CN220911504U - Door opening control circuit and microwave oven - Google Patents
Door opening control circuit and microwave oven Download PDFInfo
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- CN220911504U CN220911504U CN202322426473.5U CN202322426473U CN220911504U CN 220911504 U CN220911504 U CN 220911504U CN 202322426473 U CN202322426473 U CN 202322426473U CN 220911504 U CN220911504 U CN 220911504U
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Abstract
The utility model relates to the technical field of electromagnetic control, and discloses a door opening control circuit and a microwave oven, wherein the door opening control circuit provided by the utility model comprises: the locking driving circuit comprises a locking end which is connected with the first end of the first electromagnetic coil; the unlocking driving circuit comprises an unlocking end which is connected with the first end of the second electromagnetic coil; the power supply is provided with a power supply end, the power supply end is connected with the second end of the first electromagnetic coil, and the power supply end is connected with the second end of the second electromagnetic coil; the power regulating circuit comprises a capacitor and a first resistor, wherein the first end of the capacitor is connected with a power supply end, the second end of the capacitor is grounded, one end of the first resistor is connected with the first end of the capacitor, and the second end of the first resistor is used for being connected with a first power supply end; the input and output ports are respectively connected with the locking driving circuit and the unlocking driving circuit and are used for controlling the locking end to lock or the unlocking end to unlock according to the output control signals, so that the electromagnetic valve can be driven to work normally by the power supplied by the power supply end.
Description
Technical Field
The utility model relates to the technical field of electromagnetic control, in particular to a door opening control circuit and a microwave oven.
Background
The electronic secondary door-opening microwave oven can realize locking and unlocking functions by using electromagnetic valves widely. The electromagnetic valve consists of two coils, and can be powered by each coil independently, so that the action of a stay bar of the electromagnetic valve is controlled by controlling the power supply state of the coils, and the locking and unlocking functions are realized.
In the related art, the control unit supplies power to the coil of the electromagnetic valve, but the power supplied by the power end of the control unit is smaller than the power capable of driving the electromagnetic valve to work normally, so that if the power of the control unit is directly used for supplying power to the electromagnetic valve, the electromagnetic valve cannot work normally.
Disclosure of utility model
In view of this, the present utility model provides a door opening control circuit and a microwave oven, so as to solve the problem that the power supply of the control unit cannot drive the electromagnetic valve to work normally.
In a first aspect, the present utility model provides a door opening control circuit, comprising:
The locking driving circuit comprises a locking end which is connected with the first end of the first electromagnetic coil;
the unlocking driving circuit comprises an unlocking end which is connected with the first end of the second electromagnetic coil;
the power supply is provided with a power supply end, the power supply end is connected with the second end of the first electromagnetic coil, and the power supply end is connected with the second end of the second electromagnetic coil;
The power regulating circuit comprises a capacitor and a first resistor, wherein the first end of the capacitor is connected with a power supply end, the second end of the capacitor is grounded, one end of the first resistor is connected with the first end of the capacitor, and the second end of the first resistor is used for being connected with a first power supply end;
The microcontroller is provided with an input/output port which is respectively connected with the locking driving circuit and the unlocking driving circuit, the input/output port is used for outputting a first control signal, a second control signal or a third control signal, and the first control signal is used for driving the locking driving circuit to control the locking end to lock; the second control signal is used for driving the unlocking driving circuit to control the unlocking end to unlock, the third control signal is used for controlling the locking driving circuit to control the locking end to be in a maintenance state and controlling the unlocking driving circuit to control the unlocking end to be in a high-resistance state.
The beneficial effects are that: the locking driving circuit and the unlocking driving circuit are respectively controlled through one input/output port, so that port resources can be effectively saved. And through electric capacity and the first resistance in the power regulating circuit, can reduce the power of solenoid valve, and then make the power that the power end provided can drive solenoid valve normal operating, and then lock or unblock according to the different signal control of input/output port output, can effectively avoid appearing the unusual condition emergence of control to help reinforcing the interference killing feature of control circuit that opens the door.
In an alternative embodiment, the locking drive circuit includes:
The first control end of the first switching tube is connected with the input/output port in series through a second resistor, the first connecting end of the first switching tube is connected with the second power supply end through a third resistor, and the second connecting end of the first switching tube is grounded;
the second control end of the second switching tube is arranged between the first connecting end of the first switching tube and the third resistor, the first connecting end of the second switching tube is connected with the second power supply end through the fourth resistor, and the second connecting end of the second switching tube is connected with the third control end of the third switching tube;
the first connecting end of the third switching tube is connected with the upper locking end, and the second connecting end of the third switching tube is grounded;
the first diode is arranged between the first connecting end of the third switch tube and the power supply end.
The beneficial effects are that: the first control end of the first switching tube is connected with the input and output port, so that the input and output port can conduct targeted control on the switching state of the first switching tube according to the output control signal, and whether a loop can be formed between the locking end and the power supply end or not is controlled, and whether the locking end can be locked or not is controlled. And through setting up first diode, can effectively protect power and open door control circuit to when the excessive electric current appears in the power end, first diode can restrict the electric current flow, and then can effectively prevent to take place to damage because of receiving the overcurrent with the load that is connected of locking end, thereby helps prolonging the life of load, in order to make open door control circuit more have reliability and security.
In an alternative embodiment, the unlocking driving circuit includes:
The fourth control end of the fourth switching tube is connected with the input/output port in series through a fifth resistor, the second connecting end of the fourth switching tube is connected with the third power supply end, and the first connecting end of the fourth switching tube is grounded through a sixth resistor;
The fifth control end of the fifth switching tube is arranged between the first connecting end of the fourth switching tube and the sixth resistor, the first connecting end of the fifth switching tube is connected with the sixth control end of the sixth switching tube through the seventh resistor, and the second connecting end of the fifth switching tube is connected with the third power supply end;
The first connecting end of the sixth switching tube is connected with the unlocking end, and the second connecting end of the sixth switching tube is grounded;
the second diode is arranged between the first connecting end of the sixth switching tube and the power supply end.
The beneficial effects are that: the fourth control end of the fourth switching tube is connected with the input and output port, so that the input and output port can conduct targeted control on the switching state of the fourth switching tube according to the output control signal, and further whether a loop can be formed between the unlocking end and the power end or not is controlled, and whether the unlocking end can be unlocked is controlled. And through setting up the second diode, can effectively protect power and open door control circuit to when the excessive electric current appears in the power end, the second diode can restrict the electric current flow, and then can effectively prevent to take place to damage because of receiving the overcurrent with the load that the unblock end is connected, thereby help prolonging the life of load, in order to make open door control circuit more have reliability and security.
In an alternative embodiment, the first terminal of the capacitor is connected to the second connection terminal of the third switching tube.
The beneficial effects are that: the circuit connection can be simplified, and the cost is reduced.
In an alternative embodiment, the first terminal of the capacitor is connected to the second connection terminal of the sixth switching tube.
The beneficial effects are that: the circuit connection can be simplified, and the cost is reduced.
In an alternative embodiment, the first control signal is in an opposite state to the second control signal.
The beneficial effects are that: the input/output port outputs two control signals in different level states as a first control signal and a second control signal respectively, so that the locking driving circuit and the unlocking driving circuit can conveniently identify whether the currently received control signals can control self-driving or not, and the aim of targeted control of the locking end or the unlocking end is fulfilled.
In an alternative embodiment, the door opening control circuit further includes:
The signal control circuit comprises a mechanical switch and an eighth resistor, and the mechanical switch and the eighth resistor are connected in series between the input and output ports and the ground; the mechanical switch is used for adjusting the control signal output by the input/output port into a low-level control signal, and the control signal comprises a first control signal, a second control signal or a third control signal.
The beneficial effects are that: the control signals output by the input and output ports can be forcedly regulated through the mechanical switch, so that software control is not needed, and the problem that unlocking and locking cannot be performed due to software faults can be effectively solved.
In an alternative embodiment, the door opening control circuit further includes:
The signal control circuit comprises a mechanical switch and an eighth resistor, the mechanical switch and the eighth resistor are connected in series between the input and output port and the third power supply end, the mechanical switch is used for adjusting a control signal output by the input and output port into a high-level control signal, and the control signal comprises a first control signal, a second control signal or a third control signal.
The beneficial effects are that: the control signals output by the input and output ports can be forcedly regulated through the mechanical switch, so that software control is not needed, and the problem that unlocking and locking cannot be performed due to software faults can be effectively solved.
In an alternative embodiment, the first switching tube, the second switching tube and the third switching tube are NPN triode or NMOS tube;
the fourth switching tube, the fifth switching tube and the sixth switching tube are PNP triode or PMOS tubes.
The beneficial effects are that: and a triode or an MOS tube is used as a switching tube, so that switching action can be realized rapidly, and the driving efficiency is improved. And moreover, the switching tube included in the locking driving circuit and the switching tube included in the unlocking driving circuit are symmetrically designed, so that when the input/output port outputs the first control signal or the second control signal, the locking driving circuit or the unlocking driving circuit can be controlled in a targeted manner, the occurrence of abnormal control can be effectively avoided, and the anti-interference capability of the electromagnetic coil is enhanced.
In a second aspect, the present utility model further provides a microwave oven, including the door opening control circuit of the first aspect or any implementation manner corresponding to the first aspect. Since the microwave oven includes the door opening control circuit, it has the same effect as the door opening control circuit, and will not be described again.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a door opening control circuit according to an embodiment of the present utility model;
Fig. 2 is a schematic diagram of another door opening control circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a door opening control circuit according to another embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a door opening control circuit according to another embodiment of the present utility model;
Fig. 5 is a schematic diagram of a door opening control circuit according to still another embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the related art, the power end of the control unit supplies power to the coil of the electromagnetic valve, but because the power supplied by the power end of the control unit is generally 5 watts (W), the power required by the power of the electromagnetic valve is generally 5.5-6.5W, and the power supplied by the power end of the control unit is smaller than the power capable of driving the electromagnetic valve to work normally, if the power of the control unit is directly utilized to supply power to the electromagnetic valve, the electromagnetic valve cannot work normally.
Embodiments of the present utility model are described below with reference to fig. 1 to 5.
According to an aspect of an embodiment of the present utility model, as shown in fig. 1 to 5, there is provided a door opening control circuit including: the locking driving circuit 1 comprises a locking end 11, and the locking end 11 is connected with the first end of the first electromagnetic coil 2; the unlocking driving circuit 3 comprises an unlocking end 31, and the unlocking end 31 is connected with the first end of the second electromagnetic coil 4; a power supply 5 having a power supply terminal 51, the power supply terminal 51 being connected to the second terminal of the first electromagnetic coil 2, the power supply terminal 51 being connected to the second terminal of the second electromagnetic coil 4; the power regulating circuit 6 comprises a capacitor E1 and a first resistor R1, wherein a first end of the capacitor E1 is connected with the power supply end 51, a second end of the capacitor E1 is grounded, one end of the first resistor R1 is connected with the first end of the capacitor E1, and a second end of the first resistor R1 is used for being connected with the first power supply end VDD; the microcontroller 7 is provided with an input/output port 71 which is respectively connected with the locking driving circuit 1 and the unlocking driving circuit 3, the input/output port 71 is used for outputting a first control signal, a second control signal or a third control signal, and the first control signal is used for driving the locking driving circuit 1 to control the locking end 11 to lock; the second control signal is used for driving the unlocking driving circuit 3 to control the unlocking end 31 to unlock, the third control signal is used for controlling the locking driving circuit 1 to control the locking end 11 to be in a maintenance state and controlling the unlocking driving circuit 3 to control the unlocking end 31 to be in a high-resistance state.
Specifically, in order to avoid the occurrence of abnormal control, the input/output port 71 of the microcontroller 7 is connected to the locking driving circuit 1 and the unlocking driving circuit 3 respectively, so that the locking driving circuit 1 and the unlocking driving circuit 3 are controlled in a targeted manner according to signals output by the input/output port 71, and when the input/output port 71 outputs a first control signal, the locking driving circuit 1 can be driven to control the locking end 11 to lock through the first electromagnetic coil; when the input/output port 71 outputs the second control signal, the unlocking driving circuit 3 can be driven to control the unlocking end 31 to unlock through the second electromagnetic coil 4; when the input/output port 71 outputs a high-impedance signal, the locking driving circuit 1 is controlled to control the locking terminal 11 to be in a maintaining state, and the unlocking driving circuit 3 is controlled to control the unlocking terminal 31 to be in a high-impedance state.
Further, in order to ensure that when the power output by the power supply end 61 can drive the electromagnetic coil to work normally, the capacitor E1 is used to receive the voltage input by the first power supply end VDD to store energy and reduce the peak power provided by the power supply end 61, and when the locking end 11 needs to perform the locking action, the first resistor R1 can be connected in series with the electromagnetic coil to reduce the peak power of the electromagnetic coil, so that the power supply provided by the power supply end 61 can directly control the first electromagnetic coil to work normally to drive the locking end 11 to lock, or when the unlocking end 31 needs to perform the unlocking action, the first resistor R1 can be connected in series with the electromagnetic coil to reduce the peak power of the electromagnetic coil, so that the power supply provided by the power supply end 61 can directly control the second electromagnetic coil to work normally to drive the unlocking end 31 to unlock.
In addition, the locking driving circuit 1 and the unlocking driving circuit 3 are respectively controlled through the same input/output port 71, so that interface resources of the microcontroller 7 are saved, and abnormal occurrence caused by misoperation of a plurality of input/output ports 71 can be avoided, so that the anti-interference capability of the door opening control circuit is enhanced.
In one embodiment, the lock driving circuit 1 includes: the first control end of the first switching tube Q1 is connected with the input/output port 71 in series through the second resistor R2, the first connecting end of the first switching tube Q1 is connected with the second power supply end through the third resistor R3, and the second connecting end of the first switching tube Q1 is grounded GND; the second control end of the second switching tube Q2 is arranged between the first connecting end of the first switching tube Q1 and the third resistor R3, the first connecting end of the second switching tube Q2 is connected with the second power supply end through the fourth resistor R4, and the second connecting end of the second switching tube Q2 is connected with the third control end of the third switching tube Q3; the first connecting end of the third switching tube Q3 is connected with the upper locking end 11, and the second connecting end of the third switching tube Q3 is grounded GND; the first diode D1 is disposed between the first connection terminal of the third switching tube Q3 and the power supply terminal 51.
Specifically, in order to facilitate driving the locking end 11 to lock when the locking driving circuit 1 receives the first control signal, the first control end of the first switching tube Q1 is connected in series with the input/output port 71 through the second resistor R2, so that the input/output port 71 can perform targeted control on the switching state of the first switching tube Q1 according to the output control signal, so that when a loop is formed between the locking end 11 and the power supply end 51, the locking of the locking end 11 can be controlled.
For example: when the input/output port 71 outputs the first control signal, the first switch tube Q1 is in an off state, the second power supply end can drive the second switch tube Q2 to be in an on state, so that the third switch tube Q3 is also in an on state, the lock-up end 11 and the power supply end 51 form a loop, and the first electromagnetic coil 2 can be powered by combining the voltage output by the power supply end 51, so that the purpose of controlling the lock-up of the lock-up end 11 can be achieved.
When the input/output port 71 outputs the second control signal or the high impedance signal, the first switching tube Q1 can be driven to be in the on state, so that the second power supply end cannot drive the second switching tube Q2 to be in the on state, and the second switching tube Q2 and the third switching tube Q3 are both in the off state, and the locking end 11 cannot form a loop with the power supply end 51, so that the first electromagnetic coil 2 cannot be powered, and thus the locking of the locking end 11 cannot be controlled.
Moreover, by setting the first diode D1, the power supply 5 and the door opening control circuit can be effectively protected, so that when the power supply end 51 generates excessive current, the first diode D1 can limit the current flow, and further, the load connected with the upper locking end 11 can be effectively prevented from being damaged due to the over current, thereby being beneficial to prolonging the service life of the load, and further, the door opening control circuit has reliability and safety.
In one embodiment, the unlock drive circuit 3 includes: the fourth control end of the fourth switching tube Q4 is connected with the input/output port 71 in series through a fifth resistor R5, the second connecting end of the fourth switching tube Q4 is connected with the third power supply end, and the first connecting end of the fourth switching tube Q4 is grounded through a sixth resistor R6; the fifth control end of the fifth switching tube Q5 is arranged between the first connecting end of the fourth switching tube Q4 and the sixth resistor R6, the first connecting end of the fifth switching tube Q5 is connected with the sixth control end of the sixth switching tube Q6 through the seventh resistor R7, and the second connecting end of the fifth switching tube Q5 is connected with the third power supply end; the first connecting end of the sixth switching tube Q6 is connected with the unlocking end 31, and the second connecting end of the sixth switching tube Q6 is grounded; the second diode D2 is disposed between the first connection terminal of the sixth switching tube Q6 and the power supply terminal 51.
Specifically, in order to facilitate driving the unlocking end 31 to unlock when the unlocking driving circuit 3 receives the second control signal, the fourth control end of the fourth switching tube Q4 is connected in series with the input/output port 71 through the fourth resistor R4, so that the input/output port 71 can perform targeted control on the switching state of the fourth switching tube Q4 according to the output control signal, so that when a loop is formed between the unlocking end 31 and the power supply end 51, the unlocking end 31 can be controlled.
Wherein the voltages provided by the second power supply terminal and the third power supply terminal are the same, and thus, VCC is used in the figure.
For example: when the input/output port 71 outputs the second control signal, the fourth switching tube Q4 is in an off state, so that the third power supply end can drive the fifth switching tube Q5 to be in an on state, so that the sixth switching tube Q6 is also in an on state, the unlocking end 31 and the power end 51 form a loop, and the second electromagnetic coil 4 can be powered by combining the voltage output by the power end 51, thereby achieving the purpose of controlling the unlocking of the unlocking end 31.
When the input/output port 71 outputs the first control signal or the high-impedance signal, the fourth switching tube Q4 can be driven to be in a conducting state, so that the third power supply end cannot drive the fifth switching tube Q5 to be in a conducting state, and the second switching tube Q2 and the third switching tube Q3 are both in a disconnected state, and the unlocking end 31 cannot form a loop with the power supply end 51, so that the second electromagnetic coil 4 cannot be supplied with power, and therefore, the unlocking end 31 cannot be controlled to unlock.
Moreover, by arranging the second diode D2, the power supply 5 and the door opening control circuit can be effectively protected, so that when the power supply end 51 generates excessive current, the second diode D2 can limit the current flow, and further, the load connected with the unlocking end 31 can be effectively prevented from being damaged due to the over current, thereby being beneficial to prolonging the service life of the load, and further, the door opening control circuit has reliability and safety.
In one embodiment, the first end of the capacitor E1 and the second connection end of the third switch tube Q3 are grounded, so that the circuit connection can be simplified and the cost can be reduced.
In one embodiment, the first end of the capacitor E1 and the second connection end of the sixth switching tube Q6 are grounded, so that the circuit connection can be simplified and the cost can be reduced.
In one embodiment, the first control signal is in an opposite state to the second control signal. For example: if the first control signal is a high level signal, the second control signal is a low level signal; if the first control signal is a low level signal, the second control signal is a high level signal. The input/output port 71 outputs two control signals in different level states as a first control signal and a second control signal, so that the locking driving circuit 1 and the unlocking driving circuit 3 can conveniently identify whether the currently received control signal can control the driving of the locking driving circuit, thereby achieving the purpose of targeted control of the locking end 11 or the unlocking end 31.
In one embodiment, as shown in fig. 4, the door opening control circuit further includes: the signal control circuit 8 comprises a mechanical switch K1 and an eighth resistor R8, and the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the ground GND; the mechanical switch K1 is configured to adjust a control signal output from the input/output port 71 to a low-level control signal, where the control signal includes a first control signal, a second control signal, or a third control signal.
Specifically, the mechanical switch K1 may be a tact switch or a push switch, and may be mounted on a control panel of the microwave oven, so that a user may manually adjust a control signal output from the input/output port 71 by touching the mechanical switch K1, and thus, software control is not required, and the problem that unlocking and locking cannot be performed due to a software fault can be effectively solved.
Further, the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the ground GND, and when the mechanical switch K1 is in the on state by touch, the level state of the control signal output by the input/output port 71 can be pulled down, and then the control signal with low level is sent to the lock driving circuit 1 and the unlock driving circuit 3, so that the corresponding driving circuit can execute the locking or unlocking function.
For example: taking the first control signal as a low level signal and the second control signal as a high level signal as an example. When the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the ground GND, and the mechanical switch K1 is in a conducting state, no matter whether the input/output port 71 outputs the first control signal or the second control signal, the first control signal is adjusted to be the first control signal, so that the first switching tube Q1 is in a conducting state, the second switching tube Q2 and the third switching tube Q3 are both in a disconnected state, the lock-up end 11 is in a high-impedance state, the fourth switching tube Q4 is in a disconnected state, the fifth switching tube Q5 and the sixth switching tube Q6 are both in a conducting state, and the unlock end 31 is unlocked.
When the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the ground GND, and the mechanical switch K1 is in the off state, the level state of the control signal output by the input/output port 71 is not disturbed. Therefore, if the input/output port 71 outputs the first control signal, the first switching tube Q1 is in the on state, the second switching tube Q2 and the third switching tube Q3 are both in the off state, the lock-up end 11 is in the high-impedance state, the fourth switching tube Q4 is in the off state, the fifth switching tube Q5 and the sixth switching tube Q6 are both in the on state, and the unlock end 31 is unlocked. If the input/output port 71 outputs the second control signal, the first switching tube Q1 is in an off state, the second switching tube Q2 and the third switching tube Q3 are both in an on state, and the locking end 11 is locked; the fourth switching tube Q4 is in an on state, the fifth switching tube Q5 and the sixth switching tube Q6 are both in an off state, and the unlock end 31 is in a high-resistance state. If the input/output port outputs a high-impedance signal, the first switching tube Q1 and the fourth switching tube Q4 are in an on state, the second switching tube Q2, the third switching tube Q3, the fifth switching tube Q5 and the sixth switching tube Q6 are all in an off state, and the locking end 11 and the unlocking end 31 are all in a high-impedance state.
In one embodiment, the door opening control circuit further includes: the signal control circuit 8 includes a mechanical switch K1 and an eighth resistor R8, where the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the third power supply terminal, and the mechanical switch K1 is used to adjust the control signal output by the input/output port 71 to a high level control signal, and the control signal includes a first control signal, a second control signal, or a third control signal.
Specifically, further, the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the third power supply end, and when the mechanical switch K1 is in the on state by touch, the level state of the control signal output by the input/output port 71 can be pulled up, and then the control signal with high level is sent to the lock driving circuit 1 and the unlock driving circuit 3, so that the corresponding driving circuit can execute the locking or unlocking function.
For example: taking the first control signal as a low level signal and the second control signal as a high level signal as an example. When the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the third power supply terminal, and the mechanical switch K1 is in a conducting state, no matter whether the input/output port 71 outputs the first control signal or the second control signal, the mechanical switch K1 is adjusted to the second control signal, so that the first switching tube Q1 is in an off state, the second switching tube Q2 and the third switching tube Q3 are both in a conducting state, and the locking terminal 11 is locked; the fourth switching tube Q4 is in an on state, the fifth switching tube Q5 and the sixth switching tube Q6 are both in an off state, and the unlock end 31 is in a high-resistance state.
When the mechanical switch K1 and the eighth resistor R8 are connected in series between the input/output port 71 and the third power supply terminal, and the mechanical switch K1 is in an off state, the level state of the control signal indicating the output of the input/output port 71 is not disturbed. Therefore, if the input/output port 71 outputs the first control signal, the first switching tube Q1 is in the on state, the second switching tube Q2 and the third switching tube Q3 are both in the off state, the lock-up end 11 is in the high-impedance state, the fourth switching tube Q4 is in the off state, the fifth switching tube Q5 and the sixth switching tube Q6 are both in the on state, and the unlock end 31 is unlocked. If the input/output port 71 outputs the second control signal, the first switching tube Q1 is in an off state, the second switching tube Q2 and the third switching tube Q3 are both in an on state, and the locking end 11 is locked; the fourth switching tube Q4 is in an on state, the fifth switching tube Q5 and the sixth switching tube Q6 are both in an off state, and the unlock end 31 is in a high-resistance state. If the input/output port outputs a high-impedance signal, the first switching tube Q1 and the fourth switching tube Q4 are in an on state, the second switching tube Q2, the third switching tube Q3, the fifth switching tube Q5 and the sixth switching tube Q6 are all in an off state, and the locking end 11 and the unlocking end 31 are all in a high-impedance state.
In one embodiment, the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are NPN transistors or NMOS transistors; the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 are PNP triodes or PMOS tubes, so that switching action can be realized rapidly, and driving efficiency is improved. In addition, in the utility model, the locking driving circuit 1 and the unlocking driving circuit 3 adopt a symmetrical circuit design, so that when the input/output port 71 outputs the first control signal or the second control signal, the locking driving circuit 1 or the unlocking driving circuit 3 can be controlled in a targeted manner, thereby effectively avoiding the occurrence of abnormal control and being beneficial to enhancing the anti-interference capability of the electromagnetic coil.
Therefore, in the present utility model, the setting of each switching tube in the lock driving circuit and the setting of each switching tube in the unlock driving circuit may be as follows:
If the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are NPN transistors, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 may be PNP transistors;
If the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are NPN transistors, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 may be PMOS tubes;
If the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are all NMOS tubes, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 may be PNP transistors;
if the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are all NMOS tubes, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 may be PMOS tubes.
In an implementation scenario, taking fig. 4 or fig. 5 as an example, when the switch control circuit is powered on, the mechanical switch K1 is in a conductive state (for example, the continuous touch is greater than 33 milliseconds (ms)), the first switch tube Q1 is in a disconnected state, the second switch tube Q2 and the third switch tube Q3 are all in a conductive state, and the unlocking end is in a conductive state.
In another implementation scenario, after the first power supply terminal VDD is powered on, the voltage provided by the capacitor E1 is equal to the voltage output by the first power supply terminal VDD, so that when the locking terminal 11 needs to perform locking or unlocking actions by the unlocking terminal 31, the peak power provided by the power supply terminal 61 can be reduced to below 3.8W (10 ms-30 ms) by the energy stored by the capacitor, and thus when the electromagnetic coil performs locking or unlocking actions, the peak power of the electromagnetic coil in a normal working state can be reduced to 4W within 20ms, so that the power supply (5W) provided by the power supply terminal 51 can directly supply power to the electromagnetic coil.
According to an embodiment of the present utility model, in another aspect, there is also provided a microwave oven including any one of the door opening control circuits provided by the present utility model. Since the microwave oven includes the door opening control circuit, it has the same effect as the door opening control circuit, and will not be described again.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.
Claims (10)
1. A door opening control circuit, characterized in that the door opening control circuit comprises:
The locking driving circuit comprises a locking end which is connected with the first end of the first electromagnetic coil;
the unlocking driving circuit comprises an unlocking end which is connected with the first end of the second electromagnetic coil;
The power supply is provided with a power supply end, the power supply end is connected with the second end of the first electromagnetic coil, and the power supply end is connected with the second end of the second electromagnetic coil;
The power regulation circuit comprises a capacitor and a first resistor, wherein a first end of the capacitor is connected with the power supply end, a second end of the capacitor is grounded, one end of the first resistor is connected with the first end of the capacitor, and a second end of the first resistor is used for being connected with a first power supply end;
The microcontroller is provided with an input/output port which is respectively connected with the locking driving circuit and the unlocking driving circuit, the input/output port is used for outputting a first control signal, a second control signal or a third control signal, and the first control signal is used for driving the locking driving circuit to control the locking end to lock; the second control signal is used for driving the unlocking driving circuit to control the unlocking end to unlock, and the third control signal is used for controlling the locking driving circuit to control the locking end to be in a maintenance state and controlling the unlocking driving circuit to control the unlocking end to be in a high-resistance state.
2. The door opening control circuit according to claim 1, wherein the lock driving circuit includes:
the first control end of the first switching tube is connected with the input/output port in series through a second resistor, the first connecting end of the first switching tube is connected with the second power supply end through a third resistor, and the second connecting end of the first switching tube is grounded;
The second control end of the second switching tube is arranged between the first connecting end of the first switching tube and the third resistor, the first connecting end of the second switching tube is connected with the second power supply end through the fourth resistor, and the second connecting end of the second switching tube is connected with the third control end of the third switching tube;
The first connecting end of the third switching tube is connected with the upper locking end, and the second connecting end of the third switching tube is grounded;
the first diode is arranged between the first connecting end of the third switching tube and the power supply end.
3. The door opening control circuit according to claim 2, wherein the unlocking driving circuit includes:
The fourth control end of the fourth switching tube is connected with the input/output port in series through a fifth resistor, the second connecting end of the fourth switching tube is connected with the third power supply end, and the first connecting end of the fourth switching tube is grounded through a sixth resistor;
The fifth control end of the fifth switching tube is arranged between the first connecting end of the fourth switching tube and the sixth resistor, the first connecting end of the fifth switching tube is connected with the sixth control end of the sixth switching tube through the seventh resistor, and the second connecting end of the fifth switching tube is connected with the third power supply end;
the first connecting end of the sixth switching tube is connected with the unlocking end, and the second connecting end of the sixth switching tube is grounded;
The second diode is arranged between the first connecting end of the sixth switching tube and the power supply end.
4. The door opening control circuit of claim 3, wherein the first terminal of the capacitor is commonly grounded to the second terminal of the third switching tube.
5. The door opening control circuit of claim 3, wherein the first terminal of the capacitor is commonly grounded to the second terminal of the sixth switching tube.
6. The door opening control circuit according to claim 4 or 5, wherein the first control signal is opposite to the second control signal in level state.
7. The door opening control circuit of claim 6, further comprising:
The signal control circuit comprises a mechanical switch and an eighth resistor, and the mechanical switch and the eighth resistor are connected in series between the input and output ports and the ground; the mechanical switch is used for adjusting the control signal output by the input/output port to a low-level control signal, and the control signal comprises the first control signal, the second control signal or the third control signal.
8. The door opening control circuit of claim 6, further comprising:
The signal control circuit comprises a mechanical switch and an eighth resistor, wherein the mechanical switch and the eighth resistor are connected in series between the input and output port and the third power supply end, the mechanical switch is used for adjusting a control signal output by the input and output port into a high-level control signal, and the control signal comprises the first control signal, the second control signal or the third control signal.
9. The door opening control circuit according to claim 4 or 5, wherein,
The first switching tube, the second switching tube and the third switching tube are NPN triode or NMOS tube;
The fourth switching tube, the fifth switching tube and the sixth switching tube are PNP triode or PMOS tubes.
10. A microwave oven comprising the door opening control circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322426473.5U CN220911504U (en) | 2023-09-06 | 2023-09-06 | Door opening control circuit and microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322426473.5U CN220911504U (en) | 2023-09-06 | 2023-09-06 | Door opening control circuit and microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220911504U true CN220911504U (en) | 2024-05-07 |
Family
ID=90914561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322426473.5U Active CN220911504U (en) | 2023-09-06 | 2023-09-06 | Door opening control circuit and microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220911504U (en) |
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2023
- 2023-09-06 CN CN202322426473.5U patent/CN220911504U/en active Active
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