US 6,147,887 A · Inverter utilizing a bootstrap method

Abstract

An inverter has a direct voltage intermediate circuit having a positive (Udc+) and a negative (Udc-) voltage busbar, and an auxiliary voltage source (1) which generates auxiliary voltages (U1, U2, U3) referenced to the positive (Udc+) and the negative (Udc-) voltage busbar of the direct voltage intermediate circuit. The inverter also has for each phase an upper (2) and a lower (3) power semiconductor, connected in series between the positive and the negative voltage busbar. The point between the semiconductors forms the phase output (Uout) of the inverter. An upper (4) and lower (5) gate driver outputs (8,9) are connected to the control electrode (G) of the respective upper (2) and lower (3) power semiconductors which have a positive (6) and a negative (7) auxiliary voltage input and a zero potential point (Com) connected to the output electrode (E) of the power semiconductor to be controlled. A first diode (D1) has its anode connected to the positive auxiliary voltage (U2) and its cathode connected to the positive auxiliary voltage input (6) of the upper gate driver (4). A first capacitor (C1) is connected between the positive auxiliary voltage input (6) of the upper gate driver (4) and the zero potential point (Com). The inverter also has for each phase another diode (D2), its anode being connected to the negative auxiliary voltage input (7) of the upper gate driver and its cathode being connected to the negative auxiliary voltage (U3). Another capacitor (C2) is connected between the negative auxiliary voltage input (7) and the zero potential point.

Claims2

Dependent claims

An inverter which comprises

a direct voltage intermediate circuit consisting of a positive and a negative voltage busbar, and
an auxiliary voltage source which generates auxiliary voltages referenced to the positive and the negative voltage busbar of the direct voltage intermediate circuit,
the inverter also comprising for each phase
an upper and a lower power semiconductor, which are connected in series between the positive and the negative voltage busbar, the point between the semiconductors forming the phase output of the inverter,
an upper and a lower gate driver the outputs of which are connected to the control electrode of the respective upper and lower power semiconductors and which comprise a positive and a negative auxiliary voltage input and a zero potential point, which is connected to the output electrode of the power semiconductor to be controlled,
a first diode the anode of which is connected to the positive auxiliary voltage referenced to the negative voltage busbar and the cathode to the positive auxiliary voltage input of the upper gate driver,
and a first capacitor which is connected between the positive auxiliary voltage input of the upper gate driver and the zero potential point (Com), wherein
the inverter also comprises for each phase
another diode the anode of the which is connected to the negative auxiliary voltage input of the upper gate driver and the cathode to the negative auxiliary voltage referenced to the positive busbar, and
another capacitor which is connected between the negative auxiliary voltage input and the zero potential point of the upper gate driver.

7 more elements

Dependencies are inferred from the claim text.

Inverter utilizing a bootstrap method

Life of this patent

Inverter utilizing a bootstrap method

Life of this patent

Abstract

Claims2