# US 12,761,297 B2 · Power supply adjustment method, power supply apparatus, portable component and magnetic resonance device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,761,297 B2 - Document ID: US12761297B2 - Status: Granted - Kind: B2 - Application number: 18/071,840 - Filed: 2022-11-30 - Published: 2023-06-01 - Granted: 2026-10-13 - Earliest claimed: 2021-11-30 - Assignees: Siemens Healthineers AG - Applicants: Siemens Healthineers AG - Inventors: JianMin Wang; Markus Vester - Web page: https://patentgrep.com/patent/US12761297B2 ## CPC - G01R 33/28: Details of apparatus provided for in groups G01R33/44 - G01R33/64 - G01R 33/36: Electrical details, e.g. matching or coupling of the coil to the receiver - G01R 33/3852: {Gradient amplifiers; means for controlling the application of a gradient magnetic field to the sample, e.g. a gradient signal synthesizer} - H02M 3/015: {with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuit} - H03K 7/08: Duration or width modulation {; Duty cycle modulation} - 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) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## Abstract A power supply adjustment method may include: providing a pulse-width modulation (PWM) signal, a duty cycle of the PWM signal being preset to a fixed value; performing PWM processing on an input signal by using the PWM signal to obtain a first modulation signal; performing first filtering processing on the first modulation signal to obtain a second modulation signal; and performing linear adjustment processing on the second modulation signal to output a target signal. According to the power supply adjustment method, the power supply apparatus, the portable component, and the magnetic resonance device provided in the present disclosure, interference of noise generated by PWM on the portable component can be reduced, thereby reducing requirements for a shielding component, further reducing a weight of the portable component in the magnetic resonance device and improving portability. ## Claims ### Claim 1 A power supply adjustment method applied to a portable component of a magnetic resonance device, comprising: providing a pulse-width modulation (PWM) signal, a duty cycle of the PWM signal being preset to a fixed value; performing PWM processing on an input signal, based on the PWM signal, to determine a first modulation signal; performing first filtering processing on the first modulation signal to determine a second modulation signal; adjusting the duty cycle of the PWM signal based on a feedback loop having an integration loop, wherein the first modulation signal or the second modulation signal is used as input of the feedback loop; and performing linear adjustment processing on the second modulation signal to generate a target signal and providing the target signal to the portable component to supply power to the portable component of the magnetic resonance device. ### Claim 2 (depends on 1) The method as claim 1, further comprising: performing second filtering processing on the first modulation signal to determine a third modulation signal; comparing the third modulation signal with a first reference signal to determine a first comparison signal, wherein the first reference signal is an average reference value of the first modulation signal; performing integral processing on the first comparison signal to determine a first integral signal; and adjusting the duty cycle based on the first integral signal such that the duty cycle changes based on the input signal. ### Claim 3 (depends on 2) The method as claimed in claim 2, wherein performing second filtering processing on the first modulation signal to determine a third modulation signal comprises: inputting the first modulation signal into a second filter to determine the third modulation signal, wherein the second filter is an LC low-pass filter or an RC low-pass filter, and a bandwidth of the second filter is less than or equal to 100 KHz. ### Claim 4 (depends on 1) The method as claimed in claim 1, further comprising: comparing the second modulation signal with a second reference signal to determine a second comparison signal, wherein the second reference signal is an average value of reference values of the second modulation signal; performing integral processing on the second comparison signal to determine a second integral signal; and adjusting the duty cycle based on the second integral signal, such that the duty cycle changes based on the input signal. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein performing first filtering processing on the first modulation signal to determine a second modulation signal comprises: inputting the first modulation signal into a first filter to determine the second modulation signal, wherein the first filter is an LC low-pass filter, the first filter includes two inductors arranged in series, side by side, and spaced apart. ### Claim 6 (depends on 1) The method as claimed in claim 1, wherein a voltage value of the second modulation signal is higher than that of the target signal. ### Claim 7 (depends on 1) The method as claimed in claim 1, wherein the integration loop is configured to limit a rate of change of the duty cycle to reduce background noise generated by the PWM processing. ### Claim 8 (depends on 1) The method as claimed in claim 1, wherein a rate of adjustment of the duty cycle is less than or equal to 1/20 of a frequency of the PWM signal. ### Claim 9 (depends on 1) The method as claimed in claim 1, wherein the feedback loop is configured to adjust the duty cycle such that background noise generated by the PWM processing is below a thermal noise level of the portable component. ### Claim 10 (depends on 1) The method as claimed in claim 1, wherein the integration loop comprises inversion processing to implement negative feedback adjustment of the duty cycle. ### Claim 11 A power supply apparatus for a portable component of a magnetic resonance device, comprising: a PWM signal generator configured to provide a PWM signal, a duty cycle of the PWM signal being preset to a fixed value; an input signal processor configured to perform PWM processing on an input signal to determine a first modulation signal based on the PWM signal; a first filter, an input terminal of the first filter being connected to the input signal processor, and the first filter being configured to perform first filtering processing on the first modulation signal to obtain a second modulation signal; a feedback loop having an integration loop and configured to adjust the duty cycle of the PWM signal, wherein the first modulation signal or the second modulation signal is used as input of the feedback loop; and a linear regulator, an input terminal of the linear regulator being connected to an output terminal of the first filter, and the linear regulator being configured to perform linear adjustment processing on the second modulation signal to determine a target signal and provide the target signal as an output of the linear regulator, the target signal to the portable component to supply power to the portable component of the magnetic resonance device. ### Claim 12 (depends on 11) The power supply apparatus as claim 11, further comprising: a second filter, an input terminal of the second filter being connected to the input terminal of the first filter, and the second filter being configured to perform second filtering processing on the first modulation signal to determine a third modulation signal; a first comparator, an input terminal of the first comparator being connected to an output terminal of the second filter, and the first comparator being configured to compare the third modulation signal with a first reference signal to determine a first comparison signal, wherein the first reference signal is an average reference value of the first modulation signal; and a first integrator, an input terminal of the first integrator being connected to an output terminal of the first comparator, and the first integrator being configured to perform integral processing on the first comparison signal to determine a first integral signal, wherein the PWM signal generator is further configured to adjust the duty cycle based on the first integral signal, such that the duty cycle changes based on the input signal. ### Claim 13 (depends on 12) The power supply apparatus as claimed in claim 12, wherein the second filter is an LC low-pass filter or an RC low-pass filter, and a bandwidth of the second filter is less than or equal to 100 kHz. ### Claim 14 (depends on 11) The power supply apparatus as claim 11, further comprising: a second comparator, an input terminal of the second comparator being connected to the output terminal of the first filter, and the second comparator being configured to compare the second modulation signal with a second reference signal to determine a second comparison signal, wherein the second reference signal is an average value of reference values of the second modulation signal; and a second integrator, an input terminal of the second integrator being connected to the output terminal of the second comparator, and the second integrator being configured to perform integral processing on the second comparison signal to determine a second integral signal, wherein the PWM signal generator is further configured to adjust the duty cycle based on the second integral signal, such that the duty cycle changes based on the input signal. ### Claim 15 (depends on 11) The power supply apparatus as claimed in claim 11, wherein the first filter is an LC low-pass filter, the first filter includes two inductors, and the two inductors are arranged in series, side by side, and spaced apart. ### Claim 16 A portable component used in a magnetic resonance device, comprising: a component body configured to receive a detection signal; and the power supply apparatus connected to the component body to supply power to the component body, the power supply apparatus being configured to: provide a pulse-width modulation (PWM) signal, a duty cycle of the PWM signal being preset to a fixed value; perform PWM processing on an input signal, based on the PWM signal, to determine a first modulation signal; filter the first modulation signal to determine a second modulation signal; adjust the duty cycle of the PWM signal based on a feedback loop having an integration loop, wherein the first modulation signal or the second modulation signal is used as input of the feedback loop; and perform linear adjustment processing on the second modulation signal to generate a target signal, wherein the power supply apparatus is configured to provide the target signal to the component body to supply power tot the component body of the portable component used in the magnetic resonance device. ### Claim 17 (depends on 16) A magnetic resonance device, comprising: a device body; and the portable component as claimed in claim 16, the portable component being communicatively connected to the device body.