Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2007-02-27
2007-02-27
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C323S283000
Reexamination Certificate
active
10914820
ABSTRACT:
A switching frequency jitter having output ripple cancel includes a pattern generator generating a pattern code in response to a clock signal. An oscillator generates an oscillation signal for determining a switching frequency of a switching signal in response to the variation of the pattern code. An attenuator is connected to a voltage feedback loop for attenuating a feedback signal. The feedback signal is utilized to control the pulse width of the switching signal. A programmable resistor is connected to the attenuator for programming an attenuation rate of the attenuator in response to the pattern code. The attenuation rate is increased whenever the switching frequency increases. The pulse width of the switching signal is thus reduced, which compensates the decrease of the switching period and keeps the output power and the output voltage of the power supply constant.
REFERENCES:
patent: 4654770 (1987-03-01), Santurtun et al.
patent: 5590033 (1996-12-01), Kawano
patent: 2004/0092242 (2004-05-01), Endo
Hung Guo-Kiang
Lin Song-Yi
Yang Ta-yung
Han Jessica
System General Corp.
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