201101935 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種即時時鐘驅動電路❶ [先前技術] [0002] 先前之許多電子裝置都會附屬一時鐘計時之功能，以增 加其使用上之便利。目前普遍使用之數位相機、手機、 PDA都需要一即時時鐘積體電路之配合，以便在上述之電 子裝置關閉主電源後，讓即時時鐘積體電路繼續維持計 時運作，再次開機時，即時時鐘積體電路即可立即地供 ^ 應正確之計時時間。 [0003] 數位相機之即時時鐘積體電路主要包括一即時時鐘產生 器（Real Time Clock Integrated Circuit，簡稱 RTC 1C)、一主電源及一金電容。主電源閉合時，一邊為 RTC 1C提供電源，—邊為所述金電容疼電。所述數位相 機在更換電池之過程中，主電源關閉，該夺位相機依靠 事先存儲有電能之金電容放電，為所述紙邮供工作 〇 ㈣。然而，金電容價格比較學章且為所述RTC IC提供 電源之時間較短。 【發明内容】 [_ t黎於此，本發明提供一種供電之持續時間長且生產成 本低之即時時鐘驅動電路。 種即時時鐘驅動電路，用於為數位相機之即時時鐘產 生器提供艇動電源。所述即時時鐘驅動電路包括一閃光 燈電路、1關電路及-主電源。所述閃紐電路包括 一變壓器、-閃光燈充電電容及至少-第-分壓電阻 表單編號A0101 098120280 0982034492-0 第5頁/共13頁 201101935 所述開關電路包括一電晶體及一第二分壓電阻。所述主 電源分別電性連接至所述變壓器，電晶體之栅極及即時 時鐘產生器之電源輸入端。所述閃光燈充電電容及至少 一第一分壓電阻之一端分別電性連接至所述變壓器之輸 出端。所述至少一第一分壓電阻之另一端電性連接至所 述電晶體之源極並藉由所述第二分壓電阻電性連接至所 述電晶體之柵極。所述電晶體之漏極電性連接至即時時 鐘產生器之電源輸入端。 [0006] 相較于先前技術，所述主電源斷開時，所述閃光燈充電 電容放電，所述開關電路之電晶體導通，所述閃光燈充 電電容為所述即時時鐘產生器提供工作電壓。因此，無 需再額外增加金電容，降低了生產成本，且閃光燈充電 電容大，可以提供電源之持續時間長。 【實施方式】 [0007] 請參閱圖1，本發明實施方式提供之一種即時時鐘驅動電 路100，用於為數位相機之即時時鐘產生器40提供驅動電 源，其包括一主電源110、閃光燈電路1〇、一開關電路20 、一主供電電路30。 [0008] 本實施方式中，所述主電源11 0為一電池。 [0009] 所述閃光燈電路10包括一變壓器11、至少一第一分壓電 阻12及一閃光燈充電電容C1。所述主電源110與所述變壓 器11之輸入端電性連接。所述變壓器11之輸出端電性連 接至所述閃光燈充電電容C1。所述變壓器11用於輸出一 300V電壓至所述閃光燈充電電容C1，為所述閃光燈充電 電容C1充電。所述閃光燈充電電容C1用於為數位相機之 098120280 表單編號 A0101 第 6 頁/共 13 頁 0982034492-0 201101935 間光燈5G館♦電能。所述閃光燈充電電谷^1另〆端接地 。所述變壓器11與所述閃光燈充電電各C〗之間形成有第 一結點01。本實施方武中，所述至第—分壓電阻12 包括第一電阻R1、一第 電阻R2、一第三電阻κ3、一第 四電阻R4。所述第一電陴R1、第二電aR2、第三電阻R3 及第四電阻R4依次串聯。且第一電阻R〗串聯在所述第一 結點01上。 所述第二電降R2與第二電阻R3之間形成有第 二結點02。 [0010]所述開關電路2〇包括〆電晶體Q、—第三分壓電阻R22、 0 一第二分壓電陴R21、〆第一二極體W及 —延時電容C2。 本實施方式中，所述電晶體Q為一P~M〇S管。電晶體Q之源 極S電性連接至所述第二結點02 ’所述電晶體q之漏極d電 性連接至所述即時時鐘產生器40 (Real Time Clock Integrated Circuit’簡稱RTC ic)之電源輸入端。所 述主電源110藉由所述第一二極體D1電性連接至所述電晶 體Q之柵極G。所述電晶體Q>之柵極G與所述第一二極體D1 3 形成有第三結點03。所述第二分壓電阻R22之一端電性連 接至所述第三結點〇3，另一端接地。所述延時電容C2之 正極電性連接至所述第二結點〇2，負極電性連接至第三 結點03。同樣地，所述第二分壓電阻R21之一端電性連接 至所述第二結點02，另一端電性連接第三結點03。 [0011] 所述主供電電路3〇包括一第*—極體D2及一渡波電容C3 。所述主電源110藉由所述第二二極體D2電性連接至所述 即時時鐘產生器40之電源輸入端。所述第二二極體D2與 所述即時時鐘產生器40之電源輸入端之間形成有一第四 098120280 表單編號 A0101 第 7 真/共 13 頁 0982034492-0 201101935 結點04。所述濾波電容〇2之*^•極連接至所述所述第四結 點04，負極接地。可以理解之係’所述閃光燈電路10、 開關電路20及主供電電路30内之主電源11 0為同一電源， 也即為數位相機之電池。 [0012] 使用時，當數位相機之電池有電’也即所述主電源110有 電時，所述主電源110經變壓器11升壓後之電壓為300V ，為所述閃光燈充電電容C1充電。同時，由於所述主電 源110為開關電路20提供電源’所述主電源110經過第一 二極體D1後提供電壓至所述電晶體Q之柵極G，而第一結 點01之電壓經所述第一電I^Rl、第二電阻R2、第三電阻 R3及第四電阻R4分壓後得到〆小於所述主電源11〇電壓之 電壓，由於栅極G電壓高於源極S電壓，電晶體q截止。所 述即時時鐘產生器4〇之工作電壓由所述主供電電路3〇提 供，具體地，主供電電路30内之主電/尿11〇經第二二極體 D2後為所述即時時鐘產生器40提供工作電壓。 [0013] §數位相機更換電池時，也即所述主電源11〇沒有電時， 主電源110之電祕GV，此時，閃先燈充電電容π開始放 電，經第一電隨、第二電阻R2、第三電阻淑第四電 阻R4分壓後，在所述第二結點〇2得到—電壓yi。本實施 方式中，所述電壓VI為3V左右。此眛泰拓们 1 此得’電壓VI施加在至 電晶體Q源極S ,且該電壓VI經第二公麻 布一刀壓電阻R21分壓後施 加至電晶體Q之栅極G，所述柵極G得到_G 3v左右之電壓 ’由於柵極G電壓低於源極s電壓，叱、x、 所4電晶體Q導通《此 時’所述即時時鐘產生器4〇之工作 卜電墨由所述閃光燈充 電電容C1提供。 098120280 表單編號Α0101 第8頁/共13頁 0982034492-0 201101935 [0014] 所述主電源斷開時，所述閃光燈充電電容放電，所述開 關電路之電晶體導通，所述閃光燈充電電容為所述即時 時鐘產生器提供工作電壓。因此，無需再額外增加金電 容，降低了生產成本，且閃光燈充電電容大，可以提供 電源之持續時間長。 [0015] 综上所述，本發明確已符合發明專利之要件，遂依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，自不能以此限制本案之申請專利範圍。舉凡熟悉本 案技藝之人士援依本發明之精神所作之等效修飾或變化 〇 ，皆應涵蓋於以下申請專利範圍.内。 【圖式簡單說明】 [0016] 圖1為本發明實施方式提供之即時時鐘驅動電路之電路圖 〇 [0017] 〇 【主要元件符號說明】 即時時鐘驅動 100 閃光燈電路 10 電路 開關電路 20 主供電電路 30 即時時鐘產生 40 變壓器 11 器 閃光燈 50 第一結點 01 第二結點. 02 第三結點 03 第四結點 04 主電源 110 第一電阻 R1 第二電阻 R2 第三電阻 R3 第四電阻 R4 閃光燈充電電 C1 電晶體 Q 表單編號A0101 第9頁/共13頁 0982034492-0 098120280 201101935 容 拇極 G 源極 S 漏極 D 延時電容 C2 第二分壓電阻 R21 第三分壓電阻 R22 第一二極體 D1 第二二極體 D2 濾波電容 C3 第一分壓電阻 12 098120280 表單編號A0101 第10頁/共13頁 0982034492-0201101935 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to an instant clock driving circuit [Prior Art] [0002] Many of the prior electronic devices are attached to a clock timing function to increase their use. Convenience. Digital cameras, mobile phones, and PDAs that are commonly used today require an instant clock integrated circuit to allow the instant clock integrated circuit to continue to maintain timing after the electronic device is turned off. When the power is turned on again, the instantaneous clock product The body circuit can be immediately supplied with the correct timing. [0003] The real-time clock integrated circuit of a digital camera mainly includes a Real Time Clock Integrated Circuit (RTC 1C), a main power supply, and a gold capacitor. When the main power is turned off, one side supplies power to the RTC 1C, and the gold capacitor is in pain. During the replacement of the battery by the digital camera, the main power is turned off, and the capture camera relies on a gold capacitor that stores electrical energy in advance to work for the paper (4). However, the price of the gold capacitor is relatively short and the time for supplying power to the RTC IC is short. SUMMARY OF THE INVENTION The present invention provides an instant clock driving circuit with a long duration of power supply and low production cost. An instant clock drive circuit for providing boat power to an instant clock generator for a digital camera. The instant clock driving circuit includes a flash circuit, a shutdown circuit, and a main power supply. The flash circuit includes a transformer, a flash charging capacitor and at least a - first-dividing resistor form number A0101 098120280 0982034492-0 page 5 / 13 pages 201101935 The switching circuit comprises a transistor and a second partial voltage resistance. The main power source is electrically connected to the transformer, the gate of the transistor and the power input end of the instant clock generator. The flash charging capacitor and one of the at least one first voltage dividing resistor are electrically connected to the output end of the transformer, respectively. The other end of the at least one first voltage dividing resistor is electrically connected to the source of the transistor and is electrically connected to the gate of the transistor by the second voltage dividing resistor. The drain of the transistor is electrically coupled to the power input of the instant clock generator. [0006] Compared to the prior art, when the main power is turned off, the flash charging capacitor is discharged, the transistor of the switching circuit is turned on, and the flash charging capacitor provides an operating voltage to the instant clock generator. Therefore, there is no need to add additional gold capacitors, which reduces the production cost, and the flash charging capacitor is large, which can provide a long duration of power supply. [0007] Referring to FIG. 1 , an embodiment of the present invention provides an instant clock driving circuit 100 for providing a driving power to an instant clock generator 40 of a digital camera, which includes a main power source 110 and a flash circuit 1 A switch circuit 20 and a main power supply circuit 30. In the embodiment, the main power source 110 is a battery. The flash circuit 10 includes a transformer 11, at least a first divided piezoelectric resistor 12, and a flash charging capacitor C1. The main power source 110 is electrically connected to an input end of the transformer 11. The output of the transformer 11 is electrically connected to the flash charging capacitor C1. The transformer 11 is for outputting a voltage of 300V to the flash charging capacitor C1 to charge the flash charging capacitor C1. The flash charging capacitor C1 is used for the digital camera 098120280 Form No. A0101 Page 6 of 13 0982034492-0 201101935 Inter-light 5G Pavilion ♦ Energy. The flash charging electric grid is connected to the ground. A first node 01 is formed between the transformer 11 and the flash charging power C. In the present embodiment, the to-divider-divider resistor 12 includes a first resistor R1, a first resistor R2, a third resistor κ3, and a fourth resistor R4. The first electric pole R1, the second electric aR2, the third electric resistance R3, and the fourth electric resistance R4 are sequentially connected in series. And the first resistor R is connected in series to the first node 01. A second node 02 is formed between the second voltage drop R2 and the second resistor R3. [0010] The switch circuit 2A includes a germanium transistor Q, a third voltage dividing resistor R22, a second voltage dividing transistor R21, a first diode body W, and a time delay capacitor C2. In this embodiment, the transistor Q is a P~M〇S tube. The source S of the transistor Q is electrically connected to the second node 02'. The drain d of the transistor q is electrically connected to the real time clock integrated circuit (RTC ic). The power input. The main power source 110 is electrically connected to the gate G of the electro-crystal Q by the first diode D1. The gate G of the transistor Q> and the first diode D1 3 form a third node 03. One end of the second voltage dividing resistor R22 is electrically connected to the third node 〇3, and the other end is grounded. The anode of the time delay capacitor C2 is electrically connected to the second node 〇2, and the cathode is electrically connected to the third node 03. Similarly, one end of the second voltage dividing resistor R21 is electrically connected to the second node 02, and the other end is electrically connected to the third node 03. [0011] The main power supply circuit 3A includes a *-pole body D2 and a wave capacitor C3. The main power source 110 is electrically connected to the power input end of the instant clock generator 40 by the second diode D2. A fourth 098120280 form number A0101 7th true/common 13 page 0982034492-0 201101935 node 04 is formed between the second diode D2 and the power input end of the instant clock generator 40. The filter capacitor 〇2 is connected to the fourth node 04, and the negative electrode is grounded. It can be understood that the flash power circuit 10, the switch circuit 20 and the main power supply 110 in the main power supply circuit 30 are the same power source, that is, the battery of the digital camera. [0012] When in use, when the battery of the digital camera is powered, that is, when the main power source 110 is powered, the voltage of the main power source 110 boosted by the transformer 11 is 300V, and the flash charging capacitor C1 is charged. At the same time, since the main power source 110 supplies power to the switch circuit 20, the main power source 110 supplies a voltage to the gate G of the transistor Q after passing through the first diode D1, and the voltage of the first node 01 passes through The first electric I, the second resistor R2, the third resistor R3, and the fourth resistor R4 are divided to obtain a voltage lower than the voltage of the main power source 11 ,, because the gate G voltage is higher than the source S voltage. , the transistor q is cut off. The operating voltage of the instant clock generator 4 is provided by the main power supply circuit 3〇. Specifically, the main power/urine 11 in the main power supply circuit 30 is generated by the second diode D2 for the instant clock. The device 40 provides an operating voltage. [0013] § When the digital camera replaces the battery, that is, when the main power source 11〇 is not powered, the main power source 110 is the secret GV. At this time, the flashing lamp charging capacitor π starts to discharge, and the first electric power follows, the second electric After the resistor R2 and the third resistor are divided by the fourth resistor R4, a voltage yi is obtained at the second node 〇2. In the present embodiment, the voltage VI is about 3V. In this case, the voltage VI is applied to the source Q of the transistor Q, and the voltage VI is applied to the gate G of the transistor Q after being divided by the second burlap resistor R21. The pole G obtains a voltage of about _G 3v. Since the voltage of the gate G is lower than the voltage of the source s, 叱, x, and the fourth transistor Q are turned on, "the instant clock generator 4" is operated by the ink The flash charging capacitor C1 is provided. 098120280 Form No. 1010101 Page 8 of 13 0982034492-0 201101935 [0014] When the main power is turned off, the flash charging capacitor is discharged, the transistor of the switching circuit is turned on, and the flash charging capacitor is The instant clock generator provides the operating voltage. Therefore, there is no need to add additional gold capacitors, the production cost is reduced, and the flash charging capacitor is large, which can provide a long duration of power supply. [0015] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0016] FIG. 1 is a circuit diagram of an instant clock driving circuit according to an embodiment of the present invention. [0017] 〇 [Main component symbol description] Instant clock driving 100 Flash circuit 10 Circuit switching circuit 20 Main power supply circuit 30 Instant clock generation 40 Transformer 11 Flash 50 First node 01 Second node. 02 Third node 03 Fourth node 04 Main power supply 110 First resistor R1 Second resistor R2 Third resistor R3 Fourth resistor R4 Flash Charging C1 Transistor Q Form No. A0101 Page 9/13 Page 0982034492-0 098120280 201101935 Capacitance G Source S Drain D Delay Capacitor C2 Second Voltage Resistor R21 Third Divider R22 First Dipole Body D1 Second Diode D2 Filter Capacitor C3 First Voltage Divider 12 098120280 Form No. A0101 Page 10 of 13 0982034942-0