Power supply system
AssigneeRicoh Company, Ltd.
InventorsAtsuo Tokunaga, Masahide Nakaya
Life of this patent
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Abstract
A first power source for providing a positive voltage and a second power source for providing a negative voltage are selectively activated to supply a positive or a negative voltage to a load. A rectifying element is connected between the first and second power sources to prevent electric current from flowing through the second power source when only the first power source is active. A switch and a resistor for generating a feedback current are connected in series with an output terminal of the first power source and a terminal of the load. The switch is opened to prevent current flow through the resistor when only the second power supply is active.
Claims8
A power supply system comprising:
- a first power source having a first terminal of a first polarity to be connected to a first terminal of a given load, and a second terminal of a second polarity to be connected to a second terminal of said given load via a switching element,
- said switching element connecting said second terminal of said first power source with said second terminal of said given load when said first power source is active;
- a second power source having a first terminal of the second polarity to be connected to said second terminal of said first power source via a rectifying element, and a second terminal of the first polarity to be connected to said second terminal of said given load;
- and
- a first resistance element connected between said first and second terminals of said first power source;
- wherein
- said rectifying element allows an electric current to substantially flow along one direction according to said second and first polarities of said first and second terminals of said second power source though said given load, said first resistance element and said rectifying element when said second power source is instead active.
The power supply system according to 1, further comprising a second resistance element inserted between said second terminal of said second power source and said second terminal of said given load, a voltage at a connection point between said second terminal of said second power source and said second resistance element being used for detecting an electric current flowing through said second resistance element so as to detect output powers of said first and second power sources respectively.
Dependencies are inferred from the claim text.