High-efficiency, low-voltage-drop series regulator using as its

Details High-efficiency, low-voltage-drop series regulator using as its High-efficiency, low-voltage-drop series regulator using as its

1984-04-02

1985-12-24

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

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

323268, 323281, G05F 156

Patent

active

045609187

ABSTRACT:
A highly efficient series regulator for use where output voltage may closely approach input voltage uses the channel of a field effect transistor as a series voltage-dropping element. The conduction of the channel of the field effect transistor is controlled without consumption of appreciable power in the control circuitry for the transistor. Presently available power field effect transistors are of p-channel enhancement mode type. Their threshold voltages are sufficiently high as to make difficult the closing a d.c. feedback loop as will allow output voltage to approach closely input voltage. This problem of closing the d.c. feedback loop is overcome by using voltage boost circuitry, powered from the input voltage supply to the regulator, against which to refer the error signal applied to the gate electrode of the field effect transistor.

REFERENCES:
patent: 2984779 (1961-05-01), Klees
patent: 4291266 (1981-09-01), Portmann
Chetty et al., "DC-DC Power Supply Regulates Down to 0 Volt," Electronics, vol. 51, No. 2, p. 111 (U.S.A.), (Jan. 19, 1978).
M. A. Wyatt, "JFET Minimizes Regulator Differential, Extends Battery Life, Electr. Design, vol. 28, No. 24, pp. 302, 304 (USA) (Nov. 22, 1980).
Prasad, "MOS Power FET Make Excellent Voltage Regulators," Electr. Eng., vol. 51, No. 61, p. 23 (USA) (Feb. 1979).
Tang, "Discrete Regulator Design Regulates Close to Supply Bus," Electr. Design, vol. 28, No. 16, p. 102 (USA), (Aug. 2, 1980).

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