发明名称 |
Vehicular insulation resistance detection apparatus |
摘要 |
The vehicular insulation resistance detection apparatus includes a cyclic signal generating unit that generates a cyclic signal, a first resistor that has one end to which the cyclic signal is applied, a first capacitor that has one end connected to the other end of the first resistor and the other end connected to a high-voltage circuit, a second capacitor that has one end connected to the other end of the first resistor, a second resistor that has one end connected to the other end of the second capacitor and the other end connected to a low-voltage ground that is a circuit ground of a low-voltage circuit, a series circuit that includes a diode and a third resistor connected in series, and is connected in parallel with the second capacitor, this diode having a forward direction coincident with a direction from the other end of the second capacitor to the one end of the second capacitor, a voltage detection unit that detects a voltage between the low-voltage ground and the other end of the second capacitor as a detection signal, and an insulation resistance detection unit that detects a resistance value of an insulation resistance based on an amplitude of the detection signal. |
申请公布号 |
US8878543(B2) |
申请公布日期 |
2014.11.04 |
申请号 |
US201113498068 |
申请日期 |
2011.05.27 |
申请人 |
Panasonic Corporation |
发明人 |
Morimoto Naohisa |
分类号 |
G01R31/00;G01R27/14;B60L3/00;G01R27/18;G01R31/02 |
主分类号 |
G01R31/00 |
代理机构 |
McDermott Will & Emery LLP |
代理人 |
McDermott Will & Emery LLP |
主权项 |
1. A vehicular insulation resistance detection apparatus that detects an insulation resistance between a low-voltage circuit and a high-voltage circuit, comprising:
a cyclic signal generating unit that generates a cyclic signal which has a preset frequency; a first resistor that has one end which is connected to the cyclic signal generating unit, the cyclic signal being applied to the one end; a first capacitor that has one end which is connected to an other end of the first resistor and an other end which is connected to the high-voltage circuit; a second capacitor that has one end which is connected to the other end of the first resistor; a second resistor that has one end which is connected to an other end of the second capacitor and an other end which is connected to a low-voltage ground that is a circuit ground of the low-voltage circuit; a series circuit that includes a diode and a third resistor connected in series, and is connected in parallel with the second capacitor, the diode having a forward direction coincident with a direction from the other end of the second capacitor to the one end of the second capacitor; a voltage detection unit that detects a voltage between the low-voltage ground and the other end of the second capacitor as a detection signal; and an insulation resistance detection unit that detects a resistance value of the insulation resistance based on an amplitude of the detection signal. |
地址 |
Osaka JP |