An electronic ballast, which is a type of ballast, refers to an electronic device that uses electronic technology to drive an electric light source to produce the desired illumination. Corresponding to this is an inductive ballast (or ballast). Modern fluorescent lamps are increasingly using electronic ballasts, which are light and compact, and can even integrate electronic ballasts with lamps. At the same time, electronic ballasts can usually have a starter function, so it can save Go to a separate starter. The electronic ballast can also have more functions, such as improving or eliminating the flickering of the fluorescent lamp by increasing the current frequency or current waveform (such as becoming a square wave), or using the DC power supply by the power inverter process. The figure shows an electronic ballast circuit consisting of a MPIC2151 self-oscillating monolithic chip.
The method of wax loss originated in the Spring and Autumn Period. The bronze ban of the Spring and Autumn Period unearthed from the Chu Tomb no. 2 of Xiasi in Xichuan, Henan province is the earliest known wax loss casting. The four sides and sides of the bronze ban are decorated with carved moire pattern. There are 12 vertical carved animals around the bronze ban, and 10 vertical carved animal feet under the bronze ban. The carving patterns are complicated and changeable, and the shape is gorgeous and solemn, which reflects that the wax loss method has been relatively mature in the middle of spring and Autumn period. After the Warring States, Qin and Han dynasties, the wax loss method became more popular, especially during the Sui and Tang dynasties to the Ming and Qing dynasties, the wax loss method was mostly used in casting bronzes.
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