# US 9,438,107 B2 · Control device, control method, and power supply device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,107 B2 - Document ID: US9438107B2 - Status: Granted - Kind: B2 - Application number: 14/095,203 - Filed: 2013-12-03 - Published: 2014-08-21 - Granted: 2016-09-06 - Earliest claimed: 2013-02-20 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: Tomotake Sasaki; Tsugito Maruyama; Yu Yonezawa; Yoshiyasu Nakashima - Web page: https://patentgrep.com/patent/US9438107B2 ## CPC - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H02M 1/0019: {the disturbance parameters being load current fluctuations} - H02M 1/0025: {Arrangements for modifying reference values, feedback values or error values in the control loop of a converter} - H02M 1/0032: {Control circuits allowing low power mode operation, e.g. in standby mode} - 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} - Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes - 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) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A control device includes: a power supply circuit that controls output voltage using a switching element; a generation unit that generates a reference signal on the basis of the output voltage from the power supply circuit; a PWM unit that generates a PWM signal that is output to the switching element by comparing the reference signal with a carrier signal; and a switching unit that switches a frequency of the carrier signal by changing amplitude of the carrier signal, wherein the generation unit generates the reference signal on the basis of the frequency. ## Claims ### Claim 1 A control device comprising: a power supply circuit that controls an output voltage using a switching element; a generation unit that generates a reference signal; a pulse width modulation unit that generates a pulse width modulation signal that is output to the switching element by comparing the reference signal with a carrier signal; and a switching unit that switches a frequency of the carrier signal by changing amplitude of the carrier signal, wherein the generation unit generates the reference signal based on the output voltage of the power supply circuit, a frequency of the carrier signal before the switching, and the frequency of the carrier signal after the switching. ### Claim 2 (depends on 1) The control device according to claim 1, wherein the generation unit generates the reference signal such that a duty ratio of the pulse width modulation signal is not changed when the frequency of the carrier signal is switched. ### Claim 3 (depends on 1) The control device according to claim 1, wherein the carrier signal is synchronized with a signal that is used to perform sampling on the output voltage. ### Claim 4 (depends on 2) The control device according to claim 2, wherein the carrier signal is synchronized with a signal that is used to perform sampling on the output voltage. ### Claim 5 (depends on 1) The control device according to claim 1, wherein the switching unit switches the frequency of the carrier signal on a basis of load current. ### Claim 6 (depends on 2) The control device according to claim 2, wherein the switching unit switches the frequency on the basis of load current. ### Claim 7 (depends on 3) The control device according to claim 3, wherein the switching unit switches the frequency on the basis of load current. ### Claim 8 (depends on 1) The control device according to claim 1, wherein the carrier signal has a saw-tooth wave. ### Claim 9 (depends on 2) The control device according to claim 2, wherein the carrier signal has a saw-tooth wave. ### Claim 10 (depends on 3) The control device according to claim 3, wherein the carrier signal has a saw-tooth wave. ### Claim 11 (depends on 4) The control device according to claim 4, wherein the carrier signal has a saw-tooth wave. ### Claim 12 (depends on 1) The control device according to claim 1, wherein the power supply circuit is a non-isolated power supply circuit. ### Claim 13 (depends on 2) The control device according to claim 2, wherein the power supply circuit is a non-isolated power supply circuit. ### Claim 14 (depends on 3) The control device according to claim 3, wherein the power supply circuit is a non-isolated power supply circuit. ### Claim 15 (depends on 4) The control device according to claim 4, wherein the power supply circuit is a non-isolated power supply circuit. ### Claim 16 (depends on 5) The control device according to claim 5, wherein the power supply circuit is a non-isolated power supply circuit. ### Claim 17 (depends on 1) The control device according to claim 1, wherein the power supply circuit is a step-down power supply circuit. ### Claim 18 (depends on 2) The control device according to claim 2, wherein the power supply circuit is a step-down power supply circuit. ### Claim 19 A power supply device comprising: a power supply circuit that controls an output voltage using a switching element; a generation unit that generates a reference signal; a pulse width modulation unit that generates a pulse width modulation signal that is output to the switching element by comparing the reference signal with a carrier signal; and a switching unit that switches a frequency of the carrier signal by changing amplitude of the carrier signal, wherein the generation unit includes a control circuit that generates the reference signal based on the output voltage of the power supply circuit, a frequency of the carrier signal before the switching, and the frequency of the carrier signal after the switching. ### Claim 20 A control method comprising: controlling an output voltage of a power supply circuit using a switching element; generating a reference signal; generating a pulse width modulation signal that is output to the switching element by comparing the reference signal with a carrier signal; and switching a frequency of the carrier signal by changing amplitude of the carrier signal, wherein in the generating of the reference signal, the reference signal is generated based on the output voltage of the power supply circuit, a frequency of the carrier signal before the switching, and the frequency of the carrier signal after the switching.