201136081 六 [0001] [0002] [0003] [0004] 發明說明： 【發明所屬之技術領域】 本發明係關於一種電子設備，尤指一種具有高溫保護電 路的電子設備。 【先前技彳标】 家用電器如電冰箱、洗衣機等在長時間工作後會散發熱 量，導致其溫度逐漸升高，當熱量積累到一定程度後會 損壞家用電器，嚴重時還會引起火災，造成經濟損失。 【發明内容】 f、 鑒於以上内容，有必要提供一種具有高溫保護電路的電 子設備。 一種電子設備，包括一用於插接一電源插座接收直流電 壓的插頭、一與該插頭連接的高溫保護電路及一與該高 溫保護電路連接的供電電路•該南溫保護電路包括第·一 、第二電開關、一熱敏元件、一可變電阻器及一電阻， 該插頭的第一端透過該供電電路連接至該第一電開關的 第一端，該第一電開關的第二端連接至該插頭的第二端 U ，該第一電開關的控制端連接透過該電阻連接至該第二 電開關的第一端，該第二電開關的第一端及第二端分別 連接至該插頭的第一端及第二端，該熱敏元件與該可變 電阻器串聯在該第二電開關的第一與第二端之間，該第 二電開關的控制端連接至該可變電阻器與該熱敏元件之 間的節點，當熱敏元件感測到該電子設備的溫度低於一 預設溫度時，該節點電壓低於該第二電開關的導通電壓 使得該第二電開關截止，該第一電開關導通，該供電電 099110138 表單編號A0101 第4頁/共14頁 0992017879-0 201136081 路與該插頭連接來接收到電壓給該電子設備供電，當該 熱敏元件感測到該電子設備的溫度高於該預設溫度時， .該節點電壓南於該苐二電開關的導通電壓使得該第二電 開關導通，該第一電開關截止，斷開該供電電路與該插 . 頭之間的連接。 [0005] 一種電子設備，包括一用於插接一電源插座接收交流電 壓的插頭、一與該插頭連接的高溫保護電路及一與該高 溫保護電路連接的供電電路’該ifj溫保護電路包括第^ 一 0 、第二電開關、一熱敏元件、一可變電阻器、一電阻及 一整流器，該插頭的第一端透過該供電電路連接至該第 一電開關的第一端，該第一電開關的第二端連接至該插 頭的第二端，該第一電開關的控制端連接透過該電阻連 接至該第二電開關的第一端，該第二電開關的第一端及 第二端分別連接至該整流器的第一及第二輸出端，該整 流器的第一及第二輸入端連接至該插座的第一及第二端 ，該熱敏元件與該可變電阻器串聯在該整流器的第一與 〇 第二輸出端之間，該第二電開關的控制端連接至該可變 電阻器與該熱敏元件之間的節點，當熱敏元件感測到該 電子設備的溫度低於一預設溫度時，該節點電壓低於該 第二電開關的導通電壓使得該第二電開關截止，該第一 電開關導通，該供電電路與該插頭連接來接收到電壓給 該電子設備供電，當該熱敏元件感測到該電子設備的溫 度高於該預設溫度時，該節點電壓高於該第二電開關的 導通電壓使得該第二電開關導通，該第一電開關截止， 斷開該供電電路與該插頭之間的連接。 099110138 表單編號A0101 第5頁/共14頁 0992017879-0 201136081 [0006] [0007] 099110138 當該電子設備的溫度高於預設值，該保護電路透過該熱 敏元件感測到該電子設備的溫度而改變其阻值來使該熱 敏元件與該可變電阻器之間的節點電壓高於該第二電開 關的導通電壓，該第一電開關的控制端無法接收到觸發 電壓而截止來斷開該電子設備與該電壓源的連接，從而 實現了對該電子設備進行高温保護。 【實施方式】 請參考圖1，本發明電子設備1〇〇的第一較佳實施方式包 括一插頭10、一與該插頭10連接的高溫保護電路20及一 與該高溫保護電路2〇連接的供電電路3〇。該高溫保護電 路2 0包括一第一電開關如一雙向晶閘管s c R、一整流器d 、一可變電阻器RS、一熱敏元件如一熱敏電姐Rt、一第 一電開關如一電晶體Q及電阻R1—R3。琢插頭丨〇的第一端 a透過該供電電路30連接至該雙向晶閘管SCR的一第一主 電極端，該雙向晶閘管SCR的一第二主電極端連接至該插 頭10的第二端b。該整流器dM兩輸入端連接至該插頭的 第一及第一端a及b。該熱敏電阻Rt與該可變電阻器|^串 聯連接形成一分壓電路，該分壓電路的一端透過該電阻 R2連接到該整流器d的一輸出端。該分壓電路的另一端連 接到該整流器D的另一輸出端。該電晶體Q的基極連接至 該熱敏電阻Rt與該可變電阻器Rs之間的節點。該電晶體Q 的射極連接至該整流器D的一輸出端。該電晶體Q的集極 依次透過該兩電阻R1及R2連接至該整流器d的另一輸出端 ，並透過該電阻R3連接至該雙向晶閘管SCR的控制端來控 制該雙向晶閘管SCR的導通。當該雙向晶閘管SCR的控制 端接收到觸發電壓時，該雙向晶閘管SCR導通，當該雙向 0992017879-0[Technical Field] The present invention relates to an electronic device, and more particularly to an electronic device having a high temperature protection circuit. [Previous technical standards] Household appliances such as refrigerators, washing machines, etc. will dissipate heat after a long period of work, causing their temperature to gradually increase. When the heat is accumulated to a certain extent, it will damage the household appliances, causing fires in serious cases. Economic losses. SUMMARY OF THE INVENTION f. In view of the above, it is necessary to provide an electronic device having a high temperature protection circuit. An electronic device includes a plug for plugging a power socket to receive a DC voltage, a high temperature protection circuit connected to the plug, and a power supply circuit connected to the high temperature protection circuit. The south temperature protection circuit includes a first a second electrical switch, a thermal element, a variable resistor and a resistor, the first end of the plug being connected to the first end of the first electrical switch through the power supply circuit, the second end of the first electrical switch Connected to the second end U of the plug, the control end of the first electric switch is connected to the first end of the second electric switch through the resistor, and the first end and the second end of the second electric switch are respectively connected to a first end and a second end of the plug, the thermal element is connected in series with the variable resistor between the first and second ends of the second electric switch, and the control end of the second electric switch is connected to the a node between the variable resistor and the temperature sensitive element, when the temperature sensor senses that the temperature of the electronic device is lower than a preset temperature, the node voltage is lower than a turn-on voltage of the second electrical switch such that the second The electric switch is turned off, the first electric Off, the power supply 099110138 Form No. A0101 Page 4 / Total 14 Page 0992017879-0 201136081 The road is connected to the plug to receive voltage to supply power to the electronic device, when the thermal element senses the temperature of the electronic device is high At the preset temperature, the node voltage is souther than the turn-on voltage of the second electrical switch such that the second electrical switch is turned on, the first electrical switch is turned off, and the connection between the power supply circuit and the plug is disconnected. . [0005] An electronic device includes a plug for plugging a power socket to receive an AC voltage, a high temperature protection circuit connected to the plug, and a power supply circuit connected to the high temperature protection circuit. The ifj temperature protection circuit includes a 0, a second electrical switch, a thermal element, a variable resistor, a resistor and a rectifier, the first end of the plug being connected to the first end of the first electrical switch through the power supply circuit, the first a second end of the first switch is connected to the second end of the plug, and the control end of the first switch is connected to the first end of the second switch through the resistor, the first end of the second switch The second ends are respectively connected to the first and second output ends of the rectifier, the first and second input ends of the rectifier are connected to the first and second ends of the socket, and the thermal element is connected in series with the variable resistor Between the first and second output ends of the rectifier, a control end of the second electrical switch is coupled to a node between the variable resistor and the thermal element, and the thermal element senses the electronic device Temperature is lower than a preset At a temperature, the node voltage is lower than the conduction voltage of the second electrical switch such that the second electrical switch is turned off, the first electrical switch is turned on, and the power supply circuit is connected to the plug to receive a voltage to supply power to the electronic device. When the temperature sensor senses that the temperature of the electronic device is higher than the preset temperature, the node voltage is higher than the conduction voltage of the second electrical switch, so that the second electrical switch is turned on, the first electrical switch is turned off, and the first electrical switch is turned off. The connection between the power supply circuit and the plug. 099110138 Form No. A0101 Page 5 of 14 0992017879-0 201136081 [0006] [0007] 099110138 When the temperature of the electronic device is higher than a preset value, the protection circuit senses the temperature of the electronic device through the thermal element And changing the resistance value such that the node voltage between the temperature sensitive element and the variable resistor is higher than the conduction voltage of the second electrical switch, and the control end of the first electrical switch cannot receive the trigger voltage and is cut off The connection of the electronic device to the voltage source is opened, thereby achieving high temperature protection of the electronic device. [First Embodiment] Referring to FIG. 1 , a first preferred embodiment of an electronic device 1 of the present invention includes a plug 10 , a high temperature protection circuit 20 connected to the plug 10 , and a high temperature protection circuit 2 . The power supply circuit is 3〇. The high temperature protection circuit 20 includes a first electrical switch such as a bidirectional thyristor sc R, a rectifier d, a variable resistor RS, a thermal element such as a thermal ampere Rt, a first electrical switch such as a transistor Q, and Resistors R1 - R3. The first end a of the plug 丨〇 is connected to a first main electrode end of the triac SCR through the power supply circuit 30, and a second main electrode end of the triac SCR is connected to the second end b of the plug 10. The two inputs of the rectifier dM are connected to the first and first ends a and b of the plug. The thermistor Rt and the variable resistor are connected in series to form a voltage dividing circuit, and one end of the voltage dividing circuit is connected to an output end of the rectifier d through the resistor R2. The other end of the voltage dividing circuit is connected to the other output of the rectifier D. The base of the transistor Q is connected to a node between the thermistor Rt and the variable resistor Rs. The emitter of the transistor Q is coupled to an output of the rectifier D. The collector of the transistor Q is sequentially connected to the other output terminal of the rectifier d through the two resistors R1 and R2, and is connected to the control terminal of the triac SCR through the resistor R3 to control the conduction of the triac SCR. When the control terminal of the triac SCR receives the trigger voltage, the triac SCR is turned on when the bidirectional 0992017879-0
表單編號A0101 第6頁/共14 I 201136081 晶閘管SCR的控制端未接收到觸發電壓時，雙向晶閘管 SCR截止。 [0008] Ο 在本實施方式中，該插頭10用於插接一電源插座（未示 出）來接收一外部交流電壓給該供電電路30。該供電電 路30用於對該電子設備100的其他元件（未示出）供電。 該高溫保護電路20用於對該電子設備1 00進行高溫保護， 即當該電子設備100的溫度達到一預設溫度如40度時，透 過斷開該供電電路30與該插頭10之間的連接來停止提供 電壓給該供電電路30，從而對該電子設備100進行高溫保 護。根據溫度為該預設溫度40度時該熱敏電阻Rt的阻值 來對該可變電阻器Rs的阻值進行調節以使得該電子設備 10 0的溫度達到40度後該可變電阻器Rs與該熱敏電阻Rt 之間的節點電壓大於該電晶體Q的導通電壓。進行高溫保 護的具體工作過程如下： [0009] 〇 當該電子設備100的電源插頭10插入該電源插座後，該插 頭10接收來該電源插座提供的電壓，此時該電子設備100 的溫度低於40度，該熱敏電阻Rt與該可變電阻器Rs之間 的印點電壓（該電晶體Q的基極電壓）小於該電晶體Q的 導通電壓，該電晶體Q截止。該雙向晶閘管SCR導通。該 電子設備100進入工作狀態。當該電子設備100的溫度達 到40度時，該熱敏電阻Rt與該可變電阻器Rs之間的節點 電壓大於該電晶體Q的導通電壓，該電晶體Q導通，該雙 向晶閘管SCR截止。該電子設備100停止工作。 請參考圖2，本發明電子設備100的第二較佳實施方式相 較於第一較佳實施的區別在於：第二較佳實施方式中的 099110138 表單編號A0101 第7頁/共14頁 0992017879-0 [0010] 201136081 *亥熱敏電阻Rt連接在該電晶體Q的基極與其射極之間，該 可變電阻器rs連接在該電晶體Q的基極與該兩電阻Ri、R2 的節點之間。在第一較佳實施方式中，該熱敏電阻Μ的 :值(W,皿度的升南而降低，隨溫度的降低而升高。在第 實把方式中’ δ亥熱敏電阻^的阻值隨溫度的升高 而升高’隨溫度的降低該本發明電子設備刚的 第二較佳實施方式的工作⑼與第-較佳實施方式的工 作原理相同，在此不再贅迷 [0011] [0012] [0013] [0014] [0015] 在其他實施方式中’錢電壓源提供的電壓為直流電壓 時’該整流器D可以刪除，讀兩電阻ri^產生限流作用 ’可以刪除。 該電子設備1GG透過其高遂保護電路職敏電阻Rt感測到 該電子設備⑽的溫度而改變阻值使得當該電子設備1〇〇 的溫度高於贱值後控制姨雙向晶閘管⑽截止來該供電 電路30與該插頭10連接，從而對該電子設備⑽進行高溫 保護。 综上所述’本發明符合發明專利要件，爰依法提出專利 申凊。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’在美依本發明精神所作之等效修 飾或變化’皆應涵蓋於以下之中請專利範圍内。 【圖式簡單說明】 圖1係本發明電子設備的第1佳實施方式的電路圖。 圖2係本發明電子設備的第二較佳實施方式的電路圖。 【主要元件符號說明】 099110138 表單蝙號A0101 第8頁/共 0992017879-0 U頁 201136081 [0016] [0017] [0018] [0019] [0020] [0021] [0022] Ο [0023] . [0024] [0025] ❹ 插頭：1 0 rfj溫保護電路.2 0 供電電路：30 電子設備：100 雙向晶閘管：SCR 整流器：D 電晶體：Q 熱敏電阻：Rt 可變電阻器：Rs 電阻：R1-R3 099110138 表單編號A0101 第9頁/共14頁 0992017879-0Form No. A0101 Page 6 of 14 I 201136081 When the control terminal of the thyristor SCR does not receive the trigger voltage, the triac SCR is turned off. [0008] In the present embodiment, the plug 10 is used to plug a power outlet (not shown) to receive an external AC voltage to the power supply circuit 30. The power supply circuit 30 is used to power other components (not shown) of the electronic device 100. The high temperature protection circuit 20 is configured to perform high temperature protection on the electronic device 100, that is, when the temperature of the electronic device 100 reaches a preset temperature, such as 40 degrees, the connection between the power supply circuit 30 and the plug 10 is disconnected. The supply of voltage to the power supply circuit 30 is stopped to protect the electronic device 100 from high temperature. The resistance of the variable resistor Rs is adjusted according to the resistance of the thermistor Rt when the temperature is 40 degrees of the preset temperature, so that the temperature of the electronic device 10 reaches 40 degrees, and the variable resistor Rs The node voltage with the thermistor Rt is greater than the turn-on voltage of the transistor Q. The specific working process for performing high temperature protection is as follows: [0009] When the power plug 10 of the electronic device 100 is inserted into the power socket, the plug 10 receives the voltage supplied by the power socket, and the temperature of the electronic device 100 is lower than the temperature. At 40 degrees, the dot voltage between the thermistor Rt and the variable resistor Rs (the base voltage of the transistor Q) is smaller than the turn-on voltage of the transistor Q, and the transistor Q is turned off. The triac SCR is turned on. The electronic device 100 enters an operational state. When the temperature of the electronic device 100 reaches 40 degrees, the node voltage between the thermistor Rt and the variable resistor Rs is greater than the turn-on voltage of the transistor Q, the transistor Q is turned on, and the two-way thyristor SCR is turned off. The electronic device 100 stops working. Referring to FIG. 2, a second preferred embodiment of the electronic device 100 of the present invention differs from the first preferred embodiment in that: 099110138 in the second preferred embodiment, form number A0101, page 7 / total 14 pages, 0992017879- [0010] 201136081 * The holographic thermistor Rt is connected between the base of the transistor Q and its emitter, and the variable resistor rs is connected to the base of the transistor Q and the nodes of the two resistors Ri, R2 between. In the first preferred embodiment, the value of the thermistor Μ (W, the rise of the degree of the dish decreases, and increases with the decrease of the temperature. In the actual mode, the δH Thermistor ^ The resistance increases with an increase in temperature'. With the decrease in temperature, the operation (9) of the second preferred embodiment of the electronic device of the present invention works in the same manner as the first preferred embodiment, and is no longer fascinating [ [0015] [0015] [0015] In other embodiments, when the voltage supplied by the money voltage source is a DC voltage, the rectifier D can be deleted, and the reading of the two resistors ri^ to generate a current limiting action can be deleted. The electronic device 1GG senses the temperature of the electronic device (10) through its sorghum protection circuit dynamometer Rt to change the resistance value so that when the temperature of the electronic device 1 贱 is higher than the threshold value, the control 姨 triac (10) is turned off. The power supply circuit 30 is connected to the plug 10 to protect the electronic device (10) from high temperature. In summary, the invention conforms to the invention patent requirement, and the patent application is filed according to law. However, the above is only the comparison of the present invention. Good example, familiar with the case The skilled person's 'equivalent modification or variation in the spirit of the present invention' should be included in the following patents. [Simplified Schematic] FIG. 1 is a first preferred embodiment of the electronic device of the present invention. Figure 2 is a circuit diagram of a second preferred embodiment of the electronic device of the present invention. [Main component symbol description] 099110138 Form bat number A0101 Page 8 / Total 0992017879-0 U page 201136081 [0016] [0018] [0020] [0020] [0023] [0024] [0025] 插头 Plug: 1 0 rfj temperature protection circuit. 2 0 Power supply circuit: 30 Electronic equipment: 100 Bidirectional thyristor: SCR Rectifier: D Transistor: Q Thermistor: Rt Variable Resistor: Rs Resistor: R1-R3 099110138 Form No. A0101 Page 9 of 14 Page 0992017879-0