Power converter with adaptive voltage positioning controller
First Claim
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1. A converter having an input voltage and providing an output voltage, the converter comprising:
- conversion elements including switching devices, an inductor and a capacitor, wherein the output voltage is available across terminals of the capacitor;
a compensator configured to provide an error voltage in response to the output voltage and a reference voltage;
a pulse width modulator configured to transmit a pulse width modulator signal in response to the error voltage, wherein the pulse width modulator signal has a duty cycle; and
a controller configured to determine a duty cycle value based on the error voltage and to combine the duty cycle value with a predefined constant, thereby providing a combined value, the controller further configured to provide the reference voltage to the compensator, wherein the duty cycle value is indicative of the duty cycle, and wherein the reference voltage is based on the combined value.
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Abstract
A power converter has a controller that uses as input a voltage output of the converter and provides a signal for controlling the duty cycle without the need for current sensing. In one embodiment, the output characteristic of the converter is similar to the output characteristic provided by conventional adaptive voltage positioning (AVP) controllers, but by eliminating the need to sense current, the converter'"'"'s cost, complexity, and power consumption can be reduced.
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Citations
21 Claims
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1. A converter having an input voltage and providing an output voltage, the converter comprising:
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conversion elements including switching devices, an inductor and a capacitor, wherein the output voltage is available across terminals of the capacitor; a compensator configured to provide an error voltage in response to the output voltage and a reference voltage; a pulse width modulator configured to transmit a pulse width modulator signal in response to the error voltage, wherein the pulse width modulator signal has a duty cycle; and a controller configured to determine a duty cycle value based on the error voltage and to combine the duty cycle value with a predefined constant, thereby providing a combined value, the controller further configured to provide the reference voltage to the compensator, wherein the duty cycle value is indicative of the duty cycle, and wherein the reference voltage is based on the combined value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling an output voltage of a converter, comprising:
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applying the output voltage to a compensator; combining a predefined constant and a duty cycle value associated with a pulse width modulator; providing a reference voltage based on the combining; applying the reference voltage to the compensator; generating an error voltage via the compensator in response to the output voltage and the reference voltage; and transmitting a pulse width modulator signal from the pulse width modulator to switching elements of the converter in response to the error voltage. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A power converter, comprising:
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power conversion elements including a switching device, an inductor and a capacitor, the conversion elements for providing an output voltage in response to an input voltage and a pulse width modulator signal having a duty cycle; a pulse width modulator configured to transmit the pulse width modulator signal in response to an error voltage; a compensator configured to receive the output voltage and a reference voltage and to provide the error voltage; and a controller configured to determine, based on the error voltage, a duty cycle value indicative of the duty cycle and to combine the duty cycle value and a predefined constant, thereby providing a combined value the controller further configured to generate the reference voltage based on the combined value. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for converting an input voltage to an output voltage comprising:
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providing a pulse modulator cycle to power conversion elements that receive the input voltage and provide the output voltage, wherein the pulse width modulator signal is based on an error voltage; sensing the output voltage; determining duty cycle value indicative of the duty cycle; combining the duty cycle value and a first predefined constant hereby providing a combined value; providing a reference voltage based on the combining; and generating the error voltage based on the reference voltage and the sensed output voltage. - View Dependent Claims (21)
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Specification