DC supply having low and high constant voltages for powering a p

Details DC supply having low and high constant voltages for powering a p DC supply having low and high constant voltages for powering a p

1988-12-12

1989-09-05

Beha, Jr., William H.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323270, 323299, 323901, H02M 3156, G05F 508

Patent

active

048642134

ABSTRACT:
A power supply comprises an inverter circuit for converting an input voltage from a d.c. voltage source to a desired output voltage which is maintained constant under varying current of a load circuit through the feedback operation of an inverter controller. A threshold circuit including a breakdown diode is connected to the d.c. voltage source. The base of a voltage sensing transistor is connected to the breakdown diode for switching to a conducting state when the d.c. voltage exceeds a prescribed level determined by threshold voltages of the breakdown diode and the voltage sensing transistor. A pair of current carrying transistors are connected between the d.c. voltage source and a power supply terminal of the inverter controller. Responsive to the condition of the voltage sensing transistor current is supplied through the current carrying transistors from the d.c. voltage source to the inverter controller. The source voltage supplied to the inverter controller is held at zero volt until the d.c. input voltage rises above the prescribed level and jumps to a high level which is maintained constant by a semiconductor circuit comprising the breakdown diode, the voltage sensing transistor and the current carrying transistors.

REFERENCES:
patent: 3049623 (1962-08-01), Du Vall
patent: 4351021 (1982-09-01), Morihisa et al.
Chetty, "IC Times Control DC-DC Converters", Electronics, Nov. 13, 1975, pp. 121, 122, (323/222).

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