protues中无法找到结点

Question

这是报错信息
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PROSPICE 8.13.00 (Build 32709) (C) Labcenter Electronics 1993-2022.
Loaded netlist 'C:\Users\ÄêÉÙÓÐΪ\AppData\Local\Temp\LISA5487.SDF' for design 'Boost Configuration'
[SPICE] transient GMIN stepping at time=3.42974e-006 @0.000003430s
Simulation is not running in real time due to excessive CPU load. @0.000003430s
[SPICE] transient GMIN stepping at time=3.42974e-006 @0.000003430s
[SPICE] transient GMIN stepping at time=3.43311e-006 @0.000003433s
[SPICE] transient GMIN stepping at time=3.45517e-006 @0.000003455s
[SPICE] transient GMIN stepping at time=3.47939e-006 @0.000003479s
[SPICE] transient GMIN stepping at time=3.48373e-006 @0.000003484s
[SPICE] transient GMIN stepping at time=3.48385e-006 @0.000003484s
[SPICE] transient GMIN stepping at time=3.50218e-006 @0.000003502s
[SPICE] transient GMIN stepping at time=3.50726e-006 @0.000003507s
[SPICE] transient GMIN stepping at time=3.50726e-006 @0.000003507s
[SPICE] transient GMIN stepping at time=3.51071e-006 @0.000003511s
[SPICE] transient GMIN stepping at time=3.51367e-006 @0.000003514s
[SPICE] transient GMIN stepping at time=3.51367e-006 @0.000003514s
[SPICE] transient GMIN stepping at time=3.51367e-006 @0.000003514s
[SPICE] transient GMIN stepping at time=3.52055e-006 @0.000003521s
[SPICE] transient GMIN stepping at time=3.52465e-006 @0.000003525s
[SPICE] transient GMIN stepping at time=3.52465e-006 @0.000003525s
[SPICE] transient GMIN stepping at time=3.52473e-006 @0.000003525s
[SPICE] transient GMIN stepping at time=3.52634e-006 @0.000003526s
[SPICE] transient GMIN stepping at time=3.52641e-006 @0.000003526s
[SPICE] transient GMIN stepping at time=3.52799e-006 @0.000003528s
[SPICE] transient GMIN stepping at time=3.52803e-006 @0.000003528s
[SPICE] transient GMIN stepping at time=3.52957e-006 @0.000003530s
[SPICE] transient GMIN stepping at time=3.52963e-006 @0.000003530s
[SPICE] transient GMIN stepping at time=3.52965e-006 @0.000003530s
[SPICE] transient GMIN stepping at time=3.52965e-006 @0.000003530s
[SPICE] transient GMIN stepping at time=3.53135e-006 @0.000003531s
[SPICE] transient GMIN stepping at time=3.54157e-006 @0.000003542s
[SPICE] transient GMIN stepping at time=3.54543e-006 @0.000003545s
[SPICE] transient GMIN stepping at time=3.55225e-006 @0.000003552s
[SPICE] transient GMIN stepping at time=3.55239e-006 @0.000003552s
[SPICE] transient GMIN stepping at time=3.554e-006 @0.000003554s
[SPICE] transient GMIN stepping at time=3.55737e-006 @0.000003557s
[SPICE] transient GMIN stepping at time=3.5574e-006 @0.000003557s
[SPICE] transient GMIN stepping at time=3.5574e-006 @0.000003557s
[SPICE] transient GMIN stepping at time=3.55753e-006 @0.000003558s
[SPICE] transient GMIN stepping at time=3.55908e-006 @0.000003559s
[SPICE] transient GMIN stepping at time=3.55908e-006 @0.000003559s
[SPICE] transient GMIN stepping at time=3.55911e-006 @0.000003559s
[SPICE] transient GMIN stepping at time=3.56129e-006 @0.000003561s
[SPICE] transient GMIN stepping at time=3.56134e-006 @0.000003561s
[SPICE] transient GMIN stepping at time=3.56844e-006 @0.000003568s
[SPICE] transient GMIN stepping at time=3.57054e-006 @0.000003571s
[SPICE] transient GMIN stepping at time=3.57179e-006 @0.000003572s
[SPICE] transient GMIN stepping at time=3.57191e-006 @0.000003572s
[SPICE] TRAN:  Timestep too small; timestep = 1.25e-019: trouble with node #U1_DRIVER1_Q1#collector. @0.000003572s

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Answer 1

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>006 这个报错信息是由于SPICE仿真过程中出现了transient GMIN stepping错误，并且提示说仿真不是实时运行，因为CPU负载过高。这通常意味着仿真过程中出现了数值不稳定的情况，可能是因为电路的某些部分设计的不够稳定，或者仿真设置的不合理导致。 解决这个问题的方法可以尝试以下几点：

1. 调整仿真参数：尝试调整仿真的时间步长、GMIN参数等，可以通过逐步减小时间步长的方式来查找问题所在。
2. 优化电路设计：检查电路设计中可能存在的不稳定因素，比如电容、电感、阻抗匹配等，尽量使电路设计更加稳定。
3. 检查仿真模型：确保使用的元件模型和参数都是准确的，避免模型误差导致仿真错误。 下面是一个示例代码，使用Python的SKiDL库进行简单的电路仿真：

from skidl import *
reset()  # 清空之前定义的电路
# 定义一个简单的RC电路
R1 = Part('device', 'R', value='1k')
C1 = Part('device', 'C', value='1u')
V1 = Part('device', 'V', value='1')
N_1, N_2 = Net(), Net()
R1 & N_1 & C1
V1 & N_2 & GND
# 定义仿真器
from PySpice.Probe.Plot import plot
from PySpice.Doc.ExampleTools import find_libraries
lib_path = find_libraries()
spice_library = SPICE_LIBRARY
sim = circuit.simulator(temperature=25, nominal_temperature=25)
analysis = sim.transient(step_time=1@u_us, end_time=10@u_ms)
# 进行仿真
result = analysis(N_2)
plot(result)

通过调整仿真参数和电路设计，可以逐步解决SPICE仿真中出现的GMIN stepping错误。