1 repeated short circuit test
Test instruction
The module output should be short-circuited under various input and output states. The module should be able to protect or retract, and repeatedly short-circuit. After the fault is removed, the module should automatically resume normal operation.
Test Methods:
A. No-load to short-circuit: In the full range of input voltage, the module should be able to realize output current limiting or retraction from no-load to short-circuit. After the short-circuit is removed, the module should be able to resume normal operation. Let the module repeatedly work from no load to short circuit, the short circuit time is 1s, the release time is 1s, and the duration is 2 hours. After this, the short circuit is released and it is judged whether the module can work normally.
B. Full load to short circuit: In the full range of input voltage, the module should be able to realize output current limiting or retraction from full load to short circuit. After short circuit elimination, the module should be able to resume normal operation. Let the module go from full load to short circuit and then keep short circuit for 2 hours. Then short out and let go, judge whether the module can work normally.
C. Short-circuit start-up: short-circuit the output of the module, then go on the power, and then power on 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 removed, the module should be able to resume normal operation. After repeating the above test 10 times, let the short circuit go out and judge whether the module can work normally.
judgement standard:
After the above test, the power module can be turned on normally; the boot case is checked, the circuit board and other parts are free of abnormal phenomena (such as whether the input relay is stuck during the short circuit, etc.), and it is qualified; otherwise it is unqualified.
2 repeated switch test
Test instruction:
When the power module output has the maximum load, the input voltage is 220V, (input overvoltage point -5V) and (input undervoltage point +5V), the input is repeatedly switched, and the performance of the power module is repeatedly turned on and off.
Test Methods:
A, the input voltage is 220V, the power module is fast with the maximum load, use the contactor to control the voltage input, 15s, disconnected for 5s (or can be simulated with AC SOURCE), continuous operation for 2 hours, the power module should work normally;
B, the input voltage is overvoltage point -5V, the power module has the maximum load, use the contactor to control the voltage input, 15s, disconnected for 5s (or can be simulated with AC SOURCE), continuous operation for 2 hours, the power module should be normal jobs;
C, the input voltage is undervoltage point -5V, the power module has the maximum load, use the contactor to control the voltage input, 15s, disconnected for 5s (or can be simulated with AC SOURCE), continuous operation for 2 hours, the power module should be normal jobs.
Judging criteria:
In the above test, the power module works normally. After the test, the power module can work normally, the performance has no obvious change, and it is qualified; otherwise it is unqualified.
3 input low pressure point cycle test
Test instruction:
The setting hysteresis of the input undervoltage protection of the primary power module often occurs as follows: the input voltage is low, close to the undervoltage point of the power module, and the undervoltage at the time of loading, after the disconnection, the load is unloaded due to the internal resistance of the power supply. The voltage will rise after the drop, which may cause the power module to be repeatedly developed at low voltage.
Test Methods:
The power module is running at full load. The input voltage changes slowly from (input undervoltage point -3V) to (input undervoltage point +3V). The time is set to 5~8 minutes. Repeated cycle operation, the power module should be able to work normally and continuously. At least 0.5 hours, there is no significant change in the performance of the power module.
judgement standard:
Once the power module is in normal continuous operation, the performance does not change significantly after at least 0.5 hours, and it is qualified; otherwise it is unqualified.
4 input transient high voltage test
Test instruction:
The PFC circuit uses the averaging circuit for over-voltage protection. Therefore, when inputting transient high voltage, the PFC circuit may be protected quickly, causing damage. Test the stability of the power module under transient conditions to evaluate reliability. .
Test Methods:
A. Rated voltage input, test the input voltage waveform and overvoltage protection signal with dual trace oscilloscope. The input voltage is changed from 5V to 300V from the limit power point. Read the number of cycles of 300V before the overvoltage protection from the oscilloscope, as the following. Basis for the test.
B, rated input voltage, power module with full load operation, superimposed 300V voltage jump on the input, the number of superimposed cycles is (n-1), the superimposed frequency is 1 time / 30s, a total of 3 hours.
judgement standard:
The primary power module can operate stably under the above conditions without any damage or other abnormalities; otherwise it is unqualified.
5 input voltage drop and output dynamic load
Test instruction:
During the actual use of the module, when the input voltage drops, the limit of the sudden load of the power module may occur. At this time, the power device and the magnetic component operate in the maximum transient current state, and the test can verify the control timing and current limit. The rationality of protection circuit and software design.
Test Methods:
A. Adjust the input voltage to jump between +5V undervoltage (5s duration) and -5V overvoltage (5s duration). Output is adjusted at maximum load (maximum rated capacity, duration is 500ms) Jump between no-load (with a duration of 500ms) and run for 1 hour;
B. Adjust the input voltage to between +5V undervoltage (duration 5s) and overvoltage point -5V (duration 5s). The output is adjusted at the maximum load (maximum rated capacity, duration is 1s). Jump between no-load (with a duration of 500ms) and run for 1 hour.
judgement standard:
Under the above conditions, it should be able to operate stably without damage or other abnormal phenomena; otherwise it is unqualified. In the event of damage, record the problem to provide a basis for analyzing the cause of the damage.
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