BATTERY CHARGER USING PHASE SHIFT DOUBLE FORWARD CONVERTING CIRCUIT
First Claim
1. A method of dynamically adjusting an output voltage for battery charging operation, comprising:
- setting a phase shift between duty cycles of a pair of forward converter circuits based on a detected battery voltage rating of a battery; and
adjusting the duty cycles of the pair of forward converter circuits to accommodate changes in a voltage requirement of the battery.
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Abstract
A technique for dynamically adjusting an output voltage of forward converter circuits for a battery charging operation is provided. The technique allows for varying voltage at the charging battery by manipulating the duty cycles of two forward converter circuits. The present disclosure provides methods and systems for increasing synchronized duty cycles in a pair of forward converter circuits in response to a changing battery charge state that requires a higher voltage output then changing a phase shift between the duty cycles in response to further increases in output voltage demand. The present disclosure also provides methods and systems for setting a phase shift between duty cycles in a pair of forward converter circuits based on battery rating and then altering pulse width in response to changing battery charge state. The invention provides a controller designed to receive input signals and generate output pulse width modulation signals that control the duty cycle width and phase shift of the outputs of the forward converter circuits in response to these signals. Methods of accommodating for the time needed for the transformer core to reset via leading edge or lagging edge compensation are provided.
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Citations
20 Claims
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1. A method of dynamically adjusting an output voltage for battery charging operation, comprising:
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setting a phase shift between duty cycles of a pair of forward converter circuits based on a detected battery voltage rating of a battery; and adjusting the duty cycles of the pair of forward converter circuits to accommodate changes in a voltage requirement of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A battery charging system, comprising:
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a pair of forward converter circuits capable of coordinating to accommodate a dynamic voltage requirement of a battery; and a controller, comprising; a regulator capable of receiving at least one input related to a desired combined voltage output for the pair of forward converter circuits based on the dynamic voltage requirement of the battery, and capable of generating a control signal; and a processor capable of receiving the control signal and driving switches in the pair of forward converter circuits to facilitate control of duty cycles of the pair of forward converter circuits based on the control signal to produce the desired combined voltage output. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of accommodating a voltage requirement of a battery charging operation, comprising:
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increasing synchronized duty cycles in a pair of forward converter circuits to accommodate an increase in a battery charge state of the battery; and changing a phase shift between the duty cycles upon reaching an upper limit for each of the duty cycles to accommodate a further increase in the battery charge state. - View Dependent Claims (17, 18, 19, 20)
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Specification