Electric compressor for vehicle
By implementing capacitor discharge control in the on-board electric compressor, using temperature detection and current control to limit the current of the switching element, the problem of thermal damage to the switching element caused by false detection is solved, and the safety and efficiency of capacitor discharge is achieved.
CN119731925APending Publication Date: 2025-03-28SANDEN CO LTD
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Patent Information
- Application Number
- CN202380059323.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-08-24
- Filing Date
- 2023-07-27
- Publication Date
- 2025-03-28
AI Technical Summary
Technical Problem
In an on-board electric compressor, due to the misdetection of the current sensor, the switching elements of the inverter circuit may continue to flow through the current while maintaining a high voltage state, resulting in excessive heat generation of the switching elements and possible thermal damage.
Method used
A capacitor discharge control method is designed to limit the current flowing through the switching element to be lower than the allowable current through temperature detection and current control to prevent the switching element from overheating.
Benefits of technology
It effectively prevents damage to the switching components of the inverter circuit (thermal damage, etc.), and ensures the smooth discharge of the capacitor.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides an electric compressor for a vehicle, which can prevent a switching element of an inverter circuit from being damaged through capacitor discharge control for discharging a capacitor. In an electric compressor (1) for a vehicle, a control unit (55) of an inverter device (5) for supplying power to an electric motor for driving a compression mechanism performs capacitor discharge control for discharging charges accumulated in a first capacitor (51) and a second capacitor (21) by controlling switching elements (Q1, Q4, and Q6) among a plurality of switching elements (Q1-Q6) of an inverter circuit (50). The control unit (55) is configured to control the switching elements (Q1, Q4, Q6) so that the current flowing through the switching elements (Q1, Q4, Q6) is equal to or less than an allowable current corresponding to the temperature of the switching elements.
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