A solenoid valve detection circuit, circuit board, and gas water heater

Abstract

This invention discloses a solenoid valve control circuit, circuit board, and gas water heater. The solenoid valve control circuit includes: a main valve, a main valve drive circuit electrically connected to the main valve, at least one segmented valve, at least one segmented valve drive circuit electrically connected to the segmented valve, a detection circuit, and a control module. The control module generates a solenoid valve control signal and inputs it to the corresponding main valve drive circuit or segmented valve drive circuit to energize the corresponding main valve or segmented valve, and generates a feedback signal for the main valve or segmented valve. The detection circuit converts the feedback signal into a solenoid valve detection signal and feeds it back to the control module, allowing the control module to determine whether the main valve or segmented valve is in normal operating condition based on the solenoid valve detection signal. This invention ensures the normal operation of the gas water heater.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic valve control technology, and in particular to an electromagnetic valve control circuit, circuit board, and gas water heater. Background Technology

[0002] The solenoid valve is the core component of a gas water heater. It automatically controls the temperature by controlling the combustion of natural gas or coal gas. The solenoid valve is a safety emergency shut-off device. When the solenoid valve malfunctions or the drive circuit is abnormal, it will issue a warning and shut off the gas valve to ensure the safety of the gas water heater.

[0003] Gas water heater solenoid valves generally use DC voltage control. Since the solenoid valve is an inductive load, meaning the load current lags the load voltage by a phase difference, pulse voltage control is used to reduce power consumption and extend the valve's lifespan. Gas water heaters actually operate with segmented combustion, which refers to controlling the number of burners in the combustion chamber. At the highest setting, all solenoid valves are open, and all burners are burning. At other settings, temperature control is achieved by closing some solenoid valves on fewer burners. Therefore, gas water heaters contain multiple solenoid valves, including a main valve, segmented valve 1, segmented valve 2, and segmented valve 3. The normal opening, closing, and malfunction of each solenoid valve must be promptly reported to the controller to ensure the normal operation of the gas water heater.

[0004] Currently, in order to ensure the normal use of gas water heaters, existing technical solutions employ a method of individually testing each solenoid valve of the gas water heater. This method involves complex circuitry, high costs, and requires a significant amount of microcontroller port resources, resulting in poor portability. Summary of the Invention

[0005] This invention provides an electromagnetic valve control circuit, a circuit board, and a gas water heater to achieve real-time and accurate detection of electromagnetic valve faults, ensuring the normal operation of the gas water heater.

[0006] In a first aspect, embodiments of the present invention provide a solenoid valve control circuit, the solenoid valve control circuit comprising:

[0007] The system includes a main valve, a main valve drive circuit electrically connected to the main valve, at least one sectional valve, at least one sectional valve drive circuit electrically connected to the sectional valve, a detection circuit, and a control module.

[0008] The control module is communicatively connected to the main valve drive circuit and the segmented valve drive circuit, respectively. The control module is used to generate a solenoid valve control signal and input the solenoid valve control signal to the main valve drive circuit or the segmented valve drive circuit corresponding to the solenoid valve control signal, so as to control the main valve drive circuit or the segmented valve drive circuit to drive the corresponding main valve or the segmented valve to be energized, and generate a feedback signal of the main valve or the segmented valve.

[0009] The detection circuit is communicatively connected to the main valve and at least one of the segmented valves, and electrically connected to the control module. The detection circuit is used to convert the feedback signal into a solenoid valve detection signal and feed the solenoid valve detection signal back to the control module so as to control the control module to determine whether the main valve or the segmented valve is in normal operating condition based on the solenoid valve detection signal.

[0010] Optionally, the segmented valve drive circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, and a first diode;

[0011] The signal output terminal of the control module is electrically connected to the first terminal of the first resistor. The second terminal of the first resistor is electrically connected to the control terminal of the first transistor and the first terminal of the second resistor. The first terminal of the first transistor is electrically connected to the first terminal of the third resistor. The second terminal of the second resistor and the second terminal of the first transistor are grounded. The second terminal of the third resistor is electrically connected to the first terminal of the fourth resistor and the control terminal of the second transistor. The second terminal of the fourth resistor is electrically connected to the first terminal of the second transistor, the first terminal of the fifth resistor, and the power supply terminal. The second terminal of the second transistor is electrically connected to the second terminal of the fifth resistor and the negative terminal of the first diode. The positive terminal of the first diode is grounded.

[0012] Optionally, the first end of the segmented valve is electrically connected to the second end of the second transistor, the second end of the fifth resistor, and the negative terminal of the first diode, respectively, and the second end of the segmented valve is electrically connected to the positive terminal of the first diode.

[0013] Optionally, the main valve drive circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a rectifier capacitor, a second diode, a third diode, a third transistor, and a fourth transistor.

[0014] The signal output terminal of the control module is electrically connected to the first terminal of the sixth resistor and the positive terminal of the rectifier capacitor, respectively. The second terminal of the sixth resistor is grounded. The negative terminal of the rectifier capacitor is electrically connected to the first terminal of the seventh resistor. The second terminal of the seventh resistor is electrically connected to the negative terminal of the second diode and the control terminal of the third transistor, respectively. The positive terminal of the second diode is grounded. The first terminal of the third transistor is electrically connected to the first terminal of the eighth resistor, respectively. The second terminal of the third transistor is grounded. The second terminal of the eighth resistor is electrically connected to the first terminal of the ninth resistor and the control terminal of the fourth transistor, respectively. The second terminal of the ninth resistor is electrically connected to the first terminal of the fourth transistor, the first terminal of the tenth resistor, and the power supply terminal, respectively. The second terminal of the fourth transistor is electrically connected to the second terminal of the tenth resistor and the negative terminal of the third diode, respectively. The positive terminal of the third diode is grounded.

[0015] Optionally, the first end of the main valve is electrically connected to the second end of the fourth transistor, the second end of the tenth resistor, and the negative terminal of the third diode, respectively, and the second end of the main valve is electrically connected to the positive terminal of the third diode.

[0016] Optionally, the detection circuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth transistor, a main valve resistor, and at least one segmented valve resistor;

[0017] The first end of the main valve resistor is electrically connected to the first end of the main valve. The second end of the main valve resistor is electrically connected to the first end of the eleventh resistor and the control end of the fifth transistor. The first end of the segmented valve resistor is electrically connected to the first end of the segmented valve. The second end of the segmented valve resistor is electrically connected to the first end of the eleventh resistor and the control end of the fifth transistor. The second end of the eleventh resistor is grounded. The first end of the fifth transistor is electrically connected to the first end of the twelfth resistor and the first end of the thirteenth resistor. The second end of the twelfth resistor is electrically connected to the power supply terminal. The second end of the thirteenth resistor is electrically connected to the signal input terminal of the control module. The second end of the fifth transistor is grounded.

[0018] Optionally, the solenoid valve control signal is a high-level signal, the main valve drive circuit or the segmented valve drive circuit receives the high-level signal, outputs the feedback signal as a high-level signal, the fifth transistor is turned on, and the detection circuit outputs the solenoid valve detection signal as a low-level signal.

[0019] Optionally, the solenoid valve control signal is a low-level signal, the main valve drive circuit or the segmented valve drive circuit receives the low-level signal, outputs the feedback signal as a low-level signal, the fifth transistor is turned off, and the detection circuit outputs the solenoid valve detection signal as a high-level signal.

[0020] Secondly, embodiments of the present invention also provide a circuit board, which includes the solenoid valve detection circuit provided in the first aspect of the present invention.

[0021] Thirdly, embodiments of the present invention also provide a gas water heater, which includes the circuit board described in the second aspect of the present invention.

[0022] The technical solution of this invention includes a solenoid valve detection circuit comprising a main valve, a main valve drive circuit electrically connected to the main valve, at least one segmented valve, at least one segmented valve drive circuit electrically connected to the segmented valve, a detection circuit, and a control module. The control module is communicatively connected to both the main valve drive circuit and the segmented valve drive circuit. The control module generates a solenoid valve control signal and inputs the solenoid valve control signal to the corresponding main valve drive circuit or segmented valve drive circuit to control the main valve drive circuit or segmented valve drive circuit to energize the corresponding main valve or segmented valve, and generates a feedback signal for the main valve or segmented valve. The detection circuit is communicatively connected to both the main valve and at least one segmented valve, and electrically connected to the control module. The detection circuit converts the feedback signal into a solenoid valve detection signal and feeds the solenoid valve detection signal back to the control module to control the control module to determine whether the main valve or segmented valve is in normal operating condition based on the solenoid valve detection signal. This solution addresses the problems of existing solutions that require individual testing of each solenoid valve in a gas water heater, which involves complex circuitry, high costs, and significant resource consumption by the controller's microcontroller, resulting in poor portability. The goal is to achieve real-time and accurate detection of solenoid valve faults, ensuring the normal operation of the gas water heater. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an electromagnetic valve control circuit provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the segmented valve drive circuit and the segmented valve provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the main valve drive circuit and the main valve provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the detection circuit provided in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of an electromagnetic valve control circuit provided in an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0029] It should also be noted that, for ease of description, the accompanying drawings show only the parts relevant to the invention and not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but it may also have additional steps not included in the drawings. The process may correspond to a method, function, procedure, subroutine, subprogram, etc.

[0030] Figure 1 This is a schematic diagram of a solenoid valve control circuit according to an embodiment of the present invention. This embodiment is applicable to situations requiring real-time detection of various abnormal conditions of the solenoid valve. The specific structure of the solenoid valve control circuit is as follows:

[0031] The system includes a main valve 110, a main valve drive circuit 111 electrically connected to the main valve 110, at least one segment valve 120, at least one segment valve drive circuit 121 electrically connected to the segment valve 120, a detection circuit 130, and a control module 140.

[0032] The control module 140 is communicatively connected to the main valve drive circuit 111 and the segmented valve drive circuit 121, respectively. The control module 140 is used to generate a solenoid valve control signal and input the solenoid valve control signal to the main valve drive circuit 111 or the segmented valve drive circuit 121 corresponding to the solenoid valve control signal, so as to control the main valve drive circuit 111 or the segmented valve drive circuit 121 to drive the corresponding main valve 110 or the segmented valve 120 to be energized, and generate a feedback signal for the main valve 110 or the segmented valve 120.

[0033] The detection circuit 130 is communicatively connected to the main valve 110 and at least one of the segmented valves 120, and electrically connected to the control module 140. The detection circuit 130 is used to convert the feedback signal into a solenoid valve detection signal and feed the solenoid valve detection signal back to the control module 140 so as to control the control module 140 to determine whether the main valve 110 or the segmented valve 120 is in normal operating condition based on the solenoid valve detection signal.

[0034] The gas water heater contains multiple solenoid valves, including a main valve 110 and at least one segmented valve 120. The number of segmented valves 120 can be one, two, or more. For example, the gas water heater in this embodiment includes one main valve 110 and three segmented valves 120.

[0035] All segmented valves 120 have the same segmented valve drive circuit 121. All segmented valves 120 can be distinguished by labeling, such as segmented valve 1201, segmented valve 1202, and segmented valve 1203. Other marking methods can also be used to distinguish segmented valves 120. In this embodiment, no restrictions are placed on the way segmented valves 120 in the same gas water heater are distinguished.

[0036] Optionally, the coil resistance of the main valve 110 or the sectional valve 120 is in the range of 80Ω to 100 ohms.

[0037] In this embodiment, the detection of the solenoid valves, namely the detection of the main valve 110 and at least one segment valve 120, is achieved by the control module 140 generating solenoid valve control signals and inputting these signals to the solenoid valves. Optionally, the control module 140 can be a microcontroller.

[0038] It is understandable that the solenoid valve control signal can be a square wave signal, and the output frequency range of the solenoid valve control signal is between 50Hz and 500Hz.

[0039] For example, when the solenoid valve control signal is a high-level signal, the voltage of the main valve 110 or the segment valve 120 is the power supply terminal voltage. At this time, the feedback signal is a high-level signal, the detection circuit 130 receives the high-level signal, and outputs a low-level signal for the solenoid valve detection signal. When the solenoid valve control signal is a low-level signal, the feedback signal is a low-level signal, the detection circuit 130 receives the low-level signal, and outputs a high-level signal for the solenoid valve detection signal.

[0040] In this embodiment, the power supply terminal refers to the control voltage of the solenoid valve, that is, the control voltage corresponding to the main valve 110 or the segment valve 120.

[0041] It is understood that the above signal detection principle applies to each solenoid valve of the main valve 110 and at least one segment valve 120. When the main valve drive circuit 111 and the segment valve drive circuit 121, the main valve 110 and the segment valve 120 are fault-free, the solenoid valve control signal generated by the control module 140 is a square wave signal, and the solenoid valve detection signal output by the detection circuit 130 is a square wave signal.

[0042] To more accurately pinpoint which solenoid valve (i.e., main valve 110 or segmented valve 120) is malfunctioning, the control module 140 outputs a microsecond-level pulse signal in real time during normal operation or standby of the gas water heater. This pulse signal will not cause the solenoid valve to operate. At the same time, the detection circuit 130 detects whether there is a solenoid valve detection signal input to determine whether the solenoid valve drive circuit is normal. The main valve 110 and at least one segmented valve 120 output independently, thereby realizing real-time detection of the solenoid valve control circuit and whether its operation is normal.

[0043] Figure 2 This is a schematic diagram of the segmented valve drive circuit 121 and the segmented valve 120 provided in an embodiment of the present invention. See also... Figure 2 Based on the above embodiments, the segmented valve drive circuit 121 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor T1, a second transistor T2, and a first diode D1.

[0044] The signal output terminal of the control module 140 is electrically connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is electrically connected to the control terminal of the first transistor T1 and the first terminal of the second resistor R2. The first terminal of the first transistor T1 is electrically connected to the first terminal of the third resistor R3. The second terminal of the second resistor R2 and the second terminal of the first transistor T1 are grounded. The second terminal of the third resistor R3 is electrically connected to the first terminal of the fourth resistor R4 and the control terminal of the second transistor T2. The second terminal of the fourth resistor R4 is electrically connected to the first terminal of the second transistor T2, the first terminal of the fifth resistor R5, and the power supply terminal. The second terminal of the second transistor T2 is electrically connected to the second terminal of the fifth resistor R5 and the negative terminal of the first diode D1. The positive terminal of the first diode D1 is grounded.

[0045] See also Figure 1 and Figure 2 The signal output terminal of the control module 140 generates a solenoid valve control signal and inputs the solenoid valve control signal to the segmented valve drive circuit 121 corresponding to the solenoid valve control signal.

[0046] When the solenoid valve control signal is a high-level signal, the first transistor T1 is turned on, and the control terminal of the second transistor T2 is a low-level signal. Then the second transistor T2 is turned on. At this time, the port connected to the positive terminal of the first diode D1 of the segmented valve 120 is the power supply voltage, and the power supply voltage signal is input to the detection circuit 130.

[0047] When the solenoid valve control signal is low, the first transistor T1 is turned off, and the second transistor T2 is turned off. At this time, the port voltage U connected to the positive terminal of the first diode D1 of the segmented valve 120 is the voltage division between the segmented valve 120 and the third resistor R3, which can be expressed by the formula... Therefore, it is understandable that as long as the resistance value of the third resistor R3 is within a reasonable range, the detection circuit 130 will not detect the input voltage signal.

[0048] Specifically, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are all used for current limiting, thereby protecting the segmented valve drive circuit 121. The fifth resistor R5 is used to share the leakage current generated in the segmented valve drive circuit 121, so that the first diode D1 can be reliably kept in the cut-off state, protecting the segmented valve 120 and improving the reliability of the segmented valve drive circuit 121.

[0049] For example, the resistance of the first resistor R1 is 4.7K, the resistance of the second resistor R2 and the fourth resistor R4 can be in the range of 10K, the resistance of the third resistor R3 is 7.5K-1206, and the resistance of the fifth resistor is 56K.

[0050] See also Figure 2 Based on the above embodiments, the first end of the segmented valve 120 is electrically connected to the second end of the second transistor T2, the second end of the fifth resistor R5, and the negative terminal of the first diode D1, respectively, and the second end of the segmented valve 120 is electrically connected to the positive terminal of the first diode D1.

[0051] See also Figure 1 and Figure 2 The first end of the segmented valve 120 is electrically connected to the detection circuit 130. The second end of the second transistor T2, the second end of the fifth resistor R5, and the negative terminal of the first diode D1 are electrically connected to the detection circuit 130. The positive terminal of the first diode D1 is grounded.

[0052] Specifically, the first end of the segmented valve 120 outputs a feedback signal, which is then input to the detection circuit 130. The detection circuit 130 determines the solenoid valve detection signal based on the feedback signal, thereby determining whether the segmented valve 120 is in normal operating condition.

[0053] Figure 3 This is a schematic diagram of the main valve drive circuit 111 and the main valve 110 provided in an embodiment of the present invention. See [link / reference]. Figure 3 Based on the above embodiments, the main valve drive circuit 111 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a rectifier capacitor E1, a second diode D2, a third diode D3, a third transistor T3, and a fourth transistor T4.

[0054] The signal output terminal of the control module 140 is electrically connected to the first terminal of the sixth resistor R6 and the positive terminal of the rectifier capacitor E1, respectively. The second terminal of the sixth resistor R6 is grounded. The negative terminal of the rectifier capacitor E1 is electrically connected to the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is electrically connected to the negative terminal of the second diode D2 and the control terminal of the transistor, respectively. The positive terminal of the second diode D2 is grounded. The first terminal of the third transistor T3 is electrically connected to the first terminal of the eighth resistor R8, respectively. The second terminal of the third transistor T3 is grounded. The second terminal of the eighth resistor R8 is electrically connected to the first terminal of the ninth resistor R9 and the control terminal of the fourth transistor T4, respectively. The second terminal of the ninth resistor R9 is electrically connected to the first terminal of the fourth transistor T4, the first terminal of the tenth resistor R10, and the power supply terminal, respectively. The second terminal of the fourth transistor T4 is electrically connected to the second terminal of the tenth resistor R10 and the negative terminal of the third diode D3, respectively. The positive terminal of the third diode D3 is grounded.

[0055] See also Figure 1 and Figure 3 The signal output terminal of the control module 140 generates a solenoid valve control signal and inputs the solenoid valve control signal to the main valve drive circuit 111 corresponding to the solenoid valve control signal.

[0056] When the solenoid valve control signal is a high-level signal, the third transistor T3 is turned on, and the control terminal of the fourth transistor T4 is a low-level signal. At this time, the port connected to the positive terminal of the main valve 110 and the third diode D3 is the power supply voltage, and the power supply voltage signal is input to the detection circuit 130.

[0057] When the solenoid valve control signal is low, the third transistor T3 and the fourth transistor T4 are turned off. At this time, the voltage U at the port connected to the positive terminal of the third diode D3 of the main valve 110 is the voltage divider between the main valve 110 and the tenth resistor R10, which can be expressed by the formula... Therefore, it is understandable that as long as the resistance value of the tenth resistor R10 is within a reasonable range, the detection circuit 130 will not detect the input voltage signal.

[0058] Specifically, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all used for current limiting, thereby protecting the main valve drive circuit 111. The tenth resistor R10 is used to share the leakage current generated in the main valve drive circuit 111, so that the third diode D3 can be reliably kept in the off state, protecting the main valve 110 and improving the reliability of the main valve drive circuit 111.

[0059] For example, the resistance values ​​of the sixth resistor R6 and the seventh resistor R7 are 4.7K, the resistance value of the ninth resistor R9 can be in the range of 10K, the resistance value of the eighth resistor R8 is 7.5K-1206, and the resistance value of the tenth resistor is 56K.

[0060] The rectifier capacitor E1 is used to absorb the electrical energy output by the control module 140. When it is charged to a certain value, it feeds back DC to the control module 140, which then controls the conduction or cutoff of other switches in the main valve drive circuit 111. Optionally, the value range of the rectifier capacitor E1 is 47μF / 35V.

[0061] Referring again to 3, based on the above embodiment, the first end of the main valve 110 is electrically connected to the second end of the fourth transistor T4, the second end of the tenth resistor R10 and the negative terminal of the third diode D3, and the second end of the main valve 110 is electrically connected to the positive terminal of the third diode D3.

[0062] See also Figure 1 and Figure 3 The first end of the main valve 110 is electrically connected to the detection circuit 130. The second end of the fourth transistor T4, the second end of the tenth resistor R10, and the negative terminal of the third diode D3 are electrically connected to the detection circuit 130. The positive terminal of the third diode D3 is grounded.

[0063] Specifically, the first end of the main valve 110 outputs a feedback signal, which is then input to the detection circuit 130. The detection circuit 130 determines the solenoid valve detection signal based on the feedback signal, thereby determining whether the main valve 110 is in normal operating condition.

[0064] Figure 4 This is a schematic diagram of the detection circuit 130 provided in an embodiment of the present invention. See also... Figure 1 and Figure 4 Based on the above embodiments, the detection circuit 130 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fifth transistor T5, a main valve resistor Rz, and at least one segmented valve resistor Rf.

[0065] The first end of the main valve resistor Rz is electrically connected to the first end of the main valve 110. The second end of the main valve resistor Rz is electrically connected to the first end of the eleventh resistor R11 and the control end of the fifth transistor T5. The first end of the segmented valve resistor Rf is electrically connected to the first end of the segmented valve 120. The second end of the segmented valve resistor Rf is electrically connected to the first end of the eleventh resistor R11 and the control end of the fifth transistor T5. The second end of the eleventh resistor R11 is grounded. The first end of the fifth transistor T5 is electrically connected to the first end of the twelfth resistor R12 and the first end of the thirteenth resistor R13. The second end of the twelfth resistor R12 is electrically connected to the power supply terminal VCC. The second end of the thirteenth resistor R13 is electrically connected to the signal input terminal of the control module 140. The second end of the fifth transistor T5 is grounded.

[0066] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 When the first terminal of the main valve resistor Rz receives a feedback signal, if the feedback signal is the power supply voltage signal, the fifth transistor T5 is turned on, and the signal input terminal of the control module 140 receives a low-level signal. When the first terminal of the main valve resistor Rz receives a feedback signal, if the feedback signal is not the power supply voltage signal, the fifth transistor T5 is turned off, and the signal input terminal of the control module 140 receives a high-level signal.

[0067] When the first terminal of the segmented valve resistor Rf receives a feedback signal, if the feedback signal is a power supply voltage signal, the fifth transistor T5 is turned on, and the signal input terminal of the control module 140 receives a low-level signal. When the first terminal of the segmented valve resistor Rf receives a feedback signal, if the feedback signal is not a power supply voltage signal, the fifth transistor T5 is turned off, and the signal input terminal of the control module 140 receives a high-level signal.

[0068] Specifically, the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13 are all used for current limiting, thereby protecting the detection circuit 130. The main valve resistor Rz and the segmented valve resistor Rf are used for voltage division.

[0069] For example, the resistance values ​​of the main valve resistor Rz and the segment valve resistor Rf are 56K, the resistance values ​​of the eleventh resistor R11 and the twelfth resistor R12 can be 10K, and the resistance value of the thirteenth resistor R13 can be 1K.

[0070] Based on the above embodiments, the solenoid valve control signal is a high-level signal, the main valve drive circuit 111 or the segmented valve drive circuit 121 receives the high-level signal and outputs the feedback signal as a high-level signal, the fifth transistor T5 is turned on, and the detection circuit 130 outputs the solenoid valve detection signal as a low-level signal.

[0071] See also Figure 1 , Figure 2 and Figure 4 If the solenoid valve is a segmented valve 120, the control module 140 generates a high-level solenoid valve control signal. The segmented valve drive circuit 121 receives the high-level signal, the first transistor T1 in the segmented valve drive circuit 121 is turned on, the control terminal of the second transistor T3 is a low-level signal, the second transistor T2 is turned on, the segmented valve drive circuit 121 outputs the feedback signal as a high-level signal through the first terminal of the segmented valve 120, the detection circuit 130 receives the high-level signal through the first terminal of the segmented valve resistor Rf, the fifth transistor T5 is turned on, and the detection circuit 130 outputs a low-level solenoid valve detection signal.

[0072] See also Figure 1 , Figure 3 and Figure 4 If the solenoid valve is the main valve 110, the control module 140 generates a high-level solenoid valve control signal. The main valve drive circuit 111 receives the high-level signal, the third transistor T3 in the main valve drive circuit 110 is turned on, the control terminal of the fourth transistor T4 is a low-level signal, the fourth transistor T4 is turned on, the main valve drive circuit 111 outputs the feedback signal as a high-level signal through the first terminal of the main valve 110, the detection circuit 130 receives the high-level signal through the first terminal of the main valve resistor Rz, the fifth transistor T5 is turned on, and the detection circuit 130 outputs a low-level solenoid valve detection signal.

[0073] Based on the above embodiments, the solenoid valve control signal is a low-level signal, the main valve drive circuit 111 or the segmented valve drive circuit 121 receives the low-level signal and outputs the feedback signal as a low-level signal, the fifth transistor T5 is turned off, and the detection circuit 130 outputs the solenoid valve detection signal as a high-level signal.

[0074] See also Figure 1 , Figure 2 and Figure 4 If the solenoid valve is a segmented valve 120, the control module 140 generates a low-level solenoid valve control signal. The segmented valve drive circuit 121 receives the low-level signal, and the first transistor T1 and the second transistor T2 in the segmented valve drive circuit 121 are turned off. The segmented valve drive circuit 121 outputs the feedback signal through the first terminal of the segmented valve 120, which is obtained by formula... The obtained port voltage U between the segmented valve 120 and the positive terminal of the first diode D1 can be controlled by the detection circuit 130 to turn off the fifth transistor T5 by properly controlling the resistance value of the third resistor R3. The detection circuit 130 outputs a high-level signal for the solenoid valve detection.

[0075] See also Figure 1 , Figure 3 and Figure 4 If the solenoid valve is the main valve 110, the control module 140 generates a low-level solenoid valve control signal. The main valve drive circuit 111 receives the low-level signal, and the third transistor T3 and the fourth transistor T4 in the main valve drive circuit 111 are turned off. The main valve drive circuit 111 outputs the feedback signal through the first terminal of the main valve 110, which is obtained by formula... The obtained port voltage U between the main valve 110 and the positive terminal of the third diode D3 can be controlled by the detection circuit 130 to turn off the fifth transistor T5 by properly controlling the resistance value of the tenth resistor R10. The detection circuit 130 outputs a low-level signal for the solenoid valve detection.

[0076] Figure 5 This is a schematic diagram of a solenoid valve control circuit provided in an embodiment of the present invention. (Continue reading...) Figure 1 and Figure 5 A main valve drive circuit 111 and the main valve 110 are electrically connected to the detection circuit 130 via a main valve resistor. Multiple segmented valve drive circuits 121 are electrically connected to segmented valves 120 respectively, and are further electrically connected to the detection circuit 130 via segmented valve resistors. This embodiment controls the main valve 110 or segmented valves 120 in a specific time sequence to detect various abnormal conditions of the main valve 110 and segmented valves 120. When a main valve 110 or segmented valve 120 is normally opened, closed, or experiences an abnormal fault, the detection circuit 130 promptly feeds back the information to the control module 140 to ensure the normal operation of the gas water heater.

[0077] Additionally, it should be noted that if the coil of the solenoid valve (i.e., the main valve or the solenoid valve) burns out and is open-circuited, it can be understood that the main valve or the solenoid valve is not connected to the load, which also falls under this situation. In this case, the resistance of the corresponding solenoid valve is infinite. At this time, the voltage U of the main valve or the sectional valve is not affected by the solenoid valve control signal and remains at the voltage VCC at the power supply terminal. Then, the fifth transistor in the detection circuit is turned on, and the output solenoid valve detection signal of the detection circuit is a low-level signal.

[0078] The technical solution of this invention, based on the load characteristics of the solenoid valve, integrates and superimposes the feedback signals of the solenoid valve to optimize the control method. It uses independent pulse signals to detect each solenoid valve, meaning that each output signal independently controls the main valve and each segment valve, thereby accurately locating solenoid valve faults. Its implementation circuit is simple and highly practical, and can detect the solenoid valve control circuit and its normal operation in real time. Furthermore, the solenoid valve detection circuit of this embodiment is highly versatile. Even if the number of burners and segment valves in the gas water heater increases, only one detection port resource is needed, and it can provide real-time feedback on the operating status of the solenoid valve, improving the stability and safety of the solenoid valve system.

[0079] This invention also provides a circuit board that includes the solenoid valve detection circuit described in the above embodiments of this invention.

[0080] The technical solution of this invention includes a solenoid valve detection circuit comprising a main valve, a main valve drive circuit electrically connected to the main valve, at least one segmented valve, at least one segmented valve drive circuit electrically connected to the segmented valve, a detection circuit, and a control module. The control module is communicatively connected to both the main valve drive circuit and the segmented valve drive circuit. The control module generates a solenoid valve control signal and inputs the solenoid valve control signal to the corresponding main valve drive circuit or segmented valve drive circuit to control the main valve drive circuit or segmented valve drive circuit to energize the corresponding main valve or segmented valve, and generates a feedback signal for the main valve or segmented valve. The detection circuit is communicatively connected to both the main valve and at least one segmented valve, and electrically connected to the control module. The detection circuit converts the feedback signal into a solenoid valve detection signal and feeds the solenoid valve detection signal back to the control module to control the control module to determine whether the main valve or segmented valve is in normal operating condition based on the solenoid valve detection signal. This solution addresses the problems of existing solutions that require individual testing of each solenoid valve in a gas water heater, which involves complex circuitry, high costs, and significant resource consumption by the controller's microcontroller, resulting in poor portability. The goal is to achieve real-time and accurate detection of solenoid valve faults, ensuring the normal operation of the gas water heater.

[0081] This invention also provides a gas water heater, which includes the circuit board described in the above embodiments of this invention, and the circuit board includes the solenoid valve detection circuit described in the above embodiments of this invention.

[0082] The technical solution of this invention includes a solenoid valve detection circuit comprising a main valve, a main valve drive circuit electrically connected to the main valve, at least one segmented valve, at least one segmented valve drive circuit electrically connected to the segmented valve, a detection circuit, and a control module. The control module is communicatively connected to both the main valve drive circuit and the segmented valve drive circuit. The control module generates a solenoid valve control signal and inputs the solenoid valve control signal to the corresponding main valve drive circuit or segmented valve drive circuit to control the main valve drive circuit or segmented valve drive circuit to energize the corresponding main valve or segmented valve, and generates a feedback signal for the main valve or segmented valve. The detection circuit is communicatively connected to both the main valve and at least one segmented valve, and electrically connected to the control module. The detection circuit converts the feedback signal into a solenoid valve detection signal and feeds the solenoid valve detection signal back to the control module to control the control module to determine whether the main valve or segmented valve is in normal operating condition based on the solenoid valve detection signal. This solution addresses the problems of existing solutions that require individual testing of each solenoid valve in a gas water heater, which involves complex circuitry, high costs, and significant resource consumption by the controller's microcontroller, resulting in poor portability. The goal is to achieve real-time and accurate detection of solenoid valve faults, ensuring the normal operation of the gas water heater.

[0083] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A solenoid valve detection circuit, characterized in that, include: The system includes a main valve, a main valve drive circuit electrically connected to the main valve, at least one sectional valve, at least one sectional valve drive circuit electrically connected to the sectional valve, a detection circuit, and a control module. The control module is communicatively connected to the main valve drive circuit and the segmented valve drive circuit, respectively. The control module is used to generate a solenoid valve control signal and input the solenoid valve control signal to the main valve drive circuit or the segmented valve drive circuit corresponding to the solenoid valve control signal, so as to control the main valve drive circuit or the segmented valve drive circuit to drive the corresponding main valve or the segmented valve to be energized, and generate a feedback signal of the main valve or the segmented valve. The detection circuit is communicatively connected to the main valve and at least one of the segmented valves, and electrically connected to the control module. The detection circuit is used to convert the feedback signal into a solenoid valve detection signal and feed the solenoid valve detection signal back to the control module so as to control the control module to determine whether the main valve or the segmented valve is in normal operating condition based on the solenoid valve detection signal. The control module is also used to output microsecond-level pulse signals in real time. These microsecond-level pulse signals will not cause the main valve and the segmented valve to operate. At the same time, the detection circuit is used to check whether there is a solenoid valve detection signal output, so as to determine whether the main valve drive circuit and the segmented valve drive circuit corresponding to the main valve and the segmented valve are normal.

2. The solenoid valve detection circuit according to claim 1, characterized in that, The segmented valve drive circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, and a first diode; The signal output terminal of the control module is electrically connected to the first terminal of the first resistor. The second terminal of the first resistor is electrically connected to the control terminal of the first transistor and the first terminal of the second resistor. The first terminal of the first transistor is electrically connected to the first terminal of the third resistor. The second terminal of the second resistor and the second terminal of the first transistor are grounded. The second terminal of the third resistor is electrically connected to the first terminal of the fourth resistor and the control terminal of the second transistor. The second terminal of the fourth resistor is electrically connected to the first terminal of the second transistor, the first terminal of the fifth resistor, and the power supply terminal. The second terminal of the second transistor is electrically connected to the second terminal of the fifth resistor and the negative terminal of the first diode. The positive terminal of the first diode is grounded.

3. The solenoid valve detection circuit according to claim 2, characterized in that, The first end of the segmented valve is electrically connected to the second end of the second transistor, the second end of the fifth resistor, and the negative terminal of the first diode, respectively, and the second end of the segmented valve is electrically connected to the positive terminal of the first diode.

4. The solenoid valve detection circuit according to claim 1, characterized in that, The main valve drive circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a rectifier capacitor, a second diode, a third diode, a third transistor, and a fourth transistor. The signal output terminal of the control module is electrically connected to the first terminal of the sixth resistor and the positive terminal of the rectifier capacitor, respectively. The second terminal of the sixth resistor is grounded. The negative terminal of the rectifier capacitor is electrically connected to the first terminal of the seventh resistor. The second terminal of the seventh resistor is electrically connected to the negative terminal of the second diode and the control terminal of the third transistor, respectively. The positive terminal of the second diode is grounded. The first terminal of the third transistor is electrically connected to the first terminal of the eighth resistor, respectively. The second terminal of the third transistor is grounded. The second terminal of the eighth resistor is electrically connected to the first terminal of the ninth resistor and the control terminal of the fourth transistor, respectively. The second terminal of the ninth resistor is electrically connected to the first terminal of the fourth transistor, the first terminal of the tenth resistor, and the power supply terminal, respectively. The second terminal of the fourth transistor is electrically connected to the second terminal of the tenth resistor and the negative terminal of the third diode, respectively. The positive terminal of the third diode is grounded.

5. The solenoid valve detection circuit according to claim 4, characterized in that, The first end of the main valve is electrically connected to the second end of the fourth transistor, the second end of the tenth resistor, and the negative terminal of the third diode, respectively, and the second end of the main valve is electrically connected to the positive terminal of the third diode.

6. The solenoid valve detection circuit according to claim 1, characterized in that, The detection circuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth transistor, a main valve resistor, and at least one segmented valve resistor; The first end of the main valve resistor is electrically connected to the first end of the main valve. The second end of the main valve resistor is electrically connected to the first end of the eleventh resistor and the control end of the fifth transistor. The first end of the segmented valve resistor is electrically connected to the first end of the segmented valve. The second end of the segmented valve resistor is electrically connected to the first end of the eleventh resistor and the control end of the fifth transistor. The second end of the eleventh resistor is grounded. The first end of the fifth transistor is electrically connected to the first end of the twelfth resistor and the first end of the thirteenth resistor. The second end of the twelfth resistor is electrically connected to the power supply terminal. The second end of the thirteenth resistor is electrically connected to the signal input terminal of the control module. The second end of the fifth transistor is grounded.

7. The solenoid valve detection circuit according to claim 6, characterized in that, The solenoid valve control signal is a high-level signal. The main valve drive circuit or the segmented valve drive circuit receives the high-level signal and outputs a high-level feedback signal. The fifth transistor is turned on, and the detection circuit outputs a low-level solenoid valve detection signal.

8. The solenoid valve detection circuit according to claim 6, characterized in that, The solenoid valve control signal is a low-level signal. The main valve drive circuit or the segmented valve drive circuit receives the low-level signal and outputs a low-level feedback signal. The fifth transistor is turned off, and the detection circuit outputs a high-level solenoid valve detection signal.

9. A circuit board, characterized in that, Includes the solenoid valve detection circuit as described in any one of claims 1-8.

10. A gas-fired water heater, characterized in that, Includes the circuit board as described in claim 9.

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