Patent ID: 9294007
Filing Date: 2016-03-22
CPC Classification: H02M,H03K

Claim Text:
1. A gate driving circuit, comprising: at least one gate driving unit including at least one high voltage gate driving unit having a plurality of high voltage gate drivers connected to one another in series between an input terminal of an instruction signal instructing a switching control of an inverter unit including at least one inverter arm having a plurality of switches and switching input power according to a control to output alternating current (AC) power and an output terminal of a control signal controlling switching of the inverter unit to thereby control gate driving of a high side switch of the plurality of switches, and including at least one low voltage gate driver to control the gate driving of a low side switch of the plurality of switches; and at least one bootstrap unit dividing a voltage generated at the time of switching the plurality of switches to apply the divided voltage to respective switches according to switching control of the gate driving unit, wherein the inverter arm includes the high side switch, first and second middle side switches, and the low side switch sequentially connected in series between the input power terminal and a ground, wherein the gate driving unit includes: a first high voltage gate driving unit having the plurality of high voltage gate drivers connected to one another in series between the input terminal of the instruction signal and the output terminal of the control signal, and controlling switching of the high side switch; a second high voltage gate driving unit having the plurality of high voltage gate drivers connected to one another in series between the input terminal of the instruction signal and the output terminal of the control signal, and controlling switching of the first middle side switch; a high voltage gate driver controlling switching of the second middle side switch; and a low voltage gate driver controlling switching of the low side switch, wherein the bootstrap unit includes: a capacitor group including a first capacitor connected between a driving power terminal of a high voltage gate driver of the last stage of the first high voltage gate driving unit and the ground, a second capacitor connected between a driving power terminal of the high voltage gate driver of the last stage of the second high voltage gate driving unit and the ground, and a third capacitor connected between a driving power terminal of a high voltage gate driver controlling switching of the second middle side switch and the ground and connected to a driving power input terminal inputting the driving power to the high voltage gate driver of the last stage of the first high voltage gate driving unit and a driving power input terminal inputting the driving power to the high voltage gate driver of the last stage of the second high voltage gate driving unit; and a diode group including a first diode connected between the driving power terminal of the high voltage gate driver of the last stage of the first high voltage gate driving unit and the driving power terminal of the high voltage driver of the last stage of the second high voltage gate driving unit, a second diode connected between the driving power terminal of the high voltage gate driver of the last stage of the second high voltage gate driving unit and the driving power terminal of the high voltage gate driver controlling the switching of the second middle side switch, and a third diode connected between the driving power terminal of the high voltage gate driver controlling the switching of the second middle side switch and a driving power terminal of the low voltage gate driver.