Apparatus and method for providing a programmable DC voltage

Details Apparatus and method for providing a programmable DC voltage Apparatus and method for providing a programmable DC voltage

1995-12-21

1997-04-22

Nguyen, Matthew V.

Electricity: power supply or regulation systems

Output level responsive

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

G05F 156

Patent

active

056231989

ABSTRACT:
A switching regulator circuit comprises a drive circuit, a switching transistor, an output stage and a pre-drive circuit that are coupled in series. The pre-drive circuit is coupled to the drive circuit to apply a pre-drive signal which varies the duty cycle and frequency of a series of drive pulses which activate and deactivate the switching transistor thereby adjusting a voltage of the switching regulator circuit. The pre-drive circuit utilizes a comparator in combination with a hysteresis network to vary the oscillation frequency of the pre-drive signal.

REFERENCES:
patent: 3660753 (1972-05-01), Judd et al.
patent: 3809999 (1974-05-01), Smith
patent: 4456872 (1984-06-01), Froeschle
patent: 5266884 (1993-11-01), Agiman
patent: 5481178 (1996-01-01), Wilcox et al.

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