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Title:
SHORT-CIRCUIT PROTECTION DETECTION CIRCUIT AND DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/038016
Kind Code:
A1
Abstract:
A short-circuit protection detection circuit (101), comprising a starting circuit (11) and a comparator (15), and further comprising a positive temperature coefficient current generation circuit (12) and a short-circuit protection threshold generation circuit (13). The positive temperature coefficient current generation circuit (12) respectively applies, to the two bipolar transistors having different current densities, two currents of the same magnitude generated by mirroring, so as to generate a difference between the base-emitter voltages of two bipolar transistors, the difference between the voltages is proportional to the absolute temperature, and then is converted, by means of a resistor, to a positive temperature coefficient current for short-circuit protection threshold compensation; the short-circuit protection threshold generation circuit (13) is configured to apply, to two resistors composed by different numbers of unit resistors, two positive temperature coefficient currents generated by mirroring, and design the ratio of the two positive temperature coefficient currents and the ratio of the numbers of unit resistors of the two resistors, so as to perform matching to generate a short-circuit protection threshold voltage matching the detection voltage temperature coefficient of the drain of a switch transistor NM1.

Inventors:
ZHOU ACHENG (CN)
ZENG ZHENGQIU (CN)
Application Number:
PCT/CN2019/084988
Publication Date:
February 27, 2020
Filing Date:
April 29, 2019
Export Citation:
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Assignee:
SHENZHEN NANYUN MICROELECTRONICS CO LTD (CN)
MORNSUN GUANGZHOU SCI & TECH (CN)
International Classes:
G01R31/00; G05F3/30; H02M3/00
Foreign References:
CN209148780U2019-07-23
CN108983007A2018-12-11
CN102290995A2011-12-21
CN101178610A2008-05-14
CN106100379A2016-11-09
US7408755B12008-08-05
JPH06180806A1994-06-28
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)
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