| 摘要 |
A ground-resistance detection device, which is coupled to a power system including a first power line, a second power line, and a protective earth, includes a ground-resistance detection circuit and a controller. The ground-resistance detection circuit includes a first input node and a second input node. The first input node is coupled to either the first power line or the second power line. The second input node is coupled to a ground terminal. The ground-resistance detection circuit generates a DC output voltage according to the voltage of the first input node, the voltage of the second input node, and the DC reference voltage. The controller determines the ground resistance between the protective earth and the ground terminal according to the DC reference voltage and the DC output voltage. |
| 主权项 |
1. A ground-resistance detection device, coupled to a power system, wherein the power system comprises a first power line, a second power line, and a protective earth, comprising:
a ground-resistance detection circuit, comprising a first input node and a second input node, wherein the first input node is coupled to either the first power line or the second power line, and the second input node is coupled to a ground terminal, wherein the ground-resistance detection circuit generates a DC output voltage (VOUT) according to a voltage of the first input node, a voltage of the second input node, and a DC reference voltage (VREF); and a controller, determining a ground resistance (RPE) between the protective earth and the ground terminal according to the DC reference voltage and the DC output voltage. |
