Battery or AC driven radio receiver power supply
AssigneeGeneral Electric Company
InventorRaymond F. Hanson
Life of this patent
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Abstract
In a radio receiver adapted to be operable from an AC source or a battery, the battery is connected in series with radio circuits and a silicon transistor which operates as a switch. The receiver includes a circuit which responds to an AC source to make DC voltage available to the radio circuits and to keep the transistor in an off state. When the radio is not connected to an AC source and the receiver is turned on, the silicon transistor is driven fully on. Since only a small voltage drop exists across the transistor, energy is efficiently transferred to the radio circuits.
Claims14
A power supply circuit for supplying power to an audio electronic circuit alternatively from an A.C. source or a battery comprising:
- a switch having first and second terminals, said second terminal having means for coupling to said audio electronic circuit;
- a first transistor having collector, base and emitter electrodes,
- a contact for engaging a battery terminal being selectably coupled by said emitter and collector electrodes of said first transistor to said switch first terminal;
- a first diode for coupling the switch first terminal to a means for supplying A.C. potential;
- means coupled between said switch second terminal and said first transistor base for turning said first transistor fully on when said switch is closed.
An electrical power supply circuit operable from either A.C. or D.C. power source, comprising a switch having a second terminal adapted for connection to a load and a first terminal adapted for parallel connection to an A.C. circuit branch and a D.C. circuit branch,
- a first controllable electronic means connected in said D.C. branch between said switch first terminal and a contact for connection to said D.C. source said first controllable electronic means having a control electrode;
- circuit means for supplying a first potential during A.C. operation and a second potential during D.C. operation, including a second controllable electronic means coupled to said control electrode of said first electronic means, said second electronic means includes a control electrode connected to said switch second terminal for receiving a turn on bias potential whenever said load receives power,
- whereby said first potential turns said first electronic means off and said second potential turns said first electronic means on.
Dependencies are inferred from the claim text.