subject: Static Test Technique And Its Application In Led Upgrade [print this page] As the comparison of blue led strip large screen applications, LED the enterprise of grain quality of downstream to upstream are more stringent, who LED resistance to electrostatic test voltage values from the original 4kV requirements, up to 8kV gradually, to tolerate bad outdoor environment.
All the major design points to consider are as follows:
1. test probe assembly design part
Insulation design are LED Bulbs divided into divided into internal and external insulation in two categories. Internal insulation inside the module. Includes solid dielectric insulation and composite insulation made of different media. Although external atmospheric conditions effect on the insulation failed, but the aging of materials, high-temperature, continuous heat and moisture, and other factors have a negative effect on the dielectric strength of insulating and insulation breakdown occurs, dielectric strength it cannot recover on their own. External insulation means working in direct contact with atmospheric conditions, the formation of different forms of insulation, including the exposed surface of the solid insulation of air gap and modules. Outstanding feature of external insulation is after the discharge has stopped, its dielectric strength normally can quickly recover fully, and is independent of the number of repeated discharge. Patrons insulated of insulated strength and external atmospheric conditions is closely related to, will by atmospheric temperature, and pressure, and humidity, multiple factors of effect; to atmospheric for cases, General atmospheric in the of insulated strength about 30kV/cm, has drops exists Shi about for 10kV/cm, temperature by at room temperature rose to Celsius 100 of Shi, insulated strength drop for 80%, so design Shang will by temperature humidity caused estimates material insulated strength changes range, and to this design resistance pressure by needed retained of security spacing.
Sonde insulation dielectric strength test to determine. Tests include and breakdown voltage test test two. Withstand voltage test is to try to impose a certain voltage, over a period of time, to breakdown test qualified as judge of whether or not standards. Breakdown test is gradually increases imposed under certain conditions in the specimen on the voltage until the specimen until the breakdown occurred.
2. high speed voltage switching charge and discharge high voltage components and components
The component parts of design including design and control loop stability control, stability control circuit model includes components such as stability, stability analysis, circuit testing. Interference control method to reduce parasitic capacitance, parasitic capacitance size and circuit board circuit board wiring geometric position, line width, line circuit boards must source material relating, in order to reduce line parasitic capacitance at first when designing will be vulnerable to interference point mark, the alignment of priority routing to the same marking point to consider when, last managed to line wiring.
3. software component parts
Control probes for the needle position, charging and discharging high voltage generator modules, control input voltage when charging is complete toward 12v led spotlight discharge measurement and display measurement results.
Three static power measuring module, LED full color wafer systems integration and test results
Completed high pressure produced device AC voltage adjustable variable circuit design making as Figure 4, using high pressure analysis bar actual volume measuring AC voltage amplitude peak on peak 6.26kV-maximum AC amplitude: 3.13kV, test validation results DC voltage value maximum value 8.08kV, Yu 8kV voltage through short circuit output end short circuit current test Yu discharge resistance: 1500 +/-1% conditions Xia, peak current up 5.46A (theory value: 8000/1500=5.33). Complete electrostatic point LED module specification validation in static voltage: 4Kv, and in the following test conditions:
(1) under normal temperature, Chang Shi, atmospheric environment
(2) test Sonde: wider than 1 GHz current Sonde
(3) the charging capacitor: 100 pF+/-10% (effective capacitance)
(4) the discharge resistance: 1500 w +/-1%
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