Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-06-30
1999-02-16
Nguyen, Matthew
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 21, H02M 3335
Patent
active
058727043
ABSTRACT:
A low voltage supply cutoff process and circuit for terminating supply of electric power less than a required minimum voltage to a monitor or a computer system in order to prevent malfunction of the appliance. The circuit may be constructed with a power supply unit is used for rectifying an input alternating current voltage (AC voltage) to a direct current voltage (DC voltage); a switching unit for supplying the DC voltage provided by the power supply unit to the electronic appliance on the basis of a switching signal; a voltage detecting unit for detecting a voltage level applied by the switching unit to the electronic appliance; an overvoltage detecting unit for detecting whether the switching unit supplies an overvoltage to the electronic appliance; a low voltage detecting unit for comparing the output voltages of the power supply unit and the voltage detecting unit in order to determine whether the input AC voltage of the power supply unit is a low voltage with an amplitude less than a predetermined voltage level; a control unit for generating a switching control signal according to the voltage level detected by the voltage detecting unit and generating a switching disenable signal when the overvoltage detecting unit detects the overvoltage or the low voltage detecting unit detects the low voltage; and an oscillating unit for generating the switching signal to operate the switching unit by being oscillated according to the switching control signal and for terminating the switching signal by stopping oscillation when the switching disenable signal is generated.
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Bushnell Esq. Robert E.
Nguyen Matthew
Samsung Electronics Co,. Ltd.
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