A smart multimeter with isolated circuit finder

Abstract

The utility model discloses a kind of intelligent multimeter with isolated circuit breaker finder, it includes: shell, first cavity and second cavity isolated from each other are arranged in it;Circuit breaker finder transmitting module is set in first cavity, and circuit breaker finder transmitting module is electrically connected display module;Multimeter module is set in second cavity, and multimeter module is electrically connected display module;First independent power supply is set in shell;Second independent power supply is set in shell interface. Through the physical cavity isolation of first cavity and second cavity and independent power supply system, fundamentally eliminate the damage risk caused by high-voltage crosstalk or instantaneous pulse to precise circuit breaker finder transmitting module when multimeter is measured high voltage, large current;Also avoid the electromagnetic interference of circuit breaker finder transmitting module to multimeter module measurement accuracy and stability.This ensures the long-term operation stability of equipment in complex electrician environment and the personal safety of operator.

Description

Technical Field

[0001] This utility model relates to the field of electrical testing technology, and in particular to a smart multimeter with an isolated circuit breaker locator. Background Technology

[0002] In the field of electrical testing and repair, multimeters and circuit breakers are two commonly used and complementary electrical testing tools. Multimeters are mainly used to measure basic electrical parameters such as voltage, current, and resistance to help technicians determine the circuit status; while circuit breakers are used to quickly identify and locate the corresponding circuit breaker in the distribution box, or to check whether the socket wiring is correct or whether there is any abnormality in the leakage protection function.

[0003] Currently, these two devices are usually sold as separate products, requiring technicians to carry and use both simultaneously when conducting comprehensive circuit troubleshooting. For example, when troubleshooting a power outage at a socket, technicians must first use a multimeter to measure the socket voltage to confirm if there is a power supply abnormality; then, they must switch to a circuit breaker finder, insert it into the socket, and take the receiver to the distribution box to locate the corresponding circuit breaker. This process involves repeated switching, connecting, and moving of equipment, which is not only cumbersome and inefficient but also increases the risk of equipment being missed or misused.

[0004] While some have attempted to integrate multiple testing functions into a single device, simply placing the multimeter and circuit breaker circuitry together in the same housing without effective isolation poses serious safety hazards. For example, during high-voltage measurements with the multimeter, if the circuit breaker input port is not physically or electrically isolated, high voltage may enter the circuitry, causing equipment damage or even electric shock. Furthermore, if the two devices share a power supply or signal processing circuitry, mutual interference may occur, affecting measurement accuracy and equipment reliability. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide an intelligent multimeter with an isolated circuit breaker finder, which can effectively guarantee measurement accuracy while ensuring operational safety.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a smart multimeter with an isolated circuit breaker finder, comprising: The housing has a first cavity and a second cavity that are isolated from each other. The display module is located on the front side of the housing; The circuit breaker for locating the transmitter module is located within the first cavity. A multimeter module is disposed in the second cavity, and the multimeter module is electrically connected to the display module; A first independent power supply is located inside the housing and is electrically connected to the circuit breaker detection transmitter module; A second independent power supply is located inside the housing and is electrically connected to the multimeter module.

[0007] Preferably, the housing includes a front shell and a bottom shell, which are detachably connected.

[0008] Preferably, a first power supply compartment and a second power supply compartment are provided on the rear side of the bottom shell, the first independent power supply is disposed in the first power supply compartment, the second independent power supply is disposed in the second power supply compartment, and the first power supply compartment and the second power supply compartment are sealed by a power supply cover.

[0009] Preferably, a support frame is rotatably connected to the rear side of the bottom shell.

[0010] Preferably, the circuit breaker detection transmitter module includes: The main control circuit for transmitting is used to control the working status of the circuit breaker detection transmitting module; The signal detection circuit is used to detect signal changes in the circuit and works with the circuit breaker receiver to determine whether there is an open circuit. The power supply circuit provides a stable power supply for the entire circuit breaker detection and transmission module; Status indicator circuit is used to display the transmitter's operating status.

[0011] Preferably, the circuit breaker detection transmitter module further includes an LED lighting driver circuit for controlling the on / off state of the LED lights to provide auxiliary lighting for circuit breaker detection.

[0012] Preferably, the multimeter module includes a multimeter measurement circuit, a multimeter battery voltage conversion circuit, a multimeter input interface circuit, a multimeter LCD display driving circuit, a multimeter backlight driving circuit, and a multimeter buzzer circuit.

[0013] Preferably, The multimeter's measuring circuit is used to measure parameters such as voltage, current, and resistance. The multimeter battery voltage conversion circuit is responsible for providing a stable power supply; The multimeter input interface circuit is used to connect the measuring probe and receive input signals; The multimeter LCD display driver circuit is responsible for driving the LCD screen to display the measurement results; The multimeter backlight driver circuit is used to control the backlight of the LCD screen. The multimeter buzzer circuit is responsible for emitting an audible prompt.

[0014] The beneficial effects of this utility model are as follows: (1) This utility model, through the physical isolation of the first cavity and the second cavity and the independent power supply system, fundamentally eliminates the risk of damage to the precision circuit breaker detection transmitter module caused by high voltage crosstalk or instantaneous pulses when the multimeter measures high voltage and high current; at the same time, it also avoids electromagnetic interference from the circuit breaker detection transmitter module to the measurement accuracy and stability of the multimeter module. This ensures the long-term operational stability of the equipment in complex electrical environments and the personal safety of the operator.

[0015] (2) Since the multimeter module is in an independent and clean electrical environment, it is not affected by the strong interference signal generated when the circuit breaker is working, thus it can always maintain high precision and high stability measurement performance, ensuring accurate reading of key parameters such as voltage, current and resistance.

[0016] (3) The functions of two independent devices are integrated into one handheld device. When troubleshooting, technicians do not need to switch or pick up different devices repeatedly. They can complete the entire process from parameter measurement to circuit breaker location by using this integrated device. This greatly simplifies the operation steps and shortens the troubleshooting time. It is especially suitable for use in narrow or complex field environments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0018] Figure 1 This invention provides a schematic diagram of the structure of a smart multimeter with an isolated circuit breaker locator as an embodiment of the present invention; Figure 2 A cross-sectional structural diagram of a smart multimeter with an isolated circuit breaker is provided for an embodiment of this utility model; Figure 3 A circuit diagram of the main control circuit for the circuit breaker detection transmission module provided in this embodiment of the utility model; Figure 4 A circuit diagram of the signal detection circuit of the circuit breaker detection transmitter module provided in this embodiment of the utility model; Figure 5 A circuit diagram of the power supply circuit of the circuit breaker detection transmitter module provided for an embodiment of this utility model; Figure 6 A circuit diagram of the status indicator light circuit of the circuit breaker detection transmitter module provided in this embodiment of the utility model; Figure 7A circuit diagram of the LED lighting drive circuit of the circuit breaker detection transmitter module provided in this embodiment of the utility model; Figure 8 A circuit diagram of the programming interface circuit for the circuit breaker detection transmitter module provided in this embodiment of the utility model; Figure 9 A circuit diagram of the multimeter measurement circuit of the multimeter module provided in this embodiment of the utility model; Figure 10 A circuit diagram of the multimeter battery voltage conversion circuit of the multimeter module provided in this embodiment of the utility model; Figure 11 A circuit diagram of the multimeter input interface circuit of the multimeter module provided in this embodiment of the utility model; Figure 12 A circuit diagram of the multimeter LCD display driving circuit of the multimeter module provided in this embodiment of the utility model; Figure 13 A circuit diagram of the multimeter backlight driving circuit of the multimeter module provided in this embodiment of the utility model; Figure 14 The circuit diagram of the multimeter buzzer circuit of the multimeter module provided in this embodiment of the utility model.

[0019] In the picture: 1. Housing; 11. First cavity; 12. Second cavity; 13. Front shell; 14. Bottom shell; 141. First power supply compartment; 142. Second power supply compartment; 15. Power supply cover; 16. Support frame; 2. Display module; 3. Circuit breaker detection transmitter module; 31. Signal indicator light; 32. First function button; 33. LED lighting; 4. Multimeter module; 41. Second function button; 5. First independent power supply; 6. Second independent power supply. Detailed Implementation

[0020] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0024] like Figure 1 and 2As shown, this utility model provides a smart multimeter with an isolated circuit breaker, comprising: a housing 1, which contains a first cavity 11 and a second cavity 12 that are isolated from each other. The first cavity 11 is located above the second cavity 12. Preferably, a metal shielding plate can be provided between the first cavity 11 and the second cavity 12 to isolate and shield them from each other, preventing signal interference; a display module 2, disposed on the front side of the housing 1; a circuit breaker detection transmitter 3, disposed in the first cavity 11. A first function button 32 and a signal indicator light 31 are disposed on the front side of the housing 1 near the top. The first function button is used to control the operation of the circuit breaker detection transmitter 3, and the signal indicator light 31 is used to display the measurement status; three input ports for circuit breaker detection (L-live wire, N-neutral wire, E-ground wire) are correspondingly disposed on the top of the housing 1. It should be noted that the circuit breaker detection transmitter needs to be used in conjunction with a circuit breaker detection receiver. The circuit breaker detection receiver is existing technology and will not be described in detail here.

[0025] Multimeter module 4 is disposed in the second cavity 12 and is electrically connected to the display module 2; a second function button 41 is disposed on the front side of the housing 1 near the bottom, and the second function button 41 is used to control the operation of multimeter module 4; three multimeter input jacks (COM, VΩ, mA) are disposed on the bottom of the housing 1.

[0026] The first independent power supply 5 is located inside the housing 1 and is electrically connected to the circuit breaker detection transmitter module 3. The first independent power supply 5 is an independent 9V battery. The second independent power supply 6 is located inside the housing 1 and is electrically connected to the multimeter module 4. The second independent power supply 6 is a separate battery and is independent of the first independent power supply 5.

[0027] This invention, through physical isolation of the first cavity 11 and the second cavity 12 and an independent power supply system, eliminates the direct electrical connection between the multimeter module 4 and the circuit breaker detection transmitter module 3. This fundamentally eliminates the risk of damage to the precision circuit breaker detection transmitter module 3 caused by high-voltage crosstalk or instantaneous pulses when the multimeter measures high voltage and high current. Simultaneously, it also avoids electromagnetic interference from the circuit breaker detection transmitter module 3 on the measurement accuracy and stability of the multimeter module 4. This ensures the long-term operational stability of the equipment in complex electrical environments and the personal safety of the operator.

[0028] In some embodiments, to facilitate the disassembly and assembly of internal modules, the housing 1 includes a front shell 13 and a bottom shell 14, which are detachably connected.

[0029] In some embodiments, a first power compartment 141 and a second power compartment 142 are provided on the rear side of the bottom shell 14. The first independent power supply 5 is disposed in the first power compartment 141, and the second independent power supply 6 is disposed in the second power compartment 142. The first power compartment 141 and the second power compartment 142 are sealed by a power cover 15, and the first independent power supply 5 and the second independent power supply 6 are independent of each other.

[0030] In some embodiments, a support frame 16 is rotatably connected to the rear side of the bottom shell 14. The support frame 16 can be opened during measurement, allowing the entire testing instrument to stand at an angle for convenient testing.

[0031] In some embodiments, such as Figures 3 to 8 As shown, the circuit breaker detection transmitter module 3 includes: Figure 3 As shown, the main control circuit is used to control the working state of the circuit breaker detection transmission module 3. Specifically, the main control circuit performs control signal output, signal processing, status indication, and communication. It generates control signals according to a preset program to drive other circuits, such as controlling the switching of the LED lighting 33 and adjusting the parameters of the signal detection circuit. During signal processing, it receives feedback information from the signal detection circuit, processes and analyzes the signal, and determines the circuit status. During status indication, it controls the status indicator circuit based on the detection results to display the current working status (e.g., normal, open circuit, fault). During communication, it connects to external devices (e.g., a programmer) through a programming interface for program programming and debugging. The signal detection circuit, power supply circuit, status indicator circuit, and LED lighting drive circuit are all electrically connected to the main control circuit.

[0032] Figure 4 As shown, the signal detection circuit is used to detect signal changes in the circuit and works in conjunction with the open circuit detection receiver to determine whether an open circuit exists. Specifically, it collects signals such as current, voltage, or impedance in the circuit through detection elements (three input ports on the top of housing 1). The collected weak signals are amplified and filtered to improve the signal-to-noise ratio, making them more suitable for subsequent analysis. The processed signal is compared with a preset threshold to determine whether the circuit is open. If the signal is below the threshold, it may indicate an open circuit, and the detection result is transmitted to the main control circuit.

[0033] Figure 5 As shown, the power supply circuit provides a stable power supply for the entire circuit breaker detection and transmission module 3; specifically, the power supply circuit obtains electrical energy from the first independent power supply 5 and converts the input voltage into a voltage suitable for the operation of each module through a voltage regulator circuit.

[0034] Figure 6As shown, the status indicator circuit is used to display the transmitter's operating status. Specifically, a signal indicator 31 is provided on the front side of the housing 1. Through different colors or flashing patterns, it displays the device's operating status, such as normal operation, open circuit detection in progress, and open circuit alarm, providing users with intuitive feedback and facilitating operation and maintenance.

[0035] Figure 7 As shown, the circuit breaker detection transmitter module 3 also includes an LED lighting drive circuit. An LED lighting lamp 33 is provided on the rear side of the housing 1 near the top, which is used to control the on and off of the LED lamp and provide auxiliary lighting for circuit breaker detection.

[0036] Figure 8 As shown, the circuit breaker detection and transmission module 3 also includes a programming interface circuit, which is connected to an external device (such as a programmer) through the programming interface for programming and debugging.

[0037] In some embodiments, such as Figures 9 to 14 As shown, the multimeter module 4 includes a multimeter measurement circuit, a multimeter battery voltage conversion circuit, a multimeter input interface circuit, a multimeter LCD display driving circuit, a multimeter backlight driving circuit, and a multimeter buzzer circuit. Specifically, the multimeter battery voltage conversion circuit, the multimeter input interface circuit, the multimeter LCD display driving circuit, the multimeter backlight driving circuit, and the multimeter buzzer circuit are electrically connected to the multimeter measurement circuit.

[0038] Figure 9 As shown, the multimeter measurement circuit is used to measure parameters such as voltage, current, and resistance. Specifically, the multimeter measurement circuit uses an SD7835A chip to measure parameters such as voltage, current, and resistance. Through the design of the measurement circuit, measurement needs for different ranges can be met, such as a voltage measurement range from 400.0mV to 600V, a current measurement range from 40.00mA to 11.00A, and a resistance measurement range from 400.0Ω to 40.00MΩ.

[0039] Figure 10 As shown, the multimeter battery voltage conversion circuit is responsible for providing a stable power supply. Through the voltage conversion chip, it converts the battery voltage into a stable voltage required by the circuit, ensuring the normal operation of the measurement circuit.

[0040] Figure 11 As shown, the multimeter input interface circuit is responsible for connecting the measurement probe and receiving input signals. Through the design of the input interface circuit, it is possible to receive and process different measurement signals.

[0041] Figure 12As shown, the multimeter's LCD display driver circuit is responsible for driving the LCD screen to display the measurement results. This circuit uses an LCD driver chip to drive the LCD screen (i.e., display module 2) to display the measurement results. Through the design of the LCD display driver circuit, the measurement results can be clearly displayed, making it convenient for users to read.

[0042] Figure 13 As shown, the multimeter backlight driver circuit is responsible for controlling the backlight of the LCD screen; this circuit controls the backlight of the LCD screen. Through the design of the backlight driver circuit, the backlight brightness can be automatically adjusted according to the intensity of ambient light, improving screen readability.

[0043] Figure 14 As shown, the multimeter buzzer circuit is responsible for issuing audible alerts. During the measurement process, the buzzer will sound an audible alert when the measurement result meets specific conditions, such as in continuity tests or diode tests.

[0044] In this embodiment of the invention, the user selects the measurement function via buttons on the multimeter's measurement circuit. The measurement circuit receives the input signal, amplifies and filters it, and then transmits the result to the LCD display driver module. The LCD screen displays the measurement result, the backlight driver module adjusts the backlight brightness according to the ambient light, and the buzzer module emits an audible alert under specific conditions.

[0045] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A smart multimeter with an isolated circuit breaker finder, characterized in that, include: The housing has a first cavity and a second cavity that are isolated from each other. The display module is located on the front side of the housing; The circuit breaker for locating the transmitter module is located within the first cavity. A multimeter module is disposed in the second cavity, and the multimeter module is electrically connected to the display module; A first independent power supply is located inside the housing and is electrically connected to the circuit breaker detection transmitter module; A second independent power supply is located inside the housing and is electrically connected to the multimeter module.

2. The smart multimeter with an isolated circuit breaker finder according to claim 1, characterized in that, The housing includes a front shell and a bottom shell, which are detachably connected.

3. A smart multimeter with an isolated circuit breaker finder according to claim 2, characterized in that, The rear side of the bottom shell is provided with a first power supply compartment and a second power supply compartment. The first independent power supply is located in the first power supply compartment, and the second independent power supply is located in the second power supply compartment. The first power supply compartment and the second power supply compartment are sealed by a power supply cover.

4. A smart multimeter with an isolated circuit breaker finder according to claim 3, characterized in that, A support frame is also rotatably connected to the rear side of the bottom shell.

5. A smart multimeter with an isolated circuit breaker finder according to claim 1, characterized in that, The circuit breaker detection and transmission module includes: The main control circuit for transmitting is used to control the working status of the circuit breaker detection transmitting module; The signal detection circuit is used to detect signal changes in the circuit and works with the circuit breaker receiver to determine whether there is an open circuit. The power supply circuit provides a stable power supply for the entire circuit breaker detection and transmission module; Status indicator circuit is used to display the transmitter's operating status.

6. A smart multimeter with an isolated circuit breaker finder according to claim 5, characterized in that, The circuit breaker detection transmitter module also includes an LED lighting driver circuit, which controls the LED lights to turn on and off, providing auxiliary lighting for circuit breaker detection.

7. A smart multimeter with an isolated circuit breaker finder according to claim 1, characterized in that, The multimeter module includes a multimeter measurement circuit, a multimeter battery voltage conversion circuit, a multimeter input interface circuit, a multimeter LCD display driving circuit, a multimeter backlight driving circuit, and a multimeter buzzer circuit.

8. A smart multimeter with an isolated circuit breaker finder according to claim 7, characterized in that, The multimeter's measuring circuit is used to measure parameters such as voltage, current, and resistance. The multimeter battery voltage conversion circuit is responsible for providing a stable power supply; The multimeter input interface circuit is used to connect the measuring probe and receive input signals; The multimeter LCD display driver circuit is responsible for driving the LCD screen to display the measurement results; The multimeter backlight driver circuit is used to control the backlight of the LCD screen. The multimeter buzzer circuit is responsible for emitting an audible prompt.

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