Parametrically adjustable flame signal sensing circuit, combustion device and controller thereof

Abstract

The utility model relates to combustion equipment control technical field discloses a parameter adjustable flame signal sensing circuit, combustion equipment and controller thereof, including signal processing unit, alternating current power supply unit and flame detection electrode, signal processing unit includes gain adjusting unit and amplifier, wherein, one end of gain adjusting unit is connected with the first input of amplifier, the other end is connected with the output of amplifier, when the resistance of gain adjusting unit changes, the amplification multiple of the primary detection signal that amplifier senses the flame detection electrode changes, the output of amplifier is still connected with the control unit of combustion equipment, and the flame detection signal is output to the control unit, the first input of amplifier is still connected with the flame detection electrode, and the second input of amplifier is still grounded, one end of alternating current power supply unit is grounded, and the other end is connected with the first input of amplifier and flame detection electrode. Effectively promote the adaptability of flame signal sensing circuit and combustion equipment.

Description

Technical Field

[0001] This utility model relates to the field of combustion equipment control technology, specifically to a flame signal sensing circuit with adjustable parameters, a combustion device and its controller. Background Technology

[0002] Gas water heaters are widely used, and flame ion current sensing and detection is one of the key processes in the use of gas water heaters. The accuracy of flame ion current sensing and detection plays a vital role in the safety and reliability of combustion equipment such as gas water heaters.

[0003] Related technologies include adjusting the opening of the gas proportional valve based on the magnitude of the ion current detected by the flame ion current sensing and detection circuit. However, the flame ion current sensing and detection circuit usually uses a uniform fixed parameter device, which cannot adapt to different operating conditions and combustion equipment models. Utility Model Content

[0004] In view of this, the present invention provides a flame signal sensing circuit with adjustable parameters, a combustion device and its controller. The flame signal sensing circuit is equipped with a gain adjustment unit, which can adjust the amplification factor of the initial detection signal sensed by the flame detection electrode, which helps to adapt to different working conditions and models of combustion devices.

[0005] In the first aspect, this utility model provides a flame signal sensing circuit with adjustable parameters, which is applied to combustion equipment. The circuit includes a signal processing unit, an AC power supply unit, and a flame detection electrode.

[0006] The signal processing unit includes a gain adjustment unit and an amplifier;

[0007] One end of the gain adjustment unit is connected to the first input terminal of the amplifier, and the other end is connected to the output terminal of the amplifier. When the resistance of the gain adjustment unit changes, the amplification factor of the amplifier to the initial detection signal sensed by the flame detection electrode changes.

[0008] The amplifier's output is also connected to the control unit of the combustion equipment, outputting a flame detection signal to the control unit. The amplifier's first input is also connected to the flame detection electrode, and the amplifier's second input is grounded.

[0009] One end of the AC power supply unit is grounded, and the other end is connected to the first input terminal of the amplifier and the flame detection electrode.

[0010] This invention relates to an adjustable flame signal sensing circuit. A gain adjustment unit is configured within the flame signal sensing circuit, with one end connected to the first input terminal of the amplifier in the flame signal sensing circuit and the other end connected to the output terminal of the amplifier. When the resistance of the gain adjustment unit changes, the amplification factor of the initial detection signal sensed by the flame detection electrode changes. Therefore, by configuring a gain adjustment unit in the flame signal sensing circuit, the amplification factor of the initial detection signal sensed by the flame detection electrode can be adjusted, which helps to adapt to different operating conditions and models of combustion equipment. After adjusting the amplification factor of the signal at the amplifier's output terminal, a feedback signal adapted to the current operating condition and the current combustion equipment model is fed back to the first input terminal of the amplifier. This results in a more accurate flame sensing signal, effectively improving the timeliness and accuracy of flame signal sensing, and thus significantly improving the control precision and safety factor of the combustion equipment.

[0011] In some alternative implementations, the circuit further includes:

[0012] The first resistor has one end connected to the flame detection electrode and the other end connected to both the AC power supply unit and the signal processing unit.

[0013] In some optional implementations, the signal processing unit further includes:

[0014] The first capacitor has one end grounded and the other end connected to the first input terminal of the amplifier.

[0015] The second resistor has one end connected to the first input terminal of the amplifier and the other end connected to the first capacitor.

[0016] The third resistor has one end connected to both the second resistor and the first capacitor, and the other end connected to the flame detection electrode.

[0017] In some alternative implementations, the AC power supply unit includes an AC signal source and a second capacitor;

[0018] One end of the AC signal source is grounded, and the other end is connected to the second capacitor;

[0019] The other end of the second capacitor is connected to both the flame detection electrode and the signal processing unit.

[0020] In some alternative implementations, the gain adjustment unit includes a digital potentiometer, one end of which is connected to a first input terminal of the amplifier and the other end of which is connected to the output terminal of the amplifier.

[0021] In some alternative implementations, the gain adjustment unit includes a manual adjustment potentiometer, one end of which is connected to the first input terminal of the amplifier and the other end of which is connected to the output terminal of the amplifier.

[0022] In some alternative implementations, the gain adjustment unit includes a microprocessor that is communicatively connected to the control unit for receiving the target gain of the amplifier sent by the control unit. One end of the microprocessor is connected to the first input terminal of the amplifier, and the other end is connected to the output terminal of the amplifier.

[0023] Secondly, this utility model also provides a controller for a combustion device, comprising:

[0024] Control unit;

[0025] And a flame signal sensing circuit with adjustable parameters according to the first aspect above or any corresponding embodiment.

[0026] Thirdly, this utility model also provides a controller for a combustion device, comprising:

[0027] Control unit;

[0028] The gain adjustment unit in the first aspect mentioned above includes a flame signal sensing circuit with adjustable parameters of a manually adjustable potentiometer.

[0029] The controller housing contains an adjustable flame signal sensing circuit. The controller housing has an opening that is directly opposite the adjustment section of the manual adjustment potentiometer.

[0030] Fourthly, this utility model provides a combustion device, comprising:

[0031] The controller of the second aspect or the controller of the third aspect mentioned above;

[0032] The display is connected in communication with the control unit of the controller and is used to display the current output value of the flame signal sensing circuit to the control unit in debug mode. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the principle of a parameter-adjustable flame signal sensing circuit according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of another parameter-adjustable flame signal sensing circuit according to an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of another parameter-adjustable flame signal sensing circuit according to an embodiment of the present utility model.

[0037] Figure 4 A schematic diagram showing the layout of the controller housing and the terminals of the controller's external components is provided. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] This invention provides a flame signal sensing circuit with adjustable parameters, a combustion device, and a controller thereof, to adjust the amplification factor of the initial detection signal sensed by the flame detection electrode, which helps to adapt to different operating conditions and models of combustion devices. The embodiments of this invention are described below with reference to the accompanying drawings.

[0044] According to an embodiment of this utility model, a flame signal sensing circuit with adjustable parameters is provided, which is applied to combustion equipment. Figure 1 This is a schematic diagram of the principle of a parameter-adjustable flame signal sensing circuit according to an embodiment of the present invention, with reference to... Figure 1 The adjustable flame signal sensing circuit of this utility model includes a signal processing unit 2, an AC power supply unit 3, and a flame detection electrode J1.

[0045] In this embodiment, the signal processing unit includes a gain adjustment unit 21 and an amplifier U1. One end of the gain adjustment unit 21 is connected to the first input terminal of the amplifier (shown as the negative feedback terminal "-" of the amplifier U1 in the figure), and the other end is connected to the output terminal of the amplifier U1. When the resistance of the gain adjustment unit 21 changes, the amplification factor of the amplifier U1 on the initial detection signal sensed by the flame detection electrode J1 changes.

[0046] The output of amplifier U1 is also connected to the control unit 1 of the combustion device, and outputs a flame detection signal to the control unit 1. The first input of the amplifier is also connected to the flame detection electrode, and the second input of the amplifier (shown as the positive feedback terminal "+" of amplifier U1 in the figure) is also grounded.

[0047] One end of the AC power supply unit 30 is grounded, and the other end is connected to the first input terminal of the amplifier U1 and the flame detection electrode J1.

[0048] Amplifier U1 receives the initial detection signal sensed by flame detection electrode J1 through its first input terminal. This initial detection signal is then input to the signal processing unit via the negative feedback terminal of amplifier U1. Amplifier U1 then sends the amplified detection voltage signal to the control unit 1 of the combustion equipment for identification. Control unit 1 can be an MCU (microprocessor) chip. During the process of judging the amplified detection voltage signal, control unit 1 can adjust the parameters of gain adjustment unit 21 based on the actual detection value β received by amplifier U1. Specifically, the parameters of gain adjustment unit 21 can be adjusted with the goal of ensuring that the deviation between the actual detection value β and the preset initial value α is less than a set deviation threshold σ. The initial value α can be set according to the model of the combustion equipment and its actual operating conditions. Therefore, the parameters of gain adjustment unit 21 can adapt to different models of combustion equipment and various actual operating conditions. The set deviation threshold σ can be zero or other suitable values.

[0049] During the adjustment process of gain adjustment unit 21, the resistance value of gain adjustment unit 21 itself changes. Here, the resistance value of gain adjustment unit 21 is recorded as the resistance value of feedback resistor. The signal at the output terminal of amplifier U1 is fed back to the negative feedback terminal of amplifier U1 by feedback resistor with a corresponding return coefficient. Amplifier U1 subtracts the signal returned from the negative feedback terminal from the initial detection signal sensed by flame detection electrode J1. Thus, by adjusting the resistance value of gain adjustment unit 21 itself, the amplification factor of amplifier U1 is adjusted.

[0050] Therefore, the adjustable flame signal sensing circuit of this invention incorporates a gain adjustment unit. One end of the gain adjustment unit is connected to the first input terminal of the amplifier in the flame signal sensing circuit, and the other end is connected to the output terminal of the amplifier. When the resistance of the gain adjustment unit changes, the amplification factor of the initial detection signal sensed by the flame detection electrode changes. Thus, by configuring a gain adjustment unit in the flame signal sensing circuit, the amplification factor of the initial detection signal sensed by the flame detection electrode can be adjusted, which helps to adapt to different operating conditions and models of combustion equipment. After adjusting the amplification factor of the signal at the output terminal of the amplifier, a feedback signal adapted to the current operating condition and the current model of combustion equipment is fed back to the first input terminal of the amplifier. This results in a more accurate flame sensing signal, effectively improving the timeliness and accuracy of flame signal sensing, and thus significantly improving the control precision and safety factor of the combustion equipment.

[0051] According to an embodiment of this utility model, a flame signal sensing circuit with adjustable parameters is provided, which is applied to combustion equipment. Figure 2 This is a schematic diagram of another parameter-adjustable flame signal sensing circuit according to an embodiment of the present invention, for reference. Figure 2The adjustable flame signal sensing circuit of this utility model includes a signal processing unit 2, an AC power supply unit 3, and a flame detection electrode J1.

[0052] In this embodiment, the adjustable flame signal sensing circuit further includes a first resistor R1. One end of the first resistor R1 is connected to the flame detection electrode J1, and the other end is connected to both the AC power supply unit 3 and the signal processing unit 2.

[0053] In some alternative implementations, the signal processing unit 20 further includes a first capacitor C1, a second resistor R2, and a third resistor R3.

[0054] In this configuration, one end of the first capacitor C1 is grounded, and the other end is connected to the first input terminal of the amplifier U1. One end of the second resistor R2 is connected to the first input terminal of the amplifier, and the other end is connected to the first capacitor C1. One end of the third resistor R3 is connected to both the second resistor and the first capacitor, and the other end is connected to the flame detection electrode J1.

[0055] In some optional embodiments, the AC power supply unit 3 includes an AC signal source S1 and a second capacitor C2. One end of the AC signal source S1 is grounded, and the other end is connected to the second capacitor C2. The other end of the second capacitor C2 is connected to both the flame detection electrode J1 and the signal processing unit 20.

[0056] Therefore, the adjustable flame signal sensing circuit senses the flame ion flow of the flame burner 4 through the AC signal voltage provided by the AC power supply unit 3. Specifically, the flame ion flow signal can be detected by the flame detection electrode J1, coupled and converted by the second capacitor C2 connected to the AC signal source S1, and after delay and filtering by the third resistor R3 and the first capacitor C1, the initial detection signal is fed back to the amplifier U1.

[0057] In some alternative implementations, the gain adjustment unit 201 includes a digital potentiometer RL1, one end of which is connected to the first input terminal of the amplifier and the other end of which is connected to the output terminal of the amplifier U1.

[0058] Here, amplifier U1, second resistor R2 and digital potentiometer RL1 form a negative feedback signal amplification circuit, and amplifier U1 sends the amplified detection voltage value to the control unit 1 of the combustion device for identification.

[0059] In some alternative embodiments, the gain adjustment unit 21 does not use the digital potentiometer RL1, but instead employs a manual adjustment potentiometer. One end of the manual adjustment potentiometer is connected to the first input terminal of the amplifier, and the other end is connected to the output terminal of the amplifier U1. The manual adjustment potentiometer functions the same as the digital potentiometer RL1 in the flame signal sensing circuit, except that the manual adjustment potentiometer needs to be manually adjusted according to the actual situation when the model of the combustion equipment or the actual operating conditions change.

[0060] According to an embodiment of this utility model, a flame signal sensing circuit with adjustable parameters is provided, which is applied to combustion equipment. Figure 3 This is a schematic diagram of another parameter-adjustable flame signal sensing circuit according to an embodiment of the present invention, with reference to... Figure 3 The adjustable flame signal sensing circuit of this utility model includes a signal processing unit 2, an AC power supply unit 3, and a flame detection electrode J1.

[0061] In this embodiment, the gain adjustment unit 201 includes a microprocessor 211, which is communicatively connected to the control unit 1 and is used to receive the target gain of the amplifier U1 sent by the control unit 1. One end of the microprocessor 211 is connected to the first input terminal of the amplifier U1, and the other end is connected to the output terminal of the amplifier U1.

[0062] Here, a dedicated microprocessor 211 is provided for the signal processing unit 2. The microprocessor 211 can communicate with the control unit 1 via PWM (Pulse Width Modulation) or serial communication, receiving signal commands from the control unit 1. It then adjusts its own parameters according to the signal commands from the control unit 1, thereby adjusting the amplification factor of the initial detection signal sensed by the flame detection electrode J1. Furthermore, the microprocessor 211 can send its parameters to the control unit 1 in real time via serial port or other communication methods for recording and storage, allowing the control unit 1 to access these parameters in real time to determine the signal detected by the flame signal sensing circuit.

[0063] It should be noted that the microprocessor 211 essentially still has a built-in variable resistor or potentiometer. By adjusting the resistance value of the variable resistor or potentiometer, the amplification factor of the initial detection signal sensed by the flame detection electrode J1 is adjusted. The principle of resistance adjustment is the same as in the above embodiment. The difference from the above embodiment is that the control unit 1 does not need to directly control the resistance adjustment of the potentiometer, but instead sends the parameters to be adjusted to the microprocessor 211, and the microprocessor 211 adjusts its own parameters.

[0064] Therefore, through the adjustable flame signal sensing circuit in any of the above embodiments, the signal fed back to the negative feedback terminal of amplifier U1 can be precisely adjusted. Based on the actual model and application conditions of the combustion equipment, the signal processing unit 2 can adjust the amplification factor of the initial detection signal sensed by the flame detection electrode J1 in a timely manner, effectively adjusting the deviation of the flame detection signal, avoiding the deviation caused by component deviations and operating condition differences in the flame signal processing unit, significantly improving the accuracy of the flame signal sensing circuit, and thus effectively improving the efficiency and safety of the combustion equipment.

[0065] This invention provides a controller for a combustion device, including a control unit 1 and a flame signal sensing circuit with adjustable parameters according to any of the above embodiments.

[0066] This utility model provides another controller for a combustion device. The controller for the combustion device includes a control unit 1 and a flame signal sensing circuit with adjustable parameters and a manually adjustable potentiometer. The controller also includes a controller housing, and the flame signal sensing circuit with adjustable parameters is disposed inside the controller housing. Figure 4 A schematic diagram showing the layout of the controller housing and external component terminals is provided. (Reference) Figure 4 The controller housing has an opening KSRL1. In practical applications, the opening KSRL1 is positioned directly opposite the adjustment section of the manual adjustment potentiometer. Figure 4 The specification also provides an exemplary description of the configuration of the flame detection electrode J1. An example of a controller configured with two flame detection electrodes J1 is shown here. In practical applications, only one flame detection electrode J1 may be configured, or more flame detection electrodes J1 may be configured; this invention does not limit this.

[0067] Here, the opening KSRL1 is positioned directly opposite the adjustment section of the manual potentiometer. When manually adjusting the potentiometer, tools such as screwdrivers can be easily inserted into the controller through the opening KSRL1 on the controller housing to adjust the potentiometer. This allows for adjustment of parameters such as resistance without disassembling the controller, making it convenient and significantly improving the efficiency of parameter adjustment. Furthermore, it effectively avoids damage to components or accidental contact with the potentiometer adjustment section during controller disassembly and assembly, thus significantly improving the parameter accuracy during controller use.

[0068] Based on the above embodiments, this utility model also provides a combustion device, which includes the controller provided in any of the above embodiments. The combustion device also has a display, which is communicatively connected to the control unit of the controller and is used to display the current output value of the flame signal sensing circuit to the control unit in debug mode.

[0069] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0070] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A parameter-adjustable flame-signal sensing circuit, characterized by, Applied to combustion equipment, the circuit includes a signal processing unit (2), an AC power supply unit (3), and a flame detection electrode (J1); The signal processing unit (2) includes a gain adjustment unit (21) and an amplifier (U1); One end of the gain adjustment unit (21) is connected to the first input terminal of the amplifier (U1), and the other end is connected to the output terminal of the amplifier (U1). When the resistance of the gain adjustment unit (21) changes, the amplification factor of the amplifier (U1) for the initial detection signal sensed by the flame detection electrode (J1) changes. The output terminal of the amplifier (U1) is also connected to the control unit (1) of the combustion device, and outputs a flame detection signal to the control unit (1). The first input terminal of the amplifier (U1) is also connected to the flame detection electrode (J1), and the second input terminal of the amplifier (U1) is also grounded. One end of the AC power supply unit (3) is grounded, and the other end is connected to the first input terminal of the amplifier (U1) and the flame detection electrode (J1).

2. The circuit of claim 1, wherein, The circuit also includes: The first resistor (R1) has one end connected to the flame detection electrode (J1) and the other end connected to both the AC power supply unit (3) and the signal processing unit (2).

3. The circuit of claim 1, wherein, The signal processing unit (2) further includes: The first capacitor (C1) has one end grounded and the other end connected to the first input terminal of the amplifier (U1); The second resistor (R2) has one end connected to the first input terminal of the amplifier (U1) and the other end connected to the first capacitor (C1); The third resistor (R3) has one end connected to both the second resistor (R2) and the first capacitor (C1), and the other end connected to the flame detection electrode (J1).

4. The circuit of claim 1, wherein, The AC power supply unit (3) includes an AC signal source (S1) and a second capacitor (C2); One end of the AC signal source (S1) is grounded, and the other end is connected to the second capacitor (C2); The other end of the second capacitor (C2) is connected to both the flame detection electrode (J1) and the signal processing unit (2).

5. The circuit of any one of claims 1-4, wherein, The gain adjustment unit (21) includes a digital potentiometer (RL1), one end of which is connected to the first input terminal of the amplifier (U1), and the other end is connected to the output terminal of the amplifier (U1).

6. The circuit according to any one of claims 1-4, characterized in that, The gain adjustment unit (21) includes a manual adjustment potentiometer, one end of which is connected to the first input terminal of the amplifier (U1), and the other end is connected to the output terminal of the amplifier (U1).

7. The circuit of any one of claims 1-4, wherein, The gain adjustment unit (21) includes a microprocessor (211), which is communicatively connected to the control unit (1) and is used to receive the target gain of the amplifier (U1) sent by the control unit (1). One end of the microprocessor (211) is connected to the first input terminal of the amplifier (U1), and the other end is connected to the output terminal of the amplifier (U1).

8. A controller of a combustion plant, characterized in that include: Control unit (1); And the flame signal sensing circuit with adjustable parameters according to any one of claims 1-7.

9. A controller of a combustion plant, characterized in that include: Control unit (1); The adjustable flame signal sensing circuit according to claim 6; The controller housing contains the adjustable flame signal sensing circuit. The controller housing has an opening (KSRL1) that is directly opposite the adjustment section of the manual adjustment potentiometer.

10. A combustion apparatus characterized by comprising: include: The controller as described in claim 8 or 9; The display is communicatively connected to the control unit (1) of the controller and is used to display the current output value of the flame signal sensing circuit to the control unit (1) in debug mode.

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