METHOD FOR STEPPING CURRENT OUTPUT BY A BATTERY CHARGER
First Claim
1. A battery charger, comprising:
- a power supply circuit receiving an AC input signal and operable to output a DC output signal;
a power supply controller configured to receive a feedback signal indicative of current being output by the power supply circuit via an amplifier and operable to control current output by the power supply circuit in accordance with the feedback signal; and
a charger controller interfaced with the power supply controller and the amplifier to implement a charging method having a stepped output current, where charger controller sets level of the output current by adjusting gain of the amplifier.
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Abstract
A battery charger is provided for implementing a charging method having a stepped output current. The battery charger includes: a power supply circuit that receives an AC input signal and outputs a DC output signal. The power supply circuit includes a power supply controller configured to receive a feedback signal indicative of current being output by the power supply circuit via an amplifier and operates to control current output by the power supply circuit in accordance with the feedback signal. A charger controller is interfaced with the power supply controller to implement a charging method having a stepped output current. The charger controller may set the output current level by adjusting gain of an operational amplifier having a negative feedback configuration with the feedback signal input to a non-inverting input terminal of the operational amplifier, where the charger controller sets the output current level by changing the resistance at an inverting input terminal of the operational amplifier.
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Citations
19 Claims
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1. A battery charger, comprising:
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a power supply circuit receiving an AC input signal and operable to output a DC output signal; a power supply controller configured to receive a feedback signal indicative of current being output by the power supply circuit via an amplifier and operable to control current output by the power supply circuit in accordance with the feedback signal; and a charger controller interfaced with the power supply controller and the amplifier to implement a charging method having a stepped output current, where charger controller sets level of the output current by adjusting gain of the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 17, 18, 19)
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11. A battery charger
a power supply circuit receiving an AC input signal and operable to output a DC output signal, the power supply circuit having a transformer and a power switch coupled to a primary winding of the transformer to control the current flow through the transformer; -
a power supply controller configured to receive a feedback signal indicative of current being output by the power supply circuit via an operational amplifier having a negative feedback configuration, the power supply controller coupled to the power switch and operable to control the power switch in accordance with the feedback signal; and a charger controller interfaced with the power supply controller to implement a charging method having a stepped output current, where charger controller sets level of the output current by changing resistance at an inverting input terminal of the operational amplifier.
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- 13. The battery charger of claim 13 further comprises two or more resistors arranged in parallel with each other and each of said resistors connected between the inverting input terminal of the operational amplifier and the charger controller.
Specification