KR200150622Y1 - Automatic power cut-off device in electronic equipment adopting SMP method - Google Patents
Automatic power cut-off device in electronic equipment adopting SMP method Download PDFInfo
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- KR200150622Y1 KR200150622Y1 KR2019940020715U KR19940020715U KR200150622Y1 KR 200150622 Y1 KR200150622 Y1 KR 200150622Y1 KR 2019940020715 U KR2019940020715 U KR 2019940020715U KR 19940020715 U KR19940020715 U KR 19940020715U KR 200150622 Y1 KR200150622 Y1 KR 200150622Y1
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- 238000009499 grossing Methods 0.000 claims abstract description 9
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Classifications
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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
- H02H7/1213—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 DC-DC converters
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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
- H02M3/33523—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 with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
본 고안은 SMPS방식중 스위칭신호로서 펄스폭변조신호를 출력하는 PWM방식의 전원장치를 채용한 전자기기에 있어서 전원온된 상태에서 일정시간동안 부하의 변동이 없는 경우를 SMPS 스위칭 주파수를 이용하여 검출하여 자동으로 전원을 오프시키도록 하는 SMPS방식을 채용한 전자기기에서의 자동 전원차단장치를 제공하기 위한 것이다.The present invention uses SMPS switching frequency to detect the case where there is no load change in the power-on state for a certain time in an electronic device adopting a PWM type power supply that outputs a pulse width modulated signal as a switching signal among SMPS methods. It is to provide an automatic power cut device in an electronic device adopting the SMPS method to turn off the power automatically.
이를 위해 본 고안은, 교류전원입력단에서 입력되는 교류전원을 정류 및 평활화하기 위한 정류/평활회로(2)와, 상기 평활화된 직류전원을 인가받아 전압변환하는 트랜스포머(4), 상기 트랜스포머(4)의 1차측에 설치되어 하기의 펄스폭변조(PWM)제어집적회로(6)로부터의 펄스폭변조신호에 따라 상기 트랜스 포머(4)의 1차측 코일의 유기 전류량을 스위칭하는 스위칭 트랜지스터(Q1), 입력전압과 부하 전압에 따라 상기 스위칭 트랜지스터(Q1)에 펄스폭변조된 스위칭제어신호를 출력하는 PWM제어집적회로(6), 교류전원입력단으로부터의 전원을 공급 및 차단하기 위해 스위칭수단(SW)을 온/오프 제어하기 위한 전원제어부(20)를 구비한 SMPS방식의 전원장치에 있어서; 상기 PWM제어집적회로(6)로부터 스위칭 제어신호를 적분하여 직류레벨로 변환하는 적분부(8)와; 상기 적분부(8)로부터의 직류레벨신호에 따라 다른 주파수발진신호를 출력하는 전압제어발진부(10); 상기 전압제어발진부(10)의 출력주파수를 카운트하는 주파수카운터(12); 상기 주파수카운터(14)로부터의 카운트신호를 입력받아 그 주파수카운트신호가 일정시간동안 일정하게 유지되는 경우 상기 전원제어부(20)를 제어하여 전원이 차단되도록 하는 마이컴(14)을 더 구비하여 이루어진 것을 특징으로 한다.To this end, the present invention, a rectifier / smoothing circuit (2) for rectifying and smoothing the AC power input from the AC power input terminal, a transformer (4), the transformer (4) for receiving the smoothed DC power A switching transistor (Q1) provided at the primary side of the switching element for switching the amount of induced current of the primary coil of the transformer (4) in accordance with the pulse width modulation signal from the pulse width modulation (PWM) control integrated circuit (6) below; PWM control integrated circuit 6 for outputting a pulse width-modulated switching control signal to the switching transistor Q1 in accordance with an input voltage and a load voltage, and switching means SW for supplying and disconnecting power from an AC power input terminal. An SMPS power supply device having a power supply control unit 20 for on / off control; An integrating unit (8) for integrating the switching control signal from the PWM control integrated circuit (6) and converting it into a DC level; A voltage controlled oscillator 10 for outputting a different frequency oscillation signal in accordance with the DC level signal from the integrator 8; A frequency counter 12 for counting the output frequency of the voltage controlled oscillator 10; And receiving a count signal from the frequency counter 14, and if the frequency count signal remains constant for a predetermined time, the microcomputer 14 further controls the power control unit 20 to cut off the power. It features.
Description
제1도는 본 고안에 따른 SMPS방식을 채용한 전자기기에서의 자동 전원차단 장치의 블럭구성도.1 is a block diagram of an automatic power cut-off device in an electronic device employing an SMPS method according to the present invention.
제2도 및 제3도는 제1도에 도시한 각 구성요소의 출력특성을 나타낸 파형도이다.2 and 3 are waveform diagrams showing output characteristics of each component shown in FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
2 : 정류/평활회로 4 : 트랜스포머2: rectification / smoothing circuit 4: transformer
6 : PWM제어집적회로 8 : 적분부6: PWM control integrated circuit 8: Integrator
10 : 전압제어발진부 12 : 주파수카운터10: voltage controlled oscillator 12: frequency counter
14 : 마이컴 16 : 타이머14: Micom 16: Timer
본 고안은 SMPS(Switching Mode Power Supply)방식을 채용한 전자기기에서의 자동 전원차단장치에 관한 것으로, 보다 상세하게는 SMPS방식중 스위칭신호로서 펄스폭변조(PWM)신호를 출력하는 PWM방식의 전원장치를 채용한 전자기기에 있어서 전원온된 상태에서 일정시간동안 부하의 변동이 없는 경우 자동으로 전원이 오프되도록 하는 SMPS방식을 채용한 전자기기에서의 자동 전원차단장치에 관한 것이다.The present invention relates to an automatic power cut-off device in an electronic device employing a SMPS (Switching Mode Power Supply) method, and more particularly, a PWM power source that outputs a pulse width modulation (PWM) signal as a switching signal of the SMPS method. The present invention relates to an automatic power cut-off device in an electronic device employing an SMPS system that automatically turns off the power when there is no load change for a predetermined time in a power-on electronic device.
일반적으로, SMPS방식의 전원장치가 채용된 예컨대 비디오테이프레코더나 광디스크플레이어와 같은 전자기기에 있어서는 마이컴이 기기의 전면에 설치된 조작패널이나 리모콘으로 이루어진 키입력부로부터의 전원온 또는 오프입력을 받으면 전원제어부를 제어하여 외부전원로부터의 전원을 공급 또는 차단시키도록 되어 있다.In general, in an electronic device such as a video tape recorder or an optical disc player in which an SMPS power supply is employed, the power control unit receives a power on or off input from a key input unit comprising a control panel or a remote control installed in the front of the device. It is to control or supply or cut off the power from the external power source.
그런데, 이러한 전자기기에 있어서 사용자가 전원을 온상태로 설정해 놓고서 그 사실을 망각한 채로 동작모드를 선택하지 않고 장기간동안 방치하는 경우가 있는데, 이러한 경우에는 불필요한 전력손실이 야기된다는 문제가 있다.However, in such an electronic device, the user sets the power to the ON state and leaves the power for a long time without selecting the operation mode, forgetting the fact.
또한, 비디오테이프레코더나 광디스크플레이어 등에 있어서 사용자가 기록 매체의 재생도중에 잠이 드는 경우가 발생하는데, 이러한 경우에는 일반적으로 기록매체의 재생이 완료되면 기기 자체에서 이를 판단하고 재생모드를 종료하도록 되어 있지만, 여전히 기기의 전원 온상태가 유지되어 불필요한 전력손실이 야기된다는 문제가 있다.In addition, in a video tape recorder or an optical disc player, a user may fall asleep while the recording medium is being played back. In this case, when the recording medium is finished playing, the device itself judges this and ends the playback mode. However, there is still a problem that the power on state of the device is maintained, causing unnecessary power loss.
이러한 문제를 감안하여 최근에는 SMPS방식을 채용한 전자기기에서 자동으로 전원을 차단하는 장치가 개방되어 있기만, 이러한 장치는 단지 SMPS방식중RCC (Ringing Chock Convertor)방식에서만 적용할 수 있는 것이다. 즉, RCC방식에서는 출력조건의 변화에 따라 스위칭 주파수가 가변되는데, 이 스위칭 주파수를 이용하여 그 주파수가 소정의 설정시간동안 일정하게 유지되는 경우 어떠한 동작모드도 선택되지 않아서 부하가 일정한 상태라고 판단하여 외부로부터의 전원공급을 자동으로 차단하도록 되어 있는 것이다. 그러나, 이러한 기술은 SMPS방식중 스위칭신호로서 펄스폭변조신호를 출력하는 펄스폭변조방식에서는 적용할 수 없다는 문제가 있다. 따라서, 펄스폭변조방식에서 어떠한 동작모드도 선택되지 않아서 부하가 일정한 상태에서 외부로부터의 전원공급을 자동으로 차단하도록 된 장치의 개발이 요망된다.In consideration of these problems, in recent years, devices that automatically shut off power in electronic devices employing SMPS methods are open, but these devices are applicable only to the Ringing Chock Convertor (RCC) method among SMPS methods. That is, in the RCC method, the switching frequency is changed according to the change of the output condition.If the frequency is kept constant for a predetermined time by using the switching frequency, no operation mode is selected and the load is determined to be constant. It is to automatically cut off the power supply from the outside. However, such a technique has a problem in that it is not applicable to the pulse width modulation method of outputting a pulse width modulation signal as a switching signal in the SMPS method. Therefore, it is desired to develop an apparatus in which no operation mode is selected in the pulse width modulation scheme so that the power supply from the outside is automatically cut off under a constant load.
이에 본 고안은 상기한 사정을 감안하여 이루어진 것으로, SMPS방식중 스위칭신호로서 펄스폭변조신호를 출력하는 PWM방식의 전원장치를 채용한 전자기기에 있어서 전원온된 상태에서 일정시간동안 부하의 변동이 없는 경우를 SMPS 스위칭 주파수를 이용하여 검출하여 자동으로 전원을 오프시키도록 하는 SMPS방식을 채용한 전자기기에서의 자동 전원차단장치를 제공하고자 함에 그 목적이 있다.The present invention has been made in view of the above circumstances, and in an electronic device employing a PWM type power supply which outputs a pulse width modulated signal as a switching signal among SMPS methods, the load fluctuations are maintained for a predetermined time while the power is turned on. It is an object of the present invention to provide an automatic power cut-off device in an electronic device employing an SMPS method that detects a case of absence using the SMPS switching frequency and automatically turns off the power.
상기한 목적을 달성하기 위해 본 고안의 바람직한 실시양태에 따른 SMPS방식을 채용한 전자기기에서의 자동 전원차단장치에 따르면, 교류전원입력단에서 입력되는 교류전원을 정류 및 평활화하기 위한 정류/평활회로와, 상기 평활화된 직류전원을 인가받아 전압변환하는 트랜스포머, 상기 트랜스포머의 1차측에 설치되어 하기의 펄스폭변조(PWM)제어집적회로로부터의 펄스폭변조신호에 따라 상기 트랜스포머의 1차측 코일의 유기전류량을 스위칭하는 스위칭 트랜지스터, 입력전압과 부하전압에 따라 상기 스위칭 트랜지스터에 펄스폭변조된 스위칭제어신호를 출력하는 PWM제어집적회로, 교류전원입력단으로부터의 전원을 공급 및 차단하기 위해 스위칭수단을 온/오프 제어하기 위한 전원제어부를 구비한 SMPS방식의 전원장치에 있어서; 상기 PWM제어집적회로로부터 스위칭 제어신호를 적분하여 직류 레벨로 변환하는 적분부와, 상기 적분부로부터의 직류레벨신호에 따라 다른 주파수발진신호를 출력하는 전압제어발진부, 상기 전압제어발진부의 출력주파수를 카운트하는 주파수카운터 및, 상기 주파수카운터로부터의 카운트신호를 입력받아 그 주파수카운트신호가 일정시간동안 일정하게 유지되는 경우 상기 전원제어부를 제어하여 전원이 차단되도록 하는 마이컴을 더 구비하여 이루어진 것을 특징으로 한다.According to the automatic power cut device in an electronic device employing the SMPS method according to a preferred embodiment of the present invention to achieve the above object, the rectification / smoothing circuit for rectifying and smoothing the AC power input from the AC power input terminal; And an organic current amount of a transformer applied to the smoothed DC power supply and a voltage conversion signal installed on the primary side of the transformer in accordance with a pulse width modulation signal from a pulse width modulation (PWM) control integrated circuit described below. A switching transistor for switching a circuit, a PWM control integrated circuit for outputting a pulse width-modulated switching control signal to the switching transistor according to an input voltage and a load voltage, and switching means for supplying and disconnecting power from an AC power input terminal. An SMPS power supply having a power supply control unit for controlling the power supply; An integration unit for integrating a switching control signal from the PWM control integrated circuit to convert it into a DC level, a voltage controlled oscillator for outputting a different frequency oscillation signal according to the DC level signal from the integrator, and an output frequency of the voltage controlled oscillator And a microcomputer to control the power control unit when the frequency counter to count and the count signal from the frequency counter are input and the frequency count signal is kept constant for a predetermined time. .
상기와 같이 구성된 본 고안에 의하면, SMPS방식중 스위칭신호로서 펄스폭변조신호를 출력하는 PWM방식의 전원장치를 채용한 전자기기에 있어서, 상기 스위칭신호로서 펄스폭변조신호를 적분하여 직류레벨로 변환하고 이 직류레벨로 변환된 신호를 전압제어발진부의 제어신호로 인가하며 상기 전압제어발진부의 출력신호의 주파수를 카운트하여, 그 주파수카운트신호가 소정의 설정시간동안 일정하게 유지되는 경우를 전원만 온되어 있고 어떠한 동작모드로 선택되어 있지 않은 상태라고 판단하고서 외부로부터의 전원공급을 차단하게 된다.According to the present invention configured as described above, in an electronic device employing a PWM type power supply that outputs a pulse width modulated signal as a switching signal among SMPS methods, the pulse width modulated signal is integrated as the switching signal and converted into a DC level. And applying the signal converted to the DC level as a control signal of the voltage controlled oscillator, counting the frequency of the output signal of the voltage controlled oscillator, and turning on the power only when the frequency count signal is kept constant for a predetermined time. Power supply from the outside is cut off by judging that the operation mode is not selected in any operation mode.
이하, 본 고안에 따른 SMPS방식을 채용한 전자기기에서의 자동 전원차단장치에 대해 상세히 설명한다.Hereinafter, an automatic power cut device in an electronic device employing the SMPS method according to the present invention will be described in detail.
제1도는 본 고안에 따른 SMPS방식을 채용한 전자기기에서의 자동 전원차단장치의 블럭구성도이다. 동 도면에서, 참조부호 2는 교류전원입력단에서 입력되는 교류전원을 정류하는 정류회로와 정류된 신호를 평활화하기 위한 평활용 캐패시터로 이루어진 정류/평활회로이고, 4는 상기 평활화된 직류전원을 인가받아 전압변환하여 2차측에 접속된 부하단으로 출력하기 위한 트랜스포머이다.1 is a block diagram of an automatic power cutoff device in an electronic device employing an SMPS method according to the present invention. In the figure, reference numeral 2 denotes a rectifier / smooth circuit comprising a rectifier circuit for rectifying the AC power input from the AC power input terminal and a smoothing capacitor for smoothing the rectified signal, and 4 is applied with the smoothed DC power. Transformer for voltage conversion and output to the load terminal connected to the secondary side.
그리고, 참조부호 Q1은 상기 트랜스포모(4)의 1차측에 설치되어 하기의 PWM제어집적회로(6)로부터 펄스폭변조신호에 따라 상기 트랜스포머(4)의 1차측 코일의 유기전류량을 스위칭제어하는 스위칭 트랜지스터이고, 6은 입력전압과 부하 전압에 따라 상기 스위칭 트랜지스터(Q1)에 펄스폭변조된 스위칭제어신호를 출력하는 PWM제어집적회로이며, 20은 하기 마이컴(14)의 제어신호에 따라 교류전원입력단으로부터의 전원을 공급 및 차단하기 위해 스위칭수단(S/W)을 온/오프 제어하기 위한 전원제어부이다.Reference numeral Q1 is provided on the primary side of the transformer 4 to switch and control the amount of induced current of the primary coil of the transformer 4 according to the pulse width modulation signal from the PWM control integrated circuit 6 described below. 6 is a switching transistor, and 6 is a PWM control integrated circuit for outputting a pulse width-modulated switching control signal to the switching transistor Q1 according to an input voltage and a load voltage, and 20 is an AC power supply according to a control signal of the microcomputer 14 below. A power control unit for controlling the switching means (S / W) on / off to supply and cut off the power from the input.
또, 참조부호 18은 전원 온/오프버튼등의 제어버튼을 갖추고서 거기의 전면에 설치된 조작패널이나 리모콘으로 이루어진 키입력부이고, 16은 시간을 계시하기 위한 타이머이다.Reference numeral 18 denotes a key input section comprising an operation panel or a remote control provided in front of the control panel, such as a power on / off button, and 16, a timer for timekeeping.
또한 참조부호 8은 상기 PWM제어집적회로(6)로부터 스위칭 제어신호를 입력받아 적분하여 직류레벨로 변환하는 적분부이고, 10은 상기 적분부(8)로부터의 직류레벨신호에 따라 다른 주파수발진신호를 출력하는 전압제어발진부이며, 12는 상기 전압제어발진부(10)의 출력주파수를 카운트하는 주파수카운터이다.In addition, reference numeral 8 is an integrator which receives the switching control signal from the PWM control integrated circuit 6 and integrates it into a DC level, and 10 denotes a frequency oscillation signal different according to the DC level signal from the integrator 8. Is a voltage controlled oscillator for outputting the signal, and 12 is a frequency counter for counting the output frequency of the voltage controlled oscillator.
그리고, 참조부호 14는 상기 키입력부(18)로부터의 전원온/오프입력에 따라 상기 전원제어부(20)를 제어하여 외부전원을 차단하는 한편, 상기 주파수카운터(12)로부터의 카운트신호를 입력받아 그 주파수카운트신호가 상기 타이머(16)의 계시치를 근거로 일정시간(예컨대 10분)동안 일정하게 유지되는 경우를 전원만 온되어 있고 어떠한 동작모드도 선택되지 않은 상태라고 판단하고서 상기 전원제어부(20)를 제어하여 전원이 차단되도록 하는 마이컴이다.In addition, the reference numeral 14 controls the power controller 20 to cut off the external power according to the power on / off input from the key input unit 18, and receives a count signal from the frequency counter 12. When the frequency count signal is kept constant for a predetermined time (for example, 10 minutes) based on the time value of the timer 16, the power control unit 20 determines that only the power is on and no operation mode is selected. ) To control the power off.
여기서, 상기 PWM제어집적회로(6)의 스위칭제어신호로서 펄스폭변조출력신호는 출력조건이 변동하더라도 항상 일정한 주파수를 유지하므로 RCC방식에서와 같이 스위칭제어신호의 주파수 변화량을 검출하는 것이 무의미하다. 따라서, 본 고안에서는 스위칭제어신호로서 펄스폭변조출력신호의 일정 주파수에서 온-듀티(ON-DUTY)만을 검출하여 그 값을 직류레벨로 변환하고, 그 직류레벨값의 변화를 전압제어발진부에서 주파수의 변화량으로 변환하며, 전압제어발진부의 출력주파수를 주파수카운터에서 카운트하여 그 카운트값이 소정의 설정시간동안 일정값으로 변동이 없는 경우에 외부입력전원을 자동으로 차단하도록 하고 있다.Here, since the pulse width modulated output signal as the switching control signal of the PWM control integrated circuit 6 maintains a constant frequency at all times even when the output conditions change, it is meaningless to detect the frequency change amount of the switching control signal as in the RCC method. Therefore, in the present invention, only the ON-DUTY is detected at a constant frequency of the pulse width modulation output signal as a switching control signal, and its value is converted into a DC level, and the change of the DC level value is a frequency in the voltage controlled oscillator. The output frequency of the voltage controlled oscillator is counted by a frequency counter, and the external input power is automatically cut off when the count value does not change to a constant value for a predetermined time.
다음으로, 상기와 같이 구성된 본 고안에 대하여 제2도 및 제3도의 신호파형도를 참조하여 상세히 설명한다.Next, the present invention constructed as described above will be described in detail with reference to the signal waveforms of FIGS. 2 and 3.
먼저, 전원이 온되어 있는 상태에서 기기가 소정의 동작모드로 동작하고 있는 동안에는 PWM제어집적회로(6)의 스위칭신호로서 PWM출력신호의 펄스폭이 제2도(a)에 나타낸 바와 같이 변동하고, 적분부(8)의 출력신호도 제2도(b)에 나타낸 바와 같이 가변하게 된다. 그리고, 전압제어발진부(10)의 출력주파수는 상기 적분부(8)의 출력전압레벨에 따라 제2도(c)에 나타낸 바와 같이 가변된다[즉, 상기 전압제어발진부(10)의 출력주파수는 입력전압이 상승하면 증가하고 압력전압이 하강하면 감소하게 된다]. 따라서, 전압제어발진부(10)의 출력주파수를 주파수카운터(12)에서 카운트한 결과가 일정하기 않으므로, 마이컴(14)은 전원제어부(20)에 전원온 제어신호로서 예컨대 하이레벨의 신호를 지속적으로 출력하게 된다.First, while the device is operating in a predetermined operation mode while the power is on, the pulse width of the PWM output signal as the switching signal of the PWM control integrated circuit 6 is changed as shown in FIG. The output signal of the integrating section 8 is also variable as shown in Fig. 2B. The output frequency of the voltage controlled oscillator 10 is varied as shown in FIG. 2C according to the output voltage level of the integrator 8 (that is, the output frequency of the voltage controlled oscillator 10 is It increases when the input voltage rises and decreases when the pressure voltage drops. Therefore, since the result of counting the output frequency of the voltage controlled oscillator 10 at the frequency counter 12 is not constant, the microcomputer 14 continuously transmits a high level signal to the power controller 20 as a power-on control signal, for example. Will print.
그 반면에, 전원이 온되어 있는 상태에서 기기가 어떠한 동작모드로 설정되어 있지 않는 동안에는 PWM제어집적회로(6)의 스위칭신호로서 PWM출력신호의 펄스폭이 제3도(a)에 나타낸 바와 같이 일정하고, 적분부(8)의 출력신호도 제3도(b)에 나타낸 바와 같이 일정하게 된다. 그리고, 전압제어발진부(10)의 출력주파수는 상기 적분부(8)의 출력전압레벨에 따라 제3도(c)에 나타낸 바와 같이 일정하게 된다. 따라서, 전압제어발진부(10)의 출력주파수를 주파수카운터(12)에서 카운트한 결과가 타이머(16)의 계시치를 근거로 소정의 설정시간(T)동안 일정한 상태로 지속되는 경우, 마이컴(14)은 현재의 상태가 전원만 온되어 있고 어떠한 동작모드도 선택되어 있지 않은 상태라고 판단하고서 전원제어부(20)에 전원 오프 제어신호로서 예컨대 로우레벨의 신호를 출력함으로써, 전원제어부(20)에 의해 스위칭수단(SW)가 오프상태로 되도록 한다.On the other hand, while the device is not set to any operation mode while the power is on, the pulse width of the PWM output signal as the switching signal of the PWM control integrated circuit 6 is shown in Fig. 3 (a). It is constant and the output signal of the integrating unit 8 is also constant as shown in FIG. 3 (b). The output frequency of the voltage controlled oscillator 10 is constant as shown in FIG. 3C according to the output voltage level of the integrator 8. Therefore, when the result of counting the output frequency of the voltage controlled oscillator 10 by the frequency counter 12 is maintained in a constant state for a predetermined time T based on the time value of the timer 16, the microcomputer 14 Is judged that the current state is the only power-on state and no operation mode is selected, and is switched by the power supply control unit 20 by outputting a low level signal as a power-off control signal to the power supply control unit 20, for example. The means SW are made to be in the OFF state.
이상 설명한 바와 같이 본 고안에 따르면, SMPS방식중 스위칭신호로서 펄스폭변조신호를 출력하는 PWM방식의 전원장치를 채용한 전자기기에 있어서 상기 스위칭신호로서 펄스폭변조신호를 적분하여 직류레벨로 변환하고 이 직류레벨로 변환된 신호를 전압제어발진부의 제어신호로 인가하며 상기 전압제어발진부의 출력신호의 주파수를 카운트하여, 그 주파수카운트신호가 소정의 설정시간동안 일정하게 유지되는 경우를 전원만 온되어 있고 동작모드가 선택되지 않은 상태라고 판단하고서 외부로부터의 전원공급을 차단하게 된다. 따라서 어떠한 동작모드로 선택되지 않고 전원만 온되어 있는 상태를 정확하게 검출함으로써, 기기가 이러한 상태로 장기간동안 방치됨에 따른 불필요한 전력손실을 방지할 수 있게 된다.As described above, according to the present invention, in an electronic device employing a PWM type power supply that outputs a pulse width modulated signal as a switching signal among SMPS methods, the pulse width modulated signal is integrated as the switching signal and converted into a DC level. The signal converted to the DC level is applied as a control signal of the voltage controlled oscillator, and the frequency of the output signal of the voltage controlled oscillator is counted, and only the power is turned on when the frequency count signal is kept constant for a predetermined time. It determines that the operation mode is not selected and cuts off the power supply from the outside. Therefore, by accurately detecting a state in which only the power source is turned on without selecting any operation mode, it is possible to prevent unnecessary power loss as the device is left in this state for a long time.
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| KR100686122B1 (en) | 2006-02-13 | 2007-02-26 | 엘지전자 주식회사 | Drive power cut-off device of DC / DC converter |
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| KR100686122B1 (en) | 2006-02-13 | 2007-02-26 | 엘지전자 주식회사 | Drive power cut-off device of DC / DC converter |
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