Switching controller having frequency hopping for power supplies
First Claim
1. A switching controller having frequency hopping, comprising:
- a clock generator, for generating a clock signal;
a pattern generator, for generating a digital pattern code in response to said clock signal;
an oscillator, for determining a switching frequency of a switching signal, wherein said switching signal is utilized to regulate an output of a power supply, and wherein said switching signal is synchronized with said clock signal;
a programmable capacitor, coupled to said oscillator for modulating said switching frequency in response to said digital pattern code;
an attenuator, coupled to a voltage feedback loop for attenuating a feedback signal, wherein said feedback signal is utilized to control the pulse width of said switching signal; and
a programmable resistor, connected to said attenuator for programming an attenuation rate of said attenuator in response to said digital pattern code.
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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.
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Citations
7 Claims
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1. A switching controller having frequency hopping, comprising:
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a clock generator, for generating a clock signal;
a pattern generator, for generating a digital pattern code in response to said clock signal;
an oscillator, for determining a switching frequency of a switching signal, wherein said switching signal is utilized to regulate an output of a power supply, and wherein said switching signal is synchronized with said clock signal;
a programmable capacitor, coupled to said oscillator for modulating said switching frequency in response to said digital pattern code;
an attenuator, coupled to a voltage feedback loop for attenuating a feedback signal, wherein said feedback signal is utilized to control the pulse width of said switching signal; and
a programmable resistor, connected to said attenuator for programming an attenuation rate of said attenuator in response to said digital pattern code. - View Dependent Claims (2, 3, 4)
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5. A switching controller having frequency hopping, comprising:
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a clock generator, for generating a clock signal;
a pattern generator, for generating a digital pattern code in response to said clock signal;
an oscillator, for determining a switching frequency of a switching signal, wherein said switching signal is utilized to regulate an output of a power supply, and wherein said switching signal is synchronized with said clock signal;
a programmable capacitor, coupled to said oscillator for modulating said switching frequency in response to said digital pattern code;
- View Dependent Claims (6, 7)
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Specification