Method and System for DC-DC Voltage Converters
First Claim
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1. An apparatus, comprising:
- an error amplifier having a positive input coupled to a reference voltage, and a negative input coupled to an output voltage sense signal;
wherein an output of the error amplifier is coupled to an input of an AC path, an input of a DC path and an input of a gain reduction circuit;
the gain reduction circuit having an input coupled to an output of the AC path;
a beta gain circuit having an input coupled to an output of a summer;
the summer having inputs coupled to an output of the gain reduction circuit, an output of the DC path, and an output of the beta gain circuit; and
wherein the output of the summer is the sum of the signals at the inputs of the summer coupled to the outputs of the gain reduction circuit and the DC path, less the signal at the input of the summer coupled to the output of the beta gain circuit.
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Abstract
On embodiment pertains to a method including determining if an amplitude of an error signal has entered steady state. If the amplitude of the error signal has not entered steady state, then amplify with a high gain the amplitude of the AC component of the error signal. If the amplitude of the error signal has entered steady state, then initiate a timer. Determining if the amplitude of the error signal has remained in steady state while the timer runs. If the amplitude of the error signal has remained in steady state while the timer runs, then amplify with a low gain the amplitude of the AC component of the error signal.
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Citations
23 Claims
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1. An apparatus, comprising:
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an error amplifier having a positive input coupled to a reference voltage, and a negative input coupled to an output voltage sense signal; wherein an output of the error amplifier is coupled to an input of an AC path, an input of a DC path and an input of a gain reduction circuit; the gain reduction circuit having an input coupled to an output of the AC path; a beta gain circuit having an input coupled to an output of a summer; the summer having inputs coupled to an output of the gain reduction circuit, an output of the DC path, and an output of the beta gain circuit; and wherein the output of the summer is the sum of the signals at the inputs of the summer coupled to the outputs of the gain reduction circuit and the DC path, less the signal at the input of the summer coupled to the output of the beta gain circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system comprising:
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a control loop comprising; an error amplifier having a positive input coupled to a reference voltage, and a negative input coupled to an output voltage sense signal; wherein an output of the error amplifier is coupled to an input of an AC path, an input of a DC path and an input of a compensator; the compensator comprising; a gain reduction circuit having inputs coupled to an output of the AC path, and the output of the error amplifier; a beta gain circuit having an input coupled to an output of a summer; a summer having inputs coupled to an output of the gain reduction circuit, an output of the DC path, and an output of the beta gain circuit; and wherein the output of the summer is the sum of the signals at the inputs of the summer coupled to the outputs of the gain reduction circuit and the DC path, less the signal at the input of the summer coupled to the output of the beta gain circuit; a PWM signal generator configured to receive the output of the summer, and having an output configured to provide a PWM signal; and a power stage having an input coupled to an output of the PWM signal generator, and configured to generate the output voltage sense signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method, comprising:
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determining if an amplitude of an error signal has entered steady state; if the amplitude of the error signal has not entered steady state, then amplify with a high gain the amplitude of the AC component of the error signal; if the amplitude of the error signal has entered steady state, then initiate a timer; determining if the amplitude of the error signal has remained in steady state while the timer runs; and if the amplitude of the error signal has remained in steady state while the timer runs, then amplify with a low gain the amplitude of the AC component of the error signal. - View Dependent Claims (20, 21, 22, 23)
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Specification