Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1988-09-19
1989-08-08
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323283, 363 41, 363 56, G05F 1569
Patent
active
048556653
ABSTRACT:
A keep-alive circuit for a regulated switched-type power supply for forcing the power supply to generate power pulses under conditions where the apparent output voltage level is such as to cause the regulator circuit normally to reduce the power pulses effectively to zero. The keep-alive circuitry responds to the absence of the power pulses over a predetermined time interval to modify the regulating circuit so that the regulating circuit responds to a different output voltage level to force the power supply to generate a power pulse under the aforesaid conditions. The action is made cyclic and the power supply is thereby caused to generate a series of low frequency power pulses indicating that it is still alive.
REFERENCES:
patent: 3824450 (1974-07-01), Johnson et al.
patent: 4074182 (1978-02-01), Weischedel
patent: 4194147 (1980-03-01), Payne et al.
patent: 4359679 (1982-11-01), Regan
Beecher Keith D.
Pioneer Magnetics, Inc.
Wong Peter S.
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