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Electronic ballast

An electronic ballast and voltage technology, applied in electric light sources, electrical components, lighting devices, etc., can solve the problems of many links and low efficiency, and achieve the effect of simple circuit and high efficiency

Inactive Publication Date: 2008-03-12
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this topology is that there are too many links, low efficiency, and large EMI (Electro Magnetic Interference: electromagnetic interference)

Method used

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Embodiment Construction

[0056] A preferred embodiment of the present invention is shown in Figure 2, which includes a rectification and filtering circuit for rectifying and filtering ordinary AC power; a high-voltage trigger for providing a high-voltage trigger signal for load R0 at startup, and switching inverter and control unit,

[0057]The switching inverter receives the DC output from the rectification and filtering circuit, and converts the received DC power into a voltage and current that matches the electrical characteristics of the load R0, and then converts the DC power into a medium and low frequency square wave signal for driving the load R0 The operation; the load R0 here is mainly for MH (metal halide) lamps, and can also be other purely resistive loads, inductive loads, and loads in various applications where the output frequency is industrial frequency.

[0058] The control unit is used to control the operation of the electronic ballast. The start and operation of the MH lamp is cont...

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Abstract

The present invention discloses an electronic ballast, which comprises a rectifier-filter circuit and a high pressure trigger and also comprises a switch inverter and a control unit, the switch inverter converts the direct current outputted by the rectifier-filter circuit into the voltage and the current matched with the load electrical property, and changes the direct current into a middle frequency square wave signal and a low frequency square wave signal, to drive the load operation; the switch inverter comprises a full bridge inverter circuit or comprises a half bridge inverter circuit, the DC / DC and the DC / AC two-stage conversions are completed with the one-stage DC / AC conversion, to ensure that the circuit is simple; the control unit adopts a PWM control technology, two functions of the property matching and the inversion are realized, and a function of a soft switch is realized, to ensure that the efficiency is very high; the present invention is mainly suitable for a HID light, in particular to the control of the HID light, the present invention also can be applied in a pure resistance load, an inductive character load, a capacitive load and various application occasions that an output frequency is a middle frequency and a low frequency.

Description

technical field [0001] The invention relates to a current control switching device, in particular to an electronic ballast. Background technique [0002] Recently, HID (High Pressure Intensity Discharge) lamps have received more and more attention in the field of home and commercial lighting. Among various HID lamps, MH (Metal Halide) lamps have good color temperature, high luminous efficiency, and stable brightness. And long life and other advantages become the most popular light source. Since the incremental resistance of the MH lamp is negative, the ballast must be connected in series with the lamp, otherwise the lamp current will be out of control. The traditional method uses an inductor, called an electromagnetic ballast, to drive the MH lamp, but the electromagnetic ballast has many disadvantages, such as low efficiency, bulky, large volume, and low power factor. [0003] HID lamps generally work in the frequency range of 8kHz to 100kHz, and are prone to acoustic res...

Claims

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Application Information

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IPC IPC(8): H05B41/14
Inventor 张卫平张东彦赵徐森
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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