JPH021966U

JPH021966U -

Info

Publication number: JPH021966U
Application number: JP7968388U
Authority: JP
Priority date: 1988-06-16
Filing date: 1988-06-16
Publication date: 1990-01-09

Description

[Brief explanation of drawings]

第１図は本考案による水平偏向コイル切換回路
の一実施例を示すブロツク図、第２図はその波形
説明図、第３図は第１図の本考案による回路の一
部の例を示す図、第４図はこれも本考案による波
形説明図、第５図は従来の偏向コイル切換回路の
例を示すブロツク図、第６図はその波形説明図、
第７図はその一部の具体的な回路の一例を示す図
である。１……水平発振回路、２……励振回路、３……
水平出力回路、４……水平偏向コイル、５……切
換回路、６……遮断回路、７，７′……タイミン
グ回路、８，８′……電磁リレイ、８ａ，８ｂ…
…電磁リレイの巻線、９，９′……リレイ駆動回
路、１１……遅延回路、１０，１２，１３，１４
……単安定マルチバイブレータ、ＣＴ……制御信
号、＋Ｅ……直流電源（電圧）、Ｉｙ……水平偏
向電流、Ｐ……同期信号、Ｓ……切換スイツチ、
Ｓ_１，Ｓ_２，Ｓ_３……切換接点（スイツチ）、Ｖ
ｃｌ……クリアパルス、Ｖｃ′……出力パルス、
Ｖｄ……励振パルス、Ｖｏｓｃ……水平発振パル
ス、Ｖｓｔ……パルス（遮断信号）、Ｖｓｗ，Ｖ
ｓｗ′……パルス（切換信号）、Ｖｔ……切換パ
ルス。 FIG. 1 is a block diagram showing an embodiment of the horizontal deflection coil switching circuit according to the present invention, FIG. 2 is a waveform explanation diagram thereof, and FIG. 3 is a diagram showing a part of the circuit according to the present invention shown in FIG. 1. , FIG. 4 is a waveform explanatory diagram also according to the present invention, FIG. 5 is a block diagram showing an example of a conventional deflection coil switching circuit, and FIG. 6 is a waveform explanatory diagram,
FIG. 7 is a diagram showing an example of a specific circuit of a part thereof. 1...Horizontal oscillation circuit, 2...Excitation circuit, 3...
Horizontal output circuit, 4... Horizontal deflection coil, 5... Switching circuit, 6... Breaking circuit, 7, 7'... Timing circuit, 8, 8'... Electromagnetic relay, 8a, 8b...
...Electromagnetic relay winding, 9, 9'...Relay drive circuit, 11...Delay circuit, 10, 12, 13, 14
...Monostable multivibrator, CT...Control signal, +E...DC power supply (voltage), Iy...Horizontal deflection current, P...Synchronization signal, S...Selector switch,
S ₁ , S ₂ , S ₃ ... Changeover contact (switch), V
cl...clear pulse, Vc'...output pulse,
Vd...Excitation pulse, Vosc...Horizontal oscillation pulse, Vst...Pulse (cutoff signal), Vsw, V
sw'...Pulse (switching signal), Vt...Switching pulse.

Claims

[Claims for Utility Model Registration] (1) A horizontal oscillation circuit, an excitation circuit that amplifies the output of the horizontal oscillation circuit, and a cutoff circuit that blocks the function of supplying the output of the horizontal oscillation circuit to the excitation circuit; A horizontal deflection coil switching circuit comprising a horizontal output circuit excited by the output of the excitation circuit, a horizontal deflection coil connected to the horizontal output circuit, and a switch for switching the connection state of the horizontal deflection coil, means for switching the changeover switch after a time when the supply from the horizontal oscillation circuit to the excitation circuit is cut off; and means for detecting the time when the changeover of the changeover switch is completed, and switching the changeover switch after a certain short time from this detection time; 1. A horizontal deflection coil switching circuit comprising means for restarting supply from said horizontal oscillation circuit to said excitation circuit regardless of the state of a signal for switching. (2) The cutoff circuit in claim 1 determines the time to cut off the supply from the horizontal oscillation circuit to the excitation circuit based on the output of the first monostable multivibrator, and determining a time period during which a drive current for a relay for switching the horizontal deflection coil is applied by a second monostable multivibrator that starts later and has a shorter time constant than the first monostable multivibrator; Furthermore, the horizontal deflection coil switching circuit is characterized in that the first multivibrator output is cleared by a detection signal that electrically detects that the contact point of the relay has been switched from one to the other. (3) The means for electrically detecting the switching of a contact of a relay according to claim 2 is a means for electrically detecting switching of a contact of a relay during a time when the relay movable piece does not touch any contact when the relay is switched. Since the potential of the other movable piece is not transmitted to one of the movable pieces, the phenomenon in which the potential drops is detected as a signal. Furthermore, this potential change triggers the third multivibrator, and the trailing edge of its output pulse is detected as a signal. The horizontal deflection coil switching circuit is characterized in that the first multivibrator is reset by the horizontal deflection coil switching circuit.