Switching power supply with auxiliary power supply device for in

Details Switching power supply with auxiliary power supply device for in Switching power supply with auxiliary power supply device for in

1999-12-07

2000-10-10

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 56, 363 95, H02M 3335, H02M 744, H02H 7122

Patent

active

061308269

ABSTRACT:
A switching power supply is provided which is capable of supplying a stable voltage to a control circuit with high precision so as to enable an electronic part that does not have a high voltage tolerance to be used in the control circuit, and which enhances efficiency by providing a circuit configuration with a reduced power loss. The auxiliary power supply circuit of the switching power supply is configured such that, to a primary power supply, a series circuit including a first resistor, a voltage element, and a Zener diode; and a series circuit including a second resistor, a first transistor, a second transistor; and a control circuit of a switching element, are connected in parallel to each other. The input terminal of the first transistor is connected to the connection point of the first resistor and the voltage element, the input terminal of the second transistor is connected to the connection point of the voltage element and the Zener diode. The auxiliary power supply that operates the control circuit during steady-state is connected between the connection point of the first transistor and the second transistor and the reference terminal of the primary power supply.

REFERENCES:
patent: 4441147 (1984-04-01), Schwarz
patent: 4710795 (1987-12-01), Yamada et al.
patent: 4722041 (1988-01-01), Ishikawa
patent: 4942508 (1990-07-01), Nakamura
patent: 5392206 (1995-02-01), Peterson et al.
patent: 5631811 (1997-05-01), Huh

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