Invention Grant
- Patent Title: Over-current protection method and circuit for a DC inverter
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Application No.: US14706284Application Date: 2015-05-07
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Publication No.: US09698591B2Publication Date: 2017-07-04
- Inventor: Chenyi Jiang
- Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY , JOHNSON CONTROLS AIR CONDITIONING AND REFRIGERATION (WUXI) CO., LTD. , YORK GUANGZHOU AIR CONDITIONING AND REFRIGERATION CO., LTD.
- Applicant Address: US MI Holland CN Wuxi, Jiangsu CN Guangdong
- Assignee: JOHNSON CONTROLS TECHNOLOGY COMPANY,JOHNSON CONTROLS AIR CONDITIONING AND REFRIGERATION (WUXI) CO., LTD.,YORK GUANGZHOU AIR CONDITIONING AND REFRIGERATION CO., LTD.
- Current Assignee: JOHNSON CONTROLS TECHNOLOGY COMPANY,JOHNSON CONTROLS AIR CONDITIONING AND REFRIGERATION (WUXI) CO., LTD.,YORK GUANGZHOU AIR CONDITIONING AND REFRIGERATION CO., LTD.
- Current Assignee Address: US MI Holland CN Wuxi, Jiangsu CN Guangdong
- Priority: CN201410491960 20140923
- Main IPC: H02H3/08
- IPC: H02H3/08 ; H02H7/122 ; H02H3/00 ; H02H7/08

Abstract:
An over-current protection method and circuit for a DC Inverter is provided in the present invention. Said over-current protection circuit comprises: a sampling unit for sampling output currents from a power module to form a sampling signal; a signal-processing unit for amplifying with various magnification factors and low-pass filtering the sampling signal to generate a first over-current signal and a second over-current signal; a signal-generating unit for generating a first interrupt trigger signal based on the first over-current signal; a comparison unit for comparing the second over-current signal with a reference voltage corresponding to an over-current threshold of a motor, with a comparison result being a second interrupt trigger signal; and a control unit for controlling the power module based on the first interrupt trigger signal, and the motor based on the second interrupt trigger signal. The over-current protection method and circuit provided in the present invention are able to satisfy over-current protection of the power module and the motor of the inverter simultaneously.
Public/Granted literature
- US20160087419A1 OVER-CURRENT PROTECTION METHOD AND CIRCUIT FOR A DC INVERTER Public/Granted day:2016-03-24
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