CN203504787U - Electromagnetic heating circuit and electric pressure cooker - Google Patents
Electromagnetic heating circuit and electric pressure cooker Download PDFInfo
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- CN203504787U CN203504787U CN201320572004.8U CN201320572004U CN203504787U CN 203504787 U CN203504787 U CN 203504787U CN 201320572004 U CN201320572004 U CN 201320572004U CN 203504787 U CN203504787 U CN 203504787U
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- control chip
- electromagnetic heating
- resistance
- heating module
- bridge rectifier
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Abstract
The utility model discloses an electromagnetic heating circuit and an electric pressure cooker. The electromagnetic heating circuit includes a bridge type rectification circuit which is used for carrying out rectification, an electromagnetic heating module which is in electrical connection with the bridge type rectification circuit, a control chip which is used for controlling the work of the electromagnetic heating module, a first resistor, a second resistor, and an impedance element whose resistance value is a preset value, wherein one terminal of the resistance element is connected with a negative output terminal of the bridge type rectification circuit, and the other terminal of the resistance element is connected with a grounding terminal of the control chip; a terminal of the first resistor is connected with a reverse direction input terminal of a reverse amplifier of the control chip, and the other terminal of the first resistor is connected with a negative output terminal of the bridge type rectification circuit; a terminal of the second resistor is connected with an output terminal of the reverse amplifier of the control chip, and the other terminal of the second resistor is connected with a reverse direction input terminal of the reverse amplifier of the control chip; and the control chip acquires current information of the electromagnetic heating module by analysis according to the voltage at the output terminal of the reverse amplifier, and controls work of the electromagnetic heating module according to current information.
Description
Technical field
The utility model relates to electromagnetic heating technique field, particularly a kind of electromagnetic heating circuit and electric pressure cooker.
Background technology
As everyone knows, along with the development of electromagnetic heating technique, Electromagnetic Heating product is widely used.In prior art, in Electromagnetic Heating product, be provided with electromagnetic heating module, for controlling the control chip of electromagnetic heating module work and for checking the current transformer of electromagnetic heating module electric current; The novel output of electric current that wherein control chip detects according to current transformer controls signal to electromagnetic heating module accordingly, to control electromagnetic heating module, is operated under constant power-mode.But because current transformer price is higher, thereby make circuit production cost higher.
Utility model content
Main purpose of the present utility model is to provide a kind of electromagnetic heating circuit, is intended to reduce circuit production cost.
To achieve these goals, the utility model provides a kind of electromagnetic heating circuit, comprise the bridge rectifier for carrying out rectification, the electromagnetic heating module being electrically connected to described bridge rectifier, for controlling the impedance component that control chip, the first resistance, the second resistance and the resistance value of described electromagnetic heating module work is preset value, wherein said impedor one end is connected with the negative output terminal of described bridge rectifier, and the other end is connected with the earth terminal of described control chip; One end of described the first resistance is connected with the inverting amplifier reverse input end of described control chip, and the other end is connected with the negative output terminal of described bridge rectifier; One end of described the second resistance is connected with the inverting amplifier output of described control chip, and the other end is connected with the inverting amplifier reverse input end of described control chip; Described control chip obtains the current information of electromagnetic heating module according to the voltage analysis of described inverting amplifier output, and according to described current information, controls the work of described electromagnetic heating module.
Preferably, described impedance component is constantan wire.
Preferably, described electromagnetic heating circuit also comprises the 3rd resistance, the 4th resistance, preset power supply, and wherein the 3rd one end of resistance and the negative output terminal of described bridge rectifier are connected, and the other end is connected with the positive pole of described preset power supply by the 4th resistance; The negative pole of described preset power supply is connected with the earth terminal of described control chip; Described the 3rd resistance is connected with the comparator negative input end that the public connecting end of the 4th resistance is also connected to described control chip; And when there is surge current in the positive output end of described bridge rectifier and the loop between negative output terminal, comparator in described control chip produces the interrupt trigger signal of a rising edge, and described control chip is controlled quitting work of described electromagnetic heating module according to described interrupt trigger signal.
The utility model also comprises a kind of electric pressure cooker, described electric pressure cooker comprises electromagnetic heating circuit, described electromagnetic heating circuit comprises the bridge rectifier for carrying out rectification, the electromagnetic heating module being electrically connected to described bridge rectifier, for controlling the impedance component that control chip, the first resistance, the second resistance and the resistance value of described electromagnetic heating module work is preset value, wherein said impedor one end is connected with the negative output terminal of described bridge rectifier, and the other end is connected with the earth terminal of described control chip; One end of described the first resistance is connected with the inverting amplifier reverse input end of described control chip, and the other end is connected with the negative output terminal of described bridge rectifier; One end of described the second resistance is connected with the inverting amplifier output of described control chip, and the other end is connected with the inverting amplifier reverse input end of described control chip; Described control chip obtains the current information of electromagnetic heating module according to the voltage analysis of described inverting amplifier output, and according to described current information, controls the work of described electromagnetic heating module.
Preferably, described impedance component is constantan wire.
Preferably, described electromagnetic heating circuit also comprises the 3rd resistance, the 4th resistance, preset power supply, and wherein the 3rd one end of resistance and the negative output terminal of described bridge rectifier are connected, and the other end is connected with the positive pole of described preset power supply by the 4th resistance; The negative pole of described preset power supply is connected with the earth terminal of described control chip; Described the 3rd resistance is connected with the comparator negative input end that the public connecting end of the 4th resistance is also connected to described control chip; And when there is surge current in the positive output end of described bridge rectifier and the loop between negative output terminal, comparator in described control chip produces the interrupt trigger signal of a rising edge, and described control chip is controlled quitting work of described electromagnetic heating module according to described interrupt trigger signal.
The utility model is connected between the negative output terminal of bridge rectifier and the earth terminal of control chip by an impedance component is set, thereby produce a specific pressure drop at impedance component two ends, and thereby this pressure drop is obtained to the amplification voltage that amplifies preset multiple by exporting the inverting amplifier reverse input end of control chip to, by control chip, according to the voltage analysis after amplifying, obtained the size of current of electromagnetic heating module, then according to this size of current, control the work of electromagnetic heating module.With respect to detect the electric current of electromagnetic heating module in prior art by current transformer, the utility model replaces current transformer by impedance component, therefore effectively reduces the production cost of circuit.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model electromagnetic heating circuit one embodiment.
The realization of the utility model object, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of electromagnetic heating circuit.
With reference to Fig. 1, Fig. 1 is the electrical block diagram of the utility model electromagnetic heating circuit one embodiment.The electromagnetic heating circuit that the present embodiment provides comprises the bridge rectifier 10 for carrying out rectification, the electromagnetic heating module 20 being electrically connected to described bridge rectifier 10, for controlling the impedance component 40 that control chip 30, the first resistance R 1, the second resistance R 2 and the resistance value of described electromagnetic heating module 20 work is preset value, one end of wherein said impedance component 40 is connected with the negative output terminal of described bridge rectifier 10, and the other end is connected with the earth terminal of described control chip 30; One end of described the first resistance R 1 is connected with the inverting amplifier reverse input end of described control chip 30, and the other end is connected with the negative output terminal of described bridge rectifier 10; One end of described the second resistance R 2 is connected with the inverting amplifier output of described control chip 30, and the other end is connected with the inverting amplifier reverse input end of described control chip 30; Described control chip 30 obtains the current information of electromagnetic heating module 20 according to the voltage analysis of described inverting amplifier output, and according to described current information, controls the work of described electromagnetic heating module 20.
In the present embodiment, the input of above-mentioned electromagnetic heating module 20 is connected with the positive output end of described bridge rectifier 10, and output is connected with the negative output terminal of bridge rectifier 10, and control end is connected with control chip 30.The preset value of above-mentioned impedance component 40 can arrange according to actual needs, and in the present embodiment, this impedance component 40 is preferably the constantan wire that resistance value is less.Control chip 30, for controlling Electromagnetic Heating special chip, is provided with inverting amplifier and comparator in this control chip 30, wherein above-mentioned inverting amplifier reverse input end is the 17th pin of control chip 30, and inverting amplifier output is the 16th pin of control chip 30.
During work, impedance component 40 two ends will produce the pressure drop of preset voltage, and in the present embodiment, the size of this preset voltage is about 50mv, and this pressure drop is a negative voltage for the earth terminal of control chip 30.And the pressure drop on this impedance component 40 will export the inverting amplifier reverse input end of control chip 30 to by the first resistance R 1, and after inverting amplifier amplifies, from the inverting amplifier output output of control chip 30.Control chip 30 analyzes by detecting the voltage of its inverting amplifier output the size that obtains electric current in electromagnetic heating module 20, and according to the size of this circuit, output control signals to electromagnetic heating module 20, so that the maintenance of the heating power of electromagnetic heating module 20 is constant.
It should be noted that the multiple that above-mentioned inverting amplifier amplifies can arrange according to actual needs, can adjust the multiple that on impedance component 40, pressure drop is amplified by adjusting the resistance of the first resistance R 1 and the second resistance R 2 particularly.
The utility model is connected between the negative output terminal of bridge rectifier 10 and the earth terminal of control chip 30 by an impedance component 40 is set, thereby produce a specific pressure drop at impedance component 40 two ends, and thereby this pressure drop is obtained to the amplification voltage that amplifies preset multiple by exporting the inverting amplifier reverse input end of control chip 30 to, by control chip 30, according to the voltage analysis after amplifying, obtained the size of current of electromagnetic heating module 20, then according to this size of current, control the work of electromagnetic heating module 20.With respect to detect the electric current of electromagnetic heating module 20 in prior art by current transformer, the utility model replaces current transformer by impedance component, therefore effectively reduces the production cost of circuit.
Further, based on above-described embodiment, in the present embodiment, above-mentioned electromagnetic heating circuit also comprises the 3rd resistance R 3, the 4th resistance R 4, preset power supply VCC, wherein one end of the 3rd resistance R 3 is connected with the negative output terminal of described bridge rectifier 10, and the other end is connected with the positive pole of described preset power supply VCC by the 4th resistance R 4; The negative pole of described preset power supply VCC is connected with the earth terminal of described control chip 30; Described the 3rd resistance R 3 is connected with the comparator negative input end (being the 14th pin of control chip 30) that the public connecting end of the 4th resistance R 4 is also connected to described control chip 30; And when there is surge current in the positive output end of described bridge rectifier 10 and the loop between negative output terminal, comparator in described control chip 30 produces the interrupt trigger signal of a rising edge, and described control chip 30 is controlled quitting work of described electromagnetic heating module 20 according to described interrupt trigger signal.
In the present embodiment, the positive output end of above-mentioned bridge rectifier 10 and the loop between negative output terminal are the current circuit to the negative output terminal of bridge rectifier 10, the i.e. current circuit of above-mentioned electromagnetic heating module 20 by the positive output end of bridge rectifier 10.The voltage swing of above-mentioned preset power supply VCC can arrange according to actual needs, and in the present embodiment, this preset power supply VCC can be the power supply of+5V.
When circuit normally connects, preset power supply VCC is by after the 4th resistance R 4, the 3rd resistance R 3 and impedance component 40 dividing potential drops, at the public connecting end of the 3rd resistance R 3 and the 4th resistance R 4, will produce the comparator reverse input end of a preset Voltage-output to control chip 30; Particularly the comparator of control chip 30 in the same way input be provided with a preset reference voltage and connect, this preset reference voltage is less than the voltage of the public connecting end of the 3rd resistance R 3 and the 4th resistance R 4.In the present embodiment, the public connecting end of the 3rd resistance R 3 and the 4th resistance R 4 is about 0.355V by the preset voltage producing, now the interior comparator output terminal of control chip 30 will be exported a low level, when there is surge current, the voltage of the public connecting end of the 3rd resistance R 3 and the 4th resistance R 4 will drop to below 0V, now the voltage of comparator output terminal will produce upset, obtain the interrupt trigger signal of a rising edge; Control chip 30 is controlled quitting work of described electromagnetic heating module 20 according to described interrupt trigger signal.Thereby can effectively prevent that surge current from damaging electromagnetic heating module 20, therefore extended the useful life of circuit.
The utility model also provides a kind of electric pressure cooker, and this electric pressure cooker comprises electromagnetic heating circuit, and the structure of this electromagnetic heating circuit can, with reference to above-described embodiment, not repeat them here.Naturally, because the electric pressure cooker of the present embodiment has adopted the technical scheme of above-mentioned electromagnetic heating circuit, so this electric pressure cooker has all beneficial effects of above-mentioned electromagnetic heating circuit.
These are only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (6)
1. an electromagnetic heating circuit, comprise the bridge rectifier for carrying out rectification, the electromagnetic heating module being electrically connected to described bridge rectifier, for controlling the control chip of described electromagnetic heating module work, it is characterized in that, described electromagnetic heating circuit also comprises the impedance component that the first resistance, the second resistance and resistance value are preset value, wherein said impedor one end is connected with the negative output terminal of described bridge rectifier, and the other end is connected with the earth terminal of described control chip; One end of described the first resistance is connected with the inverting amplifier reverse input end of described control chip, and the other end is connected with the negative output terminal of described bridge rectifier; One end of described the second resistance is connected with the inverting amplifier output of described control chip, and the other end is connected with the inverting amplifier reverse input end of described control chip; Described control chip obtains the current information of electromagnetic heating module according to the voltage analysis of described inverting amplifier output, and according to described current information, controls the work of described electromagnetic heating module.
2. electromagnetic heating circuit as claimed in claim 1, is characterized in that, described impedance component is constantan wire.
3. electromagnetic heating circuit as claimed in claim 2, it is characterized in that, described electromagnetic heating circuit also comprises the 3rd resistance, the 4th resistance, preset power supply, wherein the 3rd one end of resistance and the negative output terminal of described bridge rectifier are connected, and the other end is connected with the positive pole of described preset power supply by the 4th resistance; The negative pole of described preset power supply is connected with the earth terminal of described control chip; Described the 3rd resistance is connected with the comparator negative input end that the public connecting end of the 4th resistance is also connected to described control chip; And when there is surge current in the positive output end of described bridge rectifier and the loop between negative output terminal, comparator in described control chip produces the interrupt trigger signal of a rising edge, and described control chip is controlled quitting work of described electromagnetic heating module according to described interrupt trigger signal.
4. an electric pressure cooker, it is characterized in that, comprise electromagnetic heating circuit, described electromagnetic heating circuit comprises the bridge rectifier for carrying out rectification, the electromagnetic heating module being electrically connected to described bridge rectifier, for controlling the impedance component that control chip, the first resistance, the second resistance and the resistance value of described electromagnetic heating module work is preset value, wherein said impedor one end is connected with the negative output terminal of described bridge rectifier, and the other end is connected with the earth terminal of described control chip; One end of described the first resistance is connected with the inverting amplifier reverse input end of described control chip, and the other end is connected with the negative output terminal of described bridge rectifier; One end of described the second resistance is connected with the inverting amplifier output of described control chip, and the other end is connected with the inverting amplifier reverse input end of described control chip; Described control chip obtains the current information of electromagnetic heating module according to the voltage analysis of described inverting amplifier output, and according to described current information, controls the work of described electromagnetic heating module.
5. electric pressure cooker as claimed in claim 4, is characterized in that, described impedance component is constantan wire.
6. electric pressure cooker as claimed in claim 5, it is characterized in that, described electromagnetic heating circuit also comprises the 3rd resistance, the 4th resistance, preset power supply, wherein the 3rd one end of resistance and the negative output terminal of described bridge rectifier are connected, and the other end is connected with the positive pole of described preset power supply by the 4th resistance; The negative pole of described preset power supply is connected with the earth terminal of described control chip; Described the 3rd resistance is connected with the comparator negative input end that the public connecting end of the 4th resistance is also connected to described control chip; And when there is surge current in the positive output end of described bridge rectifier and the loop between negative output terminal, comparator in described control chip produces the interrupt trigger signal of a rising edge, and described control chip is controlled quitting work of described electromagnetic heating module according to described interrupt trigger signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320572004.8U CN203504787U (en) | 2013-09-13 | 2013-09-13 | Electromagnetic heating circuit and electric pressure cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320572004.8U CN203504787U (en) | 2013-09-13 | 2013-09-13 | Electromagnetic heating circuit and electric pressure cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203504787U true CN203504787U (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320572004.8U Expired - Lifetime CN203504787U (en) | 2013-09-13 | 2013-09-13 | Electromagnetic heating circuit and electric pressure cooker |
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| Country | Link |
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| CN (1) | CN203504787U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016077962A1 (en) * | 2014-11-17 | 2016-05-26 | 魏晓敏 | Electromagnetic electric apparatus and electromagnetic heating control circuit |
| CN113812853A (en) * | 2020-06-19 | 2021-12-21 | 九阳股份有限公司 | Heating control method for cooking appliance and cooking appliance |
| CN113812847A (en) * | 2020-06-19 | 2021-12-21 | 九阳股份有限公司 | Heating control method for cooking appliance and cooking appliance |
-
2013
- 2013-09-13 CN CN201320572004.8U patent/CN203504787U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016077962A1 (en) * | 2014-11-17 | 2016-05-26 | 魏晓敏 | Electromagnetic electric apparatus and electromagnetic heating control circuit |
| CN113812853A (en) * | 2020-06-19 | 2021-12-21 | 九阳股份有限公司 | Heating control method for cooking appliance and cooking appliance |
| CN113812847A (en) * | 2020-06-19 | 2021-12-21 | 九阳股份有限公司 | Heating control method for cooking appliance and cooking appliance |
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Granted publication date: 20140326 |