Constant frequency duty cycle independent synthetic ripple...

Details Constant frequency duty cycle independent synthetic ripple... Constant frequency duty cycle independent synthetic ripple...

2006-12-05

2006-12-05

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

07145317

ABSTRACT:
A synthetic ripple generator that controls conversion of an input voltage to an output voltage while maintaining a relatively constant switching frequency including a ripple capacitor and resistor, a transconductance amplifier circuit, an output error circuit, a frequency control circuit and a hysteretic comparator. The ripple capacitor and resistor develop a ripple voltage. The transconductance amplifier circuit switches, based on a PWM signal, between charging the ripple capacitor based on the input voltage and discharging the ripple capacitor based on the output voltage. The output error circuit provides a compensation voltage indicative of an error of the output voltage. The frequency control circuit develops a ripple window voltage relative to the compensation voltage to adjust switching frequency. The hysteretic comparator has a first input receiving the ripple voltage, a second input receiving the compensation voltage, a third input receiving the ripple window voltage, and an output providing the PWM signal.

REFERENCES:
patent: 6583610 (2003-06-01), Groom et al.
patent: 6791306 (2004-09-01), Walters et al.
patent: 6828766 (2004-12-01), Corva et al.
patent: 6894471 (2005-05-01), Corva et al.
patent: 7019504 (2006-03-01), Pullen et al.
patent: 2005/0017703 (2005-01-01), Walters et al.

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