Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device
Patent
1979-03-12
1981-06-09
Shoop, William M.
Electricity: power supply or regulation systems
In shunt with source or load
Using a three or more terminal semiconductive device
323276, 320 1, G05F 1613
Patent
active
042727170
ABSTRACT:
In accordance with this invention, the capacitor is discharged through a transistor connected as a negative resistance device so that the current through it increases as the voltage across the capacitor decreases. Means are provided for biasing the transistor to cut-off while the output voltage is being regulated at the selected value, but the bias is removed so as to permit the transistor to conduct and discharge the capacitor under certain conditions, such as (1) when the voltage is programmed downward; (2) when an overvoltage condition exists; or (3) when the line voltage to which the power supply is connected fails or is turned off. In the latter situation, a capacitor supplies operating power to the circuit for a long enough time to permit it to fully discharge the capacitor. In accordance with another aspect of the invention, the time during which the transistor is permitted to conduct is limited so as to permit more current to flow without damaging the transistor and thereby discharge the capacitor more quickly.
REFERENCES:
patent: 3781642 (1973-12-01), Dutton
patent: 3819983 (1974-06-01), Bjork
patent: 4127895 (1978-11-01), Krueger
patent: 4153871 (1979-05-01), Loucks
patent: 4167767 (1979-09-01), de Mere
Hewlett--Packard Company
Shoop William M.
Timbie Donald N.
Wong Peter S.
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