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专利名称：Voltage regulator in a television apparatus发明人：Joseph C. Stephens,Enrique Rodriguez-Cavazos
申请号：US07/265846申请日：19881101公开号：US05013980A公开日：19910507
摘要：An input signal at a horizontal frequency is coupled to a deflection circuitthrough an isolation transformer during a power-on operation but not during a power-off operation. A voltage at a horizontal deflection frequency is developed in a linearityinductor of the deflection circuit. The voltage in the linearity inductor is rectified toproduce a rectified signal that is coupled to an input terminal of a regulator oscillator ofa power supply. The rectified signal is coupled to the regulator oscillator in anelectrically nonisolated manner with respect to electrical shock hazard isolation and iselectrically isolated by the transformer from the input signal. The regulator oscillatorgenerates trigger pulses for controlling the switching operation of an SCR switch of thepower supply to produce an output supply voltage that energizes the deflection circuit.The regulator oscillator is energized during both power-up and power-off operation andis responsive to the rectified signal to cause the duty cycle of an output signal of theoscillator to increase during power-off operation. The increased duty cycle causes theanode-to-cathode voltage of the SCR switch to be small enough to prevent latching ofthe SCR switch during the power-off operation. By preventing SCR switch latching, audibleparasitic vibrations in the power supply are avoided.
申请人：THOMSON CONSUMER ELECTRONICS, INC.
代理人：Joseph S. Tripoli,Joseph J. Laks,Sammy S. Henig
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