Single feedback loop for parallel architecture buck converter—LDO regulator
First Claim
1. A voltage regulation circuit comprising:
- a direct current to direct current (DC-DC) converter configured to control a first current provided from a source to a load via a first output;
a linear regulator configured to control a second current provided from the source to the load via a second output;
a single control loop configured to receive an output voltage across the load and a first reference voltage, the single control loop being further configured to generate a single error signal between the output voltage across the load and the first reference voltage and to control the DC-DC converter and the linear regulator using the single error signal such that when the single error signal is outside of a predetermined range the DC-DC converter provides the first current to the load and the linear regulator provides the second current to the load simultaneously;
wherein the single control loop comprises an integrator configured to receive the output voltage and the first reference voltage, the integrator further configured to integrate an error between the output voltage and the first reference voltage to generate the single error signal; and
wherein the linear regulator comprises a differential amplifier having a negative input configured to receive the single error signal from the integrator and a positive input configured to receive a second reference voltage.
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Accused Products
Abstract
An embodiment of a voltage regulation circuit includes a DC-DC converter configured to control a first current provided from a source to a load via a first output, and a linear regulator configured to control a second current provided from the source to the load via a second output. The voltage regulation circuit further includes a single control loop configured to receive an output voltage across the load and a first reference voltage. The single control loop is further configured to generate a single error signal between the output voltage across the load and the first reference voltage and to control the DC-DC converter and the linear regulator using the single error signal such that when the single error signal is outside of a predetermined range the DC-DC converter provides the first current to the load and the linear regulator provides the second current to the load simultaneously.
34 Citations
18 Claims
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1. A voltage regulation circuit comprising:
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a direct current to direct current (DC-DC) converter configured to control a first current provided from a source to a load via a first output; a linear regulator configured to control a second current provided from the source to the load via a second output; a single control loop configured to receive an output voltage across the load and a first reference voltage, the single control loop being further configured to generate a single error signal between the output voltage across the load and the first reference voltage and to control the DC-DC converter and the linear regulator using the single error signal such that when the single error signal is outside of a predetermined range the DC-DC converter provides the first current to the load and the linear regulator provides the second current to the load simultaneously;
wherein the single control loop comprises an integrator configured to receive the output voltage and the first reference voltage, the integrator further configured to integrate an error between the output voltage and the first reference voltage to generate the single error signal; andwherein the linear regulator comprises a differential amplifier having a negative input configured to receive the single error signal from the integrator and a positive input configured to receive a second reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of regulating voltage delivered to a load comprising:
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controlling, by a direct current to direct current (DC-DC) converter, a first current provided from a source to a load via a first output; controlling, by a linear regulator, a second current provided from the source to the load via a second output;
wherein controlling the second current by the linear regulator comprises;receiving a single error signal at a negative input of a differential amplifier; and receiving a second reference voltage at a positive input of the differential amplifier, the second reference voltage being equal to the maximum value of a periodic signal plus a predetermined threshold value; receiving, by a single control loop, an output voltage across the load and a first reference voltage; generating, by the single control loop, a single error signal between the output voltage across the load and the first reference voltage;
wherein generating the single error signal comprises;receiving the output voltage and the first reference voltage; and integrating an error between the output voltage and the first reference voltage to generate the single error signal; and controlling the DC-DC converter and the linear regulator using the single error signal such that when the single error signal is outside of a predetermined range the DC-DC converter provides the first current to the load and the linear regulator provides the second current to the load simultaneously. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification