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发明授权
CN101578923B 放电灯点亮装置 失效 - 权利终止

放电灯点亮装置
摘要：
本发明提供一种放电灯点亮装置。具备：对从与直流电源(2)连接的逆变器电路(3)经由多个变压器(41～4n)向各放电灯(11～1n)流过的管电流(I1～In)的检测电压(VI1～VIn)进行输出的管电流检测电路(51～5n)；对管电流检测电路(51～5n)的检测电压(VI1～VIn)的最大值(VIMX)进行检测的最大值检测电路(6)；对管电流检测电路(51～5n)的检测电压(VI1～VIn)的最小值(VIMN)进行检测的最小值检测电路(7)；计算出最大值检测电路(6)的最大值(VIMX)与最小值检测电路(7)的最小值(VIMN)的和值、差值、乘积值和商值中的某一个或多个运算值，在该运算值超过了规定值时输出停止信号(VCP)的比较电路(8)；以及在比较电路(8)输出了停止信号(VCP)时，停止逆变器电路(3)的控制电路(9)。利用比较电路(8)的运算值可靠地对由放电灯的连接不良而产生的电弧放电进行检测，而从由于电弧放电引起的连接不良部位的过热可靠地保护放电灯。
摘要（英）：

A discharge lamp lighting device is provided to comprise tube current detecting circuits (51-5n) for outputting detection signals (VI1-VIn) of tube currents (I1-In) flowing through each discharge lamp (11-1n) from an inverter (3) connected to DC power source (2) via a plurality of transformers (41-4n), a maximum detector (6) for detecting a maximum value (VIMX) of detected signals (VI1-VIn) from current detector (51-5n), a minimum detector (7) for detecting a minimum value (VIMN) of detected signals (VI1-VIn) from current detector (51-5n), a comparison circuit (8) for computing one or plural values of sum, difference, product and quotient between maximum value (VIMX) from maximum detector (6) and minimum value (VIMN) from minimum detector (7) to generate a cease signal (VCP) when the computed value exceeds a given value; and a control circuit (9) for halting operation of inverter (3) when comparison circuit (8) generates cease signal (VCP). The device can reliably detect arc discharge resulted from electric connection failure in discharge lamp or lamps by the computed values from comparison circuit 8 to positively protect discharge lamps from overheating by arc discharge at a bad connection location.

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