POWER CONVERTER AND METHOD FOR REGULATING LINE TRANSIENT RESPONSE OF THE POWER CONVERTER
First Claim
1. A power converter, comprising:
- an input;
an output;
an energy storage circuit;
a power switching circuit coupled between the input and the output;
a feedback circuit coupled between the output and a ground and configured to generate a feedback voltage;
an error amplifier circuit configured to generate an error amplification signal based on the feedback voltage;
a comparator circuit configured to generate a control signal for controlling turn on and turn off of the power switching circuit based on a first comparison signal related to the error amplification signal and a second comparison signal related to a charging current of the energy storage circuit; and
a regulating circuit coupled between an output of the error amplifier circuit and an input of the comparator circuit for receiving the first comparison signal, the regulating circuit is configured to couple a voltage compensation signal related to an input voltage received by the input to an output of the error amplifier, so as to reduce a variation amount of the error amplification signal when the input voltage varies.
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Accused Products
Abstract
A power converter includes an input and an output with an energy storage circuit and a power switching circuit coupled between the input and the output. A feedback circuit generates a feedback voltage which is differentially compared to a reference in an error amplifier circuit to generate an error amplification signal. A comparator circuit generates a control signal for controlling on/off of the power switching circuit based on a first comparison signal related to the error amplification signal and a second comparison signal related to a charging current of the energy storage circuit. A regulating circuit is coupled between an output of the error amplifier circuit and an input of the comparator circuit for receiving the first comparison signal, the regulating circuit is configured to couple a voltage compensation signal related to an input voltage received by the input to an output of the error amplifier, so as to reduce a variation amount of the error amplification signal when the input voltage varies.
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Citations
20 Claims
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1. A power converter, comprising:
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an input; an output; an energy storage circuit; a power switching circuit coupled between the input and the output; a feedback circuit coupled between the output and a ground and configured to generate a feedback voltage; an error amplifier circuit configured to generate an error amplification signal based on the feedback voltage; a comparator circuit configured to generate a control signal for controlling turn on and turn off of the power switching circuit based on a first comparison signal related to the error amplification signal and a second comparison signal related to a charging current of the energy storage circuit; and a regulating circuit coupled between an output of the error amplifier circuit and an input of the comparator circuit for receiving the first comparison signal, the regulating circuit is configured to couple a voltage compensation signal related to an input voltage received by the input to an output of the error amplifier, so as to reduce a variation amount of the error amplification signal when the input voltage varies. - 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 method for regulating line transient response for a power converter, wherein the power converter comprises an input, an output, and an energy storage circuit and a power switching circuit coupled between the input and the output, the method comprising:
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generating a feedback voltage based on an output voltage from the output; generating an error amplification signal based on the feedback voltage; generating a control signal for controlling on/off of the power switching circuit based on a first comparison signal related to the error amplification signal and a second comparison signal related to a charging current of the energy storage circuit; and coupling a voltage compensation signal related to an input voltage received by the input to the error amplification signal, so as to reduce a variation amount of the error amplification signal when the input voltage varies.
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20. A circuit, comprising:
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an inductor coupled between an input node and an intermediate node; a first switch coupled between the intermediate node and a reference node; a second switch coupled between the intermediate node and an output node; a first voltage sensor configured to sense voltage at the output node and generate a feedback voltage; an amplifier configured to compare the feedback voltage to a reference voltage to generate a difference voltage; a second voltage sensor configured to sense voltage at the input node and generate an adjustment voltage; a summation circuit configured to subtract the adjustment voltage from the difference voltage to generate a compensating voltage; a current sensor configured to sense current in the inductor and generate a sense signal; a comparator circuit configured to compare the sense signal to the compensating voltage to generate a pulse width modulated control signal; and a driver circuit operating in response to the pulse width modulated control signal to control on and off actuation of the first and second switches.
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Specification