201117671 六、發明說明： 【發明所屬之技術領域】 本發明係相關於一種冷陰極螢光燈管之驅動器，尤指一種根據冷 陰極螢光燈管之調光控制之波形產生器所產生之控制訊號進行調光 之冷陰極螢光燈管之驅動器。 【先前技術】 請參考第1圖’第1圖為先前技術之冷陰極螢光燈管(Cold201117671 VI. Description of the Invention: [Technical Field] The present invention relates to a driver for a cold cathode fluorescent lamp, and more particularly to a control generated by a waveform generator for dimming control of a cold cathode fluorescent lamp. The driver for the cold cathode fluorescent lamp that dims the signal. [Prior Art] Please refer to Figure 1'. Figure 1 shows the cold cathode fluorescent lamp of the prior art (Cold
Cathode Florescent Lamp, CCFL)之驅動電路1〇〇之示意圖。冷陰極 螢光燈管之驅動器100包含積體電路(IC)驅動器1〇1、第一開關 m、第二開關112、第三開關113、電阻12卜電容122、電阻123、 二極體124、電容125、直流隔離電容13卜電感132以及燈管模組Cathode Florescent Lamp, CCFL) schematic diagram of the drive circuit. The driver 100 of the cold cathode fluorescent lamp includes an integrated circuit (IC) driver 1〇1, a first switch m, a second switch 112, a third switch 113, a resistor 12 capacitor 122, a resistor 123, a diode 124, Capacitor 125, DC isolation capacitor 13 and inductor 132 and lamp module
14卜第一開關ill以及第二開關112分別由IC驅動器1〇1 iHG 端以及LG端所控制，第一開關ln與第二開關112互補地導通與 關閉’並且在所需的操作解下各具有約观的讀週期(崎 cycle)。1C驅動器1〇1之vcc端用來接收一電源電壓vcc。驅 動器101之BOOT端用來輸入電壓源，二極體m與電容⑵形成 机帶式(b她卿)電路以提供參考電壓，1C驅動器101之VS端用來 輸入參考電壓。 201117671 電性連接於RT端之電阻121以及電性連接kct端之電容122 ·#同於一 RC電路。1C驅動器101可根據電阻121以及電容122所 產生之時間參數來控制第一開關H1以及第二開關112之運作，以 產生驅動訊號來驅動燈管模組141。舉例來說，當電容122充電使 ct端之電壓值大於電源電壓VCC之電壓值之三分之二時，忙驅動 器101開啟第一開關ill並關閉第二開關112 ;當電容122放電使 CT端之電壓值小於電源電壓vcc之電壓值之三分之一時，IC；驅動 φ 器101關閉第一開關111並開啟第二開關112。因此，驅動訊號之 周期時間可藉由電阻121以及電容122來作調整。另外，IC驅動器 1〇1可根據CT端之電壓值將燈管模組141關閉(shutd〇wn)，當CT 端之電壓值小於電源電壓vcc之電壓值之六分之一時，IC驅動器 101關閉第一開關111及第二開關112,以關閉燈管模組141。例如， 第二開關113電性連接於CT端以及地端之間，當第三開關113被 切換訊號SD開啟時，CT端之電壓值將被拉至地端電壓使IC驅動 器101關閉燈管模組141。因此，藉由IC驅動器1〇1之CT端可以 對燈管模組141進行調光控制。 【發明内容】 本發明係提供一種可調光控制之冷陰極螢光燈管之驅動器。該驅 °匕3二輸出端以及一振盪時間輸入端。該二輸出端用來驅動一 . A g異、、且。該振盪時間輸入端用來接收一控制訊號，以對該燈管模 、且進仃調光控制。該控制訊號在一週期時間之一第一時段為具有一 201117671 第-電壓準位與—第二電群位之一方波， 間之一第二時段為一第 電壓準位 該控制訊號在該週期時 本毛月另提供了-種冷陰極螢光燈管之調光控制之波形 器。該冷陰極營光燈管之調光控制之波形產生器包含一方波產生單 兀、-直流電壓產生單元以及一輸出單元。該方波產生單元用來產 生^有帛f壓準位與一第二電鮮位之一方波。該直流電壓產 生早疋，用來產生具有—第三電壓準位之—直流電壓。該輸出單元 用來根據-場職在-職時時段輸出該方波以及該 週期時間之-第二時段輸出該直流電壓。 本發明另提供-種冷陰極螢光燈管之調光㈣之方法。該方法包 含根據-切換職產生-㈣喊，該控舰號在—週期時間《一 第-時段為具有-第-電壓準位與H壓準位之—方波，該控 制訊號在該週㈣間之H段為—第三賴準位；以及根據該 控制訊號對一燈管模組進行調光控制。 【實施方式】 請參考第2圖，第2圖為本發明之冷陰極螢光燈管(c〇ld14b first switch ill and second switch 112 are respectively controlled by the IC driver 1〇1 iHG terminal and the LG terminal, the first switch ln and the second switch 112 are complementarily turned on and off' and are respectively solved under the required operation Has an approximate reading cycle (sakisaki). The vcc terminal of the 1C driver 1〇1 is used to receive a power supply voltage vcc. The BOOT terminal of the driver 101 is used to input a voltage source, the diode m and the capacitor (2) form a band-type circuit to provide a reference voltage, and the VS terminal of the 1C driver 101 is used to input a reference voltage. 201117671 The resistor 121 electrically connected to the RT terminal and the capacitor 122·# electrically connected to the kct terminal are the same as an RC circuit. The 1C driver 101 can control the operation of the first switch H1 and the second switch 112 according to the time parameters generated by the resistor 121 and the capacitor 122 to generate a driving signal to drive the lamp module 141. For example, when the capacitor 122 is charged such that the voltage value of the ct terminal is greater than two-thirds of the voltage value of the power supply voltage VCC, the busy driver 101 turns on the first switch ill and turns off the second switch 112; when the capacitor 122 discharges the CT terminal When the voltage value is less than one third of the voltage value of the power supply voltage vcc, the IC; the driving φ device 101 turns off the first switch 111 and turns on the second switch 112. Therefore, the cycle time of the drive signal can be adjusted by the resistor 121 and the capacitor 122. In addition, the IC driver 101 can turn off the lamp module 141 according to the voltage value of the CT terminal. When the voltage value of the CT terminal is less than one sixth of the voltage value of the power supply voltage vcc, the IC driver 101 The first switch 111 and the second switch 112 are turned off to turn off the lamp module 141. For example, the second switch 113 is electrically connected between the CT terminal and the ground terminal. When the third switch 113 is turned on by the switching signal SD, the voltage value of the CT terminal is pulled to the ground terminal voltage to cause the IC driver 101 to turn off the lamp mode. Group 141. Therefore, the lamp module 141 can be dimmed by the CT terminal of the IC driver 101. SUMMARY OF THE INVENTION The present invention provides a driver for a dimmable control cold cathode fluorescent lamp. The drive has a two-output terminal and an oscillation time input terminal. The two outputs are used to drive an A. The oscillation time input terminal is configured to receive a control signal to control the lamp mode and perform dimming control. The control signal has a first voltage period of 201117671 and a square wave of the second electric group in a first period of time, and the second period is a voltage level. The control signal is in the period. At the same time, this month provides a waveform control device for dimming control of a cold cathode fluorescent lamp. The waveform controller for dimming control of the cold cathode camp light tube comprises a square wave generating single 兀, a DC voltage generating unit and an output unit. The square wave generating unit is configured to generate a square wave having a pressure level and a second electric field. The DC voltage is generated early to generate a DC voltage having a - third voltage level. The output unit is configured to output the DC voltage according to the -the field duty-time period output period and the second period of the cycle time. The invention further provides a method of dimming (4) of a cold cathode fluorescent lamp. The method includes: according to the - switching job generation - (four) shouting, the control ship number in the - cycle time "a - time period is - square - voltage level and H pressure level - square wave, the control signal in the week (four) The H segment is - the third reliance level; and the dimming control is performed on a lamp module according to the control signal. [Embodiment] Please refer to FIG. 2, and FIG. 2 is a cold cathode fluorescent lamp of the present invention (c〇ld)
Cathode Florescent Lamp，CCFL)之驅動器200之示意圖。冷陰極螢 光燈管之驅動器200包含積體電路(1C)驅動器201以及波型產生器 250’其中1C驅動器201之架構及運作原理相似於先前技術之IC驅 201117671 動器101。波型產生器250電性連接於Ic驅動器2〇1之CT端，用 來產生控制訊號S。1C驅動器201可根據CT端之電壓值產生燈管 模組141之驅動訊號或將燈管模組141關閉(shutd〇wn)。舉例來 當CT端之電屢值大於第一臨界值時，Ic驅動器2〇1開啟第一開關 ill並關閉第二開關m; t CT端之電壓值小於第二臨界值時，IC 驅動器201關閉第一開關in並開啟第二開關112;當CT端之電壓 值小於第三臨界值時’1C驅動器201關閉第一開關lu及第二開關 112 ;在本實施例中，第一臨界值為電源電壓vcc之電壓值之三分 之一，第二臨界值為電源電壓vcc之電壓值之三分之一，第三臨界 值為電源賴vcc之電壓值之六分之—。因此，波型產生器25〇 1 根據CT端之電壓值產生具有第—電壓準位、第二電壓準位及第三 電壓準位之控制訊號DIM輸入到CT端，以取代先前技術中由電 阻、電容及開關電性連接於rT端及^丁端之電路，其中第一電壓準 位大於第一臨界值，第二電壓準位小於第二臨界值，第三電壓準位 小於第三臨界值。如此，IC驅動器2〇1可根據CT端所接收到之控 制訊號DIM對燈管模組141進行調光控制。 凊同時參考第2圖及第3圖，第3圖為本發明之控制訊號DIM 之波形圖。波型產生器25〇根據切換訊號SD產生控制訊號DIM， 以對燈官模組141進行亮度控制。波型產生器25〇包含方波產生單 凡251、直流電壓產生單元252以及輸出單元253。方波產生單元 251用來產生具有第一電壓準位V1與第二電壓準位¥2之方波 直流電壓產生單元252用來產生具有第三電壓準位V3之直流電壓 201117671 D。第一電壓準位VI、第二電壓準位V2以及第三電壓準位V3之 電壓值可根據使用者之需求而作適當的變化。於本實施例中，由於 當CT端之電壓值大於電源電壓VCC之電壓值之三分之二時，ic 驅動器201開啟第一開關111並關閉第二開關112;當CT端之電壓 值小於電源電壓VCC之電壓值之三分之一，1C驅動器201關閉第 一開關111並開啟第二開關112 ;當CT端之電壓值小於電源電壓 VCC之電壓值之六分之一時，1C驅動器201關閉第一開關Hi及第 二開關112，因此’第一電壓準位vi大於電源電壓VCc之電壓值 之二分之一，苐一電壓準位V2小於電源電壓VCC之電壓值之三分 之一，第三電壓準位V3小於電源電壓VCC之電壓值之六分之一。 輪出單元253根據切換訊號SD輸出方波W以及直流電壓D以產生 控制訊號DIM。更明確的說，輸出單元253在一週期時間τ之第一 時段tl輸出方波W以及第二時段t2輸^直流電壓D。 當控制訊號DIM為具有第一電壓準位V1及第二電壓準位％ 方波w時，ic驅動器201驅動燈管模組i4i，第一開關⑴與第Schematic of the driver 200 of the Cathode Florescent Lamp, CCFL). The cold cathode fluorescent lamp driver 200 includes an integrated circuit (1C) driver 201 and a mode generator 250'. The architecture and operation principle of the 1C driver 201 is similar to that of the prior art IC driver 201117671. The waveform generator 250 is electrically connected to the CT terminal of the Ic driver 2〇1 for generating the control signal S. The 1C driver 201 can generate the driving signal of the lamp module 141 or turn off the lamp module 141 according to the voltage value of the CT terminal. For example, when the electrical value of the CT terminal is greater than the first threshold, the Ic driver 2〇1 turns on the first switch ill and turns off the second switch m; when the voltage value of the CT terminal is less than the second threshold, the IC driver 201 is turned off. The first switch in and the second switch 112 are turned on; when the voltage value of the CT terminal is less than the third threshold value, the 1C driver 201 turns off the first switch lu and the second switch 112; in this embodiment, the first threshold value is the power source. One third of the voltage value of the voltage vcc, the second threshold is one-third of the voltage value of the power supply voltage vcc, and the third critical value is six-fold of the voltage value of the power supply vcc. Therefore, the waveform generator 25〇1 generates a control signal DIM having a first voltage level, a second voltage level, and a third voltage level to the CT terminal according to the voltage value of the CT terminal, instead of the resistor in the prior art. The capacitor and the switch are electrically connected to the circuit of the rT terminal and the terminal, wherein the first voltage level is greater than the first threshold, the second voltage level is less than the second threshold, and the third voltage level is less than the third threshold . In this way, the IC driver 2〇1 can perform dimming control on the lamp module 141 according to the control signal DIM received by the CT terminal.凊 Referring to FIG. 2 and FIG. 3 simultaneously, FIG. 3 is a waveform diagram of the control signal DIM of the present invention. The waveform generator 25 generates a control signal DIM according to the switching signal SD to perform brightness control on the lamp module 141. The mode generator 25A includes a square wave generating unit 251, a DC voltage generating unit 252, and an output unit 253. The square wave generating unit 251 is configured to generate a square wave DC voltage generating unit 252 having a first voltage level V1 and a second voltage level ¥2 for generating a DC voltage 201117671 D having a third voltage level V3. The voltage values of the first voltage level VI, the second voltage level V2, and the third voltage level V3 can be appropriately changed according to the needs of the user. In this embodiment, when the voltage value of the CT terminal is greater than two-thirds of the voltage value of the power supply voltage VCC, the ic driver 201 turns on the first switch 111 and turns off the second switch 112; when the voltage value of the CT terminal is less than the power source One-third of the voltage value of the voltage VCC, the 1C driver 201 turns off the first switch 111 and turns on the second switch 112; when the voltage value of the CT terminal is less than one-sixth of the voltage value of the power supply voltage VCC, the 1C driver 201 is turned off. The first switch Hi and the second switch 112, so that the 'first voltage level vi is greater than one-half of the voltage value of the power supply voltage VCc, and the first voltage level V2 is less than one third of the voltage value of the power supply voltage VCC, The third voltage level V3 is less than one sixth of the voltage value of the power supply voltage VCC. The wheel-out unit 253 outputs a square wave W and a DC voltage D based on the switching signal SD to generate a control signal DIM. More specifically, the output unit 253 outputs the square wave W and the second period t2 to the DC voltage D during the first period t1 of the cycle time τ. When the control signal DIM has the first voltage level V1 and the second voltage level % square wave w, the ic driver 201 drives the lamp module i4i, the first switch (1) and the first
織著方波W的解互補地開啟與關。當控制訊號 D =2:位％之直流電壓D時，IC驅動器加將燈管 、、且141關閉。如第3圖所示，批也卜 φγ- 4δί1旎DIM在週期時間τ之第一 W為具有第-電壓準位V1與第 制訊號疆在週期時間τ之第 =一 ^方波W，而. 壓D;亦即IC驅動哭加―、it2為第二準位之直流' 模組⑷，而在週_ T 内燈管網 第一時奴t2内將燈管模組141關閉 201117671 在本實施例中，控制訊號dim之週期時間T為5ms (亦即控制訊號 DIM之頻率為2〇〇Hz)，而方波w之頻率為5〇kHz。另外，在控制 訊號DIM之週期時間τ内，控制訊號DIM之方波w所持續的時間 (第一時段tl)與直流電壓D所持續的時間(第二時段決定了燈管 模組141所產生的亮度，而第一時段tl以及第二時段t2之長度由切 換訊號SD所決定。因此，藉由波型產生器25〇產生之控制訊號聰 可達成燈管模組141調光之目的。 清參考第4圖，第4圖為三種不同亮度之控制訊號之示意圖。 CCFL驅動器200可分別根據控制訊號DIMa、DIMb、D]Mc來驅動 燈管模組141 ’而使燈管模組141產生三種不同的亮度。在控制訊 號〇_、〇祕、〇臉+’第一時段11為方波^斤持續的時間， 第一時段t2為直流電壓D所持續的時間。當控制訊號DIMa之第一 時'^又tl與第一時段t2之比例為1:3，燈管模組mi可產生第一亮度 值之燈光。由於燈官模、组141在第一時段tl為開啟，而在第二時段 t2為關閉，亦即燈管模組141關閉的時間為開啟時的三倍，所以第 -亮度值之燈光約為燈管模組141全亮時之25%。當控制訊號〇祕 之第時段tl與第一時段t2之比例為ι:ι時，燈管模組141可產生 第二亮度值之燈光。由於燈管模組141關閉的時間相等於燈管模組 141開啟的時間，所以第二亮度值之燈光約為燈管模組i4i全亮時 之50%。當控制訊號DIMc之第—時段tl與第二時段t2之比例為 μ時，燈管餘⑷可產生第三亮度值之燈光。由於燈管模組i4i 開啟的時間為關時的三倍’所以第三亮度值之燈光約為燈管模缸 201117671 141全亮時之75%。因此，藉由調整控制訊號DIM之第一時段ti 與第二時段t2之比例可使燈管模組141產生不同亮度值之燈光。 綜上所述’本發明提供-冷陰極螢紐管之驅動器以及一調光控 制之波形產生器。該冷陰極螢光燈管之驅動器包含二輸出端以及一 振盪時間輸人端’其中：輸it{端用來驅動—燈管模組^該調光控制 之波形產生器絲產生-控制訊號輸人該振财間輸人端。該調光 控制之波械生器包含-方波產生單元直流電壓產生單元以及 -輸出單元。該方波產生單元用來產生具有—第—電壓準位與一第 一電壓準位之一方波。該直流電壓產生單元用來產生具有一第三電 壓準位之-直流賴。該輸出單朋來根據_切換訊號輸出該控制 訊號’該控制訊號在-週期時間之—第—時段為該方波，且在該週 期時間之n段為該錢電壓。倾控魏號為該方波時，該 冷陰極螢紐管之驅動n蝴該燈管模組；當該控制訊號為該直流 電壓時’該冷陰極榮光燈管之‘轉關閉該燈管模組，以達成對該 燈管模組調光之目的。 Λ 以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍 所做之均特化與料，皆應屬本發明之涵蓋範圍。 【圖式簡單說明】 第1圖為先前技術之冷陰極發光燈管之驅動器之示意圖。 201117671 第2圖為本發明之冷陰極螢光燈管之驅動器之示意圖。 第3圖為本發明之控制訊號之波形圖。 第4圖為三種不同亮度之控制訊號之示意圖。 【主要元件符號說明】 100、200 101 ' 201 • 111 112 113 121 ' 123 122 、 125 124 131 • 132 141 250 251 252 253The solution of the square wave W is woven and turned on and off complementarily. When the control signal D = 2: bit % of the DC voltage D, the IC driver adds the lamp, and 141 is turned off. As shown in Fig. 3, the first W of the φγ- 4δί1旎DIM at the cycle time τ is the first-to-square wave W having the first voltage level V1 and the first signal period τ. Pressure D; that is, IC drive crying -, it2 is the second level of the DC 'module (4), and in the week _ T inside the lamp network first slave t2 in the lamp module 141 off 201117671 in this In the embodiment, the cycle time T of the control signal dim is 5 ms (that is, the frequency of the control signal DIM is 2 Hz), and the frequency of the square wave w is 5 〇 kHz. In addition, during the cycle time τ of the control signal DIM, the duration of the square wave w of the control signal DIM (the first time period t1) and the duration of the DC voltage D (the second time period determine the generation of the lamp module 141) The brightness of the first time period t1 and the second time period t2 is determined by the switching signal SD. Therefore, the control signal generated by the waveform generator 25 can achieve the purpose of dimming the lamp module 141. Referring to Figure 4, Figure 4 is a schematic diagram of three different brightness control signals. The CCFL driver 200 can drive the lamp module 141 ' according to the control signals DIMa, DIMb, D] Mc, respectively, and the lamp module 141 generates three types. Different brightness. In the control signal 〇 _, 〇 secret, 〇 face + 'the first time period 11 is the square wave ^ kg duration, the first time period t2 is the time that the DC voltage D lasts. When the control signal DIMa is the first When the ratio of '^ and tl to the first time period t2 is 1:3, the lamp module mi can generate the light of the first brightness value. Since the lamp mode, the group 141 is turned on in the first time period t1, and in the second time The time period t2 is off, that is, when the lamp module 141 is turned off. Three times, so the first-brightness value of the light is about 25% of the full brightness of the lamp module 141. When the ratio of the first period t1 of the control signal to the first time period t1 is ι:ι, the lamp mode The group 141 can generate a light of the second brightness value. Since the time when the lamp module 141 is turned off is equal to the time when the lamp module 141 is turned on, the light of the second brightness value is about 50 when the lamp module i4i is fully illuminated. When the ratio of the first period t1 of the control signal DIMc to the second period t2 is μ, the remaining lamp (4) can generate a light of the third brightness value. Since the lamp module i4i is turned on three times when the time is off. 'The light of the third brightness value is about 75% of the full brightness of the lamp cylinder 201117671 141. Therefore, the lamp module 141 can be made by adjusting the ratio of the first period ti of the control signal DIM to the second period t2. A lamp that produces different brightness values. In summary, the present invention provides a cold cathode fluorescent tube driver and a dimming control waveform generator. The cold cathode fluorescent lamp driver includes two outputs and an oscillation time. Input terminal 'where: the input it is used to drive - the lamp module ^ the dimming The waveform generator generates a control signal inputting the input end of the vibration. The dimming control of the wave generator comprises a square wave generating unit DC voltage generating unit and an output unit. The square wave generating unit is used for the square wave generating unit. Generating a square wave having a first voltage level and a first voltage level. The DC voltage generating unit is configured to generate a DC voltage having a third voltage level. The output single cell is output according to the _ switching signal. The control signal 'the control signal is the square wave during the - period of the cycle time, and the n-segment of the cycle time is the money voltage. When the control number is the square wave, the cold cathode fluorescent tube Driving the lamp module; when the control signal is the DC voltage, the 'cold cathode glory lamp' turns off the lamp module to achieve the purpose of dimming the lamp module. The above is only the preferred embodiment of the present invention, and all the specifics and materials according to the scope of the present invention should be covered by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a driver of a prior art cold cathode fluorescent lamp. 201117671 Figure 2 is a schematic view of the driver of the cold cathode fluorescent lamp of the present invention. Figure 3 is a waveform diagram of the control signal of the present invention. Figure 4 is a schematic diagram of three different brightness control signals. [Description of main component symbols] 100, 200 101 ' 201 • 111 112 113 121 ' 123 122 , 125 124 131 • 132 141 250 251 252 253
DIM、DIMa、DIMb、 SD 冷陰極螢光燈管之驅動器 積體電路驅動器 第一開關 第二開關 第三開關 電阻 電容 二極體 直流隔離電容 變壓器 燈管模組 波型產生器 方波產生單元 直流電壓產生單元 輸出單元 控制訊號 切換訊號 201117671 vcc 電源電壓 VI 第一電壓準位 V2 第二電壓準位 V3 第三電壓準位 w 方波 D 直流電壓 T 週期時間 tl 第一時段 t2 第二時段DIM, DIMa, DIMb, SD Cold cathode fluorescent lamp driver integrated circuit driver first switch second switch third switch resistance capacitor diode DC isolation capacitor transformer lamp module wave generator square wave generating unit DC Voltage generating unit output unit control signal switching signal 201117671 vcc power supply voltage VI first voltage level V2 second voltage level V3 third voltage level w square wave D DC voltage T cycle time t1 first time period t2 second time period