Abstract: An object of the present invention is to provide a capacitor and a capacitor module having a long life and capable of a stable action. Therefore, an electrolytic solution L obtained by dissolving an electrolyte salt having a lower hydrolyzability and a higher reaction potential in an electrode than an amidine salt containing a cation which is an imidazolium in a solvent and a sub solvent that reduces resistance of the electrolytic solution is packed in a cell. The electrolyte salt is a quaternary ammonium salt, the solvent is propylene carbonate, and the sub solvent is dimethyl carbonate. The quaternary ammonium salt is triethylmethylammonium tetrafluoroborate or azacyclobutane-1-spiro-1?-azacyclobutyl tetrafluoroborate. A pressure regulating valve 6 for regulating an inner pressure in the cell is disposed. A portion of the electrolytic solution L to be vaporized during use is packed in the cell as an excessive electrolytic solution in advance.

Abstract: The degradation of an electrical storage device 30 such as a capacitor can be determined by a system which is not an external device but is installed in hybrid construction equipment 1 in a state that the electrical storage device 30 such as a capacitor is mounted. To achieve this objective, it is at least checked that the working machine has stopped. Next, when it has been checked that the working machine has stopped, a degradation state determination time control mode is entered, a motor-generator is driven at the prescribed rotational speed and the prescribed torque, and the electrical storage device rises from the prescribed start charging voltage to the prescribed end charging voltage (Step 102).

Abstract: A leakage detection can be correctly performed both in a DC high voltage circuit and in an AC high voltage circuit in a vehicle-mounted power supply system. Under a state where a contactor 17 is turned off, all IGBT elements (switching elements) 76 in an IGBT inverter circuit 12 are turned on, and an AC signal Vs is applied to an applying point P. Then, a voltage measured at a voltage measurement point Q is compared with a threshold value to detect whether or not the leakage exists.

Abstract: The degradation of an electrical storage device 30 such as a capacitor can be determined by a system which is not an external device but is installed in hybrid construction equipment 1 in a state that the electrical storage device 30 such as a capacitor is mounted. To achieve this objective, it is at least checked that the working machine has stopped. Next, when it has been checked that the working machine has stopped, a degradation state determination time control mode is entered, a motor-generator is driven at the prescribed rotational speed and the prescribed torque, and the electrical storage device rises from the prescribed start charging voltage to the prescribed end charging voltage (Step 102).

Abstract: A leakage detection can be correctly performed both in a DC high voltage circuit and in an AC high voltage circuit in a vehicle-mounted power supply system. Under a state where a contactor 17 is turned off, all IGBT elements (switching elements) 76 in an IGBT inverter circuit 12 are turned on, and an AC signal Vs is applied to an applying point P. Then, a voltage measured at a voltage measurement point Q is compared with a threshold value to detect whether or not the leakage exists.

Abstract: It is an object of the present invention to provide a high efficiency hybrid power supply system that permits a power type power supply device such as a capacitor to be utilized effectively, and that makes it possible to even the burden on an energy type power supply device such as a storage cell. A capacitor 21 is connected to system voltage lines 26 and 27 which are connected to a load 30, and a body formed by a serial connection between a large-capacity storage cell 22 and the output terminal of a voltage controller 23 is connected in parallel with this capacitor 21. The voltage Vb of the storage cell 22 is substantially constant. The voltage controller 23 is a DC/DC converter, for example, the output voltage Vv of which is variable. A system controller 25 changes the system voltage Vs by changing the output voltage Vv of the voltage controller 23.

Abstract: It is an object of the present invention to provide a high efficiency hybrid power supply system that permits a power type power supply device such as a capacitor to be utilized effectively, and that makes it possible to even the burden on an energy type power supply device such as a storage cell. A capacitor 21 is connected to system voltage lines 26 and 27 which are connected to a load 30, and a body formed by a serial connection between a large-capacity storage cell 22 and the output terminal of a voltage controller 23 is connected in parallel with this capacitor 21. The voltage Vb of the storage cell 22 is substantially constant. The voltage controller 23 is a DC/DC converter, for example, the output voltage Vv of which is variable. A system controller 25 changes the system voltage Vs by changing the output voltage Vv of the voltage controller 23.