# US 12,191,767 B2 · Apparatus and method for applying dynamic compensation to feedback signal generated from loadline of voltage regulator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,767 B2 - Document ID: US12191767B2 - Status: Granted - Kind: B2 - Application number: 17/719,401 - Filed: 2022-04-13 - Published: 2022-12-08 - Granted: 2025-01-07 - Earliest claimed: 2021-06-02 - Assignees: MediaTek Singapore Pte. Ltd. - Applicants: MediaTek Singapore Pte. Ltd. - Inventors: Man Pun Chan; Hao-Ping Hong; Yung-Chih Yen; Chien-Hui Wang; Cheng-Hsuan Fan; Jian-Rong Huang - Web page: https://patentgrep.com/patent/US12191767B2 ## CPC - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H02M 3/1566: {with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation} - H02M 1/0009: {Devices or circuits for detecting current in a converter} - H02M 1/0016: {Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract A feedback loop circuit of a voltage regulator includes a loadline and a compensation circuit. The loadline generates a feedback signal according to a sensed current signal that provides information of an inductor current of the voltage regulator, and outputs the feedback signal to a controller circuit of the voltage regulator for regulating an output voltage of the voltage regulator. The compensation circuit generates a compensation signal to compensate for a deviation of the output voltage, wherein the feedback signal generated from the loadline is affected by the compensation signal. ## Claims ### Claim 1 A feedback loop circuit of a voltage regulator comprising: a loadline, arranged to generate a feedback signal according to a sensed current signal that provides information of an inductor current of the voltage regulator, and output the feedback signal to a controller circuit of the voltage regulator for regulating an output voltage of the voltage regulator; and a compensation circuit, arranged to generate a compensation signal to compensate for a deviation of the output voltage, wherein in response to a specific event that results in disturbance of the inductor current, the compensation circuit is arranged to make the feedback signal remain unchanged by injecting the compensation signal to the feedback signal generated from the load line. ### Claim 2 (depends on 1) The feedback loop circuit of claim 1, wherein the compensation circuit comprises: a compensation current generator circuit, arranged to generate a compensation current; and a filter circuit, arranged to apply filtering to the compensation current to generate the compensation signal. ### Claim 3 (depends on 1) The feedback loop circuit of claim 1, wherein the compensation circuit is arranged to generate the compensation signal in response to the specific event that leads to the deviation of the output voltage. ### Claim 4 (depends on 3) The feedback loop circuit of claim 3, wherein the compensation circuit is arranged to generate the compensation signal during a period in which a load current supplied from the voltage regulator to a load is unchanged. ### Claim 5 (depends on 3) The feedback loop circuit of claim 3, wherein the specific event is a dynamic voltage identification (DVID) event that changes the output voltage from a first voltage setting to a second voltage setting. ### Claim 6 (depends on 5) The feedback loop circuit of claim 5, wherein the compensation circuit is arranged to determine the compensation signal according to capacitance of an output capacitor of the voltage regulator and a slew rate of changing the output voltage from the first voltage setting to the second voltage setting. ### Claim 7 (depends on 3) The feedback loop circuit of claim 3, wherein the voltage regulator is a multi-phase voltage regulator, and the specific event is a phase number change event. ### Claim 8 (depends on 7) The feedback loop circuit of claim 7, wherein the phase number change event changes a number of phases enabled in the voltage regulator from a first phase number to a second phase number, and the compensation circuit is arranged to set the compensation signal according to a difference between the first phase number and the second phase number. ### Claim 9 (depends on 7) The feedback loop circuit of claim 7, wherein the compensation circuit is arranged to control timing of generating the compensation signal according to triggering of pulse-width modulation (PWM) pulse since the phase number change event. ### Claim 10 (depends on 3) The feedback loop circuit of claim 3, wherein the specific event is an operation mode transition event. ### Claim 11 (depends on 10) The feedback loop circuit of claim 10, wherein the operation mode transition event comprises transition between a continuous conduction mode (CCM) and a discontinuous conduction mode (DCM). ### Claim 12 (depends on 10) The feedback loop circuit of claim 10, wherein the compensation circuit is arranged to control timing of generating the compensation signal according to triggering of pulse-width modulation (PWM) pulse since the operation mode transition event. ### Claim 13 A compensation method employed by a voltage regulator comprising: according to a sensed current signal that provides information of an inductor current of the voltage regulator, generating a feedback signal through a loadline; generating a compensation signal to compensate for a deviation of an output voltage of the voltage regulation, wherein in response to a specific event that results in disturbance of the inductor current, the compensation signal is injected to the feedback signal generated from the load line, and makes the feedback signal remain unchanged; and outputting the feedback signal to a controller circuit of the voltage regulator for regulating the output voltage. ### Claim 14 (depends on 13) The compensation method of claim 13, wherein generating the compensation signal to compensate for the deviation of the output voltage comprises: generating the compensation signal in response to the specific event that leads to the deviation of the output voltage. ### Claim 15 (depends on 14) The compensation method of claim 14, wherein the specific event is a dynamic voltage identification (DVID) event that changes the output voltage from a first voltage setting to a second voltage setting. ### Claim 16 (depends on 14) The compensation method of claim 14, wherein the voltage regulator is a multi-phase voltage regulator, and the specific event is a phase number change event. ### Claim 17 (depends on 14) The compensation method of claim 14, wherein the specific event is an operation mode transition event. ### Claim 18 (depends on 17) The compensation method of claim 17, wherein the operation mode transition event comprises transition between a continuous conduction mode (CCM) and a discontinuous conduction mode (DCM).