200908802 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種放電燈點燈裝置，用以使複數個冷 陰極放電燈（CCFL · Cold Cathode Fluorescent Lamp)、外部200908802 IX. Description of the Invention: [Technical Field] The present invention relates to a discharge lamp lighting device for making a plurality of CCFLs (Cold Cathode Fluorescent Lamps), external
電極螢光燈或螢光燈等之放電燈點燈D 【先前技術】 冷陰極放電燈，一般係利用變流器（inverter)，用數 10kHz之頻率且施加數百v〜千數百v之電壓來進行點燈。 又，亦有稱為外部電極螢光燈（EEFL : Externai Electrode Flu〇rescent Lamp)之螢光管。外部電極螢光燈與冷陰極放 電燈之電極構造不同，其他幾乎相同，發光原理亦與冷陰 極放電燈相同。因此，用來使外部電極螢光燈或冷陰極放 電燈點燈之變流器之原理係相同。因此，以下，使用冷陰 極放電燈（簡稱放電燈）加以說明。 放電燈與變流器係使用於液晶電視、液晶監視器、照 明裝置、液晶顯示裝置、看板等。變流器大多是利用變壓 益進行升壓，在該變流器中，有稱為所謂「一端高壓」之 系統與稱為「兩端電壓」之系統。一端高壓系統係變歷器 之二次繞組（放電燈側）之一側對接地（GND)為低壓之系 統’兩端高壓系統係變壓器之二次繞組之兩端對接地為高 壓之系統。 圖1係使用關聯之一端高壓系統之放電燈點燈裝置之 電路圖。該一端高壓系統係以變流器部2〇與面板部3〇構 200908802 成’變流器部20係將直流電壓轉換為高頻電壓，利用變 壓器T3將高頻電壓升壓，在變壓器T3之二次繞組S1 (一 端接地）產生高壓的高頻電壓。藉由二次繞組Si所產生之 南頻電壓，使電流在面板部3〇内之放電燈1流動，而使 放電燈1點燈。又，流經放電燈丨之電流，係利用由電流 檢測用電阻器R1與二極體（D1、D2)構成之電流檢測電路 進行檢測。控制電路（未圖示）係進行控制，使得所檢測之 電流成為既定值。 f. 此一端高壓系統除了有流至放電燈1或電路元件之電 流外，亦有流至寄生電容器之電流。作為流經變壓器T3 之二次繞組S1之電流路徑有：流經用以檢測二次繞組S1 之電壓的電壓檢測用電容器C1、C2之電流路徑（1);流經 位於配線等、主要是高壓部與底板等之間的寄生電容器C5 之电流路徑（2);以及流經放電燈1之電流路徑（3)。 知·而5 ，由於底板等亦係接地（gr〇und)電位，因此 C ；流至底板等之洩漏電流係直接返回變壓器T3。因此，圖i 中’由於路徑⑴與路徑⑺之電流不流至電流檢測用電 阻β R1 ’流至電流檢測用電阻器Rl者僅係路徑（3)，因此 一 ^檢測出流至放電燈丨之電流。使用此電流檢測值，能 :=度進仃回授控制。又，圖1之例中，由於電壓檢測用 電合益C2與電流檢測用電阻器R1皆接地，因此容易進行 將接^電位作為基準之電流檢測。圖2係表示將圖1所示 端阿壓系統構裝於面板部之構成例。如圖丨所示，在 板邛30併設複數個放電燈丨，各放電燈！係以電線3連 200908802 接於變流器部20,變流器部2〇係以丨片基板構成。 另方面，由於兩端高壓系統無法確定變壓器之二次 %組之接地電位，且二次繞組之兩端係高壓，因此不易檢 測流至放電燈之電流或變壓器之電壓。因此，冑3所示之 兩端高壓系統係把變壓器T4之二次側#作第丄二次繞組§1 ”第2 一-人繞組S2，將各繞組之—端接地，藉此確定變壓 器T4之二次側之接地電位，以接地電位為基準，進行各 繞組之電流、電壓檢測。 此時’作為電流之路徑有：流經電壓檢測用電容器CM、 C2 C3、C4之電流路徑⑴；流經配線等所產生之寄生電 容器C5、〇6之電流路徑⑺；以及流經放電燈卜u之電 流路徑（3)。由於流至電流檢測用電阻器ri、r2之電流僅 係路仏（3) ’因此僅能檢測流至放電燈hα之電流。使 二=流檢出值能高精度進行回授控制。χ，由於電壓檢 測用电谷器C2、C4與電流檢測用電阻器以 因此能進行以接地電位為基準之電流檢測。 型公：實::：關聯技術’例#，已知有揭示於曰本公開新 報貫開平6~ 19299號者。 【發明内容】 述系統中’必須在各放電燈i a、 極體D1、D2 β 4 6又置由一 及電W檢測用電阻器R1構成 測電路與由電流檢 之第 i電流檢測用電阻器R2構成 電-檢测電路。圖4係表示將圖3所示之兩端高壓 200908802 系統構裝於面板部之構成例_ 邪圓1⑺不，隊了變流器部 用之基板20a以外，增設了筮！帝、* μ、，^ 第1電k檢測電路及第2電流 檢測電路用之基板20b。又，必項机罟$社认甘1 义頊汉置連接於基板20a、2〇b 之連接器、配線等，使得成本增加。因此，為降低成本， 如圖5所示’將電流檢測用電阻器Ri、R2等之電流檢測 電路設置於變流器部，由丨片基板構成。 然而，圖5所示之構成例中，作為流至變壓器τ5之 一次繞組SI、S2之電流路徑有：流經電壓檢測用電容器 Cl、C2、C3、C4之電流路徑（1);流經產生於配線等之寄 生電容器C5、C6之電流路徑（2);以及流經放電燈^ 之電流路徑（3)。㈣，有路徑⑴之電流流至電流檢測用電 阻器Rl、R2之問題點。 決定放電燈亮度的係路徑（3)之電流值，路徑（丨）之電流 值無助於亮度。因此，當用混合路徑之電流之檢測值進 行回授控制時，待放電燈點燈後，放電燈電流隨時間而變 化。又’即使因周圍溫度或裝置構裝狀態亦會引起放電燈 電流變化之現象。 具體而言，由於低溫時放電燈之阻抗提高，因此必須 在二次繞組SI、S2產生高的電壓。因此，由於路徑（1)之 電流增加’流至電流檢測用電阻器RJ、R2之電流增加， 結果，流至放電燈1 a、1 b之電流減少。高溫時，由於路徑 (1)之電流減少’流至電流檢測用電阻器R1、r2之電流減 少，結果，流至放電燈la、lb之電流增加。亦即，放電燈 在低溫時變暗，在高溫時變亮，亮度產生變化。 200908802 因此，圖5所示之電路，雖有能用丨片基板構成之優 點，但流至放電燈之電流會因溫度變化等而變動。 根據本發明，能提供一種不必增加電流檢測電路用之 基板片數，且能高精度檢測流至放電燈之電流之放電燈點 燈裝置。 為解決上述問題，根據本發明之第1技術面，放電燈 點燈裝置，具有： 變流器，具備具有一次繞組與第1二次繞組與第2二 次繞組的變壓器，將直流電壓轉換為高頻電壓，利用該變 壓器將該高頻電壓升壓； 1個以上之放電燈，連接於該變壓器之第丨二次繞組 與第2二次繞組之一端間； 第1電流檢測電路，一端連接於該變壓器之第丨二次 組之另—端，另一端接地，用以檢測電流；以及 第1檢測電路，連接於該變壓器之第1二次繞組之兩 端’用以檢測該變壓器之第i二次繞組所產生之電壓。 根據本發明之第2技術面’進而’該第1檢測電路具 有： … 第1串聯電路，連接於該變壓器之第1二次繞組之兩 端’且串聯有第1電容器與第2電容器；以及 第1電壓檢測電路，檢測該第i電容器或該第2電容 器之兩端電麗。 *根據本發明之第3技術面，在第1或第2技術面中， 該第1檢測電路具有：第丨串聯電路，連接於該變壓器之 200908802 第J二次繞組之兩端’且串聯有第i電容器與第2電容器; 將该第1電容器與該第2電容器之接點和該接地間之電壓 當作檢測電壓。 根據本發明之第4技術面，在第i至第3之任一技術 面中’具有：f 2檢測電路’連接於該變壓器之第2二次 繞組之兩端’用以檢測產生於該變壓器之帛2二次繞組之 面中技術面’在第1至第3之"術 笛 - 電肌檢測電路，一端連接於該變壓器之 及第人堯、且之另一端’另一端接地’用以檢測電流；以 及弟2檢測電路，連接於 用以檢測該變壓器之第2二：之第2-次繞組之兩端， 之第2 —次繞組所產生之電壓。 根據本發明之第6枯分· & ^咏 該第2檢測電路具有：二’在第4或第5之技術面中’ 第2二次繞組 _聯電路，連接於該變壓器之 以及第2番厂、 ，且串聯有第3電容器與第4電容器， 容器之兩端電壓。 係^則該第3電容器或該第4電 根據本發明之第7 _ 2檢測電路罝有.第2術面’在第5之技術面中，該第 二次繞組之兩端，且串：二電路’連接於該變壓器之第2 該第3電容器與該第4電/„3電容器與第4電容器；將 作檢測電壓。 各器之接點和該接地間之電壓當 【實施方式】 10 200908802 x下’邊參照圖式邊詳細說明本發明之放電燈點燈裝 置之實施形態。 實施仓 圖 6 {系™ , '、义不本發明之實施例1之放電燈點燈裝置之構 成圖圖6中’變壓器T1具有一次繞組P1與第1二次繞 組S1盘第 2 _ a ；t /、 —久繞組S2，用以構成變流器。該變流器係 利用控制電路 长 1禾圖不）使開關元件（未圖示）開/關，藉此將 直/;1L電壓轉換為高頻電壓，利用變壓器T1將該高頻電壓 K在第1 :次繞、组si與第2二次繞組S2輸出。 在變壓器Τ1之第】_ Α 罘1 一-人繞組S 1之一端與第2二次繞組S2 之-端間，串聯放電燈la與放電燈lb。 放電k 1 a、1 b，例如係由冷陰極放電燈、外部電極螢 光燈或螢光燈構成。此處係使用冷陰極放電燈。 在變壓器T1之第1 -戈蟢細 弗1 一_人繞組S1之一端與放電燈1& 之接點與接地間連接寄生電容器C5。在變壓器T1之第】 二次繞組si之兩端連接電壓檢測用電容器ci(第i電容器） 與電壓檢測用電容器〇2(第2電容器）之串聯電路。 在變壓器T1之第2二次繞蚯Μ 4 t 且S2之一端與放電燈lb 之接點與接地間連接寄生電容器C6。y·樹广， 在變壓器T1之第2 二次繞組S2之兩端連接電壓檢測用雷 印電容器C3(第3電容器） 與電壓檢測用電容器C4(第4電容哭、^山 各4 )之串聯電路。 在變壓器T1之第1二次繞組SlDischarge lamp lighting D such as electrode fluorescent lamp or fluorescent lamp [Prior Art] Cold cathode discharge lamp generally uses an inverter, and uses a frequency of several 10 kHz and applies hundreds of v to thousands of v. Voltage to light up. Further, there is also a fluorescent tube called an external electrode fluorescent lamp (EEFL: Externai Electrode Fluorescent Lamp). The electrode structure of the external electrode fluorescent lamp is different from that of the cold cathode discharge lamp, and the others are almost the same, and the principle of illumination is the same as that of the cold cathode discharge lamp. Therefore, the principle of the converter for lighting the external electrode fluorescent lamp or the cold cathode discharge lamp is the same. Therefore, the following description will be made using a cold cathode discharge lamp (abbreviated as a discharge lamp). Discharge lamps and converters are used in liquid crystal televisions, liquid crystal monitors, illumination devices, liquid crystal display devices, billboards, and the like. Most of the converters are boosted by a variable voltage. In this converter, there is a system called "one end high voltage" and a system called "voltage at both ends". One end of the high voltage system is one of the secondary windings (discharge lamp side) of the changer and the ground (GND) is low voltage. The high voltage system at both ends is the system in which the two ends of the secondary winding of the transformer are grounded to high voltage. Fig. 1 is a circuit diagram of a discharge lamp lighting device using a high-pressure system associated with one end. The one-end high-voltage system is configured such that the converter unit 20 converts the DC voltage into a high-frequency voltage by the converter unit 2〇 and the panel unit 3〇200908802, and boosts the high-frequency voltage by the transformer T3, and the transformer T3 is used. The secondary winding S1 (grounded at one end) generates a high-voltage, high-frequency voltage. The discharge lamp 1 is caused to flow by the discharge lamp 1 in the panel portion 3 by the south frequency voltage generated by the secondary winding Si, and the discharge lamp 1 is turned on. Further, the current flowing through the discharge lamp is detected by a current detecting circuit composed of a current detecting resistor R1 and diodes (D1, D2). A control circuit (not shown) controls so that the detected current becomes a predetermined value. f. The high voltage system at this end has a current flowing to the parasitic capacitor in addition to the current flowing to the discharge lamp 1 or the circuit components. The current path as the secondary winding S1 flowing through the transformer T3 includes a current path (1) flowing through the voltage detecting capacitors C1 and C2 for detecting the voltage of the secondary winding S1; flowing through the wiring, etc., mainly high voltage a current path (2) of the parasitic capacitor C5 between the portion and the bottom plate; and a current path (3) flowing through the discharge lamp 1. Knowing that 5, since the bottom plate and the like are also grounded, the leakage current flowing to the bottom plate or the like is directly returned to the transformer T3. Therefore, in Fig. i, since the currents of the path (1) and the path (7) do not flow to the current detecting resistor β R1 'to the current detecting resistor R1, only the path (3) is passed, so that the flow is detected to the discharge lamp. The current. Using this current detection value, the feedback control can be performed with := degrees. Further, in the example of Fig. 1, since the voltage detection power benefit C2 and the current detecting resistor R1 are both grounded, it is easy to perform current detection using the potential as a reference. Fig. 2 is a view showing an example of a configuration in which the end pressure system shown in Fig. 1 is attached to a panel portion. As shown in Figure ,, a plurality of discharge lamps 丨 are arranged in the 邛 30, and each discharge lamp! It is connected to the converter unit 20 by a wire 3 connection 200908802, and the converter unit 2 is formed of a slab substrate. On the other hand, since the high-voltage system at both ends cannot determine the ground potential of the secondary group of the transformer, and the two ends of the secondary winding are high-voltage, it is difficult to detect the current flowing to the discharge lamp or the voltage of the transformer. Therefore, the high-voltage system at both ends shown in 胄3 is the second side of the transformer T4 as the second secondary winding §1" the second one-person winding S2, grounding the ends of the windings, thereby determining the transformer T4 The ground potential of the secondary side is used to detect the current and voltage of each winding based on the ground potential. At this time, the path of the current is: a current path (1) flowing through the voltage detecting capacitors CM, C2, C3, and C4; The current path (7) of the parasitic capacitors C5 and 〇6 generated by wiring or the like; and the current path (3) flowing through the discharge lamp u. Since the current flowing to the current detecting resistors ri and r2 is only a path (3) "Therefore, only the current flowing to the discharge lamp hα can be detected. The two = flow detection value can be feedback control with high precision. χ, because the voltage detection battery C2, C4 and the current detecting resistor can The current detection based on the ground potential is performed. The type: public::: related technology 'example #, is known to be disclosed in the new publication of the 报本open Kaiping 6~ 19299. [Summary of the invention] Each discharge lamp ia, pole body D1, D2 β 4 6 is set again The electric resistance detecting circuit R1 constitutes a measuring circuit and the electric current detecting electric current detecting resistor R2 constitutes an electric detecting circuit. FIG. 4 shows the high-voltage high-voltage 200908802 system shown in FIG. In the case of the panel unit _ 邪 1 1 (7), the substrate for the converter unit is added, and the substrate for the first electric k detection circuit and the second current detection circuit is added. 20b. In addition, the machine must be connected to the connectors, wiring, etc. of the substrates 20a and 2b, so that the cost is increased. Therefore, in order to reduce the cost, as shown in Fig. 5, the current detection is performed. The current detecting circuit such as the resistors Ri and R2 is provided in the current transformer portion and is constituted by a slab substrate. However, in the configuration example shown in FIG. 5, the current paths flowing to the primary windings SI and S2 of the transformer τ5 are : a current path (1) flowing through the voltage detecting capacitors C1, C2, C3, and C4; a current path (2) flowing through the parasitic capacitors C5 and C6 generated in the wiring; and a current path flowing through the discharge lamp 3) (4), the current with path (1) flows to the current detecting resistors Rl, R2 Problem point. The current value of the system path (3) that determines the brightness of the discharge lamp, the current value of the path (丨) does not contribute to the brightness. Therefore, when the feedback value of the current of the hybrid path is used for the feedback control, the lamp point to be discharged After the lamp, the discharge lamp current changes with time. In addition, even if the ambient temperature or the device configuration state will cause the discharge lamp current to change. Specifically, since the impedance of the discharge lamp increases at low temperature, it must be twice. The windings SI and S2 generate a high voltage. Therefore, since the current of the path (1) increases, the current flowing to the current detecting resistors RJ and R2 increases, and as a result, the current flowing to the discharge lamps 1a and 1b decreases. At a high temperature, the current flowing to the current detecting resistors R1, r2 decreases due to the decrease in the current of the path (1), and as a result, the current flowing to the discharge lamps 1a, 1b increases. That is, the discharge lamp becomes dark at a low temperature, becomes bright at a high temperature, and changes in brightness. 200908802 Therefore, the circuit shown in Fig. 5 has the advantage of being able to be formed by a slab substrate, but the current flowing to the discharge lamp fluctuates due to temperature changes and the like. According to the present invention, it is possible to provide a discharge lamp lighting device capable of detecting the current flowing to the discharge lamp with high accuracy without increasing the number of substrates for the current detecting circuit. In order to solve the above problems, according to a first aspect of the present invention, a discharge lamp lighting device includes: a current transformer including a transformer having a primary winding, a first secondary winding, and a second secondary winding, and converting a DC voltage into The high-frequency voltage is boosted by the transformer; one or more discharge lamps are connected between the second secondary winding of the transformer and one end of the second secondary winding; and the first current detecting circuit is connected at one end At the other end of the second group of the transformer, the other end is grounded to detect the current; and the first detecting circuit is connected to the two ends of the first secondary winding of the transformer to detect the transformer The voltage generated by the secondary winding. According to a second aspect of the present invention, the first detecting circuit has: a first series circuit connected to both ends of the first secondary winding of the transformer and having a first capacitor and a second capacitor connected in series; The first voltage detecting circuit detects the both ends of the i-th capacitor or the second capacitor. According to a third aspect of the present invention, in the first or second aspect, the first detecting circuit has a second series circuit connected to both ends of the second winding of the transformer 200908802 and connected in series The i-th capacitor and the second capacitor; a voltage between the contact between the first capacitor and the second capacitor and the ground is regarded as a detection voltage. According to the fourth technical aspect of the present invention, in the technical aspects of any of the first to third aspects, 'having: an f 2 detecting circuit is connected to both ends of the second secondary winding of the transformer' for detecting the transformer Then, in the face of the secondary winding, the technical surface 'in the first to third's whistle-electric muscle detection circuit, one end is connected to the transformer and the other end, and the other end is 'grounded at the other end' The detection current is coupled to the second generation winding circuit for detecting the voltage generated by the second-order winding of the second and second windings of the second and second windings of the transformer. According to the sixth aspect of the present invention, the second detecting circuit has: two 'in the fourth or fifth technical plane', the second secondary winding_coupling circuit, connected to the transformer and the second The factory has a third capacitor and a fourth capacitor in series, and the voltage across the container. The third capacitor or the fourth electric power according to the seventh _ 2 detecting circuit of the present invention. The second surface 'in the fifth technical plane, the two ends of the second winding, and the string: The second circuit 'connects to the second third capacitor of the transformer and the fourth electric/third capacitor and the fourth capacitor; the detection voltage is applied. The voltage between the contacts of the respective devices and the ground is [Embodiment] 10 200908802, the embodiment of the discharge lamp lighting device of the present invention will be described in detail with reference to the drawings. FIG. 6 is a configuration diagram of a discharge lamp lighting device of Embodiment 1 of the present invention. In Fig. 6, 'transformer T1 has a primary winding P1 and a second secondary winding S1 disk 2nd_a; t /, - a long winding S2 for forming a current transformer. The converter uses a control circuit length 1 No) The switching element (not shown) is turned on/off, thereby converting the direct/;1L voltage into a high-frequency voltage, and the high-frequency voltage K is first to the second winding, the group si, and the second two by the transformer T1. The secondary winding S2 is output. Between the first end of the transformer Τ1 _ Α 罘1, the one end of the one-man winding S 1 and the end of the second secondary winding S2 Discharge lamp la and discharge lamp lb. Discharge k 1 a, 1 b, for example, consists of a cold cathode discharge lamp, an external electrode fluorescent lamp or a fluorescent lamp. Here, a cold cathode discharge lamp is used. 1 - 蟢 蟢 弗 1 1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ a series circuit of the i-th capacitor) and the voltage detecting capacitor 〇2 (second capacitor). A parasitic capacitor is connected between the second secondary winding 4 t of the transformer T1 and the contact of one end of the S2 with the discharge lamp lb and the ground. In the C6. Series circuit. The first secondary winding Sl of the transformer T1
〈另一端與接地之間， 連接二極體D2與電阻器R1之串躺φ I 電路及並聯於該串聯電 路之二極體D1，用二極體D1、也 與電阻器R1構成第i 200908802 電流檢測電路。 在變壓Τ1 + λ* ° 之第2二次繞組S2之另一端與接地之間， 連接二極體_ 〜電阻器R2之串聯電路及並聯於該串聯電 路之二極體EH，田 α 用二極體D3、D4與電阻器R2構成第2 電流檢測電路。 控制電路為、书山m & 句衣出用第1電流檢測電路所檢測之第1雷 流檢測值與用第2 +法 ％ 电"IL檢測電路所檢測之第2電流檢測佶 之平均電流值，傕兮巫+A( + + 使該千均電流值成為既定值，進行使開關 凡件開/關之PWM控制。 用 * (第電壓檢測電路）11 a係檢測電壓檢測 電谷益C2之兩端電壓，將所檢測之電壓輸出到控制 路（第2電壓檢測電路邱係檢 測用電容考^ ^ ° 兩端電壓，將所檢測之電壓輸出到控制 ::路乜制電路係判斷將來自電壓檢測電路之第 κ.: 之：二：與來自電壓檢測電路1 lb之第2電壓檢測值平均 =千均電壓值是否超過預定電壓值。亦即，電 1 la、Ub係用來判斷一 电格 斲一_人、，堯組S1之電壓及二次繞組S2之 冤壓是否過電壓。 根據如此構成之實施爿 生於變燈點燈裂置，利用產 在a S1 Γ1 一-人境，，且S1之兩端之電壓，使電流 二 2、S1延伸之電流路徑⑴朝順時針旋轉方 二:針D:::向流動。該電流路徑⑴之電流不丄 動。亦即，第R1構成之第1電流檢測電路令流 才P第1電流檢測電路係檢測從流至變壓器τι之 12 200908802 第1 -次繞，组si之電流去掉流至由電麼檢測用電容器cj ”電谷器C2構成之第1電塵檢測電路之電流。 又，利用產生於變塵器T1之第！二次繞組Sl之兩端 之電麼，使電流在沿S2、C4、C3、S2延伸之電流路徑⑴ 朝丨員a夺針知轉方向及逆時針旋轉方向流動。該電流路徑⑴ 之電流不在由二極體D3、D4與電阻器R2構成之第2電 路中流動。亦即，帛2電流檢測電路係檢測從流 交壓：^之第2二次繞組S2之電流去掉流至由電壓檢 &用電谷器C3與電容器C4構成之第2電|檢測電路之電 流。 因：’能控制因放電燈la、11}之阻抗變化所造成之回 變化。因此，不增加電流檢測電路用之基板片數， 且此局精度檢測流至放電燈U、比之電流。 又，電壓檢測電路1 la係檢測電壓檢測用電容器c2 之兩端電屢’電壓檢測電路llb係檢測電壓檢测用電容器 之兩端電塵。控制電路係當將來自電壓檢測電路11 a之 1電壓檢測值與來自電壓檢測電路i! 值平均之平均#厭# & 乐2電壓檢測 m 過預定電壓值時’二次繞組w之 -成為過電壓’亦即’能判斷為異常電壓。 實施例t 成圖圖圖7 之實施例2之放電燈點㈣置之構 i’把電塵檢測用電容器。與電壓檢測用電二= 點與接地間之電壓告从& 电各器C2之接 田作帛1電壓檢測值而輪出到控制電 13 200908802 路把電壓檢測用電容器C3與電壓檢測用電容器C4之接 點與接地間之電壓當作第2電壓檢測值而輸出到控制電路 2。簡要言之’帛1檢測電路係透過由二極冑D1、D2及 %阻态R1構成之第1電流檢測電路檢測出第1電壓檢測 值第2檢測電路係透過由二極體D3、D4及電阻器R2 構成之第2電流檢測電路檢測第2電壓檢測值。 —根據這樣的構 <，由於能獲得與實施Μ丨之效果大致 ，同樣的效果’並且能刪除電壓檢測電路11 a、11 b，因此更 加廉價。 實施你丨3 圖8係表示本發明之實施例3之放電燈點燈裝置之構 成圖。圖8所不之實施例3係相對於圖7所示之實施例2 之構成，其特徵係能刪除由二極體D3、D4及電阻器R2 構成之第2電流檢測電路。 亦即’有時亦可依據組品構裝狀態或用途，僅用由二 i , D1、D2及電阻器Ri構成之第1電流檢測電路進行 % /;'L檢測。因此，即使根據實施例3亦能獲得與實施例2 同樣之效果。 實施例4_ 圖9係表不本發明之實施例4之放電燈點燈裝置之構 成圖圖9所示之實施例4係相對於圖8所示之實施例3 構成其特徵係能刪除由電壓檢測用電容器c 3與電壓 ^測用電谷器C4構成之第2電壓檢測電路。 亦即’有時亦可根據組品構裝狀態或用途，僅用由電 200908802 欢則用电谷益C1與電壓檢測用電容器C2構成之第1電 路進行電壓檢測。因此，即使根據實施例4亦能 獲得與實施例3同樣之效果。 本叙明並非限於該實施例1至4之放電燈點燈裝 置者圖6〜圖9之實施例1至4中，雖放電燈係2個燈， 但放電燈亦可丨個燈…亦可組合實施例】至實施例4 :各構成。例如’在圖8、冑9中，亦可設置用以檢測電 壓檢測用電容器C1或電壓檢測用電容器C2之兩端電塵之 電壓檢測電路Ua。又，在圖8巾，亦可設置用以檢測電 壓檢測用電容11 C3或電驗測用電容器C4之兩端電壓之 電壓檢測電路11 b。 根據本發明之第1技術面，雖藉由產生於變壓器之第 1 =次繞組之兩端之電壓’使電流在第i檢測電路流動， 但該電流不在第1電流檢測電路流動。亦即，由於第i電 流檢測電路係檢測從流至變壓器之第1二次繞組之電流中 去掉流至第1檢測電路之電流，因此，能控制因放電燈之 阻抗變化所造成之回授量之變化。因&，能不增加電流檢 測電路用之基板片數，且能高精度檢測出流至放電严之 流。 1 根據本發明之第2及第3技術面，第i檢測電路能檢 測產生於變壓器之f i二次繞組之電壓，藉由電壓檢測值 能用以異常時之保護。 ▲根據本發明之第4技術面’第2檢測電路能檢測產生 於變壓器之第2二次繞組之電壓，藉由電壓檢測值能用以 15 200908802 異常時之保護。 根據本發明之第5技術面，雖利用產生於變壓器之第 2 f次繞組之兩端之電壓，使電流在第2檢測電路流動， 但該電流不在第2電流檢測電路流動。亦即，由於第2電 流檢測電路係檢測從流至變壓器之第2二次繞組之電流中 去掉流至第2檢測電路之電流，因此，能控制由於放電燈 之阻抗變化所造成之回授量之變化。因此，能不增加電流 (檢測電路用之基板片數’且能高精度檢測流至放電燈之電 流。 根據本發明之第6及第7技術面，第2檢測電路能檢 ㈣壓H之第2二次繞組所產生之電壓’藉由電壓檢測值 能用以異常時之保護。 (美國指定） 本國際專利申請係有關於美國指定，針對2007年7月 所申》a之日本專利申請第2007 — 192490號（2007年7 ( 月4日申叫），根據美國專利法第119條（a)，援用優先權 之利皿，引用該揭示内容。 【圖式簡單說明】 圖1係使用關聯之一端高壓系統之放電燈點燈裝置之 電路圖。 圖2係表示將圖1所示之一端高壓系統構裝於面板部 之構成例的圖。 圖3係使用關聯之兩端高壓系統之放電燈點燈裝置之 16 200908802 電路圖。 圖4係表示將圖3所示之兩端高壓系統構裝於面板部 之構成例的圖。 圖5係將電流檢測部設置於變流器部，使用由1片基 板構成之關聯之兩端高壓系統之放電燈點燈裝置之電路 圖。 圖6係表示本發明之實施例丨之放電燈點燈裝置之構 成圖。 圖7係表示本發明之實施例2之放電燈點燈裝置之構 成圖。 圖8係表示本發明之實施例3之放電燈點燈t置之構 成圖。 圖9係表示本發明之實施例4之放電燈點燈裝置之構 成圖。 【主 要元件符號說明： 1 1 放電燈 la、 lb 放電燈 3 電線 11 a， ' lib 電壓檢測電路 20 變流器部 20a 基板 2〇b 基板 30 面板部 17 200908802Between the other end and the ground, a diode φ I circuit connecting the diode D2 and the resistor R1 and a diode D1 connected in parallel to the series circuit, the diode D1 and the resistor R1 constitute the i 200908802 Current detection circuit. Between the other end of the second secondary winding S2 of the transformer Τ1 + λ* ° and the ground, a series circuit of the diode _ to the resistor R2 and a diode EH connected in parallel to the series circuit are used. The diodes D3 and D4 and the resistor R2 constitute a second current detecting circuit. The control circuit is the average of the first lightning flow detection value detected by the first current detecting circuit and the second current detecting value detected by the second positive method and the second current detecting circuit detected by the second detecting method. The current value, 傕兮 + + A ( + + makes the thousand average current value become a predetermined value, and performs PWM control to turn the switch on/off. Use * (the first voltage detection circuit) 11 a detection voltage detection electric valley benefit The voltage across C2 is output to the control circuit (the second voltage detection circuit detects the capacitance of the capacitor) and outputs the detected voltage to the control:: The circuit system judges The first κ.: from the voltage detecting circuit: two: and the second voltage detection value from the voltage detecting circuit 1 lb average = the average voltage value exceeds a predetermined voltage value. That is, the electric 1 la, Ub is used Judging whether a voltage of a battery, a voltage of the group S1, and a voltage of the secondary winding S2 are overvoltage. According to the implementation of the configuration, the lamp is split at the lamp, and the production is performed in a S1 Γ1 - Human environment, and the voltage across the S1, the current circuit of the current 2, S1 extension The diameter (1) is rotated clockwise by two: the needle D::: is flowing. The current of the current path (1) is not turbulent. That is, the first current detecting circuit constituted by the first R1 causes the current P to be detected by the first current detecting circuit. From the flow to the transformer τι之12 200908802 The first-second winding, the current of the group si is removed to the current of the first electric dust detecting circuit composed of the electric capacitor Cj "electric grid C2." The second end of the secondary winding Sl, the current of the secondary winding S1, so that the current flows along the current path (1) extending along S2, C4, C3, and S2 toward the direction of the needle and counterclockwise rotation. The current of the current path (1) does not flow in the second circuit composed of the diodes D3, D4 and the resistor R2. That is, the 帛2 current detecting circuit detects the current from the second secondary winding S2 of the flow AC voltage: The current flowing to the second electric-detection circuit composed of the voltage detector & battery cell C3 and capacitor C4 is removed. Because: 'The change due to the impedance change of the discharge lamps la, 11} can be controlled. Does not increase the number of substrates used in the current detecting circuit, and the accuracy detection of this portion flows to the discharge lamp Further, the voltage detecting circuit 1 la detects the voltage detecting capacitor c2 at both ends of the electric power repeatedly. The voltage detecting circuit 11b detects the electric dust at both ends of the voltage detecting capacitor. The control circuit is when the voltage is applied. The voltage detection value of the detection circuit 11 a is equal to the average value from the voltage detection circuit i! value ##################################################### It is judged that the voltage is abnormal. Embodiment t Fig. 7 shows the discharge lamp point (4) of the second embodiment, and the capacitor for detecting the electric dust. And the voltage between the voltage detection power = point and the ground is reported to the control unit of the electric field C2 and the voltage detection value is turned to the control power 13 200908802 The voltage detection capacitor C3 and the voltage detection capacitor The voltage between the contact of C4 and the ground is output to the control circuit 2 as the second voltage detection value. Briefly, the '帛1 detection circuit detects the first voltage detection value through the first current detection circuit composed of the two-poles D1, D2 and the % resistance state R1. The second detection circuit transmits the diodes D3 and D4. The second current detecting circuit constituted by the resistor R2 detects the second voltage detection value. - According to such a configuration, since the same effect can be obtained as in the effect of the implementation, and the voltage detecting circuits 11a and 11b can be deleted, it is more inexpensive. EMBODIMENT 3 Fig. 8 is a view showing the construction of a discharge lamp lighting device of Embodiment 3 of the present invention. The third embodiment shown in Fig. 8 is a configuration similar to that of the second embodiment shown in Fig. 7, and is characterized in that the second current detecting circuit composed of the diodes D3 and D4 and the resistor R2 can be deleted. That is, it is sometimes possible to perform the % /; 'L detection using only the first current detecting circuit composed of the two i, D1, D2 and the resistor Ri depending on the state of assembly or use. Therefore, the same effects as those of the second embodiment can be obtained even according to the third embodiment. [Embodiment 4] Fig. 9 is a view showing a configuration of a discharge lamp lighting device of Embodiment 4 of the present invention. Embodiment 4 shown in Fig. 9 is structured with respect to Embodiment 3 shown in Fig. 8. The second capacitor detecting circuit is composed of a detecting capacitor c 3 and a voltage measuring device C4. In other words, it is also possible to perform voltage detection using only the first circuit composed of the electric power supply capacitor C2 and the voltage detecting capacitor C2 according to the assembly state or use of the assembly. Therefore, the same effects as those of the third embodiment can be obtained even according to the fourth embodiment. The description is not limited to the discharge lamp lighting devices of the first to fourth embodiments. In the first to fourth embodiments of FIGS. 6 to 9, although the discharge lamp is two lamps, the discharge lamp may be a lamp... Combination Example] to Example 4: Compositions. For example, in Figs. 8 and 9, a voltage detecting circuit Ua for detecting electric dust at both ends of the voltage detecting capacitor C1 or the voltage detecting capacitor C2 may be provided. Further, in Fig. 8, a voltage detecting circuit 11b for detecting the voltage across the voltage detecting capacitor 11 C3 or the electrical testing capacitor C4 may be provided. According to the first technical aspect of the present invention, the current flows through the ith detection circuit by the voltage ' generated at both ends of the first = secondary winding of the transformer, but the current does not flow in the first current detecting circuit. That is, since the ith current detecting circuit detects that the current flowing to the first detecting circuit is removed from the current flowing to the first secondary winding of the transformer, the feedback amount due to the impedance change of the discharge lamp can be controlled. Change. Since &, the number of substrates for the current detecting circuit can be increased, and the flow to the discharge can be detected with high precision. According to the second and third technical aspects of the present invention, the i-th detecting circuit can detect the voltage of the secondary winding of the f i generated in the transformer, and the voltage detection value can be used for protection at the time of abnormality. ▲ According to the fourth technical aspect of the present invention, the second detecting circuit can detect the voltage generated in the second secondary winding of the transformer, and the voltage detection value can be used for the protection of the abnormality of 200908802. According to the fifth technical aspect of the present invention, the current flows through the second detecting circuit by the voltage generated across the second f-th winding of the transformer, but the current does not flow in the second current detecting circuit. In other words, since the second current detecting circuit detects that the current flowing to the second detecting circuit is removed from the current flowing to the second secondary winding of the transformer, the feedback amount due to the impedance change of the discharge lamp can be controlled. Change. Therefore, it is possible to detect the current flowing to the discharge lamp with high accuracy without increasing the current (the number of substrates for the detection circuit). According to the sixth and seventh technical aspects of the present invention, the second detection circuit can detect (four) the pressure H. 2 The voltage generated by the secondary winding' can be used for the protection of abnormal time by the voltage detection value. (Specified by the United States) This international patent application is related to the US designation, and the Japanese patent application for the July 2007 application 2007 — No. 192490 (2007 7 (Shenzhen 4), according to Article 119(a) of the US Patent Law, the priority of the reference is cited, and the disclosure is cited. [Simplified Schematic] Figure 1 is the use of association Fig. 2 is a view showing a configuration example in which a high-pressure system of one end shown in Fig. 1 is constructed on a panel portion. Fig. 3 is a discharge lamp using a high-voltage system at both ends. Fig. 4 is a view showing an example of a configuration in which the high-voltage systems at both ends shown in Fig. 3 are attached to a panel portion. Fig. 5 shows a current detecting unit provided in a converter unit. Associated with the composition of the substrate Fig. 6 is a view showing the configuration of a discharge lamp lighting device according to an embodiment of the present invention. Fig. 7 is a view showing the configuration of a discharge lamp lighting device according to a second embodiment of the present invention. Fig. 8 is a view showing a configuration of a discharge lamp lighting device according to a third embodiment of the present invention. Fig. 9 is a view showing a configuration of a discharge lamp lighting device according to a fourth embodiment of the present invention. 1 discharge lamp la, lb discharge lamp 3 wire 11 a, ' lib voltage detection circuit 20 converter unit 20a substrate 2 〇 b substrate 30 panel portion 17 200908802
Cl、C2、C3、C4 C5、C6Cl, C2, C3, C4 C5, C6
D1、D2、D3、D4 PI R1、R2 51 52 ΤΙ、T5 電壓檢測用電容器 寄生電容器 二極體 一次繞組 電流檢測用電阻器 第1二次繞組 第2二次繞組 變壓器D1, D2, D3, D4 PI R1, R2 51 52 ΤΙ, T5 Voltage detecting capacitor Parasitic capacitor Diode Primary winding Current detecting resistor 1st secondary winding 2nd secondary winding Transformer
4 184 18