Description

The A-B 1746-IV32 is A power module manufactured by the Allen-Bradley (Rockwell) company.

Basic information
Brand: Allen-Bradley (Rockwell)
Model: 1746-IV32
Technical features and functions
Power supply function:
The 1746-IV32 is a power supply module designed with a stable output voltage of 20V, while the output current can vary between 0 and 2A. This design makes the module particularly suitable for applications where a stable power supply is required.
In order to reduce the electromagnetic noise and improve the stability of the circuit, the module adopts advanced processing technology, and uses a single switching power supply chip TOP224Y to design. TOP224Y integrates all circuits required for PWM modulation and the output of the driver tube, by which the transformer is excited, the switching frequency is 100kHz, the internal MOS driver voltage is 700V, and the output power is less than 45W.
Circuit structure:
The circuit structure of the module consists of a conventional common-mode filter and rectification circuit, which is used to obtain a DC voltage of about 300V for the DC-DC conversion circuit.
It also includes an ordinary LC filter circuit and a voltage feedback circuit composed of IC2, D8, R9, R10 and other components to form a closed-loop structure to stabilize the output voltage of the power supply.
The DC-DC converter is a key part of the circuit and is essential to reduce noise. In this part, TOP224Y is used as the main component of PWM control and excitation, and the working voltage of its control end C is taken from the reverse excitation voltage of the transformer.
Protection mechanism:
In order to prevent the chip from breakdown due to overvoltage, the limited voltage protection circuit is provided in the module, which is composed of semiconductor varistor and light-emitting diode.
Application scenario
The A-B 1746-IV32 module is commonly used in industrial automation control systems that require A stable power supply, such as PLC (Programmable logic controller) systems, DCS (distributed control system), etc. In addition, due to its low noise design characteristics, the module is also suitable for applications with high electromagnetic environment requirements.

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