INSULATION STATE DETECTING DEVICE

摘要

An insulation state detecting device includes a positive side input terminal connected to a positive side power line of a high voltage DC power supply, a negative side input terminal connected to a negative side power line of the high voltage DC power supply, a ground electrode, a controller that detects insulation states between the positive side power line and the negative side power line and the ground electrode based on a charge voltage of a flying capacitor, and an equilibrium state forming circuit that promotes an operation of transiting a charge state of a positive side electrostatic capacitance between the positive side power line and the ground electrode and a charge state of a negative side electrostatic capacitance between the negative side power line and the ground electrode from non-equilibrium states to equilibrium states.

主权项

1. An insulation state detecting device comprising:
a positive side input terminal connected to a positive side power line of a high voltage DC power supply; a negative side input terminal connected to a negative side power line of the high voltage DC power supply; a ground electrode; a controller that detects insulation states between the positive side power line and the negative side power line and the ground electrode based on a charge voltage of a flying capacitor; and an equilibrium state forming circuit that promotes an operation of transiting a charge state of an electrostatic capacitance of a positive side capacitor between the positive side power line and the ground electrode and a charge state of an electrostatic capacitance of a negative side capacitor between the negative side power line and the ground electrode from non-equilibrium states to equilibrium states, wherein in the non-equilibrium states, amounts of electricity charges on the positive side capacitor and the negative side capacitor fluctuate; and wherein in the equilibrium states, the amounts of electricity charges on the positive side capacitor and the negative side capacitor are not changed.