A standard rectifier for full-specification adjustable high-frequency fluorescent lamp

Abstract

Characters of the ballast are that the set of band switch includes at least three band switches connected to each other in series; resistance is connected to adjacent contacts of each band switch; through first resistance, first band switch is connected to first terminal post; final band switch is connected to second terminal post; the last band switch through second resistance is connected to third terminal post. The disclosed ballast is composed of a set of non-inductive resistance with different powers and numerical values of resistance. Multiple band diverter switches control adjustment for impedances in different orders of magnitude of highfrequency base ballast (HBB) so as to guarantee continuously adjustable impedance and impedance values to cover needed values of HBB of each fluorescent lamp. Advantages are: simple and practical, omitting shortcoming that each HBB is corresponding to specification of each highfrequency fluorescent lamp.

Description

Technical field: [0001] The invention relates to a high-frequency fluorescent lamp reference ballast used for testing high-frequency fluorescent lamps, electrodeless fluorescent lamps and electronic ballasts, especially a high-frequency fluorescent lamp reference ballast that can be adjusted to various specifications of high-frequency fluorescent lamps. ballast. Background technique: [0002] At present, in the detection of high-frequency fluorescent lamps, electrodeless fluorescent lamps and corresponding high-frequency electronic ballasts, in order to ensure that the reference ballasts of high-frequency fluorescent lamps can not only be suitable for the power of the corresponding fluorescent lamps, but also prevent impedance drift caused by overheating, and can also To meet the requirements of distributed series inductance and parallel distributed capacitance, domestic and foreign testing agencies and manufacturers adopt a fixed high-frequency fluorescent lamp reference ba...

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of this method is two aspects. For many specifications of high-frequency fluorescent lamps, it is necessary to have 70 to 80 kinds of special modules to cover all the specifications of the current domestic and foreign standards.

In addition, since new non-standard high-frequency fluorescent lamp specifications are still emerging, a reference ballast module must be added every time a new specification appears, which causes great inconvenience to the detection and development of new high-frequency fluorescent lamps

Although the method of adjusting the impedance of high-frequency reference ballasts with electronic circuits developed in China in recent years can achieve continuous impedance adjustment for all types of fluorescent lamps with full specifications, that is, the so-called digital adjustment method, but this method is the most The fatal flaw is that the electronic circuit will change its own internal impedance with the change of the voltage and current parameters of the external load fluorescent lamp, so that the digital adjustment method of the electronic circuit cannot provide a reference value during detection

Another constant current source output method composed of electronic circuits can also ensure continuous adjustable and constant output current, and can be applied to high-frequency fluorescent lamps of various specifications, but because of the very high internal resistance of the constant current source, when the external When the voltage and current parameters of the load high-frequency fluorescent lamp change, the high internal resistance characteristics of the constant current source will "cover up" this change, so it cannot provide a reference value for the detection of high-frequency fluorescent lamps

The above two methods cannot meet the requirements of relevant product standards at home and abroad because of these insurmountable shortcomings and the excessive internal series distributed inductance and parallel distributed capacitance, so they have not been accepted by major lighting electrical testing institutions at home and abroad. It can only be used in occasions where non-standard methods are used to roughly test the parameters of high-frequency fluorescent lamps

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