Inverter device

Abstract

The invention provides an inverter device, including a bridge circuit composed of a plurality of bridged semiconductor switch members; a drive unit having an upper arm photocoupler and a lower arm photocoupler respectively outputting drive signals for turning on and off upper and lower arm semiconductor switch members of the bridged circuit; and a control unit including a drive signal generating circuit for generating the drive signal and supplying the drive signal to upper and lower arm photocouplers, wherein the control unit includes an upper arm shutdown circuit and a lower arm shutdown circuit which individually shutdown the drive signals of the upper and lower arm semiconductor switch members in accordance with shutdown signals input from the exterior, and the shutdown circuits carry out a shutdown operation in accordance with the shutdown signals, which have mutually inverted logics.

Description

technical field [0001] The present invention relates to an inverter device in which a function of cutting off a driving signal of a semiconductor switching element is redundant. Background technique [0002] The European standard "EN954-1" (ISO13849-1) is considered the basic safety standard for machinery. With regard to the European standard "EN954-1" as shown in Table 1, safety requirements required for mechanical devices and system performance corresponding to these requirements are classified by category. [0003] For example, in addition to the requirements of category "1", category "3" of Table 1 also specifies that the design should provide redundancy so that the safety function is not compromised due to a single failure. [0004] Table 1 [0005] category Requirements (brief description) system performance B Safety-related parts of machinery control systems and / or their Protective devices and their components should be prot...

AI Technical Summary

Problems solved by technology

[0029] However, in the case where, for example, the IGBT bridge circuit 123 has three phases, six gate signals are generated by the CPU 111, since the gate signals must be input to and output from the blocking circuits 112 and 113, wiring becomes complicated

Also, there is a problem that the mounting area of ​​the blocking circuit on the control unit 110B increases, and the size of the unit as a whole increases

[0030] For JP-A-9-238476 (paragraphs [0011] to [0023], figure 1 etc.), since the number of abnormality detection circuits, abnormality storage circuits, etc. needs to be consistent with the number of kinds of abnormalities, there is a problem that this leads to a more complicated and larger circuit configuration

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