Systems and methods for regulating output currents of power conversion systems
First Claim
1. A system for a power converter, the system comprising:
- a comparator configured to receive a ramping signal and a compensation signal and output a comparison signal based at least in part on the ramping signal and the compensation signal, the ramping signal being associated with a jittering signal and corresponding to a ramping slope, the jittering signal being associated with multiple jittering cycles corresponding to a predetermined jittering frequency related to a predetermined jittering period, the compensation signal being associated with a current flowing through a primary winding of a power converter; and
a driver configured to generate a drive signal based at least in part on the comparison signal and output the drive signal to a switch to affect the current, the drive signal being associated with multiple modulation cycles corresponding to a modulation frequency related to a modulation period;
wherein the system is further configured to;
change the ramping slope based at least in part on the jittering signal so that, within a same jittering cycle of the multiple jittering cycles, the ramping slope is changed by different magnitudes corresponding to the multiple modulation cycles respectively; and
adjust the modulation frequency based at least in part on the changed ramping slope.
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Accused Products
Abstract
Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.
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Citations
17 Claims
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1. A system for a power converter, the system comprising:
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a comparator configured to receive a ramping signal and a compensation signal and output a comparison signal based at least in part on the ramping signal and the compensation signal, the ramping signal being associated with a jittering signal and corresponding to a ramping slope, the jittering signal being associated with multiple jittering cycles corresponding to a predetermined jittering frequency related to a predetermined jittering period, the compensation signal being associated with a current flowing through a primary winding of a power converter; and a driver configured to generate a drive signal based at least in part on the comparison signal and output the drive signal to a switch to affect the current, the drive signal being associated with multiple modulation cycles corresponding to a modulation frequency related to a modulation period; wherein the system is further configured to; change the ramping slope based at least in part on the jittering signal so that, within a same jittering cycle of the multiple jittering cycles, the ramping slope is changed by different magnitudes corresponding to the multiple modulation cycles respectively; and adjust the modulation frequency based at least in part on the changed ramping slope. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for a power converter, the system comprising:
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a comparator configured to receive a ramping signal and a compensation signal and output a comparison signal based at least in part on the ramping signal and the compensation signal, the ramping signal being associated with a random jittering signal and corresponding to a ramping slope, the compensation signal being associated with a current flowing through a primary winding of a power converter; and a driver configured to generate a drive signal based at least in part on the comparison signal and output the drive signal to a switch to affect the current, the drive signal being associated with multiple modulation cycles corresponding to a modulation frequency related to a modulation period; wherein the system is further configured to; change the ramping slope based at least in part on the random jittering signal so that the ramping slope is changed by random magnitudes corresponding to the multiple modulation cycles respectively; and adjust the modulation frequency based at least in part on the ramping slope changed by the random magnitudes. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for a power converter, the method comprising:
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receiving a ramping signal and a compensation signal, the ramping signal being associated with a jittering signal and corresponding to a ramping slope, the jittering signal being associated with multiple jittering cycles corresponding to a predetermined jittering frequency related to a predetermined jittering period, the compensation signal being associated with a current flowing through a primary winding of a power converter; outputting a comparison signal based at least in part on the ramping signal and the compensation signal; generating a drive signal based at least in part on the comparison signal; and outputting the drive signal to a switch to affect the current, the drive signal being associated with multiple modulation cycles corresponding to a modulation frequency related to a modulation period; wherein the generating a ramping signal includes; changing the ramping slope based at least in part on the jittering signal so that, within a same jittering cycle of the multiple jittering cycles, the ramping slope is changed by different magnitudes corresponding to the multiple modulation cycles respectively; wherein the changing the ramping slope is performed to adjust the modulation frequency based at least in part on the changed ramping slope.
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17. A method for a power converter, the method comprising:
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receiving a ramping signal and a compensation signal, the ramping signal being associated with a random jittering signal and corresponding to a ramping slope, the compensation signal being associated with a current flowing through a primary winding of a power converter; generating a comparison signal based at least in part on the ramping signal and the compensation signal; generating a drive signal based at least in part on the comparison signal; and outputting the drive signal to a switch to affect the current, the drive signal being associated with multiple modulation cycles corresponding to a modulation frequency related to a modulation period; wherein the generating a ramping signal includes; changing the ramping slope based at least in part on the random jittering signal so that the ramping slope is changed by random magnitudes corresponding to the multiple modulation cycles respectively; wherein the changing the ramping slope is performed to adjust the modulation frequency based at least in part on the ramping slope changed by the random magnitudes.
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Specification