MOS tube protection device of lithium battery power supply module
A technology of MOS tube and power supply module, applied in battery circuit devices, circuit devices, measuring devices, etc., can solve the problems of MOS damage, open circuit or open circuit, MOS tube damage, etc., and achieve the effect of preventing the deterioration of the problem.
Pending Publication Date: 2021-09-28
SUZHOU CHUNJU ELECTRIC CO LTD
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Problems solved by technology
[0002] The power MOS tube is the key component on the lithium battery protection board, and the input impedance of the MOS tube itself is very high, and the capacitance between the gate and the source is very small. The gate is particularly easy to damage the MOS tube due to EOS. Electrostatic protection measures will be added to the end, but it still cannot completely avoid MOS damage
[0003] If the MOS tube is completely damaged, it will appear as an open circuit or an open circuit, and the whole machine will not work normally, which is easy to be found
If EOS fails to completely damage the MOS tube, the resulting damage is usually called soft breakdown, and the whole machine can still work normally, but working for a long time may cause the MOS tube to overheat, resulting in danger
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[0019] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0020] see figure 1 , the figure shows a MOS tube protection device for a lithium battery power supply module provided by an embodiment of the present invention, which mainly includes a MOS tube 1 and a grid voltage detection circuit, the MOS tube 1 is electrically connected to the grid voltage detection circuit, and the grid The pole voltage detection circuit has a first line 11, a second line 12, a third line 13, a fourth line 14...
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The invention provides an MOS tube protection device of a lithium battery power supply module, wherein the MOS tube protection device is provided with a first circuit, a second circuit, a third circuit, a fourth circuit, a fifth circuit and a sixth circuit; one end of an MOS tube is connected with the lithium battery power supply module and a motor driver, the other end of the MOS tube is connected with the first circuit, and the first circuit is provided with a first resistor; the first circuit is connected with the second circuit and the third circuit; the second circuit is provided with a second resistor, the third circuit is provided with a third resistor and a first triode, the fourth circuit is connected with the third circuit, the fourth circuit is provided with a fourth resistor and a second triode, and the fifth circuit is connected with the fourth circuit and a motor; and the fifth circuit is provided with a fifth resistor, the sixth circuit is connected with the fifth circuit, and the sixth circuit is provided with a sixth resistor. According to the invention, the gate driving voltage of the power MOS tube can be monitored in real time, so that whether a gate of the MOS tube is softly broken down or not is judged, and dangers caused by problem deterioration are effectively prevented.
Description
technical field [0001] The invention relates to a lithium battery power supply protection circuit, in particular to a MOS tube protection device for a lithium battery power supply module. Background technique [0002] The power MOS tube is the key component on the lithium battery protection board, and the input impedance of the MOS tube itself is very high, and the capacitance between the gate and the source is very small. The gate is particularly easy to damage the MOS tube due to EOS. Electrostatic protection measures will be added to the terminal, but it still cannot completely avoid MOS damage. [0003] If the MOS tube is completely damaged, it will appear as an open circuit or an open circuit, and the whole machine cannot work normally, which is easy to be found. If EOS fails to completely damage the MOS tube, the resulting damage is usually called soft breakdown, and the whole machine can still work normally, but if it works for a long time, it may cause the MOS tube ...
Claims
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Login to View More IPC IPC(8): H02J7/00G01R31/26
CPCH02J7/0029H02J7/0063G01R31/2623
Inventor 刘广亚刘捷王超干
Owner SUZHOU CHUNJU ELECTRIC CO LTD