KR200203121Y1 - Oscillating circuit of power supply in corresponding with sync signal - Google Patents
Oscillating circuit of power supply in corresponding with sync signal Download PDFInfo
- Publication number
- KR200203121Y1 KR200203121Y1 KR2019970022239U KR19970022239U KR200203121Y1 KR 200203121 Y1 KR200203121 Y1 KR 200203121Y1 KR 2019970022239 U KR2019970022239 U KR 2019970022239U KR 19970022239 U KR19970022239 U KR 19970022239U KR 200203121 Y1 KR200203121 Y1 KR 200203121Y1
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- power supply
- horizontal
- circuit
- oscillation
- frequency
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
Abstract
본 고안은 전원부에서 PWM제어부분의 발진회로에 관한 것으로서, 특히 전원부 발진주파수와 수평회로 발진주파수를 동일하게 하여 전원부 스위칭시 발생하는 화면 노이즈를 최소화시키기 위한 수평동기신호에 따른 전원부 발진회로에 관한 것이다.The present invention relates to the oscillation circuit of the PWM control part in the power supply, and more particularly to the power supply oscillation circuit according to the horizontal synchronization signal for minimizing the screen noise generated when switching the power supply by equalizing the oscillation frequency of the power supply and the horizontal circuit oscillation frequency. .
그러나, 종래 전원부 발진회로는 전원부 발진 주파수와 수평회로부 발진 주파수가 동일하지 않아 전원부 스위칭시 화면에 노이즈가 발생된다.However, in the conventional power source oscillation circuit, the power source oscillation frequency and the horizontal circuit unit oscillation frequency are not the same, so noise is generated on the screen when the power supply unit is switched.
따라서, 본 고안은 상기와 같은 종래의 문제점을 해결하기 위해 FBT에서 플라이백 펄스를 유기시켜 전원부의 발진회로에 강제 트리거(Trigger)시킴으로서 전원부와 수평회로가 동일 주파수로 스위칭할 수 있도록 하여 전원부 스위칭시 발생하는 화면 노이즈를 최소화시켜 화질을 향상시키는데 그 주된 목적이 있다.Therefore, in order to solve the above-mentioned problems, the present invention induces a flyback pulse in the FBT to forcibly trigger the oscillation circuit of the power supply unit so that the power supply unit and the horizontal circuit can switch to the same frequency so that the power supply unit switches at the same frequency. Its main purpose is to improve image quality by minimizing screen noise.
Description
본 고안은 전원부에서 PWM제어부분의 발진회로에 관한 것으로서, 특히 전원부 발진주파수와 수평회로 발진주파수를 동일하게 하여 전원부 스위칭시 발생하는 화면 노이즈를 최소화시키기 위한 수평동기신호에 따른 전원부 발진회로에 관한 것이다.The present invention relates to the oscillation circuit of the PWM control part in the power supply, and more particularly to the power supply oscillation circuit according to the horizontal synchronization signal for minimizing the screen noise generated when switching the power supply by equalizing the oscillation frequency of the power supply and the horizontal circuit oscillation frequency. .
종래 전원부 발진회로에서는 전원부의 발진시정수에 의해 전원부가 발진하게 되며 발진회로에서 출력된 구형파 펄스에 의해 전원부의 스위칭회로가 스위칭동작하게 된다.In the conventional power supply oscillation circuit, the power supply unit oscillates by the oscillation time constant of the power supply unit, and the switching circuit of the power supply unit switches by the square wave pulse output from the oscillation circuit.
그러나, 종래 전원부 발진회로는 전원부 발진 주파수와 수평회로부 발진 주파수가 동일하지 않아 전원부 스위칭시 화면에 노이즈가 발생된다.However, in the conventional power source oscillation circuit, the power source oscillation frequency and the horizontal circuit unit oscillation frequency are not the same, so noise is generated on the screen when the power supply unit is switched.
따라서, 본 고안은 상기와 같은 종래의 문제점을 해결하기 위해 FBT에서 플라이백 펄스를 유기시켜 전원부의 발진회로에 강제 트리거(Trigger)시킴으로서 전원부와 수평회로가 동일 주파수로 스위칭할 수 있도록 하여 전원부 스위칭시 발생하는 화면 노이즈를 최소화시켜 화질을 향상시키는데 그 주된 목적이 있다.Therefore, in order to solve the above-mentioned problems, the present invention induces a flyback pulse in the FBT to forcibly trigger the oscillation circuit of the power supply unit so that the power supply unit and the horizontal circuit can switch to the same frequency so that the power supply unit switches at the same frequency. Its main purpose is to improve image quality by minimizing screen noise.
도 1은 본 고안 수평동기신호에 따른 전원부 발진회로의 회로도1 is a circuit diagram of a power supply oscillation circuit according to the present invention horizontal synchronization signal
도 2의 (가)내지 (다)는 본 발명에서 각부 출력 파형도Figure 2 (a) to (c) is the output waveform diagram of each part in the present invention
도 3a는 종래 수평회로의 스위칭 타임과 전원부 스위칭 타임이 다를 경우를 나타낸 도면으로서, (가)는 전원부 스위칭 파형, (나)는 전원 라인 DC 전압, (다)는 수평회로의 스위칭 파형, (라)는 수평 주사영역, (마)는 모니터 화면영역을 나타낸 것이다.3A is a diagram illustrating a case where a switching time and a power supply switching time of a conventional horizontal circuit are different, (a) a power supply switching waveform, (b) a power line DC voltage, and (c) a switching waveform of a horizontal circuit. ) Denotes the horizontal scanning area, and (e) denotes the monitor screen area.
도 3b는 본 고안이 적용되어 수평회로의 스위칭 타임과 전원부 스위칭 타임이 같을 경우를 나타낸 도면으로서, (가)는 전원부 스위칭 파형, (나)는 전원 라인 DC 전압, (다)는 수평회로의 스위칭 파형, (라)는 수평 주사영역, (마)는 모니터 화면영역을 나타낸 것이다.Figure 3b is a diagram showing a case in which the switching time and the power supply switching time of the horizontal circuit is the same by applying the present invention, (a) is the power supply switching waveform, (b) is the power line DC voltage, (c) is the switching of the horizontal circuit Waveform, (d) shows horizontal scanning area, and (e) shows monitor screen area.
상기 목적달성을 위한 본 고안 수평동기신호에 따른 전원부 발진회로의 구성은 도 1에 도시된 바와같이, 수평동기신호에 의해 플라이백 트랜스(FBT)에서 수평펄스를 발생시키는 수평회로(11)와, 상기 수평회로(11)에서 발생된 수평펄스에 의해 발진펄스가 트리거되어져 화면노이즈를 최소화하기 위한 전원부 발진회로(12)로 구성된다.The configuration of the power supply oscillation circuit according to the present invention the horizontal synchronization signal for achieving the object is a horizontal circuit 11 for generating a horizontal pulse in the flyback transformer (FBT) by the horizontal synchronization signal, and The oscillation pulse is triggered by the horizontal pulse generated by the horizontal circuit 11, and is composed of a power supply oscillation circuit 12 for minimizing screen noise.
상기와 같이 구성된 본 고안 수평동기신호에 따른 전원부 발진회로의 작용효과는 도 1과 도 2를 참조하여 설명하면 다음과 같다.The operational effects of the power supply oscillation circuit according to the present invention horizontal synchronization signal configured as described above will be described with reference to FIGS. 1 and 2.
먼저, 수평회로(11)의 플라이백 트랜스(FBT)에 수평동기신호가 입력되면 FBT의 코어(CORE)에 와이어(Wire)를 일정횟수 감아 수평펄스를 유기시킨다.First, when a horizontal synchronous signal is input to the flyback transformer FBT of the horizontal circuit 11, the wire is wound around the core CORE a predetermined number of times to induce the horizontal pulse.
이때, FBT에서 유기된 수평펄스는 저항(R1)에 의해 강하되어 콘덴서(C1)를 통해 교류성분(AC)만이 통과되며, 다이오드(D1)는 수평펄스에서 마이너스(-)전압을 차단시킨다.At this time, the horizontal pulse induced in the FBT is dropped by the resistor R1, and only the AC component AC passes through the capacitor C1, and the diode D1 blocks the negative voltage at the horizontal pulse.
한편, 콘덴서(C1) 및 다이오드(D2)를 통해 출력된 수평펄스는 PWM제어IC(12a)의 발진시정수 R2C2에 의해 발진을 강제 트리거(Trigger)시켜 전원주파수를 수평주파수와 동일주파수로 발진하게 만든다.On the other hand, the horizontal pulse output through the capacitor (C1) and diode (D2) is forced to trigger the oscillation by the oscillation time constant R 2 C 2 of the PWM control IC (12a) to make the power supply frequency equal to the horizontal frequency Makes it rash
즉, 도 2의 (가)와 같은 R2C2발진시정수에 의한 발진파형이, (나)파형과 같은 수평펄스에 의해 트리거되어져 (다)와 같이 전원부 발진펄스가 수평펄스와 동일주파수로 출력된다.That is, the oscillation waveform by the R 2 C 2 oscillation time constant as shown in (a) of FIG. 2 is triggered by the horizontal pulse such as (b) waveform, and the oscillation pulse of the power supply unit outputs the same frequency as the horizontal pulse as do.
이때, PWM제어IC(12a)의 충방전 과정은 PWM제어IC(12a)의 Ref로부터 저항(R2)을 통해 콘덴서(C2)에 충전하게 되며, 방전은 내부전류원에 의해 방전하게 된다.At this time, the charge / discharge process of the PWM control IC 12a is charged from the Ref of the PWM control IC 12a through the resistor R2 to the capacitor C2, and the discharge is discharged by the internal current source.
수평회로(11)에서 PWM제어IC(12a)의 발진을 강제 트리거시키지 않았을 경우 PWM제어IC(12a)의 충방전시간과 발진주파수는 다음과 같다.When the oscillation of the PWM control IC 12a is not forcibly triggered in the horizontal circuit 11, the charge and discharge time and the oscillation frequency of the PWM control IC 12a are as follows.
충전시간 tC= 0.55R2C2 Charging time t C = 0.55R 2 C 2
방전시간 td= R2C2
발진주파수 f=
그러나, 수평회로에서 전원부 발진을 강제 트리거시키므로 전원 발진주파수는 수평회로부의 수평펄스주파수와 동일하게 된다.However, since the oscillation of the power supply unit is forcibly triggered in the horizontal circuit, the power supply oscillation frequency is equal to the horizontal pulse frequency of the horizontal circuit unit.
따라서, 전원부 스위칭시 발생하는 화면노이즈를 최소화시킬 수 있게 된다.Therefore, it is possible to minimize the screen noise generated when switching the power supply.
멀티싱크(Multi-sync)모니터에서는 PC(컴퓨터)의 수평주파수가 변화하면서 해상도도 변화하는데, 수평주파수가 변화하면 전원부의 발진주파수도 강제 트리거되어져 자동으로 변화하게 되는 수평동기방식 전원부 발진 회로이다.In a multi-sync monitor, the resolution changes as the horizontal frequency of a PC changes, and when the horizontal frequency changes, the oscillation frequency of the power unit is also forcibly triggered to change automatically.
상기와 같이 작용하는 본 고안 수평동기신호에 따른 전원부 발진회로는 전원부 발진주파수와 수평회로부의 발진주파수를 동일하게 하여 전원부 스위칭동작시 발생하는 전원노이즈를 최소화시킴으로서 화질을 향상시킬수 있는 효과가 있다.The power supply oscillation circuit according to the present invention horizontal synchronizing signal acts as described above to improve the image quality by minimizing power supply noise generated during power supply switching operation by equalizing the power supply oscillation frequency and the horizontal circuit oscillation frequency.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019970022239U KR200203121Y1 (en) | 1997-08-14 | 1997-08-14 | Oscillating circuit of power supply in corresponding with sync signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019970022239U KR200203121Y1 (en) | 1997-08-14 | 1997-08-14 | Oscillating circuit of power supply in corresponding with sync signal |
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| Publication Number | Publication Date |
|---|---|
| KR19990009049U KR19990009049U (en) | 1999-03-05 |
| KR200203121Y1 true KR200203121Y1 (en) | 2000-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR2019970022239U KR200203121Y1 (en) | 1997-08-14 | 1997-08-14 | Oscillating circuit of power supply in corresponding with sync signal |
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