Circuit for controlling common ground of battery and RS485 communication module
A technology of RS485 and communication module, applied in the field of control battery and RS485 communication module common ground, can solve the problems of fragile components, high material cost, potential difference, etc., to reduce product space, material cost and simple circuit. Effect
Pending Publication Date: 2022-03-25
SHENZHEN RUIBIDA TECH
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Problems solved by technology
In this way, the cost of materials will be much higher, and the circuit will be more complicated.
If the two share the same ground, the ground of the communication chip will be suspended when the battery is turned off, and there will be a potential difference between the ground and the ground, which is easy to damage the device
Method used
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Embodiment 1
[0017] like Figure 1-3 As shown, a circuit for controlling the common ground of the battery and the RS485 communication module is applied in the battery pack power supply system with the RS485 communication module. The circuit for controlling the common ground of the battery and the RS485 communication module includes: MOS tube Q11, MOS tube Q10, a first control circuit, a second control circuit and a battery management unit U1;
[0018] The MOS transistor Q11 and the MOS transistor Q10 are sequentially connected and arranged between the power input and output terminal CH+ and the positive pole B+ of the battery pack, the S pole of the MOS transistor Q11 is connected to the power input and output terminal CH+, and the D of the MOS transistor Q11 The pole is connected to the D pole of the MOS transistor Q10, the S pole of the MOS transistor Q10 is connected to the positive pole B+ of the battery pack, and the negative pole B- of the battery pack is connected to the common grou...
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A circuit for controlling common ground of a battery and an RS485 communication module belongs to the technical field of electronic circuits and is used for solving the problem that a potential difference is generated between the ground and the ground to damage a device when a BMS (Battery Management System) with an RS485 communication function and a battery pack power supply system are in common ground to turn off the battery. The circuit for controlling the common ground of the battery and the RS485 communication module comprises an MOS tube Q11, an MOS tube Q10, a first control circuit, a second control circuit and a battery management unit U1. The MOS tube Q11 and the MOS tube Q10 are sequentially connected between the electric energy input and output end CH + and the positive electrode B + of the battery pack. The negative electrode B-of the battery pack and the RS485 communication module are jointly connected with the common ground C-. The first control circuit is respectively connected with the battery management unit U1, the G pole of the MOS tube Q11 and the negative pole B-of the battery pack, and the second control circuit is respectively connected with the battery management unit U1, the G pole of the MOS tube Q10, the positive pole B + of the battery pack and the negative pole B-of the battery pack. The beneficial effects are that the two P-MOS tubes are used to control the on-off of the positive electrode of the battery pack, the battery and the RS485 communication module are in common ground, the material cost is low, the circuit is simple, and the product space is reduced.
Description
technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a circuit for controlling the shared ground of a battery and an RS485 communication module. Background technique [0002] The BMS with RS485 communication function and the battery pack power supply system on the market both turn off the negative pole of the battery pack, and they do not share the same ground. They need to use chip RS485, isolation chip π131U31, isolation transformer, and optical coupler to isolate the ground. In this way, the cost of materials will be much higher, and the circuit will be more complicated. If the two share the same ground, the ground of the communication chip will be suspended when the battery is turned off, and there will be a potential difference between the ground and the ground, which will easily damage the device. Contents of the invention [0003] In order to solve the above problems, the present invention provides...
Claims
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Login to View More IPC IPC(8): H02J7/00H02H7/18H02H3/16H01R4/66
CPCH02J7/00032H02J7/0029H02J7/0031H02J7/0063H02H7/18H02H3/16H01R4/66
Inventor 韩地元谢宝棠赵素芳郑阳辉郭贵元谢源
Owner SHENZHEN RUIBIDA TECH