21.01.2014

Dc to dc full bridge converter

Switched Mode Power Supplies (SMPS) are used extensively in most of the power conversion processes due to their efficiency and compactness. Allegro AMS Simulator (PSpice) gives you an option to reduce your effort by simulating your design before going for the real hardware design.
MOSFETs M8 and M11 are switched on simultaneously for an adjustable time during one half period. Figure 2 shows a schematic diagram of a full-bridge DC-to-DC converter used for analysis and simulation. For the purpose of analysis, a complete cycle of operation is divided into eight distinct intervals for the inverter. Due to the voltage drop across the MOSFET and rectifier diodes, the turn ratio can be considered as 11. Related articlesWhat's Good About Allegro PCB Editor Suppression of Unassigned Indirect Vias? To use this to charge batteries or power most lighting and devices directly, it must be rectified into direct current (DC).The simplest (full wave) bridge rectifier is made up of just four diodes (components which allow electricity to flow in just one direction). The following is an excerpt from an app note* that provides details on designing and simulating SMPS using AMS Simulator with a real-time test circuit.


MOSFETs M9 and M10 are switched on simultaneously for an equal time during the alternate half period. Capacitors C1 to C4 represent the output capacitances of the MOSFET including any external snubber capacitors that are added. If the primary magnetizing inductance is considered as 10mH, secondary coil inductance will be 1210mH. D42, D43, D44, and D45 form the bridge rectifier circuit at the transformer coil secondary. The diagram below (taken from our Introduction to Bridge Rectifiers) shows how the four diodes are wired together and also shows how electricity flows through it as the current alternates.Three Phase Bridge RectifiersTypically wind turbines do not generate single phase AC (displayed in the above example), but instead generate multi-phase AC - usually three-phase AC electricity.
Most of these developments were centered on hard-switching converters where the switching frequency was limited to a few KHz. Lm and LLk represent the magnetizing and leakage inductances, respectively, of the transformer. The present direction of evolution in SMPS is towards high efficiency and higher power conversion density. To make a three phase bridge rectifier is a simple case of wiring them together and then to each of the three phases of generated electricity.


Click here to find out how to make a three phase bridge rectifier in this way.Pictured above is an example of a 35A bridge rectifier (available for sale through this website). The designing and testing of SMPS is cumbersome work and require lots of trial and error methods to get the right output.
IRF541 also has low driving requirements, high power dissipation, and a high-operating switching frequency.
Therefore if your wind turbine has a total maximum output current of more than 25-30 Amps, it is worthwhile making your own bridge rectifier with high power rated diodes wired as shown above but fitted to a suitably large heatsink.High Current High Voltage DiodesDiodes are available in a massive range of voltages and currents.
Here is a list of a few example diodes which can be used in bridge rectifiers for high current applications:1N4045 Rectifier Diode - rated up to 275 Amps at voltages of up to 100 Volts. These are particularly suitable for 12V wind turbines which will not exceed 100 Volts, but may generate high currents.



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