# US 11,908,621 B2 · Inductive-load control circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,621 B2 - Document ID: US11908621B2 - Status: Granted - Kind: B2 - Application number: 17/175,759 - Filed: 2021-02-15 - Published: 2021-09-23 - Granted: 2024-02-20 - Earliest claimed: 2020-03-17 - Assignees: Alps Alpine Co., Ltd. - Applicants: Alps Alpine Co., Ltd. - Inventors: Kazuhiko Kinemura - Web page: https://patentgrep.com/patent/US11908621B2 ## CPC - H01F 7/1844: {Monitoring or fail-safe circuits (for relays H01H47/002)} - G01K 7/24: in a specially-adapted circuit, e.g. bridge circuit - H01C 7/008: {Thermistors (H01C7/02 - H01C7/06 take precedence)} - H01F 7/064: {Circuit arrangements for actuating electromagnets (circuit arrangements for obtaining special operating characteristics H01F7/18; driving circuits for electromagnets making use of a switching regulator H01H47/325)} - F16D 63/002: {Brakes with direct electrical or electro-magnetic actuation} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00) - H01C: RESISTORS - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract An inductive-load control circuit includes a circuit board on or in which a controller and a driving circuit are disposed, an inductive load disposed at a location apart from the circuit board and connected to the driving circuit of the circuit board, a detection resistor group included in the driving circuit and connected in series with the inductive load, and a temperature measuring element. The detection resistor group includes resistors. The temperature measuring element is disposed between the resistors. The controller and the driving circuit are supplied with electric power by a power supply. The driving circuit controls the electric power supplied by the power supply and applies the electric power to the inductive load. The circuit board has a signal ground connected to the controller and a power ground connected to the detection resistor group of the driving circuit. The temperature measuring element is connected to the power ground. ## Claims ### Claim 1 An inductive-load control circuit comprising: a circuit board on or in which a controller and a driving circuit are disposed; an inductive load disposed at a location apart from the circuit board and connected to the driving circuit of the circuit board; a detection resistor group included in the driving circuit and connected in series with the inductive load; and a temperature measuring element, wherein the detection resistor group includes a plurality of resistors, and the temperature measuring element is disposed between the plurality of resistors, the controller and the driving circuit are supplied with electric power by a power supply, the driving circuit controls the electric power supplied by the power supply and applies the electric power to the inductive load, the circuit board has a signal ground connected to the controller and a power ground connected to the detection resistor group of the driving circuit, and the temperature measuring element is connected to the power ground. ### Claim 2 (depends on 1) The inductive-load control circuit according to claim 1, wherein the detection resistor group includes a plurality of resistor groups connected in parallel with each other, and the temperature measuring element is disposed between the plurality of resistor groups. ### Claim 3 (depends on 2) The inductive-load control circuit according to claim 2, wherein each of the plurality of resistor groups includes a plurality of resistors connected in series with each other. ### Claim 4 (depends on 2) The inductive-load control circuit according to claim 2, wherein the plurality of resistor groups include three or more resistor groups connected in parallel with each other, and a space between the temperature measuring element and a resistor of a resistor group closest to the temperature measuring element among the three or more resistor groups is smaller than a space between resistors of resistor groups adjacent to each other among the three or more resistor groups. ### Claim 5 (depends on 1) The inductive-load control circuit according to claim 1, wherein the detection resistor group has a resistance value that is greater than or equal to 0.01Ω and is less than or equal to 1 Ω. ### Claim 6 (depends on 1) The inductive-load control circuit according to claim 1, wherein the temperature measuring element is a thermistor. ### Claim 7 (depends on 1) The inductive-load control circuit according to claim 1, wherein the circuit board has a wiring pattern connected to the power ground, and the temperature measuring element is disposed on the wiring pattern. ### Claim 8 An inductive-load control circuit comprising: a circuit board on or in which a controller and a driving circuit are disposed; an inductive load disposed at a location apart from the circuit board and connected to the driving circuit of the circuit board; a detection resistor group included in the driving circuit and connected in series with the inductive load; and a temperature measuring element, wherein the detection resistor group includes a plurality of resistors, and the temperature measuring element is disposed between the plurality of resistors, the controller and the driving circuit are supplied with electric power by a power supply, the driving circuit controls the electric power supplied by the power supply and applies the electric power to the inductive load, the circuit board has a signal ground connected to the controller and a power ground connected to the detection resistor group of the driving circuit, the temperature measuring element is connected to the power ground, the temperature measuring element is connected to a regulated voltage via another resistor, and a value of the regulated voltage is different from a value of the electric power supplied by the power supply, and a node connecting between the temperature measuring element and the another resistor is connected to the controller. ### Claim 9 (depends on 8) The inductive-load control circuit according to claim 8, wherein the detection resistor group includes a plurality of resistor groups connected in parallel with each other, and the temperature measuring element is disposed between the plurality of resistor groups. ### Claim 10 (depends on 9) The inductive-load control circuit according to claim 9, wherein each of the plurality of resistor groups includes a plurality of resistors connected in series with each other. ### Claim 11 (depends on 9) The inductive-load control circuit according to claim 9, wherein the plurality of resistor groups include three or more resistor groups connected in parallel with each other, and a space between the temperature measuring element and a resistor of a resistor group closest to the temperature measuring element among the three or more resistor groups is smaller than a space between resistors of resistor groups adjacent to each other among the three or more resistor groups. ### Claim 12 (depends on 8) The inductive-load control circuit according to claim 8, wherein the detection resistor group has a resistance value that is greater than or equal to 0.01Ω and is less than or equal to 1Ω. ### Claim 13 (depends on 8) The inductive-load control circuit according to claim 8, wherein the temperature measuring element is a thermistor. ### Claim 14 (depends on 8) The inductive-load control circuit according to claim 8, wherein the circuit board has a wiring pattern connected to the power ground, and the temperature measuring element is disposed on the wiring pattern.