TW201838477A - Electromagnetic induction heating cooker - Google Patents
Electromagnetic induction heating cooker Download PDFInfo
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- TW201838477A TW201838477A TW107109830A TW107109830A TW201838477A TW 201838477 A TW201838477 A TW 201838477A TW 107109830 A TW107109830 A TW 107109830A TW 107109830 A TW107109830 A TW 107109830A TW 201838477 A TW201838477 A TW 201838477A
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
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Abstract
Description
本發明係有關於一種電磁感應加熱調理器。 The invention relates to an electromagnetic induction heating conditioner.
自以往,有一種感應加熱調理器,該感應加熱調理器係在電磁感應加熱線圈所產生之磁場內,形成配置保持調理物之鍋子的鍋子放置部,並對被放置於鍋子放置部的鍋子進行加熱調理。這種感應加熱調理器係藉由對電磁感應加熱線圈進行通電,產生磁場,而使鍋子產生感應電動勢,使鍋子本身發熱,進行加熱調理。 Conventionally, there is an induction heating conditioner. The induction heating conditioner is formed in a magnetic field generated by an electromagnetic induction heating coil to form a pot placing portion for a pot for holding a conditioner. Heat conditioning. This induction heating conditioner generates electricity by energizing an electromagnetic induction heating coil to generate a magnetic field, so that the pot generates an induced electromotive force, heats the pot itself, and performs heating conditioning.
即,這種電磁感應加熱調理器係在電磁感應加熱線圈所產生之磁場中成為電阻負載之鍋子存在,藉此,產生負載電流,而鍋子發熱,進行加熱調理。 That is, this electromagnetic induction heating conditioner exists in the pot which becomes a resistance load in the magnetic field generated by the electromagnetic induction heating coil, thereby generating a load current, and the pot generates heat to perform heating conditioning.
這種電磁感應加熱方式之加熱調理器,在電磁感應加熱線圈所產生之磁場中電阻負載不存在的情況,即,在成為電阻負載之鍋子未被配置於鍋子放置部之狀態的情況,成為無負載狀態,而負載電流未產生。 When the heating conditioner of the electromagnetic induction heating method does not have a resistance load in the magnetic field generated by the electromagnetic induction heating coil, that is, when the pot serving as the resistance load is not arranged on the pot placement portion, it becomes non-existent. Load state without load current.
使用這種現象,自以往以如下之方式控制,在對電磁感應加熱線圈進行通電時,檢測出有無產生負載電流,在無法檢測出負載電流時,判斷鍋子未被配置於鍋子放置部,並使加熱動作停止。 Using this phenomenon, it has conventionally been controlled in the following manner. When the electromagnetic induction heating coil is energized, it is detected whether a load current is generated. When the load current cannot be detected, it is determined that the pot is not placed in the pot placing portion, and The heating operation stops.
而,作為此負載電流之有無的檢測方法,有使用具有比流器之低頻交流檢測手段者(例如專利文獻1)。 In addition, as a method for detecting the presence or absence of this load current, there is a method using a low-frequency AC detection means having a current transformer (for example, Patent Document 1).
[專利文獻1]日本專利第3314124號公報 [Patent Document 1] Japanese Patent No. 3314124
可是,這種負載之有無的檢測方法,需要使用比流器,而電路的構成變成複雜。又,因為使用比流器,所以具有構成電路之元件變得昂貴的課題。 However, this method of detecting the presence or absence of a load requires a current transformer, and the circuit configuration becomes complicated. Moreover, since a current transformer is used, there is a problem that the components constituting the circuit become expensive.
本發明係為了解決上述之課題所開發者,其主要目的在於提供一種不必使用比流器,就可檢測出有無負載的電磁感應加熱調理器。 The present invention has been developed by a developer for solving the above-mentioned problems, and a main object thereof is to provide an electromagnetic induction heating conditioner that can detect the presence or absence of a load without using a current transformer.
為了解決上述之課題,在電磁感應加熱調理器,包括:鍋子放置部;電磁感應加熱線圈,係在鍋子放置部產生磁場;變頻電路,係包括切換元件,並將電力供給至電磁感應加熱線圈;時序輸出電路,係從輸入電壓與切換元件之電壓產生變頻電路的輸出控制時序波形;輸入電壓變動檢測電路,係檢測出輸入電壓的變動,並產生輸入電壓變動波形;負載檢測電路,係根據輸入電壓變動波形與輸出控制時序波形,進行負載檢測;以及主控制電路,係根據負載檢測,判斷是否鍋子被設置於鍋子放置部;負載檢測電路係構成為根據輸入電壓變動波形中輸出控制時序波形為High位準之間的輸入電壓變動波 形,進行負載檢測。 In order to solve the above-mentioned problems, the electromagnetic induction heating conditioner includes a pot placing portion; the electromagnetic induction heating coil generates a magnetic field in the pot placing portion; the frequency conversion circuit includes a switching element and supplies power to the electromagnetic induction heating coil; The timing output circuit is to generate the output control timing waveform of the frequency conversion circuit from the input voltage and the voltage of the switching element; the input voltage change detection circuit is to detect the change of the input voltage and generate the input voltage change waveform; the load detection circuit is to be based on the input The voltage fluctuation waveform and the output control timing waveform are used for load detection; and the main control circuit is based on the load detection to determine whether the pot is installed in the pot placement section; the load detection circuit is configured to output the control timing waveform based on the input voltage fluctuation waveform as The input voltage fluctuation waveform between high levels is used for load detection.
若依據本發明,可提供一種電磁感應加熱調理器,該電磁感應加熱調理器係藉由根據輸入電壓變動波形中輸出控制時序波形為High位準之間的輸入電壓變動波形,進行該負載檢測,不必使用比流器,就可高精度地檢測出有無負載。 According to the present invention, an electromagnetic induction heating conditioner can be provided. The electromagnetic induction heating conditioner performs the load detection by using an input voltage variation waveform between an output control timing waveform and a High level according to an input voltage variation waveform. The presence or absence of a load can be detected with high accuracy without using a current transformer.
1‧‧‧商用低頻交流電源 1‧‧‧Commercial low frequency AC power supply
2‧‧‧全波整流電路 2‧‧‧full wave rectifier circuit
3‧‧‧平滑電容器 3‧‧‧ smoothing capacitor
4‧‧‧電磁感應加熱線圈 4‧‧‧ electromagnetic induction heating coil
5‧‧‧共振電容器 5‧‧‧Resonant capacitor
6‧‧‧切換元件 6‧‧‧ switching element
7‧‧‧二極體 7‧‧‧diode
8‧‧‧電阻 8‧‧‧ resistance
9‧‧‧輸入電壓變動檢測電路 9‧‧‧Input voltage fluctuation detection circuit
10‧‧‧切換控制電路 10‧‧‧ Switching control circuit
11‧‧‧主控制電路 11‧‧‧Main control circuit
12‧‧‧時序輸出電路 12‧‧‧sequence output circuit
13‧‧‧電壓檢測電路 13‧‧‧Voltage detection circuit
14‧‧‧輸入電壓檢測電路 14‧‧‧Input voltage detection circuit
15‧‧‧負載檢測電路 15‧‧‧Load detection circuit
N‧‧‧鍋子 N‧‧‧ Pot
P‧‧‧鍋子放置部 P‧‧‧Pot placing section
S‧‧‧電路 S‧‧‧circuit
50‧‧‧電磁感應加熱調理器 50‧‧‧ electromagnetic induction heating conditioner
51a‧‧‧電源插頭 51a‧‧‧Power Plug
第1圖係表示第1實施形態之電磁感應加熱調理器的電路S之構成的方塊圖。 Fig. 1 is a block diagram showing a configuration of a circuit S of the electromagnetic induction heating conditioner of the first embodiment.
第2圖係表示第1實施形態之電磁感應加熱調理器的加熱動作中之有鍋子時之動作波形的圖形。 Fig. 2 is a graph showing an operation waveform when a pot is in the heating operation of the electromagnetic induction heating conditioner of the first embodiment.
第3圖係表示第1實施形態之電磁感應加熱調理器的加熱動作中之無鍋子時之動作波形的圖形。 Fig. 3 is a graph showing an operation waveform when there is no pan during the heating operation of the electromagnetic induction heating conditioner of the first embodiment.
第4圖係第2實施形態之電磁感應加熱調理器的立體圖。 Fig. 4 is a perspective view of an electromagnetic induction heating conditioner according to a second embodiment.
第5圖係第4圖之A-A剖面圖。 Fig. 5 is a sectional view taken along the line A-A in Fig. 4;
參照第1圖~第3圖,說明第1實施形態。 The first embodiment will be described with reference to FIGS. 1 to 3.
第1圖係表示電磁感應加熱調理器的電路S之構成的方塊圖。 FIG. 1 is a block diagram showing a configuration of a circuit S of an electromagnetic induction heating conditioner.
商用低頻交流電源1係與全波整流電路2連接。此全波整流電路2的輸出係藉平滑電容器3及抗流線圈(未圖示)所平滑化。 Commercial low-frequency AC power supply 1 is connected to full-wave rectifier circuit 2. The output of this full-wave rectifier circuit 2 is smoothed by a smoothing capacitor 3 and a choke coil (not shown).
平滑化之輸出係經由高頻感應加熱用之電磁感應 加熱線圈4,與由和電磁感應加熱線圈4串聯地連接之共振電容器5、切換元件6以及二極體7所構成的並聯電路連接。這些元件構成將直流變換成交流的變頻電路,並將電力供給至電磁感應加熱線圈4。此外,在從變頻電路接受電力之電磁感應加熱線圈4所產生的磁場內,設置將保持調理物的鍋子N配置於內部的鍋子放置部P。 The smoothed output is connected to a parallel circuit composed of a resonance capacitor 5, a switching element 6, and a diode 7 connected in series with the electromagnetic induction heating coil 4 via an electromagnetic induction heating coil 4 for high-frequency induction heating. These elements constitute a frequency conversion circuit that converts DC to AC, and supplies power to the electromagnetic induction heating coil 4. In addition, in a magnetic field generated by the electromagnetic induction heating coil 4 that receives power from the frequency conversion circuit, a pot placing portion P in which a pot N holding a conditioner is disposed is provided.
其次,切換元件6係由切換控制電路10所控制。切換控制電路10係與主控制電路11連接,並根據來自主控制電路11的切換控制信號所控制。主控制電路11係具有微處理器及記憶體,並進行電磁感應加熱調理器之加熱動作的控制或各種通知的控制、及上述之各部的控制之主要的控制電路。 Next, the switching element 6 is controlled by a switching control circuit 10. The switching control circuit 10 is connected to the main control circuit 11 and controlled by a switching control signal from the main control circuit 11. The main control circuit 11 is a main control circuit having a microprocessor and a memory, and controlling the heating operation of the electromagnetic induction heating conditioner or various notifications, and the control of each of the above sections.
其次,在平滑電容器3,經由電阻8連接時序輸出電路12與輸入電壓檢測電路14。而,以輸入電壓檢測電路14所檢測出之輸入電壓係被輸入主控制電路11,而檢測出商用低頻交流的電源電壓。時序輸出電路12係亦與切換元件6的集極端子連接,以商用低頻交流的電源電壓為基準,檢測出切換元件6之集極-射極間電壓Vce從0V變化的時序,或變成0V的時序後,產生輸出控制時序波形,並被輸入主控制電路11。電壓檢測電路13係與切換元件6的集極端子連接,並檢測出切換元件6之集極-射極間電壓Vce,輸入主控制電路11。 Next, the smoothing capacitor 3 is connected to the timing output circuit 12 and the input voltage detection circuit 14 via a resistor 8. The input voltage detected by the input voltage detection circuit 14 is input to the main control circuit 11 and a commercial low-frequency AC power supply voltage is detected. The timing output circuit 12 is also connected to the collector terminal of the switching element 6. Based on the commercial low-frequency AC power supply voltage, the timing of the change in the collector-emitter voltage Vce of the switching element 6 from 0V or 0V is detected. After the timing, an output control timing waveform is generated and input to the main control circuit 11. The voltage detection circuit 13 is connected to the collector terminal of the switching element 6, and detects the collector-emitter voltage Vce of the switching element 6 and inputs the voltage Vce to the main control circuit 11.
在平滑電容器3,連接檢測出輸入電壓的變動,並產生輸入電壓變動波形的輸入電壓變動檢測電路9。而,來自輸入電壓變動檢測電路9之輸入電壓變動波形、與來自時序輸出電路12的輸出控制時序波形被輸入負載檢測電路15。負載檢 測電路15係根據來自輸入電壓變動檢測電路9之輸入電壓變動波形、與來自時序輸出電路12的輸出控制時序波形,檢測出有無負載電流。而,主控制電路11係根據來自負載檢測電路15之有無負載電流的檢側信號,判斷在鍋子放置部P有無鍋子。 The smoothing capacitor 3 is connected to an input voltage fluctuation detection circuit 9 that detects a change in the input voltage and generates an input voltage fluctuation waveform. The input voltage fluctuation waveform from the input voltage fluctuation detection circuit 9 and the output control timing waveform from the timing output circuit 12 are input to the load detection circuit 15. The load detection circuit 15 detects the presence or absence of a load current based on the input voltage fluctuation waveform from the input voltage fluctuation detection circuit 9 and the output control timing waveform from the timing output circuit 12. In addition, the main control circuit 11 judges the presence or absence of a pot in the pot placement portion P based on the detection-side signal of the presence or absence of a load current from the load detection circuit 15.
主控制電路11係雖未圖示,藉對設置於電磁感應加熱調理器之操作部的操作輸入,調整切換控制信號的脈寬,來選擇加熱的強弱。或者,藉所裝入之控制程式,固定地控制加熱的強弱,或使強弱可變。又,主控制電路11係根據來自負載檢測電路15的檢側信號,判斷有無鍋子後,控制加熱的強弱或停止。 Although the main control circuit 11 is not shown in the figure, the operation input of the electromagnetic induction heating conditioner is used to adjust the pulse width of the switching control signal to select the strength of the heating. Alternatively, the control program can be used to control the heating strength or make the strength variable. In addition, the main control circuit 11 controls the intensity of the heating or stops after determining whether there is a pan or not based on the detection-side signal from the load detection circuit 15.
第2圖係電磁感應加熱調理器的加熱動作中之有鍋子時之動作波形,分別表示(a)切換元件6之集極-射極間電壓Vce、(b)輸出控制時序波形、(c)切換元件電流、(d)輸入電壓變動波形、(e)切換元件驅動信號。此外,有鍋子之狀態係鍋子N被放置於鍋子放置部P之狀態。 Figure 2 shows the operation waveforms when a pot is in the heating operation of the electromagnetic induction heating conditioner, which represent (a) the collector-emitter voltage Vce of the switching element 6, (b) the output control timing waveform, and (c) Switching element current, (d) input voltage fluctuation waveform, and (e) switching element drive signal. In addition, the state with the pan is the state in which the pan N is placed on the pan placing portion P.
切換控制電路10係收到來自主控制電路11之切換控制信號後,輸出切換元件驅動信號。切換元件驅動信號為ON(High位準)時,切換元件6係變成導通,而切換元件電流Ic流動。在切換元件6變成導通之間,切換元件6之集極-射極間電壓Vce係變成0V。 The switching control circuit 10 outputs a switching element driving signal after receiving a switching control signal from the main control circuit 11. When the switching element driving signal is ON (High level), the switching element 6 is turned on, and the switching element current Ic flows. Before the switching element 6 is turned on, the collector-emitter voltage Vce of the switching element 6 becomes 0V.
藉收到來自主控制電路11之切換控制信號的切換控制電路10,切換元件驅動信號變成OFF(Low位準)時,切換元件電流Ic係變成不流動,另一方面,切換元件6之集極-射極間電壓Vce係開始上升。此時所產生之切換元件6的集極-射極 間電壓Vce係大小與在切換元件6為ON時所流動的切換元件電流Ic成正比地變化。 By receiving the switching control circuit 10 of the switching control signal from the main control circuit 11, when the switching element driving signal is turned OFF (Low level), the switching element current Ic becomes non-flowing. On the other hand, the collector of the switching element 6- The inter-emitter voltage Vce starts to rise. The magnitude of the collector-emitter voltage Vce of the switching element 6 generated at this time varies in proportion to the switching element current Ic flowing when the switching element 6 is ON.
使切換元件6變成OFF的時序係主控制電路11根據加熱的強弱來控制。又,切換元件6之集極-射極間電壓Vce的週期係根據電磁感應加熱線圈4與進行感應加熱之鍋子的電抗成分、及共振電容器5之共振頻率而決定。 The timing for turning the switching element 6 OFF is controlled by the main control circuit 11 according to the strength of the heating. The period of the collector-emitter voltage Vce of the switching element 6 is determined based on the reactance components of the electromagnetic induction heating coil 4 and the pot for induction heating, and the resonance frequency of the resonance capacitor 5.
在根據共振頻率而決定之週期,切換元件6之集極-射極間電壓Vce係變成0V。檢測出此切換元件6之集極-射極間電壓Vce從0V變化的時序、及變成0V的時序,時序輸出電路12係產生與切換元件6之集極-射極間電壓波形同步的輸出控制時序波形,並向主控制電路11輸入。 At a period determined according to the resonance frequency, the collector-emitter voltage Vce of the switching element 6 becomes 0V. The timing at which the collector-emitter voltage Vce of this switching element 6 changes from 0V and the timing at which it becomes 0V is detected. The timing output circuit 12 generates output control synchronized with the waveform of the collector-emitter voltage of the switching element 6. The timing waveform is input to the main control circuit 11.
檢測出輸出控制時序波形的下降緣,即切換元件6之集極-射極間電壓Vce變成0V的主控制電路11係在固定期間之後,輸出切換控制信號,而在切換控制電路10使切換元件驅動信號變成ON。 The main control circuit 11 that detects the falling edge of the output control timing waveform, that is, the collector-emitter voltage Vce of the switching element 6 becomes 0V, outputs a switching control signal after a fixed period, and the switching control circuit 10 causes the switching element The drive signal turns ON.
切換元件電流Ic係在切換元件6之集極-射極間電壓Vce變成0V時,藉變頻電路之再生電流Ir在逆向流動。切換元件6之集極-射極間電壓Vce變成0V後,至主控制電路11輸出切換控制信號,而在切換控制電路10使切換元件驅動信號變成ON的固定期間係此再生電流Ir穩定的期間較佳。 The switching element current Ic is when the collector-emitter voltage Vce of the switching element 6 becomes 0V, and the regenerative current Ir by the frequency conversion circuit flows in the reverse direction. After the collector-emitter voltage Vce of the switching element 6 becomes 0V, the switching control signal is output to the main control circuit 11, and the fixed period during which the switching control circuit 10 turns the driving signal of the switching element ON is a period during which the regenerative current Ir is stable. Better.
輸入電壓變動波形係與切換元件電流Ic之大小成正比地變動。藉由切換元件6變成ON,切換元件電流Ic流動。此切換元件電流Ic係從商用低頻交流電源1與平滑電容器3所儲存之電流供給。在此時,從平滑電容器3所供給之電流的量 係在切換元件6變成OFF的期間B,由商用低頻交流電源1被供給至平滑電容器3。 The input voltage fluctuation waveform fluctuates in proportion to the magnitude of the switching element current Ic. When the switching element 6 is turned ON, the switching element current Ic flows. This switching element current Ic is supplied from the current stored in the commercial low-frequency AC power supply 1 and the smoothing capacitor 3. At this time, the amount of current supplied from the smoothing capacitor 3 is supplied to the smoothing capacitor 3 from the commercial low-frequency AC power supply 1 during the period B in which the switching element 6 is turned OFF.
在切換元件6變成OFF的期間(B),不僅包含發生切換元件6之集極-射極間電壓Vce的期間(C),而且包含至切換元件驅動信號變成ON的期間(D),此固定期間(D)係發生再生電流Ir,因為來自共振電容器5的再生電流Ir流入平滑電容器3,所以輸入電壓變動波形變大。以後電流逐漸地被儲存於平滑電容器3,藉由輸入電壓變平滑化,輸入電壓變動波形係變成不變。 The period (B) during which the switching element 6 turns OFF includes not only the period (C) during which the collector-emitter voltage Vce of the switching element 6 occurs, but also the period (D) until the switching element driving signal turns ON. This is fixed. The period (D) is a regenerative current Ir. Since the regenerative current Ir from the resonance capacitor 5 flows into the smoothing capacitor 3, the input voltage fluctuation waveform becomes large. After that, the current is gradually stored in the smoothing capacitor 3, and the input voltage fluctuation waveform becomes constant as the input voltage is smoothed.
負載檢測電路15係使用輸出控制時序波形,在輸出控制時序波形為Low位準之間(變成OFF的期間),係構成為藉由使輸入電壓變動波形降低至Low,而在再生電流Ir所流動的期間(H)與切換元件6變成ON的期間(I)之間不檢測出輸入電壓變動量,並向主控制電路11輸入期間(C)之間的輸入電壓變動量。即,根據輸出控制時序波形為High位準之間(變成ON的期間)的輸入電壓變動波形之面積K的大小,進行負載檢測。 The load detection circuit 15 uses an output control timing waveform. When the output control timing waveform is at a Low level (the period during which it becomes OFF), the load detection circuit 15 is configured to reduce the input voltage fluctuation waveform to Low and allow the regenerative current Ir to flow. The input voltage fluctuation amount is not detected between the period (H) and the period (I) when the switching element 6 is turned on, and the main control circuit 11 is input with the input voltage fluctuation amount between the periods (C). That is, the load detection is performed based on the area K of the input voltage fluctuation waveform whose output control timing waveform is between the High level (the period during which it turns ON).
其次,說明鍋子N未被放置於鍋子放置部P之狀態。第3圖係本發明之電磁感應加熱調理器的加熱動作中之無鍋子時之動作波形,分別表示(a)切換元件6之集極-射極間電壓Vce、(b)輸出控制時序波形、(c)切換元件電流、(d)輸入電壓變動波形、(e)切換元件驅動信號。此外,無鍋子係鍋子N未被放置於鍋子放置部P之狀態。 Next, a state in which the pot N is not placed on the pot placing portion P will be described. FIG. 3 shows the operation waveforms when there is no pot during the heating operation of the electromagnetic induction heating conditioner of the present invention, which respectively represent (a) the collector-emitter voltage Vce of the switching element 6, and (b) the output control timing waveforms, (c) Switching element current, (d) Input voltage fluctuation waveform, and (e) Switching element drive signal. In addition, the pan-less pan N is not placed in the pan placement portion P.
輸入電壓變動波形係波形的大小與切換元件6變成ON時之切換元件電流Ic成正比地變化。因此,在無鍋子N之 狀態的情況,輸入電壓變動波形變成比有鍋子N之狀態小。負載檢測電路15係使用輸出控制時序波形,在輸出控制時序波形為Low位準之間(變成OFF的期間),係構成為藉由使輸入電壓變動波形降低至Low,而在再生電流Ir所流動的期間(L)與切換元件6變成ON的期間(M)之間不檢測出輸入電壓變動量,並向控制電路輸入期間(N)之間的輸入電壓變動量。即,根據輸出控制時序波形為High位準之間(變成ON的期間)的輸入電壓變動波形之面積Q,進行負載檢測。 The magnitude of the input voltage fluctuation waveform is changed in proportion to the switching element current Ic when the switching element 6 is turned on. Therefore, in the state without the pot N, the input voltage fluctuation waveform becomes smaller than in the state with the pot N. The load detection circuit 15 uses an output control timing waveform. When the output control timing waveform is at a Low level (the period during which it becomes OFF), the load detection circuit 15 is configured to reduce the input voltage fluctuation waveform to Low and allow the regenerative current Ir to flow. The input voltage fluctuation amount is not detected between the period (L) and the period (M) during which the switching element 6 is turned on, and the input voltage fluctuation amount is input to the control circuit. That is, the load detection is performed based on the area Q of the input voltage fluctuation waveform between the output control timing waveform and the High level (the period during which it turns ON).
如以上所示,在進行判斷有無鍋子N之負載檢測時,在輸出控制時序波形為Low位準之間,係構成為藉由使輸入電壓變動波形降低至Low,而在再生電流Ir所流動的期間與切換元件6變成ON的期間之間不檢測輸入電壓變動量,並是再生電流Ir未流動的期間,因為根據切換元件6變成OFF之間的輸入電壓變動波形之面積Q(積分值),進行負載檢測,所以可降低再生電流Ir所造成之輸入電壓之變動的影響。 As shown above, when the load detection of the presence or absence of the pot N is performed, the output control timing waveform is Low, and the input voltage fluctuation waveform is reduced to Low, and the regenerative current Ir flows. The amount of input voltage fluctuation is not detected between the period and the period when the switching element 6 is turned on, and is a period during which the regenerative current Ir does not flow, because the area Q (integrated value) of the input voltage variation waveform between the time when the switching element 6 turns off, Since the load detection is performed, the influence of the fluctuation of the input voltage caused by the regenerative current Ir can be reduced.
即,是再生電流Ir未流動的期間且切換元件6變成OFF的期間係在有鍋子N的情況與無的情況,在輸入電壓變動波形出現大的差,所以可更高精度地判斷有無負載檢測,而可提高負載檢測的精度。此外,在實際之負載檢測的判斷係在上述之面積Q與面積K比某臨限值X大的情況,判斷有負載(有鍋子N),而在未滿臨限值X的情況係判斷無負載(無鍋子N)。臨限值X係被設定位於面積Q的值與面積K的值之間的值。 That is, the period in which the regenerative current Ir does not flow and the period in which the switching element 6 is OFF are between the presence and absence of the pot N, and a large difference occurs in the input voltage fluctuation waveform, so that the presence or absence of load detection can be determined more accurately. , Which can improve the accuracy of load detection. In addition, in the actual load detection judgment, when the above-mentioned area Q and area K are larger than a certain threshold X, it is judged that there is a load (with a pot N), and when the threshold X is not reached, it is judged that there is no Load (without pan N). The threshold X is set to a value between the value of the area Q and the value of the area K.
參照第4圖及第5圖,說明第2實施形態。第4圖係 包括第1實施形態的電路S之電磁感應加熱調理器50的立體圖。第5圖係第4圖之A-A剖面圖。此外,與第1實施形態相同的構成係附加相同的符號,並省略說明。 The second embodiment will be described with reference to FIGS. 4 and 5. Fig. 4 is a perspective view of the electromagnetic induction heating conditioner 50 including the circuit S of the first embodiment. Fig. 5 is a sectional view taken along the line A-A in Fig. 4; The same components as those in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
電磁感應加熱調理器50具有本體51、蓋體52以及鍋子N。鍋子放置部P被形成於本體51。鍋子放置部P係朝向本體51之上方向開口的凹部,並構成為在鍋子N在內部保持調理物之狀態,可收容。 The electromagnetic induction heating conditioner 50 includes a main body 51, a lid body 52, and a pan N. The pan placement part P is formed in the main body 51. The pot placing portion P is a recessed portion that opens toward the upper portion of the main body 51, and is configured to hold the conditioner inside the pot N and can be accommodated.
蓋體52係為了開閉本體51之鍋子放置部P的開口,而對本體51被安裝成軸支後端部分。在蓋體52對本體51打開之狀態,可對鍋子放置部P拆裝鍋子N。又,將鍋子N設置於鍋子放置部P,在蓋體52對本體51關閉之狀態,鍋子N係被本體51與蓋體52所覆蓋,並被保持於電磁感應加熱調理器50的內部。 The cover body 52 is attached to the main body 51 as a rear end portion of the shaft in order to open and close the opening of the pot placement portion P of the main body 51. In a state where the lid body 52 is opened to the main body 51, the pot N can be detached from the pot placing portion P. In addition, the pot N is installed in the pot placing portion P, and the cover N is covered with the body 51 and the cover 52 in a state where the cover 52 is closed to the body 51 and is held inside the electromagnetic induction heating conditioner 50.
因此,鍋子N係在從電磁感應加熱調理器50的外側無法看到之狀態,被保持於電磁感應加熱調理器50的內部。即,這種電磁感應加熱調理器50係在蓋體52對本體51關閉之狀態的情況,成為從外部無法識別是否鍋子N被設置於本體51的內部。 Therefore, the pan N is in a state in which it cannot be seen from the outside of the electromagnetic induction heating conditioner 50 and is held inside the electromagnetic induction heating conditioner 50. That is, in the case where the electromagnetic induction heating conditioner 50 is in a state where the cover body 52 is closed to the main body 51, it is impossible to recognize from the outside whether or not the pot N is installed inside the main body 51.
其次,將構成電路S的電磁感應加熱線圈4設置於是此鍋子放置部P下方且本體51的內部。電路S具有電源插頭51a。此電源插頭51a係被導出至本體51的外部,並與商用低頻交流電源1連接,藉此,電磁感應加熱調理器50係得到電力。 Next, the electromagnetic induction heating coil 4 constituting the circuit S is disposed below the pot placement portion P and inside the body 51. The circuit S has a power plug 51a. This power plug 51a is led out to the outside of the main body 51, and is connected to a commercial low-frequency AC power supply 1, whereby the electromagnetic induction heating conditioner 50 receives power.
又,被設置於鍋子放置部P之鍋子N的底面係位於此電磁感應加熱線圈4所產生之磁場內。即,鍋子N係藉電磁感 應加熱線圈4所產生之磁場的變化而被進行感應加熱,可進行內部所保持之調理物的加熱調理。又,電路S被設置於本體51的內部。 The bottom surface of the pot N installed in the pot placing portion P is located in a magnetic field generated by the electromagnetic induction heating coil 4. That is, the pan N is induction-heated by the change of the magnetic field generated by the heating coil 4 by electromagnetic induction, and can heat-condition the conditioning substance held inside. The circuit S is provided inside the body 51.
藉由如以上所示構成各部,可更高精度地判斷有無負載檢測,因為可提高負載檢測的精度,所以可高精度地判斷是否在電磁感應加熱調理器50的內部保持鍋子N。因此,即使使用者忘記將鍋子N放入電磁感應加熱調理器50並使加熱動作開始,亦可調精度地進行負載檢測,偵測到無鍋子N之狀態,可停止浪費的加熱調理動作。此外,本實施形態之電磁感應加熱調理器50係例如有煮飯的電鍋或進行煮東西等之調理的電調理器等。 By configuring each unit as described above, the presence or absence of load detection can be determined more accurately, and the accuracy of load detection can be improved, so it can be accurately determined whether or not the pot N is held inside the electromagnetic induction heating conditioner 50. Therefore, even if the user forgets to put the pot N in the electromagnetic induction heating conditioner 50 and start the heating operation, the load detection can be performed with accuracy, and a state without the pot N can be detected, and the wasteful heating conditioning operation can be stopped. The electromagnetic induction heating conditioner 50 of the present embodiment is, for example, an electric cooker for cooking rice, or an electrical conditioner for conditioning such as cooking.
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US5111014A (en) * | 1988-06-14 | 1992-05-05 | Kabushiki Kaisha Toshiba | Electromagnetic cooker including load control |
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JP2003070641A (en) * | 2001-08-31 | 2003-03-11 | Matsushita Electric Ind Co Ltd | Electromagnetic induction heating rice boiler |
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WO2007056050A1 (en) * | 2005-11-03 | 2007-05-18 | Kurt Manufacturing Company, Inc. | Controller to provide a uniform temperature for electric frying pans |
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