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US 11,381,194 B2Granted
Protective device for a semiconductor switch of an electric motor of an electromechanical motor vehicle steering system
AssigneesThyssenkrupp Presta AG, thyssenkrupp AG
InventorGábor Nagy
Life of this patent
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Abstract
An electromechanical motor vehicle power steering system having a multiphase, permanently excited electric motor via a controller and supply lines from an onboard power supply of a motor vehicle.
Claims14
An electromechanical motor vehicle power steering system for a motor vehicle, comprising:
- a controller,
- supply lines connected to an onboard DC power supply of a motor vehicle,
- a multiphase, permanently excited electric motor operatively connected to the controller and the supply lines,
- wherein the electric motor comprises at least three phase windings that are connected to a driver circuit via lines,
- wherein the driver circuit connects each of the lines to a positive supply line of the supply lines via a respectively first MOSFET of a first group and to a negative supply line of the supply lines via a respectively second MOSFET of a second group, in accordance with the controller, and
- wherein each of the lines has a MOSFET as a safety switch that is arranged with a body diode in a forward conducting direction with respect to the onboard DC power supply,
- wherein each safety switch has a protective device that comprises at least one suppressor diode that is connected in parallel with the respective safety switch and arranged in the forward conducting direction with respect to the onboard DC power supply, and for each phase winding a diode that is connected in series with respect to the at least one suppressor diode and in a reverse direction with respect to the onboard DC power supply.
4 more elements
An electromechanical motor vehicle power steering system for a motor vehicle, comprising:
- a controller;
- supply lines connected to an onboard DC power supply of a motor vehicle;
- a multiphase, permanently excited electric motor operatively connected to the controller and the supply lines, wherein the electric motor comprises at least three phase windings that are connected to a driver circuit via lines, wherein the driver circuit connects each of the lines to a positive supply line of the supply lines via a respectively first MOSFET of a first group and to a negative supply line of the supply lines via a respectively second MOSFET of a second group, in accordance with the controller, wherein each of the lines has a MOSFET as a safety switch that is arranged with a body diode in a forward conducting direction with respect to the onboard DC power supply;
- and
- a single suppressor diode which is arranged upstream of a common connecting point of the current conducting paths,
- wherein each safety switch has a protective device that comprises for each phase winding a diode that is connected downstream of the single suppressor diode and in a reverse direction with respect to the onboard DC power supply.
3 more elements
Dependencies are inferred from the claim text.