# US 11,909,321 B2 · Power supply controller and insulated switching power supply > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,321 B2 - Document ID: US11909321B2 - Status: Granted - Kind: B2 - Application number: 17/544,368 - Filed: 2021-12-07 - Published: 2022-06-16 - Granted: 2024-02-20 - Earliest claimed: 2020-12-15 - Assignees: Rohm Co., Ltd. - Applicants: Rohm Co., Ltd. - Inventors: Yoshinori Sato; Yohei Akamatsu; Satoru Nate; Hiroaki Sawaoka - Web page: https://patentgrep.com/patent/US11909321B2 ## CPC - H02M 3/33523: {with galvanic isolation between input and output of both the power stage and the feedback loop} - H02M 1/0022: {the disturbance parameters being input voltage fluctuations} - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 1/36: Means for starting or stopping converters - H02M 1/44: Circuits or arrangements for compensating for electromagnetic interference in converters or inverters - H02M 1/0006: {Arrangements for supplying an adequate voltage to the control circuit of converters} - H02M 1/0009: {Devices or circuits for detecting current in a converter} - H02M 1/348: {Passive dissipative snubbers} - H02M 3/33515: {with digital control} - 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 There is provided a power supply controller including: a monitor voltage generation part configured to generate a monitor voltage according to a primary voltage of a transformer that forms an insulated switching power supply; a sample/hold part configured to sample/hold the monitor voltage and output a feedback voltage; and a controller configured to turn on/off a primary current of the transformer by a fixed on-time method according to the feedback voltage, wherein the sample/hold part samples/holds the primary voltage at a plurality of different timings and outputs one of a plurality of hold values as the feedback voltage. ## Claims ### Claim 1 A power supply controller comprising: a monitor voltage generation part configured to generate a monitor voltage according to a primary voltage of a transformer that forms an insulated switching power supply; a sample/hold part configured to sample/hold the monitor voltage and output a feedback voltage; a controller configured to turn on/off a primary current of the transformer by a fixed on-time method according to the feedback voltage; and a comparator configured to compare the feedback voltage with a slope-shaped reference voltage to generate a set signal, wherein the sample/hold part samples/holds the primary voltage at a plurality of different timings and outputs one of a plurality of hold values as the feedback voltage, and wherein the controller determines on-timing of the primary current according to the set signal. ### Claim 2 (depends on 1) The power supply controller of claim 1, wherein the sample/hold part outputs the highest one of the plurality of hold values as the feedback voltage. ### Claim 3 (depends on 2) The power supply controller of claim 2, wherein when on-duty of the primary current is higher than a predetermined threshold value, the sample/hold part outputs a hold value sampled/held at the latest timing as the feedback voltage, without depending on a result of comparison of the plurality of hold values. ### Claim 4 (depends on 1) The power supply controller of claim 1, wherein the sample/hold part includes: a plurality of sets of analog switches and capacitors configured to output the plurality of hold values by sampling/holding the monitor voltage at a plurality of different timings; at least one comparator configured to compare the plurality of hold values to generate a selection signal; and a feedback voltage output part configured to output the highest one of the plurality of hold values as the feedback voltage, according to the selection signal. ### Claim 5 (depends on 4) The power supply controller of claim 4, wherein when on-duty of the primary current is higher than a predetermined threshold value, the feedback voltage output part outputs a hold value sampled/held at the latest timing as the feedback voltage, without depending on the selection signal. ### Claim 6 (depends on 1) The power supply controller of claim 1, wherein the monitor voltage is a voltage signal obtained by blunting the primary voltage. ### Claim 7 (depends on 1) The power supply controller of claim 1, wherein the primary voltage is a switch voltage appearing in a primary winding of the transformer. ### Claim 8 (depends on 1) An insulated switching power supply comprising: the power supply controller of claim 1; a transformer configured to apply a DC input voltage to a primary winding; and a rectifying/smoothing circuit configured to generate a DC output voltage by rectifying/smoothing an induced voltage appearing in a secondary winding of the transformer. ### Claim 9 (depends on 8) A vehicle comprising: the insulated switching power supply of claim 8. ### Claim 10 A power supply controller comprising: a monitor voltage generation part configured to generate a monitor voltage according to a primary voltage of a transformer that forms an insulated switching power supply; a sample/hold part configured to sample/hold the monitor voltage and output a feedback voltage; and a controller configured to turn on/off a primary current of the transformer by a fixed on-time method according to the feedback voltage, wherein the sample/hold part samples/holds the primary voltage at a plurality of different timings and outputs one of a plurality of hold values as the feedback voltage, wherein the sample/hold part includes: a plurality of sets of analog switches and capacitors configured to output the plurality of hold values by sampling/holding the monitor voltage at a plurality of different timings; at least one comparator configured to compare the plurality of hold values to generate a selection signal; and a feedback voltage output part configured to output the highest one of the plurality of hold values as the feedback voltage, according to the selection signal, and wherein when on-duty of the primary current is higher than a predetermined threshold value, the feedback voltage output part outputs a hold value sampled/held at the latest timing as the feedback voltage, without depending on the selection signal.