Anti-electric-shock frequency conversion device and air conditioner outdoor unit
By introducing a power input module, a grounding switch module, and a grounding detection module into the frequency converter, the grounding status of the casing is automatically detected, which solves the safety risks caused by the ungrounded casing during the installation of the frequency converter and achieves safe and reliable use.
Patent Information
- Application Number
- CN202422953541.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-29
AI Technical Summary
During the installation of existing frequency converters, the casing was not effectively grounded, resulting in induced voltage when users touch the casing, posing a safety risk.
Design an anti-electric shock frequency converter, comprising a power input module, a grounding switch module, a grounding detection module, and a control module. It automatically detects whether the casing is grounded and controls the connection status between the power input module and the casing through the grounding switch module to ensure safety.
It automatically disconnects the power input module from the casing when the casing is not grounded, preventing electric shock to the user and improving safety.
Smart Images
Figure CN223625573U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic circuit technology of electrical equipment, and in particular to an anti-electric shock inverter device and an air conditioner outdoor unit. Background Technology
[0002] Existing variable frequency devices, such as air conditioner outdoor units, have a circuit board inside the casing. This circuit board houses a power input module and a variable frequency module. The power input module's input terminal connects to the external AC power supply, while its output terminal connects to the variable frequency module for power. The power input module also has a grounding terminal, which can be directly connected to the casing, utilizing the casing's sheet metal components for grounding. Typically, installers connect the casing to a ground wire or the internal metal components during installation. However, some installers overlook this step, resulting in an induced voltage on the casing relative to the ground. When a person touches the casing, current flows through the person to the ground, causing a numbing sensation. Furthermore, leakage in the variable frequency module poses a safety risk. Utility Model Content
[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes an anti-electric shock inverter device and an air conditioner outdoor unit that automatically detects whether grounding is required, ensuring safe and reliable use.
[0004] An anti-electric shock frequency converter according to a first aspect embodiment of the present invention includes: a housing containing a frequency converter module; a power input module, wherein the input terminal of the power input module is connected to a power supply, and the output terminal of the power input module is connected to the frequency converter module to supply power to the frequency converter module; a grounding switch module, wherein the grounding terminal of the power input module is connected to the input terminal of the grounding switch module, and the output terminal of the grounding switch module is connected to the housing; a grounding detection module, wherein the sampling terminal of the grounding detection module is connected to the grounding terminal of the power input module, and the grounding detection module is used to detect the potential of the grounding terminal of the power input module to form a grounding signal; and a control module connected to the output terminal of the grounding detection module and the controlled terminal of the grounding switch module respectively to control the grounding switch module to switch on and off according to the grounding signal.
[0005] An anti-electric shock frequency converter according to an embodiment of the present utility model has at least the following beneficial effects:
[0006] This utility model relates to an anti-electric shock frequency converter. The power input module is connected to an external AC power supply. The power supply powers the frequency converter module through the power input module. When installing the frequency converter, the installer needs to connect the casing to a ground wire or a metal part on the ground. The grounding switch module is initially in the closed state. When the casing is properly grounded, the grounding terminal of the power input module is grounded through the casing. The grounding detection module detects that the grounding terminal of the power input module is at ground potential, and the control module keeps the grounding switch module closed. At this time, even if the user touches the casing, there will be no numbness. If the installer does not install it properly and the casing is not properly grounded, the grounding detection module detects that the grounding terminal of the power input module is at a charged potential. The control module will control the grounding switch module to switch from the closed state to the open state. The grounding terminal of the power input module is not connected to the casing, and the casing will not be charged. The user will not feel numbness when touching the casing. This design automatically detects whether the ground is properly grounded to prevent users from being electrocuted, making it safe and reliable to use.
[0007] According to some embodiments of the present invention, the grounding detection module includes a voltage divider sampling unit and an isolation unit. The sampling terminal of the voltage divider sampling unit is connected to the input terminal of the power input module and the grounding terminal of the power input module, respectively. The output terminal of the voltage divider sampling unit is connected to the input terminal of the isolation unit, and the output terminal of the isolation unit is connected to the control module.
[0008] According to some embodiments of this utility model, the voltage divider sampling unit includes resistor R1 and resistor R4, the isolation unit includes an optocoupler, the first end of resistor R1 is connected to the input terminal of the power input module, the last end of resistor R1 is connected to the positive terminal of the light emitter of the optocoupler and the first end of resistor R4, the last end of resistor R4 is connected to the negative terminal of the light emitter of the optocoupler, the ground terminal of the power input module and the input terminal of the grounding switch module, and the light receiver of the optocoupler is connected to the control module.
[0009] According to some embodiments of the present invention, the grounding switch module includes a relay coil and a relay switch. The relay coil can drive the relay switch to open or close. The first end of the relay switch is connected to the grounding terminal of the power input module, and the tail end of the relay switch is connected to the housing. The control module is connected to the relay coil to control whether the relay coil is energized.
[0010] According to some embodiments of the present invention, the power input module includes a common-mode inductor assembly L1, a capacitor C2, and a capacitor C5. The common-mode inductor assembly L1 includes a first inductor and a second inductor coupled to each other. The first phase of the input terminal of the power input module is connected to the first end of the capacitor C2 and the first end of the first inductor, respectively. The second phase of the input terminal of the power input module is connected to the first end of the capacitor C5 and the first end of the second inductor, respectively. The tail ends of the first inductor and the tail ends of the second inductor form the output terminal of the power input module. The tail ends of the capacitor C2 and the tail ends of the capacitor C5 are connected to form the ground terminal of the power input module.
[0011] According to some embodiments of the present invention, the power input module includes a resistive-capacitive absorption element ZR1, a resistive-capacitive absorption element ZR2, and a high-voltage discharger DSA1. The first phase of the input terminal of the power input module is connected to the first end of the resistive-capacitive absorption element ZR1 and the first end of the resistive-capacitive absorption element ZR2, respectively. The second phase of the input terminal of the power input module is connected to the tail end of the resistive-capacitive absorption element ZR1. The tail end of the resistive-capacitive absorption element ZR2 is connected to the input terminal of the high-voltage discharger DSA1. The output terminal of the high-voltage discharger DSA1 is connected to the output terminal of the grounding switch module.
[0012] According to some embodiments of the present invention, the outer casing is provided with a grounding component, the outer casing is electrically connected to the grounding component, and the grounding component is used to connect to a ground wire.
[0013] According to some embodiments of this utility model, the outer casing is provided with conductive contacts, which are respectively connected to the grounding component and the output terminal of the grounding switch module.
[0014] The outdoor unit of the air conditioner according to the second aspect of the present invention includes the anti-electric shock inverter device disclosed in any of the above embodiments.
[0015] The outdoor unit of the air conditioner according to the embodiment of this utility model has at least the following beneficial effects:
[0016] The outdoor unit of this air conditioner uses the anti-electric shock inverter device disclosed in any of the above embodiments, which automatically detects whether it is grounded to prevent users from being electrocuted, making it safe and reliable to use.
[0017] Additional aspects and advantages of this 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. Attached Figure Description
[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0019] Figure 1 This is a schematic diagram of the principle structure of one embodiment of the anti-electric shock frequency converter of this utility model;
[0020] Figure 2 This is a circuit diagram of the control module of one embodiment of the anti-electric shock frequency converter of this utility model;
[0021] Figure 3 This is a circuit diagram of the power input module, grounding switch module, and grounding detection module of one embodiment of the anti-electric shock frequency converter of this utility model.
[0022] Figure label:
[0023] Housing 100; Power input module 200; Grounding switch module 300; Relay coil 310; Relay switch 320; Switch driver chip 330; Grounding detection module 400; Voltage divider sampling unit 410; Isolation unit 420; Control module 500; Frequency converter module 600. Detailed Implementation
[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 only used to explain this utility model, and should not be construed as limiting this utility model.
[0025] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] like Figures 1 to 3 As shown, the anti-electric shock frequency converter includes a housing 100, a power input module 200, a grounding switch module 300, a grounding detection module 400, and a control module 500. A frequency converter module 600 (not shown in the figure) is housed within the housing 100. The input terminal of the power input module 200 is connected to a power supply, and its output terminal is connected to the frequency converter module 600 to supply power. The grounding terminal of the power input module 200 is connected to the input terminal of the grounding switch module 300, and its output terminal is connected to the housing 100. The sampling terminal of the grounding detection module 400 is connected to the grounding terminal of the power input module 200. The grounding detection module 400 detects the potential of the grounding terminal of the power input module 200 to form a grounding signal. The control module 500 is connected to both the output terminal of the grounding detection module 400 and the controlled terminal of the grounding switch module 300 to control the on / off state of the grounding switch module 300 based on the grounding signal.
[0029] The housing 100 can be made of conductive materials such as metal or alloy, and can be rectangular or cylindrical. The input terminal of the power input module 200 can be connected to a plug via a wire, and the plug is connected to an external AC power supply. The frequency converter can be an outdoor unit of an air conditioner, a refrigerator, etc. A circuit board is installed inside the housing 100, and the frequency converter module 600 is installed on the circuit board. The frequency converter module 600 includes an inverter circuit composed of at least a plurality of semiconductor switching transistors, an input rectifier circuit composed of at least a plurality of diodes, a transformer, and an output rectifier circuit composed of at least a plurality of diodes, etc. The control module 500 can include an MCU or a CPU and its auxiliary circuits.
[0030] This utility model relates to an anti-electric shock frequency converter. The power input module 200 is connected to an external AC power supply. This power supply powers the frequency converter module 600 via the power input module 200. During installation, the casing 100 needs to be connected to a ground wire or a metal part on the ground. The grounding switch module 300 is initially in a closed state. When the casing 100 is properly grounded, the grounding terminal of the power input module 200 is grounded through the casing 100. The grounding detection module 400 detects that the grounding terminal of the power input module 200 is at ground potential, and the control module 500 maintains the grounding switch module 300 in a closed state. When the power input module 200 is closed, even if the user touches the outer casing 100, there will be no numbness. If the installation is improper and the outer casing 100 fails to be properly grounded, the grounding detection module 400 will detect that the grounding terminal of the power input module 200 is at a charged potential. The control module 500 will then control the grounding switch module 300 to switch from the closed state to the open state. Since the grounding terminal of the power input module 200 is not connected to the outer casing 100, the outer casing 100 will not be charged, and the user will not experience numbness when touching the outer casing 100. This design automatically detects whether the grounding is correct to prevent electric shock to the user, making it safe and reliable to use.
[0031] In some embodiments of this utility model, the grounding detection module 400 includes a voltage divider sampling unit 410 and an isolation unit 420. The sampling terminal of the voltage divider sampling unit 410 is connected to the input terminal of the power input module 200 and the grounding terminal of the power input module 200, respectively. The output terminal of the voltage divider sampling unit 410 is connected to the input terminal of the isolation unit 420, and the output terminal of the isolation unit 420 is connected to the control module 500.
[0032] The voltage divider sampling unit 410 detects the voltage drop between the input terminal and the ground terminal of the power input module 200. When the ground terminal of the power input module 200 is not grounded, the voltage drop is small, and the grounding signal feeds back the magnitude of the voltage drop. The grounding signal is input to the control module 500 through the isolation unit 420. The control module 500 controls the grounding switch module 300 to open according to the grounding signal. When the ground terminal of the power input module 200 is grounded, the voltage drop is large, and the control module 500 keeps the grounding switch module 300 closed according to the grounding signal.
[0033] The isolation unit 420 can isolate interference signals input to the input terminal of the power input module 200, ensuring the stable operation of the control module 500.
[0034] Specifically, the voltage divider sampling unit 410 includes resistors R1 and R4, the isolation unit 420 includes an optocoupler, the first end of resistor R1 is connected to the input terminal of the power input module 200, the last end of resistor R1 is connected to the positive terminal of the light emitter of the optocoupler and the first end of resistor R4, the last end of resistor R4 is connected to the negative terminal of the light emitter of the optocoupler, the ground terminal of the power input module 200 and the input terminal of the grounding switch module 300, the light receiver of the optocoupler is connected to the control module 500, wherein the input terminal of the light receiver of the optocoupler is connected to a 5V power supply, and the output terminal of the light receiver of the optocoupler is connected to the control module 500.
[0035] In some embodiments of this utility model, such as Figure 3 As shown, the grounding switch module 300 includes a relay coil 310 and a relay switch 320. The relay coil 310 can drive the relay switch 320 to switch on and off. The first end of the relay switch 320 is connected to the grounding terminal of the power input module 200, and the tail end of the relay switch 320 is connected to the housing 100. The control module 500 is connected to the relay coil 310 to control whether the relay coil 310 is energized.
[0036] When the relay coil 310 is energized, it can drive the relay switch 320 to close. Specifically, the grounding switch module 300 also includes a switch driver chip 330. The switch driver chip 330 and the relay coil 310 are connected to form a drive branch. The drive branch is connected to the power supply. The control module 500 is connected to the switch driver chip 330. The control module 500 controls the switching of the switch driver chip 330 to control whether the relay coil 310 is energized.
[0037] In some embodiments of this utility model, such as Figure 3 As shown, the power input module 200 includes a common-mode inductor assembly L1, a capacitor C2, and a capacitor C5. The common-mode inductor assembly L1 includes a first inductor and a second inductor coupled to each other. The first phase of the input terminal of the power input module 200 is connected to the first end of the capacitor C2 and the first end of the first inductor, respectively. The second phase of the input terminal of the power input module 200 is connected to the first end of the capacitor C5 and the first end of the second inductor, respectively. The tail ends of the first inductor and the tail ends of the second inductor form the output terminal of the power input module 200. The tail ends of the capacitor C2 and the tail ends of the capacitor C5 are connected to form the ground terminal of the power input module 200.
[0038] Through the voltage division of the common-mode inductor component L1, capacitor C2, and capacitor C5, the voltage difference between the first and second phases of the power input module 200 input terminal and the ground terminal is half of the input voltage, thereby further improving the safety level for users.
[0039] In some embodiments of this utility model, the power input module 200 includes a resistive-capacitive absorption element ZR1, a resistive-capacitive absorption element ZR2, and a high-voltage discharger DSA1. The first phase of the input terminal of the power input module 200 is connected to the first end of the resistive-capacitive absorption element ZR1 and the first end of the resistive-capacitive absorption element ZR2, respectively. The second phase of the input terminal of the power input module 200 is connected to the tail end of the resistive-capacitive absorption element ZR1. The tail end of the resistive-capacitive absorption element ZR2 is connected to the input terminal of the high-voltage discharger DSA1. The output terminal of the high-voltage discharger DSA1 is connected to the output terminal of the grounding switch module 300.
[0040] When the input voltage is too high, the RC snubber elements ZR1 and ZR2 can break down and release the accumulated voltage. When the RC snubber element ZR2 breaks down, it can be grounded through the high voltage discharger DSA1 to further ensure safety.
[0041] In some embodiments of this utility model, the outer casing 100 is provided with a grounding component (not shown in the figure), the outer casing 100 is electrically connected to the grounding component, the grounding component is used to connect to the ground wire, the grounding component is made of conductive material, and when installing the frequency converter, the installer connects the grounding component to the ground wire or places it in a metal or alloy component on the ground.
[0042] In some embodiments of this utility model, the outer casing 100 is provided with conductive contacts (not shown in the figure), and the conductive contacts are respectively connected to the grounding component and the output terminal of the grounding switch module 300.
[0043] The outdoor unit of the air conditioner according to the second aspect of the present invention includes the anti-electric shock inverter device disclosed in any of the above embodiments.
[0044] The outdoor unit of this air conditioner uses the anti-electric shock inverter device disclosed in any of the above embodiments, which automatically detects whether it is grounded to prevent users from being electrocuted, making it safe and reliable to use.
[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A frequency converter with anti-electric shock function, characterized in that, include: The outer casing houses the frequency conversion module. A power input module, wherein the input terminal of the power input module is used to connect to a power supply, and the output terminal of the power input module is connected to the frequency converter module to supply power to the frequency converter module; A grounding switch module, wherein the grounding terminal of the power input module is connected to the input terminal of the grounding switch module, and the output terminal of the grounding switch module is connected to the housing; A grounding detection module, wherein the sampling terminal of the grounding detection module is connected to the grounding terminal of the power input module, and the grounding detection module is used to detect the potential of the grounding terminal of the power input module to form a grounding signal; The control module is connected to the output terminal of the grounding detection module and the controlled terminal of the grounding switch module respectively to control the on / off state of the grounding switch module according to the grounding signal.
2. The anti-electric shock frequency converter according to claim 1, characterized in that: The grounding detection module includes a voltage divider sampling unit and an isolation unit. The sampling terminal of the voltage divider sampling unit is connected to the input terminal of the power input module and the grounding terminal of the power input module, respectively. The output terminal of the voltage divider sampling unit is connected to the input terminal of the isolation unit, and the output terminal of the isolation unit is connected to the control module.
3. The anti-electric shock frequency converter according to claim 2, characterized in that: The voltage divider sampling unit includes resistors R1 and R4. The isolation unit includes an optocoupler. The first end of resistor R1 is connected to the input terminal of the power input module. The second end of resistor R1 is connected to the positive terminal of the light emitter of the optocoupler and the first end of resistor R4. The second end of resistor R4 is connected to the negative terminal of the light emitter of the optocoupler, the ground terminal of the power input module, and the input terminal of the grounding switch module. The light receiver of the optocoupler is connected to the control module.
4. The anti-electric shock frequency converter according to claim 1, characterized in that: The grounding switch module includes a relay coil and a relay switch. The relay coil can drive the relay switch to open or close. The first end of the relay switch is connected to the grounding terminal of the power input module, and the tail end of the relay switch is connected to the housing. The control module is connected to the relay coil to control whether the relay coil is energized.
5. The anti-electric shock frequency converter according to claim 1, characterized in that: The power input module includes a common-mode inductor assembly L1, a capacitor C2, and a capacitor C5. The common-mode inductor assembly L1 includes a first inductor and a second inductor coupled to each other. The first phase of the input terminal of the power input module is connected to the first end of the capacitor C2 and the first end of the first inductor, respectively. The second phase of the input terminal of the power input module is connected to the first end of the capacitor C5 and the first end of the second inductor, respectively. The tail ends of the first inductor and the tail ends of the second inductor form the output terminal of the power input module. The tail ends of the capacitor C2 and the tail ends of the capacitor C5 are connected to form the ground terminal of the power input module.
6. The anti-electric shock frequency converter according to claim 5, characterized in that: The power input module includes a resistive-capacitive absorption element ZR1, a resistive-capacitive absorption element ZR2, and a high-voltage discharger DSA1. The first phase of the input terminal of the power input module is connected to the first end of the resistive-capacitive absorption element ZR1 and the first end of the resistive-capacitive absorption element ZR2, respectively. The second phase of the input terminal of the power input module is connected to the tail end of the resistive-capacitive absorption element ZR1. The tail end of the resistive-capacitive absorption element ZR2 is connected to the input terminal of the high-voltage discharger DSA1. The output terminal of the high-voltage discharger DSA1 is connected to the output terminal of the grounding switch module.
7. The anti-electric shock frequency converter according to claim 1, characterized in that: The outer casing is provided with a grounding component, and the outer casing is electrically connected to the grounding component, which is used to connect to the ground wire.
8. The anti-electric shock frequency converter according to claim 7, characterized in that: The outer casing is provided with conductive contacts, which are respectively connected to the grounding component and the output terminal of the grounding switch module.
9. An outdoor unit for an air conditioner, characterized in that, Includes the anti-electric shock frequency converter as described in any one of claims 1 to 8.