Boiler fan and domestic hot water simulation device and control method

Abstract

The invention discloses a boiler fan and domestic hot water simulation device and a control method. Comprising a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage frequency conversion circuit, a domestic hot water precision voltage frequency conversion circuit, a trigger circuit, a fan rotation speed feedback circuit and a domestic hot water flow feedback circuit. The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage frequency conversion circuit, the domestic hot water control operational amplifier circuit and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan rotating speed feedback circuit is electrically connected with the trigger circuit. According to the boiler fan and domestic hot water simulation device and the control method, through cooperative arrangement of all the modules, the state of boiler domestic hot water is simulated, a real fan does not need to be adopted for testing, the working efficiency is improved, noise is reduced, and waste gas is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a boiler fan and domestic hot water simulation device and a control method. Background Art

[0002] Without a complete set of structural parts and supporting hydraulic and gas systems, the boiler control system cannot be started and operated normally, especially when testing the performance of the fan. The actual fan is large and heavy, and the test is more laborious. Moreover, when no noise reduction treatment is performed, the actual fan noise is very loud. When the furnace is actually burning, the fan will discharge exhaust gas. If not handled properly, the exhaust gas will affect human health.

[0003] Based on the above situation, the present invention proposes a boiler fan and domestic hot water simulation device and a control method, which can effectively solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a boiler fan and domestic hot water simulation device and control method. The boiler fan and domestic hot water simulation device and control method of the present invention can simulate the state of boiler domestic hot water through the coordinated setting of various modules, without the need to use a physical fan for testing, thereby improving work efficiency, reducing noise, and avoiding the generation of exhaust gas.

[0005] The present invention is achieved through the following technical solutions:

[0006] A boiler fan and domestic hot water simulation device, comprising a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit and a domestic hot water flow feedback circuit;

[0007] The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit, and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected to the trigger circuit;

[0008] The step-down circuit is used to reduce the voltage value.

[0009] The fan PWM control operational amplifier circuit is used to amplify the PWM signal given by the controller and then transmit it to the fan precision voltage-frequency conversion circuit to be able to identify a variable voltage signal.

[0010] The fan precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the fan PWM control operational amplifier circuit into a corresponding frequency signal.

[0011] The trigger circuit is used to automatically execute the output when the received frequency signal meets the trigger condition, and give the subsequent feedback circuit an opening and closing signal of the corresponding frequency.

[0012] The domestic hot water control amplifier circuit is used to amplify the pulse signal given by the controller and then transmit it to the domestic hot water precision voltage-frequency conversion circuit to generate a variable voltage signal that can be recognized.

[0013] The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the domestic hot water control amplifier circuit into a corresponding frequency signal.

[0014] The domestic hot water flow feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of the entire domestic hot water flow.

[0015] The fan speed feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of whether the entire fan is running at the expected speed.

[0016] The object of the present invention is to provide a boiler fan and domestic hot water simulation device and control method. The boiler fan and domestic hot water simulation device and control method of the present invention can simulate the state of boiler domestic hot water through the coordinated setting of various modules, without the need to use a physical fan for testing, thereby improving work efficiency, reducing noise, and avoiding the generation of exhaust gas.

[0017] Preferably, the step-down circuit includes a low voltage difference linear regulator IC1, a first connector J1, a PMOS tube Q1, a diode D1, a first Schottky diode D2, a second Schottky diode D3, an electrolytic capacitor CE1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, and a thirty-fourth resistor R34;

[0018] The VIN pin of the first connector J1 is electrically connected to the D pole of the PMOS tube Q1, and the S pole of the PMOS tube Q1 is electrically connected to the cathode of the diode D1, the 2nd pin of the first Schottky diode D2, the VCC pin and the CTL pin of the low voltage drop linear regulator IC1, one end of the first capacitor C1, and the positive pole of the electrolytic capacitor CE1, and the cathode of the electrolytic capacitor CE1 is electrically connected to the other end of the first capacitor C1, one end of the third capacitor C3, the GND pin of the low voltage drop linear regulator IC1, one end of the second capacitor C2, one end of the first resistor R1, one end of the third resistor R3, and the GND pin of the second capacitor C3. Pin 2 of the Schottky diode D3 is electrically connected, the other end of the first resistor R1 is electrically connected to the G pole of the PMOS tube Q1 and the positive pole of the diode D1 respectively, the other end of the second capacitor C2 is electrically connected to pin 1 of the first Schottky diode D2, the VOUT pin of the low-voltage difference linear regulator IC1, the 3rd pin of the second Schottky diode D3, and the thirty-fourth resistor R34 respectively, the other end of the third capacitor C3 is electrically connected to one end of the second resistor R2 and pin 1 of the second Schottky diode D3 respectively, and the other end of the second resistor R2 is electrically connected to the other end of the third resistor R3.

[0019] Preferably, the fan PWM control operational amplifier circuit includes a first operational amplifier U2A, a third operational amplifier U2C, a fourth operational amplifier U2D, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10;

[0020] The step-down circuit is electrically connected to one end of the fourth capacitor C4, one end of the fourth resistor R4, and pin 3 of the first operational amplifier U2A, respectively; the other end of the fourth capacitor C4 is electrically connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, and pin 2 of the first operational amplifier U2A, respectively; the other end of the fifth resistor R5 is electrically connected to pin 4 of the first operational amplifier U2A and one end of the fifth capacitor C5, respectively; pin 11 of the first operational amplifier U2A is electrically connected to the other end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the eighth resistor R8, respectively; the other end of the sixth capacitor C6 is electrically connected to one end of the seventh resistor R7, respectively; Pin 12 of the fourth operational amplifier U2D is electrically connected, the other end of the seventh resistor R7 is electrically connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is electrically connected to pin 1 of the first operational amplifier U2A, the other end of the eighth resistor R8 is electrically connected to pin 10 of the third operational amplifier U2C and one end of the ninth resistor R9, the other end of the ninth resistor R9 is electrically connected to pins 13 and 14 of the fourth operational amplifier U2D, pin 9 of the third operational amplifier U2C is electrically connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is electrically connected to pin 8 of the third operational amplifier U2C.

[0021] Preferably, the wind turbine precision voltage-frequency conversion circuit includes a first voltage-frequency converter U2, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20;

[0022] The fan PWM control operational amplifier circuit is electrically connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is respectively electrically connected to the seventh capacitor C7 and the COMP IN pin of the first voltage-frequency converter U2, the REF I pin of the first voltage-frequency converter U2 is electrically connected to the eleventh resistor R11, the THR pin of the first voltage-frequency converter U2 is respectively electrically connected to the IOUT pin of the first voltage-frequency converter U2, one end of the thirteenth resistor R13, and one end of the tenth capacitor C10, the other end of the thirteenth resistor R13 is respectively electrically connected to the other end of the tenth capacitor C10, one end of the sixteenth resistor R16, and one end of the eighteenth resistor R18, the other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17, and the FREQ pin of the first voltage-frequency converter U2 The OUT pin is electrically connected to one end of the nineteenth resistor R19 and one end of the twentieth resistor R20 respectively, the RC pin of the first voltage-frequency converter U2 is electrically connected to one end of the ninth capacitor C9 and one end of the fourteenth resistor R14 respectively, the other end of the fourteenth resistor R14 is electrically connected to one end of the fifteenth resistor R15, the other end of the ninth capacitor C9 is electrically connected to the GND pin of the first voltage-frequency converter U2 and one end of the eighth capacitor C8 respectively, the other end of the eighth capacitor C8 is electrically connected to the VS pin of the first voltage-frequency converter U2, and the trigger circuit is electrically connected to the other end of the eighth capacitor C8, the other end of the fifteenth resistor R15, the other end of the seventeenth resistor R17, and the other end of the twentieth resistor R20 respectively.

[0023] Preferably, the trigger circuit includes a trigger U1, an eleventh capacitor C11, a twenty-first resistor R21, and a twenty-second resistor R22;

[0024] The fan precision voltage-frequency conversion circuit is electrically connected to the VCC pin of the trigger, the other end of the twenty-first resistor R21, the CLOCK2 pin of the trigger, and the other end of the twenty-second resistor R22, respectively; the VCC pin of the trigger is electrically connected to one end of the eleventh capacitor C11; the RESET2 pin of the trigger is electrically connected to one end of the twenty-first resistor R21 and the SET2 pin of the trigger, respectively; the DATA2 pin of the trigger is electrically connected to the Q2# pin of the trigger; the Q2 pin of the trigger is electrically connected to the fan speed feedback circuit; one end of the twenty-second resistor R22 of the trigger is electrically connected to the RESET1 pin of the trigger and one end of the SET1 pin of the trigger, respectively; the DATA1 pin of the trigger is electrically connected to the Q1# pin of the trigger; the CLOCK1 pin of the trigger is electrically connected to the domestic hot water precision voltage-frequency conversion circuit; and the Q1 pin of the trigger is electrically connected to the domestic hot water flow feedback circuit.

[0025] Preferably, the domestic hot water precision voltage-frequency conversion circuit includes a second voltage-frequency converter U3, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, and a thirty-first resistor R31;

[0026] The REF I pin of the second voltage-frequency converter U3 is electrically connected to one end of the thirty-first resistor R31, the other end of the thirty-first resistor R31 is electrically connected to one end of the thirtieth resistor R30, the other end of the thirtieth resistor R30 is electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13, respectively, the THR pin of the second voltage-frequency converter U3 is electrically connected to the other end of the twenty-ninth resistor R29, the other end of the thirteenth capacitor C13, and the IOUT pin of the second voltage-frequency converter U3, respectively, and the COMP pin of the second voltage-frequency converter U3 is electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13, respectively. The IN pin is electrically connected to the domestic hot water control operational amplifier circuit, the VS pin of the second voltage-frequency converter U3 is electrically connected to one end of the fourteenth capacitor C14, the other end of the fourteenth capacitor C14 is respectively electrically connected to the domestic hot water control operational amplifier circuit, the GND pin of the second voltage-frequency converter U3, and one end of the twelfth capacitor C12, the RC pin of the second voltage-frequency converter U3 is respectively electrically connected to the other end of the twelfth capacitor C12 and one end of the twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is electrically connected to one end of the twenty-third resistor R23, the other end of the twenty-third resistor R23 is respectively electrically connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27, the trigger circuit, and the fan precision voltage-frequency conversion circuit, the other end of the twenty-seventh resistor R27 is electrically connected to the other end of the twenty-eighth resistor R28, the other end of the twenty-fourth resistor R24 ​​is respectively electrically connected to one end of the twenty-fifth resistor R25 and the FREQ OUT pin of the second voltage-frequency converter U3, and the other end of the twenty-fifth resistor R25 is electrically connected to the trigger circuit.

[0027] Preferably, the domestic hot water control operational amplifier circuit includes a second operational amplifier U2B, a fifteenth capacitor C15, a thirty-second resistor R32, a thirty-third resistor R33, and a first jumper J11;

[0028] Pin 7 of the second operational amplifier U2B is electrically connected to pin 6 of the second operational amplifier U2B and one end of the thirty-second resistor R32, respectively; the other end of the thirty-second resistor R32 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit and one end of the fifteenth capacitor C15, respectively; the other end of the fifteenth capacitor C15 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit, one end of the first jumper J11, and the domestic hot water flow feedback circuit, respectively; the other end of the first jumper J11 is electrically connected to one end of the thirty-third resistor R33, and the other end of the thirty-third resistor R33 is electrically connected to pin 5 of the second operational amplifier U2B.

[0029] Preferably, the domestic hot water flow feedback circuit includes a second connector J2, a second NPN transistor Q2, a sixteenth capacitor C16, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, and a second jumper J13;

[0030] The DHWTACHO pin of the second connector J2 is electrically connected to one end of the second jumper J13 and the collector of the second NPN transistor Q2, respectively; the other end of the second jumper J13 is electrically connected to one end of the thirty-seventh resistor R37, the other end of the thirty-seventh resistor R37 is electrically connected to one end of the sixteenth capacitor C16, the other end of the sixteenth capacitor C16 is electrically connected to the emitter of the second NPN transistor Q2, one end of the thirty-sixth resistor R36, and the domestic hot water control operational amplifier circuit, the other end of the thirty-sixth resistor R36 is electrically connected to one end of the thirty-fifth resistor R35 and the base of the second NPN transistor Q2, and the other end of the thirty-fifth resistor R35 is electrically connected to the trigger circuit.

[0031] Preferably, the fan speed feedback circuit includes a first NPN transistor Q1, a seventeenth capacitor C17, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, and a third jumper J15;

[0032] The base of the first NPN transistor Q1 is electrically connected to one end of the thirty-eighth resistor R38 and one end of the thirty-ninth resistor R39 respectively, the other end of the thirty-eighth resistor R38 is electrically connected to the trigger circuit, the other end of the thirty-ninth resistor R39 is electrically connected to the emitter of the first NPN transistor Q1 and one end of the seventeenth capacitor C17 respectively, the other end of the seventeenth capacitor C17 is electrically connected to one end of the fortieth resistor R40, the other end of the fortieth resistor R40 is electrically connected to one end of the third jumper J15, and the other end of the third jumper J15 is connected to the collector of the first NPN transistor Q1.

[0033] According to another aspect of the present invention, a control method for a boiler fan and a domestic hot water simulation device is provided, comprising the following steps:

[0034] Step S1: Connect the control line of the boiler PWM fan to the terminal of the first connector J1;

[0035] Step S2: Turn on the PCB power supply of the furnace, and the control unit of the boiler inputs a 24V voltage to the Vin and GND ends of the analog board. The analog board stabilizes the 24V voltage to 5V through the step-down circuit, and supplies it to the power supply pins of each integrated IC of the analog board to ensure the normal operation of the chip;

[0036] Step S3: When the boiler enters different stages, the fan speed set internally is transmitted to the internal processing unit of the analog board through the PWM interface of the first connector J1 terminal, and the transmitted signal is amplified by the operational amplifier U2;

[0037] Step S4: transmitting the amplified signal to the first voltage-frequency converter U2 to convert the voltage into frequency;

[0038] Step S5: The corresponding frequency passes through the trigger U1, and by controlling the turn-off of the first NPN transistor Q1, the signal feedback signal is transmitted to the PCB control unit of the boiler through the TACHO pin of the first connector J1. The control unit of the boiler receives the signal of the TACHO pin and performs the corresponding next step instruction;

[0039] Step S6: Connect the control line of the boiler domestic hot water to the corresponding terminal of the second connector J2;

[0040] Step S7: The control unit of the boiler provides a 5V power supply, which is connected to the CCW pin and the GND pin of the second connector J2;

[0041] Step S8: applying a variable voltage signal to the WLPER pin of the second connector J2, and amplifying the input signal through the operational amplifier U2;

[0042] Step S9: transmitting the amplified signal to the second voltage-frequency converter U3 to convert the voltage into frequency;

[0043] Step S10: The corresponding frequency passes through the trigger U1, and by controlling the turn-off of the second NPN transistor Q2, the signal feedback signal is transmitted to the PCB control unit of the boiler through the DHWTACHO pin of the second connector J2. The control unit of the boiler starts the instruction of the domestic hot water mode of the boiler by receiving the signal of the DHWTACHO pin;

[0044] Step S11: By closing the input of the WLPER pin signal of the second connector J2, the furnace is turned off in the domestic hot water mode when simulating no water flow;

[0045] Step S12: Steps 6 to 11 may be repeated to confirm the working status of the boiler under different water flow rates.

[0046] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0047] The boiler fan and domestic hot water simulation device and control method of the present invention achieve simulation of the state of boiler domestic hot water through the coordinated setting of various modules, without the need to use a physical fan for testing, thereby improving work efficiency, reducing noise, and avoiding the generation of exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a circuit block diagram of the present invention;

[0049] Figure 2 It is the circuit principle diagram of the present invention;

[0050] Figure 3 is a circuit schematic diagram of the voltage-reducing circuit of the present invention;

[0051] Figure 4 This is a circuit schematic diagram of the fan PWM control operational amplifier circuit of the present invention;

[0052] Figure 5 This is a circuit schematic diagram of the fan precision voltage-frequency conversion circuit of the present invention;

[0053] Figure 6 A circuit schematic diagram of the trigger circuit of the present invention;

[0054] Figure 7 This is a circuit schematic diagram of the domestic hot water precision voltage-frequency conversion circuit of the present invention;

[0055] Figure 8 The circuit schematic diagram of the domestic hot water control operational amplifier circuit of the present invention;

[0056] Fig. 9 It is a circuit principle diagram of the domestic hot water flow feedback circuit of the present invention;

[0057] Fig.10 It is a circuit principle diagram of the fan speed feedback circuit of the present invention;

[0058] Fig.11 is a circuit schematic diagram of the first connector J1 of the present invention;

[0059] Fig.12 FIG. 4 is a circuit schematic diagram of the first connector J2 of the present invention. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0061] Embodiment 1:

[0062] like Figures 1 to 12 As shown, the present invention provides a boiler fan and domestic hot water simulation device, including a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit, and a domestic hot water flow feedback circuit;

[0063] The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit, and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected to the trigger circuit;

[0064] The step-down circuit is used to reduce the voltage value.

[0065] The fan PWM control operational amplifier circuit is used to amplify the PWM signal given by the controller and then transmit it to the fan precision voltage-frequency conversion circuit to be able to identify a variable voltage signal.

[0066] The fan precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the fan PWM control operational amplifier circuit into a corresponding frequency signal.

[0067] The trigger circuit is used to automatically execute the output when the received frequency signal meets the trigger condition, and give the subsequent feedback circuit an opening and closing signal of the corresponding frequency.

[0068] The domestic hot water control amplifier circuit is used to amplify the pulse signal given by the controller and then transmit it to the domestic hot water precision voltage-frequency conversion circuit to generate a variable voltage signal that can be recognized.

[0069] The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the domestic hot water control amplifier circuit into a corresponding frequency signal.

[0070] The domestic hot water flow feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of the entire domestic hot water flow.

[0071] The fan speed feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of whether the entire fan is running at the expected speed.

[0072] Embodiment 2:

[0073] like Figures 1 to 12As shown, the present invention provides a boiler fan and domestic hot water simulation device, including a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit, and a domestic hot water flow feedback circuit;

[0074] The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit, and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected to the trigger circuit;

[0075] The step-down circuit is used to reduce the voltage value.

[0076] The fan PWM control operational amplifier circuit is used to amplify the PWM signal given by the controller and then transmit it to the fan precision voltage-frequency conversion circuit to be able to identify a variable voltage signal.

[0077] The fan precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the fan PWM control operational amplifier circuit into a corresponding frequency signal.

[0078] The trigger circuit is used to automatically execute the output when the received frequency signal meets the trigger condition, and give the subsequent feedback circuit an opening and closing signal of the corresponding frequency.

[0079] The domestic hot water control amplifier circuit is used to amplify the pulse signal given by the controller and then transmit it to the domestic hot water precision voltage-frequency conversion circuit to generate a variable voltage signal that can be recognized.

[0080] The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the domestic hot water control amplifier circuit into a corresponding frequency signal.

[0081] The domestic hot water flow feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of the entire domestic hot water flow.

[0082] The fan speed feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of whether the entire fan is running at the expected speed.

[0083] After the boiler defines the functions to be realized during the project evaluation phase, the fan and hot water system functions of the selected control system can be quickly confirmed, reducing the waiting period for project development;

[0084] The actual fan (PWM) on the boiler is large and heavy, which is inconvenient and unsafe to carry. This PWM fan simulator can realize the speed of the fan under various conditions, which is more energy-saving; there is no need to build a domestic hot water system, saving pipes and installation materials;

[0085] The simulator is small and light, so it can be moved anywhere and does not require actual water supply, which is very convenient.

[0086] The boiler drive circuit detects the parameters of each sensor in real time. The simulation accuracy of the simulator directly affects the operation effect of the machine. The use of precision components is more stable, reliable and has a longer service life.

[0087] The step-down circuit includes a low voltage difference linear regulator IC1, a first connector J1, a PMOS tube Q1, a diode D1, a first Schottky diode D2, a second Schottky diode D3, an electrolytic capacitor CE1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, and a thirty-fourth resistor R34;

[0088] The VIN pin of the first connector J1 is electrically connected to the D pole of the PMOS tube Q1, and the S pole of the PMOS tube Q1 is electrically connected to the cathode of the diode D1, the 2nd pin of the first Schottky diode D2, the VCC pin and the CTL pin of the low voltage drop linear regulator IC1, one end of the first capacitor C1, and the positive pole of the electrolytic capacitor CE1, and the cathode of the electrolytic capacitor CE1 is electrically connected to the other end of the first capacitor C1, one end of the third capacitor C3, the GND pin of the low voltage drop linear regulator IC1, one end of the second capacitor C2, one end of the first resistor R1, one end of the third resistor R3, and the GND pin of the second capacitor C3. Pin 2 of the Schottky diode D3 is electrically connected, the other end of the first resistor R1 is electrically connected to the G pole of the PMOS tube Q1 and the positive pole of the diode D1 respectively, the other end of the second capacitor C2 is electrically connected to pin 1 of the first Schottky diode D2, the VOUT pin of the low-voltage difference linear regulator IC1, the 3rd pin of the second Schottky diode D3, and the thirty-fourth resistor R34 respectively, the other end of the third capacitor C3 is electrically connected to one end of the second resistor R2 and pin 1 of the second Schottky diode D3 respectively, and the other end of the second resistor R2 is electrically connected to the other end of the third resistor R3.

[0089] Further, in another embodiment, the fan PWM control operational amplifier circuit includes a first operational amplifier U2A, a third operational amplifier U2C, a fourth operational amplifier U2D, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10;

[0090] The step-down circuit is electrically connected to one end of the fourth capacitor C4, one end of the fourth resistor R4, and pin 3 of the first operational amplifier U2A, respectively; the other end of the fourth capacitor C4 is electrically connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, and pin 2 of the first operational amplifier U2A, respectively; the other end of the fifth resistor R5 is electrically connected to pin 4 of the first operational amplifier U2A and one end of the fifth capacitor C5, respectively; pin 11 of the first operational amplifier U2A is electrically connected to the other end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the eighth resistor R8, respectively; the other end of the sixth capacitor C6 is electrically connected to one end of the seventh resistor R7, respectively; Pin 12 of the fourth operational amplifier U2D is electrically connected, the other end of the seventh resistor R7 is electrically connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is electrically connected to pin 1 of the first operational amplifier U2A, the other end of the eighth resistor R8 is electrically connected to pin 10 of the third operational amplifier U2C and one end of the ninth resistor R9, the other end of the ninth resistor R9 is electrically connected to pins 13 and 14 of the fourth operational amplifier U2D, pin 9 of the third operational amplifier U2C is electrically connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is electrically connected to pin 8 of the third operational amplifier U2C.

[0091] Further, in another embodiment, the wind turbine precision voltage-frequency conversion circuit includes a first voltage-frequency converter U2, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20;

[0092] The fan PWM control operational amplifier circuit is electrically connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is respectively electrically connected to the seventh capacitor C7 and the COMP IN pin of the first voltage-frequency converter U2, the REF I pin of the first voltage-frequency converter U2 is electrically connected to the eleventh resistor R11, the THR pin of the first voltage-frequency converter U2 is respectively electrically connected to the IOUT pin of the first voltage-frequency converter U2, one end of the thirteenth resistor R13, and one end of the tenth capacitor C10, the other end of the thirteenth resistor R13 is respectively electrically connected to the other end of the tenth capacitor C10, one end of the sixteenth resistor R16, and one end of the eighteenth resistor R18, the other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17, and the FREQ pin of the first voltage-frequency converter U2 The OUT pin is electrically connected to one end of the nineteenth resistor R19 and one end of the twentieth resistor R20 respectively, the RC pin of the first voltage-frequency converter U2 is electrically connected to one end of the ninth capacitor C9 and one end of the fourteenth resistor R14 respectively, the other end of the fourteenth resistor R14 is electrically connected to one end of the fifteenth resistor R15, the other end of the ninth capacitor C9 is electrically connected to the GND pin of the first voltage-frequency converter U2 and one end of the eighth capacitor C8 respectively, the other end of the eighth capacitor C8 is electrically connected to the VS pin of the first voltage-frequency converter U2, and the trigger circuit is electrically connected to the other end of the eighth capacitor C8, the other end of the fifteenth resistor R15, the other end of the seventeenth resistor R17, and the other end of the twentieth resistor R20 respectively.

[0093] Further, in another embodiment, the trigger circuit includes a trigger U1, an eleventh capacitor C11, a twenty-first resistor R21, and a twenty-second resistor R22;

[0094] The fan precision voltage-frequency conversion circuit is electrically connected to the VCC pin of the trigger, the other end of the twenty-first resistor R21, the CLOCK2 pin of the trigger, and the other end of the twenty-second resistor R22, respectively; the VCC pin of the trigger is electrically connected to one end of the eleventh capacitor C11; the RESET2 pin of the trigger is electrically connected to one end of the twenty-first resistor R21 and the SET2 pin of the trigger, respectively; the DATA2 pin of the trigger is electrically connected to the Q2# pin of the trigger; the Q2 pin of the trigger is electrically connected to the fan speed feedback circuit; one end of the twenty-second resistor R22 of the trigger is electrically connected to the RESET1 pin of the trigger and one end of the SET1 pin of the trigger, respectively; the DATA1 pin of the trigger is electrically connected to the Q1# pin of the trigger; the CLOCK1 pin of the trigger is electrically connected to the domestic hot water precision voltage-frequency conversion circuit; and the Q1 pin of the trigger is electrically connected to the domestic hot water flow feedback circuit.

[0095] Further, in another embodiment, the domestic hot water precision voltage-frequency conversion circuit includes a second voltage-frequency converter U3, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, and a thirty-first resistor R31;

[0096] The REF I pin of the second voltage-frequency converter U3 is electrically connected to one end of the thirty-first resistor R31, the other end of the thirty-first resistor R31 is electrically connected to one end of the thirtieth resistor R30, the other end of the thirtieth resistor R30 is electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13, respectively, the THR pin of the second voltage-frequency converter U3 is electrically connected to the other end of the twenty-ninth resistor R29, the other end of the thirteenth capacitor C13, and the IOUT pin of the second voltage-frequency converter U3, respectively, and the COMP pin of the second voltage-frequency converter U3 is electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13, respectively. The IN pin is electrically connected to the domestic hot water control operational amplifier circuit, the VS pin of the second voltage-frequency converter U3 is electrically connected to one end of the fourteenth capacitor C14, the other end of the fourteenth capacitor C14 is respectively electrically connected to the domestic hot water control operational amplifier circuit, the GND pin of the second voltage-frequency converter U3, and one end of the twelfth capacitor C12, the RC pin of the second voltage-frequency converter U3 is respectively electrically connected to the other end of the twelfth capacitor C12 and one end of the twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is electrically connected to one end of the twenty-third resistor R23, the other end of the twenty-third resistor R23 is respectively electrically connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27, the trigger circuit, and the fan precision voltage-frequency conversion circuit, the other end of the twenty-seventh resistor R27 is electrically connected to the other end of the twenty-eighth resistor R28, the other end of the twenty-fourth resistor R24 ​​is respectively electrically connected to one end of the twenty-fifth resistor R25 and the FREQ OUT pin of the second voltage-frequency converter U3, and the other end of the twenty-fifth resistor R25 is electrically connected to the trigger circuit.

[0097] Further, in another embodiment, the domestic hot water control operational amplifier circuit includes a second operational amplifier U2B, a fifteenth capacitor C15, a thirty-second resistor R32, a thirty-third resistor R33, and a first jumper J11;

[0098] Pin 7 of the second operational amplifier U2B is electrically connected to pin 6 of the second operational amplifier U2B and one end of the thirty-second resistor R32, respectively; the other end of the thirty-second resistor R32 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit and one end of the fifteenth capacitor C15, respectively; the other end of the fifteenth capacitor C15 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit, one end of the first jumper J11, and the domestic hot water flow feedback circuit, respectively; the other end of the first jumper J11 is electrically connected to one end of the thirty-third resistor R33, and the other end of the thirty-third resistor R33 is electrically connected to pin 5 of the second operational amplifier U2B.

[0099] Further, in another embodiment, the domestic hot water flow feedback circuit includes a second connector J2, a second NPN transistor Q2, a sixteenth capacitor C16, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, and a second jumper J13;

[0100] The DHWTACHO pin of the second connector J2 is electrically connected to one end of the second jumper J13 and the collector of the second NPN transistor Q2, respectively; the other end of the second jumper J13 is electrically connected to one end of the thirty-seventh resistor R37, the other end of the thirty-seventh resistor R37 is electrically connected to one end of the sixteenth capacitor C16, the other end of the sixteenth capacitor C16 is electrically connected to the emitter of the second NPN transistor Q2, one end of the thirty-sixth resistor R36, and the domestic hot water control operational amplifier circuit, the other end of the thirty-sixth resistor R36 is electrically connected to one end of the thirty-fifth resistor R35 and the base of the second NPN transistor Q2, and the other end of the thirty-fifth resistor R35 is electrically connected to the trigger circuit.

[0101] Further, in another embodiment, the fan speed feedback circuit includes a first NPN transistor Q1, a seventeenth capacitor C17, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, and a third jumper J15;

[0102] The base of the first NPN transistor Q1 is electrically connected to one end of the thirty-eighth resistor R38 and one end of the thirty-ninth resistor R39 respectively, the other end of the thirty-eighth resistor R38 is electrically connected to the trigger circuit, the other end of the thirty-ninth resistor R39 is electrically connected to the emitter of the first NPN transistor Q1 and one end of the seventeenth capacitor C17 respectively, the other end of the seventeenth capacitor C17 is electrically connected to one end of the fortieth resistor R40, the other end of the fortieth resistor R40 is electrically connected to one end of the third jumper J15, and the other end of the third jumper J15 is connected to the collector of the first NPN transistor Q1.

[0103] According to another aspect of the present invention, a control method for a boiler fan and a domestic hot water simulation device is provided, comprising the following steps:

[0104] Step S1: Connect the control line of the boiler PWM fan to the terminal of the first connector J1;

[0105] Step S2: Turn on the PCB power supply of the furnace, and the control unit of the boiler inputs a 24V voltage to the Vin and GND ends of the analog board. The analog board stabilizes the 24V voltage to 5V through the step-down circuit, and supplies it to the power supply pins of each integrated IC of the analog board to ensure the normal operation of the chip;

[0106] Step S3: When the boiler enters different stages, the fan speed set internally is transmitted to the internal processing unit of the analog board through the PWM interface of the first connector J1 terminal, and the transmitted signal is amplified by the operational amplifier U2;

[0107] Step S4: transmitting the amplified signal to the first voltage-frequency converter U2 to convert the voltage into frequency;

[0108] Step S5: The corresponding frequency passes through the trigger U1, and by controlling the turn-off of the first NPN transistor Q1, the signal feedback signal is transmitted to the PCB control unit of the boiler through the TACHO pin of the first connector J1. The control unit of the boiler receives the signal of the TACHO pin and performs the corresponding next step instruction;

[0109] Step S6: Connect the control line of the boiler domestic hot water to the corresponding terminal of the second connector J2;

[0110] Step S7: The control unit of the boiler provides a 5V power supply, which is connected to the CCW pin and the GND pin of the second connector J2;

[0111] Step S8: applying a variable voltage signal to the WLPER pin of the second connector J2, and amplifying the input signal through the operational amplifier U2;

[0112] Step S9: transmitting the amplified signal to the second voltage-frequency converter U3 to convert the voltage into frequency;

[0113] Step S10: The corresponding frequency passes through the trigger U1, and by controlling the turn-off of the second NPN transistor Q2, the signal feedback signal is transmitted to the PCB control unit of the boiler through the DHWTACHO pin of the second connector J2. The control unit of the boiler starts the instruction of the domestic hot water mode of the boiler by receiving the signal of the DHWTACHO pin;

[0114] Step S11: By closing the input of the WLPER pin signal of the second connector J2, the furnace is turned off in the domestic hot water mode when simulating no water flow;

[0115] Step S12: Steps 6 to 11 may be repeated to confirm the working status of the boiler under different water flow rates.

[0116] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the boiler blower and domestic hot water simulation device and control method of the present invention, and can produce the positive effects recorded in the present invention.

[0117] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0118] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0119] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A boiler fan and domestic hot water simulation device, characterized in that: It includes a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit and a domestic hot water flow feedback circuit; The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit, and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected to the trigger circuit; The step-down circuit is used to reduce the voltage value. The fan PWM control operational amplifier circuit is used to amplify the PWM signal given by the controller and then transmit it to the fan precision voltage-frequency conversion circuit to be able to identify a variable voltage signal. The fan precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the fan PWM control operational amplifier circuit into a corresponding frequency signal. The trigger circuit is used to automatically execute the output when the received frequency signal meets the trigger condition, and give the subsequent feedback circuit an opening and closing signal of the corresponding frequency. The domestic hot water control amplifier circuit is used to amplify the pulse signal given by the controller and then transmit it to the domestic hot water precision voltage-frequency conversion circuit to generate a variable voltage signal that can be recognized. The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the domestic hot water control amplifier circuit into a corresponding frequency signal. The domestic hot water flow feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of the entire domestic hot water flow. The fan speed feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of whether the entire fan is running at the expected speed.

2. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The step-down circuit includes a low voltage difference linear regulator IC1, a first connector J1, a PMOS tube Q1, a diode D1, a first Schottky diode D2, a second Schottky diode D3, an electrolytic capacitor CE1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, and a thirty-fourth resistor R34; The VIN pin of the first connector J1 is electrically connected to the D pole of the PMOS tube Q1, and the S pole of the PMOS tube Q1 is electrically connected to the cathode of the diode D1, the 2nd pin of the first Schottky diode D2, the VCC pin and the CTL pin of the low voltage drop linear regulator IC1, one end of the first capacitor C1, and the positive pole of the electrolytic capacitor CE1, and the cathode of the electrolytic capacitor CE1 is electrically connected to the other end of the first capacitor C1, one end of the third capacitor C3, the GND pin of the low voltage drop linear regulator IC1, one end of the second capacitor C2, one end of the first resistor R1, one end of the third resistor R3, and the GND pin of the second capacitor C3. Pin 2 of the Schottky diode D3 is electrically connected, the other end of the first resistor R1 is electrically connected to the G pole of the PMOS tube Q1 and the positive pole of the diode D1 respectively, the other end of the second capacitor C2 is electrically connected to pin 1 of the first Schottky diode D2, the VOUT pin of the low-voltage difference linear regulator IC1, the 3rd pin of the second Schottky diode D3, and the thirty-fourth resistor R34 respectively, the other end of the third capacitor C3 is electrically connected to one end of the second resistor R2 and pin 1 of the second Schottky diode D3 respectively, and the other end of the second resistor R2 is electrically connected to the other end of the third resistor R3.

3. The boiler fan and domestic hot water simulation device according to claim 2, characterized in that: The fan PWM control operational amplifier circuit includes a first operational amplifier U2A, a third operational amplifier U2C, a fourth operational amplifier U2D, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10; The step-down circuit is electrically connected to one end of the fourth capacitor C4, one end of the fourth resistor R4, and pin 3 of the first operational amplifier U2A, respectively; the other end of the fourth capacitor C4 is electrically connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, and pin 2 of the first operational amplifier U2A, respectively; the other end of the fifth resistor R5 is electrically connected to pin 4 of the first operational amplifier U2A and one end of the fifth capacitor C5, respectively; pin 11 of the first operational amplifier U2A is electrically connected to the other end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the eighth resistor R8, respectively; the other end of the sixth capacitor C6 is electrically connected to one end of the seventh resistor R7, respectively; Pin 12 of the fourth operational amplifier U2D is electrically connected, the other end of the seventh resistor R7 is electrically connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is electrically connected to pin 1 of the first operational amplifier U2A, the other end of the eighth resistor R8 is electrically connected to pin 10 of the third operational amplifier U2C and one end of the ninth resistor R9, the other end of the ninth resistor R9 is electrically connected to pins 13 and 14 of the fourth operational amplifier U2D, pin 9 of the third operational amplifier U2C is electrically connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is electrically connected to pin 8 of the third operational amplifier U2C.

4. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The fan precision voltage-frequency conversion circuit includes a first voltage-frequency converter U2, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20; The fan PWM control operational amplifier circuit is electrically connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is respectively electrically connected to the seventh capacitor C7 and the COMP IN pin of the first voltage-frequency converter U2, the REF I pin of the first voltage-frequency converter U2 is electrically connected to the eleventh resistor R11, the THR pin of the first voltage-frequency converter U2 is respectively electrically connected to the IOUT pin of the first voltage-frequency converter U2, one end of the thirteenth resistor R13, and one end of the tenth capacitor C10, the other end of the thirteenth resistor R13 is respectively electrically connected to the other end of the tenth capacitor C10, one end of the sixteenth resistor R16, and one end of the eighteenth resistor R18, the other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17, and the FREQ pin of the first voltage-frequency converter U2 The OUT pin is electrically connected to one end of the nineteenth resistor R19 and one end of the twentieth resistor R20 respectively, the RC pin of the first voltage-frequency converter U2 is electrically connected to one end of the ninth capacitor C9 and one end of the fourteenth resistor R14 respectively, the other end of the fourteenth resistor R14 is electrically connected to one end of the fifteenth resistor R15, the other end of the ninth capacitor C9 is electrically connected to the GND pin of the first voltage-frequency converter U2 and one end of the eighth capacitor C8 respectively, the other end of the eighth capacitor C8 is electrically connected to the VS pin of the first voltage-frequency converter U2, and the trigger circuit is electrically connected to the other end of the eighth capacitor C8, the other end of the fifteenth resistor R15, the other end of the seventeenth resistor R17, and the other end of the twentieth resistor R20 respectively.

5. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The trigger circuit includes a trigger U1, an eleventh capacitor C11, a twenty-first resistor R21, and a twenty-second resistor R22; The fan precision voltage-frequency conversion circuit is electrically connected to the VCC pin of the trigger, the other end of the twenty-first resistor R21, the CLOCK2 pin of the trigger, and the other end of the twenty-second resistor R22, respectively; the VCC pin of the trigger is electrically connected to one end of the eleventh capacitor C11; the RESET2 pin of the trigger is electrically connected to one end of the twenty-first resistor R21 and the SET2 pin of the trigger, respectively; the DATA2 pin of the trigger is electrically connected to the Q2# pin of the trigger; the Q2 pin of the trigger is electrically connected to the fan speed feedback circuit; one end of the twenty-second resistor R22 of the trigger is electrically connected to the RESET1 pin of the trigger and one end of the SET1 pin of the trigger, respectively; the DATA1 pin of the trigger is electrically connected to the Q1# pin of the trigger; the CLOCK1 pin of the trigger is electrically connected to the domestic hot water precision voltage-frequency conversion circuit; and the Q1 pin of the trigger is electrically connected to the domestic hot water flow feedback circuit.

6. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The domestic hot water precision voltage-frequency conversion circuit includes a second voltage-frequency converter U3, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, and a thirty-first resistor R31; The REF I pin of the second voltage-frequency converter U3 is electrically connected to one end of the thirty-first resistor R31, the other end of the thirty-first resistor R31 is electrically connected to one end of the thirtieth resistor R30, the other end of the thirtieth resistor R30 is electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13, respectively, the THR pin of the second voltage-frequency converter U3 is electrically connected to the other end of the twenty-ninth resistor R29, the other end of the thirteenth capacitor C13, and the IOUT pin of the second voltage-frequency converter U3, respectively, and the COMP pin of the second voltage-frequency converter U3 is electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13, respectively. The IN pin is electrically connected to the domestic hot water control operational amplifier circuit, the VS pin of the second voltage-frequency converter U3 is electrically connected to one end of the fourteenth capacitor C14, the other end of the fourteenth capacitor C14 is respectively electrically connected to the domestic hot water control operational amplifier circuit, the GND pin of the second voltage-frequency converter U3, and one end of the twelfth capacitor C12, the RC pin of the second voltage-frequency converter U3 is respectively electrically connected to the other end of the twelfth capacitor C12 and one end of the twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is electrically connected to one end of the twenty-third resistor R23, the other end of the twenty-third resistor R23 is respectively electrically connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27, the trigger circuit, and the fan precision voltage-frequency conversion circuit, the other end of the twenty-seventh resistor R27 is electrically connected to the other end of the twenty-eighth resistor R28, the other end of the twenty-fourth resistor R24 ​​is respectively electrically connected to one end of the twenty-fifth resistor R25 and the FREQ OUT pin of the second voltage-frequency converter U3, and the other end of the twenty-fifth resistor R25 is electrically connected to the trigger circuit.

7. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The domestic hot water control operational amplifier circuit includes a second operational amplifier U2B, a fifteenth capacitor C15, a thirty-second resistor R32, a thirty-third resistor R33, and a first jumper J11; Pin 7 of the second operational amplifier U2B is electrically connected to pin 6 of the second operational amplifier U2B and one end of the thirty-second resistor R32, respectively; the other end of the thirty-second resistor R32 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit and one end of the fifteenth capacitor C15, respectively; the other end of the fifteenth capacitor C15 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit, one end of the first jumper J11, and the domestic hot water flow feedback circuit, respectively; the other end of the first jumper J11 is electrically connected to one end of the thirty-third resistor R33, and the other end of the thirty-third resistor R33 is electrically connected to pin 5 of the second operational amplifier U2B.

8. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The domestic hot water flow feedback circuit includes a second connector J2, a second NPN transistor Q2, a sixteenth capacitor C16, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, and a second jumper J13; The DHWTACHO pin of the second connector J2 is electrically connected to one end of the second jumper J13 and the collector of the second NPN transistor Q2, respectively; the other end of the second jumper J13 is electrically connected to one end of the thirty-seventh resistor R37, the other end of the thirty-seventh resistor R37 is electrically connected to one end of the sixteenth capacitor C16, the other end of the sixteenth capacitor C16 is electrically connected to the emitter of the second NPN transistor Q2, one end of the thirty-sixth resistor R36, and the domestic hot water control operational amplifier circuit, the other end of the thirty-sixth resistor R36 is electrically connected to one end of the thirty-fifth resistor R35 and the base of the second NPN transistor Q2, and the other end of the thirty-fifth resistor R35 is electrically connected to the trigger circuit.

9. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The fan speed feedback circuit includes a first NPN transistor Q1, a seventeenth capacitor C17, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, and a third jumper J15; The base of the first NPN transistor Q1 is electrically connected to one end of the thirty-eighth resistor R38 and one end of the thirty-ninth resistor R39 respectively, the other end of the thirty-eighth resistor R38 is electrically connected to the trigger circuit, the other end of the thirty-ninth resistor R39 is electrically connected to the emitter of the first NPN transistor Q1 and one end of the seventeenth capacitor C17 respectively, the other end of the seventeenth capacitor C17 is electrically connected to one end of the fortieth resistor R40, the other end of the fortieth resistor R40 is electrically connected to one end of the third jumper J15, and the other end of the third jumper J15 is connected to the collector of the first NPN transistor Q1.

10. The control method of the boiler fan and the domestic hot water simulation device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: Connect the control line of the boiler PWM fan to the terminal of the first connector J1; Step S2: Turn on the PCB power supply of the furnace, and the control unit of the boiler inputs a 24V voltage to the Vin and GND ends of the analog board. The analog board stabilizes the 24V voltage to 5V through the step-down circuit, and supplies it to the power supply pins of each integrated IC of the analog board to ensure the normal operation of the chip; Step S3: When the boiler enters different stages, the fan speed set internally is transmitted to the internal processing unit of the analog board through the PWM interface of the first connector J1 terminal, and the transmitted signal is amplified by the operational amplifier U2; Step S4: transmitting the amplified signal to the first voltage-frequency converter U2 to convert the voltage into frequency; Step S5: The corresponding frequency passes through the trigger U1, and by controlling the turn-off of the first NPN transistor Q1, the signal feedback signal is transmitted to the PCB control unit of the boiler through the TACHO pin of the first connector J1. The control unit of the boiler receives the signal of the TACHO pin and performs the corresponding next step instruction; Step S6: Connect the control line of the boiler domestic hot water to the corresponding terminal of the second connector J2; Step S7: The control unit of the boiler provides a 5V power supply, which is connected to the CCW pin and the GND pin of the second connector J2; Step S8: applying a variable voltage signal to the WLPER pin of the second connector J2, and amplifying the input signal through the operational amplifier U2; Step S9: transmitting the amplified signal to the second voltage-frequency converter U3 to convert the voltage into frequency; Step S10: The corresponding frequency passes through the trigger U1, and by controlling the turn-off of the second NPN transistor Q2, the signal feedback signal is transmitted to the PCB control unit of the boiler through the DHWTACHO pin of the second connector J2. The control unit of the boiler starts the instruction of the domestic hot water mode of the boiler by receiving the signal of the DHWTACHO pin; Step S11: By closing the input of the WLPER pin signal of the second connector J2, the furnace is turned off in the domestic hot water mode when simulating no water flow; Step S12: Steps 6 to 11 may be repeated to confirm the working status of the boiler under different water flow rates.

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