Abstract: It is preferable to measure a voltage difference between two electric storage cells with a higher precision while suppressing costs of a balance correction circuit. A balance correction apparatus comprises a first balance correction section which equalizes voltages of two electric storage cells among a plurality of electric storage cells connected in series, a second balance correction section which equalizes voltages of two electric storage cells among the plurality of electric storage cells and a control section which controls operations of the first balance correction section and the second balance correction section. The control section generates a first control signal which controls operations of the first balance correction section and a second control signal which controls operations of the second balance correction section based on a measurement result of each voltage of the plurality of electric storage cells.

Abstract: Excess voltage is prevented from flowing through an electric storage cell. Included are an inductor, a first switching device, a second switching device and a control section supplying a control signal to control ON/OFF operations of the first switching device and the second switching device, to the first switching device and the second switching device, where the control section supplies the control signal so that the first switching device and the second switching device repeat ON/OFF operations alternately when a voltage of the first electric storage cell and a voltage of the second electric storage cell are lower than a predetermined value, and the control section supplies a control signal to stop the balance correction apparatus, when at least one of the voltage of the first electric storage cell and the voltage of the second electric storage cell is equal to the predetermined value or larger than the predetermined value.

Abstract: An object of the present invention is to suppress damages to a drive circuit for a switching device due to a counter electromotive force of an inductor. A balance correcting apparatus includes: an inductor; a first switching device; a second switching device; a control signal generating unit that has a first reference voltage input terminal electrically connected to the other end of the first electricity storage cell and a second reference voltage input terminal electrically connected to the other end of the second electricity storage cell, and allows the first switching device and the second switching device to perform an ON-OFF operation alternately; and a voltage stabilizing circuit that keeps a voltage difference between the voltages of the first reference voltage input terminal and the second reference voltage input terminal to be within a predetermined range.

Abstract: A balance correcting circuit is prevented from moving charges from a low-voltage electricity storage cell to a high-voltage electricity storage cell in a electricity storage system. The balance correcting circuit includes an inductor, a first switching device, a second switching device, and a control signal generating unit that supplies a control signal to the first and second switching devices to turn on and off the first and second switching devices so that the first switching device and the second switching device are alternately turned on and off. The control signal generating unit stops generating the control signal when receiving a state transition signal indicating that the electricity storage system transitions to and temporarily stays in a charging state while the electricity storage system is operating.

Abstract: An object of the present invention is to suppress damages to a drive circuit for a switching device due to a counter electromotive force of an inductor. A balance correcting apparatus includes: an inductor; a first switching device; a second switching device; a control signal generating unit that has a first reference voltage input terminal electrically connected to the other end of the first electricity storage cell and a second reference voltage input terminal electrically connected to the other end of the second electricity storage cell, and allows the first switching device and the second switching device to perform an ON-OFF operation alternately; and a voltage stabilizing circuit that keeps a voltage difference between the voltages of the first reference voltage input terminal and the second reference voltage input terminal to be within a predetermined range.

Abstract: Excess current is prevented from flowing through an electric storage cell. an inductor having an end electrically connected to a connection point between an end of the first electric storage cell and an end of the second electric storage cell; a first switching device electrically connected between another end of the inductor and another end of the first electric storage cell; a second switching device electrically connected between the other end of the inductor and another end of the second electric storage cell; and a current restricting device connected in series with the inductor, the current restricting device restricting a current flowing through the inductor once a magnitude of the current flowing through the inductor has exceeded a predetermined value are provided.

Abstract: A balance correcting circuit is prevented from moving charges from a low-voltage electricity storage cell to a high-voltage electricity storage cell in a electricity storage system. The balance correcting circuit includes an inductor, a first switching device, a second switching device, and a control signal generating unit that supplies a control signal to the first and second switching devices to turn on and off the first and second switching devices so that the first switching device and the second switching device are alternately turned on and off. The control signal generating unit stops generating the control signal when receiving a state transition signal indicating that the electricity storage system transitions to and temporarily stays in a charging state while the electricity storage system is operating.