With the gradual popularity of LED lights, traditional energy-saving lamps and fluorescent lamps slowly exit the market. In the next few years, LED lamps will become the mainstream lighting products. Of course, in the transition period of these years, energy-saving lamps and fluorescent lamps still dominate the mainstream in some areas. As with the basic components of LED lights, energy-saving lamps are also composed of lamps (light source), electronic rectifiers and fixtures (cases), among which the quality of electronic rectifiers, one of the most important parts, determines energy saving to a large extent. The service life of the lamp is most prominent in the high-frequency reference rectifier (25KHz) used in the T5 lamp. How to detect high-frequency electronic rectifiers has become the key, for which the IEC (International Electrotechnical Commission) has developed relevant test standards mainly IEC60081 (double-ended fluorescent lamp test requirements) and IEC60901 (single-end fluorescent lamp testing requirements). At the same time, according to the actual situation, there is another IEC equivalent test method.
In response to IEC test requirements, Shanghai Power Electronics developed HFP-800 (high frequency test power supply) + RB-3 (high frequency reference rectifier) ​​+ LPS-3 (light tube warm-up source) test system. The HFP-800 high-frequency test system fully complies with IEC60081 and IEC60901 test requirements. Its working principle is as follows:
IEC60081 specifies the test method for double-ended fluorescent lamps. IEC60901 specifies the test methods for single-ended fluorescent lamps. The test methods and instrument connections required by the IEC standard are shown in Figure 1. As we know, the role of the reference rectifier is to filter the reference lamp (lamp) and the rectifier is designed, and the reference rectifier is characterized by a stable voltage-to-current ratio at the rated frequency, relatively independent of voltage, temperature and ambient environment changes. Impact. In this system, the RB-3 (high-frequency reference rectifier) ​​uses a non-inductive resistor rectifier, while the HFP-800 (high-frequency regulated power supply) provides pure, high-frequency output power to the high-frequency reference rectifier, followed by LPS. -1 (lamp warm-up system). The related technical requirements of HFP-800 and RB-3 are completely designed and manufactured according to IEC standards. For detailed parameters, see IEC60081 and IEC60901 standards. The HFP-800+RB-3+LPS-3 system provides a standard test environment for the reference lamp (light) under the IEC standard.
Taking into account the economic benefits and costs of the test, Shanghai Power Electronics also developed and designed another device HCS-105A high-frequency reference rectifier test system. Compared with the test method recommended by the IEC standard, the HCS-105A system uses the same test method (constant current test method). Its working principle is as follows:
The HCS-105A has two functions: one is a high-frequency reference rectifier; the other is a high-frequency electrical parameter table. As shown in Figure 2, when we connect the line, the high-frequency constant current source will send a high voltage to start the lamp. The frequency output range of the high-frequency constant current source is 20-26 kHz. It can provide continuously adjustable current of 100mA-500mA. An obvious disadvantage of the IEC equivalent test method (constant current test method) is that a high-frequency constant current source will output internal impedance, and a large amount of output impedance will cover the normal standard electrical parameters of the reference lamp (lamp) under test. This is about 5%- 30% error. This system is mainly aimed at some small test laboratories and benchmark lamp (light tube) manufacturers.
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