Fast response pulse width modulation control for switching regulator
First Claim
Patent Images
1. A switching rectifier circuit comprising:
- a voltage input coupled to a positive amplification device and a negative amplification device, the positive amplification device and the negative amplification device coupled in series;
a voltage output node on a common output of the positive amplification device and the negative amplification device;
a pulse width modulation controller coupled to the positive amplification device and the negative amplification device, the pulse width modulation controller including a set input and a reset input;
a voltage switching circuit having a voltage switching circuit output and a clock signal input;
a pulse width modulation comparator coupled between the voltage switching circuit output and the pulse width modulation controller;
an error amplifier having an error amplifier output coupled to the pulse width modulation comparator;
a voltage reference having an output coupled to the error amplifier;
a high threshold voltage comparator including;
a high threshold voltage reference;
a first high threshold voltage comparator input coupled to the high threshold voltage reference;
a second high threshold voltage comparator input coupled to the output voltage; and
a high threshold voltage comparator output coupled to the pulse width modulation controller reset input;
a low threshold voltage comparator including;
a low threshold voltage reference;
a first low threshold voltage comparator input coupled to the low threshold voltage reference;
a second low threshold voltage comparator input coupled to the output voltage; and
a low threshold voltage comparator output coupled to the pulse width modulation controller set input.
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Abstract
A switching rectifier circuit includes a pulse width modulation controller, a voltage switching circuit, a pulse width modulation comparator, an error amplifier, a voltage reference, a high threshold voltage comparator and a low threshold voltage comparator. A varying output voltage of the voltage regulator is sampled and compared to a high threshold voltage reference and a low threshold voltage reference. When the sampled output voltage is equal to or greater than the high threshold voltage reference the output voltage is decreased. When the sampled output voltage is equal to or less than the low threshold voltage reference the output voltage is increased.
12 Citations
20 Claims
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1. A switching rectifier circuit comprising:
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a voltage input coupled to a positive amplification device and a negative amplification device, the positive amplification device and the negative amplification device coupled in series; a voltage output node on a common output of the positive amplification device and the negative amplification device; a pulse width modulation controller coupled to the positive amplification device and the negative amplification device, the pulse width modulation controller including a set input and a reset input; a voltage switching circuit having a voltage switching circuit output and a clock signal input; a pulse width modulation comparator coupled between the voltage switching circuit output and the pulse width modulation controller; an error amplifier having an error amplifier output coupled to the pulse width modulation comparator; a voltage reference having an output coupled to the error amplifier; a high threshold voltage comparator including; a high threshold voltage reference; a first high threshold voltage comparator input coupled to the high threshold voltage reference; a second high threshold voltage comparator input coupled to the output voltage; and a high threshold voltage comparator output coupled to the pulse width modulation controller reset input; a low threshold voltage comparator including; a low threshold voltage reference; a first low threshold voltage comparator input coupled to the low threshold voltage reference; a second low threshold voltage comparator input coupled to the output voltage; and a low threshold voltage comparator output coupled to the pulse width modulation controller set input. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of regulating a voltage comprising:
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sampling a varying output voltage of the voltage regulator; comparing the sampled output voltage to a high threshold voltage reference; decreasing the output voltage of the voltage regulator when the sampled output voltage is equal to or greater than the high threshold voltage reference wherein decreasing the output voltage includes increasing a pulse width modulating ramp signal; and increasing the output voltage of the voltage regulator when the sampled output voltage is equal to or less than the low threshold voltage reference wherein increasing the output voltage includes decreasing the pulse width modulating ramp signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A switching regulator circuit comprising:
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a pulse width modulation controller having a high control input and a low control input; a high threshold voltage comparator circuit having a first output coupled to the high control input, the high threshold voltage comparator circuit configured to compare a high threshold voltage reference and an output voltage of the switching regulator and output a reset signal to the high control input of the pulse width modulation controller when the output voltage is equal to or greater than the high threshold voltage reference wherein the set signal includes increasing a pulse width modulating ramp signal; and a low threshold voltage comparator circuit having a second output coupled to the low control input, the low threshold voltage comparator circuit configured to compare a low threshold voltage reference and the output voltage and output a set signal to the low control input of the pulse width modulation controller when the output voltage is equal to or less than the low threshold voltage reference wherein the reset signal includes decreasing the pulse width modulating ramp signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification