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Patent Searching and Data


Title:
VOLTAGE DETECTION AND DETERMINATION CIRCUIT AND POWER BATTERY SYSTEM HAVING SAME
Document Type and Number:
WIPO Patent Application WO/2017/211193
Kind Code:
A1
Abstract:
A voltage detection and determination circuit and a power battery system having same. The circuit comprises: a detection processing module (10) connected to a voltage sampling end (VIN) and used for outputting a first detection voltage according to a voltage sampled by the voltage sampling end (VIN); a detection similarity processing module (20) for imitating the detection processing module (10) so as to generate a reference voltage corresponding to the first detection voltage; a current source module (30) for providing a bias current for the detection processing module (10) and the detection similarity processing module (20); and a comparison processing module (40) for performing comparison processing on the first detection voltage and the reference voltage so as to output a voltage detection signal. By using a detection similarity processing module (20) to imitate a detection processing module (10) so as to generate a reference voltage, the circuit does not need a reference voltage, has a simple circuit structure, also does not need to take the influence brought by an offset voltage of a comparator into account, and can accurately detect and determine a voltage sampled by a sampling end (VIN), thereby correctly identifying a charging or discharging state of a battery pack.

Inventors:
BAI QINGGANG (CN)
WANG XIAOPING (CN)
Application Number:
PCT/CN2017/086005
Publication Date:
December 14, 2017
Filing Date:
May 25, 2017
Export Citation:
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Assignee:
BYD CO LTD (CN)
International Classes:
G01R31/36; G01R19/165
Foreign References:
CN101144836A2008-03-19
CN101133507A2008-02-27
US9362874B22016-06-07
CN101140302A2008-03-12
CN105467193A2016-04-06
JP2006112906A2006-04-27
Other References:
See also references of EP 3470860A4
Attorney, Agent or Firm:
TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)
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