201123663 發明說明： 【發明所屬之技術領域】 [0001] [0002] 098144094 本發明係有關於一種保護裝置，其，尤指一種電源供 應器之短路保護裝置。 【先前技術】 按，不論在電腦或其他電器内部，通常都設有電源保 護的電路，用來偵測系統電源的穩定與否，並於系統電 源發生異常時，及時啟動保護機制，或關掉電源’或發 出警示訊號’以使系統在電源產生異常時，能將損害降 到最低程度。對於高階電子產品而言，例知電腦、電源 保護的機制更是不可獲缺》 電源保護的標的通常有針對系統的電壓、電源或是負 載等來進行。例如針對電壓，使用者可藉由制系統電 源電壓的過兩（Over Vo 11age)或過低(under Voltage) ’同理’若針對電流則可偵測過電流（〇ver201123663 Description of the Invention: [Technical Field] [0001] [0002] The present invention relates to a protection device, and more particularly to a short circuit protection device for a power supply. [Prior Art] Press, whether in the computer or other electrical appliances, usually have a power protection circuit to detect the stability of the system power supply, and when the system power supply is abnormal, start the protection mechanism in time, or turn off The power supply 'or warning signal' is used to minimize damage when the power supply is abnormal. For high-end electronic products, it is known that the mechanism of computer and power protection is indispensable. The standard of power protection is usually carried out for the voltage, power supply or load of the system. For example, for the voltage, the user can use the system's power supply voltage to exceed the two (Over Vo 11age) or under voltage 'under the same'. If the current is used, the overcurrent can be detected (〇ver
Current) ’而若針對負載則可偵測其過^(〇ver Loading) 來確保系統運作於—安全的環境中。 在電腦系統領域中’通常係利用]貞測系統電源電壓的 過局（〇Ver Voltage)或過低（Under Voltage)，來保 護系統，而為了確保系統之高可靠度，在進行電壓過高 或過低的偵測時，並不是只單純考慮電壓的大小，而是 採取回授的概念，同時偵測一電源品質輸入訊號（P〇werCurrent) ‘and for load, it can be detected by ^(〇ver Loading) to ensure that the system operates in a safe environment. In the field of computer systems, 'usually using the system' to check the system's power supply voltage (〇Ver Voltage) or under voltage (Under Voltage) to protect the system, and to ensure the system's high reliability, the voltage is too high or When the detection is too low, it is not just the size of the voltage, but the concept of feedback, while detecting a power quality input signal (P〇wer
Good Input signal，pgi signai),來判斷系統電源 的好壞。 請參閱第一圖，係為習知技術之電源供應器的短路保 護裝置。如圖所示，電源供應器包含一整流/滤波電路1〇 表單編號麵 a 4頁/共18 s 〇982075454 201123663 ’、一脈波寬度調整電路11’ 、一整流電路12’ 、一輸 出電感14’與一輸出電容16’ 。整流/濾波電路10’係接 收一交流輸入訊號而整流並濾波該交流輸入訊號，以供 應電壓至一變壓器18’ ，脈波寬度調整電路11’係依據 電源供應器之輸出狀態而控制變壓器18’導通/截止，整 流電路12’耦接電源供應器之變壓器18’的二次側，輸 出電感14’之一端耦接整流電路12’ ，輸出電容16’之 一端耦接輸出電感14’之另一端，以輸出電源供應器之 輸出電壓，輸出電容16’之另一端耦接於接地端。習知 技術之一保護電路20’係耦接整流電路12’ ，以偵測電 源供應器之輸入電壓的電位大小，當系統開機時，保護 電路20’的低電壓保護不能先啟動，否則，系統之輸出 電源還沒有上來，就先被保護電路20’判定為低電壓而 產生誤動作，因此必須先等電源供應器的電源正常供應 一段時間後，啟動保護電路20’的低電壓保護功能，才 不會產生誤動作。而電源供應器正常與否，通常可藉由 一電源品質輸入（Power Good Input:，PGI)訊號來得知 。若系統電源正常，電源品質輸入訊號則會上來，此時 保護電路20’即可因應電源品質輸入訊號，來啟動其内 的低電壓保護功能，如此則可免除上述誤動作的發生。 然而，請一併參閱第二圖，係為習知技術之短路保護 裝置的時序圖。如圖所示，由於一般電源品質輸入訊號 為電源供應器之整流電路12’與輸出電感14’之間的訊 號，在保護電路20’中，用於判斷是否進行低電壓保護 或過電流保護的功能，也就是當電源品質輸入訊號啟動 時，保護電路20’對電源供應器之輸出電壓進行監控； 098144094 表單編號A0101 第5頁/共18頁 0982075454-0 201123663 反之，當電源品質輸入訊號沒有被啟動時，保護電路20 ，則不對輸出電壓進行監控（如第二圖所示），也因為如 此，在變壓器1 8 ’之二次側的整流電路1 2 ’的輪出或是 整流電路12，中的飛輪二極體D2發生短路現象時，電源 品質輸入訊號無法即時啟動保護電路20，而使電源供應 器損壞。 因此，如何針對上述問題而提出一種新顆電源供應 之短路保護裝置，其可避免電源品質輸入訊號無法即時 啟動保護電路20’而使電源供應器損壞的缺點。 【發明内容】 [0003] 本發明之目的之一，在於提供一種電源供應器之短路 保護電路，其藉由一偵測電路設置於電源供應器之 備電源之一變壓器，使在電源供應器之一整流電路發生 短路時’一電源品質輸入訊號仍可啟動保護電路進行保 護。 本發明之目的之一，在於提供一種電源供應器之短路 保護電路，其藉由一開機訊號與電源品質輸入訊號，而 避免系統不開機時就發生啟動保護的誤動作現象。 本發明之電源供應器之短路保護裝置包含一保護電路 。保護電路設置於電源供應器之一預備電源之—變壓器 ，以操取預備電源之變壓器之一電源品質輸入訊號，並 接收一開機訊號’保護電路依據電源品質輸入訊號與開 機訊號，以保護電源供應器。如此，在電源供應器之一 整流電路發生短路時，電源品質輸入訊號仍可啟動保護 電路進行保護。 098144094 表單煸號A0101 第6頁/共18頁 0982075454-0 201123663 [0004] 實施方式】 茲為使貴審查委員對本發明之結構特徵及所達成之 功效有更進一步之瞭解與認識，謹佐以較佳之實施例及 配合詳細之說明，說明如後： ❹ Ο 請參閱第三圖’係為本發明之一較佳實施例之電源供 應器的短路保護裝置的電路圖。如圖所示，本發明之短 路保護裝置10係應用於電源供應器20，電源供應器20包 含一整流/濾波電路22、一脈波寬度調變模組24、一主要 電源26與一預備電源28。整流/濾波電路22接收一交流輸 入訊號，而整流/渡波該交流輸入訊號，以供應電壓至主 要電源26與預備電源28。脈波寬度調變模組包含一主脈 波寬度調變電路240與一副脈波寬度調變電路242。主脈 波寬度調變電路240與副脈波寬度調變電路242係分別依 據電源供應器20之輸出狀態，而控制主要電源26與預備 電源28導通/截止。上述之主要電源26包含一第一變壓器 260、一第一整流電路262、一场出黃感264與一第一輸 出電容266。第一變壓器260係耦接脈波寬度調整模組24 ，而產生一第一輸入訊號’第一整流電路262接收並整流 第一輸入訊號而輸出該第一輸入訊號，輸出電感264之一 端耦接第一整流電路262，第一輸出電容266之一端耦接 輸出電感264之另一端，第一輸出電容266之另一端耦接 接地端’以接收第一輸入訊號而產生一第一輸出訊號， 並輸出該第一輸出訊號。其中，第一整流電路262包含一 第一二極體2620與一第二二極體2622。第一二極體2620 之一端耦接第一變壓器260，第二二極體2622之一端麵接 第一二極體2620之另一端，第二二極體2622之另一端耦 098144094 表單編號Α0101 第7頁/共18頁 0982075454-0 201123663 接於接地端。 同理，預備電源28包含一第二變壓器280、_第二敦 流電路282、一第二輪出電容284與短路保護裝置1〇。第 二變壓器280係耦接脈波寬度調整模組24，而產生—第二 輸入訊號，第二整流電路282接收並整流第二輸入訊號而 輸出該第二輸入訊號，第二輸出電容284之一端耦接第二 整流電路282，第二輸出電容284之另一端耦接於接地端 ，以接收第二輸入訊號而產生一第二輸出訊號，並輪出 該第二輸出訊號。 承上所述’本發明之短路保護裝置1〇包含一保護電路 14。保護電路14係設置於電源供應器2〇之預備電源28之 第二變壓器280，保護電路14係.擷取預備電源28之第二變 壓器280之一電源品質輸入訊號（Power'Good Input， PGI) ’並接收一開機訊號，保護電路14依據電源品質輸 入訊號與開機訊號，以保護電源供應器20。即由於預備 電源28在電源供應器20接收交流輸入訊號時，預備電源 28即會開始運作，所以，當保護電路14設置於預僙電源 28時，在電源供應器20接收交流輸入訊號時，保護電路 14即會開始擷取電源供應器20之預備電源28的電源品質 輸入訊號。如此，在電源供應器20之主要電源26的第一 整流電路262之輸出、第一整流電路262之第二二極體 2622或是預備電源28之第二整流電路282發生短路時， 保護電路14仍可透過預備電源28的輔助繞組而擷取電源 品質輸入訊號，以依據電源品質輸入訊號而啟動，進而 進行保護。 此外，由於保護電路14依據電源品質輸入訊號與開機 098144094 表單編號A0101 第8頁/共18頁 0982075454-0 201123663 訊號，以保護電源供應器20，即保護電路14透過開機訊 號，而於系統關機時，保護電路14則不啟動，當系統開 機時，保護電路14即可依據電源品質輸入訊號而對電源 供應器20進行保護，如此，本發明可藉由開機訊號而避 免系統不開機時就發生啟動保護的誤動作現象。 請復參閱第三圖，本發明之電源供應器的短路保護裝 置更包括一整流電路16。整流電路16係設置於預備電源 28之第二變壓器280，以產生電源品質輸入訊號。其中，Good Input signal, pgi signai), to determine the quality of the system power. Please refer to the first figure, which is a short-circuit protection device for the power supply of the prior art. As shown in the figure, the power supply includes a rectifying/filtering circuit 1 〇 form number plane a 4 pages / total 18 s 〇 982075454 201123663 ', a pulse width adjusting circuit 11', a rectifying circuit 12', an output inductor 14 'With an output capacitor 16'. The rectifying/filtering circuit 10' receives an AC input signal and rectifies and filters the AC input signal to supply a voltage to a transformer 18'. The pulse width adjusting circuit 11' controls the transformer 18' according to the output state of the power supply. Turning on/off, the rectifier circuit 12' is coupled to the secondary side of the transformer 18' of the power supply, one end of the output inductor 14' is coupled to the rectifier circuit 12', and one end of the output capacitor 16' is coupled to the other end of the output inductor 14'. To output the output voltage of the power supply, the other end of the output capacitor 16' is coupled to the ground. One of the prior art protection circuits 20' is coupled to the rectifier circuit 12' to detect the potential of the input voltage of the power supply. When the system is powered on, the low voltage protection of the protection circuit 20' cannot be started first. Otherwise, the system If the output power supply has not yet come up, it is first determined to be a low voltage by the protection circuit 20', and a malfunction occurs. Therefore, it is necessary to start the low voltage protection function of the protection circuit 20' after the power supply of the power supply is normally supplied for a period of time. Will cause a malfunction. The power supply is normal or not, and can usually be learned by a Power Good Input (PGI) signal. If the system power is normal, the power quality input signal will come up. At this time, the protection circuit 20' can activate the low voltage protection function according to the power quality input signal, so that the above malfunction can be avoided. However, please refer to the second figure together with the timing diagram of the short-circuit protection device of the prior art. As shown in the figure, since the general power quality input signal is a signal between the rectifier circuit 12' of the power supply and the output inductor 14', in the protection circuit 20', it is used to determine whether to perform low voltage protection or overcurrent protection. Function, that is, when the power quality input signal is activated, the protection circuit 20' monitors the output voltage of the power supply; 098144094 Form No. A0101 Page 5 of 18 0982075454-0 201123663 Conversely, when the power quality input signal is not At startup, the protection circuit 20 does not monitor the output voltage (as shown in the second figure), and because of this, the turn-off of the rectifier circuit 1 2 ' on the secondary side of the transformer 18' or the rectifier circuit 12, When the flywheel diode D2 is short-circuited, the power quality input signal cannot immediately activate the protection circuit 20, and the power supply is damaged. Therefore, how to solve the above problem is to provide a short-circuit protection device for a new power supply, which can avoid the disadvantage that the power quality input signal cannot immediately activate the protection circuit 20' and damage the power supply. SUMMARY OF THE INVENTION [0003] One of the objects of the present invention is to provide a short circuit protection circuit for a power supply, which is provided in a power supply of a power supply by a detection circuit, and is provided in the power supply. When a rectifier circuit is short-circuited, a power quality input signal can still activate the protection circuit for protection. One of the objects of the present invention is to provide a short-circuit protection circuit for a power supply, which can prevent a malfunction of the startup protection when the system is not turned on by inputting a signal with a power-on signal and a power quality. The short circuit protection device of the power supply of the present invention comprises a protection circuit. The protection circuit is disposed in a power supply of the power supply, the transformer is used to operate the power quality input signal of the transformer of the standby power supply, and receives a power-on signal. The protection circuit inputs the signal and the power-on signal according to the power quality to protect the power supply. Device. Thus, when a short circuit occurs in one of the power supply rectifier circuits, the power quality input signal can still activate the protection circuit for protection. 098144094 Form nickname A0101 Page 6 / 18 pages 0982075454-0 201123663 [0004] [Embodiment] In order to enable your review board to have a better understanding and understanding of the structural features and effects of the present invention, The preferred embodiment and the detailed description are as follows: ❹ Ο Refer to the third figure, which is a circuit diagram of a short-circuit protection device for a power supply according to a preferred embodiment of the present invention. As shown in the figure, the short circuit protection device 10 of the present invention is applied to a power supply 20, and the power supply 20 includes a rectifying/filtering circuit 22, a pulse width modulation module 24, a main power source 26 and a standby power source. 28. The rectifying/filtering circuit 22 receives an AC input signal and rectifies/crosses the AC input signal to supply a voltage to the main power source 26 and the backup power source 28. The pulse width modulation module includes a main pulse width modulation circuit 240 and a pair of pulse width modulation circuit 242. The main pulse width modulation circuit 240 and the sub-pulse width modulation circuit 242 control the main power source 26 and the standby power source 28 to be turned on/off according to the output state of the power supply unit 20, respectively. The main power source 26 includes a first transformer 260, a first rectifier circuit 262, a field yellow 264 and a first output capacitor 266. The first transformer 260 is coupled to the pulse width adjusting module 24 to generate a first input signal. The first rectifier circuit 262 receives and rectifies the first input signal to output the first input signal, and the one end of the output inductor 264 is coupled. a first rectifying circuit 262, one end of the first output capacitor 266 is coupled to the other end of the output inductor 264, and the other end of the first output capacitor 266 is coupled to the ground end to receive a first input signal to generate a first output signal, and The first output signal is output. The first rectifier circuit 262 includes a first diode 2620 and a second diode 2622. One end of the first diode 2620 is coupled to the first transformer 260, one end of the second diode 2622 is connected to the other end of the first diode 2620, and the other end of the second diode 2622 is coupled to 098144094. Form No. Α0101 7 pages / a total of 18 pages 0982075454-0 201123663 connected to the ground. Similarly, the backup power supply 28 includes a second transformer 280, a second dc circuit 282, a second wheel ejector 284, and a short circuit protection device 〇. The second transformer 280 is coupled to the pulse width adjustment module 24 to generate a second input signal, the second rectifier circuit 282 receives and rectifies the second input signal to output the second input signal, and the second output capacitor 284 is terminated. The second output circuit 284 is coupled to the ground to receive a second input signal to generate a second output signal, and to rotate the second output signal. The short circuit protection device 1 of the present invention comprises a protection circuit 14. The protection circuit 14 is disposed on the second transformer 280 of the standby power source 28 of the power supply 2, and the protection circuit 14 is a power quality input signal (Power'Good Input, PGI) of the second transformer 280 of the standby power source 28. And receiving a power-on signal, the protection circuit 14 inputs the signal and the power-on signal according to the power quality to protect the power supply 20. That is, since the backup power source 28 receives the AC input signal from the power supply 20, the backup power source 28 starts to operate. Therefore, when the protection circuit 14 is disposed on the pre-power source 28, when the power supply 20 receives the AC input signal, the protection is performed. The circuit 14 will begin to draw power quality input signals from the preliminary power source 28 of the power supply 20. Thus, when the output of the first rectifier circuit 262 of the main power source 26 of the power supply 20, the second diode 2622 of the first rectifier circuit 262 or the second rectifier circuit 282 of the standby power source 28 is short-circuited, the protection circuit 14 The power quality input signal can still be extracted through the auxiliary winding of the standby power source 28 to be activated according to the power quality input signal, thereby protecting. In addition, since the protection circuit 14 inputs the signal according to the power quality and the 098144094 form number A0101 page 8 / 18 pages 0982075454-0 201123663 signal to protect the power supply 20, that is, the protection circuit 14 transmits the power-on signal, and when the system is powered off The protection circuit 14 is not activated. When the system is powered on, the protection circuit 14 can protect the power supply 20 according to the power quality input signal. Thus, the present invention can prevent the system from starting when the system is not turned on by the power-on signal. The malfunction of protection. Referring to the third figure, the short circuit protection device of the power supply of the present invention further includes a rectifier circuit 16. The rectifier circuit 16 is disposed on the second transformer 280 of the preliminary power source 28 to generate a power quality input signal. among them,
整流電路16包括一第三二極體16〇。第三二極體16〇之一 端耦接於第二變壓器2⑽之一輔助繞組，以進行整流並產 生電源品質輸入訊號。此外，整流電路16秉包含—第四 二極體162與一第三輸出電_6#|^‘二;^_162之一 端耦接第三二極體160，第四二極齄162之另一端耦接於 接地端，第三輸出電容164耦接整流電路，以輸出電源品 質輸入訊號’即第三輸出電容164之一端耦接第三二極體 160與第四二極體162 ’而第三輸出電容ι:β4之另一端鉍 接於接地端，以輸出電源品食辞入紈號。其中，第四二 極體162為一飛輪二極體。 凊參閱第四圖’係為本發明之一較佳實施例之保護電 路的方塊圖。如圖所示，本發明之保護電路14包含一選 擇單元140、一控制單元丨42、一低電壓偵測電路丨44與 一及閘146。選擇單元140依據開機訊號，而選擇輸出電 源品質輸入訊號或一低準位訊號，控制單元142接收電源 品質輸入訊號或低準位訊號，並依據電源品質輸入訊號 ，而產生一控制訊號，即當系統開機時，則會產生開機 訊號，選擇單元140接收到開機訊號時，則選擇輪出電源 098144094 表軍編號 A01G1 第 9 頁/共 18 ΐ 0982075454-0 201123663 品質輸入訊號至控制單元142，控制單元142再依據電源 品質輸入訊號而產生控制訊號；當系統關機時，則不會 產生開機訊號，此時，選擇單元140則輸出低準位訊號至 控制單元142，控制單元142則對應低準位訊號而輸出控 制訊號，以控制保護電路14不對電源供應器進行保護， 如此，本發明藉由開機訊號產生與否，而避免系統不開 機時就發生啟動保護的誤動作現象。 低電壓偵測電路14 4接收並偵測電源供應器2 0之一輸 出電壓，產生一低電壓偵測訊號，及閘146接收低電壓偵 測訊號與控制訊號，雨產生保護讓號’以裁止電源供應 器20，即及閘146同時接收到低電塵偵測訊號與控制訊號 為高準位訊號時，則輸出保護;訊號，以對電源供應器2〇 進行保護，也就是說，當低電壓偵測電夸:144偵測到電源 供應器20之輸出電壓過低，並且系統正處於開機狀態時 ’保護電路14則輸出保護訊號，以對電源供應器2〇進行 保護。 此外’保護電路1:4更包."I —延遲單.元148與一防彈跳 電路149。延遲單元148耦接低電壓偵測電路144，並延 遲低電壓偵測訊號，以確保低電壓偵測電路144所偵測之 電源供應器20之輸出電壓確實處於低電壓的狀態，而非 短暫位於低電壓的狀態。再者，防彈跳電路149耦接選擇 單元140，並接收開機訊號，而輸出開機訊號至選擇單元 140，以確保系統是處於開機狀態。其中，選擇單元14〇 為—多工器。 "月一併參閱第五圖，係為本發明之一較佳實施例之短 當電源供應器2〇耦接 0982075454-0 路保護裝置的時序圖。如圖所示， 098144094 表單編號A0101 第10頁/共18頁 201123663 —電源時’即電源供應器2〇接 明之短路保《置的保護電路14則;二本發 ，糊源供應器2G之輪出電壓截/時二= 之電源品貝輸人訊號仍可透過 路14進行保護。 以以而啟動保護電 綜上所述本發明之電源供應器之短 -保護電路設置於電源供Μ裝置藉由 ，以擷取預備電源之變愚變壓器 Ο 接收一開機訊號 電源品質輸入訊號，並 …，保護電路依據電源品 機訊號，以保護電源供應器。如此，h訊戒與開 整流電路發生短路時，電雜應器之一 電路進行賴。 崎树啟動保護 ===法所規定之專利申·件無疑，要 祈釣局早日賜准專利，至感 馬禱。 Ο ,m者’僅為本發明之一較佳實施例而已，並 _來限定本㈣實施之範圍，舉凡依本發明申請專利 範圍所速之純、構造、特徵及精神所為之均等變化與 修飾，均應包括於本發明之申請專利範圍内。 【圖式簡單說明】 [0005] 第一圖係為習知技術之電源供應器的短路保護裝置； 第二圖係為習知技術之短路保護裝置的時序圖； 第三圖係為本發明之一較佳實施例之電源供應器的短路 保護裝置的電路圖； 098144094 0982075454-0 第四圖係為本發明之一較佳實施例之保護電路的方塊圖 表單編號A0101 第11頁/共18頁 r 201123663 ;以及 第五圖係為本發明之一較佳實施例之短路保護裝置的時 序圖。 【主要元件符號說明】 [0006] 098144094 習知技術： 12’整流電路 14’電感 16’輸出電容 18’變壓器 | 20’保護電路 本發明： 11短路保護裝置 14 保護電路 140選擇單元 142控制單元 144低電壓偵測電路 146及閘 丨 148延遲單元 14 9防彈跳電路 16 整流電路 160第三二極體 162第四二極體 164第三輸出電容 20 電源供應器 22 整流/濾波電路 24 脈波寬度調整模組 表單編號A0101 第12頁/共18頁 0982075454-0 201123663 240主脈波寬度調整電路 242副脈波寬度調整電路 26 主要電源 260第一變壓器 263第一整流電路 2620第一二極體 2622第二二極體 264電感 266第一輸出電容 28 預備電源 280第二變壓器 282第二整流電路 284第二輸出電容The rectifier circuit 16 includes a third diode 16 〇. One end of the third diode 16 is coupled to one of the auxiliary windings of the second transformer 2 (10) for rectification and generates a power quality input signal. In addition, the rectifier circuit 16 includes a fourth diode 162 and a third output power _6#|^'2; one end of the ^_162 is coupled to the third diode 160, and the other end of the fourth diode 162 The third output capacitor 164 is coupled to the rectifier circuit to output the power quality input signal, that is, one end of the third output capacitor 164 is coupled to the third diode 160 and the fourth diode 162 ′ and the third The other end of the output capacitor ι:β4 is connected to the ground terminal to nickname the output power supply. The fourth diode 162 is a flywheel diode. Referring to Figure 4, a block diagram of a protection circuit in accordance with a preferred embodiment of the present invention is shown. As shown, the protection circuit 14 of the present invention includes a selection unit 140, a control unit 丨42, a low voltage detection circuit 丨44 and a NAND gate 146. The selecting unit 140 selects an output power quality input signal or a low level signal according to the power-on signal, and the control unit 142 receives the power quality input signal or the low level signal, and generates a control signal according to the power quality input signal, that is, when When the system is powered on, a power-on signal is generated. When the selection unit 140 receives the power-on signal, it selects the power source 098144094. The number of the army is A01G1. Page 9 of 18 982 0982075454-0 201123663 Quality input signal to the control unit 142, control unit 142, according to the power quality input signal to generate a control signal; when the system is turned off, no start signal is generated, at this time, the selection unit 140 outputs a low level signal to the control unit 142, and the control unit 142 corresponds to the low level signal The control signal is output to prevent the protection circuit 14 from protecting the power supply. Therefore, the present invention avoids the malfunction of the startup protection when the system is not turned on by the startup signal. The low voltage detecting circuit 14 4 receives and detects one of the output voltages of the power supply 20 to generate a low voltage detecting signal, and the gate 146 receives the low voltage detecting signal and the control signal, and the rain generates a protection sign. When the power supply 20 and the gate 146 receive the low-dust detection signal and the control signal as the high-level signal at the same time, the protection is output; the signal is used to protect the power supply 2〇, that is, when Low voltage detection electric boast: 144 detects that the output voltage of the power supply 20 is too low, and the system is in the on state, the protection circuit 14 outputs a protection signal to protect the power supply 2 . Further, the 'protection circuit 1:4 is further packaged." I - delayed single element 148 and a bounce circuit 149. The delay unit 148 is coupled to the low voltage detection circuit 144 and delays the low voltage detection signal to ensure that the output voltage of the power supply 20 detected by the low voltage detection circuit 144 is indeed at a low voltage, rather than being temporarily located. Low voltage state. Moreover, the anti-bounce circuit 149 is coupled to the selection unit 140 and receives the power-on signal, and outputs a power-on signal to the selection unit 140 to ensure that the system is powered on. The selection unit 14 is a multiplexer. "Monthly, refer to the fifth figure, which is a short circuit diagram of a preferred embodiment of the present invention when the power supply 2 is coupled to the 0982075454-0 road protection device. As shown in the figure, 098144094 Form No. A0101 Page 10 / Total 18 Page 201123663 - Power supply 'that is, the power supply 2〇 is short-circuited to protect the "protection circuit 14"; two hair, the source of the paste source 2G The power supply output signal of the output voltage cut/time 2 = can still be protected by the road 14. So that the short-protection circuit of the power supply of the present invention is activated by the power supply device, and the power supply device receives the power-on signal input signal. ..., the protection circuit is based on the power supply signal to protect the power supply. In this way, when the h signal is short-circuited with the open rectifier circuit, one of the circuits of the electric hybrid device is used. Sakishu initiates protection === The patent application required by the law is undoubtedly, and the Prayer Bureau must grant the patent as soon as possible. Ο , m ' is only a preferred embodiment of the present invention, and _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ All should be included in the scope of the patent application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS [0005] The first figure is a short circuit protection device of a power supply of the prior art; the second figure is a timing chart of a short circuit protection device of the prior art; A circuit diagram of a short circuit protection device of a power supply of a preferred embodiment; 098144094 0982075454-0 The fourth figure is a block diagram of a protection circuit according to a preferred embodiment of the present invention. Form No. A0101 Page 11 of 18 201123663; and fifth figure are timing diagrams of the short circuit protection device according to a preferred embodiment of the present invention. [Main component symbol description] [0006] 098144094 Conventional technology: 12' rectifier circuit 14' inductor 16' output capacitor 18' transformer | 20' protection circuit The present invention: 11 short circuit protection device 14 protection circuit 140 selection unit 142 control unit 144 Low voltage detection circuit 146 and gate 148 delay unit 14 9 bounce circuit 16 rectifier circuit 160 third diode 162 fourth diode 164 third output capacitor 20 power supply 22 rectification / filter circuit 24 pulse width Adjustment module form number A0101 Page 12/18 page 0982075454-0 201123663 240 main pulse width adjustment circuit 242 auxiliary pulse width adjustment circuit 26 Main power supply 260 First transformer 263 First rectifier circuit 2620 First diode 2622 Diode 264 inductor 266 first output capacitor 28 standby power supply 280 second transformer 282 second rectifier circuit 284 second output capacitor
098144094 表單編號A0101 第13頁/共18頁 0982075454-0098144094 Form No. A0101 Page 13 of 18 0982075454-0