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Telepathic transmission

  Do you believe that two coils can transmit energy or signals without direct contact with each other? This magical transmission method is quite similar to the magical telepathy. The telepathic superpower can transmit certain messages to the heart of another person in a distant place through channels other than ordinary senses, or the human body releases energy to remotely control external things, etc. . The phenomenon of mutual induction can realize such magical non-contact transmission.
  Mutual inductance, literal meaning, mutual induction, when the current in one coil changes, an induced electromotive force is generated in another adjacent coil (the electromotive force is the voltage when the power supply is open circuit, marked on the No. 7 dry battery used in various remote controls at home 1.5V refers to the phenomenon that its electromotive force is 1.5 volts). Mutual inductance is a common electromagnetic induction phenomenon, which not only occurs between two coils wound on the same iron core, but also occurs between any two circuits that are close to each other. The phenomenon of mutual induction is widely used in electronic technology. Through the mutual induction coil, energy or signal can be easily transmitted from one coil to another coil. Transformers, transformers, welding machines, clamp ammeters, etc. work on the principle of mutual inductance.
  We live in a world of electricity, and there are countless uses for electricity. If the power goes out for a day, it will be very inconvenient. But how is electricity delivered to thousands of households by power plants? Among them, the credit of the transformer is indispensable. A transformer is a device that transforms AC voltage, current, etc. It is composed of an iron core and a coil. The coil has two or more windings. The one connected to the power supply is called the primary coil, and the remaining windings are called the secondary coil. Transformers use the principle of electromagnetic induction to transfer electrical energy or signals from one circuit to another. When an alternating current flows through the primary coil, an alternating magnetic flux is generated in the iron core, which induces a voltage (or current) in the secondary coil.
  There are many types of transformers, including step-up transformers, step-down transformers, power transformers, voltage regulating transformers, audio transformers, intermediate frequency transformers, pulse transformers, etc. In life, transformers can be seen in the streets and lanes and in residential areas. This is the step-down transformer in the power transmission system. There are also transformers in many appliances. There is an intermediate frequency transformer in the radio, which is used for frequency selection and interstage coupling. In daily life, the voltages used by various household appliances are different, so a power transformer must be used to convert the 220V AC mains into a low-voltage AC, and then rectified by a diode and filtered by a capacitor to form a DC power supply. transformer. The TV picture tube needs tens of thousands of volts to work, which is supplied by the “line output transformer”. There are pulse transformers and the like in color TV sets.
  The electric welding machine uses the high-temperature arc generated when the positive and negative poles are short-circuited instantaneously to melt the solder on the electrode and the material to be welded, so that the objects to be contacted are combined. The working principle of an ordinary electric welding machine is similar to that of a transformer. It is a high-power step-down transformer. The two ends of the secondary coil are the workpiece to be welded and the welding rod. The arc is ignited, and the high temperature of the arc generates a heat source that fuses the gap between the workpiece and the electrode. There are arc welding, plasma arc welding, ultrasonic welding, electron beam welding and laser welding. Electric welding is an economical and technologically advanced method of material joining. Electric welding can realize almost any two kinds of metal materials, and welding between some metal materials and non-metal materials. It can give full play to the characteristics of various materials, has good air tightness, and can realize welding between ultra-thin and ultra-fine materials, etc. features. Today electric welding has been widely used in machinery, electronics, construction, shipbuilding, aerospace, energy and other departments.
  The sky is densely covered with high-voltage power grids. Power plants implement high-voltage long-distance power transmission in order to send power quality (low power loss) to every corner of the world. The voltage can reach 500 kV or even 750 kV. How can such a high voltage be measured? , protection equipment and automatic control equipment requirements? That’s where the transformer comes in handy. The transformer is composed of one or more current or voltage sensors connected between the primary and secondary of the power transmission system. It is a kind of special transformer that can convert high voltage or large current into low voltage or small current in proportion. Cooperating with relay protection and automatic devices, it can protect and automatically control various faults in the power grid, and can also be used to isolate high-voltage systems to ensure the safety of people and equipment. There are current transformers, voltage transformers, photoelectric transformers, etc. Photoelectric transformers are essential equipment for smart grids, and my country’s photoelectric transformer products are world-class.
  Mutual inductance is also harmful. For example, wired telephones often cause crosstalk due to mutual inductance between two telephones. In radio technology, if the position of the coil is improperly placed, the coils will interfere with each other due to mutual inductance, which will affect the normal operation of the equipment. The solution is to place two adjacent coils perpendicular to each other or to increase the distance between several coils. In high-frequency circuits, shields are often made of soft magnetic materials.

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