Method for limiting battery discharging current in battery charger and discharger circuit
First Claim
1. A controller for a single reconfigurable buck/boost power converter couplable to an adapter for receiving power therefrom and couplable to a rechargeable battery which is couplable to deliver power to a load, comprising:
- a first circuit for operating a pair of electronic switches to receive power from the adapter and to charge the rechargeable battery in a buck mode in which power from the adapter flows into the rechargeable battery; and
a second circuit for operating the pair of electronic switches for supplying at least a portion of the power delivered to the load in a boost mode in which power flows in a second direction from the battery to the load and to regulate discharge current from the battery when the battery is supplying power to the load.
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Abstract
A power supply system includes a rechargeable battery to deliver a supply current to a load and a circuit to limit a discharge current when the rechargeable battery is supplying power to the load. The power supply system may further include an integrator for integrating a discharge voltage representing the discharge current that exceeds a predetermined limit, a pulse-width-modulation (PWM) circuit for producing a control signal having a PWM duty cycle representing the discharge voltage, and a driver circuit for delivering the supply current to said load according to said control signal. In one embodiment, a digital register is used to set the battery discharging current limit, in another embodiment an analog circuit is used to set the battery discharging current limit, and in yet another embodiment or a combination of the digital register and analog circuit is used to set the battery discharging current limit.
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Citations
17 Claims
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1. A controller for a single reconfigurable buck/boost power converter couplable to an adapter for receiving power therefrom and couplable to a rechargeable battery which is couplable to deliver power to a load, comprising:
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a first circuit for operating a pair of electronic switches to receive power from the adapter and to charge the rechargeable battery in a buck mode in which power from the adapter flows into the rechargeable battery; and a second circuit for operating the pair of electronic switches for supplying at least a portion of the power delivered to the load in a boost mode in which power flows in a second direction from the battery to the load and to regulate discharge current from the battery when the battery is supplying power to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a single reconfigurable buck/boost power converter couplable to an adapter for receiving power therefrom and couplable to a rechargeable battery which is couplable to deliver power to a load, comprising:
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generating control signals in a first circuit for operating a pair of electronic switches to receive power from the adapter and to charge the rechargeable battery in a buck mode in which power from the adapter flows into the rechargeable battery; generating control signals in a second circuit for operating the pair of electronic switches for supplying at least a portion of the power delivered to the load in a boost mode in which power flows in a second direction from the battery to the load and to regulate discharge current from the battery when the battery is supplying power to the load. - View Dependent Claims (14, 15, 16, 17)
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Specification