A DC-to-ground insulation detection circuit and a DC-to-ground insulation detection method
A technology of ground insulation and detection circuit, applied in impedance measurement and other directions, which can solve the problems of complicated circuit structure calculation method and many electronic components, etc.
Active Publication Date: 2018-12-28
SUNGROW POWER SUPPLY CO LTD
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The existing DC-to-ground insulation detection circuit has many electronic components, and the circuit structure and calculation method are complicated
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[0092] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0093] The existing DC-to-ground insulation detection circuit has many electronic components, and the circuit structure and calculation method are complicated. Generally, the existing technology requires many branches, and the switching element needs to withstand the voltage of the entire DC power supply, which is easy to damage the detection switch; the voltage sampling adopts the negative terminal voltage dividing resistor of the common power supply, and the ...
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The invention discloses a DC ground insulation detection circuit and a DC ground insulation detection method. The DC ground insulation detection circuit comprises a DC power supply, a first branch, a second branch and a third branch. The first end of the first branch is connected with the positive electrode of the DC power supply, and the second end is connected with a virtual signal ground port. The first end of the second branch is connected with the negative electrode of the DC power supply, and the second end is connected with the virtual signal ground port. The first end of the third branch is connected with the ground end, and the second end is connected with the virtual signal ground port. The first branch or the second branch or the third branch is provided with a detection switch. The branch of the detection switch is provided with multiple resistor elements. A first equation relation and a second equation relation are acquired by simply switching the switch state of the detection switch, and negative electrode ground insulation impedance R- and positive electrode ground insulation impedance R+ can be calculated according to the first equation relation and the second equation relation so that the circuit structure and the calculation method are simple.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically, to a DC-to-ground insulation detection circuit and a DC-to-ground insulation detection method. Background technique [0002] The photovoltaic grid-connected power generation system converts the direct current generated by solar cells into alternating current with the same frequency and phase as the voltage of the power grid. Among them, the photovoltaic inverter is an important component of the photovoltaic grid-connected power generation system. [0003] In order to ensure the safety and stability of the photovoltaic grid-connected power generation system, it is necessary to conduct a DC-to-ground insulation test on the photovoltaic modules before grid-connection, and to detect the ground-to-ground insulation resistance. The existing DC-to-ground insulation detection circuit has many electronic components, and the circuit structure and calculation me...
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IPC IPC(8): G01R27/18
CPCG01R27/18
Inventor 江涛王晓飞李飞吴晓磊
Owner SUNGROW POWER SUPPLY CO LTD