1 input voltage range and over/under voltage point, and half load switching point
Test instruction:
AC input (single-phase) telephone range: within the range of 85% to 110% of the rated value should be able to work normally; AC 380V input (three-phase) variation range: within the range of 85% to 110% of the rated value should be able to work normally.
When the input is 85% and 110% of the rated value, the full load should be able to start full load: that is, the input over/under voltage recovery point should be set outside the rated value of 85% to 110% (or within the given input voltage range) Outside).
For our primary power supply products, the input voltage range of the module is specified between the undervoltage protection point and the overvoltage protection point. At the lower limit of the input voltage range, the module is not required to start.
For the three-phase module, when the overvoltage protection point is overvoltage protection, the voltage value of the highest phase of the three-phase voltage is the lowest one-phase voltage value of the three-phase voltage when the undervoltage protection point is the module undervoltage protection. Note: This range should be the basic indicator (electric power supply: DL/T 781; communication power supply: YD/T 731 standard). The specific scope is subject to the specifications and enterprise standards.
Test Methods:
Use a pure voltage source (generally requires the power supply distortion not to exceed 5%, AC SOURE can be used as a pure voltage source), adjust the AC input voltage to 220V, let the module start and work normally.
Under the rated output minimum load, adjust the AC input voltage to gradually increase until the module input overvoltage alarm is turned off, record the voltage value as the overvoltage protection point; adjust the AC input voltage to gradually reduce it until the module is restarted. Normal work (Note: Because the module needs to be restored when working, in order to accurately find the recovery point, when the input voltage is close to the recovery point, a smaller step size is required to adjust the input voltage, and each time a value needs to be adjusted For a certain period of time, to determine whether the module is restored, record this value as the AC input overvoltage recovery point.
Under the rated output full load, adjust the AC input voltage to gradually decrease until the module output undervoltage alarm is turned off, record the voltage value as the undervoltage protection point; then adjust the AC input voltage and gradually increase the input voltage until the module is restarted normally. Work (Note: Because the module needs to be restored when working, in order to accurately find the recovery point, when the input voltage is close to the recovery point, a smaller step size is required to adjust the input voltage, and each time a value needs to be adjusted, a certain delay is required. Time, to determine whether the module is restored), record this value as the AC input undervoltage recovery point.
Note: For the limited power module, the test module inputs the undervoltage point at the rated output half load.
First let the module work normally with full load under the rated input condition, adjust the input voltage, and gradually reduce it until the module limits the power output (usually the half-load current-limit output), and record the input voltage at this time as the half-load switching point. Then adjust the input voltage to gradually increase until the module can return to the full load output, recording the input voltage at this time as a half-load conversion recovery point.
Judging criteria:
Compliance with the test instructions, qualified; otherwise unqualified.
2 load effect, source effect and voltage regulation accuracy
Test instruction:
Load effect: The AC input voltage is the rated input voltage because the output voltage fluctuation caused by changing the load does not exceed ±0.5% of the output voltage setting value.
Source effect: In the case of rated output current (rated load), the input voltage changes (within the input voltage range that allows full-load output) cause fluctuations in the output voltage, and the required voltage regulation rate does not exceed ±0.1%.
Voltage regulation accuracy: Different AC input voltage and load are combined. In each case, the error between the DC output voltage and the output voltage setting value should not exceed ±0.6% of the output voltage setting value (for a 24V output module, the requirement cannot exceed ±1% of the output voltage setting value).
This standard is the basic indicator (731 standard) that should be met. The specific scope is based on the specification and the enterprise standard.
Test method : The input voltage is rated, the output current is changed from 5% to 100%, the output voltage V1 at 5% load, the output voltage V0 at 50% load, and the output voltage V2 at 100% load are recorded.
Calculate the larger of (V2-V0)/V0, (V0-V1)/V0.
Source effect:
Adjust the output current to make the module full load output; adjust the input voltage to change within the full input voltage range, record the output voltage V0 at the rated input, the output voltage V1 at the lower limit input voltage, and the output voltage V2 at the upper limit input voltage.
Calculate the larger of (V2-V0)/V0, (V0-V1)/V0.
For ultra-wide voltage modules, the input voltage is limited to the input voltage of the system overvoltage protection point and the low-voltage input start limit power point of the test.
Voltage regulation accuracy:
Measure the rated input voltage and the half-load setting voltage V0, and input the voltage at the maximum input voltage to the highest input voltage when the rated value changes, and the load current changes within the range of 5% to 100% to determine the maximum deviation of the output (relative to the set voltage) Value V1; Calculate (V1-V0)/V0, which is the regulation accuracy.
Note: In order to improve the test efficiency, the voltage regulation accuracy, load effect and source effect can be tested together. When testing, the relevant quantities are tested according to the test table of the appendix, and finally calculated according to the respective calculation methods.
judgement standard:
Compliance with the test instructions, qualified; otherwise unqualified.
3 output voltage range and output over-voltage point
Test instruction:
In the case of rated input voltage and various load outputs, the output voltage is separately adjusted, and the voltage adjustment range of the output is measured (for the software-regulated module, it can be adjusted by the monitoring unit. For non-software-adjusted modules, it can be adjusted by floating The trimming resistance of the charging voltage is adjusted).
In the case of rated input voltage and no-load output, the output under-voltage alarm point, under-voltage alarm recovery point and output over-voltage point are measured. The module should be able to lock the output when the output is overvoltage.
Specific indicators can be found in the specification or enterprise requirements.
Test Methods:
Output voltage range:
Adjust the input voltage to the lower limit (for the limited power module, the lower limit of the full power input voltage), adjust the output current to the rated output current, adjust the output voltage, and record the output current as the rated value. The highest output voltage is DC. The upper limit of the output voltage;
Adjust the input voltage to the upper limit, adjust the output current to 5% of the rated current, adjust the output voltage, and record the minimum output voltage when the output current is 5% of the rated value is the lower limit of the output voltage.
Output overvoltage point:
Adjust the input voltage to the rated value, adjust the output to no load, and adjust the output voltage until the module output undervoltage alarm occurs. The output voltage at this time is the output undervoltage point. Then adjust the output voltage so that it slowly increases until the module's undervoltage alarm disappears, and the output voltage point at this time is the undervoltage recovery point. (Note: Most of the company's modules currently have no output undervoltage protection)
Adjust the input voltage to the rated value, adjust the output to no load, connect the diode with the adjustable voltage source to the output of the module (the diode is used to prevent the voltage of the module from being reversed to the DC voltage source and the DC voltage source is damaged), and adjust the DC voltage. The source increases its voltage until the module outputs an overvoltage shutdown. At this time, the voltage at the output of the module is the output overvoltage point. (Note: The output of the DC voltage source is not the output overvoltage point of the module.) After overvoltage, turn off the DC voltage source and observe whether the module can recover automatically. If the module cannot automatically return to normal, turn off the AC power and let all the modules display. Turn off, then power cycle again to see if the module is working properly.
judgement standard:
Compliance with the test instructions, qualified; otherwise unqualified.
4 Starting surge current
The starting heavy boundary current refers to the current that the grid charges the module input capacitor when starting the machine. In some cases, the spike current caused by the X and Y capacitors has a narrow pulse width (generally less than 0.5 ms) and is not recorded as an inrush current.
In the rated input voltage, the output voltage is the upper limit of the floating charge, and the full load output, the input starting impulse current is measured, and the input starting impulse current peak value is required to be 150% of the maximum steady-state input current RMS value under the rated input condition.
Specific indicators can be found in the specifications and enterprise requirements.
Test Methods:
In the rated input voltage, the output voltage is the upper limit of the floating charge, and the output current is measured at the full load output. The current probe and the trigger function of the oscilloscope are used to measure the input surge current, at least 5 times, and the lowest. Once as a test result.
judgement standard:
Compliance with the test instructions, qualified; otherwise unqualified.
5 switch overshoot
Test instruction:
Input full voltage range, under various load conditions, it is required to switch the overshoot voltage amplitude ≤ ±10% of the output setting voltage value.
Specific indicators can be found in the specifications and corporate requirements.
Test Methods:
In the input full voltage range, output various load conditions (select the lowest input voltage, the highest input voltage and rated input voltage and 5% load, 50% load and 100% load of various combinations of conditions), open before the module As a switch, the oscilloscope trigger function is used to measure the overshoot waveform of the output voltage at power-on and the overshoot waveform at shutdown. Then use the oscilloscope's measurement function (measer->select measure-"overshot) to directly read the overshoot amplitude of the switch, and the overshoot amplitude of the switch must not exceed ±10% of the output set voltage value.
judgement standard:
Compliance with the test instructions, qualified; otherwise unqualified.
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