1 Inverter power supply in Panasonic microwave oven Kuroda Hiroshihiro 1 Inverter technology in the field of home appliances 1.1 Concept of inverter technology The power supply used in traditional household electrical appliances can directly deliver energy to the load without conversion, thereby allowing users to obtain different forms of energy. However, the AC or DC power supply used in inverter products is converted into high-frequency AC by the inverter. Advantages of such a frequency conversion system 1.
First, we can control the output power linearly during the frequency conversion.
First, we can obtain high efficiency and save energy. It can be said that the inverter can provide the most suitable power supply method, and usually the inverter is significant in converting energy.
1.2 The historical heater applied by frequency conversion technology. Since 1985, it has been gradually applied to microwave ovens, rice cookers, refrigerators and air conditioner lamps. Recently, washing machines have also begun to use frequency converters. One aspect involved here is to heat the metal bakeware by inducing high-frequency magnetic flux, to control the motor speed by transforming voltage, and to use high-frequency energy to reduce the scale of the booster transformer. Therefore, the frequency conversion technology will enter various fields of home appliances.
1.3 Frequency used by home appliances Use frequency 3. Because of the use frequency, electromagnetic interference noise becomes a defect of the inverter. We must overcome this fatal flaw.
1.4 The frequency converter in the microwave oven is turned on and off by the frequency converter switch, and the voltage of the commercial frequency becomes higher. We can use a small iron core in the system. Based on this principle, the high frequency and high voltage are obtained on the secondary side as usual, and sufficient DC voltage is obtained after rectification to drive the magnetron to work, and the output power can be changed by controlling the on and off of the switch in the inverter.
The chemical treatment improves the anti-blackening performance of the hot-dip galvanized steel sheet. Due to the high zinc adhesion of the hot-dip galvanized steel sheet, the effect of preventing red rust is good. Therefore, it is widely used in the building materials industry. Formed after solidification. This hot-dip galvanized steel plate is characterized by a beautiful appearance and is used in many occasions. In order to form this hot-dip galvanized steel plate pattern, the aluminum 1 element of 0. stone is added to the hot-dip galvanizing tank. However, lead is to make the galvanized layer black and affect its aesthetics, so improvement is required. The Research Institute of Integrated Materials Technology of Japan Civil Anti-Corporation Company studied the cause and mechanism of blackening of standard hot-dip galvanized steel plate containing aluminum. The hot-dip galvanized steel sheet with good anti-blackening performance was developed by chemical treatment.
The test material is a standard hot-dip galvanized steel plate, the amount of zinc attached to one side is 9, 1. The composition of the hot-dip galvanizing bath solution is 0.10.14, and the rest is 2 core chromate treatment. There are four kinds of chromate treatment liquids, without adding cations, adding phosphate ions, adding fluoride ions, and adding nitrate ions. The evaluation of the anti-blackening performance is 959 at 80 t, and the measured value after RH24H changes before and after 1. Next. Regarding the evaluation of corrosion resistance, the test was carried out under the conditions of a salt spray 33 ° C test.
The test result of anti-blackening performance is that the addition of nitrate ion 031 to the chromate solution is the best. The reason for the blackening of the zinc plated pattern steel plate is that the auspicious elements and lead elements in the coating form a micro battery, which causes corrosion and blackening. The addition of nitric acid ions and aluminum to form a compound in the chromate treatment solution to prevent aluminum and zinc from forming micro-batteries will improve the anti-blackening performance of the hot-dip galvanized steel plate. Second, it has the same corrosion resistance as other ion treatment methods.
Cao Chang'e excerpted from seven materials and seven, edited by Ju Naiyang in December 1999
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