Alternating current/direct current adaptor and self-adaptive voltage output method

摘要

An alternating current (AC)/direct current (DC) adaptor is to be coupled electrically with an electronic device having an electrical property, and includes a DC/DC converter that receives a DC voltage signal and a control signal, and that adjusts the DC voltage signal according to the control signal to obtain an output DC voltage signal. A device discriminator receives the output DC voltage signal, and generates, according to the output DC voltage signal and the electrical property, a device indication signal set. A controller obtains a target value according to the device indication signal set, and outputs the control signal according to an initial value or the target value to control voltage value of the output DC voltage signal provided to the electronic device.

主权项

1. An alternating current (AC)/direct current (DC) adaptor to be coupled electrically with an AC power source which provides an AC voltage signal, and with an electronic device which has an electrical power interconnection property, the electronic device having a first device terminal and a second device terminal, the electrical power interconnection property of the electronic device being a rated load, said AC/DC adaptor comprising:
a DC power supply output connector to be coupled electrically to the electronic device; an AC/DC converter to be coupled electrically to the AC power source for receiving the AC voltage signal therefrom and for performing AC/DC conversion upon the AC voltage signal to obtain a DC voltage signal; a DC/DC converter that is coupled electrically to said AC/DC converter for receiving the DC voltage signal therefrom, that receives at least one control signal, and that adjusts a level of the DC voltage signal according to the at least one control signal so as to obtain an output DC voltage signal; a device discriminator coupled electrically to said DC/DC converter for receiving the output DC voltage signal therefrom, and coupled electrically to said DC power supply output connector, said device discriminator being configured to provide the output DC voltage signal to said DC power supply output connector, and to generate, according to both (1 )the output DC voltage signal and (2 ) the electrical power interconnection property of the electronic device coupled with said DC power supply output connector: a device indication signal set associated with a device specification of the electronic device; and a controller coupled electrically to said DC/DC converter for providing the at least one control signal thereto, said controller being coupled electrically to said device discriminator for receiving the device indication signal set, and storing a discrimination table and an initial value of the at least one control signal, said discrimination table recording a plurality of set values of the at least one control signal and a plurality of values of the device indication signal set, each of the set values of the at least one control signal corresponding to one of the values of the device indication signal set and further corresponding to an electronic device with a specified device specification, wherein prior to receipt of the device indication signal set by said controller, said controller outputs the at least one control signal according to the initial value such that said DC/DC converter adjusts the DC voltage signal according to the initial value of the at least one control signal, so as to obtain the output DC voltage signal that has a predetermined output voltage value and that is provided to said DC power supply output connector, and said device discriminator generates, according to the output DC voltage signal and the electrical power interconnection property of the electronic device coupled with said DC power supply output connector, the device indication signal set; and upon receipt of the device indication signal set by said controller, said controller identifies a target value in said discrimination table according to the device indication signal set so as to obtain the corresponding one of the set values of the at least one control signal as the target value, and outputs the at least one control signal according to the target value such that said DC/DC converter adjusts the DC voltage signal according to the target value, so as to obtain the output DC voltage signal which conforms with the device specification of the electronic device coupled to said DC power supply output connector, and which is outputted to said DC power supply output connector for transmission to the electronic device; and wherein the device indication signal set includes a first signal and a second signal, said DC power supply output connector having a first connector terminal and a second connector terminal to be coupled electrically and respectively to the first device terminal and the second device terminal of the electronic device, said device discriminator generating the device indication signal set based on an output current signal which flows from said first connector terminal, via the first device terminal and the second device terminal of the electronic device, to said second connector terminal and which corresponds to the predetermined output voltage value and the rated load of the electronic device, said device discriminator including: a resistor having a grounded first end, and a second end coupled electrically to said second connector terminal, a discrimination voltage signal being formed across said resistor according to magnitude of the output current signal and resistance of said resistor: a first comparator having a non-inverting input coupled electrically to said second connector terminal for receiving the discrimination voltage signal therefrom, an inverting input for receiving a first reference voltage, and an output for providing the first signal; and a second comparator having a non-inverting input coupled electrically to said second connector terminal for receiving the discrimination voltage signal therefrom, an inverting input for receiving a second reference voltage, and an output for providing the second signal; wherein the second reference voltage is greater than the first reference voltage.