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Power supply circuit of a television receiver used in a automobile

  • US 4,660,135 A
  • Filed: 07/05/1985
  • Issued: 04/21/1987
  • Est. Priority Date: 07/05/1984
  • Status: Expired due to Term
First Claim
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1. A power supply circuit of a TV receiver in a car using a storage battery of 12 volts or of 24 volts as a power source, comprising:

  • switching circuit means switched on at 24 volts and switching off a first constant voltage circuit which is turned on at 12 volts to output a first constant voltage;

    a second constant voltage circuit turned on at said 24 volts to output a second constant voltage;

    a horizontal drive circuit driven by said first and second constant voltage circuits to apply a horizontal oscillatory signal to a horizontal output circuit; and

    a booster circuit boosting the output voltage from said first constant voltage circuit up to a booster voltage and then applying it to the horizontal output circuit through the primary coil of a high voltage transformer and also applying the output voltage from said second constant voltage circuit to the horizontal output circuit directly through the primary coil of said high voltage transformer, thereby making it possible to use the storage batteries of 12 volts and 24 volts in common.

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