Control circuit of oven door and oven

Abstract

The utility model discloses a control circuit of an oven door and an oven, and relates to the field of circuit control, a position detection switch is arranged on an oven main body, can directly detect the contact condition between a first part and a second part, and generates different signals to a controller according to the contact state of the first part and the second part; and the controller judges whether the oven door is closed or not according to the received signal. The position detection switch can detect the mechanical action between the first part and the second part, and the oven door is closed through the contact of the first part and the second part, so that the closing condition of the oven door can be identified more accurately through the mechanical position detection switch; according to the oven, the problem that a reflection type detection sensor detects mistakenly is avoided, the controller can output a corresponding signal to the temperature control circuit of the oven when the oven door is closed, the temperature control circuit of the oven starts to heat the inner cavity of the oven after receiving the signal, and the closed state of the oven door in the working process of the oven is ensured.

Description

Technical Field

[0001] The utility model relates to the field of circuit control, in particular to a control circuit for an oven door and an oven. Background Technique

[0002] During the chip soldering process of integrated circuits, the silver glue process is often used. Silver glue is an adhesive containing silver powder that can play an adhesive role. During the chip soldering process, silver glue is needed to fix the chip on the lead frame, and then it is baked and cured by a sealed nitrogen oven to achieve the bonding of the entire integrated chip. The baking process needs to be carried out in a closed oven. Once the oven door is not closed properly or is abnormally opened during the baking process, a large amount of air will enter the oven, resulting in oxidation of the entire product and subsequent scrapping. How to ensure the accurate closing of the oven door during the baking process is a technical problem that urgently needs to be solved currently.

[0003] In the prior art, a reflective detection sensor is set to detect in real time whether the oven door is closed. However, the current reflective sensors all have a relatively large light-reflecting area. As long as there is light reflected back, it will directly determine that the oven door has been closed. Therefore, when the oven door is in a semi-closed state or the door lock has not been engaged in the lock catch, the reflective detection sensor will also receive the reflected light and directly determine that the oven door has been closed. Even if the oven door is seriously not closed properly, the detection sensor may directly display that the door is closed, and the error of the detection result is very large, and the misjudgment situation is serious, and it cannot accurately judge the closing situation of the oven door. Content of the Utility Model

[0004] The purpose of the utility model is to provide a control circuit for an oven door and an oven, which can more accurately identify the closing situation of the oven door through a mechanical position detection switch, avoid the problem of misdetection of the reflective detection sensor, and the controller can output a corresponding signal to the temperature control circuit of the oven when the oven door is closed. After receiving this signal, the oven temperature control circuit starts to heat up the inner cavity of the oven to ensure the closed state of the oven door during the operation of the oven.

[0005] To solve the above technical problems, the utility model provides a control circuit for an oven door, including:

[0006] A door lock, the door lock includes a first component provided on the oven door and a second component provided on the oven body. When the first component and the second component are in contact, the oven door is closed;

[0007] A position detection switch, which is arranged on the oven body and is used to generate a corresponding signal according to the contact state between the first component and the second component;

[0008] A controller, with its input end connected to the position detection switch, is configured to determine the open / closed state of the oven door based on the signal generated by the position detection switch.

[0009] Optionally, the position detection switch is a proximity sensor and / or a microswitch.

[0010] Optionally, it further includes:

[0011] A prompting module connected in series with the position detection switch, which is configured to output an alarm prompt signal when the first component and the second component are not in contact.

[0012] Optionally, the door lock is a magnetic control lock, and the electromagnetic coil is arranged in the second component. The control circuit further includes:

[0013] A control switch, with its first end connected to the first end of the electromagnetic coil, its second end connected to the second end of the electromagnetic coil, and its control end connected to the output end of the controller. It is configured to conduct based on the control of the controller when the oven door is closed and the temperature inside the oven cavity reaches a preset value.

[0014] Optionally, it further includes:

[0015] A temperature detection module arranged inside the oven cavity, with its output end connected to the input end of the controller. It is configured to detect the temperature data inside the oven cavity and output the temperature data to the controller.

[0016] Optionally, the control switch is a temperature control switch.

[0017] Optionally, it further includes:

[0018] A power conversion module, with its input end connected to an AC power supply and its output end connected to the electromagnetic coil respectively. It is configured to convert the AC power supply into direct current to supply power to the electromagnetic coil.

[0019] Optionally, the power conversion module includes:

[0020] A transformer, with its primary winding connected to the AC power supply;

[0021] A rectifier bridge, with its input end connected to the secondary winding of the transformer;

[0022] A first capacitor, with its first end connected to the first output end of the rectifier bridge and serving as the first output end of the power conversion module, and its second end connected to the second output end of the rectifier bridge and serving as the second output end of the power conversion module.

[0023] Optionally, the power conversion module further includes:

[0024] A linear voltage regulator, whose input terminal is respectively connected to the first terminal of the first capacitor and the first output terminal of the rectifier bridge, and whose ground terminal is grounded;

[0025] A second capacitor, with its first terminal serving as the first output terminal of the power conversion module and its second terminal serving as the second output terminal of the power conversion module;

[0026] A first resistor, with its first terminal respectively connected to the output terminal of the linear voltage regulator and the first terminal of the second capacitor, and its second terminal respectively connected to the second terminal of the second capacitor, the second terminal of the first capacitor, and the second output terminal of the rectifier bridge.

[0027] To solve the above technical problems, the present utility model also provides an oven, which includes an oven door, an oven body, and a control circuit for the oven door as described above.

[0028] The present utility model provides a control circuit for an oven door, which includes a door lock, a position detection switch, and a controller. The process of locking the door is achieved through the contact between a first component provided on the oven door and a second component provided on the oven body. The position detection switch is provided on the oven body and can directly detect the contact situation between the first component and the second component, and generate different signals to the controller according to the contact state between the first component and the second component. The controller then determines whether the oven door is closed based on the received signals. The position detection switch can detect the mechanical action between the first component and the second component, and the contact between the first component and the second component realizes the closing of the oven door. Therefore, through the mechanical position detection switch, the closing situation of the oven door can be more accurately identified, avoiding the problem of false detection of the reflective detection sensor. The controller can output corresponding signals to the temperature control circuit of the oven when the oven door is closed. After receiving this signal, the oven temperature control circuit starts to heat the inner cavity of the oven to ensure the closed state of the oven door during the operation of the oven.

[0029] The present utility model also provides an oven, which has the same beneficial effects as the above control circuit for the oven door. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the prior art and the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a control circuit for an oven door provided by the present utility model;

[0032] Figure 2Schematic diagram of the control circuit of another oven door provided by the present utility model;

[0033] Figure 3 Schematic diagram of the connection circuit of a proximity sensor provided by the present utility model;

[0034] Figure 4 Schematic diagram of the wiring of a temperature control switch provided by the present utility model;

[0035] Figure 5 Schematic diagram of the wiring of another temperature control switch provided by the present utility model;

[0036] Figure 6 Schematic diagram of the structure of a power conversion module provided by the present utility model. Detailed implementation manners

[0037] The core of the present utility model is to provide a control circuit and an oven for an oven door. Through a mechanical position detection switch, the closing situation of the oven door can be more accurately identified, avoiding the problem of misdetection of a reflective detection sensor. The controller can output a corresponding signal to the temperature control circuit of the oven when the oven door is closed. After receiving this signal, the oven temperature control circuit starts to heat the inner cavity of the oven to ensure the closed state of the oven door during the operation of the oven.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] Please refer to Figure 1 , Figure 1 Schematic diagram of the control circuit of an oven door provided by the present utility model; Please refer to Figure 2 , Figure 2 Schematic diagram of the control circuit of another oven door provided by the present utility model; To solve the above technical problems, the present utility model provides a control circuit for an oven door, including:

[0040] A door lock, which includes a first component 11 provided on the oven door 1 and a second component 21 provided on the oven main body 2. When the first component 11 and the second component 21 are in contact, the oven door 1 is closed;

[0041] A position detection switch 22 is provided on the oven main body 2 and is used to generate corresponding signals according to the contact state between the first component 11 and the second component 21;

[0042] A controller 3, whose input end is connected to the position detection switch 22, is used to determine the open / closed state of the oven door 1 based on the signals generated by the position detection switch 22.

[0043] It is not difficult to understand that in order to close the oven door 1, a first component 11 and a second component 21 are provided on the oven door 1 and the oven body to function as a door lock, realizing the functions of opening and closing the door. The first component 11 and the second component 21 will come into contact through suction or other means. When the first component 11 and the second component 21 are in contact, the oven door 1 and the oven body will be flush, and the oven door 1 is in the normal closed position, enabling the enclosure of the oven cavity. Therefore, in this application, by setting the position detection switch 22, the position relationship between the first component 11 and the second component 21 is detected to determine whether the first component 11 and the second component 21 are in contact, and two corresponding different signals are generated and output to the controller 3 in two cases where the first component 11 and the second component 21 are in contact and not in contact. The controller 3 can determine whether the first component 11 and the second component 21 remain in contact according to the received signals, thereby realizing the determination of the open / closed state of the oven door 1.

[0044] It should be noted that when the oven door 1 is in the closed state, the first component 11 and the second component 21 will continuously maintain the contact state, and the position detection switch 22 will also continuously output the signals corresponding to the contact state to the controller 3. Once there is an abnormal opening or the oven door 1 is not closed in place, the position detection switch 22 will change to output the signals corresponding to the non-contact state to the controller 3, and the controller 3 can timely obtain the state change of the oven door 1. The specific types and implementation methods of the door lock and the first component 11 and the second component 21 therein are not particularly limited in this application and can be realized by door locks of types such as magnetic locks and pneumatic locks.

[0045] It is not difficult to understand that the oven body refers to the main part of the oven excluding the oven door 1, including the oven cavity, the oven door frame, and the inner cavity housing. When the oven door 1 is closed, the first component 11 and the second component 21 come into contact, the oven door 1 is flush with the oven cavity, and is tightly closed with the oven door frame to achieve the airtightness inside the oven. The position detection switch 22 can detect whether the first component 11 and the second component 21 are in contact through its own mechanical action. The position detection switch 22 can be realized by using normally closed contacts. When the first component 11 and the second component 21 are not in contact, the position detection switch 22 provided on the oven body 2 cannot detect the change of the oven door 1, will not be squeezed by the oven door 1, and remains in the normally closed state. When the first component 11 and the second component 21 are in contact, the contact between the oven door 1 and the oven body 2 will squeeze the position detection switch 22, and the position detection switch 22 will act after being subjected to an external force and change from the closed state to the open state; the disconnection or closure of the position detection switch 22 will be output to the controller 3 in the form of corresponding electrical signals.

[0046] It should be noted that the specific types and implementation methods of the position detection switch 22 and the controller 3 are not particularly limited in this application. The position detection switch 22 can be realized by various switch devices that act under external force; in order to accurately identify the contact situation between the first component 11 and the second component 21, the position detection switch 22 can be arranged on the housing of the second component 21. The number and position of the position detection switch 22 are not particularly limited in this application, and can be set and adjusted according to the position of the oven door 1 in the closed state and the contact relationship with the oven body 2 in actual applications. The sensor for detecting door closing is adjusted from light detection to the position detection switch 22, and whether the oven door 1 is closed is detected through the mechanical switch action. The action of the position detection switch 22 can directly reflect the contact situation between the oven door 1 and the oven body, accurately reflect whether the oven door 1 is closed, and reasonably solve the problem that the large light reflection area is prone to false detection.

[0047] The present utility model provides a control circuit for an oven door, including a door lock, a position detection switch 22, and a controller 3. The process of locking the door is achieved by the contact between a first component 11 provided on the oven door 1 and a second component 21 provided on the oven main body 2. The position detection switch 22 is provided on the oven main body 2, and can directly detect the contact situation between the first component 11 and the second component 21, and generate different signals to the controller 3 according to the contact state of the first component 11 and the second component 21. The controller 3 then determines whether the oven door 1 is closed according to the received signal. The position detection switch 22 can detect the mechanical action between the first component 11 and the second component 21, and the contact of the first component 11 and the second component 21 realizes the closing of the oven door 1. Therefore, the closing situation of the oven door 1 can be more accurately identified through the mechanical position detection switch 22, avoiding the problem of misdetection of the reflective detection sensor. The controller 3 can output a corresponding signal to the temperature control circuit of the oven when the oven door 1 is closed. After receiving this signal, the oven temperature control circuit starts to heat the inner cavity of the oven to ensure the closed state of the oven door 1 during the operation of the oven.

[0048] Based on the above embodiments:

[0049] Please refer to Figure 3 , Figure 3 which is a schematic connection diagram of a proximity induction switch provided by the present utility model; As an alternative embodiment, the position detection switch 22 is a proximity induction switch and / or a microswitch.

[0050] It is not difficult to understand that the position detection switch 22 can be implemented by adopting a proximity induction switch and / or a microswitch. The microswitch is easy to implement and has a simple structure. Its normally closed contact can be directly taken and set on the oven main body 2; or the proximity induction switch can be set on the oven door 1 or the oven main body 2 to detect whether the distance between the oven door 1 and the oven main body 2 is close enough, reaching a very close distance close to 0 that can only be achieved when closed. For more accurate identification, a microswitch and a proximity induction switch can also be set on the oven main body 2 at the same time. The position detection switch 22 is realized by setting multiple position detection sub-switches, and the detection results of multiple position detection sub-switches are used to ensure the accurate identification of the opening and closing states of the oven door 1. As Figure 2 shown, Figure 2 a microswitch is adopted. As Figure 3 shown, Figure 3 the connection method of the proximity induction switch in Figure 2A series circuit of a microswitch and a buzzer; when the oven is in normal use and reaches the set temperature, the moving contact K1 of the temperature control switch is turned on. The negative pole of the proximity sensor is connected to the negative pole of the 12V DC power supply, and at the same time, it is connected to the positive pole of the 12V DC power supply through the buzzer. The proximity sensor gets power supply and starts to work, and uses the sensor to detect whether the door is closed properly. If it is closed properly, a high-level signal is output to the buzzer. Since the positive pole of the buzzer is connected to the 12V positive pole, the buzzer does not make a sound when the negative pole is connected to the high level. When the proximity sensor detects that the oven door 1 is not closed properly, a low-level signal is output to the buzzer. The negative pole of the buzzer is connected to the low level, forming a power supply circuit, so the buzzer makes a sound.

[0051] Specifically, the function of the position detection switch 22 can be effectively realized through the proximity sensor and / or the microswitch, accurately identifying the open / closed state of the oven door 1, and the structures of the proximity sensor and / or the microswitch are simple and easy to implement, which is beneficial to the simple implementation of the entire control circuit.

[0052] As an alternative embodiment, it further includes:

[0053] A prompt module B connected in series with the position detection switch 22, which is used to output an alarm prompt signal when the first component 11 and the second component 21 are not in contact.

[0054] It is not difficult to understand that, in order to facilitate the operator to determine whether the oven is completely closed, especially when the oven is about to enter the heating and baking state, if the oven door 1 is not closed properly, the operator needs to be reminded in time to close the door. A prompt module B connected in series with the position detection switch 22 can be added to the circuit. The two ends of the series-connected prompt module B and the position detection switch 22 are respectively connected to the two ends of the power supply. When the first component 11 and the second component 21 are not in contact, the oven door 1 is not completely closed, and the position detection switch 22 remains in the closed state. The prompt module B gets powered due to the closed position detection switch 22 and outputs a corresponding alarm prompt signal; when the first component 11 and the second component 21 are in contact, the oven door 1 is completely closed, and the position detection switch 22 becomes open due to the closed oven door 1. The prompt module B is disconnected from the power supply by the position detection switch 22 and does not output a corresponding alarm prompt signal. The specific type and implementation method of the prompt module B are not particularly limited in this application, and the specific type and implementation method of the alarm prompt signal are not particularly limited in this application. Specifically, a buzzer or an audible and visual display module can be used, etc. For example, a buzzer is set. When the oven door 1 is not closed properly, the buzzer emits an alarm sound to remind the operator to close the door properly. The position detection switch 22 cooperating with the buzzer can achieve timely alarm reminder.

[0055] Specifically, the switch state of the oven door 1 can be intuitively and effectively characterized by adding a setting prompt module B, and the operator can be timely reminded through an alarm prompt signal, so as to avoid the operator forgetting to determine the switch situation of the oven door 1 and ensure that the oven door 1 can remain closed during the working process.

[0056] As an alternative embodiment, the door lock is a magnetically controlled lock, the electromagnetic coil is arranged in the second component 21, and the control circuit further includes:

[0057] A control switch, with the first end connected to the first end of the electromagnetic coil, the second end connected to the second end of the electromagnetic coil, and the control end connected to the output end of the controller 3, for conducting based on the control of the controller 3 when the oven door 1 is closed and the temperature in the oven cavity reaches a preset value.

[0058] It is not difficult to understand that considering that the oven door 1 in the prior art can be opened arbitrarily, during the operation of the oven, other people may accidentally open the oven door 1 without knowing it, resulting in the oxidation and scrapping of the product. During the normal baking process, the machine program of the oven will go through three processes: heating, constant temperature, and cooling. After the end of the third process, the oven will give an alarm reminder that the baking is over. At this time, the temperature in the oven will drop to about 50 degrees, and opening the oven door 1 at this time will have no impact on the product. If the oven door 1 is abnormally opened before the program ends, when the temperature in the oven is at a high temperature (above 90 degrees), a large amount of air enters the oven, and the risk of product oxidation is relatively high. Therefore, in order to prevent the oven door 1 from being accidentally opened during the baking process, a controllable magnetically controlled lock can be used to implement the door lock, and then a control switch capable of controlling the door lock to maintain the locked state is added as the door lock controller. When the temperature inside the oven is greater than the set value, it means that the oven is in use and baking is in progress, and the cavity is in a high-temperature state. At this time, the control switch is turned on under the control of the controller 3, and the turned-on control switch will cause the electromagnetic coil of the magnetically controlled lock to be energized, thereby controlling the magnetically controlled lock to lock the door and prevent the door from being opened.

[0059] It should be noted that the magnetic lock realizes the function of the door lock through the electromagnetic action of the electromagnetic coil. When the door lock is a magnetic lock, an electromagnetic coil is provided in the second part of the oven body 2, and the first part is mainly conductive metal. When the electromagnetic coil is energized, the coil current will generate a magnetic field, and the magnetic field will generate electromagnetic attraction, driving the conductive metal in the first part to attract the second part, thereby realizing the process of locking the door. Therefore, when the electromagnetic coil is energized, the oven door 1 can be controlled to remain closed, ensuring that the oven can remain in a locked state during the baking process. When the oven door 1 is made of conductive metal, the first part can be directly reused to realize the oven door 1 itself made of conductive metal. In addition to the magnetic lock, the door lock can also be realized by a cylinder-controlled door lock. The cylinder-controlled door lock will be provided with an electromagnetic coil and an action cylinder in the second part, and a piston rod is provided on the action cylinder. A groove corresponding to the piston rod is provided in the first part. When the electromagnetic coil is energized, the action cylinder is actuated, the piston rod is actuated, and is stuck in the groove provided in the first part to hold the door, and the process of locking the door is realized by mechanical positioning. Therefore, the door lock only needs to be implemented by a controllable door lock, and is not limited to the magnetic lock proposed in this embodiment. The specific type and implementation method of the control switch are not particularly limited in this application. The specific value of the preset value is not particularly limited in this application, and it can be set according to the actual baking temperature of the oven.

[0060] Furthermore, the control switch can only perform the temperature control process when the oven door 1 is confirmed to be closed, so a normally closed contact can be added to the circuit of the controller 3 outputting the control instruction to the control switch, such as Figure 2 As shown in K3 in the figure, when the door is not fully closed, the position detection switch 22 is closed, causing the coil corresponding to the normally closed contact to be energized, and the normally closed contact connected in series between the control switch and the controller 3 disconnects the COM and NC points, the control instruction is forced to be interrupted, and the controller 3 cannot output the control instruction to turn on the control switch, and cannot start the process of heating up and locking the door; when the door is fully closed, the position detection switch 22 is disconnected, the coil corresponding to the normally closed contact loses power, and the normally closed contact connected in series between the control switch and the controller 3 maintains connection between the COM and NC points, and the controller 3 can output the control instruction normally to start the process of heating up and locking the door. Figure 2 is a specific implementation method when the position detection switch is a micro switch K2. When the position detection switch is a proximity induction switch, the setting method of the normally closed contact and the corresponding coil is the same as Figure 2 Similarly, this application will not be repeated here.

[0061] Specifically, by adding a door lock control process during the oven baking process, the oven door 1 can be effectively kept closed during high-temperature baking, thereby avoiding the risk of accidental opening, preventing product oxidation and the risk of scrapping, and ensuring the effective implementation of the entire baking process.

[0062] As an alternative embodiment, it further includes:

[0063] A temperature detection module disposed in the inner cavity of the oven, with its output end connected to the input end of the controller 3, for detecting the temperature data of the inner cavity of the oven and outputting the temperature data to the controller 3.

[0064] It is not difficult to understand that the on / off of the control switch needs to be controlled according to the temperature of the inner cavity of the oven. Therefore, a temperature detection module disposed in the inner cavity of the oven is also required to detect the temperature data of the inner cavity of the oven. The controller 3 can directly determine the temperature condition of the oven based on this temperature data. The specific type, implementation method, and installation position of the temperature detection module are not particularly limited in this application and can be implemented in the form of a temperature detection line, a temperature sensor, or a thermocouple, etc.

[0065] Specifically, considering that the controller 3 needs to perform door locking control based on the temperature data of the inner cavity of the oven, a temperature detection module can also be added to the control circuit to detect the temperature data of the inner cavity of the oven, ensuring the accuracy and reliability of the operation process of the control switch.

[0066] Please refer to Figure 4 , Figure 4 which is a wiring schematic diagram of a temperature control switch provided by the present utility model; please refer to Figure 5 , Figure 5 which is another wiring schematic diagram of a temperature control switch provided by the present utility model; as an alternative embodiment, the control switch is a temperature control switch.

[0067] It is not difficult to understand that the temperature control switch can be directly used as the control switch. The pin 1 and pin 2 of the temperature control switch are connected to the AC power supply to supply power to the entire temperature control switch. The pin 3, pin 4, and pin 5 are connected to the normally closed contacts for function expansion. The normally closed contacts keep the pin 3 and pin 4 conducting under the default state. The pin 6 and pin 7 are connected to the action contact K1. The pin 8, pin 9, and pin 10 are connected to the temperature detection module built in the temperature control switch, which can be implemented by means of a thermocouple Rt and / or a temperature sensor TC; the action contact K1 can be directly connected in series with the electromagnetic coil of the magnetic control lock. When the temperature detection module of the temperature control switch detects that the temperature inside the oven is greater than the preset value, the internal contact K1 of the temperature control switch conducts, and the coil of the magnetic control lock gets power to magnetically lock the door. If the door is not closed properly, the electromagnetic coil of the magnetic control lock will not be able to attract the door due to the large gap between it and the oven door 1. At this time, the normally closed point of the micro switch K2 connected in series with the buzzer will not be pressed by the door, and the micro switch remains in the default normally closed state, and the buzzer emits an alarm sound to remind the operator that the door is not closed properly, which can effectively prevent oxidation. The specific type and internal wiring of the temperature control switch are not particularly limited in this application. As Figure 5As shown, the temperature detection module of the temperature control switch can be implemented by using a temperature sensor TC connected in series between pin 9 and pin 10, or a thermocouple Rt can be used, and the connection of the thermocouple Rt can be set by using pin 8, pin 9 and pin 10.

[0068] Specifically, the temperature control switch can be directly used to control the magnetic door lock. The temperature control switch can detect the internal temperature of the oven in real time. When it is at a high temperature, it can effectively control the door not to be opened to avoid oxidation.

[0069] As an alternative embodiment, it further includes:

[0070] A power conversion module, with the input end connected to the AC power supply and the output end connected to the electromagnetic coil respectively, for converting the AC power supply into DC power to supply power to the electromagnetic coil.

[0071] It should be noted that considering that the working voltage of the magnetic control lock can only be a 12V DC power supply, and only a 12V DC power supply can effectively energize the electromagnetic coil in the magnetic control lock. And the oven and the control circuit itself are often directly connected to the AC power supply as the power source. Therefore, generally, a power conversion module needs to be set up to convert 220V AC power into DC power. The controller 3 or the temperature detection module and other work may also require DC power as the power source. The DC power output by the power conversion module can not only be output to the magnetic control lock, but also be output to other circuit modules in the control circuit for power supply. The specific type and implementation method of the power conversion module are not particularly limited in this application.

[0072] Specifically, considering that there are circuits in the control circuit that need to work with DC power, a power conversion module can also be added to the control circuit. The control circuit itself is directly connected to the AC power supply to meet the circuit's demand for AC power. At the same time, the power conversion module converts the AC power into DC power to meet the circuit's demand for DC power, further expanding the applicable range of the entire control circuit.

[0073] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of a power conversion module provided by the present utility model. As an alternative embodiment, the power conversion module includes:

[0074] A transformer T1, with the primary winding connected to the AC power supply;

[0075] A rectifier bridge BR1, with the input end connected to the secondary winding of the transformer T1;

[0076] A first capacitor C1, with the first end connected to the first output end of the rectifier bridge BR1 and serving as the first output end of the power conversion module, and the second end connected to the second output end of the rectifier bridge BR1 and serving as the second output end of the power conversion module.

[0077] It is not difficult to understand that the power conversion module may specifically include a transformer T1, a rectifier bridge BR1, and a first capacitor C1. The transformer T1 first steps down the received AC power to avoid the impact of excessive voltage on the entire circuit. Then, the rectifier bridge BR1 rectifies the AC power into DC power and outputs it. The first capacitor C1 is arranged between the two output terminals to further stabilize the output DC power. The specific types and parameters of the transformer T1, the rectifier bridge BR1, and the first capacitor C1 are not particularly limited in this application. For example, Figure 6 as shown, the rectifier bridge BR1 can be implemented by a bridge circuit composed of a diode D1, a diode D2, a diode D3, and a diode D4.

[0078] Specifically, through the transformer T1, the rectifier bridge BR1, and the first capacitor C1, the function of the power conversion module can be effectively realized, converting AC power into corresponding DC power, and the voltage level of the finally output DC power can be adjusted by adjusting the parameters of the transformer T1. The entire circuit structure is simple and easy to implement.

[0079] As an alternative embodiment, the power conversion module further includes:

[0080] A linear voltage regulator IC1, whose input terminal is respectively connected to the first terminal of the first capacitor C1 and the first output terminal of the rectifier bridge BR1, and the ground terminal is grounded;

[0081] A second capacitor C2, whose first terminal serves as the first output terminal of the power conversion module, and the second terminal serves as the second output terminal of the power conversion module;

[0082] A first resistor R1, whose first terminal is respectively connected to the output terminal of the linear voltage regulator IC1 and the first terminal of the second capacitor C2, and the second terminal is respectively connected to the second terminal of the second capacitor C2, the second terminal of the first capacitor C1, and the second output terminal of the rectifier bridge BR1.

[0083] It is not difficult to understand that in order to obtain accurate 12V DC power, a 12V linear voltage regulator IC1 can be further added at the output terminal of the power conversion module to stabilize the output DC power at an accurate 12V for output. At the same time, adding the second capacitor C2 and the first resistor R1 can further stabilize the output voltage and play a filtering role, improving the anti-interference ability of the output DC power. The specific types and parameters of the linear voltage regulator IC1, the second capacitor C2, and the first resistor R1 are not particularly limited in this application.

[0084] It should be noted that an LED1 connected in series with the first resistor R1 can be further added to the power conversion module. When there is a DC voltage output in the power conversion module, the LED emits light, visually and clearly indicating whether there is a DC voltage output currently. A fuse F1 and a switch S1 can also be added to the primary winding side of the transformer T1 to ensure the safety of the entire circuit and achieve a controllable power conversion process at the same time.

[0085] Specifically, the stability and accuracy of the finally output DC voltage can also be ensured by adding a linear voltage regulator IC1, a second capacitor C2 and a first resistor R1 to the power conversion module, so as to obtain a DC voltage with an accurate voltage level, which is convenient for use in a magnetic control lock, etc. The whole structure is simple and easy to implement.

[0086] To solve the above technical problems, the present utility model also provides an oven, which includes an oven door 1, an oven body and the control circuit of the oven door as described above.

[0087] It is not difficult to understand that the oven will also include a baking control circuit for controlling the baking process, etc. The control circuit of the oven door can be further connected to the baking control circuit. When the oven door 1 is in a closed state, the baking control circuit starts the baking program to ensure the closed state of the oven door 1 during the whole baking process. Specific implementation manners such as the specific materials and shapes of the oven door 1 and the oven body are not particularly limited in this application.

[0088] For the introduction of an oven provided by the present utility model, please refer to the embodiments of the control circuit of the oven door above, and the present utility model will not be elaborated here.

[0089] In this specification, the various embodiments are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0090] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0091] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control circuit for an oven door, characterized in that: include: a door lock, the door lock comprising a first component disposed on the oven door and a second component disposed on the oven body, wherein the oven door is closed when the first component and the second component are in contact; a position detection switch, disposed on the oven body, for generating a corresponding signal according to a contact state between the first component and the second component; A controller, whose input end is connected to the position detection switch, is used to determine the switch state of the oven door based on the signal generated by the position detection switch.

2. The control circuit of the oven door according to claim 1, characterized in that: The position detection switch is a proximity induction switch and / or a micro switch.

3. The control circuit of the oven door according to claim 1, characterized in that: Also includes: The prompt module connected in series with the position detection switch is used to output an alarm prompt signal when the first component and the second component are not in contact.

4. The control circuit of the oven door according to any one of claims 1 to 3, characterized in that: The door lock is a magnetically controlled lock, the electromagnetic coil is arranged in the second component, and the control circuit further comprises: A control switch, wherein the first end is connected to the first end of the electromagnetic coil, the second end is connected to the second end of the electromagnetic coil, and the control end is connected to the output end of the controller, and is used for being turned on based on the control of the controller when the oven door is closed and the temperature of the oven cavity reaches a preset value.

5. The control circuit of the oven door according to claim 4, characterized in that: Also includes: The temperature detection module is arranged in the inner cavity of the oven, and its output end is connected to the input end of the controller, so as to detect the temperature data of the inner cavity of the oven and output the temperature data to the controller.

6. The control circuit of the oven door according to claim 4, characterized in that: The control switch is a temperature control switch.

7. The control circuit of the oven door according to claim 6, characterized in that: Also includes: A power conversion module, the input end of which is connected to an AC power source, and the output end of which is respectively connected to the electromagnetic coils, is used to convert the AC power source into a DC power source to power the electromagnetic coils.

8. The control circuit of the oven door according to claim 7, characterized in that: The power conversion module comprises: A transformer, the primary winding of which is connected to an AC power source; A rectifier bridge, the input end of which is connected to the secondary winding of the transformer; A first capacitor has a first end connected to the first output end of the rectifier bridge and serving as the first output end of the power conversion module, and a second end connected to the second output end of the rectifier bridge and serving as the second output end of the power conversion module.

9. The control circuit of the oven door according to claim 8, characterized in that: The power conversion module also includes: A linear regulator, wherein the input end is respectively connected to the first end of the first capacitor and the first output end of the rectifier bridge, and the ground end is grounded; A second capacitor, a first end of which serves as a first output end of the power conversion module, and a second end of which serves as a second output end of the power conversion module; A first resistor has a first end connected to the output end of the linear regulator and the first end of the second capacitor respectively, and a second end connected to the second end of the second capacitor, the second end of the first capacitor and the second output end of the rectifier bridge respectively.

10. An oven, characterized in that: The invention comprises an oven door, an oven body and a control circuit of the oven door as claimed in any one of claims 1 to 9.

Images