DC stabilized power supply is widely used in electronic product production lines, laboratories, industrial control and information communication. Its output voltage quality directly affects the performance of the entire system. In the course of daily use. There are two main factors that cause changes in the output voltage: one is caused by a change in the upstream input voltage; the other is caused by a change in the output current (due to load changes). In general, the power supply has to consider the two factors of input voltage and load. That is to say, the ability of the DC stabilized power supply to stabilize the voltage depends first on how much the change in the input voltage and the change in the output voltage caused by the load change are limited. An indicator that measures this level is generally referred to as a quality indicator. This paper proposes a design scheme of DC power supply automatic test system based on FPGA, high-speed A/D, D/A and host computer software, which can realize the parameters of the above aspects of DC power supply. In the brief introduction to the system's composition, function, working principle and the main components used. Focus on the implementation of system hardware and software. The main test object of the system is the rated output voltage of up to 30V. Low-power DC regulated power supply with rated output current up to 1OA. The system design is strictly in accordance with relevant national standards. The main features of the system include: The working principle of the system is: the upper computer sends the configuration data to the data acquisition conversion and control module through the parallel interface; the module first performs self-test, and if the self-test is correct, the system will start the automatic test according to the already set process. At the same time, the output voltage and current of the tested power supply are collected in real time, and converted into digital transmission to the upper computer; after the test is completed. The host computer analyzes and calculates the test data and automatically generates a test report. And establish a test database of the tested power supply. The structural block diagram of the DC stabilized power supply automatic test system is shown in Figure 1. The system consists of a host computer, a data acquisition conversion and control module, a source voltage adjustment device, and an analog load. among them. The upper computer is the information and task scheduling center of the system, which mainly completes the functions of system management, test program generation, test control and test result analysis. And can display the test process and test results. Data acquisition conversion and control module Figure 1 Hi-flow regulated power supply automatic test system structure block diagram is mainly composed of FPGA, CPLD and its peripheral circuits, A / D conversion circuit, D / A conversion circuit, signal conditioning circuit and various interface circuits. The block diagram of the system structure of this module is shown in Figure 2. 3.1.1 XC2S100-TQ144 FPGA chip Among them, CLB is used to implement most of the logic functions of the FPGA; 1OB is used to provide the interface between the package pins and internal logic; BIockRAM is used to implement random access inside the FPGA, which can be configured as RAM, dual-port RAM, Random memory such as FIFO; DLL is used to provide flexible clock management functions. Spartan-II series FPGA is based on RAM technology. After the power is turned off, the information cannot be saved by itself, and an external memory chip is needed to save the information. A XC95144XL CPLD can be used instead of a cost-effective dedicated PROM. In addition, the CPLD has a level shifting function here. After the module is powered on. The CPLD configures the data to be loaded into the internal static storage unit of the FPGA to complete the customization of the FPGA. The configuration data stored in these units determines the logic functions and interconnections in the FPGA. COB Light
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It mainly includes the following parameters:
(1) voltage adjustment rate SD;
(2) load adjustment rate St;
(3) output resistance Ro;
(4) ripple coefficient y;
(5) Recovery time Δt;
(6) Peak voltage UP.
(1) Object function test: The system can provide a virtual working environment (including input power and analog load) for the tested power supply to work normally, and can complete the help machine test in the environment;
(2) System management: The system can automatically generate test programs according to test requirements and control the test automatically, and finally give the test report automatically:
(3) Database management: Manage data with a relational database management system. The data of the configuration database is read by the test flow. Bone testing equipment. Perform the appropriate tests and save the test results to the test results database:
(4) Simulation display: The system has an interactive graphic display interface, which can display real-time display of test program generation, test flow, prompt information during test, real-time data generated, test results, etc., and can provide alarm information. 
The Spartan-II series XC2S100-TQ144 FPGA is produced by Xilinx, USA, which provides users with good performance, a large number of logic resources and rich feature set. Its core voltage is 2.5V, the logic gate density is 100000 system gates, the number of user IO is 92, it supports the operating frequency above 200MHz, the internal structure is mainly composed of configurable logic module (CLB), user programmable I/O ( IOB), BIockRAM, digital delay phase-locked loop (DLL).
Design of an automatic test system for DC stabilized power supply
1. introduction