CN210326998U - Induction cooker protection circuit and induction cooker - Google Patents
Induction cooker protection circuit and induction cooker Download PDFInfo
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- CN210326998U CN210326998U CN201921269514.1U CN201921269514U CN210326998U CN 210326998 U CN210326998 U CN 210326998U CN 201921269514 U CN201921269514 U CN 201921269514U CN 210326998 U CN210326998 U CN 210326998U
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- 238000010168 coupling process Methods 0.000 abstract description 6
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- 230000008054 signal transmission Effects 0.000 abstract description 3
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Abstract
The utility model discloses an electromagnetism stove protection circuit and electromagnetism stove, through setting up voltage surge protection module and electric current surge protection module, can play the effect of voltage surge protection and electric current surge protection simultaneously, and electric current surge protection module includes current signal input part, current signal output part, fourth resistance, third electric capacity, triode and fourth electric capacity, utilize the switching characteristic of triode, will pass through the surge signal input pin of second electric capacity coupling output pulse signal to main control chip, have signal transmission stability, low cost's advantage.
Description
Technical Field
The utility model belongs to the technical field of the household electrical appliances technique and specifically relates to an electromagnetism stove protection circuit and electromagnetism stove.
Background
The induction cooker is one of electric appliances commonly used in daily life, wherein, an Insulated Gate Bipolar Transistor (IGBT) is an important component of most induction cookers. In the use of electromagnetism stove, because the power grid environment can have unstable condition, can produce voltage surge phenomenon and electric current surge phenomenon, the condition that the IGBT damaged appears easily for the unable normal use of electromagnetism stove.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an object of the utility model is to provide an electromagnetism stove protection circuit and electromagnetism stove can effectively play the surge protection effect, improves the job stabilization nature of electromagnetism stove.
The utility model provides a technical scheme that its problem adopted is:
in a first aspect, an embodiment of the present invention provides an induction cooker protection circuit, including:
the main control chip is provided with a surge signal input pin;
the voltage surge protection module comprises a voltage signal input end and a voltage signal output end, wherein the voltage signal input end is connected with a power supply, and the voltage signal output end is connected with the surge signal input pin;
current surge protection module, including current signal input part, current signal output part, first resistance, first electric capacity, triode and second electric capacity, the coil of electromagnetism stove is connected to current signal input part, current signal output part connects surge signal input pin, first resistance is connected respectively current signal input part with the base of triode, first electric capacity connect in parallel in the both ends of first resistance, the collecting electrode of triode passes through the second electric capacity is connected current signal output part, the projecting pole ground connection of triode.
The protection circuit of the induction cooker at least has the following beneficial effects: through setting up voltage surge protection module and current surge protection module, can play the effect of voltage surge protection and current surge protection simultaneously to current surge protection module includes current signal input part, current signal output part, fourth resistance, third electric capacity, triode and fourth electric capacity, utilizes the switching characteristic of triode, will pass through the surge signal input pin of second capacitive coupling output pulse signal to main control chip, has signal transmission stability, low cost's advantage.
Further, voltage surge protection module still includes second resistance, third resistance, fourth resistance and third electric capacity, voltage signal input end, second resistance, third resistance and surge signal input pin establishes ties in proper order, the fourth resistance is connected respectively surge signal input pin and ground wire, the third electric capacity connect in parallel in the effect of step-down can be played through setting up second resistance and third resistance in the both ends of third resistance, avoids the condition that component damage appears, and voltage surge signal passes through third electric capacity coupling output, has simple structure, low cost's advantage.
Further, the voltage surge protection module further comprises a fourth capacitor, the fourth capacitor is respectively connected with the surge signal input pin and the ground wire, and the voltage surge signal can be filtered by the fourth capacitor, so that signal interference is reduced.
Further, the voltage surge protection module further comprises a diode, the negative electrode of the diode is connected with the power supply end, the positive electrode of the diode is connected with the surge signal input pin, and the surge signal input pin of the main control chip can be prevented from being broken down due to the fact that the voltage surge signal amplitude is too large through the diode.
Further, the current surge protection module still includes fifth resistance and sixth resistance, fifth resistance connect in between the base and the supply terminal of triode, sixth resistance connect in between second electric capacity and the supply terminal, through setting up fifth resistance and sixth resistance, can provide bias voltage, improve level driving ability.
In a second aspect, an embodiment of the present invention further provides an induction cooker, including the first aspect of the present invention.
The induction cooker has the advantage of high working stability because the protection circuit of the induction cooker is based on the same inventive concept.
Drawings
The invention is further described with reference to the following figures and examples.
Fig. 1 is a schematic block circuit diagram of a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a first embodiment of the present invention.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1-2, an embodiment of the present invention provides an induction cooker protection circuit, including a main control chip 100, a voltage surge protection module 200 and a current surge protection module 300, wherein the main control chip 100 is provided with a surge signal input pin, the voltage surge protection module 200 includes a voltage signal input end 210 and a voltage signal output end 220, the voltage signal input end 210 is connected to a power supply (i.e. a mains supply input end), the voltage signal output end 220 is connected to the surge signal input pin, the current surge protection module 300 includes a current signal input end 310, a current signal output end 320, a first resistor R14, a first capacitor C10, a triode Q6 and a second capacitor C23, the current signal input end 310 is connected to a coil of an induction cooker, the current signal output end 320 is connected to the surge signal input pin, the first resistor R14 is respectively connected to the current signal input end 310 and a base of the triode Q6, the first capacitor C10 is connected in parallel to two ends of the first resistor R14, the collector of the transistor Q6 is connected to the current signal output terminal 320 through the second capacitor C23, and the emitter of the transistor Q6 is grounded.
Preferably, the main control chip 100 may adopt a 45F0057 single chip microcomputer in the prior art, or other single chip microcomputers with similar functions, and the pin functions of the chip are described in detail in a data manual, which is not described herein again. The surge signal input pin is a fourth pin of the main control chip 100.
Specifically, the voltage surge protection module 200 further includes a second resistor R23, a third resistor R37, a fourth resistor R13, a third capacitor C16, a fourth capacitor C19 and a diode D5, the voltage signal input end 210, the second resistor R23, the third resistor R37 and the surge signal input pin are sequentially connected in series, the fourth resistor R13 is respectively connected to the surge signal input pin and the ground, the third capacitor C16 is connected in parallel to the two ends of the third resistor R37, the fourth capacitor C19 is respectively connected to the surge signal input pin and the ground, the negative electrode of the diode D5 is connected to the power supply terminal VCC, and the positive electrode of the diode D5 is connected to the surge signal input pin. Through setting up second resistance R23 and third resistance R37, can play the effect of step-down, avoid appearing the condition of component damage, voltage surge signal passes through third electric capacity C16 coupling output, has simple structure, low cost's advantage. By arranging the diode D5, the surge signal input pin of the main control chip 100 can be prevented from being broken down by the overlarge voltage surge signal amplitude. By arranging the fourth capacitor C19, the voltage surge signal can be filtered, and the signal interference can be reduced.
Further, current surge protection module 300 still includes fifth resistance R16 and sixth resistance R15, fifth resistance R16 connect in between triode Q6's the base and the supply terminal VCC, sixth resistance R15 connect in between second electric capacity C23 and the supply terminal VCC, through setting up fifth resistance R16 and sixth resistance R15, can provide bias voltage, improve the level driving ability.
Current surge protection principle: when a surge phenomenon occurs, a surge signal is input from the current signal input end 310, the surge signal enters the base electrode of the triode Q6 through the coupling of the first resistor R14 and the first capacitor C10, the switching characteristic of the triode Q6 is utilized, the pulse signal is coupled and output to the surge signal input pin of the main control chip 100 through the second capacitor C23, the main control chip 100 controls the IGBT to stop working until the surge signal disappears, and the main control chip 100 controls the IGBT to restart working, so that the IGBT is prevented from being broken down, and a current surge protection effect is achieved.
Voltage surge protection principle: when a surge phenomenon occurs, a surge signal is subjected to voltage reduction through the second resistor R23 and the third resistor R37, and is coupled with the third capacitor C16 and then is input to the surge signal input pin of the main control chip 100, the main control chip 100 controls the IGBT to stop working until the surge signal disappears, and the main control chip 100 controls the IGBT to restart working, so that the IGBT is prevented from being broken down, and a voltage surge protection effect is achieved. Preferably, when the fluctuation amplitude of the voltage surge signal is greater than 3V, the main control chip 100 controls the IGBT to stop working.
Through setting up voltage surge protection module 200 and current surge protection module 300, can play the effect of voltage surge protection and current surge protection simultaneously, and current surge protection module 300 includes current signal input part 310, current signal output part 320, fourth resistance R13, third electric capacity C16, triode Q6 and fourth electric capacity C19, utilize triode Q6's switching characteristic, will through the surge signal input pin of second electric capacity C23 coupling output pulse signal to main control chip 100, it is stable to have signal transmission, low cost's advantage.
Furthermore, the utility model discloses the second embodiment still provides an electromagnetism stove, including the electromagnetism stove protection circuit in the first embodiment, in addition, other circuit components and parts of this electromagnetism are unanimous with prior art, no longer describe herein. The induction cooker has the advantage of high working stability because the protection circuit of the induction cooker is based on the same inventive concept as the induction cooker in the first embodiment.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention defined by the appended claims.
Claims (6)
1. An induction cooker protection circuit, comprising:
the main control chip is provided with a surge signal input pin;
the voltage surge protection module comprises a voltage signal input end and a voltage signal output end, wherein the voltage signal input end is connected with a power supply, and the voltage signal output end is connected with the surge signal input pin;
current surge protection module, including current signal input part, current signal output part, first resistance, first electric capacity, triode and second electric capacity, the coil of electromagnetism stove is connected to current signal input part, current signal output part connects surge signal input pin, first resistance is connected respectively current signal input part with the base of triode, first electric capacity connect in parallel in the both ends of first resistance, the collecting electrode of triode passes through the second electric capacity is connected current signal output part, the projecting pole ground connection of triode.
2. The protection circuit of claim 1, wherein: the voltage surge protection module further comprises a second resistor, a third resistor, a fourth resistor and a third capacitor, wherein the voltage signal input end, the second resistor, the third resistor and the surge signal input pin are sequentially connected in series, the fourth resistor is respectively connected with the surge signal input pin and the ground wire, and the third capacitor is connected in parallel at two ends of the third resistor.
3. The protection circuit of claim 2, wherein: the voltage surge protection module further comprises a fourth capacitor, and the fourth capacitor is connected with the surge signal input pin and the ground wire respectively.
4. The protection circuit of claim 2, wherein: the voltage surge protection module further comprises a diode, the negative electrode of the diode is connected with the power supply end, and the positive electrode of the diode is connected with the surge signal input pin.
5. The protection circuit of claim 1, wherein: the current surge protection module further comprises a fifth resistor and a sixth resistor, the fifth resistor is connected between the base electrode and the power supply end of the triode, and the sixth resistor is connected between the second capacitor and the power supply end.
6. An induction cooker, characterized in that: the protection circuit of the induction cooker comprises the protection circuit of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921269514.1U CN210326998U (en) | 2019-08-06 | 2019-08-06 | Induction cooker protection circuit and induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921269514.1U CN210326998U (en) | 2019-08-06 | 2019-08-06 | Induction cooker protection circuit and induction cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210326998U true CN210326998U (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921269514.1U Active CN210326998U (en) | 2019-08-06 | 2019-08-06 | Induction cooker protection circuit and induction cooker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210326998U (en) |
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2019
- 2019-08-06 CN CN201921269514.1U patent/CN210326998U/en active Active
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