PWM controller having frequency jitter for power supplies

Details PWM controller having frequency jitter for power supplies PWM controller having frequency jitter for power supplies

2006-04-11

2006-04-11

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S175000

Reexamination Certificate

active

07026851

ABSTRACT:
A PWM controller having frequency jitter includes a modulator for generating a first jitter current and a second jitter current. An oscillator generates a pulse signal for producing a switching frequency in response to the modulation of the first jitter current. An attenuator is connected in a voltage feedback loop for attenuating a feedback signal to an attenuated feedback signal, in which the attenuated feedback signal is utilized to control an on-time of a switching signal. A variable-resistance circuit is connected with the attenuator for programming an attenuation rate of the attenuator in response to the modulation of the second jitter current. The switching frequency increases whenever the first jitter current increases. Meanwhile, the impedance of the attenuator will decreases and the attenuation rate will increase whenever the second jitter current increase. The on-time of the switching signal is thus immediately reduced, which compensates the decrease of the switching period and keeps the output power as a constant.

REFERENCES:
patent: 6218820 (2001-04-01), D'Arrigo et al.
patent: 6768657 (2004-07-01), Yang et al.
patent: 6839247 (2005-01-01), Yang et al.

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