Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1994-05-31
1995-03-21
Stephan, Steven L.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
G05F 140
Patent
active
053999584
ABSTRACT:
A switching power supply circuit comprising a switching element receiving an electric power from an primary power supply for outputting the received electric power, a smoothing circuit receiving an output of the switching element, a voltage divider receiving a smoothed electric power outputted from the switching element for generating a voltage signal, a comparator having a first input receiving the voltage signal and a second input receiving a reference voltage, for generating a comparison result signal indicating whether or not the voltage signal is larger than the reference voltage, an AND circuit receiving the comparison result signal and a reference oscillation signal, a driver circuit receiving a logical signal from the AND circuit for driving the switching element on the basis of the logical signal, and a feedback circuit receiving the logical signal for feeding back the logical signal to the first input of the comparator. Thus, the ON and OFF of the switching element are alternately performed in each one cycle of the reference oscillation frequency while maintaining a stable switching duty, so that the output voltage can be maintained substantially constant, with a minimized output voltage ripple.
REFERENCES:
patent: 4161771 (1979-07-01), Bates
patent: 4302717 (1981-11-01), Olla
patent: 4553082 (1985-11-01), Nesler
patent: 4743864 (1988-05-01), Nakagawa et al.
Motorola Inc., Linear/Switchmode Voltage Regulator Handbook, 4th Edition, 1989.
NEC Corporation
Nguyen Matthew V.
Stephan Steven L.
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