Π24497 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種指示燈驅動電路，尤指一種用於顯示電腦電源 管理狀態之電源指示燈驅動電路。 y 【先前技術】 近年來，隨著PC(personalcomputer，個人電腦）之發展，用戶 對pc之實用性之要求不斷提高。傳統之Pc普遍採用led (light-emitting diode，發光二極體)發光與否來顯示電腦之電源管理Π24497 IX. Description of the Invention: [Technical Field] The present invention relates to an indicator driving circuit, and more particularly to a power indicator driving circuit for displaying a power management state of a computer. y [Prior Art] In recent years, with the development of PC (personal computer), the user's requirements for the practicality of pc have been increasing. The traditional Pc generally uses led (light-emitting diode) illumination to show the power management of the computer.
習知技術中’電腦上用於指示電源管理狀態之LED往往由於該 LED中之電流低於其額定電流’會存在發光不足、亮度不夠之問 題二或者由於該電流高於該額定電流，會出現亮度過高之問題。^ 指示電源管理狀態之LED亮度不足時，在光線較強之環境下，效& 並不十分明顯，用戶甚至需貼近LED才能觀察到LED是否在發"光； =备指示電源官理狀態之LED亮度過高時，由於該led長期工作在 高於其額定電流之環境下，該led容易提前失效。因此，習知技In the prior art, the 'LED on the computer for indicating the power management state often has a problem that the current in the LED is lower than its rated current' may have insufficient illumination, insufficient brightness, or because the current is higher than the rated current, The problem of excessive brightness. ^ When the brightness of the LED indicating the power management status is insufficient, the effect & is not very obvious in the environment with strong light. The user even needs to be close to the LED to observe whether the LED is emitting light. When the brightness of the LED is too high, the LED is easily prematurely disabled due to the long-term operation of the LED in an environment higher than its rated current. Therefore, conventional techniques
中電源指示燈驅動電路之功能及可靠度並不十分穩定。 H 因是，貫有必要對習知之電源指示燈驅動電路加以改進，以 消除上述缺失β 【發明内容】 穩定之電源指示 鑒於以上内容，有必要提供一種功能及可靠性 燈驅動電路。 夕旅I種電源指7^燈驅動電路，包括—用於指示電腦電源管理狀綠 發光二滅貞_—電狀間之第: 電電阻、-連接于該發光二極體正極與該電 機板健及—第二主機板賴控 支路m 機板信號及—第三主機板信號控制之第二 1曰ίίΐ ϊίϊ于該發光二極體之負極與地之間，並由—第 電甜體”第一電Β曰體串聯連接而成；該第二支路連接于該發光二 6 1324497 極體之正極與地之間，並由一 而成。 雷参術’該電源指示燈驅動電路採用電晶體，該第—供 々抵I . /第—供電負載電阻之阻值越大’該發光二極體中之i 選取之發光二極體之型號及規格，來選擇 電阻或該第二供電負載電阻之規格，使得通過該發ί 一極肢之電^達到其額定電流，從而正常發光。 【實施方式】The function and reliability of the medium power indicator drive circuit are not very stable. H Because it is necessary to improve the conventional power indicator driving circuit to eliminate the above-mentioned missing β [Summary] Stable power indication In view of the above, it is necessary to provide a function and reliability of the lamp driving circuit.夕旅I kind of power supply refers to the 7^ lamp driving circuit, including - for indicating the power management of the computer, green light, two annihilation _ - the first between the electrical: electrical resistance, - connected to the positive electrode of the LED and the motor board Jianhe—the second motherboard's control branch m signal board and the third motherboard signal control second 1曰ίίΐ ϊίϊ between the negative pole of the light-emitting diode and the ground, and by-the first sweetener The first electric body is connected in series; the second branch is connected between the positive pole of the light-emitting diode 6 1324497 and the ground, and is formed by one. The transistor, the first supply voltage to the I. / the first power supply load resistance has a higher resistance value, and the type and specification of the light-emitting diode selected in the light-emitting diode to select the resistance or the second power supply The specification of the load resistor is such that the rated current is reached by the electric current of the one-pole limb, thereby normally emitting light.
第-圖，本發明賴指示燈驅動電路之較佳實施方式包 括-心光-極體m、用於控制該發光二極體m電流之_第恭 負載電阻R1及-第二供電負載電阻幻、—第—電晶、一第、!* ，晶體Q2、-第三電晶體q3及—第四電晶體以。該第―供電 電阻R1及第二供電負載電阻R2之阻值相同。 、戰In the first embodiment, a preferred embodiment of the LED driving circuit of the present invention includes a heart-light body m, a gradual load resistor R1 for controlling the current of the light-emitting diode, and a second power supply load resistor. , - the first - electro-crystal, a first, ! *, the crystal Q2, - the third transistor q3 and - the fourth transistor. The resistance values of the first power supply resistor R1 and the second power supply load resistor R2 are the same. ,war
第二電晶體與一第四電晶體串聯連接 該發光二極體U1係雙極性發光二極體，其負極經由該第一供 負載電阻R1接入一3.3V電源VCC ’ 一電容C1接於其負極與地之 間。該發光二極體U1之負極與該第一供電負載電阻幻之間有一 點Μ。該第-電晶體Qk·接收由—第一蟑i傳輸之第一主機板 信號，即S3LED信號，該S3LED信號係在ACPI (Advanced Configuration and Power Interface，高級配置電源介面）規範下，電 腦處於S3狀態（Suspend to RAM，掛起到記憶體，即把所有資料保 存到記憶體，主系統停止運行，只有待機監控電路還在工作）時， 主機板發出的用於控制該發光二極體U1發光之信號。該第一電晶體 Q1之基極還經由一電阻R3接至3.3V電源VCC，集極接至該節點 Μ，射極接至該第二電晶體Q2之集極。該第二電晶體之射極接 地，基極經由一限流電阻R4接收由一第二埠2傳輸之第二主機板信 號，即S4LK)信號，該信號S4LED係ACPI規範下，電腦處於弘狀 態（Suspend to Disk，掛起到硬碟，即系統主電源關閉，但是硬碟 仍然帶電，把所有資料保存到硬碟，並可以被喚醒）時，主機妬於 出的用於控制該發光二極體U1發光之信號。' 7 1324497The second transistor is connected in series with a fourth transistor to the LED diode U1 bipolar LED, and the cathode is connected to a 3.3V power supply VCC via the first load resistor R1. A capacitor C1 is connected thereto. Between the negative pole and the ground. There is a point between the cathode of the LED U1 and the resistance of the first power supply load. The first transistor Qk receives the first motherboard signal transmitted by the first UI, that is, the S3 LED signal, and the S3 LED signal is under the ACPI (Advanced Configuration and Power Interface) specification, and the computer is in the S3 State (Suspend to RAM, suspends to memory, that is, saves all data to the memory, the main system stops running, only the standby monitoring circuit is still working), the main board sends out to control the LED U1 illumination Signal. The base of the first transistor Q1 is also connected to the 3.3V power supply VCC via a resistor R3, the collector is connected to the node Μ, and the emitter is connected to the collector of the second transistor Q2. The emitter of the second transistor is grounded, and the base receives a second motherboard signal transmitted by a second 埠2 via a current limiting resistor R4, that is, a S4LK) signal. The signal S4LED is under the ACPI specification, and the computer is in a state of Hong. (Suspend to Disk, suspends to the hard disk, that is, the system main power is off, but the hard disk is still powered, all the data is saved to the hard disk, and can be woken up), the host is out of control for controlling the light-emitting diode The signal that the body U1 emits light. ' 7 1324497
该發光二極體U1之正極經由該第二供電負載電阻p2接入3.3V 電源VCC，一電容C2接於其正極與地之間。該發光二極體ui之正 極與該第一供電負載電阻R2之間有一節點n。該第三電晶體Q3之基 極接收由一第三埠3傳輸之第三主機板信號，即S1LED，該信號 S1LED係在ACPI規範下，電腦處於si狀態（即除了透過Cpu時鐘 控制器將CPU關閉之外，其他之電腦部件仍然正常工作）時，主機 板發出之用於控制該發光二極體Ui發光之信號。該第三電晶體(?3 之基極還經由一電阻R5接至3.3V電源Vcc，集極接至該節，射 極接至該第四電晶體(54之集極。該細電晶體Q4之射極接地，基 極經由該限流電阻R4接收由該第二埠2傳輪之第二主機板信號。 s亥1阻R3及電阻R5阻值相等。該第一電晶體〇卜第二電晶體 Q2、第二龟日曰體Q3及苐四電晶體Q4均爲npn型電晶體。該第一電 晶體Q1及第二電MQ2組成-第―支路，該第三電晶體Q3及第四 電晶體Q4組成一第二支路。The anode of the LED U1 is connected to the 3.3V power supply VCC via the second power supply load resistor p2, and a capacitor C2 is connected between the anode and the ground. There is a node n between the positive electrode of the light-emitting diode ui and the first power supply load resistor R2. The base of the third transistor Q3 receives the third motherboard signal transmitted by a third port 3, that is, the S1 LED, the signal S1LED is under the ACPI specification, and the computer is in the si state (ie, the CPU is in addition to the Cpu clock controller). When the other computer components are still working normally, the signal from the motherboard is used to control the illumination of the LED Ui. The base of the third transistor (?3 is also connected to a 3.3V power supply Vcc via a resistor R5, the collector is connected to the node, and the emitter is connected to the collector of the fourth transistor (54. The fine transistor Q4) The emitter is grounded, and the base receives the second motherboard signal from the second 传2 transmission via the current limiting resistor R4. The resistance of the s1 resistor R3 and the resistor R5 are equal. The first transistor 〇 The transistor Q2, the second tortoise body Q3, and the fourth transistor Q4 are all npn-type transistors. The first transistor Q1 and the second electrode MQ2 constitute a -th branch, the third transistor Q3 and The four transistors Q4 form a second branch.
=作時1當電腦處於S3狀態時，該第―電晶抑〗及第二電晶 體Q2導通，該第三電晶體q3截止，即該第—支路導通，該第二支 路截止。此時’該發光二極細之正極電壓高 由該發光二極體ΙΠ之正極流向負極，該發光二極二& 腦處於S1狀態時，該第-電晶體φ截止， g 導通’即該第二支路導通，該第—支喊 電’該電流由該發光二極體 腦時，該第二電晶_及細電晶师 碎一支路均截止，該發光二極體Ul媳滅。由此，用戶可以 極體U1發光顏色及開關狀態來判斷該電腦之電源管 請參閱第二圖，由圖可知，該電源 ====發=3= 因此’設計人員可以根據具體電路光二極體中規 8 13.24497 格亥第—供電負載電阻R1選擇合適之規格，使得通過該發光 ί體ΐ路其歡電流，細正f縣。_地，也可根據 阻娜1之麵及規㈣輔—供電負載電 巾該第_電晶卿、第二電晶則2、第三電晶體 Q3及，四电日日體Q4還可以係PNP型電晶體。 綜上所述’本發明符合發明專利要件 立 i人Ϊ上之較佳實施方式，舉凡熟悉本案技月藝 以下之申請ί利神所作之等效修飾或變化，皆應涵蓋於 【圖式簡單說明】 第一圖=Γ電源指示燈驅動電路之較佳實施方式之電路 第二圖係本發明電源指示_ 二極體中所iii岛夕$ — t I罕乂仏貫％方式之發光 例關流與第-供電«電阻阻值之比 【主要元件符號說明】 第一供電負載電阻R1 第一電晶體 Q1 第三電晶體 Q3 電阻 R3,R5 電容 C1，C2 發光二極體 U1 弟一供電負載電阻R2 Q2 Q4 R4 第二電晶體 第四電晶體 限流電阻 9When the computer is in the S3 state, the first electro-optic crystal and the second electro-optic crystal Q2 are turned on, and the third transistor q3 is turned off, that is, the first branch is turned on, and the second branch is turned off. At this time, the positive electrode voltage of the light-emitting diode is high, and the positive electrode of the light-emitting diode is turned to the negative electrode. When the brain of the light-emitting diode 2 is in the S1 state, the first transistor φ is turned off, and g is turned on. When the second branch is turned on, the first branch shouts that the current is from the brain of the light emitting diode, and the second transistor and the fine crystallizer are all cut off, and the light emitting diode U1 is extinguished. Therefore, the user can determine the power tube of the computer by the U1 light-emitting color and the switch state. Please refer to the second figure. It can be seen from the figure that the power supply ==== hair = 3= Therefore, the designer can according to the specific circuit light pole Body gauge 8 13.24497 Gehaidi - The power supply load resistor R1 selects the appropriate specification, so that the current is passed through the illuminating body, and the f county is fine. _ ground, can also be based on the surface of the block 1 and the regulations (4) auxiliary - power supply load towel, the first _ electric crystal, the second crystal, the second transistor Q3 and the fourth electric day Q4 can also be PNP Type transistor. In summary, the present invention conforms to the preferred embodiment of the invention patent claim, and the equivalent modification or change made by the following patents should be covered in the simple drawing. Description: First Figure = circuit of the preferred embodiment of the power indicator drive circuit. The second diagram is the power indicator of the present invention. Flow and the first power supply «resistance resistance ratio [main component symbol description] First power supply load resistor R1 first transistor Q1 third transistor Q3 resistor R3, R5 capacitor C1, C2 light-emitting diode U1 brother one power supply load Resistor R2 Q2 Q4 R4 Second transistor fourth transistor current limiting resistor 9