Electric leakage detection protection device and vibration table power supply test system

Abstract

The utility model relates to the technical field of vibration table power supply test, and discloses an electric leakage detection protection device and a vibration table power supply test system, the device comprises an electrical cabinet, the output end of the electrical cabinet is connected with an external vibration table, and the electrical cabinet comprises a power amplifier, a Hall sensor and a central processor; the central processing unit obtains a positive voltage signal and a negative voltage signal of the same loop of the power amplifier through the Hall sensor, performs numerical comparison on the positive voltage signal and the negative voltage signal to obtain a difference value, and judges that the power amplifier leaks electricity when the difference value exceeds a preset reference value. According to the utility model, whether the internal cable leaks electricity or not when the power amplifier is in a working state is directly detected under the condition that an external detection device is not connected, and the problem that whether the cable leaks electricity or not cannot be directly detected under the condition that the external detection device is not connected is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration table power supply test, in particular to a leakage detection protection device and a vibration table power supply test system. Background Art

[0002] Cable leakage in vibration table power supply systems can pose numerous risks. For electrical equipment, this can cause damage to the equipment or internal components. Insulation damage can also cause electrical charges to flow through the equipment casing, potentially leading to electric shock. Currently, there are no commercially available systems for automatically detecting leakage in the cables of vibration table power amplifiers. Designing a system to detect and protect against leakage in electrical equipment can minimize the damage to equipment and personnel caused by this. For vibration table power amplifiers, the primary challenge lies in the inability to directly detect cable leakage and trigger a timely alarm without connecting an external detection device within the limited space available for the equipment while it is operating. Utility Model Content

[0003] In view of this, the utility model provides a leakage detection protection device and a vibration table power supply test system to solve the problem that it is impossible to directly detect whether the cable has leakage without connecting an external detection device.

[0004] In a first aspect, the utility model provides a leakage detection and protection device, which includes an electrical cabinet, an output end of which is connected to an external vibration table, and the electrical cabinet includes a power amplifier, a Hall sensor, and a central processing unit;

[0005] The central processing unit obtains the positive voltage signal and negative voltage signal of the same circuit of the power amplifier through the Hall sensor, and compares the positive voltage signal and the negative voltage signal to obtain the difference. When the difference exceeds the preset reference value, it is determined that the power amplifier is leaking.

[0006] The utility model provides a leakage detection protection device. A central processing unit collects positive voltage signals and negative voltage signals of the same circuit of a power amplifier through a Hall sensor, and compares the positive voltage signal with the negative voltage signal to obtain a difference. When the difference exceeds a preset reference value, it is determined that the power amplifier is leaking. The Hall sensor ensures that no electrical quantity in the DC system of the detected power amplifier is added by an external signal, thereby achieving reliable insulation and good anti-interference ability of the detected system, and directly detecting whether the internal cable of the power amplifier is leaking when it is in a working state without connecting to an external detection device, thereby solving the problem of being unable to directly detect whether the cable is leaking when the external detection device is not connected.

[0007] In an optional embodiment, the Hall sensor is connected to the positive output circuit and the negative output circuit of the power amplifier. The Hall sensor is used to collect the positive current signal of the positive output circuit of the power amplifier and the negative current signal of the negative output circuit of the power amplifier, and convert the positive current signal and the negative current signal into a positive voltage signal and a negative voltage signal respectively.

[0008] The utility model provides a leakage detection protection device, which is connected to the positive output circuit and the negative output circuit of the power amplifier through a Hall sensor, thereby achieving the purpose of collecting the positive current signal of the positive output circuit of the power amplifier and the negative current signal of the negative output circuit of the power amplifier and converting them into corresponding voltage signals. There is no need to inject signals into the system or make any electrical connections with the system, which provides conditions for the central processing unit to compare the numerical values of the positive voltage signal and the negative voltage signal.

[0009] In an optional embodiment, the electrical cabinet also includes an amplifying element, which is connected between the Hall sensor and the central processing unit. The amplifying element is used to receive the positive voltage signal and the negative voltage signal output by the Hall sensor, and offset and amplify the positive voltage signal and the negative voltage signal respectively before transmitting them to the central processing unit.

[0010] The utility model provides a leakage detection protection device, which performs offset amplification processing on a voltage signal through an amplifying element, and can increase the amplitude or power of the signal, so that the voltage signal can be better transmitted and processed in the leakage detection protection device.

[0011] In an optional embodiment, the electrical cabinet further includes an optocoupler isolation chip and a PLC controller, wherein the optocoupler isolation chip is connected to the central processing unit and the PLC controller respectively;

[0012] When the power amplifier leaks electricity, the central processing unit sends an error signal which is transmitted to the PLC controller through the optocoupler isolation chip, and the PLC controller cuts off the external power supply for the power amplifier.

[0013] The utility model provides a leakage detection protection device. When a power amplifier leaks electricity, the central processing unit sends an error signal that is transmitted to the PLC controller through the optical coupling isolation chip. The PLC controller cuts off the external power supply for the power amplifier, thereby achieving the purpose of the PLC controller responding to the alarm and cutting off the power supply to protect the power amplifier.

[0014] In an optional embodiment, the central processing unit includes a single-chip microcomputer and a digital comparator connected to each other; the single-chip microcomputer is used to transmit the positive voltage signal and the negative voltage signal of the same circuit of the power amplifier to the digital comparator, and the digital comparator is used to perform a numerical comparison on the positive voltage signal and the negative voltage signal to obtain a difference and to determine whether the difference exceeds a preset reference value.

[0015] The utility model provides a leakage detection protection device, which realizes rapid calculation between positive voltage signal and negative voltage signal and between difference and reference value through single chip microcomputer and digital comparator, thus providing conditions for detecting leakage and responding to alarm in time.

[0016] In an optional implementation, the single chip microcomputer includes a first input port and a second input port, and both the first input port and the second input port are connected to the amplifying element.

[0017] The utility model provides a leakage detection protection device, which is connected to an amplifier element through a first input port and a second input port of a single chip computer, thereby achieving the purpose of voltage input of the single chip computer adapted to different power supply requirements.

[0018] In an optional embodiment, the single chip microcomputer further includes a third port, the optocoupler isolation chip includes a first pin, a second pin, a third pin, and a fourth pin; the PLC controller includes an acquisition port and a power supply port;

[0019] The first pin is connected to the third port, the second pin is grounded, the third pin is connected to the acquisition port, and the fourth pin is connected to the power port.

[0020] The utility model provides a leakage detection protection device, which achieves the purpose of smoothly transmitting the error voltage signal to the PLC controller by connecting the first pin, the second pin, the third pin and the fourth pin of the optical coupling isolation chip with the single-chip microcomputer and the PLC controller, thereby providing conditions for the PLC controller to promptly respond to the alarm and cut off the power supply to the power amplifier.

[0021] In an optional implementation, the single chip microcomputer is grounded.

[0022] In an optional embodiment, the power amplifier includes an input bus, an H-bridge inverter, a drive circuit, an output filter circuit, and a power component interface;

[0023] The output filter circuit is connected to the input bus and the H-bridge inverter respectively, the H-bridge inverter is connected to the drive circuit, and the output filter circuit is connected to the drive circuit through the power component interface;

[0024] The input bus connects the acquisition port and the external power supply contactor.

[0025] The utility model provides a leakage detection protection device, which realizes the purpose of connecting with an external power supply contactor and a PLC controller through the input bus of the power amplifier, the H-bridge inverter, the drive circuit, the output filter circuit and the power component interface, and provides conditions for subsequently judging whether the power amplifier has leakage and responding to the alarm through positive current signals and negative current signals.

[0026] In a second aspect, the present invention provides a vibration table power supply test system, comprising a vibration table and a leakage detection and protection device according to the first aspect or any corresponding embodiment thereof;

[0027] The output end of the leakage detection protection device is connected to the vibration table. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a structural block diagram of a leakage detection and protection device according to an embodiment of the present utility model;

[0030] Figure 2 This is a block diagram of the judgment logic structure of another leakage detection and protection device according to an embodiment of the present utility model;

[0031] Figure 3 1 is a schematic diagram of a flow chart of current detection by a Hall sensor according to an embodiment of the present utility model;

[0032] Figure 4 1 is a schematic diagram of the basic structure of a power amplifier according to an embodiment of the present utility model;

[0033] Figure 5 This is an internal circuit diagram of the single-chip computer main control unit circuit according to an embodiment of the utility model;

[0034] Figure 6 This is a circuit diagram of an optocoupler isolation chip according to an embodiment of the present utility model.

[0035] Figure 7 The present invention is a structural block diagram of a vibration table power supply test system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal connections between two components; they may refer to wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] The vibration table power amplifier outputs AC power, and its circuits often need to carry high voltages and large currents. Furthermore, cables are installed inside the equipment, where space is limited, making connections to external devices difficult. Therefore, a highly sensitive, non-contact DC current sensor is used to detect the difference between the inflow and outflow currents of the positive and negative output wires to determine the insulation condition of the branch load. Theoretically, the current values should be the same within the same circuit. A difference in the detected current indicates leakage between the positive and negative wires of this branch. Conversely, if there is no current difference, the insulation condition of this branch is considered good.

[0041] The current sensor itself is installed in the power amplifier system to detect branch currents using an inductive element. No signal injection or electrical connection with the power amplifier is required. This ensures that no external signals are added to the DC system of the power amplifier being tested, ensuring reliable insulation of the tested power amplifier. The device also offers excellent anti-interference capabilities, as the signal detected by the current sensor is a DC differential current, which has nothing to do with the distributed capacitance of the power amplifier and the DC system. This utility model provides a leakage detection and protection device that can detect internal cable leakage in a vibration table power amplifier while it is operating, while also extending the device's service life.

[0042] In this embodiment, a leakage detection protection device is provided. Figure 1 This is a structural block diagram of a leakage detection protection device according to an embodiment of the present utility model. Figure 1 As shown, the device includes an electrical cabinet, the output end of which is connected to an external vibration table. The electrical cabinet includes a power amplifier, a Hall sensor and a central processing unit; the central processing unit obtains the positive voltage signal and the negative voltage signal of the same circuit of the power amplifier through the Hall sensor, and compares the positive voltage signal and the negative voltage signal to obtain a difference. When the difference exceeds a preset reference value, it is determined that the power amplifier is leaking.

[0043] In an optional embodiment, the Hall sensor is connected to the positive output circuit and the negative output circuit of the power amplifier. The Hall sensor is used to collect the positive current signal of the positive output circuit of the power amplifier and the negative current signal of the negative output circuit of the power amplifier, and convert the positive current signal and the negative current signal into a positive voltage signal and a negative voltage signal respectively.

[0044] Specifically, if Figure 3 As shown, install the Hall sensor on the positive output (A) and negative output (B) circuits of the power amplifier (as shown in Figure 4 AB is an external vibration table. It collects two sets of current signals, positive and negative, from the same circuit. The Hall effect sensor converts the detected current signals into voltage signals. The central processing unit compares the positive and negative voltage signals to obtain the difference. If the difference exceeds a preset reference value, it determines that the power amplifier is leaking.

[0045] This embodiment provides a leakage detection and protection device. A central processing unit collects positive and negative voltage signals of the same circuit of a power amplifier through a Hall sensor, and performs numerical comparison on the positive and negative voltage signals to obtain a difference. When the difference exceeds a preset reference value, the power amplifier is determined to be leaking. The Hall sensor ensures that no electrical quantities in the DC system of the detected power amplifier are added by external signals, thereby achieving reliable insulation and good anti-interference capabilities of the detected system. It is possible to directly detect whether the internal cable of the power amplifier is leaking when it is in operation without connecting to an external detection device, thereby solving the problem of being unable to directly detect whether the cable is leaking without connecting to an external detection device.

[0046] In an optional embodiment, as Figure 2As shown, the electrical cabinet also includes an amplifier element connected between the Hall sensor and the central processing unit. The amplifier element is used to receive the positive and negative voltage signals output by the Hall sensor, offset and amplify the positive and negative voltage signals, and transmit them to the central processing unit. The central processing unit includes a microcontroller and a digital comparator that are interconnected. The microcontroller is used to transmit the positive and negative voltage signals obtained from the same circuit of the power amplifier to the digital comparator. The digital comparator is used to compare the positive and negative voltage signals to obtain a difference and determine whether the difference exceeds a preset reference value.

[0047] Specifically, if Figure 5 As shown, the microcontroller is an STM32, and the digital comparator is implemented using a comparison circuit known from related art. The microcontroller receives the positive and negative voltage signals and transmits them to the digital comparator. The digital comparator then performs a numerical comparison and difference calculation on the positive and negative voltage signals. The result is compared against a preset reference value. If the difference exceeds the preset reference value, the power amplifier is determined to be leaking. The operating principle of the digital comparator is described in the related art and will not be further elaborated here. If the power amplifier is leaking, the microcontroller issues an error signal.

[0048] The present embodiment provides a leakage detection protection device that uses a single-chip microcomputer and a digital comparator to quickly calculate the difference between a positive voltage signal and a negative voltage signal, and between the difference and a reference value, thereby providing conditions for detecting leakage and responding to alarms in a timely manner.

[0049] The single chip microcomputer includes a first input port and a second input port, both of which are connected to the amplifier element. The first input port is the PA0 port of the STM32 single chip microcomputer, and the second input port is the PA1 port of the STM32 single chip microcomputer.

[0050] In this embodiment, the input voltage signal is offset and amplified by the amplifier element, which can adapt to the A / D input interface requirements of the microcontroller with different power supply requirements.

[0051] In an optional embodiment, the electrical cabinet also includes an optocoupler isolation chip and a PLC controller, and the optocoupler isolation chip is connected to the central processing unit and the PLC controller respectively; when the power amplifier leaks electricity, the central processing unit sends an error signal which is transmitted to the PLC controller through the optocoupler isolation chip, and the PLC controller cuts off the external power supply for the power amplifier.

[0052] Specifically, if Figure 6As shown, the optocoupler isolation chip uses the optocoupler TLP291 chip. The STM32 microcontroller isolates the error signal through the optocoupler TLP291 chip and finally transmits it to the PLC controller. The PLC controller cuts off the external power supply for the power amplifier.

[0053] Among them, the single-chip microcomputer also includes a third port, the optocoupler isolation chip includes a first pin, a second pin, a third pin and a fourth pin; the PLC controller includes an acquisition port and a power port; the first pin is connected to the third port, the second pin is grounded, the third pin is connected to the acquisition port, and the fourth pin is connected to the power port.

[0054] Specifically, if Figure 6 As shown, the first pin of the optocoupler isolation chip is pin 1 (U11 voltage pin), the second pin is pin 2 (GNDD ground pin), the third pin is pin 3 (ERR error pin), and the fourth pin is pin 4 (+24V power pin). Figure 5 As shown, the third port of the MCU is PC12. Pin 1 is connected to the MCU's PC12 port, with a resistor in series for voltage protection. Pin 2 is grounded and shares a common ground with the MCU. Pin 3 is connected to the PLC controller's data acquisition port. Pin 4 is connected to the PLC's +24V power supply port. When there is no leakage alarm, the MCU's PC12 port generates a low-voltage signal, and the optocoupler TLP291 chip is off. When a leakage alarm is generated, the MCU's PC12 port generates a high-voltage signal, turning on the optocoupler TLP291 chip. Pin 3 receives +24V voltage, and the MCU transmits an error signal to the PLC controller's data acquisition port. The PLC data acquisition port alarm is set to normally open. When this data acquisition port receives a +24V alarm signal, it disconnects the contactor that supplies power to the power amplifier bus.

[0055] A leakage detection protection device provided in this embodiment achieves the purpose of smoothly transmitting the error voltage signal to the PLC controller by connecting the first pin, second pin, third pin and fourth pin of the optocoupler isolation chip to the microcontroller and the PLC controller, thereby providing conditions for the PLC controller to promptly respond to the alarm and cut off the power supply to the power amplifier.

[0056] In an optional embodiment, as Figure 4 As shown, the power amplifier includes an input bus, an H-bridge inverter, a drive circuit, an output filter circuit and a power component interface; the output filter circuit is connected to the input bus and the H-bridge inverter respectively, the H-bridge inverter is connected to the drive circuit, and the output filter circuit is connected to the drive circuit through the power component interface; the input bus is connected to the acquisition port and the external power supply contactor.

[0057] Specifically, if Figure 4As shown, the input bus is connected to the P+N- port, the output filter circuit includes an absorption capacitor, and the H-bridge inverter includes four insulated-gate bipolar transistor (IGBT) modules, namely Q1, Q2, Q3, and Q4. The drive circuit is a power device drive circuit. The power amplifier also includes a DC detection component and a temperature detection component, which are used to perform DC detection and temperature detection on the power component interface, respectively. The DC detection component and the temperature detection component are implemented using detectors of related technologies and will not be repeated here.

[0058] When the power amplifier leaks electricity, cut off the external power supply contactor that supplies power to the power amplifier. Figure 4 The P+N- port is powered off, so that its input bus has no voltage, and the power device drive circuit is simultaneously turned off through the power amplifier component interface, stopping the transmission of the four-way pulse drive signal of Q1, Q2, Q3, and Q4 in the H-bridge inverter, and the power amplifier will no longer work.

[0059] This embodiment provides a leakage detection and protection device that uses an STM32 single-chip microcomputer to directly collect the positive and negative voltage signals of the same circuit of a power amplifier and performs analog-to-digital conversion through an internal digital comparator. Therefore, it can be used to detect leakage in both DC and AC circuits. Furthermore, due to the characteristics of the vibration table, the output current can be large or small and can change at any time. The single-chip microcomputer can perform rapid calculations and respond to alarms in a timely manner. Furthermore, the design of an optocoupler isolation chip allows the +3.3V single-chip microcomputer to control the +24V alarm of a PLC controller at a lower voltage.

[0060] The utility model provides a vibration table power supply test system, such as Figure 7 As shown, including the vibration table and the above Figure 1 and Figure 2 The leakage detection and protection device of any corresponding embodiment shown in the figure; the output end of the leakage detection and protection device is connected to the vibration table.

[0061] The further functional description of each component in the above leakage detection and protection device is the same as that of the above corresponding embodiment and will not be repeated here.

[0062] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A leakage detection protection device, characterized in that: The device includes an electrical cabinet, the output end of which is connected to an external vibration table, and the electrical cabinet includes a power amplifier, a Hall sensor and a central processing unit; The central processor obtains the positive voltage signal and negative voltage signal of the same circuit of the power amplifier through the Hall sensor, and compares the positive voltage signal and the negative voltage signal to obtain a difference. When the difference exceeds a preset reference value, it is determined that the power amplifier is leaking.

2. The device according to claim 1, characterized in that The Hall sensor is connected to the positive output circuit and the negative output circuit of the power amplifier. The Hall sensor is used to collect the positive current signal of the positive output circuit of the power amplifier and the negative current signal of the negative output circuit of the power amplifier, and convert the positive current signal and the negative current signal into a positive voltage signal and a negative voltage signal respectively.

3. The device according to claim 2, characterized in that The electrical cabinet also includes an amplifying element, which is connected between the Hall sensor and the central processing unit. The amplifying element is used to receive the positive voltage signal and the negative voltage signal output by the Hall sensor, and offset amplify the positive voltage signal and the negative voltage signal respectively before transmitting them to the central processing unit.

4. The device according to claim 3, characterized in that The electrical cabinet further comprises an optocoupler isolation chip and a PLC controller, wherein the optocoupler isolation chip is connected to the central processing unit and the PLC controller respectively; When the power amplifier leaks electricity, the central processing unit sends an error signal which is transmitted to the PLC controller via the optical coupling isolation chip, and the PLC controller cuts off the external power supply for the power amplifier.

5. The device according to claim 4, characterized in that The central processing unit includes a single-chip microcomputer and a digital comparator connected to each other; the single-chip microcomputer is used to transmit the positive voltage signal and the negative voltage signal of the same circuit of the power amplifier to the digital comparator, and the digital comparator is used to perform a numerical comparison on the positive voltage signal and the negative voltage signal to obtain a difference and determine whether the difference exceeds a preset reference value.

6. The device according to claim 5, characterized in that The single chip microcomputer includes a first input port and a second input port, and the first input port and the second input port are both connected to the amplifying element.

7. The device according to claim 5, characterized in that The single chip microcomputer further includes a third port, the optical coupling isolation chip includes a first pin, a second pin, a third pin and a fourth pin; the PLC controller includes an acquisition port and a power supply port; The first pin is connected to the third port, the second pin is grounded, the third pin is connected to the acquisition port, and the fourth pin is connected to the power port.

8. The device according to claim 6 or 7, characterized in that The single chip microcomputer is grounded.

9. The device according to claim 7, characterized in that The power amplifier includes an input bus, an H-bridge inverter, a drive circuit, an output filter circuit and a power component interface; The output filter circuit is connected to the input bus and the H-bridge inverter respectively, the H-bridge inverter is connected to the drive circuit, and the output filter circuit is connected to the drive circuit through the power component interface; The input bus is connected to the acquisition port and the external power supply contactor.

10. A vibration table power supply test system, characterized in that: comprising a vibration table and a leakage detection and protection device according to any one of claims 1 to 9; The output end of the leakage detection and protection device is connected to the vibration table.

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