The main cost of a two-switch flyback circuit is that it requires a floating high-side drive compared to a single-switch flyback circuit. A gate drive transformer is typically used for the high side FET of a two-switch flyback circuit, and the use of a gate drive transformer requires some skill. If the core is not properly reset within each cycle, it may be saturated. One of the most common drive technologies is the use of an AC coupling capacitor in series with the drive winding. This capacitor forces the average current to 0A, which ensures that the transformer will not saturate. However, it is still possible to saturate during transients, and the DC information of the drive signal will be lost on the secondary side of the drive transformer. Figure 1 shows a simple method of driving a transformer when it is not necessary to use a coupling capacitor. When the drive signal goes high, the small signal FET, Q2 is turned on, and the drive voltage is applied to the winding of the transformer. When the drive signal goes low, it pulls the same end of the winding down to ground and turns off Q2. When Q2 is off, the magnetizing current in the transformer is forward biased to D1, and in the opposite direction, VDD is applied to the transformer windings. For less than 50% duty cycle, the transformer is guaranteed to be fully reset. By adding a Zener diode in series with D1, you can extend the duty cycle to more than 50%. This driver circuit offers two additional advantages. First, all of the magnetizing energy is recovered to VDD, which increases efficiency. Second, during the magnetization reset, the driving of the FET is achieved by a negative drive. This negative drive reduces switching losses by speeding up the turn-off time. Figure 1: Using a simple circuit like this to easily drive a transformer This simple drive circuit ensures proper reset of the drive transformer and increases efficiency.
Glass Insulator is used to support and insulate electrical wires. The most widely used in the production line are tempered glass insulator. Now days Glass Insulator For High Voltage has become popular in transmission and distribution system. Annealed tough glass is used for insulating purpose. Glass insulator we have Standard Type Disc Insulator, Blue Glass Insulators ,Fog Type Disc Insulator and Open Air Profile Disc Insulator, it has numbers of advantages over conventional Porcelain Insulator .
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Advantages of Glass Disc Insulator
1. It has very high dielectric strength compared to porcelain
2. Its resistivity is also very high
3. It has low coefficient of thermal expansion
4. It has higher tensile strength compared to porcelain insulator
5. As it is transparent in nature the is not heated up in sunlight as porcelain
6. The impurities and air bubble can be easily detected inside the glass insulator body because of its transparency
7. The surface of the glass insulator has high mechanical strength,it profect the surface from cracking.Compared with porcelain insulator,the aging process is much slower
8. Glass is cheaper than porcelain
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