PWM wave based multi-channel 4-20 mA control command converting system
A technology of control command and conversion system, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of 4-20mA signal conversion circuit accuracy not reaching power electronic devices, high price, low reliability, etc. Anti-interference ability, less pulsating components, and reliable operation
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[0068] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0069] Such as figure 1 Shown is a schematic diagram of the principle of a specific implementation of the multi-channel conversion system. The multi-channel conversion system of the present invention includes a controller unit (1), a level conversion unit (2), an isolation conversion unit (3), a low-pass filter unit (4), a 4-20mA voltage / current conversion unit (5), a current The signal transmission cable (6) and the load interface unit (7) consist of seven components in total.
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