Abstract: Electric equipment includes: a power transmission/reception unit which transmits/receives electric power between a first assembled battery and a second assembled battery; a first power line which is connected to a positive electrode terminal of the first assembled battery and connected to a positive electrode terminal of the second assembled battery via the power transmission/reception unit; a second power line which is connected to a negative electrode terminal of the first assembled battery and connected to a negative electrode terminal of the second assembled battery via the power transmission/reception unit; and a limitation unit which is arranged between the positive electrode terminal of the first assembled battery and the first power line or between the negative electrode terminal of the first assembled battery and the second power line, and limits transmission/reception of electric power via the power transmission/reception unit between the first assembled battery and the second assembled battery.

Abstract: A first electric storage device includes a first switching unit disposed between a wiring and the first electric storage unit and configured to switch an electrical connection relationship between the wiring and the first electric storage unit based on a voltage difference between the wiring and the first electric storage unit. A second electric storage device includes a second switching unit disposed between the wiring and the second electric storage unit and configured to switch an electrical connection relationship between the wiring and the second electric storage unit based on a voltage difference between the wiring and the second electric storage unit. A charge end voltage of the first electric storage unit is equal to or less than a full charging voltage of the first electric storage unit, and is greater than a charge end voltage of the second electric storage unit.

Abstract: An electric storage system to which a first electric storage device and a second electric storage device connected in parallel can be mounted decides a rated voltage of the first electric storage device in an electric storage system having at least one of (A) a discharge standby stage and (B) a charge standby stage. It decides a large and small relationship between the rated voltage of the electric storage device for which at least one of (i) an accumulated time, (ii) an accumulated power amount, and (iii) an accumulated number is decided to be made higher among the first electric storage device and the second electric storage device, and the rated voltage of the other electric storage device. It decides the rated voltage of the first electric storage device such that the large and small relationship decided in the large and small relationship deciding step is achieved.

Abstract: An electric storage system to which a first electric storage device and a second electric storage device connected in parallel can be mounted decides a rated voltage of the first electric storage device in an electric storage system having at least one of (A) a discharge standby stage and (B) a charge standby stage. It decides a large and small relationship between the rated voltage of the electric storage device for which at least one of (i) an accumulated time, (ii) an accumulated power amount, and (iii) an accumulated number is decided to be made higher among the first electric storage device and the second electric storage device, and the rated voltage of the other electric storage device. It decides the rated voltage of the first electric storage device such that the large and small relationship decided in the large and small relationship deciding step is achieved.

Abstract: A switching power supply circuit, which can respond to a rapid and large change in a load quickly and stably and ensure a power supply output having a predetermined voltage, is provided. In the power supply circuit which supplies an input current to a load while switching the input current periodically and controls an output voltage Vo supplied to the load to a predetermined target value by controlling an ON/OFF time ratio (t1/t2) of the switching variably, a control of the ON/OFF time ratio is performed for every one current supply cycle T independently.

Abstract: A switching power supply circuit, which can respond to a rapid and large change in a load quickly and stably and ensure a power supply output having a predetermined voltage, is provided. In the power supply circuit which supplies an input current to a load while switching the input current periodically and controls an output voltage Vo supplied to the load to a predetermined target value by controlling an ON/OFF time ratio (t1/t2) of the switching variably, a control of the ON/OFF time ratio is performed for every one current supply cycle T independently.

Abstract: A transportable telephone exchange apparatus which includes small capacity telephone exchange facilities which are divided into a plurality of containers for transportation to an installation site by boat or by vehicle, has an improved frame packing density within the frame and is constructed to facilitate maintenance.