CN210381358U - Overheat protection circuit and induction cooker - Google Patents
Overheat protection circuit and induction cooker Download PDFInfo
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- CN210381358U CN210381358U CN201921191494.0U CN201921191494U CN210381358U CN 210381358 U CN210381358 U CN 210381358U CN 201921191494 U CN201921191494 U CN 201921191494U CN 210381358 U CN210381358 U CN 210381358U
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- 230000006698 induction Effects 0.000 title claims description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 14
- 238000013021 overheating Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 2
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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Abstract
The embodiment of the utility model provides an overheat protection circuit and electromagnetism stove, this overheat protection circuit includes: a microcontroller (10), a heating circuit (20), a thermistor NTC, a thermal fuse FU, an integrated circuit plug (30) and an integrated circuit socket (40), wherein the thermistor NTC and the thermal fuse FU are both connected with the integrated circuit plug (30); the microcontroller (10) and the heating circuit (20) are respectively connected with the integrated circuit socket (40), and the integrated circuit plug (30) is plugged with the integrated circuit socket (40). The utility model discloses fall the wiring of simplifying the circuit board, improve assembly efficiency.
Description
Technical Field
The embodiment of the utility model provides a relate to household electrical appliances technical field, especially relate to an overheat protection circuit and electromagnetism stove.
Background
The induction cooker is a common household appliance for heating, and when the induction cooker works, high-frequency alternating current is utilized to pass through the coil panel so as to enable the bottom of a pot placed on the induction cooker to generate eddy current, so that the pot arranged on the induction cooker is heated.
In order to avoid danger caused by overheating in the heating process of the induction cooker, in the prior art, a thermistor and a thermal fuse are arranged below a panel of the induction cooker to realize double protection measures. When the thermistor and the thermal fuse are connected to a circuit, in order to replace the thermistor and the thermal fuse, the thermistor and the thermal fuse are prepared into an integrated circuit plug which can be plugged with an integrated circuit socket on a circuit board, so that the installation and the replacement are realized in a plugging mode.
However, the thermistor and the thermal fuse correspond to one plug and one socket, respectively, and not only wiring of the circuit board is complicated, but also assembly efficiency is low.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an overheat protection circuit and electromagnetism stove to simplify the wiring of circuit board, improve assembly efficiency.
In a first aspect, the present invention provides an overheat protection circuit, including: microcontroller, heating circuit, thermistor NTC, thermal fuse FU, integrated circuit plug and integrated circuit socket, wherein
The thermistor NTC and the thermal fuse FU are both connected with the integrated circuit plug;
the microcontroller and the heating circuit are respectively connected with the integrated circuit socket, and the integrated circuit plug is plugged with the integrated circuit socket.
The overheat protection circuit provided by the embodiment comprises: microcontroller, heating circuit, thermistor NTC, thermal fuse FU, integrated circuit plug and integrated circuit socket, wherein, this thermistor NTC all with integrated circuit plug connection with thermal fuse FU, thereby this thermistor NTC shares an integrated circuit plug with thermal fuse FU, the quantity of integrated circuit plug has been saved on the one hand, the overall arrangement of circuit board has been simplified, on the other hand has improved assembly efficiency, this microcontroller and heating circuit are connected with the integrated circuit socket respectively, the integrated circuit plug is pegged graft with the integrated circuit socket, thereby realized that microcontroller stops the heating according to the temperature that thermistor detected, this heating circuit breaks off after thermal fuse FU fuses, thereby overheat protection has been realized.
In one possible design, a single pin formed by connecting one end of the thermistor NTC with one end of the thermal fuse FU corresponds to a first pin of the integrated circuit plug;
the other end of the thermal fuse FU corresponds to a second pin of the integrated circuit plug, and the other end of the thermistor NTC corresponds to a third pin of the integrated circuit plug;
after the integrated circuit plug is plugged into the integrated circuit socket, the first pin is grounded, the second pin is connected with the heating circuit, and the third pin is connected with the microcontroller.
One end through thermistor NTC is connected with the one end of thermal fuse FU to share a stitch, can reduce the volume of integrated circuit plug, reduce cost.
In one possible design, the integrated circuit plug is a three pin plug and the integrated circuit socket is a three hole socket.
When the integrated circuit plug is a three-pin plug, the integrated circuit socket is a three-hole socket, so that the integrated circuit plug is matched with the integrated circuit socket, and the integrated circuit plug and the integrated circuit socket can be rapidly and accurately plugged.
In one possible design, the overheating protection circuit further comprises an isolation circuit connected to the heating circuit and to the second pin corresponding to the thermal fuse FU, respectively;
the isolation circuit is used to isolate the interference of the thermal fuse FU when the heating circuit is in operation.
The isolation circuit can isolate the interference of the thermal fuse FU on the IGBT drive circuit, and can force the induction cooker to stop working when the thermal fuse is fused.
In one possible design, the isolation circuit includes a unidirectional conducting circuit for opening when the heating circuit is in operation to isolate the thermal fuse FU from interference.
In one possible design, the unidirectional conducting circuit includes an NPN-type transistor Q4, a base of the transistor Q4 is connected to the corresponding second pin of the thermal fuse FU and the power supply terminal, a collector of the transistor Q4 is connected to the heating circuit, and an emitter of the transistor Q4 is grounded.
Include triode Q4 through this one-way conduction circuit, through triode Q4's off-state, realized keeping apart thermal fuse FU to IGBT drive circuit's interference, through triode Q4's saturation state, the voltage of control IGBT drive circuit when having realized thermal fuse FU fusing is 0, simple structure, and required components and parts are few, and are with low costs.
In one possible design, the overheat protection circuit further includes a voltage dividing resistor R28, and the voltage dividing resistor R28 is connected to the third pin corresponding to the thermistor NTC and the microcontroller, respectively.
In one possible design, the heating circuit includes an IGBT drive circuit and an IGBT, the IGBT drive circuit being connected to the IGBT, and the overheat protection circuit further includes: and the voltage conversion circuit is respectively connected with the microcontroller and the IGBT driving circuit and is used for providing working voltage for the IGBT driving circuit or disconnecting the IGBT driving circuit.
The voltage conversion circuit can provide proper driving voltage for the IGBT driving circuit under the control of the microcontroller, so that the IGBT driving circuit drives the IGBT to be switched on or switched off, and can output low level under the control of the microcontroller, so that the IGBT driving circuit stops working.
In one possible design, the voltage conversion circuit includes an NPN-type transistor Q2, a base of the transistor Q2 is connected to the microcontroller and the power supply terminal, a collector of the transistor Q2 is connected to the power supply terminal through a pull-up resistor R9, a collector of the transistor Q2 is further connected to the IGBT driving circuit, and an emitter of the transistor Q2 is grounded.
Through the voltage reverse phase effect of triode Q2, on the one hand can provide suitable operating voltage for IGBT drive circuit, and on the other hand can control this IGBT drive circuit stop work, and circuit structure is simple, easily realizes.
In a second aspect, the present invention further provides an induction cooker, wherein the induction cooker comprises the circuit according to the first aspect or various possible designs of the first aspect.
The electromagnetism stove that this embodiment provided, this thermistor NTC and thermal fuse FU all with integrated circuit plug connection, thereby this thermistor NTC and thermal fuse FU share an integrated circuit plug, the quantity of integrated circuit plug has been saved on the one hand, the overall arrangement of circuit board has been simplified, on the other hand has improved the assembly efficiency of electromagnetism stove, this microcontroller and heating circuit are connected with the integrated circuit socket respectively, the integrated circuit plug is pegged graft with the integrated circuit socket, thereby realized that microcontroller stops the electromagnetism stove heating according to the temperature that thermistor detected, this heating circuit breaks off behind thermal fuse FU, thereby realized the overheat protection to the electromagnetism stove.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a first schematic diagram of an overheat protection circuit provided by the present invention;
fig. 2 is a schematic diagram of an ic plug provided by the present invention;
fig. 3 is a second schematic diagram of the overheat protection circuit provided by the present invention.
Description of reference numerals:
10-a microcontroller;
20-a heating circuit;
30-an integrated circuit plug;
40-an integrated circuit socket;
50-an isolation circuit;
60-voltage conversion circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of the overheat protection circuit provided by the present invention. As shown in FIG. 1, the overheat protection circuit includes a microcontroller 10, a heating circuit 20, a thermistor NTC, a thermal fuse FU, an integrated circuit plug 30, and an integrated circuit socket 40, wherein
Both the thermistor NTC and the Thermal Fuse (FU for short) are connected to the integrated circuit plug 30;
the microcontroller 10 and the heating circuit 20 are respectively connected with an integrated circuit socket 40, and the integrated circuit plug 30 is plugged with the integrated circuit socket 40.
The overheat protection circuit provided by the embodiment can be applied to various heatable household appliances, such as an induction cooker, an electric fryer, and the like, and the embodiment does not particularly limit the types of the household appliances. In this embodiment, for convenience of description, an electromagnetic oven is taken as an example for detailed description, and other household appliances are similar, and this embodiment is not described herein again.
The thermistor NTC is used to detect the temperature, for example, the temperature of the pot transmitted through the panel of the induction cooker, and when the detected temperature is higher than a preset threshold, the microcontroller 10 generates a protection action to stop heating. The thermistor 20 is a kind of sensitive element, and the thermistor is sensitive to temperature, and shows different resistance values at different temperatures. Therefore, the temperature detected by the thermistor can be acquired based on the voltage division of the thermistor or the like.
The thermal fuse FU is also called a thermal fuse, and is a non-resettable disposable thermal protection device, and is connected in series to a device line, and is fused to cut off the heating circuit 20 when the device is abnormally operated to cause a temperature rise to a fusing temperature. The thermal fuse FU is generally made of a low melting point alloy type material.
The integrated circuit plug 30 and the integrated circuit socket 40 are plugs and sockets used in an integrated circuit, which can realize circuit connection. Through plug and socket connection, can realize detachable circuit connection.
In this embodiment, thermistor NTC and thermal fuse FU share an integrated circuit plug 30, which integrated circuit plug 30 is adapted to mate with an integrated circuit socket 40. The thermistor NTC and the thermal fuse FU share one integrated circuit plug 30, so that the number of integrated circuit plugs is reduced, the layout of the circuit board is simplified, and the assembly efficiency is improved.
The ic plug 30 may be a multi-pin plug, for example, a four-pin plug, two pins being used at both ends of the thermistor NTC, and two pins being used at both ends of the thermal fuse FU. The ic plug 30 may also be a three-pin plug, in which one end of the thermistor NTC and one end of the thermal fuse FU share a pin, as shown in fig. 2.
Fig. 2 is a schematic diagram of the ic plug according to the present invention, and as shown in fig. 2, a single-wire end formed after one end of the thermistor NTC is connected to one end of the thermal fuse FU corresponds to the first pin 1 of the ic plug 30; the other end of the thermal fuse FU corresponds to the second pin 2 of the integrated circuit plug 30 and the other end of the thermistor NTC corresponds to the third pin 3 of the integrated circuit plug 30.
One end through thermistor NTC is connected with the one end of thermal fuse FU to share a stitch, can reduce the volume of integrated circuit plug, reduce cost.
When the ic plug 30 is a three-pin plug, the ic socket 40 is a three-hole socket, so as to complete the matching between the ic plug 30 and the ic socket 40, and ensure the ic plug 30 and the ic socket 40 can be quickly and accurately plugged.
It will be understood by those skilled in the art that the integrated circuit plug 30 may also be a plug with more than three pins, but the thermistor NTC and the thermal fuse FU use only three pins of the integrated circuit plug 30, and other pins may be used by other devices, and the function of the other pins is not particularly limited by the present embodiment.
The overheat protection circuit provided by the embodiment comprises: microcontroller, heating circuit, thermistor NTC, thermal fuse FU, integrated circuit plug and integrated circuit socket, wherein, this thermistor NTC all with integrated circuit plug connection with thermal fuse FU, thereby this thermistor NTC shares an integrated circuit plug with thermal fuse FU, the quantity of integrated circuit plug has been saved on the one hand, the overall arrangement of circuit board has been simplified, on the other hand has improved assembly efficiency, this microcontroller and heating circuit are connected with the integrated circuit socket respectively, the integrated circuit plug is pegged graft with the integrated circuit socket, thereby realized that microcontroller stops the heating according to the temperature that thermistor detected, this heating circuit breaks off after thermal fuse FU fuses, thereby overheat protection has been realized.
Fig. 3 is a second schematic diagram of the overheat protection circuit provided by the present invention, as shown in fig. 3, the heating circuit 20 is illustrated as an electromagnetic heating circuit in this embodiment, and the electromagnetic heating circuit includes an Insulated Gate Bipolar Transistor (IGBT) driving circuit and an IGBT.
Specifically, the working circuit of the induction cooker mainly comprises a resonant circuit, an IGBT driving circuit, an IGBT and a microcontroller. The IGBT driving circuit is respectively connected with the microcontroller and the IGBT, and the IGBT is also connected with the resonance circuit.
During operation, microcontroller can control IGBT drive circuit's work to provide IGBT and switch on starting point and driving voltage, make resonant circuit produce resonant current, thereby resonant circuit's coil panel produces periodic variation's magnetic field, thereby heats the pan.
As shown in fig. 3, after the integrated circuit plug 30 is plugged into the integrated circuit socket 40, the first pin 1 is grounded, the second pin 2 is connected to the IGBT driving circuit, and the third pin 3 is connected to the microcontroller 10. The three pins of the ic plug 30 are connected to the three holes of the ic socket 40, respectively.
The grounding of the first pin 1 in this embodiment means that after the first pin 1 is inserted into the first hole 1, the first pin 1 is grounded through the first hole 1, and the second pin 2 and the third pin 3 are similar, which is not described herein again.
The second pin 2 is connected to an IGBT driving circuit, that is, the thermal fuse FU is connected to the IGBT driving circuit, and when the thermal fuse 20 is blown, the driving voltage of the IGBT driving circuit is zero, so that the induction cooker stops operating.
In this embodiment, when the electromagnetic oven is in operation, the thermal fuse FU interferes with the IGBT driving circuit, and in order to avoid this interference, the overheat protection circuit further includes an isolation circuit 50, and the isolation circuit 50 is connected to the second pins corresponding to the IGBT driving circuit and the thermal fuse FU, respectively, and when the heating circuit 20 is in operation, the isolation circuit 20 can isolate the interference of the thermal fuse FU.
The isolation circuit 20 may be any type of circuit, and the embodiment is not limited herein as long as it can isolate the interference of the thermal fuse FU with the IGBT driving circuit and can force the induction cooker to stop working when the thermal fuse is blown.
In one possible implementation, the isolation circuit 50 comprises a unidirectional conduction circuit that is in an open state when the heating circuit 20 is in operation to isolate the thermal fuse FU from interference.
The unidirectional conducting circuit can be turned off when the heating circuit 20 is operated, and when the thermal fuse FU is fused, the drive voltage of the IGBT drive circuit is set to 0, and the IGBT drive circuit stops operating.
For example, the unidirectional one-way circuit includes an NPN-type transistor Q4, a base of the transistor Q4 is connected to the second pin and the power supply terminal corresponding to the thermal fuse FU, a collector of the transistor Q4 is connected to the IGBT driving circuit, and an emitter of the transistor Q4 is grounded.
The resistance value of the thermal fuse FU is very small, generally 2-6 milliohms, when the electromagnetic oven works normally, the resistance of the thermal fuse FU can be almost ignored, the base electrode of the triode Q4 is equivalent to ground, the triode Q4 is short-circuited, the triode Q4 is in a cut-off state, and the IGBT driving circuit can work normally under the control of the microcontroller.
Due to transistor Q4, the lead of thermal fuse FU is isolated from interfering with the IGBT drive circuit when transistor Q4 is turned off.
When the thermal fuse FU is fused at high temperature, the triode Q4 is not short-circuited any more, the base electrode of the triode Q4 is connected with the power supply end VDD1, voltage can be obtained from the power supply end VDD1, the triode Q4 is saturated, and the collector electrode of the triode Q4 pulls down the voltage input by the IGBT driving circuit, so that the electromagnetic oven is forced to stop working.
Include triode Q4 through this one-way conduction circuit, through triode Q4's off-state, realized keeping apart thermal fuse FU to IGBT drive circuit's interference, through triode Q4's saturation state, the voltage of control IGBT drive circuit when having realized thermal fuse FU fusing is 0, simple structure, and required components and parts are few, and are with low costs.
The unidirectional circuit may further include a resistor R17, wherein one end of the resistor R17 is connected to a power supply terminal, and the other end is connected to the base of the transistor Q4 and the thermal fuse FU, respectively. This resistance R17 plays the effect of load when thermal fuse FU does not fuse for triode Q4 is by the short circuit, after this thermal fuse FU fuses, plays the effect of current-limiting, avoids the too big triode Q4 of causing the damage of power end electric current.
As shown in fig. 3, the overheat protection circuit of the present embodiment further includes a voltage dividing resistor R28, and the voltage dividing resistor R28 is respectively connected to the third pin corresponding to the thermistor NTC and the microcontroller 10.
The resistance value of the thermistor NTC can be obtained through reverse estimation through the divider resistor R28, and the current temperature can be obtained according to the corresponding relation between the resistance value of the thermistor NTC and the temperature. For example, VNTC＝VCC/(R28+RNTC)*RNTCWherein V isNTCIs heat-sensitiveThe voltage divided by the resistor, VCC being the input voltage, VNTCCan be obtained by a microcontroller, for example by means of analog-to-digital conversion (AD), the values of VCC and R28 being known, so that the thermistor R can be obtained by back-steppingNTCThe resistance value of (c).
The overheat protection circuit may further include a capacitor C25, one end of the capacitor C25 being connected to the microcontroller and the other end being connected to the first pin of the ic jack 30 and to ground. The capacitor C25 can filter the input power.
As shown in fig. 3, the overheat protection circuit further includes a voltage conversion circuit 60, the voltage conversion circuit 60 is respectively connected to the microcontroller 10 and the IGBT driving circuit, and the voltage conversion circuit 60 is configured to provide an operating voltage to the IGBT driving circuit or turn off the IGBT driving circuit.
The voltage conversion circuit 60 can provide a suitable driving voltage to the IGBT driving circuit under the control of the microcontroller 10, so that the IGBT driving circuit drives the IGBT to be turned on or off, and can output a low level under the control of the microcontroller, so that the IGBT driving circuit stops operating.
In the present embodiment, the voltage converting circuit 60 includes an NPN-type transistor Q2, a base of the transistor Q2 is connected to the microcontroller 10 and the power supply terminal, a collector of the transistor Q2 is connected to the power supply terminal through a pull-up resistor R9, a collector of the transistor Q2 is further connected to the IGBT driving circuit, and an emitter of the transistor Q2 is grounded.
In this embodiment, the transistor Q2 has the function of voltage inversion. The microcontroller may input a Pulse signal to the voltage conversion circuit 60 through a Pulse Program Generator (PPG).
When the microcontroller inputs a low level to the transistor Q2, the transistor Q2 is turned off, the transistor Q2 is connected to a power supply terminal through the pull-up resistor R9, and the collector of the transistor Q2 outputs a high level to supply a voltage to the IGBT driving circuit, which may reach the operating voltage of the IGBT driving circuit. When the microcontroller inputs a high level to transistor Q2, transistor Q2 saturates and the collector of transistor Q2 pulls the voltage input to the IGBT driver circuit low, so that the collector of transistor Q2 outputs a low level and the IGBT driver circuit stops operating. The operating voltage of the microcontroller is 5V, and the operating voltage of 18V can be output to the IGBT drive circuit by the voltage inversion action of the transistor Q2.
The voltage conversion circuit 60 further comprises a voltage dividing resistor R8 and a voltage dividing resistor R34, wherein the voltage dividing resistor R8 and the voltage dividing resistor R34 can divide the voltage of the base of the transistor Q2, so that the transistor Q2 is prevented from being damaged by overlarge voltage.
According to the IGBT driving circuit, due to the voltage inversion action of the triode Q2, on one hand, a proper working voltage can be provided for the IGBT driving circuit, on the other hand, the IGBT driving circuit can be controlled to stop working, the circuit structure is simple, and the realization is easy.
The embodiment further provides an overheat protection device, which comprises a thermistor NTC, a thermal fuse FU and an integrated circuit plug, wherein the thermistor NTC and the thermal fuse FU are both connected with the integrated circuit plug.
Wherein, a single wire end formed after one end of the thermistor NTC is connected with one end of the thermal fuse FU corresponds to the first pin of the integrated circuit plug;
the other end of the thermal fuse FU corresponds to the second pin of the integrated circuit plug, and the other end of the thermistor NTC corresponds to the third pin of the integrated circuit plug. The integrated circuit plug is a 3-pin plug.
The utility model also provides an electromagnetism stove, this electromagnetism stove includes as above figure 1 to the overheated protective circuit that figure 3 shows.
The electromagnetism stove that this embodiment provided, this thermistor NTC and thermal fuse FU all with integrated circuit plug connection, thereby this thermistor NTC and thermal fuse FU share an integrated circuit plug, the quantity of integrated circuit plug has been saved on the one hand, the overall arrangement of circuit board has been simplified, on the other hand has improved the assembly efficiency of electromagnetism stove, this microcontroller and heating circuit are connected with the integrated circuit socket respectively, the integrated circuit plug is pegged graft with the integrated circuit socket, thereby realized that microcontroller stops the electromagnetism stove heating according to the temperature that thermistor detected, this heating circuit breaks off behind thermal fuse FU, thereby realized the overheat protection to the electromagnetism stove.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and not to limit the same; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (10)
1. An overheat protection circuit, comprising: a microcontroller (10), a heating circuit (20), a thermistor NTC, a thermal fuse FU, an integrated circuit plug (30) and an integrated circuit socket (40), wherein
The thermistor NTC and the thermal fuse FU are both connected with the integrated circuit plug (30);
the microcontroller (10) and the heating circuit (20) are respectively connected with the integrated circuit socket (40), and the integrated circuit plug (30) is plugged with the integrated circuit socket (40).
2. A circuit according to claim 1, characterized in that the single end formed by the connection of one end of said thermistor NTC with one end of said thermal fuse FU corresponds to the first pin of said integrated circuit plug (30);
the other end of the thermal fuse FU corresponds to a second pin of the integrated circuit plug (30), and the other end of the thermistor NTC corresponds to a third pin of the integrated circuit plug (30);
after the integrated circuit plug (30) is plugged into the integrated circuit socket (40), the first pin is grounded, the second pin is connected with the heating circuit (20), and the third pin is connected with the microcontroller (10).
3. A circuit according to claim 2, characterized in that the integrated circuit plug (30) is a three pin plug and the integrated circuit socket (40) is a three hole socket.
4. The circuit according to claim 2, wherein the overheating protection circuit further comprises an isolation circuit (50), the isolation circuit (50) being connected to the heating circuit (20) and to the corresponding second pin of the thermal fuse FU, respectively;
the isolation circuit (50) is used to isolate the thermal fuse FU from interference when the heating circuit (20) is in operation.
5. The circuit according to claim 4, wherein the isolation circuit (50) comprises a unidirectional conducting circuit for opening when the heating circuit (20) is in operation to isolate the thermal fuse FU from interference.
6. The circuit according to claim 5, wherein the unidirectional circuit comprises an NPN transistor Q4, wherein the base of the transistor Q4 is connected to the corresponding second pin of the thermal fuse FU and the power supply terminal, respectively, the collector of the transistor Q4 is connected to the heating circuit (20), and the emitter of the transistor Q4 is connected to ground.
7. The circuit of claim 2, wherein the overheat protection circuit further comprises a voltage dividing resistor R28, and the voltage dividing resistor R28 is connected to the corresponding third pin of the thermistor NTC and the microcontroller (10), respectively.
8. The circuit of claim 1, wherein the heating circuit (20) comprises an IGBT drive circuit and an IGBT, the IGBT drive circuit being connected to the IGBT, the overheat protection circuit further comprising: the voltage conversion circuit (60), the voltage conversion circuit (60) is respectively connected with the microcontroller (10) and the IGBT drive circuit, and the voltage conversion circuit (60) is used for providing working voltage for the IGBT drive circuit or disconnecting the IGBT drive circuit.
9. The circuit of claim 8, wherein the voltage conversion circuit (60) comprises an NPN-type transistor Q2, wherein a base of the transistor Q2 is connected to the microcontroller (10) and a power supply terminal, respectively, a collector of the transistor Q2 is connected to the power supply terminal through a pull-up resistor R9, a collector of the transistor Q2 is further connected to the IGBT driver circuit, and an emitter of the transistor Q2 is connected to ground.
10. An induction hob, characterized in, that the induction hob comprises a circuit according to any one of the claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921191494.0U CN210381358U (en) | 2019-07-26 | 2019-07-26 | Overheat protection circuit and induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921191494.0U CN210381358U (en) | 2019-07-26 | 2019-07-26 | Overheat protection circuit and induction cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210381358U true CN210381358U (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921191494.0U Active CN210381358U (en) | 2019-07-26 | 2019-07-26 | Overheat protection circuit and induction cooker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210381358U (en) |
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2019
- 2019-07-26 CN CN201921191494.0U patent/CN210381358U/en active Active
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