Energy transfer circuit, and electricity storage system
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorMasaaki Kuranuki
Life of this patent
Estimating the term…
Abstract
Cell selection circuit is provided between n cells connected in series, where n is an integer of 2 or more, and inductor, and is provided at both ends of the selected cell and both ends of inductor can be conductive. Clamp circuit includes at least one clamp switch for forming a closed loop including inductor in a state where cell selection circuit does not select any cells. Current detection circuit detects the value of the current flowing through inductor. Low-pass filter band-limits the detection value. Overcurrent detection circuit activates the protection of inductor when the band-limited detection value exceeds the threshold.
Claims17
An energy transfer circuit comprising:
- an inductor;
- a cell selection circuit provided between the inductor and n cells connected in series, where n is an integer of 2 or more, the cell selection circuit being configured to conduct between (i) both ends of a selected cell and (ii) both ends of the inductor, the selected cell being at least one cell selected from the n cells connected in series;
- a clamp circuit including at least one clamp switch, the at least one clamp switch forming a closed loop including the inductor in a state where the cell selection circuit does not select any cells;
- a current detection circuit configured to detect a value of a current flowing through the inductor;
- a low-pass filter configured to band-limit a detection value detected by the current detection circuit;
- an overcurrent detection circuit configured to compare the detection value band-limited by the low-pass filter with an overcurrent protection threshold for the inductor and, when the detection value exceeds the overcurrent protection threshold, to output an abnormality stop signal to activate protection of the inductor;
- and
- a controller configured to perform, in response to detecting the abnormality stop signal, a protecting operation comprising at least one of:
- (1) controlling a clamp state in which a clamp path in which both ends of the inductor are connected to each other via the at least one clamp switch is created, to flow a clamp current between both ends of the inductor, thereby circulating, in the clamp path, the current flowing through the inductor;
- or
- (2) stopping an operation of the energy transfer circuit.
An energy transfer circuit comprising:
- an inductor;
- a module selection circuit provided between m modules connected in series, where m is an integer of 2 or more, and the inductor and configured to conduct both ends of a selected module including any one of the m modules or a plurality of modules connected in series, and both ends of the inductor;
- a clamp circuit including a clamp switch for forming a closed loop including the inductor in a state where the module selection circuit not selecting any modules;
- a current detection circuit configured to detect a value of a current flowing through the inductor;
- a low-pass filter configured to band-limit a detection value detected by the current detection circuit;
- and
- an overcurrent detection circuit configured to compare the detection value band-limited by the low-pass filter with an overcurrent protection threshold for the inductor and, when the detection value exceeds the overcurrent protection threshold, to output an abnormality stop signal to activate protection of the inductor;
- and
- a controller configured to perform, in response to detecting the abnormality stop signal, a protecting operation comprising at least one of:
- (1) controlling a clamp state in which a clamp path in which both ends of the inductor are connected to each other via the at least one clamp switch is created, to flow a clamp current between both ends of the inductor, thereby circulating, in the clamp path, the current flowing through the inductor;
- or
- (2) stopping an operation of the energy transfer circuit.
Dependencies are inferred from the claim text.