Switching tube junction temperature detection method, motor controller, motor control system and medium
By calculating the DC bus current and tube voltage drop in the motor control system, the on-resistance and junction temperature of the switching transistor are obtained, solving the problem of inaccurate temperature detection of discrete switching devices and realizing precise temperature protection for the switching devices.
CN114337403BActive Publication Date: 2025-11-25GUANGDONG WELLING ELECTRIC MACHINE MFG
Patent Information
- Application Number
- CN202111655470.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-30
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2041-12-30
Smart Images
Figure CN114337403B_ABST
Abstract
The application discloses a kind of switch tube junction temperature detection method, motor controller, motor control system and medium, method includes: obtaining direct current bus current;According to the direct current bus current, determine the motor phase current when the lower tube of any one phase bridge arm in H bridge is turned on, and obtain the tube voltage drop when the lower tube of any one phase bridge arm in H bridge is turned on;According to the motor phase current when the lower tube of any one phase bridge arm in H bridge is turned on, determine the conduction current when the lower tube of at least one phase bridge arm in H bridge is turned on, and according to the conduction current when the lower tube of at least one phase bridge arm is turned on and the tube voltage drop when the lower tube of at least one phase bridge arm is turned on, determine the conduction resistance when the lower tube of at least one phase bridge arm is turned on;According to the conduction resistance when the lower tube of at least one phase bridge arm is turned on, determine the lower tube junction temperature of at least one phase bridge arm.The method obtains the conduction resistance by calculating the tube voltage drop and the conduction current, determines the lower tube junction temperature based on the conduction resistance, so that the lower tube junction temperature obtained has higher accuracy.
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Citation Information
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