Oven control circuit and oven

Abstract

The utility model relates to the technical field of ovens, and discloses an oven control circuit and an oven, in the oven control circuit, a controlled input end of a driving chip is electrically connected with a main control module and is used for accessing a control electric signal sent by the main control module; the first driving end of the driving chip is connected with the first end of the stirring fan interface, the second driving end of the driving chip is connected with the second end of the stirring fan interface to form a driving loop from the driving chip to the stirring fan, and the driving chip receives a control electric signal from the main control module to adjust the flowing direction of the driving loop. A control signal is connected to the controlled input end of the driving chip, the flowing direction of the driving loop is adjusted according to the control signal, and steering control over the stirring fan is achieved, so that the stirring fan is controlled to rotate in the first direction in the heating process of the oven, the temperature in the oven is balanced, and the heating efficiency is improved. And after heating of the oven is completed, the stirring fan is controlled to rotate in the second direction, the cooling speed is increased, and therefore the use experience of the oven is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oven technical field especially, and it is oven control circuit and oven. BACKGROUND

[0002] In the cooking process, the gas-electric oven will heat through the heating element, but the oven is a closed space, and the temperature in the oven is not balanced, which affects the cooking effect of the oven. Therefore, the stirring fan will rotate along the fixed direction during the cooking process, so that the temperature in the oven is balanced. After the cooking is completed, the temperature in the oven is high, and if the user opens the oven immediately, it is easy to cause burns and other safety problems, resulting in poor user experience of the oven. In the prior art, in order to realize rapid cooling after cooking, an exhaust fan is generally added in the oven, and the exhaust fan is started to exhaust the temperature after the cooking is completed, so as to realize rapid cooling. However, this requires the addition of an exhaust fan, which is high in cost. SUMMARY

[0003] The first technical problem solved by the utility model is to provide an oven control circuit, which effectively solves the problem of how to realize rapid cooling after cooking at low cost.

[0004] The second technical problem solved by the utility model is to provide an oven, which effectively solves the problem of how to realize rapid cooling after cooking at low cost.

[0005] The first technical problem is solved by the following technical scheme:

[0006] An oven control circuit comprises a main control module and a first control module.

[0007] The first control module comprises a stirring fan interface and a driving chip, and the driving chip has a controlled input end, a power supply end, a first driving end and a second driving end.

[0008] The controlled input end is electrically connected with the main control module and is used for connecting the control electric signal sent by the main control module; the power supply end is used for introducing a power supply to provide a working voltage for driving the stirring fan to work.

[0009] The first driving end of the driving chip is connected with the first end of the stirring fan interface, and the second driving end of the driving chip is connected with the second end of the stirring fan interface, so as to form a driving loop from the driving chip to the stirring fan. The driving chip receives the control electric signal from the main control module to adjust the flow direction of the driving loop.

[0010] The oven control circuit has the beneficial effects that: the first driving end of the driving chip is connected with the first end of the stirring fan interface, the second driving end of the driving chip is connected with the second end of the stirring fan interface, a driving loop from the driving chip to the stirring fan is formed, meanwhile, the controlled input end of the driving chip is connected with the control signal sent by the main control module, the flow direction of the driving loop is adjusted according to the control signal sent by the main control module, and the steering control of the stirring fan is realized; thus, only through the first control module, the stirring fan can be controlled to rotate in the first direction in the heating process of the oven, the temperature inside the oven is balanced, the stirring fan is controlled to rotate in the second direction after the heating of the oven is completed, the cooling speed is improved, and the use experience of the oven is improved. It can be seen that the oven control circuit of the utility model embodiment provides a hardware architecture, so that the oven model with only the stirring fan can also be quickly cooled after cooking, which helps to reduce the cost of the oven.

[0011] In one of the embodiments, the first control module further comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;

[0012] One end of the first resistor is connected with the power ground pin of the driving chip, and the other end of the first resistor is connected with one end of the second resistor, one end of the third resistor and one end of the fourth resistor respectively;

[0013] One end of the first capacitor is connected with the other end of the second resistor and the other end of the third resistor respectively and grounded; the other end of the first capacitor is connected with the other end of the fourth resistor and connected with the main control module, and is used for outputting the running current of the stirring fan to the main control module;

[0014] The model of the driving chip U1 is PN7709 or PN7705.

[0015] In one of the embodiments, the circuit further comprises a second control module, and the second control module comprises a blower interface, a fifth resistor, a sixth resistor and a first transistor;

[0016] One end of the fifth resistor is connected with the main control module and is used for connecting the driving signal of the blower; the other end of the fifth resistor is connected with one end of the sixth resistor and the first end of the first transistor respectively;

[0017] The other end of the sixth resistor and the second end of the first transistor are connected and grounded;

[0018] The third end of the first transistor is connected with the first end of the blower interface.

[0019] In one of the embodiments, the circuit further comprises an air inlet control module; the air inlet control module comprises an air inlet interface, a seventh resistor, an eighth resistor, a second transistor and a first diode;

[0020] One end of the seventh resistor is connected with the main control module, and the other end of the seventh resistor is connected with one end of the eighth resistor and the first end of the second transistor respectively;

[0021] The other end of the eighth resistor is connected with the second end of the second transistor and the power supply;

[0022] The first end of the air inlet interface is connected with one end of the first diode and grounded, and the second end of the air inlet interface is connected with the third end of the second transistor and the other end of the first diode respectively.

[0023] In one of the embodiments, the circuit further comprises an air outlet control module; the air outlet control module comprises an air outlet interface, a ninth resistor, a tenth resistor, a third transistor and a second diode;

[0024] One end of the ninth resistor is connected with the main control module, and the other end of the ninth resistor is connected with one end of the tenth resistor and the first end of the third transistor respectively;

[0025] The other end of the tenth resistor is connected with the second end of the third transistor and the power supply;

[0026] The first end of the air outlet interface is connected with one end of the second diode and grounded, and the second end of the air outlet interface is connected with the third end of the third transistor and the other end of the second diode respectively.

[0027] In one of the embodiments, the circuit further comprises a temperature detection module; the temperature detection module comprises a thermistor interface, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth transistor and a second capacitor;

[0028] The first end of the thermistor interface is connected with one end of the second capacitor and grounded, and the other end of the second capacitor is connected with the main control module for outputting a voltage signal to the main control module;

[0029] The second end of the thermistor interface is connected with one end of the eleventh resistor, one end of the twelfth resistor and one end of the thirteenth resistor respectively; the other end of the eleventh resistor is connected with the other end of the second capacitor; the other end of the twelfth resistor is connected with the first end of the fourth transistor and the power supply; the other end of the thirteenth resistor is connected with the second end of the fourth transistor; the third end of the fourth transistor is connected with the main control module for inputting a control signal of the fourth transistor.

[0030] In one of the embodiments, the circuit further comprises a door lock control module; the door lock control module comprises a first door lock interface, a second door lock interface, a fourteenth resistor, a fifteenth resistor and a fifth transistor;

[0031] One end of the fourteenth resistor is connected with the master control module, and accesses the door lock control signal; the other end of the fourteenth resistor is connected with one end of the fifteenth resistor and the first end of the fifth transistor respectively;

[0032] The other end of the fifteenth resistor is connected with the second end of the fifth transistor, and is grounded.

[0033] The third end of the fifth transistor is connected with the first end of the first door lock interface and the first end of the second door lock interface respectively.

[0034] In one of the embodiments, the door lock control module further comprises a third capacitor and a sixteenth resistor;

[0035] The first end of the first door lock interface is connected with the first end of the second door lock interface, and is connected with one end of the third capacitor and one end of the sixteenth resistor;

[0036] The second end of the first door lock interface is connected with the second end of the second door lock interface, and is connected with the other end of the third capacitor, the other end of the sixteenth resistor and the power supply.

[0037] In one of the embodiments, the circuit further comprises a door lock detection module; the door lock detection module comprises a limit switch interface, a seventeenth resistor, an eighteenth resistor and a fourth capacitor;

[0038] The first end of the limit switch interface is connected with one end of the fourth capacitor, and is grounded.

[0039] The second end of the limit switch interface is connected with one end of the seventeenth resistor and one end of the eighteenth resistor respectively; the other end of the seventeenth resistor is connected with the power supply; the other end of the eighteenth resistor is connected with the other end of the fourth capacitor and the master control module respectively.

[0040] The second technical problem is solved by the following technical scheme:

[0041] An oven, comprising a stirring fan and an oven control circuit as claimed in any one of the preceding claims;

[0042] The stirring fan is located at the top and / or the side wall of the oven.

[0043] The oven control circuit is connected with the stirring fan, and the oven control circuit is used for controlling the stirring fan to operate. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0045] Figure 1 It is a structure schematic view of a kind of oven control circuit of the utility model embodiment;

[0046] Figure 2 It is a circuit schematic view of the first control module in a kind of oven control circuit of the utility model embodiment;

[0047] Figure 3 It is a circuit schematic view of the second control module in a kind of oven control circuit of the utility model embodiment;

[0048] Figure 4 It is a circuit schematic view of the air inlet control module in a kind of oven control circuit of the utility model embodiment;

[0049] Figure 5 It is a circuit schematic view of the exhaust port control module in a kind of oven control circuit of the utility model embodiment;

[0050] Figure 6 It is a circuit schematic view of the temperature detection module in a kind of oven control circuit of the utility model embodiment;

[0051] Figure 7 It is a circuit schematic view of the door lock control module in a kind of oven control circuit of the utility model embodiment;

[0052] Figure 8 It is a circuit schematic view of the door lock detection module in a kind of oven control circuit of the utility model embodiment.

[0053] Mark explanation:

[0054] 1, main control module;2, first control module. Specific implementation

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0056] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0057] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0058] In the description of the present application, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] As described in the background, at present, the gas-electric oven will heat through the heating element during the cooking process, but the oven is a closed space, which is easy to cause uneven temperature in the oven, affecting the cooking effect of the oven, therefore, a stirring fan will be used during the cooking process to rotate along a fixed direction, so as to balance the temperature in the oven. After the cooking is completed, the temperature in the oven is relatively high, if the user immediately opens the oven, it is easy to cause scalding and other safety problems, resulting in poor user experience of the oven. At the same time, the oven will release the door lock after the cooking is completed, if the user opens the oven when the cooking is completed and the cooling has not been completed, it is easy to be scalded, resulting in certain safety hazards of the oven. Therefore, in order to realize the rapid cooling after the cooking is completed, an exhaust fan is generally added in the oven, and the exhaust fan is started to exhaust the temperature after the cooking is completed, so as to realize the rapid cooling. However, this needs to add the exhaust fan, which has high cost.

[0060] Based on this, the utility model provides a kind of oven control circuit, the first drive end of driving chip is connected with the first end of stirring fan interface, the second drive end of driving chip is connected with the second end of stirring fan interface, the drive loop of driving chip to stirring fan is formed, simultaneously, the controlled input end of driving chip is accessed control signal sent by main control module, according to the control signal sent by main control module adjustment drive loop's flow direction, realize the steering control of stirring fan;Therefore, only by first control module, it can be simultaneously realized in oven heating process control stirring fan rotates according to first direction, the function that makes oven internal temperature equalization, and after oven heating is completed control stirring fan rotates according to second direction, the function of improving cooling speed, to improve the use experience of oven.Visibly, the oven control circuit of the utility model embodiment provides a kind of hardware architecture, so that only the oven model equipped with stirring fan can also be cooled quickly after cooking, help to reduce oven cost.

[0061] The embodiments of the utility model are described below in conjunction with Figures 1 to 8 .

[0062] According to the embodiments of the utility model, on the one hand, an oven control circuit is provided. Figure 1 As shown in Figure 1 , the oven control circuit includes: a main control module 1 and a first control module 2; the main control module 1 is connected with the first control module 2. Among them, the main control module 1 is taken as the control core of the oven control circuit, controls the work of the first control module 2; the first control module 2 is connected with stirring fan, is used to control the work of stirring fan, for example, control whether stirring fan runs, and control the steering of stirring fan.

[0063] In the embodiment, Figure 2 As shown in Figure 1 , the first control module 2 includes stirring fan interface CN1 and driving chip U1. Among them, stirring fan interface CN1 is connected with stirring fan;Driving chip U1 is used to control the steering of stirring fan.

[0064] In this embodiment, the driving chip U1 has a controlled input end, a power supply end, a first driving end (corresponding to the OUT1 pin) and a second driving end (corresponding to the OUT2 pin). The controlled input end of the driving chip U1 is electrically connected with the master control module 1, and is used to input the control signal sent by the master control module 1; the control signal is a high-level signal or a low-level signal. The power supply end is used to introduce a power supply to provide a working voltage for driving the stirring fan to work. The first driving end of the driving chip U1 is connected with the first end of the stirring fan interface CN1, and the second driving end of the driving chip U1 is connected with the second end of the stirring fan interface CN1, so as to form a driving loop from the driving chip U1 to the stirring fan. The driving chip U1 receives the control signal from the master control module 1 to adjust the flow direction of the driving loop, so as to control the turning direction of the stirring fan.

[0065] Exemplarily, referring to Figure 2 When the driving chip U1 drives the stirring fan to rotate forward, the current is output from the first driving end (corresponding to the OUT1 pin) to the first end of the stirring fan interface CN1, and the second driving end (corresponding to the OUT2 pin) receives the current output from the second end of the stirring fan interface CN1. For the stirring fan, the current direction is from the first end of the stirring fan interface CN1 to the second end of the stirring fan interface CN1, so as to make the stirring fan rotate forward. When the driving chip U1 drives the stirring fan to rotate reversely, the current is output from the second driving end (corresponding to the OUT2 pin) to the second end of the stirring fan interface CN1, and the first driving end (corresponding to the OUT1 pin) receives the current output from the first end of the stirring fan interface CN1. For the stirring fan, the current direction is from the second end of the stirring fan interface CN1 to the first end of the stirring fan interface CN1, so as to make the stirring fan rotate reversely.

[0066] In one embodiment, as Figure 2As shown, the driving chip U1 includes two controlled inputs, i.e., a first controlled input (corresponding to the IN1 pin) and a second controlled input (corresponding to the IN2 pin); the first controlled input is connected to the first control electrical signal (MT_IN1 signal) sent by the master control module 1, and the second controlled input is connected to the second control electrical signal (MT_IN2 signal) sent by the master control module 1. One of the first control electrical signal (MT_IN1 signal) and the second control electrical signal (MT_IN2 signal) is a high-level control signal, and the other is a low-level control signal. According to the high / low level of the first control electrical signal and the second control electrical signal, the flow direction of the driving circuit from the driving chip U1 to the stirring fan is different, thereby driving the stirring fan to operate in different directions. For example, when the first control electrical signal is a high-level control signal and the second control point signal is a low-level control signal, the driving circuit from the driving chip U1 to the stirring fan is the first driving end-stirring fan interface CN1 first end-stirring fan-stirring fan interface CN1 second end-second driving end, and at this time the stirring fan rotates in the first direction; when the first control electrical signal is a low-level control signal and the second control electrical signal is a high-level signal, the driving circuit from the driving chip U1 to the stirring fan is the second driving end-stirring fan interface CN1 second end-stirring fan-stirring fan interface CN1 first end-first driving end, and at this time the stirring fan rotates in the second direction.

[0067] In one embodiment, if the first control electrical signal (MT_IN1 signal) and the second control electrical signal (MT_IN2 signal) are both low-level control signals, the driving chip U1 stops driving the stirring fan, and the stirring fan stops working.

[0068] In one embodiment, as shown, Figure 2 The first control module 2 further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1. One end of the first resistor R1 is connected to the power ground pin (CS pin) of the driving chip U1, and the other end of the first resistor R1 is respectively connected to one end of the second resistor R2, one end of the third resistor R3, and one end of the fourth resistor R4. One end of the first capacitor C1 is respectively connected to the other end of the second resistor R2 and the other end of the third resistor R3 and grounded; the other end of the first capacitor C1 is connected to the other end of the fourth resistor R4 and connected to the master control module 1, for outputting the running current of the stirring fan to the master control module 1, i.e., the fan current signal (MOT-AD signal) fed back by the master control module 1.

[0069] For example, the driving chip U1 can adopt a chip with a model number of PN7709 or PN7705.

[0070] In one embodiment, when the driving circuit from the driving chip U1 to the stirring fan is the first driving end-stirring fan interface CN1 first end-stirring fan-stirring fan interface CN1 second end-second driving end, the current flows out from the first driving end of the driving chip U1, flows into the second driving end of the driving chip U1, flows from the second driving end to the power ground pin (CS pin) inside the driving chip U1, and finally flows out from the power ground pin (CS pin). When the driving circuit from the driving chip U1 to the stirring fan is the second driving end-stirring fan interface CN1 second end-stirring fan-stirring fan interface CN1 first end-first driving end, the current flows out from the second driving end of the driving chip U1, flows into the first driving end of the driving chip U1, flows from the first driving end to the power ground pin (CS pin) inside the driving chip U1, and finally flows out from the power ground pin (CS pin). That is, no matter the flow direction of the driving circuit from the driving chip U1 to the stirring fan, no matter the rotation direction of the stirring fan, as long as the driving chip U1 drives the stirring fan to operate, the power ground pin (CS pin) of the driving chip U1 has current flowing out; therefore, when the stirring fan operates, the operating current of the stirring fan can be obtained by detecting the current of the first resistor R1 and the fourth resistor R4 connected to the power ground pin (CS pin).

[0071] In one embodiment, as shown in Figure 2 The first control module 2 further includes a nineteenth resistor R19 and a twentieth resistor R20. One end of the nineteenth resistor R19 and one end of the twentieth resistor R20 are connected to the state detection pin (FAULT pin) of the driving chip U1, the other end of the nineteenth resistor R19 is connected to the main control module 1, and the fan operating state (MT_FA signal) is fed back to the main control module 1. The other end of the twentieth resistor R20 is connected to the +5V power supply. When the driving chip U1 and the stirring fan operate normally, the MT_FA signal is pulled high to a high level by the twentieth resistor R20; when the driving chip U1 has abnormal conditions such as under-voltage, over-temperature, or short circuit, causing the stirring fan to not operate normally, the MT_FA signal is pulled low to a low level.

[0072] In one embodiment, as shown in Figure 2As shown in the figure, the first control module 2 further comprises a twenty-first resistor R21 and a twenty-second resistor R22. One end of the twenty-first resistor R21 is connected with the master control module 1 and inputs a first control signal (MT_IN1 signal), and the other end of the twenty-first resistor R21 is connected with a first input pin (IN1 pin) of the driving chip U1, and the twenty-first resistor R21 plays a role of current limiting protection. One end of the twenty-second resistor R22 is connected with the master control module 1 and inputs a second control signal (MT_IN2 signal), and the other end of the twenty-second resistor R22 is connected with a second input pin (IN2 pin) of the driving chip U1, and the twenty-second resistor R22 plays a role of current limiting protection.

[0073] In one embodiment, as Figure 2 shown in the figure, the first control module 2 further comprises a fifth capacitor C5 and a sixth capacitor C6, and the fifth capacitor C5 and the sixth capacitor C6 are used for filtering the power supply input to the driving chip U1. One end of the fifth capacitor C5 and one end of the sixth capacitor C6 are connected with a power supply pin (VCC pin) of the driving chip U1 and are connected with a +12V power supply, and the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are grounded. Wherein, the fifth capacitor C5 can be an electrolytic capacitor.

[0074] In one embodiment, as Figure 2 shown in the figure, the first control module 2 further comprises a twenty-third resistor R23 and a seventh capacitor C7, and the twenty-third resistor R23 and the seventh capacitor C7 play a role of protecting the stirring fan interface CN1. A first end of the stirring fan interface CN1 is connected with one end of the twenty-third resistor R23, the other end of the twenty-third resistor R23 is connected with one end of the seventh capacitor C7, and the other end of the seventh capacitor C7 is connected with a second end of the stirring fan interface CN1.

[0075] In one embodiment, Figure 3 a circuit schematic diagram of the second control module in the oven control circuit of the utility model embodiment, as Figure 3As shown, the second control module comprises a blower interface CN2, a fifth resistor R5, a sixth resistor R6 and a first transistor Q1. One end of the fifth resistor R5 is connected with the main control module 1, for inputting a driving signal (FAN_IN signal) of the blower; the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6 and the first end of the first transistor Q1 respectively; the fifth resistor R5 is used for protecting the first transistor Q1 from being broken down. The other end of the sixth resistor R6 and the second end of the first transistor Q1 are connected and grounded; the third end of the first transistor Q1 is connected with the first end of the blower interface CN2. When the driving signal (FAN_IN signal) of the blower is not input to the control circuit or is at a low level, the first end of the first transistor Q1 is pulled to a low level by the sixth resistor R6, the first transistor Q1 is cut off, at this time, the blower interface CN2 does not receive the signal for driving the blower to open, and the blower does not work; when the driving signal (FAN_IN signal) of the blower is input to the control circuit or is at a high level, the first end of the first transistor Q1 is pulled to a high level, the first transistor Q1 is turned on, at this time, the blower interface CN2 receives the signal for driving the blower to open, and the blower works.

[0076] In one embodiment, the first transistor Q1 can be a MOS tube. Correspondingly, the first end of the first transistor Q1 corresponds to the gate of the MOS tube, the second end of the first transistor Q1 corresponds to the source of the MOS tube, and the third end of the first transistor Q1 corresponds to the drain of the MOS tube.

[0077] In one embodiment, the second control module further comprises a twenty-fourth resistor R24, an eighth capacitor C8 and a third diode D3, and the twenty-fourth resistor R24, the eighth capacitor C8 and the third diode D3 play a role in protecting the blower interface CN2. The first end of the blower interface CN2 is connected with one end of the twenty-fourth resistor R24, one end of the eighth capacitor C8 and one end of the third diode D3 respectively; the second end of the blower interface CN2 is connected with the other end of the twenty-fourth resistor R24, the other end of the eighth capacitor C8 and the other end of the third diode D3 respectively, and is connected with the power supply.

[0078] In one embodiment, the oven control circuit further comprises an air inlet control module and an air outlet control module; wherein the air inlet control module and the air outlet control module are connected with the main control module 1, the air inlet control module is used for controlling the work of the air inlet, and the air outlet control module is used for controlling the work of the air outlet.

[0079] In one embodiment, Figure 4 A circuit schematic diagram of the air inlet control module in the oven control circuit of the embodiment of the utility model is as follows: Figure 4As shown, the air inlet control module comprises an air inlet interface CN3, a seventh resistor R7, an eighth resistor R8, a second transistor Q2 and a first diode D1; wherein the air inlet interface CN3 is connected with the air inlet. One end of the seventh resistor R7 is connected with the main control module 1, and the control signal (AIR_IN_B signal) of the air inlet is inputted; the other end of the seventh resistor R7 is connected with one end of the eighth resistor R8 and the first end of the second transistor Q2 respectively; the seventh resistor R7 is used for protecting the second transistor Q2 from being broken down. The other end of the eighth resistor R8 is connected with the second end of the second transistor Q2 and the power supply; the first end of the air inlet interface CN3 is connected with one end of the first diode D1 and grounded; the second end of the air inlet interface CN3 is connected with the third end of the second transistor Q2 and the other end of the first diode D1 respectively. When the control signal (AIR_IN_B signal) of the air inlet is not received, the first end of the second transistor Q2 is pulled high to the high level by the eighth resistor R8, and the second transistor Q2 is cut off; at this time, the air inlet interface CN3 does not receive the signal for driving the air inlet to open, and the air inlet is closed; when the control signal (AIR_IN_B signal) of the air inlet is received, the first end of the second transistor Q2 is pulled low to the low level, and the second transistor Q2 is turned on; the air inlet interface CN3 receives the signal for driving the air inlet to open, and the air inlet is opened.

[0080] In one embodiment, Figure 5 A circuit schematic diagram of the exhaust port control module in the oven control circuit is shown in the figure, Figure 5As shown, the exhaust port control module includes an exhaust port interface CN4, a ninth resistor R9, a tenth resistor R10, a third transistor Q3, and a second diode D2; wherein the exhaust port interface CN4 is connected with the exhaust port. One end of the ninth resistor R9 is connected with the main control module 1, and the control signal (AIR_OUT_B signal) of the exhaust port is inputted into the ninth resistor R9. The other end of the ninth resistor R9 is connected with one end of the tenth resistor R10 and the first end of the third transistor Q3 respectively; the ninth resistor R9 is used for protecting the third transistor Q3 from being broken down. The other end of the tenth resistor R10 is connected with the second end of the third transistor Q3 and the power supply. The first end of the exhaust port interface CN4 is connected with one end of the second diode D2 and grounded. The second end of the exhaust port interface CN4 is connected with the third end of the third transistor Q3 and the other end of the second diode D2 respectively. When the control signal (AIR_OUT_B signal) of the exhaust port is not received, the first end of the third transistor Q3 is pulled to high level by the ninth resistor R9, and the third transistor Q3 is cut off. At this time, the exhaust port interface CN4 does not receive the signal for driving the exhaust port to open, and the exhaust port is closed. When the control signal (AIR_OUT_B signal) of the exhaust port is received, the first end of the third transistor Q3 is pulled to low level, and the third transistor Q3 is turned on. The exhaust port interface CN4 receives the signal for driving the exhaust port to open, and the exhaust port is opened.

[0081] In one embodiment, the second transistor Q2 and the third transistor Q3 can be MOS tubes. Correspondingly, the first end of the second transistor Q2 and the first end of the third transistor Q3 correspond to the gate of the MOS tube, the second end of the second transistor Q2 and the second end of the third transistor Q3 correspond to the source of the MOS tube, and the third end of the second transistor Q2 and the third end of the third transistor Q3 correspond to the drain of the MOS tube.

[0082] In one specific embodiment, in actual application, during the heating process of the oven, the main control module 1 controls each module as follows:

[0083] For the first control module 2: the first control signal (MT_IN1 signal) at high level and the second control signal (MT_IN2 signal) at low level are sent to the driving chip U1. The driving circuit of the driving chip U1 to the stirring fan is the first driving end-first end of the stirring fan interface CN1-stirring fan-second end of the stirring fan interface CN1-second driving end, which controls the stirring fan to rotate in the forward direction, so as to balance the temperature in the oven.

[0084] For the second control module: the driving signal (FAN_IN signal) of the fan is sent, which controls the fan to rotate.

[0085] For the air inlet control module: send the control signal (AIR_IN_B signal) of the air inlet, control the air inlet to open, use the rotation of the blower to make air enter the oven interior, ensure that there is enough oxygen during the heating process, and make the gas fully burn.

[0086] In a specific embodiment, in actual application, during the cooling process after the heating of the oven is completed, the main control module 1 controls the modules as follows:

[0087] For the first control module 2: send the first control electrical signal (MT_IN1 signal) of low level and the second control electrical signal (MT_IN2 signal) of high level to the driving chip U1, and the driving circuit of the driving chip U1 to the stirring fan is the second driving end-stirring fan interface CN1 second end-stirring fan-stirring fan interface CN1 first end-first driving end, control the stirring fan to reverse.

[0088] For the second control module: send the driving signal (FAN_IN signal) of the blower, control the rotation of the blower.

[0089] For the air inlet control module: send the control signal (AIR_IN_B signal) of the air inlet, control the air inlet to open, use the rotation of the blower to make air enter the oven interior, ensure that there is enough oxygen during the heating process, and make the gas fully burn.

[0090] For the air outlet control module: send the control signal (AIR_OUT_B signal) of the air outlet, control the air outlet to open, use the stirring fan to reverse to discharge heat, and realize rapid cooling.

[0091] In an embodiment, the oven control circuit further comprises a temperature detection module connected with the main control module 1, used for detecting the temperature in the oven. Figure 6 As shown in the circuit schematic view of the temperature detection module in the oven control circuit of the utility model embodiment, Figure 6 The temperature detection module comprises a thermistor interface CN5, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourth transistor Q4 and a second capacitor C2; wherein the thermistor interface CN5 is connected with a thermistor, the resistance value of the thermistor changes with temperature, so as to determine the temperature in the oven according to the resistance value change of the thermistor.

[0092] In one embodiment, the first end of the thermistor interface CN5 is connected with one end of the second capacitor C2 and grounded; the other end of the second capacitor C2 is connected with the master control module 1, and outputs a voltage signal (BOX_TEMP_AD signal). The second end of the thermistor interface CN5 is connected with one end of the eleventh resistor R11, one end of the twelfth resistor R12 and one end of the thirteenth resistor R13 respectively; the other end of the eleventh resistor R11 is connected with the other end of the second capacitor C2; the other end of the twelfth resistor R12 is connected with the first end of the fourth transistor Q4 and the power supply; the other end of the thirteenth resistor R13 is connected with the second end of the fourth transistor Q4; the third end of the fourth transistor Q4 is connected with the master control module 1, and a control signal (BOX_TEMP_LEVEL signal) of the fourth transistor Q4 is input. The master control module 1 determines the temperature in the oven according to the voltage signal (BOX_TEMP_AD signal).

[0093] In one embodiment, considering that the voltage changes less when the temperature continues to rise in the case of high temperature, the master control module 1 obtains the voltage signal (BOX_TEMP_AD signal), and if the voltage signal (BOX_TEMP_AD signal) is less than a preset voltage or the temperature value corresponding to the voltage signal (BOX_TEMP_AD signal) is less than a preset temperature, outputs the control signal (BOX_TEMP_LEVEL signal) to make the triode conductive, the twelfth resistor R12 and the thirteenth resistor R13 are connected in parallel, so as to amplify the output voltage of the second end of the thermistor interface CN5, and improve the accuracy of temperature detection.

[0094] In one embodiment, the fourth transistor Q4 can be a triode. Correspondingly, the first end of the fourth transistor Q4 corresponds to the collector of the triode, the second end of the fourth transistor Q4 corresponds to the emitter of the triode, and the third end of the fourth transistor Q4 corresponds to the base of the triode.

[0095] In one embodiment, the oven control circuit further comprises a door lock control module; the door lock control module is connected with the master control module 1 and is used for controlling the opening and closing of the oven door. Figure 7 The circuit schematic diagram of the door lock control module in the oven control circuit of the embodiment of the utility model is shown in the following figure, Figure 7As shown, the door lock control module includes a first door lock interface CN6, a second door lock interface CN7, a fourteenth resistor R14, a fifteenth resistor R15, and a fifth transistor Q5; wherein the first door lock interface CN6 is connected to the first door lock, and the second door lock interface CN7 is connected to the second door lock. One end of the fourteenth resistor R14 is connected to the master control module 1, and inputs the door lock control signal (DOOR_LCOK signal); the fourteenth resistor R14 is used for protecting the fifth transistor Q5, so as to avoid the fifth transistor Q5 from being broken down. The other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15 and the first end of the fifth transistor Q5; the other end of the fifteenth resistor R15 is connected to the second end of the fifth transistor Q5 and grounded; the third end of the fifth transistor Q5 is connected to the first end of the first door lock interface CN6 and the first end of the second door lock interface CN7. When the door lock control signal (DOOR_LCOK signal) is not received, the first end of the fifth transistor Q5 is pulled low to a low level by the fifteenth resistor R15, the fifth transistor Q5 is cut off, the first door lock interface CN6 and the second door lock interface CN7 do not receive the door lock control signal, and the first door lock and the second door lock are not locked; when the door lock control signal (DOOR_LCOK signal) is received, the first end of the fifth transistor Q5 is pulled high to a high level, the fifth transistor Q5 is turned on, the first door lock interface CN6 and the second door lock interface CN7 receive the door lock control signal, and the first door lock and the second door lock are locked.

[0096] In one embodiment, the fifth transistor Q5 can be a MOS tube. Correspondingly, the first end of the fifth transistor Q5 corresponds to the gate of the MOS tube, the second end of the fifth transistor Q5 corresponds to the source of the MOS tube, and the third end of the fifth transistor Q5 corresponds to the drain of the MOS tube.

[0097] In one embodiment, the door lock control module further includes a third capacitor C3 and a sixteenth resistor R16, and the third capacitor C3 and the sixteenth resistor R16 are used for protecting the first door lock interface CN6 and the second door lock interface CN7. The first end of the first door lock interface CN6 is connected to the first end of the second door lock interface CN7, and is connected to one end of the third capacitor C3 and one end of the sixteenth resistor R16; the second end of the first door lock interface CN6 is connected to the second end of the second door lock interface CN7, and is connected to the other end of the third capacitor C3, the other end of the sixteenth resistor R16, and a power supply.

[0098] In one embodiment, when the oven starts heating, the master module 1 outputs a high level door lock control signal (DOOR_LOCK signal), the first door lock and the second door lock are locked, and the user cannot open the oven door; after the oven heating is completed and the temperature is reduced to the set temperature value at which the door can be opened, the master module 1 stops outputting the door lock control signal (DOOR_LOCK signal), the first door lock and the second door lock are opened, and the user can open the oven door. Thus, the oven door is locked during the heating process and the cooling process, avoiding the situation that the user opens the oven door and is scalded by high temperature, and improving the safety of the oven.

[0099] In one embodiment, the oven control circuit further comprises a door lock detection module; the door lock detection module is connected with the master module 1 and is used to feed back the door lock closing condition to the master module 1, so that the master module 1 controls the heating work of the oven. Figure 8 The circuit schematic diagram of the door lock detection module in the oven control circuit of the embodiment of the utility model is shown as Figure 8 The door lock detection module comprises a limit switch interface CN8, a seventeenth resistor R17, an eighteenth resistor R18 and a fourth capacitor C4; wherein the limit switch interface CN8 is connected with a limit switch. The first end of the limit switch interface CN8 is connected with one end of the fourth capacitor C4 and grounded; the second end of the limit switch interface CN8 is connected with one end of the seventeenth resistor R17 and one end of the eighteenth resistor R18 respectively; the other end of the seventeenth resistor R17 is connected with a power supply; the other end of the eighteenth resistor R18 is connected with the other end of the fourth capacitor C4 and the master module 1 respectively and sends a door lock state detection signal (DOOR_DETECT signal) to the master module 1. When the first door lock and the second door lock are opened or the limit switch is abnormal, the seventeenth resistor R17 pulls the second end of the limit switch interface CN8 to high level, the output door lock state detection signal (DOOR_DETECT signal) is high level, and the master module 1 sets the oven to not start heating to avoid the oven starting heating when the oven door is opened; when the first door lock and the second door lock are closed and the limit switch works normally, the second end of the limit switch interface CN8 is pulled to low level, the output door lock state detection signal (DOOR_DETECT signal) is low level, and the master module 1 sets the oven to start heating.

[0100] According to the embodiment of the utility model, on the other hand, an oven is also provided, which comprises a stirring fan and the oven control circuit of any one of the above embodiments; wherein the stirring fan is located at the top and / or side wall of the oven; the oven control circuit is connected with the stirring fan, and the oven control circuit is used to control the stirring fan to operate.

[0101] In one embodiment, the oven further comprises a blower located at the bottom of the oven; the oven control circuit is connected with the blower for controlling the operation of the blower.

[0102] In one embodiment, the stirring blower is connected with the oven control circuit through a stirring blower interface CN1 in the oven control circuit, and the blower is connected with the oven control circuit through a blower interface CN2 in the oven control circuit.

[0103] In one embodiment, the oven further comprises an air inlet and an air outlet, the air inlet is connected with the oven control circuit through an air inlet interface CN3, and the air outlet is connected with the oven control circuit through an air outlet interface CN4. The air inlet is arranged at the bottom of the oven, so that the blower can deliver air into the oven through the air inlet; the air outlet is arranged at the same position as the stirring blower, so that the air in the oven can be discharged when the stirring blower reverses.

[0104] In the specific contents of the above specific embodiments, any non-contradictory combination of technical features can be made, in order to make the description simple, not all possible combinations of the above technical features are described, however, as long as the combination of these technical features does not exist, it should be considered as the scope of the description.

[0105] The specific contents of the above specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model.

Claims

1. An oven control circuit, characterized by The circuit comprises a master control module (1) and a first control module (2); The first control module (2) comprises a stirring fan interface CN1 and a driving chip U1, and the driving chip U1 is provided with a controlled input end, a power supply end, a first driving end and a second driving end; The controlled input end is electrically connected with the master control module (1) and used for inputting a control electric signal sent by the master control module (1); and the power supply end is used for introducing a power supply to provide a working voltage for driving the stirring fan to work. The first driving end of the driving chip U1 is connected with a first end of the stirring fan interface CN1, and the second driving end of the driving chip U1 is connected with a second end of the stirring fan interface CN1, so as to form a driving loop from the driving chip U1 to the stirring fan, and the driving chip U1 receives the control electric signal from the master control module (1) to adjust the flow direction of the driving loop.

2. The circuit of claim 1, wherein, The first control module (2) further comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first capacitor C1; One end of the first resistor R1 is connected with a power ground pin of the driving chip U1, and the other end of the first resistor R1 is connected with one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4 respectively; One end of the first capacitor C1 is connected with the other end of the second resistor R2 and the other end of the third resistor R3 respectively and grounded; and the other end of the first capacitor C1 is connected with the other end of the fourth resistor R4 and the master control module (1), and used for outputting a running current of the stirring fan to the master control module (1); The model of the driving chip U1 is PN7709 or PN7705.

3. The circuit of claim 1, wherein, The circuit further comprises a second control module, and the second control module comprises a blower fan interface CN2, a fifth resistor R5, a sixth resistor R6 and a first transistor Q1; One end of the fifth resistor R5 is connected with the master control module (1) and used for inputting a driving signal of the blower fan; and the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6 and a first end of the first transistor Q1 respectively; The other end of the sixth resistor R6 and a second end of the first transistor Q1 are connected and grounded; A third end of the first transistor Q1 is connected with a first end of the blower fan interface CN2.

4. The circuit of claim 1, wherein, The circuit further comprises an air inlet control module, and the air inlet control module comprises an air inlet interface CN3, a seventh resistor R7, an eighth resistor R8, a second transistor Q2 and a first diode D1; One end of the seventh resistor R7 is connected with the master control module (1), and the other end of the seventh resistor R7 is connected with one end of the eighth resistor R8 and a first end of the second transistor Q2 respectively; The other end of the eighth resistor R8 is connected with a second end of the second transistor Q2 and a power supply. The first end of the air inlet interface CN3 is connected with one end of the first diode D1 and grounded; the second end of the air inlet interface CN3 is connected with the third end of the second transistor Q2 and the other end of the first diode D1 respectively.

5. The circuit of claim 1, wherein, The circuit further comprises an air outlet control module; the air outlet control module comprises an air outlet interface CN4, a ninth resistor R9, a tenth resistor R10, a third transistor Q3 and a second diode D2; One end of the ninth resistor R9 is connected with the main control module (1), and the other end of the ninth resistor R9 is connected with one end of the tenth resistor R10 and the first end of the third transistor Q3 respectively; The other end of the tenth resistor R10 is connected with the second end of the third transistor Q3 and a power supply; The first end of the air outlet interface CN4 is connected with one end of the second diode D2 and grounded; the second end of the air outlet interface CN4 is connected with the third end of the third transistor Q3 and the other end of the second diode D2 respectively.

6. The circuit of claim 1, wherein, The circuit further comprises a temperature detection module; the temperature detection module comprises a thermistor interface CN5, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourth transistor Q4 and a second capacitor C2; The first end of the thermistor interface CN5 is connected with one end of the second capacitor C2 and grounded; the other end of the second capacitor C2 is connected with the main control module (1) for outputting a voltage signal to the main control module (1); The second end of the thermistor interface CN5 is connected with one end of the eleventh resistor R11, one end of the twelfth resistor R12 and one end of the thirteenth resistor R13 respectively; the other end of the eleventh resistor R11 is connected with the other end of the second capacitor C2; the other end of the twelfth resistor R12 is connected with the first end of the fourth transistor Q4 and a power supply; the other end of the thirteenth resistor R13 is connected with the second end of the fourth transistor Q4; the third end of the fourth transistor Q4 is connected with the main control module (1) for inputting a control signal of the fourth transistor Q4.

7. The circuit of claim 1, wherein, The circuit further comprises a door lock control module; the door lock control module comprises a first door lock interface CN6, a second door lock interface CN7, a fourteenth resistor R14, a fifteenth resistor R15 and a fifth transistor Q5; One end of the fourteenth resistor R14 is connected with the main control module (1) for inputting a door lock control signal; the other end of the fourteenth resistor R14 is connected with one end of the fifteenth resistor R15 and the first end of the fifth transistor Q5 respectively; The other end of the fifteenth resistor R15 is connected with the second end of the fifth transistor Q5 and grounded; The third end of the fifth transistor Q5 is connected with the first end of the first door lock interface CN6 and the first end of the second door lock interface CN7 respectively.

8. The circuit of claim 7, wherein, The door lock control module further comprises a third capacitor C3 and a sixteenth resistor R16; The first end of the first door lock interface CN6 is connected with the first end of the second door lock interface CN7, and with one end of the third capacitor C3 and one end of the sixteenth resistor R16; The second end of the first door lock interface CN6 is connected with the second end of the second door lock interface CN7, and with the other end of the third capacitor C3, the other end of the sixteenth resistor R16 and the power supply.

9. The circuit of claim 1, wherein, The circuit further comprises a door lock detection module; the door lock detection module comprises a limit switch interface CN8, a seventeenth resistor R17, an eighteenth resistor R18 and a fourth capacitor C4; The first end of the limit switch interface CN8 is connected with one end of the fourth capacitor C4 and grounded; The second end of the limit switch interface CN8 is respectively connected with one end of the seventeenth resistor R17 and one end of the eighteenth resistor R18; the other end of the seventeenth resistor R17 is connected with the power supply; the other end of the eighteenth resistor R18 is respectively connected with the other end of the fourth capacitor C4 and the main control module (1).

10. An oven, characterized in that The oven control circuit according to any one of claims 1-9; and a stirring fan. The stirring fan is located at the top and / or side wall of the oven. The oven control circuit is connected with the stirring fan, and the oven control circuit is used for controlling the stirring fan to operate.

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