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Induction heating power supply using IGBT ultra-audio


During inverter failure, but also to prevent the small-signal frequency of the next line can not find the self-excited driving IGBT drive conditions 23IGBT can be two ways to drive active or passive, passive driver is relatively simple circuit, but not very convenient to adjust the waveform , we use Fuji 841 lines (Figure 3) has been described in many articles of the line, where only two questions (1) well protection in the 841 pulse is not completely blocked, which pose a threat to the equipment components, so we have flow between the output and driver input in order to add an RS flip-flop has been completely blocked when the current output driver input pulse. Figure 3841 block diagram (2) 841 overcurrent detection IGBT gate turns on the voltage between CE, when more than 6V, the delay 1Os is judged as over-current. However, we found lot of practice to ask IGBT CE voltage of 6V at the time of damage, so we IGBT extreme 841 C-6 foot string of a 3V regulator, to test the value of 841 reduced by a 6V 3V. Practice has proved that an increase of 841 pairs was significantly improved over-current to determine the sensitivity, so that the drive line components can not only normal but also in more effective overcurrent protection components. 2.4 overcurrent and overvoltage protection (1) the relative SCR IGBT over-current protection against over-current capability is relatively weak, so be sure to protect the IGBT circuit design security. Here we mainly use two methods: one 841-current protection, greater risk in this way; the second is in the reactor and a series between the inverter bridge input current sensor, the output value when it exceeds a predetermined value, On the one hand block pulse rectifier, inverter pulse blocked the other hand, through this design we have successfully passed the test of short circuit test. (2) over-voltage protection circuit in the oscillation of our two main over-voltage generated: one with the load current and voltage angle increases, the load voltage will become high,[link widoczny dla zalogowanych], which would pose a threat components, the solution Figure 4 is a bridge inverter absorbed form of control lock RC 0 degrees, while the applied voltage across the load sensor detects the voltage is too small, too large as to be controlled. Second, the process of commutation voltage spikes, a phenomenon mainly by adding RC absorption (Figure 4), it is noteworthy that the inverter circuit diode RC also need to increase absorption. Application examples 3.1 3IGBT welding power air conditioning compressor air conditioning compressor liquid can liquid can part as shown in Figure 5,[link widoczny dla zalogowanych], where ① @ as copper, ② the steel, one in ① ②, ② ③ Connect a Department welding, welding and requires almost no bright surface deformation. We use IGBT20kW a 40kHz ultrasonic frequency power, with the success of Taiwan nitrogen solve this problem, in order to improve efficiency we have adopted a match of two power transformers at the same time, followed by two welding tasks to complete each part, each of the welding process 4 ~ 5s agreed time, welding, smooth surface, no distortion. Figure 5 from the 00 storage tanks crossing the shape of the melting point of 32 smelting platinum platinum 1800 ℃, is relatively difficult to melt, the source tube used in the past, but it is the volume too high power consumption, difficult to control, in many occasions, particularly inappropriate in the laboratory. Foreign use of solid state power supply, but the introduction of the price is very expensive (about my factory product 5 ~ lO times) we use the IG-BT of a 30kW one 20kH ~ Super Audio Power successfully solved this problem, the device is small,[link widoczny dla zalogowanych], the rapid melting control accuracy providers, reliable and durable and so on. Refrigerator Compressor 3.3 brazing copper shell is usually high frequency welding. I used a factory production plant is a 20kW20kHz IGBT ultra-audio power, the heating efficiency (up to 85), the oscillation uniform, rapid heating, to the use of a 303H HFB produced in Japan for a week crossing high-1A T brazing equipment a 10 super audio power level, the state saves a lot of foreign exchange. 3.4 roller bearing partial quenching (annealing) requires a factory roller bearing surface hardening and partial annealing. I used the induction heating power plant equipment, the technology test, were successful. It is particularly worth mentioning is that the tube has a strong high-frequency electromagnetic fields around power radiation, such as long work in this environment, the health of the operator is harmful. I plant research La IGBT ultra-audio power,[link widoczny dla zalogowanych], the output voltage,[link widoczny dla zalogowanych], radiation, high frequency power supply is much lower than the tube, the measured electromagnetic field strength around the radiation, did not exceed the national standard. According to statistics, China is still 100kw-class high-frequency power 1 million units in operation in all areas of production, but also an increase of nearly 1,000 a year, the situation is very serious waste of energy. We believe that the IGBT ultra-audio power has broad application prospects, and in many areas of the national economy will play a good role

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