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