Digital software technology has been widely used in switching power supplies that used to be dominated by analog technology. LED lighting, automotive power supplies, and industrial equipment have also begun to introduce digitally controlled power supplies. By adding communication functions or changing control methods to dynamic control, it has been effective in improving power efficiency, reducing product size, and shortening development time. It has long been a high cost issue for DSP projects, and it has gradually been resolved with the introduction of low-priced products like the price of general-purpose microcontrollers. The digital control of the power supply contributes to miniaturization and high efficiency of AC-DC power supplies and DC-DC converters, and has received attention about five years ago. The application range of this "digital power supply" has quietly expanded in the past year. Previously, digital power was only introduced into some of the infrastructure of uninterruptible power supply units (UPS), communications products, servers, and power conditioners for solar cells. Recently, however, LED lighting, automobiles, industrial equipment, and even some consumer products have begun to use digital power (Figure 1). The debut of the low-cost DSP became an opportunity The main reason why the range of applications of digital power can be expanded is that power control ICs with a unit price of only 100 yen to several hundred yen have appeared for digital power supplies. The cost of the digital power control IC has dropped to an extent comparable to an analog power control IC of less than 100 yen. Semiconductor manufacturers such as Microchip Technology, Texas Instruments, and Nippon Wireless have introduced low-cost control ICs for digital power supplies from around 2008. Recently, most digital power products use ICs from these companies. In the past, a high-performance DSP with a unit price of up to 1,000 to several thousand yen was used as a control IC for constituting a digital power supply. These ICs operate at frequencies above 100 MHz, and the power consumption is only 1 W for the DSP. The control for the normal switching power supply is excessive. This is the main reason why digital power supplies using DSP are only used on large devices such as UPSs that exceed 1 kW. However, at the request of some advanced power supply manufacturers, Microchip Technology and TI have introduced the DSP with the functions required for digital power supply, which is as cheap as the general-purpose microcontroller, that is, the "DSP microcontroller" (1). By reducing the cost of DSPs of 1,000 yen or more to hundreds of yen or less, the biggest bottleneck of digital power is basically solved - the problem of high control IC cost. (1) DSP microcontroller = a product formed by fusing DSP elements in a common general-purpose microcontroller. It is characterized by hardware implementation of Harvard Architecture and loop control functions. About 10 years ago, semiconductor manufacturers in Japan and abroad began to put DSP microcontrollers. Fiber Optic Adapter / Fiber Optic Coupler Fiber To Ethernet Converter,Optical To Ethernet Converter,Optical Fiber To Ethernet Converter,Fiber Optic To Ethernet Converter Price Ningbo Fengwei Communication Technology Co., Ltd , https://www.fengweicommunication.com
Figure 1: Application areas for digitally controlled power supplies
In the field of output power of 100 W or more and switching frequency of 1 MHz or less, digital control power supplies using DSP microcontrollers have begun to spread.
Figure 2: Benefits of importing digital power
There are many benefits in the areas of power supply performance, development, and operation, such as reducing product size, reducing part count, and increasing efficiency by introducing height control.