Patent ID: 8339101

Claim:
A portable computer system, comprising: a host, comprising an operating circuit; a power storage device, installed in the host, comprising: a first power terminal, coupled to the operating circuit; a first power socket, for being inserted a transformer; a first current sensing circuit, coupled between the first power socket and the first power terminal, for sensing current from the first power socket to the first power terminal, to generate a first sensing result; a first rechargeable battery; a first switch, coupled between the first rechargeable battery and the first power terminal, for switching connection between the first rechargeable battery and the first power terminal according to a power capacity of the first rechargeable battery; and a first charging circuit, coupled to the first power terminal and the first rechargeable battery, for charging the first rechargeable battery according to a first control signal; and a dock, capable of connecting to the host by means of insertion, comprising: a second power terminal, coupled to the operating circuit; a second power socket, for being inserted the transformer; a second current sensing circuit, coupled between the second power socket and the second power terminal, for sensing current from the second socket to the second power terminal, to generate a second sensing result; a second rechargeable battery; a second switch, coupled between the second rechargeable battery and the second power terminal, for switching connection between the second rechargeable battery and the second power terminal according to a power capacity of the second rechargeable battery; a second charging circuit, coupled to the second power terminal and the second rechargeable battery, for charging the second rechargeable battery according to a second control signal; and a control device, coupled to the first current sensing circuit, the first charging circuit, the second current sensing circuit and the second charging circuit, for outputting the first control signal and the second control signal according to the first sensing result and the second sensing result, to control the first charging circuit and the second charging circuit; wherein the control device is utilized for controlling the second charging circuit to decrease power supply for the second rechargeable battery when the first sensing result indicates that the current from the first power socket to the first power terminal is greater than a default value.