Method and apparatus for charging a battery
First Claim
1. An apparatus for charging a battery, comprising:
- a constant current circuit,a constant voltage circuit anda control circuit;
wherein the control circuit is adapted tocontrol the constant current circuit to perform constant current charging to the battery;
after a battery voltage during the constant current charging reaches a preset charging limited voltage, control the constant voltage circuit to perform constant voltage charging to the battery; and
if a charging current during the constant voltage charging becomes smaller than or equal to a predetermined threshold, start to charge the battery by pulse charging until an open circuit voltage of the battery is larger than or equal to a preset voltage threshold;
a clock circuit;
wherein the control circuit further comprises;
a first unit, adapted to stop the charging to the battery and trigger the clock circuit to start timing; and
a second unit, adapted to, when a timing period reaches a preset off time, clear the timing of the clock circuit and determine whether an open circuit voltage of the battery is larger than or equal to the preset voltage;
if the open circuit voltage is larger than or equal to the preset voltage, terminate the charging;
otherwise, control the constant voltage circuit to perform the constant voltage charging to the battery and meanwhile trigger the clock circuit to start timing, and when a charging time reaches a predetermined pulse-charging-on time, clear the timing of the clock circuit, and trigger the first unit to stop charging the battery and to trigger the clock circuit to start timing;
wherein a voltage used when the constant voltage circuit performs the constant voltage charging to the battery is the charging limited voltage.
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Accused Products
Abstract
A method and apparatus for charging a battery is provided. The apparatus includes: a constant current circuit, a constant voltage circuit and a control circuit. The control circuit is adapted to control the constant current circuit to perform constant current charging to the battery; after a battery voltage during the constant current charging reaches a preset charging limited voltage, control the constant voltage circuit to perform constant voltage charging to the battery; after a charging current during the constant voltage charging becomes smaller than or equal to a predetermined threshold, control the battery to be charged by pulse charging until an open circuit voltage of the battery is larger than or equal to a preset voltage threshold.
10 Citations
11 Claims
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1. An apparatus for charging a battery, comprising:
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a constant current circuit, a constant voltage circuit and a control circuit; wherein the control circuit is adapted to control the constant current circuit to perform constant current charging to the battery; after a battery voltage during the constant current charging reaches a preset charging limited voltage, control the constant voltage circuit to perform constant voltage charging to the battery; and if a charging current during the constant voltage charging becomes smaller than or equal to a predetermined threshold, start to charge the battery by pulse charging until an open circuit voltage of the battery is larger than or equal to a preset voltage threshold; a clock circuit; wherein the control circuit further comprises; a first unit, adapted to stop the charging to the battery and trigger the clock circuit to start timing; and a second unit, adapted to, when a timing period reaches a preset off time, clear the timing of the clock circuit and determine whether an open circuit voltage of the battery is larger than or equal to the preset voltage;
if the open circuit voltage is larger than or equal to the preset voltage, terminate the charging;
otherwise, control the constant voltage circuit to perform the constant voltage charging to the battery and meanwhile trigger the clock circuit to start timing, and when a charging time reaches a predetermined pulse-charging-on time, clear the timing of the clock circuit, and trigger the first unit to stop charging the battery and to trigger the clock circuit to start timing;wherein a voltage used when the constant voltage circuit performs the constant voltage charging to the battery is the charging limited voltage. - View Dependent Claims (2, 3, 4, 5, 11)
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6. A method for charging a battery, comprising:
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A) performing constant current charging to the battery; B) performing constant voltage charging after a battery voltage during the constant current charging reaches a charging limited voltage of the battery; and C) if a charging current during the constant voltage charging becomes smaller than or equal to a predetermined threshold, starting to perform pulse charging to the battery until an open circuit voltage of the battery is larger than or equal to a preset voltage threshold; wherein the performing the pulse charging to the battery until the open circuit voltage of the battery is larger than or equal to the preset voltage threshold comprises; C1, stopping charging the battery; and C2, when an off time that the charging is stopped reaches a preset off time, determining whether the open circuit voltage of the battery is larger than or equal to the preset voltage threshold;
if the open circuit voltage of the battery is larger than or equal to the preset voltage threshold, terminating the charging;
otherwise, performing the constant voltage charging to the battery, and returning to step C1 when a charging time reaches a pulse-charging-on time;wherein the performing the constant voltage charging to the battery comprises; performing the constant voltage charging to the battery with the charging limited voltage. - View Dependent Claims (7, 8, 9, 10)
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Specification