Power supply

Details Power supply Power supply

2005-05-17

2008-10-21

Riley, Shawn (Department: 2838)

Electrical transmission or interconnection systems

Plural load circuit systems

Plural sources of supply

Reexamination Certificate

active

07439633

ABSTRACT:
A switching mode power supply uses two power source inputs, an alternating current input and a direct current input. A pulse width modulation controller is used to control current from two primary windings of a transformer. The secondary of the transformer has a rectified direct current output. From the direct current output a current/voltage comparator receives a signal across a sensing resistor and through an inverter and in parallel with respect to the direct current output. The current/voltage comparator may communicate through an opto coupler/isolator and then to a pulse width modulation controller. Instructions are received about the voltage and current necessary to be supplied by the direct current output of the power supply from an internal, circuit board mounted selecting network. The selecting network can be resistive, digital, fiber optical, black and white, or color.

REFERENCES:
patent: 5297014 (1994-03-01), Saito et al.
patent: 6233165 (2001-05-01), Irissou et al.
patent: 2006/0239044 (2006-10-01), Chen et al.

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