Shunt-free motor control for dc motor
By using the measurement parameters and iterative process of the power switch in the bridge circuit to determine the junction temperature of the power switch, the problem of the need for shunt resistors to monitor the current in the prior art is solved, and the current measurement of the shuntless device is realized, simplifying the circuit layout and reducing costs.
CN120195451APending Publication Date: 2025-06-24INFINEON TECHNOLOGIES AG
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Patent Information
- Application Number
- CN202411879723.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-21
- Filing Date
- 2024-12-19
- Publication Date
- 2025-06-24
AI Technical Summary
Technical Problem
The prior art requires the use of expensive shunt resistors when monitoring the current through the motor, and its layout poses challenges or limitations to other circuit components.
Method used
By utilizing the relationship between different power switches in the bridge circuit, combined with the relationship between the junction temperature, resistance and current of the power switch, an iterative process is used to determine the junction temperature of the power switch, so that the current passing through the motor can be measured without a shunt resistor.
Benefits of technology
Eliminating the need for shunt resistors, instead of using the power switch itself instead of shunt devices, simplifying the current measurement process and reducing costs.
✦ Generated by Eureka AI based on patent content.
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Figure CN120195451A_ABST
Abstract
In some examples, the disclosure describes a method that includes controlling a power switch to deliver current to an electric motor, where the power switch is disposed in a bridge (e.g., H-bridge or h-bridge) that includes a first high-side power switch, a first low-side power switch, and a second low-side power switch. Controlling the power switch to deliver current to the motor may include controlling the first high-side power switch on and controlling the second low-side power switch on, wherein current to the motor flows through the high-side power switch and the second low-side power switch. The method may include determining a current to the motor based on a voltage drop across one of the power switches disposed in the bridge.
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