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US 10,541,550 B2Granted
Switching power converter for direct battery charging
AssigneeDialog Semiconductor GmbH
InventorsFuqiang Shi, Jianming Yao, Yong Li, Kai-wen Chin, Cong Zheng
Life of this patent
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Abstract
A direct charging method is provided that alerts a mobile device when a switching power converter is operating in a constant-current mode to alert the mobile device of an output current without the use of a secondary-side current sense resistor.
Claims14
A method of directly charging a battery for a mobile device using a flyback converter that does not include a sense resistor in series with a secondary winding of a transformer, comprising:
- receiving at a secondary controller for the flyback converter over a data channel in a data interface cable, a desired output voltage command for setting a first output voltage limit and a desired output current command for setting a first output current limit;
- transmitting the desired output voltage command and the desired output current command from the secondary controller to a primary controller for the flyback converter;
- in the secondary controller, determining that the primary controller is regulating the cycling of the power switch according to a constant-current mode responsive to a determination by the secondary controller that the output voltage is less than the difference of the first output voltage limit and a voltage margin;
- and
- alerting the mobile device of the determination that the primary controller is in the constant-current mode.
2 more elements
A flyback converter, comprising:
- a primary controller configured to cycle a power switch in a constant-voltage mode responsive to an output current being less than a first output current limit and to cycle the power switch in a constant-current mode responsive to the output current equaling the first output current limit;
- and
- a secondary, controller configured to receive a first output voltage limit and the first output current limit from a mobile device over a data channel in a data interface cable and to transmit the first output voltage limit and the first output current limit to the primary controller, wherein the secondary controller is further configured to transmit a constant-current flag signal to the mobile device responsive to the output voltage being less than a difference of the first output voltage limit and a voltage margin.
Dependencies are inferred from the claim text.