# US 9,882,464 B1 · System for filtering high frequency noise components and an associated method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,464 B1 - Document ID: US9882464B1 - Status: Granted - Kind: B1 - Application number: 15/375,427 - Filed: 2016-12-12 - Granted: 2018-01-30 - Earliest claimed: 2016-12-12 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: Cong Li; Ruxi Wang; Juan Antonio Sabate - Web page: https://patentgrep.com/patent/US9882464B1 ## CPC - H02M 1/126: {using passive filters} - H02M 7/44: by static converters - H02M 1/123: {Suppression of common mode voltage or current} - 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 system including at least one first converter and a filtering unit coupled to the at least one first converter is presented. The filtering unit includes at least one second converter and a plurality of inductors coupled to the at least one second converter. The system further includes a controlling unit operatively coupled to the at least one first converter and the at least one second converter. The controlling unit switches the at least one first converter to generate a first output voltage and the at least one second converter to generate a second output voltage, where the first output voltage and the second output voltage have a substantially same switching pattern. ## Claims ### Claim 1 A system comprising: at least one first converter; a filtering unit coupled to the at least one first converter, wherein the filtering unit comprises: at least one second converter; and a plurality of inductors coupled to the at least one second converter; and a controlling unit operatively coupled to the at least one first converter and the at least one second converter, wherein the controlling unit switches the at least one first converter to generate a first output voltage and the at least one second converter to generate a second output voltage, and wherein the first output voltage and the second output voltage have a substantially same switching pattern. ### Claim 2 (depends on 1) The system of claim 1, wherein the controlling unit switches the at least one first converter at a first frequency and the at least one second converter at a second frequency, and wherein the first frequency and the second frequency have a same measurement unit. ### Claim 3 (depends on 2) The system of claim 2, wherein the first frequency is half of the second frequency. ### Claim 4 (depends on 2) The system of claim 2, wherein the first frequency is twice of the second frequency. ### Claim 5 (depends on 1) The system of claim 1, wherein the filtering unit further comprises a blocking capacitor coupled to the at least one second converter and at least one of the plurality of inductors. ### Claim 6 (depends on 1) The system of claim 1, wherein the plurality of inductors comprises a first coil and at least one second coil operatively coupled to the first coil. ### Claim 7 (depends on 1) The system of claim 1, wherein the at least one first converter is operatively coupled to a load via the filtering unit. ### Claim 8 (depends on 7) The system of claim 7, wherein the filtering unit further comprises a high frequency passive filter coupled to the at least one first converter and the load. ### Claim 9 (depends on 1) The system of claim 1, wherein the filtering unit is a high pass active filter. ### Claim 10 (depends on 1) The system of claim 1, wherein the filtering unit reduces a high frequency noise component generated by the at least one first converter. ### Claim 11 (depends on 1) The system of claim 1, wherein at least one of the at least one first converter and the at least one second converter comprises a plurality of switching units. ### Claim 12 (depends on 11) The system of claim 11, wherein at least one of the plurality of switching units comprises a controllable semiconductor switch. ### Claim 13 An imaging system comprising: a gradient amplifier comprising: at least one first converter; a filtering unit coupled to the at least one first converter, wherein the filtering unit comprises: at least one second converter; and a plurality of inductors coupled to the at least one second converter; a gradient coil coupled to the gradient amplifier via the filtering unit; and a controlling unit operatively coupled to the at least one first converter and the at least one second converter, wherein the controlling unit switches the at least one first converter to generate a first output voltage and the at least one second converter to generate a second output voltage, and wherein the first output voltage and the second output voltage have a substantially same switching pattern. ### Claim 14 (depends on 13) The imaging system of claim 13, wherein the filtering unit comprises a blocking capacitor coupled to the at least one second converter and the plurality of inductors. ### Claim 15 (depends on 13) The imaging system of claim 13, wherein the filtering unit is a high pass active filter. ### Claim 16 (depends on 13) The imaging system of claim 13, wherein the filtering unit reduces a high frequency noise component generated by the at least one first converter. ### Claim 17 (depends on 13) The imaging system of claim 13, wherein the plurality of inductors comprises a first coil and at least one second coil operatively coupled to the first coil. ### Claim 18 (depends on 13) The imaging system of claim 13, wherein the filtering unit provides a filtered electrical output to the gradient coil. ### Claim 19 A method comprising: switching, using a controlling unit, at least one first converter and at least one second converter of a filtering unit to generate a first output voltage and a second output voltage respectively, wherein the first output voltage and the second output voltage have a substantially same switching pattern, and wherein the filtering unit comprises a plurality of inductors coupled to the at least one second converter; generating a filtering component, using the filtering unit, based on the generated second output voltage; subtracting the filtering component from the generated first output voltage; generating a filtered electrical output based on the subtraction of the filtering component from the generated first output voltage; and providing the filtered electrical output to a load operatively coupled to the at least one first converter. ### Claim 20 (depends on 19) The method of claim 19, wherein the first output voltage further comprises a high frequency noise component. ### Claim 21 (depends on 20) The method of claim 20, wherein subtracting the filtering component from the generated first output voltage reduces the high frequency noise component. ### Claim 22 (depends on 19) The method of claim 19, wherein switching the at least one first converter and the at least one second converter comprises switching at least one of a plurality of switching units of at least one of the at least one first converter and the at least one second converter at a substantially same switching frequency.