200931153 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種控制技術，尤其涉及一種應用於數位 * 相機之閃光燈控制電路。 【先前技術】 • 於數位相機中，閃光燈裝置閃光通常利用充電電路對 閃光燈之儲能電容充電，然後利用觸發電路於閃光燈之燈 管（flash tube)之觸發極施加使閃光燈管發光之觸發高壓， 〇 並藉由儲能電容放電以使閃光燈管發光。隨著數位相機向 小型化發展，閃光燈管尺寸也要求越來越小。為保證閃光 燈之發光強度，燈管内部通常需要更高之氙氣壓力（密 度），燈管發光所需之觸發電壓隨之提高，常規之電路無法 觸發閃光燈管發光。 然而，由於觸發電路之觸發變壓器之設計受到體積之 限制而設計為細長形，導致空氣磁路變長，效率變低，次 Q 級線圈輸出電壓無法有效提升，則無法使燈管正常發光。 同時觸發高壓為交變電壓，提升觸發高壓會引起高壓跳 電，影響閃光燈裝置之穩定性。 【發明内容】 有鑒於此，有必要提供一種能使閃光燈之閃光燈管正 常發光且性能穩定之閃光燈控制電路。 一種閃光燈控制電路，用於控制一燈管發光。燈管具 有一觸發極。所述閃光燈控制電路包括一充電電路及一觸 發電路。所述充電電路包括一儲能電容及一充電電容。所 200931153 述充電電路藉由接收一第一充電電壓對所述儲能電容充 ^ 電，並接收一第二充電電壓對所述充電電容充電。若所述 觸發電路從外部接收一觸發訊號，則所述儲能電容與所述 充電電容分別於所述燈管之兩端形成電壓。所述觸發電路 • 於所述燈管之觸發極產生之觸發電壓與所述燈管之兩端形 成之電壓同時觸發所述燈管導通以使所述燈管發光。 相較於先前技術，所述之閃光燈控制電路之充電電路 0分別接收第一充電電壓及第二充電電壓對儲能電容及充電 電容充電。觸發電路接收觸發訊號後，所述觸發電路於所 述燈管之觸發極產生觸發電壓及所述充電電路於燈管之兩 端產生之電壓使燈管之陽極與陰極導通以使其發光。所述 之閃光燈控制電路利用充電電路接收第二充電電壓提高了 燈管兩端之電壓，使閃光燈能穩定發光。 【實施方式】 下面將結合附圖對本發明實施方式作進一步之詳細 ❹說明。 請參閱圖1，其為本發明第一實施方式之閃光燈控制 電路100,其用於控制一閃光燈10發光。閃光燈控制電路 100包括一充電電路20及一觸發電路40。所述充電電路 20用於對閃光燈10充電。所述觸發電路40用於對閃光燈 10提供觸發電壓。 所述閃光燈10包括一燈管12及一儲能電容C1。燈管 12具有一陽極124、一陰極126及觸發電極128。觸發電 極128塗於燈管12之表面。燈管12内充有氙氣，氙氣於 200931153 高壓下電離形成低阻抗以使燈管12之陽極124與陰極126 . 導通。儲能電容C1之一端與燈管12之陽極124相連，儲 能電容C1之另一端接地。 充電電路20包括一第一整流二極體D1、一第二整流 • 二極體D2、一充電電容C2、一第一限流電阻R1、一第二 * 限流電阻R2及一第三限流電阻R3。第一整流二極體D1 之正極連接至一第一充電端S1用於從外部接收一第一充 ❹電電壓，第一整流二極體D1之負極分別與第一限流電阻 R1之一端及閃光燈10之燈管12之陽極124相連。第二整 流二極體D2之正極連接至一第二充電端S2用於從外部接 收一第二充電電壓。第二限流電阻R2之兩端分別接至第 二整流二極體D2之負極及充電電容C2之一端之間。充電 電容C2之另一端與燈管12之陰極126相連。第三限流電 阻R3之一端與燈管12之陰極126相連，第三限流電阻 R3之另一端與儲能電容C1接地之一端相連共同接地。 © 觸發電路40包括一晶體三極體Q1、一絕緣柵雙極電 晶體Q2、一二極體D3、一觸發電容C3、一變壓器T及電 阻R4、R5。變壓器T包括一初級線圈L1及一次級線圈 L2。本實施方式中，設定初級線圈L1與次級線圈L2之變 壓比為1 : 20。所述晶體三極體Q1之基極經電阻R4與所 述絕緣栅雙極電晶體Q2之柵極相連並共同連接至一觸發 訊號端S3用於從外部接收一觸發訊號。於用戶按下拍照 按鈕後，數位相機内之數位處理器藉由判斷需要閃光時發 出之訊號即為觸發電路40之觸發訊號。晶體三極體Q1之 200931153 基極經電阻R 5與晶體三極體Q1之發射極相連且晶體三極 . 體Q1之發射極接地。晶體三極體Q1之集電極連接至充電 電路20之第二限流電阻R2與充電電容C2之間。絕緣柵 雙極電晶體Q2之集電極與二極體D3之負極相連。同時絕 緣柵雙極電晶體Q2之集電極與第一整流二極體D1之負極 之間串聯連接第一限流電阻R1。觸發電容C3串聯連接於 絕緣柵雙極電晶體Q2之集電極與變壓器T之初級線圈L1 ❹之一端之間。初級線圈L1之另一端接地。次級線圈L2之 一端與燈管12之觸發極128相連，次級線圈L2之另一端 接地。二極體D3之正極與燈管12之陰極126相連。 本實施方式中，充電電路20中之第一整流二極體D1 藉由第一充電端S1接收第一充電電壓並將交流電整流為 直流電對閃光燈10之儲能電容C1充電以於其兩端形成電 壓U1。同時第一整流二極體D1、第一限流電阻R1及觸 發電容C3所形成之充電回路對觸發電容C3充電以於其兩 ©端形成電壓U2。 第二整流二極體D2藉由第二充電端S2接收第二充電 電壓並將交流電整流為直流電。第二整流二極體D2、第二 限流電阻R2、充電電容C2及第三限流電阻R3所形成之 充電回路對充電電容C2充電以於其兩端形成電壓U3。本 實施方式中，第二充電電壓單獨設計以提供1-2千伏特之 高壓，即U3之電壓值可達到1-2千伏特。 晶體三極體Q1接收觸發訊號端S3之觸發訊號導通 後，充電電容C2之一端經晶體三極體Q1之集電極接地於 200931153 燈管12之陰極126形成瞬間負電壓，即_U3。儲能電容以 •之一端接地，儲能電容C1之另—端於燈管12之陽極124 .形成正電壓，即υι。則燈管12之陽極124與陰極126之 間瞬，疊加之電壓U12=U1_(_U3)=U1+U3。變壓器τ與觸 發電谷C3形成振盪回路，觸發電容C3之電壓為U2，且 初級線圈Ll與次級線圈L2之變壓比為1 : 2G，則次級線 圈L2產生瞬間觸發高壓20XU2。此時燈管12於次級線圈 ❹L2產生瞬間觸發高壓20xU2與燈管12之陽極124與陰極 111間之瞬間疊加電壓U12之共同作用下，燈管12内之 導形成低阻抗以使燈管12之陽極124與陰極126 。此後儲能電容cn持續對燈管12放電以使燈管12 發光。 Ο 200复閱圖2，其為第二實施方式之閃光燈控制電路 S3會接用於具有預閃功能之電子裳置中，即觸發訊號端 行一次欠預閃觸發訊號及主閃觸發訊號以觸發閃光燈進 方式之員閃及一次主閃。閃光燈控制電路200與第一實施 答:-」光燈控制電路基本相同，不同之處在於第二 負極及晶體三極體Q1之發射極之間連接 不再贅述電容C4’其他結構與第—實施方式相同，於此 電容C2之^方式中輔助充電電容C4之電容值大於充電 電電容c電谷值以使輔助充電電容C4之充電電壓大於充 C2充電。之充電電壓便於輔助充電電容C4為充電電容 ;第一充電電壓端S2接收第二充電電壓並將交 200931153 流電整流為直流電對輔助充電電容C4充電以使其兩端形 成電壓U4。 觸發訊號端S3接收預閃觸發訊號使燈管12發光結東 後，充電電容C2放電結束。由於預閃觸發訊號與主閃觸 發訊號間隔時間很紐，第二充電電壓端S2無法再次對充 電電容C2充電。此時利用輔助充電電容C4與第二限流電 阻R2、充電電容C2、第三限流電阻R3所形成之回路對充 ❾電電容C2充電，充電電容C2之兩端又具有電壓us,且 U5=U4。儲能電容C1於預閃後仍有—電壓u6，且電壓说 小於U1，即U6<U1。此時觸發電容C3仍有一電壓， 且 U7=U6。 於觸發訊號端S3接收主閃觸發訊號時，充電電容c2 之一端經晶體三極體Q1之集電極接地於燈管12之陰極 126形成瞬間負電壓，即-U5。儲能電容C1之一端接地， 儲能電容C1之另一端於燈管12之陽極124形成正電壓， 〇 即U6。則燈管12之陽極124與陰極126之間之瞬間疊加 電壓U14=U6-(-U5)=U6+U5。燈管12之觸發極128於次級 線圈L2產生之瞬間觸發高壓20U7與燈管12之陽極124 與陰極126之間之瞬間疊加電壓U14之共同作用下，燈管 12内之氙氣電離形成低阻抗以使燈管12之陽極124與陰 極126導通。此後儲能電容C1持續對燈管12放電以使燈 管12再次發光。 可以理解，若藉由閃光燈控制電路獲得之燈管12之 陽極124與陰極126之電壓差可達到燈管12之自閃電壓， 11 200931153 ， 則無需變壓器T與觸發電容C3振盪以產生瞬間觸發高壓 •即可使燈管12發光。此時可去掉變壓器τ及觸發電容C3 以節省成本。 相較於先前技術’所述之閃光燈控制電路之充電電路 藉由第一充電端及第二充電端分別接收第一充電電壓及第 一充電電壓對儲能電谷及充電電容充電。觸發電路接收觸 發訊號後，所述觸發電路於所述燈管之觸發極產生觸發電 〇壓’同％儲能電容於所述燈管之陽極產生正電壓及充電電 容於燈管陰極產生負電壓使燈管之陽極與陰極之間之電壓 差加大，並與觸發電壓共同作用使燈管之陽極與陰極導通 以使其發光。所述之閃光燈控制電路利用充電電路接收第 二充電電壓提高了燈管之陽極與陰極之間之電壓，使閃光 燈能穩定發光。 綜上所述，本發明確已符合發明專利要件，鲁 利申請。惟，以上所述者僅為本發明之較佳實施方式，舉凡熟 Ο心本案技i*之人士’於援依本案發明精神所作之等效修飾或變 化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 圖1為本發明之第-實施方式之閃光燈控制電路之電 路圖。 圖2為本發明之第二實施方式之閃光燈㈣電路之電 路圖。 【主要組件符號說明】 閃光燈控制電路1〇〇 閃光燈 i n 12 200931153 充電電路 20 觸發電路 40 燈管 12 陽極 124 陰極 126 觸發極 128 晶體三極體 Q1 絕緣柵雙極電晶體 Q2 第一整流二極體' D1 第二整流二極體 D2 二極體 D3 儲能電容 C1 充電電容 C2 觸發電容 C3 第一限流電阻 R1 第二限流電阻 R2 第三限流電阻 R3 電阻 R4、R5 第一充電端 S1 第二充電端 S2 觸發訊號端 S3 變壓器 Τ 初級線圈 L1 次級線圈 L2 輔助充電電容 C4 〇 13200931153 IX. Description of the Invention: [Technical Field] The present invention relates to a control technique, and more particularly to a flash control circuit applied to a digital camera. [Prior Art] • In a digital camera, the flash unit flash usually uses a charging circuit to charge the storage capacitor of the flash, and then uses a trigger circuit to apply a trigger high voltage to the flash tube to the trigger of the flash tube. The 闪光灯 is discharged by the storage capacitor to cause the flash tube to emit light. As digital cameras have become smaller, the size of flash tubes has also become smaller and smaller. In order to ensure the luminous intensity of the flash lamp, a higher helium pressure (density) is usually required inside the lamp tube, and the trigger voltage required for the lamp to emit light is increased, and the conventional circuit cannot trigger the flash tube to emit light. However, since the design of the trigger circuit of the trigger circuit is limited in size and is designed to be elongated, the air magnetic path becomes long and the efficiency is low, and the output voltage of the sub-Q stage coil cannot be effectively increased, so that the lamp cannot be normally illuminated. At the same time, the high voltage is triggered as the alternating voltage, and the high voltage is triggered to cause high voltage jump, which affects the stability of the flash unit. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a flash control circuit that enables a flash lamp of a flash to be normally illuminated and has stable performance. A flash control circuit for controlling the illumination of a tube. The lamp has a trigger pole. The flash control circuit includes a charging circuit and a trigger circuit. The charging circuit includes a storage capacitor and a charging capacitor. The charging circuit of claim 200931 charges the storage capacitor by receiving a first charging voltage and receives a second charging voltage to charge the charging capacitor. If the trigger circuit receives a trigger signal from the outside, the storage capacitor and the charging capacitor respectively form a voltage across the lamp. The trigger circuit triggers the lamp to conduct at the same time as the trigger voltage generated by the trigger pole of the lamp tube and the voltage formed at both ends of the lamp tube to cause the lamp tube to emit light. Compared with the prior art, the charging circuit 0 of the flash control circuit receives the first charging voltage and the second charging voltage to charge the storage capacitor and the charging capacitor, respectively. After the trigger circuit receives the trigger signal, the trigger circuit generates a trigger voltage at the trigger pole of the lamp tube and a voltage generated by the charging circuit at both ends of the lamp tube to turn on the anode and the cathode of the lamp tube to cause the light to be emitted. The flash control circuit uses the charging circuit to receive the second charging voltage to increase the voltage across the lamp, so that the flash can stably emit light. [Embodiment] Hereinafter, embodiments of the present invention will be further described in detail with reference to the accompanying drawings. Please refer to FIG. 1, which is a flash control circuit 100 according to a first embodiment of the present invention for controlling a flash 10 to emit light. The flash control circuit 100 includes a charging circuit 20 and a trigger circuit 40. The charging circuit 20 is for charging the flash lamp 10. The trigger circuit 40 is for providing a trigger voltage to the flash lamp 10. The flash lamp 10 includes a lamp tube 12 and a storage capacitor C1. The tube 12 has an anode 124, a cathode 126 and a trigger electrode 128. The trigger electrode 128 is applied to the surface of the bulb 12. The lamp tube 12 is filled with helium gas, and the helium gas is ionized under high pressure at 200931153 to form a low impedance to turn on the anode 124 and the cathode 126 of the lamp tube 12. One end of the storage capacitor C1 is connected to the anode 124 of the bulb 12, and the other end of the storage capacitor C1 is grounded. The charging circuit 20 includes a first rectifying diode D1, a second rectifying diode 2, a charging capacitor C2, a first current limiting resistor R1, a second current limiting resistor R2, and a third current limiting circuit. Resistor R3. The anode of the first rectifying diode D1 is connected to a first charging terminal S1 for receiving a first charging voltage from the outside, and the cathode of the first rectifying diode D1 is respectively connected to one end of the first current limiting resistor R1. The anode 124 of the lamp tube 12 of the flash lamp 10 is connected. The anode of the second rectifying diode D2 is connected to a second charging terminal S2 for receiving a second charging voltage from the outside. The two ends of the second current limiting resistor R2 are respectively connected between the negative terminal of the second rectifying diode D2 and one end of the charging capacitor C2. The other end of the charging capacitor C2 is connected to the cathode 126 of the bulb 12. One end of the third current limiting resistor R3 is connected to the cathode 126 of the lamp tube 12, and the other end of the third current limiting resistor R3 is connected to one end of the grounding of the storage capacitor C1 to be grounded. The trigger circuit 40 includes a crystal triode Q1, an insulated gate bipolar transistor Q2, a diode D3, a trigger capacitor C3, a transformer T, and resistors R4 and R5. The transformer T includes a primary coil L1 and a primary coil L2. In the present embodiment, the transformation ratio of the primary coil L1 and the secondary coil L2 is set to 1:20. The base of the crystal triode Q1 is connected to the gate of the insulated gate bipolar transistor Q2 via a resistor R4 and is commonly connected to a trigger signal terminal S3 for receiving a trigger signal from the outside. After the user presses the camera button, the digital processor in the digital camera is the trigger signal of the trigger circuit 40 by judging that the signal that needs to be flashed is generated. The base of 200931153 of the crystal triode Q1 is connected to the emitter of the crystal triode Q1 via a resistor R 5 and the crystal is three poles. The emitter of the body Q1 is grounded. The collector of the crystal transistor Q1 is connected between the second current limiting resistor R2 of the charging circuit 20 and the charging capacitor C2. Insulated Gate The collector of the bipolar transistor Q2 is connected to the cathode of the diode D3. At the same time, the first current limiting resistor R1 is connected in series between the collector of the insulated gate bipolar transistor Q2 and the cathode of the first rectifying diode D1. The trigger capacitor C3 is connected in series between the collector of the insulated gate bipolar transistor Q2 and one of the primary windings L1 of the transformer T. The other end of the primary coil L1 is grounded. One end of the secondary coil L2 is connected to the trigger pole 128 of the bulb 12, and the other end of the secondary coil L2 is grounded. The anode of the diode D3 is connected to the cathode 126 of the bulb 12. In this embodiment, the first rectifying diode D1 in the charging circuit 20 receives the first charging voltage by the first charging terminal S1 and rectifies the alternating current into a direct current to charge the storage capacitor C1 of the flash lamp 10 to form at both ends thereof. Voltage U1. At the same time, the charging circuit formed by the first rectifying diode D1, the first current limiting resistor R1 and the triggering capacitor C3 charges the trigger capacitor C3 to form a voltage U2 at the two terminals thereof. The second rectifying diode D2 receives the second charging voltage through the second charging terminal S2 and rectifies the alternating current into direct current. The charging circuit formed by the second rectifying diode D2, the second current limiting resistor R2, the charging capacitor C2 and the third current limiting resistor R3 charges the charging capacitor C2 to form a voltage U3 at both ends thereof. In this embodiment, the second charging voltage is separately designed to provide a high voltage of 1-2 kV, that is, the voltage value of U3 can reach 1-2 kV. After the triode Q1 receives the trigger signal of the trigger signal terminal S3, one end of the charging capacitor C2 is grounded through the collector of the crystal triode Q1 to the cathode 126 of the lamp 12 of 200931153 to form an instantaneous negative voltage, that is, _U3. The storage capacitor is grounded at one end, and the other end of the storage capacitor C1 is connected to the anode 124 of the bulb 12. A positive voltage is formed, that is, υι. Then, between the anode 124 and the cathode 126 of the lamp tube 12, the superposed voltage U12=U1_(_U3)=U1+U3. The transformer τ forms an oscillating circuit with the contact power generation valley C3, the voltage of the trigger capacitor C3 is U2, and the transformation ratio of the primary coil L1 and the secondary coil L2 is 1: 2G, and the secondary coil L2 generates an instantaneous trigger high voltage 20XU2. At this time, the lamp tube 12 generates a low impedance to the lamp 12 in the secondary coil ❹L2, which generates an instantaneously triggered high voltage 20xU2 and an instantaneous superimposed voltage U12 between the anode 124 and the cathode 111 of the lamp tube 12. The anode 124 and the cathode 126. Thereafter, the storage capacitor cn continues to discharge the bulb 12 to cause the bulb 12 to emit light. Ο 200 reviewing FIG. 2, which is the flash control circuit S3 of the second embodiment is used in the electronic skirt with the pre-flash function, that is, the trigger signal end-line one-time under-pre-flash trigger signal and the main flash trigger signal are triggered. The flashing mode member flashes and a main flash. The flash control circuit 200 is basically the same as the first implementation of the ":" light control circuit, except that the connection between the second negative electrode and the emitter of the crystal triode Q1 is no longer described in the capacitor C4'. In the same manner, in the mode of the capacitor C2, the capacitance value of the auxiliary charging capacitor C4 is greater than the charging capacitor c. The charging voltage of the auxiliary charging capacitor C4 is greater than the charging C2 charging. The charging voltage facilitates the auxiliary charging capacitor C4 as a charging capacitor; the first charging voltage terminal S2 receives the second charging voltage and rectifies the current to 200931153 to charge the auxiliary charging capacitor C4 to form a voltage U4 at both ends thereof. After the trigger signal terminal S3 receives the pre-flash trigger signal to cause the lamp 12 to emit light, the charging capacitor C2 is discharged. Since the interval between the pre-flash trigger signal and the main flash signal is very high, the second charging voltage terminal S2 cannot charge the charging capacitor C2 again. At this time, the circuit formed by the auxiliary charging capacitor C4 and the second current limiting resistor R2, the charging capacitor C2, and the third current limiting resistor R3 charges the charging capacitor C2, and both ends of the charging capacitor C2 have a voltage us, and U5 =U4. The storage capacitor C1 still has a voltage u6 after the pre-flash, and the voltage is said to be smaller than U1, that is, U6 < U1. At this time, the trigger capacitor C3 still has a voltage, and U7=U6. When the trigger signal terminal S3 receives the main flash trigger signal, one end of the charging capacitor c2 is grounded to the cathode 126 of the lamp tube 12 via the collector of the crystal triode Q1 to form an instantaneous negative voltage, that is, -U5. One end of the storage capacitor C1 is grounded, and the other end of the storage capacitor C1 forms a positive voltage at the anode 124 of the bulb 12, that is, U6. Then, the instantaneous voltage between the anode 124 and the cathode 126 of the lamp tube 12 is superposed. The voltage U14=U6-(-U5)=U6+U5. The trigger pole 128 of the lamp tube 12 triggers the high voltage 20U7 at the moment of the generation of the secondary coil L2 and the instantaneous superposition voltage U14 between the anode 124 and the cathode 126 of the lamp tube 12, and the helium ionization in the lamp tube 12 forms a low impedance. The anode 124 of the bulb 12 is electrically connected to the cathode 126. Thereafter, the storage capacitor C1 continues to discharge the bulb 12 to cause the bulb 12 to illuminate again. It can be understood that if the voltage difference between the anode 124 and the cathode 126 of the lamp tube 12 obtained by the flash control circuit can reach the self-flash voltage of the lamp 12, 11 200931153, the transformer T and the trigger capacitor C3 are not required to oscillate to generate an instantaneous trigger high voltage. • The lamp 12 can be illuminated. At this time, the transformer τ and the trigger capacitor C3 can be removed to save costs. The charging circuit of the flash control circuit of the prior art has received the first charging voltage and the first charging voltage to charge the energy storage valley and the charging capacitor by the first charging terminal and the second charging terminal, respectively. After the trigger circuit receives the trigger signal, the trigger circuit generates a trigger voltage at the trigger pole of the lamp tube. The same value of the storage capacitor generates a positive voltage at the anode of the lamp tube and the charging capacitor generates a negative voltage at the cathode of the lamp tube. The voltage difference between the anode and the cathode of the lamp is increased, and the trigger voltage is used to make the anode and cathode of the lamp conduct to emit light. The flash control circuit uses the charging circuit to receive the second charging voltage to increase the voltage between the anode and the cathode of the lamp, so that the flash lamp can stably emit light. In summary, the present invention has indeed met the requirements of the invention patent, and Luli applied. However, the above description is only a preferred embodiment of the present invention, and equivalent modifications or changes made by those who are familiar with the present invention in the spirit of the invention shall be included in the following patent application scope. Inside. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram of a flash control circuit according to a first embodiment of the present invention. Fig. 2 is a circuit diagram of a flash (four) circuit of a second embodiment of the present invention. [Main component symbol description] Flash control circuit 1 〇〇 flash lamp in 12 200931153 Charging circuit 20 Trigger circuit 40 Lamp 12 Anode 124 Cathode 126 Trigger pole 128 Crystal triode Q1 Insulated gate bipolar transistor Q2 First rectifying diode ' D1 Second rectifier diode D2 Diode D3 Storage capacitor C1 Charging capacitor C2 Trigger capacitor C3 First current limiting resistor R1 Second current limiting resistor R2 Third current limiting resistor R3 Resistor R4, R5 First charging terminal S1 The second charging terminal S2 triggers the signal terminal S3 transformer Τ primary coil L1 secondary coil L2 auxiliary charging capacitor C4 〇 13