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Low-loss-and-anti-shoot-through-pulse-width-modulated-inverter-controller

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Low loss and anti-shoot-through pulse width modulated inverter controller

Details

Inventors: Asano, Katsuhiro; Inagawa, Yukio;
Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Aichi, JP)
Primary Examiner: Salce; Patrick R.
Assistant Examiner: Sterrett; Jeffrey
Attorney, Agent or Firm: Parkhurst & Oliff

An inverter controller for controlling an inverter having a plurality of electric valves each formed by connecting a switching element and a diode in anti-parallel with each other. On the basis of an output current command value, an ON/OFF signal is supplied to a switching element which needs to operate, and the supply of an ON signal to a switching element which need not operate is inhibited. Thus, it becomes unnecessary to provide dead time which has heretofore been needed.

DETAILED DESCRIPTION In view of the above-described circumstances, it is an object of the present invention to provide an inverter controller in which the supply of the ON signal to a switching element which need not operate is compulsorily inhibited by an inhibiting circuit on the basis of an output current command value, thereby eliminating the need to provide any dead time.
It is another object of the present invention to provide an inverter controller so designed that it is possible to increase the degree of accuracy in the current control at or near the zero-crossing point of the output current.
It is still another object of the present invention to provide an inverter controller which enables the inverter to perform a stable operation with respect to any kind of load.
To these ends, according to a first aspect of the present invention, there is provided an inverter controller for controlling the current flowing through the output terminal of an inverter having a series circuit formed by series-connecting electric valves each formed by connecting a semiconductor switching element and a diode in antiparallel with each other, the node of series connection between the electric valves being connected to the output terminal, and both ends of the series circuit of the electric valves being respectively connected to the positive and negative sides of a DC power supply, the controller comprising: command value calculating means for calculating an output current command value; a current control amplifier for calculating an ON/OFF signal on the basis of said output current command value, an inhibiting circuit for calculating (and outputting) an inhibiting signal to turn one switching element to OFF and any other switching element to ON/OFF on the basis of said output current command value; and ON/OFF signal calculating means for supplying an OFF signal to one switching element and an ON/OFF siganl to any other switching element on the basis of said inhibiting signal output from said inhibiting circuit and said ON/OFF signal output from said current control amplifier

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