Power management device and method

A power management device adapted to be disposed in a consumer product, the power management device comprising:

• a memory, adapted to store at least one protocol profile;
• a configuration channel interface circuit, adapted to be coupled to a configuration channel pin of a connector of the consumer product;
• a control circuit, coupled to the configuration channel interface circuit and the memory, and
• a data channel interface circuit, adapted to be coupled to a differential signal pin pair of the connector, wherein the control circuit is further coupled to the data channel interface circuit, wherein
• when a power supply device is electrically connected to the connector of the consumer product, the control circuit performs a power delivery protocol conforming to a USB specification on the power supply device through the configuration channel interface circuit and the configuration channel pin, so as to determine a power mode in which the power supply device supplies power to the consumer product;
• after the power delivery protocol is performed successfully, based on the at least one protocol profile stored in the memory, the control circuit performs a vendor-defined messaging protocol on the power supply device through the configuration channel interface circuit and the configuration channel pin, so as to determine whether to change the power mode between the power supply device and the consumer product;
• when the power supply device is electrically connected to the connector of the consumer product, if the power delivery protocol is performed unsuccessfully or the configuration channel pin is not electrically connected to the power supply device, the control circuit detects an electrical state of the differential signal pin pair through the data channel interface circuit, and turns on a power switch of the consumer product according to the electrical state, so as to transmit a power provided by the power supply device to a main power bus of the consumer product through the connector and the power switch;
• and
• after the power switch is turned on, the control circuit performs a first power source protocol in a bidirectional manner on the power supply device through the data channel interface circuit and the differential signal pin pair, so as to determine whether to change the power mode in which the power supply device supplies power to the consumer product.