Constant voltage circuits

Details Constant voltage circuits Constant voltage circuits

1984-09-14

1986-08-26

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323303, 323231, G05F 144

Patent

active

046085297

ABSTRACT:
A constant voltage circuit has two rails 10 and 12, with one rail 12 at a variable potential V, possibly supplied by a voltaic cell. In one arm between the rails there is voltage reference means Z1, 14, with a circuit output line 16 connected thereto, and the line 16 is required to be maintained at a potential V.sub.o, corresponding to a maximum value for V. In a second arm there is provided a first resistor R1, connected to the rail 12, and in series with a transistor T2. A second, equal, resistor R2 is connected between the output line 16 and the transistor T2. Means Z2, 30, T3, causes a potential, corresponding to the variable, decreasing, potential V, to be applied between the second resistor R2 and the transistor T2. The current to the transistor T2 is constant over a wide range dV for V, by a compensating current portion dI flowing through the second resistor R2, thereby maintaining V.sub. o constant. Usually, current gain means, such as a transistor T1, is provided, in the first arm, between the output line 16 and the rail 12.

REFERENCES:
patent: 4352056 (1982-09-01), Cave et al.
patent: 4459538 (1984-07-01), Arai et al.

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