Patent ID: 9614446
Date: 2017-04-04
CPC Classifications: H02J,H02M

Claim:
1. A power supply device for adapting mains input power to supply power for a portable device connected to the power supply device, wherein the portable device comprises one type of different types of portable devices, the power supply device comprising: an input circuit for receiving the mains input power and providing input supply power; a power switch device coupled to the input supply power; a power inductance coupled to the power switch device; an output circuit coupled to the power inductance to provide the supply power for the portable device; a controller for controlling the power switch device according to a supply power requirement of the portable device; and a measurement inductance magnetically coupled to the power inductance, wherein the controller comprises a measurement input coupled to the measurement inductance for detecting a measurement signal indicative of a magnetic state of the power inductance, and wherein the controller is arranged for detecting the supply power requirement of the portable device based on the magnetic state in response to said controlling the power switch device, and wherein the portable device being one type of different types of portable devices includes a power supply input to be connected to the output circuit of the power supply device, which power supply input of the portable device is provided with a resistive element of a specific, different resistor value of one of the different portable device types, in parallel with the power supply input of the portable device, such that, when a type-measurement voltage is provided at the power supply input of the portable device, which type-measurement voltage is below an operational voltage required for an electronic circuit of the portable device to be operational, a type-measurement current is drawn from the power supply device to distinguish between the different portable device types and which is indicative of the supply power requirement of the portable device type, and wherein the controller is further arranged for generating the type-measurement voltage at a supply power output of the output circuit, and detecting the type-measurement current drawn by the portable device for distinguishing between the different portable device types and determining the supply power requirement of the portable device type.