# US 12,214,676 B2 · Current mode control type switching 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 12,214,676 B2 - Document ID: US12214676B2 - Status: Granted - Kind: B2 - Application number: 17/374,276 - Filed: 2021-07-13 - Published: 2021-11-04 - Granted: 2025-02-04 - Earliest claimed: 2014-09-24 - Assignees: Rohm Co., Ltd. - Applicants: Rohm Co., Ltd. - Inventors: Yuhei Yamaguchi - Web page: https://patentgrep.com/patent/US12214676B2 ## CPC - B60L 50/50: using propulsion power supplied by batteries or fuel cells - G05F 3/262: {using field-effect transistors only} - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H02H 7/12: for static converters or rectifiers {(for discharge lamp power supplies using static converters H05B41/2851, H05B41/2921, H05B41/2981)} - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES - 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) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A switching power supply device includes a first switch, a second switch, a current sensing portion configured to sense current flowing in the second switch, and a controller configured to control the first and second switches in accordance with the current sensed by the current sensing portion. The controller includes an accumulating portion configured to accumulate information of the current sensed by the current sensing portion during a predetermined period of time while the first switch is in the off state, and reflecting portion configured to start the transmission of the current information accumulated by the accumulating portion before the first switch is changed from the off state to the on state so as to reflect the current information accumulated by the accumulating portion on the slope voltage, and controls the first and second switches in accordance with the slope voltage. ## Claims ### Claim 1 A switching power supply device comprising: a first switch having a first terminal connected to an application terminal to which an input voltage is applied; a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied; a controller configured to control the first switch and the second switch; a current sense portion configured to sense a signal based on an on-resistance of the second switch; a charging switch configured to be connected to the current sense portion and configured to, when the second switch is on, control charging of a capacitor according to the signal based on the on-resistance of the second switch; and an accumulating portion including the capacitor configured to connect to the charging switch and configured to accumulate information according to the signal based on the on-resistance of the second switch, wherein the controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of the switching power supply device and a reference voltage, and the controller controls off timing of the first switch based on a first voltage and an output voltage of the error amplifier, the first voltage being a voltage reflecting the information accumulated by the accumulating portion. ### Claim 2 (depends on 1) The switching power supply device according to claim 1, wherein the controller includes: a comparator configured to compare the first voltage with the output voltage of the error amplifier so as to generate a reset signal as a comparison signal; an oscillator configured to generate a set signal as a clock signal of a predetermined frequency; and a timing control circuit configured to control on and off of the first switch and on and off of the second switch in accordance with the set signal and the reset signal. ### Claim 3 (depends on 1) The switching power supply device according to claim 1, wherein the controller controls the first switch and the second switch in accordance with the current sensed by the current sensing portion. ### Claim 4 (depends on 1) The switching power supply device according to claim 1, wherein the second switch is a MOS transistor, and the current sensing portion senses the current flowing in the second switch by using a voltage between both ends of an on resistor of the MOS transistor. ### Claim 5 An integrated circuit comprising: a controller configured to control: a first switch having a first terminal connected to an application terminal to which an input voltage is applied, and a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied; a current sense portion configured to sense a signal based on an on-resistance of the second switch; a charging switch configured to be connected to the current sense portion and configured to, when the second switch is on, control charging of a capacitor according to the signal based on the on-resistance of the second switch; and an accumulating portion including the capacitor configured to connect to the charging switch and configured to accumulate information according to the signal based on the on-resistance of the second switch, wherein the controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of a switching power supply device and a reference voltage, and the controller controls off timing of the first switch based on a first voltage and an output voltage of the error amplifier, the first voltage being a voltage reflecting the information accumulated by the accumulating portion. ### Claim 6 (depends on 1) In-vehicle equipment comprising the switching power supply device according to claim 1. ### Claim 7 (depends on 2) In-vehicle equipment comprising the switching power supply device according to claim 2. ### Claim 8 (depends on 3) In-vehicle equipment comprising the switching power supply device according to claim 3. ### Claim 9 (depends on 4) In-vehicle equipment comprising the switching power supply device according to claim 4. ### Claim 10 (depends on 5) In-vehicle equipment comprising the integrated circuit according to claim 5. ### Claim 11 (depends on 6) A vehicle comprising: the in-vehicle equipment according to claim 6; and a battery configured to supply electric power to the in-vehicle equipment. ### Claim 12 (depends on 7) A vehicle comprising: the in-vehicle equipment according to claim 7; and a battery configured to supply electric power to the in-vehicle equipment. ### Claim 13 (depends on 8) A vehicle comprising: the in-vehicle equipment according to claim 8; and a battery configured to supply electric power to the in-vehicle equipment. ### Claim 14 (depends on 9) A vehicle comprising: the in-vehicle equipment according to claim 9; and a battery configured to supply electric power to the in-vehicle equipment. ### Claim 15 (depends on 10) A vehicle comprising: the in-vehicle equipment according to claim 10; and a battery configured to supply electric power to the in-vehicle equipment. ### Claim 16 A switching power supply device comprising: a first switch having a first terminal connected to an application terminal to which an input voltage is applied; a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied; a controller configured to control the first switch and the second switch; a current sense portion configured to sense a signal based on an on-resistance of the second switch; a charging switch configured to be connected to the current sense portion and configured to, when the second switch is on, control charging of a capacitor according to the signal based on the on-resistance of the second switch; and an accumulating portion configured to connect to the charging switch and configured to accumulate information according to the signal based on the on-resistance of the second switch, wherein the controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of the switching power supply device and a reference voltage, and the controller controls off timing of the first switch based on a first voltage and an output voltage of the error amplifier, the first voltage being based on the current flowing in the second switch when the first switch is off and the second switch is on. ### Claim 17 (depends on 16) The switching power supply device according to claim 16, wherein the controller includes: a comparator configured to compare the first voltage with the output voltage of the error amplifier so as to generate a reset signal as a comparison signal; an oscillator configured to generate a set signal as a clock signal of a predetermined frequency; and a timing control circuit configured to control on and off of the first switch and on and off of the second switch in accordance with the set signal and the reset signal. ### Claim 18 (depends on 17) The switching power supply device according to claim 17, wherein the controller controls the first switch and the second switch in accordance with the current sensed by the current sensing portion. ### Claim 19 (depends on 18) The switching power supply device according to claim 18, wherein the second switch is a MOS transistor, and the current sensing portion senses the current flowing in the second switch by using a voltage between both ends of an on resistor of the MOS transistor.