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AssigneeSeiko Instruments Inc.
InventorsKazuaki Sano, Kiyoshi Yoshikawa, Toshiyuki Koike, Yoshihisa Tange, Atsushi Sakurai
Estimating the term…
A charge and discharge control circuit which accommodates pulsed charge and pulsed discharge and can control charge and discharge of a secondary battery with safety, and a rechargeable power supply device having the same built therein are provided. The charge and discharge control circuit includes a delay time switching circuit for shortening a delay time of overcharge detection after charge inhibition is canceled. When overcharge is detected after the charge inhibition is canceled, the charge is inhibited in a delay time which is shorter than a normal delay time of the overcharge detection.
A charge and discharge control circuit for controlling charge and discharge of a secondary battery, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: accumulators combined with arrangements for…
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: structural combination with electronic…
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: methods for charging or discharging
Including safety or protection arrangements: using battery or load disconnect circuits
About 2 years 11 months of term left · ends 22 Sep 2029 (estimated)
1. Field of the Invention
The present invention relates to a charge and discharge control circuit for controlling charge and discharge of a secondary battery, and to a rechargeable power supply device having the charge and discharge control circuit built therein.
2. Description of the Related Art
In the accompanying drawings:
FIG. 1 is a block diagram of a charge and discharge control circuit and a rechargeable power supply device having the same built therein according to an embodiment of the present invention;
FIG. 2 is a block diagram illustrating an exemplary delay circuit of the charge and discharge control circuit according to this embodiment;
FIG. 1 is a block diagram of a charge and discharge control circuit and a rechargeable power supply device having the same built therein according to an embodiment of the present invention.
A rechargeable power supply device 1 according to this embodiment includes a secondary battery 2, a charge and discharge control circuit 3, and a charge and discharge current control circuit 10. The charge and discharge control circuit 3 includes a voltage detection circuit 5, a delay circuit 6, a delay time switching circuit 7, and a control signal output circuit 8. The charge and discharge current control circuit 10 includes a transistor 11 for discharge control and a transistor 12 for charge control.
Terminals at both ends of the secondary battery 2 are connected to voltage detection terminals of the charge and discharge control circuit 3, and the charge and discharge current control circuit 10 is connected to control signal output terminals of the charge and discharge control circuit 3. The charge and discharge control circuit 3 includes the voltage detection circuit 5 for detecting an overcharge voltage and an overdischarge voltage across the secondary battery 2. The voltage detection circuit 5 according to this embodiment detects the overcharge voltage. When the voltage detection circuit 5 detects the overcharge voltage, a detection signal is input to the delay circuit 6. After a certain delay time, the delay circuit 6 outputs the detection signal to the control signal output circuit 8. According to the detection signal, the control signal output circuit 8 outputs a charge/discharge control signal to the charge and discharge current control circuit 10.