Switched-mode power supply having a standby state

Details Switched-mode power supply having a standby state Switched-mode power supply having a standby state

1987-03-10

1988-08-23

Salce, Patrick R.

Electric power conversion systems

Current conversion

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

363 19, H02M 3335

Patent

active

047665289

ABSTRACT:
A switched-mode power supply circuit with having an operating state and a stand-by state in which the value of a first output voltage is considerably lower than in the operating state, whereas the value of a second output voltage is substantially the same. With the aid of a duration-determining circuit (Tr7, Tr8, R17, C12) which is controlled by a switch (Tr6) operative during the stand-by state, a low-frequency burst mode is maintained during this state in which the switch of the supply circuit conducts a number of consecutive times and subsequently becomes non-conductive during a given period. As a result the dissipation in the circuit is reduced.

REFERENCES:
patent: 4167036 (1979-09-01), Kenney
patent: 4322786 (1982-03-01), Weber
patent: 4688159 (1987-08-01), Marinus

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