Current equalizing lamp tube module and multiple-tube equalizing circuit

Abstract

The invention relates to a flow equalizing tube module that driven by one power source, wherein said module comprises one first flow equalizing unit, one second flow equalizing unit and one balance transformer; the first flow equalizing unit comprises one first transformer, one first tube and one second tube; one coil of first transformer is connected to the power source; two ends of another coil of first transformer are connected to the first and second tubes; the second flow equalizing unit comprises one second transformer, one third tube and one fourth tube; one coil of second transformer is connected to the power source; two ends of another coil of second transformer are connected to the third and fourth tubes; one coil of balance transformer is connected to the first tube, while another coil is connected to the fourth tube.

Description

technical field [0001] The present invention relates to a lamp module and a multi-lamp circuit, in particular to a current-equalizing lamp module and a multi-lamp current-equalizing circuit. Background technique [0002] Due to the better brightness of the cold cathode lamp, in addition to being used as a light source, it can also be used as a backlight source for electronic devices such as liquid crystal displays. [0003] At present, the driving circuit of the existing cold cathode lamp is as follows: figure 1 As shown, a power source 11 is electrically connected to a coil 121 of a transformer 12 , and the two lamps 14 and 16 are electrically connected to another coil 122 of the transformer 12 through two capacitors 13 and 15 respectively. However, this connection method cannot ensure that the working currents of the lamps 14 and 16 are the same, so that the brightness of the lamps 14 and 16 will be different. [0004] Furthermore, there is another drive circuit that add...

AI Technical Summary

Problems solved by technology

[0006] However, although this matching method can ensure that the operating currents of the lamp tubes 24 and 26 are consistent, if more sets of lamp tubes need to be connected, a balance transformer must be configured for each of the two lamp tubes to ensure that the currents of each lamp tube are consistent. The working current of the lamp tubes is the same, so that the brightness of each lamp tube is the same, but this implementation method will increase the cost, which is not conducive to production

Images