Voltage regulation loop with variable gain control for inverter circuit
First Claim
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1. A controller for an inverter, the controller comprising:
- an input terminal configured to receive a feedback signal indicative of an output voltage of the inverter;
a voltage regulation loop comprising a voltage conversion circuit and an error amplifier, wherein the feedback signal is provided to an input of the voltage conversion circuit and an output of the voltage conversion circuit is provided to an input of the error amplifier;
a pulse width modulator configured to generate a driving signal to control the output voltage of the inverter based on an output of the error amplifier; and
a gain control block that varies at least one circuit parameter in the voltage conversion circuit or in the error amplifier in response to a clock signal to adjust a gain of the voltage regulation loop independently of frequency changes for the driving signal.
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Abstract
A controller for an inverter provides variable gain control in a voltage regulation loop to prevent overshoot in an output voltage of the inverter. A feedback circuit senses the output voltage and provides a voltage feedback signal to the controller. The controller includes a voltage conversion circuit and an error amplifier as part of the voltage regulation loop. A gain control block varies a circuit parameter in the voltage conversion circuit or the error amplifier such that regulation of the output voltage starts at a relatively lower voltage level and increases smoothly to a desired level.
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Citations
20 Claims
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1. A controller for an inverter, the controller comprising:
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an input terminal configured to receive a feedback signal indicative of an output voltage of the inverter; a voltage regulation loop comprising a voltage conversion circuit and an error amplifier, wherein the feedback signal is provided to an input of the voltage conversion circuit and an output of the voltage conversion circuit is provided to an input of the error amplifier; a pulse width modulator configured to generate a driving signal to control the output voltage of the inverter based on an output of the error amplifier; and a gain control block that varies at least one circuit parameter in the voltage conversion circuit or in the error amplifier in response to a clock signal to adjust a gain of the voltage regulation loop independently of frequency changes for the driving signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method to regulate an output voltage of an inverter, the method comprising:
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providing a feedback signal indicative of the output voltage of the inverter to a voltage regulation loop with variable gain control, wherein the voltage regulation loop comprises a voltage conversion circuit and an error amplifier; generating a pulse width modulated driving signal based on an output of the error amplifier to control the output voltage of the inverter; and adjusting the voltage regulation loop gain independently of the pulse width modulated driving signal'"'"'s frequency to start output voltage regulation at a relatively lower voltage level and to increase the regulated output voltage from the relatively lower voltage level to a relatively higher voltage level in response to a clock signal, wherein the clock signal is based on the feedback signal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An inverter controller comprising:
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means for receiving a feedback signal indicative of an output voltage of an inverter; means for processing the feedback signal to generate a pulse width modulated driving signal to regulate the output voltage of the inverter to a desired regulation level; and means for varying the desired regulation level based on a clock signal and independently of a frequency of the pulse width modulated driving signal. - View Dependent Claims (20)
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Specification