Driving circuit, converter and driving method

A converter, comprising:

• a nitride-based transistor;
• and
• a driving circuit, wherein the driving circuit comprises:
• a main output terminal electrically coupled with a gate electrode of the nitride-based transistor;
• a first voltage generating circuit electrically coupled with the main output terminal, wherein the first voltage generating circuit is configured to generate a first voltage at the main output terminal during a predetermined time interval of a turn-on duration of a switching period;
• and
• a second voltage generating circuit electrically coupled with the main output terminal, wherein the second voltage generating circuit is configured to generate a second voltage at the main output terminal for turning on the nitride-based transistor during a remaining time interval of the turn-on duration of the switching period;
• wherein the predetermined time interval is ahead of the remaining time interval, and the second voltage is lower than the first voltage;
• and
• wherein the first voltage generating circuit comprises a first comparator, and the first comparator has a positive input terminal, a negative input terminal and an output terminal, the voltage divider circuit is electrically coupled with the positive input terminal of the first comparator, the first voltage generating circuit further comprises a first reference voltage source, and the first reference voltage source is coupled in series with a first diode at the negative input terminal of the first comparator.

A method for driving a nitride-based transistor, comprising:

• providing a driving circuit comprising a first voltage generating circuit and a second voltage generating circuit;
• and
• turning on the nitride-based transistor by providing a first voltage and a second voltage to the nitride-based transistor in sequence, wherein the first voltage is generated by the first voltage generating circuit during a predetermined time interval, the second voltage is generated by the second voltage generating circuit during a remaining time interval which is after the predetermined time interval;
• wherein the second voltage is lower than the first voltage but higher than a threshold voltage of the nitride-based transistor;
• and
• wherein the first voltage generating circuit comprises a first comparator, and the first comparator has a positive input terminal, a negative input terminal and an output terminal, the voltage divider circuit is electrically coupled with the positive input terminal of the first comparator, the first voltage generating circuit further comprises a first reference voltage source, and the first reference voltage source is coupled in series with a first diode at the negative input terminal of the first comparator.