Patent ID: 9479041
Filing Date: 2016-10-25
CPC Classification: H02M,H03K

Claim Text:
1. A bootstrap driving circuit without an extra power supply, characterized in that, the bootstrap driving circuit without extra power supply comprising: a power unit used to output a direct voltage; a switching unit connected with the power unit, to control the turn-on or turn-off with the power unit; a bootstrap unit connected with the switching unit, to supply drive electric energy and output drive power; the bootstrap unit comprises an energy storage capacitor; a drive unit connected with the bootstrap unit, to output control signal under the drive of the drive power; the drive unit comprises a photoelectric coupler, the photoelectric coupler comprises a power side of a power device and a control side of a control device, the power side of the power device receives the drive of the drive power, the control side of the control device outputs the control signal; the switching unit comprises a second bridge rectifier circuit and a power device; the second bridge rectifier circuit is connected in parallel with the power device; the gate pole of the power device is connected with the power side of the power device of the drive unit, to receive the drive power.