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What is a control transformer?

I think everyone has seen transformers, especially those who are engaged in circuits. Transformers are very important components in industrial and living circuits. Of course, transformers also have many classifications, and they are all called different names. It is applicable to different scenarios and has different functions. Below we will give an explanation on the control transformer.

Control transformers belong to a wide range of transformers, and they also use the principle of electromagnetic induction. Because it is a transformer that supplies power to control electrical appliances in the control circuit, it is called a control transformer, which is mainly suitable for AC 50HZ-60HZ circuits.

The power supply for the control transformer and electronic tube equipment is also an isolation transformer. Power supplies such as tube amplifiers, tube radios and oscilloscopes, and lathe control transformers are all isolation transformers. For example, a 1:1 isolation transformer is commonly used for safe maintenance of color TVs. It is also used in air conditioners.

The control transformer is mainly suitable for AC 50Hz (or 60Hz), voltage 1000V and below circuits, and can work continuously for a long time under rated load. Usually used in machine tools and mechanical equipment as electrical control lighting and indicator lights. Commonly used parameters in practical applications are 380V to 220V, 380V to 36V, 380V to 24V, 380V to 12V, and 220V to 36V, 220V to 24V, and 220V to 12V. In addition to being used as a buck-boost power supply, the control transformer can also transmit signals. That is to say, the control transformer is an electrical appliance that can transfer electrical energy or signals from one circuit to another.

The control transformer works on the principle of electromagnetic induction. The transformer has two sets of coils. Primary coil and secondary coil. The secondary coil is outside the primary coil. When the primary coil is energized with alternating current, the transformer core generates an alternating magnetic field, and the secondary coil generates an induced electromotive force. The turns ratio of the windings of the transformer is equal to the voltage ratio.

The most important and obvious feature of the control transformer is that the capacitive current to the ground of the system is too small to cause personal injury, protect personal safety, and control dangerous voltage. The control transformer uses complete electrical insulation between the primary side and the secondary side, that is, to isolate the loop. But the principle of controlling the transformer is the same as that of the ordinary transformer. All use the principle of electromagnetic induction. The control transformer also uses the characteristics of the high-frequency loss of its iron core to suppress high-frequency clutter from entering the control loop. A control transformer is used to suspend the secondary to the ground, which is used in occasions with a small power supply range and short lines.