# US 2021/0239781 A1 · Method and system for full cycle error correction of inductor current measurement for switching regulators > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0239781 A1 - Document ID: US20210239781A1 - Status: Published application - Kind: A1 - Application number: 17/156,334 - Filed: 2021-01-22 - Published: 2021-08-05 - Earliest claimed: 2020-01-30 - Assignees: Renesas Electronics America Inc. - Applicants: Renesas Electronics America Inc. - Inventors: Michael DING - Web page: https://patentgrep.com/patent/US20210239781A1 ## CPC - G01R 35/005: {Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence)} - H02M 1/0009: {Devices or circuits for detecting current in a converter} - G01R 15/18: using inductive devices, e.g. transformers - H02M 1/0025: {Arrangements for modifying reference values, feedback values or error values in the control loop of a converter} - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - 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 Example implementations include a method of generating a ramp down compensation voltage based at least partially on the a current sense voltage and an inductor voltage of an inductor at an inductor node, applying the ramp down compensation voltage to the inductor node, and in accordance with a first determination that the valley current sense voltage and the inductor voltage are not equal, modifying a predetermined capacitance of a system capacitor operatively coupled to the inductor node to a first modified capacitance. Example implementations also include an apparatus with a ramp-down compensator operable to generate a ramp down compensation voltage based at least partially on the a current sense voltage and an inductor voltage of an inductor at an inductor node, and to apply the ramp down compensation voltage to the inductor node, and a ramp-up compensator including a system capacitor operatively coupled to the inductor node, operatively coupled to the ramp-down compensator, and operable to, in accordance with a first determination that the valley current sense voltage and the inductor voltage are not equal, modify a predetermined capacitance of the system capacitor to a first modified capacitance. ## Claims ### Claim 1 A method of for full cycle error correction of inductor current measurement for switching regulators, the method comprising: generating a ramp down compensation voltage based at least partially on the a current sense voltage and an inductor voltage of an inductor at an inductor node; applying the ramp down compensation voltage to the inductor node; and in accordance with a first determination that the valley current sense voltage and the inductor voltage are not equal, modifying a predetermined capacitance of a system capacitor operatively coupled to the inductor node to a first modified capacitance. ### Claim 2 (depends on 1) The method of claim 1, wherein the first determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is greater than the inductor voltage, and the first modified capacitance is less than the predetermined capacitance of the system capacitor. ### Claim 3 (depends on 1) The method of claim 1, wherein the first determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is less than the inductor voltage, and the first modified capacitance is greater than the predetermined capacitance of the system capacitor. ### Claim 4 (depends on 1) The method of claim 1, further comprising: in accordance with a second determination that the valley current sense voltage and the inductor voltage are not equal, modifying a predetermined capacitance of a system capacitor operatively coupled to the inductor node to a second modified capacitance. ### Claim 5 (depends on 4) The method of claim 4, wherein the second determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is greater than the inductor voltage, and the second modified capacitance is less than the predetermined capacitance of the system capacitor. ### Claim 6 (depends on 4) The method of claim 4, wherein the second determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is less than the inductor voltage, and the modifying the capacitance of the system capacitor comprises increasing the capacitance of the system capacitor. ### Claim 7 (depends on 1) The method of claim 1, further comprising: generating the valley current sense voltage based at least partially on an inductance of the inductor. ### Claim 8 (depends on 1) The method of claim 1, further comprising: obtaining the valley current sense voltage and the inductor voltage within a calibration timing window. ### Claim 9 (depends on 1) The method of claim 1, further comprising: generating a difference voltage based at least partially on the valley current sense voltage and the inductor voltage, wherein the first determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the difference voltage is not equal to zero. ### Claim 10 (depends on 1) The method of claim 1, further comprising: applying a trim voltage to the inductor voltage. ### Claim 11 A apparatus comprising: a ramp-down compensator operable to generate a ramp down compensation voltage based at least partially on the a current sense voltage and an inductor voltage of an inductor at an inductor node, and to apply the ramp down compensation voltage to the inductor node; and a ramp-up compensator including a system capacitor operatively coupled to the inductor node, operatively coupled to the ramp-down compensator, and operable to, in accordance with a first determination that the valley current sense voltage and the inductor voltage are not equal, modify a predetermined capacitance of the system capacitor to a first modified capacitance. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the first determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is greater than the inductor voltage, and the first modified capacitance is less than the predetermined capacitance of the system capacitor. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the first determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is less than the inductor voltage, and the first modified capacitance is greater than the predetermined capacitance of the system capacitor. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the ramp-up compensator is further operable to, in accordance with a second determination that the valley current sense voltage and the inductor voltage are not equal, modify a predetermined capacitance of a system capacitor operatively coupled to the inductor node to a second modified capacitance. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the second determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is greater than the inductor voltage, and the second modified capacitance is less than the predetermined capacitance of the system capacitor. ### Claim 16 (depends on 14) The apparatus of claim 14, wherein the second determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the valley current sense voltage is less than the inductor voltage, and the second modified capacitance is greater than the predetermined capacitance of the system capacitor. ### Claim 17 (depends on 11) The apparatus of claim 11, wherein the ramp-down compensator is further operable to generate the valley current sense voltage based at least partially on an inductance of the inductor. ### Claim 18 (depends on 11) The apparatus of claim 11, wherein the ramp-up compensator is further operable to generate a difference voltage based at least partially on the valley current sense voltage and the inductor voltage, and wherein the first determination that the valley current sense voltage and the inductor voltage are not equal comprises a determination that the difference voltage is not equal to zero. ### Claim 19 (depends on 11) The method of claim 11, further comprising: a translator circuit operatively coupled to the ramp-down compensator and the ramp-up compensator, and operable to apply a trim voltage to the inductor voltage. ### Claim 20 A method of for full cycle error correction of inductor current measurement for switching regulators, the method comprising: generating a ramp down compensation voltage based at least partially on the a current sense voltage and an inductor voltage of an inductor at an inductor node; applying the ramp down compensation voltage to the inductor node; in accordance with a first determination that the valley current sense voltage is greater than the inductor voltage, decreasing a capacitance of a system capacitor operatively coupled to the inductor node; and in accordance with a second determination that the valley current sense voltage is less than the inductor voltage, increasing the capacitance of the system capacitor.