Electromagnetic heater power with over-voltage protection function

Abstract

The invention discloses an electromagnetic heater power with the over-voltage protection function. The electromagnetic heater power includes a circuit, wherein the circuit is electrically connected with an overvoltage and undervoltage protection circuit, the circuit is electrically connected with a circuit board, the overvoltage and undervoltage protection circuit is electrically connected with anovervoltage and undervoltage protection circuit board, the overvoltage and undervoltage protection circuit board has an overvoltage and undervoltage protection circuit board; or the overvoltage and undervoltage protection circuit board has two sub overvoltage and undervoltage protection circuit boards, and one overvoltage and undervoltage protection circuit board has an overvoltage and undervoltage protection circuit; or one overvoltage and undervoltage protection circuit board has two sub overvoltage and undervoltage protection circuits, and the two sub overvoltage and undervoltage protection circuit boards respectively have sub overvoltage and undervoltage protection circuits. The electromagnetic heater power is advantaged in that when a supply voltage is too high or too low, power supply can be cut off quickly, and an insulated gate bipolar transistor (ie: IGPT) is prevented from being burned out.

Description

technical field [0001] The invention relates to a power supply, in particular to an electromagnetic heater power supply with overvoltage and undervoltage protection functions. Background technique [0002] The electromagnetic heater power supply is an essential power supply equipment for the electromagnetic heater. Since the applicant applied to the Chinese Patent Office on February 17, 2014 for a patent titled "A Handheld Electromagnetic Heater" with a patent number of ZL201410053724.2, he has been committed to the development and research of handheld electromagnetic heaters and electromagnetic heater power supplies. . like figure 1 As shown, the initial electromagnetic heater power supply includes a chassis 4, and the chassis 4 constitutes a heat dissipation chamber 5 as a whole. A circuit board 1 is arranged in the heat dissipation chamber 5, and a radiator 2 is fixed on the circuit board. The radiator 2 is an aluminum radiator, and the heat dissipation chamber 5. Air ...

AI Technical Summary

Problems solved by technology

At that time, there was no way to prevent the dust from entering the case. We had to clean up the dry dust from the power case of the electromagnetic heater and replace it with a new circuit board for the user to continue using.

The second technical problem is that the power supply of the electromagnetic heater is damaged due to the over-undervoltage.

Because the four-eye power strip is made of Bakelite, it is not only brittle but also heavy, and it is easy to collide and damage when walking and moving. When working, it is inevitable to pull the wires, and the wire ends are easy to pull out from the power strip, or the power strip has been damaged. It is fully plugged, or the wire close to the plug is broken. At this time, it will take a long time for the user to find an electrician to solve the problem. In many cases, they are unwilling to wait. I don’t know much about electricity usage, so I thought it would be enough to connect it. In addition, I don’t have any tools at hand. Most of the time, I use my mouth to bite off the end of the thread, hook the two threads on the two fuses of the three-phase switch knife, or Plug it into the two live wire holes of the four-eye socket, so that when the power is turned on, it will be 380 volts, and the machine will be burned directly

2. Zero drift

Because there are many places in the tunnel where the construction environment is harsh at the same time, it is easy to break the zero line in the middle, causing the zero point drift of the equipment in front of the construction to damage the equipment

3. Line voltage drop

Because in the traditional process, the plug-in strip is used for the climbing welding machine and the angle grinder, and the power of the climbing welding machine and the angle grinding machine is generally only a few hundred watts, so the diameter of the wire equipped with the plug-in strip is only 1.5 square millimeters to 2.5 square millimeters, because this electromagnetic heater is a new product of 3500 watts, although it is emphasized in the instruction manual to use cables with a diameter of more than 4 square millimeters, it is still ignored by many workers, and it is also because the electromagnetic heater works every time For two to three seconds, pause for one to two minutes, so although the line is overloaded, it will not cause high temperature in the line, so it will not be noticed, but the voltage drop of each working voltage is particularly large, the voltage before shooting is 230 volts, After shooting, it drops to 150 volts. Such a large voltage drop will cause great damage to various components.

At the same time, the transformer of the tunnel is installed outside the entrance of the tunnel, and the tunnel is continuously excavated. The diameter of the following wires cannot meet the needs of large electrical equipment, and the cables used in the mobile electric box are limited by the frequent and convenient movement, and the wire diameter is not large. When using the same line with large electrical equipment, especially the electric welding machine works on the same line, the electromagnetic heater will be affected by the voltage drop of other electrical equipment

The above three reasons will cause damage to the components in the electromagnetic heater power supply, especially the insulated gate bipolar transistor (ie: IGPT) in the electromagnetic heater power supply. The insulated gate bipolar transistor (ie: IGPT) are very expensive

Due to the lack of electrical knowledge of the staff, the 220V electromagnetic heater power supply is connected to the two live wires of the 380V four-wire three-phase knife switch, causing accidents that the electromagnetic heater power supply is immediately damaged.

In addition, the line voltage drop also has a great influence on the power supply of the electromagnetic heater.

The third technical problem is that the heat dissipation effect of the aluminum radiator is not very ideal

When the applicant solved the third technical problem, he adopted a radiator made of pure copper material, and the heat dissipation effect was very ideal. However, the manufacturing cost was very high, and the gain outweighed the loss by adopting such a technical solution.

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