Systems and methods for output current regulation in power conversion systems
First Claim
1. A system controller for regulating a power converter, the system controller comprising:
- a first controller terminal configured to provide a compensation signal based on at least information associated with a first current flowing through an inductive winding of a power converter;
a ramp current generator configured to receive a modulation signal, the compensation signal and a first reference signal and generate a ramp current based at least in part on the modulation signal, the compensation signal and the first reference signal;
a ramp signal generator configured to receive the ramp current and generate a ramping signal based at least in part on the ramp current; and
a modulation signal generator configured to receive the ramping signal and the compensation signal and generate the modulation signal based at least in part on the ramping signal and the compensation signal, the modulation signal being related to a drive signal, the drive signal being associated with a switching period including an on-time period and an off-time period;
wherein;
a duty cycle is equal to a duration of the on-time period divided by a duration of the switching period; and
one minus the duty cycle is equal to a parameter;
wherein the ramp current generator is further configured to generate the ramp current approximately proportional in magnitude to a multiplication product of the duty cycle, the parameter and a difference, the difference representing the first reference signal minus the compensation signal in magnitude.
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Accused Products
Abstract
Systems and methods are provided for regulating a power converter. An example system controller includes: a driver configured to output a drive signal to a switch to affect a current flowing through an inductive winding of a power converter, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed in response to the drive signal during the on-time period. The switch is opened in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. One minus the duty cycle is equal to a parameter. The system controller is configured to keep a multiplication product of the duty cycle, the parameter and the duration of the on-time period approximately constant.
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Citations
19 Claims
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1. A system controller for regulating a power converter, the system controller comprising:
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a first controller terminal configured to provide a compensation signal based on at least information associated with a first current flowing through an inductive winding of a power converter; a ramp current generator configured to receive a modulation signal, the compensation signal and a first reference signal and generate a ramp current based at least in part on the modulation signal, the compensation signal and the first reference signal; a ramp signal generator configured to receive the ramp current and generate a ramping signal based at least in part on the ramp current; and a modulation signal generator configured to receive the ramping signal and the compensation signal and generate the modulation signal based at least in part on the ramping signal and the compensation signal, the modulation signal being related to a drive signal, the drive signal being associated with a switching period including an on-time period and an off-time period; wherein; a duty cycle is equal to a duration of the on-time period divided by a duration of the switching period; and one minus the duty cycle is equal to a parameter; wherein the ramp current generator is further configured to generate the ramp current approximately proportional in magnitude to a multiplication product of the duty cycle, the parameter and a difference, the difference representing the first reference signal minus the compensation signal in magnitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for regulating a power converter, the method comprising:
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providing a compensation signal based on at least information associated with a first current flowing through a primary winding of a power converter; receiving a modulation signal, the compensation signal and a reference signal; generating a ramp current based at least in part on the modulation signal, the compensation signal and the reference signal; receiving the ramp current; generating a ramping signal based at least in part on the ramp current; receiving the ramping signal and the compensation signal; and generating the modulation signal based at least in part on the ramping signal and the compensation signal, the modulation signal being related to a drive signal, the drive signal being associated with a switching period including an on-time period and an off-time period; wherein; a duty cycle is equal to a duration of the on-time period divided by a duration of the switching period; and a parameter is equal to one minus the duty cycle; wherein the generating the ramp current based at least in part on the modulation signal, the compensation signal and the reference signal includes generating the ramp current approximately proportional in magnitude to a multiplication product of the duty cycle, the parameter and a difference, the difference representing the reference signal minus the compensation signal in magnitude. - View Dependent Claims (19)
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Specification