Power supply circuit of gas equipment and gas equipment

Abstract

The present application provides a power supply circuit of a gas equipment and a gas equipment. The power supply circuit of a gas equipment comprises: a circuit board, the circuit board having a power ground and a signal ground; a first power supply circuit, which is disposed on the circuit board, an input end of the first power supply circuit being used for connecting an alternating current power supply terminal, the first power supply circuit comprising a first capacitor and a second capacitor, and a first end of the first capacitor being connected to a second end of the second capacitor and then being connected to the power ground; a rectifying circuit, which is disposed on the circuit board, an input end of the rectifying circuit being connected to an output end of the first power supply circuit; a second power supply circuit, which is disposed on the circuit board, an input end of the second power supply circuit being connected to an output end of the rectifying circuit, and the second power supply circuit being connected to the signal ground; and a component, which is disposed on the circuit board, connecting to the power ground and the signal ground. In said process, by directly performing communication testing on the loop in which the component is located, testing whether the power ground and the signal ground are in communication may be completed on the production line. The defect in the related technical solution that testing whether communication between a power ground and a signal ground is abnormal cannot be directly performed on a production line is overcome, thereby reducing the probability of a gas equipment malfunctioning due to a grounding anomaly. In addition, it is ensured that the gas equipment is able to meet the design requirement of electromagnetic interference, and the reliability of the gas equipment is ensured.

Description

Power supply circuits for gas equipment and gas equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 20, 2023, with application number "202310894243.3" and titled "Power supply circuit and gas equipment for gas equipment", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of circuit technology, and in particular to a power supply circuit for gas equipment and gas equipment. Background Art

[0003] For gas equipment, it is necessary to check whether the ground connection is abnormal before leaving the factory. If the grounding is normal, the gas equipment can meet the design requirements of electromagnetic interference.

[0004] Specifically, under normal grounding conditions, the power ground in the gas equipment is riveted to the outer casing of the gas equipment to achieve grounding, and the signal ground of the gas equipment is connected through a common terminal and then riveted to the outer casing of the gas equipment to achieve grounding. The outer casing of the equipment uses its own conductive properties to achieve connectivity between the power ground and the signal ground.

[0005] However, it is impossible to directly detect whether the connectivity between the power ground and the signal ground is abnormal on the production line. Therefore, after leaving the factory, the gas equipment produced may become defective due to abnormal grounding. In other words, the gas equipment does not meet the design requirements for electromagnetic interference, which may lead to a recall of defective products.

[0006] Summary of the Invention

[0007] This application aims to solve at least one of the technical problems existing in the prior art or related art.

[0008] To this end, a first aspect of the present application is to provide a power supply circuit for a gas appliance.

[0009] A second aspect of the present application is to provide a gas device.

[0010] In view of this, according to the first aspect of the present application, the present application provides a power supply circuit for gas equipment, including: a circuit board, the circuit board having a power ground and a signal ground; a first power supply circuit, provided on the circuit board, the input end of the first power supply circuit is used to connect to alternating current, the first power supply circuit includes a first capacitor and a second capacitor, the first end of the first capacitor and the second end of the second capacitor are connected to the power ground; a rectifier circuit, provided on the circuit board, the input end of the rectifier circuit is connected to the output end of the first power supply circuit; a second power supply circuit, provided on the circuit board, the input end of the second power supply circuit is connected to the output end of the rectifier circuit, and the second power supply circuit is connected to the signal ground; components, provided on the circuit board, connected to the power ground and the signal ground.

[0011] In some technical solutions, the components include: a capacitor; or a first resistor; or a plurality of second resistors, and the plurality of second resistors are connected in series or in parallel.

[0012] In some technical solutions, the gas device includes a shell, and the power supply circuit further includes: a first connecting wire connecting the power ground and the shell.

[0013] In some technical solutions, the first power supply circuit includes: a first common-mode inductor, a first end of the first common-mode inductor is connected to the first end of the second capacitor, a second end of the first common-mode inductor is connected to the first input end of the rectifier circuit, a third end of the first common-mode inductor is connected to the second end of the first capacitor, and a fourth end of the first common-mode inductor is connected to the second input end of the rectifier circuit; an AC connection terminal, a first port of the AC connection terminal is connected to the third end of the first common-mode inductor, and a second port of the AC connection terminal is connected to the first end of the first common-mode inductor.

[0014] In some technical solutions, the first power supply circuit further includes: a third capacitor, a first end of the third capacitor is connected to the first end of the second capacitor, and a second end of the third capacitor is connected to the second end of the first capacitor.

[0015] In some technical solutions, the first power supply circuit also includes: a second common-mode inductor, located between the first capacitor and the AC connection terminal, the first end of the second common-mode inductor is connected to the second end of the third capacitor, the second end of the second common-mode inductor is connected to the first port of the AC connection terminal, the third end of the second common-mode inductor is connected to the first end of the third capacitor, and the fourth end of the second common-mode inductor is connected to the second port of the AC connection terminal.

[0016] In some technical solutions, the first power supply circuit also includes: a fourth capacitor, the first end of the fourth capacitor is connected to the second end of the second common-mode inductor, and the second end of the fourth capacitor is connected to the fourth end of the second common-mode inductor; and / or a varistor, the first end of the varistor is connected to the second end of the second common-mode inductor, and the second end of the varistor is connected to the fourth end of the second common-mode inductor.

[0017] In some technical solutions, the first power supply circuit further includes: a fuse device connected in series with the first port of the AC connection terminal or connected in series with the second port of the AC connection terminal.

[0018] In some technical solutions, the second power supply circuit includes: a transformer, the primary coil of the transformer is connected to the output end of the rectifier circuit; a first filter circuit, the input end of the first filter circuit is connected to the first secondary coil of the transformer, and the output end of the first filter circuit is connected to the signal ground.

[0019] In some technical solutions, the first filtering circuit includes: a first electrolytic capacitor connected to both ends of the first secondary coil; and / or a fifth capacitor connected to both ends of the first secondary coil.

[0020] In some technical solutions, the second power supply circuit further includes: a diode located between the first secondary coil and the first electrolytic capacitor.

[0021] In some technical solutions, the second power supply circuit also includes: a second filtering circuit, located between the primary coil of the transformer and the output end of the rectifier circuit, the second filtering circuit including: a second electrolytic capacitor, the first end of the second electrolytic capacitor is connected to the first end of the primary coil, and the second end of the second electrolytic capacitor is connected to the power ground; and / or a sixth capacitor, the first end of the sixth capacitor is connected to the first end of the primary coil, and the second end of the sixth capacitor is connected to the power ground.

[0022] According to a second aspect of the present application, the present application provides a gas device, including: a power supply circuit of any of the gas devices described above.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] FIG1 shows a topological diagram of a power supply circuit of a gas appliance in an embodiment of the present application;

[0026] FIG2 shows a circuit diagram of a power supply circuit of a gas appliance in an embodiment of the present application.

[0027] Among them, the correspondence between the figure marks and component names in Figure 1 and Figure 2 is: 100 circuit board, GND power ground, SGND signal ground, 102 first power supply circuit, C1 first capacitor, C2 second capacitor, BD rectifier circuit, 104 second power supply circuit, 106 components, 108 shell, 110 first connecting wire, LF1 first common mode inductor, CN AC connection terminal, C3 third capacitor, LF2 second common mode inductor, C4 fourth capacitor, VR varistor, F fuse, T transformer, 112 first filter circuit, EC1 first electrolytic capacitor, C5 fifth capacitor, D diode, 114 second filter circuit, EC2 second electrolytic capacitor, C6 sixth capacitor. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above aspects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0030] In one embodiment of the present application, as shown in Figures 1 and 2, a power supply circuit for a gas device is provided, including: a circuit board 100, the circuit board 100 having a power ground GND and a signal ground SGND; a first power supply circuit 102, provided on the circuit board 100, the input end of the first power supply circuit 102 being used to connect to an AC power supply terminal, the first power supply circuit 102 including a first capacitor C1 and a second capacitor C2, the first end of the first capacitor C1 and the second end of the second capacitor C2 being connected to the power ground GND; a rectifier circuit BD, provided on the circuit board 100, the input end of the rectifier circuit BD being connected to the output end of the first power supply circuit 102; a second power supply circuit 104, provided on the circuit board 100, the input end of the second power supply circuit 104 being connected to the output end of the rectifier circuit BD, and the second power supply circuit 104 being connected to the signal ground SGND; and a component 106, provided on the circuit board 100, connected to the power ground GND and the signal ground SGND.

[0031] An embodiment of the present application provides a power supply circuit for a gas appliance, in which the power ground GND and the signal ground SGND can be connected in the power supply circuit.

[0032] During this process, by directly performing a connectivity check on the circuit where component 106 is located, the connectivity check between the power ground GND and the signal ground SGND can be completed on the production line. This overcomes the drawback of related embodiments where the connectivity between the power ground GND and the signal ground SGND cannot be directly checked on the production line. This reduces the probability of gas equipment malfunctions due to grounding anomalies, and simultaneously ensures that the gas equipment meets electromagnetic interference design requirements, thereby ensuring the reliability of the gas equipment.

[0033] The embodiments of the present application are implemented based on the following principles. Specifically, the circuit board 100 has a power ground GND and a signal ground SGND, so that the circuits arranged on the circuit board 100 can be grounded by connecting to the power ground GND and the signal ground SGND.

[0034] The first power supply circuit 102 is located on the input side of the rectifier circuit BD and can be understood as supplying power to the rectifier circuit BD. The second power supply circuit 104 is located on the output side of the rectifier circuit BD and can be understood as the output of the rectifier circuit BD. The first capacitor C1 and the second capacitor C2 are the connection points in the first power supply circuit 102 that need to be connected to the power ground GND. Component 106 is provided to connect the power ground GND and the signal ground SGND, and to limit the current flowing from the signal ground SGND to the power ground GND, thereby ensuring the safe use of the gas equipment.

[0035] In some embodiments, the rectifier circuit BD is a rectifier bridge.

[0036] In some implementations, the component 106 includes: a capacitor; or a first resistor; or a plurality of second resistors, where the plurality of second resistors are connected in series or in parallel.

[0037] In this embodiment, the selection of component 106 is limited. In this embodiment, the power supply circuit can select component 106 as a resistor according to actual use needs, such as a single first resistor, so as to limit the current flowing from the signal ground SGND to the power ground GND.

[0038] In the above embodiment, the power supply circuit can select the component 106 as a capacitor according to actual use requirements, thereby meeting actual use design requirements.

[0039] In the above embodiment, the component 106 can also be a circuit composed of multiple second resistors, such as a resistance circuit in which multiple resistors are connected in series, or a resistance circuit formed by multiple second resistors in parallel. It can be selected according to the actual design requirements of the power supply circuit of the gas equipment and will not be elaborated here.

[0040] In the above embodiment, the resistance value or capacitance value of the first resistor, the capacitor, and the plurality of second resistors can be determined according to actual use requirements, and will not be further elaborated here.

[0041] In some embodiments, the gas device includes a housing 108 , and the power supply circuit further includes: a first connecting wire 110 connecting a power ground GND and the housing 108 .

[0042] In this embodiment, a first connecting wire 110 is provided to directly connect the power ground GND to the gas appliance housing 108, thereby achieving grounding of the power ground GND. During the above grounding process, grounding detection can be performed on the production line, thereby ensuring the reliability of the gas appliance grounding.

[0043] In some embodiments, the first connecting wire 110 may be a wire printed on the circuit board 100 . In this case, the first connecting wire 110 may be connected to the housing 108 by riveting.

[0044] In some embodiments, the first connecting wire 110 may be an independent wire. In this case, one end of the first connecting wire 110 is welded to the power ground GND, and the other end of the first connecting wire 110 is riveted to the housing 108 .

[0045] In some embodiments, the housing 108 is a metal housing.

[0046] In some embodiments, the first power supply circuit 102 includes: a first common-mode inductor LF1, a first end of the first common-mode inductor LF1 is connected to the first end of the second capacitor C2, a second end of the first common-mode inductor LF1 is connected to the first input end of the rectifier circuit BD, a third end of the first common-mode inductor LF1 is connected to the second end of the first capacitor C1, and a fourth end of the first common-mode inductor LF1 is connected to the second input end of the rectifier circuit BD; an AC connection terminal CN, a first port of the AC connection terminal CN is connected to the third end of the first common-mode inductor LF1, and a second port of the AC connection terminal CN is connected to the first end of the first common-mode inductor LF1.

[0047] In this embodiment, the first common-mode inductor LF1 is provided so as to suppress the common-mode signal in the AC power inputted by the AC connection terminal CN, thereby ensuring the normal operation of the power supply circuit of the gas equipment and reducing the influence of electromagnetic interference.

[0048] Among them, when the number of turns and current of the coil wound on the magnetic core of the first common-mode inductor LF1 remain unchanged, the more magnetic lines of force passing through the magnetic core, the greater the magnetic flux, and the correspondingly greater the inductance. The first common-mode inductor LF1 prevents changes in the current flowing through it, and its essence is to prevent changes in its magnetic flux, thereby realizing the use of common-mode inductance to suppress common-mode current.

[0049] In some embodiments, the first power supply circuit 102 further includes: a third capacitor C3 , wherein a first end of the third capacitor C3 is connected to a first end of the second capacitor C2 , and a second end of the third capacitor C3 is connected to a second end of the first capacitor C1 .

[0050] In this embodiment, the third capacitor C3 is provided so as to utilize the third capacitor C3 to filter the input alternating current.

[0051] In the above embodiment, the third capacitor C3 can be a safety capacitor. In this embodiment, the third capacitor C3 will not cause electric shock in the event of capacitor failure, thereby improving the safety of the first power supply circuit 102 and the safety of the power supply circuit of the gas circuit.

[0052] In some embodiments, the first power supply circuit 102 further includes: a second common-mode inductor LF2, located between the first capacitor C1 and the AC connection terminal CN, a first end of the second common-mode inductor LF2 connected to the second end of the third capacitor C3, a second end of the second common-mode inductor LF2 connected to the first port of the AC connection terminal CN, a third end of the second common-mode inductor LF2 connected to the first end of the third capacitor C3, and a fourth end of the second common-mode inductor LF2 connected to the second port of the AC connection terminal CN.

[0053] In this embodiment, the second common-mode inductor LF2 is provided so that it and the first common-mode inductor LF1 can form a two-stage processing solution. In this process, the processing effect of the common-mode inductor can be improved.

[0054] In some embodiments, the inductance of the second common-mode inductor LF2 is different from the inductance of the first common-mode inductor LF1 .

[0055] In this embodiment, by selecting two common-mode inductors with different inductance values ​​to construct a two-stage processing solution, filtering in different filtering frequency bands can be achieved, thereby achieving the effect of suppressing common-mode current.

[0056] In some embodiments, the inductance of the second common-mode inductor LF2 is the same as the inductance of the first common-mode inductor LF1 .

[0057] In some embodiments, the first power supply circuit 102 further includes: a fourth capacitor C4, a first end of the fourth capacitor C4 is connected to the second end of the second common-mode inductor LF2, and a second end of the fourth capacitor C4 is connected to the fourth end of the second common-mode inductor LF2; and / or a varistor VR, a first end of the varistor VR is connected to the second end of the second common-mode inductor LF2, and a second end of the varistor VR is connected to the fourth end of the second common-mode inductor LF2.

[0058] In this embodiment, the varistor VR is a voltage-limiting component that is sensitive to voltage changes. By providing the varistor VR, it is used to limit the voltage input to the second common-mode inductor LF2, absorbing voltage surges in the AC power. This reduces significant fluctuations in the voltage input to the second common-mode inductor LF2 and ensures that the amplitude of the AC power output to the second common-mode inductor LF2 remains within the required design range. This ensures that the first common-mode inductor LF1 can operate normally and ensures the stability of the power output by the first power supply circuit 102.

[0059] In the above embodiment, the resistance value of the varistor VR can be determined according to actual use requirements, which will not be described in detail here.

[0060] In the above embodiment, the fourth capacitor C4 is provided so as to filter the input AC power.

[0061] In the above embodiment, the fourth capacitor C4 can be a safety capacitor. In this embodiment, the fourth capacitor C4 will not cause electric shock in the event of capacitor failure, thereby improving the safety of the first power supply circuit 102 and the safety of the power supply circuit of the gas circuit.

[0062] In some embodiments, the first power supply circuit 102 further includes: a fuse device F connected in series with the first port of the AC connection terminal CN or connected in series with the second port of the AC connection terminal CN.

[0063] In this embodiment, a fuse device F is provided so as to limit the operating current in the first power supply circuit 102. When the operating current in the first power supply circuit 102 is too large, the fuse device F is used to cut off the operation of the first power supply circuit 102, thereby reducing the probability of damage to the first power supply circuit 102 due to overcurrent, thereby improving the reliability of the first power supply circuit 102.

[0064] While improving the reliability of the first power supply circuit 102, the reliability of the power supply circuit of the gas equipment is also improved.

[0065] In some embodiments, the fuse device F is a fuse.

[0066] In some embodiments, the second power supply circuit 104 includes: a transformer T, the primary coil of the transformer T is connected to the output end of the rectifier circuit BD; a first filter circuit 112, the input end of the first filter circuit 112 is connected to the first secondary coil of the transformer T, and the output end of the first filter circuit 112 is connected to the signal ground SGND.

[0067] In this embodiment, a transformer T is provided so as to convert the power outputted by the rectifier circuit BD into power of other voltages by the transformer T, and then output the power to the load by the first filter circuit 112 .

[0068] In this process, the setting of the transformer T can achieve output of power supplies with different voltages, thereby providing different power supplies for different loads.

[0069] In the above embodiment, the first filtering circuit 112 is provided so as to utilize the first filtering circuit 112 to filter the power supply output by the secondary coil of the transformer T, so as to reduce high-frequency interference and / or low-frequency interference in the power supply output by the secondary coil of the transformer T, which may affect the normal operation of the load.

[0070] By providing the first filter circuit 112 , the stability of the power output by the second power supply circuit 104 is improved.

[0071] In some embodiments, the transformer T is a step-up transformer or a step-down transformer, which can be selected according to actual use needs and will not be described in detail here.

[0072] In some embodiments, the first filtering circuit 112 includes: a first electrolytic capacitor EC1 connected to both ends of the first secondary coil; and / or a fifth capacitor C5 connected to both ends of the first secondary coil.

[0073] In this embodiment, when the first filtering circuit 112 includes the first electrolytic capacitor EC1, the first electrolytic capacitor EC1 can be used to eliminate high-frequency interference, thereby reducing the impact of high-frequency interference on the control of the gas equipment, thereby improving the reliability of the operation of the gas equipment using the power supply circuit of the gas equipment.

[0074] In the above embodiment, when the first filtering circuit 112 includes the fifth capacitor C5, the fifth capacitor C5 can be used to eliminate low-frequency interference, thereby reducing the impact of low-frequency interference on the control of the gas equipment, thereby improving the reliability of the operation of the gas equipment using the power supply circuit of the gas equipment.

[0075] In some embodiments, the first filtering circuit 112 includes a first electrolytic capacitor EC1.

[0076] In some embodiments, the first filtering circuit 112 includes a fifth capacitor C5.

[0077] In some embodiments, the first filtering circuit 112 includes both a first electrolytic capacitor EC1 and a fifth capacitor C5 .

[0078] In some embodiments, the second power supply circuit 104 further includes a diode D located between the first secondary coil and the first electrolytic capacitor EC1.

[0079] In this embodiment, a diode D is provided to rectify the power output by the transformer T using the diode D, so as to provide power to the first filter circuit 112 .

[0080] In the above embodiment, the anode of the diode D is connected to the secondary winding, and the cathode of the diode D is connected to the first electrolytic capacitor EC1.

[0081] In some embodiments, the second power supply circuit 104 also includes: a second filtering circuit 114, located between the primary coil of the transformer T and the output end of the rectifier circuit BD, the second filtering circuit 114 includes: a second electrolytic capacitor EC2, the first end of the second electrolytic capacitor EC2 is connected to the first end of the primary coil, and the second end of the second electrolytic capacitor EC2 is connected to the power ground; and / or a sixth capacitor C6, the first end of the sixth capacitor C6 is connected to the first end of the primary coil, and the second end of the sixth capacitor C6 is connected to the power ground.

[0082] In this embodiment, a second filtering circuit 114 is provided to filter the power output by the rectifier circuit BD, so as to reduce high-frequency interference and / or low-frequency interference in the power output by the rectifier circuit BD, which may affect the normal operation of the load.

[0083] In this embodiment, when the second filtering circuit 114 includes a second electrolytic capacitor EC2, the second electrolytic capacitor EC2 can be used to eliminate high-frequency interference, thereby reducing the impact of high-frequency interference on the control of the gas equipment, thereby improving the reliability of the operation of the gas equipment using the power supply circuit of the gas equipment.

[0084] In the above embodiment, when the second filtering circuit 114 includes the sixth capacitor C6, the sixth capacitor C6 can be used to eliminate low-frequency interference, thereby reducing the impact of low-frequency interference on the control of the gas equipment, thereby improving the reliability of the operation of the gas equipment using the power supply circuit of the gas equipment.

[0085] In some embodiments, the second filtering circuit 114 includes a second electrolytic capacitor EC2.

[0086] In some implementations, the second filtering circuit 114 includes a sixth capacitor C6.

[0087] In some embodiments, the second filtering circuit 114 includes both a second electrolytic capacitor EC2 and a sixth capacitor C6.

[0088] In some embodiments, the present application provides a gas device, including: a power supply circuit of any of the gas devices described above.

[0089] In this embodiment, a gas appliance is provided, wherein the gas appliance includes the power supply circuit of the gas appliance described above, and thus has all the beneficial effects of the power supply circuit of the gas appliance described above.

[0090] Specifically, the connection between the power ground and the signal ground can be achieved in the power supply circuit.

[0091] During this process, direct connectivity testing of the component circuits allows for on-line verification of the power and signal ground connections. This overcomes the drawback of related technical solutions, which prevent direct on-line verification of abnormal connectivity between the power and signal grounds. This reduces the likelihood of gas equipment malfunctions due to grounding anomalies, while ensuring that the gas equipment meets electromagnetic interference design requirements and maintains reliability.

[0092] The technical solution of the present application is implemented based on the following principles. Specifically, the circuit board has a power ground and a signal ground, so that the circuits arranged on the circuit board can be grounded by connecting to the power ground and the signal ground.

[0093] The first power supply circuit is located on the input side of the rectifier circuit and can be understood as the power supply of the rectifier circuit. The second power supply circuit is located on the output side of the rectifier circuit and can be understood as the output of the rectifier circuit. The first capacitor and the second capacitor are connection points in the first power supply circuit that need to be connected to the power ground. By providing components, the power ground and the signal ground are connected by components, and the current flowing from the signal ground to the power ground is limited, thereby ensuring the safe use of the gas equipment.

[0094] In some embodiments, the rectifier circuit is a rectifier bridge.

[0095] In some embodiments, the gas appliance may be a gas stove or a gas water heater.

[0096] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. In the text of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the connected objects.

[0097] In the claims, specification and drawings of this application, the term "plurality" refers to two or more. Unless otherwise expressly defined, the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. They are intended only to more conveniently describe this application and simplify the description process, and are not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions should not be understood as limiting this application. The terms "connect," "install," and "fix" should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0098] In the claims, specification, and drawings of this application, the terms "one embodiment," "some embodiments," "a specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In the claims, specification, and drawings of this application, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0099] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A power supply circuit for a gas appliance, wherein: include: A circuit board, wherein the circuit board has a power ground and a signal ground; A first power supply circuit is provided on the circuit board, wherein an input end of the first power supply circuit is used to connect to an alternating current, the first power supply circuit comprises a first capacitor and a second capacitor, and a first end of the first capacitor and a second end of the second capacitor are connected to the power ground after being connected; A rectifier circuit is provided on the circuit board, and an input end of the rectifier circuit is connected to an output end of the first power supply circuit; A second power supply circuit is provided on the circuit board, an input end of the second power supply circuit is connected to an output end of the rectifier circuit, and the second power supply circuit is connected to the signal ground; Components are arranged on the circuit board and connected to the power ground and the signal ground.

2. The power supply circuit of the gas equipment according to claim 1, wherein: The components include: Capacitor; or a first resistor; or A plurality of second resistors are connected in series or in parallel.

3. The power supply circuit of the gas equipment according to claim 1, wherein: The gas device comprises a housing, and the power supply circuit of the gas device further comprises: The first connecting wire connects the power ground and the shell.

4. The power supply circuit of the gas equipment according to any one of claims 1 to 3, wherein: The first power supply circuit comprises: a first common-mode inductor, wherein a first end of the first common-mode inductor is connected to a first end of the second capacitor, a second end of the first common-mode inductor is connected to a first input end of the rectifier circuit, a third end of the first common-mode inductor is connected to a second end of the first capacitor, and a fourth end of the first common-mode inductor is connected to a second input end of the rectifier circuit; An AC connection terminal, wherein a first port of the AC connection terminal is connected to the third end of the first common-mode inductor, and a second port of the AC connection terminal is connected to the first end of the first common-mode inductor.

5. The power supply circuit of the gas equipment according to claim 4, wherein: The first power supply circuit further includes: A third capacitor, a first end of the third capacitor is connected to the first end of the second capacitor, and the third capacitor The second end of is connected to the second end of the first capacitor.

6. The power supply circuit of the gas equipment according to claim 5, wherein: The first power supply circuit further includes: A second common-mode inductor is located between the first capacitor and the AC connection terminal, a first end of the second common-mode inductor is connected to the second end of the third capacitor, a second end of the second common-mode inductor is connected to the first port of the AC connection terminal, a third end of the second common-mode inductor is connected to the first end of the third capacitor, and a fourth end of the second common-mode inductor is connected to the second port of the AC connection terminal.

7. The power supply circuit of the gas equipment according to claim 6, wherein: The first power supply circuit further includes: a fourth capacitor, wherein a first end of the fourth capacitor is connected to the second end of the second common-mode inductor, and a second end of the fourth capacitor is connected to a fourth end of the second common-mode inductor; and / or A varistor, wherein a first end of the varistor is connected to a second end of the second common-mode inductor, and a second end of the varistor is connected to a fourth end of the second common-mode inductor.

8. The power supply circuit of the gas equipment according to claim 4, wherein: The first power supply circuit further includes: A fuse device is connected in series with the first port of the AC connection terminal or connected in series with the second port of the AC connection terminal.

9. The power supply circuit of the gas equipment according to any one of claims 1 to 3, wherein: The second power supply circuit comprises: A transformer, wherein the primary coil of the transformer is connected to the output end of the rectifier circuit; A first filter circuit, wherein an input end of the first filter circuit is connected to the first secondary coil of the transformer, and an output end of the first filter circuit is connected to the signal ground.

10. The power supply circuit of the gas equipment according to claim 9, wherein: The first filtering circuit comprises: a first electrolytic capacitor connected to both ends of the first secondary coil; and / or A fifth capacitor is connected to both ends of the first secondary coil.

11. The power supply circuit of the gas equipment according to claim 10, wherein: The second power supply circuit further includes: A diode is located between the first secondary coil and the first electrolytic capacitor.

12. The power supply circuit of the gas equipment according to claim 9, wherein: The second power supply circuit further includes: A second filter circuit is located between the primary coil of the transformer and the output end of the rectifier circuit, and the second filter circuit includes: A second electrolytic capacitor, wherein a first end of the second electrolytic capacitor is connected to a first end of the primary coil, The second end of the second electrolytic capacitor is connected to the power ground; and / or A sixth capacitor, wherein a first end of the sixth capacitor is connected to the first end of the primary coil, and a second end of the sixth capacitor is connected to a power ground line.

13. A gas appliance, wherein: include: A power supply circuit for a gas appliance as claimed in any one of claims 1 to 12.

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