板卡目前的问题： 上电/掉电时，电磁阀不受控制的导通一下，其链路上的导通指示灯会亮一下，当电磁阀链路有气压时，上电/掉电时，会出现“砰”的响声。（这个响声影响用户体验，是不应该有的）下述为涉及到的各部分电路：
Board card current problem: when the power on/off, the solenoid valve does not control the conduction, the guide on the link light will light up, when the solenoid valve link air pressure, when the power on/off, there will be a "bang" sound.(This noise should not affect the user experience.) The following are the circuits involved:
图1MOS 控制电路
AO4826的替代型号有：1. TI MOS CSD88537ND 和2. IRF7351和AO4826都有在用。
The replacement models of AO4826 are: 1. TI MOS CSD88537ND and 2. IRF7351 and AO4826 are in use.
图2 VCC-VA为电磁翻的电源描述如上图所示。
4 .
调试方法汇总如下：
- 曾怀疑VCC-VA电磁阀供电电压处的电解电容值大了，加NTC后测试没效果，逐步取掉所有电解电容也没效果。
- 把FPGA引脚上拉电阻由10K替换为1K测试没有效果，
Debugging methods are summarized as follows:
1. I suspected that the electrolytic capacitor at the power supply voltage of VCC-VA solenoid valve was large, and the test after adding NTC was not effective, so was the gradual removal of all the electrolytic capacitors.
2. The test of replacing the pull resistor of FPGA pin with 1K instead of 10K has no effect.
