CN212845849U - Detection circuit and electromagnetic heating equipment - Google Patents

Abstract

The utility model provides a detection circuitry and electromagnetic heating equipment, this detection circuitry including set up at least one detection device on the electromagnetic heating equipment drain pan, with the short circuit detection circuitry that at least one detection device is connected and with the control circuit that short circuit detection circuitry connects. The detection device comprises at least two detection terminals, the detection device is switched on when the at least two detection terminals are contacted with the metal table board, and the detection device is switched off when the at least two detection terminals leave the metal table board. The short circuit detection circuit detects the connection or disconnection of the detection device and sends the detection result of the connection or disconnection of the detection device to the control circuit, and the control circuit executes preset control operation according to the detection result. The detection circuit realizes the detection of the metal table board, and the detection circuit and the detection device have simple structures and lower cost.

Description

Detection circuit and electromagnetic heating equipment

Technical Field

The utility model relates to a circuit technology especially relates to a detection circuitry and electromagnetic heating equipment.

Background

Electromagnetic heating equipment, such as electromagnetism stove or electromagnetism kitchen, is the device that utilizes electromagnetic induction phenomenon to convert electric energy into heat energy, along with the progress of technique, the continuous improvement of components and parts quality, electromagnetic heating equipment's application is also more and more popularized.

When the table top is made of metal, the electromagnetic heating equipment can heat the table top, the table top with the raised temperature is damaged in turn, and potential safety hazards are brought to personnel nearby the electromagnetic heating equipment. Therefore, the potential safety hazard can be solved by detecting the material of the table board. However, the existing device for detecting the material of the table top has a complex structure and high cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides a detection circuitry and electromagnetic heating equipment to whether the realization is the detection of metal material mesa to electromagnetic heating equipment place mesa, improved electromagnetic heating equipment's security and life, reduce the device structure complexity and the hardware cost that detect the metal material mesa.

In a first aspect, the present invention provides a detection circuit for an electromagnetic heating apparatus, the detection circuit includes at least one detection device disposed on a bottom casing of the electromagnetic heating apparatus, a short circuit detection circuit connected to the at least one detection device, and a control circuit connected to the short circuit detection circuit;

the at least one detection device comprises at least two detection terminals, the at least two detection terminals are arranged at the bottom of the bottom shell, the detection device is switched on when the at least two detection terminals are in contact with the metal table board, and the detection device is switched off when the at least two detection terminals are separated from the metal table board;

the short circuit detection circuit detects the connection or disconnection of the detection device and sends the detection result of the connection or disconnection of the detection device to the control circuit;

and the control circuit executes preset control operation according to the detection result.

The utility model discloses well detection device is located the bottom of electromagnetism stove firing equipment drain pan, and electromagnetism stove firing equipment places when the mesa, and two at least detection terminals and the mesa contact of detection device switch on each other between two at least detection terminals when the mesa is the metal material mesa, and detection device switches on, does not switch on between two at least detection terminals when the mesa is the non-metal material mesa. The short circuit detection circuit connected with the detection device is used for detecting the connection or disconnection of the detection device and feeding back the connection or disconnection of the detection device to the control circuit of the electromagnetic heating equipment, and the control circuit can perform corresponding control operation according to the connection or disconnection of the detection device so as to improve the safety of the electromagnetic heating equipment and prolong the service life of the induction cooker. The utility model provides a detection circuitry utilizes the electric conductivity of metal to realize the detection of metal material mesa, and detection device only needs to include two at least detection terminals that have electric conductivity, and short-circuit detection circuitry only needs to detect whether detection device switches on to send corresponding level signal to control circuit, it is visible that detection circuitry including detection device and short-circuit detection circuitry simple structure, cost are lower.

In a possible implementation manner, the control circuit is connected with a working circuit of the electromagnetic heating device and/or an alarm device, and the control circuit controls the driving of the working circuit and/or controls the alarm operation of the alarm device according to the detection result.

The utility model discloses in, control circuit controls work circuit work or stop work according to detection device's switching on or disconnection, realizes controlling the electromagnetic heating equipment heating when the mesa is non-metallic material mesa, controls the electromagnetic heating equipment stop heating when the mesa is the metal mesa. And/or the control circuit controls the alarm device to give an alarm according to the connection or disconnection of the detection device, so that the alarm device is controlled to give an alarm when the table top is made of metal so as to remind a user. Therefore, the safety of the electromagnetic heating equipment is further improved by the detection circuit and the control circuit which are combined with the working circuit and/or the alarm device.

In a possible implementation manner, the at least two detection terminals of the at least one detection device are disposed on supporting legs at the bottom of the bottom shell of the electromagnetic heating apparatus.

The utility model discloses in, electromagnetic heating equipment's drain pan bottom can set up the supporting legs. At least two detection terminals of at least one detection device are arranged on the supporting legs, so that when the electromagnetic heating equipment is placed on the table board, the detection terminals of the detection device are abutted to the table board, and the contact effect of the detection terminals and the table board is improved.

In a possible implementation manner, at least two detection terminals of the same detection device are arranged on the same supporting leg.

The utility model discloses a set up same two at least detection terminal with same detection device on the supporting legs, when supporting legs and metal material mesa contact, the detection device who is located on this supporting legs switches on, and needn't a plurality of supporting legs all make detection device switch on with the contact of metal material mesa, improved the accuracy that the metal material mesa detected.

In a possible implementation manner, a vacant cavity communicated with the outside of the electromagnetic heating device and the inner cavity is formed in the supporting leg, the detection terminal comprises a detection screw and a lead, the head of the detection screw is located on the outside of the supporting leg, a screw rod of the detection screw is located in the vacant cavity, one side of the lead is connected with the screw rod, and the other side of the lead is connected with the short circuit detection circuit.

The utility model discloses in, detection device's detection terminal is including detecting screw and wire, and simple structure, cost are lower. The head of the detection screw is arranged outside the supporting leg, and the screw rod is arranged in a vacant cavity of the supporting leg, so that the detection terminal is abutted to the table board more tightly, the metal material detection accuracy of the table board is improved, and meanwhile, the occupied space of the detection device in the inner cavity of the electromagnetic heating equipment is saved.

In a possible implementation manner, the screw rod is provided with a wiring terminal, and the wiring terminal is used for fixing one side of the wire on the screw rod.

The utility model discloses in, fix wire one side on the screw rod through binding post, improve the wire and detect the screw rod of screw connection stability, and then improve the connection stability between detection device and the short circuit detection circuitry.

In a possible implementation manner, the detection terminal further includes a nut, and the detection terminal is fixed on the supporting leg through the nut and the detection screw.

The utility model discloses in, through the cooperation of nut and detection screw, will detect the terminal and fix on the supporting legs, improve the installation stability of detection terminal on the supporting legs.

In a possible implementation manner, the short-circuit detection circuit includes a first loop and a second loop, the first loop is connected with the detection device, and the second loop is connected with the control circuit; when the detection device is conducted, the first loop controls the conduction of the second loop, and the second loop outputs a first level signal to the control circuit; when the detection device is disconnected, the first loop is disconnected and controls the second loop to be disconnected, and the second loop outputs a second level signal to the control circuit.

The utility model discloses in, in short circuit detection circuitry, realize the detection whether to switch on detection device through first return circuit, through the control of first return circuit to the switching on of second return circuit, short circuit detection circuitry realizes sending corresponding level signal to control circuit according to detection device's the condition of switching on, and the output of second return circuit and the circuit state of second return circuit can not influence first return circuit, effectively improved short circuit detection circuitry's interference killing feature and stability, and then improve the accuracy that the metal material mesa detected.

In a possible implementation manner, the first loop includes a light emitting device, the second loop includes a light sensing switch, and the first loop controls the light sensing switch to be turned on or off through the light emitting device.

The utility model discloses in, switch on or break off through illuminator control photoinduction switch, realize the control that first return circuit switched on or breaks off to the second return circuit.

In a possible implementation manner, the first loop further includes a first line interface and a second line interface, and the at least two detection terminals are connected to the first loop through the first line interface and the second line interface;

one pole of the light-emitting device is connected with a power supply, the other pole of the light-emitting device is connected with the first line interface, and the second line interface is grounded.

The utility model discloses in, a power is connected to illuminator's one utmost point, and another utmost point passes through first circuit interface connection detection terminal, and at least two detection terminals insert first circuit through first circuit interface and second circuit interface respectively, and second circuit interface ground connection simultaneously realizes illuminator and detection device's series connection consequently, and illuminator switches on when detection device switches on, and illuminator disconnection when detection device disconnects realizes the detection that first circuit switched on or breaks off to detection device.

In a possible implementation manner, one pole of the light sensing switch is connected to the control circuit and grounded through a first resistor, and the other pole of the light sensing switch is connected to a power supply through a second resistor.

The utility model discloses in, first resistance and second resistance play the partial pressure effect to protection photoinduction switch.

In a second aspect, the present invention provides an electromagnetic heating apparatus, wherein the electromagnetic heating apparatus comprises a bottom casing having an inner cavity and a cover arranged on the bottom casing, a circuit board is arranged in the inner cavity, and a detection circuit is arranged on the circuit board according to the first aspect.

The utility model provides a detection circuitry and electromagnetic heating equipment, through detection device and short circuit detection circuitry among the detection circuitry, whether the mesa that detects electromagnetic heating equipment place is the metal material mesa, detection circuitry sends electromagnetic heating equipment's control circuit with the testing result, control circuit carries out predetermined control operation to not only realize the detection of electromagnetic heating equipment place metal material mesa, the security and the life of electromagnetic heating equipment have been improved, and detection circuitry simple structure, the cost is lower moreover.

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 a detection circuit provided by the present invention;

fig. 2 is a schematic diagram of a detection circuit according to the present invention;

fig. 3 is a third schematic diagram of a detection circuit provided by the present invention;

fig. 4 is a schematic view of an internal structure of a bottom case of an electromagnetic heating apparatus provided by the present invention;

fig. 5 is an enlarged schematic view of the structure of the detection terminal inside the support leg provided by the present invention;

fig. 6 is an enlarged schematic view of the structure of the detection terminal inside the support leg provided by the present invention;

fig. 7 is a schematic view of the outside of the support leg provided by the present invention;

fig. 8 is a fourth schematic diagram of a detection circuit provided by the present invention;

fig. 9 is a fifth schematic diagram of a detection circuit provided by the present invention;

fig. 10 is a sixth schematic diagram of a detection circuit provided by the present invention;

fig. 11 is a seventh schematic diagram of a detection circuit provided by the present invention;

fig. 12 is a schematic diagram eight of a detection circuit according to the present invention.

Description of reference numerals:

10-a detection device; 20-short detection circuit; 30-a control circuit; 40-a working circuit; 50-an alarm device; 60-supporting feet; 11-a detection terminal; 111-detecting the screw; 112-a wire; 113-a connection terminal; 114-a nut; 21-a first loop; 22-a second loop; 211-a light emitting device; 212 — a first line interface; 213-second line interface; 221-a light sensing switch; 61-empty chamber.

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.

Electromagnetic heating equipment is through the electromagnetic induction phenomenon with electric energy conversion for the in-process of heat energy, through the coil production changing magnetic field among the resonant circuit, the magnetic field of change produces the vortex in the bottom of the pan of metal material for the pan generates heat. If the electromagnetic heating equipment is placed on the table top made of metal, the changed magnetic field generated by the electromagnetic heating equipment can generate eddy current on the table top made of metal, so that the temperature of the table top made of metal is increased, the shell and internal components of the electromagnetic heating equipment are damaged, and particularly potential safety hazards are brought to personnel moving around the electromagnetic heating equipment. Whether the table top where the electromagnetic heating equipment is located is a metal table top or not is detected, and the key for avoiding the adverse consequences is realized.

When detecting whether the mesa at electromagnetic heating equipment place is the metal material mesa, for example, can set up the detection device that devices such as magnet and connecting piece make up at electromagnetic heating equipment for electromagnetic heating equipment places when the metal material mesa, magnet drives the connecting piece and moves towards the metal material mesa through the roof that the connecting piece is connected, makes roof and automatically controlled board separation, and automatically controlled board stops the heating. For another example, a signal generator and a signal receiver may be disposed at the bottom of the bottom shell of the electromagnetic heating device, the signal generator may transmit a current or voltage signal, and if the table top where the electromagnetic heating device is located is a metal table top, the signal receiver may receive the current or voltage signal transmitted by the signal generator. However, these devices for detecting whether the table top on which the electromagnetic heating device is located is a metal table top are complex in structure and high in cost.

Whether the mesa is the detection of metal material mesa, reduces the complexity and the cost of device structure simultaneously for realizing electromagnetic heating equipment place mesa, the embodiment of the utility model provides a detection circuitry and electromagnetic heating equipment, this detection circuitry is including the short circuit detection circuitry who is located at least one detection device of the bottom of electromagnetic heating equipment drain pan and is connected with at least one detection device, short circuit detection circuitry and control circuit are connected. The short circuit detection circuit is used for detecting the connection or disconnection of the detection device. The detection device comprises at least two detection terminals, the detection device is switched on when the at least two detection terminals are contacted with the metal table board, and the detection device is switched off when the at least two detection terminals leave the metal table board. The short circuit detection circuit sends a detection result of the connection or disconnection of the detection device to the control circuit, and the control circuit executes preset control operation according to the detection result. Therefore, the utility model discloses the detection circuitry who adopts utilizes the electric conductivity of metal material mesa, realizes the detection of metal material mesa, and detection device simple structure, cost are lower among the detection circuitry, and short circuit detection circuitry also only needs to communicate the corresponding signal of output according to detection device, so, including detection device and short circuit detection circuitry's detection circuitry simple structure, cost are lower.

The detection circuit and the electromagnetic heating device provided in the present application are described in detail below with reference to specific embodiments, it is to be understood that the following specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a first schematic diagram of a detection circuit provided in the present application. As shown in fig. 1, the detection circuit includes at least one detection device 10 (one detection device 10 is taken as an example in fig. 1 and subsequent figures) disposed on a bottom case of the electromagnetic heating apparatus, a short detection circuit 20 connected to the detection device 10, and a control circuit 30 connected to the short detection circuit 20. Wherein:

the detection device 10 includes at least two detection terminals 11 (two detection terminals 11 are taken as an example in fig. 1 and subsequent figures), and the at least two detection terminals 11 are disposed at the bottom of the bottom case of the electromagnetic heating device. When the at least two detection terminals 11 are contacted with the metal table board, the detection device 10 is conducted, and when the detection terminals leave the metal table board, the detection device 10 is disconnected;

the short circuit detection circuit 20 detects the on or off of the detection device 10 and sends the detection result of the on or off of the detection device 10 to the control circuit 30;

the control circuit 30 performs a preset control operation according to the detection result.

In this embodiment, the detecting device 10 is disposed on the bottom case of the electromagnetic heating device, and the at least two detecting terminals 11 of the detecting device 10 are disposed at the bottom of the bottom case of the electromagnetic heating device, so that the detecting terminals 11 can be kept in contact with the table top when the electromagnetic heating device is placed on the table top. When the electromagnetic heating device is placed on the metal table, the detection terminal 11 and the metal table are conductive, and a passage is formed between the detection terminal 11 and the metal table. Therefore, when at least two detection terminals 11 of the detection device 10 simultaneously contact with the metal mesa, the at least two detection terminals 11 and the metal mesa form a path, and the detection device 10 is conducted. One detection device 10 comprises at least two detection terminals 11, so as to ensure that the at least two detection terminals 11 form a path when contacting the metal table top, so that the detection device 10 is conducted, and the at least two detection terminals 11 form an open circuit when leaving the metal table top, so that the detection device 10 is disconnected.

In this embodiment, the number of the detecting devices 10 is at least one, and the short circuit detecting circuit 20 is connected to at least one of the detecting devices 10 for detecting whether at least one of the detecting devices 10 is turned on or off. When the number of the detection devices 10 is only one, the short circuit detection circuit 20 detects whether the detection device 10 is turned on or off, if so, it indicates that the electromagnetic heating device is located on the metal table, otherwise, it indicates that the electromagnetic heating device is not located on the metal table. When the number of the detection devices 10 is multiple, the multiple detection devices 10 may be distributed at different positions of the electromagnetic heating apparatus, and the short-circuit detection circuit 20 detects whether each detection device 10 is turned on or off, if at least one detection device 10 is turned on, it indicates that the electromagnetic heating apparatus is located on the metal table, otherwise, it indicates that the electromagnetic heating apparatus is not located on the metal table. The more the number of the detection devices 10 is, the higher the accuracy of the detection of the metal table top is.

The metal table top can be one metal table top or a plurality of metal table tops which are mutually contacted or spliced together. Can be through different positions setting up a plurality of detection device 10 on electromagnetic heating equipment's drain pan for electromagnetic heating equipment strides and places two or more mutual contacts or splices when being in the same place on the metal material mesa, a plurality of detection device 10 respectively with the contact of different metal material mesas, for example, detection device A1 and metal material mesa B1 contact, detection device A2 and metal material mesa B2 contact, no matter detection device A1 switches on or detection device A2 switches on, all can show that electromagnetic heating equipment is located the metal material mesa. It can also be through setting up the different positions at electromagnetic heating equipment with the different detection terminal 11 of a detection device 10 for when electromagnetic heating equipment spaned and place two or more than mutual contact or splice metal material mesa together, this detection device 10's different detection terminal 11 respectively with the contact of different metal material mesas, whether can detect electromagnetic heating equipment and be located the metal material mesa through whether switching on of this detection device 10.

In this embodiment, the short circuit detection circuit 20 may send a first level signal to the control circuit 30 when detecting that at least one detection device 10 is turned on, and otherwise send a second level signal to the control circuit 30. The first level signal is a high level signal and the second level signal is a low level signal, or the first level signal is a low level signal and the second level signal is a high level signal.

When receiving the first level signal, that is, when the detection result is that at least one detection device 10 is turned on, the control circuit 30 executes a preset control operation, so as to prevent the electromagnetic heating device from working on a metal table, and improve the safety and the service life of the electromagnetic heating device.

In one possible implementation, as shown in fig. 2, the control circuit 30 is connected to an operating circuit 40 of the electromagnetic heating device. When the detection result received by the control circuit 30 is that the detection device 10 is turned on, the control circuit controls the working circuit 40 to stop heating, and the electromagnetic heating device is prevented from heating the metal table-board. When the control circuit 30 receives the detection result that the detection device 10 is turned off, the control circuit controls the operating circuit 40 to heat, so as to ensure the normal operation of the electromagnetic heating device. Wherein, the working circuit 40 of the electromagnetic heating device is a heating circuit, and the pot on the electromagnetic heating device is heated by the variable magnetic field generated by the resonance circuit.

In a possible implementation manner, as shown in fig. 3, an alarm device 50 is further provided on the electromagnetic heating device, and the control circuit 30 is connected with the alarm device 50. When the received detection result is that the detection device 10 is turned on, the control circuit 30 controls the alarm device 50 to send out alarm information to prompt a user not to use electromagnetic heating equipment on the metal table top. For example, the alarm device 50 may be one or more of the following: an audible alarm and a light-emitting indicator light. The sound alarm can be a buzzer, and the light-emitting indicator lamp can be a light-emitting diode indicator lamp.

The detection circuit in this embodiment utilizes the conductivity of metal to realize the detection of metal material mesa, and detection device only needs to include at least two detection terminals that have conductivity, and short circuit detection circuit only needs to detect whether detection device switches on to send corresponding level signal to control circuit. Therefore, the detection circuit comprising the detection device and the short-circuit detection circuit has simple structure and low cost.

The detection device 10 is described with reference to specific schematic diagrams on the basis of any one of the embodiments shown in fig. 1 to 3.

The electromagnetic heating device generally comprises a bottom shell and a panel, wherein the bottom shell is provided with an inner cavity, components such as a coil panel and a fan are arranged in the inner cavity, on the electromagnetic oven heating device, the detection device 10 is positioned on the bottom shell of the electromagnetic heating device, the detection terminal 11 of the detection device 10 is positioned at the bottom of the bottom shell of the electromagnetic heating device, and the short-circuit detection circuit 20, the control circuit 30 and the working circuit 40 are arranged on a circuit board positioned in the inner cavity.

Fig. 4 shows a schematic view of the internal structure of the bottom case of the electromagnetic heating apparatus, and fig. 5 and 6 show enlarged schematic views of the structure of the detection terminal 11 inside the support leg 60. As shown in fig. 4 (refer to fig. 5 and fig. 6 simultaneously), the bottom of the bottom case of the electromagnetic heating device is provided with a supporting leg 60, and the detecting terminal 11 of the detecting device 10 is disposed on the supporting leg 60, so that when the electromagnetic heating device is placed on the table top, the detecting terminal 11 is abutted to the table top more tightly, and the accuracy of the detecting circuit for detecting the metal table top is improved.

The bottom of the bottom case of the electromagnetic heating device shown in fig. 4 is provided with 4 supporting legs 60, the 4 supporting legs 60 are distributed at four corners of the bottom case of the electromagnetic heating device, two supporting legs 60 on one side are respectively provided with one detecting terminal 11 of the same detecting device 10, and the other two supporting legs 60 are not provided with the detecting terminal 11. Fig. 4 shows only one arrangement of the support legs 60 and the detection terminals 11, and the number of the support legs 60 may be less than 4 or greater than 4, and the detection terminals 11 may be provided on all the support legs 60, or a plurality of detection terminals 11 may be provided on one support leg 60.

In a possible implementation manner, in the case that one or more detection devices 10 are provided on the electromagnetic heating apparatus, and one detection device 10 includes at least two detection terminals 11, at least two detection terminals 11 of the same detection device 10 may be provided on the same supporting leg 60. Thus, when one supporting leg 60 of at least two detecting terminals 11 of the detecting device 10 is located on the metal table, the detecting circuit can detect the metal table, but the plurality of supporting legs 60 are not necessarily located on the metal table at the same time, so that the accuracy of detecting the metal table is effectively improved.

Further, the supporting leg 60 is provided with a vacant cavity 61 communicating the outside and the inside of the electromagnetic heating device, and the detection terminal 11 is located in the vacant cavity 61, so that the internal space of the electromagnetic heating device is saved, and meanwhile, the detection terminal 11 can be better fixed on the supporting leg 60.

Further, the detection terminal 11 includes a detection screw 111 and a lead 112. As shown in fig. 7, the head of the detection screw 111 is located outside the supporting foot 60, wherein fig. 7 is a schematic structural diagram of the outside of the supporting foot. As shown in fig. 4, 5 and 6, the screw of the detection screw 111 is located in the vacant cavity 61 of the support foot 60. One side of the lead 112 is connected to the screw of the detection screw 111, and the other side is connected to the short-circuit detection circuit 20. When the electromagnetic heating device is placed on the metal table, the head of the detection screw 111 abuts against the metal table, and the detection screws 111 and the lead wires 112 of the at least two detection terminals 11 form a passage with the metal table, so that the detection device 10 is turned on. Therefore, by constituting the detection terminal 11 by the detection screw 111 and the lead wire 112 and constituting the detection device 10 by at least two detection terminals 11, the structural complexity and cost of the detection device 10 are effectively reduced.

Furthermore, a connection terminal 113 is disposed on the screw of the detection screw 111, and the connection terminal 113 is used to fix one side of the conductive wire 112 on the screw of the detection screw 111, so as to increase the stability of the connection of the conductive wire 112 on the detection screw 111, and further improve the connection stability of the detection device 10 and the short circuit detection circuit 20.

Furthermore, the detection terminal 11 further includes a nut 114, and the nut 114 and the detection screw 111 cooperate to fix the detection terminal 11 on the supporting leg 60, so as to improve the mounting stability of the detection terminal 11 on the supporting leg 60.

On the basis of the detection circuit shown in fig. 1, fig. 2 or fig. 3, and/or the electromagnetic heating device shown in fig. 4, fig. 5, fig. 6 or fig. 7, the short circuit detection circuit 20 in the detection circuit is further illustrated below with reference to specific schematic diagrams.

Fig. 8 is a fourth schematic diagram of a detection circuit provided in the present application. Referring to fig. 8, in the detection circuit, the short detection circuit 20 includes a first circuit 21 and a second circuit 22, the first circuit 21 is connected to at least two detection terminals 11 of the detection device 10, and the second circuit 22 is connected to the control circuit 30. When the detection device 10 is turned on, the first loop 21 controls the second loop 22 to be turned on, and the second loop 22 outputs a first level signal to the control circuit 30. When the detection device 10 is turned off, the first circuit 21 controls the second circuit 22 to be turned off, and the second circuit 22 outputs a second level signal to the control circuit 30.

In this embodiment, the short circuit detection circuit 20 is connected to the detection device 10 through the first loop 21, and is connected to the control circuit 30 through the second loop 22. The first loop 21 is used for detecting the conduction of the detection device 10, and the second loop 22 is used for sending a corresponding level signal to the control circuit 30 according to the detection result of the first loop 21. When the detection device 10 is turned on, the first loop 21 is turned on, and controls the second loop 22 to be turned on, and the turned-on second loop 22 outputs a first level signal, such as a high level signal, to the control circuit 30. When the detection device 10 is turned off, the first circuit 21 is turned off and controls the second circuit 22 to be turned off, and the turned-off second circuit 22 outputs a second level signal, such as a low level signal, to the control circuit 30. Therefore, the short-circuit detection circuit 20 detects the conduction of the detection device 10 and sends the detection result to the control circuit 30 through the first loop 21 and the second loop 22, and the first loop 21 controls the second loop 22, but the output and conduction of the second loop 22 do not affect the first loop 21, so that the anti-interference capability and stability of the level signal output from the short-circuit detection circuit 20 to the control circuit 30 are improved, and the accuracy of the detection of the metal table top is further improved.

Based on the detection circuit shown in fig. 8, fig. 9 is a fifth schematic diagram of a detection circuit provided in the present application. Referring to fig. 9, in the short-circuit detection circuit 20, the first circuit 21 includes a light emitting device 211, the second circuit 22 includes a light sensing switch 221, and the first circuit 21 can control the on/off of the light sensing switch 221 in the second circuit 22 by the light emitting device 211 emitting or extinguishing, so as to control the on/off of the second circuit 22 by the first circuit 21.

For example, when the first circuit 21 is turned on, the light emitting device 211 emits light, the light sensing switch 221 senses a light signal emitted by the light emitting device 211, the light sensing switch 221 is turned on, and the second circuit 22 is turned on. When the first circuit 21 is disconnected, the light-emitting device 211 is turned off, the light-sensing switch 221 does not sense a light signal, the light-sensing switch 221 is turned off, and the second circuit 22 is turned off. Therefore, the electrical isolation between the first loop circuit 21 and the second loop circuit 22 is achieved by converting the electrical signal of the first loop circuit 21 into an optical signal and converting the optical signal into the electrical signal of the second loop circuit 22, thereby improving the anti-interference capability and stability of the short circuit detection circuit 20.

Based on the detection circuit shown in fig. 9, fig. 10 is a sixth schematic diagram of a detection circuit provided in the present application. Referring to fig. 10, the first loop 21 further includes a first line interface 212 and a second line interface 213, and the first line interface 212 and the second line interface 213 are respectively used for connecting different ones of the at least two detection terminals 11, so that the at least two detection terminals 11 are connected to the first loop 21 through the first line interface 212 and the second line interface 213. In the first circuit 21, one pole of the light emitting device 211 is connected to a power supply, the other pole is connected to the first line interface 212, the first line interface 212 is connected to the detection terminal 11, and the second line interface 213 is grounded. Here, VCC in the figure denotes a power supply.

In this embodiment, one pole of the light emitting device 211 is connected to a power supply, the other pole is connected to one detection terminal 11 of the detection device 10 through the first line interface 212, and the other detection terminal 11 is grounded through the second line interface 213, so that at least two detection terminals 11 are connected in series with the light emitting device 211. When the detecting device 10 is turned on, the first loop 21 is turned on, and the light emitting device 211 emits light. When the detection device 10 is disconnected, the first loop 21 is disconnected, and the light-emitting device 211 is turned off, so that the first loop 21 detects the connection or disconnection of the detection device 10, and the detection result of the connection or disconnection of the detection device 10 is fed back to the second loop 22 through the light-emitting device 211.

Based on the detection circuit shown in fig. 9 or fig. 10, fig. 11 is a seventh schematic diagram of a detection circuit provided in the present application. Referring to fig. 11, in the second circuit 22 of the short-circuit detection circuit 20, one pole of the photo-sensing switch 221 is connected to the control circuit 30, and is grounded via a first resistor R1, and the other pole is connected to the power supply via a second resistor R2. The control circuit 30 is, for example, a Microcontroller Unit (MCU) shown in fig. 8.

In this embodiment, the first resistor R1 and the second resistor R2 function as a voltage divider to protect the photo-sensing switch 221. When the second circuit 22 is turned on, the voltage value of the first resistor R1 increases, and the control circuit 30 receives the first level signal, which is a high level signal. When the second loop 22 is opened, the current in the first resistor R1 decreases to 0, and the control circuit 30 receives the second level signal which is a low level signal.

In one possible implementation, an optocoupler may be used as the short detection circuit 20. Wherein, the input of opto-coupler is connected with detection device 10, and the output of opto-coupler is connected with control circuit 30 to utilize the electrical isolation characteristic of opto-coupler, improve short circuit detection circuitry 20's stability.

Based on the detection circuit shown in fig. 11, fig. 12 is a schematic diagram eight of a detection circuit provided in the present application. In fig. 12, a circuit structure of the operating circuit 40 of the electromagnetic heating apparatus and a circuit structure of the short-circuit detection circuit 20 are shown, the operating circuit 40 generates a changing magnetic field through the resonant circuit to realize the electromagnetic heating function of the electromagnetic heating apparatus, and since the operating circuit 40 is a circuit common in the electromagnetic heating apparatus, the operating circuit 40 will not be described in detail herein. The short circuit detection circuit 20 is an optical coupler, the light emitting device 211 is a light emitting diode, and the optical sensing switch 221 is a phototriode.

In this embodiment, the short circuit detection circuit 20 is connected to at least two detection terminals 11 of the detection device 10 through a connector 1 and a connector 2, the connector 1 is connected to the negative electrode of the light emitting diode, the connector 2 is grounded, a third resistor R3 is connected between the positive electrode of the light emitting diode and the power supply, and the third resistor R3 is used for protecting the light emitting diode. The collector of the phototransistor is connected to the power supply via a second resistor R2, and the emitter is connected to the input terminal S1 of the control circuit 30 and to ground via a first resistor R1. The output terminal S2 of the control circuit is connected to an Insulated Gate Bipolar Transistor (IGBT for short) of the operating circuit. The connector 1 is the first line interface 212 in fig. 10 and 11, and the connector 2 is the second line interface 213 in fig. 10 and 11.

In this embodiment, when the electromagnetic heating device is placed on the metal table, the detection device 10 is turned on, the light emitting diode emits light, the phototriode senses the light signal of the light emitting diode to be turned on, the control circuit receives the high level signal and stops sending the IGBT on signal to the IGBT of the working circuit, so that the working circuit is turned off, and the electromagnetic heating device cannot continue to work. When the electromagnetic heating equipment leaves the metal table surface, the detection device 10 is switched off, the light emitting diode is turned off, the phototriode cannot sense the light signal to be switched off, the control circuit receives the low level signal and sends an IGBT driving signal to the IGBT of the working circuit, the working circuit is switched on, and the electromagnetic heating equipment works. Therefore, the detection circuit realizes the detection of the metal table board, and has the advantages of simple circuit structure, lower cost and stable detection effect.

The embodiment of the application also provides electromagnetic heating equipment, which comprises a bottom shell with an inner cavity and a panel arranged on the bottom shell in a covering mode, wherein a circuit board is arranged in the inner cavity, and the circuit board is provided with a detection circuit provided by any one of the above embodiments. The specific content and the implementation effect of the electromagnetic heating device provided in this embodiment may refer to the specific content and the implementation effect of the detection circuit provided in any one of the above embodiments, and are not described herein again.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

In the present application, the terms "include" and variations thereof may refer to non-limiting inclusions; the term "or" and variations thereof may mean "and/or". The terms "first," "second," and the like in this application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. In the present application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Claims (10)

1. A detection circuit is applied to electromagnetic heating equipment and is characterized in that,

the detection circuit comprises at least one detection device (10) arranged on a bottom shell of the electromagnetic heating equipment, a short circuit detection circuit (20) connected with the at least one detection device (10), and a control circuit (30) connected with the short circuit detection circuit (20);

the at least one detection device (10) comprises at least two detection terminals (11), the at least two detection terminals (11) are arranged at the bottom of the bottom shell, the detection device (10) is conducted when the at least two detection terminals (11) are in contact with the metal table top, and the detection device (10) is disconnected when the at least two detection terminals (11) are away from the metal table top;

the short circuit detection circuit (20) detects the connection or disconnection of the detection device (10), and sends the detection result of the connection or disconnection of the detection device (10) to the control circuit (30);

the control circuit (30) executes a preset control operation according to the detection result.

2. The circuit according to claim 1, characterized in that the control circuit (30) is connected to an operating circuit (40) of the electromagnetic heating device and/or to an alarm device (50), the control circuit (30) controlling the actuation of the operating circuit (40) and/or the alarm operation of the alarm device (50) depending on the detection result.

3. The circuit according to claim 2, characterized in that at least two detection terminals (11) of said at least one detection device (10) are provided on supporting feet (60) of the bottom of a bottom shell of said electromagnetic heating apparatus.

4. The circuit of claim 3,

at least two detection terminals (11) of the same detection device (10) are arranged on the same supporting leg (60).

5. The circuit of claim 3,

the intercommunication is seted up to the inside of supporting legs (60) the outside of electromagnetic heating equipment and vacant chamber (61) of inner chamber, detect terminal (11) including detecting screw (111) and wire (112), the head that detects screw (111) is located the outside of supporting legs (60), the screw rod that detects screw (111) is located vacant chamber (61), one side of wire (112) is connected the screw rod, the opposite side of wire (112) is connected short circuit detection circuitry (20).

6. The circuit of claim 5,

the screw rod is provided with a connecting terminal (113), and the connecting terminal (113) is used for fixing one side of the lead (112) on the screw rod;

the detection terminal (11) further comprises a nut (114), and the detection terminal (11) is fixed on the supporting leg (60) through the nut (114) and the detection screw (111).

7. The circuit according to any one of claims 1-6,

the short circuit detection circuit (20) comprises a first loop (21) and a second loop (22), the first loop (21) is connected with the detection device (10), and the second loop (22) is connected with the control circuit (30);

when the detection device (10) is conducted, the first loop (21) controls the second loop (22) to be conducted, and the second loop (22) outputs a first level signal to the control circuit (30);

when the detection device (10) is disconnected, the first loop (21) controls the second loop (22) to be disconnected, and the second loop (22) outputs a second level signal to the control circuit (30).

8. The circuit according to claim 7, wherein the first circuit (21) comprises a light-emitting device (211), the second circuit (22) comprises a light-sensing switch (221), and the first circuit (21) controls the light-sensing switch (221) to be turned on or off through the light-emitting device (211).

9. The circuit of claim 8,

the first loop (21) further comprises a first line interface (212) and a second line interface (213), and the at least two detection terminals (11) are connected into the first loop (21) through the first line interface (212) and the second line interface (213);

one pole of the light-emitting device (211) is connected with a power supply, the other pole of the light-emitting device is connected with the first line interface (212), and the second line interface (213) is grounded;

one pole of the light sensing switch (221) is connected with the control circuit (30) and is grounded through a first resistor R1, and the other pole of the light sensing switch is connected with a power supply through a second resistor R2.

10. An electromagnetic heating device comprising a bottom shell having an inner cavity and a panel covering said bottom shell, said inner cavity having a circuit board disposed therein, wherein said circuit board has a detection circuit as claimed in any one of claims 1 to 9 disposed thereon.

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