ERROR AMPLIFYING AND FREQUENCY COMPENSATING CIRCUITS AND METHODS
First Claim
1. A compensation circuit for a dc-dc converter, the compensation circuit comprising:
- an amplifier comprising an inverting input coupled to a reference voltage, a non-inverting input coupled to receive a fraction of an output voltage from the dc-dc converter, and an output, wherein the amplifier is operable to generate a first control signal in response to the non-inverting input and inverting input;
a feedback circuit coupled between the amplifier output and the inverting input; and
a subtractor coupled to the reference voltage and the output of the amplifier, wherein the subtractor is operable to receive the first control signal and generate a second control signal, wherein the second control signal is generated by determining a difference of the reference voltage and the first control signal;
wherein the second control signal modulated a duty cycle of the dc-dc converter.
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Accused Products
Abstract
Methods and systems for implementing a closed loop DC-DC converter utilize a compensator to stabilize the output voltage of the DC-DC converter while improving the loop gain in the band of interest. A compensator may be implemented by an operational amplifier and a feedback circuit. The operational amplifier may be configured to receive a fraction of sensed output voltage at the non-inverting terminal and compare the sensed output voltage with the voltage received at the inverting terminal to generate an error signal which is used to determine the duty cycle of a pulse-width modulated signal.
10 Citations
19 Claims
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1. A compensation circuit for a dc-dc converter, the compensation circuit comprising:
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an amplifier comprising an inverting input coupled to a reference voltage, a non-inverting input coupled to receive a fraction of an output voltage from the dc-dc converter, and an output, wherein the amplifier is operable to generate a first control signal in response to the non-inverting input and inverting input; a feedback circuit coupled between the amplifier output and the inverting input; and a subtractor coupled to the reference voltage and the output of the amplifier, wherein the subtractor is operable to receive the first control signal and generate a second control signal, wherein the second control signal is generated by determining a difference of the reference voltage and the first control signal; wherein the second control signal modulated a duty cycle of the dc-dc converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for stabilizing a dc-dc converter, the method comprising:
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receiving a fraction of an output voltage from the dc-dc converter at a non-inverting input of an amplifier; receiving a feedback voltage and a portion of a reference voltage at an inverting input of the amplifier; generating an output signal from the amplifier in response to the fraction of the output voltage from the dc-dc converter; and generating a control signal to modulate a duty cycle of the dc-dc converter via a subtractor based on a voltage difference between the reference voltage and the output signal generated by the amplifier. - View Dependent Claims (13, 14, 15, 16)
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17. A DC-DC boost converter comprising:
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a switch network having a first switching device connected between an inductor and a reference node and a second switching device connected between the inductor and an output capacitor, wherein the first and second switching devices alternate between a conducting state and a blocking state in response to a first binary signal and a second binary signal, respectively; an output low-pass filter having the output capacitor connected between an output node and the reference node; a compensation network operable to generate an output signal in correspondence with an output voltage sensed at the output node, wherein the compensation network comprises an amplifier receiving a fraction of the output voltage at a non-inverting terminal of the amplifier and a feedback circuit connected between an output node of the amplifier and a inverting terminal of the amplifier; and a modulator configured to generate the first and the second binary signals based on a control signal. - View Dependent Claims (18, 19)
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Specification