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Power supply reliability test

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2022-09-30 15:25

01 Repeated short circuit test
Test description: when the module output is short circuited under various input and output states, the module shall be able to achieve protection or retraction. The module shall be short circuited repeatedly. After the fault is eliminated, the module shall be able to automatically resume normal operation.
Test method:
a. No load to short circuit: within the full range of input voltage, from no load to short circuit, the module shall be able to realize output current limiting or retraction normally. After the short circuit is eliminated, the module shall be able to resume normal operation. Let the module work repeatedly from no load to short circuit. The short circuit time is 1s, the release time is 1s, and the duration is 2 hours. After that, release the short circuit to judge whether the module can work normally;
b. Full load to short circuit: within the full range of input voltage, the module shall be able to realize output current limiting or retracting normally from full load to short circuit. After the short circuit is eliminated, the module shall be able to resume normal operation. Allow the module to be short circuited from full load for 2 hours. Then release the short circuit to judge whether the module can work normally;
c. Short circuit startup: short circuit the output of the module first, then energize it, and then energize it within the input voltage range of the module. The module should be able to achieve normal current limiting or retraction. After the short circuit fault is eliminated, the module should be able to resume normal operation. After repeating the above test for 10 times, let the short circuit release to judge whether the module can work normally.
Criteria:
After the above tests, the power module can work normally when it is turned on; Check the power on case, the circuit board and other parts are free of abnormal phenomena (such as whether the input relay is stuck by electric shock during short circuit), and it is acceptable; Otherwise, it is unqualified.
02 Repeated on/off test
Test description: when the output of the power module is with the maximum load and the input voltage is 220v respectively, input the switch repeatedly under the conditions of (input overvoltage point - 5v) and (input undervoltage point+5v), and test the performance of the power module to switch repeatedly.
Test method:
a. The input voltage is 220v, the power module quickly carries the maximum load, uses the contactor to control the voltage input, closes for 15s, disconnects for 5s (or can be simulated with ac source), and runs continuously for 2 hours. The power module should be able to work normally;
B. The input voltage is overvoltage point - 5v, the power module carries the maximum load, the voltage input is controlled by the contactor, the voltage is closed for 15s, the voltage is disconnected for 5s (or it can be simulated by ac source), and the power module can work normally after 2 hours of continuous operation;
c. The input voltage is - 5v at the undervoltage point. The power module carries the maximum load. The contactor is used to control the voltage input, which is closed for 15s and disconnected for 5s (or can be simulated with ac source). The power module shall be able to work normally after 2 hours of continuous operation.
Criteria:
In the above tests, the power module works normally. After the test, the power module can work normally without obvious changes in performance, so it is qualified; Otherwise, it is unqualified.
03 Input low voltage point cycle test
Test description: the setting error of the input undervoltage point protection of the primary power supply module often occurs in the following situations: the input voltage is low, close to the undervoltage point of the primary power supply module, undervoltage when loaded, and after disconnection, due to the internal resistance of the power supply, the voltage will rise after the load is removed, which may cause the primary power supply module to be in the state of repeated development at low voltage.
Test method:
The power module operates with full load. The input voltage changes slowly from (input undervoltage point - 3v) to (input undervoltage point+3v). The time is set to 5 to 8 minutes. The power module operates repeatedly. The power module should be able to work normally and stably. The continuous operation should last at least 0.5 hours. The performance of the power module does not change significantly.
Criteria:
The primary power supply module operates normally and continuously, and there is no obvious change in performance after at least 0.5 hour, so it is qualified; Otherwise, it is unqualified.
04 Input transient high voltage test
Test description: the average value circuit is used for overvoltage and undervoltage protection in the pfc circuit, so when the transient high voltage is input, the pfc circuit may achieve protection quickly, thus causing damage. Test the stable operation ability of the primary power module under the transient condition to evaluate the reliability.
Test method:
a. For rated voltage input, use a dual trace oscilloscope to test the input voltage waveform and overvoltage protection signal. The input voltage jumps from 5v at the power limiting point to 300v. Read the cycle number n of 300v before overvoltage protection from the oscilloscope as the basis for the following tests:;
b. Rated input voltage, the power module operates with full load, superimposes 300v voltage jump on the input, the superimposed cycle number is (n-1), the superimposed frequency is once/30s, and the total operation time is 3 hours.
Criteria:
The primary power supply module can operate stably under the above conditions without damage or other abnormal phenomena, acceptable; Otherwise, it is unqualified.
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