1 Scope
This document specifies the - general requirements, test items and test methods for the testing of computer power supplies for aerospace scalable architectures.
This document applies to the testing of aerospace scalable architecture computer power supplies (hereinafter referred to as power supplies), and other power supplies may refer to the implementation.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the corresponding version of the eight issues apply to this document; do not note the date of the reference document, its latest version (including all the revision of the list) applies to this document.
GB/T 6995.2- 2008 Wires Cable identification marking methods Part 2: Standard colours
GB/T 9254 Radio disturbance limits and measurement methods for information technology equipment
GB/T 17618 Limits and methods of measurement for immunity of information technology equipment
GB 17625.1 Electromagnetic compatibility limits Harmonic current emission limits (input current per phase of equipment ≤ 16 A)
GB 50611- -2010 Code of practice for the design of electronic engineering against static electricity
3 Terminology and definitions
The following terms and definitions apply to this document.
3.1
Voltage regulation
The relative change in output voltage due to a change in input voltage when other influencing quantities are held constant.
3.2
load regulation
The relative change in output voltage due to a change in load, with all other influences held constant.
3.3
Rise time
The time taken for the output voltage to rise from 10% to 90% of the nominal voltage.
3.4
enable signal
enable signal
The switch signal of the computer-controlled power supply is disabled when it is high or suspended (except when the specified auxiliary power supply has an output), and low for the power supply to work.
3.5
Ready signal
power good signal
A power ready signal is sent to the computer CPU when the power supply is working properly.
3.6 power factor
power factor
The ratio of active power to apparent power.
4 Test preparation
4.1 Test equipment
4.1.1 Test equipment composition
Test equipment consists of common test equipment, analog load test cables, etc., which:
a) General test equipment including high-power DC (AC) power supply, digital multimeter. Oscilloscope. Current clamp (including current amplifier), insulation resistance meter, voltage tester, power factor meter, etc.; analog load including electronic load, sliding resistor, etc.. If sliding resistors are used, external voltage and current detection equipment (instruments) should be connected.
b) The test cable includes a device to connect the power supply to the simulated load of the common test equipment.
4.1.2 Test equipment requirements
All test instruments, equipment, measuring tools (see Table 1), etc., should be qualified by the most test and within the validity period, the most range, accuracy should meet the basic performance indicators required in Table 1 test requirements.
4.2 Test site
Test site should meet the following requirements:
a) The test site includes the test bench and the surrounding personnel activity space.
b) The test bench shall be level. The inside of the test bench shall be provided with a regulated 220 V AC power outlet, with the earth wire connected to a large
The test bench is provided with a regulated 220 V AC power socket on the inside, where the ground is reliably connected to the mains. The test bench is antistatic in accordance with the requirements of GB 50611-2010.
4.3 Test environment conditions
4.3.1 Standard atmospheric conditions
Unless otherwise specified, all tests shall be carried out under the following ambient conditions:
a) Ambient temperature: 15 C~35 C;
b) Ambient relative humidity: 25 % to 75 %;
c) Atmospheric pressure: 86 kPa~106 kPa.
4.3.2 Criteria for arbitration tests Atmospheric conditions
If the parameters to be measured are dependent on temperature, humidity and air pressure and this dependence is unknown, measurements and tests may be carried out under the following standard atmospheric conditions for the arbitration test:
a) Ambient temperature: 25 C to 1 C;
b) Ambient relative humidity: 48% to 52%;
c) Atmospheric pressure: 86 kPa to 106 kPa.
4.4 Testers
The test personnel shall meet the following requirements:
a) The test operator shall be trained to be proficient in the use of all relevant test equipment. The test operator shall be trained in the use of the relevant test equipment and shall have a good understanding of the various test items and data interpretation guidelines;
b) Testers should be prepared before the test; wear anti-static clothing and anti-static shoes, hats, anti-static gloves and anti-static wristbands, and make the plug of the anti-static wristband and the anti-static wristband socket on the workbench contact reliable.
5 test items
Power supply test items are shown in Table 2.
6 Test method
6.1 Input voltage range (Vm)
6.1.1 Purpose
To test the output current and output voltage of the power supply that can be stabilised within the specified range of the input terminal voltage range after start-up. The two limits of the input power supply range VNmb.VNux, where Vnm is the minimum input voltage specified in the product specification and VNuwx is the maximum input voltage specified in the product specification.
6.1.2 Test principle circle
The test schematic is shown in Figure 1.
6.2 Input inrush current (Imm)
6.2.1 Purpose
To test the magnitude of the transient spike current flowing at the input when the power supply is instantaneously connected to the supply.
6.2.2 Test Principle Group
The test schematic is shown in Figure 2.
6.3 Input reflected voltage ripple (Vur)
6.3.1 Purpose
To test the peak value of the reflected voltage ripple at the power supply input port.
6.3.2 Test schematic
The test schematic is shown in Figure 3.
6.4 Input reflected current ripple (Ium)
6.4.1 Purpose
To test the peak value of the reflected current ripple at the power supply input port.
6.4.2 Test schematic
The test schematic is shown in Figure 2.
6.4.3 Test conditions
The following test conditions shall be specified:
a) Ambient temperature (Ts) [or case temperature (Tc)];
b) Input voltage (Vn);
c) Output voltage (Uo);
d) Output current (Io);
e) Oscilloscope test bandwidth;
f) state of the enable signal.
6.4.4 Test procedure :
6.5 Input undervoltage (Vnu)
6.5.1 Purpose
To test the ability of the power supply to protect against a voltage (Vw) at the input side falling below a specified value. The test items include the input undervoltage turn-on voltage (VrooN), the input undervoltage turn-off voltage (VxuLo) and the input undervoltage return voltage (Vvnxum).
6.5.2 Testing Principle diagram
The test schematic for the transmitter undervoltage protection function is shown in Figure 1.
6.5.3 Test conditions
6.6 Output voltage (Uo)
6.6.1 Purpose
To test the voltage amplitude at the output of the power supply.
6.6.2 Test principle diagram
The test schematic is shown in Figure 1.
6.6.3 Test conditions
The following test conditions shall be specified:
a) Ambient temperature (Tn) [or case temperature (Tc)];
b) Input voltage (Vn);
c) Output current (Io) ;
d) state of the enable signal.
6.6.4 Test procedure
The test procedure is specified as follows:
a) Connect the power supply, test cable and load according to Figure 1;
b) Set the input voltage to the specified value and adjust the load. Adjust the load so that the output current (Io) of each circuit is the specified value;
c) Turn on the power supply, add the specified input voltage (Vn) to the input side of the power supply under test, and test the output voltage (Uo) with a digital multimeter.
6.6.5 Notes
The output voltage test is based on the voltage at the root of the lead end, for the test process of the long line lead out of the tooling, test at the test end of the load tooling.
6.6.6 Test data recording and processing
The test data record table is shown in Table A.1 and the output voltage amplitude meets the requirements of the detailed product specification.
6.7 Output current (Io)
6.7.1 Purpose
To test the current flowing to the load at each output of the power supply.
6.7.2 Test schematic
The test schematic is shown in Figure 1.
6.8 Output Power (Po)
6.8.1 Purpose
To test the total power flowing to the load from each output of the power supply.
6.8.2 Test schematic
The test schematic is shown in Figure 1.
6.8.3 Test conditions
6.9 Output voltage ripple (Uw)
6.9.1 Purpose
To test the peak-to-peak value of the AC component contained in the output voltage of each circuit of the power supply.
6.9.2 Test Principle Group
The test schematic is shown in Figure 4.
6.10 Output voltage build-up time (Tu)
6.10.1 Purpose
To test the rise time of the output voltage of each circuit when the power supply is started at the specified input voltage or when the enable signal enables the start.
6.10.2 Test principle Diagram
The test principle is shown in Figure 5.
6.11 Power-up Timing:
6.11.1 Purpose
To test the start-up timing between the various outputs of the power supply.
6.11.2 Test schematic
The test schematic is shown in Figure 5.
6.11.3 Test conditions .
Foreword
1 Scope
2 Normative references
3Terms and definitions
4Test preparation
5 Test items
6 Test methods
Annex A (Informative) Power Supply Test Data Reference Record Requirements
