Source voltage control switching circuit

Details Source voltage control switching circuit Source voltage control switching circuit

1992-07-10

1994-08-23

Powell, Mark R.

Television

Receiver circuitry

Power supply

348728, 363 21, 455 32, 455140, H04N 563

Patent

active

053411790

ABSTRACT:
In a BS (direct broadcast by satellite) timer recording mode, a constant voltage diode for controlling 18 V is directly inserted in a power circuit. Alternatively, a delay circuit is inserted at the input of a switching circuit for switching the constant voltage diode, thus absorbing the switching time difference between 140-V control and 18-V control. Therefore, the secondary side output voltages can be prevented from being increased, and the output voltages can be stabilized both in the BS timer recording mode (light load powering) and in the television mode (maximum load powering).

REFERENCES:
patent: 4595977 (1986-06-01), van der Ohe
patent: 4903130 (1990-02-01), Kitagawa et al.
patent: 5227964 (1993-07-01), Furuhata

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