BOOTSTRAP DRIVING CIRCUIT WITHOUT EXTRA POWER SUPPLY

摘要

The present invention provides a bootstrap driving circuit without extra power supply, which circuit includes a power unit, a switching unit, a bootstrap unit, a drive unit; the power unit is used to output a direct voltage; the switching unit is connected with the power unit, to control the turn-on or turn-off with the power unit; the bootstrap unit is connected with the switching unit, to supply drive electric energy and output drive power; the bootstrap unit includes an energy storage capacitor; the drive unit is connected with the bootstrap unit, to output control signal under the drive of the drive power. The bootstrap driving process is completed via the charging-discharging of the energy storage capacitor in the bootstrap unit of the invention and without an extra power supply, which forms the bootstrap driving circuit without extra power supply, further overcomes the requirement of an extra power supply for a common driving circuit, reduces the power consumption and meets the demand of the circuit. The invention is suitable for the application of a three-phase AC-DC converter to be drive controlled.

主权项

1. A bootstrap driving circuit without extra power supply, characterized in that, the bootstrap driving circuit without extra power supply comprising:
a power unit being used to output a direct voltage; a switching unit being connected with the power unit, to control the turn-on or turn-off with the power unit; a bootstrap unit being 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 being connected with the bootstrap unit, to output control signal under the drive of the drive power.