Method and device for fluorescent lamp two-wire system dimming control

A technology of dimming control and dimming control signal, which is applied in the field of triac dimming control device and two-wire dimming control of fluorescent lamps, which can solve the problems of large total current harmonic distortion and reduce current harmonic interference. Effect

CN101568222AInactive Publication Date: 2009-10-28纵领电子(上海)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-10-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method and a device for fluorescent lamp two-wire system dimming control. A user end microprocessor receives a user request signal to ensure that the change in a circuit is impeded, thereby a large chamfer voltage waveform signal is formed on an alternating wire within a period of time and forms a dimming control signal after being subjected to waveform conversion of an electronic ballast and signal detection processing. The device is formed by connecting a user control end and an electronic ballast end through alternating current wires. The user control end comprises a dimming control signal input circuit, an impedance switching circuit and a bidirectional control silicon circuit; and the electronic ballast end comprises a rectifying circuit, a power factor correction circuit and an inverter circuit which are sequentially connected, and a waveform conversion circuit, a waveform recognition and digital / analogue conversion circuit and a lower-pass filter circuit. The invention forms the large chamfer voltage waveform signal only in short time for regulation and control operation and only maintains a smaller initial chamfer in other time, therefore, the power factor of the ballast can be maintained above 0.95 and the total current harmonic distortion can be improved to be less than 20 percent.
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Description

Technical field

[0001] The patent of the invention relates to the dimming control technology of fluorescent lamps with electronic ballasts, in particular to a two-wire dimming control method for fluorescent lamps and a bidirectional thyristor dimming control device.

Background technique

[0002] At present, among the light sources for indoor lighting, incandescent lamps have been gradually eliminated due to their low luminous efficiency, high power consumption, and short lifespan. With the development of new materials, new structures, new design theories and manufacturing processes, the comprehensive performance of fluorescent lamps has been greatly improved. With the continuous development of energy-saving and high-efficiency technical advantages, fluorescent lamps have become the main light source for architectural lighting.

[0003] Electronic ballasts for dimmable fluorescent lamps have obvious power-saving effects, and have been rapidly developed and applied in rec...

Examples

Embodiment Construction

[0058] see Figure 4 , the fluorescent lamp two-wire dimming control device of the present invention is formed by connecting the user dimming control terminal 1 and the electronic ballast terminal 2 through a single-phase AC transmission line L1.

[0059] The dimming control signal input circuit 6 is formed by the first microprocessor MCU1 in the user dimming control terminal 1, and the signal output terminal of the dimming control signal input circuit 6 is connected to the impedance switching circuit 4, and the resistance R1 in the impedance switching circuit 4 and The bidirectional thyristor circuit 3 is connected, and constitutes a phase shifting circuit in the bidirectional thyristor circuit 3 (by Figure 4 A part of the phase-shift capacitor C, fixed phase-shift resistor R1, and the first transistor bias resistor R2). The general-purpose input / output port of the first microprocessor MCU1 is connected with the user dimming interface device 13 (referring to Figure 5 ), t...