Circuit for detecting negative output rails

Details Circuit for detecting negative output rails Circuit for detecting negative output rails

1993-07-12

1996-10-22

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 75, 363 49, 323361, H02M 3335

Patent

active

055683720

ABSTRACT:
A detection circuit for use in an electrical power converter having at least one negative output rail, for detecting the voltage of the negative output rail and for converting the voltage to a positive output voltage. The detection circuit includes an input port for receiving the negative output rail voltage from an electrical power converter, an output port, a ground reference potential, a node having a voltage that is positive with respect to the ground reference potential, and a circuit for generating a measurement current from the node to the ground reference potential. The value of this measurement current is a function of the negative output rail voltage received at the input port. A circuit is further provided for generating an output voltage at the output port that is positive with respect to said ground reference potential and whose value is a function of said measurement current. The detection circuit can be used with conventional pulse-width modulators of switch mode power supplies in order to regulate the value of the negative rail voltage.

REFERENCES:
patent: 4079295 (1978-03-01), den Hollander
patent: 4180852 (1979-12-01), Koizumi et al.
patent: 4980811 (1990-12-01), Suzuji et al.

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