Power supply protection circuit, control method thereof and air conditioner

Abstract

The invention relates to the technical field of circuit protection, particularly provides a power supply protection circuit and a control method thereof, and an air conditioner, and aims to solve the problem of circuit damage caused by overhigh voltage due to wrong wire sequence connection. Therefore, the power supply protection circuit comprises a protection module, a control module and a power supply module, wherein a first end of the protection module is respectively connected with a first end of a power supply and a first end of the control module, a second end of the protection module is respectively connected with a second end of the power supply and a first end of the power supply module, and a second end of the control module is connected with a second end of the power supply module. And a load is connected between the third end and the fourth end of the power supply module so as to supply power to the load. According to the invention, the power supply of the rear-end load can be effectively controlled under the condition that the voltage is too high due to wrong circuit line sequence connection, so that the damage of a load device caused by overvoltage is avoided, and the safety of the rear-end load is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of circuit protection, and particularly relates to a power supply protection circuit, a control method thereof, and an air conditioner. Background Art

[0002] In a three-phase four-wire circuit system, there are different types of loads. Some devices operate in a three-phase power environment, while others operate in a single-phase power environment. When obtaining power from a single-phase power supply, a rectifier bridge is usually used to convert alternating current (AC) into direct current (DC), and a smoothing capacitor is used for filtering to stabilize the voltage output and reduce voltage fluctuations. At the back end of the direct current, a switching power supply circuit and other circuits are connected. The main function of the switching power supply circuit is to convert the relatively high DC voltage after rectification and smoothing into the relatively low DC voltages required by other electronic components, such as 15V, 12V, etc. However, in a single-phase system, if two live wires are wrongly connected to a device that should receive single-phase input, then the rectifier bridge and electrolytic capacitor may be damaged due to excessive voltage. If the rectifier bridge and electrolytic capacitor devices are replaced with models with higher voltage withstand, the cost will increase.

[0003] Correspondingly, there is a need in the art for a new circuit protection solution to solve the above problems. Summary of the Invention

[0004] In order to overcome the above defects, the present application is proposed to solve or at least partially solve the technical problem of circuit damage caused by excessive voltage due to incorrect wiring sequence.

[0005] In a first aspect, a power supply protection circuit is provided. The power supply protection circuit includes a protection module, a control module, and a power supply module. Wherein, a first end of the protection module is respectively connected to a first end of a power supply and a first end of the control module, a second end of the protection module is respectively connected to a second end of the power supply and a first end of the power supply module, a second end of the control module is connected to a second end of the power supply module, and a load is connected between a third end and a fourth end of the power supply module to supply power to the load.

[0006] In a technical solution of the above power supply protection circuit, the protection module includes a first rectifier bridge and a switching power supply circuit. A first end and a second end of the first rectifier bridge are respectively connected to a first end and a second end of the power supply, and a third end and a fourth end of the first rectifier bridge are respectively connected to a first end and a second end of the switching power supply circuit.

[0007] In a technical solution of the above power protection circuit, the protection module further includes a first capacitor. One end of the first capacitor is respectively connected to the third end of the first rectifier bridge and the first end of the switching power supply circuit, and the other end of the first capacitor is respectively connected to the fourth end of the first rectifier bridge and the second end of the switching power supply circuit.

[0008] In a technical solution of the above power protection circuit, the control module includes a relay. The power supply end of the relay is electrically connected to the third end of the switching power supply circuit, the common end of the relay is grounded, the control end of the relay is connected to the first end of the power supply, and the contact end of the relay is connected to the second end of the power supply module.

[0009] In a technical solution of the above power protection circuit, the power supply module includes a second rectifier bridge. The first end of the second rectifier bridge is connected to the second end of the power supply, the second end of the second rectifier bridge is connected to the second end of the control module, the third end of the second rectifier bridge is connected to the first end of the load, and the fourth end of the second rectifier bridge is connected to the second end of the load.

[0010] In a technical solution of the above power protection circuit, the power supply module further includes a second capacitor. One end of the second capacitor is respectively connected to the third end of the second rectifier bridge and the first end of the load, and the other end of the second capacitor is respectively connected to the fourth end of the second rectifier bridge and the second end of the load.

[0011] In a technical solution of the above power protection circuit, the fourth end of the switching power supply circuit is electrically connected to the load to provide a low-voltage power supply to the load.

[0012] In a second aspect, a control method for a power protection circuit is provided. The power protection circuit includes a protection module, a control module, and a power supply module. Among them, the first end of the protection module is respectively connected to the first end of the power supply and the first end of the control module, the second end of the protection module is respectively connected to the second end of the power supply and the first end of the power supply module, the second end of the control module is connected to the second end of the power supply module, and a load is connected between the third end and the fourth end of the power supply module to supply power to the load. The method includes: obtaining an input voltage by the protection module, and judging whether the wiring of the power protection circuit is abnormal based on the input voltage; if so, controlling the control module to disconnect by the protection module; otherwise, controlling the control module to close by the protection module, and then the power supply module works normally.

[0013] In one technical solution of the control method of the above power protection circuit, determining whether the power protection circuit is abnormally wired based on the input voltage includes: the protection module determines whether the input voltage is greater than a preset voltage threshold. If so, it is determined that the power protection circuit is abnormally wired; otherwise, it is determined that the power protection circuit is normally wired.

[0014] In a third aspect, an air conditioner is provided, and the air conditioner includes the power protection circuit according to any one of the technical solutions of the above power protection circuit.

[0015] One or more of the above technical solutions of the present application have at least one or more of the following beneficial effects:

[0016] The power protection circuit provided by the present application includes a protection module, a control module, and a power supply module. Among them, the first end of the protection module is respectively connected to the first end of the power supply and the first end of the control module, the second end of the protection module is respectively connected to the second end of the power supply and the first end of the power supply module, the second end of the control module is connected to the second end of the power supply module, and a load is connected between the third end and the fourth end of the power supply module to supply power to the load. Through the cooperation of the protection module and the control module, the present application can judge whether the overvoltage situation of the circuit is abnormal, and control the power supply module to connect to the power supply according to the judgment result and supply power to the load, which can effectively avoid the problem of device damage to the load circuit caused by overvoltage. Description of the Drawings

[0017] Referring to the drawings, the disclosure of the present application will become easier to understand. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present application. Among them:

[0018] Figure 1 is a schematic diagram of the main structure of the circuit according to the background technology of the present application;

[0019] Figure 2 is a schematic diagram of the main structure of the power protection circuit according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of the main step flow of the control method of the power protection circuit according to an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of the main structure of the air conditioner according to an embodiment of the present application. Detailed Embodiments

[0022] Some embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0023] In the description of the present application, a "module" and a "processor" may include hardware, software, or a combination of both. A module may include a hardware circuit, various suitable sensors, communication ports, memories, and may also include a software part, such as program code, or may be a combination of software and hardware. A processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, in hardware, or in a combination of both. A computer-readable storage medium includes any suitable medium that can store program code, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and so on. The term "A and / or B" represents all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one of A or B" or "at least one of A and B" has a meaning similar to "A and / or B" and may include only A, only B, or A and B. The singular terms "a" and "the" may also include the plural form.

[0024] In a three-phase four-wire circuit system, some devices operate in a three-phase power environment, while others operate in a single-phase power environment. When obtaining power from a single-phase power source, a rectifier bridge is usually used to convert alternating current (AC) into direct current (DC), and a smoothing capacitor is used for filtering to stabilize the voltage output and reduce voltage fluctuations. At the back end of the direct current, a switching power supply circuit and other single-phase power subsequent circuits are connected. The main function of the switching power supply circuit is to convert the relatively high DC voltage after rectification and smoothing into the relatively low DC voltages required by other electronic components, such as 15V, 12V, etc.

[0025] When powering a single-phase electrical load, it is very easy to misconnect two power live wires, as Figure 1 shown, misconnecting the power live wire T and the power neutral wire N into the power live wire T and the power live wire R, which will cause the subsequent rectifier bridge and electrolytic capacitor to be damaged due to overvoltage. If the rectifier bridge and electrolytic capacitor are replaced with models with higher voltage withstand, the cost will increase.

[0026] Refer to the attached Figure 2 , Figure 2 is a schematic diagram of the main structure of a power protection circuit according to an embodiment of the present application. As Figure 2As shown in the figure, the power protection circuit of the present application includes a protection module, a control module, and a power supply module. Among them, the first end of the protection module is respectively connected to the first end of the power supply and the first end of the control module. The second end of the protection module is respectively connected to the second end of the power supply and the first end of the power supply module. The second end of the control module is connected to the second end of the power supply module. A load is connected between the third end and the fourth end of the power supply module to supply power to the load.

[0027] Specifically, the protection module is used to obtain the input voltage provided by the single-phase AC power supply and determine whether the input voltage is abnormal. The control module selects whether to transfer the input voltage to the power supply module to supply power to the load according to the judgment result of the protection module.

[0028] Through the cooperation of the protection module and the control module, the present application judges whether the overvoltage situation of the circuit is abnormal, and can effectively control the power supply of the backend load in the case of too high voltage, thereby avoiding damage to the load devices caused by overvoltage and ensuring the safety of the circuit and the load devices.

[0029] In one embodiment, the protection module includes a first rectifier bridge and a switching power supply circuit. The first end and the second end of the first rectifier bridge are respectively connected to the first end and the second end of the power supply. The third end and the fourth end of the first rectifier bridge are respectively connected to the first end and the second end of the switching power supply circuit.

[0030] Specifically, the protection module includes a first rectifier bridge and a switching power supply circuit. Among them, the first rectifier bridge receives the input voltage of the single-phase AC power supply through its first end and second end, and performs rectification processing on it. The rectified voltage is transmitted to the switching power supply circuit.

[0031] The switching power supply circuit contains a switching power supply chip with overvoltage protection function. This circuit will judge the received rectified voltage to determine whether there is a situation of too high voltage. If it is detected that the voltage exceeds the safe range, the switching power supply chip will output a corresponding control signal to ensure the safety of the circuit.

[0032] In one embodiment, the protection module further includes a first capacitor. One end of the first capacitor is respectively connected to the third end of the first rectifier bridge and the first end of the switching power supply circuit. The other end of the first capacitor is respectively connected to the fourth end of the first rectifier bridge and the second end of the switching power supply circuit.

[0033] Specifically, the first capacitor is a filter capacitor. The first capacitor is used to smooth the rectified voltage output by the first rectifier bridge. After the first capacitor filters the rectified voltage, it provides a more stable and smooth DC voltage to the subsequent switching power supply circuit. Since the power of the switching power supply circuit is relatively low, a filter capacitor with a smaller capacitance can be selected for the first capacitor.

[0034] In one embodiment, the control module includes a relay. The power supply terminal of the relay is electrically connected to the third terminal of the switching power supply circuit. The common terminal of the relay is grounded. The control terminal of the relay is connected to the first terminal of the power supply. The contact terminal of the relay is connected to the second terminal of the power supply module.

[0035] Specifically, the control module includes a relay, which is used to receive a control signal from the switching power supply circuit. The control signal is generated based on the judgment result of whether the input voltage is too high.

[0036] When the switching power supply circuit detects that the voltage is normal, it outputs a 12V power signal as a control signal to the relay. If it detects that the voltage is too high, the switching power supply circuit will not output a 12V signal, or outputs a different signal (for example, 0V) to indicate an abnormal situation.

[0037] The relay determines the closed or open state of its contacts according to the received control signal, thereby controlling the power supply to the rear-end load. When the voltage is normal, the contacts of the relay are closed, allowing the input voltage of the single-phase AC power supply to be smoothly transmitted to the power supply module to ensure the normal operation of the load.

[0038] When the switching power supply circuit detects an overvoltage situation, the contacts of the relay will open, cutting off the input voltage of the single-phase AC power supply to prevent the excessive voltage from being transmitted to the subsequent circuit and the load, effectively protecting the safety of the subsequent circuit and the load.

[0039] In one embodiment, the power supply module includes a second rectifier bridge. The first terminal of the second rectifier bridge is connected to the second terminal of the power supply. The second terminal of the second rectifier bridge is connected to the second terminal of the control module. The third terminal of the second rectifier bridge is connected to the first terminal of the load. The fourth terminal of the second rectifier bridge is connected to the second terminal of the load.

[0040] Specifically, the second rectifier bridge is used to obtain the input voltage of the single-phase AC power supply transmitted by the relay under normal voltage conditions, and perform rectification processing on the input voltage, and transmit the rectified voltage to the load to supply power to the load.

[0041] In one embodiment, the power supply module further includes a second capacitor. One end of the second capacitor is respectively connected to the third terminal of the second rectifier bridge and the first terminal of the load. The other end of the second capacitor is respectively connected to the fourth terminal of the second rectifier bridge and the second terminal of the load.

[0042] Specifically, the second capacitor is a filtering capacitor. The second capacitor is used to smooth the rectified voltage output by the second rectifier bridge. After filtering the rectified voltage by the second capacitor, a more stable and smooth DC voltage is provided to the subsequent load. The capacitance of the second capacitor is greater than that of the first capacitor.

[0043] In one embodiment, the fourth terminal of the switching power supply circuit is electrically connected to the load to provide a low-voltage power supply to the load.

[0044] Specifically, the switching power supply circuit is also used to convert the input voltage into a low-voltage power supply suitable for use by weak-current loads, such as 15V, 12V, etc., to meet the requirements of different weak-current loads.

[0045] Refer to the appendix Figure 3 , Figure 3 FIG. is a schematic diagram of the main steps of the control method of the power supply protection circuit according to an embodiment of the present application; an embodiment of the present application provides a control method for a power supply protection circuit. The power supply protection circuit includes a protection module, a control module, and a power supply module. Among them, the first terminal of the protection module is respectively connected to the first terminal of the power supply and the first terminal of the control module. The second terminal of the protection module is respectively connected to the second terminal of the power supply and the first terminal of the power supply module. The second terminal of the control module is connected to the second terminal of the power supply module. A load is connected between the third terminal and the fourth terminal of the power supply module to supply power to the load.

[0046] As Figure 3 shown, the control method of the power supply protection circuit in the embodiment of the present application mainly includes the following steps S101 to S103.

[0047] Step S101: The protection module obtains the input voltage and determines whether the power supply protection circuit is abnormally wired based on the input voltage.

[0048] Step S102: If so, the protection module controls the control module to disconnect.

[0049] Step S103: Otherwise, the protection module controls the control module to close, and then the power supply module works normally.

[0050] Regarding step S101, in one embodiment, determining whether the power supply protection circuit is abnormally wired based on the input voltage includes: the protection module determines whether the input voltage is greater than a preset voltage threshold. If so, it is determined that the power supply protection circuit is abnormally wired; otherwise, it is determined that the power supply protection circuit is normally wired.

[0051] Specifically, the first rectifier bridge obtains the input voltage, rectifies the input voltage, and after filtering the rectified input voltage through the first capacitor, sends it to the switching power supply circuit.

[0052] If the power supply connected to the first rectifier bridge is misconnected to two live wires, the voltage after rectification by the first rectifier bridge and filtering by the first capacitor will be very large. The switching power supply chip compares the filtered input voltage with a preset voltage threshold. If the input voltage is greater than the preset voltage threshold, it is determined that the wiring of the power supply protection circuit is abnormal. If the input voltage is less than or equal to the preset voltage threshold, it is determined that the wiring of the power supply protection circuit is normal.

[0053] Regarding step S102, if so, the protection module controls the control module to disconnect.

[0054] Specifically, in the case of abnormal wiring of the power supply protection circuit, the switching power supply circuit outputs a disconnection control signal to the relay. The disconnection control signal can be a 0V power signal. When the relay receives the disconnection control signal, it will not be energized, that is, it remains in the disconnected state. The relay will not transfer the input voltage of the single-phase AC power supply to the power supply module. The second rectifier bridge and the second filter capacitor of the power supply module are protected, and the power supply module effectively cuts off the power supply to the rear-end load.

[0055] In this way, it is ensured that when wiring abnormalities or overvoltage are detected, a rapid response can be made and protective measures can be taken to prevent overvoltage from damaging the rear-end load and the circuit, and to ensure the safety and reliability of the system.

[0056] Regarding step S103, otherwise, the protection module controls the control module to close, and then the power supply module operates normally.

[0057] Specifically, in the case of normal wiring of the power supply protection circuit, the switching power supply chip outputs a closing control signal to the relay. The closing control signal can be a 12V power signal. When the relay receives the closing control signal, the relay is energized and an electrical connection is established, allowing the input voltage of the single-phase AC power supply to be transferred to the second rectifier bridge through the relay.

[0058] After the second rectifier bridge receives the input voltage of the single-phase AC power supply from the relay, it rectifies it and converts the AC voltage into a DC voltage. Subsequently, the rectified voltage is further filtered by the second capacitor to ensure that the output is a more stable and smoother DC voltage. Finally, the filtered DC voltage is provided to the load to ensure that the load can receive a stable and high-quality power supply.

[0059] This design ensures that under the condition of normal wiring of the power supply protection circuit, the single-phase AC power supply can be effectively converted into a DC power supply suitable for the load, and the power supply quality is improved through filtering, thus ensuring the safe and stable operation of the load.

[0060] It should be noted that although the above embodiments describe the various steps in a specific order, those skilled in the art can understand that for the purpose of achieving the effects of the present application, it is not necessary to execute the different steps in such an order. They can be executed simultaneously (in parallel) or in other orders, and the adjusted solutions are equivalent technical solutions to the technical solutions described in the present application, and thus will also fall within the protection scope of the present application.

[0061] Those skilled in the art can understand that all or part of the processes in the method of implementing the above embodiments of the present application can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable storage medium can include: any entity or device, medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal, and software distribution medium, etc., that can carry the computer program code.

[0062] On the other hand, the present application also provides an air conditioner.

[0063] Refer to the attached Figure 4 , Figure 4 is a schematic diagram of the main structure of an air conditioner according to an embodiment of the present application. In an embodiment of an air conditioner according to the present application, the air conditioner includes the power protection circuit described in any of the above embodiments.

[0064] For the sake of convenience of description, only the parts related to the embodiments of the present application are shown. For the specific technical details not disclosed, please refer to the method part of the embodiments of the present application. The air conditioner can be an air conditioner device formed by various electronic devices.

[0065] Furthermore, it should be understood that since the setting of each module is only for explaining the functional units of the device of the present application, the physical devices corresponding to these modules can be the processor itself, or a part of the software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only illustrative.

[0066] Those skilled in the art can understand that the various modules in the device can be adaptively split or combined. Such splitting or combination of specific modules will not cause the technical solution to deviate from the principle of the present application. Therefore, the technical solutions after splitting or combination will all fall within the protection scope of the present application.

[0067] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A power protection circuit, characterized in that, The power protection circuit includes a protection module, a control module, and a power supply module; wherein, The first end of the protection module is respectively connected to the first end of the power supply and the first end of the control module. The second end of the protection module is respectively connected to the second end of the power supply and the first end of the power supply module. The second end of the control module is connected to the second end of the power supply module. A load is connected between the third end and the fourth end of the power supply module to supply power to the load.

2. The power protection circuit according to claim 1, characterized in that The protection module includes a first rectifier bridge and a switching power supply circuit; The first end and the second end of the first rectifier bridge are respectively connected to the first end and the second end of the power supply. The third end and the fourth end of the first rectifier bridge are respectively connected to the first end and the second end of the switching power supply circuit.

3. The power protection circuit according to claim 2, wherein The protection module further includes a first capacitor. One end of the first capacitor is respectively connected to the third end of the first rectifier bridge and the first end of the switching power supply circuit. The other end of the first capacitor is respectively connected to the fourth end of the first rectifier bridge and the second end of the switching power supply circuit.

4. The power protection circuit according to claim 2, wherein The control module includes a relay. The power supply end of the relay is electrically connected to the third end of the switching power supply circuit. The common end of the relay is grounded. The control end of the relay is connected to the first end of the power supply. The contact end of the relay is connected to the second end of the power supply module.

5. The power protection circuit according to claim 1, wherein The power supply module includes a second rectifier bridge; the first end of the second rectifier bridge is connected to the second end of the power supply. The second end of the second rectifier bridge is connected to the second end of the control module. The third end of the second rectifier bridge is connected to the first end of the load. The fourth end of the second rectifier bridge is connected to the second end of the load.

6. The power protection circuit according to claim 5, wherein, The power supply module further includes a second capacitor. One end of the second capacitor is respectively connected to the third end of the second rectifier bridge and the first end of the load. The other end of the second capacitor is respectively connected to the fourth end of the second rectifier bridge and the second end of the load.

7. The power protection circuit according to claim 2, characterized in that, The fourth end of the switching power supply circuit is electrically connected to the load to provide a low-voltage power supply to the load.

8. A control method for a power protection circuit, characterized in that, The power protection circuit includes a protection module, a control module, and a power supply module. Among them, the first end of the protection module is respectively connected to the first end of the power supply and the first end of the control module. The second end of the protection module is respectively connected to the second end of the power supply and the first end of the power supply module. The second end of the control module is connected to the second end of the power supply module. A load is connected between the third end and the fourth end of the power supply module to supply power to the load; The method includes: Obtaining an input voltage by the protection module, and determining whether the wiring of the power protection circuit is abnormal based on the input voltage; If so, controlling the control module to disconnect by the protection module; Otherwise, controlling the control module to close by the protection module, and then the power supply module works normally.

9. The control method of the power protection circuit according to claim 8, characterized in that, The determining whether the wiring of the power protection circuit is abnormal based on the input voltage includes: Judging by the protection module whether the input voltage is greater than a preset voltage threshold. If so, determining that the wiring of the power protection circuit is abnormal; otherwise, determining that the wiring of the power protection circuit is normal.

10. An air conditioner, characterized in that, The air conditioner includes the power protection circuit according to any one of claims 1 to 7.

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