Test whether the electrical equipment on the aircraft will work normally under different voltage conditions.

A variety of different functions and types of electrical equipment are responsible for the normal operation of aircraft, aircraft, satellites and other equipment, contributing to the rapid development of the aerospace industry. For the development, production and testing of these electrical equipment, a number of tests are required to ensure. Test items for a powered device include: reliability test, functional test, protection action test, electromagnetic interference test, etc. A considerable part of this relies on high-precision, high-performance programmable DC power supplies.

Programmable DC Power Supply is mainly used in the aerospace industry for the testing of DC-DC power modules, batteries, flight simulators and other DC power equipment. Reliability testing The reliability testing of electrical equipment usually includes voltage drop test, temperature rise test, ON/OFF test, aging test, and the like. For aerospace electrical equipment, it is necessary to carry out more stringent tests than conventional ones, requiring electrical equipment not only to work stably under normal power supply conditions, but also to cope with abnormal power supply conditions.

For example, on an airplane, the power supply system supplies power to a variety of DC power equipment, and the power supply system on the aircraft sometimes has an overvoltage or undervoltage condition, ensuring that the power equipment works normally under these abnormal conditions. Guarantee of aircraft functionality and safety. Therefore, overvoltage and undervoltage testing is essential. The DC power supply is used to simulate the power supply system in this test. It simulates the voltage change of the aircraft power supply system by outputting a continuous voltage change waveform, and supplies power to the power equipment to test whether the power equipment will be overvoltage, undervoltage, and normal. The voltage can maintain normal operation under three different voltage conditions. Figure 1 is a simulation of the voltage waveform output from the aircraft power supply system using a DC power supply when an undervoltage test is performed on the electrical equipment on the aircraft:

figure 1

Many aircraft's power supply system is 28V power supply. Therefore, the DC power output waveform is 28V for 5min, 50V overvoltage for 50ms, normal voltage for 10s, 0V for undervoltage 7s, normal voltage for 10s, and loop test for 3 times. This waveform needs to be edited and output by the DC power supply with programming capability, and the List function of the programmable DC power supply series of ITECH is designed. When engineers edit the waveform, they only need to set the voltage value and time value through the numeric buttons of the panel. The editing of the waveform is more simplified. In addition to the programmable features, in order to complete this test, the DC power supply must also have high-speed characteristics and fast voltage climb time. Otherwise, the voltage change cannot be performed in a very short time, and it cannot be simulated. The working state of the power supply system on the aircraft. For example, in the voltage waveform shown in Figure 1, the voltage rises from 28V to 50V, and only drops to 28V for 50ms. The voltage rise time of a typical DC power supply is about 150ms. If the power is not fast enough, it will output. What kind of voltage waveform? as shown in picture 2.

Figure 2 is not difficult to find from the comparison between Figure 2 and Figure 1. The voltage rise/fall time of the general power supply is slow, and the test required waveform is not achieved. And the voltage rise time of the ADK programmable DC power supply can reach