Device for charging a secondary battery having interrupt means to prevent overcharging
First Claim
1. A charging equipment for charging a secondary battery, including:
- output control means for controlling a charging operation such that a constant-current charging is carried out for a voltage below a predetermined voltage and a constant-voltage charging is carried out for a voltage above the predetermined voltage;
switching means for interrupting a charging current from flowing into the secondary battery at a predetermined period;
charging control means for controlling the operation of said switching means to control the charging;
voltage detection means for detecting a voltage at a position near to said switching means before a charging current is interrupted and a voltage between said switching means and the secondary battery after the charging current is interrupted, said charging control means controlling the operation of the switching means on the basis of an output of said voltage detection means.
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Accused Products
Abstract
A charging equipment for charging a secondary battery in a constant-current and constant-voltage mode, including a switching device for interrupting a charging current from flowing into the secondary battery at a predetermined period, a charging control device for controlling the operation of the switching device to control the charging, and a voltage detection device for detecting a voltage at a position near to the switching device (e.g., at the input or output side of the switching device) before the charging current is interrupted and a voltage between the switching device and the secondary battery after the charging current is interrupted, thereby calculating a voltage difference between the voltages, the charging control device controlling the operation of the switching device on the basis of the voltage difference of the voltage detection device.
72 Citations
11 Claims
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1. A charging equipment for charging a secondary battery, including:
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output control means for controlling a charging operation such that a constant-current charging is carried out for a voltage below a predetermined voltage and a constant-voltage charging is carried out for a voltage above the predetermined voltage; switching means for interrupting a charging current from flowing into the secondary battery at a predetermined period; charging control means for controlling the operation of said switching means to control the charging; voltage detection means for detecting a voltage at a position near to said switching means before a charging current is interrupted and a voltage between said switching means and the secondary battery after the charging current is interrupted, said charging control means controlling the operation of the switching means on the basis of an output of said voltage detection means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A charging equipment for charging a secondary battery, comprising:
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charging means for supplying a rectified and smoothed charging current; interrupting means for selectively interrupting the charging current from passing therethrough to the secondary battery; voltage detection means for comparing voltages before and after the interruption of the charging current by said interrupting means to detect a voltage difference between the voltages; and charging control means for terminating the charging to the secondary battery when the voltage difference detected by said voltage detection means comprises an A/D converter, and said charging control means comprises a CPU; and further comprising selection means for selecting one of the voltages before and after the interruption of the charging current and outputting the selected voltage to said voltage detection means. - View Dependent Claims (8, 9)
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10. A charging method for charging a secondary battery, comprising the steps of:
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converting an alternating current to a rectified and smoothed charging current; selectively interrupting the rectified and smoothed charging current from flowing into the secondary battery; detecting voltages before and after the interruption of the charging current to detect a voltage difference between the voltages; comparing the voltage difference with a predetermined value; and terminating the charging to the secondary battery when the voltage difference is below the predetermined value. - View Dependent Claims (11)
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Specification