Insulated state detection device

1. An insulated state detection device comprising:

a positive-side input terminal and a negative-side input terminal that are respectively connected to a positive-side power line and a negative-side power line of an output of a predetermined high-voltage DC power supply;

a ground electrode;

a ground fault resistance value calculation unit that calculates an insulation resistance value between the ground electrode and the positive-side power line and between the ground electrode and the negative-side power line based on measured values related to a charging voltage of a flying capacitor;

a measuring state identification unit that identifies presence or absence of abnormality on at least one measurement condition affecting the measured values;

a timing information generation unit that generates a timing information, automatically updates a value of the timing information by a predetermined value each time the ground fault resistance value calculation unit generates a new insulation resistance value, and reflects a state of the identification of the measuring state identification unit on the value of the timing information; and

an information transmission unit that transmits the insulation resistance value calculated by the ground fault resistance value calculation unit and the timing information generated by the timing information generation unit to a host control device.

2. The insulated state detection device according to claim 1 , wherein the measuring state identification unit initializes the value of the timing information generated by the timing information generation unit when a predetermined measurement disabled state is detected or when the measurement disabled state is released, and

the ground fault resistance value calculation unit stops calculating a new insulation resistance value in the measurement disabled state.

3. The insulated state detection device according to claim 1 , wherein the measuring state identification unit stops updating the value of the timing information generated by the timing information generation unit and maintains the same value when a predetermined measuring abnormal state is detected, and

the ground fault resistance value calculation unit stops calculating a new insulation resistance value in the measuring abnormal state.

4. The insulated state detection device according to claim 1 , wherein the measuring state identification unit stops updating the value of the timing information generated by the timing information generation unit when a temporary measuring abnormal state is detected and maintains the timing information at the same value until returning to a normal state, and

the ground fault resistance value calculation unit stops calculating a new insulation resistance value until returning to a normal state after the temporary measuring abnormal state is detected.

5. The insulated state detection device according to claim 1 , wherein the measuring state identification unit initializes the value of the timing information generated by the timing information generation unit when a reset state caused by an ignition signal transmitted from a vehicle is detected.

6. The insulated state detection device according to claim 1 , wherein the information transmission unit transmits the information of the insulation resistance value calculated in the last together with the timing information each time a predetermined time elapses in a state where the ground fault resistance value calculation unit stops calculating a new insulation resistance value.

7. The insulated state detection device according to claim 1 , wherein the measuring state identification unit detects abnormality of power supply voltage applied to at least the positive-side power line or the negative-side power line, based on the measured value of voltage of the flying capacitor in a predetermined condition.