What about a single-cell Li-Ion battery-powered portable system step-up/step-down converter?
Almost every portable system requires a 3.3V rail. For systems powered by a single-cell lithium battery, users always ask how to implement this power rail. Boost the battery voltage (typically between 3V and 4.2V) to 5V and then step down 5V to 3.3V, which causes the power supply to undergo a double conversion. The efficiency of the two power conversion steps is the product of the efficiency of each conversion in these conversion steps, so the overall efficiency of the situation I described is relatively low. For example, if the boost converter has an efficiency of 90% and the buck converter has an efficiency of 95%, then the overall efficiency is only 85.5%. There must be a good way to generate this 3.3V voltage with a lower energy consumption. Using the TPS63025 buck-boost converter family can provide greater efficiency in these situations. By combining a buck converter with more than 95% efficiency with a boost converter with more than 90% efficiency, the conversion efficiency can reach 95% or more based on different battery voltages (see Figure 1). The buck-boost converter does not double convert the power supply, but instead operates as a buck or boost converter as needed. As efficiency increases, the temperature rises and the battery runtime increases. Figure 1: Comparison of TPS63025 efficiency and output current You can design a buck-boost converter in any portable system. If you're designing a smartphone, a Wafer Level Chip (WCSP) package offers the smallest solution size and can be easily produced in high-density systems. But for industrial devices like barcode scanners, you don't have to worry about saving every square millimeter on a printed circuit board (PCB). These application types are available in standard quad flat no-lead (QFN) type packages with solder fillets and visual inspection during manufacturing. With the new buck-boost converters, TPS630250 and TPS63050 series devices, engineers can now choose their package type. The YFF package (WCSP) is preferred if the absolute minimum size is required, and the RNC package (QFN) can be used if the manufacturing requirements are less stringent. Either way, these devices offer a 3.3V rail powered by a single-cell Li-Ion battery with over 90% efficiency—providing engineers with more choices and applications. What are your applications that should not be packaged with WCSP? Bi Directions Thyristor (Triac) Bi Directions Thyristor (Triac) is equivalent to the antiparallel connection of two unidirectional thyristors, but only one control pole. Bi Directions Thyristor,Electronic Components Triac,Power Thyristor For Inverter,Silicon Power Bipolar Transistors YANGZHOU POSITIONING TECH CO., LTD. , https://www.pst-thyristor.com
Bidirectional thyristors are made of N-P-N-P-N five-layer semiconductor materials, and three electrodes are also derived from the outside. Its structure is shown in the figure. Bi-directional thyristor volt-ampere characteristic curve Since the forward and reverse characteristics of the bidirectional thyristor are symmetrical, it can be turned on in any direction and is an ideal AC switching device.