Gas wall-hanging stove controller circuit

Abstract

The utility model discloses a wall-mounted gas boiler controller circuit, which relates to the technical field of wall-mounted gas boiler control technology, and comprises a main control circuit, a step-down circuit and a combustion control circuit, the step-down circuit carries out step-down on the direct current output by the rectifying circuit, the combustion control circuit comprises a step-up ignition circuit, and the power supply end of the step-up ignition circuit is connected with the output end of the step-down circuit and carries out step-up on the voltage output by the step-down circuit. According to the embodiment of the utility model, after input high-voltage alternating current is reduced into low-voltage direct current through the step-down circuit, low voltage is boosted into high voltage through the boost ignition circuit for ignition, the influence of fluctuation of alternating current of a main power supply is avoided, and the boost ignition circuit is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of wall-mounted boiler control, and particularly relates to a gas wall-mounted boiler controller circuit. Background Art

[0002] A gas wall-mounted boiler is a device that uses water as a heat transfer medium and provides household heating and domestic hot water by burning gas. This system includes a combustion system, a heat exchange system, a water circuit power and safety system, an electric control system, and other components. Among them, the ignition control circuit is an indispensable part of the wall-mounted boiler control system, and it is responsible for igniting the system.

[0003] For most traditional boost ignition circuits, the power supply is directly provided by the system's AC main power supply. The fluctuation of the alternating current will affect the ignition frequency, resulting in system instability. It is necessary to design a gas wall-mounted boiler controller circuit to solve the ignition problem of the gas wall-mounted boiler. Summary of the Utility Model

[0004] In order to solve the problem that the power supply of the boost ignition circuit is directly provided by the system's AC main power supply, and the high and low of the alternating current will affect the ignition frequency, resulting in system instability, the utility model designs a gas wall-mounted boiler controller circuit to solve the ignition problem of the gas wall-mounted boiler.

[0005] The utility model is implemented by the following scheme: A gas wall-mounted boiler controller circuit includes a main control circuit, a buck circuit, and a combustion control circuit. The buck circuit includes a rectifying circuit for rectifying alternating current into direct current. The buck circuit steps down the direct current output by the rectifying circuit. The combustion control circuit includes a boost ignition circuit, and the power supply end of the boost ignition circuit is connected to the output end of the buck circuit and steps up the voltage output by the buck circuit.

[0006] For the gas wall-mounted boiler control circuit as described above, the boost ignition circuit includes a first triode, a second triode, transformer T2, and transformer T3. The collector of the first triode is connected to the first end of the first primary coil of transformer T2. The second end of the first primary coil is connected to the base of the second triode. The collector of the second triode is connected to the second end of the second primary coil, and the emitter is connected to the second end of the secondary coil of transformer T2. The first end of the secondary coil of transformer T2 is connected to the first end of the primary coil of transformer T3 through diode D12 and capacitor C30.

[0007] For the gas wall-mounted boiler control circuit as described above, the flame detection circuit includes a flame detection needle for detecting flame. The flame detection circuit is connected to the first end of the secondary coil of transformer T2 of the boost ignition circuit.

[0008] The gas wall-mounted boiler control circuit as described above, the step-down circuit includes a first-stage step-down circuit and a second-stage step-down circuit. The first-stage step-down circuit includes a main power supply, a common-mode inductor L2, a PWM conversion chip IC1, and a transformer T1. The main power supply is connected to the common-mode inductor L12 with a fuse F1, a non-linear resistor, and a capacitor C5. The output end of the common-mode inductor is connected to a rectifier circuit, and the output end of the rectifier circuit is connected to the first primary coil of the transformer T1. The first primary coil of the transformer T1 is connected in parallel with a resistor R6 and a diode D7. The PWM conversion chip IC1 is connected to the first primary coil of the transformer T1. The second primary coil of the transformer T1 is connected to the VDD terminal of the PWM conversion chip IC1. The secondary coil of the transformer T1 realizes the output of the power supply through a diode D8.

[0009] The gas wall-mounted boiler control circuit as described above, the second-stage step-down circuit includes a buck DC-DC converter. The ON / OFF terminal and the GND terminal of the buck DC-DC converter are connected in series and connected to the ground terminal. The output end of the buck DC-DC converter is connected to an inductor L1. The first end of the inductor L1 is connected to a diode D18. The second end of the inductor L1 is connected to a resistor R1, an electrolytic capacitor E4, and a capacitor C6.

[0010] The gas wall-mounted boiler control circuit as described above, the first-stage step-down circuit includes a step-down feedback circuit. The feedback circuit includes an optocoupler IC2 connected to the COM port of the PWM conversion chip IC1. The input end of the optocoupler is connected to the output end of the transformer.

[0011] The gas wall-mounted boiler control circuit as described above includes a valve control circuit including a proportional valve control circuit, a first switching valve control circuit, and a second switching valve circuit. The valve control circuit includes a proportional valve opening circuit and a proportional valve closing circuit;

[0012] The proportional valve opening circuit includes a third triode and a fourth triode. The base of the third triode is connected to the base of the third triode in the main control circuit. A capacitor C33 is connected between the base and the emitter of the third triode and is connected to the ground terminal. The collector of the third triode is connected to the base of the fourth triode. A resistor R76 is connected between the base and the emitter of the fourth triode and is connected to the power supply. The collector of the fourth triode is connected to the terminal block CN12;

[0013] The proportional valve closing circuit includes a capacitor C34, a resistor RJ1, and a resistor R32. The capacitor C34 and the resistor RJ1 are connected to the ground terminal. The second end of the resistor R32 is connected to the wiring terminal block CN1.

[0014] The gas wall-mounted boiler control circuit as described above, the main control circuit is connected to a data acquisition circuit.

[0015] The gas wall-mounted boiler control circuit as described above, wherein the main control circuit is connected with a display control circuit for displaying system status information.

[0016] The gas wall-mounted boiler control circuit as described above, wherein the main control circuit is further connected with a water pump control circuit and a fan control circuit.

[0017] Compared with the prior art, the beneficial effects of this technical solution are as follows:

[0018] In the embodiment of the present utility model, after the input high-voltage alternating current is stepped down to low-voltage direct current by a step-down circuit, the low voltage is then stepped up to high voltage by a step-up ignition circuit for ignition, which is not affected by the fluctuation of the main power alternating current, and the step-up ignition circuit is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0020] Figure 1 is the circuit principle block diagram of the present utility model;

[0021] Figure 2 is the main control circuit diagram of the present utility model;

[0022] Figure 3 is the combustion control circuit diagram of the present utility model;

[0023] Figure 4 is the step-down circuit diagram of the present utility model;

[0024] Figure 5 is the valve control circuit of the present utility model;

[0025] Figure 6 is the data acquisition circuit diagram of the present utility model;

[0026] Figure 7 is the display control circuit diagram of the present utility model;

[0027] Figure 8 is the output control circuit diagram of the present utility model; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] Reference Figures 1 - 8 Shown is a gas wall-mounted boiler controller circuit, including a main control circuit 1, a step-down circuit 3, and a combustion control circuit 2. The step-down circuit 3 includes a rectification circuit 312 for rectifying alternating current into direct current. The step-down circuit 3 steps down the direct current output by the rectification circuit 312. The combustion control circuit 2 includes a boost ignition circuit 201. The power supply end of the boost ignition circuit 201 is connected to the output end of the step-down circuit 3 and boosts the voltage output by the step-down circuit 3. In the embodiment of the present utility model, after the input high-voltage alternating current is stepped down to low-voltage direct current by the step-down circuit 3, the low voltage is boosted to high voltage by the boost ignition circuit 201 for ignition, without being affected by the fluctuation of the main power alternating current, and the boost ignition circuit is more stable.

[0030] Further, the boost ignition circuit 201 includes a first triode, a second triode, a transformer T2, and a transformer T3. The collector of the first triode is connected to the first end of the first primary coil of the transformer T2. The second end of the first primary coil is connected to the base of the second triode. The collector of the second triode is connected to the second end of the second primary coil, and the emitter is connected to the second end of the secondary coil of the transformer T2. The first end of the secondary coil of the transformer T2 is connected to the first end of the primary coil of the transformer T3 through a diode D12 and a capacitor C30. The specific current flow direction of the boost ignition circuit 201 is as follows: Preferably, after the step-down circuit 3 steps down the voltage twice, the 220V voltage is reduced to 5V and connected to the emitter of the first triode of the boost ignition circuit. When the base of the first triode is at a low level, the first triode conducts, and the current will enter from the first primary coil of the transformer T2. After the voltage is boosted by the transformer T2, it is output from the secondary coil of the transformer T2. Both the first triode and the second triode act as switches in the circuit. When the base-collector input of the second triode is at a high voltage, the second triode conducts, and the current flows in from the first end of the second secondary coil, flows out from the second end, and forms a loop through the ground terminal. At this time, the magnetic flux of the transformer T2 increases, causing the voltage of the secondary coil to rise, thus achieving the purpose of boosting. After being regulated by the capacitor D12 and the zener diode ZD1, it is input to the transformer T3 to further increase the voltage for ignition. The output end of the first secondary coil of the transformer T2 is connected to the negative electrode of the zener diode ZD1. The positive electrode of the zener diode is connected to the negative electrode of the diode MCR1. The positive electrode of the diode MCR1 is connected to the first end of the primary coil of the transformer T3. A capacitor C31 is also connected in parallel between the zener diode ZD1 and the diode MCR1. A diode D13 is connected in series between the first end and the second end of the primary coil of the transformer T3. A resistor R69 is connected in parallel with the diode D13.

[0031] The flame detection circuit 202 in this embodiment realizes precise detection of the flame. The flame detection circuit 202 includes a flame detection needle for detecting the flame. The flame detection circuit 202 is connected to the first end of the secondary coil of the transformer T2 of the boost ignition circuit 201. Preferably, the detection sensor in this flame detection circuit 202 uses an ion flame sensor, which has higher reliability and anti-interference ability and higher detection sensitivity. A plurality of resistors are connected in series on the main circuit of the flame detection circuit 202, and its branch is connected to a 5V power supply. The 5V power supply is connected to the negative electrode of the diode D31B. The positive electrode of the diode D31B is connected to the main circuit of the flame detection circuit 202. A resistor R56 is connected in parallel with the diode D31B. Another branch of the flame detection circuit 202 is also connected to a ground terminal. The ground terminal is connected to a capacitor C26. The other end of the capacitor C26 is connected to the main circuit of the flame detection circuit 202. The diodes D31A and C27 are respectively connected in parallel with the diode C26.

[0032] In this embodiment, in order to achieve the matching of different voltages in the system, the buck circuit 3 can step down the 220V voltage to 24V. The buck circuit 3 includes a first-stage buck circuit 31. The first-stage buck circuit 31 includes a main power supply, a common-mode inductor L2, a PWM conversion chip IC1, and a transformer T1. The main power supply is connected to the common-mode inductor L12 with a fuse F1, a non-linear resistor, and a capacitor C5. The output end of the common-mode inductor is connected to a rectifier circuit 312 for converting alternating current into direct current. The second end of the rectifier circuit 312 is connected to the first primary coil of the transformer T1. A resistor R6 and a diode D7 are connected in parallel to the first primary coil of the transformer T1. The PWM conversion chip IC1 is connected to the first primary coil of the transformer T1. The second primary coil of the transformer T1 is connected to the VDD terminal of the PWM conversion chip IC1. The secondary coil of the transformer T1 outputs power through a diode D8. The 220V main power supply is filtered by the common-mode inductor L2 to reduce high-frequency common-mode noise, and then input to the rectifier circuit 312 to rectify the alternating current into direct current, which are respectively input into the transformer T1 and the PWM conversion chip IC1. After entering the transformer T1, the voltage is stepped down, and the 220V voltage is stepped down to 24V. In this embodiment, the rectifier circuit is a rectifier bridge with the model number DB107.

[0033] Further, in order to reduce the power supply to 5V, the second-stage buck circuit 32 includes a buck DC-DC converter. The ON / OFF terminal and the GND terminal of the buck DC-DC converter are connected in series and connected to the ground terminal. The output terminal of the buck DC-DC converter is connected to an inductor L1. The first end of the inductor L1 is connected to a diode D18. The second end of the inductor L1 is connected to a resistor R1, an electrolytic capacitor E4, and a capacitor C6. Since the buck CD-DC converter can step down the voltage, the buck DC-DC converter steps down the 24V voltage output by the first-stage buck circuit 31 to 5V.

[0034] Further, in order to enable feedback of the buck circuit, the first-stage buck circuit 31 includes a buck feedback circuit 311. The feedback circuit includes an optocoupler IC2 connected to the COM port of the PWM conversion chip IC1. The input end of the optocoupler IC2 is connected to the output end of the transformer. The COM of the PWM conversion chip IC1 is the chip feedback port. Just input the voltage output by the first-stage buck circuit into the COM port of the PWM conversion chip IC1, and the function of the chip can be used to achieve voltage feedback. The first input end of the optocoupler IC2 is connected to a resistor R12. The second input end of the optocoupler IC2 is connected to resistors R40, R75, R13, a capacitor C13, and a zener diode Ref-1.

[0035] In this embodiment, in order to make the combustion efficiency of the gas furnace higher, the gas wall-mounted boiler is provided with a valve control circuit 4 including a proportional valve control circuit, a first switch valve control circuit and a second switch valve circuit. The valve control circuit includes a proportional valve opening circuit and a proportional valve closing circuit.

[0036] The proportional valve opening circuit includes a third triode and a fourth triode. The base of the third triode is connected to the main control circuit 1. A capacitor C33 is connected between the base and the emitter of the third triode and is connected to the ground terminal. The collector of the third triode is connected to the base of the fourth triode. A resistor R76 is connected between the base and the emitter of the fourth triode and is connected to the power supply. The collector of the fourth triode is connected to the terminal block CN12.

[0037] The proportional valve closing circuit includes a capacitor C34, a resistor RJ1 and a resistor R32. The capacitor C34 and the resistor RJ1 are connected to the ground terminal. The second end of the resistor R32 is connected to the wiring terminal block CN1. The proportional valve can accurately control the ratio of gas to air, effectively improve the combustion efficiency of the gas wall-mounted boiler, and save energy and protect the environment.

[0038] Further, in order to enable the gas wall-mounted boiler to perform automatic adjustment and control, the main control circuit 1 is connected to a data acquisition circuit 5. The data acquisition circuit 5 includes a bathroom probe, a heating probe, an anti-dry burning device, a water flow sensor, a wind pressure sensor, a water pressure switch, and a room temperature controller. The sensors collect information and then transmit the collected information to the main control point circuit 1 for processing, and adjust the environment according to the obtained data information.

[0039] In this embodiment, in order to make the information of the system more intuitively displayed, the main control circuit 1 is connected to a display control circuit 6 for displaying the system status information.

[0040] Further, in order to realize the water intake of the gas wall-mounted boiler and the functions of the fan, etc., the main control circuit 1 is also connected to a water pump control circuit 7 and a fan control circuit 8.

[0041] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A gas wall-mounted boiler controller circuit, characterized in that, It includes a main control circuit (1), a step-down circuit (3) and a combustion control circuit (2). The step-down circuit (3) includes a rectifying circuit (312) for rectifying alternating current into direct current. The step-down circuit (3) steps down the direct current output by the rectifying circuit (312). The combustion control circuit (2) includes a boost ignition circuit (201). The power supply terminal of the boost ignition circuit (201) is connected to the output terminal of the step-down circuit (3) and boosts the voltage output by the step-down circuit (3).

2. The gas wall-mounted boiler controller circuit according to claim 1, characterized in that, The boost ignition circuit (201) includes a first triode, a second triode, a transformer T2 and a transformer T3. The collector of the first triode is connected to the first end of the first primary coil of the transformer T2. The second end of the first primary coil is connected to the base of the second triode. The collector of the second triode is connected to the second end of the second primary coil, and the emitter is connected to the second end of the secondary coil of the transformer T2. The first end of the secondary coil of the transformer T2 is connected to the first end of the primary coil of the transformer T3 through a diode D12 and a capacitor C30.

3. The gas wall-mounted boiler controller circuit according to claim 2, wherein It includes a flame detection circuit (202) including a flame detection needle for detecting a flame. The flame detection circuit (202) is connected to the first end of the secondary coil of the transformer T2 of the boost ignition circuit (201).

4. The gas wall-mounted boiler controller circuit according to claim 1, characterized in that The step-down circuit (3) includes a first-stage step-down circuit (31) and a second-stage step-down circuit (32). The first-stage step-down circuit (31) includes a main power supply, a common-mode inductor L2, a PWN conversion chip IC1 and a transformer T1. The main power supply is connected to the common-mode inductor L12 with a fuse F1, a non-linear resistor and a capacitor C5. The output terminal of the common-mode inductor is connected to the rectifying circuit (312). The output terminal of the rectifying circuit (312) is connected to the first primary coil of the transformer T1. The first primary coil of the transformer T1 is connected in parallel with a resistor R6 and a diode D7. The PWN conversion chip IC1 is connected to the first primary coil of the transformer T1. The second primary coil of the transformer T1 is connected to the VDD terminal of the PWN conversion chip IC1. The secondary coil of the transformer T1 outputs power through a diode D8.

5. The gas wall-mounted boiler controller circuit according to claim 4, characterized in that, The second-stage step-down circuit (32) includes a buck DC-DC converter. The ON / OFF terminal and the GND terminal of the buck DC-DC converter are connected in series and connected to the ground terminal. The output terminal of the buck DC-DC converter is connected to an inductor L1. The first end of the inductor L1 is connected to a diode D18. The second end of the inductor L1 is connected to a resistor R1, an electrolytic capacitor E4 and a capacitor C6.

6. The gas wall-mounted boiler controller circuit according to claim 5, wherein The first-stage step-down circuit (31) includes a step-down feedback circuit (311). The feedback circuit includes an optocoupler IC2 connected to the COM port of the PWN conversion chip IC1. The input terminal of the optocoupler IC2 is connected to the output terminal of the transformer.

7. The gas wall-mounted boiler controller circuit according to claim 1, characterized in that, It includes a valve control circuit (4) including a proportional valve control circuit, a first on-off valve control circuit and a second on-off valve circuit. The valve control circuit includes a proportional valve opening circuit and a proportional valve closing circuit; The proportional valve opening circuit includes a third triode and a fourth triode. The base of the third triode is connected to the main control circuit (1). A capacitor C33 is connected between the base and the emitter of the third triode and is connected to the ground terminal. The collector of the third triode is connected to the base of the fourth triode. A resistor R76 is connected between the base and the emitter of the fourth triode and is connected to the power supply. The collector of the fourth triode is connected to the terminal block CN12. The proportional valve closing circuit includes a capacitor C34, a resistor RJ1, and a resistor R32. The capacitor C34 and the resistor RJ1 are connected to the ground terminal. The second end of the resistor R32 is connected to the wiring terminal block CN1.

8. The gas wall-mounted boiler controller circuit according to claim 2, characterized in that, The main control circuit (1) is connected to a data acquisition circuit (5).

9. The gas wall-mounted boiler controller circuit according to claim 1, characterized in that The main control circuit (1) is connected to a display control circuit (6) for displaying system status information.

10. The gas wall-mounted boiler controller circuit according to claim 2, characterized in that, The main control circuit is also connected to a water pump control circuit (7) and a fan control circuit (8).

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