Electromagnetic valve control circuit, gas stove valve control system and gas stove

Abstract

The invention relates to an electromagnetic valve control circuit, a gas stove valve control system and a gas stove, and the electromagnetic valve control circuit comprises an electric energy input circuit, a voltage transmission inductor, a voltage conditioning circuit and a driving conditioning circuit, the voltage conditioning circuit is connected with the second end of the primary winding of the voltage transmission inductor, and the driving conditioning circuit is connected with the electromagnetic valve and the two ends of the secondary winding of the voltage transmission inductor. The driving voltage of the voltage transmission inductor is determined based on the input voltage, the working state of the electric energy input circuit and the working state of the voltage conditioning circuit, the voltage transmission inductor generates control voltage based on driving voltage isolation, and the driving conditioning circuit controls the electromagnetic valve based on the control voltage. Isolation of driving voltage and control voltage is achieved through voltage transmission inductance, electrical impact can be effectively prevented, and the safety performance of the control process of the electromagnetic valve is improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas equipment, and particularly to a solenoid valve control circuit, a gas stove valve control system, and a gas stove. Background Art

[0002] In the design of gas stoves, valves that can maintain a closed or open state are usually designed, such as gas emergency cut-off valves. As a safety emergency cut-off device for gas pipelines, the solenoid valve can be connected to a gas leakage alarm system, a gas monitoring device, and other detection terminals. It remains in a conducting state during daily use and can cut off the gas when receiving a certain signal to ensure gas use safety.

[0003] The valve that controls the opening and closing of the gas flow path is also called a pilot valve, and generally a solenoid valve is selected. It switches between the valve opening state and the valve closing state during use. For the control of the solenoid valve of a gas stove, different circuits are usually configured for the solenoid valve. When the corresponding circuit is enabled, the solenoid valve obtains different voltages to achieve different state switches.

[0004] However, with the update and iteration of gas stoves, people's demand for the use safety of gas stoves has been further improved, and the control of solenoid valves also needs to be further optimized. The previous method of applying voltage to the solenoid valve through a circuit has certain safety hazards, and a safer and more reliable switching power supply is urgently needed to control the solenoid valve. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a solenoid valve control circuit, a gas stove valve control system, and a gas stove that can improve the safety of solenoid valve control.

[0006] In a first aspect, the present application provides a solenoid valve control circuit. The solenoid valve control circuit includes a power input circuit, a voltage transfer inductor, a voltage conditioning circuit, and a drive conditioning circuit. The power input circuit is connected to the input voltage and the first end of the primary winding of the voltage transfer inductor. The voltage conditioning circuit is connected to the second end of the primary winding of the voltage transfer inductor. The drive conditioning circuit is connected to the solenoid valve and both ends of the secondary winding of the voltage transfer inductor;

[0007] The drive voltage of the voltage transfer inductor is determined based on the input voltage, the working state of the power input circuit, and the working state of the voltage conditioning circuit. The voltage transfer inductor generates a control voltage through isolation based on the drive voltage, and the drive conditioning circuit controls the solenoid valve based on the control voltage.

[0008] In one of the embodiments, the voltage transfer inductor is a common mode inductor.

[0009] In one embodiment, the power input circuit includes a power switch tube. The output end of the power switch tube is connected to the pressure transfer inductor, the input end of the power switch tube is connected to the input voltage, and the control end of the power switch tube is connected to the first signal input end. The first signal input end is used to output a first signal to the control end of the power switch tube to control the working state of the power switch tube.

[0010] In one embodiment, the power input circuit further includes a current limiting resistor, which is arranged between the first signal input end and the control end of the power switch tube.

[0011] In one embodiment, the power input circuit further includes a freewheeling diode. The cathode of the freewheeling diode is connected to the output end of the power switch tube and the first end of the primary winding of the pressure transfer inductor, and the anode of the freewheeling diode is grounded.

[0012] In one embodiment, the voltage conditioning circuit includes a conditioning switch tube and a conditioning capacitor. The input end of the conditioning switch tube and the first end of the conditioning capacitor are both connected to the second end of the primary winding of the pressure transfer inductor. The output end of the conditioning switch tube and the second end of the conditioning capacitor are both grounded. The control end of the conditioning switch tube is connected to the second signal input end, and the second signal input end is used to output a second signal to the control end of the conditioning switch tube to control the working state of the conditioning switch tube.

[0013] In one embodiment, the conditioning capacitor is a polarized electrolytic capacitor. The positive electrode of the electrolytic capacitor is connected to the second end of the primary winding of the pressure transfer inductor, and the negative electrode of the electrolytic capacitor is grounded.

[0014] In one embodiment, the drive conditioning circuit includes a rectifier diode and a storage capacitor. The cathode of the rectifier diode is connected to the positive electrode of the storage capacitor and the solenoid valve. The anode of the rectifier diode is connected to the first end of the secondary winding of the pressure transfer inductor. The negative electrode of the storage capacitor is connected to the solenoid valve and the second end of the secondary winding of the pressure transfer inductor.

[0015] In one embodiment, the solenoid valve control circuit further includes a loop diode. The anode of the loop diode is connected to the solenoid valve and the secondary winding of the pressure transfer inductor, and the cathode of the loop diode is connected to the voltage conditioning circuit and the second end of the primary winding of the pressure transfer inductor.

[0016] In a second aspect, the present application also provides a gas stove valve control system, which includes an electromagnetic valve and the electromagnetic valve control circuit described in the above embodiments. The electromagnetic valve is arranged on the gas pipeline, the electromagnetic valve control circuit is connected to the electromagnetic valve, and the electromagnetic valve is connected to the positive pole of the battery of the gas stove.

[0017] In one embodiment, one end of the electromagnetic valve away from the electromagnetic valve control circuit is connected to a thermocouple.

[0018] In a third aspect, the present application also provides a gas stove, which includes the gas stove valve control system described in the above embodiments.

[0019] The above-mentioned electromagnetic valve control circuit, gas stove valve control system and gas stove include a power input circuit, a pressure transfer inductor, a voltage conditioning circuit and a drive conditioning circuit. The power input circuit is connected to the input voltage and the first end of the primary winding of the pressure transfer inductor. The voltage conditioning circuit is connected to the second end of the primary winding of the pressure transfer inductor. The drive conditioning circuit is connected to both ends of the secondary winding of the electromagnetic valve and the pressure transfer inductor. The drive voltage of the pressure transfer inductor is determined based on the input voltage, the working state of the power input circuit and the working state of the voltage conditioning circuit. The pressure transfer inductor generates a control voltage based on the drive voltage through isolation. The drive conditioning circuit controls the electromagnetic valve based on the control voltage. Based on the combination of the working state of the power input circuit and the working state of the voltage conditioning circuit, and combined with the input voltage, the drive voltage of the pressure transfer inductor is comprehensively determined. Then, the control voltage is generated through isolation by the pressure transfer inductor, so that the drive conditioning circuit can control the electromagnetic valve based on different control voltages. Through the pressure transfer inductor, the isolation between the drive voltage and the control voltage is realized, which can effectively prevent electrical shock, and can also reduce the fault damage through isolation in case of a fault, improving the safety performance of the electromagnetic valve control process. Description of the Drawings

[0020] Figure 1 It is an application environment diagram of the gas stove valve control system in one embodiment;

[0021] Figure 2 It is a schematic structural diagram of the gas stove valve control system in one embodiment;

[0022] Figure 3 It is a schematic structural diagram of the electromagnetic valve control circuit in one embodiment;

[0023] Figure 4 It is a schematic structural diagram of the electromagnetic valve control circuit in another embodiment;

[0024] Figure 5 It is a circuit schematic diagram of the electromagnetic valve control circuit in one embodiment.

[0025] Description of the reference numerals: solenoid valve control circuit 100, solenoid valve 300, power input circuit 110, pressure transmission inductor 130, voltage conditioning circuit 150, drive conditioning circuit 170; solenoid valve coil L2, thermocouple R2, loop diode D2, power switch tube Q1, current limiting resistor R1, freewheeling diode D1, conditioning switch tube Q2, conditioning capacitor C1, rectifier diode D3, energy storage capacitor C2, buck-boost inductor L1. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of the present application, a first resistor can be referred to as a second resistor, and similarly, a second resistor can be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0028] It can be understood that in the following embodiments, "connection", if there is an electrical signal or data transmission between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0029] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / include" or "has" etc. specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] The solenoid valve control circuit provided by the embodiments of the present application can be applied to, for example Figure 1In the application environment shown. Among them, the gas stove includes a gas stove valve control system, and the gas stove valve control system includes a solenoid valve 300 and the solenoid valve control circuit 100 described in each embodiment of the present application. The solenoid valve 300 is arranged on the gas pipeline and is used to control the on-off of the gas flow path. When the solenoid valve 300 is closed, the gas flow path in the gas pipeline is disconnected. When the solenoid valve 300 is turned on, the gas flow path in the gas pipeline is turned on.

[0032] The solenoid valve control circuit 100 is connected to the solenoid valve 300 to control the closing and turning on of the solenoid valve 300, so that the solenoid valve 300 switches between off and on, thereby controlling whether the gas flow path is turned on. The solenoid valve 300 is connected to the positive pole of the battery of the gas stove. Optionally, the solenoid valve 300 can be connected to the positive pole of the battery through the housing of the whole machine. This enables the solenoid valve 300 itself to maintain a certain voltage. In this way, when the solenoid valve control circuit 100 outputs different voltages to the solenoid valve 300, the solenoid valve 300 can compare the voltage supplied by the battery with the voltage given by the solenoid valve control circuit 100 and perform corresponding off or on state switching based on the comparison result.

[0033] Further, in one embodiment, one end of the solenoid valve away from the solenoid valve control circuit is connected to a thermocouple. The thermocouple is a temperature sensor and can be used to detect the temperature of the gas stove flame. When the flame burns normally, the thermocouple is heated and generates an electromotive force, which can be used to maintain the open state of the solenoid valve. Once the flame of the gas stove goes out, the temperature of the thermocouple drops rapidly, and the electromotive force also decreases accordingly, causing the solenoid valve to close, thereby cutting off the gas supply and preventing gas leakage. In this embodiment, the thermocouple can assist in turning on and off the solenoid valve at one end away from the solenoid valve control circuit, improving the safety of the solenoid valve when used in the gas stove.

[0034] Exemplarily, the solenoid valve in the gas stove valve control system can be as Figure 2 shown. The solenoid valve can be understood as two relatively arranged coil structures (marked as L2). The common point of the two pairs of solenoid valve coils is connected to the positive pole of the battery of the gas stove, and the battery positive pole provides the voltage of the solenoid valve itself, such as 3V. Among the other two ends of the two pairs of coils, the end of the first coil is connected to the solenoid valve control circuit and is driven by the solenoid valve control circuit; the end of the second coil is connected to the thermocouple R2 and is driven by the thermocouple R2.

[0035] When the solenoid valve is in the closed state, it can be considered that the solenoid valve is in the high-pressure impact valve or high-pressure valve closing state. At this time, the solenoid valve control circuit outputs a relatively high voltage to the solenoid valve to make the solenoid valve perform the valve closing action. When the solenoid valve is in the open and conducting state, it can be considered that the solenoid valve is in the low-pressure valve maintaining state. At this time, the solenoid valve control circuit outputs a relatively low voltage to the solenoid valve to make the solenoid valve maintain the conducting valve maintaining action. The relatively low and relatively high here are obtained by comparing with the battery voltage connected to the solenoid valve. In this way, when the solenoid valve control circuit outputs a voltage, by comparing the voltages applied to the solenoid valve by the solenoid valve control circuit and the battery, the on-off state of the solenoid valve can be changed.

[0036] In one embodiment, as Figure 3 shown, a solenoid valve control circuit is provided, including a power input circuit 110, a pressure transfer inductor 130, a voltage conditioning circuit 150, and a drive conditioning circuit 170. The power input circuit 110 is connected to the input voltage and the first end of the primary winding of the pressure transfer inductor 130. The voltage conditioning circuit 150 is connected to the second end of the primary winding of the pressure transfer inductor 130. The drive conditioning circuit 170 is connected to both ends of the secondary winding of the solenoid valve and the pressure transfer inductor 130.

[0037] The drive voltage of the pressure transfer inductor 130 is determined based on the input voltage, the operating state of the power input circuit 110, and the operating state of the voltage conditioning circuit 150. The pressure transfer inductor 130 generates a control voltage based on the drive voltage through isolation. The drive conditioning circuit 170 controls the solenoid valve based on the control voltage.

[0038] Specifically, the power input circuit 110 is connected to the input voltage. At the same time, the power input circuit 110 is also connected to the first signal input terminal to access the first signal. Driven by the first signal, the power input circuit 110 is in different operating states correspondingly, and then different processing is performed on the input voltage. The voltage conditioning circuit 150 is grounded. At the same time, the voltage conditioning circuit 150 is also connected to the second signal input terminal to access the second signal. Driven by the second signal, the voltage conditioning circuit 150 is in different operating states correspondingly, and then it cooperates with the operating state of the power input circuit 110 to adjust the electric energy transmitted from the input voltage to the primary winding of the pressure transfer inductor 130, that is, the drive voltage.

[0039] One end of the primary winding of the pressure transmission inductor 130 is connected to the power input circuit 110, and the other end of the primary winding of the pressure transmission inductor 130 is connected to the voltage conditioning circuit 150. Therefore, the pressure transmission inductor 130, the power input circuit 110, and the voltage conditioning circuit 150 can form a loop. With the adjustment and change of the first signal and the second signal, the working states of the power input circuit 110 and the voltage conditioning circuit 150 are further adjusted, resulting in a change in the loop structure formed, a change in the voltage applied to the primary winding of the pressure transmission inductor 130, and further a change in the control voltage generated by the pressure transmission inductor 130 in its secondary winding. Since the primary winding and the secondary winding of the pressure transmission inductor 130 are not electrically connected, that is, electrical isolation is formed between the driving voltage and the control voltage.

[0040] Exemplarily, in an optional embodiment, the pressure transmission inductor 130 can be a common mode inductor. The primary winding and the secondary winding of the common mode inductor can be coils respectively. For example, two coils with the same size and the same number of turns are symmetrically wound on the same ferrite toroidal core. Optionally, the pressure transmission inductor 130 is a 200uH common mode inductor.

[0041] The drive conditioning circuit 170 is connected to the secondary winding of the sensing voltage, can access and condition the control voltage, and transmit the conditioned control voltage to the solenoid valve to control the opening and closing of the solenoid valve.

[0042] Further, as Figure 4 shown, the solenoid valve control circuit can further include a loop diode D2. The anode of the loop diode D2 is connected to the solenoid valve and the secondary winding of the pressure transmission inductor 130, and the cathode of the loop diode D2 is connected to the voltage conditioning circuit 150 and the other end of the primary winding of the pressure transmission inductor 130.

[0043] Specifically, the anode of the loop diode D2 is connected to the solenoid valve and the secondary winding of the pressure transmission inductor 130, which can transfer the redundant electrical energy in the control voltage generated on the secondary winding of the pressure transmission inductor 130 that is not used by the drive conditioning circuit 170 to the voltage conditioning circuit 150 and the other end of the primary winding of the pressure transmission inductor 130, establishing a unidirectional conduction loop to dissipate the redundant electrical energy to prevent the electrical energy from accumulating in the drive conditioning circuit 170 and affecting the control of the solenoid valve.

[0044] Optionally, the loop diode D2 can be a Schottky diode. The Schottky diode, also known as SBD (Schottky Barrier Diode) or hot carrier diode, is a semiconductor diode with special electrical characteristics. It has a lower forward voltage drop, a fast switching response speed, can withstand a large reverse voltage, and has higher efficiency.

[0045] In this embodiment, the solenoid valve control circuit includes a power input circuit 110, a pressure transfer inductor 130, a voltage conditioning circuit 150, and a drive conditioning circuit 170. The power input circuit 110 is connected to the input voltage and the first end of the primary winding of the pressure transfer inductor 130. The voltage conditioning circuit 150 is connected to the second end of the primary winding of the pressure transfer inductor 130. The drive conditioning circuit 170 is connected to both ends of the secondary winding of the solenoid valve and the pressure transfer inductor 130. The drive voltage of the pressure transfer inductor 130 is determined based on the input voltage, the operating state of the power input circuit 110, and the operating state of the voltage conditioning circuit 150. The pressure transfer inductor 130 generates a control voltage through isolation based on the drive voltage. The drive conditioning circuit 170 controls the solenoid valve based on the control voltage. Based on the combination of the operating state of the power input circuit 110 and the operating state of the voltage conditioning circuit 150, and combined with the input voltage, the drive voltage of the pressure transfer inductor 130 is comprehensively determined. Then, the control voltage is generated through isolation by the pressure transfer inductor, enabling the drive conditioning circuit 170 to control the solenoid valve based on different control voltages. Through the pressure transfer inductor 130, isolation between the drive voltage and the control voltage is achieved, which can effectively prevent electrical shocks. In the event of a failure, the fault damage can also be reduced through isolation, improving the safety performance of the solenoid valve control process. At the same time, in this embodiment, based on the common coordination of the power input circuit 110 and the voltage conditioning circuit 150, the magnitude of the drive voltage obtained on the primary winding of the pressure transfer inductor 130 is changed, enabling flexible voltage regulation. Different state controls of the solenoid valve are achieved based on one circuit without connecting multiple circuits to the solenoid valve, making the control more convenient.

[0046] For a clearer explanation of this application, Figure 5 is taken as an example for illustration. In an exemplary embodiment, as Figure 5 shown, the power input circuit 110 includes a power switch tube Q1. The input end of the power switch tube Q1 is connected to the pressure transfer inductor 130. The output end of the power switch tube Q1 is connected to the input voltage. The control end of the power switch tube Q1 is connected to the first signal input end. The first signal input end is used to output a first signal to the control end of the power switch tube Q1 to control the operating state of the power switch tube Q1.

[0047] Specifically, the control end of the power switch tube Q1 is connected to the first signal input end. The first signal input end transmits a first signal, which switches the opening or closing of the power switch tube Q1 through the first signal, thereby controlling whether the input voltage can be transmitted from the output end of the power switch tube Q1 to the input end of the power switch tube Q1, which is equivalent to controlling the operating state of the power input circuit 110.

[0048] Further, the first signal may be a PWM (Pulse Width Modulation) signal or different level signals. Optionally, the PWM signal is a digital signal that controls the average value by changing the pulse width. By adjusting the duty cycle of the PWM signal (the ratio of the pulse width to the period), equivalent control of the analog signal level can be achieved. The level signal can be a high-level signal or a low-level signal.

[0049] Exemplarily, when the power switch tube Q1 is a PNP triode, the first signal may be PWM signals with different duty cycles or a low-level signal. When the first signal is a PWM signal, the power switch tube Q1 conducts and turns off with the PWM signal, and the voltage output to the primary winding of the pressure transfer inductor 130 is lower than the input voltage; when the first signal is a low-level signal, the power switch tube Q1 is normally open, and the voltage output to the primary winding of the pressure transfer inductor 130 is almost equal to the input voltage. Among them, the PNP triode is a bipolar transistor composed of two P-type semiconductors sandwiching an N-type semiconductor.

[0050] Further, in an exemplary embodiment, as Figure 5 shown, the power input circuit 110 further includes a current-limiting resistor R1, and the current-limiting resistor R1 is arranged between the first signal input end and the control end of the power switch tube Q1.

[0051] The current-limiting resistor R1 is serially arranged between the first signal input end and the control end of the power switch tube Q1 to limit the magnitude of the current in the branch to prevent components connected in series from being burned out due to excessive current. The current-limiting resistor R1 increases the total resistance of the load by being connected in series in the circuit, thereby reducing the magnitude of the current; when the current is too large, the current-limiting resistor R1 can limit the flow of the current to prevent components from being damaged due to overheating. Optionally, the current-limiting resistor R1 can be a 1K ohm resistor.

[0052] Meanwhile, further, in an exemplary embodiment, as Figure 5 shown, the power input circuit 110 further includes a freewheeling diode D1. The cathode of the freewheeling diode D1 is connected to the input end of the power switch tube Q1 and the first end of the primary winding of the pressure transfer inductor 130, and the anode of the freewheeling diode D1 is grounded.

[0053] Among them, the structure of the freewheeling diode D1 is similar to that of an ordinary diode, mainly composed of a P-type semiconductor and an N-type semiconductor connected through a PN junction. However, its special design enables it to withstand reverse high voltage and provide a low-impedance path, enabling the current to change more smoothly. It can be applied when the current of an inductive load suddenly changes, consuming the back electromotive force to protect the components in the circuit. Optionally, the freewheeling diode D1 can be a Schottky diode.

[0054] Specifically, the freewheeling diode D1 is disposed between the output end of the power switch tube Q1 and the first end of the primary winding of the pressure transfer inductor 130. The anode of the freewheeling diode D1 is grounded, and the cathode of the freewheeling diode D1 is connected to the output end of the power switch tube Q1 and the first end of the primary winding of the pressure transfer inductor 130, and is used to consume in the form of current when the pressure transfer inductor 130 generates a back electromotive force, reduce the change amplitude of the current, and maintain the stability of the circuit.

[0055] In this embodiment, by disposing the freewheeling diode D1 between the output end of the power switch tube Q1 and the first end of the primary winding of the pressure transfer inductor 130, it is beneficial to protect the circuit stability, reduce current fluctuations, and protect the safe operation of the circuit.

[0056] In an exemplary embodiment, as Figure 5 shown, the voltage conditioning circuit 150 includes a conditioning switch tube Q2 and a conditioning capacitor C1. The input end of the conditioning switch tube Q2 and the first end of the conditioning capacitor C1 are both connected to the second end of the primary winding of the pressure transfer inductor 130. The output end of the conditioning switch tube Q2 and the second end of the conditioning capacitor C1 are both grounded. The control end of the conditioning switch tube Q2 is connected to the second signal input end, and the second signal input end is used to output a second signal to the control end of the conditioning switch tube Q2 to control the working state of the conditioning switch tube Q2.

[0057] Specifically, the conditioning switch tube Q2 and the conditioning capacitor C1 are connected in parallel, that is, the input end of the conditioning switch tube Q2 is connected to the first end of the conditioning capacitor C1, and the output end of the conditioning switch tube Q2 and the second end of the conditioning capacitor C1 are both grounded. And the control end of the conditioning switch tube Q2 is connected to the second signal input end, and can correspondingly adjust the switching state of the conditioning switch tube Q2 under the control of the second signal, thereby changing the working state of the voltage conditioning circuit 150.

[0058] The ungrounded end after the conditioning switch tube Q2 and the conditioning capacitor C1 are connected in parallel is connected to the second end of the primary winding of the pressure transfer inductor 130, which is equivalent to connecting to the power input circuit 110 through the primary winding of the pressure transfer inductor 130, and can obtain the voltage output by the power input circuit 110 from the primary winding of the pressure transfer inductor 130. When the voltage conditioning circuit 150 is in different working states, it can transfer or discharge the voltage output by the power input circuit 110 to different degrees, cooperate with the power input circuit 110, and adjust the driving voltage on the primary winding of the pressure transfer inductor 130, so that the driving voltage obtained by the pressure transfer inductor 130 is different, and thus the control voltage generated by its secondary winding also changes accordingly.

[0059] Further, the second signal may be a PWM signal or different level signals. Optionally, the PWM signal is a digital signal that controls the average value by changing the pulse width. By adjusting the duty cycle of the PWM signal (the ratio of the pulse width to the period), equivalent control of the analog signal level can be achieved. The level signal can be a high-level signal or a low-level signal.

[0060] Optionally, when the conditioning switch Q2 is turned off under the control of the second signal, the voltage of the primary winding of the pressure transfer inductor 130 is applied to the conditioning capacitor C1. Since the capacitance of the capacitor is low, the voltage of the primary winding of the pressure transfer inductor 130 is also low at this time, and the control voltage generated by the isolation of the pressure transfer inductor 130 is also low, and the solenoid valve is driven with a lower voltage. If the power input circuit 110 includes a power switch Q1 and a freewheeling diode D1, the first signal should drive the power switch Q1 with a PWM signal. Utilizing the circuit characteristics of the conditioning capacitor C1, a buck circuit is formed by the power switch Q1, the freewheeling diode D1, the pressure transfer inductor 130, and the conditioning capacitor C1, and a lower driving voltage is formed on the primary winding of the pressure transfer inductor 130, and a corresponding control voltage is formed on the secondary winding of the pressure transfer inductor 130 in an electrically isolated manner.

[0061] When the conditioning switch Q2 is turned on under the control of the second signal, the voltage of the primary winding of the pressure transfer inductor 130 is grounded through the conditioning switch Q2. At this time, if the power input circuit 110 includes a power switch Q1 and a freewheeling diode D1, the first signal should drive the power switch Q1 with a low-level signal to make the input voltage constantly output to the primary winding of the pressure transfer inductor 130. At the same time, the second signal should drive the conditioning switch Q2 with a PWM signal. By using the on-off switching of the conditioning switch Q2, it is controlled whether the loop formed by the pressure transfer inductor 130, the power input circuit 110, and the voltage conditioning circuit 150 is grounded. When the conditioning switch Q2 is turned on, the conditioning switch Q2 and the pressure transfer inductor 130 form a boost circuit, so that a higher voltage is formed on the primary winding of the pressure transfer inductor 130. Among them, the aforementioned lower or higher is compared with the voltage of the battery positive electrode connected to the solenoid valve.

[0062] Exemplarily, when the conditioning switch tube Q2 is an NPN triode, the second signal may be a PWM signal with different duty cycles or a low-level signal. When the second signal is a PWM signal, the conditioning switch tube Q2 conducts and turns off with the PWM signal to control whether the loop formed by the pressure transfer inductor 130, the power input circuit 110, and the voltage conditioning circuit 150 is grounded; when the second signal is a low-level signal, the conditioning switch tube Q2 is normally closed, and the voltage of the primary winding of the pressure transfer inductor 130 is output to the conditioning capacitor C1. The conditioning capacitor C1 stores a small amount of electrical energy, making the voltage of the primary winding of the pressure transfer inductor 130 relatively low. Among them, a PNP triode is composed of two N-type semiconductor blocks sandwiching a P-type semiconductor block.

[0063] Exemplarily, in one embodiment, the conditioning capacitor C1 is a polarized electrolytic capacitor. The positive electrode of the electrolytic capacitor is connected to the second end of the primary winding of the pressure transfer inductor 130, and the negative electrode of the electrolytic capacitor is grounded.

[0064] Among them, the electrolytic capacitor uses a metal foil as the positive electrode (aluminum or tantalum), the metal oxide film (aluminum oxide or tantalum pentoxide) in close contact with the positive electrode as the dielectric, and the cathode is composed of a conductive material, an electrolyte (which can be liquid or solid), and other materials. Since the electrolyte is the main part of the cathode, the electrolytic capacitor gets its name. It uses the dielectric effect of the dielectric (such as electrolyte) to store charge. Optionally, the conditioning capacitor C1 can be a 100uF electrolytic capacitor.

[0065] When a voltage is applied across the two ends of the capacitor, the molecules of the dielectric are polarized to form an electric field, and charges accumulate at both ends of the dielectric, thus storing energy. Connecting the positive electrode of the electrolytic capacitor to the second end of the primary winding of the pressure transfer inductor 130 and the negative electrode to the ground can receive the voltage of the primary winding of the pressure transfer inductor 130 and store electrical energy, and release the electrical energy when the power switch tube Q1 is disconnected.

[0066] In this embodiment, based on the cooperation of the conditioning switch tube Q2 and the conditioning capacitor C1 with the power input circuit 110, under the control of the second signal, the opening and closing of the conditioning switch tube Q2 are controlled, and then the voltage on the primary winding of the pressure transfer inductor 130 is comprehensively configured with the power input circuit 110 to facilitate the realization of the impulse control of the solenoid valve. There is no need to design an additional circuit or connect multiple circuits to the solenoid valve. Through the cooperation of the power input circuit 110 and the voltage conditioning circuit 150, the control of different states of the solenoid valve can be achieved, increasing the control convenience.

[0067] In an exemplary embodiment, such as Figure 5As shown in the figure, the drive conditioning circuit 170 includes a rectifying diode D3 and a storage capacitor C2. The cathode of the rectifying diode D3 is connected to the positive electrode of the storage capacitor C2 and the solenoid valve. The anode of the rectifying diode D3 is connected to the first end of the secondary winding of the pressure transmission inductor 130. The negative electrode of the storage capacitor C2 is connected to the solenoid valve and the second end of the secondary winding of the pressure transmission inductor 130.

[0068] Specifically, the rectifying diode D3 is used to limit the current direction in the drive conditioning circuit 170, make the control voltage conduct unidirectionally, rectify the control voltage transmitted by the secondary winding of the pressure transmission inductor 130, and the rectified control voltage is transmitted to the positive electrode of the storage capacitor C2, which is equivalent to applying the conditioned control voltage across the storage capacitor C2. The storage capacitor C2 discharges to the solenoid valve to drive the solenoid valve to be in the valve-holding or valve-closing state.

[0069] Among them, the rectifying diode D3 is composed of a PN junction. The P region is filled with holes and the N region is filled with electrons. Under normal circumstances, current can only flow from the positive electrode (P region) of the diode to the negative electrode (N region), and the reverse current is very small and can be almost ignored. This unidirectional conductivity can rectify the control voltage of the secondary winding of the pressure transmission inductor 130 into direct current. Further, the storage capacitor C2 can also be a polarized electrolytic capacitor. Optionally, the rectifying diode D3 can be a Schottky diode, and the storage capacitor C2 can be a 10uF electrolytic capacitor.

[0070] Further, the loop diode D2 can be used to release the excess electrical energy on the storage capacitor C2. When the storage capacitor C2 is not fully discharged, the valve-holding failure may occur during the subsequent solenoid valve control due to the relatively high charge of the storage capacitor C2. Therefore, the loop diode D2 can ensure the stable working state of the storage capacitor C2 by releasing the excess electrical energy on the storage capacitor C2.

[0071] If the power input circuit 110 includes a freewheeling diode D1, the loop diode D2 can transfer the electrical energy of the storage capacitor C2 to the freewheeling diode D1 through the primary winding of the pressure transmission inductor 130 for release.

[0072] In this embodiment, by setting the rectifying diode D3 and the storage capacitor C2 in the drive conditioning circuit 170, the control voltage is conditioned and the solenoid valve is driven based on the discharge of the storage capacitor C2, ensuring the reliability of the driving process. In combination with the loop diode D2, the stability of the solenoid valve drive control can also be increased.

[0073] Based on the same technical concept, the embodiment of the present application also provides a gas stove valve control system, as Figure 1As shown in the figure, the gas stove valve control system includes a solenoid valve 300 and the solenoid valve control circuit 100 described in each of the above embodiments. The solenoid valve 300 is disposed in the gas pipeline and is used to control the on-off of the gas flow path. When the solenoid valve 300 is closed, the gas flow path in the gas pipeline is disconnected. When the solenoid valve 300 is turned on, the gas flow path in the gas pipeline is turned on.

[0074] The solenoid valve control circuit 100 is connected to the solenoid valve 300 to control the closing and turning on of the solenoid valve 300, so that the solenoid valve 300 switches between off and on, thereby controlling whether the gas flow path is turned on. The solenoid valve 300 is connected to the positive pole of the battery of the gas stove. Optionally, the solenoid valve 300 can be connected to the positive pole of the battery through the housing of the whole machine. This enables the solenoid valve 300 itself to maintain a certain voltage. When the solenoid valve control circuit 100 outputs different voltages to the solenoid valve 300, the solenoid valve 300 can compare the voltage supplied by the battery with the voltage given by the solenoid valve control circuit 100 and perform corresponding off or on state switching based on the comparison result.

[0075] Further, in one embodiment, one end of the solenoid valve away from the solenoid valve control circuit is connected to a thermocouple. The thermocouple is a temperature sensor and can be used to detect the temperature of the gas stove flame. When the flame burns normally, the thermocouple is heated and generates an electromotive force, which can be used to maintain the open state of the solenoid valve. Once the flame of the gas stove goes out, the temperature of the thermocouple drops rapidly, and the electromotive force also decreases accordingly, causing the solenoid valve to close, thereby cutting off the gas supply and preventing gas leakage. In this embodiment, the thermocouple can assist in the on-off of the solenoid valve at one end away from the solenoid valve control circuit, improving the safety of the solenoid valve when used in a gas stove.

[0076] In addition, the present application also provides a gas stove, which includes the gas stove valve control system described in each of the above embodiments.

[0077] To better understand the above solution, the following will be explained in detail with a specific embodiment.

[0078] As Figure 5 shown, the solenoid valve control circuit includes a solenoid valve coil L2, a thermocouple R2, a circuit diode D2, a power switch tube Q1, a current limiting resistor R1, a freewheeling diode D1, a conditioning switch tube Q2, a conditioning capacitor C1, a rectifying diode D3, an energy storage capacitor C2, and a step-up / step-down inductor L1 (i.e., a pressure transfer inductor).

[0079] Among them, Vin is the input voltage and Vout is the output voltage; the power switch tube Q1 is a PNP type triode, and the conditioning switch tube Q2 is an NPN type triode; the conditioning capacitor C1 is an electrolytic capacitor of 10uF, and the energy storage capacitor C2 is an electrolytic capacitor of 100uF; the freewheeling diode D1, the loop diode D2, and the rectifier diode D3 are all Schottky diodes; the current-limiting resistor R1 is a 1K resistor, and the thermocouple R2 is a structural thermocouple; the buck-boost inductor L1 is a 200uH common-mode inductor, and the common-mode inductor L1 uses a turn ratio of 1:1; the solenoid valve coil L2 is a structural solenoid valve.

[0080] The power input terminal is connected to Vin; the solenoid valve load input terminal is connected to Vout; both ends of the resistor R1 are respectively connected to the base of the triode Q1 and the input signal 1 (the first signal); the emitter of the triode Q1 is connected to Vin, and the collector is connected to the cathode of D1 and the primary winding end of L1; the cathode of the diode D1 is connected to the collector of Q1, and the anode is grounded; the base of the triode Q2 is connected to the input signal 2 (the second signal), the collector is connected to the primary winding end of L1, and the emitter is grounded; the positive electrode of the electrolytic capacitor C1 is connected to the collector of Q2, and the negative electrode is connected to the emitter of Q2 and the ground; the anode of the diode D2 is connected to the positive electrode of C2, and the cathode is connected to the positive electrode of C1; the anode of the diode D3 is connected to the secondary winding of L1, and the cathode is connected to the positive electrode of C2; the positive electrode of the electrolytic capacitor C2 is connected to one end of the solenoid valve load L2, and the negative electrode is connected to the chassis of the whole machine. At this time, the chassis is connected to the positive pole of the battery; one end of the common potential of the solenoid valve L2 is connected to the positive pole of the battery, one end is connected to the thermocouple R2, and one end is connected to Vout.

[0081] Vin is a stable 3.3V input voltage; the chassis to which the equal-potential end of the L2 solenoid valve is connected is connected to the positive pole of the 3V battery. When low-voltage valve maintenance is required, the input signal 2 is constantly set low to keep Q2 in a constantly open state; the input signal 1 is a PWM wave with a frequency of 20KHz and a duty cycle of 30%; at this time, the voltage across C1 is 1V, and a current loop is provided through D2 (D2 consumes the excess charge on the C2 capacitor and does not allow the charge on C1 to affect the solenoid valve), realizing the valve maintenance action. When high-voltage valve flushing is required, the input signal 1 is constantly set low to keep Q1 constantly conducting; the input signal 2 gives a PWM signal with a frequency of 80KHz and a duty cycle of 45%; at this time, the voltage output from the secondary winding of the common-mode inductor and rectified by D3 to both ends of C2 is 6V, and 6V is supplied to the solenoid valve L2 to achieve the valve closing action. Optionally, different output voltages Vout can be achieved by adjusting different Vin and the frequency and duty cycle of the input PWM wave.

[0082] As described above, the solenoid valve can be regarded as two pairs of solenoid valve coils L2. The common points of the two pairs of coils are connected to the housing of the whole machine. The housing of the whole machine is connected to the positive pole of the battery at 3V. One of the other two points is provided with voltage by us for the valve maintenance and closing actions (at the place where C2 provides voltage), and the other point is provided with voltage by the thermocouple for the valve maintenance and closing actions (at R2). The execution of the valve maintenance and closing actions depends on currents in different directions. That is, compared with 3V, providing a voltage higher than 3V at C2 can close the valve (6V mentioned above), and providing a voltage lower than 3V at C2 can maintain the valve (1V mentioned above).

[0083] During low-voltage valve maintenance, Q2 is disconnected, and Q1 opens and closes following the pwm wave. At this time, Q1, L1, C1, and D1 form a step-down circuit. Only a small part of the energy transmitted from the primary is received by the secondary of L1. After being rectified by D3, the voltage across C2 is close to 1V (theoretical value); during high-voltage valve closing, L1 and Q2 form a step-up circuit. When Q2 is closed, the primary winding of L1 discharges and is transmitted to the secondary winding, generating a relatively large voltage across C2 of about 6V after passing through D3. C2 discharges to generate valve closing. Because the valve closing is an instantaneous action, if C2 does not discharge completely, the remaining energy is transmitted through D2 to D1 for discharge, preventing the valve maintenance from failing later because C2 has a relatively high charge.

[0084] In this embodiment, different input signals are used to output different voltages, directly controlling the two states of the solenoid valve, namely suction and disconnection. Based on the combination of the working states of the electric energy input circuit and the voltage conditioning circuit, and combined with the input voltage, the drive voltage of the pressure transmission inductor is comprehensively determined. Then, the control voltage is generated by isolating the pressure transmission inductor, enabling the drive conditioning circuit to control the solenoid valve based on different control voltages. The isolation between the drive voltage and the control voltage is achieved through the pressure transmission inductor, which can effectively prevent electrical shock and also reduce the damage caused by faults through isolation during a fault, improving the safety performance of the solenoid valve control process. At the same time, based on the common coordination of the electric energy input circuit and the voltage conditioning circuit, the magnitude of the drive voltage obtained on the primary winding of the pressure transmission inductor is changed, and then the magnitude of the isolated generated control voltage is changed, enabling flexible voltage adjustment of the solenoid valve. It realizes the control of different states of the solenoid valve based on one circuit, without connecting multiple circuits to the solenoid valve, making the control more convenient. The same circuit realizes two voltage outputs, reducing the number of circuits, saving motherboard space, and reducing costs.

[0085] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as within the scope described in this specification.

[0086] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A solenoid valve control circuit, characterized in that: The solenoid valve control circuit includes an electric energy input circuit, a pressure-transmitting inductor, a voltage conditioning circuit and a drive conditioning circuit, wherein the electric energy input circuit is connected to an input voltage and a first end of a primary winding of the pressure-transmitting inductor, the voltage conditioning circuit is connected to a second end of the primary winding of the pressure-transmitting inductor, and the drive conditioning circuit is connected to the solenoid valve and two ends of a secondary winding of the pressure-transmitting inductor; The driving voltage of the pressure-transmitting inductor is determined based on the input voltage, the working state of the power input circuit and the working state of the voltage conditioning circuit. The pressure-transmitting inductor generates a control voltage based on the driving voltage isolation. The driving conditioning circuit is used to control the solenoid valve based on the control voltage.

2. The solenoid valve control circuit according to claim 1, characterized in that: The pressure transmitting inductor is a common mode inductor.

3. The solenoid valve control circuit according to claim 1, characterized in that: The power input circuit includes a power switch tube, the output end of the power switch tube is connected to the pressure transmission inductor, the input end of the power switch tube is connected to the input voltage, and the control end of the power switch tube is connected to a first signal input end; the first signal input end is used to output a first signal to the control end of the power switch tube to control the working state of the power switch tube.

4. The solenoid valve control circuit according to claim 3, characterized in that: The electric energy input circuit also includes a current limiting resistor, and the current limiting resistor is arranged between the first signal input end and the control end of the electric energy switch tube.

5. The solenoid valve control circuit according to claim 3, characterized in that: The electric energy input circuit also includes a freewheeling diode, a cathode of the freewheeling diode is connected to the output end of the electric energy switch tube and the first end of the primary winding of the pressure-transmitting inductor, and an anode of the freewheeling diode is grounded.

6. The solenoid valve control circuit according to claim 1, characterized in that: The voltage conditioning circuit includes a conditioning switch tube and a conditioning capacitor, the input end of the conditioning switch tube and the first end of the conditioning capacitor are both connected to the second end of the primary winding of the pressure-transmitting inductor, the output end of the conditioning switch tube and the second end of the conditioning capacitor are both grounded, the control end of the conditioning switch tube is connected to the second signal input end, and the second signal input end is used to output a second signal to the control end of the conditioning switch tube to control the working state of the conditioning switch tube.

7. The solenoid valve control circuit according to claim 6, characterized in that: The conditioning capacitor is an electrolytic capacitor with polarity, the positive electrode of the electrolytic capacitor is connected to the second end of the primary winding of the pressure transmitting inductor, and the negative electrode of the electrolytic capacitor is grounded.

8. The solenoid valve control circuit according to claim 1, characterized in that: The drive conditioning circuit includes a rectifier diode and an energy storage capacitor, the cathode of the rectifier diode is connected to the positive electrode of the energy storage capacitor and the solenoid valve, the anode of the rectifier diode is connected to the first end of the secondary winding of the pressure-transmitting inductor, and the negative electrode of the energy storage capacitor is connected to the solenoid valve and the second end of the secondary winding of the pressure-transmitting inductor.

9. The solenoid valve control circuit according to any one of claims 1 to 8, characterized in that: The solenoid valve control circuit also includes a loop diode, an anode of the loop diode is connected to the solenoid valve and the secondary winding of the pressure-transmitting inductor, and a cathode of the loop diode is connected to the voltage conditioning circuit and the second end of the primary winding of the pressure-transmitting inductor.

10. A gas stove valve control system, characterized in that: The gas stove valve control system comprises a solenoid valve and a solenoid valve control circuit as described in any one of claims 1 to 9, wherein the solenoid valve is arranged in a gas pipeline, the solenoid valve control circuit is connected to the solenoid valve, and the solenoid valve is connected to the positive electrode of the battery of the gas stove.

11. The gas stove valve control system according to claim 10, characterized in that: One end of the solenoid valve away from the solenoid valve control circuit is connected to a thermocouple.

12. A gas stove, characterized in that: The gas stove comprises the gas stove valve control system according to any one of claims 10 to 11.

Images