System and method for load current measurement in multiport power adapters
The present disclosure provides a system and method including: a first USB port and one or more second USB ports provided on the multi-port adapter; an AC-DC conversion configured to measure a first load current at the first USB port; a plurality of buck-boost mode power conversion units, each configured to measure a second load current at a corresponding one or more second USB ports; and a system controller configured to measure the first load current and the one or more second load currents, wherein the system controller is configured to compare and adjust the measured first load current and the measured one or more second load currents to, respectively, a first rated current and a corresponding second rated current for each of the one or more second USB ports.
1. A system for measuring load currents in a multi-port power adapter, the system comprising:
a first USB port and one or more second USB ports provided on the multi-port adapter;
an AC-DC conversion unit electrically connected to the first USB port and configured to measure a first load current at the first USB port;
a plurality of buck-boost mode power conversion units, each of the plurality of buck-boost mode power conversion units electrically connected to a second USB port of the one or more second USB ports, and each configured to measure one or more second load currents at the corresponding one or more second USB ports; and
a system controller configured to measure the first load current through the AC-DC conversion unit and one or more second load currents through the corresponding buck-boost mode power conversion units;
wherein the system controller is configured to measure the first load current by means of a low side current sense method, and the one or more second load currents by means of a high side current sense method, and
wherein the system controller is further configured to compare and adjust the measured first load current and the measured one or more second load currents to, respectively, a first rated current and corresponding one or more second rated currents for each of the one or more second USB ports.
2. The system as claimed in claim 1 , wherein the system interacts with the AC-DC conversion unit and the buck-boost mode power conversion unit through use of analogue feedback control signals and through a digital interface selected from one or more of Inter-Integrated Circuit (I2C), General Purpose Input-Out (GPIO), and other inter chip communication methods.
3. The system as claimed in claim 1 , wherein each of the first USB port and the one or more second USB ports are a type-A port or type-C port.
4. The system as claimed in claim 3 , wherein the AC-DC conversion unit and the buck-boost mode power conversion units have an electrical correspondence with each other through a VOUT line.
5. The system as claimed in claim 4 , wherein the multiport adapter is configured to support one or more of common and individual ground-based sink devices.
6. A method for measuring load currents in a multiport power adapter, the method comprising the steps of:
measuring, with a system controller, a first load current and one or more second load currents associated with a first USB port and one or more second USB ports, said first USB port and said one or more second USB ports are provided on the multiport power adapter, wherein the system controller is configured to measure the first load current by means of a low side current sense method, and the one or more second load currents by means of a high side current sense method; and
comparing, with the system controller, the measured first load current and the measured one or more second load currents against, respectively, a first rated current and a corresponding one or more second rated currents for each of the one or more second USB ports,
wherein the system controller is configured to adjust the measured first load current and the measured one or more second load currents to the first rated current and the corresponding one or more second rated currents respectively.
7. The method as claimed in claim 6 , wherein the first load current is associated with an AC-DC conversion unit, and each of the one or more second load currents is associated with a corresponding buck-boost mode power conversion unit.
8. The method as claimed in claim 6 , wherein the system controller interacts with the AC-DC conversion unit and the buck-boost mode power conversion unit through use of analogue feedback control signals and through a digital interface selected from one or more of Inter-Integrated Circuit (I2C), General Purpose Input-Out (GPIO), and other inter chip communication methods.
9. The method as claimed in claim 6 , wherein each of the first USB port and the one or more second USB ports are a type-A port or a type-C port.
10. The method as claimed in claim 9 , wherein the AC-DC conversion unit and the buck-boost mode power conversion units have an electrical correspondence with each other through a VOUT line.