CHARGER CIRCUIT
First Claim
1. A charger circuit structured to charge a secondary battery having a multi-cell structure, the charger circuit comprising:
- a step-down charger structured to receive a bus voltage, which is supplied from a USB (Universal Serial Bus) host adapter to a USB port, and to charge the secondary battery;
a step-up charger structured to receive the bus voltage, and to charge the secondary battery;
a PD controller structured to detect whether or not a host adapter that conforms to a PD (Power Delivery) specification has been coupled to the USB port, and to determine the bus voltage and a charging current based on negotiation with the host adapter; and
a charger detector structured to detect whether or not a host adapter that conforms to a BC (Battery Charging) specification has been coupled to the USB port, and to judge a kind of the host adapter based on an electrical state of the USB port,wherein the charger circuit is structured to be switchable between a step-up charger and a step-down charger, based on a specification to which the host adapter conforms and a profile supported by the host adapter.
1 Assignment
0 Petitions
Accused Products
Abstract
A charger circuit charges a secondary battery having a multi-cell structure. A step-down charger and a step-up charger receive a bus voltage VBUS, and charge the secondary battery. A PD controller detects whether or not a host adapter that conforms to the PD (Power Delivery) specification has been coupled to a USB port, and determines the bus voltage VBUS and a charging current based on negotiation with the host adapter. A charger detector detects whether or not a host adapter that conforms to the BC (Battery Charging) specification has been coupled to the USB port, and judges the kind of the host adapter based on the electrical state of the USB port. The charger circuit switches the charger to be used, between the step-up charger and the step-down charger, based on the specification to which the host adapter conforms and a profile supported by the host adapter.
36 Citations
9 Claims
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1. A charger circuit structured to charge a secondary battery having a multi-cell structure, the charger circuit comprising:
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a step-down charger structured to receive a bus voltage, which is supplied from a USB (Universal Serial Bus) host adapter to a USB port, and to charge the secondary battery; a step-up charger structured to receive the bus voltage, and to charge the secondary battery; a PD controller structured to detect whether or not a host adapter that conforms to a PD (Power Delivery) specification has been coupled to the USB port, and to determine the bus voltage and a charging current based on negotiation with the host adapter; and a charger detector structured to detect whether or not a host adapter that conforms to a BC (Battery Charging) specification has been coupled to the USB port, and to judge a kind of the host adapter based on an electrical state of the USB port, wherein the charger circuit is structured to be switchable between a step-up charger and a step-down charger, based on a specification to which the host adapter conforms and a profile supported by the host adapter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification