BALANCER CIRCUIT AND BATTERY UNIT USING SAME
First Claim
1. A balancer circuit connected to a battery pack in which a plurality of secondary batteries are connected in series, comprising:
- a capacitance element, anda switching portion that performs a switchover of a connection state of both ends of the capacitance element between states which include;
a state where both ends of the capacitance element are connected to both ends of any one of the secondary batteries; and
a state where both ends of the capacitance element are connected to both ends of another one of the secondary batteries,wherein the balancer circuit corrects a voltage balance state among the plurality of secondary batteries by executing a switching operation that performs repeatedly the switchover, andthe balancer circuit includes a detection portion that detects the balance state by detecting a size of an overshoot component of a voltage waveform at a point connected to the capacitance element.
1 Assignment
0 Petitions
Accused Products
Abstract
A balancer circuit connected to a battery pack having a plurality of secondary cells connected in series, and comprising: a capacitance element; and a switching unit that switches the connection state for both ends of the capacitance element between a state in which same are connected to both ends of one of the secondary cells and a state in which same are connected to both ends of another secondary cell. The balancer circuit corrects the balance between the voltages for the plurality of secondary cells by executing a switching operation that repeats said switching, and comprises a detection unit that detects said state of balance by detecting the size of the overshoot component in a voltage waveform at sites connected to the capacitance element.
-
Citations
8 Claims
-
1. A balancer circuit connected to a battery pack in which a plurality of secondary batteries are connected in series, comprising:
-
a capacitance element, and a switching portion that performs a switchover of a connection state of both ends of the capacitance element between states which include;
a state where both ends of the capacitance element are connected to both ends of any one of the secondary batteries; and
a state where both ends of the capacitance element are connected to both ends of another one of the secondary batteries,wherein the balancer circuit corrects a voltage balance state among the plurality of secondary batteries by executing a switching operation that performs repeatedly the switchover, and the balancer circuit includes a detection portion that detects the balance state by detecting a size of an overshoot component of a voltage waveform at a point connected to the capacitance element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification