Dual slope pulse width modulation regulator and control system

Details Dual slope pulse width modulation regulator and control system Dual slope pulse width modulation regulator and control system

1981-09-08

1983-05-31

Shoop, William M.

Electricity: power supply or regulation systems

Output level responsive

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

363 21, 363 71, 363 97, G05F 146

Patent

active

043863116

ABSTRACT:
A dual slope pulse width modulation regulator for separate control of two independently operative power supplies is provided. An oscillator supplies a triangle wave having a period T signal to each of two separate DC comparators each of which also receives an analog error signal related to the difference between a power supply output signal and a predetermined reference level. The outputs of the DC comparators are coupled to a pair of AND gates which are alternately enabled by a digital output signal of the oscillator with the digital output signal having output states corresponding to the duration of first and second rates of change of the triangle wave signal which occur during each period T. The outputs of the AND gates correspond to pulse width modulated drive signals which are utilized to control the excitation of independently operative power supplies having output sensor circuits which sample the output of the power supplies and result in providing the first and second analog error signals. During each period T separate, independently operative pulse width modulation power supply control signals are provided through the alternate use of the first and second rates of change of the triangle wave signal of the oscillator to provide pulse width modulation control signals.

REFERENCES:
patent: 4322785 (1982-03-01), Walker
"Motorola Linear Integrated Circuits" handbook, published 1979, pp. 4-107 to 4-125 and 6-44 to 6-50.
"Signetics Analog Data Manual 1979" published 1979, pp. 110 to 117.

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