Gas positive displacement water heater circuit

Abstract

The utility model discloses a gas positive displacement water heater circuit, and relates to the field of water heaters. Comprising a main control circuit, a plurality of fan branch control circuits and a power circuit, the output end of the power circuit is connected to the input end of the main control circuit, the output end of the main control circuit is connected to the fan branch control circuits, and the output ends of the fan branch control circuits are connected to fans. The fan branch control circuit comprises a feedback circuit used for feeding back the rotating speed of the fan and a rotating speed control circuit used for controlling the rotating speed of the fan. Due to the fact that the main control circuit is connected with the multiple fan branch control circuits, the rotating speed of the fan is detected through the feedback circuit, then the detected rotating speed of the fan is fed back to the main control circuit, the main control circuit processes data, and then the air speed of the fan is adjusted and controlled by controlling the air speed control circuit. The air volume and the fan rotating speed are monitored in real time, the reliability of the whole machine is greatly improved, and the cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water heater, especially a kind of gas volumetric water heater circuit. BACKGROUND

[0002] Gas volumetric water heater generates heat by burning gas, and transfers heat energy to cold water flowing through heat exchanger, so as to heat cold water and store in built-in water tank. When user needs to use hot water, hot water flows out from water tank, while cold water is replenished into water tank for heating again. Therefore, it is particularly important to control gas combustion of gas volumetric water heater.

[0003] In the prior art, alternating current fan is usually used to control gas combustion of gas volumetric water heater in cooperation with air pressure switch, but this method cannot realize accurate and real-time adjustment of fan output air volume, and air pressure switch is prone to failure and has high cost. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of gas volumetric water heater circuit to overcome the problem that water heater circuit cannot realize accurate and real-time adjustment of fan output air volume, and air pressure switch is prone to failure and has high cost.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of gas volumetric water heater circuit, including main control circuit, multiple fan sub-control circuits and power supply circuit, the output end of the power supply circuit is connected to the input end of the main control circuit, the output end of the main control circuit is connected to the fan sub-control circuit, the output end of the fan sub-control circuit is connected to fan, the fan sub-control circuit includes feedback circuit for feeding back fan speed and speed control circuit for controlling fan speed.

[0007] The gas volumetric water heater circuit as described above, the speed control circuit includes first amplifier IC1A, the noninverting input end of the first amplifier IC1A is connected to the FJPWM port of the main control circuit, the inverting input end of the first amplifier IC1A is connected to the output end of the first amplifier IC1A, the output end of the first amplifier IC1A is connected to the Vsp port of fan.

[0008] The gas volumetric water heater circuit as described above, the speed control circuit is also connected with fan on-off circuit, the fan on-off circuit includes triode Q1, the base of the triode Q1 is connected with resistor R87, the output end of the resistor R87 is connected to the noninverting input end of the first amplifier IC1A, the collector of the triode Q1 is connected to the output end of the first amplifier IC1A, the emitter of the triode Q1 is connected to ground terminal.

[0009] The gas volume type water heater circuit as described above, the output end of the first amplifier IC1A is also connected with the input end of the resistance R5, the output end of the resistance R5 is also connected with the capacitor C2 and the capacitor C6, the other end of the capacitor C2 and the capacitor C6 is commonly connected with the ground end.

[0010] The gas volume type water heater circuit as described above, the feedback circuit comprises the resistance R21, the FJCS port of the main control circuit is connected with the input end of the resistance R21, the output end of the resistance R21 is connected with the FG port of the fan.

[0011] The gas volume type water heater circuit as described above, the feedback circuit is also connected with the feedback on-off circuit, the feedback on-off circuit comprises the transistor Q4, the base of the transistor Q4 is connected with the FG port of the fan, the collector of the transistor Q4 is connected with the FJCS port of the main control circuit, the emitter of the transistor Q4 is connected with the ground end.

[0012] The gas volume type water heater circuit as described above, the GND port of the fan is connected with the non-inverting input end of the second amplifier IC1B, the output end of the second amplifier IC1B is connected with the FJIS port of the main control circuit, the inverting input end of the second amplifier IC1B is connected with the resistance R35, the output end of the resistance R35 is connected with the ground end, the output end of the second amplifier IC1B and the inverting output end of the second amplifier IC1B are connected in parallel with the resistance R33 and the capacitor C39.

[0013] The gas volume type water heater circuit as described above, comprising the resistance R25, the resistance R26 and the diode D2, the output end of the second amplifier IC1B is connected with the input end of the resistance R25, the output end of the resistance R25 is connected with the input end of the resistance R2, the output end of the resistance R26 is connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with the power supply, the resistance R25 and the resistance R26 are also connected with the capacitor C34, the other end of the capacitor C34 is connected with the ground end, the positive electrode of the diode D2 is connected with the capacitor C36, the other end of the capacitor C36 is connected with the ground end.

[0014] The gas volume type water heater circuit as described above, the power supply circuit comprises the first step-down circuit, the first step-down circuit comprises the first step-down chip IC3, the VIN port of the first step-down chip IC3 is connected with the power supply and connected with the capacitor C45 and the electrolytic capacitor E6, the other end of the capacitor C45 and the electrolytic capacitor E6 is commonly connected with the ground end, the output end of the first step-down chip IC3 is connected with the inductor L2, the output end of the inductor L2 is connected with the main control circuit.

[0015] The gas volumetric water heater circuit as described above comprises a communication circuit, the communication circuit comprises a communication chip IC5, an input end of the communication chip IC5 is connected to an output end of the main control circuit, an A port of the communication chip IC5 is connected with a patch resistor F4, an output end of the patch resistor F4 is connected with a Wi-Fi module, a B port of the communication chip IC5 is connected with a patch resistor F5, and an output end of the patch resistor is connected to the Wi-Fi module.

[0016] Compared with the prior art, the technical scheme has the beneficial effects that:

[0017] After the structure of the utility model is adopted, since the main control circuit is connected with multiple fan sub-control circuits, and the fan sub-control circuit comprises a feedback circuit and a wind speed control circuit, the speed of the fan is detected through the feedback circuit, the detected fan speed is fed back to the main control circuit, the data is processed through the main control circuit, and then the wind speed of the fan is adjusted and controlled through the wind speed control circuit, the size of the air volume and the speed of the fan are monitored in real time, the air pressure switch is reduced, the reliability of the whole machine is greatly increased, and the cost is effectively reduced.

[0018] The additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying the creativity labor.

[0020] Figure 1 It is the fan wind control circuit of the utility model;

[0021] Figure 2 It is the fan on-off circuit of the utility model;

[0022] Figure 3 It is the feedback on-off circuit of the utility model;

[0023] Figure 4 It is the main control circuit of the utility model;

[0024] Figure 5 It is the power supply circuit of the utility model;

[0025] Figure 6 It is the communication circuit of the utility model;

[0026] Figure 7 This is the flame detection circuit of this utility model;

[0027] Figure 8 This is the display driver circuit of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1 to 5 The circuit diagram of a gas-fired storage water heater includes a main control circuit 1, multiple fan sub-control circuits 2, and a power supply circuit 3. The output terminal of the power supply circuit 3 is connected to the input terminal of the main control circuit 1, and the output terminal of the main control circuit 1 is connected to the fan sub-control circuits 2. The output terminal of the fan sub-control circuits 2 is connected to the fan. The fan sub-control circuits 2 include a feedback circuit 21 for feeding back the fan speed and a speed control circuit 22 for controlling the fan speed. With this structure, since the main control circuit is connected to multiple fan sub-control circuits, and each fan sub-control circuit includes a feedback circuit and a speed control circuit, the fan speed is detected by the feedback circuit, and then fed back to the main control circuit based on the detected fan speed. The main control circuit processes the data and then adjusts and controls the fan speed through the speed control circuit. Real-time monitoring of airflow and fan speed greatly increases the reliability of the entire unit and effectively reduces costs. The main control circuit 1 uses a chip of model SC95F8616BP44R / ROHS as the main control chip. The fan is a 24V DC fan of model FL120-24VDC fully premixed fan. The fan speed is controlled by PWM pulse width modulation. In this application, a one-to-two method is used to control the fans, etc., which effectively controls the cost, and the controller size is smaller and does not need to occupy too much space.

[0030] like Figure 1As shown, and not as a limitation, in order to achieve more stable fan speed control, the speed control circuit 22 includes a first amplifier IC1A. The non-inverting input of the first amplifier IC1A is connected to the FJPWM port of the main control circuit 1, the inverting input of the first amplifier IC1A is connected to its output, and the output of the first amplifier IC1A is connected to the Vsp port of the fan. The negative terminal of the first amplifier IC1A is connected to ground, the positive terminal is connected to a 12V power supply, and the inverting input and output are connected to form a voltage follower. This means that the voltage at the non-inverting input of the first amplifier IC1A is infinitely equal to the output voltage, protecting the signal from interference and balancing the impedance difference between the signal source and the load.

[0031] like Figure 2 As shown, furthermore, to control the on / off state of the fan, the speed control circuit 22 is also connected to a fan on / off circuit 23. The fan on / off circuit 23 includes a transistor Q1, with a resistor R87 connected to the base of transistor Q1. The output of resistor R87 is connected to the non-inverting input of the first amplifier IC1A. The collector of transistor Q1 is connected to the output of the first amplifier IC1A, and the emitter of transistor Q1 is connected to ground. The main control chip in the main control circuit 1 outputs a voltage to the base of transistor Q1, causing transistor Q1 to conduct. When conducting, it lowers the operating voltage of the normal circuit, thereby stopping the motor. Resistor R87 is used to protect the circuit from overload. A resistor R89 ​​is also connected between the base of transistor Q1 and the output of resistor R87, with the output of resistor R89 ​​connected to ground.

[0032] As a specific implementation and not a limitation, to make the current input to the fan more stable, the output terminal of the first amplifier IC1A is also connected to the input terminal of resistor R5. The output terminal of resistor R5 is also connected to capacitors C2 and C6, and the other ends of capacitors C2 and C6 are connected to ground. Capacitors C2 and C6 are used to filter the output current of the first amplifier IC1A to suppress or eliminate unwanted or interfering components, which helps to enhance system performance and improve the equipment's anti-interference capability.

[0033] Furthermore, to achieve feedback of the fan speed, the feedback circuit 21 includes a resistor R21. The FJCS port of the main control circuit 1 is connected to the input terminal of the resistor R21, and the output terminal of the resistor R21 is connected to the FG port of the fan. Since the fan has its own signal line that can detect the fan speed, and its output port is the FG port, the fan speed can be obtained by receiving and processing the fan speed signal through the main control chip of the main control circuit.

[0034] like Figure 3 As shown, and not as a limitation, in order to control the system to read the fan speed in real time, the feedback circuit 21 is also connected to a feedback on / off circuit 24. The feedback on / off circuit 24 includes a transistor Q4. The base of the transistor Q4 is connected to the FG port of the fan, the collector of the transistor Q4 is connected to the FJCS port of the main control circuit 1, and the emitter of the transistor Q4 is connected to ground. In this application, the main control chip of the main control circuit 1 outputs a voltage to the base of the transistor Q4, thereby controlling the on / off state of the transistor Q4, realizing free on / off switching and free reading of the fan speed.

[0035] Furthermore, the GND port of the fan is connected to the non-inverting input of the second amplifier IC1B, the output of the second amplifier IC1B is connected to the FJIS port of the main control circuit, the inverting input of the second amplifier IC1B is connected to a resistor R35, the output of the resistor R35 is connected to the ground terminal, and a resistor R33 and a capacitor C39 are connected in parallel between the output of the second amplifier IC1B and the inverting output of the second amplifier IC1B.

[0036] As a specific implementation and not a limitation, the system includes resistors R25 and R26, and diode D2. The output terminal of the second amplifier IC1B is connected to the input terminal of resistor R25, the output terminal of resistor R25 is connected to the input terminal of resistor R2, the output terminal of resistor R26 is connected to the anode of diode D2, the cathode of diode D2 is connected to the power supply, a capacitor C34 is connected between resistors R25 and R26, the other end of capacitor C34 is connected to ground, the anode of diode D2 is connected to capacitor C36, and the other end of capacitor C36 is connected to ground.

[0037] like Figure 5As shown, as a specific embodiment rather than limitation, in order to provide a stable power supply to the system, the power supply circuit 3 includes a first step-down circuit 31, which includes a first step-down chip IC3, the VIN port of which is connected to the power supply and connected with a capacitor C45 and an electrolytic capacitor E6, the other end of which is connected to the ground together with the capacitor C45 and the electrolytic capacitor E6, and the output end of the first step-down chip IC3 is connected with an inductor L2, the output end of which is connected to the main control circuit 1. The first step-down chip IC3 adopts XL2596 chip, which can reduce 24V voltage to 12V voltage for output, and the power supply circuit 3 further includes a second step-down circuit 32, which includes a second step-down chip, which adopts XL1508-5V chip, which can reduce 24V voltage to 5V voltage for output.

[0038] As shown in the figure, Figure 6 Further, in order to realize remote control, a communication circuit 4 is included, which includes a communication chip IC5, the input end of which is connected to the output end of the main control circuit 1, the A port of which is connected with a patch resistor F4, the output end of which is connected to a Wi-Fi module, and the B port of which is connected with a patch resistor F5, the output end of which is connected to the Wi-Fi module. In this application, the communication chip IC5 adopts MAX485ESA / LSSOP-8 chip, which has the characteristics of small size, low power consumption, high anti-interference, etc. The communication chip IC5 is also connected with a Wi-Fi module, and the user can connect with the Wi-Fi module through a mobile phone and other client, so as to remotely control the system and realize multifunctionalization.

[0039] In this application, a flame detection circuit 5 is also provided, as shown in the figure, Figure 7 The flame detection circuit 5 is used to detect the flame and its burning degree, etc. In this application, a display driving circuit 6 is also provided, as shown in the figure, Figure 8 The display driving circuit drives the display and displays the working state of the system, temperature and other information on the display.

[0040] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A gas-fired volumetric water heater circuit, characterised in that, It includes main control circuit (1), a plurality of fan sub-control circuit (2) and power supply circuit (3), the output of power supply circuit (3) is connected to the input of main control circuit (1), the output of main control circuit (1) is connected to fan sub-control circuit (2), the output of fan sub-control circuit (2) is connected to fan, fan sub-control circuit (2) includes feedback circuit (21) for feeding back fan speed and speed control circuit (22) for controlling fan speed.

2. A gas volumetric water heater circuit according to claim 1, characterised in that, The speed control circuit (22) includes a first amplifier IC1A, the noninverting input of the first amplifier IC1A is connected to the FJPWM port of the main control circuit (1), the inverting input of the first amplifier IC1A is connected to the output of the first amplifier IC1A, and the output of the first amplifier IC1A is connected to the Vsp port of the fan.

3. A gas volumetric water heater circuit according to claim 2, characterised in that, The speed control circuit (22) is also connected with fan on-off circuit (23), the fan on-off circuit (23) includes a transistor Q1, the base of the transistor Q1 is connected with a resistor R87, the output of the resistor R87 is connected to the noninverting input of the first amplifier IC1A, the collector of the transistor Q1 is connected to the output of the first amplifier IC1A, and the emitter of the transistor Q1 is connected to the ground.

4. A gas volumetric water heater circuit according to claim 2, characterised in that, The output of the first amplifier IC1A is also connected with the input of a resistor R5, the output of the resistor R5 is also connected with a capacitor C2 and a capacitor C6, and the other ends of the capacitor C2 and the capacitor C6 are commonly connected to the ground.

5. The gas volumetric water heater circuit of claim 1, wherein, The feedback circuit (21) includes a resistor R21, the FJCS port of the main control circuit (1) is connected with the input of the resistor R21, and the output of the resistor R21 is connected with the FG port of the fan.

6. A gas volumetric water heater circuit according to claim 5, characterised in that, The feedback circuit (21) is also connected with feedback on-off circuit (24), the feedback on-off circuit (24) includes a transistor Q4, the base of the transistor Q4 is connected to the FG port of the fan, the collector of the transistor Q4 is connected to the FJCS port of the main control circuit (1), and the emitter of the transistor Q4 is connected to the ground.

7. The gas volumetric water heater circuit of claim 1, wherein, The GND port of the fan is connected with the noninverting input of a second amplifier IC1B, the output of the second amplifier IC1B is connected to the FJIS port of the main control circuit (1), the inverting input of the second amplifier IC1B is connected with a resistor R35, the output of the resistor R35 is connected to the ground, and the output of the second amplifier IC1B is connected in parallel with the inverting output of the second amplifier IC1B with a resistor R33 and a capacitor C39.

8. A gas volumetric water heater circuit according to claim 7, characterised in that, The second amplifier IC1B is connected with the input end of the resistance R25, the output end of the resistance R25 is connected with the input end of the resistance R2, the output end of the resistance R26 is connected with the positive pole of the diode D2, the negative pole of the diode D2 is connected with the power supply, the resistance R25 and the resistance R26 are further connected with the capacitor C34, the other end of the capacitor C34 is connected with the ground, the positive pole of the diode D2 is connected with the capacitor C36, the other end of the capacitor C36 is connected with the ground.

9. The gas volumetric water heater circuit of claim 1, wherein, The power supply circuit (3) comprises a first voltage reduction circuit (31), the first voltage reduction circuit (31) comprises a first voltage reduction chip IC3, the VIN port of the first voltage reduction chip IC3 is connected with the power supply and connected with the capacitor C45 and the electrolytic capacitor E6, the other end of the capacitor C45 and the electrolytic capacitor E6 are commonly connected with the ground, the output end of the first voltage reduction chip IC3 is connected with the inductor L2, the output end of the inductor L2 is connected with the main control circuit (1).

10. The gas volumetric water heater circuit of claim 1, wherein, The communication circuit (4) comprises a communication chip IC5, the input end of the communication chip IC5 is connected with the output end of the main control circuit (1), the A port of the communication chip IC5 is connected with the patch resistance F4, the output end of the patch resistance F4 is connected with the Wi-Fi module, the B port of the communication chip IC5 is connected with the patch resistance F5, the output end of the patch resistance F5 is connected with the Wi-Fi module.

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