Switching controller having switching frequency hopping for power converter
First Claim
1. A switching controller having switching frequency hopping for a power converter, comprising:
- a first oscillator, generating a pulse signal and a maximum duty-cycle signal for determining a switching frequency of a switching signal;
a pattern generator with a second oscillator, generating a digital pattern code in response to a clock signal, wherein the clock signal is generated by the second oscillator;
a programmable capacitor, coupled to the pattern generator and the first oscillator for modulating the switching frequency of the switching signal in response to the digital pattern code; and
a PWM circuit, coupled to the first oscillator for generating the switching signal in accordance with the maximum duty-cycle signal, a maximum on-time of the switching signal being limited by the maximum duty-cycle signal, wherein the switching signal is utilized to switch a transformer of the power converter.
5 Assignments
0 Petitions
Accused Products
Abstract
A switching controller having switching frequency hopping for a power converter includes a first oscillator generating a pulse signal and a maximum duty-cycle signal for determining a switching frequency of a switching signal, a pattern generator having a second oscillator and generating a digital pattern code in response to a clock signal, a programmable capacitor coupled to the pattern generator and the first oscillator for modulating the switching frequency of the switching signal in response to the digital pattern code, and a PWM circuit coupled to the first oscillator for generating the switching signal in accordance with the maximum duty-cycle signal. A maximum on-time of the switching signal is limited by the maximum duty-cycle signal. The switching signal is utilized to switch a transformer of the power converter.
11 Citations
7 Claims
-
1. A switching controller having switching frequency hopping for a power converter, comprising:
-
a first oscillator, generating a pulse signal and a maximum duty-cycle signal for determining a switching frequency of a switching signal; a pattern generator with a second oscillator, generating a digital pattern code in response to a clock signal, wherein the clock signal is generated by the second oscillator; a programmable capacitor, coupled to the pattern generator and the first oscillator for modulating the switching frequency of the switching signal in response to the digital pattern code; and a PWM circuit, coupled to the first oscillator for generating the switching signal in accordance with the maximum duty-cycle signal, a maximum on-time of the switching signal being limited by the maximum duty-cycle signal, wherein the switching signal is utilized to switch a transformer of the power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification