Current adjusting device and adjustment method thereof

Abstract

A current adjusting device is disclosed herein. The current adjusting device is utilized for adjusting a value of a current outputted into a load. The current adjusting device comprises a constant current driving unit and a boosting circuit. The constant current driving unit is electrically connected with a negative terminal of the load and a first resistor respectively, and the constant current driving unit comprises a comparing module and a first switch module, such that the constant current driving unit detects a voltage of the negative terminal of the load and outputs a boost signal. The constant current driving unit receives a PWM signal to control a close or an open of the first switch module for controlling a waveform of a load current, and the constant current driving unit receives an input voltage having an adjustable duty cycle to form a reference voltage and adjusts an impedance of the first switch module by comparing the reference voltage and a voltage on the first resistor by the comparing module to determine the current value of the load. The boost circuit, which is electrically connected with a positive terminal of the load and an external power source, boosts an external voltage provided by the external power source to drive the load according to the boost signal.

Dependencies are inferred from the claim text.