TWI407840B - Real time clock driving circuit - Google Patents
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Abstract
Description
本發明涉及一種即時時鐘驅動電路。 The invention relates to an instant clock driving circuit.
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。 Many of the previous electronic devices have a clock timing function to increase their 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 immediately supply the correct timing.
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 IC)、一主電源及一金電容。主電源閉合時,一邊為RTC IC提供電源,一邊為所述金電容充電。所述數位相機在更換電池之過程中,主電源關閉,該數位相機依靠事先存儲有電能之金電容放電,為所述RTC IC提供工作電源。然而,金電容價格比較昂貴且為所述RTC IC提供電源之時間較短。 The real-time clock integrated circuit of the digital camera mainly includes a Real Time Clock Integrated Circuit (RTC IC), a main power supply and a gold capacitor. When the main power is turned off, the gold capacitor is charged while the RTC IC is powered. The digital camera is turned off during the replacement of the battery, and the digital camera is powered by a gold capacitor that stores electrical energy in advance to provide operating power for the RTC IC. However, gold capacitors are relatively expensive and provide less time to power the RTC IC.
有鑒於此,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。 In view of this, the present invention provides an instant clock driving circuit with long power supply duration and low production cost.
一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驅動電源。所述即時時鐘驅動電路包括一閃光燈電路、一開關電路及一主電源。所述閃光燈電路包括一變壓器、一閃光燈充電電容及至少一第一分壓電阻。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,電晶體之柵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。 An instant clock driving circuit for providing driving power to an instant clock generator of a digital camera. The instant clock driving circuit includes a flash circuit, a switching circuit and a main power source. The flash circuit includes a transformer, a flash charging capacitor and at least a first voltage dividing resistor. The switching circuit includes a transistor and a second voltage dividing resistor. 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 connected to the power input of the instant clock generator.
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。 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 for the instant clock generator. 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.
100‧‧‧即時時鐘驅動電路 100‧‧‧ Instant clock drive circuit
10‧‧‧閃光燈電路 10‧‧‧Flash circuit
20‧‧‧開關電路 20‧‧‧Switch circuit
30‧‧‧主供電電路 30‧‧‧Main power supply circuit
40‧‧‧即時時鐘產生器 40‧‧‧ Instant Clock Generator
11‧‧‧變壓器 11‧‧‧Transformers
50‧‧‧閃光燈 50‧‧‧flash
O1‧‧‧第一結點 O1‧‧‧ first node
O2‧‧‧第二結點 O2‧‧‧ second node
O3‧‧‧第三結點 O3‧‧‧ third node
O4‧‧‧第四結點 O4‧‧‧ fourth node
110‧‧‧主電源 110‧‧‧Main power supply
R1‧‧‧第一電阻 R1‧‧‧first resistance
R2‧‧‧第二電阻 R2‧‧‧second resistance
R3‧‧‧第三電阻 R3‧‧‧ third resistor
R4‧‧‧第四電阻 R4‧‧‧fourth resistor
C1‧‧‧閃光燈充電電容 C1‧‧‧Flash charging capacitor
Q‧‧‧電晶體 Q‧‧‧Optocrystal
G‧‧‧柵極 G‧‧‧Gate
S‧‧‧源極 S‧‧‧ source
D‧‧‧漏極 D‧‧‧Drain
C2‧‧‧延時電容 C2‧‧‧Time delay capacitor
R21‧‧‧第二分壓電阻 R21‧‧‧Second voltage divider resistor
R22‧‧‧第三分壓電阻 R22‧‧‧ third voltage divider resistor
D1‧‧‧第一二極體 D1‧‧‧First Diode
D2‧‧‧第二二極體 D2‧‧‧ second diode
C3‧‧‧濾波電容 C3‧‧‧Filter Capacitor
12‧‧‧第一分壓電阻 12‧‧‧First voltage divider resistor
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。 FIG. 1 is a circuit diagram of an instant clock driving circuit according to an embodiment of the present invention.
下面將結合附圖對本發明實施方式作進一步的詳細說明。 The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
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10、一開關電路20、一主供電電路30。 Referring to FIG. 1 , an instant clock driving circuit 100 is provided for driving an instant clock generator 40 of a digital camera, and includes a main power source 110 , a flash circuit 10 , a switch circuit 20 , and a Main power supply circuit 30.
本實施方式中,所述主電源110為一電池。 In this embodiment, the main power source 110 is a battery.
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用於為數位相機之閃光燈50儲存電能。所述閃光燈充電電容C1另一端接地。所述變壓器11與所述閃光燈充電電容C1之間形成有第一結點O1。本實施方式中,所述至少一第一分壓電阻12包括第一電阻R1、一第二電阻R2、一第三電阻R3、一第四電阻R4。所述第一電阻R1、第二電阻R2、第三電阻R3及第四電阻R4依次串聯。且第一電阻R1串聯在所述第一結點O1上。所述第二電阻R2與第三電阻R3之間形成有第二結點O2。 The flash circuit 10 includes a transformer 11, at least a first voltage dividing 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 end of the transformer 11 is electrically connected to the flash charging capacitor C1. The transformer 11 is configured to output a voltage of 300V to the flash charging capacitor C1 to charge the flash charging capacitor C1. The flash charging capacitor C1 is used to store electrical energy for the flash 50 of the digital camera. The other end of the flash charging capacitor C1 is grounded. A first node O1 is formed between the transformer 11 and the flash charging capacitor C1. In this embodiment, the at least one first voltage dividing resistor 12 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are sequentially connected in series. And the first resistor R1 is connected in series on the first node O1. A second node O2 is formed between the second resistor R2 and the third resistor R3.
所述開關電路20包括一電晶體Q、一第三分壓電阻R22、一第二分壓電阻R21、一第一二極體D1及一延時電容C2。本實施方式中,所述電晶體Q為一P-MOS管。電晶體Q之源極S電性連接至所述第二結點O2,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形成有第三結點O3。所述第三分壓電阻R22之一端電性連接至所述第三結點O3,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O2,負極電性連接至第三結點O3。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O2,另一端電性連接第 三結點O3。 The switch circuit 20 includes a transistor Q, a third voltage dividing resistor R22, a second voltage dividing resistor R21, a first diode D1 and a delay capacitor C2. In this embodiment, the transistor Q is a P-MOS transistor. The source S of the transistor Q is electrically connected to the second node O2, and 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 transistor Q by the first diode D1. The gate G of the transistor Q and the first diode D1 form a third node O3. One end of the third voltage dividing resistor R22 is electrically connected to the third node O3, and the other end is grounded. The anode of the delay capacitor C2 is electrically connected to the second node O2, and the cathode is electrically connected to the third node O3. Similarly, one end of the second voltage dividing resistor R21 is electrically connected to the second node O2, and the other end is electrically connected. Three nodes O3.
所述主供電電路30包括一第二二極體D2及一濾波電容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結點O4。所述濾波電容C2之正極連接至所述所述第四結點O4,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內之主電源110為同一電源,也即為數位相機之電池。 The main power supply circuit 30 includes a second diode D2 and a filter 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 node O4 is formed between the second diode D2 and the power input end of the instant clock generator 40. The anode of the filter capacitor C2 is connected to the fourth node O4, and the cathode is grounded. It can be understood that the flash power circuit 10, the switch circuit 20 and the main power source 110 in the main power supply circuit 30 are the same power source, that is, the battery of the digital camera.
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O1之電壓經所述第一電阻R1、第二電阻R2、第三電阻R3及第四電阻R4分壓後得到一小於所述主電源110電壓之電壓,由於柵極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40之工作電壓由所述主供電電路30提供,具體地,主供電電路30內之主電源110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。 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 passes through the first diode D1 to supply a voltage to the gate G of the transistor Q, and the voltage of the first node O1 passes through The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are divided to obtain a voltage smaller than the voltage of the main power source 110. Since the gate G voltage is higher than the source S voltage, the transistor Q deadline. The operating voltage of the instant clock generator 40 is provided by the main power supply circuit 30. Specifically, the main power supply 110 in the main power supply circuit 30 supplies the operating voltage to the instant clock generator 40 via the second diode D2. .
當數位相機更換電池時,也即所述主電源110沒有電時,主電源110之電壓為0V,此時,閃光燈充電電容C1開始放電,經第一電阻R1、第二電阻R2、第三電阻R3及第四電阻R4分壓後,在所述第二結點O2得到一電壓V1。本實施方式中,所述電壓V1為3V左右。此時,電壓V1施加在至電晶體Q源極S,且該電壓V1經第二分壓電 阻R21分壓後施加至電晶體Q之柵極G,所述柵極G得到一0.3V左右之電壓,由於柵極G電壓低於源極S電壓,所述電晶體Q導通。此時,所述即時時鐘產生器40之工作電壓由所述閃光燈充電電容C1提供。 When the digital camera replaces the battery, that is, when the main power source 110 has no power, the voltage of the main power source 110 is 0V. At this time, the flash charging capacitor C1 starts to discharge, and passes through the first resistor R1, the second resistor R2, and the third resistor. After R3 and the fourth resistor R4 are divided, a voltage V1 is obtained at the second node O2. In the present embodiment, the voltage V1 is about 3V. At this time, the voltage V1 is applied to the source Q of the transistor Q, and the voltage V1 is subjected to the second partial voltage. The resistor R21 is applied to the gate G of the transistor Q after being divided, and the gate G obtains a voltage of about 0.3 V. Since the gate G voltage is lower than the source S voltage, the transistor Q is turned on. At this time, the operating voltage of the instant clock generator 40 is provided by the flash charging capacitor C1.
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。 When the main power source is disconnected, the flash charging capacitor is discharged, the transistor of the switching circuit is turned on, and the flash charging capacitor provides an operating voltage for the instant clock generator. 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.
綜上所述,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爰依本發明之精神所作之等效修飾或變化,皆應涵蓋於以下申請專利範圍內。 In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application 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 persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.
100‧‧‧即時時鐘驅動電路 100‧‧‧ Instant clock drive circuit
10‧‧‧閃光燈電路 10‧‧‧Flash circuit
20‧‧‧開關電路 20‧‧‧Switch circuit
30‧‧‧主供電電路 30‧‧‧Main power supply circuit
40‧‧‧即時時鐘產生器 40‧‧‧ Instant Clock Generator
11‧‧‧變壓器 11‧‧‧Transformers
50‧‧‧閃光燈 50‧‧‧flash
O1‧‧‧第一結點 O1‧‧‧ first node
O2‧‧‧第二結點 O2‧‧‧ second node
O3‧‧‧第三結點 O3‧‧‧ third node
O4‧‧‧第四結點 O4‧‧‧ fourth node
110‧‧‧主電源 110‧‧‧Main power supply
R1‧‧‧第一電阻 R1‧‧‧first resistance
R2‧‧‧第二電阻 R2‧‧‧second resistance
R3‧‧‧第三電阻 R3‧‧‧ third resistor
R4‧‧‧第四電阻 R4‧‧‧fourth resistor
C1‧‧‧閃光燈充電電容 C1‧‧‧Flash charging capacitor
Q‧‧‧電晶體 Q‧‧‧Optocrystal
G‧‧‧柵極 G‧‧‧Gate
S‧‧‧源極 S‧‧‧ source
D‧‧‧漏極 D‧‧‧Drain
C2‧‧‧延時電容 C2‧‧‧Time delay capacitor
R21‧‧‧第二分壓電阻 R21‧‧‧Second voltage divider resistor
R22‧‧‧第三分壓電阻 R22‧‧‧ third voltage divider resistor
D1‧‧‧第一二極體 D1‧‧‧First Diode
D2‧‧‧第二二極體 D2‧‧‧ second diode
C3‧‧‧濾波電容 C3‧‧‧Filter Capacitor
12‧‧‧第一分壓電阻 12‧‧‧First voltage divider resistor
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US9495928B2 (en) | 2014-04-24 | 2016-11-15 | Focaltech Systems, Ltd. | Driving circuit, driving method, display apparatus and electronic apparatus |
TWI633527B (en) * | 2014-04-24 | 2018-08-21 | 敦泰科技有限公司 | Driving circuit, driving method, display device and electronic device |
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TW201101935A (en) | 2011-01-01 |
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