Non-linear load driving circuit and controller

A controller, for controlling a conversion circuit to drive a non-linear load, the controller comprising:

• a feedback unit, for generating a feedback signal according to a current feedback signal, wherein the current feedback signal represents a load current flowing through the non-linear load;
• a pulse width control unit, for generating a control signal according to the feedback signal to control a power output of the conversion circuit;
• and
• an overshoot reduction unit, for generating an overshoot reduction signal according to a voltage feedback signal, wherein the voltage feedback signal represents a load voltage applied to the non-linear load;
• wherein the pulse width control unit receives the overshoot reduction signal and reduces a duty cycle of the control signal according to the overshoot reduction signal.

A non-linear load driving circuit, for driving a non-linear load, the non-linear load driving circuit comprising:

• a conversion circuit, for coupling an input voltage source and the non-linear load and converting a power received from the input voltage source to drive the non-linear load at a predetermined output current;
• and
• a controller, for generating at least one control signal according to a current feedback signal to control the conversion circuit to convert the power, wherein the current feedback signal represents a load current flowing through the non-linear load;
• wherein the controller reduces a duty cycle of the control signal when the load current flowing through the non-linear load changes from being smaller than a predetermined current to being greater than the predetermined current or a load voltage applied to the non-linear load changes from being smaller than a predetermined voltage to being greater than the predetermined voltage, and the predetermined current is smaller than the predetermined output current.