Title:
MOTOR PROTECTION CIRCUIT AND METHOD FOR CONTROLLING MOTOR PROTECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2017/114134
Kind Code:
A1
Abstract:
A motor protection circuit and a method for controlling the circuit. The motor protection circuit comprises: voltage-dividing resistors (R4, R5) and a sampling resistor (R1); a control chip, one end of each voltage-dividing resistor (R4, R5) accessing the control chip, two ends of the sampling resistor (R1) accessing the control chip, the control chip being used for stablising a power source voltage as a preset voltage value when detecting that voltage values of the two ends of the voltage-dividing resistors (R4, R5) are greater than a preset voltage value, and/or issuing a shutdown signal when detecting that a current value flowing through the sampling resistor (R1) is greater than a preset current value; a field-effect transistor (Q1), a gate accessing the control chip, a source accessing one end of the sampling resistor (R1), the field-effect transistor (Q1) being used for performing a shutdown according to the shutdown signal produced by the control chip. The protection circuit and the control method solve the technical problem in the prior art that power source protection circuits rely on cumbersome inductors, capacitors, fuses or transient voltage suppressors to prevent sudden changes in power source voltages and currents from damaging devices and control circuits.
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Inventors:
LIU RUOPENG (CN)
QIU SHENGLIN (CN)
QIU SHENGLIN (CN)
Application Number:
PCT/CN2016/109138
Publication Date:
July 06, 2017
Filing Date:
December 09, 2016
Export Citation:
Assignee:
SHEN ZHEN KUANG-CHI HEZHONG TECH LTD (CN)
International Classes:
H02H7/09
Foreign References:
| CN205385285U | 2016-07-13 | |||
| CN104638897A | 2015-05-20 | |||
| CN104113209A | 2014-10-22 | |||
| KR101243346B1 | 2013-03-13 | |||
| CN203787956U | 2014-08-20 | |||
| US20140160802A1 | 2014-06-12 |
Other References:
"LT 4363-High Voltage Surge Stopper with Current Limited", BAIDU LIBRARY, 17 May 2014 (2014-05-17), pages 12 and 16 - 18, Retrieved from the Internet
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