CN119341334A

CN119341334A - Power supply circuits for gas equipment and gas equipment

Info

Publication number: CN119341334A
Application number: CN202310894243.3A
Authority: CN
Inventors: 张善俞; 陈烽
Original assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2025-01-21
Also published as: WO2025016134A1

Abstract

The invention provides a power supply circuit of gas equipment and the gas equipment, the power supply circuit of the gas equipment comprises a circuit board, a first power supply circuit, a rectifying circuit, a second power supply circuit and a component, wherein the circuit board is provided with a power ground and a signal ground, the input end of the first power supply circuit is used for being connected with an alternating current power supply terminal, the first power supply circuit comprises a first capacitor and a second capacitor, the first end of the first capacitor and the second end of the second capacitor are connected with the power ground after being connected, the rectifying circuit is arranged on the circuit board, the input end of the rectifying circuit is connected with the output end of the first power supply circuit, the second power supply circuit is arranged on the circuit board, the input end of the second power supply circuit is connected with the output end of the rectifying circuit, the second power supply circuit is connected with the signal ground, and the component is arranged on the circuit board and is connected with the power ground and the signal ground.

Description

Power supply circuit of gas equipment and gas equipment

Technical Field

The invention relates to the technical field of circuits, in particular to a power supply circuit of gas equipment and the gas equipment.

Background

For the gas equipment, detection on whether the grounding connection is abnormal or not is needed before delivery, wherein under the condition that the grounding is normal, the gas equipment can meet the design requirement of electromagnetic interference.

Specifically, under the normal condition of grounding, the power ground in the gas equipment is riveted on the shell of the gas equipment to realize grounding, and after the signal ground of the gas equipment is connected through the common connecting terminal, the shell of the gas equipment is also connected in a riveting mode to realize grounding, wherein the shell of the equipment utilizes the conductive characteristic of the shell to realize the communication between the power ground and the signal ground.

However, it is not possible to directly detect whether the communication between the power supply ground and the signal ground is abnormal on the production line, and therefore, after the produced gas equipment leaves the factory, defective products may be formed due to abnormal grounding, that is, the gas equipment does not meet the design requirement of electromagnetic interference, and recall of the defective products occurs.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the invention provides a power supply circuit for a gas appliance.

In a second aspect of the invention, a gas plant is provided.

In view of the above, according to a first aspect of the present invention, there is provided a power supply circuit of a gas appliance, including a circuit board having a power ground and a signal ground, a first power supply circuit provided on the circuit board, an input terminal of the first power supply circuit being adapted to be connected to an alternating current, the first power supply circuit including a first capacitor and a second capacitor, the first terminal of the first capacitor and a second terminal of the second capacitor being connected to the power ground after being connected, a rectifier circuit provided on the circuit board, an input terminal of the rectifier circuit being connected to an output terminal of the first power supply circuit, a second power supply circuit provided on the circuit board, an input terminal of the second power supply circuit being connected to the output terminal of the rectifier circuit, the second power supply circuit being connected to the signal ground, and a component provided on the circuit board to connect the power ground and the signal ground.

The technical scheme of the application provides a power supply circuit of gas equipment, wherein the power supply circuit can be used for completing the communication between power ground and signal ground.

In the process, the detection of whether the power ground and the signal ground are communicated or not can be realized on the production line by directly carrying out communication detection on the loop where the component is located. The defect that whether the communication between the power ground and the signal ground is abnormal or not cannot be directly carried out on a production line in the related technical scheme is overcome, so that the probability of poor occurrence of gas equipment caused by abnormal grounding is reduced, meanwhile, the design requirement of electromagnetic interference can be met for the gas equipment, and the reliability of the gas equipment is ensured.

The technical solution of the application is based on the principle that, in particular, the circuit board has a power supply ground and a signal ground, so that the circuit provided on the circuit board can be grounded by connection thereto.

The first power supply circuit is located at the input side of the rectifying circuit, which can be understood as power supply of the rectifying circuit, the second power supply circuit is located at the output side of the rectifying circuit, which can be understood as output of the rectifying circuit, and the first capacitor and the second capacitor are connection positions of the first power supply circuit, which need to be connected to the power ground. The components are arranged so as to realize connection of the power supply ground and the signal ground by the components, and limit the current flowing from the signal ground to the power supply ground, thereby ensuring the use safety of the gas equipment.

In some embodiments, the rectifying circuit is a rectifying bridge.

In addition, the power supply circuit of the gas equipment provided by the application has the following additional technical characteristics.

In some technical schemes, optionally, the component comprises 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.

In the technical scheme, the selection of the components is limited, and in the technical scheme, the power supply circuit can select the components as resistors according to actual use requirements, such as a single first resistor, so as to limit the current flowing between the signal ground and the power ground.

In the technical scheme, the power supply circuit can select the components as the capacitor according to actual use requirements, so that the actual use design requirements are met.

In the above technical solution, the component may also be a circuit composed of a plurality of second resistors, for example, a resistor circuit formed by connecting a plurality of resistors in series, or a resistor circuit formed by connecting a plurality of second resistors in parallel, which may be selected according to the actual design requirement of the power supply circuit of the gas device, which is not described herein.

In the above technical solution, the resistance values or capacitance values of the first resistor, the capacitor, and the plurality of second resistors may be taken according to actual use needs, and will not be described herein.

In some embodiments, optionally, the gas device includes a housing, and the power supply circuit further includes a first connection wire connecting the power ground to the housing.

In this solution, the grounding of the power supply ground is achieved by providing a first connecting wire for directly connecting the power supply ground to the housing of the gas appliance. In the grounding process, the grounding detection can be realized on the production line, so that the grounding reliability of the gas equipment is ensured.

In some embodiments, the first connecting wire may alternatively be a wire printed on the circuit board, in which case the first connecting wire may be connected to the housing by riveting.

In some embodiments, the first connecting wire may be a wire that exists independently, in which case one end of the first connecting wire is welded to the power ground, and the other end of the first connecting wire is connected to the housing by riveting.

In some embodiments, optionally, the housing is a metal housing.

In some technical schemes, optionally, the first power supply circuit comprises a first common-mode inductor, an alternating-current connection terminal and a second port, wherein the first end of the first common-mode inductor is connected with the first end of the second capacitor, the second end of the first common-mode inductor is connected with the first input end of the rectifying circuit, the third end of the first common-mode inductor is connected with the second end of the first capacitor, the fourth end of the first common-mode inductor is connected with the second input end of the rectifying circuit, and the first port of the alternating-current connection terminal is connected with the third end of the first common-mode inductor.

In the technical scheme, the first common mode inductor is arranged, so that common mode signals in alternating current input by the alternating current connection terminal are restrained by the first common mode inductor, normal operation of a power supply circuit of the gas equipment is ensured, and the influence of electromagnetic interference is reduced.

When the number of turns and the current of the coil wound on the magnetic core on the first common-mode inductor are unchanged, the more magnetic lines of force passing through the magnetic core are, the larger the magnetic flux is, the larger the corresponding inductance is, and the first common-mode inductor prevents the change of the current flowing through the first common-mode inductor, and actually prevents the change of the magnetic flux, so that the common-mode inductor is used for inhibiting the common-mode current.

In some embodiments, optionally, the first power supply circuit further includes a third capacitor, a first end of the third capacitor is connected to a first end of the second capacitor, and a second end of the third capacitor is connected to a second end of the first capacitor.

In this embodiment, the third capacitor is provided so that the input ac power is filtered by the third capacitor.

In the above technical scheme, the third capacitor may be a safety capacitor, in the technical scheme, the third capacitor does not cause electric shock under the condition that the capacitor fails, so that the safety of the first power supply circuit is improved, and meanwhile, the safety of the power supply circuit of the gas circuit is also improved.

In some technical schemes, optionally, the first power supply circuit further comprises a second common-mode inductor, the second common-mode inductor is located between the first capacitor and the alternating current connection terminal, the first end of the second common-mode inductor is connected with the second end of the third capacitor, the second end of the second common-mode inductor is connected with the first port of the alternating current connection terminal, the third end of the second common-mode inductor is connected with the first end of the third capacitor, and the fourth end of the second common-mode inductor is connected with the second port of the alternating current connection terminal.

In the technical scheme, the second common-mode inductor is arranged so that the second common-mode inductor and the first common-mode inductor can form a two-stage processing scheme, and in the process, the processing effect of the common-mode inductor can be improved.

In some embodiments, optionally, the inductance value of the second common-mode inductor is different from the inductance value of the first common-mode inductor.

In the technical scheme, the two-stage processing scheme is constructed by selecting two common-mode inductors with different inductance values, so that the filtering of different filtering frequency bands can be realized, and the effect of inhibiting common-mode current is achieved.

In some embodiments, optionally, the inductance value of the second common-mode inductor is the same as the inductance value of the first common-mode inductor.

In some technical schemes, optionally, the first power supply circuit further comprises a fourth capacitor, wherein the first end of the fourth capacitor is connected with the second end of the second common-mode inductor, the second end of the fourth capacitor is connected with the fourth end of the second common-mode inductor, and/or a piezoresistor, the first end of the piezoresistor is connected with the second end of the second common-mode inductor, and the second end of the piezoresistor is connected with the fourth end of the second common-mode inductor.

In the technical scheme, the piezoresistor is a voltage limiting element sensitive to voltage change, and the voltage resistor is arranged so as to limit the voltage input to the second common mode inductor by using the piezoresistor, absorb voltage impact in alternating current so as to reduce larger fluctuation of the voltage input to the second common mode inductor, and simultaneously ensure that the amplitude of the alternating current output to the second common mode inductor is in a design requirement range. Therefore, the first common-mode inductor can work under the normal working condition, and the stability of output power supply of the first power supply circuit is ensured.

In the above technical solution, the resistance value of the piezoresistor can be taken according to actual use needs, and no description is repeated here.

In the above technical solution, the fourth capacitor is provided so as to filter the input alternating current by using the fourth capacitor.

In the above technical scheme, the fourth capacitor may be a safety capacitor, in the technical scheme, the fourth capacitor does not cause electric shock under the condition that the capacitor fails, so that the safety of the first power supply circuit is improved, and meanwhile, the safety of the power supply circuit of the gas circuit is also improved.

In some embodiments, the first power supply circuit optionally further comprises a safety device connected in series with the first port of the ac connection terminal or in series with the second port of the ac connection terminal.

In the technical scheme, the safety device is arranged so as to limit the working current in the first power supply circuit by using the safety device, and then the safety device is used for cutting off the operation of the first power supply circuit under the condition that the working current in the first power supply circuit is overlarge, so that the probability of damage of the first power supply circuit due to overcurrent is reduced, and the reliability of the first power supply circuit is improved.

The reliability of the power supply circuit of the gas equipment is improved while the reliability of the first power supply circuit is improved.

In some embodiments, optionally, the safety device is a fuse.

In some technical schemes, optionally, the second power supply circuit comprises a transformer, wherein a primary coil of the transformer is connected with an output end of the rectifying circuit, and a first filter circuit, an input end of the first filter circuit is connected with a first secondary coil of the transformer, and an output end of the first filter circuit is connected with signal ground.

In the technical scheme, the transformer is arranged so that the power supply output by the rectifying circuit is converted into power supply of other voltages by the transformer, and then the power supply is output to the load by the first filter circuit.

In the process, the transformer can be arranged to output power with different voltages, so that different power supplies are provided for different loads.

In the technical scheme, the first filter circuit is arranged so as to filter the power supplied by the secondary coil of the transformer by using the first filter circuit, so that high-frequency interference and/or low-frequency interference existing in the power supplied by the secondary coil of the transformer are reduced, and normal operation of a load is influenced.

By arranging the first filter circuit, the stability of output power supply of the second power supply circuit is improved.

In some technical schemes, optionally, the transformer is a step-up transformer, or may be a step-down transformer, which may be selected according to actual use needs, and will not be described herein.

In some technical schemes, the first filter circuit optionally comprises a first electrolytic capacitor connected with two ends of the first secondary coil and/or a fifth capacitor connected with two ends of the first secondary coil.

In the technical scheme, under the condition that the first filter circuit comprises the first electrolytic capacitor, the first electrolytic capacitor can be utilized to eliminate high-frequency interference, so that the influence of the high-frequency interference on the control of the gas equipment is reduced, and the operation reliability of the gas equipment using the power supply circuit of the gas equipment is improved.

In the above technical solution, when the first filter circuit includes the fifth capacitor, the fifth capacitor may be used to eliminate low-frequency interference, so as to reduce an influence of the low-frequency interference on control of the gas device, thereby improving operational reliability of the gas device using the power supply circuit of the gas device.

In some embodiments, optionally, the first filter circuit includes a first electrolytic capacitor.

In some embodiments, optionally, the first filter circuit includes a fifth capacitor.

In some embodiments, optionally, the first filter circuit includes both a first electrolytic capacitor and a fifth capacitor.

In some embodiments, the second power supply circuit may further include a diode between the first secondary coil and the first electrolytic capacitor.

In this technical solution, the diode is provided to rectify the power output by the transformer by the diode so as to supply power to the first filter circuit.

In the above technical solution, the anode of the diode is connected to the secondary coil, and the cathode of the diode is connected to the first electrolytic capacitor.

In some technical schemes, optionally, the second power supply circuit further comprises a second filter circuit, wherein the second filter circuit is positioned between the primary coil of the transformer and the output end of the rectifying circuit, the second filter circuit comprises a second electrolytic capacitor, a first end of the second electrolytic capacitor is connected with the first end of the primary coil, a second end of the second electrolytic capacitor is connected with the power ground wire, and/or a sixth capacitor, a first end of the sixth capacitor is connected with the first end of the primary coil, and a second end of the sixth capacitor is connected with the power ground wire.

In the technical scheme, the second filter circuit is arranged so that the power supply output by the rectifier circuit is filtered by the second filter circuit, and therefore high-frequency interference and/or low-frequency interference existing in the power supply output by the rectifier circuit are reduced, and normal operation of a load is affected.

In the technical scheme, under the condition that the second filter circuit comprises the second electrolytic capacitor, the second electrolytic capacitor can be utilized to eliminate high-frequency interference, so that the influence of the high-frequency interference on the control of the gas equipment is reduced, and the operation reliability of the gas equipment using the power supply circuit of the gas equipment is improved.

In the above technical solution, when the second filter circuit includes the sixth capacitor, the sixth capacitor may be used to eliminate low-frequency interference, so as to reduce an influence of the low-frequency interference on control of the gas device, thereby improving operational reliability of the gas device using the power supply circuit of the gas device.

In some embodiments, optionally, the second filter circuit includes a second electrolytic capacitor.

In some embodiments, optionally, the second filter circuit includes a sixth capacitor.

In some embodiments, optionally, the second filter circuit includes both a second electrolytic capacitor and a sixth capacitor.

According to a second aspect of the present invention there is provided a gas appliance comprising a power supply circuit for a gas appliance as defined in any one of the above.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 shows a schematic topology diagram of a power supply circuit of a gas appliance in an embodiment of the application;

fig. 2 shows a circuit schematic of a power supply circuit of a gas appliance in an embodiment of the invention.

The correspondence between the reference numerals and the component names in fig. 1 and 2 is:

100 circuit boards, GND power supply ground, SGND signal ground, 102 a first power supply circuit, C1 a first capacitor, C2 a second capacitor, BD rectifying circuit, 104 a second power supply circuit, 106 components, 108 a shell, 110 a first connecting wire, LF 1a first common mode inductance, CN an alternating current connecting terminal, C3 a third capacitor, LF2 a second common mode inductance, C4 a fourth capacitor, VR piezoresistor, F a safety device, T transformer, 112 a first filter circuit, EC 1a first electrolytic capacitor, C5 a fifth capacitor, D diode, 114 a second filter circuit, EC2 a second electrolytic capacitor, C6 a sixth capacitor.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized below, may be had by reference to the appended drawings. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

In one embodiment of the present application, as shown in fig. 1 and 2, a power supply circuit of a gas appliance is provided, which includes 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, an input terminal of the first power supply circuit 102 for connecting an ac power supply terminal, the first power supply circuit 102 including a first capacitor C1 and a second capacitor C2, the first terminal of the first capacitor C1 and the second terminal of the second capacitor C2 being connected to the power ground GND, a rectifying circuit BD provided on the circuit board 100, an input terminal of the rectifying circuit BD being connected to an output terminal of the first power supply circuit 102, a second power supply circuit 104 provided on the circuit board 100, an input terminal of the second power supply circuit 104 being connected to an output terminal of the rectifying circuit BD, the second power supply circuit 104 being connected to the signal ground SGND, and a component 106 provided on the circuit board 100 for connecting the power ground GND and the signal ground SGND.

Embodiments of the present application provide a power supply circuit of a gas appliance in which communication between a power ground GND and a signal ground SGND can be achieved in the power supply circuit.

In this process, the detection of whether the power ground GND and the signal ground SGND are connected can be implemented on the production line by directly performing the connection detection on the circuit where the component 106 is located. In the related embodiment, the defect that whether the communication between the power ground GND and the signal ground SGND is abnormal or not cannot be directly detected on a production line is overcome, so that the probability of poor occurrence of gas equipment caused by abnormal grounding is reduced, meanwhile, the gas equipment is ensured to meet the design requirement of electromagnetic interference, and the reliability of the gas equipment is ensured.

The embodiment of the present application is implemented based on the following principle, specifically, the circuit board 100 has a power supply ground GND and a signal ground SGND, so that a circuit provided on the circuit board 100 can be grounded by connection thereto.

The first power supply circuit 102 is located at an input side of the rectifying circuit BD, which may be understood as a power supply of the rectifying circuit BD, the second power supply circuit 104 is located at an output side of the rectifying circuit BD, which may be understood as an output of the rectifying circuit BD, and the first capacitor C1 and the second capacitor C2 are connection positions in the first power supply circuit 102 that need to be connected to the power ground GND. The components 106 are arranged so that the components 106 are used to connect the power supply ground GND and the signal ground SGND, and the current flowing from the signal ground SGND to the power supply ground GND is limited, thereby ensuring the safety of the gas equipment.

In some embodiments, the rectifying circuit BD is a rectifying bridge.

In some embodiments, the component 106 optionally includes a capacitor, or a first resistor, or a plurality of second resistors connected in series or parallel.

In this embodiment, the selection of the component 106 is defined, and in this embodiment, the power supply circuit may select the component 106 as a resistor, such as a single first resistor, according to actual use requirements, so as to limit the magnitude of the current flowing between the signal ground SGND and the power supply ground GND.

In the above embodiment, the power supply circuit may select the component 106 as a capacitor according to actual use requirements, so as to meet the actual use design requirements.

In the above embodiment, the component 106 may also be a circuit composed of a plurality of second resistors, for example, a resistor circuit formed by connecting a plurality of resistors together in series, or a resistor circuit formed by connecting a plurality of second resistors in parallel, which may be selected according to the actual design requirement of the power supply circuit of the gas device, which will not be described herein.

In the above embodiment, the resistance values or the capacitance values of the first resistor, the capacitor, and the plurality of second resistors may be taken according to actual use needs, and will not be described herein.

In some embodiments, optionally, the gas device comprises a housing 108, and the power supply circuit further comprises a first connection wire 110 connecting the power ground GND with the housing 108.

In this embodiment, the grounding of the power ground GND is achieved by providing the first connecting wire 110 so as to directly connect the power ground GND to the housing 108 of the gas appliance. In the grounding process, the grounding detection can be realized on the production line, so that the grounding reliability of the gas equipment is ensured.

In some embodiments, the first connecting wire 110 may alternatively be a wire printed on the circuit board 100, in which case the first connecting wire 110 may be connected to the housing 108 by riveting.

In some embodiments, alternatively, the first connecting wire 110 may be a wire that exists independently, in which case one end of the first connecting wire 110 is soldered to the power ground GND, and the other end of the first connecting wire 110 is connected to the housing 108 by riveting.

In some embodiments, optionally, the housing 108 is a metal housing.

In some embodiments, the first power supply circuit 102 optionally includes a first common-mode inductor LF1, a first end of the first common-mode inductor LF1 is connected to a first end of the second capacitor C2, a second end of the first common-mode inductor LF1 is connected to a first input end of the rectifying circuit BD, a third end of the first common-mode inductor LF1 is connected to a second end of the first capacitor C1, a fourth end of the first common-mode inductor LF1 is connected to a second input end of the rectifying circuit BD, and an ac connection terminal CN, a first port of the ac connection terminal CN is connected to a 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 LF 1.

In this embodiment, the first common-mode inductance LF1 is provided so as to suppress the common-mode signal in the alternating current inputted from the alternating current connection terminal CN by using the first common-mode inductance LF1, thereby ensuring the normal operation of the power supply circuit of the gas appliance and reducing the influence of electromagnetic interference.

When the number of turns and the current of the coil wound on the magnetic core on the first common-mode inductor LF1 are unchanged, the more magnetic lines of force passing through the magnetic core, the larger the magnetic flux is, the larger the corresponding inductance is, and the first common-mode inductor LF1 prevents the change of the current flowing through the coil, and in fact prevents the change of the magnetic flux, so that the common-mode inductor is used for suppressing the common-mode current.

In some embodiments, the first power supply circuit 102 optionally further includes a third capacitor C3, 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.

In this embodiment, the third capacitor C3 is provided so that the input alternating current is filtered by the third capacitor C3.

In the above embodiment, the third capacitor C3 may be a safety capacitor, in this embodiment, the third capacitor C3 does not cause electric shock when the capacitor fails, so as to improve the safety of the first power supply circuit 102, and meanwhile, improve the safety of the power supply circuit of the gas circuit.

In some embodiments, the first power supply circuit 102 optionally 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 being connected to a second end of the third capacitor C3, a second end of the second common-mode inductor LF2 being connected to the first port of the ac connection terminal CN, a third end of the second common-mode inductor LF2 being connected to the first end of the third capacitor C3, and a fourth end of the second common-mode inductor LF2 being connected to the second port of the ac connection terminal CN.

In this embodiment, by providing the second common-mode inductance LF2 so that it can constitute a two-stage processing scheme with the first common-mode inductance LF1, the processing effect of the common-mode inductance can be improved in this process.

In some embodiments, optionally, the inductance value of the second common-mode inductance LF2 is different from the inductance value of the first common-mode inductance LF 1.

In the embodiment, the two-stage processing scheme is constructed by selecting two common-mode inductors with different inductance values, so that the filtering of different filtering frequency bands can be realized, and the effect of inhibiting common-mode current is achieved.

In some embodiments, optionally, the inductance value of the second common-mode inductance LF2 is the same as the inductance value of the first common-mode inductance LF 1.

In some embodiments, the first power supply circuit 102 optionally 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, 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 which is connected to the second end of the second common-mode inductor LF2, and a second end of which is connected to the fourth end of the second common-mode inductor LF 2.

In this embodiment, the varistor VR is a voltage limiting element that is sensitive to voltage variation, and is configured to limit the voltage input to the second common-mode inductor LF2 by using the varistor VR, so as to absorb voltage surge in the alternating current, so as to reduce large fluctuation of the voltage input to the second common-mode inductor LF2, and simultaneously ensure that the amplitude of the alternating current output to the second common-mode inductor LF2 is within a design requirement range. Thereby, the first common-mode inductor LF1 can work under the normal working condition, and the stability of the output power supply of the first power supply circuit 102 is ensured.

In the above embodiment, the resistance value of the varistor VR may be taken according to actual use needs, and will not be described herein.

In the above embodiment, the fourth capacitor C4 is provided so that the fourth capacitor C4 is used to filter the input alternating current.

In the above embodiment, the fourth capacitor C4 may be a safety capacitor, in this embodiment, the fourth capacitor C4 does not cause electric shock when the capacitor fails, so as to improve the safety of the first power supply circuit 102, and meanwhile, improve the safety of the power supply circuit of the gas circuit.

In some embodiments, the first power supply circuit 102 optionally further comprises a safety device F in series with the first port of the AC connection terminal CN or in series with the second port of the AC connection terminal CN.

In this embodiment, the safety device F is provided to limit the working current in the first power supply circuit 102, so that when the working current in the first power supply circuit 102 is too large, the safety device F is used to cut off the operation of the first power supply circuit 102, thereby reducing the probability of damage of the first power supply circuit 102 due to overcurrent, and improving the reliability of the first power supply circuit 102.

The reliability of the power supply circuit of the gas appliance is also improved while the reliability of the first power supply circuit 102 is improved.

In some embodiments, optionally, the fuse device F is a fuse.

In some embodiments, the second power supply circuit 104 optionally includes a transformer T, a primary winding of which is connected to an output terminal of the rectifying circuit BD, and a first filter circuit 112, an input terminal of the first filter circuit 112 is connected to a first secondary winding of the transformer T, and an output terminal of the first filter circuit 112 is connected to the signal ground SGND.

In this embodiment, the transformer T is provided so that the power supply output from the rectifier circuit BD is converted into the power supply of another voltage by the transformer T, and is output to the load by the first filter circuit 112.

In this process, the transformer T can be arranged to output power with different voltages, so that different loads can be supplied with different power.

In the above embodiment, the first filter circuit 112 is configured to filter the power supply output by the secondary winding of the transformer T by using the first filter circuit 112, so as to reduce the high-frequency interference and/or the low-frequency interference existing in the power supply output by the secondary winding of the transformer T, and influence the normal operation of the load.

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

In some embodiments, the transformer T may be a step-up transformer or a step-down transformer, which may be selected according to actual use needs, and will not be described herein.

In some embodiments, the first filter circuit 112 optionally includes a first electrolytic capacitor EC1 connected across the first secondary winding and/or a fifth capacitor C5 connected across the first secondary winding.

In this embodiment, in the case where the first filter circuit 112 includes the first electrolytic capacitor EC1, the elimination of the high-frequency interference can be achieved by using the first electrolytic capacitor EC1, thereby reducing the influence of the high-frequency interference on the control of the gas appliance, and thus improving the reliability of the operation of the gas appliance using the power supply circuit of the gas appliance.

In the above embodiment, in the case where the first filter circuit 112 includes the fifth capacitor C5, the elimination of the low-frequency interference can be achieved by using the fifth capacitor C5, so that the influence of the low-frequency interference on the control of the gas appliance can be reduced, thereby improving the reliability of the operation of the gas appliance using the power supply circuit of the gas appliance.

In some embodiments, optionally, the first filter circuit 112 includes a first electrolytic capacitor EC1.

In some embodiments, the first filter circuit 112 optionally includes a fifth capacitance C5.

In some embodiments, optionally, the first filter circuit 112 includes both the first electrolytic capacitor EC1 and the fifth capacitor C5.

In some embodiments, the second power supply circuit 104 optionally further comprises a diode D located between the first secondary coil and the first electrolytic capacitor EC 1.

In this embodiment, the diode D is provided to rectify the power supplied from the transformer T by the diode D so as to supply the power to the first filter circuit 112.

In the above embodiment, the anode of the diode D is connected to the secondary coil, and the cathode of the diode D is connected to the first electrolytic capacitor EC 1.

In some embodiments, the second power supply circuit 104 optionally further comprises a second filter circuit 114, which is located between the primary winding of the transformer T and the output terminal of the rectifying circuit BD, the second filter circuit 114 comprising a second electrolytic capacitor EC2, a first terminal of the second electrolytic capacitor EC2 being connected to the first terminal of the primary winding, a second terminal of the second electrolytic capacitor EC2 being connected to the power ground, and/or a sixth capacitor C6, a first terminal of the sixth capacitor C6 being connected to the first terminal of the primary winding, a second terminal of the sixth capacitor C6 being connected to the power ground.

In this embodiment, the second filter circuit 114 is provided to filter the power supply output by the rectifying circuit BD by using the second filter circuit 114, so as to reduce high-frequency interference and/or low-frequency interference existing in the power supply output by the rectifying circuit BD, which affects the normal operation of the load.

In this embodiment, in the case where the second filter circuit 114 includes the second electrolytic capacitor EC2, the elimination of the high-frequency interference can be achieved by using the second electrolytic capacitor EC2, thereby reducing the influence of the high-frequency interference on the control of the gas appliance, and thus improving the reliability of the operation of the gas appliance using the power supply circuit of the gas appliance.

In the above embodiment, in the case where the second filter circuit 114 includes the sixth capacitor C6, the elimination of the low-frequency interference can be achieved by using the sixth capacitor C6, so that the influence of the low-frequency interference on the control of the gas appliance is reduced, thereby improving the reliability of the operation of the gas appliance using the power supply circuit of the gas appliance.

In some embodiments, the second filter circuit 114 optionally includes a second electrolytic capacitor EC2.

In some embodiments, the second filter circuit 114 optionally includes a sixth capacitance C6.

In some embodiments, optionally, the second filter circuit 114 includes both the second electrolytic capacitor EC2 and the sixth capacitor C6.

In some embodiments, the present invention provides a gas appliance comprising a power supply circuit for a gas appliance as defined in any one of the above.

In this embodiment, a gas appliance is proposed, wherein the gas appliance comprises a power supply circuit of the gas appliance as described above, and therefore has all the advantages of the power supply circuit of the gas appliance as described above.

Specifically, the communication between the power ground and the signal ground can be achieved in the power supply circuit.

In some embodiments, the rectifying circuit is a rectifying bridge.

In some embodiments, the gas device may alternatively be a gas stove or a gas water heater.

The features of the application "first", "second" and the like in the description and in the claims may be used for the explicit or implicit inclusion of one or more such features. In the description of the application, unless otherwise indicated, the meaning of "a plurality" is two or more. In addition, in the specification and claims, "and/or" means at least one of the connected objects, and the character "/", generally means a relationship in which the associated objects are one or.

In the claims, specification and drawings of the present invention, the term "plurality" shall mean two or more, unless otherwise explicitly defined, that the terms "upper", "lower", etc. refer to an orientation or a positional relationship based on that shown in the drawings, merely to more conveniently describe the present invention and make the description easier, and not to indicate or imply that the apparatus or element in question must have the specific orientation described, be configured and operated in the specific orientation, so that the description shall not be construed as limiting the present invention, and that the terms "connected", "mounted", "fixed", etc. shall be construed broadly, and that "connected" may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection between a plurality of objects, or a direct connection between a plurality of objects, or an indirect connection between a plurality of objects through intermediaries. The specific meaning of the terms in the present invention can be understood in detail from the above data by those skilled in the art.

In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply circuit for a gas appliance, comprising:

A circuit board having a power ground and a signal ground;

the first power supply circuit is arranged on the circuit board, the input end of the first power supply circuit is used for accessing alternating current, the first power supply circuit comprises a first capacitor and a second capacitor, and the first end of the first capacitor is connected with the second end of the second capacitor and then is connected with the power ground;

The rectification circuit is arranged on the circuit board, and the input end of the rectification circuit is connected with the output end of the first power supply circuit;

the second power supply circuit is arranged on the circuit board, the input end of the second power supply circuit is connected with the output end of the rectifying circuit, and the second power supply circuit is connected with the signal ground;

And the component is arranged on the circuit board and is connected with the power supply ground and the signal ground.

2. The power supply circuit of a gas appliance according to claim 1, wherein the component comprises:

Capacitance, or

A first resistor, or

A plurality of second resistors connected in series or parallel.

3. The power supply circuit of a gas appliance of claim 1, wherein the gas appliance comprises a housing, the power supply circuit further comprising:

And the first connecting wire is connected with the power ground and the shell.

4. A power supply circuit of a gas appliance according to any one of claims 1 to 3, wherein the first power supply circuit comprises:

The first end of the first common-mode inductor is connected with the first end of the second capacitor, the second end of the first common-mode inductor is connected with the first input end of the rectifying circuit, the third end of the first common-mode inductor is connected with the second end of the first capacitor, and the fourth end of the first common-mode inductor is connected with the second input end of the rectifying circuit;

And the first port of the alternating current connection terminal is connected with the third end of the first common-mode inductor, and the second port of the alternating current connection terminal is connected with the first end of the first common-mode inductor.

5. The power supply circuit of a gas appliance of claim 4, wherein the first power supply circuit further comprises:

And the first end of the third capacitor is connected with the first end of the second capacitor, and the second end of the third capacitor is connected with the second end of the first capacitor.

6. The power supply circuit of a gas appliance of claim 5, wherein the first power supply circuit further comprises:

The second common mode inductor is positioned between the first capacitor and the alternating current connecting terminal, the first end of the second common mode inductor is connected with the second end of the third capacitor, the second end of the second common mode inductor is connected with the first port of the alternating current connecting terminal, the third end of the second common mode inductor is connected with the first end of the third capacitor, and the fourth end of the second common mode inductor is connected with the second port of the alternating current connecting terminal.

7. The power supply circuit of a gas appliance of claim 6, wherein the first power supply circuit further comprises:

a fourth capacitor, the first end of the fourth capacitor is connected with the second end of the second common mode inductor, the second end of the fourth capacitor is connected with the fourth end of the second common mode inductor, and/or

And the first end of the piezoresistor is connected with the second end of the second common-mode inductor, and the second end of the piezoresistor is connected with the fourth end of the second common-mode inductor.

8. The power supply circuit of a gas appliance of claim 4, wherein the first power supply circuit further comprises:

and the safety device is connected with the first port of the alternating current connection terminal in series or connected with the second port of the alternating current connection terminal in series.

9. A power supply circuit of a gas appliance according to any one of claims 1 to 3, wherein the second power supply circuit comprises:

the primary coil of the transformer is connected with the output end of the rectifying circuit;

The input end of the first filter circuit is connected with the first secondary coil of the transformer, and the output end of the first filter circuit is connected with the signal ground.

10. The power supply circuit of a gas appliance of claim 9, wherein the first filter circuit comprises:

A first electrolytic capacitor connected with two ends of the first secondary coil, and/or

And the fifth capacitor is connected with two ends of the first secondary coil.

11. The power supply circuit of a gas appliance of claim 10, wherein the second power supply circuit further comprises:

and the diode is positioned between the first secondary coil and the first electrolytic capacitor.

12. The power supply circuit of a gas appliance of claim 9, wherein the second power supply circuit further comprises:

a second filter circuit located between the primary coil of the transformer and the output of the rectifier circuit, the second filter circuit comprising:

A second electrolytic capacitor having a first end connected to the first end of the primary coil and a second end connected to the power ground, and/or

And the first end of the sixth capacitor is connected with the first end of the primary coil, and the second end of the sixth capacitor is connected with the power ground wire.

13. A gas plant, characterized by comprising:

The power supply circuit of a gas appliance as claimed in any one of claims 1 to 12.