Pre-heating control apparatus for adjusting gas discharge light tube electric voltage
A technology for adjusting gas and preheating control, applied to lighting devices, electric light sources, electrical components, etc., can solve problems affecting circuit design parameters, unfavorable competition of electronic ballasts, and increasing DC link capacitance, etc.
Active Publication Date: 2008-06-25
IND TECH RES INST
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Problems solved by technology
[0003] There are currently two solutions, one is to change back to the standard half-bridge structure, the other is to add an external switch to force the lamp voltage to zero voltage (0V), but both have their shortcomings, the former will affect the original circuit Design parameters, and increase the DC link capacitance, and system common ground issues; the latter will add additional circuits and external switches will increase component costs
The lack of both makes the existing electronic ballasts unfavorable to the competition in the market. Therefore, if the existing structure can be improved, it can not only reduce the redesign time, but also speed up the market introduction
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[0021] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.
[0022] The present invention mainly proposes a new control mode, which can effectively reduce the lamp voltage (VLAMP) during preheating and maintain the preheating current required by the lamp.
[0023] As shown in Fig. 2 and Fig. 3, it is the circuit architecture diagram of the gas discharge lamp module and its electronic ballast of the present invention, and the circuit architecture diagram of the electronic ballast, wherein said lamp module 2 is an existing architecture ( Including: DC link capacitor 21, first transistor 22, second transistor 23, transformer 24 and lamp tube 25), so it will not be repeated here. The electronic ballast 1 of the present invention includes the following parts: reference voltage (Vref ) generator 11, lamp voltage adjustment circuit 12, 50% duty cycle reference value 13, pu...
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The invention relates to a preheating controller for regulating voltage of a gas discharge lamp tube, which is a controller used for the gas discharge lamp tube, and comprises a pulse width regulation circuit which is used for controlling voltage of the lamp tube during preheating, a pulse wave frequency regulation circuit which is used for controlling frequency of the lamp tube when the lamp tube is stable to stabilize electric current of the lamp tube, and a timing device which is used for determing preheating time of the lamp tube.
Description
technical field [0001] The present invention relates to a preheating control device capable of adjusting the voltage of a gas discharge lamp, in particular to a device for controlling the lamp voltage of a gas discharge lamp during preheating by using pulse width modulation (PWM) technology, which can effectively Reduce lamp voltage to avoid glow current during preheat and still maintain required filament preheat current. In the steady state, it returns to the pulse frequency modulation (PFM) control to stabilize the lamp current. The control method proposed in this patent can achieve the desired result without changing the half-bridge driver architecture and resonant tank network of the existing products. The control method proposed in this patent can be easily realized by using an analog integrated circuit or a digital controller, and can be quickly introduced into product applications. Background technique [0002] At present, most of the half-bridge drivers in the exis...
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IPC IPC(8): H05B41/295H05B41/30H03K5/01
Inventor 古忠平李清然
Owner IND TECH RES INST