Solenoid valve state detection circuit, solenoid valve and electrical equipment

Abstract

The utility model is applicable to the technical field of circuit control, and provides an electromagnetic valve state detection circuit, an electromagnetic valve and electrical equipment, the circuit comprises a control module, an infrared transmitting module and an infrared receiving module, the control end of the control module is connected with the infrared emission module, the infrared receiving module is connected with the detection end of the control module, and the infrared receiving module is used for receiving optical signals emitted by the infrared emission module, converting the optical signals into electric signals and transmitting the electric signals to the detection end of the control module; the infrared transmitting module is arranged on one side of the shaft body, the infrared receiving module is arranged on the other side of the shaft body, when the electromagnetic valve performs the push rod action, the shaft body shields the infrared receiving module, and light signals received by the infrared receiving module are reduced; when the electromagnetic valve performs pull rod action, the shaft body is displayed on the infrared receiving module, and an optical signal received by the infrared receiving module is increased; and the control module is used for determining that the electromagnetic valve fails if the electric signal input by the detection end does not change within the preset time after the electromagnetic valve is controlled to act.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit control, and in particular relates to a solenoid valve state detection circuit, a solenoid valve and electrical equipment. Background Art

[0002] In order to meet the double door opening requirements of the new UL standard, some microwave ovens use solenoid valves. The solenoid valve has two windings, one winding (referred to as the locking winding) is used for the push rod action (shaft out) after power is turned on, and the other winding (referred to as the unlocking winding) is used for the pull rod action (shaft in) after power is turned on. The combination of the two can be used as a door lock control to achieve a single door opening and closing action.

[0003] However, the traditional solenoid valve control does not have a solenoid valve status feedback mechanism. When the solenoid valve control fails, the door cannot be opened and closed normally, and no error message can be given, resulting in a poor user experience. Utility Model Content

[0004] In view of this, the embodiments of the present invention provide a solenoid valve state detection circuit, a solenoid valve and an electrical device to solve the problem that the current solenoid valve control mechanism cannot feedback the control state of the solenoid valve.

[0005] In a first aspect, an embodiment of the utility model provides a solenoid valve state detection circuit, the solenoid valve includes a shaft body, and the circuit includes a control module, an infrared transmitting module and an infrared receiving module;

[0006] The control end of the control module is connected to the infrared transmitting module, and the infrared receiving module is connected to the detection end of the control module. The infrared receiving module is used to receive the optical signal emitted by the infrared transmitting module and convert the optical signal into an electrical signal and transmit it to the detection end of the control module;

[0007] The infrared transmitting module is arranged on one side of the shaft body, and the infrared receiving module is arranged on the other side of the shaft body. The infrared transmitting module and the infrared receiving module constitute an infrared pair tube structure. When the solenoid valve performs a push rod action, the shaft body blocks the infrared receiving module, and the light signal received by the infrared receiving module decreases; when the solenoid valve performs a pull rod action, the shaft body reveals the infrared receiving module, and the light signal received by the infrared receiving module increases.

[0008] The control module is used to determine that the solenoid valve has failed if the electrical signal input from the detection end does not change within a preset time after the solenoid valve is controlled to operate.

[0009] By placing the infrared transmitting module and the infrared receiving module that constitute the infrared pair tube structure on both sides of the solenoid valve shaft, the push rod action or pull rod action of the solenoid valve affects the size of the light signal received by the infrared receiving module, and then the change of the incoming electrical signal converted from the light signal fed back by the infrared receiving tube can be used to determine whether the control of the solenoid valve has failed, thereby realizing the state detection of the solenoid valve.

[0010] In some optional embodiments, the infrared transmitting module includes an infrared transmitting tube, and the infrared receiving module includes an infrared receiving tube;

[0011] The control end of the control module is connected to the infrared emitting tube and is used to drive the infrared emitting tube to emit a light signal;

[0012] The infrared receiving tube and the infrared transmitting tube form an infrared pair tube structure. The infrared receiving tube is connected to the detection end of the control module. The infrared receiving tube receives the light signal emitted by the infrared transmitting tube and converts the light signal into an electrical signal and transmits it to the detection end of the control module.

[0013] Therefore, the conversion of optical signals into electrical signals is realized by using infrared receiving tubes and infrared transmitting tubes, which has low cost, small space occupation, and strong anti-electromagnetic interference capability by using optical signal transmission.

[0014] In some optional embodiments, the infrared receiving module further includes a first resistor;

[0015] The first pin of the infrared receiving tube is connected to one end of the first resistor, and the other end of the first resistor is connected to a preset power supply voltage;

[0016] When the light signal received by the infrared receiving tube decreases, the voltage of the first resistor decreases, causing the voltage of the first pin to increase; when the light signal received by the infrared receiving tube increases, the voltage of the first resistor increases, causing the voltage of the first pin to decrease.

[0017] Therefore, when the optical signal received by the infrared receiving tube changes, the size of the converted electrical signal is affected by setting the first resistor.

[0018] In some optional embodiments, the infrared receiving module further includes a first capacitor and a second resistor, wherein the first capacitor and the second resistor form a filter structure;

[0019] The infrared receiving tube is connected to the detection end of the control module via a filter structure.

[0020] Therefore, the electric signal is filtered through the filter structure composed of the first capacitor and the second resistor, thereby reducing the influence of noise signal interference.

[0021] In some optional implementations, the first pin of the infrared receiving tube is connected to the first end of the second resistor, and the second end of the second resistor is connected to the first end of the first capacitor and the detection end of the control module respectively;

[0022] The second pin of the infrared receiving tube is connected to the second end of the first capacitor and then grounded.

[0023] In some optional implementations, the circuit further includes a failure prompting device.

[0024] Therefore, by setting a failure prompt device, an error signal is issued after the solenoid valve fails.

[0025] In some optional implementations, the failure prompt device is a speaker or an indicator light.

[0026] In some optional implementations, the control module is a single chip microcomputer.

[0027] In a second aspect, an embodiment of the utility model provides a solenoid valve, which includes a shaft body, and the solenoid valve also includes the solenoid valve state detection circuit of the above-mentioned first aspect or any corresponding embodiment thereof.

[0028] In a third aspect, an embodiment of the utility model provides an electrical device, which includes the solenoid valve of the second aspect.

[0029] In some optional embodiments, the electrical appliance is a microwave oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It is a structural block diagram of the electrical equipment provided by the embodiment of the utility model;

[0032] Figure 2 It is a structural block diagram of the solenoid valve provided by the embodiment of the utility model;

[0033] Figure 3 It is a structural block diagram of a solenoid valve state detection circuit provided by an embodiment of the utility model;

[0034] Figure 4 It is a structural schematic diagram of a solenoid valve state detection circuit provided by an embodiment of the utility model;

[0035] Figure 5 It is a structural schematic diagram of a specific application circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0036] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] According to an embodiment of the utility model, an electrical device is provided, such as Figure 1 As shown, the electrical device includes a solenoid valve 10. The solenoid valve 10 is used to control the door opening and closing action of the electrical device. For example, the embodiment of the utility model is described by taking the electrical device as a microwave oven as an example. In actual application, the electrical device can also be other electrical devices that need to perform door opening and closing actions, such as an oven, etc., and the utility model is not limited to this.

[0041] According to an embodiment of the utility model, a solenoid valve is provided, such as Figure 2 As shown, the solenoid valve 10 includes a solenoid valve state detection circuit 20 and a shaft body 30. The solenoid valve 10 can be applied to Figure 1 The electrical equipment shown.

[0042] Specifically, the solenoid valve 10 also includes a locking winding and an unlocking winding (in Figure 2 Not shown in the figure), wherein the locking winding can drive the shaft body 30 to move out so that the solenoid valve 10 performs a push rod action, and the unlocking winding can drive the shaft body 30 to move in so that the solenoid valve 10 performs a pull rod action.

[0043] According to an embodiment of the utility model, a solenoid valve state detection circuit is provided, which can be applied to Figure 2 The solenoid valve 10 shown in FIG. Figure 3 As shown, the solenoid valve state detection circuit 20 includes a control module 21, an infrared transmitting module 22 and an infrared receiving module 23. Among them, the control end of the control module 21 is connected to the infrared transmitting module 22, and the infrared receiving module 23 is connected to the detection end of the control module 21. The infrared receiving module 23 is used to receive the optical signal emitted by the infrared transmitting module 22, and convert the optical signal into an electrical signal and transmit it to the detection end of the control module 21.

[0044] In addition, the infrared transmitting module 22 is arranged on one side of the shaft body 30, and the infrared receiving module 23 is arranged on the other side of the shaft body 30. The infrared transmitting module 22 and the infrared receiving module 23 constitute an infrared pair tube structure. When the solenoid valve 10 performs a pushing rod action, the shaft body 30 blocks the infrared receiving module 23, and the light signal received by the infrared receiving module 23 decreases; when the solenoid valve 10 performs a pulling rod action, the shaft body 30 reveals the infrared receiving module 23, and the light signal received by the infrared receiving module 23 increases.

[0045] In addition, the control module 21 is used to determine that the solenoid valve 10 is inoperative if the electrical signal input from the detection end does not change within a preset time after the solenoid valve 10 is controlled to operate.

[0046] Specifically, when the solenoid valve 10 pushes or pulls the rod, the light signal received by the infrared receiving module 23 changes, and the converted electrical signal also changes. Therefore, the control module 21 can judge whether the control of the solenoid valve 10 fails by the change of the electrical signal input from the detection end within a period of time. Exemplarily, the change of the electrical signal input from the detection end within a period of time can be obtained by setting an electrical signal detection circuit in the control module 21. For details, please refer to the description of the relevant technology, which will not be repeated here.

[0047] Since the solenoid valve 10 relies on the shaft 30 to realize the door opening and closing, that is, the push rod action (shaft out) realizes the door locking function, and the pull rod action (shaft in) realizes the door opening function, then the infrared transmitting module 22 and the infrared receiving module 23 that constitute the infrared pair tube structure can be placed on both sides of the shaft 30, for example, installed on the valve body to detect the position of the shaft, so as to judge whether the control of the solenoid valve 10 fails through the electrical signal fed back by the infrared receiving module 23, thereby realizing the feedback of the door lock status information of the electrical equipment.

[0048] Therefore, by placing the infrared transmitting module and the infrared receiving module that constitute the infrared pair tube structure on both sides of the solenoid valve shaft, the push rod action or pull rod action of the solenoid valve affects the size of the light signal received by the infrared receiving module, so that the control of the solenoid valve fails can be judged by the change of the incoming electric signal converted from the light signal fed back by the infrared receiving tube, thereby realizing the state detection of the solenoid valve, which is low-cost and easy to implement.

[0049] In some optional implementations, the control module 21 may be a single chip microcomputer. In practical applications, the control module 21 may also be other chips with a solenoid valve state detection function such as an MCU, etc., but the present invention is not limited thereto.

[0050] Specifically, the control module 21 provides compensation control when the solenoid valve 10 fails to operate, thereby improving the reliability of the solenoid valve operation.

[0051] In some optional embodiments, the solenoid valve state detection circuit 20 further includes a failure prompt device for sending an error signal after the control module 21 determines that the solenoid valve 10 has failed. For example, the failure prompt device can be a speaker or an indicator light, but the present invention is not limited thereto.

[0052] In some optional embodiments, such as Figure 4 As shown, the infrared transmitting module 22 includes an infrared transmitting tube LD1, and the infrared receiving module 23 includes an infrared receiving tube PT1.

[0053] Specifically, the control end of the control module 21 is connected to the infrared emitting tube LD1, and is used to drive the infrared emitting tube LD1 to emit a light signal. The infrared receiving tube PT1 and the infrared emitting tube LD1 form an infrared pair tube structure, and the infrared receiving tube PT1 is connected to the detection end of the control module 21. The infrared receiving tube PT1 receives the light signal emitted by the infrared emitting tube LD1, and converts the light signal into an electrical signal and transmits it to the detection end of the control module 21.

[0054] Therefore, the conversion of optical signals into electrical signals is realized by using the infrared receiving tube PT1 and the infrared transmitting tube LD1, which has low cost, small space occupation, and strong anti-electromagnetic interference capability by using optical signal transmission.

[0055] In some optional embodiments, see again Figure 4 The infrared receiving module 23 may further include a first resistor R4. The first pin (positive electrode) of the infrared receiving tube PT1 is connected to one end of the first resistor R4, and the other end of the first resistor R4 is connected to a preset power supply voltage VCC.

[0056] When the light signal received by the infrared receiving tube PT1 decreases, the voltage of the first resistor R4 decreases, causing the voltage of the first pin (positive electrode) to increase; when the light signal received by the infrared receiving tube PT1 increases, the voltage of the first resistor R4 increases, causing the voltage of the first pin (positive electrode) to decrease.

[0057] Specifically, since the output of the electromagnetic valve 10 blocks the infrared light, the amount of light received by the infrared receiving tube PT1 decreases, which reduces the current between the two pins of PT1, causing the voltage of the first resistor R4 to decrease, and the positive voltage of PT1 to increase. Since the input of the electromagnetic valve 10 does not block the infrared light, the amount of light received by the infrared receiving tube PT1 increases, which increases the current between the two pins of PT1, causing the voltage of the first resistor R4 to increase, and the positive voltage of PT1 to decrease.

[0058] Therefore, when the optical signal received by the infrared receiving tube changes, the size of the converted electrical signal is affected by setting the first resistor.

[0059] In some optional embodiments, see again Figure 4 The infrared receiving module 23 further includes a first capacitor C60 and a second resistor R10, wherein the first capacitor C60 and the second resistor R10 form a filter structure, and the infrared receiving tube PT1 is connected to the detection end of the control module 21 via the filter structure.

[0060] Specifically, see again Figure 4 The first pin (positive pole) of the infrared receiving tube PT1 is connected to the first end of the second resistor R10, the second end of the second resistor R10 is respectively connected to the first end of the first capacitor C60 and the detection end of the control module 21, and the second pin (negative pole) of the infrared receiving tube PT1 is connected to the second end of the first capacitor C60 and then grounded.

[0061] Therefore, the electric signal is filtered through the filter structure composed of the first capacitor C60 and the second resistor R10, thereby reducing the influence of noise signal interference.

[0062] The solenoid valve state detection circuit in the above embodiment places the infrared transmitting tube and the infrared receiving tube constituting the infrared pair tube structure on both sides of the solenoid valve shaft, and affects the size of the light signal received by the infrared receiving tube through the shaft output or shaft input of the solenoid valve, thereby judging whether the control of the solenoid valve fails through the change of the incoming electrical signal converted from the light signal fed back by the infrared receiving tube, thereby realizing the state detection of the solenoid valve, with low cost and easy implementation.

[0063] The utility model provides a specific application circuit to further illustrate the embodiment of the utility model. Figure 5As shown, the circuit is applied to a microwave oven for explanation below. The circuit includes a single-chip control module 21, an infrared transmitting module 22, an infrared receiving module 23, an unlocking winding driving module 24, a locking winding driving module 25 and a solenoid valve 10. The solenoid valve 10 is composed of two windings, whose common end is connected to the power supply +VDD and matched with freewheeling diodes D3 and D4; the single-chip control module 21 is a single-chip microcomputer.

[0064] After the microwave oven is powered on and the microwave is started, the Con3 control signal of the single-chip control module 21 drives the infrared transmitting module 22 to make the infrared transmitting tube LD1 work and emit infrared light. At the same time, the infrared receiving tube PT1 of the infrared receiving module 23 receives the infrared light. PT1 converts the optical signal into an electrical signal. Then the voltage signal of pin 1 of PT1 passes through the RC filter composed of the second resistor R10 and the first capacitor C60 and is sent to the AD port of the single-chip control module 21 for detection by the single-chip microcomputer.

[0065] Furthermore, the Con1 control signal of the single-chip control module 21 drives the locking winding drive module 25, so that the solenoid valve 10 performs a push rod action, that is, the shaft is out, and the door is locked. At this time, due to the shaft out of the solenoid valve 10, the infrared light is blocked, so that the amount of light received by the infrared receiving tube PT1 decreases, which will reduce the current between the 1st and 2nd pins of PT1, causing the voltage of the first resistor R4 to decrease, and then the voltage of the 1st pin of PT1 will increase, and input to the AD port of the single-chip computer for judgment. If the AD value does not actually change, then it can be known that the locking action of the solenoid valve fails, and the compensation drive can be used again. If it still fails, the single-chip computer will output an error signal to remind the user to repair it.

[0066] Furthermore, if cooking is finished for a period of time (the temperature of the whole machine is reduced) or the user presses the unlock button to unlock (i.e., open the door), the Con2 control signal of the single-chip control module 21 drives the unlock winding drive module 24, so that the solenoid valve 10 performs a pull rod action, i.e., the shaft is inserted, and the first door opening action is realized. At this time, since the shaft of the solenoid valve 10 is inserted, the infrared tube is not blocked, so that the amount of light received by the infrared receiving tube PT1 increases, then the current between the 1st and 2nd pins of PT1 will increase, causing the voltage of the first resistor R4 to increase, then the voltage of the 1st pin of PT1 will decrease, and it will be input to the AD port of the single-chip computer for judgment. If the AD value does not actually change, then it can be known that the unlocking action of the solenoid valve fails, and the compensation drive can be used again. If it still fails, then the single-chip computer will output an error signal to remind the user to repair it.

[0067] Specifically, after the whole machine is powered on (starting to work) or the user presses the unlock button to unlock, the infrared emitting tube is turned on to emit infrared light, without increasing the standby power consumption.

[0068] The above-mentioned specific application circuit mainly affects the amount of light received by the infrared receiving tube through the shaft output and shaft input of the solenoid valve, converts it into the difference of electrical signals, and then recognizes it by the single-chip microcomputer, so as to judge the action state of the solenoid valve and further identify the door lock state of the microwave oven.

[0069] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A solenoid valve state detection circuit, the solenoid valve comprising a shaft, characterized in that: The circuit includes a control module, an infrared transmitting module and an infrared receiving module; The control end of the control module is connected to the infrared transmitting module, and the infrared receiving module is connected to the detection end of the control module. The infrared receiving module is used to receive the optical signal emitted by the infrared transmitting module and convert the optical signal into an electrical signal and transmit it to the detection end of the control module; The infrared transmitting module is arranged on one side of the shaft body, and the infrared receiving module is arranged on the other side of the shaft body. The infrared transmitting module and the infrared receiving module constitute an infrared pair tube structure. When the solenoid valve performs a push rod action, the shaft body shields the infrared receiving module, and the light signal received by the infrared receiving module decreases; when the solenoid valve performs a pull rod action, the shaft body reveals the infrared receiving module, and the light signal received by the infrared receiving module increases. The control module is used to determine that the solenoid valve is failed if the electrical signal input from the detection end does not change within a preset time after controlling the solenoid valve to operate.

2. The solenoid valve state detection circuit according to claim 1, characterized in that: The infrared transmitting module includes an infrared transmitting tube, and the infrared receiving module includes an infrared receiving tube; The control end of the control module is connected to the infrared emitting tube, and is used to drive the infrared emitting tube to emit a light signal; The infrared receiving tube and the infrared transmitting tube form an infrared pair tube structure, the infrared receiving tube is connected to the detection end of the control module, the infrared receiving tube receives the light signal emitted by the infrared transmitting tube, and converts the light signal into an electrical signal and transmits it to the detection end of the control module.

3. The solenoid valve state detection circuit according to claim 2, characterized in that: The infrared receiving module also includes a first resistor; The first pin of the infrared receiving tube is connected to one end of the first resistor, and the other end of the first resistor is connected to a preset power supply voltage; When the light signal received by the infrared receiving tube decreases, the voltage of the first resistor decreases, so that the voltage of the first pin increases; when the light signal received by the infrared receiving tube increases, the voltage of the first resistor increases, so that the voltage of the first pin decreases.

4. The solenoid valve state detection circuit according to claim 3, characterized in that: The infrared receiving module further comprises a first capacitor and a second resistor, wherein the first capacitor and the second resistor form a filter structure; The infrared receiving tube is connected to the detection end of the control module via the filter structure.

5. The solenoid valve state detection circuit according to claim 4, characterized in that: The first pin of the infrared receiving tube is connected to the first end of the second resistor, and the second end of the second resistor is connected to the first end of the first capacitor and the detection end of the control module respectively; The second pin of the infrared receiving tube is connected to the second end of the first capacitor and then grounded.

6. The solenoid valve state detection circuit according to claim 1, characterized in that: The circuit also includes a failure prompting device.

7. The solenoid valve state detection circuit according to claim 6, characterized in that: The failure prompting device is a speaker or an indicator light.

8. The solenoid valve state detection circuit according to claim 1, characterized in that: The control module is a single chip microcomputer.

9. A solenoid valve, comprising a shaft, characterized in that: The solenoid valve further comprises: a solenoid valve state detection circuit as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: The electrical device comprises the solenoid valve according to claim 9.

11. The electrical device according to claim 10, characterized in that: The electrical appliance is a microwave oven.

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