Cell scanning circuit and method for battery protection chip
A technology for protecting chips and scanning circuits, applied in the field of electronics, can solve problems such as large voltage jumps at the positive and negative terminals, and achieve the effects of reducing the voltage jumping amplitude, increasing the scanning rate, and reducing the time.
Active Publication Date: 2018-01-30
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology
[0007] The purpose of the present invention is to provide a cell scanning method for a battery protection chip to solve the problem that the positive and negative terminal voltage of the battery protection chip has a large jump range
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[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0051] In order to facilitate the understanding of the embodiments of the present invention, further explanations will be given below with specific embodiments in conjunction with the accompanying drawings, which are not intended to limit the embodiments of the present invention.
[0052] Below to figure 2 As an example, the cell scanning m...
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The invention relates to a cell scanning circuit and method for a battery protection chip. The method includes: the gating device gates the corresponding battery cell according to a preset gating rule; the preset gating rule includes: the positive pole of the currently gated battery cell and the positive pole of the next gated battery cell The absolute value of the potential difference between them is not greater than the first threshold; the absolute value of the potential difference between the positive pole of the current gated battery cell and the positive pole of the current previously gated battery core is not greater than the first threshold value; some or all of the batteries The cells will be strobed one by one; the selected cells will be strobed again after a period of time; the detection circuit detects the voltage of the currently gated cell. The embodiment of the present invention reduces the voltage jump range of the positive and negative terminals of the detection circuit, thereby reducing the time for the detection circuit to establish a stable operating point and improving detection accuracy.
Description
technical field [0001] The invention relates to the field of electronics, in particular to a cell scanning circuit and method for a battery protection chip. Background technique [0002] In industries such as electric bicycles and electric vehicles that require the use of battery protection chips, multiple batteries are often connected in series and in parallel to provide a sufficiently high voltage and a sufficiently large current. [0003] In battery protection chips, common voltage detection methods include continuous detection and scanning detection. Among them, the continuous detection method has a detection circuit for each cell voltage to work continuously. The advantage is that each cell voltage can be detected in real time without scanning errors, but the disadvantage is that the power consumption of multiple detection circuits is high, so The area occupied is large; the scanning detection method is to multiplex a detection circuit according to a certain scanning s...
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IPC IPC(8): H02H7/18
Inventor 张勇尹航王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD