2차권선(T2)에는 일정전압이 유기되어 부하(나)에 공급된다.According to the present invention configured as described above, when the input voltage AC is supplied, a known voltage automatic judging unit determines the magnitude of the input voltage AC and output terminals a 1 , a 2 ... Output a high potential signal to one of (an). In this case, assuming that a high potential signal is output from the output terminal a 1 of the voltage automatic discriminating unit a, the high potential signal is transmitted through the resistor R 11 to the triac TR 1 of the triac switch 1 . Since the triac TR 1 is turned on, the input voltage AC is turned on by the primary winding of the transformer T through the triac switch unit 1 and the overcurrent blocking resistor R l4 . therefore it applied to the tab (t 1 -t 0) of t 1) its secondary winding (t 2), the constant voltage is organic is supplied to the load (B).

이와같은 상태에서 입력전압(AC)이 조금 낮아지면 자동전압 판별부(가)의 출력단자(a1)에 출력되는 고전위신호가 차단되면서 출력단자(a2)에만 고전위 신호가 출력되므로, 트라이액 스위치부(1)의 트라이액 (TR1)은 오프되고, 트라이액 스위치부(2)의 트라이액(TR2)은 온된다. 이에따라 입력전압(AC)은 트라이액 스위치부(2) 및 과전류 차단용저항(R24)을 통하여 변압기 (T)의 1차권선(T1)의 텝(t2-t0)에 인가되므로 그의 2차권선(T2)에는 입력전압(AC)이 낮아진만큼 승압되어 [1차권선(T1)의 탭(t2), (t0)간의 권선수가 탭(tl), (t0)간의 권선수보다 줄어들었으므로] 부하(나)에 인가된다.In this state, when the input voltage AC is slightly lowered, since the high potential signal outputted to the output terminal a 1 of the automatic voltage discriminating unit A is cut off, the high potential signal is output only to the output terminal a 2 . The triac TR 1 of the triac switch unit 1 is turned off, and the triac TR 2 of the triac switch unit 2 is turned on. Accordingly, the input voltage AC is applied to the step t 2- t 0 of the primary winding T 1 of the transformer T through the triac switch unit 2 and the overcurrent blocking resistor R 24 . The secondary winding T2 is stepped up as the input voltage AC is lowered, so that the number of turns between the taps t 2 and t 0 of the primary winding T 1 is between the taps t l and t 0 . Since it is less than the number of turns] is applied to the load (b).

그런데 자동전압 판별부(가)의 출력단자(a1)에 출력되는 고전위 신호가 차단되면서 출력단자(a2)에 고전위신호가 출력되는 순간에 트라이액(TR1),(TR2)의 애노드에 정(+)의 입력전압(AC)이 인가되고 있으면, 이 정(+)의 반주기 동안은 트라이액 (TR1)이 온된 상태를 유지하다가 부(-)의 입력전압(AC)이 인가되는 순간에 오프되므로, 이 반주기 동안은 트라이액(TR1)(TR2)이 동시에 온된다. 이에따라 트라이액(TR1)(TR2)은 과전류 차단용저항(Rl4) 및 변압기(Tl)의 1차권선(T1)의 탭(tl),(t2), 과전류 차단용저항(R24)을 통해 폐회로를 형성하지만, 1차권선(T1)의 탭(tl),(t2)간을 흐른 전류는 과전류 차단용저항(R14), (R24)에서 방열되면서 차단되므로 트라이액(TR1), (TR2)에는 과전류가 인가되지 않게 된다.However, when the high potential signal is output to the output terminal a 2 while the high voltage signal output to the output terminal a1 of the automatic voltage discriminating unit is blocked, the triacs TR 1 and TR 2 If a positive input voltage (AC) is applied to the anode, the triac (TR 1 ) remains on for a half period of the positive (+), and a negative input voltage (AC) is applied. At the moment, the triac TR 1 (TR 2 ) is turned on at the same time during this half cycle. Accordingly, the triac (TR 1 ) (TR 2 ) is an overcurrent blocking resistor (R l4 ) and a tap (t l ), (t 2 ) of the primary winding (T 1 ) of the transformer (T l ), and an overcurrent blocking resistor. Although a closed circuit is formed through (R 24 ), current flowing between the tabs (t 1 ) and (t 2 ) of the primary winding (T 1 ) is radiated by the overcurrent blocking resistors (R 14 ) and (R 24 ). Since the triac TR 1 and TR 2 are not blocked, an overcurrent is not applied.

이와같은 동작은 트라이액(TR1), (TR2)의 순간 최대허용 전류값(IΔt)보다 작은 전류가 상기 폐회로에흐르게 과전류 차단용저항(Rl4), (R24)의 (값(R)을 설정함으로써 가능하다. 즉 트라이액 (TR1), (TR2)의 근간최대 허용전류값(IΔt)을 50 [A] 1차권선(T1)의 탭(tl), (t2)간의 전압(Vtl,t2)을 20 [V]라고 가정하면, 과전류 차단용저항(R14), (R24),의 값(R)은R=0.2(Ω)이 되므로, 과전류 차단용저항(R14), (R24)의 값(R)을 0.2(Ω) 이상으로 설정함으로써 트라이액 (TR1), (TR2)이 동시에 온되었을 경우에도 1차권선(T1)의 탭(tl),(t2)간을 흐른 순간전류(IΔt)는 과전류 차단용저항(Rl4),(R24)에서 방열(PI2Δt ×Δ R식에 의해)되므로 트라이액(TR1), (TR2)을 충분히 보호할 수 있게 된다. 그런데 과전류 차단용저항(R14), (R24)의 값(R)이 너무 크면 전력손실이 크고, 열이 많이 발생되로, 이로 인해 전압이 낮아져 부하(나)의 성능에 영향을 미치게되고, 과전류 차단용저항(Rl4), (R24)의 값(R)이 너무 작으면 트라이액 (TR1), (TR2)이 경화현상을 일으켜 수명이 단축되고, 심한 경우에는 트라이액 (TR1), (TR2)이 파괴되므로 이와같은 점을 감안하여 과전류 차단용저항(Rl4), (R24)의 값(R)을 적절히 설정할 필요가 있다. 입력전압(AC)이 다시 변동되면, 상기에서와 같이 트라이액 스위치부(1), (2),... (N)가 절환되어 변압기(T)의 2차권선(T2)에는 일정범위의 출력전압을 항상 유지하게 된다.This operation is such that the current smaller than the instantaneous maximum allowable current value IΔt of the triacs TR 1 and TR 2 flows through the closed circuit in the overcurrent blocking resistors R l4 and R 24 . By setting the maximum maximum allowable current value (IΔt) of the triacs (TR 1 ) and (TR 2 ) to the taps (t l ) and (t 2 ) of the 50 [A] primary winding (T 1 ). Assuming that the voltage (Vt l , t 2 ) between) is 20 [V], the values (R) of the overcurrent blocking resistors (R 14 ), (R 24 ), Since R = 0.2 (Ω), the triacs (TR 1 ) and (TR 2 ) are turned on at the same time by setting the values (R) of the overcurrent blocking resistors (R 14 ) and (R 24 ) to 0.2 (Ω) or more. Even if it is, the instantaneous current (IΔt) flowing between the tabs (t l ) and (t 2 ) of the primary winding (T 1 ) is radiated by the overcurrent blocking resistors (R l4 ) and (R 24 ) (PI 2 Δt × (By ΔR), the triac (TR 1 ) and (TR 2 ) can be sufficiently protected. However, if the value (R) of the overcurrent blocking resistors (R 14 ) and (R 24 ) is too large, the power loss is large and heat is generated. As a result, the voltage is lowered, which affects the performance of the load (I). If the value (R) of the overcurrent breaking resistance (R l4 ) and (R 24 ) is too small, the triac (TR 1 ) and (TR 2 ) will harden and shorten the life.In severe cases, the triac (TR) 1 ) and (TR 2 ) are destroyed, and in view of such a point, it is necessary to appropriately set the values R of the overcurrent blocking resistors R l4 and R 24 . When the input voltage AC is changed again, the triac switch parts 1, 2, ... N are switched as described above, and the secondary winding T 2 of the transformer T is in a certain range. The output voltage of is always maintained.

이상에서와 같이 본 고안은 트라이액 스위치부의 절환시에 두개의 트라이액스위치부가 동시에 온되어도 트라이액 스위치부에는 과전류가 인가되지 않아 트라이액을 보호할 수 있으므로, 트라이액 스위치 부로서 완벽한 절환스위치 기능을 수행할 수 있고, 트라이액의 수명이 연장되어 제품의 신뢰도가 향상되는 이점이있다.As described above, the present invention protects the triac because an overcurrent is not applied to the triac switch unit even when two triac switch units are turned on at the same time when the triac switch unit is switched. There is an advantage that can be performed, and the life of the triac is extended to improve the reliability of the product.

Claims (1)

입력전압(AC)의 변동을 공지의 전압자동 판별부(가)로 검출하여 트라이액 스위치부(1), (2),... (N)의 트라이액 (TR1), (TR2),... (TRn)에 게이트 전류를 인가함으로써 트라이액 스위치부(1), (2),... (N)가 위상 절환되어 변압기(T)의 출력전압이 일정범위를 유지하는 자동전압 절환장치에 있어서, 트라이액 스위치부(1), (2),...(N)의 각 출력측과 변압기 (T)의 1차권선(T1)의 각 탭 (tl), (t2),... (In) 사이에 과전류 차단용저항(R14), (R24),...(Rn4)을 각각 접속하여 구성함을 특징으로 하는 트라이액 스위치를 이용한 무접점 무단락 자동전압 절환장치.By detecting a variation in the input voltage (AC) voltage to the automatic discrimination part (a) of the known triac switching unit (1), (2), the triac (TR 1) and (TR 2) in the (N) By applying a gate current to TRn, the triac switch sections 1, 2, and N are phase-shifted so that the output voltage of transformer T maintains a constant range. In the switching device, each output side of the triac switch unit (1), (2), ... (N) and each tab (t l ), (t 2 ) of the primary winding (T1) of the transformer (T) Contactless and no short circuit automatic using triac switch, characterized by connecting over current blocking resistor (R 14 ), (R 24 ), ... (Rn 4 ) between Voltage switching device.
KR2019840010501U 1984-10-24 1984-10-24 Power circuit KR860003612Y1 (en)

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KR860003612Y1 true KR860003612Y1 (en) 1986-12-15

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