JPH05313592A - Power source circuit - Google Patents
Power source circuitInfo
- Publication number
- JPH05313592A JPH05313592A JP4115796A JP11579692A JPH05313592A JP H05313592 A JPH05313592 A JP H05313592A JP 4115796 A JP4115796 A JP 4115796A JP 11579692 A JP11579692 A JP 11579692A JP H05313592 A JPH05313592 A JP H05313592A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- horizontal deflection
- switching frequency
- noise
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Details Of Television Scanning (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は２種類以上の水平偏向周
波数を受信可能なディスプレイ、モニタ装置の電源回路
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for a display or monitor device capable of receiving two or more horizontal deflection frequencies.
【０００２】[0002]
【従来の技術】従来の技術は、特開昭５８−１０９６８
の記載のようにコントロール、ドライブ回路から出力さ
れる単一周波数のパルスによりスイッチングを行うか、
またはＲＣＣ（リンギング チョーク コンバータ）電
源回路のように出力電力によりスイッチング周波数は可
変した。2. Description of the Related Art A conventional technique is disclosed in JP-A-58-10968.
Control, as described in, switching by a single frequency pulse output from the drive circuit,
Alternatively, the switching frequency was changed by the output power as in the RCC (ringing choke converter) power supply circuit.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術は電源回
路のスイッチング周波数と水平偏向周波数の干渉につい
ての配慮がされておらず、２種類以上の水平偏向周波数
を受信する場合に、画面上にノイズが生じる問題があっ
た。The above-mentioned prior art does not take into consideration the interference between the switching frequency of the power supply circuit and the horizontal deflection frequency, and when two or more types of horizontal deflection frequencies are received, noise on the screen appears. There was a problem that occurs.
【０００４】本発明は水平偏向周波数に選らず画面上に
ノイズが生じないことを目的としており、さらに、ノイ
ズのない明瞭な画質を提供することにある。It is an object of the present invention to prevent noise from being generated on the screen regardless of the horizontal deflection frequency, and further to provide clear image quality without noise.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、電源回路のスイッチング周波数を、水平偏向周波数
により、切換え可能とし、ノイズが生じないようにした
ものである。To achieve the above object, the switching frequency of the power supply circuit can be switched by the horizontal deflection frequency so that noise is not generated.
【０００６】[0006]
【作用】電源回路のスイッチング周波数は抵抗とコンデ
ンサの時定数により設定する。スイッチング周波数設定
用抵抗の抵抗値を水平偏向周波数をＦ−Ｖ（周波数−電
圧）変換した電圧により制御、切換えすることで、画面
上にノイズとして現れないスイッチング周波数に可変す
るように動作する。[Function] The switching frequency of the power supply circuit is set by the time constant of the resistor and the capacitor. The resistance value of the switching frequency setting resistor is controlled and switched by a voltage obtained by FV (frequency-voltage) conversion of the horizontal deflection frequency, so that the switching frequency is changed so as not to appear as noise on the screen.
【０００７】[0007]
【実施例】以下、本発明の一実施例を図１により説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
【０００８】端子１、端子２に印加された交流電圧はダ
イオード３、コンデンサ４により整流されトランス５の
一次巻線に加えられる。一次巻線の他端にはトランジス
タ６のコレクタ端子が接続されており、コンデンサ７、
抵抗８および抵抗９の時定数により、パルス発生／ドラ
イブ回路１０で発生したスイッチングパルスをトランジ
スタ６のベース端子に印加することでスイッチングし、
トランス５の二次巻線、三次巻線に出力する。ここでダ
イオード１１、コンデンサ１２、ダイオード１３、コン
デンサ１４は、二次巻線および三次巻線の整流出力用で
ある。The AC voltage applied to the terminals 1 and 2 is rectified by the diode 3 and the capacitor 4 and applied to the primary winding of the transformer 5. The collector terminal of the transistor 6 is connected to the other end of the primary winding, and the capacitor 7,
Switching is performed by applying the switching pulse generated in the pulse generation / drive circuit 10 to the base terminal of the transistor 6 according to the time constants of the resistors 8 and 9.
Output to the secondary winding and the tertiary winding of the transformer 5. Here, the diode 11, the capacitor 12, the diode 13, and the capacitor 14 are for rectified output of the secondary winding and the tertiary winding.
【０００９】スイッチング周波数の切換えは、端子１５
に入力された水平偏向周波数をＦ−Ｖ変換回路１６で電
圧に変換する。その電圧が一定電圧に達したところで、
比較器１７が動作しリレー１８が切断され、スイッチン
グ周波数設定用の抵抗９が開放され時定数が変化し、ス
イッチング周波数の切換えが出来る。スイッチング周波
数設定用のコンデンサ７、抵抗８、抵抗９を予め水平偏
向周波数との干渉によるノイズが出ないように設定して
おけば、異なる水平偏向周波数を受信した場合でも画面
上にノイズが発生せず、明瞭な画質にすることが出来
る。Switching of the switching frequency is performed by the terminal 15
The horizontal deflection frequency input to is converted into a voltage by the FV conversion circuit 16. When the voltage reaches a certain level,
The comparator 17 operates, the relay 18 is cut off, the switching frequency setting resistor 9 is opened, the time constant is changed, and the switching frequency can be switched. If the switching frequency setting capacitors 7, resistors 8 and 9 are set in advance so that noise due to interference with the horizontal deflection frequency does not occur, noise will be generated on the screen even when different horizontal deflection frequencies are received. Instead, clear image quality can be achieved.
【００１０】[0010]
【発明の効果】本発明によれば、電源回路のスイッチン
グ周波数を水平偏向周波数変化とともに可変することが
できるので、水平偏向周波数によらず画面上にノイズが
発生せず、明瞭な画質にできる効果がある。According to the present invention, since the switching frequency of the power supply circuit can be changed along with the change of the horizontal deflection frequency, noise is not generated on the screen regardless of the horizontal deflection frequency, and clear image quality can be obtained. There is.
【図１】本発明の一実施例である電源回路の回路図であ
る。FIG. 1 is a circuit diagram of a power supply circuit that is an embodiment of the present invention.
１…交流電圧入力端子、 ２…交流電圧入力端子、 ３…整流用ダイオード、 ４…整流用コンデンサ、 ５…絶縁トランス、 ６…スイッチングトランジスタ、 ７…スイッチング周波数設定用コンデンサ、 ８…スイッチング周波数設定用抵抗、 ９…スイッチング周波数設定用抵抗、 １０…パルス発生／ドライブ回路、 １１…整流用ダイオード、 １２…整流用コンデンサ、 １３…整流用ダイオード、 １４…整流用コンデンサ、 １５…水平偏向周波数入力端子、 １６…Ｆ−Ｖ変換回路、 １７…比較器、 １８…リレー。 1 ... AC voltage input terminal, 2 ... AC voltage input terminal, 3 ... Rectifying diode, 4 ... Rectifying capacitor, 5 ... Isolation transformer, 6 ... Switching transistor, 7 ... Switching frequency setting capacitor, 8 ... Switching frequency setting Resistor, 9 ... Switching frequency setting resistor, 10 ... Pulse generating / drive circuit, 11 ... Rectifying diode, 12 ... Rectifying capacitor, 13 ... Rectifying diode, 14 ... Rectifying capacitor, 15 ... Horizontal deflection frequency input terminal, 16 ... F-V conversion circuit, 17 ... comparator, 18 ... relay.
Claims (1)
ディスプレイ、モニタ装置において、水平偏向周波数に
合わせスイッチング周波数切換え機能を設けたことを特
徴とする電源回路。1. A power supply circuit comprising a display and a monitor capable of receiving two or more kinds of horizontal deflection frequencies and having a switching frequency switching function according to the horizontal deflection frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4115796A JPH05313592A (en) | 1992-05-08 | 1992-05-08 | Power source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4115796A JPH05313592A (en) | 1992-05-08 | 1992-05-08 | Power source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05313592A true JPH05313592A (en) | 1993-11-26 |
Family
ID=14671294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4115796A Pending JPH05313592A (en) | 1992-05-08 | 1992-05-08 | Power source circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05313592A (en) |
-
1992
- 1992-05-08 JP JP4115796A patent/JPH05313592A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |