2HID lamp luminaire rectification effect change IEC60598-1 6th edition relative to the 5th edition, in the HID lamp luminaire rectification effect, the scope of application changed from the original metal halide lamp luminaire to some high pressure sodium lamp and some Metal halide lamp luminaires have also undergone many changes in test methods and test lines. The sixth edition of IEC60598-1 is based on F. in the IEC62035 "Safety Requirements for Gas Discharge Lamps (Except Fluorescent Lamps)". 6 "Possible conditions at the end of the life of the light source": Most high pressure sodium lamps and certain metal halide lamps may present a rectifying effect at the end of their life. To ensure safety under these conditions, adequate protection measures should be taken. The IEC 60598-1 version 6 standard specifies that certain metal halide lamps and certain high pressure sodium lamp lamps that may cause overload of the light source control device (ballast, transformer or starting device) should be subjected to rectification effect tests. The IEC 60598-1 5th Edition standard stipulates that the rectification effect test should be performed on metal halide lamp lamps that may affect the overload of the ballast, transformer or starting device according to the description of the light source. The method of the IEC60598-1 sixth edition regarding the rectification effect test of the HID lamp is as follows: the light source in the lamp is replaced by the test circuit shown in FIG. The test begins with the test circuit and the luminaire and control unit are stabilized at the ambient temperature of the draft shield. Change the resistance R to adjust the lamp current to 2 times the nominal lamp current without further adjustment of R. If the steady state has been reached before the abnormal thermal test temperature limit of 12.5.2 in IEC60598-1, the protection device of the thermal protection control device does not operate, then R needs to be adjusted to increase the current at appropriate intervals, such as 10% increments. In any case, the current is regulated to no more than three times the nominal lamp current. 2.1 IEC60598-1 5th Edition Method for Rectification Effect Test of HID Lamps (1) The lamps are not equipped with special devices, and its safety is only guaranteed by design. The light source in the luminaire is replaced by the test circuit of Figure 4. By changing the resistor R2, the source current is adjusted to the maximum, but not higher than three times the normal source current. (2) The luminaire is equipped with special equipment, but the device is outside the ballast, transformer or starting device, or combined inside the ballast, transformer or starting device, and has corresponding markings. The light source in the luminaire is replaced by the test circuit of Figure 4. By varying the resistance R2, the lamp current is adjusted to a value equal to 2 times the normal lamp current. After reaching a steady state, the current is increased in an appropriate step until the protection device is activated. Note that every step should be as steady as possible. The rectifying effect that occurs at the end of the life of the light source is the one-way flow of the lamp current. The DC component tends to saturate the ballast core, the magnetic ballast exhibits a low impedance, and the current surges, causing the ballast coil temperature to rise sharply. If there is no temperature overheat protection, the ballast coil may be burned. The test circuit of Figure 1 is not a simulated actual light source, but only a device that makes high asymmetric test current possible. Compared with Figure 4 of IEC60598-1 5th edition, the test circuit of Figure 1 is simpler. The lamp current waveform of IEC60598-1 6th edition (Fig. 2) is the same as the lamp current waveform of IEC60598-1 5th edition (Fig. 5). Only when R = 0, a short circuit current of 50/60 Hz flows through the ballast. Increasing the resistance of the resistor R, when the diode is turned on, a higher asymmetrical current flows in a half cycle, and the rms current through the ballast increases due to DC compensation. The variable resistor R in Fig. 1 does not have to withstand such a high asymmetrical current, and only a current that does not exceed the short-circuit current flows in a half cycle of each cycle. Figure 1 (IEC 60598-1, 6th Edition) uses fewer components than Figure 4 (IEC 60598-1 5th Edition). Figure 1 (IEC 60598-1, 6th Edition) The voltage waveforms at both ends of the resistor (ie, the ends of the diode) in the test circuit are shown in Figure 3. Figure 4 (IEC 60598-1, 5th Edition) The voltage waveform across the capacitor in the test circuit is shown in Figure 6. . For the protection circuit of the automatic reset protection device, many "on/off" cycles may occur before the maximum temperature is reached.
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