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发明授权
CN107765099B 一种用于测量接地体阻抗的宽频带测试装置和方法 有权

一种用于测量接地体阻抗的宽频带测试装置和方法
摘要：
本发明公开一种用于测量接地体阻抗的宽频带测试装置，包括基于模拟PI调节的激励源；基于模拟PI调节的激励源包括AC/DC变换器、DC/AC变换器、PI调节器、SPWM和比较器；AC/DC变换器的输入端为基于模拟PI调节的激励源的输入端；AC/DC变换器的输出端连接DC/AC变换器的输入端，DC/AC变换器的输出端作为基于模拟PI调节的激励源的输出端；DC/AC变换器的输出端连接比较器的第一输入端，给定电路的输出端连接比较器的第二输入端，比较器的输出端连接PI调节器的输入端，PI调节器的输出端连接AC/DC变换器的控制端；基于DSP的控制器的输入端连接DC/AC变换器的输出端，基于DSP的控制器的两个输出端分别连接给定电路和SPWM的输入端；SPWM的输出端连接DC/AC变换器的控制端。本发明输出的频带较宽为20Hz～30kHz。
摘要（英）：

The invention discloses a wide-band test device for measuring the impendence of a grounding body. The wide-band test device includes an excitation source based on analog PI regulation. The excitationsource based on analog PI regulation includes an AC/DC converter, a DC/AC converter, a PI regulator, an SPWM, and a comparator. The input end of the AC/DC converter is used as the input end of the excitation source based on analog PI regulation. The output end of the AC/DC converter is connected with the input end of the DC/AC converter, and the output end of the DC/AC converter is used as the output end of the excitation source based on analog PI regulation. The output end of the DC/AC converter is connected with a first input end of the comparator, the output end of a given circuit is connected with a second input end of the comparator, the output end of the comparator is connected with the input end of the PI regulator, and the output end of the PI regulator is connected with the control end of the AC/DC converter. The input end of a controller based on DSP is connected with the output end of the DC/AC converter, and the two output ends of the controller based on DSP are respectively connected with the input ends of the given circuit and the SPWM. The output end of the SPWM is connected with the control end of the DC/AC converter. The output band is as wide as 20Hz to 30kHz.

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