发明授权
- 专利标题: DEFLECTION WITH DAMPING IMPEDANCE COMPENSATION
- 专利标题(中): 具有补偿损失阻抗分心
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申请号: EP97936826.3申请日: 1997-09-08
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公开(公告)号: EP0870399B1公开(公告)日: 2003-03-26
- 发明人: PEETOOM, Johannes, Albertus
- 申请人: Koninklijke Philips Electronics N.V.
- 申请人地址: Groenewoudseweg 1 5621 BA Eindhoven NL
- 专利权人: Koninklijke Philips Electronics N.V.
- 当前专利权人: Koninklijke Philips Electronics N.V.
- 当前专利权人地址: Groenewoudseweg 1 5621 BA Eindhoven NL
- 代理机构: Groenendaal, Antonius Wilhelmus Maria
- 优先权: EP96202856 19961014
- 国际公布: WO98017054 19980423
- 主分类号: H04N3/233
- IPC分类号: H04N3/233 ; H04N9/64 ; H04N3/237
摘要:
A deflection circuit generates a deflection current (If) through a deflection coil (Lf). The deflection circuit comprises a series resistor (Rs) arranged in series with the deflection coil (Lf) to supply a feedback voltage (Vf; Vr), and a drive circuit (1, 5) which has an output coupled to the series arrangement of the deflection coil (Lf) and the series resistor (Rs). The drive circuit (1, 5) has an input coupled to the series resistor (Rs) to receive a feedback voltage (Vs). The drive circuit (1, 5) is further coupled to a conversion resistor (Rc) for receiving an input waveform (Vi). The drive circuit (1, 5) is arranged in a feedback loop to obtain a deflection current (If) with a shape resembling the input waveform (Vi). The deflection circuit further comprises a damping impedance (Rd) arranged in parallel with the deflection coil (Lf), and a current generating circuit (3) for generating a correction current (Ic) within the flyback period (Tf). The current generating circuit (3) is coupled to the conversion resistor (Rc) and/or the series resistor (Rs), and is activated during at least a last part of the flyback period (Tf). In this way the correction current (Ic) can easily be adapted with external components and does not suffer from tolerances in an integrated circuit.
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