Overview: This paper introduces a digitally controlled DC stabilized power supply with high adjustment accuracy and easy operation. The AVR series MCU Atmega8 is used as the main control unit to set the output voltage of the D/A converter chip MAX522 through different digital inputs. The DAC output voltage is amplified by voltage and current through a two-stage op amp circuit composed of μA741 and an emitter outputter ZTX453. The 5.12V reference voltage for the DAC input is generated by the LM366 integrated regulator. The host computer communicates with the lower computer through the VUSB technology unique to the AVR microcontroller, and introduces the implementation of the USB device driver under the Windows platform. This voltage source realizes the visibility and controllability of voltage value reading and setting, and can be used as an embedded power module for some test equipment. The system composition framework is shown in Figure 1. It consists of 8 serial input DACMAX522, regulated output circuit, VUSB interface circuit, signal conditioning circuit, single-chip Atmega8 and other peripheral components. It can output 0~12V voltage, step accuracy. It is 0.1V and the current can reach 2A. At the same time, the output voltage value can be set by the host computer. Figure 1 Numerical control DC regulator source composition More about Atmega8: Integrated Circuit Query Network http:// (Please read the PDF for details) Laser Barcode Scanners,Laser Barcode Reader,Ls2208 Barcode Scanner,Laser Barcode Scanner Price Guangzhou Winson Information Technology Co., Ltd. , https://www.barcodescanner-2d.com
The digitally controlled DC stabilized power supply is one of the commonly used devices in electronic technology. Most of the current use of the rotary switch is to adjust the voltage value, the adjustment accuracy is not high, and often jumps, it is extremely inconvenient to use. The digitally controlled DC stabilized power supply sets the digital input to the DAC through the upper computer, and outputs the adjustable step voltage. The upper computer and the lower computer communicate through a software-simulated USB. Traditional MCU and computer USB communication requires a dedicated interface chip for USB protocol conversion, such as CP2101, FT232, CH342, PDIUSBD12, SL811, etc. Chips such as CP2101 and FT232 are simple to use, but their functions are relatively simple. PDIUSBD12 and SL811 are more powerful, but they are complicated to use. And the price of these dedicated chips is relatively high, increasing the cost of the system. VUSB is easy to use, low cost, and requires only a common low-cost AVR microcontroller and few external components to form a USB system. 
More about the MAX522 data: IC query network http://