201135155 六、發明說明： 【發明所屬之技術領域】 本發明有關於一種加熱裝置，尤指一種可顯示爐面上 的餘溫的加熱裝置。 【先前技術】 常見的電熱式加熱烹調爐為電磁爐，其主要是利用不 同頻率之交流電源產生交變磁場，而後因磁力線的切割於 、.尚了上產生感應電流，所產生的感應電流會因鋼具内部的 電磁損耗而轉換為熱能，來達到感應加熱的目的。/、 ° ；電熱式加熱烹調爐相較於傳統的瓦斯爐，具有升溫速 f t:溫度分布均勻、控溫精準、高安全性及無排放-5 化碳等特點。 白知電磁加熱裝置如第—圖所示，電磁加熱裝置 了本體U、—加熱單幻3、—操作單元Μ及一顯示單 其中本體Π的一側面具有一爐面111，加熱單元13 =在本體11内並與爐面U1的位置相對應，電磁加熱裝 以拙艮據‘作單7° 15所接收的操作指令來控制加熱單元^ 執仃加熱或定溫等模式，使得置放在爐面⑴的鋼具(圖 不）可加熱鍋具内的被烹調物。 加執習知電磁加熱裝置1的顯示單元〗7通常僅顯示 電磁力^度’纽用者絲具賴面111上移開或關閉 此，使度，因此不具有溫度警示功能。因 易因于加熱後的爐面⑴所殘留的溫度，容 ，‘、、0寺疏忽去碰觸到爐面ill❿造成烫傷。 3/15 201135155 【發明内容】 有鑑於上述問題，本發明所欲解決的技術問題，在於 提供一種可顯示與爐面的溫度有關的提示訊號，以解決習 知加熱装置停止加熱後未提示使用者注意爐面上的餘溫， 達到警示及安全的效果。 本發明之目的在於提供一種加熱裝置，提供使用者加 熱被烹调物外，還提醒使用者加熱過後的爐面所殘留的餘 溫過熱。 為了解決上述技術問題，本發明之一技術方案係提供 種加熱裝置，包括一本體、一加熱單元、一溫度檢測單 元、一顯示單元及一微控制單元。其中加熱單元、溫度檢 測單元及微控制單元設置在本體裡，本體具有一爐面，顯 示草元設置在本體上。加熱單元用以加熱放置在爐面上的 鋼具；溫度檢測單元檢測爐面的溫度，並根據檢測結果輸 出一溫度訊號；微控制單元根據溫度訊號判斷爐面的溫度 是否大於一預設溫度，以控制顯示單元顯示一提示訊號。 為了解決上述技術問題，本發明之另一技術方案係提 i、種加熱裝置的餘溫顯示方法，包括啟動一加熱單元； 判斷一爐面是否有置鍋；若爐面沒有置鍋，則關閉加熱單 元並啟動一溫度檢測單元；判斷爐面的溫度是否超過一預 設溫度；若爐面的溫度超過預設溫度，則調整位於爐面上 的一顯示單元顯示與溫度相對應的一提示訊號。 藉由前述的技術方案，本發明可因應不同的餘溫顯示 不同的提示訊號’提供使用者參考爐面所殘留的溫度，以 提升使用的安全性。 以上的概述與接下來的詳細說明皆為示範性質，是為 4/15 201135155 了進一步說明本發明的申請專利範圍。而有關本發明的其 他目的與優點，將藉由以下的說明及所附圖式得到進〜^ 的瞭解。然而，所附圖式僅提供參考與說明，並非用二 ‘ 本發明加以限制。 + 【實施方式】 — >請參考第二圖，為本發明所提供的一種加熱裝置之— 實施例之示意圖。如第二圖所示，加熱裝置2包括—本體 • 2卜本體21的一頂板210具有一個爐面211。加熱裝置2 更包括加熱單元23、溫度檢測單元24、操作單元乃、第— ”、、員示單元27、及苐一顯示單元29，其中加熱單元23、溫产 2測單元24設置在本體21内；第一顯示單元27設置：： 體21上；第二顯示單元29言史置在爐面211的周圍或鄰近 位置。實際實施時，加熱裝置2可具有兩組相同的上述元 件，其分別獨立運作。 其中加熱單元23用來加熱放置在爐面211上的鍋具（ # 曰未示）加熱單元23可為感應線圈，藉由接收一交變電流 生—磁場，使爐面211上的鋼具產生—感應電場，加 ‘、、、單元23亦可為加熱電阻等其他加熱源。加熱單元μ可 為％形或方形線圈，加熱單元23的形狀與爐面211的形狀 相對應。 机 仰_孤度檢測單元24用來檢測爐面211的溫度；溫度檢測 ' 單元 了為電阻溫度檢測器(RTD)或紅外線溫度檢測器等 三溫度檢測單元24可設置在爐面211財心下方，檢測的 範圍、大、:勺與爐面211的範圍相同，通常加熱後爐面211的 中％最燙，距離中心越遠，爐面211的溫度越低，因此溫 5/15 201135155 ^單元24設置在爐面211中心所檢測的效果較佳。 爐面顯不單元29設置在爐面211的周圍，用來顯示與 阶極技志的溫度有關的提示訊號；第二顯示單元29可為冷 “二’且第二顯示單元29的形狀及大小可 的部八、旱24的形狀及大小，即配合爐面211上可加熱 會發.、如環幵》或方形，用來提示使用者爐面211上可能 一燙的區域。舉例來說，第二顯示單元29的外觀可如第 圖所不，具有多個發光區291、295及多個遮光區293、 297、菩货一 - 〇 石乐二顯示單元29為LED燈管，則第二顯示單元29 可匕括一個或一個以上的LED發光元件’其中LED發光元 件可叹置在發光區291、295、的其中一區内，利用LED發 光元件側向發光使第二顯示單元29内不同位置的發光區 291 295發出均勻的光，且第二顯示單元29所發的光為閃 爍光，例如每一秒閃爍一次，每一次發光持續時間為〇.5秒 ，且發光的亮度隨爐面211的溫度改變，通常若溫度越高 ，則亮度越強，反之若溫度越低，亮度越弱。如表一所示 。其中亮度比例為相較於第二顯示單元29最大亮度的比例 爐面溫度 T(°〇 T<42 42 ST <45 45 ST <48 48^T<50 Τ>50 亮度比例 0 1/5 2/5 3/5 4/5 表一 操作單元25分別提供使用者操作設定加熱單元23的 加熱溫度，更可以用來提供使用者設定加熱的時間，使加 6/15 201135155 熱裝置2操作在加熱、定溫或㈣加熱的模式。 973 :錄兀27可包括七段顯示器271及燈號指示器 其巾—種或是兩種的組合。七段顯示器 二:顯:加熱裝置2目前加熱的鋼喷 二:Γ:顯示加熱裝置2操作的模式，如定時、加熱 = ί:,號指示器273更可以在加熱裝置2内部元件 熱或發生電流過_發出警示的燈號。 加^置2更可包括一揚聲單元(圖未示），當加熱裝置 2發生電流過載、溫度過埶時發出 設定溫度或關閉加熱裝置2 Λ出警不音’提醒使用者調整 ^裝置2 有過熱保護功能’也就是在溫度過孰 時啟動散熱機制。 … 為了進-步說明加熱裝置2内部所 動請參考第三圖，為本發明所提供f種餘㈣ π控制電路之-實施例之方塊圖。如第三圖所示 示=路2二包括微控制單元2〇、電源電㈣ ^軍^ 測單元23卜第二溫度檢測單元24,、 _娜解元26、第—絲單元27、散熱單 9。餘溫顯示控制電路2a適用於具 有加熱功能的加熱裝置2,其中路 22、加熱單元23、第一加泠扒、电你電路 單元24,度檢測早元231、第二溫度檢測 的本體== = :元28設置在加熱裝 ==第第二溫度檢測單元Μ、操作單元心 ，偵d早7L 26、第—顯示單元27、散 示單元29分別與微控制單元2G祕；第—溫度 7/15 201135155 231還與加熱單元 溫顯示控制電路2a。 (圖未示）。 粞接’加熱裝置2可包括至少一組餘 加熱單元23可具有一 [GBT功率開關 電源電路22與201135155 VI. Description of the Invention: TECHNICAL FIELD The present invention relates to a heating device, and more particularly to a heating device that can display the residual temperature on the surface of the furnace. [Prior Art] A common electric heating cooking oven is an induction cooker, which mainly uses an alternating current power source of different frequencies to generate an alternating magnetic field, and then an induced current is generated due to the cutting of the magnetic lines of force, and the induced current is generated. The electromagnetic loss inside the steel is converted into heat energy to achieve the purpose of induction heating. /, °; Compared with the traditional gas furnace, the electric heating cooking furnace has the heating rate f t: uniform temperature distribution, precise temperature control, high safety and no emission - carbonization. As shown in the first figure, the electromagnetic heating device has a body U, a heating single illusion 3, an operating unit Μ and a display unit, wherein a side of the body 具有 has a furnace surface 111, and the heating unit 13 = The body 11 corresponds to the position of the furnace surface U1, and the electromagnetic heating device controls the heating unit to perform the heating or constant temperature mode according to the operation command received by the single unit 7° 15 so as to be placed in the furnace. The steel piece of the surface (1) (not shown) can heat the food to be cooked in the pot. It is added that the display unit 7 of the electromagnetic heating device 1 generally only displays the electromagnetic force, and the newer wire has been removed or closed on the screen 111, so that it does not have a temperature warning function. Because of the temperature remaining in the furnace surface (1) after heating, the ‘, 0 temple is negligent to touch the furnace surface ill❿ causing burns. 3/15 201135155 SUMMARY OF THE INVENTION In view of the above problems, the technical problem to be solved by the present invention is to provide a prompt signal capable of displaying the temperature of the furnace surface to solve the problem that the conventional heating device does not prompt the user after stopping heating. Pay attention to the residual temperature on the furnace surface to achieve warning and safety effects. SUMMARY OF THE INVENTION An object of the present invention is to provide a heating device which provides a user with heating outside the cooking object and also reminds the user of the residual temperature remaining in the furnace surface after heating. In order to solve the above technical problem, a technical solution of the present invention provides a heating device including a body, a heating unit, a temperature detecting unit, a display unit and a micro control unit. The heating unit, the temperature detecting unit and the micro control unit are disposed in the body, and the body has a furnace surface, and the grass element is disposed on the body. The heating unit is configured to heat the steel piece placed on the furnace surface; the temperature detecting unit detects the temperature of the furnace surface, and outputs a temperature signal according to the detection result; the micro control unit determines whether the temperature of the furnace surface is greater than a preset temperature according to the temperature signal, A prompt signal is displayed by the control display unit. In order to solve the above technical problem, another technical solution of the present invention provides a method for displaying a residual temperature of a heating device, comprising: starting a heating unit; determining whether a furnace surface has a pot; if the furnace surface is not provided, closing Heating the unit and starting a temperature detecting unit; determining whether the temperature of the furnace surface exceeds a preset temperature; if the temperature of the furnace surface exceeds the preset temperature, adjusting a display unit located on the furnace surface to display a prompt signal corresponding to the temperature . According to the foregoing technical solution, the present invention can display different prompt signals according to different residual temperatures to provide the user with reference to the temperature remaining in the furnace surface to improve the safety of use. The above summary and the following detailed description are exemplary and are intended to further illustrate the scope of the claims of the present invention. Other objects and advantages of the present invention will become apparent from the following description and the appended claims. However, the drawings are only provided for reference and description, and are not intended to limit the invention. + [Embodiment] - > Please refer to the second figure, which is a schematic view of an embodiment of a heating device provided by the present invention. As shown in the second figure, the heating device 2 includes a top plate 210 of the main body 21 having a furnace surface 211. The heating device 2 further includes a heating unit 23, a temperature detecting unit 24, an operating unit, a first, a member unit 27, and a first display unit 29, wherein the heating unit 23 and the temperature generating unit 24 are disposed on the body 21. The first display unit 27 is disposed on the body 21; the second display unit 29 is placed around or adjacent to the furnace surface 211. In actual implementation, the heating device 2 may have two sets of the same components described above, respectively. The heating unit 23 is configured to heat the pot placed on the furnace surface 211 (# 曰 not shown). The heating unit 23 can be an induction coil, and the alternating current-magnetic field is received on the furnace surface 211. The steel tool generates an induced electric field, and the addition, ', and unit 23 may be other heating sources such as a heating resistor. The heating unit μ may be a % or square coil, and the shape of the heating unit 23 corresponds to the shape of the furnace surface 211. The elevation_degree detection unit 24 is used to detect the temperature of the furnace surface 211; the temperature detection unit is a three-temperature detection unit 24 such as a resistance temperature detector (RTD) or an infrared temperature detector, which can be disposed below the furnace surface 211, Detection The range, large, and scoop are the same as the range of the furnace surface 211. Generally, the middle of the furnace surface 211 is the hottest after heating, and the farther from the center, the lower the temperature of the furnace surface 211, so the temperature is 5/15 201135155 ^ unit 24 setting The effect detected at the center of the furnace surface 211 is better. The furnace surface display unit 29 is disposed around the furnace surface 211 for displaying a warning signal related to the temperature of the step technique; the second display unit 29 may be cold. The shape and size of the second display unit 29 and the shape and size of the drought 24, that is, the heating surface of the furnace surface 211 can be heated, such as a ring or a square, to prompt the user to the furnace surface. A hot area on 211. For example, the appearance of the second display unit 29 can be as shown in the figure, and has a plurality of light-emitting areas 291, 295 and a plurality of light-shielding areas 293, 297, and a display device 29 is an LED tube. The second display unit 29 can include one or more LED light-emitting elements, wherein the LED light-emitting elements can be slanted in one of the light-emitting areas 291, 295, and the second display is performed by the LED light-emitting elements. The illuminating area 291 295 at different positions in the unit 29 emits uniform light, and the light emitted by the second display unit 29 is scintillating light, for example, blinking once every second, each illuminating duration is 〇.5 seconds, and the illuminating The brightness changes with the temperature of the furnace surface 211. Generally, if the temperature is higher, the brightness is stronger, whereas if the temperature is lower, the brightness is weaker. As shown in Table 1. Wherein the brightness ratio is the ratio of the maximum surface brightness of the second display unit 29 to the furnace surface temperature T (°〇T<42 42 ST <45 45 ST <48 48^T<50 Τ>50 brightness ratio 0 1/5 2/5 3/5 4/5 Table 1 operating unit 25 respectively provides the user to operate the setting heating unit 23 heating temperature, and can also be used to provide the user to set the heating time, so that the 6/15 201135155 thermal device 2 is operated at Heating, constant temperature or (4) heating mode 973: Recording 27 can include a seven-segment display 271 and a light indicator, a towel, or a combination of the two. Seven-segment display two: display: heating device 2 is currently heated Steel spray two: Γ: shows the mode of operation of the heating device 2, such as timing, heating = ί:, the number indicator 273 can be used in the heating device 2 internal component heat or current generation _ warning signal. It can further include a speaker unit (not shown). When the heating device 2 is overloaded, the temperature is too high, the set temperature is turned off or the heating device is turned off. 2 The alarm is not sounded. [Remind the user to adjust the device 2 has overheat protection function. That is to start the heat dissipation mechanism when the temperature is too high. Step-by-step description of the inside of the heating device 2, please refer to the third figure, which is a block diagram of an embodiment of the invention. The second embodiment shows that the circuit 2 includes micro-control. The unit 2〇, the power supply (4), the military measurement unit 23, the second temperature detection unit 24, the _Na solution 26, the first wire unit 27, the heat dissipation unit 9. The residual temperature display control circuit 2a is suitable for heating function The heating device 2, wherein the road 22, the heating unit 23, the first twisting, the electric circuit unit 24, the degree detecting early element 231, the second temperature detecting body ===: the element 28 is set in the heating device == first The second temperature detecting unit Μ, the operating unit core, the detecting d 7L 26, the first display unit 27, the dispersing unit 29 and the micro control unit 2G respectively; the first temperature 7/15 201135155 231 and the heating unit temperature display control circuit 2a. (not shown) The splicing 'heating device 2 may include at least one set of residual heating units 23 may have a [GBT power switching power supply circuit 22 and
單元25接收使用者輸人的指令訊號Cl，指令訊號 1匕疋時、加熱或定溫等，微控制單元2〇根據指令訊號The unit 25 receives the command signal C1 input by the user, and when the command signal is 1 、, heating or constant temperature, etc., the micro control unit 2 〇 according to the command signal
231用來檢測加熱單元23中】:啦功率開關的操作溫度， 並輸出第一溫度訊號Tl至微控制單元2〇，微控制單 微控制單元20 根，第-溫度城1^娜加熱單元23的輸出功率或開啟散 熱單元28，以保護加熱單元23或其他元件不被燒毀。 舉例來說’加熱單元23的變化磁場使鋼具產生感應電 場，鍋具偵測單元26偵測鍋具的電子流動所產生的感應電 動勢以輸出一偵測訊號D,，微控制單元2〇根據偵測訊號 來判斷爐面2Π是否有置鍋，當微控制單元2〇判斷爐面 211上的銷具從有到無時’則微控制單元2〇啟動第二溫度 檢測單元24’ ；第二溫度檢測單元24’偵測爐面211的溫度 ’並根據檢測結果輸出一第二溫度訊號T2，微控制單元20 根據第二溫度訊號丁2判斷爐面211的溫度是否大於一預設 溫度，此預設溫度可内建於微控制單元20。預設溫度可為 8/15 201135155 -組預設溫度，微控制單元2G將第二溫度訊號了2與預設溫 度比較以判斷爐面211的溫度大小，並根據第二溫度訊號 丁2的大小控制第二顯示單元29顯示提示訊號，如每秒鐘閃 蝶-次的燈光’骑光的強度與第二溫度訊號1的大小相 對應。 溫顯======加嶋之餘 員他⑺I々丨L%圖。如第四圖所示，首 微=單元2〇接收來自操作單元25的指令訊號⑽物） 元2〇们ϋ可為疋時、加熱或定溫指令訊號，微控制單 ^ Q將加熱裝置2操作在不_模式，同 n时所選擇的操作模式控制m轉以7奸 :斷會先判斷爐面211是否有置鋼陶， 後於中㈣可根據鋼具偵測單^26偵測鋼具的感應電動勢 l_Dl來判斷是否有置鍋，實際實施時，若 5 "，a〇 6〇 ^^制a2G啟動第二顯示單元2耶鄕），此時第 。70 9可為全免。預設相可内縣微控解元20内 單元===：^°^23_'第二顯示 制器2。亦可同=:;::顯正在，2’微控 元2〇將偵測到銷具，則微控制單 。 、*作在待機模式，即不啟動加熱單元23 虽加熱裳置2操作在加熱模式時，微控制單元20仍會 9/15 201135155 定時判斷爐面211是否有置鋼(s彻）；當爐面211持續有置 鋼’則微㈣料2〇崎衫接收到停止加減號，也就 疋從操作單7〇 25 m到停止加熱訊號(S4⑴；綠控制單 元20接收到停止加熱訊號或是判斷爐面211未置鍋的時間 超過預設時間，則關閉加熱單元23並啟動第二溫度檢測單 兀24’(S413)，第二溫度檢測單元24’根據爐面21丨的溫度輸 出第二溫度訊號h ;微控制單元2〇根據第二溫度訊號丁2 判斷爐面2Γ1的溫度是否超過第一預設溫度(S415);微控制 單元20根據爐面2〗1的溫度調整第二顯示單元29顯示相 對應的提示訊號(S417);第二顯示單元29顯示提示訊號後 ，微控制單元20在一特定時間内會再次判斷爐面211的溫 度是否有冷卻下降，直到第二溫度訊號丁2低於第一預設溫 度後’微控制單元20才關閉第二顯示單元29。 其中判斷爐面211的溫度過程可將第二溫度訊號丁2與 一組預設溫度比較，舉例來說，若第二溫度訊號τ2低於第 一預設溫度時，則關閉第二顯示單元29(S419);若第二溫 度訊號丁2高於第一預設溫度，例如42度時。則繼續將第二 溫度訊號T2與第二預設溫度比較(S415)，如50度，若第二 溫度訊號丁2高於第二預設溫度，則控制第二顯示單元29 的亮度相較於全亮時的4/5(S417) ;若第二溫度訊號Τ2低於 第二預設溫度，則繼續將第二溫度訊號Τ2與第三預設溫度 比較(S415)，例如48度，若高於第三溫度預設溫度，則控 制第二顯示單元29的亮度相較於全亮的3/5(S417);若低於 第三預設溫度則以此類推，將第二溫度訊號T2與第四預設 溫度比較(S415)，第四預設溫度小於第三預設溫度，可參考 表一，直到比較出第二溫度訊號Τ2小於第一預設溫度，才 10/15 201135155 停止比較並闕閉第二顯示單元29(S419)。 絲合上述可知，本發明之加熱裝置利用溫度檢測單元 • 檢測爐面的溫度，並根據爐面的溫度在爐面相鄰的地方顯 示閃爍燈光，且燈光隨爐面的溫度高低具有相對應的亮度 比例。藉此，使用者可清楚判斷爐面是否有餘溫，預防使 用者誤觸具有餘溫的爐面而造成燙傷。 惟以上所述者’僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 • 範圍及發明說明内容所作之簡單的等效變化與修飾 ，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖為習知電磁加熱裝置之—實施例之示意圖； =圖為本發明之加熱裝置之—實施例之示意圖； 塊圖.^圖為本發明之餘溫顯示控制電路之一實施例之方 #狀為本發明之加熱裝置之餘溫顯示方法之-實施 【主要元件符號說明】 1電磁加熱裳置 . u本體 hi爐面 加熱單元 15操作單元 17顯示單元 11/15 201135155 2加熱裝置 2a餘溫顯示控制電路 21本體 210頂板 211爐面 20微控制單元 22電源電路 23加熱單元 24溫度檢測單元 25操作單元 26鍋具偵測單元 27第一顯示單元 271七段顯示器 273燈號指示器 28散熱單元 29第二顯示單元 291、295發光區 293、297遮光區 231第一溫度檢測單元 24’第二溫度檢測單元 乃第一溫度訊號 T2第二溫度訊號 C1指令訊號 D,偵測訊號 S401〜S419加熱裝置之餘溫顯示方法之步驟 12/15231 is used to detect the operating temperature of the power switch in the heating unit 23, and output the first temperature signal T1 to the micro control unit 2〇, the micro control unit micro control unit 20, the first temperature temperature unit 1 heating unit 23 The output power or the heat sink unit 28 is turned on to protect the heating unit 23 or other components from being burnt. For example, the changing magnetic field of the heating unit 23 causes the steel to generate an induced electric field, and the pan detecting unit 26 detects the induced electromotive force generated by the electron flow of the pan to output a detecting signal D, and the micro control unit 2 Detecting the signal to determine whether there is a pot on the furnace surface 2, and when the micro control unit 2 determines that the pin on the furnace surface 211 is from no time to no time, the micro control unit 2 starts the second temperature detecting unit 24'; The temperature detecting unit 24' detects the temperature of the furnace surface 211 and outputs a second temperature signal T2 according to the detection result. The micro control unit 20 determines whether the temperature of the furnace surface 211 is greater than a preset temperature according to the second temperature signal D2. The preset temperature can be built into the micro control unit 20. The preset temperature can be 8/15 201135155 - the preset temperature of the group, and the micro control unit 2G compares the second temperature signal 2 with the preset temperature to determine the temperature of the furnace surface 211, and according to the size of the second temperature signal D 2 The second display unit 29 is controlled to display a prompt signal, such as a flash of light per second - the intensity of the ride light corresponds to the size of the second temperature signal 1. Wen Xian ====== After the addition of the staff member (7) I々丨L% map. As shown in the fourth figure, the first micro = unit 2 〇 receives the command signal (10) from the operating unit 25) 2 can be the time, heating or constant temperature command signal, the micro control unit Q will heat the device 2 Operation is not in _ mode, the same operation mode control when n is the same as n: 7 will judge whether the furnace surface 211 has a steel pottery, and then in the middle (four) can detect the steel according to the steel detection unit With the induced electromotive force l_Dl to determine whether there is a pot, in actual implementation, if 5 ", a 〇 6 〇 ^ ^ system a2G start the second display unit 2 yeah), at this time. 70 9 is free. The preset phase can be counted within the county's micro-control solution. Unit ===:^°^23_'Second display controller 2. It can also be the same as =:;::: 2' micro-control unit 2〇 will detect the pin, then the micro-control list. , * in the standby mode, that is, does not start the heating unit 23, although the heating skirt 2 operation in the heating mode, the micro control unit 20 will still 9 / 15 201135155 timing to determine whether the furnace surface 211 has steel (s); Face 211 continues to have steel. 'Micro (four) material 2 〇 衫 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作 操作When the furnace surface 211 is not set for more than the preset time, the heating unit 23 is turned off and the second temperature detecting unit 24' is activated (S413), and the second temperature detecting unit 24' outputs the second temperature according to the temperature of the furnace surface 21A. The signal h is determined by the micro control unit 2 〇 according to the second temperature signal D 2 to determine whether the temperature of the furnace surface 2Γ1 exceeds the first preset temperature (S415); the micro control unit 20 adjusts the second display unit 29 according to the temperature of the furnace surface 2 The corresponding prompt signal is displayed (S417); after the second display unit 29 displays the prompt signal, the micro control unit 20 determines again whether the temperature of the furnace surface 211 has a cooling drop for a certain period of time until the second temperature signal is low. After the first preset temperature' The micro control unit 20 turns off the second display unit 29. The process of determining the temperature of the furnace surface 211 can compare the second temperature signal D2 with a set of preset temperatures, for example, if the second temperature signal τ2 is lower than the first When the temperature is preset, the second display unit 29 is turned off (S419); if the second temperature signal D2 is higher than the first preset temperature, for example, 42 degrees, the second temperature signal T2 and the second preset temperature are continued. Comparing (S415), such as 50 degrees, if the second temperature signal D2 is higher than the second preset temperature, controlling the brightness of the second display unit 29 to be compared to 4/5 at full brightness (S417); When the temperature signal Τ2 is lower than the second preset temperature, the second temperature signal Τ2 is further compared with the third preset temperature (S415), for example, 48 degrees, and if the temperature is higher than the third temperature preset temperature, the second display unit is controlled. The brightness of 29 is compared to 3/5 of full brightness (S417); if it is lower than the third preset temperature, and so on, the second temperature signal T2 is compared with the fourth preset temperature (S415), the fourth preset If the temperature is lower than the third preset temperature, refer to Table 1 until the second temperature signal Τ2 is less than the first preset temperature. 10/15 201135155 Stop comparing and closing the second display unit 29 (S419). As can be seen from the above, the heating device of the present invention utilizes a temperature detecting unit to detect the temperature of the furnace surface and to be adjacent to the furnace surface according to the temperature of the furnace surface. The place shows flashing light, and the light has a corresponding brightness ratio with the temperature of the furnace surface. Thereby, the user can clearly judge whether the furnace surface has residual temperature, and prevent the user from accidentally touching the furnace surface with residual temperature and causing burns. However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the scope of the invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS The figure is a schematic view of an embodiment of a conventional electromagnetic heating device; = a schematic view of an embodiment of the heating device of the present invention; a block diagram. The figure is a residual temperature display control circuit of the present invention. The embodiment of the embodiment is in the form of the residual temperature display method of the heating device of the present invention-implementation [main component symbol description] 1 electromagnetic heating skirting. u body hi furnace surface heating unit 15 operating unit 17 display unit 11/15 201135155 2 heating device 2a residual temperature display control circuit 21 body 210 top plate 211 furnace surface 20 micro control unit 22 power supply circuit 23 heating unit 24 temperature detection unit 25 operation unit 26 pot detection unit 27 first display unit 271 seven-segment display 273 lights Number indicator 28 heat dissipation unit 29 second display unit 291, 295 light-emitting area 293, 297 light-shielding area 231 first temperature detecting unit 24' second temperature detecting unit is first temperature signal T2 second temperature signal C1 command signal D, detecting Step 12/15 of the residual temperature display method of the measuring device S401~S419 heating device