KR0139543Y1 - A variable circuit for oscillating frequency of switching mode power supply - Google Patents

A variable circuit for oscillating frequency of switching mode power supply Download PDF

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Publication number
KR0139543Y1
KR0139543Y1 KR2019960012550U KR19960012550U KR0139543Y1 KR 0139543 Y1 KR0139543 Y1 KR 0139543Y1 KR 2019960012550 U KR2019960012550 U KR 2019960012550U KR 19960012550 U KR19960012550 U KR 19960012550U KR 0139543 Y1 KR0139543 Y1 KR 0139543Y1
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South Korea
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power
integrated device
oscillation
power supply
pwm integrated
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KR2019960012550U
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Korean (ko)
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KR970064359U (en
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이수찬
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김광호
삼성전자주식회사
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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
    • H02M3/338—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 in a self-oscillating arrangement
    • H02M3/3385—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 in a self-oscillating arrangement with automatic control of output voltage or current
    • 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
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • H02M1/0019—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being load current fluctuations

Abstract

본 고안은 전원 스위치를 온하는 초기에는 PWM용 집적소자의 발진 주파수를 낮게 하고, 소정의 시간이 경과될 경우에 원래의 발진 주파수로 복귀시키는 것이다.The present invention is to lower the oscillation frequency of the PWM integrated device at the initial stage of turning on the power switch, and to return to the original oscillation frequency when a predetermined time elapses.

본 고안은 전원 스위치를 온하는 초기에 정류된 전원을 PWM용 집적소자의 전원단자에 인가하여 PWM용 집적소자의 기준 전압단자에서 출력되는 기준전압을 PWM용 집적소자의 발진단자에 인가하고, PWM용 집적소자가 정상으로 동작하여 스위칭용 트랜스의 이차코일로 전원이 유도될 경우에 그 유도되는 전원으로 PWM용 집적소자의 발진단자에 높은 전압을 인가하여 발진 주파수를 증가시킴으로써 전원 스위치를 온하는 초기에 발생되는 피크전압의 레벨이 낮아 피크전압으로 인한 부품의 손상을 방지하고, 정상으로 동작할 경우에는 PWM용 집적소자가 높은 주파수로 발진하게 하여 회로의 각 부위에 정상으로 동작전원을 공급한다.The present invention applies the rectified power to the power supply terminal of the PWM integrated device at the initial stage when the power switch is turned on, and applies the reference voltage output from the reference voltage terminal of the PWM integrated device to the oscillation terminal of the PWM integrated device. When the integrated device operates normally and the power is induced to the secondary coil of the switching transformer, the initial power source is turned on by applying a high voltage to the oscillation terminal of the PWM integrated device to increase the oscillation frequency. Low peak voltage level prevents damage to components due to peak voltage. When operating normally, PWM integrated device oscillates at high frequency and supplies power to each part of the circuit.

Description

스위칭 모드 전원 공급장치의 발진 주파수 가변회로Oscillation Frequency Variable Circuit of Switching Mode Power Supply

제1도는 종래의 스위칭 모드 전원 공급장치에 사용되는 스너버 회로도.1 is a snubber circuit diagram used in a conventional switched mode power supply.

제2도는 본 고안의 발진 주파수 가변회로도.2 is an oscillation frequency variable circuit diagram of the present invention.

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

11 : 초기전원 공급부 12 : PWM용 집적소자11 initial power supply 12 PWM integrated device

13 : 제1발진전압 공급부 14 : 동작전원 공급부13: first oscillation voltage supply unit 14: operating power supply unit

15 : 제2발진전압 공급부 Vref : 기준전압 단자15: second oscillation voltage supply unit Vref: reference voltage terminal

Osc : 발진단자 SWT : 스위칭 트랜스Osc: Oscillation terminal SWT: Switching transformer

Vcc : 전원단자Vcc: Power Terminal

본 고안은 부하의 사용 전력에 따라 안정된 동작 전원을 공급하는 스위칭 모드전원공급(Switching Mode Power Supply : 이하, 'SMPS'라고 약칭함)장치에 있어서, PWM용(Pulse Width Modulation) 신호를 발생하는 PWM용 집적소자의 발진 주파수를 가변시켜 전원부의 효율을 향상시키는 스위칭 모드 전원 공급장치의 발진 주파수 가변회로에 관한 것이다.The present invention is a PWM for generating a pulse width modulation signal in a switching mode power supply (hereinafter, abbreviated as 'SMPS') device for supplying a stable operating power according to the power used by a load. An oscillation frequency variable circuit of a switching mode power supply for improving the efficiency of a power supply unit by varying an oscillation frequency of an integrated device.

SMPS장치는 입력되는 교류전원을 직류전원으로 변환하고, 이 직류전원을 PWM용 집적소자의 출력신호에 따라 스위칭시켜 부하에 동작전원을 공급함과 아울러 부하의 소모 전력에 따라 PWM용 집적소자의 스위칭 주기를 조절하여 부하에는 소모 전력에 따른 안정된 동작 전원이 공급되게 하고 있다.The SMPS device converts the input AC power into DC power, and switches the DC power according to the output signal of the PWM integrated device to supply the operating power to the load and the switching cycle of the PWM integrated device according to the power consumption of the load. By adjusting, the load is supplied with stable operating power according to the power consumption.

이러한 SMPS장치의 효율을 향상시키기 위한 하나의 방편으로 PWM용 집적소자의 발진 주파수를 높이면 된다.One way to improve the efficiency of the SMPS device is to increase the oscillation frequency of the PWM integrated device.

그러나 PWM용 집적소자의 발진 주파수를 높이면, 상대적으로 전원을 온 및 오프할 경우에 피크(peak) 전압이 높게 되고, 이 피크 전압에 의하여 정류소자가 손상된다.However, when the oscillation frequency of the PWM integrated device is increased, the peak voltage becomes high when the power supply is turned on and off relatively, and the rectifier device is damaged by the peak voltage.

그러므로 종래에는 제1도에 도시된 바와 같이 트랜스(T1)의 이차코일에 연결되는 정류용 다이오드(D1)에 직렬 접속된 저항(R1) 및 콘덴서(C1)를 병렬 접속하여 스너버(snubber) 회로를 구성하고, 정류용 다이오드(D1) 및 콘덴서(C1)의 접속점은 접지 콘덴서(C2) 및 저항(R2)을 통해 접지 콘덴서(C3)에 접속하였다.Therefore, in the related art, a snubber is connected in parallel by connecting a resistor R 1 and a capacitor C 1 connected in series to a rectifying diode D 1 connected to a secondary coil of a transformer T 1 , as shown in FIG. 1. A (snubber) circuit was constructed, and the connection point of the rectifier diode D 1 and the capacitor C 1 was connected to the ground capacitor C 3 through the ground capacitor C 2 and the resistor R 2 .

이와 같이 구성된 종래의 회로는 전원 트랜스(T1)의 이차코일로 유도되는 전원이 정류용 다이오드(D1)를 통해 정류되고, 정류된 전원은 접지 콘덴서(C2), 저항(R2) 및 접지 콘덴서(C3)에 의해 평활되어 직류전원을 출력하게 된다.In the conventional circuit configured as described above, the power induced by the secondary coil of the power transformer T 1 is rectified through the rectifying diode D 1 , and the rectified power is the ground capacitor C 2 , the resistor R 2 , and It is smoothed by the ground capacitor C 3 to output the DC power.

이러한 종래의 회로는 정류용 다이오드(D1)의 양단에 직렬 접속된 저항(R1) 및 콘덴서(C1)를 접속하여 피크전압을 줄이고, 정류용 다이오드(D1)가 손상되지 않도록 하고 있다.Such conventional circuit is not damaging access by reducing the peak voltage, the rectifying diode (D 1) for a series connected resistor (R 1) and a capacitor (C 1) at both ends of the rectifying diode (D 1) for .

그러나 스너버 회로의 저항(R1) 및 콘덴서(C1)는 그 크기가 커 회로기판의 많은 면적으로 차지하므로 회로기판의 설계가 어렵고, 또한 저항(R1) 및 콘덴서(C1)의 오차, 발열 및 규격 허용 전류 및 전압 등에 의해 많은 제약을 받으므로 피크전압을 효과적으로 감쇄시키지 못하는 등의 여러가지 문제점이 있었다.However, since the resistance (R 1 ) and the capacitor (C 1 ) of the snubber circuit are large and occupy a large area of the circuit board, the design of the circuit board is difficult, and the error of the resistor (R 1 ) and the capacitor (C 1 ) is also difficult. Since there are many limitations due to heat generation and specification allowable current and voltage, there are various problems such as not effectively attenuating the peak voltage.

그러므로 본 고안의 목적은 전원 스위치를 온하는 초기에는 PWM용 집적소자의 발진 주파수를 낮게 하고, 소정의 시간이 경과될 경우에 원래의 발진 주파수로 복귀시키는 스위칭 모드 전원 공급장치의 발진 주파수 가변회로를 제공하는데 있다.Therefore, an object of the present invention is to reduce the oscillation frequency of the PWM integrated device at the initial stage of turning on the power switch, and to change the oscillation frequency variable circuit of the switching mode power supply to return to the original oscillation frequency when a predetermined time elapses. To provide.

이러한 목적을 달성하기 위한 본 고안의 발진 주파수 가변회로는 전원 스위치를 온하는 초기에 정류된 전원을 PWM용 집적소자의 전원단자에 인가하여 PWM용 집적소자의 기준 전압단자에서 출력되는 기준전압을 PWM용 집적소자의 발진단자에 인가하고, PWM용 집적소자가 정상으로 동작하여 스위칭용 트랜스의 이차코일로 전원이 유도될 경우에 그 유도되는 전원으로 PWM용 집적소자의 발진단자에 높은 전압을 인가하여 발진 주파수를 증가시키는 것을 특징으로 한다.The oscillation frequency variable circuit of the present invention for achieving the above object is applied to the power terminal of the PWM integrated device by applying the rectified power at the initial stage to turn on the power switch to PWM the reference voltage output from the reference voltage terminal of the PWM integrated device When the power supply is induced to the secondary coil of the switching transformer because the PWM integrated device operates normally and a high voltage is applied to the oscillation terminal of the PWM integrated device as the induced power supply. It is characterized by increasing the oscillation frequency.

이하, 첨부된 제2도의 도면을 참조하여 본 고안의 스위칭 모드 전원 공급 장치의 발진 주파수 가변회로를 상세히 설명한다.Hereinafter, the oscillation frequency variable circuit of the switching mode power supply of the present invention will be described in detail with reference to the accompanying drawings of FIG. 2.

제2도는 본 고안의 발진 주파수 가변회로도이다. 이에 도시된 바와 같이, 전원 스위치(도면에 도시되지 않았음)를 온하는 초기에 동작 전원을 공급하는 브리지 다이오드(BD), 저항(R11,R12) 및 콘덴서(C11,C12)로 된 초기전원 공급부(11)와, 상기 초기전원 공급부(11)의 출력전원으로 초기 동작하여 PWM 발진하면서 전원 스위칭 동작을 제어하는 PWM용 집적소자(12)와, 상기 PWM용 집적소자(12)의 발진단자(Osc)에 발진전압으로 인가하는 저항(R13) 및 콘덴서(C13)로 된 제1발진전압 공급부(13), PWM용 집적소자(12)의 출력신호에 따른 스위칭 소자(도면에 도시되지 않았음)의 제어에 따라 전원이 유도되는 스위칭 트랜스(SWT)와, 상기 스위칭 트랜스(SWT)로 유도된 전원으로 상기 PWM용 집적소자(12)의 전원단자(Vcc)에 동작전원을 공급하는 다이오드(D11), 저항(R14) 및 콘덴서(C14)로 된 동작전원 공급부(14)와, 상기 스위칭 트랜스(SWT)로 유도된 전원으로 상기 PWM용 집적소자(12)의 발진단자(Osc)에 상기 제1발진전압 공급부(13)보다 높은 레벨의 발진전압을 인가하는 다이오드(D12,D13) 저항(R15~R17) 및 콘덴서(C15)로 된 제2발진전압 공급부(15)로 구성하였다.2 is an oscillation frequency variable circuit diagram of the present invention. As shown therein, a bridge diode (BD), resistors (R 11 , R 12 ) and capacitors (C 11 , C 12 ) that initially supply operating power to turn on the power switch (not shown in the figure). The initial power supply unit 11, the PWM integrated device 12 for controlling the power switching operation while initially oscillating and outputting the PWM by the output power of the initial power supply 11, and the PWM integrated device 12 of the Switching element according to the output signal of the first oscillation voltage supply unit 13 and the PWM integrated element 12 made of a resistor (R 13 ) and a capacitor (C 13 ) applied to the oscillation terminal (Osc) as an oscillation voltage ( (Not shown) supplies the operating power to the power supply terminal (Vcc) of the PWM integrated device 12 with a switching transformer (SWT) to which the power is induced and the power induced by the switching transformer (SWT). a diode (D 11), resistor (R 14) and a condenser with an operating power supply (C 14) (14) and the switching to Diodes D 12 and D 13 for applying an oscillation voltage of a level higher than that of the first oscillation voltage supply unit 13 to the oscillation terminal Osc of the PWM integrated device 12 with a power induced by a transformer SWT. A second oscillation voltage supply section 15 composed of resistors R 15 to R 17 and a capacitor C 15 is provided.

이와 같이 구성된 본 고안의 스위칭 모드 전원 공급장치의 발진 주파수 가변회로는 전원 스위치를 온할 경우에 초기 동작전원 공급부(11)의 브리지 다이오드(BD)가 공급되는 전원을 브리지 정류하고, 콘덴서(C11,C12)에 의해 평활된 후 저항(R11,R12)을 통해 PWM용 집적소자(12)의 전원단자(Vcc)에 동작전원으로 공급된다.The oscillation frequency variable circuit of the switching mode power supply of the present invention configured as described above bridges and rectifies the power supplied with the bridge diode BD of the initial operation power supply 11 when the power switch is turned on, and the capacitor C 11 ,. After smoothing by C 12 ) is supplied to the operating terminal Vcc of the PWM integrated device 12 through the resistors R 11 and R 12 .

이와 같이 PWM용 집적소자(12)의 전원단자(Vcc)에 동작전원이 공급되면, PWM용 집적소자(12)는 전원단자(Vcc)에 공급된 동작전원에 따라 기준 전압 단자(Vref)로 소정 레벨의 기준 전압을 출력하고, 출력한 기준전압은 제1발진전압 공급부(13)의 저항(R13) 및 접지 콘덴서(C13)를 통해 PWM용 집적소자(12)의 발진단자(Osc)에 발진전압으로 공급된다.When the operating power is supplied to the power terminal Vcc of the PWM integrated device 12 as described above, the PWM integrated device 12 is predetermined to the reference voltage terminal Vref according to the operating power supplied to the power terminal Vcc. The reference voltage of the level is output, and the output reference voltage is transmitted to the oscillation terminal Osc of the PWM integrated device 12 through the resistor R 13 of the first oscillation voltage supply unit 13 and the ground capacitor C 13 . It is supplied at the oscillation voltage.

그러면, PWM용 집적소자(12)가 발진하여 PWM 신호를 발생하고, 발생한 PWM 신호에 따라 스위칭 소자가 동작하면서 스위칭 트랜스(SWT)의 일차코일에서 이차코일로 전원이 유도된다.Then, the PWM integrated device 12 oscillates to generate a PWM signal, and the power supply is induced from the primary coil of the switching transformer SWT to the secondary coil while the switching device operates according to the generated PWM signal.

스위칭 트랜스(SWT)의 이차코일로 유도된 전원은 동작전원 공급부(14)의 다이오드(D11)를 통해 정류되고, 저항(R14) 및 접지 콘덴서(C14)에 의해 평활된 후 PWM용 집적소자(12)의 전원단자(Vcc)에 동작전원을 공급하게 된다.The power induced by the secondary coil of the switching transformer SWT is rectified through the diode D 11 of the operating power supply 14, smoothed by the resistor R 14 and the ground capacitor C 14 , and then integrated for PWM. The operating power is supplied to the power supply terminal Vcc of the element 12.

또한 스위칭 트랜스(SWT)의 이차코일로 유도된 전원이 제2발진전압 공급부(15)의 다이오드(D12)를 통해 정류되고, 저항(R15)을 통한 후 저항(R16) 및 접지 콘덴서(C15)에 의해 평활되며, 평활된 전원은 다이오드(D13) 및 저항(R17)을 통해 PWM용 집적소자(12)의 발진단자(Osc)에 인가된다.In addition, the power induced by the secondary coil of the switching transformer SWT is rectified through the diode D 12 of the second oscillation voltage supply unit 15, and then through the resistor R 15 , the resistor R 16 and the ground capacitor ( smoothed by C 15), and, smoothed power is applied to the oscillator terminals (Osc) of the diode (D 13) and a resistor (R 17) PWM integrated device (12) through.

여기서, 제2발진전압 공급부(15)에 의해 PWM용 집적소자(12)의 발진단자(Osc)에 인가되는 발진전압이 제1발진전압 공급부(13)가 공급하는 발진전압보다 높게 설정하면, PWM용 집적소자(12)의 발진 주파수가 증가하게 된다.If the oscillation voltage applied by the second oscillation voltage supply unit 15 to the oscillation terminal Osc of the PWM integrated element 12 is set higher than the oscillation voltage supplied by the first oscillation voltage supply unit 13, the PWM The oscillation frequency of the integrated device 12 is increased.

즉, 본 고안은 전원 스위치를 온하는 초기에 PWM용 집적소자(12)를 낮은 발진 주파수로 동작시켜 발생되는 피크 전압이 낮게 하고, 정상적으로 동작할 경우에 높은 발진 주파수로 발진하여 정상으로 동작되게 한다.That is, the present invention lowers the peak voltage generated by operating the PWM integrated device 12 at a low oscillation frequency at the initial time of turning on the power switch, and when operating normally, oscillates at a high oscillation frequency to operate normally. .

이상에서와 같이 본 고안은 전원 스위치를 온하는 초기에 PWM용 집적소자가 낮은 주파수로 발진되게 함으로써 발생되는 피크전압의 레벨이 낮아 피크전압으로 인한 부품의 손상을 방지하고, 정상으로 동작할 경우에는 PWM용 집적소자가 높은 주파수로 발진하게 하여 회로의 각 부위에 정상으로 동작전원을 공급할 수 있다.As described above, the present invention prevents damage to the components due to the peak voltage due to the low level of the peak voltage generated by causing the PWM integrated device to oscillate at a low frequency in the initial stage of turning on the power switch. The PWM integrated device can be oscillated at a high frequency to supply the operating power to each part of the circuit normally.

Claims (2)

전원 스위치를 온하는 초기에 동작 전원을 공급하는 초기전원 공급부(11)와, 상기 초기전원 공급부(11)의 출력전원으로 초기동작하여 PWM 발진하면서 전원 스위칭 동작을 제어하는 PWM용 집적소자(12)와, 상기 PWM용 집적소자(12)의 기준전압 단자(Vref)에서 출력되는 기준 전압을 PWM용 집적소자(12)의 발진단자(Osc)에 발진전압으로 인가하는 제1발진전압 공급부(13)와, PWM용 집적소자(12)의 출력신호에 따른 스위칭 소자의 제어에 따라 전원이 유도되는 스위칭 트랜스(SWT)와, 상기 스위칭 트랜스(SWT)로 유도된 전원으로 상기 PWM용 집적소자(12)의 전원단자(Vcc)에 동작전원을 공급하는 동작전원 공급부(14)와, 상기 스위칭 트랜스(SWT)로 유도된 전원으로 상기 PWM용 집적소자(12)의 발진단자(Osc)에 발진전압을 인가하는 제2발진전압 공급부(15)로 구성됨을 특징으로 하는 스위칭 모드 전원 공급장치의 발진 주파수 가변회로.Initial power supply unit 11 for supplying operation power at the initial stage of turning on the power switch, and PWM integrated device 12 for controlling the power switching operation while PWM oscillating by initial operation with the output power of the initial power supply unit 11. And a first oscillation voltage supply unit 13 for applying the reference voltage output from the reference voltage terminal Vref of the PWM integrated device 12 to the oscillation terminal Osc of the PWM integrated device 12 as an oscillation voltage. And a switching transformer (SWT) in which power is induced under control of a switching element according to an output signal of the PWM integrated element 12, and the power source induced in the switching transformer (SWT). The oscillation voltage is applied to the oscillation terminal Osc of the PWM integrated device 12 by an operating power supply unit 14 for supplying operating power to the power supply terminal Vcc of the power supply and a power induced by the switching transformer SWT. The second oscillation voltage supply unit 15 is characterized in that Oscillation frequency variable circuit in the referred mode power supply. 제1항에 있어서, 제2발진전압 공급부(15)는 상기 제1발진전압 공급부(13)보다 높은 레벨의 발진전압을 공급하는 것을 특징으로 하는 스위칭 모드 전원 공급장치의 발진 주파수 가변회로.2. The oscillation frequency variable circuit of claim 1, wherein the second oscillation voltage supply section (15) supplies an oscillation voltage of a level higher than that of the first oscillation voltage supply section (13).
KR2019960012550U 1996-05-20 1996-05-20 A variable circuit for oscillating frequency of switching mode power supply KR0139543Y1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9128504B2 (en) 2012-03-08 2015-09-08 Samsung Electronics Co., Ltd. Signal generation circuit, method of operating a signal generation circuit, and device for generating an output voltage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9128504B2 (en) 2012-03-08 2015-09-08 Samsung Electronics Co., Ltd. Signal generation circuit, method of operating a signal generation circuit, and device for generating an output voltage

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