Air conditioner protection device and air conditioner system

Abstract

The utility model provides an air conditioner protection device and an air conditioner system. The protection device comprises a power device and a control module. A first end of a power switch tube in the power device is connected with an external power supply, and a second end of the power switch tube is connected with an external load; the control end of the control module is connected with the third end of the power switch tube, and the acquisition end of the control module is connected with the second end of the power switch tube, so that the control module can acquire the voltage signal and the current signal output by the power switch tube through the acquisition end, and the operation state of the power device is monitored; and under the condition that the operation state of the power device is abnormal, the reason and the abnormal position of the power device are confirmed, so that maintenance personnel can maintain the power device conveniently. Meanwhile, the control module provides a turn-off signal for the third end of the power switch tube through the control end, and the power switch tube is quickly switched to a turn-off state, so that an external load connected with the power device is protected.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly relates to an air conditioner protection device and an air conditioner system. Background Art

[0002] In a variable-frequency air conditioner, in order to reduce current harmonics and improve the power factor, a PFC (Power Factor Correction) control circuit is generally adopted on the electronic control board of the variable-frequency air conditioner.

[0003] In the related art, there is a lack of management and control of the input electrical signal. When the input electrical signal is unstable, for example, there is a power supply voltage drop or undervoltage, or the power supply voltage is interrupted frequently within a short period of time, the PFC control circuit cannot timely adjust the voltage output to the load, which may impact related energy storage circuits and loads in the power system of the air conditioner, reducing the reliability of the power system of the air conditioner, and even possibly causing damage to related circuit components in the air conditioner. Summary of the Utility Model

[0004] The present application aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, the first object of the present application is to propose an air conditioner protection device and an air conditioner system, which can manage and control the electrical signal between the input and output in the air conditioner system, improve the safety of the components in the air conditioner, and perform fault location and fault cause diagnosis when a power device fails, improve the maintenance efficiency of the air conditioner protection device, and reduce the maintenance cost.

[0006] To achieve the above object, an embodiment of the first aspect of the present application proposes an air conditioner protection device, including a power device and a control and protection module; wherein,

[0007] The power device includes a power switch tube, a first end of the power switch tube is connected to an external power supply, and a second end of the power switch tube is connected to an external load;

[0008] The control and protection module includes a collection end and a control end, the control end is connected to a third end of the power switch tube to drive the power switch tube to switch between a conducting state and a cutoff state; the collection end is connected to the second end of the power switch tube to obtain the voltage signal and current signal output by the power switch tube in real time.

[0009] Optionally, the control and protection module further includes a microcontroller, which is connected to the acquisition end to monitor the operating state of the power device; the microcontroller is connected to the control end to drive the power switch tube to switch from the on state to the off state in the case of abnormal operation of the power device.

[0010] Optionally, the abnormal states that the power device appears include one of short - circuit fault, open - circuit fault, and parameter drift fault.

[0011] Optionally, when the microcontroller can normally obtain the output current of the power switch tube at the acquisition end but cannot obtain the output voltage of the power switch tube, it determines that the power device has a short - circuit fault, and drives the power switch tube to switch from the on state to the off state through the control end.

[0012] Optionally, when the microcontroller can normally obtain the output voltage of the power switch tube at the acquisition end but cannot obtain the output current of the power switch tube, it determines that the power device has an open - circuit fault, and drives the power switch tube to switch from the on state to the off state through the control end.

[0013] Optionally, the microcontroller obtains the actual value of the on - resistance of the power switch tube according to the output voltage and output current of the power switch tube acquired at the acquisition end, and determines that the power device has a parameter drift fault and drives the power switch tube to switch from the on state to the off state through the control end when the increment between the actual value and the theoretical value of the on - resistance of the power switch tube is greater than the set threshold.

[0014] Optionally, the set threshold is that the increment of the on - resistance of the power switch tube does not exceed 20% of the theoretical value of the on - resistance.

[0015] Optionally, the protection device further includes a power supply module, which is connected to the control and protection module to supply power to the control and protection module.

[0016] Optionally, the power switch tube includes a MOS tube or an IGBT tube.

[0017] To achieve the above object, an embodiment of the second aspect of the present application proposes an air - conditioning system, which includes the air - conditioning protection device described in any one of the above.

[0018] The air - conditioning protection device and the air - conditioning system provided by the present application at least have the following beneficial effects:

[0019] The present application provides an air conditioner protection device and an air conditioner system. The protection device includes a power device and a control and protection module. By connecting the first end of the power switch tube in the power device to an external power supply, the second end of the power switch tube to an external load, connecting the control end of the control and protection module to the third end of the power switch tube, and connecting the acquisition end of the control and protection module to the second end of the power switch tube, the control and protection module can obtain the voltage signal and current signal output by the power switch tube through the acquisition end, thereby monitoring the operating state of the power device. And when there is an abnormality in the operating state of the power device, a drive signal is provided to the third end of the power switch tube through the control end to quickly switch the power switch tube to the off state, thereby protecting the external load connected to the second end of the power switch tube.

[0020] Furthermore, the control and protection module can also obtain the output voltage and current of the power switch tube through the acquisition end, quickly diagnose the specific abnormal state of the power device, confirm the cause of the abnormality and the location of the abnormal power device, so that maintenance personnel can repair the protection device accordingly without replacing the entire protection device, greatly reducing the maintenance cost of the protection device.

[0021] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Brief Description of the Drawings

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0023] Figure 1 FIG. is a schematic structural diagram of an air conditioner protection device shown according to an embodiment of the present application.

[0024] Figure 2 FIG. is an equivalent structural diagram of a power device during a short-circuit fault shown according to an embodiment of the present application.

[0025] Figure 3 FIG. is an equivalent structural diagram of a power device during an open-circuit fault shown according to an embodiment of the present application.

[0026] Figure 4 FIG. is an equivalent structural diagram of a power device during a parameter drift fault shown according to an embodiment of the present application. Detailed Embodiments

[0027] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0028] In an existing air conditioner system, the core power device needs to bear the main voltage, current, and thermal stress during use, resulting in a higher failure rate of the power device compared to other components. However, the protection devices of existing air conditioners can often only detect fault phenomena such as over- and under-voltage, over-current, and over-temperature, and lack detection means for analyzing the fault mechanism and failure mode and fault diagnosis of internal power devices.

[0029] Based on the above problems, in the first aspect of the embodiments of the present application, an air conditioner protection device is provided, as Figure 1 shown. The protection device includes a power device and a control and protection module. Among them, the power device includes a power switch tube, and the first end of the power switch tube is connected to an external power supply, and the second end of the power switch tube is connected to an external load. The control and protection module includes a collection end and a control end. The control end is connected to the third end of the power switch tube to drive the power switch tube to switch between the on state and the off state; the collection end is connected to the second end of the power switch tube to obtain the voltage signal and current signal output by the power switch tube.

[0030] It can be understood that by connecting the first end of the power switch tube to an external power supply and the second end of the power switch tube to an external load, when the power switch tube is in the on state, that is, when the first end and the second end of the power switch tube are conducting, the external power supply can supply power to the external load through the power switch tube, enabling the air conditioner to operate normally.

[0031] Since the control end of the control and protection module is connected to the third end of the power switch tube, the control and protection module can provide a drive signal to the third end of the power switch tube through the control end, so that the power switch tube can switch between the on state and the off state under the drive of the control and protection module.

[0032] Since the collection end of the control and protection module is connected to the second end of the power switch tube, the control and protection module can obtain the voltage and current output by the power switch tube through the collection end, and monitor the operating state of the power device according to the output voltage and current results. Furthermore, when the operating state of the power device is abnormal, a drive signal can be provided to the third end of the power switch tube through the control end to quickly switch the power switch tube to the off state, thereby protecting the external load connected to the second end of the power switch tube.

[0033] Meanwhile, the control and protection module can also obtain the voltage signal and current signal output by the power switch tube through the acquisition end, quickly diagnose the specific abnormal state of the power device, confirm the cause of the abnormality and the location of the abnormal power device, so that maintenance personnel can repair the protection device accordingly, instead of replacing the entire protection device, greatly reducing the maintenance cost of the protection device.

[0034] It should be noted that the external load connected to the third end of the power switch tube is only used as an example. In actual applications, the component connected to the third end of the power switch tube can also be an energy storage element in the energy storage circuit.

[0035] In some embodiments, the control and protection module may include a microcontroller inside. Among them, the microcontroller is connected to the acquisition end to monitor the operating state of the power device; the microcontroller is connected to the control end to drive the power switch tube to switch from the on state to the off state when the power device operates abnormally.

[0036] It can be understood that by connecting the microcontroller to the acquisition end, the microcontroller can obtain the voltage and current output by the power switch tube, and monitor whether there is an abnormality in the operating state of the power device according to the output voltage and current results. And by connecting the microcontroller to the control end, the microcontroller can control the power switch tube to switch between the on state and the off state based on the operating state of the power device.

[0037] Thus, when the microcontroller determines that the operating state of the power device is abnormal, it can output a turn-off signal to the third end of the power switch tube through the control end, causing the power switch tube to quickly switch to the off state, so that the external power supply can no longer supply power to the external load through the power switch tube, thereby protecting the external load.

[0038] Meanwhile, the microcontroller can also obtain the voltage signal and current signal output by the second end of the power switch tube through the acquisition end, quickly diagnose the specific abnormal state of the power device, confirm the cause of the abnormality and the location of the abnormal power device, so that maintenance personnel can repair the protection device accordingly, instead of replacing the entire protection device, greatly reducing the maintenance cost of the protection device.

[0039] As an example, the microcontroller can detect the rated voltage of the external power supply input to the power device within a limited time range and whether its fluctuation range exceeds the defined voltage threshold based on the voltage signal obtained from the acquisition end, so as to judge whether the power device has overvoltage or undervoltage faults.

[0040] Therefore, when the input voltage of the external power supply exceeds the voltage threshold, the power switch transistor will not be immediately turned off. At this time, if the input voltage drops back to the normal fluctuation range within the specified time, it can be considered the influence of a surge voltage, and the protection module is controlled not to send a protection signal, and the power device remains in normal operation; otherwise, if the input voltage still exceeds the specified voltage threshold within the specified time, the protection module can determine that an overvoltage or undervoltage fault has occurred in the power device and quickly switch the power switch transistor to the off state.

[0041] As an example, the microcontroller can judge whether a short-circuit fault, an open-circuit fault or a parameter drift fault has occurred in the power device based on the voltage signal and current signal acquired by the acquisition terminal.

[0042] When the microprocessor can normally acquire the current signal output by the power switch transistor through the acquisition terminal but cannot acquire the voltage signal output by the power switch transistor, the equivalent structure of the power device is as Figure 2 shown, which is equivalent to connecting a small-value resistor R in parallel between the first end and the second end of the power switch transistor f1 . (For example, 10 mΩ) Thus, the microprocessor can judge that a short-circuit fault has occurred in the power device. At the same time, a turn-off signal is sent to the third end of the power switch transistor through the control terminal, so that the power switch transistor quickly switches to the off state.

[0043] When the microprocessor can normally acquire the voltage signal output by the power switch transistor through the acquisition terminal but cannot acquire the current signal output by the power switch transistor, at this time, the equivalent structure of the power device is as Figure 3 shown, which is equivalent to connecting a large-value resistor R in series at the first end of the power switch transistor f2 (For example, 10 MΩ), and connecting a small-value capacitor C in parallel at both ends of the large-value resistor R f2 . (For example, 10 nF) Thus, the microprocessor can judge that an open-circuit fault has occurred in the power device. At the same time, a turn-off signal is sent to the third end of the power switch transistor through the control terminal, so that the power switch transistor quickly switches to the off state. 1 (For example, 10 nF). Thus, the microprocessor can judge that an open-circuit fault has occurred in the power device. At the same time, a turn-off signal is sent to the third end of the power switch transistor through the control terminal, so that the power switch transistor quickly switches to the off state.

[0044] When the microprocessor normally acquires the voltage signal and current signal output by the power switch transistor through the acquisition terminal, the microprocessor can obtain the actual value of the on-resistance of the power switch transistor. At this time, the equivalent structure of the power device is as Figure 4 shown, which is equivalent to directly replacing the power switch transistor with an on-resistance R ds . Thus, the microcontroller can judge whether a parameter drift fault has occurred in the power device through the increment of the actual value and the theoretical value of the on-resistance of the power switch transistor. When the increment of the on-resistance of the power switch transistor exceeds the set threshold, it is judged that a parameter drift fault has occurred in the power device. At the same time, the power switch transistor is driven to switch from the on state to the off state through the control terminal.

[0045] In this embodiment, the set threshold may be that the increment of the on-resistance of the power switch tube does not exceed 20% of the theoretical value of the on-resistance. That is to say, when the increment of the on-resistance of the power switch tube exceeds 20% of the theoretical value of the on-resistance, the microprocessor determines that a parameter drift fault occurs in the power device.

[0046] It should be noted that the above-mentioned power switch tube includes, but is not limited to, any one of MOS tubes (Metal-Oxide-Semiconductor Field-Effect Transistor) and IGBT tubes (Insulate-Gate Bipolar Transistor).

[0047] In some embodiments, the protection device provided in this application further includes a power supply module and an isolation circuit. Among them, the power supply module is connected to the control protection module to supply power for the operation of the control protection module. The isolation circuit is connected to the control protection module to electrically isolate the control signal input to the control protection module and the status signal output by the control protection module.

[0048] The second aspect of the embodiments of this application also provides an air-conditioning system, which adopts the air-conditioning protection device described in any of the above embodiments to improve the operation stability of the air conditioner.

[0049] In summary, this application provides an air-conditioning protection device and an air-conditioning system. The protection device includes a power device and a control protection module. By connecting the first end of the power switch tube in the power device to an external power supply, the second end of the power switch tube to an external load, the control end of the control protection module to the third end of the power switch tube, and the acquisition end of the control protection module to the second end of the power switch tube, the control protection module can obtain the voltage signal and current signal output by the power switch tube through the acquisition end, thereby monitoring the operation state of the power device. And when the operation state of the power device is abnormal, a drive signal is provided to the third end of the power switch tube through the control end to quickly switch the power switch tube to the off state, thereby protecting the external load connected to the second end of the power switch tube.

[0050] Furthermore, the control protection module can also obtain the output voltage and current of the power switch tube through the acquisition end, quickly diagnose the specific abnormal state of the power device, confirm the cause of the abnormality and the location of the abnormal power device, so that maintenance personnel can repair the protection device accordingly without replacing the entire protection device, greatly reducing the maintenance cost of the protection device.

[0051] In the description of the foregoing embodiments, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the 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 one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

Claims

1. An air conditioning protection device, characterized in that: It includes power devices and control protection modules, among which: The power device comprises a power switch tube, a first end of the power switch tube is connected to an external power source, and a second end of the power switch tube is connected to an external load; The control protection module includes a collection end and a control end, the control end is connected to the third end of the power switch tube to drive the power switch tube to switch between an on state and an off state; the collection end is connected to the second end of the power switch tube to obtain a voltage signal and a current signal output by the power switch tube in real time.

2. The protection device according to claim 1, characterized in that: The control and protection module also includes a microcontroller, which is connected to the acquisition end to monitor the operating status of the power device; the microcontroller is connected to the control end to drive the power switch tube to switch from the on state to the off state when the power device operates abnormally.

3. The protection device according to claim 2, characterized in that: The abnormal state of the power device includes one of a short circuit fault, an open circuit fault and a parameter drift fault.

4. The protection device according to claim 3, characterized in that: When the acquisition end can normally obtain the output current of the power switch tube but cannot obtain the output voltage of the power switch tube, the microcontroller determines that a short circuit fault occurs in the power device, and drives the power switch tube to switch from the on state to the off state through the control end.

5. The protection device according to claim 3, characterized in that: When the acquisition end can normally obtain the output voltage of the power switch tube but cannot obtain the output current of the power switch tube, the microcontroller determines that an open circuit fault occurs in the power device, and drives the power switch tube to switch from the on state to the off state through the control end.

6. The protection device according to claim 3, characterized in that: The microcontroller obtains the actual value of the on-resistance of the power switch tube according to the output voltage and output current of the power switch tube obtained by the acquisition end, and judges that the power device has a parameter drift fault when the increment between the actual value and the theoretical value of the on-resistance of the power switch tube is greater than a set threshold, and drives the power switch tube to switch from the on state to the off state through the control end.

7. The protection device according to claim 6, characterized in that: The set threshold is that the increment of the on-resistance of the power switch tube does not exceed 20% of the theoretical value of the on-resistance.

8. The protection device according to claim 1, characterized in that: The protection device also includes a power supply module, which is connected to the control protection module to supply power to the control protection module.

9. The protection device according to claim 1, characterized in that: The power switch tube includes a MOS tube or an IGBT tube.

10. An air conditioning system, characterized in that: The air conditioning system includes an air conditioning protection device according to any one of claims 1 to 9.

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