【修正無劃線版】 五、新型說明： 【新型所屬之技術領域】 本新型係有關一種發光元件控制電路與用於其中之短路 偵測電路’制是指-種可侧發光元件轉狀況之發光元 件控制電路與用於其中之短路偵測電路。 【先前技術】 第1圖顯示一種典型的發光二極體(light emitting devi@ LED)電源控制電路示意圖，。如第！圖所示，led電源控制電 路10用以控制LED陣列20。其中，LED電源控制電路1〇 包含複數接點T1卜T12、Tln等，分別與各咖串負向端B 連接，以接收各LED串負向端B的電流或賴訊號，並回授 控制LED陣列20。各LED串正向端a則連接於供應電壓伽。 -般而言’LED魏控制電路1()中，短路偵測以各LED 串負向端B的電壓是否高於所預設的參考值來判斷，當led 串負向端B的電壓超過所預設的參考值時，.代表此⑽串發 生短路狀況。然而，當LED電源控制電路1〇具有調光功能時， 此種判斷短路狀況的方式會發生誤判。如第2圖所示，因為調 光功能是利用調光電路11所產生之調光訊號(pwM dimming) ’以脈寬調變(PWM)方式藉由在一週期内導通與不導 通LED串的工作比來調整LED串的發光強度。然而，在調光 訊號PWM dimming使LED串不導通的期間，由於LED串沒 有電流而不產生歸，· LED㈣貞向端B電壓會接近供 應電壓V〇Ut而會超過所預設的參考值，造成誤判。因此，若 要正確觸LE时是科生瓣歧，f要在調統號卩丽 dimming為·%條件下’也就是說，在具備調光功能的led 【修正無劃線版】 電源控制晶片10中，靈[Revised non-marked version] V. New description: [New technical field] The new type of control circuit for a light-emitting element and the short-circuit detection circuit used therein refers to the state of the side-light-emitting element The light emitting element control circuit and the short circuit detecting circuit used therein. [Prior Art] Fig. 1 shows a schematic diagram of a typical light emitting diode (light emitting devi@LED) power supply control circuit. As the first! As shown, the LED power control circuit 10 is used to control the LED array 20. Wherein, the LED power control circuit 1 〇 includes a plurality of contacts T1, T12, Tln, etc., respectively connected to the negative end B of each coffee string to receive the current or the signal of the negative end B of each LED string, and feedback control LED Array 20. The forward end a of each LED string is connected to the supply voltage gamma. Generally speaking, in the LED control circuit 1 (), the short-circuit detection is judged by whether the voltage of the negative terminal B of each LED string is higher than the preset reference value, when the voltage of the negative-side terminal B of the LED string exceeds When the preset reference value is used, it represents a short circuit condition of this (10) string. However, when the LED power supply control circuit 1 has a dimming function, such a manner of determining a short circuit condition may be misjudged. As shown in FIG. 2, since the dimming function is a dimming signal (pwM dimming) generated by the dimming circuit 11 , the pulse width modulation (PWM) is used to turn on and off the LED string in one cycle. The work ratio is used to adjust the luminous intensity of the LED string. However, during the period when the dimming signal PWM dimming makes the LED string non-conducting, since the LED string has no current, no return occurs. · The LED (4) 贞 terminal B voltage will approach the supply voltage V〇Ut and exceed the preset reference value. Caused a false positive. Therefore, if you want to touch LE correctly, it is the branch of the science, f should be in the condition of the dimming dimming to %. That is to say, in the led with dimming function [corrected non-marking version] power control chip 10, spirit
陣列20是否發生短全党的狀況，才能偵測LED 況。此顯示典伽咖電源控制晶 下，都ill 制上’十分受限，甚至在大多數的狀況 都…法伽LED陣列20是否發生短路的狀況。 於此’本創作即針對上述先前技術之不足，提出一種 觸光職触況^發光元件短路之發光元件 控制電路與躲其中之短關測電路。 【新型内容】 本創作目的在提供—種發光元件控制電路與用於其中之 短路偵測電路。 為達上述之目的，就其中一觀點言，本創作提供了一種 發光兀件控制控制—發光元件陣列，該發光元件 陣歹J包3複數個發;^件串，其中每_發光元件串包含複數 ，串聯的發光元件，且每__發光元件串具有第一端及第二 端’各發光元件串之第-端連接於一共同節點，所述發光元 件控制電路包含：複域測接點，分職各發光元件串之第 二端耦接，以接收各發光元件串之第二端訊號；以及一短路 偵測電路’與該複數感測接點耦接，接收該複數第二端訊號， 並根據該複數第二端訊號與至少一參考值，以產生對應該複 數第二端訊號之複數比較訊號，進而根據該比較訊號數目是 否介於一第一設定值與一第二設定值之間，產生一短路偵測 訊號，其中該第一設定值等於或大於丨，該第二設定值等於 或小於該發光元件串總數減1，且該第一設定值小於該第二 設定值。 就另一觀點言’本創作也提供了一種用於發光元件控制 【修正無劃線版】 電路中之短路偵測電路’用以偵測一發光元件陣列是否發生短 路’該發光元件陣列包含複數個發光元件串，其中每一發光 元件串包含複數個串聯的發光元件，且每一發光元件串具有 第一端及第二端，各發光元件串之第一端連接於一共同節 點’所述用於發光元件控制電路中之短路偵測電路包含：一 比較電路，分別比較各發光元件串之第二端訊號與一參考 值，並根據比較結果產生複數比較訊號；以及一判斷電路， 與該比較電路耦接，並根據該複數比較訊號進行判斷，以於 該比較訊號數目介於一第一設定值與一第二設定值之間時， 產生一短路偵測訊號，其中該第一設定值等於或大於1，該 第二設定值等於或小於該發光元件串總數減i，且該第一設 定值小於該第二設定值。 在其中一種實施型態中，該短路债測電路更包括一短路 旗標產生電路，根據該短路偵測訊號與該複數比較訊號，以 產生短路旗標來個別顯示各發光元件串是否發生短路。 前述發光元件控制電路，宜更包含一調光電路，用以產 生一調光訊號，其藉由導通與不導通該複數發光元件串，以 控制該發光兀件陣列亮度，且該短路偵測訊號於該調光訊號 不導通該複數發光元件串時，不產生該短路偵測訊號。 底下藉由具體實施例詳加說明，當更容易瞭本創作之 目的、技術内容、特點及其所達成之功效。 【實施方式】 請參閱第3目與表1 ’顯示本創作的第一個實施例。如第 3圖所示，發光元件控制電路30，用以控制發光元件陣列， 發光元件陣列例如但不限於如圖所示之LED陣列2〇，LED陣 M434939 【修正無劃線版】 列20包含複數>(固LED串，其中每一 LED串包含複數個串聯 的LED元件，且每一 LED串具有正向端a及負向端B，各 LED串之正向端A連接於共同節點，以接收供應電壓遍。 其中’發光元件控制電路3〇包含複數感測接點T21、 T22 T23、T2n等與短路偵測電路31。感測接點丁21、、 Τ23 Τ2η刀別與各LED串之負向端Β輕接，以接收各LED 串之負向端B的訊號。短路偵測電路31與感測接點丁21、. T22 T23 T2n耗接，以接收各LED串之負向端B的訊號， 例如但不限於各負向端3的電壓訊號，並根據各負向端B的 電壓訊號與參考值之間的相對關係作綜合判斷，喊生短路 偵測訊號。 。請接著參閱表卜舉例而言，可根據負向端3的電壓訊 號超過參考值的數目，來蚊是否產生短路偵測訊號以顯示 發生祕。如表1勒，當貞向端B的電壓訊號超過參考值 的數目。’不超過第—設定值時，視為正常操作，不產生短路 憤測j。當負向端B㈣觀號超過.參考_數目，超過 第一疋值時，視為保持上一次判斷的結果，維持原有的短 路债測訊餘態。當貞向端B的電壓域超過參考值的數 目’介於第-設定值與第二設定值間，視為發生短路狀況， 產生訊號。其中，第—設定值例如可以設定為卜 第=設定值例如可設定為LED串總數減1，表示負向端B的 電壓訊號超過參考值的數目，至少有1串且少於LED串總數 時’判斷為有短路狀況。此因，當電路根據調光訊號進行PWM 調光且在PWM訊號為關閉(PWM off)的狀態時，所有LED 串均同時不導通，故若負向端B的電壓訊號超過參考值的數 目等於LED串總數時，不’宜立即確認為發生短路狀況，但若 6 【修正無劃線版】 有4刀LED串負向端B的電壓訊號超過參考值時，則可 =為發生轉狀況。如此，可以排除調光減^導通所有 —串時’誤判為短路狀況的缺點。但當然視應用的需求 而定’第-設定值不必須設定為i而可大於i;第二設定值 不必/員為LED串總數減！，而可設定為小於LED串總數的 第一端Β訊號超過參考值之數目 --—----· --—^ 短路偵測訊號 不超過第一設定值 --—---- 不產生短路偵測ιτί號 超過第二設定值 ---------- 維持原有訊號狀態 介於第一設定值與第二設定值間 ------- 產生短路偵測訊號 表1 第4圖顯示本創作第二個實施例。本實施例顯示短路偵 测電路31較具體的實施例。如第4圖所示，短路偵測電路 31包括比較電路311與判斷電路313。比較電路311，與感 測接點T2卜T22、T23、T2n搞接，分別比較各發光元件串 之負向端Β的訊號與參考值’並根據比較結果分別產生比較 訊號，其中該比較訊號為多位元的訊號，或亦可視為複數比 較訊號。判斷電路313與比較電路311耦接，並根據比較訊 號的數目，以產生短路偵測訊號。 第5圖顯示本創作第三個實施例。本實施例顯示短路偵 測電路31更具體的實施例。如第5圖所示，比較電路311 包含複數比較器3111，分別與對應的感測接點Τ21、Τ22、 Τ23.、Τ2η耦接’以分別比較各發光元件串之負向端β的訊· 號與參考值’並根據比較結果分別產生比較訊號，例如當發 M434939 【修正無劃線版】 光元件串之負向端B的訊號超過參考值時，產生比較訊號。 判斷電路313與比較電路311麵接’並計數比較訊號的數目， 以產生短路彳貞測訊號。 判斷電路313根據比較訊號的數目，例如可於比較訊號 數目介於1 (含）與發光元件串總數減丨（含）之間時，產生 短路偵測訊號；或是根據設計者需要，設定第一設定值與第 二設定值，當判斷電路313計數比較訊號數目介於第一&定 值與第二設定值之間時’產生短路侦測訊號。 第6圖顯示本創作第四個實施例。前述各實施例中，是 當任何一串或多串LED串發生短路時，產生單一的短路偵測 訊號，本實施例則顯示短路偵測電路31可更包含短路旗標產 生電路314，·以產生短路旗標來個別顯示各LED串是否發生 紐路。紐路旗標產生電路314例如可如圖所示，接收短路偵測 訊號’與各比較器3111的輸出進行邏輯運算，此等效於以短 路债測訊號作為致能訊號，控制各比較器3111的輸出，如此 即可顯示發生短路的是哪—（或多個）㈣串。 第7圖顯示本創作第五個實施例。本實施例顯示發光元 件控制電路4G另-種實施例。與第二個實施例不同的是，如 第7圖所不，發光元件控制電路40更包含調光電路43，用 以產生調光訊號’其藉由導通與不導通複數發光元件串，以 控制LED㈣2G亮度，且短路侧訊號於調光訊號不導通 ，數發光元件φ時，產生該短路侧訊號。調*訊號例如 可以直接▲她路烟靴作及邏輯運算，妓輸人比較電路 ^11 ’以停止判斷動作’亦可以輸入判斷電路413，以停止計 數動作。 、上已針對較佳實施例來說明本創作唯以上所述者， 8 M434939 【修正無劃線版】 僅係為使熟悉本技術者易於了解本創作的内容而已，並非用 來限定本創作之權利範圍。在本創作之相同精神下，熟悉本 技術者可以思及各種等效變化。例如，實施例中圖示直接連 接的兩電路或元件間，可插置不影響主要功能的其他電路或元 件；又如，實施例中顯示各比較器3111接收相同的參考值， 但此非必須，各比較器3111可接收相同或不同的參考值；又 如，發光元件不限於各實施例所示之發光二極體，亦可擴及所 有需直流控制之發光元件，如光導體等；又如，發光元件串亦 可為反接的結構，亦即供應電壓v〇ut為負電壓、且發光元件 串的負向端與供應電壓v〇ut耦接、正向端與感測接點丁2卜 T22、T23、T2n耦接，此時電路和相關訊號應做相應的調整； 又如，實施例中比較器3m的正負端可以互換.，此時比較器 3/11輸出的比較訊號將以低位準來表示該串LED的異常狀 態’而判斷電路313和短路旗標產生電路314也應做相應的改 ;又如眾所週知，史後斯觸發器trigger)係於設定的 =準轉1故如將史賴觸發器的㈣位準設定為參考值史 脚有财於比較II的仙，故史⑽觸發器亦可視 種比較ϋ。本創作的範圍應涵蓋上述及其他所有等效變 化0 【圖式簡單說明】 圖顯示i典型的LED電源控制電路示意圖。 .圖具示具有調光功能之LED電源控制電路⑺示意圖。 第3圖顯示本創作的第一個實施例。 第4圖顯示本創作第二個實施例。 第5圖顯示本創作第三個實施例。 M434939 【修IE無劃線版】 第6圖顯示本創作第四個實施例。 第7圖顯示本創作第五個實施例。 【主要元件符號說明】 10LED電源控制電路 11，43調光電路 20 LED陣列 30, 40發光元件控制電路 31短路偵測電路 311，411比較電路 3111比較器 313,413判斷電路 314短路旗標產生電路 A正向端 B負向端Whether the array 20 has a short-term situation can detect LED conditions. This shows that the gamma power control crystal is completely limited, even in most cases... whether the Fagas LED array 20 is short-circuited. In view of the above-mentioned deficiencies of the prior art, the present invention proposes a light-emitting element control circuit that is short-circuited by the light-touching device and short-circuited by the light-emitting element and a short-circuit detection circuit. [New content] The purpose of this creation is to provide a light-emitting element control circuit and a short-circuit detection circuit therefor. In order to achieve the above purpose, in one of the points of view, the present invention provides a light-emitting element control control-light-emitting element array, the light-emitting element array J package 3 multiple hairs; ^ string, wherein each _ light-emitting element string contains a plurality of light-emitting elements connected in series, and each of the light-emitting element strings has a first end and a second end. The first end of each of the light-emitting element strings is connected to a common node, and the light-emitting element control circuit comprises: a complex measurement contact point The second end of each of the light-emitting component strings is coupled to receive the second end signal of each of the light-emitting component strings; and a short-circuit detecting circuit is coupled to the plurality of sensing contacts to receive the plurality of second-end signals And generating, according to the plurality of second end signals and the at least one reference value, a plurality of comparison signals corresponding to the plurality of second end signals, and further determining whether the number of comparison signals is between a first set value and a second set value A short-circuit detection signal is generated, wherein the first set value is equal to or greater than 丨, the second set value is equal to or less than the total number of the light-emitting element strings minus 1, and the first set value is less than the second set value. According to another point of view, the present invention also provides a short-circuit detecting circuit for detecting a light-emitting element array in a light-emitting element control [corrected non-linear version] circuit. The light-emitting element array includes a plurality of a string of light-emitting elements, wherein each of the light-emitting element strings comprises a plurality of light-emitting elements connected in series, and each of the light-emitting element strings has a first end and a second end, and the first end of each of the light-emitting element strings is connected to a common node The short circuit detecting circuit used in the light-emitting element control circuit includes: a comparing circuit, respectively comparing the second end signal of each of the light-emitting element strings with a reference value, and generating a plurality of comparison signals according to the comparison result; and a determining circuit, and the Comparing the circuit, and determining, according to the plurality of comparison signals, when the number of comparison signals is between a first set value and a second set value, generating a short circuit detection signal, wherein the first set value Is equal to or greater than 1, the second set value is equal to or smaller than the total number of the light-emitting element strings minus i, and the first set value is smaller than the second set value. In one embodiment, the short circuit debt detecting circuit further includes a short circuit flag generating circuit for individually displaying whether each of the light emitting element strings is short-circuited according to the short circuit detecting signal and the complex number comparison signal to generate a short circuit flag. The light-emitting element control circuit further includes a dimming circuit for generating a dimming signal for controlling the brightness of the light-emitting element array by turning on and off the plurality of light-emitting element strings, and the short-circuit detecting signal The short circuit detection signal is not generated when the dimming signal does not turn on the plurality of light emitting element strings. The purpose of the creation, the technical content, the features and the effects achieved by the present invention are more easily explained by the detailed description of the specific embodiments. [Embodiment] Please refer to the third and Table 1 ' to show the first embodiment of the present creation. As shown in FIG. 3, the light-emitting element control circuit 30 is configured to control the light-emitting element array. For example, but not limited to, the LED array 2A shown in the figure, the LED array M434939 [corrected non-marked version] column 20 includes a plurality of LED strings, wherein each LED string comprises a plurality of LED elements connected in series, and each LED string has a positive end a and a negative end B, and the forward end A of each LED string is connected to a common node, In order to receive the supply voltage, the 'light-emitting element control circuit 3' includes a plurality of sensing contacts T21, T22 T23, T2n, etc. and the short-circuit detecting circuit 31. The sensing contacts D1, Τ23 Τ2 刀, and each LED string The negative terminal is lightly connected to receive the signal of the negative end B of each LED string. The short circuit detecting circuit 31 and the sensing contact D1, T22 T23 T2n are connected to receive the negative end of each LED string. The signal of B, such as but not limited to the voltage signal of each negative terminal 3, is based on the relative relationship between the voltage signal of each negative terminal B and the reference value, and the short-circuit detection signal is called. Please refer to For example, the voltage signal of the negative terminal 3 exceeds the reference value. The number, whether the mosquitoes produce a short-circuit detection signal to show the secret. As shown in Table 1, when the voltage signal from the end B exceeds the reference value. 'Do not exceed the first-set value, it is regarded as normal operation, does not produce Short-circuit intrusion j. When the negative end B (four) view number exceeds the reference _ number, when the first 疋 value is exceeded, it is regarded as the result of the previous judgment, maintaining the original short-circuit debt measurement state. The voltage domain exceeds the number of reference values 'between the first set value and the second set value, and is regarded as a short circuit condition, and a signal is generated. The first set value can be set, for example, to the b = the set value, for example, can be set to The total number of LED strings is reduced by 1, indicating that the voltage signal of the negative terminal B exceeds the reference value. When there are at least one string and less than the total number of LED strings, it is judged to have a short circuit condition. This is because the circuit performs PWM modulation according to the dimming signal. When the PWM signal is off (PWM off), all the LED strings are not turned on at the same time. Therefore, if the voltage signal of the negative terminal B exceeds the reference value and the number of LED strings is equal to the total number of LED strings, it should not be confirmed immediately. Short circuit condition, but if 6 Corrected no-dash version] When the voltage signal of the negative-direction terminal B of the 4-blade LED string exceeds the reference value, it can be = the rotation condition occurs. Thus, the dimming can be eliminated and the all-string can be misjudged as a short-circuit condition. Disadvantages. But of course, depending on the needs of the application, the 'set-set value does not have to be set to i but can be greater than i; the second set value does not have to be the total number of LED strings minus!, and can be set to be less than the total number of LED strings. The number of the terminal signal exceeds the reference value----------^ The short-circuit detection signal does not exceed the first set value------- does not generate short-circuit detection. The ιτί number exceeds the second set value- --------- Maintain the original signal state between the first set value and the second set value ------- Generate short circuit detection signal Table 1 Figure 4 shows the second implementation of this creation example. This embodiment shows a more specific embodiment of the short circuit detection circuit 31. As shown in Fig. 4, the short detection circuit 31 includes a comparison circuit 311 and a determination circuit 313. The comparison circuit 311 is connected to the sensing contact T2, T22, T23, and T2n, and compares the signal of the negative end of each of the light-emitting element strings with the reference value respectively, and generates a comparison signal according to the comparison result, wherein the comparison signal is A multi-bit signal can also be considered as a complex comparison signal. The determining circuit 313 is coupled to the comparing circuit 311 and generates a short circuit detecting signal according to the number of comparison signals. Figure 5 shows a third embodiment of the present creation. This embodiment shows a more specific embodiment of the short circuit detection circuit 31. As shown in FIG. 5, the comparison circuit 311 includes a plurality of comparators 3111 coupled to the corresponding sensing contacts Τ21, Τ22, Τ23., Τ2η, respectively, to respectively compare the negative ends β of the respective light-emitting element strings. The reference signal and the reference value respectively generate a comparison signal according to the comparison result. For example, when the signal of the negative end B of the optical component string of the M434939 [corrected non-linear version] exceeds the reference value, a comparison signal is generated. The judging circuit 313 is connected to the comparison circuit 311 and counts the number of comparison signals to generate a short-circuit detection signal. The determining circuit 313 generates a short-circuit detection signal according to the number of comparison signals, for example, when the number of comparison signals is between 1 (inclusive) and the total number of light-emitting element strings minus 丨 (inclusive); or according to the designer's needs, A set value and a second set value are generated when the determining circuit 313 counts the number of comparison signals between the first & fixed value and the second set value. Fig. 6 shows a fourth embodiment of the present creation. In the foregoing embodiments, when any one or more strings of LED strings are short-circuited, a single short-circuit detection signal is generated. In this embodiment, the short-circuit detection circuit 31 may further include a short-circuit flag generation circuit 314. A short-circuit flag is generated to individually indicate whether or not each LED string has a link. The New Road Flag Generation Circuit 314 can, for example, receive a short circuit detection signal 'corresponding to the output of each comparator 3111 as shown in the figure, which is equivalent to using the short circuit debt measurement signal as an enable signal to control each comparator 3111. The output, so you can see which one (or more) (four) string is shorted. Figure 7 shows the fifth embodiment of the present creation. This embodiment shows another embodiment of the light-emitting element control circuit 4G. Different from the second embodiment, as shown in FIG. 7, the light-emitting element control circuit 40 further includes a dimming circuit 43 for generating a dimming signal 'which is controlled by turning on and off a plurality of light-emitting elements. LED (4) 2G brightness, and the short-circuit side signal is not turned on when the dimming signal is turned on, and the short-circuit side signal is generated when the number of light-emitting elements φ. For example, the signal can be directly input from the stalker and the logic operation, and the input circuit ^11 ’ can be stopped to input the judgment circuit 413 to stop the counting operation. The above description has been made for the preferred embodiment, and 8 M434939 [corrected non-lined version] is only for making the content of the creation easy for those skilled in the art, and is not intended to limit the creation of this creation. The scope of rights. In the same spirit of the creation, those skilled in the art can think of various equivalent changes. For example, in the embodiment, two circuits or components directly connected may be interposed, and other circuits or components that do not affect the main function may be inserted. For example, in the embodiment, each comparator 3111 is shown to receive the same reference value, but this is not necessary. The comparators 3111 can receive the same or different reference values; for example, the light-emitting elements are not limited to the light-emitting diodes shown in the embodiments, and can also be extended to all light-emitting elements that require DC control, such as photoconductors; For example, the light-emitting element string may also be a reverse connection structure, that is, the supply voltage v〇ut is a negative voltage, and the negative end of the light-emitting element string is coupled with the supply voltage v〇ut, and the forward end and the sensing contact point 2, T22, T23, T2n are coupled. At this time, the circuit and related signals should be adjusted accordingly. For example, in the embodiment, the positive and negative terminals of the comparator 3m can be interchanged. At this time, the comparison signal output by the comparator 3/11 will be The abnormal state of the string of LEDs is indicated by a low level, and the judging circuit 313 and the short-circuit flag generating circuit 314 should also be modified accordingly; as is well known, the post-trigger trigger is set to the limit = 1 Such as the Shiray trigger (four) level Set as the reference value history foot has a wealth of comparison II, so the history (10) trigger can also be seen. The scope of this creation should cover the above and all other equivalent changes. 0 [Simple description of the diagram] The figure shows a typical LED power control circuit diagram. The figure shows a schematic diagram of an LED power supply control circuit (7) with dimming function. Figure 3 shows the first embodiment of the present work. Figure 4 shows a second embodiment of the present creation. Figure 5 shows a third embodiment of the present creation. M434939 [Finishing IE without underline version] Fig. 6 shows the fourth embodiment of the present creation. Figure 7 shows the fifth embodiment of the present creation. [Main component symbol description] 10LED power supply control circuit 11, 43 dimming circuit 20 LED array 30, 40 light-emitting element control circuit 31 short-circuit detection circuit 311, 411 comparison circuit 3111 comparator 313, 413 judgment circuit 314 short-circuit flag generation circuit A positive Negative end to end B
Til, T12, Tin, T21, T22, T23，T2n感測接點 Vout供應電壓Til, T12, Tin, T21, T22, T23, T2n sense contact Vout supply voltage