Pulse width modulation controller operational in both current an

Details Pulse width modulation controller operational in both current an Pulse width modulation controller operational in both current an

1998-06-09

2000-07-04

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327175, H03K 3017, H03K 504, H03K 708

Patent

active

060844515

ABSTRACT:
A pulse width modulation controller is shown which includes an error amplifier, a multiplying portion, an oscillator, a comparator, a flop-flop and a logic gate. The error amplifier receives an externally input feedback voltage and a first reference voltage in order to compare each voltage, and, in a current mode, the multiplying portion outputs a voltage which is proportional to the multiplication product of a voltage generated from a power switching unit and the difference between a second reference voltage and a voltage output from the error amplifier, and, in a voltage mode, outputs a voltage which is proportional to the multiplication product of a ground voltage and the difference between the second reference voltage and the voltage output from the error amplifier. The oscillator generates a clock signal and an inverse sawtooth signal. The comparator compares the inverse sawtooth signal with the output voltage of the multiplying portion. The flip-flop outputs a logic low signal when the clock signal and the output voltage of the comparator are a logic high and a logic low, respectively, and outputs a logic low signal when the clock signal and the output voltage of the comparator are a logic low and a logic high, respectively. Also, the logic gate controls the power switching unit by outputting a logic low signal when either the clock signal or the output of the flip-flop is a logic high, and by outputting a logic high signal when the clock signal and the output of the flip-flop are both logic low.

REFERENCES:
patent: 5045991 (1991-09-01), Dhyanchand et al.
patent: 5452198 (1995-09-01), Jessee
patent: 5894243 (1999-04-01), Hwang

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