CN101953626B - Rice cooker - Google Patents
Rice cooker Download PDFInfo
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- CN101953626B CN101953626B CN200910207898.9A CN200910207898A CN101953626B CN 101953626 B CN101953626 B CN 101953626B CN 200910207898 A CN200910207898 A CN 200910207898A CN 101953626 B CN101953626 B CN 101953626B
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Abstract
The invention provides a rice cooker which can enlarge permitted changing range of the supply voltage, and can reliably determined whether the cooker is existed or not in an area with unstable supply voltage. The rice cooker comprises a converter circuit consisting of heating coils, a resonant capacitor and a large power element; a current detecting device which is used for detecting the AC current flowing into a diode bridge rectifier circuit and outputting the voltage which is directly proportional to the detected current; a converter voltage detecting device which is used for detecting the voltage in a converter circuit and outputting the voltage which is directly proportional to the detected voltage; a supply voltage detecting circuit which is used for detecting the mains supply voltage; and a cooker detecting device which is used for judging whether the cooker is installed on the regulated position when the output voltage of the converter voltage detecting device is higher than the output voltage of the current detecting device in a regulated threshold voltage. Under the condition that the detecting voltage of the supply voltage detecting circuit is higher than the standard voltage, the threshold voltage is set to be higher than the preset threshold voltage.
Description
Technical field
The present invention relates to a kind of electric cooker, more particularly, relate to a kind of be used in general family expenses or business with in electric cooker, before the operation of cooking starts, detect the device whether pot of putting in advance meter He Shui is installed to the pot host cavity of electric rice cooker body.
Background technology
Existing frequency conversion type electric cooker is generally provided with respectively the testing circuit that input current and frequency converter voltage are detected, and the circuit output corresponding with detecting electric current and detection voltage of each testing circuit is compared, in the situation that the output of voltage frequency converter voltage detection circuit is greater than the output of input current testing circuit, be judged to be pot and be not installed in assigned position (the pot host cavity in electric rice cooker body), an example wherein can be with reference to Japanese Patent Publication communique Unexamined Patent 2-95315.Existing electric cooker in this list of references 1 has been shown in Fig. 4.As shown in Figure 4, this electric cooker is by forming with lower member: heater coil 6, resonating capacitor 7, the frequency converter consisting of high-power components 8, current sensing means 2, frequency converter voltage checkout gear 3, pot checkout gear 9 and transducer control circuit 10.
But, adopt the words of the formation of above-mentioned existing electric cooker, while being greater than the output (voltage) of input current testing circuit due to the output at voltage frequency converter voltage detection circuit (voltage), will be judged to be pot does not install, therefore in mains voltage change, particularly in the situation that mains voltage uprises, the output of frequency converter voltage will become higher than the output of input current.For instance, if the detection electric current of input current testing circuit is I when mains voltage is normal voltage
1, the detection voltage of voltage frequency converter voltage detection circuit is V
1, and the detection electric current of input current testing circuit is I when mains voltage is higher than normal voltage
2, the detection voltage of voltage frequency converter voltage detection circuit is V
2time, I
1=I
2, and V
1< V
2.Like this, even in the situation that having pot, be also likely judged as without pot.In general design, although also can take into account voltage change to a certain degree when setting the decision level of pot checkout gear, but in the unsettled area of mains supply, if voltage has exceeded the scope of anticipation at short notice, can produce the problem that erroneous judgement occurs pot checkout gear.
Summary of the invention
The present invention is intended to solve the above-mentioned problems in the prior art, its object is to provide a kind of permission mobility scale that can expand supply voltage, even if also can carry out reliably the electric cooker that pot has or not judgement (judging before cooking whether pot is installed in the pot host cavity in electric rice cooker body) in the unsettled area of supply voltage.
In order to solve the above-mentioned problems in the prior art, electric cooker of the present invention comprises: detect the alternating current flowing through in diode bridge rectifier circuit, the current sensing means of also exporting the voltage being directly proportional to detection electric current; Detect voltage in converter circuit, and the frequency converter voltage checkout gear of the voltage that is directly proportional with detection voltage of output; Detect the voltage detection circuit of mains voltage; While exceeding the threshold voltage of regulation with output voltage at frequency converter voltage checkout gear than the output voltage of current sensing means, judge that pot is not installed to the pot checkout gear on assigned position.In the situation that the detection voltage ratio normal voltage of voltage detection circuit is high, threshold voltage is configured to higher than predefined threshold voltage.
Like this, the decision level of pot checkout gear can change according to the change of supply voltage, the permission mobility scale of supply voltage can expand, even also can carry out reliably pot in the unsettled area of supply voltage, have or not judgement, before cooking, judge whether pot installs in the pot host cavity in electric rice cooker body.
The technique effect that the present invention produces is as follows.After adopting the electric cooker described in the present invention, can expand the permission mobility scale of supply voltage, even also can carry out reliably pot in the unsettled area of supply voltage, have or not judgement, before cooking, judge whether pot installs in the host cavity in electric rice cooker body.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the electric cooker in the embodiment of the present invention 1,
Fig. 2 carries out pot to have or not the schematic diagram of judgement in the embodiment of the present invention 1,
Fig. 3 is the another kind of circuit block diagram that has used frequency converter in the embodiment of the present invention 1,
Fig. 4 is the circuit block diagram of existing electric cooker.
In above-mentioned accompanying drawing, 1 is mains supply, and 2 is current sensing means, 2a is power pack, and 2b is current-voltage conversion circuit, and 3 is diode bridge rectifier circuit, 4 is smmothing capacitor, and 5 is frequency converter voltage checkout gear, and 6 is heater coil, 7 is resonating capacitor, and 8 is high-power components, and 9 is pot checkout gear, 9a is comparison circuit, and 9b is that pot has or not decision circuit, and 10 is transducer control circuit, 11 is high-power components drive circuit, and 12 is voltage detection circuit, 13 pots for the use of cooking.
The specific embodiment
(embodiment 1)
Fig. 1 is for representing the circuit block diagram of the rice cooker structure in the present invention the 1st embodiment.In Fig. 1, mains supply 1 is transformed into DC voltage by diode bridge rectifier circuit 3, heater coil 6, resonating capacitor 7 and high-power components 8 form converter circuit, this converter circuit produces RF power, RF power is supplied on the pot for cooking rice 13 that is arranged on heater coil 6 tops with the form of high frequency magnetic field, make to produce vortex flow in pot for cooking rice 13, then the Jiao Erre producing by vortex flow heats pot for cooking rice 13.
In addition, power pack 2a and current-voltage conversion circuit 2b have formed current sensing means 2, and current sensing means 2 produces the voltage being directly proportional to the alternating current flow valuve flowing in diode bridge rectifier circuit 3.In addition, frequency converter voltage checkout gear 5 is for detection of the voltage occurring in converter circuit, and what in Fig. 1, detect is the voltage being added on high-power components 8.In addition, voltage detection circuit 12 for detection of mains voltage the amplitude of fluctuation with respect to normal voltage.
The output of current sensing means 2 and frequency converter voltage checkout gear 5 compares in the comparison circuit 9a of pot checkout gear 9, and its comparative result outputs to pot and has or not in decision circuit 9b.At pot, have or not in decision circuit 9b, according to the output of voltage detection circuit 12, calculate compensating value, in the situation that the output that frequency converter voltage is detected adds that than the output of current sensing means the value after compensating value is large, be judged to be without pot.
The decision method of pot checkout gear has been shown in Fig. 2.Pot checkout gear first sets compensating value A according to the output of supply voltage test section, again the output of input current detecting device is added to value after compensating value and the output of frequency converter voltage checkout gear compare, in the situation that frequency converter voltage rises to over nothing pot decision level, be judged to be without pot.
If compensating value during normal voltage is A1, compensating value when voltage is excessive is A2, and the relation of A1 and A2 is set as A1 < A2.
As shown in Figure 2, if input current detected value during normal voltage is Iin1, the detected value of frequency converter voltage is Vin1, and operating point is on the position shown in 31.Afterwards, when supply voltage rise, while being above standard voltage, because frequency converter voltage rises, operating point will be transferred to 32.At this moment on the position of operating point in Iin1, Vin2.In the situation that input current is not carried out to revisal, because operating point 32 has arrived without pot decision level, therefore even there is the state of pot, can be judged to be mistakenly without pot yet.
In the present embodiment, first according to the output of voltage detection circuit, set compensating value, and the compensating value A2 while adding excessive voltage on Iin1, calculate Iin2, then Iin2 and Vin2 are compared.
After adding compensating value, the operating point that pot testing circuit is judged is 33, with respect to thering is sufficient surplus without pot decision level, thereby can expand the permission excursion of supply voltage, even if also can carry out pot reliably in the unsettled area of supply voltage, have or not judgement.
In addition, although employing in the present embodiment is input current to be carried out to the method for revisal, also can adopt the mode that frequency converter voltage is carried out revisal or nothing pot decision level is carried out to revisal.Obviously, adopt these modes also can reach same effect.
Fig. 3 is that the present invention is applied in the example in double hose frequency converter.
In Fig. 3, the voltage rising part producing because of the work of frequency converter is used as the detection voltage of frequency converter voltage, adopts such method also can reach same effect.
In sum, electric cooker in the present invention can expand the permission mobility scale of supply voltage, in the unsettled area of supply voltage, also can carry out reliably pot and have or not judgement, therefore can be widely used in the electric cooker that uses in the stable not area of supply voltage etc.
Claims (1)
1. an electric cooker, is characterized in that comprising:
Mains supply is transformed into the diode bridge rectifier circuit of DC voltage;
The heater coil of high frequency magnetic field is provided to pot;
The converter circuit being formed by described heater coil, resonating capacitor and high-power components;
Current sensing means to the voltage that alternating current mobile in described diode bridge rectifier circuit detects, also output is directly proportional to detection electric current;
Detect voltage in described converter circuit, and the frequency converter voltage checkout gear of the voltage that is directly proportional with detection voltage of output;
Detect the voltage detection circuit of mains voltage; With
When the output voltage of described frequency converter voltage checkout gear surpasses the output voltage of described current sensing means and reaches the threshold voltage of regulation when above, judge that pot is not arranged on pot checkout gear on assigned position,
In the situation that the detection voltage ratio normal voltage of described voltage detection circuit is high, according to the output of power voltage detection device, set compensating value, the value after the output of input current detecting device adds the above compensating value is as described threshold voltage again.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-165643 | 2009-07-14 | ||
| JP2009165643A JP2011023163A (en) | 2009-07-14 | 2009-07-14 | Rice cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101953626A CN101953626A (en) | 2011-01-26 |
| CN101953626B true CN101953626B (en) | 2014-04-09 |
Family
ID=43481406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910207898.9A Active CN101953626B (en) | 2009-07-14 | 2009-11-06 | Rice cooker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2011023163A (en) |
| CN (1) | CN101953626B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2932794B1 (en) * | 2012-12-11 | 2017-03-08 | Arçelik Anonim Sirketi | An induction heating cooktop |
| CN105230120B (en) * | 2012-12-11 | 2017-05-03 | 阿塞里克股份有限公司 | An induction heating cooktop |
| EP2779787B1 (en) | 2013-03-11 | 2015-06-17 | Electrolux Appliances Aktiebolag | Method of detecting cookware on an induction hob, induction hob and cooking appliance |
| CN103720342A (en) * | 2013-12-16 | 2014-04-16 | 广西柳州浚业科技有限公司 | Frequency conversion electric heating cup |
| CN108633117B (en) * | 2017-03-23 | 2024-08-27 | 佛山市顺德区美的电热电器制造有限公司 | Circuit for detecting heated device, electromagnetic heating apparatus and household appliance |
| CN110461193B (en) * | 2017-04-06 | 2021-05-18 | 三菱电机株式会社 | Electromagnetic induction heating cooker |
| TR201721881A2 (en) * | 2017-12-26 | 2019-07-22 | Arcelik As | A METAL DETECTION SYSTEM WITH COIL FEEDING WITH A HIGH FREQUENCY GENERATOR |
| CN109965670B (en) * | 2017-12-28 | 2021-08-31 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance, detection method and detection system of cooking appliance |
| CN109028181B (en) * | 2018-07-10 | 2020-02-07 | 孙宏斌 | Single-tube electromagnetic oven circuit and single-tube electromagnetic oven control method |
| CN112333864B (en) * | 2020-10-14 | 2022-06-14 | 中山爱它电器科技有限公司 | Control method and device for induction cooker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0295315A (en) * | 1988-09-30 | 1990-04-06 | Matsushita Electric Ind Co Ltd | Rice cooker |
| CN1163736A (en) * | 1996-03-26 | 1997-11-05 | 三菱电机株式会社 | Electric rice pot |
| JPH1156602A (en) * | 1997-08-22 | 1999-03-02 | Matsushita Electric Ind Co Ltd | Rice cooker |
| CN201021818Y (en) * | 2007-03-01 | 2008-02-13 | 东莞市前锋电子有限公司 | Circuit device for electromagnetic furnace detection boiler |
-
2009
- 2009-07-14 JP JP2009165643A patent/JP2011023163A/en active Pending
- 2009-11-06 CN CN200910207898.9A patent/CN101953626B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0295315A (en) * | 1988-09-30 | 1990-04-06 | Matsushita Electric Ind Co Ltd | Rice cooker |
| CN1163736A (en) * | 1996-03-26 | 1997-11-05 | 三菱电机株式会社 | Electric rice pot |
| JPH1156602A (en) * | 1997-08-22 | 1999-03-02 | Matsushita Electric Ind Co Ltd | Rice cooker |
| CN201021818Y (en) * | 2007-03-01 | 2008-02-13 | 东莞市前锋电子有限公司 | Circuit device for electromagnetic furnace detection boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101953626A (en) | 2011-01-26 |
| JP2011023163A (en) | 2011-02-03 |
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