Constant voltage circuit and constant voltage/constant current c

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

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399313, 363 73, 363 97, G05F1/10

Patent

active

059031832

ABSTRACT:
A constant voltage circuit and a constant voltage/constant current changeover circuit hold a voltage, applied to a load, to a constant level regardless of the variation of a load current. To this end, the changeover circuit includes a first circuit with a resistor connected to the output thereof, a second circuit with a pair of resistors serially connected to the output thereof, a compensation resistor connecting one terminal of the resistor to ground, a comparison operation circuit for comparing a detection voltage supplied from the pair of resistors with a reference value, a first oscillation control circuit for controlling the first circuit based on the output from the comparison operation circuit, and a second oscillation control circuit for controlling the second circuit based on the output from the comparison operation circuit. Because a current equal in level to the load current flows in the compensation resistor, the output from the pair of resistors changes depending on the level of the load current. Therefore, the first oscillation control circuit can control the first circuit depending on the variation in the load current.

REFERENCES:
patent: 4727463 (1988-02-01), Suzuki
patent: 4731720 (1988-03-01), Takahashi
patent: 5546172 (1996-08-01), Seto
patent: 5568226 (1996-10-01), Kusano
patent: 5619403 (1997-04-01), Ishikawa et al.
patent: 5623330 (1997-04-01), Ishibashi

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