Cooking equipment

Abstract

The utility model discloses cooking equipment. The cooking equipment comprises a microwave generation module, a door switch, a first signal control circuit, a second signal control circuit, a third signal control circuit, a relay, a first power supply, a second power supply and a main control board, the second end of the door switch is connected with a first signal control circuit, a second signal control circuit and a relay, the first signal control circuit is connected with a second power supply, the first signal control circuit is used for detecting an on-off signal of the door switch and sending the signal to the main control board, and the second signal control circuit is connected with a PWM port of the main control board. The third signal control circuit is connected in series to the circuit where the relay and the door switch are located, the third signal control circuit is connected with the main control board, and the relay is installed in the circuit of the microwave generation module and used for controlling the on-off of the microwave generation module.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a cooking device. Background Art

[0002] When the microwave oven controls the opening and closing of the microwave generation module, the user cannot perceive whether the microwave is turned on or off. If the magnetron of the microwave generation module emits microwaves and the microwave heating cavity is not closed (i.e., the door of the microwave oven is open), microwave radiation will be generated to the outside. For example, if it radiates biological cells, it will cause lesions. Therefore, there are various protection circuits for microwave control. The national standard requires adding an interlocking microswitch at the front end of the power supply to the magnetron. When the microwave function is running in the microwave heating cavity, when the user operates to open the door instantaneously, the microwave power supply will be cut off. The conventional control process is that after the main control board detects that the door is opened, the main control board then outputs a control signal to disconnect the relay. However, this cannot prevent the out-of-control problem caused by errors in the internal program of the main control board, and the control of the microwave module is not stable and effective enough.

[0003] Therefore, there is an urgent need for a cooking device to solve the above problems. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the problems existing in the related art to a certain extent. For this purpose, the utility model provides a cooking device. On the one hand, it can ensure that when the door of the cooking device is open or the program of the main control board has an error, the microwave generation module in the cooking device will not work, avoiding microwave radiation to the user and having high safety. On the other hand, by using a separate first power supply for the series circuit where the door switch and the relay are located, and a separate second power supply for the circuit where the main control board is located, voltage division control of the circuit where the relay is located and the circuit where the main control board is located is realized, which is conducive to flexibly using different specifications of relays and main control boards and reducing costs.

[0005] The above object is achieved by the following technical solutions:

[0006] A cooking device, comprising a microwave generation module, a door switch, a first signal control circuit, a second signal control circuit, a third signal control circuit, a relay, a first power supply, a second power supply and a main control board. The first end of the door switch is connected to the first power supply, the second end of the door switch is connected to the first signal control circuit, the second signal control circuit and the relay. The first signal control circuit is connected to the second power supply. The first signal control circuit is used to detect the on / off signal of the door switch and send this signal to the main control board. The second signal control circuit is connected to the PWM port of the main control board and is used to control the on / off of the circuit between the relay and the door switch. The third signal control circuit is connected in series in the circuit where the relay and the door switch are located. The third signal control circuit is connected to the main control board. The relay is installed in the circuit of the microwave generation module and is used to control the on / off of the microwave generation module.

[0007] Optionally, the first signal control circuit includes a first diode, a first resistor and a second resistor. One end of the first resistor is connected to the door switch, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is grounded, one end of the first diode is connected to the second power supply, and the other end is connected between the first resistor and the second resistor and is connected to the main control board.

[0008] Optionally, the second signal control circuit includes a MOS transistor, a first triode, a filter circuit, a first charge-discharge circuit and a second diode. The first end of the MOS transistor is connected to the second end of the door switch, the second end of the MOS transistor is connected to the first end of the first triode, the third end of the MOS transistor is connected to the first end of the relay. The second end of the first triode is connected to the first end of the second diode through the filter circuit, the third end of the first triode is grounded, the second end of the second diode is connected to the PWM port of the main control board through the first charge-discharge circuit, and the third end of the second diode is grounded.

[0009] Optionally, the filter circuit includes a third resistor, a fourth resistor and a filter capacitor. The first end of the third resistor is connected to the second end of the first triode, the second end of the third resistor is connected to the first end of the second diode, the first end of the fourth resistor is connected between the third resistor and the first triode, the second end of the fourth resistor is grounded, the first end of the filter capacitor is connected between the third resistor and the second diode, and the second end of the filter capacitor is grounded.

[0010] Optionally, the first charge and discharge circuit includes a fifth resistor and a first charging capacitor. The first end of the fifth resistor is connected to the second end of the second diode. The second end of the fifth resistor is connected to the first end of the first charging capacitor. The second end of the first charging capacitor is connected to the PWM port of the main control board.

[0011] Optionally, it further includes a sixth resistor and a seventh resistor. The first end of the sixth resistor is connected to the second end of the gate switch. The second end of the sixth resistor is connected to the first end of the seventh resistor. The second end of the seventh resistor is connected to the first end of the first triode. The second end of the MOS tube is connected between the sixth resistor and the seventh resistor.

[0012] Optionally, the second signal control circuit includes a second triode, a second filter circuit, a third triode, and a second charge and discharge circuit. The first end of the second triode is connected to the second end of the gate switch. The second end of the second triode is connected to the first end of the third triode. The third end of the second triode is connected to the relay. The second end of the third triode is connected to the first end of the second charge and discharge circuit. The third end of the third triode is grounded. The second end of the second charge and discharge circuit is connected to the PWM port of the main control board. The first end of the third diode is connected between the second end of the gate switch and the first end of the second triode. The second end of the third diode is connected between the second end of the second triode and the first end of the third triode.

[0013] Optionally, it further includes an eighth resistor. The first end of the eighth resistor is connected to the second end of the third diode. The second end of the eighth resistor is connected to the first end of the third triode.

[0014] Optionally, the second charge and discharge circuit includes a ninth resistor and a second charging capacitor. The first end of the ninth resistor is connected to the second end of the third triode. The second end of the ninth resistor is connected to the first end of the second charging capacitor. The second end of the second charging capacitor is connected to the PWM interface of the main control board.

[0015] Optionally, the third signal control circuit includes a fourth diode and a fourth triode. The first end of the fourth triode is connected to the relay. The second end of the fourth triode is connected to the main control board. The third end of the fourth triode is grounded. The first end of the fourth diode is connected between the relay and the gate switch. The second end of the fourth diode is connected between the relay and the fourth triode.

[0016] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0017] The cooking device provided by the present utility model can, on the one hand, ensure that the microwave generating module in the cooking device does not work when the door of the cooking device is open or when an error occurs in the program of the main control board, avoiding microwave radiation to the user and having relatively high safety. On the other hand, by separately using the first power supply for the series circuit where the door switch and the relay are located, and separately using the second power supply for the circuit where the main control board is located, voltage division control of the circuit where the relay is located and the circuit where the main control board is located is achieved, which is beneficial for flexibly using relays and main control boards of different specifications and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the circuit topology diagram of the cooking device provided in the first specific embodiment of the present utility model;

[0019] Figure 2 is the circuit topology diagram of the cooking device provided in the second specific embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following embodiments are used to illustrate the present utility model, but the present utility model is not limited by these embodiments. Modifying the specific implementation manner of the present utility model or equivalently replacing some technical features without departing from the spirit of the solution of the present utility model shall be covered within the scope of the technical solution claimed by the present utility model.

[0021] Embodiment 1

[0022] Please refer to Figure 1, the present utility model provides a cooking device, including a microwave generation module 2, a door switch S1, a first signal control circuit, a second signal control circuit, a third signal control circuit, a relay 3, a first power supply VCC_IN, a second power supply VDD, and a main control board. The first end of the door switch S1 is connected to the first power supply VCC_IN, and the second end of the door switch S1 is connected to the first signal control circuit, the second signal control circuit, and the relay 3. The first signal control circuit is connected to the second power supply VDD. The first signal control circuit is used to detect the on-off signal of the door switch S1 and send this signal to the main control board. The second signal control circuit is connected to the PWM port 12 of the main control board and is used to control the on-off of the circuit between the relay 3 and the door switch S1. The third signal control circuit is connected in series in the circuit where the relay 3 and the door switch S1 are located, and the third signal control circuit is connected to the main control board. The relay 3 is installed in the circuit of the microwave generation module 2 and is used to control the on-off of the microwave generation module 2. When the door switch S1 is closed, the first signal control circuit transmits a high level to the main control board, the main control board outputs a high level to the third signal control circuit, and at the same time, the main control board outputs a high level to the second signal control circuit through the PWM port 12. The circuit where the relay 3 is located is powered on, so that the relay 3 is turned on, and further the microwave generation module 2 is powered on to generate microwaves. When the door switch S1 is opened, the first signal control circuit transmits a low level to the main control board, the main control board outputs a low level to the third signal control circuit. At this time, the third signal control circuit disconnects the circuit where the relay 3 is located. At this time, even if the PWM port 12 can output a high level to the second signal control circuit, the circuit where the relay 3 is located is still in the off state, thus ensuring that when the door switch S1 is opened, that is, when the door of the cooking device is opened, the relay 3 is in the off state, and the circuit of the microwave generation module 2 is disconnected and no longer generates microwaves. And when an error occurs in the program of the main control board, the PWM port 12 does not output a signal, that is, the second signal control circuit does not obtain a high level, and further the circuit where the relay 3 is located is also in the off state, avoiding the situation that when the main control board is out of control, the door of the cooking device is opened and the relay 3 is turned on, resulting in the microwave generation module 2 continuing to work and generate microwaves.

[0023] The cooking device provided by the present utility model, on the one hand, can ensure that when the door of the cooking device is opened or an error occurs in the program of the main control board, the microwave generation module 2 in the cooking device will not work, avoiding microwave radiation to the user, and having relatively high safety. On the other hand, by using the first power supply VCC_IN alone for the series circuit where the door switch S1 and the relay 3 are located, and using the second power supply VDD alone for the circuit where the main control board is located, to achieve voltage division control of the circuit where the relay 3 is located and the circuit where the main control board is located, which is conducive to the flexible use of different specifications of relays 3 and main control boards and reduces costs.

[0024] Optionally, the first signal control circuit includes a first diode D1, a first resistor R2, and a second resistor R3. One end of the first resistor R2 is connected to the gate switch S1, the other end of the first resistor R2 is connected to one end of the second resistor R3, the other end of the second resistor R3 is grounded, one end of the first diode D1 is connected to the second power supply VDD, and the other end is connected between the first resistor R2 and the second resistor R3 and connected to the signal input port 11 of the main control board, so as to transmit the on-off signal of the gate switch S1 to the main control board in the form of high level and low level.

[0025] Optionally, the second signal control circuit includes a MOS transistor, a first triode Q1, a filter circuit, a first charge-discharge circuit, and a second diode D2. The first end of the MOS transistor is connected to the second end of the gate switch S1, the second end of the MOS transistor is connected to the first end of the first triode Q1, the third end of the MOS transistor is connected to the first end of the relay 3, the second end of the first triode Q1 is connected to the first end of the second diode D2 through the filter circuit, the third end of the first triode Q1 is grounded, the second end of the second diode D2 is connected to the PWM port 12 of the main control board through the first charge-discharge circuit, and the third end of the second diode D2 is grounded. After the main control board is powered on, it normally outputs a frequency signal to the PWM port 12, then the charge-discharge circuit outputs a signal to the second diode D2 through charge and discharge, and then passes through the filter circuit for smoothing filtering to ensure that a stable voltage is transmitted to the first triode Q1, so that the first triode Q1 is turned on, and then the MOS transistor is turned on.

[0026] Optionally, the filter circuit includes a third resistor R6, a fourth resistor R7, and a filter capacitor C2. The first end of the third resistor R6 is connected to the second end of the first triode Q1, the second end of the third resistor R6 is connected to the first end of the second diode D2, the first end of the fourth resistor R7 is connected between the third resistor R6 and the first triode Q1, the second end of the fourth resistor R7 is grounded, the first end of the filter capacitor C2 is connected between the third resistor R6 and the second diode D2, and the second end of the filter capacitor C2 is grounded.

[0027] Optionally, the first charge-discharge circuit includes a fifth resistor R5 and a first charging capacitor C1. The first end of the fifth resistor R5 is connected to the second end of the second diode D2, the second end of the fifth resistor R5 is connected to the first end of the first charging capacitor C1, and the second end of the first charging capacitor C1 is connected to the PWM port 12 of the main control board.

[0028] Optionally, it further includes a sixth resistor R1 and a seventh resistor R4. The first end of the sixth resistor R1 is connected to the second end of the gate switch S1. The second end of the sixth resistor R1 is connected to the first end of the seventh resistor R4. The second end of the seventh resistor R4 is connected to the first end of the first triode Q1. The second end of the MOS transistor is connected between the sixth resistor R1 and the seventh resistor R4. The sixth resistor R1 and the seventh resistor R4 achieve a voltage division function, so that the voltage difference between the gate and the source of the MOS transistor is greater than the maximum gate-source voltage of the MOS transistor, ensuring that the MOS transistor is turned on.

[0029] Optionally, the third signal control circuit includes a fourth diode D3 and a fourth triode Q2. The first end of the fourth triode Q2 is connected to the relay 3. The second end of the fourth triode Q2 is connected to the signal output port 13 of the main control board. The third end of the fourth triode Q2 is grounded. The first end of the fourth diode D3 is connected between the relay 3 and the gate switch S1. The second end of the fourth diode D3 is connected between the relay 3 and the fourth triode Q2.

[0030] Optionally, the microwave generation module 2 includes a magnetron 22 and a magnetron power supply module 21, which are prior arts and will not be elaborated here.

[0031] Embodiment 2

[0032] Please refer to Figure 2 , optionally, the second signal control circuit includes a second triode Q4, a third diode EC7, a third triode Q3 and a second charge and discharge circuit. The first end of the second triode Q4 is connected to the second end of the gate switch S1. The second end of the second triode Q4 is connected to the first end of the third triode Q3. The third end of the second triode Q4 is connected to the relay 3. The second end of the third triode Q3 is connected to the first end of the second charge and discharge circuit. The third end of the third triode Q3 is grounded. The second end of the second charge and discharge circuit is connected to the PWM port 12 of the main control board. The first end of the third diode EC7 is connected between the second end of the gate switch S1 and the first end of the second triode Q4. The second end of the third diode EC7 is connected between the second end of the second triode Q4 and the first end of the third triode Q3.

[0033] Optionally, it further includes an eighth resistor R10. The first end of the eighth resistor R10 is connected to the second end of the third diode. The second end of the eighth resistor R10 is connected to the first end of the third triode Q3.

[0034] Optionally, the second charge and discharge circuit includes a ninth resistor R11 and a second charging capacitor C3. The first end of the ninth resistor R11 is connected to the second end of the third triode Q3. The second end of the ninth resistor R11 is connected to the first end of the second charging capacitor C3. The second end of the second charging capacitor C3 is connected to the PWM interface of the main control board.

[0035] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the creative concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A cooking device, characterized in that, It includes a microwave generation module (2), a door switch, a first signal control circuit, a second signal control circuit, a third signal control circuit, a relay (3), a first power supply, a second power supply and a main control board. The first end of the door switch is connected to the first power supply, and the second end of the door switch is connected to the first signal control circuit, the second signal control circuit and the relay (3). The first signal control circuit is connected to the second power supply. The first signal control circuit is used to detect the on / off signal of the door switch and send this signal to the main control board. The second signal control circuit is connected to the PWM port of the main control board and is used to control the on / off of the circuit between the relay and the door switch. The third signal control circuit is connected in series to the circuit where the relay (3) and the door switch are located. The third signal control circuit is connected to the main control board. The relay (3) is installed in the circuit of the microwave generation module (2) and is used to control the on / off of the microwave generation module (2).

2. The cooking device according to claim 1, characterized in that, The first signal control circuit includes a first diode, a first resistor and a second resistor. One end of the first resistor is connected to the door switch, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is grounded, one end of the first diode is connected to the second power supply, and the other end is connected between the first resistor and the second resistor and is connected to the main control board.

3. The cooking device according to claim 1, characterized in that, The second signal control circuit includes a MOS transistor, a first triode, a filter circuit, a first charge and discharge circuit and a second diode. The first end of the MOS transistor is connected to the second end of the door switch, the second end of the MOS transistor is connected to the first end of the first triode, the third end of the MOS transistor is connected to the first end of the relay (3), the second end of the first triode is connected to the first end of the second diode through the filter circuit, the third end of the first triode is grounded, the second end of the second diode is connected to the PWM port of the main control board through the first charge and discharge circuit, and the third end of the second diode is grounded.

4. The cooking device according to claim 3, characterized in that, The filter circuit includes a third resistor, a fourth resistor and a filter capacitor. The first end of the third resistor is connected to the second end of the first triode, the second end of the third resistor is connected to the first end of the second diode, the first end of the fourth resistor is connected between the third resistor and the first triode, the second end of the fourth resistor is grounded, the first end of the filter capacitor is connected between the third resistor and the second diode, and the second end of the filter capacitor is grounded.

5. The cooking device according to claim 3, characterized in that, The first charge and discharge circuit includes a fifth resistor and a first charging capacitor. The first end of the fifth resistor is connected to the second end of the second diode, the second end of the fifth resistor is connected to the first end of the first charging capacitor, and the second end of the first charging capacitor is connected to the PWM port of the main control board.

6. The cooking device according to claim 3, characterized in that, It further includes a sixth resistor and a seventh resistor. The first end of the sixth resistor is connected to the second end of the gate switch. The second end of the sixth resistor is connected to the first end of the seventh resistor. The second end of the seventh resistor is connected to the first end of the first triode. The second end of the MOS transistor is connected between the sixth resistor and the seventh resistor.

7. The cooking device according to claim 1, wherein, The second signal control circuit includes a second triode, a third diode, a third triode, and a second charge and discharge circuit. The first end of the second triode is connected to the second end of the gate switch. The second end of the second triode is connected to the first end of the third triode. The third end of the second triode is connected to the relay (3). The second end of the third triode is connected to the first end of the second charge and discharge circuit. The third end of the third triode is grounded. The second end of the second charge and discharge circuit is connected to the PWM port of the main control board. The first end of the third diode is connected between the second end of the gate switch and the first end of the second triode. The second end of the third diode is connected between the second end of the second triode and the first end of the third triode.

8. The cooking device according to claim 7, characterized in that It further includes an eighth resistor. The first end of the eighth resistor is connected to the second end of the third diode. The second end of the eighth resistor is connected to the first end of the third triode.

9. The cooking device according to claim 7, characterized in that, The second charge and discharge circuit includes a ninth resistor and a second charging capacitor. The first end of the ninth resistor is connected to the second end of the third triode. The second end of the ninth resistor is connected to the first end of the second charging capacitor. The second end of the second charging capacitor is connected to the PWM interface of the main control board.

10. The cooking device according to any one of claims 1-9, characterized in that, The third signal control circuit includes a fourth diode and a fourth triode. The first end of the fourth triode is connected to the relay (3). The second end of the fourth triode is connected to the main control board. The third end of the fourth triode is grounded. The first end of the fourth diode is connected between the relay (3) and the gate switch. The second end of the fourth diode is connected between the relay (3) and the fourth triode.

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