Control system of gas heater and gas heater

Abstract

The utility model relates to gas heating equipment technical field discloses the control system and gas heating device of gas heating device, the utility model discloses: fan motor, power generation module, including generator and rectifier unit, fan motor drives generator rotation, and the power generation output end of generator is connected with the input of rectifier unit, solenoid valve control module, including first transistor and first relay, the input of first transistor is connected with power supply, and the output of first transistor is connected with the control coil of first relay, and the control end of first transistor is connected with the output of rectifier unit, and the switch of first relay is connected with the solenoid valve of gas heating device, and the solenoid valve is used for controlling the gas supply of gas heating device, when the generator output voltage is greater than or equal to the preset voltage, first transistor conduction, the switch of first relay closes, and the solenoid valve is powered on. To realize the replacement of voltage control to centrifugal switch, improve the reliability of gas heating device combustion control.

Description

Technical Field

[0001] This utility model relates to the field of gas heating equipment technology, and in particular to a control system and a gas heater. Background Technology

[0002] To ensure that the switch releasing gas into the combustion chamber is triggered only after the motor of a high-power gas heater has started running, a centrifugal switch is typically installed on the motor. The motor's rotation drives the attached centrifugal switch to activate at its rated speed, thereby controlling the solenoid valve to open and release gas into the combustion chamber. However, mechanical centrifugal switches suffer from low stability and short lifespan, and are prone to failure after prolonged use due to contact wear and other reasons, leading to reduced reliability in the combustion control of the gas heater. Summary of the Invention

[0003] The first technical problem solved by this utility model is to provide a control system for a gas heater, which effectively solves the problems of low stability, short service life, and easy failure of centrifugal switches, which lead to a decrease in the reliability of combustion control of gas heaters.

[0004] The second technical problem solved by this utility model is to provide a gas heater that effectively solves the problems of low stability, short service life, and easy failure of centrifugal switches, which lead to a decrease in the reliability of combustion control of gas heaters.

[0005] The first technical problem mentioned above is solved by the following technical solution: A control system for a gas heater includes: Fan motor; The power generation module includes a generator and a rectifier unit. The fan motor drives the generator to rotate, and the generator's output terminal is connected to the rectifier unit's input terminal. The solenoid valve control module includes: a first transistor and a first relay; The input terminal of the first transistor is connected to the power supply, the output terminal of the first transistor is connected to the control coil of the first relay, and the control terminal of the first transistor is connected to the output terminal of the rectifier unit. The switch of the first relay is connected to the solenoid valve of the gas heater, wherein the solenoid valve is used to control the gas supply to the gas heater. When the generator's output voltage is greater than or equal to the preset voltage, the first transistor is turned on, the first relay is closed, and the solenoid valve is energized and opened.

[0006] Compared with the prior art, the control system of the gas heater described in this utility model has the following advantages: a generator is used to replace the centrifugal switch. The generator is driven by the fan motor of the gas heater itself. At the same time, a first transistor is used in conjunction with the generator to control the first relay of the solenoid valve. When the output voltage of the generator is greater than or equal to the preset voltage, the first transistor is turned on, the first relay is closed, and the solenoid valve is energized and opened. This replaces the mechanical control of the centrifugal switch with a more stable and reliable voltage control, improves the reliability of the solenoid valve control, and thus improves the reliability of the combustion control of the gas heater.

[0007] In one embodiment, the system further includes a control unit and a flame sensor, and the solenoid valve control module further includes a second transistor; The input terminal of the second transistor is connected to the power supply, the output terminal of the second transistor is connected to the input terminal of the first transistor, and the control terminal of the second transistor is connected to the first port of the control unit. The second port of the control unit is connected to the flame sensor to receive the flame ion detection signal detected by the flame sensor; The first port of the control unit is used to control the on / off state of the second transistor based on the flame ion detection signal detected by the flame sensor, thereby controlling the on / off state of the first transistor.

[0008] In one embodiment, the system further includes an ignition control module; One end of the ignition control module is connected to the third port of the control unit, and the other end is connected to the ignition controller of the gas heater.

[0009] In one embodiment, the ignition control module includes a second relay; The control coil of the second relay is connected to the third port of the control unit, and the switch of the second relay is connected to the ignition controller of the gas heater.

[0010] In one embodiment, the fourth port of the control unit is connected to the output terminal of the rectifier unit for detecting the output voltage of the rectifier unit; The first port of the control unit is used to control the switching on and off of the second transistor based on the output voltage of the rectifier unit, thereby controlling the switching on and off of the first transistor.

[0011] In one embodiment, the rectifier unit includes a first diode, a second diode, a third diode, and a fourth diode; The first end of the first diode is connected to the first end of the second diode and grounded, and the second end is connected to the first end of the third diode and the first output terminal of the generator, respectively. The second terminal of the second diode is connected to the first terminal of the fourth diode and the second output terminal of the generator, respectively. The second terminal of the third diode is connected to the second terminal of the fourth diode and the control terminal of the first transistor, respectively.

[0012] In one embodiment, the power generation module further includes voltage divider resistors; One end of the voltage divider resistor is connected to the output terminal of the rectifier unit, and the other end is connected to the control terminal of the first transistor.

[0013] In one embodiment, the power generation module further includes a filter capacitor; One end of the filter capacitor is connected to the output terminal of the rectifier unit and the control terminal of the first transistor, respectively, and the other end is grounded.

[0014] In one embodiment, the generator is a DC brushless generator.

[0015] The second technical problem mentioned above is solved by the following technical solution: A gas heater, comprising a control system for any of the gas heaters described above. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the control system of a gas heater provided in an embodiment of the present invention; Figure 2 This is a circuit diagram of a control system for a gas heater provided in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Power generation module; 11. Rectifier unit; 2. Solenoid valve control module; 3. Control unit; 4. Flame sensor; 5. Ignition control module. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] To ensure that the switch releasing gas into the combustion chamber is triggered only after the motor of a high-power gas heater has started running, a centrifugal switch is typically installed on the motor. The motor's rotation drives the attached centrifugal switch to activate at its rated speed, thereby controlling the solenoid valve to open and release gas into the combustion chamber. However, mechanical centrifugal switches suffer from low stability and short lifespan, and are prone to failure after prolonged use due to contact wear and other reasons, leading to reduced reliability in the combustion control of the gas heater.

[0023] To address the aforementioned technical problems, this utility model provides a control system for a gas heater. It replaces the centrifugal switch with a generator, using the gas heater's own fan motor to drive the generator. Simultaneously, a first transistor works in conjunction with the generator to control a first relay controlling the solenoid valve. When the generator's output voltage is greater than or equal to a preset voltage, the first transistor conducts, the first relay closes, and the solenoid valve is energized and opened. This replaces the mechanical control of the centrifugal switch with a more stable and reliable voltage control, improving the reliability of the solenoid valve control and thus enhancing the reliability of the gas heater's combustion control.

[0024] The following is combined Figures 1 to 2 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, in one aspect, a control system for a gas heater is provided, which is used to link with the combustion system of the gas heater to realize combustion control of the gas heater. Figure 1 This is a schematic diagram of the control system of a gas heater provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the control system of the gas heater includes: a fan motor, a power generation module 1, and a solenoid valve control module 2.

[0026] Specifically, such as Figure 1 As shown, the power generation module 1 includes: a generator and a rectifier unit 11. Although not shown in... Figure 1 As shown, the fan motor drives the generator to rotate. The fan motor can be a single-phase AC motor, and the generator can be a DC brushless generator. The generator's output terminal is connected to the input terminal of the rectifier unit 11, which rectifies the AC power output by the generator into DC power.

[0027] like Figure 1 As shown, the solenoid valve control module 2 includes a first transistor Q1 and a first relay K1. The input terminal of the first transistor Q1 is connected to a power supply, the output terminal of the first transistor Q1 is connected to the control coil of the first relay K1, and the control terminal of the first transistor Q1 is connected to the output terminal of the rectifier unit 11. The switch of the first relay K1 is connected to the solenoid valve of the gas heater, wherein the solenoid valve is used to control the gas supply to the gas heater. Specifically, the output terminal of the first transistor Q1 is connected to the first terminal of the control coil of the first relay K1, and the second terminal is grounded. The first contact of the switch of the first relay K1 is connected to the solenoid valve, and the second contact is grounded.

[0028] In this embodiment, when the generator's output voltage is greater than or equal to a preset voltage, the first transistor Q1 is turned on, the first relay K1 is closed, and the solenoid valve is energized and opened, thereby controlling the gas to enter the combustion chamber of the gas heater and supplying gas to the gas heater. Conversely, when the generator's output voltage is less than the preset voltage, the first transistor Q1 is turned off, the first relay K1 is opened, and the solenoid valve is de-energized and closed, thereby cutting off the gas supply to the gas heater.

[0029] The preset voltage corresponds to the turn-on voltage of the first transistor Q1. When the generator's output voltage is greater than or equal to the preset voltage, the first transistor Q1 is turned on; when the generator's output voltage is less than the preset voltage, the first transistor Q1 is turned off. It should be noted that since the generator outputs alternating current (AC), which is rectified into direct current (DC) by the rectifier unit 11, the generator's output voltage mentioned here actually refers to the magnitude of the generator's output voltage, that is, the magnitude of the DC voltage after rectification by the rectifier unit 11.

[0030] In one specific embodiment, the first transistor Q1 can be a bipolar transistor. Accordingly, the control terminal of the first transistor Q1 corresponds to the base of the bipolar transistor, the output terminal of the first transistor Q1 corresponds to the emitter of the bipolar transistor, and the input terminal of the first transistor Q1 corresponds to the collector of the bipolar transistor.

[0031] In one embodiment, such as Figure 2As shown, the system also includes a flame sensor 4. The second port of the control unit 3 is connected to the flame sensor 4 and is used to receive the flame ionization detection signal detected by the flame sensor 4. Correspondingly, the first port of the control unit 3 is used to control the on / off state of the second transistor Q2 based on the flame ionization detection signal detected by the flame sensor 4, thereby controlling the on / off state of the first transistor Q1.

[0032] In one embodiment, such as Figure 2 As shown, the system also includes an ignition control module 5, one end of which is connected to the third port of the control unit 3, and the other end is connected to the ignition controller of the gas heater to control the combustion of gas in the gas heater.

[0033] In one embodiment, the ignition control module 5 includes a second relay K2, which controls the ignition controller of the gas heater to control the combustion of gas in the gas heater. The control coil of the second relay K2 is connected to the third port of the control unit 3, and the switch of the second relay K2 is connected to the ignition controller of the gas heater. Specifically, the first end of the control coil of the second relay K2 is connected to a power source, and the second end of the control coil is connected to the third port of the control unit 3; the first contact of the switch of the second relay K2 is connected to the ignition controller of the gas heater, and the second contact of the switch is grounded.

[0034] In one embodiment, such as Figure 2 As shown, when a low-level signal is output from the third port of the control unit 3, the switch of the second relay K2 is closed, the ignition controller of the gas heater is powered on and performs the ignition operation; when a high-level signal is output from the third port of the control unit 3, the switch of the second relay K2 is opened, the ignition controller of the gas heater is powered off and stops performing the ignition operation.

[0035] In one embodiment, when the control system starts up, i.e., when the gas heater starts up, the first, second, and third ports of the control unit 3 cooperate to perform a safety check before ignition, preventing false flames that could pose a safety hazard. Specifically, when the control system starts up, the control unit 3 detects the flame ionization detection signal output by the flame sensor through the second port. When the flame ionization detection signal is detected as a high-level signal, meaning no flame is detected, the control unit 3 controls the third port to output a low-level signal, closing the switch of the second relay K2, energizing the ignition controller of the gas heater and performing the ignition operation; the control unit 3 controls the first port to output a high-level signal, turning on the second transistor Q2. If the generator's output voltage is greater than or equal to a preset voltage, the first transistor Q1 turns on, closing the switch of the first relay K1, energizing and opening the solenoid valve of the gas heater. When the flame ion detection signal is low, indicating a false flame, the control unit 3 controls the third port to output a high-level signal, the second relay K2 switches off, the ignition controller of the gas heater is powered off and shuts down, and stops performing the ignition operation; the control unit 3 controls the first port to output a low-level signal, the second transistor Q2 is disconnected, the first transistor Q1 is disconnected, the first relay K1 switches off, and the solenoid valve of the gas heater is powered off and shuts down.

[0036] In one embodiment, such as Figure 2 As shown, the fourth port of the control unit 3 is connected to the output terminal of the rectifier unit 11, and is used to detect the output voltage of the rectifier unit 11, that is, the voltage output by the rectifier unit 11 after rectifying the AC power output from the generator. Correspondingly, the first port of the control unit 3 is used to control the switching on and off of the second transistor Q2 based on the output voltage of the rectifier unit 11, so as to control the switching on and off of the first transistor Q1. As shown in the following formula, the generator output voltage is positively correlated with the generator speed. After the control unit 3 obtains the generator output voltage through the fourth port, it calculates the generator speed based on the generator output voltage, thereby determining whether the generator is operating within the rated speed range.

[0037]

[0038] in, This refers to the induced electromotive force of the generator, which is the generator's output voltage. For motor structure constants, For magnetic flux, This represents the generator's rotational speed.

[0039] In one embodiment, when the generator speed is less than the preset speed, the control unit 3 controls the first port to output a high-level signal to turn on the second transistor Q2, thereby connecting the first transistor Q1 to the power supply. This causes the first relay K1 to close when the generator output voltage is greater than or equal to the preset low voltage, and the solenoid valve to be energized and opened. This maintains the gas supply to the gas heater when the generator is running normally, ensuring the normal operation of the gas heater.

[0040] In one embodiment, when the generator speed is greater than or equal to the preset speed, the control unit 3 controls the first port to output a low-level signal to disconnect the second transistor Q2, thereby disconnecting the first transistor Q1 from the power supply, causing the first transistor Q1 to disconnect, the first relay K1 to disconnect, and the solenoid valve to be de-energized and closed, thereby cutting off the gas supply to the gas heater when the generator exceeds the rated speed, so as to ensure the safe operation of the gas heater.

[0041] In one embodiment, such as Figure 2 As shown, the rectifier unit 11 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, which together form a full-bridge rectifier circuit. Specifically, the first terminal of the first diode D1 is connected to the first terminal of the second diode D2 and grounded; its second terminal is connected to the first terminal of the third diode D3 and the first output terminal of the generator, respectively. The second terminal of the second diode D2 is connected to the first terminal of the fourth diode D4 and the second output terminal of the generator, respectively. The second terminal of the third diode D3 is connected to the second terminal of the fourth diode D4 and the control terminal of the first transistor Q1, respectively.

[0042] In one embodiment, such as Figure 2 As shown, the solenoid valve switching module 1 also includes a voltage divider resistor R1 and a filter capacitor C1. The voltage divider resistor R1 forms a voltage divider with the first transistor Q1, thereby reducing the voltage supplied to the first terminal of the first transistor Q1 to the turn-on voltage of the first transistor Q1, achieving a match with the specifications of the first transistor Q1. One end of the voltage divider resistor R1 is connected to the output terminal of the rectifier unit 11, and the other end is connected to one end of the filter capacitor C1 and the control terminal of the first transistor Q1, respectively. The other end of the filter capacitor C1 is grounded.

[0043] The following combination Figure 1-2 The specific working process of the control system of the gas heater of this utility model is further explained below: like Figure 2As shown, when the generator's output voltage is greater than or equal to a preset voltage, the first transistor Q1 is turned on, the first relay K1 is closed, and the solenoid valve of the gas heater is energized and opened. The solenoid valve controls the gas supply to the gas heater. Conversely, when the output voltage is less than the preset voltage, the first transistor Q1 is turned off, the first relay K1 is opened, and the solenoid valve of the gas heater is de-energized and closed. Thus, by controlling the on / off state of the first transistor Q1 through the generator's output voltage, the on / off state of the first relay K1 is controlled, which in turn controls the opening and closing of the solenoid valve, thereby achieving ignition control of the gas heater.

[0044] In one embodiment, the first port of control unit 3 is connected to the first transistor Q1 via the second transistor Q2. When the first port of control unit 3 outputs a high-level signal, the second transistor Q2 conducts, connecting the first transistor Q1 to the power supply. If the generator's output voltage is greater than or equal to a preset voltage, the first transistor Q1 conducts, the first relay K1 closes, and the solenoid valve of the gas heater is energized and opened. If the generator's output voltage is less than the preset voltage, the first transistor Q1 de-energizes, the first relay K1 opens, and the solenoid valve of the gas heater is de-energized and closed. When the first port of control unit 3 outputs a low-level signal, the second transistor Q2 de-energizes, disconnecting the first transistor Q1 from the power supply. At this time, regardless of whether the generator's output voltage is less than the preset voltage, the first transistor Q1 de-energizes, the first relay K1 opens, and the solenoid valve of the gas heater is de-energized and closed. Therefore, based on the generator's output voltage controlling the on / off state of the first transistor Q1, the control unit 3 further controls the second transistor Q2 to control the on / off state of the first transistor Q1, thereby achieving dual-switch control and protection for the gas heater's ignition control.

[0045] In one embodiment, to ensure the safe start-up of the gas heater, a safety check is performed before ignition to check for the presence of a false flame. If no false flame is detected, the ignition operation is performed. Specifically, when the control system starts, the control unit 3 detects the flame ionization detection signal output by the flame sensor through the second port. When the flame ionization detection signal is detected as a high-level signal, indicating the absence of a false flame, the control unit 3 controls the third port to output a low-level signal, closing the switch of the second relay K2. This energizes the ignition controller of the gas heater and initiates the ignition operation. Simultaneously, the control unit 3 controls the first port to output a high-level signal, turning on the second transistor Q2. When the output voltage is greater than or equal to a preset voltage and the second transistor Q2 is on, the first transistor Q1 turns on, closing the switch of the first relay K1. This energizes and opens the solenoid valve of the gas heater, allowing gas to enter the combustion chamber and enabling the gas heater to ignite.

[0046] Correspondingly, after the control unit 3 detects the flame ion detection signal output by the flame sensor through the second port, when the flame ion detection signal is detected to be a low level signal, i.e. a false flame is detected, the control unit 3 controls the third port to output a high level signal, the switch of the second relay K2 is turned off, and the ignition controller of the gas heater is de-energized and shut down; at the same time, the control unit 3 controls the first port to output a low level signal, the second transistor Q2 is turned off, and when the output voltage is less than the preset voltage, or when the second transistor Q2 is turned off, the first transistor Q1 is turned off, the switch of the first relay K1 is turned off, and the solenoid valve of the gas heater is de-energized and shut down.

[0047] In one embodiment, the control unit 3 monitors the generator speed in real time through the fourth port to ensure that the generator operates within the rated speed range, thereby ensuring the normal and safe operation of the gas heater. Specifically, the control unit 3 detects the output voltage of the rectifier unit 11 through the fourth port and determines the generator speed based on the output voltage. When the generator speed is greater than or equal to the preset speed, the control unit 3 controls the first port to output a low-level signal to disconnect the second transistor Q2. When the output voltage is less than the preset voltage, or when the second transistor Q2 is disconnected, the first transistor Q1 is disconnected, the first relay K1 is disconnected, and the solenoid valve of the gas heater is de-energized and closed to ensure the safe operation of the gas heater.

[0048] Correspondingly, when the generator speed is less than the preset speed, the control unit 3 controls the first port to output a high-level signal, and the second transistor Q2 is turned on. When the output voltage is greater than or equal to the preset voltage and the second transistor Q2 is turned on, the first transistor Q1 is turned on, the switch of the first relay K1 is closed, and the solenoid valve of the gas heater is energized and opened to ensure the normal operation of the gas heater.

[0049] The control system of the gas heater provided in this embodiment of the utility model uses a generator to replace the centrifugal switch. The generator is driven by the fan motor of the gas heater itself. At the same time, a first transistor works with the generator to control the first relay of the solenoid valve. When the output voltage of the generator is greater than or equal to a preset voltage, the first transistor is turned on, the first relay is closed, and the solenoid valve is energized and opened. This replaces the mechanical control of the centrifugal switch with a more stable and reliable voltage control, improves the reliability of the solenoid valve control, and thus improves the reliability of the combustion control of the gas heater.

[0050] According to an embodiment of the present invention, another aspect provides a gas heater, including a control system for the gas heater as described in any of the above embodiments.

[0051] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0052] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A control system for a gas heater, characterized in that, The system includes: Fan motor; The power generation module (1) includes a generator and a rectifier unit (11). The wind turbine motor is used to drive the generator to rotate. The power generation output terminal of the generator is connected to the input terminal of the rectifier unit (11). The solenoid valve control module (2) includes: a first transistor and a first relay; The input terminal of the first transistor is connected to the power supply, the output terminal of the first transistor is connected to the control coil of the first relay, and the control terminal of the first transistor is connected to the output terminal of the rectifier unit (11). The switch of the first relay is connected to the solenoid valve of the gas heater, wherein the solenoid valve is used to control the gas supply to the gas heater; When the output voltage of the generator is greater than or equal to a preset voltage, the first transistor is turned on, the first relay is closed, and the solenoid valve is energized and opened.

2. The system according to claim 1, characterized in that, The system also includes a control unit (3) and a flame sensor (4), and the solenoid valve control module (2) further includes a second transistor; The input terminal of the second transistor is connected to the power supply, the output terminal of the second transistor is connected to the input terminal of the first transistor, and the control terminal of the second transistor is connected to the first port of the control unit (3). The second port of the control unit (3) is connected to the flame sensor (4) and is used to receive the flame ion detection signal detected by the flame sensor (4); The first port of the control unit (3) is used to control the on / off state of the second transistor based on the flame ion detection signal detected by the flame sensor (4), so as to control the on / off state of the first transistor.

3. The system according to claim 2, characterized in that, The system also includes: an ignition control module (5); One end of the ignition control module (5) is connected to the third port of the control unit (3), and the other end is connected to the ignition controller of the gas heater.

4. The system according to claim 3, characterized in that, The ignition control module (5) includes a second relay; The control coil of the second relay is connected to the third port of the control unit (3), and the switch of the second relay is connected to the ignition controller of the gas heater.

5. The system according to claim 2, characterized in that, The fourth port of the control unit (3) is connected to the output terminal of the rectifier unit (11) for detecting the output voltage of the rectifier unit (11); The first port of the control unit (3) is used to control the on / off state of the second transistor based on the output voltage of the rectifier unit (11), so as to control the on / off state of the first transistor.

6. The system according to claim 1, characterized in that, The rectifier unit (11) includes a first diode, a second diode, a third diode, and a fourth diode; Wherein, the first end of the first diode is connected to the first end of the second diode and grounded, and the second end is connected to the first end of the third diode and the first output terminal of the generator respectively; The second terminal of the second diode is connected to the first terminal of the fourth diode and the second output terminal of the generator, respectively. The second terminal of the third diode is connected to the second terminal of the fourth diode and the control terminal of the first transistor, respectively.

7. The system according to claim 1, characterized in that, The power generation module (1) also includes voltage divider resistors; One end of the voltage divider resistor is connected to the output terminal of the rectifier unit (11), and the other end is connected to the control terminal of the first transistor.

8. The system according to claim 7, characterized in that, The power generation module (1) also includes a filter capacitor; One end of the filter capacitor is connected to the output terminal of the rectifier unit (11) and the control terminal of the first transistor, respectively, and the other end is grounded.

9. The system according to any one of claims 1-8, characterized in that, The generator is a DC brushless generator.

10. A gas heater, characterized in that, The control system of the gas heater as described in any one of claims 1-9.

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