CN220913527U - Solenoid valve control circuit and microwave oven - Google Patents
Solenoid valve control circuit and microwave oven Download PDFInfo
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- CN220913527U CN220913527U CN202322510015.XU CN202322510015U CN220913527U CN 220913527 U CN220913527 U CN 220913527U CN 202322510015 U CN202322510015 U CN 202322510015U CN 220913527 U CN220913527 U CN 220913527U
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Abstract
The utility model discloses a solenoid valve control circuit and a microwave oven, wherein the circuit comprises: the device comprises a zero crossing detection circuit, an unlocking driving circuit and an unlocking control circuit; one end of the zero-crossing detection circuit receives a mains supply input signal, the other end of the zero-crossing detection circuit is connected with one end of the unlocking driving circuit, the other end of the unlocking driving circuit is connected with the first end of the unlocking control circuit, and the second end of the unlocking control circuit is connected with an unlocking winding of the electromagnetic valve. By implementing the utility model, the zero-crossing detection circuit and the unlocking driving circuit are arranged, when no mains supply is input or the mains supply input signal is zero, the zero-crossing detection circuit generates a detection result based on the mains supply input signal, the unlocking driving circuit outputs a driving signal to the unlocking control circuit based on the detection result, and the unlocking control circuit controls the electromagnetic valve to be unlocked. Therefore, the electromagnetic valve control circuit realizes the unlocking function of the power-off hardware, and avoids the problem that the user experience is influenced due to the fact that software judgment is adopted and the time is too long.
Description
Technical Field
The utility model relates to the technical field of household appliances, in particular to a solenoid valve control circuit and a microwave oven.
Background
In order to meet the requirement of secondary door opening of the new UL (Underwriters Laboratories, american security detection laboratory company) standard, part of microwave ovens use a solenoid valve having two windings, one winding (simply called the locking winding) being energized for push rod action and the other winding (simply called the unlocking winding) being energized for pull rod action, the combination of the two being used as door lock control to achieve the first door opening action. If the whole machine suddenly has no mains supply input, the traditional method is to detect zero crossing signals through software and judge whether a plurality of periods or no zero crossing signals exist, then the whole machine is considered to be powered off, and then an unlocking signal is sent to unlock, so that the problem that the whole machine cannot be powered off and opened is solved. However, if software misjudges the zero-crossing signal, so that the judging time is prolonged, or the zero-crossing signal judging time is set too long, the residual electric quantity of the power supply of the commonly used low-power computer board cannot be used for driving the electromagnetic valve, the whole machine is easy to power off and the door cannot be opened, and the user experience is affected.
Disclosure of utility model
In view of the above, the embodiment of the utility model provides a solenoid valve control circuit and a microwave oven, so as to solve the technical problem that the overlong zero-crossing signal detection and judgment time in the prior art affects the user experience.
The technical scheme provided by the embodiment of the utility model is as follows:
A first aspect of an embodiment of the present utility model provides a solenoid valve control circuit, including: the device comprises a zero crossing detection circuit, an unlocking driving circuit and an unlocking control circuit; one end of the zero-crossing detection circuit receives a mains supply input signal, the other end of the zero-crossing detection circuit is connected with one end of the unlocking driving circuit, the other end of the unlocking driving circuit is connected with the first end of the unlocking control circuit, and the second end of the unlocking control circuit is connected with an unlocking winding of the electromagnetic valve.
In an alternative embodiment, the zero crossing detection circuit includes; a rectifying circuit, an isolating circuit and an unlocking signal generating circuit; one end of the rectifying circuit is connected with external commercial power, the other end of the rectifying circuit is connected with one end of the isolating circuit, and the other end of the isolating circuit is connected with one end of the unlocking signal generating circuit and one end of the unlocking driving circuit.
In an alternative embodiment, the rectifying circuit includes: the unlocking signal generating circuit comprises a first resistor; one end of the second resistor is connected with the live wire, the anode of the second diode is connected with the second end of the photoelectric coupler and the zero line, the other end of the second resistor is connected with the anode of the first diode, the cathode of the first diode is connected with the cathode of the second diode and the first end of the photoelectric coupler, the third end of the photoelectric coupler is grounded, the fourth end of the photoelectric coupler is connected with one end of the first resistor and one end of the unlocking driving circuit, and the other end of the first resistor is connected with an external power supply.
In an alternative embodiment, the unlocking driving circuit includes: a signal conversion circuit, a drive level generation circuit, and a drive signal generation circuit; one end of the signal conversion circuit is connected with the other end of the zero-crossing detection circuit, the other end of the signal conversion circuit is connected with one end of the driving level generation circuit, the other end of the driving level generation circuit is connected with one end of the driving signal generation circuit, and the other end of the driving signal generation circuit is connected with the first end of the unlocking control circuit.
In an alternative embodiment, the signal conversion circuit includes a fourth capacitor, a fifteenth resistor, a fourteenth resistor, a sixth switching tube, and a twelfth resistor, the driving level generation circuit includes a third capacitor, a thirteenth resistor, an eleventh resistor, and a fifth switching tube, and the driving signal generation circuit includes a fifth diode and a tenth resistor; one end of the fourth capacitor is connected with the other end of the zero-crossing detection circuit, the other end of the fourth capacitor is connected with one end of a fifteenth resistor, the other end of the fifteenth resistor is connected with one end of a fourteenth resistor and one end of a sixth switch tube, the other end of the fourteenth resistor is connected with the second end of the sixth switch tube and an external power supply, the third end of the sixth switch tube is connected with one end of a twelfth resistor, the other end of the twelfth resistor is connected with one end of the third capacitor, one end of the thirteenth resistor and one end of an eleventh resistor, the other end of the third capacitor is connected with the other end of the thirteenth resistor and is grounded, the other end of the eleventh resistor is connected with the first end of a fifth switch tube, the second end of the fifth switch tube is grounded, the third end of the fifth switch tube is connected with the anode of a fifth diode and one end of the tenth resistor, the other end of the tenth resistor is connected with the external power supply, and the cathode of the fifth diode is connected with the first end of the unlocking control circuit.
In an alternative embodiment, the solenoid valve control circuit further includes: a microprocessor and a locking control circuit; the first pin of the microprocessor is connected with one end of the locking control circuit, the other end of the locking control circuit is connected with the locking winding of the electromagnetic valve, and the second pin of the microprocessor is connected with the third end of the unlocking control circuit.
In an alternative embodiment, the solenoid valve control circuit further includes: and one end of the filter circuit is connected with the other end of the zero-crossing detection circuit, and the other end of the filter circuit is connected with a third pin of the microprocessor.
In an alternative embodiment, the filter circuit includes: a first capacitor, a second capacitor and a third resistor; one end of the first capacitor is connected with one end of the third resistor and the other end of the zero-crossing detection circuit, the other end of the first capacitor is connected with one end of the second capacitor and grounded, and the other end of the third resistor is connected with the other end of the second capacitor and a third pin of the microprocessor.
In an alternative embodiment, the unlock control circuit includes: the locking control circuit comprises an eighth resistor, a ninth resistor and a fourth switching tube; one end of the fifth resistor is connected with the second pin of the microprocessor, the other end of the fifth resistor is connected with the other end of the sixth resistor, the first end of the second switching tube and the other end of the unlocking driving circuit, the other end of the sixth resistor is connected with the second end of the second switching tube and grounded, and the third end of the second switching tube is connected with the unlocking winding of the electromagnetic valve; one end of the eighth resistor is connected with the first pin of the microprocessor, the other end of the eighth resistor is connected with the other end of the ninth resistor and the first end of the fourth switching tube, the other end of the ninth resistor is connected with the second end of the fourth switching tube and grounded, and the third end of the fourth switching tube is connected with a locking winding of the electromagnetic valve.
A second aspect of the embodiment of the present utility model provides a microwave oven, including a solenoid valve and a solenoid valve control circuit according to any one of the first aspect and the first aspect of the embodiment of the present utility model.
The technical scheme of the utility model has the following advantages:
According to the electromagnetic valve control circuit and the microwave oven provided by the embodiment of the utility model, the zero-crossing detection circuit and the unlocking driving circuit are arranged on the basis of the unlocking control circuit, when no mains supply is input or the mains supply input signal is zero, the zero-crossing detection circuit generates a detection result based on the mains supply input signal, and the unlocking driving circuit outputs the driving signal to the unlocking control circuit based on the detection result, and the unlocking control circuit controls the electromagnetic valve to be unlocked. Therefore, the electromagnetic valve control circuit adopts the zero-crossing detection circuit, the unlocking driving circuit and the unlocking control circuit to unlock the electromagnetic valve under the condition of no mains supply input, and the problem that the user experience is affected due to the fact that software judgment is adopted and the time is too long is avoided.
According to the electromagnetic valve control circuit provided by the embodiment of the utility model, the filtering circuit is arranged, the detection result output by the zero-crossing detection circuit is filtered and then input to the microprocessor, and the microprocessor can realize the starting current control of the inductive load based on the filtered result.
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 block diagram of a solenoid valve control circuit in an embodiment of the utility model;
FIG. 2 is a schematic diagram of a solenoid valve control circuit according to an embodiment of the present utility model;
FIG. 3 is a block diagram of another solenoid valve control circuit according to an embodiment of the utility model;
Fig. 4 is a block diagram illustrating a structure of a microwave oven according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. 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 description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
An embodiment of the present utility model provides a solenoid valve control circuit, as shown in fig. 1, including: a zero-crossing detection circuit 1, an unlocking drive circuit 2, and an unlocking control circuit 3; one end of the zero-crossing detection circuit 1 receives a mains supply input signal, the other end of the zero-crossing detection circuit 1 is connected with one end of the unlocking driving circuit 2, the other end of the unlocking driving circuit 2 is connected with the first end of the unlocking control circuit 3, and the second end of the unlocking control circuit 3 is connected with an unlocking winding of the electromagnetic valve 4.
Specifically, in the normal operation process of the electromagnetic valve 4, the unlocking control circuit 3 is used for receiving an externally input level signal to control the unlocking winding of the electromagnetic valve 4 to be electrified, so as to perform an unlocking function. In addition, when there is no mains input or the mains input signal is zero, the unlock winding of the solenoid valve 4 needs to be controlled to unlock. Therefore, the zero-crossing detection circuit 1 and the unlocking drive circuit 2 are provided to detect the commercial power. The zero-crossing detection circuit 1 is used for receiving a mains input signal, and when the mains input signal is zero and is not zero, the zero-crossing detection circuit 1 outputs different signals. The signal is input to the unlock drive circuit 2, and the unlock drive circuit 2 outputs different drive signals to the unlock control circuit 3 according to different signals. For example, when the mains input signal is zero, the drive signal output by the unlock drive circuit 2 can control the unlock control circuit 3 to operate, thereby unlocking the solenoid valve 4.
According to the electromagnetic valve control circuit provided by the embodiment of the utility model, the zero-crossing detection circuit and the unlocking driving circuit are arranged on the basis of the unlocking control circuit, when no commercial power is input or the commercial power input signal is zero, the zero-crossing detection circuit generates a detection result based on the commercial power input signal, and the unlocking driving circuit outputs a driving signal to the unlocking control circuit based on the detection result, so that the electromagnetic valve is controlled to be unlocked by the unlocking control circuit. Therefore, the electromagnetic valve control circuit adopts the zero-crossing detection circuit, the unlocking driving circuit and the unlocking control circuit to unlock the electromagnetic valve under the condition of no mains supply input, and the problem that the user experience is affected due to the fact that software judgment is adopted and the time is too long is avoided.
In an alternative embodiment, the zero-crossing detection circuit 1 comprises; a rectifying circuit, an isolating circuit and an unlocking signal generating circuit; one end of the rectifying circuit is connected with external commercial power, the other end of the rectifying circuit is connected with one end of the isolating circuit, and the other end of the isolating circuit is connected with one end of the unlocking signal generating circuit and one end of the unlocking driving circuit 2. The rectifier circuit is used for rectifying the mains input signal, the isolation circuit is used for isolating the mains and the subsequent circuit, and the unlocking signal generating circuit is used for outputting a high-level signal or a square wave signal when the mains input signal is zero. For example, when the mains input signal is not zero, the rectifying circuit carries out half-wave rectification on the mains input signal, and then outputs a square wave zero crossing signal with the same frequency as the mains after passing through the isolating circuit. When the mains supply input signal is zero, the rectifying circuit and the isolating circuit do not work, and the unlocking signal generating circuit outputs a high-level signal to the unlocking driving circuit 2.
Specifically, as shown in fig. 2, the rectifying circuit includes: the device comprises a first diode D1, a second diode D2 and a second resistor R2, wherein the isolation circuit comprises a photoelectric coupler U1, and the unlocking signal generating circuit comprises a first resistor R1; one end of the second resistor R2 is connected with the live wire AC_L, the anode of the second diode D2 is connected with the second end of the photoelectric coupler U1 and the zero line AC_N, the other end of the second resistor R2 is connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with the cathode of the second diode D2 and the first end of the photoelectric coupler U1, the third end of the photoelectric coupler U1 is grounded, the fourth end of the photoelectric coupler U1 is connected with one end of the first resistor R1 and one end of the unlocking driving circuit 2, and the other end of the first resistor R1 is connected with an external power supply VCC.
In an alternative embodiment, the unlock drive circuit 2 includes: a signal conversion circuit, a drive level generation circuit, and a drive signal generation circuit; one end of the signal conversion circuit is connected with the other end of the zero-crossing detection circuit 1, the other end of the signal conversion circuit is connected with one end of the driving level generation circuit, the other end of the driving level generation circuit is connected with one end of the driving signal generation circuit, and the other end of the driving signal generation circuit is connected with the first end of the unlocking control circuit 3.
Wherein the signal conversion circuit receives the signal output by the zero-crossing detection circuit 1 for conversion. For example, when the zero crossing detection circuit 1 outputs a square wave zero crossing signal, the signal conversion circuit converts the signal to output an ac-like signal; when the zero-crossing detection circuit 1 outputs a high-level signal, the signal conversion circuit isolates the signal and outputs a low-level signal. The drive level generation circuit generates a drive level based on the signal output from the signal conversion circuit, for example, when the signal conversion circuit outputs an alternating-current-like signal, the signal is converted by the drive level generation circuit, and a drive low-level signal is generated; when the signal conversion circuit outputs a low-level signal, the signal is converted by the drive level generation circuit, and a drive high-level signal is generated. The drive signal generation circuit generates a drive signal in accordance with the drive level output from the drive level generation circuit, for example, when the drive level generation circuit outputs a drive low level signal, the drive signal generation circuit does not operate, thereby outputting the low level signal; when the drive level generation circuit outputs a drive high level signal, the drive signal generation circuit operates, thereby outputting the high level signal.
Specifically, as shown in fig. 2, the signal conversion circuit includes a fourth capacitor C4, a fifteenth resistor R15, a fourteenth resistor R14, a sixth switching tube Q6, and a twelfth resistor R12, the driving level generation circuit includes a third capacitor C3, a thirteenth resistor R13, an eleventh resistor R11, and a fifth switching tube Q5, and the driving signal generation circuit includes a fifth diode D5 and a tenth resistor R10.
One end of the fourth capacitor C4 is connected to the other end of the zero-crossing detection circuit 1, the other end of the fourth capacitor C4 is connected to one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected to one end of the fourteenth resistor R14 and the first end of the sixth switching tube Q6, the other end of the fourteenth resistor R14 is connected to the second end of the sixth switching tube Q6 and the external power supply, the third end of the sixth switching tube Q6 is connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected to one end of the third capacitor C3, one end of the thirteenth resistor R13 and one end of the eleventh resistor R11, the other end of the third capacitor C3 is connected to the other end of the thirteenth resistor R13 and is grounded, the other end of the eleventh resistor R11 is connected to the first end of the fifth switching tube Q5, the second end of the fifth switching tube Q5 is grounded, the third end of the fifth switching tube Q5 is connected to the anode of the fifth diode D5 and one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the external power supply, and the other end of the fifth diode D5 is connected to the cathode of the fifth end of the fifth diode D3.
When the zero crossing detection circuit 1 outputs a square wave zero crossing signal, the signal passes through the fourth capacitor C4, so that the fourth capacitor C4 is continuously charged and discharged, and the sixth switching tube Q6 is continuously turned on and off, so as to output an ac-like signal, the ac-like signal passes through the third capacitor C3, and due to the isolation and direct-crossing characteristics of the capacitors, a high-level signal is generated on the third capacitor C3, and the high-level signal makes the fifth switching tube Q5 be turned on through the fifth switching tube Q5, and then the signal of the external power supply flows into the ground through the tenth resistor R10 and the fifth switching tube Q5, and the fifth diode D5 cannot be operated in an off state, so that the cathode of the fifth switching tube Q5 outputs a low-level signal. The low level signal cannot drive the unlock control circuit 3 so that the solenoid valve 4 is not unlocked.
When the zero-crossing detection circuit 1 outputs a high-level signal, the signal is isolated by the fourth capacitor C4, so that no current passes through the sixth switching tube Q6 and the high-level signal on the third capacitor C3 becomes a low-level signal after the third capacitor C3 discharges rapidly, and the fifth switching tube Q5 is turned off. At this time, after the signal of the external power supply passes through the tenth resistor R10, the fifth diode D5 is forward biased, and the cathode of the fifth switching tube Q5 outputs a high-level signal, and the high-level signal drives the unlock control circuit 3 to unlock the solenoid valve 4. Thereby realizing the unlocking function of the electromagnetic valve 4 when the mains input signal is zero.
In the unlocking driving circuit 2, a plurality of resistors are further provided, and the resistors play a role in limiting current or serve as pull-down resistors of a switching tube when the unlocking driving circuit 2 works, so that a protection function of the circuit is realized. As shown in fig. 2, a triode may be used for both the fifth switching transistor Q5 and the sixth switching transistor Q6. For example, the fifth switching transistor Q5 employs a fifth NPN transistor, and the sixth switching transistor Q6 employs a sixth PNP transistor. The base B of the fifth NPN triode is a first end of the fifth switching tube Q5, the collector C of the fifth NPN triode is a third end of the fifth switching tube Q5, and the emitter E of the fifth NPN triode is a second end of the fifth switching tube Q5. The base B of the sixth PNP triode is the first end of the sixth switching tube Q6, the collector C of the sixth PNP triode is the third end of the sixth switching tube Q6, and the emitter E of the sixth PNP triode is the second end of the sixth switching tube Q6. Note that, the fifth switching transistor Q5 and the sixth switching transistor Q6 may be MOS transistors. The specific structures of the fifth switching tube Q5 and the sixth switching tube Q6 are not limited in the embodiment of the present utility model. As long as the corresponding functions can be realized.
In an alternative embodiment, as shown in fig. 3, the solenoid valve control circuit further includes: a microprocessor 5 and a locking control circuit 6; a first pin of the microprocessor 5 is connected with one end of the locking control circuit 6, the other end of the locking control circuit 6 is connected with a locking winding of the electromagnetic valve 4, and a second pin of the microprocessor 5 is connected with a third end of the unlocking control circuit 3. When the electromagnetic valve 4 needs to be locked, the first pin of the microprocessor 5 outputs a high-level signal, and the high-level signal controls the electromagnetic valve 4 to be locked through the locking control circuit 6; when the electromagnetic valve 4 needs to be unlocked, the second pin of the microprocessor 5 outputs a high-level signal, and the unlocking control circuit 3 controls the electromagnetic valve 4 to be unlocked. As shown in fig. 2, the microprocessor 5 may implement a signal output function using a single-chip microcomputer. It should be noted that, the processing of the first pin output high level signal or the second pin output high level signal of the microprocessor 5 may refer to the related art, and will not be described herein.
Specifically, as shown in fig. 2, the unlock control circuit 3 includes: the locking control circuit 6 comprises an eighth resistor R8, a ninth resistor R9 and a fourth switching tube Q4; one end of the fifth resistor R5 is connected with the second pin Con2 of the microprocessor 5, the other end of the fifth resistor R5 is connected with the other end of the sixth resistor R6, the first end of the second switching tube Q2 and the other end of the unlocking driving circuit 2, the other end of the sixth resistor R6 is connected with the second end of the second switching tube Q2 and grounded, and the third end of the second switching tube Q2 is connected with the unlocking winding of the electromagnetic valve 4; one end of the eighth resistor R8 is connected with the first pin Con1 of the microprocessor 5, the other end of the eighth resistor R8 is connected with the other end of the ninth resistor R9 and the first end of the fourth switching tube Q4, the other end of the ninth resistor R9 is connected with the second end of the fourth switching tube Q4 and grounded, and the third end of the fourth switching tube Q4 is connected with a locking winding of the electromagnetic valve 4.
Wherein, for the unlocking control circuit 3, when it receives the high level signal output by the microprocessor 5 or receives the high level signal output by the unlocking driving circuit 2, the second switching tube Q2 is turned on, so that the unlocking winding of the electromagnetic valve 4 is electrified, thereby realizing the unlocking function. For the locking control circuit 6, when the locking control circuit receives a high-level signal output by the microprocessor 5, the fourth switching tube Q4 is conducted, so that a locking winding of the electromagnetic valve 4 is electrified, and the locking function is realized.
As shown in fig. 2, in the unlock control circuit 3 and the lock control circuit 6, the fifth resistor R5 and the eighth resistor R8 function as current limiting. The sixth resistor R6 is a pull-down resistor of the second switching transistor Q2. The ninth resistor R9 is a pull-down resistor of the fourth switching tube Q4. In addition, the second switching transistor Q2 and the fourth switching transistor Q4 may each employ a transistor, for example, the second switching transistor Q2 employs a second NPN transistor, and the fourth switching transistor Q4 employs a fourth NPN transistor. The base B of the second NPN triode is a first end of the second switching tube Q2, the collector C of the second NPN triode is a third end of the second switching tube Q2, and the emitter E of the second NPN triode is a second end of the second switching tube Q2. The base B of the fourth NPN triode is the first end of the fourth switching tube Q4, the collector C of the fourth NPN triode is the third end of the fourth switching tube Q4, and the emitter E of the fourth NPN triode is the fourth end of the fourth switching tube Q4. Note that, the second switching tube Q2 and the fourth switching tube Q4 may also be MOS tubes. The specific structures of the second switching tube Q2 and the fourth switching tube Q4 are not limited in the embodiment of the present utility model. As long as the corresponding functions can be realized.
In an alternative embodiment, as shown in fig. 3, the solenoid valve control circuit further includes: and one end of the filter circuit 7 is connected with the other end of the zero-crossing detection circuit 1, and the other end of the filter circuit 7 is connected with a third pin of the microprocessor 5. As shown in fig. 2, the filter circuit 7 includes: a first capacitor C1, a second capacitor C2, and a third resistor R3; one end of the first capacitor C1 is connected with one end of the third resistor R3 and the other end of the ZERO-crossing detection circuit 1, the other end of the first capacitor C1 is connected with one end of the second capacitor C2 and grounded, and the other end of the third resistor R3 is connected with the other end of the second capacitor C2 and a third pin ZERO of the microprocessor 5.
Specifically, the filtering circuit 7 is connected to the zero-crossing detection circuit 1, receives the square wave zero-crossing signal or the high level signal output by the zero-crossing detection circuit 1, filters the square wave zero-crossing signal or the high level signal, and outputs the filtered square wave zero-crossing signal or the high level signal to the microprocessor 5, and the microprocessor 5 can control the starting current of the inductive load according to the filtered signal.
The embodiment of the utility model also provides a microwave oven, as shown in fig. 4, comprising the electromagnetic valve 4 and the electromagnetic valve control circuit 10 of the embodiment. As shown in fig. 2, the solenoid valve 4 includes a power pin, a locking winding LOCK and an unlocking winding UNLOCK, the power pin is connected to an external power supply VDD, the locking winding LOCK is connected to a locking control circuit 6 in the solenoid valve control circuit, and the unlocking winding UNLOCK is connected to an unlocking control circuit 3 in the solenoid valve control circuit. Meanwhile, the UNLOCK winding UNLOCK is connected to the power supply pin through the third diode D3, and the LOCK winding LOCK is connected to the power supply pin through the fourth diode D4. Specifically, in order to improve the safety of the operation of the microwave oven, the microwave oven is operated in a secondary door opening mode, that is, each time the door of the microwave oven is opened, two steps are required to be performed to open the door, for example, the door opening button is operated first, and then the door is opened. Through the mode of secondary opening the door, can prevent children's maloperation, improve the security of microwave oven work.
In order to further illustrate the microwave oven of the present utility model, the following is described in detail with a specific solenoid valve control circuit:
As shown in fig. 2, the zero-crossing detection circuit 1 includes a first diode D1, a second diode D2, a second resistor R2, a photocoupler, a power supply, and a first resistor R1; the unlock drive circuit 2 includes a fourth capacitor C4, a fifteenth resistor R15, a fourteenth resistor R14, a sixth switching tube Q6, and a twelfth resistor R12, a third capacitor C3, a thirteenth resistor R13, an eleventh resistor R11, a fifth switching tube Q5, a fifth diode D5, and a tenth resistor R10. The unlock control circuit 3 includes: the locking control circuit 6 comprises an eighth resistor R8, a ninth resistor R9 and a fourth switching tube Q4. The filter circuit 7 includes: the first capacitor C1, the second capacitor C2 and the third resistor R3. The connection relation of each component refers to the embodiment of the electromagnetic valve control circuit, and is not described herein.
The whole machine is electrified, a rectifier circuit formed by a first diode D1, a second diode D2 and a second resistor R2 in the zero-crossing detection circuit 1 rectifies half waves of mains supply, and then the half waves are isolated and transmitted through a photoelectric coupler U1, and a square wave zero-crossing signal with the same frequency as the mains supply is output at the fourth end of the photoelectric coupler U1. The square wave zero crossing signal is input into the unlocking driving circuit 2 to enable the fourth capacitor C4 to be charged and discharged, so that the sixth switching tube Q6 is continuously turned on and off, a direct current high level is output on the third capacitor C3 to enable the fifth switching tube Q5 to be conducted, the voltage of the third end of the fifth switching tube Q5 is pulled down, the fifth diode D5 in the unlocking driving circuit 2 is in an off state, namely the cathode of the fifth diode D5 is in a low level, and the second switching tube Q2 cannot be conducted. The second switching tube Q2 is only controlled by the second pin of the microprocessor 5. I.e. the complete machine is in an energized state, the unlocking winding of the electromagnetic valve 4 is controlled only by the second pin Con 2.
If the whole machine is powered off, the fourth end of the photoelectric coupler U1 in the zero-crossing detection circuit 1 always maintains a high level, after the high level is input into the unlocking driving circuit 2, the fourth capacitor C4 of the unlocking driving circuit 2 is isolated, the sixth switching tube Q6 is turned off, at the moment, the voltage at two ends of the third capacitor C3 is always maintained to be 0 after being rapidly discharged, the fifth switching tube Q5 is turned off, then the fifth diode D5 is forward biased, the second switching tube Q2 in the unlocking control circuit 3 is turned on, and the third end level of the second switching tube Q2 is pulled down, so that the unlocking winding is electrified, unlocking is performed, and the power-off hardware unlocking function is realized.
The locking control circuit 6 is connected with a first pin of the microprocessor 5, and when the first pin outputs a high level, the locking control circuit 6 works to control the locking winding of the electromagnetic valve 4 to be electrified, so that the locking function is realized. Both the locking control circuit 6 and the unlocking control circuit 3 are combined for door lock control when the whole machine is powered on. The filter circuit 7 performs RC filtering on the voltage signal at the fourth terminal of the zero-crossing detection circuit 1 and inputs the voltage signal to the microprocessor 5, so as to control the starting current of the inductive load.
Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and alterations to these embodiments without departing from the spirit of the utility model and the scope of protection as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while remaining within the scope of the present utility model.
Furthermore, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. From the present disclosure, it will be readily understood by those of ordinary skill in the art that processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (10)
1. A solenoid valve control circuit, the solenoid valve control circuit comprising: the device comprises a zero crossing detection circuit, an unlocking driving circuit and an unlocking control circuit;
One end of the zero-crossing detection circuit receives a mains supply input signal, the other end of the zero-crossing detection circuit is connected with one end of the unlocking driving circuit, the other end of the unlocking driving circuit is connected with the first end of the unlocking control circuit, and the second end of the unlocking control circuit is connected with an unlocking winding of the electromagnetic valve.
2. The solenoid valve control circuit of claim 1, wherein the zero crossing detection circuit comprises; a rectifying circuit, an isolating circuit and an unlocking signal generating circuit;
one end of the rectifying circuit is connected with external commercial power, the other end of the rectifying circuit is connected with one end of the isolating circuit, and the other end of the isolating circuit is connected with one end of the unlocking signal generating circuit and one end of the unlocking driving circuit.
3. The solenoid valve control circuit of claim 2, wherein the rectifier circuit comprises: the unlocking signal generating circuit comprises a first resistor, a second resistor and a first diode, wherein the isolation circuit comprises a photoelectric coupler;
The live wire is connected to one end of the second resistor, the second end and the zero line of photoelectric coupler are connected to the positive pole of second diode, the other end of second resistor is connected the positive pole of first diode, the negative pole of first diode is connected the negative pole of second diode and photoelectric coupler's first end, photoelectric coupler's third ground connection, photoelectric coupler's fourth end is connected one end of first resistor and unlocking drive circuit's one end, external power source is connected to the other end of first resistor.
4. The solenoid valve control circuit of claim 1, wherein the unlock drive circuit comprises: a signal conversion circuit, a drive level generation circuit, and a drive signal generation circuit;
One end of the signal conversion circuit is connected with the other end of the zero-crossing detection circuit, the other end of the signal conversion circuit is connected with one end of the driving level generation circuit, the other end of the driving level generation circuit is connected with one end of the driving signal generation circuit, and the other end of the driving signal generation circuit is connected with the first end of the unlocking control circuit.
5. The electromagnetic valve control circuit according to claim 4, wherein the signal conversion circuit includes a fourth capacitor, a fifteenth resistor, a fourteenth resistor, a sixth switching tube, and a twelfth resistor, the drive level generation circuit includes a third capacitor, a thirteenth resistor, an eleventh resistor, and a fifth switching tube, the drive signal generation circuit includes a fifth diode and a tenth resistor;
One end of the fourth capacitor is connected with the other end of the zero-crossing detection circuit, the other end of the fourth capacitor is connected with one end of the fifteenth resistor, the other end of the fifteenth resistor is connected with one end of the fourteenth resistor and the first end of the sixth switch tube, the other end of the fourteenth resistor is connected with the second end of the sixth switch tube and an external power supply, the third end of the sixth switch tube is connected with one end of the twelfth resistor, the other end of the twelfth resistor is connected with one end of the third capacitor, one end of the thirteenth resistor and one end of the eleventh resistor, the other end of the third resistor is connected with the other end of the thirteenth resistor and is grounded, the other end of the eleventh resistor is connected with the first end of the fifth switch tube, the second end of the fifth switch tube is grounded, the third end of the fifth switch tube is connected with the anode of the fifth diode and one end of the tenth resistor, the other end of the tenth resistor is connected with the external power supply, and the cathode of the fifth diode is connected with the first end of the unlocking control circuit.
6. The solenoid valve control circuit of claim 1, further comprising: a microprocessor and a locking control circuit;
The first pin of the microprocessor is connected with one end of the locking control circuit, the other end of the locking control circuit is connected with the locking winding of the electromagnetic valve, and the second pin of the microprocessor is connected with the third end of the unlocking control circuit.
7. The solenoid valve control circuit of claim 6, further comprising: and one end of the filter circuit is connected with the other end of the zero-crossing detection circuit, and the other end of the filter circuit is connected with a third pin of the microprocessor.
8. The solenoid valve control circuit of claim 7, wherein the filter circuit comprises: a first capacitor, a second capacitor and a third resistor;
One end of the first capacitor is connected with one end of the third resistor and the other end of the zero-crossing detection circuit, the other end of the first capacitor is connected with one end of the second capacitor and grounded, and the other end of the third resistor is connected with the other end of the second capacitor and a third pin of the microprocessor.
9. The solenoid valve control circuit of claim 6, wherein the unlock control circuit comprises: the locking control circuit comprises an eighth resistor, a ninth resistor and a fourth switching tube;
One end of the fifth resistor is connected with the second pin of the microprocessor, the other end of the fifth resistor is connected with the other end of the sixth resistor, the first end of the second switching tube and the other end of the unlocking driving circuit, the other end of the sixth resistor is connected with the second end of the second switching tube and grounded, and the third end of the second switching tube is connected with the unlocking winding of the electromagnetic valve;
one end of the eighth resistor is connected with the first pin of the microprocessor, the other end of the eighth resistor is connected with the other end of the ninth resistor and the first end of the fourth switching tube, the other end of the ninth resistor is connected with the second end of the fourth switching tube and grounded, and the third end of the fourth switching tube is connected with the locking winding of the electromagnetic valve.
10. A microwave oven comprising a solenoid valve and a solenoid valve control circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322510015.XU CN220913527U (en) | 2023-09-14 | 2023-09-14 | Solenoid valve control circuit and microwave oven |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322510015.XU CN220913527U (en) | 2023-09-14 | 2023-09-14 | Solenoid valve control circuit and microwave oven |
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| CN220913527U true CN220913527U (en) | 2024-05-07 |
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| CN202322510015.XU Active CN220913527U (en) | 2023-09-14 | 2023-09-14 | Solenoid valve control circuit and microwave oven |
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- 2023-09-14 CN CN202322510015.XU patent/CN220913527U/en active Active
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