A controller for gas discharge lamp with magnetic ballast

Abstract

The invention discloses a controller of a gas discharge lamp having an inductive ballast. The controller comprises an energy storage device, a zero crossing detection circuit, a voltage comparison circuit, and a drive circuit. The two ends of the energy storage device are connected in parallel with a switch device. According to the invention, the zero crossing detection circuit is employed to detect the alternating-current conversion of alternating-current power and output an alternating-current power zero crossing signal. The alternating-current power zero crossing signal is compared with a light modulation control signal for multiple times, and a drive signal driving a switch element is obtained and used for driving the conduction and closure of the switch element. The energy storage device conducts current limiting adjustment of the inductive ballast of the gas discharge lamp by virtue of charging and discharging, thereby adjusting electric energy of a load and realizing a final light modulation energy saving effect. Therefore, the controller of the invention can overcome the phenomenon that an original inductive ballast cannot perform light modulation independently; the controller has no special requirement on the power supply of a power grid and can realize linear adjustable light; and the controller does not generate extra power consumption additionally and maintains a relatively high power factor.

Description

technical field [0001] The invention belongs to the technical field of lighting equipment control, and in particular relates to a controller for a gas discharge lamp of an inductance ballast. Background technique [0002] The gas discharge lamps sold in the market today, including sodium lamps, metal halide lamps and other lamps used for conventional outdoor lighting, are traditionally equipped with magnetic ballasts. The magnetic ballasts can be used for a long time during use, and the failure rate is low. , Compared with electronic ballasts, the cost is relatively low, and it has been recognized by many lighting manufacturers and owners. However, the only disadvantage of magnetic ballasts is that they cannot be controlled for power saving, and can only be guaranteed to work at full power, and cannot achieve the effect of intelligent power saving. [0003] Now there are many energy-saving companies, such as EMC (Electromagnetic Compatibility) companies, and the country is ...

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Problems solved by technology

[0005] (1) Adjust the inductance of the inductance ballast. By changing the inductance in the line, the induced electromotive force generated in the inductance changes, thereby affecting the change in the working current and changing the output power. However, this technical solution involves The inductance used is large in size and has many pins, and the number of relays used to change the inductance is also large. During the switching process, high-voltage arcs are easily pulled out on the relays, which poses hidden dangers to the use of rectifiers and power savers.

[0006] (2) Using frequency modulation technology, frequency modulation will increase the internal resistance of the power supply, and it will also have a great impact on the power grid, which will cause the instability of the power grid, and the performance requirements for the inductance rectifier and the light source are also high, to a certain extent , which increases the cost of renovation

[0007] (3) ChenJing and PiaoAnlin proposed in the literature titled The Fully Dimming Technology of Fluorescent Lamp with Magnetic Ballast (China Light & Lighting, 2011.7) to use AC phase modulation alone to cut off the excess power in the power supply to control the current passing through the lamp to achieve dimming; but this If the method is used in the magnetic ballast, it will cause the continuous energy of the magnetic ballast to be insufficient when it is working, resulting in the flickering phenomenon of the lamp, and by detecting the zero-crossing signal, the single-chip control delays a certain period of time to connect the AC power, which will make the AC power switch on At the moment, the voltage is in a high-voltage state, and zero-crossing access is not used, which will have an impact on the circuit

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