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KR100259476B1 - Zero Crossing Power Supply Using Resonance - Google Patents

Zero Crossing Power Supply Using Resonance Download PDF

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KR100259476B1
KR100259476B1 KR1019970024576A KR19970024576A KR100259476B1 KR 100259476 B1 KR100259476 B1 KR 100259476B1 KR 1019970024576 A KR1019970024576 A KR 1019970024576A KR 19970024576 A KR19970024576 A KR 19970024576A KR 100259476 B1 KR100259476 B1 KR 100259476B1
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smoothing
power supply
winding
transformer
unit
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KR19990001310A (en
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임성호
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이형도
삼성전기주식회사
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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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1588—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load comprising at least one synchronous rectifier element

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

PURPOSE: A zero crossing power supply using resonance is provided to be capable of realizing the compactification of the power supply and enhancing the efficiency by adding a resonator for reducing the transformer hysteresis loss due to an input voltage. CONSTITUTION: A switching part(Q1) switches an input voltage(Vin) under the control of a controller(10). A transforming part(T1) induces the input voltage from a first winding(N1) to a second winding(N2) and a third winding(N3). A rectifying part(37) comprises a condenser(C1) resonating the output from the second winding(N2) of the transforming part(T1). A smoothing part(39) smoothen the output of the rectifying part(37). A reset part(34) is controlled by the voltage applied to the smoothing part(39) in between the third winding(N3) connected in parallel to the smoothing part and the smoothing part(39).

Description

공진을 이용하여 제로크로싱되는 전원공급장치Zero Crossing Power Supply Using Resonance

제1도는 종래기술에 따른 전원공급장치의 회로도.1 is a circuit diagram of a power supply according to the prior art.

제2도는 종래기술에 따른 또 다른 전원공급장치의 회로도.2 is a circuit diagram of another power supply according to the prior art.

제3도는 본 발명에 따른 공진을 이용하여 제로크로싱되는 전원공급장치 회로도.3 is a power supply circuit diagram which is zero-crossed using resonance in accordance with the present invention.

제4도는 제3도의 각부 파형을 나타낸 도면이다.4 is a view showing the waveform of each part of FIG.

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

10 : 제어부 15 : 리셋부10: control unit 15: reset unit

17, 27, 37 : 정류부 19, 29, 39 : 평활부17, 27, 37: rectifier 19, 29, 39: smoothing

34 : 리셋부34: reset unit

본 발명은 공진을 이용하여 제로크로싱되는 전원공급장치에 관한 것으로서, 더욱 상세하게는 변압기의 입력단에서 전류와 전압이 겹치는 부분이 저감되어서 효율이 향상되고 소형화가 되는 공진을 이용하여 제로크로싱되는 전원공급장치에 관한 것이다.The present invention relates to a power supply device which is zero-crossed by using resonance, and more particularly, a power supply that is zero-crossed by using resonance, which is improved in efficiency and miniaturized by reducing a portion where the current and voltage overlap at the input of the transformer. Relates to a device.

일반적으로 전원공급장치는 입력전압이 스위칭되고 변압기로 인가되며 상기 변압기에 인가된 입력전압이 출력단의 정류부와 평활부를 경유하여 안정된 전원으로 출력됨으로써 후단에 연결된 장치에 전원을 공급하게 된다. 그러나, 상기 전원공급장치를 구성하는 변압기의 히스테리시스 손실에 의해서 상기 스위칭된 입력전압이 정확하게 출력단으로 공급되지 못하기 때문에 전류와 전압이 서로 겹치게 되고 이에 따라서 전원공급장치의 효율이 저감되는 경향이 있다.In general, the power supply device is switched to the input voltage is applied to the transformer, and the input voltage applied to the transformer is output to a stable power supply through the rectifying and smoothing portion of the output stage to supply power to the device connected to the rear stage. However, since the switched input voltage is not accurately supplied to the output terminal due to the hysteresis loss of the transformer constituting the power supply device, current and voltage overlap each other, and thus the power supply device efficiency tends to be reduced.

제1도는 종래 기술에 따른 전원공급장치의 회로도이다.1 is a circuit diagram of a power supply according to the prior art.

종래 기술에 따른 전원공급장치는 제어부(10)의 제어에 의하여 입력전원(Vin)이 스위칭되는 스위칭부(Q1)와, 상기 스위칭부(Q1)에 의하여 스위칭된 입력전원이 1차권선(N1)으로 인가되고 2차권선(N2)으로 유기되는 변압기(T1)와, 상기 변압기(T1)의 1차권선(Ta)과 병렬로 연결되는 저항(R), 콘덴서(C) 및 다이오드(D)로 이루어지는 리셋부(15)와, 상기 변압기(T1)의 2차권선(Tb)에서 출력되는 전원이 정류되는 정류부(17)와, 상기 정류부(17)의 출력이 평활되는 평활부(19)로 구성된다.The power supply apparatus according to the related art has a switching unit Q1 in which an input power Vin is switched under the control of the controller 10, and an input power switched by the switching unit Q1 is a primary winding N1. And a resistor (T), a capacitor (C) and a diode (D) connected in parallel with the transformer (T1) applied to the secondary winding (N2) and in parallel with the primary winding (Ta) of the transformer (T1). A reset section 15, a rectifier 17 for rectifying the power output from the secondary winding Tb of the transformer T1, and a smoothing section 19 for smoothing the output of the rectifier 17. do.

상기와 같이 구성되는 종래 기술에 따른 전원공급장치는 입력전원(Vin)이 제어부(10)의 제어에 의하여 스위칭부(Q1)에서 스위칭되고, 상기 스위칭된 입력전원(Vin)이 변압기(T1)의 1차권선(Ta)으로 인가된다. 그리고, 상기 1차권선(Ta)으로 인가된 스위칭된 입력전원(Vin)은 2차권선(Tb)을 통하여 정류부(17)와 평활부(19)를 통하여 출력된다.In the power supply apparatus according to the related art, which is configured as described above, the input power Vin is switched in the switching unit Q1 under the control of the controller 10, and the switched input power Vin is connected to the transformer T1. It is applied to the primary winding Ta. The switched input power Vin applied to the primary winding Ta is output through the rectifying unit 17 and the smoothing unit 19 through the secondary winding Tb.

또한, 스위칭부(Q1)가 오프되는 경우에 변압기(T1)의 1차권선(Ta)에 인가된 입력전원(Vin)은 저항(R), 콘덴서(C) 및 다이오드(D)로 이루어지는 리셋부(15)에서 소비되어야 상기 스위칭부(Q1)의 양단에 걸리는 전압이 소비되고, 이에 따라서 상기 스위칭부(Q1)가 다시 온되었을 때, 스위칭부(Q1)를 흐르는 전류와 겹치지 않게 된다.In addition, when the switching unit Q1 is turned off, the input power Vin applied to the primary winding Ta of the transformer T1 is a reset unit including a resistor R, a capacitor C, and a diode D. The voltage applied to both ends of the switching unit Q1 must be consumed at 15 so that when the switching unit Q1 is turned on again, it does not overlap with the current flowing through the switching unit Q1.

상기와 같이 스위칭부(Q1)가 온오프로 동작될 때, 상기 스위칭부(Q1)의 양단에 걸리는 전압과, 상기 스위칭부(Q1)를 흐르는 전류가 서로 겹치지 않아야 전력의 소모가 저감되는 소위 소프트(soft) 스위칭이 되는 것이다.When the switching unit Q1 is operated on and off as described above, a so-called software in which power consumption is reduced when the voltage across both ends of the switching unit Q1 and the current flowing through the switching unit Q1 do not overlap each other. (soft) switching.

제2도는 종래 기술에 따른 또 다른 전원공급장치의 회로도이다.2 is a circuit diagram of another power supply according to the prior art.

종래 기술에 따른 또 다른 전원공급장치는 제어부(10)의 제어에 의하여 입력전원(Vin)이 스위칭되는 스위칭부(Q1)와, 상기 스위칭부(Q1)에 의하여 스위칭된 입력전원이 1차권선(N1)으로 인가되고 2차권선(N2)으로 유기되며, 다이오드(D3)가 연결된 3차권선(N3)으로 입력에 대하여 병렬로 연결되어 리셋되는 변압기(T1)와, 상기 변압기(T1)의 2차권선(N2)에서 출력되는 전원이 정류되는 정류부(27)와, 상기 정류부(27)의 출력이 평활되는 평활부(29)로 구성된다.Another power supply apparatus according to the related art includes a switching unit Q1 in which an input power Vin is switched under the control of the controller 10, and an input power switched by the switching unit Q1 is a primary winding ( A transformer T1 applied to N1) and induced into a secondary winding N2 and connected in parallel with an input to a tertiary winding N3 to which a diode D3 is connected and reset in parallel with the input; and two of the transformers T1. The rectifier 27 is a rectifier 27 for rectifying the power output from the winding winding (N2), and the smoothing unit 29 for smoothing the output of the rectifier 27.

상기와 같이 구성되는 종개 기술에 따른 또 다른 전원공급장치는 입력전원(Vin)이 제어부(10)의 제어에 의하여 스위칭부(Q1)에서 스위칭되고, 상기 스위칭된 입력전원(Vin)이 변압기(T1)의 1차권선(N1)으로 인가된다. 그리고, 상기 1차권선(N1)으로 인가된 스위칭된 입력전원(Vin)은 2차권선(N2)을 통하여 정류부(27)와 평활부(29)를 통하여 출력된다.In another power supply apparatus according to the conventional technology, which is configured as described above, the input power Vin is switched in the switching unit Q1 under the control of the controller 10, and the switched input power Vin is transformer T1. Is applied to the primary winding N1. In addition, the switched input power Vin applied to the primary winding N1 is output through the rectifying unit 27 and the smoothing unit 29 through the secondary winding N2.

또한, 스위칭부(Q1)가 오프되는 경우에 변압기(T1)의 1차권선(Ta)에 인가되어 저장된 입력전원(Vin)은 변압기(T1)의 3차권선(N3)과 다이오드(D1)를 통하여 소모되기 때문에 상기 스위칭부(Q1)가 다시 온되었을 때, 스위칭부(Q1)을 흐르는 전류와 겹치지 않게 된다.In addition, when the switching unit Q1 is turned off, the input power Vin applied to and stored in the primary winding Ta of the transformer T1 stores the tertiary winding N3 and the diode D1 of the transformer T1. Since it is consumed through, when the switching unit Q1 is turned on again, it does not overlap with the current flowing through the switching unit Q1.

상기와 같이 스위칭부(Q1)가 온오프로 동작될 때, 상기 스위칭부(Q1)의 양단에 걸리는 전압과, 상기 스위칭부(Q1)를 흐르는 전류가 서로 겹치지 않는 제로크로싱이 되어서 전력의 소모가 저감되는 소위 소프트(Soft) 스위칭이 되는 것이다.When the switching unit Q1 is operated on and off as described above, the voltage across both ends of the switching unit Q1 and the current flowing through the switching unit Q1 become zero crossings that do not overlap each other, thereby consuming power. So-called soft switching is reduced.

그러나, 상기와 같이 소프트 스위칭이 되도록 하기 위하여 종래 기술에 따른 실시예에서의 전원공급장치는 입력전압에 따르는 코어의 히스테리시스 손실을 저감시키기 위하여 상기 변압기를 구성하는 코어의 사이즈가 커져야 하고, 상기 변압기의 1차측 코일에 보유된 전압이 입력전압과 동시에 스위칭부로 인가되기 때문에 입력전압의 약 2배로 되는 전압에 견디도록 상기 스위칭부를 구성하는 트랜지스터의 용량도 커져야 하는 문제점이 있다.However, in order to enable soft switching as described above, the power supply device in the embodiment according to the prior art needs to increase the size of the core constituting the transformer in order to reduce the hysteresis loss of the core according to the input voltage. Since the voltage held in the primary coil is applied to the switching unit at the same time as the input voltage, there is a problem in that the capacitance of the transistor constituting the switching unit must also be increased to withstand a voltage that is approximately twice the input voltage.

따라서 본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출한 것으로 발명의 주된 목적은 인가되는 입력전원에 의한 변압기 히스테리 손실이 저감되도록 공진부를 더 구비함으로써 전원공급장치의 소형화 및 효율이 향상되는 공진을 이용하여 제로크로싱되는 전원공급장치를 제공하기 위함이다.Accordingly, the present invention has been made to solve the above-mentioned conventional problems. The main object of the present invention is to provide a resonator to reduce the transformer hysteresis loss due to the applied input power, thereby miniaturizing the power supply device and improving resonance. To provide a zero-crossing power supply using.

상기 목적을 달성하기 위한 본 발명의 특징은 제어부의 제어에 의하여 입력전원이 스위칭되는 스위칭부와, 상기 입력전원이 1차권선에서 2차권선 및 3차권선으로 유기되는 번압부와, 상기 변압기의 2차권선에서의 출력이 공진되도록 콘덴서가 구비되어서 정류되는 정류부와, 상기 정류부의 출력이 평활되는 평활부 및 상기 평활부에 병렬로 연결되는 변압기의 3차권선과 평활부 사이에서 평활부로 인가되는 전압에 의하여 제어되는 리셋부로 구성됨으로써 공진을 이용하여 제로크로싱되는 전원공급장치를 공급하기 위함이다.A feature of the present invention for achieving the above object is a switching unit for switching the input power by the control of the control unit, the voltage receiving unit is the input power is induced from the primary winding to the secondary winding and the tertiary winding, and the The rectifier is provided with a condenser so that the output from the secondary winding is resonant, and a smoothing portion is applied between the smoothing portion for smoothing the output of the rectifying portion and the tertiary winding of the transformer connected in parallel to the smoothing portion and the smoothing portion. It is intended to supply a zero-crossing power supply using resonance by being composed of a reset unit controlled by a voltage.

이하 첨부도면에 의하여 본 발명에 따른 공진을 이용하여 제로크로싱되는 전원공급장치의 바람직한 일실시예를 상세하게 설명한다.Hereinafter, a preferred embodiment of a zero-crossing power supply using resonance according to the present invention will be described in detail with reference to the accompanying drawings.

제3도는 본 발명에 따른 공진을 이용하여 제로크로싱되는 전원공급장치회로도이고, 제4도는 제3도의 각부 파형을 나타낸 도면이다.FIG. 3 is a circuit diagram of a power supply device which is zero-crossed by using resonance according to the present invention, and FIG. 4 is a view showing waveforms of each part of FIG.

본 발명에 따른 공진을 이용하여 제로크로싱되는 전원공급장치는 제어부(10)의 제어에 의하여 입력전원(Vin)이 스위칭되는 스위칭부(Q1)와, 상기 입력전원이 1차권선(N1)에서 2차권선(N2) 및 3차권선(N3)으로 유기되는 변압부(T1)와, 상기 변압기(T1)의 2차권선(N2)에서의 출력이 공진되도록 콘덴서(C1)가 구비되어서 정류되는 정류부(37)와, 상기 정류부(37)의 출력이 평활되는 평활부(39) 및 상기 평활부(39)에 병렬로 연결되는 변압기(T1)의 3차권선(N3)과 평활부(39) 사이에서 평활부(39)로 인가되는 전압에 의하여 제어되는 리셋부(34)로 구성된다.The zero-crossing power supply apparatus using the resonance according to the present invention includes a switching unit Q1 in which the input power Vin is switched by the control of the controller 10, and the input power is 2 in the primary winding N1. Transformer rectification part T1 induced by the primary winding N2 and the tertiary winding N3, and the rectifying part provided with the rectifier | condenser C1 so that the output from the secondary winding N2 of the said transformer T1 may resonate. (37), between the smoothing portion 39, the output of the rectifying portion 37 is smoothed, and the third winding N3 and the smoothing portion 39 of the transformer T1 connected in parallel to the smoothing portion 39. It consists of a reset unit 34 is controlled by the voltage applied to the smoothing unit 39 in.

상기 리셋부(34)는 출력전압이 발생되는 평활부(39)의 마이너스측에 소스가 연결되고, 드레인은 변압기(T1) 3차권선(N3)을 통하여 평활부(39)의 플러스측에 연결되며, 상기 평활부(39)의 마이너스측에 직렬로 구성된 코일(L1)의 입력단과 게이트 사이에 병렬로 구성된 다이오드(D3)와 저항(R1)이 연결되는 모스 전계효과 트랜지스터인 리셋소자(Q2)로 구성된다.The reset unit 34 has a source connected to the negative side of the smoothing unit 39 where the output voltage is generated, and the drain is connected to the positive side of the smoothing unit 39 through the transformer T1 tertiary winding N3. The reset element Q2 is a MOS field effect transistor connected between a diode D3 and a resistor R1 configured in parallel between an input terminal and a gate of a coil L1 configured in series on the negative side of the smoothing part 39. It consists of.

다음은 상기와 같이 구성된 본 발명의 작동상태에 대해서 설명한다.The following describes the operating state of the present invention configured as described above.

제어부(10)의 제어에 의하여 스위칭부(Q1)에서 입력전원(Vin)이 스위칭되고, 상기 스위칭부(Q1)의 턴-온에 의하여 변압기(T1)의 2차권선(N2), 정류부(37)의 제1다이오드(D1), 평활부(39)의 콘덴서(C2) 및 코일(L1)로 구성되는 폐회로가 형성된다.The input power Vin is switched in the switching unit Q1 under the control of the controller 10, and the secondary winding N2 and the rectifier 37 of the transformer T1 are turned on by the switching unit Q1. A closed circuit composed of the first diode D1 of the C1), the capacitor C2 of the smoothing part 39, and the coil L1 is formed.

상기 폐회로에 의하여 변압기(T1)의 코일에서 발생되는 누설인덕턴스(Leakage Inductance)와 정류부(37)에 구비되는 콘덴서(C1)에 의하여 공진되기 때문에 제4도에서의 t1-t2로 되는 주기동안에서와 같이 변압기(T1)의 입력에 구성된 스위칭부(Q1)의 드레인과 소스 사이에는 역전류(Reverse Current)가 흐르게 된다.Since the closed circuit is resonated by the leakage inductance generated in the coil of the transformer T1 and the condenser C1 provided in the rectifying unit 37, the cycle becomes t1-t2 in FIG. Likewise, a reverse current flows between the drain and the source of the switching unit Q1 configured at the input of the transformer T1.

즉, 상기 역전류에 의하여 스위칭부(Q1)의 전류(id1)와 전압(Vds1)이 서로 겹치지 않도록 되기 때문에 제로크로싱(Zero Crossing)되는 소프트 스위칭이 되는 것이다.That is, since the current id1 and the voltage Vds1 of the switching unit Q1 do not overlap each other due to the reverse current, soft switching is performed by zero crossing.

그리고, 제어부(10)에 의하여 스위칭부(Q1)의 게이트 전압(Vg1)이 발생되고, 상기 게이트 전압(Vg1)에 의하여 스위칭부(Q1)가 턴-온에서 드레인전류(id1)가 흐르게 되며, 이에 따라서 상기와 같이 변압기(T1)의 2차권선(N2), 정류부(37)의 제1다이오드(D1), 평활부(39)의 콘덴서(C2) 및 코일(L1)로 구성되는 폐회로에 의하여 리셋부(34)의 제3다이오드(D3)와 저항(R1)에 의하여 리셋소자(Q2)의 게이트에는 낮은 게이트전압(Vg2)이 인가되어서 상기 리셋소자(Q2)는 턴-오프되며, 상기 형성되는 폐회로에 의하여 출력전압(Vo)이 생성된다.The gate voltage Vg1 of the switching unit Q1 is generated by the controller 10, and the drain current id1 flows when the switching unit Q1 is turned on by the gate voltage Vg1. Accordingly, as described above, the closed circuit includes the secondary winding N2 of the transformer T1, the first diode D1 of the rectifying unit 37, the condenser C2 of the smoothing unit 39, and the coil L1. A low gate voltage Vg2 is applied to the gate of the reset device Q2 by the third diode D3 and the resistor R1 of the reset unit 34 so that the reset device Q2 is turned off. The output voltage Vo is generated by the closed circuit.

한편, 상기 제어부(10)에 의한 게이트 전압(Vg1)이 턴-오프되어서 게이트에 인가되지 않는 경우에는, 스위칭부(Q1)가 턴-오프되어서 드레인과 소스 사이에 드레인 전압(Vds1)만이 걸리게 된다. 그리고, 상기 스위칭부(Q1)의 드레인 전압(Vds1)이 온되는 주기 동안에 평활부(37)의 코일(L1)에 보유된 전원에 의하여 리셋부(34)의 리셋소자(Q2)의 게이트에 높은 게이트전압(Vg2)이 인가되기 때문에 상기 리셋소자(Q2)는 턴-온되어서 출력전압(Vo)이 생성된다.On the other hand, when the gate voltage Vg1 by the controller 10 is turned off and is not applied to the gate, the switching unit Q1 is turned off so that only the drain voltage Vds1 is applied between the drain and the source. . In addition, during the period in which the drain voltage Vds1 of the switching unit Q1 is turned on, the power is held in the coil L1 of the smoothing unit 37 by the power supplied to the gate of the reset element Q2 of the reset unit 34. Since the gate voltage Vg2 is applied, the reset device Q2 is turned on to generate the output voltage Vo.

또한, 스위칭부(Q1)가 턴-오프되는 순간, 평활부(39)의 코일(L1)에 유기되었던 전압에 의하여 리셋소자(Q2)가 턴-온되어 있기때문에 변압기(T1) 2차권선(N2), 정류부(37)의 제1다이오드(D1), 변압기(T1)의 3차권선(N3), 리셋소자(Q2) 및 정류부(37)의 코일(L1)에 의하여 폐회로가 형성되고, 상기 폐회로에 따라서 변압기(T1) 1차권선(N1)에서 역방향으로 흐르는 전류가 리셋되기 때문에 스위칭부(Q1)로 인가되는 전압이 저감되게 되는 것이다.In addition, since the reset device Q2 is turned on by the voltage induced in the coil L1 of the smoothing part 39 at the moment when the switching part Q1 is turned off, the transformer T1 secondary winding ( N2), a closed circuit is formed by the first diode D1 of the rectifier 37, the tertiary winding N3 of the transformer T1, the reset element Q2, and the coil L1 of the rectifier 37. According to the closed circuit, the current flowing in the reverse direction in the primary winding N1 of the transformer T1 is reset, so that the voltage applied to the switching unit Q1 is reduced.

따라서, 상기와 같이 리셋부(34)의 리셋 작용에 의하여 변압기(T1)의 히스테리시스 손실이 저감되기 때문에 전원공급장치의 효율이 향상된다.Therefore, since the hysteresis loss of the transformer T1 is reduced by the reset action of the reset unit 34 as described above, the efficiency of the power supply device is improved.

그리고, 스위칭부(Q1)가 턴-오프되면서, 변압기(T1)의 2차권선(N2)과 정류부(37)의 콘덴서(C1)가 공진되기 때문에 스위칭부(Q1)에 인가되는 드레인 전압(Vds)의 기울기가 제4도에서 t3-t4기간에서와 같이 완만하게 되면서 생성된다. 따라서, 상기 t3-t4 기간동안의 스위칭부(Q1)의 드레인 전압(Vds1)에 의하여 평활부(39)의 코일(L1)에 전압이 유기되고 리셋부(34)의 리셋소자(Q2)의 게이트에 전압이 인가되어 상기 리셋소자(Q2)는 턴-온이 유지되며, 이에 따라서 출력전압(Vo)이 생성된다.As the switching unit Q1 is turned off, the secondary winding N2 of the transformer T1 and the capacitor C1 of the rectifying unit 37 resonate, so that the drain voltage Vds applied to the switching unit Q1. The slope of) is generated as shown in Fig. 4, as smooth as in the period t3-t4. Therefore, the voltage is induced to the coil L1 of the smoothing part 39 by the drain voltage Vds1 of the switching part Q1 during the t3-t4 period, and the gate of the reset element Q2 of the reset part 34 is reset. The voltage is applied to the reset element Q2 to maintain the turn-on, thereby generating the output voltage Vo.

이상에서 상세히 설명한 바와 같이 본 발명에 따른 공진을 이용하여 제로크로싱되는 전원공급장치는 정류부에 구성된 콘덴서와 변압기 2차권선이 공진됨으로써 전류와 전압이 제로크로싱되기 때문에 변압기의 크기가 작아지고, 효율이 향상되는 특징을 지닌 것이다.As described in detail above, the power supply device which is zero-crossed by using the resonance according to the present invention has a small transformer size and efficiency because the current and voltage are zero-crossed by the resonance of the capacitor and the transformer secondary winding formed in the rectifying unit. It has the characteristics to be improved.

본 발명은 상기 실시예에 한정되지 않으며, 많은 변형이 본 발명의 기술적 사상 내에서 당 분야의 통상의 지식을 가진 자에 의하여 가능함은 명백하다.The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

Claims (3)

제어부의 제어에 의하여 입력전원이 스위칭되는 스위칭부; 상기 입력전원이 1차권선에서 2차권선 및 3차권선으로 유기되는 변압부; 상기 변압기의 2차권선에서의 출력이 공진되도록 콘덴서가 구비되어서 정류되는 정류부; 상기 정류부의 출력이 평활되는 평활부; 및 상기 평활부에 병렬로 연결되는 변압기의 3차권선과 평활부 사이에서 평활부로 인가되는 전압에 의하여 제어되는 리셋부로 구성되는 것을 특징으로 하는 공진을 이용하여 제로크로싱되는 전원공급장치.A switching unit to which input power is switched under control of the controller; A transformer unit in which the input power is induced from the primary winding to the secondary winding and the tertiary winding; A rectifier provided with a condenser to rectify the output of the secondary winding of the transformer; A smoothing unit for smoothing the output of the rectifying unit; And a reset part controlled by a voltage applied to the smoothing part between the third winding and the smoothing part of the transformer connected in parallel to the smoothing part. 제1항에 있어서, 상기 리셋부는 출력전압이 발생되는 평활부의 마이너스측에 소스가 연결되고, 드레인은 변압기 3차권선을 통하여 평활부의 플러스측에 연결되며, 상기 평활부의 마이너스측에 직렬로 구성된 코일의 입력단과 게이트 사이에 병렬로 구성된 다이오드와 저항이 연결되는 리셋소자로 구성되는 것을 특징으로 하는 공진을 이용하여 제로크로싱되는 전원공급장치.The coil of claim 1, wherein a source is connected to the negative side of the smoothing part where the output voltage is generated, and a drain is connected to the positive side of the smoothing part through a transformer tertiary winding, and a coil configured in series on the negative side of the smoothing part. A zero-crossing power supply using resonance, comprising a reset element connected in parallel with a diode and a resistor configured in parallel between an input terminal and a gate of the power supply. 제2항에 있어서, 상기 리셋부의 리셋소자는 모스 전계효과 트랜지스터인 것을 특징으로 하는 공진을 이용하여 제로크로싱되는 전원공급장치.3. The power supply device of claim 2, wherein the reset device of the reset unit is a MOS field effect transistor.
KR1019970024576A 1997-06-13 1997-06-13 Zero Crossing Power Supply Using Resonance Expired - Fee Related KR100259476B1 (en)

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