Systems and methods for peak current adjustments in power conversion systems
First Claim
1. A system for regulating a power converter, the system comprising:
- a modulation and drive signal generator configured to;
generate a drive signal based at least in part on a signal selected from a group consisting of a first signal and a second signal, the first signal indicating a magnitude of an input voltage, the second signal indicating a magnitude of a current flowing through a primary winding of a power converter; and
output the drive signal to a switch to affect the current;
wherein the modulation and drive signal generator is further configured to, in response to an output voltage of the power converter being regulated in a constant-voltage mode,in response to an output current of the power converter falling within a first predetermined range, generate, without taking into account the magnitude of the current flowing through the primary winding, a modulation signal based at least in part on the magnitude of the input voltage, the modulation signal being the drive signal; and
in response to the output current falling within a second predetermined range, generate, without taking into account the magnitude of the input voltage, the modulation signal based at least in part on the magnitude of the current, the modulation signal being the drive signal.
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Accused Products
Abstract
System and method for regulating an output of a power conversion system. An example system controller includes a signal generator and a modulation and drive component. The signal generator is configured to receive at least a first signal indicating a magnitude of an input voltage received by a primary winding of a power conversion system and receive a second signal indicating a magnitude of a primary current flowing through the primary winding, and generate a third signal. The modulation and drive component is configured to receive at least the third signal, generate a drive signal based on at least information associated with the third signal, and output the drive signal to a switch to affect the primary current.
154 Citations
63 Claims
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1. A system for regulating a power converter, the system comprising:
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a modulation and drive signal generator configured to; generate a drive signal based at least in part on a signal selected from a group consisting of a first signal and a second signal, the first signal indicating a magnitude of an input voltage, the second signal indicating a magnitude of a current flowing through a primary winding of a power converter; and output the drive signal to a switch to affect the current; wherein the modulation and drive signal generator is further configured to, in response to an output voltage of the power converter being regulated in a constant-voltage mode, in response to an output current of the power converter falling within a first predetermined range, generate, without taking into account the magnitude of the current flowing through the primary winding, a modulation signal based at least in part on the magnitude of the input voltage, the modulation signal being the drive signal; and in response to the output current falling within a second predetermined range, generate, without taking into account the magnitude of the input voltage, the modulation signal based at least in part on the magnitude of the current, the modulation signal being the drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for regulating a power converter, the system comprising:
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a modulation and drive signal generator configured to; generate a drive signal based at least in part on a first signal, the first signal indicating a magnitude of an input voltage received by a primary winding of a power converter; and output the drive signal to a switch to affect a current flowing through the primary winding; wherein the modulation and drive signal generator is further configured to; in response to an output voltage of the power converter being regulated in a constant-voltage mode and in response to an output current of the power converter falling within a first predetermined range, generate a pulse-width-modulation signal, the pulse-width-modulation signal being the drive signal, the pulse-width-modulation signal corresponding to a pulse width and a modulation frequency; and decrease the pulse width in response to the input voltage increasing and in response to the output voltage and the output current remaining constant. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A system for regulating a power converter, the system comprising:
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a first comparator configured to receive a first signal and a second signal associated with a feedback signal of a power converter and generate a first comparison signal based at least in part on the first signal and the second signal, the first signal indicating a magnitude of an input voltage; a second comparator configured to receive the first signal and a threshold signal and generate a second comparison signal based at least in part on the first signal and the threshold signal; and a drive signal generator configured to receive the first comparison signal and the second comparison signal, generate a drive signal based at least in part on a signal selected from a group consisting of the first comparison signal and the second comparison signal, and output the drive signal to a first switch to affect a current flowing through a primary winding of the power converter; wherein the drive signal generator is further configured to; in response to the second signal being larger than the threshold signal in magnitude, output the drive signal to close the first switch in response to the first signal being smaller than the second signal; and in response to the threshold signal being larger than the second signal in magnitude, output the drive signal to close the first switch in response to the first signal being smaller than the threshold signal. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A method for regulating a power converter, the method comprising:
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receiving a first signal indicating a magnitude of an input voltage; receiving a second signal indicating a magnitude of a current flowing through a primary winding of a power converter; generating a drive signal based at least in part on a signal selected from a group consisting of the first signal and the second signal; and outputting the drive signal to affect the current; wherein the generating a drive signal based at least in part on the first signal and the second signal includes;
in response to an output voltage of the power converter being regulated in a constant-voltage mode,in response to an output current of the power converter falling within a first predetermined range, generating, without taking into account the magnitude of the current, a modulation signal based at least in part on the magnitude of the input voltage, the modulation signal being the drive signal; and in response to the output current falling within a second predetermined range, generating, without taking into account the magnitude of the input voltage, the modulation signal based at least in part on the magnitude of the current, the modulation signal being the drive signal. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. A method for regulating a power converter, the method comprising:
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receiving a first signal indicating a magnitude of an input voltage; generating a drive signal based at least in part on the first signal; and outputting the drive signal to affect a current flowing through a primary winding of a power converter; wherein the generating a drive signal based at least in part on the first signal includes; in response to an output voltage of the power converter being regulated in a constant-voltage mode and in response to an output current of the power converter falling within a first predetermined range, generating a pulse-width-modulation signal, the pulse-width-modulation signal being the drive signal, the pulse-width-modulation signal corresponding to a pulse width and a modulation frequency; and decreasing the pulse width in response to the input voltage increasing and in response to the output voltage and the output current remaining constant. - View Dependent Claims (59, 60, 61, 62)
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63. A method for regulating a power converter, the method comprising:
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generating a first comparison signal based at least in part on a first signal and a second signal, the first signal indicating a magnitude of an input voltage, the second signal being associated with a feedback signal of a power converter; generating a second comparison signal based at least in part on the first signal and a threshold signal; generating a drive signal based at least in part on a signal selected from a group consisting of the first comparison signal and the second comparison signal; and outputting the drive signal to affect a current flowing through a primary winding of the power converter; wherein the outputting the drive signal to affect a current flowing through a primary winding of the power converter includes; in response to the second signal being larger than the threshold signal in magnitude, outputting the drive signal to close a switch in response to the first signal being smaller than the second signal; and in response to the threshold signal being larger than the second signal in magnitude, outputting the drive signal to close the switch in response to the first signal being smaller than the threshold signal.
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Specification