Invention Grant
- Patent Title: Active discharge circuit for link capacitor using phase leg switches
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Application No.: US15268872Application Date: 2016-09-19
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Publication No.: US10384561B2Publication Date: 2019-08-20
- Inventor: Shuitao Yang , Yan Zhou , Fan Xu , Mohammed Khorshed Alam , Lihua Chen
- Applicant: FORD GLOBAL TECHNOLOGIES, LLC
- Applicant Address: US MI Dearborn
- Assignee: FORD GLOBAL TECHNOLOGIES, LLC
- Current Assignee: FORD GLOBAL TECHNOLOGIES, LLC
- Current Assignee Address: US MI Dearborn
- Agency: MacMillan, Sobanski & Todd, LLC
- Agent David B. Kelley
- Main IPC: B60L11/00
- IPC: B60L11/00 ; B60L11/10 ; B60L11/18 ; H02M7/46 ; B60L50/14 ; H02M7/5387 ; B60L3/00 ; H02M1/32

Abstract:
A DC link capacitor in a drive system for an electric vehicle is quickly discharged using only local action within an inverter module and without any extra components to dissipate the charge. The inverter has a phase leg comprising an upper switching device and a lower switching device coupled across the capacitor. A gate driver is coupled to the phase leg to alternately switch the switching devices to ON state according to a PWM signal during pulse-width modulation of the drive system. The gate driver is configured to discharge the link capacitor during a discharge event by simultaneously activating the upper and lower switching devices to transitional states. Thus use of transitional states ensures that the switching devices provide an impedance that dissipates the capacitor charge while protecting the devices from excessive temperature.
Public/Granted literature
- US20180079315A1 ACTIVE DISCHARGE CIRCUIT FOR LINK CAPACITOR USING PHASE LEG SWITCHES Public/Granted day:2018-03-22
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