This can be achieved by a process called rectification. If the negative half-cycle is reversed or eliminated, then the current ceases to alternate, and becomes a direct current. This means that the voltage flows in the same direction but is not necessarily constant.Ī sine wave is alternating current’s (AC) most typical waveform, and is positive for the first half-cycle but negative for the rest of the cycle. However, what defines direct current (DC) is the unidirectional flow of electric charge. It is commonly thought that DC voltage is a straight, unwavering line of constant voltage, like the type that comes out of a battery. Input signal rectification is the first step in switched-mode AC/DC power supplies. Rectification is the process of converting AC voltage to DC voltage. Figure 1 illustrates the general transformation from alternating current (AC) to direct current (DC) in a switching power supply.įigure 1: Isolated Switched-Mode AC/DC Power Supply Input Rectification But switching power supplies have taken over because they are smaller, more efficient, and are capable of handling high power. The need for smaller supplies for high-power applications means linear power supplies have become relegated to specific industrial and medical uses, where they are still needed because of their low noise. Before the voltage reaches the output, it’s filtered and rectified once again.įor many years, linear AC/DC power supplies have been transforming AC power from the utility grid into DC voltage for running home appliances or lighting. Then the voltage goes through a chopper, which converts it into a high-frequency pulse train. In switching power supply designs, the input voltage is no longer reduced instead, it’s rectified and filtered at the input. Switching: A switching power supply design is a newer methodology developed to solve many of the problems associated with linear power supply design, including transformer size and voltage regulation.These linear regulators dissipate any extra energy in the form of heat.
Linear power supplies use linear regulators to maintain a constant voltage at the output. Then the voltage is rectified and turned into a direct current voltage, which is then filtered to improve the waveform quality. Linear: A linear power supply designs use a transformer to step down the input voltage.There are two main designs for power supplies: a linear power supply and a switching power supply. Switching Converters and Controllers AECQ GradeĪ power supply is an electrical device that converts the electric current that comes from a power source to the voltage value necessary for powering a load, like a motor or an electronic device.BLDC Pre Drivers and Integrated Solutions.Battery Management System: Monitor & Protection.Digital Isolators with Integrated Power.Multi Phase Controllers & Intelli-Phase.
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