Patent ID: 8368359
Filing Date: 2013-02-05
Classification: H02J

Abstract:
1. A power management unit (PMU) for supplying electrical energy to a circuitry of a portable electronic device, comprising: a power supply module including a battery, a charge controller, and an adapter; a power detection module connected to the power supply module, the power detection including a detection resistor connected to the battery, the charge controller, and the adapter; and a power control module connected to the power detection module and the circuitry; wherein the battery provides electrical energy to the circuitry through the power detection module and the power control module, or the adapter is connected to a power supply to regulate the voltage of electrical energy provided by the power supply to a predetermined value and provide the electrical energy having the predetermined voltage to the circuitry through the power detection module and the power control module; the adapter further providing electrical energy of other supplies connected thereto to the battery through the detection resistor to charge the battery when it is used to provide electrical energy to the circuitry, the charge controller detecting the current for charging the battery via the detection resistor, and regulating the current for charging the battery when the charging current exceeds a predetermined value; and wherein the power detection module includes a processor connected to the detection resistor, the battery, and the power control module; the processor detects the current passing through the detection resistor and a voltage provided to the circuitry, calculates the power of the electrical energy provided to the circuitry according to the current passing through the detection resistor and the voltage provided to the circuitry; and controls the power control module to limit the power of the electrical energy provided to the circuitry when the power of the electrical energy provided to the circuitry exceeds a predetermined value.