Method for driving an inverter device

Abstract

The invention discloses a PWM inverter device, which avoids applying a surge voltage between terminals of a switching element by preventing multiphase synchronous switching. A synchronous switching prThe invention discloses a PWM inverter device, which avoids applying a surge voltage between terminals of a switching element by preventing multiphase synchronous switching. A synchronous switching prevention circuit comprises: a plurality of input devices, shielding pulse generation devices, shielding signal forming devices, signal shielding devices, a plurality of output devices, wherein the pluevention circuit comprises: a plurality of input devices, shielding pulse generation devices, shielding signal forming devices, signal shielding devices, a plurality of output devices, wherein the plurality of input devices read multiphase control signals which serve as input signals and are output by a PWM signal generation circuit; the shielding pulse generation devices and the shielding signalrality of input devices read multiphase control signals which serve as input signals and are output by a PWM signal generation circuit; the shielding pulse generation devices and the shielding signalforming devices are used for generating shielding pulses capable of shielding rise in other input signals in self preset periods according to the rise in the input signals of the shielding pulse generforming devices are used for generating shielding pulses capable of shielding rise in other input signals in self preset periods according to the rise in the input signals of the shielding pulse generation devices; the signal shielding devices are used for outputting shielding signals for shielding signals which shield the logic of a plurality of shielding pulses generated by shielding pulse generation devices; the signal shielding devices are used for outputting shielding signals for shielding signals which shield the logic of a plurality of shielding pulses generated by shielding pulse generating devices in other phases and use the pulse width of the generated pulses as a shielding period, receiving input signals from a former phase and outputting signals which allow the rise and drop ofating devices in other phases and use the pulse width of the generated pulses as a shielding period, receiving input signals from a former phase and outputting signals which allow the rise and drop ofthe input signals to delay to the end of the shielding period; and the plurality of output devices are used for outputting output signals from the signal shielding devices to the outside. The synchro the input signals to delay to the end of the shielding period; and the plurality of output devices are used for outputting output signals from the signal shielding devices to the outside. The synchronous switching prevention circuit (100) is inserted between a grid driving circuit (2) and a three-phase PWM signal generation circuit(1).nous switching prevention circuit (100) is inserted between a grid driving circuit (2) and a three-phase PWM signal generation circuit(1).

Description

[0001] This application is a divisional application of: [0002] Invention name: Multi-phase simultaneous switching prevention circuit, PWM inverter device and its driving method [0003] Application date: February 19, 2004 [0004] Application number: 200480015041.2 (PCT / JP2004 / 001863) technical field [0005] The invention relates to an inverter device for converting direct current into alternating current according to a pulse width modulation (PWM) signal, in particular to an inverter device with a circuit and a function for preventing multi-phase switching at the same time. Background technique [0006] Hereinafter, a configuration example of a conventional three-phase PWM inverter device will be described with reference to the drawings. [0007] Figure 20 Inside the dotted line is a circuit block diagram of the structure of a 3-phase PWM inverter device for driving and controlling a conventional 3-phase AC motor (for example, refer to pages 2-3 and Figure 4 of Japane...

AI Technical Summary

Problems solved by technology

In this case, 2-phase IGBTs with the same high side switch simultaneously, causing a drastic current change, and as a result, a high surge voltage is applied between the IGBT terminals

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