	US 11,926,271 B2
	Detection circuit for instantaneous voltage drop and on-board diagnostic system
Qian Yang, Shenzhen (CN); Jian Li, Shenzhen (CN); Jianhua Zhang, Shenzhen (CN); and Jijie Shi, Shenzhen (CN)
Assigned to ZTE CORPORATION, Shenzhen (CN)
Appl. No. 17/624,432
Filed by ZTE Corporation, Shenzhen (CN)
PCT Filed Apr. 13, 2020, PCT No. PCT/CN2020/084508 § 371(c)(1), (2) Date Jan. 3, 2022, PCT Pub. No. WO2021/031584, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 201910777986.6 (CN), filed on Aug. 22, 2019.
Prior Publication US 2022/0363208 A1, Nov. 17, 2022
Int. Cl. B60R 16/023 (2006.01); G01R 19/165 (2006.01); G01R 31/00 (2006.01)

CPC B60R 16/0232 (2013.01) [G01R 19/16542 (2013.01); G01R 31/006 (2013.01)]

18 Claims

1. A detection circuit for instantaneous voltage drop, comprising: two RC circuits, a comparator and a determination unit;

each RC circuit comprises a first resistor, a second resistor and an energy storage capacitor; a first end of the first resistor is used for receiving a to-be-detected voltage, a second end of the first resistor is connected to a first end of the second resistor, and a second end of the second resistor is grounded; the energy storage capacitor is connected in parallel with the second resistor; the first end of the second resistor forms an output end of the RC circuit;

output ends of the two RC circuits are correspondingly connected to two input ends of the comparator respectively; an output end of the comparator is connected to the determination unit;

wherein in the two RC circuits, resistance ratios of the second resistors to the first resistors are different, capacitances of the energy storage capacitors are different, and the capacitance of the energy storage capacitor in the RC circuit with a larger resistance ratio of the second resistor to the first resistor is smaller; and the determination unit is configured to determine that the to-be-detected voltage drops instantaneously when it is at least detected that the comparator is inverted.