Protective circuits for secondary battery packs
First Claim
1. A protective circuit for a secondary battery pack having a plurality of batteries, comprising:
- a sampling circuit that includes a sequential pulse generator to generate gating pulses for selecting one or more of the plurality of batteries for inspection, and to generate sampling pulses for inspecting the selected batteries at predetermined time intervals, wherein the width of the sampling pulses are set at ½
to ¾
of a width of corresponding gating pulses;
a selection circuit to receive said gating pulses and select a battery in the battery pack;
a reference voltage source providing one or more reference levels;
a plurality of voltage comparators each receiving one of the reference levels to compare with the level of the selected battery and generating one or more compared levels;
a battery status decision circuit connected to the comparators generating control signals as a function of the compared levels; and
a battery charging/discharging control circuit for controlling the charging or discharging of the selected battery in response to the control signals.
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Accused Products
Abstract
This invention discloses a charging/discharging protective circuit for a secondary battery pack, having an over-charging/discharging voltage comparator, a reference voltage source and a battery status decision circuit. There is also a sampling circuit having a sequential pulse generator for generating pulses for selecting one of the batteries in the battery pack for testing purposes. The pulse generator provides M-channel gating pulses to the selection circuit of the battery under test and provides sampling pulses to the over-charging/discharging voltage comparators. The reference voltage source has a regulated output circuit. This invention uses time division inspection methods to provide a cost-effective solution for inspecting batteries in a battery pack.
13 Citations
18 Claims
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1. A protective circuit for a secondary battery pack having a plurality of batteries, comprising:
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a sampling circuit that includes a sequential pulse generator to generate gating pulses for selecting one or more of the plurality of batteries for inspection, and to generate sampling pulses for inspecting the selected batteries at predetermined time intervals, wherein the width of the sampling pulses are set at ½
to ¾
of a width of corresponding gating pulses;a selection circuit to receive said gating pulses and select a battery in the battery pack; a reference voltage source providing one or more reference levels; a plurality of voltage comparators each receiving one of the reference levels to compare with the level of the selected battery and generating one or more compared levels; a battery status decision circuit connected to the comparators generating control signals as a function of the compared levels; and
a battery charging/discharging control circuit for controlling the charging or discharging of the selected battery in response to the control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17, 18)
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12. A protective circuit for a secondary battery pack having a plurality of batteries, comprising:
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a sampling circuit that includes a sequential pulse generator to generate gating pulses for selecting one or more of the plurality of batteries for inspection, and to generate sampling pulses for inspecting the selected batteries at predetermined time intervals, wherein the width of the sampling pulses are set at ½
to ¾
of a width of corresponding gating pulses;a selection circuit to receive the gating pulses and select a battery in the battery pack; a reference voltage source providing one or more reference levels, wherein the reference voltage source has a regulated output circuit allowing the calibration of protection thresholds; a plurality of voltage comparators each receiving one of the reference levels to compare with the level of the selected battery and generating one or more compared levels; a battery status decision circuit connected to the comparators generating control signals as a function of the compared levels; and a battery charging/discharging control circuit for controlling the charging or discharging of the selected battery in response to the control signals. - View Dependent Claims (13, 14, 15, 16)
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Specification