Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-10-28
2000-07-11
Nguyen, Matthew
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, H02M 3335, H02M 324
Patent
active
060882433
ABSTRACT:
A power supply apparatus includes a switching element for relaying electrical current to be supplied to a transformer and a controlling circuit for controlling an operation of said switching element. The controlling circuit has a first oscillator which works to continuously drive the switching element and a second oscillator which works to intermittently operate the switching element. An amount of electrical current to be supplied to the transformer is controlled by changing a duty cycle or an oscillating period of the second oscillator in accordance with a variation of the amount of load current. Further, an initiating resistance for initiating the controlling circuit and a "cut-off" circuit cutting the resistance off: it is arranged such that the resistance is "cut-off" from the controlling circuit after initiating the controlling circuit in order to avoid that a significant amount of current is consumed at the resistance after initiating the circuit.
REFERENCES:
patent: 5063489 (1991-11-01), Inaba
patent: 5325282 (1994-06-01), Bansard
patent: 5675480 (1997-10-01), Stanford
patent: 5859768 (1999-01-01), Hall et al.
patent: 5892672 (1999-04-01), Preller
Fidelix Y.K.
Nguyen Matthew
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