In today's high-performance power system designs, ensuring reliability is critical so efficient features must be able to handle potential problems. Synchronous rectification current reversal is such a problem. This occurs when the capacitor current (parasitics) causes the MOSFET to be prematurely activated at light loads and then the reverse current flows back from the output capacitor back to the synchronous rectifier. This not only causes the system energy efficiency to be seriously affected, but also may lead to operational failures.
To prevent this from happening, steps must be taken to increase the delay when the system is under light-load conditions. Adaptive dead-time control mechanism can make up for the existence of parasitic inductance, thereby reducing the adverse effects of body diode conduction. In this way, the synchronous rectifier shutdown point can be adjusted to maintain a constant dead time regardless of the output load at that time. Thus sustaining energy efficiency and requiring fewer thermal management regulations (due to reduced heat dissipation).
Thanks to its proprietary adaptive dead-time control algorithm, ON Semiconductor's FAN6248 dual MOSFET driver controller IC addresses these challenges. At the same time, it helps engineers maximize power efficiency and make the system as compact, simple and cost-effective as possible.
The device is optimized for use in modern LLC resonant converter topologies, minimizing body diode conduction in synchronous rectification MOSFETs. By eliminating the risk of reverse current by using a unique control method, it also avoids synchronous rectification false triggering. With two sense inputs, the drain-to-source voltage across the MOSFET can be accurately determined, allowing for any asymmetric or poor coupling of the secondary winding. If it is confirmed that the dead time is too long, then the bias voltage will be reduced accordingly. This increases the MOSFET's voltage threshold, which in turn extends the on-time of the synchronous rectifier (thus shortening the associated deadtime). Conversely, if the dead time is too short, the voltage threshold of the MOSFET is reduced, thereby inhibiting the conduction period of the synchronous rectifier. Designating a FAN6248 controller increases the power efficiency of the system and enables stable operation over the entire load range without the risk of reversing the current.
Watch the FAN6248 Evaluation Board demo video and visit the website for more information.
Details of steel bar Straightening Machine
Easy to disassemble, easy to carry and install, and equipped with digital control device, which can be positioned according to customers' different requirements, quantity and length.
Straightening speed, cutting is correct, no noise, no cut, adjustable straight Φ 4-14 plates reinforced with Φ Φ level 4 - Φ 12 reinforced bar, suitable for all kinds of construction site and reinforcing steel bar processing.
Product features of steel bar straightening machine
There are automatic steel cutting machine and semi-automatic steel cutting machine.
Automatic cutting machine is also called electric cutting machine, which is converted from electric power through motor to kinetic energy to control cutting knife incision to achieve the effect of shearing steel.
While semi-automatic is manual control of the incision, so shear reinforcement operations.
And at present more should belong to hydraulic Steel Bar Cutting Machine.
Hydraulic steel Bar Cutting Machine is divided into two categories: charging type and portable type.
1. Microcomputer control, automatic straightening and automatic cutting.
2. Simple operation and simple use.
3. Small occupation and convenient disassembly and assembly.
4. The computer can store memory efficiently and conveniently.
5. Smooth operation, low fault rate and convenient maintenance.
6. The machine body is fully protected by iron case, so it is safer and more reliable to use.
Classification of steel bar straightening machine
It is suitable for cutting all kinds of plain carbon steel, hot steel round steel, screw steel, flat steel and square steel in construction engineering.
Steel Bar Straightening And Cutting Machine
Cnc Cutting Machine,Steel Straightening Machine,Sheet Bar Machine,Straightening Cutter Machine
Shandong Luteng Building Equipment Co., Ltd. , https://www.drillrig.nl
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