原来都是二极管耐压惹的祸

乌龙事件：两个二极管弄反了

01 二极管耐压

一、前言

刚才测试了这款简单升压电路的工作电压特性。测量电路的输出电压随着工作电源升高变化的情况。谁知得到了这样一个非常奇怪的电压曲线。当工作电压超过3.6V之后，输出电压不升反降。现在回忆是电路中二极管的反向击穿电压太小了。下面测量一下电路中整流二极管和钳位二极管的反向击穿电压。看是否因为它们的原因。

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二、测量结果

首先测量整流二极管的反向击穿电压。居然只有93V。这也就是说明为什么前面测量的输出电压被限制在 100V之内了。接下来再测量这款稳压二极管，看看它的反向击穿电压。居然有 155V。

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下面更换一个耐压更高的整流二极管 FR107，重新测试振荡电路的工作电压与输出高压之间的关系。测量工作电压从 0V 变化到 5V 过程中，记录升压电路输出电压的大小。总共测量 100 个数据点。根据测量结果来看，该电路的输出电压与工作电源之间是一个单调变化的结果。这也解释了前面测试结果中奇怪的现象了。

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▲ 图1.2.1 电路工作电源与输出电压之间的关系

▲ 图1.2.1 电路工作电源与输出电压之间的关系

vdim=[0.00,0.05,0.10,0.15,0.20,0.25,0.30,0.35,0.40,0.45,0.51,0.56,0.61,0.66,0.71,0.76,0.81,0.86,0.91,0.96,1.01,1.06,1.11,1.16,1.21,1.26,1.31,1.36,1.41,1.46,1.52,1.57,1.62,1.67,1.72,1.77,1.82,1.87,1.92,1.97,2.02,2.07,2.12,2.17,2.22,2.27,2.32,2.37,2.42,2.47,2.53,2.58,2.63,2.68,2.73,2.78,2.83,2.88,2.93,2.98,3.03,3.08,3.13,3.18,3.23,3.28,3.33,3.38,3.43,3.48,3.54,3.59,3.64,3.69,3.74,3.79,3.84,3.89,3.94,3.99,4.04,4.09,4.14,4.19,4.24,4.29,4.34,4.39,4.44,4.49,4.55,4.60,4.65,4.70,4.75,4.80,4.85,4.90,4.95,5.00]
odim=[0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,17.82,21.47,24.96,27.98,30.79,34.41,37.31,40.23,42.99,45.75,48.42,50.97,53.56,56.00,58.48,60.89,63.18,65.48,67.72,69.83,71.96,73.97,75.99,77.96,79.82,81.69,83.51,85.23,86.95,88.58,90.22,91.82,93.33,94.86,96.29,97.73,99.14,100.47,101.82,103.16,104.38,105.63,106.81,107.99,109.16,110.27,111.38,112.43,113.48,114.52,115.50,116.50,117.50,118.39,119.21,120.06,120.95,121.80,122.58,126.37,127.43,128.36,129.26,130.08,130.90,131.66,132.38,133.10,133.78,134.47,135.15,135.80,136.46,136.99,137.48,138.09,138.69,139.24,139.67,140.23,140.83,141.43,141.98,142.53,143.05,143.58,144.09,144.57]

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST1.PY                     -- by Dr. ZhuoQing 2023-12-16
#
# Note:
#============================================================

from headm import *
from tsmodule.tsvisa        import *

dm3068open(138)

vdim = linspace(0, 5, 100)
odim = []

dh1766setvolt(0, 0, 0)
time.sleep(5)

for v in vdim:
    dh1766setvolt1(0, 0, v)
    time.sleep(1)
    o = dm3068vdc()
    printff(v, o)
    odim.append(o)

    tspsave('measure', vdim=vdim,odim=odim)


dh1766setvolt1(0, 0, 0)
plt.plot(vdim, odim, lw=3)

plt.xlabel("Work Voltage(V)")
plt.ylabel("Output(V)")
plt.grid(True)
plt.tight_layout()
plt.show()





#------------------------------------------------------------
#        END OF FILE : TEST1.PY
#============================================================

※ 总结 ※

现在回想起来，应该是在前面实验中，将这两个二极管给搞混了。这个黑色封装的是一个稳压保护二极管。它的耐压为 93V。而这个小型玻璃封装的是整流二极管，它的耐压为 155V。看来前面的确是搞了一个乌龙事件。

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● 相关图表链接:

图1.2.1 电路工作电源与输出电压之间的关系