![]() ↑ What's the difference between AC and DC?.To learn more about how SMPS units work, visit Learn about Electronics.įor further information please see the related pages below: SMPS is used in many applications such as battery chargers, laptops, vehicles, LED lighting, and other consumer electronics. The main advantage for SMPS is that it gives DC supplies that can deliver more power for a given size, cost and weight of the adapter. These are considerably more complex than linear regulated power supplies and have clear advantages. In modern use the most common adapter is the Switched Mode Power Supply (SMPS). Also called an AC adapter or charger, power adapters plug into a wall outlet and convert AC to a single DC voltage. However, some ripples from the AC voltage remain (See Figure 4). Essentially it releases stored energy when no voltage is being output from the rectifier. Explore a wide range of the best 7.5v ac adapter on AliExpress to find one that suits you Besides good quality brands, youll also find plenty of discounts. At its simplest, a circuit component known as a reservoir capacitor or smoothing capacitor is placed at the output of the rectifier. A smoothing circuit or capacitor is used to achieve this. Mouser is an authorized distributor for many AC Adapter manufacturers. However, a constant voltage is required for most devices that operate on direct current. AC Adapters are available at Mouser Electronics from industry leading manufacturers. Note the ripples in the output voltage.Īs seen in Figures 2 and 3, the output voltage of the two rectifiers still varies greatly. The output voltage (green) of a half-wave rectifier and smoothing capacitor from the input AC voltage (yellow). Due to half of the current being blocked, much of the supplied energy is lost, and the mean voltage of half-wave rectified power is lower than that of full-wave rectified power.įigure 4. The half-wave rectifier effectively blocks current flow in one direction through the use of a diode (see figure 2). Run the cable between the AC adapter and iPod dock connector port ( or. There are two separate types of rectifiers: the half-wave rectifier and the full-wave rectifier. Flip out the electrical prongs tucked into the adapter's end, and plug it into a. A rectifier then converts alternating current into direct current. The transformer initially converts a relatively high- voltage alternating current that is supplied by an electrical outlet to a lower voltage suitable for the device being powered. See Standby power for more detailed information.Ī simple AC adapter consists of a transformer, a rectifier, and an electronic filter. Older AC adapters waste quite a bit of electricity in the form of standby power, but recent regulations and subsequent innovations have reduced the amount of electricity wasted considerably. Direct current is also required to recharge batteries, making AC adapters essential for electronic devices like laptops (see Figure 1) and cell phones. An AC adapter used for charging a laptop battery.ĪC adapters convert a higher-voltage alternating current to a lower-voltage direct current for use with devices that require a relatively constant voltage (within a tolerance).
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