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 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;
wherein;
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; and
one minus the duty cycle is equal to a parameter;
wherein 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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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
11 Claims
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1. A system controller for regulating a power converter, the system controller comprising:
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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; wherein; 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; and one minus the duty cycle is equal to a parameter; wherein 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. - View Dependent Claims (2, 4, 5, 6, 7)
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3. A method for regulating a power conversion system, the method comprising:
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generating a drive signal associated with a switching period including an on-time period and an off-time period; and outputting the drive signal to a switch to affect a current flowing through an inductive component; wherein the outputting the drive signal to the switch to affect the current includes; outputting the drive signal to close the switch during the on-time period; and outputting the drive signal to open the switch during the 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 generating the drive signal associated with the switching period includes keeping a multiplication product of the duty cycle, the parameter and the duration of the on-time period approximately constant. - View Dependent Claims (8, 9, 10, 11)
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Specification