US 12,288,974 B2
Over-current protection system
Qiaozheng Wu, Hubei (CN); Fei Liu, Hubei (CN); and Xiaohui Liu, Hubei (CN)
Assigned to VALEO AUTOMOTIVE AIR CONDITIONING HUBEI CO. LTD, Hubei (CN)
Appl. No. 17/916,945
Filed by VALEO AUTOMOTIVE AIR CONDITIONING HUBEI CO., LTD., Hubei (CN)
PCT Filed Apr. 6, 2021, PCT No. PCT/CN2021/085642
§ 371(c)(1), (2) Date Oct. 4, 2022,
PCT Pub. No. WO2021/204110, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 202010268082.3 (CN), filed on Apr. 8, 2020.
Prior Publication US 2023/0155365 A1, May 18, 2023
Int. Cl. H02H 3/08 (2006.01); H02H 3/02 (2006.01); H02H 3/06 (2006.01)
CPC H02H 3/08 (2013.01) [H02H 3/021 (2013.01); H02H 3/06 (2013.01); H03K 2217/0027 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An over-current protection system, comprising:
a sensing device adapted to sense current flowing to an electrical device;
at least one comparator adapted to compare a signal received from the sensing device and a reference signal to generate any one of high signal and low signal, wherein the output of the at least one comparator is connected to a control device to connect and disconnect the electrical device from a power source;
at least one first transistor connected to the output signal of the at least one comparator to control the at least one first transistor, wherein the at least one first transistor is in a conductive state when the output signal of the at least one comparator is a high signal;
at least one second transistor connected to and controlled by the at least one first transistor, wherein the at least one second transistor is in a conductive state when the at least one first transistor is in the conductive state, wherein the over-current protection system is configured so that the output of the at least one comparator is grounded through the at least one second transistor when the at least one second transistor is in the conductive state; and
a third transistor connected to the at least one first transistor and adapted to control the at least one first transistor, when the output signal of the at least one comparator is a low signal,
wherein a base terminal of the at least one first transistor is connected to both of the output of the at least one comparator through a second resistor and a collector terminal of the third transistor to control the at least one first transistor.