发明公开
- 专利标题: Vertical deflection circuit
- 专利标题(中): Vertikal-Ablenkschaltung。
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申请号: EP87303081.1申请日: 1987-04-09
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公开(公告)号: EP0242124A1公开(公告)日: 1987-10-21
- 发明人: Sutherland, Hugh Ferrar II
- 申请人: RCA LICENSING CORPORATION
- 申请人地址: 2 Independence Way Princeton New Jersey 08540 US
- 专利权人: RCA LICENSING CORPORATION
- 当前专利权人: RCA LICENSING CORPORATION
- 当前专利权人地址: 2 Independence Way Princeton New Jersey 08540 US
- 代理机构: Kennington, Eric Alasdair
- 优先权: US852358 19860415
- 主分类号: H04N3/16
- IPC分类号: H04N3/16 ; H04N9/29
摘要:
A vertical deflection amplifier (20) of a video display apparatus includes first (Q1) and second (Q2) transistor amplifier output stages arranged in a totem-pole, push-pull configuration. A vertical deflection winding (Lv) is coupled to the output stages at a deflection amplifier output terminal (22). An S-capacitor (C1) is coupled to the deflection winding (L v ) at a second terminal (21) remote from the output terminal (22). A source (23) of deflection rate signals is coupled to the deflection amplifier (20) for generating a deflection current (iv) in the deflection winding (Lv). A base current generating circuit (40) is coupled to one (Q1) of the transistor amplifier output stages for providing base current (i 1) thereto. The S-capacitor voltage (V1) is applied to the base current generating circuit (40) for enabling conduction of base current (i1) in the one amplifier output stage (Q1). When the video display apparatus is first turned on, the initially discharged S-capacitor (C1) is slowly charged from a DC voltage supply (+30V) to delay generation of vertical deflection past completion of picture tube degaussing.
公开/授权文献
- EP0242124B1 Vertical deflection circuit 公开/授权日:1991-09-04
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