Time delay controlled switching for a DC/DC converter in a selec

Details Time delay controlled switching for a DC/DC converter in a selec Time delay controlled switching for a DC/DC converter in a selec

1994-02-02

1997-02-25

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

455 383, H04B 116

Patent

active

056067402

ABSTRACT:
A power-supply control circuit comprises a power-supply conversion circuit for converting a primary power-supply voltage into a secondary power-supply voltage; a first switching element for placing the power-supply conversion circuit into an active state or an inactive stage; a capacitor for smoothing the secondary power-supply voltage; a second switching element for placing a load circuit powered by the smoothed secondary power-supply voltage into an active state or an inactive state; and a control circuit for supplying a control mode signal to the first switching element and the second switching element, respectively. A radio select call receiver comprises a radio reception unit driven by a first power-supply voltage for receiving radio carrier waves and identifying a unique call signal conveyed by the radio carrier waves; a signal processing unit performing various kinds of call processing based on the unique call signal; and a power-supply control circuit. The power-supply circuit comprises a power-supply conversion circuit for converting a primary power-supply voltage into a secondary power-supply voltage, a first switching element for placing the power-supply conversion circuit into an active state or an inactive state, a capacitor for smoothing the secondary power-supply voltage, a second switching element for placing a signal processing unit driven by the smoothed secondary power-supply voltage into an active state or an inactive state, and a control circuit for supplying a control mode signal to the first switching element and the second switching element, respectively.

REFERENCES:
patent: 4340973 (1982-07-01), Umetsu
patent: 4634956 (1987-01-01), Davis et al.
patent: 4962349 (1990-10-01), Albach et al.
patent: 5274369 (1993-12-01), Tsunoda et al.

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