TW200841771A - Light source driving device - Google Patents

Abstract

A light source driving device drives a plurality of light sources of a light source module, and includes an inverter circuit, a current sample circuit, and a PWM controller. The inverter circuit converts a received signal to an electronical signal driving the light sources. The current sample circuit is used for sampling current of the inverter circuit, and includes a detecting impedance element and an amplify circuit. The detecting impedance element is used for detecting current flowing through the inverter circuit. The amplify circuit is connected to the detecting impedance element, for amplifying the current. The PWM controller is connected to the current sample circuit, for receiving a signal output from the current sample circuit and generates a control signal to output to the inverter circuit to control output of the inverter circuit.

Description

200841771 九、發明說明： 【發明所屬之技術領域】200841771 IX. Description of the invention: [Technical field to which the invention belongs]

本發明涉及一種光源驅動裝置，尤其涉及一種應$ LCD)背光源模組之光源 顯示器（liquid crystal display， 驅動裝置。 【先前技術】 特別係冷陰極螢 LCD面板係以放電燈（Discharge Lamp)，The present invention relates to a light source driving device, and more particularly to a liquid crystal display (drive device) of a backlight module of the $LCD). [Prior Art] In particular, a cold cathode fluorescent LCD panel is a discharge lamp.

光燈（Cold Cathode Fluorescent Lamp，CCFL)作发北 動電壓才 則需要使 (Backlight)系統之光源。該種燈管需要較高的驅 可以點亮。隨著LCD面板尺寸向大型化方向的發展， 用複數燈管來提供足夠的亮度。 圖3所示為習知放電燈驅動裝置之功能模組圖，羽 、、_，省知放電 動開關電路30、一變壓電路31、一迴授電路33 ^及 變（Pulse Width Modulation，PWM)控制器 34 燈驅動裝置用於驅動一包括複數燈管之燈管組32,其包括 / 脈寬調 驅動開關電路 30將一接收到的直流電源訊號轉換為一交流却％ 又概Λ唬。變壓電路 31將該交流訊號轉換為可驅動燈管組32之弦冰4 & 收巩唬。迴授電 路33連接於變壓電路31之低壓端與PWM控制器34之門 ： 流經燈管組32之電流迴授至PWM控制器34。PWM控制器34根 據迴授電路33之輸出來控制驅動開關電路30之交流輸出訊 號，進而控制流經燈管組32之電流大小。 在上述習知放電燈驅動裝置中，變壓電路31之低壓端取 7 200841771 得的迴授訊號不僅含有燈管電流，亦含有燈管對地的雜散電容 而產生的洩漏電流，該等洩漏電流會影響迴授訊號選取的精確 h度。 【發明内容】 有鑑於此，需提供一種光源驅動裝置，具有較高的取樣電 流精確度。 一種光源驅動裝置，用於驅動一包括複數光源之光源模 組。該光源驅動裝置包括一逆變電路、一電流取樣電路以及一 PWM控制器。該逆變電路用於將一接收到的直流訊號轉換為— 可驅動該等光源之電訊說。該電流取樣電路用於對該逆變電路 進行電流取樣，其包括—探測阻抗元件以及一放大電路。其 之輸出。 中，該探測阻抗兀件用於探測流經該逆變電路之電流。該放大 電路與該探測阻抗TL件相連，用於放大該電流訊號。該p刪控 制器與該電流取樣電％目連，用於接收該電流取樣電路二 «，亚產生-控制tfl號輸出至該逆變電路，控制該逆變電路 該光源驅動裝置還包括一第一濾波電路，與該 連，用於濾除雜訊。該電流取樣電路可以連接於該第^相 路與該逆變電路之間。X，該第—濾波電路具有一輪^電 電流取樣電路亦可連接於該第一遽波電路之輸入端。该 直流 其 種光源驅動裝置與一直流電壓源相連接，用於將 5虎轉化為一'可驅動 ^ g芬粉、吟总 ' ^ J恥勛〜包括複數燈官之光源模組之電訊號， 8 200841771 中，該直流電壓源具有—古阳 巧壓端與一低壓端，用於提供該直流 訊號，該光源驅動裴置句杠 括〜逆變電路、一電流取樣電路及一 PWM控制器。其中，逆變兩狄、土 兒略連接於該直流電壓源之高壓端與 低壓端之間’用於將該直户+ ， ；IL祝唬轉換為一可驅動該光源模組之 電訊號。電流取樣電路遠技认 接於该逆變電路與該直流電壓源之低 壓端之間，用於對該逆變雷&山 路之輸出進行電流取樣並產生一輸 出訊號。PWM控制器連接該♦治 /弘机取樣電路與該逆變電路，用於The Cold Cathode Fluorescent Lamp (CCFL) is used to make the North Lights voltage and the light source of the Backlight system is required. This type of lamp requires a higher drive to illuminate. As the size of the LCD panel has increased in size, a plurality of lamps have been used to provide sufficient brightness. 3 is a functional module diagram of a conventional discharge lamp driving device, plume, _, a known discharge switch circuit 30, a transformer circuit 31, a feedback circuit 33 and a transformer (Pulse Width Modulation, PWM) The controller 34 lamp driving device is for driving a lamp group 32 including a plurality of lamps, and the pulse width adjusting driving circuit 30 converts a received DC power signal into an AC but %. The transformer circuit 31 converts the alternating current signal into a string ice 4 & The feedback circuit 33 is connected to the low voltage side of the transformer circuit 31 and the gate of the PWM controller 34: the current flowing through the lamp group 32 is fed back to the PWM controller 34. The PWM controller 34 controls the AC output signal of the drive switch circuit 30 based on the output of the feedback circuit 33 to control the amount of current flowing through the lamp group 32. In the above conventional discharge lamp driving device, the feedback signal obtained by the low voltage end of the transformer circuit 31 7 200841771 includes not only the lamp current but also the leakage current generated by the stray capacitance of the lamp to the ground, and the leakage. The current affects the exact h degree of the feedback signal selection. SUMMARY OF THE INVENTION In view of the above, it is desirable to provide a light source driving device having a high sampling current accuracy. A light source driving device for driving a light source module including a plurality of light sources. The light source driving device comprises an inverter circuit, a current sampling circuit and a PWM controller. The inverter circuit is configured to convert a received DC signal into a telecommunication that can drive the light sources. The current sampling circuit is configured to perform current sampling on the inverter circuit, and includes a detecting impedance element and an amplifying circuit. Its output. The detecting impedance component is for detecting a current flowing through the inverter circuit. The amplifying circuit is coupled to the sense impedance TL for amplifying the current signal. The p-deletion controller is connected to the current sampling circuit for receiving the current sampling circuit 2, and the sub-generation-control tfl number is output to the inverter circuit, and the light source driving device further includes a first A filter circuit, connected to the filter, is used to filter out noise. The current sampling circuit can be connected between the first phase circuit and the inverter circuit. X. The first filter circuit has a round current sampling circuit or an input terminal of the first chopper circuit. The DC light source driving device is connected with a DC voltage source, and is used to convert 5 tigers into a 'driveable ^ g fen powder, 吟 total ' ^ J shame ~ including the electrical signal of the light lamp module of the plurality of lights , in 200841771, the DC voltage source has a - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - . Wherein, the inverter two diodes and the earth are slightly connected between the high voltage end and the low voltage end of the DC voltage source for converting the direct current +, IL to a electric signal capable of driving the light source module. The current sampling circuit is remotely coupled between the inverter circuit and the low voltage terminal of the DC voltage source for current sampling of the output of the inverter lightning & mountain road and generating an output signal. The PWM controller is connected to the ♦ 治/Hong machine sampling circuit and the inverter circuit, and is used for

接收該電流取樣電路輪出的邙缺、，女 Ώ的Λ唬，亚產生一控制訊號輸出至該 逆變電路，以控制該逆變電路之輸出。 本發明之光源驅動裝置，透過電流取樣電路對該逆變電路 進行電流取樣，不受光源特性的影響，且提高取樣電流之精確 度。 【實施方式】 圖1所示係本發明光源驅動裝置一實施方式之功能模組 圖。該光源驅動裝置與一直流電壓源相連接，用於將一直流訊 號Viri轉化為一可驅動一包括複數燈管之光源模組1 2之電气 號，其中，該直流電壓源具有一高壓端與一低壓端，用於提供 該直流訊號Vm。光源驅動裝置包括一第一濾波電路、一逆 變電路11、一電流取樣電路13以及一脈衝寬度調變（pulse width modulation，PWM)控制器 14。 本實施方式中，直流電壓源可以為直流/直流轉換器，亦 可以為交流/直流轉換器。 9 200841771 弟一濾波電路10連接於直流電壓源之高壓端與低壓端之 :二連接於直流電壓源與逆變電路u之間，用於濾除雜訊。 上貫施方式中’第—4波電路1G為—電容树C12,用於漉除 逆又电路11與第一濾波電路10並行連接，用於將一接收 到的訊號轉化為-可驅動該等光源之電訊號，其包括一驅動開 關電路111與一變壓電路112。其中，驅動開關電路m用於 將該接收到的訊號轉化為—交流織。變壓電路ιΐ2與該驅動 開關電路111相連’用於將該交流訊號轉化為可驅動光源模組 U之電訊號。本實施方式中’該逆變電路u所接收到的訊號 係直流電壓源所提供的直流訊號Vln中濾除雜訊後的訊號，驅 動開關電路111輸出之交流訊號係—方波訊號，變壓電路112 輪出之訊號係一弦波訊號。 電流取樣電路13連接於第一濾波電路1〇與逆變電路u 1之間，用於對逆變電路n進行電流取樣。在本實施方式中， 電流取樣電路13包括一第二濾波電路131、一探測阻抗元件 Zu以及一放大電路132。其中，該第二濾波電路131包括一第 —電阻R11、一第二電阻R12以及一第一電容C11。放大電路 132包括一放大态A1、一第一阻抗元件I?、一第二阻抗元件 以及一第三電阻R13。 探測阻抗元件Zn串行連接於第一濾波電路1〇與逆變電路 11之驅動開關電路ill之間。在本實施方式中，探測阻抗元件 200841771Receiving the shortage of the current sampling circuit, the female Ώ generates a control signal output to the inverter circuit to control the output of the inverter circuit. The light source driving device of the present invention performs current sampling on the inverter circuit through a current sampling circuit, is not affected by the characteristics of the light source, and improves the accuracy of the sampling current. [Embodiment] FIG. 1 is a functional block diagram of an embodiment of a light source driving device of the present invention. The light source driving device is connected to the DC voltage source for converting the DC signal Viri into an electric number capable of driving a light source module 12 including a plurality of lamps, wherein the DC voltage source has a high voltage end and A low voltage end is used to provide the DC signal Vm. The light source driving device includes a first filter circuit, an inverse circuit 11, a current sampling circuit 13, and a pulse width modulation (PWM) controller 14. In this embodiment, the DC voltage source may be a DC/DC converter or an AC/DC converter. 9 200841771 The filter circuit 10 is connected to the high voltage end and the low voltage end of the DC voltage source. The second circuit is connected between the DC voltage source and the inverter circuit u for filtering noise. In the upper application mode, the 'fourth wave circuit 1G is a capacitor tree C12, and the circuit 11 for parallel removal is connected in parallel with the first filter circuit 10 for converting a received signal into a driveable The electrical signal of the light source includes a driving switch circuit 111 and a voltage converting circuit 112. The driving switch circuit m is configured to convert the received signal into a woven fabric. The transformer circuit ι is connected to the drive switch circuit 111 for converting the AC signal into a signal that can drive the light source module U. In the present embodiment, the signal received by the inverter circuit u receives the signal from the DC signal Vln provided by the DC voltage source, and the signal of the AC signal output by the switch circuit 111 is converted into a square wave signal. The signal that circuit 112 turns out is a string signal. The current sampling circuit 13 is connected between the first filter circuit 1A and the inverter circuit u1 for current sampling of the inverter circuit n. In the present embodiment, the current sampling circuit 13 includes a second filter circuit 131, a sense impedance element Zu, and an amplification circuit 132. The second filter circuit 131 includes a first resistor R11, a second resistor R12, and a first capacitor C11. The amplifying circuit 132 includes an amplified state A1, a first impedance element I?, a second impedance element, and a third resistor R13. The detecting impedance element Zn is connected in series between the first filter circuit 1A and the drive switch circuit ill of the inverter circuit 11. In the present embodiment, the impedance element is detected 200841771

Zu包括-輸入端Za以及一輸出端Zb，其輪人端Za連接於、, 變電路11，其輪出端η連接於直流電壓源之低壓端，用於t *測流經逆變電化之電流。本實施方式中，探靠抗元件采 棟測之電流為1流訊號，且該探測阻抗元件Zll為電随元: 本發明其他實施方式中，探測阻抗元件z"亦可 件與電容元件並聯構成。 阪疋 屯路132與探測阻抗元件Ζιι相連，即連接於卜 之中輪出端办’用於放大該探測F且抗元件Zli“3 、二’、玫大器A1具有一正極輪入端、一負極輪入 以及-輸出端。第—阻抗元件&之—端連接於放大器 極輸，端’其另1與探測阻抗元件Zn之輪出端Zb相連。！ 一讀Zl3連接於放大器Μ之負極輪入端與輸出端之間弟 本κ衫式中，第一阻抗元件Zi2以及第二阻抗元件^為電限 凡件。第三電阻Rl3之一端連接於放大器A1之輸出端，其另 -端作為電流取樣電路13之輸出端，即連接於放大器Μ ^輪 出端與PWM控制器之間，用於調整該放大器A1輸出之電訊號^ 第二濾波電路131連接於放大器A1之正極輸入端與探測 阻抗元件Zu之輸入端Za之間，用於濾除電流訊號中的高頻成 分。詳而言之，第一電阻R11之一端與探測阻抗元件乩之輪 入端Za相連’即連接於阻抗元件Zll之輸入端仏與逆變電路 11之間，其另一端連接於放大器A1之正極輪入端。第—電容 CU連接於第一電阻R11之另一端、放大器M之正極輪入端= 11 200841771 地之間。其中，§亥第—電阻R11與該第—電容⑴構成一低通 濾波器，用於濾除電流訊號中的高頻成分。第二電阻Ri2與第 -電容C11並行連接，用於調整放大器A1之正極輸入端^電 壓。 PWM控制②14與電流取樣電路13相連，用於接收該電流 取樣电路13輸出的訊號Vautl，並產生_控制訊號輸出至逆變 電路1卜㈣該逆變電路丨丨之輸出。本實施方式巾，p簡控 制為14係連接於電流取樣電路13與該驅動開關電路hi之 間，用於控制該驅動開關電路1U之輸出。又，pwM控制器包 括一 PWM積體電路（省略繪出）以及一迴授網路（省略繪出 其中，該迴授網路與該PWM冑體電路相連，用於對該簡積體 電路進行補償。 ^本發明之電流取樣電路13係連接於第—濾波電路1〇與逆 變電路11之間。因此’光源驅動裝置可以利用電流取樣電路 13之探測阻抗元件Zu探測流經逆變電路η之交流電流，芎交 流電流再經由第二濾波電路131以濾除其中的高頻::； 波後的訊號由放大電路132進行放大。之後，光源驅動裝置透 過PWM控制器14接收該放大後的電流訊號，並產生一控制訊 號輸出至逆變電路1 1，控制該逆變電路1 1 〜卿出，進而控制 輸出至光源模組12之電流。 圖2所示係本發明光源驅動裝置另一實施方式之功能模組 圖。該光源驅動裝置與本發明圖1所示之光源驅動裝置 12 200841771 同，區別在於：圖2所示之第一濾波電路20具有一輸入端， 電流取樣電路23係連接於該第一濾波電路20之輸入端，換言 之，第一濾波電路20係連接於直流電壓源之高壓端與探測阻 抗元件Z21之輸入端Za’之間，此時，該探測阻抗元件Z21所探 測之電流並未經過第一濾波電路20，故為一直流訊號。 在此一實施方式中，電流取樣電路23還包括一第四電阻 R24以及一開關元件Μ。開關元件Μ具有一輸入端，一第一輸 出端以及一第二輸出端，其中，該輸入端用於接收一 PWM訊號 Vp〇i，第一輸入端係透過第四電阻R24與第三電阻R23共同連 接至PWM控制器24，該第二輸出端接地，用於產生交流訊號。 第四電阻R24連接於該開關元件Μ之第一輸出端與該第三電阻 R23之另一端之間，用於調整該電流取樣電路13之響應速度。 詳而言之，當開關元件Μ導通時，第三電阻R23與第四電 阻R24構成分壓電路，使電流取樣電路23輸出的訊號V〇ut2電 壓往下降，當開關元件Μ截止時，電流取樣電路23輸出的訊 號V〇ut2電壓往上升，形成一交流訊號。因此，輸出的訊號V〇ut2 除了放大器A2輸出的直流訊號外，亦含有第四電阻R24與開 關元件Μ共同所產生的交流訊號。即，電流取樣電路23輸出 的訊號Vout2為一複合訊號，且，該複合訊號含有直流及交流成 分，用於調整電流取樣電路13之響應速度。 本實施方式中，開關元件Μ之輸入端接收之PWM訊號Vmi 可為光源驅動裝置之外部控制器（省略繪出）輸出的PWM訊號， 13 200841771 亦可為内部之PWM控制器24輸出的訊號。 同時’第二阻抗元件Z23為電阻元件與電容元件並聯構成。 •詳而言之，第二阻抗元件Zu包括一第五電阻R25，一第六電阻 R26以及一第二電容C22。其中，第五電阻R25接於放大器A2 之負極輸入端與輸出端之間。第六電阻R26與第二電容C22串 行連接後再與該第五電阻R25並行連接。本實施方式中，該第 二電容C22與第六電阻R26亦構成一補償電路，用於補償驅動 , 開關電路211在切換時所引起的突波電流使放大器A2之增益 所發生的變動。 本發明之電流取樣電路23係連接於第一濾波電路20之輸 入端。因此，光源驅動裝置利用探測阻抗元件Z21探測流經逆 變電路21之電流訊號為直流訊號。該直流訊號同樣經由弟二 濾波電路231以濾除其中的高頻成分，該濾波後的直流訊號再 經由放大電路232進行放大。之後，開關元件Μ將該放大後的 直流訊號轉化為複合訊號。光源驅動裝置透過PWM控制器24 接收該複合訊號，並產生一控制訊號輸出至逆變電路21，控制 該逆變電路21之輸出，進而控制輸出至光源模組22之電流。 本發明之光源驅動裝置，利用電流取樣電路之探測阻抗元 件探測流經逆變電路之電流，再經由放大電路對探測阻抗元件 所探測之電流進行放大。之後，該光源驅動裝置透過PWM控制 器接收該放大後的電流訊號，並產生一控制訊號輸出至逆變電 路，控制該逆變電路之輸出，進而控制輸出至光源的電流。因 14 200841771 此，本發明之光源驅動裝置透過電流取樣電路對該逆變電路進 行電流取樣，不受光源特性的影響，且提高取樣電流之精確度。 本發明雖以較佳實施例揭露如上，然其並非用以限定本發 明。惟，任何熟悉此項技藝者，在不脫離本發明之精神和範圍 内，當可做更動與潤飾，因此本發明之保護範圍當視後附之申 請專利範圍所界定者為準。 【圖式簡單說明】 圖1係本發明光源驅動裝置一實施方式之功能模組圖。 圖2係本發明光源驅動裝置另一實施方式之功能模組圖。 圖3係習知放電燈驅動裝置之功能模組圖。 【主要元件符號說明】Zu includes an input terminal Za and an output terminal Zb, the wheel terminal Za is connected to the variable circuit 11, and the wheel terminal η is connected to the low voltage end of the DC voltage source for t* current measurement through the inverter The current. In this embodiment, the current measured by the anti-component detection component is a 1-stream signal, and the detection impedance component Z11 is an electrical follow-up element. In other embodiments of the present invention, the detecting impedance component z" may also be connected in parallel with the capacitive component. . The Hankow Road 132 is connected to the detecting impedance element Ζιι, that is, connected to the wheel-in-the-end terminal for amplifying the detecting F and the anti-component Zli "3, 2", the rose A1 has a positive wheel input end, A negative wheel is in and the output terminal. The first-impedance element is connected to the amplifier pole, and the other end is connected to the wheel-extension terminal Zb of the detecting impedance element Zn. The first impedance element Zi2 and the second impedance element are electrically limited, and one end of the third resistor R13 is connected to the output end of the amplifier A1, and the other is - The terminal serves as an output end of the current sampling circuit 13, that is, connected between the output terminal of the amplifier 与^ and the PWM controller for adjusting the electrical signal outputted by the amplifier A1. The second filter circuit 131 is connected to the positive input terminal of the amplifier A1. Between the input terminal Za of the detecting impedance element Zu, for filtering the high frequency component in the current signal. In detail, one end of the first resistor R11 is connected to the wheel terminal Za of the detecting impedance element ' Input terminal 阻抗 and inverter of impedance element Z11 11 is connected to the positive terminal of the amplifier A1. The first capacitor CU is connected to the other end of the first resistor R11, and the positive terminal of the amplifier M = 11 200841771. The resistor R11 and the first capacitor (1) form a low-pass filter for filtering high-frequency components in the current signal. The second resistor Ri2 is connected in parallel with the first capacitor C11 for adjusting the positive input terminal of the amplifier A1. The PWM control 214 is connected to the current sampling circuit 13 for receiving the signal Vautl outputted by the current sampling circuit 13, and generating a _ control signal output to the inverter circuit 1 (4) the output of the inverter circuit 。. The wiper, p is controlled to be connected between the current sampling circuit 13 and the drive switch circuit hi for controlling the output of the drive switch circuit 1U. Further, the pwM controller includes a PWM integrated circuit (not shown). And a feedback network (omitted therein, the feedback network is connected to the PWM body circuit for compensating the simplified circuit. ^ The current sampling circuit 13 of the present invention is connected to the first filter Circuit 1〇 and the inverter circuit 11. Therefore, the 'light source driving device can detect the alternating current flowing through the inverter circuit η by using the detecting impedance element Zu of the current sampling circuit 13, and the alternating current is filtered by the second filtering circuit 131. The high frequency::; post-wave signal is amplified by the amplifying circuit 132. Thereafter, the light source driving device receives the amplified current signal through the PWM controller 14, and generates a control signal output to the inverter circuit 1 1. The inverter circuit 1 1 is controlled to control the current output to the light source module 12. Fig. 2 is a functional block diagram of another embodiment of the light source driving device of the present invention. The light source driving device is the same as the light source driving device 12 200841771 shown in FIG. 1 . The difference is that the first filter circuit 20 shown in FIG. 2 has an input terminal, and the current sampling circuit 23 is connected to the first filter circuit 20 . The input end, in other words, the first filter circuit 20 is connected between the high voltage end of the DC voltage source and the input end Za' of the detecting impedance element Z21. At this time, the current detected by the detecting impedance element Z21 does not pass through the first The filter circuit 20 is a continuous stream signal. In this embodiment, the current sampling circuit 23 further includes a fourth resistor R24 and a switching element Μ. The switching element Μ has an input end, a first output end and a second output end, wherein the input end is configured to receive a PWM signal Vp〇i, and the first input end is transmitted through the fourth resistor R24 and the third resistor R23 Connected in common to the PWM controller 24, the second output is grounded for generating an AC signal. The fourth resistor R24 is connected between the first output end of the switching element Μ and the other end of the third resistor R23 for adjusting the response speed of the current sampling circuit 13. In detail, when the switching element Μ is turned on, the third resistor R23 and the fourth resistor R24 form a voltage dividing circuit, so that the voltage of the signal V〇ut2 outputted by the current sampling circuit 23 decreases, and when the switching element is turned off, the current The voltage of the signal V〇ut2 outputted by the sampling circuit 23 rises to form an alternating current signal. Therefore, the output signal V〇ut2 includes the AC signal generated by the fourth resistor R24 and the switching element 除了 in addition to the DC signal output from the amplifier A2. That is, the signal Vout2 outputted by the current sampling circuit 23 is a composite signal, and the composite signal contains DC and AC components for adjusting the response speed of the current sampling circuit 13. In this embodiment, the PWM signal Vmi received by the input end of the switching element 可 can be a PWM signal outputted by an external controller (not shown) of the light source driving device, and 13 200841771 can also be a signal output by the internal PWM controller 24. At the same time, the second impedance element Z23 is formed by connecting the resistance element in parallel with the capacitance element. • In detail, the second impedance element Zu includes a fifth resistor R25, a sixth resistor R26 and a second capacitor C22. The fifth resistor R25 is connected between the negative input terminal and the output terminal of the amplifier A2. The sixth resistor R26 is connected in series with the second capacitor C22 and then connected in parallel with the fifth resistor R25. In the present embodiment, the second capacitor C22 and the sixth resistor R26 also constitute a compensation circuit for compensating for the fluctuation of the gain of the amplifier A2 caused by the surge current caused by the switching circuit 211 during switching. The current sampling circuit 23 of the present invention is connected to the input of the first filter circuit 20. Therefore, the light source driving device detects the current signal flowing through the inverse circuit 21 as a direct current signal by using the detecting impedance element Z21. The DC signal is also filtered by the second filter circuit 231 to filter out high frequency components therein, and the filtered DC signal is amplified by the amplifier circuit 232. Thereafter, the switching element 转化 converts the amplified DC signal into a composite signal. The light source driving device receives the composite signal through the PWM controller 24, and generates a control signal output to the inverter circuit 21, controls the output of the inverter circuit 21, and controls the current output to the light source module 22. The light source driving device of the present invention detects the current flowing through the inverter circuit by using the detecting impedance element of the current sampling circuit, and then amplifies the current detected by the detecting impedance element via the amplifying circuit. Thereafter, the light source driving device receives the amplified current signal through the PWM controller, and generates a control signal output to the inverter circuit to control the output of the inverter circuit, thereby controlling the current output to the light source. According to 14 200841771, the light source driving device of the present invention performs current sampling on the inverter circuit through a current sampling circuit, is not affected by the characteristics of the light source, and improves the accuracy of the sampling current. The present invention has been described above by way of a preferred embodiment, and is not intended to limit the invention. However, any person skilled in the art will be able to make changes and refinements without departing from the spirit and scope of the invention, and the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a functional block diagram of an embodiment of a light source driving device of the present invention. 2 is a functional block diagram of another embodiment of a light source driving device of the present invention. 3 is a functional block diagram of a conventional discharge lamp driving device. [Main component symbol description]

遽波電路 10 、 20 、 131 、 231 逆變電路 11 > 21 驅動開關電路 11卜 211 變壓電路 112 、 212 光源模組 12、22 電流取樣電路 13、23 放大電路 132 、 232 PWM控制器 14、24 阻抗元件 Zll、Zl2、Zl3、Z21、 放大器 A卜A2 電阻 RU、R12、R13、R 15 ；23 200841771 R24 、 R25 、 R26 電容 CH、C12、C21、C22、C23 開關元件 Μ 16Chopper circuit 10, 20, 131, 231 inverter circuit 11 > 21 drive switch circuit 11 211 transformer circuit 112, 212 light source module 12, 22 current sampling circuit 13, 23 amplifier circuit 132, 232 PWM controller 14 , 24 impedance components Zll, Zl2, Zl3, Z21, amplifier A, A2 resistors RU, R12, R13, R 15 ; 23 200841771 R24, R25, R26 capacitors CH, C12, C21, C22, C23 switching components Μ 16

Claims (1)

200841771 十、申請專利範圍： 包括複數光源之光源模組， • 1· 一種光源驅動裝置，用於驅動、 、該光源驅動裝置包括： 直流訊號轉換為一可％動該 逆變電路’用於將一接收到的 等光源之電訊號； 路進行電流取樣，其包括： 遠逆變電路之電流；及 一電流取樣電路，用於對該逆變電 一探測阻抗元件，驗探測流 一放大電路， 號，及 與該探測阻抗 件相連，用於放大該電流訊 一 PWM㈣器’與該電流取樣電路 樣電路輸—t㈣，並產生—連，用於接找電流取 控制該逆變電路之輪出。 & 1成唬輪出至該逆變電路， 2·如申請專利範圍第丨 第-濾波電路，与逆：源驅動裝置，其t還包括一 3·如申請專利範圍第2 ，用於濾除雜訊。 樣電路連接於該第裝置，其中該電流取 4·如申請專利範圍第2 、以哽麦電路之間。 波電路具有一輪、=之光源·驅動裝置，其中 路之輸入端。 麵流取樣電路連接於該第Γ ^濾波電 5·如申請專利範圍第2 波電路為一電容元件。斤述之光源動裝置’其中t亥第一濾 6.如申請專利範圍第 ^ 、所述之光源趣動裳置 、甲5亥效大電 17 200841771 路包括： 一放大器，具有一正極輸入端、一負極輸入端及一輸出端； 一第一阻抗元件，一端連接於該放大器之負極輸入端，其另 一端與該探測阻抗元件之一端相連；及 一第二阻抗元件，連接於該放大器之負極輸入端與輸出端之 間。 7. 如申請專利範圍第6項所述之光源驅動裝置，其中該電流取 樣電路還包括第二濾波電路，連接於該放大器之正極輸入端 與該探測阻抗元件之另一端之間，用於濾除電流訊號中的高 頻成分。 8. 如申請專利範圍第7項所述之光源驅動裝置，其中該第二濾 波電路包括： 一第一電阻，一端與該探測阻抗元件之另一端相連；以及 一第一電容，連接於該第一電阻之另一端與地之間。 9. 如申請專利範圍第8項所述之光源驅動裝置，其中該第二濾 波電路還包括一第二電阻，與該第一電容並行連接，用於調 整該放大器之正極輸入端之電壓。 10. 如申請專利範圍第6項所述之光源驅動裝置，其中該放大 電路還包括一第三電阻，一端連接於該放大器之輸出端，其 另一端作為該電流取樣電路之輸出端，用於調整該放大器輸 出之電訊號。 11. 如申請專利範圍第10項所述之光源驅動裝置，其中該電流 18 200841771 取樣電路還包括一開關 ,,„ 干具有—輸入端，—第一輪屮姓 以及一弟二輸出端，其中， 輪出埏 ‘該第-輸出… 錄入、用於接收-P倾訊號， 弟-輪“接地，用於產生交流訊號。 其中該PWM 其中該PWM 12^申請專·㈣11項所収光源驅動裝置 «係為該p w Μ控制器所輸出之訊號。 13.如申請專利範圍第11項所述之光源驅動裝置 ㈣係為—外部控制器所輪出之訊號。 A如申請專㈣圍gn項所述之光源 四電阻，連接於該開關元件之第一輪1 =括-弟 -端之間，用於調整……々一亥弟二電阻之另 私々丨〔取樣电路之響應速度。 阻請專·®第6韻叙光_料置， 阻抗7L件為電阻元件。 Μ弟一 16·如申請專利範圍第 阻抗元件為電阻元件。 原鶴裝置，其中該第二 17.如申請專利範圍第6項所狀 阻抗元件包括·· ㈣衣置’其中該第二 第五電阻，連接於該放大 之間； 第二電容；以及 一第六電阻，與該 連接。 器之負極輪入端與輸出端 第二電容串行連接後再與該第五電阻並行 1::申請專利範園第2項所述之光源驅動裝置，其中 几兀件為電阻元件或電阻元件與電容元件之並^ 19 200841771 •申明專利|。圍第1項所述之光源驅動裝置，其中該逆變 電路包括： —驅動開關電路，用於將該接收到的訊號轉換為_交流訊 號；以及 ’交堡電路，與該驅動開關電路相連，用於將該交流訊號轉 化為可驅動該光源模组之電訊號。 20. 如申請專利範圍第19項所述之光源驅動裝置，其中該围 控制器連接於該電流取樣電路與該驅㈣關電路之間，用於 控制該驅動開關電路之輸出。 21. 如申請專利範圍第丨項所述之光源驅動裝置，其中該剛 控制器包括： —PWM積體電路； 一迴授網路，與該PWM積體電路相連，用於對該pwM積體電 路進行補償。 22· —種光源驅動裝置，與一直流電壓源相連接，用於將一直 流訊號轉化為一可驅動一包括複數燈管之光源模組之電訊 號，其中，該直流電壓源具有一高壓端與一低壓端，用於提 供該直流訊號，該光源驅動裝置包括·· 一逆變電路，連接於該直流電壓源之高壓端與低壓端之間， 用於將該直流訊號轉換為一可驅動該光源模組之電訊號； 一電流取樣電路，連接於該逆變電路與該直流電壓源之低壓 端之間，用於對該逆變電路之輸出進行電流取樣並產生一輸 20 200841771 出訊號；及 一 PWM控制裔’連接該電流取樣電路與該逆變電路，用於接 ‘ 收該電流取樣電路輸出的訊號’並產生一控制訊號矜出至， 逆變電路，以控制該逆變電路之輪出。 23·如申請專利範圍第22項所述之光源驅動裝置，更包括—第 一濾波電路’連接於該直流電壓源之高壓端與低壓端之間。 24·如申請專利範圍第23項所述之光源驅動裝置，其中节+、)宁 厂 取樣電路包括一探測阻抗元件，其輸入端連接該逆變電路， 輸出端連接直流電壓源之低壓端。 25·如申請專利範圍第24項所述之光源驅動裝置，其中兮+、)宁 取樣電路還包括一放大電路，與該探測阻抗元件之輸出端相 連，用於放大該電流訊號。 26·如申請專利範圍第25項所述之光源驅動裝置，其中該放大 電路包括： 、 一放大為，包括一正極輸入端、一負極輸入端及—輸出端； 一第一阻抗元件，一端與該探測阻抗元件之輸出端相連，另 一端連接於該放大器之負極輸入端；及 一第二阻抗元件，連接於該放大器之負極輸入端與輸出端之 間。 27·如申請專利範圍第26項所述之光源驅動裝置，其中該電流 取樣電路還包括一第二濾波電路，連接於該放大器之正極輸 入端與該探測阻抗元件輸入端之間，用於濾除電流訊號中的 21 200841771 高頻成分。 、28.如申請專利範圍第27項所述之光源驅動裝置，其中該第二 ^ 濾波電路包括： 一第一電阻，一端與該探測阻抗元件之輸入端相連，另一端 與放大器之正极輸入端相連； 一第一電容，連接於該放大器之正极輸入端與地之間；以及 一第二電阻，連接於該放大器之正极輸入端與地之間。 p 29.如申請專利範圍第26項所述之光源驅動裝置，其中該放大 電路還包括一第三電阻，連接於該放大器之輸出端與該PWM 控制器之間，用於調整該放大器輸出之電訊號。 30. 如申請專利範圍第29項所述之光源驅動裝置，其中該電流 取樣電路還包括： 一第四電阻； 一開關元件，具有一輸入端，一第一輸出端以及一第二輸出 端，其中，該輸入端用於接收一 PWM訊號，該第一輸出端透 過該第四電阻與該第三電阻共同連接至該PWM控制器，該第 二輸出端接地，用於產生交流訊號。 31. 如申請專利範圍第30項所述之光源驅動裝置，其中該第二 阻抗元件包括： 一第五電阻，連接於該放大器之負極輸入端與輸出端之間； 一第二電容；以及 一第六電阻，與該第二電容串行連接後再與該第五電阻並行 22 200841771 連接。 32. 如申請專利範圍第25項所述之光源驅動裝置，其中該第一 濾波電路連接於該直流電壓源之高壓端與探測阻抗元件之 輸入端之間。 33. 如申請專利範圍第25項所述之光源驅動裝置，其中該第一 濾波電路連接於該直流電壓源之高壓端與探測阻抗元件之 輸出端之間。200841771 X. Patent application scope: A light source module including a plurality of light sources, • 1· A light source driving device for driving, the light source driving device includes: a DC signal is converted into a movable circuit, and the inverter circuit is used for a received electrical signal of the equal light source; the current sampling of the circuit, comprising: a current of the far inverter circuit; and a current sampling circuit for detecting the impedance component of the inverter, detecting the flow-amplifying circuit, And connected to the detecting impedance component for amplifying the current signal PWM (four) device 'and the current sampling circuit-like circuit output - t (four), and generating - connected for picking up current to control the rotation of the inverter circuit . & 1 into the inverter circuit, 2 · as claimed in the scope of the third - filter circuit, and reverse: source drive device, which also includes a 3 · as claimed in the scope of the second, for filtering In addition to noise. The sample circuit is connected to the first device, wherein the current is taken as 4, as in the patented range, between the buckwheat circuits. The wave circuit has a round, = light source and driving device, wherein the input end of the path. The surface current sampling circuit is connected to the second filter circuit. 5. The second wave circuit of the patent application is a capacitive element. The light source moving device of the jin is the first filter of the t-hai. 6. The application of the patent range is as follows, the light source is interesting, and the A5 mega-power is 17 200841771. The road includes: an amplifier with a positive input. a negative input terminal and an output terminal; a first impedance element having one end connected to the negative input terminal of the amplifier, the other end connected to one end of the detecting impedance element; and a second impedance element connected to the amplifier Between the negative input and the output. 7. The light source driving device of claim 6, wherein the current sampling circuit further comprises a second filter circuit connected between the positive input terminal of the amplifier and the other end of the detecting impedance element for filtering In addition to the high frequency components in the current signal. 8. The light source driving device of claim 7, wherein the second filter circuit comprises: a first resistor, one end connected to the other end of the detecting impedance element; and a first capacitor connected to the first The other end of a resistor is connected to the ground. 9. The light source driving device of claim 8, wherein the second filter circuit further comprises a second resistor coupled in parallel with the first capacitor for adjusting a voltage at a positive input terminal of the amplifier. 10. The light source driving device of claim 6, wherein the amplifying circuit further comprises a third resistor, one end is connected to the output end of the amplifier, and the other end is used as an output end of the current sampling circuit, Adjust the electrical signal output from the amplifier. 11. The light source driving device of claim 10, wherein the current circuit 18 200841771 sampling circuit further comprises a switch, „干有— input terminal, first 屮 initial name and one second output terminal, wherein , turn out 埏 'The first-output... Input, for receiving -P t-sign, brother-wheel "grounding, for generating AC signals. Wherein the PWM, the PWM 12^ application (4) 11 received light source driving device « is the signal output by the p w Μ controller. 13. The light source driving device (4) as described in claim 11 is a signal that is rotated by an external controller. A. For example, the four-resistor of the light source described in the special (4) surrounding gn is connected between the first wheel 1 of the switching element and the other side of the switching element for adjustment... [Response speed of the sampling circuit. Resist the special ·® 6th rhyme _ material, the impedance 7L is a resistance element. Μ弟一16·If the scope of application for patents, the impedance element is a resistance element. The original crane device, wherein the second 17. The impedance element according to item 6 of the patent application scope includes: (4) a garment in which the second fifth resistor is connected between the amplification; a second capacitor; Six resistors, connected to this. The negative terminal of the device is connected in series with the second capacitor of the output terminal, and then connected in parallel with the fifth resistor. 1: The light source driving device described in the second paragraph of Patent Application No. 2, wherein several of the components are resistance elements or resistance elements And the capacitive element ^ 19 200841771 • Declared patent | The light source driving device of claim 1, wherein the inverter circuit comprises: a driving switch circuit for converting the received signal into an _AC signal; and a 'Baobao circuit connected to the driving switch circuit, The signal for converting the alternating current signal into a light source module that can drive the light source module. 20. The light source driving device of claim 19, wherein the surrounding controller is coupled between the current sampling circuit and the drive (four) off circuit for controlling an output of the drive switch circuit. 21. The light source driving device of claim 2, wherein the rigid controller comprises: a PWM integrated circuit; a feedback network coupled to the PWM integrated circuit for integrating the pwM The circuit compensates. A light source driving device is connected to the DC voltage source for converting the DC signal into a power signal capable of driving a light source module including a plurality of lamps, wherein the DC voltage source has a high voltage end And a low voltage end for providing the DC signal, the light source driving device comprises: an inverter circuit connected between the high voltage end and the low voltage end of the DC voltage source, for converting the DC signal into a drivable The electric signal of the light source module; a current sampling circuit connected between the inverter circuit and the low voltage end of the DC voltage source for sampling the current of the output of the inverter circuit and generating a transmission 20 200841771 And a PWM control family' connects the current sampling circuit and the inverter circuit for receiving a signal outputted by the current sampling circuit and generating a control signal to the inverter circuit to control the inverter circuit It’s round. The light source driving device of claim 22, further comprising a first filter circuit ??? connected between the high voltage end and the low voltage end of the direct current voltage source. The light source driving device of claim 23, wherein the sampling circuit comprises a detecting impedance component, the input end of which is connected to the inverter circuit, and the output end is connected to the low voltage end of the DC voltage source. The light source driving device of claim 24, wherein the 兮+, 宁 ning sampling circuit further comprises an amplifying circuit connected to the output end of the detecting impedance element for amplifying the current signal. The light source driving device of claim 25, wherein the amplifying circuit comprises: an amplification comprising: a positive input terminal, a negative input terminal and an output terminal; a first impedance component, one end and The output of the detecting impedance element is connected, the other end is connected to the negative input of the amplifier; and a second impedance element is connected between the negative input end and the output end of the amplifier. The light source driving device of claim 26, wherein the current sampling circuit further comprises a second filter circuit connected between the positive input terminal of the amplifier and the input end of the detecting impedance component for filtering In addition to the current signal 21 in the 200841771 high frequency component. The light source driving device of claim 27, wherein the second filter circuit comprises: a first resistor, one end connected to the input end of the detecting impedance element, and the other end being connected to the positive input terminal of the amplifier Connected; a first capacitor connected between the positive input of the amplifier and ground; and a second resistor connected between the positive input of the amplifier and ground. The light source driving device of claim 26, wherein the amplifying circuit further comprises a third resistor connected between the output end of the amplifier and the PWM controller for adjusting the output of the amplifier Telecommunications signal. The light source driving device of claim 29, wherein the current sampling circuit further comprises: a fourth resistor; a switching element having an input end, a first output end, and a second output end, The input terminal is configured to receive a PWM signal, and the first output terminal is connected to the PWM controller through the fourth resistor and the third resistor, and the second output terminal is grounded to generate an AC signal. The light source driving device of claim 30, wherein the second impedance element comprises: a fifth resistor connected between the negative input terminal and the output terminal of the amplifier; a second capacitor; The sixth resistor is connected in series with the second capacitor and then connected to the fifth resistor in parallel 22 200841771. The light source driving device of claim 25, wherein the first filter circuit is connected between the high voltage end of the DC voltage source and the input end of the detecting impedance element. 33. The light source driving device of claim 25, wherein the first filter circuit is connected between a high voltage end of the DC voltage source and an output end of the sense impedance element. 23twenty three