Power supply switching apparatus

Details Power supply switching apparatus Power supply switching apparatus

1993-12-30

1996-06-25

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Diverse or unlike electrical characteristics

307 64, 307150, 320 2, H02J 700

Patent

active

055302963

ABSTRACT:
A power supply switching apparatus for switching power supplies used to all electronic appliance such as a pager and a portable telephone is described. A battery pack includes a battery and is connectable to an external DC power supply. In the battery pack, a power supply connection detecting circuit detects whether or not the external DC power supply is connected to this battery pack, and a switching circuit switches the battery and the external DC power supply. In an appliance housing a voltage is detected by a voltage detecting circuit to judge whether the detected voltage corresponds to the voltage derived from the battery power supply, or the voltage derived from the external DC power supply, and another switching circuit switches the battery power supply and a power stabilizing circuit. Both of these battery pack and appliance housing constitute the power supply switching apparatus.

REFERENCES:
patent: 4590943 (1986-05-01), Paull et al.
patent: 4675538 (1987-06-01), Epstein
patent: 4709201 (1987-11-01), Schaefer et al.
patent: 5019767 (1991-05-01), Shirai et al.
patent: 5191229 (1993-03-01), Davis et al.
patent: 5287053 (1994-02-01), Hutchinson
patent: 5347163 (1994-09-01), Yoshimura
patent: 5381043 (1995-01-01), Kohiyama et al.
patent: 5404090 (1995-04-01), Shinbori

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