Ignition flame sensing self-adaptive drive circuit and wall-mounted gas stove

Abstract

The utility model discloses an ignition flame sensing self-adaptive driving circuit and a gas wall-hanging stove, which are applied to gas equipment, and comprise a power supply modulation module, a signal modulation module, an ignition boosting module and a flame sensing module, a first input end of the signal modulation module is connected with a square wave signal given source to obtain a square wave signal, and a second input end of the signal modulation module is connected with a second input end of the flame sensing module; the second input end of the signal modulation module obtains power supply voltage, the signal modulation module superposes and modulates the square wave signal and the power supply voltage into a sine wave signal, the power end of the ignition boosting module is connected with the signal output end of the signal modulation module, and the controlled end of the ignition boosting module is used for being connected with the control module to obtain an ignition control signal. The output end of the ignition boosting module is connected with the ignition needle, the sampling end of the flame sensing module is connected with the signal output end of the signal modulation module and the current-conducting plate, the output end of the flame sensing module is used for being connected with the control module, the design structure is stable, the production cost is reduced, the production efficiency is improved, and detection is stable and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas equipment technical field especially point ignition flame self -adaptation drive circuit and gas wall -hanging stove. BACKGROUND

[0002] The existing gas equipment, for example, gas stove, gas wall -hanging stove etc., in addition to setting ignition needle on the furnace head, still need to set up flame sensor, and the flame sensor can detect whether the gas output by the furnace head is ignited, if not, need to shut off the valve in time.

[0003] And today's way of flame detection, whether it is to install a flame sensor or other ways, mostly need to transform the furnace body itself, and the structure of the flame sensor is relatively complex, and the cost is higher, the production efficiency is lower, and the subsequent maintenance is inconvenient, and the accuracy of other ways is not high, and the interference is big. UTILITY MODEL CONTENT

[0004] The utility model at least solves one of the technical problems in the prior art. To this end, the utility model provides a kind of ignition flame self-adaptive drive circuit and gas wall-hanging stove, and the structure is stable, reduces production cost, improves production efficiency, and detection is stable and reliable.

[0005] According to the first aspect embodiment of the utility model, a kind of ignition flame self-adaptive drive circuit is applied to gas equipment, and the gas equipment includes furnace head and ignition needle, the furnace head is provided with conducting plate, the conducting plate and ignition needle are set apart, and it is characterized in that, ignition flame self-adaptive drive circuit includes: power supply modulation module, the input end of the power supply modulation module is used to connect with power supply, and the output end of the power supply modulation module exports power supply voltage;Signal modulation module, the first input end of the signal modulation module is used to connect with square wave signal given source to obtain square wave signal, the second input end of the signal modulation module is connected with the output end of the power supply modulation module to obtain power supply voltage, and the signal modulation module is used to superimposed modulation square wave signal and power supply voltage into chord wave signal and exports chord wave signal by the signal output end of signal modulation module;Ignition boost module, the power supply end of the ignition boost module is connected with the signal output end of the signal modulation module, the controlled end of the ignition boost module is used to connect with control module to obtain ignition control signal, and the output end of the ignition boost module is connected with ignition needle;Flame sensing module, the sampling end of the flame sensing module is connected with the signal output end of the signal modulation module and conducting plate respectively, and the output end of the flame sensing module is used to connect with control module.

[0006] According to the utility model embodiment, a kind of ignition flame self-adaptive drive circuit has at least the following beneficial effects:

[0007] The utility model discloses ignition flame -sensing self -adaptation drive circuit, signal modulation module will square wave signal and power supply modulation module output's power supply voltage superimposes and forms the chord wave signal, when needing ignition, ignition boost module according to ignition control signal will chord wave signal boost and output to ignition needle, ignition needle produces electric arc and ignites gas, after the gas ignition produces flame, flame burns between furnace head and ignition needle, and flame ion makes ignition needle and conducting board between certain voltage threshold apply and conduct, the sampling end of flame -sensing module is connected with signal output end of signal modulation module and conducting board respectively, and chord wave signal is applied to conducting board, and the part higher than voltage threshold in chord wave signal will make ignition needle and conducting board between conduct, thereby chord wave signal higher than voltage threshold part is pulled low, equivalent to the peak value of the chord wave signal sampled when existing flame between ignition needle and conducting board is relatively lower than the peak value of the chord wave signal sampled when not existing flame between ignition needle and conducting board, and control module is connected with the output of flame -sensing module and obtains chord wave signal, and by comparing chord wave signal waveform, whether gas is ignited can be judged, and the design structure is stable, reduces production cost, improves production efficiency, and the detection is stable and reliable.

[0008] According to some embodiments of the utility model, the signal modulation module includes semiconductor switch tube Q6, semiconductor switch tube Q9, resistance R42, resistance R44, resistance R45 and resistance R51, the first end of resistance R51 is connected with square wave signal given source, the tail end of resistance R51 is connected with the first end of resistance R45 and the controlled end of switch tube Q9 respectively, the input end of switch tube Q9 is connected with the first end of resistance R44, the tail end of resistance R44 is connected with the first end of resistance R42 and the controlled end of switch tube Q6 respectively, the output end of switch tube Q9 and the tail end of resistance R45 are grounded, the input end of switch tube Q6 and the tail end of resistance R42 are connected with the output end of power modulation module, and the output end of switch tube Q6 forms the signal output end of signal modulation module.

[0009] According to some embodiments of the utility model, the ignition boost module includes boost unit, ignition switch unit, half wave rectification unit, resistance R83, diode D5 and capacitor C7, the controlled end of ignition switch unit is connected with control module to obtain ignition control signal, the input end of half wave rectification unit is connected with the signal output end of signal modulation module, the output end of half wave rectification unit is connected with the first end of resistance R83, the negative pole of diode D5, the input end of ignition switch unit and the first end of capacitor C7 respectively, the tail end of capacitor C7 is connected with the input end of boost unit, the output end of boost unit is connected with ignition needle, the tail end of resistance R83, the positive pole of diode D5 and the output end of ignition switch unit are grounded.

[0010] According to some embodiments of the present application, the ignition switch unit comprises a semiconductor switch tube Q2, a thyristor U6, a resistor R8, a resistor R28, a resistor R78 and a resistor R82, a head end of the resistor R82 is connected with the control module to obtain an ignition control signal, tail ends of the resistor R82 are respectively connected with a head end of the resistor R78 and a controlled end of the switch tube Q2, input ends of the switch tube Q2 are respectively connected with a head end of the resistor R8 and a head end of the resistor R28, a tail end of the resistor R8 is connected with a controlled end of the thyristor U6, an input end of the thyristor U6 is connected with an output end of the half-wave rectification unit, output ends of the thyristor U6, the switch tube Q2 and a tail end of the resistor R78 are all grounded, and a tail end of the resistor R28 is connected with a power supply.

[0011] According to some embodiments of the present application, the flame sensing module comprises a flame sensing sampling unit, a reference sampling unit, a resistor R31, a capacitor YM1 and a resistor R96, a head end of the capacitor YM1 is respectively connected with the conductive plate and a head end of the resistor R96, tail ends of the capacitor YM1 are respectively connected with a sampling end of the flame sensing sampling unit and a head end of the resistor R31, a tail end of the resistor R31 is connected with a sampling end of the reference sampling unit and a signal output end of the signal modulation module, the other end of the resistor R96 is grounded, and the control module is respectively connected with an output end of the flame sensing sampling unit and an output end of the reference sampling unit.

[0012] According to some embodiments of the present application, the flame sensing sampling unit comprises a resistor R9, a resistor R14, a resistor R22, a resistor R24 and a diode D6, a head end of the resistor R14 is respectively connected with a tail end of the capacitor YM1 and a head end of the resistor R31, tail ends of the resistor R14 are respectively connected with a head end of the resistor R24, a head end of the resistor R22 and a head end of the resistor R9, a tail end of the resistor R9 is respectively connected with a positive electrode of the diode D6 and the control module, a negative electrode of the diode D6 and the resistor R24 are both connected with a power supply, and a tail end of the resistor R22 is grounded.

[0013] According to some embodiments of the present application, the flame sensing module further comprises a voltage stabilizing unit, and a signal output end of the signal modulation module is connected with a tail end of the resistor R31 and a sampling end of the reference sampling unit through the voltage stabilizing unit.

[0014] According to some embodiments of the present application, the power supply voltage is greater than an output voltage of the power supply, or the power supply voltage is greater than 220V.

[0015] According to some embodiments of the present application, the power supply modulation module comprises a switching power supply module.

[0016] The gas wall-hanging stove according to the second aspect of the present application comprises the ignition flame-sensing self-adaptive driving circuit disclosed in any one of the above embodiments.

[0017] The gas wall-hanging stove according to the present application has at least the following beneficial effects:

[0018] The gas wall-hanging stove of the present application uses the ignition flame-sensing self-adaptive driving circuit disclosed in any one of the above embodiments for ignition and flame sensing, has a stable structure, reduces production cost, improves production efficiency, and is stable and reliable in detection.

[0019] The additional aspects and advantages of the present application will be partially given in the following description, and some will become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 FIG. 1 is a principle structure block diagram of one embodiment of the ignition flame-sensing self-adaptive driving circuit of the present application;

[0022] Figure 2 FIG. 2 is a circuit schematic diagram of the power modulation module of one embodiment of the ignition flame-sensing self-adaptive driving circuit of the present application;

[0023] Figure 3 FIG. 3 is a circuit schematic diagram of the signal modulation module, the ignition boost module and the flame-sensing module of one embodiment of the ignition flame-sensing self-adaptive driving circuit of the present application.

[0024] REFERENCE NUMERALS:

[0025] Burner head 110; Ignition needle 120; Conductive plate 130; Power modulation module 200; Switching power supply chip 210; Current detection unit 220; Voltage detection unit 230; Signal modulation module 300; Ignition boost module 400; Boost unit 410; Ignition switch unit 420; Half-wave rectification unit 430; Flame-sensing module 500; Flame-sensing sampling unit 510; Reference sampling unit 520; Voltage stabilizing unit 530; Control module 600. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0027] In the description of the utility model, it needs to be understood that, if the direction description is involved, for example, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model.

[0028] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, second is described, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0029] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] As Figures 1 to 3As shown, the ignition pilot flame adaptive driving circuit according to the first aspect embodiment of the utility model is applied to a gas equipment, the gas equipment includes a burner 110 and an ignition needle 120, the burner 110 is provided with a conductive plate 130, the conductive plate 130 and the ignition needle 120 are arranged apart, the ignition pilot flame adaptive driving circuit includes a power modulation module 200, a signal modulation module 300, an ignition boost module 400 and a pilot flame module 500, the input end of the power modulation module 200 is used to be connected with power supply, the output end of the power modulation module 200 outputs power supply voltage, the first input end of the signal modulation module 300 is used to be connected with square wave signal given source to obtain square wave signal, the second input end of the signal modulation module 300 is connected with the output end of the power modulation module 200 to obtain power supply voltage, the signal modulation module 300 is used to superimposed modulation square wave signal and power supply voltage into chord wave signal and outputs chord wave signal through the signal output end of signal modulation module 300, the power end of the ignition boost module 400 is connected with the signal output end of the signal modulation module 300, the controlled end of the ignition boost module 400 is used to be connected with control module 600 to obtain ignition control signal, the output end of the ignition boost module 400 is connected with the ignition needle 120, the sampling end of the pilot flame module 500 is connected with the signal output end of the signal modulation module 300 and the conductive plate 130 respectively, the output end of the pilot flame module 500 is used to be connected with control module 600.

[0031] The ignition pilot flame adaptive driving circuit can be applied to various gas equipment, for example, gas stove, gas water heater, gas wall-hanging stove, etc.

[0032] The gas equipment usually includes a control module 600, which is usually composed of a processor such as MCU or CPU and its attached circuit, and the gas source is connected with the burner 110 through a switch valve, and the control module 600 controls the switch valve.

[0033] The ignition needle 120 is located above the gas outlet of the burner 110, and when the ignition needle 120 is powered to generate an electric arc, it will ignite the gas output by the burner 110, thereby realizing ignition, and the conductive plate 130 can be a copper sheet and is located below the ignition needle 120.

[0034] In some embodiments of the utility model, as Figure 2As shown, the power modulation module 200 includes a switching power supply module, specifically, the switching power supply module includes a switching power supply chip 210, a semiconductor switching tube Q22, a transformer T1, a diode D21, a current detection unit 220 and a voltage detection unit 230, wherein the diode D21 constitutes a rectifier unit, a power supply is connected with one end of the transformer, the center tap of the transformer is connected with the input end of the switching tube Q22, the output end of the switching tube Q22 is grounded, the other end of the transformer forms a power supply voltage after rectification through the diode D21, the current detection unit 220 can include a sampling resistor R95 connected in series with the switching tube Q22, the switching power supply chip 210 obtains the terminal voltage of the sampling resistor R95 to analyze the modulation current, the voltage detection unit 230 can include a resistor voltage division sampling circuit, specifically including resistors R121 and R120, the resistors R121 and R120 are connected in series, the first end of the resistor R120 is connected with the negative electrode of the diode D21, and the switching power supply chip 210 obtains the terminal voltage of the resistor R121 to analyze the output voltage; the switching power supply chip 210 controls the operation of the switching tube Q22 according to the output voltage and the modulation current, so as to adjust the size of the power supply voltage.

[0035] The ignition flame sensing self-adaptive driving circuit, the signal modulation module 300 superimposes the square wave signal and the power supply voltage output by the power modulation module 200 to form a sine wave signal, when ignition is needed, the ignition boost module 400 boosts the sine wave signal according to the ignition control signal and outputs the sine wave signal to the ignition needle 120, the ignition needle 120 generates an electric arc to ignite the gas, after the gas is ignited to generate a flame, the flame burns between the furnace head 110 and the ignition needle 120, the flame ions make the ignition needle 120 and the conductive plate 130 conduct under a certain voltage threshold, the sampling end of the flame sensing module 500 is connected with the signal output end of the signal modulation module 300 and the conductive plate 130, the sine wave signal is applied to the conductive plate 130, and the part of the sine wave signal higher than the voltage threshold makes the ignition needle 120 and the conductive plate 130 conduct, so as to pull down the part of the sine wave signal higher than the voltage threshold, which is equivalent to that the peak value of the sampled sine wave signal when the flame exists between the ignition needle 120 and the conductive plate 130 is relatively lower than the peak value of the sampled sine wave signal when the flame does not exist between the ignition needle 120 and the conductive plate 130, the control module 600 is connected with the output end of the flame sensing module 500 to obtain the sine wave signal, and whether the gas is ignited can be judged by comparing the sine wave signal waveforms, the control module 600 is connected with the output end of the flame sensing module 500 to obtain the sine wave signal, and whether the gas is ignited can be judged, the design structure is stable, production cost is reduced, production efficiency is improved, and detection is stable and reliable.

[0036] In some embodiments of the utility model, such as Figure 3As shown, the signal modulation module 300 comprises a semiconductor switch Q6, a semiconductor switch Q9, a resistor R42, a resistor R44, a resistor R45, and a resistor R51. The resistor R51 has a first end connected to a square wave signal source, a second end connected to a first end of the resistor R45 and a control end of the switch Q9. An input end of the switch Q9 is connected to a first end of the resistor R44, and a second end of the resistor R44 is connected to a first end of the resistor R42 and a control end of the switch Q6. An output end of the switch Q9 and a second end of the resistor R45 are grounded. An input end of the switch Q6 and a second end of the resistor R42 are connected to an output end of the power supply modulation module 200. An output end of the switch Q6 forms a signal output end of the signal modulation module 300.

[0037] The switch Q6 and the switch Q9 can be a triode or a MOS tube. The square wave signal is output to the switch Q9, and the switch Q9 drives the switch Q6 to turn on or off according to the square wave signal. The power supply voltage is modulated into a sine wave signal by the switch Q6.

[0038] In some embodiments of the present application, as shown in Figure 3 As shown, the ignition boost module 400 comprises a boost unit 410, an ignition switch unit 420, a half-wave rectifier unit 430, a resistor R83, a diode D5, and a capacitor C7. A control end of the ignition switch unit 420 is connected to the control module 600 to obtain an ignition control signal. An input end of the half-wave rectifier unit 430 is connected to a signal output end of the signal modulation module 300. Output ends of the half-wave rectifier unit 430 are connected to a first end of the resistor R83, a negative electrode of the diode D5, an input end of the ignition switch unit 420, and a first end of the capacitor C7. A second end of the capacitor C7 is connected to an input end of the boost unit 410. An output end of the boost unit 410 is connected to the ignition needle 120. A second end of the resistor R83, a positive electrode of the diode D5, and an output end of the ignition switch unit 420 are grounded.

[0039] The half-wave rectifier unit 430 rectifies the sine wave signal to obtain a sine wave signal of a positive half cycle or a negative half cycle, so that the subsequent control module 600 can compare and judge the flame signal.

[0040] When the ignition is not on, the ignition switch unit 420 is turned on, so that the input of the boost unit 410 is pulled low, and the boost unit 410 does not supply power to the ignition needle 120 to strike the arc. When the control module 600 outputs an ignition signal to control the ignition switch unit 420 to be disconnected, the output end of the half-wave rectifier unit 430 outputs a half-cycle sine wave signal to the boost unit 410. The boost unit 410 supplies power to the ignition needle 120 after boosting, and the ignition needle 120 generates an electric arc to ignite the gas.

[0041] In some embodiments of the utility model, as shown in Figure 3 The ignition switch unit 420 includes a semiconductor switch Q2, a silicon controlled rectifier U6, a resistor R8, a resistor R28, a resistor R78, and a resistor R82. The first end of the resistor R82 is connected to the control module 600 to obtain an ignition control signal. The tail end of the resistor R82 is connected to the first end of the resistor R78 and the controlled end of the switch Q2. The input end of the switch Q2 is connected to the first end of the resistor R8 and the first end of the resistor R28. The tail end of the resistor R8 is connected to the controlled end of the silicon controlled rectifier U6. The input end of the silicon controlled rectifier U6 is connected to the output end of the half-wave rectifier unit 430. The output end of the silicon controlled rectifier U6, the output end of the switch Q2, and the tail end of the resistor R78 are all grounded. The tail end of the resistor R28 is connected to a power supply.

[0042] The switch Q2 can be selected from a triode or a MOS tube. When the control module 600 outputs an ignition control signal to the switch Q2, the switch Q2 is turned on to ground, thereby causing the controlled end of the silicon controlled rectifier U6 to be pulled low, the silicon controlled rectifier U6 to be turned off, and the output end of the half-wave rectifier unit 430 to output a half-cycle sine wave signal to the voltage boosting unit 410.

[0043] Specifically, the half-wave rectifier unit 430 can include a diode D1. The positive electrode of the diode D1 is connected to the signal output end of the signal modulation module 300 to output a sine wave signal. The negative electrode of the diode D1 is connected to the first end of a capacitor C7, the first end of a resistor R83, the negative electrode of a diode D5, and the input end of the ignition switch unit 420.

[0044] In some embodiments of the utility model, as shown in Figure 3 The flame sensing module 500 includes a flame sensing sampling unit 510, a reference sampling unit 520, a resistor R31, a capacitor YM1, and a resistor R96. The first end of the capacitor YM1 is connected to the conductive plate 130 and the first end of the resistor R96. The tail end of the capacitor YM1 is connected to the sampling end of the flame sensing sampling unit 510 and the first end of the resistor R31. The tail end of the resistor R31 is connected to the sampling end of the reference sampling unit 520 and the signal output end of the signal modulation module 300. The other end of the resistor R96 is grounded. The control module 600 is connected to the output end of the flame sensing sampling unit 510 and the output end of the reference sampling unit 520.

[0045] The string wave signal is output by a signal output end of the signal modulation module 300, a standard string wave signal is acquired by the reference sampling unit 520 as a contrast reference, the string wave signal is divided by the resistor R31 and output to the flame sampling unit 510 and applied to the conductive plate 130, based on the ion characteristics released by the flame burning, when the ignition needle 120 and the conductive plate 130 are applied with voltage and the voltage reaches a certain threshold, the ignition needle 120 and the conductive plate 130 are discharged, the part of the string wave signal higher than the voltage threshold is pulled down below the voltage threshold, the flame sampling unit 510 samples the string wave signal and outputs to the control module 600, the control module 600 can judge whether the flame exists through comparison.

[0046] In some embodiments of the present application, as shown in Figure 3 The flame sampling unit 510 includes the resistor R9, the resistor R14, the resistor R22, the resistor R24 and the diode D6, the first end of the resistor R14 is connected with the tail end of the capacitor YM1 and the first end of the resistor R31 respectively, the tail end of the resistor R14 is connected with the first end of the resistor R24, the first end of the resistor R22 and the first end of the resistor R9 respectively, the tail end of the resistor R9 is connected with the positive electrode of the diode D6 and the control module 600 respectively, the negative electrode of the diode D6 and the resistor R24 are connected with the power supply, and the tail end of the resistor R22 is grounded.

[0047] Specifically, the power supply voltage is greater than the output voltage of the power supply, or the power supply voltage is greater than 220V.

[0048] It can be understood that in the actual manufacturing process of the existing part of the gas equipment, the circuit board is not grounded, when the flame sampling unit 510 samples the flame signal, the flame signal is not discharged to the ground, which leads to inaccurate sampling, therefore, the power supply voltage is set to be greater than the output voltage of the power supply, or generally, the power supply is external power supply, and the voltage of the power supply is 220V, therefore, the power supply voltage is set to be greater than 220V, specifically, in some embodiments of the present application, the power supply voltage can be set to 260V, and correspondingly, the peak value of the string wave signal can also be 260V.

[0049] In some embodiments of the present application, as shown in Figure 3 The reference sampling unit 520 includes the resistor R37, the resistor R23, the resistor R26, the capacitor C6 and the diode D8, the first end of the resistor R37 is connected with the tail end of the resistor R31 respectively, the tail end of the resistor R37 is connected with the first end of the resistor R23, the first end of the resistor R26, one end of the capacitor C6, the control module and the positive electrode of the diode D8 respectively, the negative electrode of the diode D8 and the tail end of the resistor R26 are connected with the power supply, and the tail end of the resistor R23 and the tail end of the capacitor C6 are grounded.

[0050] In some embodiments of the utility model, such as Figure 3 As shown in the figure, the flame sensing module 500 further comprises a voltage stabilizing unit 530, and the signal output end of the signal modulation module 300 is connected with the tail end of the resistor R31 and the sampling end of the reference sampling unit 520 through the voltage stabilizing unit 530. The voltage stabilizing unit 530 can keep the stability of the sine wave signal, thereby improving the accuracy of the judgment.

[0051] Specifically, the voltage stabilizing unit 530 comprises diode D10 and diode D11 connected in reverse series.

[0052] The voltage stabilizing unit 530 can further comprise capacitor C17, resistor R39 and resistor R41, the anode of diode D10 and the anode of diode D11 are connected, the cathode of diode D11 is grounded, the head end of capacitor C17 is connected with the cathode of diode D10, the tail end of resistor R31 and the sampling end of the reference sampling unit 520 respectively, the tail end of capacitor R17 is connected with the head end of resistor R39, and the tail end of resistor R39 is connected with the head end of resistor R41 and the signal output end of the signal modulation module 300 respectively.

[0053] According to the gas wall-hanging stove of the second aspect of the utility model, the ignition flame sensing self-adaptive driving circuit disclosed in any of the above embodiments is used for ignition and flame sensing.

[0054] The gas wall-hanging stove can comprise a water pipe and a burner head for heating the water pipe, the water pipe is used for transmitting water to be heated, the ignition needle 120 is located above the gas outlet of the burner head 110, and when the ignition needle 120 generates an electric arc, the ignition needle 120 can ignite the gas output by the burner head 110, thereby realizing ignition, and the conductive plate 130 can be a copper sheet and is located below the ignition needle 120.

[0055] The gas wall-hanging stove of the utility model uses the ignition flame sensing self-adaptive driving circuit disclosed in any of the above embodiments for ignition and flame sensing, has stable structure, reduces production cost, improves production efficiency, and is stable and reliable in detection.

[0056] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that the combinations are within the scope of the present application.

[0057] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A spark-sensitive self-adaptive driving circuit applied to a gas device, the gas device comprising a burner head and a sparking needle, a conductive plate being arranged on the burner head, the conductive plate and the sparking needle being arranged in a spaced-apart manner, characterized in that, The ignition flame-sensing adaptive driving circuit comprises: a power supply modulation module, an input end of the power supply modulation module being used for being connected with a power supply, and an output end of the power supply modulation module outputting a power supply voltage; a signal modulation module, a first input end of the signal modulation module being used for being connected with a square wave signal given source to obtain a square wave signal, a second input end of the signal modulation module being connected with the output end of the power supply modulation module to obtain the power supply voltage, the signal modulation module being used for superimposedly modulating the square wave signal and the power supply voltage into a sine wave signal and outputting the sine wave signal through a signal output end of the signal modulation module; an ignition boost module, a power supply end of the ignition boost module being connected with the signal output end of the signal modulation module, a controlled end of the ignition boost module being used for being connected with a control module to obtain an ignition control signal, and an output end of the ignition boost module being connected with an ignition needle; a flame-sensing module, sampling ends of the flame-sensing module being respectively connected with the signal output end of the signal modulation module and a conductive plate, and an output end of the flame-sensing module being used for being connected with the control module.

2. The pilot-adaptive driving circuit according to claim 1, wherein: The signal modulation module comprises a semiconductor switch tube Q6, a semiconductor switch tube Q9, a resistor R42, a resistor R44, a resistor R45 and a resistor R51, a first end of the resistor R51 being connected with the square wave signal given source, a tail end of the resistor R51 being respectively connected with a first end of the resistor R45 and a controlled end of the switch tube Q9, an input end of the switch tube Q9 being connected with a first end of the resistor R44, a tail end of the resistor R44 being respectively connected with a first end of the resistor R42 and a controlled end of the switch tube Q6, an output end of the switch tube Q9 and a tail end of the resistor R45 being grounded, an input end of the switch tube Q6 and a tail end of the resistor R42 being connected with the output end of the power supply modulation module, and an output end of the switch tube Q6 forming the signal output end of the signal modulation module.

3. The flame-responsive adaptive driving circuit of claim 1, wherein: The ignition boost module comprises a boost unit, an ignition switch unit, a half-wave rectification unit, a resistor R83, a diode D5 and a capacitor C7, a controlled end of the ignition switch unit being connected with the control module to obtain the ignition control signal, an input end of the half-wave rectification unit being connected with the signal output end of the signal modulation module, output ends of the half-wave rectification unit being respectively connected with a first end of the resistor R83, a negative electrode of the diode D5, an input end of the ignition switch unit and a first end of the capacitor C7, a tail end of the capacitor C7 being connected with an input end of the boost unit, an output end of the boost unit being connected with the ignition needle, a tail end of the resistor R83, a positive electrode of the diode D5 and an output end of the ignition switch unit being grounded.

4. The pilot-adaptive driving circuit according to claim 3, wherein: The ignition switch unit comprises a semiconductor switch Q2, a thyristor U6, a resistor R8, a resistor R28, a resistor R78 and a resistor R82. The leading end of the resistor R82 is connected to the control module to obtain an ignition control signal. The tail end of the resistor R82 is connected to the leading end of the resistor R78 and the controlled end of the switch Q2. The input end of the switch Q2 is connected to the leading end of the resistor R8 and the leading end of the resistor R28. The tail end of the resistor R8 is connected to the controlled end of the thyristor U6. The input end of the thyristor U6 is connected to the output end of the half-wave rectification unit. The output end of the thyristor U6, the output end of the switch Q2 and the tail end of the resistor R78 are grounded. The tail end of the resistor R28 is connected to a power supply.

5. The flame-responsive adaptive driver circuit of claim 1, wherein: The flame sensing module comprises a flame sensing sampling unit, a reference sampling unit, a resistor R31, a capacitor YM1 and a resistor R96. The leading end of the capacitor YM1 is connected to the conductive plate and the leading end of the resistor R96. The tail end of the capacitor YM1 is connected to the sampling end of the flame sensing sampling unit and the leading end of the resistor R31. The tail end of the resistor R31 is connected to the sampling end of the reference sampling unit and the signal output end of the signal modulation module. The other end of the resistor R96 is grounded. The control module is connected to the output end of the flame sensing sampling unit and the output end of the reference sampling unit.

6. An adaptive pilot flame drive circuit according to claim 5, wherein: The flame sensing sampling unit comprises a resistor R9, a resistor R14, a resistor R22, a resistor R24 and a diode D6. The leading end of the resistor R14 is connected to the tail end of the capacitor YM1 and the leading end of the resistor R31. The tail end of the resistor R14 is connected to the leading end of the resistor R24, the leading end of the resistor R22 and the leading end of the resistor R9. The tail end of the resistor R9 is connected to the positive electrode of the diode D6 and the control module. The negative electrode of the diode D6 and the resistor R24 are connected to a power supply. The tail end of the resistor R22 is grounded.

7. An adaptive pilot flame drive circuit according to claim 6, wherein: The flame sensing module further comprises a voltage stabilizing unit. The signal output end of the signal modulation module is connected to the tail end of the resistor R31 and the sampling end of the reference sampling unit through the voltage stabilizing unit.

8. The pilot-adaptive driving circuit according to claim 6, wherein: The power supply voltage is greater than the output voltage of the power supply, or the power supply voltage is greater than 220V.

9. The flame-responsive adaptive driver circuit of claim 1, wherein: The power supply modulation module comprises a switching power supply module.

10. A gas-fired wall-hung boiler, characterized in that, An ignition flame sensing self-adaptive driving circuit as claimed in any one of claims 1 to 9.

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