1309000 九、發明說明： 【發明所屬之技術領域】 一一 本發明係關於一種報警電路，尤係一種CPU風扇停 轉報警電路。 【先前技術】 中央處理器（CPU)係電腦系統中最爲重要組成部分 之一 ’隨著CPU工作主頻之提升，其功耗及發熱量也在 不斷提升’而CPU之溫度直接影響到電腦工作之穩定， 這就需要CPU風扇在CPU工作時將其産生之熱量及時擴 散。在電腦工作時如果CPU風扇停止轉動，例如被異物 卡住、電源接觸不良及風扇損壞等原因引起之CPU風扇 無法轉動，就會使CPU産生之熱量不能及時散發，造成 CPU溫度過高，使電腦頻繁死機，甚至造成CPU燒毀。 爲了使電腦穩定工作，保證CPU之散熱正常，就需 要對風扇之工作狀態進行有效監測，以便及時發現問題並 處理。 【發明内容】 鑒於以上内容’有必要提供一種CPU風扇停轉報警 電路’以監測CPU風扇是否正常工作。 一種CPU風扇停轉教警電路，其包括一 CPU風扇、 一監視電路及一報警裝置，該CPU風扇包括一轉子訊號 引聊，该轉子訊號引腳在讀CPU風扇工作及停止時分別 輸出一交替變化之TTL電平訊號及—恒定電壓訊號，其 與5亥li視電路連接，該彳見電路與該報警裝置連接，該監 6 I3〇?〇〇〇 免路根據該轉子訊號引腳輸出之電平訊號判斷該CPU ::之工作狀態，並在該CPU風扇停止工作時啓動該報 電腦開始工作後，該CPU風扇停轉報警電路之政視 電路即開始監視CPU風扇之工作狀態，在CPU : 工作時啓動該報警裝置報警。 羽τ 【實施方式】1309000 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to an alarm circuit, and more particularly to a CPU fan stop alarm circuit. [Prior Art] The central processing unit (CPU) is one of the most important components of a computer system. As the CPU frequency increases, its power consumption and heat generation are also increasing. The CPU temperature directly affects the computer. The stability of the work, which requires the CPU fan to spread the heat generated by the CPU in time. If the CPU fan stops rotating when the computer is working, for example, the CPU fan cannot be rotated due to foreign matter jamming, poor power supply contact, and fan damage, the heat generated by the CPU cannot be dissipated in time, causing the CPU temperature to be too high, causing the computer to become Frequent crashes and even CPU burnout. In order to make the computer work stably and ensure the heat dissipation of the CPU is normal, it is necessary to effectively monitor the working state of the fan so that problems can be found and dealt with in time. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a CPU fan stall warning circuit to monitor whether the CPU fan is operating normally. A CPU fan stalling police circuit includes a CPU fan, a monitoring circuit and an alarm device. The CPU fan includes a rotor signal chatter, and the rotor signal pin outputs an alternate change when the CPU fan is operated and stopped. The TTL level signal and the constant voltage signal are connected to the 5 haili circuit, and the glimpse circuit is connected with the alarm device, and the monitor 6 I3 〇 〇〇〇 〇〇〇 根据 根据 according to the output of the rotor signal pin The flat signal judges the working state of the CPU: and starts the work of the computer when the CPU fan stops working. After the CPU fan stops the alarm circuit, the political circuit begins to monitor the working state of the CPU fan, in the CPU: The alarm device alarm is activated during work. Feather τ [Embodiment]
請參閱圖1，一種CPU風扇停轉報警電路1〇，其包 括一 CPU風扇12、一監視電路14及一報警裝置16 = CPU風扇12包括-電源引腳vcc、一轉子訊號引腳 及一接地引腳GND，該報警裝置16爲一蜂鳴器，其包括 一電源正極v+及一電源負極v_，該監視電路14包括複 數電晶體Q1〜Q3、複數電阻m〜R5、兩電容C1和c2、 兩二極體D1和D2及一 12V電源。 該CPU風扇12之電源引腳vcc與該監視電路14之 12V電源連接，該CPU風扇12之接地引腳GND接地， s亥CPU風扇12之轉子訊號引腳Tach〇透過該監視電路μ 中電阻R1與該電晶體Q1之基極連接，該電晶體Q1之集 極與該12V電源連接，該電晶體Qi之射極透過該電阻 R2接地，該電晶體Q1之射極還透過該電容C1與該二極 體D1之正極連接，該二極體之負極分別與該電容〇 及該二極體D1之正極連接，該二極體D2之正極接地， 該二極體D1之負極透過該電阻R3與該電晶體Q2之基極 連接，該電容C2 —端分別與該二極體D1之負極及該電 7 1309000 、 \ 阻R3連接，該電容C2另一端接地，該電晶體Q2之射極 接地，該電晶體Q2之集極透過該電阻R5與該12V電源 連接，該電晶體Q2之集極還與該電晶體Q3之基極連接， 該電晶體Q3之射極接地，該電晶體Q3之集極與該報警 ' 裝置16之電源負極V-連接，該報警裝置16之電源正極 V+透過該電阻R4與該12V電源連接。 該電晶體Q1~Q3均爲NPN型電晶體，該電阻R2之 電阻值爲IKOhm，該電容C1之電容值爲luF。 • 電腦啓動後該CPU風扇12開始工作，其轉子訊號引 腳Tacho輸出一交替變化之TTL電平訊號，在通過該監 視電路14之電晶體Q1後産生一脈衝型偏置電流，從而 在該電阻R2兩端産生脈衝電壓，該脈衝電壓依次通過該 電容C1耦合、二極體D1檢波及電容C2濾波後，轉變爲 平滑之直流電壓，該直流電壓使該電晶體Q2導通，電晶 體Q3截止，該報警裝置16關閉；當CPU風扇12停止轉 ^ 動時，該轉子訊號引腳Tacho輸出一恒定電壓訊號，使該 監視電路14之電晶體Q1産生一恒定之偏置電流，從而 在該電阻R2兩端産生一恒定電壓，此時通過該電容C1 及二極體D1後無電壓輸出，因此該電晶體Q2截止，該 電晶體Q3導通，該報警裝置16啓動，發出警報。 綜上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施例，舉凡 熟悉本案技藝之人士，在爰依本發明精神所作之等效修飾 或變化，皆應涵蓋於以下之申請專利範圍内。 1309000 « i j 【圖式簡單說明】二L二.1V二ili 圖1係本發明CPU風扇停轉報警電路較佳實施方式之 電路圖。 【主要元件符號說明】Referring to FIG. 1 , a CPU fan stall warning circuit 1 〇 includes a CPU fan 12 , a monitoring circuit 14 and an alarm device 16 = CPU fan 12 includes a power pin vcc, a rotor signal pin and a ground. The alarm device 16 is a buzzer, and includes a power source positive pole v+ and a power source negative pole v_. The monitoring circuit 14 includes a plurality of transistors Q1 QQ3, a plurality of resistors m~R5, and two capacitors C1 and c2. Two diodes D1 and D2 and a 12V power supply. The power pin vcc of the CPU fan 12 is connected to the 12V power supply of the monitoring circuit 14, the ground pin GND of the CPU fan 12 is grounded, and the rotor signal pin Tach〇 of the CPU fan 12 passes through the monitoring circuit μ. Connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the 12V power supply, the emitter of the transistor Qi is grounded through the resistor R2, and the emitter of the transistor Q1 is also transmitted through the capacitor C1. The anode of the diode D1 is connected, the cathode of the diode is respectively connected to the anode of the capacitor 〇 and the diode D1, the anode of the diode D2 is grounded, and the cathode of the diode D1 is transmitted through the resistor R3 and The base of the transistor Q2 is connected. The capacitor C2 is connected to the cathode of the diode D1 and the resistor 7 1309000 and the resistor R3. The other end of the capacitor C2 is grounded, and the emitter of the transistor Q2 is grounded. The collector of the transistor Q2 is connected to the 12V power supply through the resistor R5. The collector of the transistor Q2 is also connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is set. The pole is connected to the power supply negative V- of the alarm device 16, and the alarm device 16 is powered V + is connected to the positive 12V power supply through the resistor R4. The transistors Q1 to Q3 are all NPN type transistors, and the resistance of the resistor R2 is IKOhm, and the capacitance of the capacitor C1 is luF. • The CPU fan 12 starts to work after the computer is started, and its rotor signal pin Tacho outputs an alternate TTL level signal, which generates a pulse-type bias current after passing through the transistor Q1 of the monitoring circuit 14, thereby A pulse voltage is generated at both ends of R2, and the pulse voltage is sequentially converted into a smooth DC voltage by the capacitor C1 coupling, the diode D1 detection, and the capacitor C2 filtering, and the DC voltage turns on the transistor Q2, and the transistor Q3 is turned off. The alarm device 16 is turned off; when the CPU fan 12 stops rotating, the rotor signal pin Tacho outputs a constant voltage signal, so that the transistor Q1 of the monitoring circuit 14 generates a constant bias current, thereby at the resistor R2. A constant voltage is generated at both ends. At this time, there is no voltage output after the capacitor C1 and the diode D1. Therefore, the transistor Q2 is turned off, the transistor Q3 is turned on, and the alarm device 16 is activated to issue an alarm. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims. 1309000 « i j [Simple description of the drawing] II L II.1V diili Figure 1 is a circuit diagram of a preferred embodiment of the CPU fan stall warning circuit of the present invention. [Main component symbol description]
CPU風扇停轉報警電路 10 CPU風扇 12 監視電路 14 報警裝置 16 電源引腳 VCC 轉子訊號引腳 Tacho 接地引腳 GND 電源正極 V+ 電源負極 V- 電晶體 Q1 〜Q3 電阻 R1-R5 電容 C1、C2 二極體 Dl、D2 12V電源 12VCPU fan stall alarm circuit 10 CPU fan 12 monitoring circuit 14 alarm device 16 power pin VCC rotor signal pin Tacho ground pin GND power supply positive V+ power supply negative V- transistor Q1 ~ Q3 resistor R1-R5 capacitor C1, C2 Polar body Dl, D2 12V power supply 12V