Patent ID: 8686761
Filing Date: 2014-04-01
Classification: H02M,H03K

Abstract:
1. A gate driver for driving a gate of a switching element, comprising: a first capacitor having a first end connected through a startup resistor to a positive electrode of a DC power source; a first switch having a first electrode, a second electrode, and a first control electrode, the first electrode being connected to the first end of the first capacitor; a second switch having a third electrode, a fourth electrode, and a second control electrode, the third electrode being connected to the second electrode of the first switch and a negative electrode of the DC power source as a ground level, and the fourth electrode being connected to a second end of the first capacitor; a second capacitor connected in parallel with the third and fourth electrodes of the second switch and having a first end connected to the second end of the first capacitor and a second end connected to the negative electrode of the DC power source; and a negative voltage controller configured to connect the gate of the switching element to the second end of the first capacitor and the first end of the second capacitor according to a pulse signal when the switching element is turned off, and thereby the gate of the switching element has a negative voltage.