Power factor controller with error feedback, and a method of operating such a power factor controller
First Claim
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1. A power factor controller comprising:
- an error feedback circuit configured to control an output of the power factor controller, wherein the error feedback circuit comprises;
a first error feedback channel; and
a second error feedback channel, wherein the first error feedback channel and the second feedback channel are configured to operate in parallel and each error feedback channel comprises a separate integrator, andwherein, the integrator in the second error feedback channel comprises a sample and hold circuit configured to periodically sample a difference between a signal indicative of the output of the power factor controller and a reference signal at a predetermined moment.
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Abstract
A power factor controller is disclosed, in which error feedback is provided my means of a parallel combination of at least two error feedback channels. By providing at least two error feedback channels, the stability associated with, for instance, a continuously integrated feedback loop with relatively long time constant, may be combined with a fast transient response associated with, for instance, a sample-and-hold error feedback.
A method of operating such a power factor controller is also disclosed.
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Citations
18 Claims
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1. A power factor controller comprising:
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an error feedback circuit configured to control an output of the power factor controller, wherein the error feedback circuit comprises; a first error feedback channel; and a second error feedback channel, wherein the first error feedback channel and the second feedback channel are configured to operate in parallel and each error feedback channel comprises a separate integrator, and wherein, the integrator in the second error feedback channel comprises a sample and hold circuit configured to periodically sample a difference between a signal indicative of the output of the power factor controller and a reference signal at a predetermined moment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of providing an error feedback signal in a power factor controller operating in voltage control mode, the method comprising:
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providing, in a first channel, a first channel error feedback signal by continuously integrating a difference between a signal indicative of an output of the power factor control and a reference signal; providing, in the second channel, a second channel error feedback signal, wherein the first and second channels use separate integrators; periodically, in the second channel, in the second channel, sampling the difference between the signal indicative of the output of the power factor controller and the reference signal at a predetermined moment; and determining the error feedback signal from the first channel error feedback signal and the second channel error feedback signal. - View Dependent Claims (17)
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18. A power factor controller comprising:
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an error feedback circuit configured to control an output of the power factor controller, wherein the error feedback circuit comprises; a first error feedback channel; a second error feedback channel, wherein the first error feedback channel and the second error feedback channel are configured to operate in parallel and each error feedback channel comprises a separate integrator; and a switch configured to receive a reset signal, wherein the switch is coupled between an output of the integrator in the first error feedback channel and an output of the integrator in the second error feedback channel.
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Specification