Power supplying apparatus and method for supplying power to the varying load

摘要

Disclosed is an apparatus for supplying power to a device. The apparatus includes a transformer configured to output a predetermined voltage to a device varying in load; a switch configured to switch on and off the voltage output from the transformer in accordance with pulse width modulation (PWM) signals; a PWM signal supplier configured to supply the PWM signal to the switch; a feedback circuit which detects the output from the transformer and applies a control signal to the PWM signal supplier; and an output voltage controller which detects a load current of the device, and adjusts the control signal of the feedback circuit by adjusting the output detected by the feedback circuit in accordance with the detected load current.

主权项

1. An apparatus for supplying power, the apparatus comprising:
a transformer configured to output a predetermined voltage to a device varying in load; a switch configured to switch on and off the transformer in accordance with a first pulse width modulation (PWM) signals; a first PWM signal supplier configured to supply the first PWM signal to the switch; a feedback circuit configured to detect an output from the transformer and apply a control signal to the first PWM signal supplier; and an output voltage controller configured to detect a load current of the device, and adjust the control signal of the feedback circuit by adjusting the output detected by the feedback circuit in accordance with the detected load current, wherein the output voltage controller comprises: a shunt resistor configured to detect the load current; a current detector configured to detect a current flowing in the shunt resistor in order to detect the load current and output a predetermined voltage in accordance with the detected current; a second PWM signal generator configured to generate the second PWM signal in accordance with the predetermined voltage; and an output voltage adjuster configured to adjust the output detected by the feedback circuit in accordance with the second PWM signal output from the second PWM signal generator.