The main components of the isolation transformer and the control transformer are the primary coil, the secondary coil and the iron core (magnetic core), both of which belong to the toroidal transformer. What is the difference and connection between them? Next, let me elaborate for you.
1、 Difference between isolation transformer and control transformer:
(1) The definition of isolation transformer is different from that of control transformer
Isolation transformer refers to the transformer with electrical isolation between the input winding and the output winding. Isolation transformer is used to avoid accidentally touching the charged body at the same time. Isolation refers to isolating the current of the original and secondary coils. For example, in the maintenance of some color TV sets and air conditioners, 1:1 isolation transformer is often used as the safe isolation power supply.
As the name implies, the control transformer is mainly used for "control", mainly to transform the primary voltage to the voltage suitable for the electrical control circuit. For example, in the lathe control circuit, in order to ensure the safety of the operator, the lathe control circuit is generally reduced to 36V safe voltage, where a 380V to 36V control transformer is needed here.
(2) The purpose of isolation transformer is different from that of control transformer
The control transformer is mainly applicable to the circuit with AC 50Hz (or 60Hz), voltage of 1000V and below, and can work continuously for a long time under rated load. Usually used in machine tools, mechanical equipment as electrical control lighting and indicator power supply, in order to meet the voltage requirements of different electrical components.
Isolation transformer belongs to safe power supply, which is generally used for machine maintenance and protection, lightning protection and filtering. In the early stage, isolation transformer was used in the power industry in European countries, widely used in the control power supply, safety lighting and indicator power supply of general circuits in electronic industry or industrial and mining enterprises, machine tools and mechanical equipment.
(3) The functions of isolation transformer and control transformer are different
The control transformer provides power for the control system in the operation of electrical equipment;
The isolation transformer is used to prevent the harmonic interference of the power supply equipment. In fact, it is a filter with poor performance.Generally, the output voltage of control transformer is 6.3V, 12V, 24V, 36V, 50V, 110V, 127V, etc. To reduce cost, some control transformers only output a single low voltage, or three to five voltages. The transformer ratio of isolation transformer is 1:1. The function of isolation transformer is different from that of control transformer, so it is not universal.
2、 Connection between isolation transformer and control transformer:
Isolation transformers can also be defined as control transformers.
For example: In an imported driving electrical circuit, all relay contactors and other electrical equipment are 220 volts, and the power input is 3-phase 4-wire.It could have used the zero line to form the control loop. However, this driving has a control handle, and the electrical designer uses an isolation transformer, and the secondary is used as the power supply of the electrical control loop. Since this secondary loop has no ground terminal, even if people touch one of the 220 volt control voltage Electric shock will not occur, so this transformer is both a control transformer and an isolation transformer.