Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2007-04-10
2007-04-10
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C323S283000
Reexamination Certificate
active
10898389
ABSTRACT:
A switching controller having frequency hopping is used for reducing the EMI of a power supply. A pattern generator generates a digital pattern code in response to a clock signal. An oscillator generates an oscillation signal for determining a switching frequency of a switching signal. A programmable capacitor coupled to the oscillator modulates the switching frequency in response to the variation of the digital pattern code. An attenuator connected to a voltage feedback loop attenuates a feedback signal. The feedback signal controls the pulse width of the switching signal. A programmable resistor coupled to the attenuator determines an attenuation rate of the attenuator in response to the digital pattern code. The attenuation rate is increased as 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 constant.
REFERENCES:
patent: 5590033 (1996-12-01), Kawano
patent: 2004/0092242 (2004-05-01), Endo
Hung Guo-Kiang
Lin Song-Yi
Yang Ta-yung
Han Jessica
J.C. Patents
System General Corp.
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