Control loop for pulse charging lithium ion cells
First Claim
1. Control circuitry for regulating charging current from a current source to a battery, the battery comprising a positive terminal having a positive terminal voltage associated therewith, a negative terminal, and a battery voltage between the positive and negative terminals, the control circuitry comprising:
- a switch for transmitting the charging current from the current source to the positive terminal of the battery, the switch having a gate terminal;
a charge pump for driving the gate terminal of the switch above the positive terminal voltage;
a comparator stage with hysteresis for gating the charge pump; and
a filtering stage for sensing the battery voltage and driving the comparator stage;
wherein the control circuitry regulates an average value of the battery voltage by pulse width modulating the charging current.
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Accused Products
Abstract
Control circuitry is described for regulating charging current from a current source to a battery. The control circuitry includes a switch for transmitting the charging current from the current source to the positive terminal of the battery. A charge pump drives the gate terminal of the switch above the positive terminal voltage. A comparator stage with hysteresis gates the charge pump. A filtering stage senses the battery voltage and drives the comparator stage. The control circuitry controls the average value of the battery voltage by pulse width modulating the charging current.
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Citations
59 Claims
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1. Control circuitry for regulating charging current from a current source to a battery, the battery comprising a positive terminal having a positive terminal voltage associated therewith, a negative terminal, and a battery voltage between the positive and negative terminals, the control circuitry comprising:
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a switch for transmitting the charging current from the current source to the positive terminal of the battery, the switch having a gate terminal; a charge pump for driving the gate terminal of the switch above the positive terminal voltage; a comparator stage with hysteresis for gating the charge pump; and a filtering stage for sensing the battery voltage and driving the comparator stage; wherein the control circuitry regulates an average value of the battery voltage by pulse width modulating the charging current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. Control circuitry for regulating a power source coupled to a battery for charging, the battery comprising a positive terminal having a positive terminal voltage associated therewith, a negative terminal, and a battery voltage between the positive and negative terminals, the control circuitry comprising:
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a switch for electrically connecting the power source to the battery, the switch having a gate terminal; a drive circuit for driving the gate terminal of the switch; a comparator stage with hysteresis for gating the drive circuit; and a filtering stage for sensing the battery voltage and driving the comparator stage; wherein the control circuitry regulates an average value of the battery voltage by pulse width modulating the power source. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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Specification