Maintenance device

Abstract

The utility model discloses a maintenance device, which relates to the technical field of maintenance, and comprises a main control circuit, a signal generation circuit, a voltage detection circuit, a current detection circuit, a resistance detection circuit and a communication module, the output end of the voltage detection circuit is electrically connected with the detection end of the main control circuit, the output end of the current detection circuit is electrically connected with the detection end of the main control circuit, the output end of the resistance detection circuit is electrically connected with the detection end of the main control circuit, the communication module is electrically connected with the output end of the main control circuit, and the communication module is used for establishing communication connection with an external terminal; the utility model aims to integrate a plurality of functions required by maintenance into the same device, so that the maintenance device can meet the requirements of different maintenance tasks, thereby solving the problems of heavy burden and difficult equipment movement caused by the fact that maintenance personnel need to carry a large amount of equipment when going out.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance, and particularly relates to a maintenance device. Background Art

[0002] Home appliance maintenance equipment is a necessary tool and equipment for maintaining various household appliances. There are various types of it. According to the specific maintenance items and requirements, common home appliance maintenance equipment mainly includes the following: electric soldering pens, multimeters, oscilloscopes, signal generators or spectrum analyzers, etc., which are used to deeply analyze and detect problems of household appliances. However, for maintenance personnel, a large number of the above-mentioned equipment need to be carried for home appliance maintenance, which increases the travel burden of maintenance personnel and makes the movement and handling of the equipment difficult. Content of the Utility Model

[0003] The main purpose of the utility model is to propose a maintenance device, aiming to integrate multiple functions required for maintenance in the same device, so that the maintenance device can meet the needs of different maintenance tasks, thereby solving the problems that maintenance personnel need to carry a large number of equipment when traveling, resulting in heavy burden and difficult movement of the equipment.

[0004] To achieve the above purpose, a maintenance device proposed by the utility model includes:

[0005] A main control circuit;

[0006] A signal generation circuit, the signal generation circuit is electrically connected to the control end of the main control circuit, and the main control circuit is used to control the signal generation circuit to output a sine wave signal, a square wave signal or a triangular wave signal;

[0007] A voltage detection circuit, the output end of the voltage detection circuit is electrically connected to the detection end of the main control circuit, the detection end of the voltage detection circuit is used to check the voltage of the object to be measured, and the voltage detection circuit is used to detect the voltage and output a corresponding voltage detection signal;

[0008] A current detection circuit, the output end of the current detection circuit is electrically connected to the detection end of the main control circuit, the detection end of the current detection circuit is used to check the current of the object to be measured, and the current detection circuit is used to detect the current and output a corresponding current detection signal;

[0009] A resistance detection circuit, the output end of the resistance detection circuit is electrically connected to the detection end of the main control circuit, the detection end of the resistance detection circuit is used to check the resistance of the object to be measured, and the resistance detection circuit is used to detect the resistance value and output a corresponding resistance detection signal;

[0010] The main control circuit is used to output corresponding voltage data, current data or resistance data according to the voltage detection signal, the current detection signal or the resistance detection signal;

[0011] A communication module, which is electrically connected to the output end of the main control circuit and is used to establish a communication connection with an external terminal.

[0012] In one embodiment, the signal generation circuit includes:

[0013] A sine wave generation circuit, a square wave generation circuit, a triangular wave generation circuit, and a plurality of switch components. The output ends of the sine wave generation circuit, the square wave generation circuit, and the triangular wave generation circuit are respectively electrically connected to the input ends of the corresponding switch components through the input ends of the corresponding switch components. The controlled ends of the three switch components are electrically connected to the control end of the main control circuit.

[0014] In one embodiment, the square wave generation circuit includes:

[0015] A first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a first voltage stabilizing diode, and a second voltage stabilizing diode. The inverting end of the first amplifier is respectively electrically connected to the first end of the first resistor and the first end of the first capacitor. The second end of the first capacitor is grounded. The output end of the first amplifier is electrically connected to the first end of the second resistor. The second end of the second resistor is electrically connected to the second end of the first resistor. The non-inverting end of the first amplifier is respectively electrically connected to the first end of the third resistor and the first end of the fourth resistor. The second end of the fourth resistor is grounded. The second end of the third resistor is electrically connected to the second end of the second resistor. The second end of the third resistor is also electrically connected to the anode of the first voltage stabilizing diode. The cathode of the first voltage stabilizing diode is electrically connected to the cathode of the second voltage stabilizing diode. The anode of the second voltage stabilizing diode is grounded. The anode of the first voltage stabilizing diode is electrically connected to the input end of the corresponding switch component.

[0016] In one embodiment, the triangular wave generation circuit includes:

[0017] A second amplifier, a fifth resistor, a sixth resistor, and a second capacitor. The first end of the fifth resistor is connected to the second end of the second resistor. The second end of the fifth resistor is electrically connected to the inverting end of the second amplifier. The first end of the sixth resistor is grounded. The second end of the sixth resistor is electrically connected to the non-inverting end of the second amplifier. The inverting end of the second amplifier is also electrically connected to the first end of the second capacitor. The second end of the second capacitor is electrically connected to the output end of the second amplifier. The output end of the second amplifier is also electrically connected to the input end of the corresponding switch component.

[0018] In one embodiment, the sine wave generation circuit includes:

[0019] A third amplifier, a seventh resistor, an eighth resistor, a ninth resistor, and a third capacitor. A first end of the seventh resistor is electrically connected to an output end of the second amplifier. A second end of the seventh resistor is electrically connected to an inverting end of the third amplifier. The inverting end of the third amplifier is further respectively electrically connected to a first end of the third capacitor and a first end of the eighth resistor. A second end of the eighth resistor and a second end of the third capacitor are both electrically connected to an output end of the third amplifier. The output end of the third amplifier is further electrically connected to an input end of the corresponding switch assembly. A non-inverting end of the third amplifier is electrically connected to a first end of the ninth resistor. A second end of the ninth resistor is grounded.

[0020] In one embodiment, the communication module includes a wireless communication module for establishing a wireless communication connection with a host computer.

[0021] In one embodiment, the voltage detection circuit includes:

[0022] A voltage sensor, a filtering circuit, and an amplifier circuit. The voltage sensor is configured to detect a voltage of a device under test and output a corresponding voltage detection signal. An output end of the voltage sensor is electrically connected to an input end of the filtering circuit. An output end of the filtering circuit is electrically connected to an input end of the amplifier circuit. An output end of the amplifier circuit is electrically connected to a detection end of the main control circuit.

[0023] In one embodiment, the current detection circuit includes:

[0024] A plurality of sampling resistors and a plurality of switching tubes. A first end of each sampling resistor is configured to collect a current of a device under test. Second ends of the plurality of sampling resistors are electrically connected to input ends of the plurality of switching tubes in one-to-one correspondence. Controlled ends of the plurality of switching tubes are all electrically connected to a control end of the main control circuit. Output ends of the plurality of switching tubes are all electrically connected to a detection end of the main control circuit.

[0025] In one embodiment, the maintenance device further includes:

[0026] A probe, a voltage dividing circuit, and a buzzer. A first end of the probe is configured to collect a current of a device under test. A second end of the probe is electrically connected to a first end of the voltage dividing circuit. A second end of the voltage dividing circuit is electrically connected to a detection end of the main control circuit. The buzzer is electrically connected to a control end of the main control circuit.

[0027] In one embodiment, the maintenance device further includes:

[0028] Capacitance detection circuit, the output end of the capacitance detection circuit is electrically connected to the detection end of the main control circuit, and the detection end of the capacitance detection circuit is used to detect the capacitance value of the object to be measured and output a corresponding capacitance detection signal to the main control circuit.

[0029] The overhaul device of the present utility model includes a main control circuit, a signal generation circuit, a voltage detection circuit, a current detection circuit, and a resistance detection circuit. Under the control of the main control circuit, the signal generation circuit can output one of a sine wave signal, a square wave signal, or a triangular wave signal, and these signals can be used to simulate different working environments to test the performance of the object to be measured under different conditions. The current detection circuit, voltage detection circuit, and resistance detection circuit are respectively used to detect the current, voltage, and resistance of the object to be measured and output corresponding current detection signals, voltage detection signals, and resistance detection signals. The main control circuit processes and analyzes the received detection signals to obtain accurate values of the current, voltage, and resistance of the object to be measured. And the corresponding data can be displayed in real time through a display screen, enabling users to intuitively understand the state of the object to be measured, or can be transmitted to an external terminal, such as a host computer or a mobile phone, through a communication module, so that users can remotely monitor the state of the object to be measured and store the data through the host computer or the mobile phone.

[0030] With such a setting, in practical applications, the overhaul device of the present utility model can be applied to the overhaul of household appliances such as refrigerators, washing machines, air conditioners, and microwave ovens. After long-term use, household appliances may experience performance degradation or failures. Maintenance personnel only need to use the overhaul device of the present utility model to conveniently detect key parameters such as the voltage, current, and resistance of the equipment, help locate the fault point, and improve the maintenance efficiency. Maintenance personnel can also use the overhaul device of the present utility model to regularly detect sockets, switches, and circuits in the household circuit to ensure circuit safety and prevent safety accidents such as fires. Compared with existing household appliance maintenance equipment such as multimeters and signal generators, the present utility model integrates the functions of household appliance maintenance equipment such as multimeters and signal generators in the same device. For maintenance personnel, there is no need to carry multiple household appliance maintenance equipment during maintenance, and only the overhaul device of the present utility model needs to be carried for maintenance, which is both simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0032] Figure 1 It is a module schematic diagram of an embodiment of the present utility model;

[0033] Figure 2 Schematic diagram of the circuit structure according to another embodiment of the present utility model;

[0034] Figure 3 Schematic diagram of the circuit structure according to yet another embodiment of the present utility model;

[0035] Figure 4 Schematic diagram of the circuit structure according to still another embodiment of the present utility model;

[0036] Figure 5 Schematic diagram of the circuit structure according to another embodiment of the present utility model.

[0037] Description of the reference numerals in the drawings:

[0038] 10. Main control circuit; 20. Signal generation circuit; 21. Square wave generation circuit; 22. Triangular wave generation circuit; 23. Sine wave generation circuit; 24. Switch assembly; 30. Voltage detection circuit; 40. Current detection circuit; 50. Resistance detection circuit.

[0039] The realization of the purpose, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if the embodiments of the present utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] Home appliance repair equipment is essential tools and equipment for repairing various household appliances. There are many types of it. According to the specific repair items and requirements, common home appliance repair equipment mainly includes the following: electric soldering pens, multimeters, oscilloscopes, signal generators or spectrum analyzers, etc., which are used to deeply analyze and detect problems of home appliances. However, for repair personnel, a large number of the above-mentioned equipment need to be carried for home appliance repair, thus increasing the travel burden of the repair personnel and making the movement and handling of the equipment difficult.

[0044] Therefore, the present utility model proposes an inspection device, aiming to integrate multiple functions required for repair in the same device, so that the inspection device can meet the needs of different repair tasks, thereby solving the problems that repair personnel need to carry a large number of equipment when traveling, resulting in a heavy burden and difficult movement of the equipment.

[0045] Reference Figure 1 , in an embodiment of the present utility model, an inspection device includes:

[0046] A main control circuit 10;

[0047] A signal generation circuit 20, the signal generation circuit 20 is electrically connected to the control end of the main control circuit 10, and the main control circuit 10 is used to control the signal generation circuit 20 to output a sine wave signal, a square wave signal or a triangular wave signal;

[0048] A voltage detection circuit 30, the output end of the voltage detection circuit 30 is electrically connected to the detection end of the main control circuit 10, the detection end of the voltage detection circuit 30 is used to check the voltage of the object to be measured, and the voltage detection circuit 30 is used to detect the voltage and output a corresponding voltage detection signal;

[0049] Current detection circuit 40, the output terminal of the current detection circuit 40 is electrically connected to the detection terminal of the main control circuit 10, the detection terminal of the current detection circuit 40 is used to check the current of the object to be measured, and the current detection circuit 40 is used to detect the current and output a corresponding current detection signal;

[0050] Resistance detection circuit 50, the output terminal of the resistance detection circuit 50 is electrically connected to the detection terminal of the main control circuit 10, the detection terminal of the resistance detection circuit 50 is used to check the resistance of the object to be measured, and the resistance detection circuit 50 is used to detect the resistance value and output a corresponding resistance detection signal;

[0051] The main control circuit 10 is used to output corresponding voltage data, current data or resistance data according to the voltage detection signal, the current detection signal or the resistance detection signal;

[0052] Communication module, the communication module is electrically connected to the output terminal of the main control circuit 10, and the communication module is used to establish a communication connection with an external terminal.

[0053] In this embodiment, the resistance detection circuit 50 includes a current source and a voltage measurement circuit. When the resistance detection circuit 50 detects the resistance of the object to be measured, the current source applies a constant current to the object to be measured, and the voltage measurement circuit measures the voltage across the object to be measured. The main control circuit 10 analyzes the voltage of the voltage measurement circuit and the current of the current source according to Ohm's law to obtain the resistance of the object to be measured.

[0054] In this embodiment, the main control circuit 10 can be implemented by a main controller, such as an MCU (Microcontroller Unit, micro control unit), a DSP (Digital Signal Process, digital signal processing chip), an FPGA (Field Programmable Gate Array, programmable logic gate array chip), an SOC (System On Chip, system-level chip), etc.

[0055] In this embodiment, the communication module includes a wireless communication module. Among them, the wireless communication module can use a wireless communication chip, such as a 4G / 5G communication chip, a WIFI communication chip, a Bluetooth communication chip, a local area network communication chip, etc. The wireless communication chip can establish a communication connection with an external terminal through an antenna and a wireless communication network. For example, if the external terminal is a user's handheld terminal, the wireless communication chip establishes a wireless communication connection with the user's handheld terminal through a 4G / 5G network, and the user can operate the corresponding APP on the handheld terminal to enable the handheld terminal to output corresponding control signals to the wireless communication chip through the 4G / 5G network.

[0056] In this embodiment, specifically, the maintenance device of the present utility model includes a main control circuit 10, a signal generation circuit 20, a voltage detection circuit 30, a current detection circuit 40, and a resistance detection circuit 50. Under the control of the main control circuit 10, the signal generation circuit 20 can output one of a sine wave signal, a square wave signal, or a triangular wave signal. These signals can be used to simulate different working environments to test the performance of the object to be tested under different conditions. The current detection circuit 40, the voltage detection circuit 30, and the resistance detection circuit 50 are respectively used to detect the current, voltage, and resistance of the object to be tested, and output corresponding current detection signals, voltage detection signals, and resistance detection signals. The main control circuit 10 processes and analyzes the received detection signals to obtain accurate values of the current, voltage, and resistance of the object to be tested. And the corresponding data can be displayed in real time through a display screen, enabling the user to intuitively understand the state of the object to be tested. It can also be transmitted to an external terminal, such as a host computer or a mobile phone, through a communication module, so that the user can remotely monitor the state of the object to be tested and store the data through the host computer or the mobile phone.

[0057] With such a setting, in practical applications, the maintenance device of the present utility model can be applied to the maintenance of household appliances such as refrigerators, washing machines, air conditioners, and microwave ovens. After long-term use, household appliances may experience performance degradation or malfunctions. Maintenance personnel only need to use the maintenance device of the present utility model to conveniently detect key parameters such as the voltage, current, and resistance of the equipment, help locate the fault point, and improve the maintenance efficiency. Maintenance personnel can also use the maintenance device of the present utility model to regularly detect sockets, switches, and circuits in the household circuit to ensure circuit safety and prevent safety accidents such as fires. Compared with existing household appliance maintenance equipment such as multimeters and signal generators, the present utility model integrates the functions of household appliance maintenance equipment such as multimeters and signal generators in the same device. For maintenance personnel, there is no need to carry multiple household appliance maintenance equipment during maintenance. They only need to carry the maintenance device of the present utility model to perform maintenance, which is simple and convenient.

[0058] Reference Figure 2 , in an embodiment of the present utility model, the signal generation circuit 20 includes:

[0059] A sine wave generation circuit 23, a square wave generation circuit 21, a triangular wave generation circuit 22, and a plurality of switch components 24. The output ends of the sine wave generation circuit 23, the square wave generation circuit 21, and the triangular wave generation circuit 22 are respectively electrically connected to the input ends of the corresponding switch components 24. The controlled ends of the three switch components 24 are electrically connected to the control end of the main control circuit 10.

[0060] In this embodiment, the switch assembly 24 can be implemented by at least one switching tube, such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc., and / or by at least one switching device, such as a contactor, a circuit breaker, and a relay. A single-pole triple-throw switch can also be used, which is not limited here.

[0061] In this embodiment, the main control circuit 10 can control the on / off of the switch assembly 24 to control one of the sine wave generating circuit 23, the square wave generating circuit 21, or the triangular wave generating circuit 22 to output a corresponding signal to the object under test. With such a setting, in practical applications, the user can select to output a corresponding signal according to actual needs. For example, in audio devices such as home audio systems and headphones, the user can use the repair device of the present utility model to test their frequency response characteristics, distortion degree, etc., thereby helping the user comprehensively evaluate the performance of the audio device. For example, a sine wave signal can be used to test the low-frequency and high-frequency responses of an audio device, while a square wave or triangular wave signal can be used to test its dynamic range and transient response. In a smart home system, different devices may require different types of waveform signals for debugging and calibration. Through the repair device of the present utility model, the user can conveniently select and output the required waveform signal to meet the debugging needs of different devices.

[0062] Reference Figure 3 , in an embodiment of the present utility model, the square wave generating circuit 21 includes:

[0063] A first amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a first zener diode D1, and a second zener diode D2. The inverting terminal of the first amplifier U1 is electrically connected to the first end of the first resistor R1 and the first end of the first capacitor C1 respectively. The second end of the first capacitor C1 is grounded. The output terminal of the first amplifier U1 is electrically connected to the first end of the second resistor R2. The second end of the second resistor R2 is electrically connected to the second end of the first resistor R1. The non-inverting terminal of the first amplifier U1 is electrically connected to the first end of the third resistor R3 and the first end of the fourth resistor R4 respectively. The second end of the fourth resistor R4 is grounded. The second end of the third resistor R3 is electrically connected to the second end of the second resistor R2. The second end of the third resistor R3 is also electrically connected to the anode of the first zener diode D1. The cathode of the first zener diode D1 is electrically connected to the cathode of the second zener diode D2. The anode of the second zener diode D2 is grounded. The anode of the first zener diode D1 is electrically connected to the input terminal of the corresponding switch assembly 24.

[0064] In this embodiment, the first resistor R1 and the first capacitor C1 form an RC circuit, the third resistor R3, the fourth resistor R4 and the first amplifier U1 form a hysteresis comparator, and the hysteresis comparator and the RC circuit can form a square wave generating circuit 21. The square wave is output through the output terminal of the first amplifier U1. Among them, the first zener diode D1 and the second zener diode D2 play a role in limiting the amplitude, so that the amplitude of the square wave will not be too large.

[0065] In this embodiment, the triangular wave generating circuit 22 includes:

[0066] A second amplifier U2, a fifth resistor R5, a sixth resistor R6 and a second capacitor C2. The first end of the fifth resistor R5 is connected to the second end of the second resistor R2. The second end of the fifth resistor R5 is electrically connected to the inverting end of the second amplifier U2. The first end of the sixth resistor R6 is grounded. The second end of the sixth resistor R6 is electrically connected to the non-inverting end of the second amplifier U2. The inverting end of the second amplifier U2 is also electrically connected to the first end of the second capacitor C2. The second end of the second capacitor C2 is electrically connected to the output terminal of the second amplifier U2. The output terminal of the second amplifier is also electrically connected to the input terminal of the corresponding switch assembly.

[0067] In this embodiment, the inverting end of the second amplifier U2 is used to access the square wave signal output by the square wave generating circuit 21. The second amplifier U2, the fifth resistor R5, the sixth resistor R6 and the second capacitor C2 form an integrator. Based on the characteristic of the integrator to perform integral operation on the input signal, the high level and the low level of the square wave respectively generate the rising edge and the falling edge of the triangular wave under the action of the integrator, so as to form a complete triangular wave signal.

[0068] In this embodiment, the sine wave generating circuit 23 includes:

[0069] A third amplifier U3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a third capacitor C3. The first end of the seventh resistor R7 is connected to the output terminal of the second amplifier U2. The second end of the seventh resistor R7 is electrically connected to the inverting end of the third amplifier U3. The inverting end of the third amplifier U3 is also respectively electrically connected to the first end of the third capacitor C3 and the first end of the eighth resistor R8. The second end of the eighth resistor R8 and the second end of the third capacitor C3 are both electrically connected to the output terminal of the third amplifier U3. The output terminal of the third amplifier U3 is also electrically connected to the input terminal of the corresponding switch assembly 24. The non-inverting end of the third amplifier U3 is electrically connected to the first end of the ninth resistor R9. The second end of the ninth resistor R9 is grounded.

[0070] In this embodiment, the inverting input terminal of the third amplifier U3 is connected to the triangular wave signal output by the triangular wave generating circuit 22. The third amplifier U3, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor, and the third capacitor C3 form a low-pass filter. Through the processing of the low-pass filter, the high-frequency components in the triangular wave are filtered out, and only the low-frequency fundamental wave components are retained. Since the fundamental wave component itself is a sine wave, the triangular wave signal after being processed by the low-pass filter gradually approaches a sine wave.

[0071] With such a setting, the square wave generating circuit 21, the triangular wave generating circuit 22, and the sine wave generating circuit 23 can be integrated in the same circuit, realizing the integration of functions, reducing the complexity of circuit design, making the circuit more compact, reducing the occupied space, and at the same time reducing the cost. Compared with the prior art signal generator, the overhaul device of the present utility model is smaller in volume and convenient to carry, and can be applied to simple maintenance work.

[0072] Reference Figure 4 , in an embodiment of the present utility model, the voltage detection circuit 30 includes:

[0073] A voltage sensor, a filtering circuit, and an amplifier circuit. The voltage sensor is used to detect the voltage of the object to be measured and output a corresponding voltage detection signal. The output terminal of the voltage sensor is electrically connected to the input terminal of the filtering circuit. The output terminal of the filtering circuit is electrically connected to the input terminal of the amplifier circuit. The output terminal of the amplifier circuit is electrically connected to the detection terminal of the main control circuit 10.

[0074] In the present utility model, the voltage sensor can be any one of a resistor voltage divider, a voltage transformer, or a Hall voltage sensor.

[0075] In this embodiment, the voltage sensor can detect the voltage of the object to be measured and output a corresponding voltage detection signal. The main function of the filtering circuit is to remove the noise and interference in the voltage detection signal to ensure that the signals received by the subsequent amplifier circuit and the main control circuit 10 are clear and accurate. The amplifier circuit amplifies the filtered signal so that the main control circuit 10 can more easily detect the voltage change.

[0076] Reference Figure 5 , in an embodiment of the present utility model, the current detection circuit 40 includes:

[0077] A plurality of sampling resistors and a plurality of switching tubes. The first end of each sampling resistor is used to collect the current of the object to be measured. The second ends of the plurality of sampling resistors are respectively and electrically connected to the input terminals of the plurality of switching tubes. The controlled terminals of the plurality of switching tubes are all electrically connected to the control terminal of the main control circuit 10. The output terminals of the plurality of switching tubes are all electrically connected to the detection terminal of the main control circuit 10.

[0078] In this embodiment, the first ends of multiple sampling resistors are all connected to the same port, and this port is in contact with the object to be measured through a probe, so that the corresponding sampling resistor samples the current of the object to be measured. The resistance values of the multiple sampling resistors are arranged in an arithmetic progression in sequence. The main control circuit 10 can control any one of the switching tubes to conduct, so that the corresponding resistor is in contact with the object to be measured through the probe. The main control circuit 10 calculates the magnitude of the current of the object to be measured according to the voltage on the sampling resistor and in combination with the resistance value of the sampling resistor. With such a setting, the user can select a sampling resistor with a corresponding resistance value according to currents of different magnitudes, thereby ensuring the accuracy of the measurement.

[0079] In an embodiment of the present utility model, the maintenance device further includes:

[0080] A probe, a voltage dividing circuit, and a buzzer. The first end of the probe is used to collect the current of the object to be measured. The second end of the probe is electrically connected to the first end of the voltage dividing circuit. The second end of the voltage dividing circuit is electrically connected to the detection end of the main control circuit 10. The buzzer is electrically connected to the control end of the main control circuit 10.

[0081] In this embodiment, the voltage dividing circuit can be composed of a resistor with an extremely large resistance value. The probe is used to collect the voltage of the object to be measured by direct contact. Since the resistance value of the voltage dividing circuit is extremely large, the voltage received by the main control circuit 10 will be relatively small. Therefore, the probe is used to collect high current or high voltage. If the main control circuit 10 receives the voltage on the voltage dividing circuit, it indicates that there is a relatively large current in the object to be measured. The main control circuit 10 controls the buzzer to emit an alarm to prompt the user that there is a relatively large current in the object to be measured. With such a setting, in practical applications, when repairing or detecting household electrical appliances, the maintenance device of the present utility model can be used to check whether the internal circuit connection of the device is normal, whether there are short circuits, open circuits, or high-current areas. Especially when dealing with high-voltage or high-current electrical equipment rooms, such as transformers, motors, relays, etc., using this device can greatly improve safety and avoid electric shock accidents.

[0082] In an embodiment of the present utility model, the maintenance device further includes:

[0083] A capacitance detection circuit. The output end of the capacitance detection circuit is electrically connected to the detection end of the main control circuit 10. The detection end of the capacitance detection circuit is used to detect the capacitance value of the object to be measured and output a corresponding capacitance detection signal to the main control circuit 10.

[0084] In this embodiment, the capacitance detection circuit includes a current source and a voltage measurement circuit. The current source outputs a current through a probe to charge the capacitance to be measured. The voltage measurement circuit detects the voltage change of the capacitance to be measured through the probe. The main control circuit 10 can estimate its capacitance value according to the voltage and time parameters during the charging and discharging process of the capacitance to be measured.

[0085] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A maintenance device, characterized in that, Including: The main control circuit; A signal generation circuit, the signal generation circuit being electrically connected to the control terminal of the main control circuit, the main control circuit being configured to control the signal generation circuit to output a sine wave signal, a square wave signal or a triangular wave signal; A voltage detection circuit, the output terminal of the voltage detection circuit being electrically connected to the detection terminal of the main control circuit, the detection terminal of the voltage detection circuit being configured to detect the voltage of the object to be measured, the voltage detection circuit being configured to detect the voltage and output a corresponding voltage detection signal; A current detection circuit, the output terminal of the current detection circuit being electrically connected to the detection terminal of the main control circuit, the detection terminal of the current detection circuit being configured to detect the current of the object to be measured, the current detection circuit being configured to detect the current and output a corresponding current detection signal; A resistance detection circuit, the output terminal of the resistance detection circuit being electrically connected to the detection terminal of the main control circuit, the detection terminal of the resistance detection circuit being configured to detect the resistance of the object to be measured, the resistance detection circuit being configured to detect the resistance value and output a corresponding resistance detection signal; The main control circuit is configured to output corresponding voltage data, current data or resistance data according to the voltage detection signal, the current detection signal or the resistance detection signal; A communication module, the communication module being electrically connected to the output terminal of the main control circuit, the communication module being configured to establish a communication connection with an external terminal.

2. The maintenance device according to claim 1, characterized in that, The signal generation circuit includes: A sine wave generation circuit, a square wave generation circuit, a triangular wave generation circuit and a plurality of switch components, the output terminals of the sine wave generation circuit, the square wave generation circuit and the triangular wave generation circuit are respectively electrically connected to the input terminals of the corresponding switch components, and the controlled terminals of the three switch components are electrically connected to the control terminal of the main control circuit.

3. The inspection device according to claim 2, characterized in that The square wave generation circuit includes: A first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a first voltage stabilizing diode and a second voltage stabilizing diode, the inverting terminal of the first amplifier is respectively electrically connected to the first terminal of the first resistor and the first terminal of the first capacitor, the second terminal of the first capacitor is grounded, the output terminal of the first amplifier is electrically connected to the first terminal of the second resistor, the second terminal of the second resistor is electrically connected to the second terminal of the first resistor, the non-inverting terminal of the first amplifier is respectively electrically connected to the first terminal of the third resistor and the first terminal of the fourth resistor, the second terminal of the fourth resistor is grounded, the second terminal of the third resistor is electrically connected to the second terminal of the second resistor, the second terminal of the third resistor is further electrically connected to the anode of the first voltage stabilizing diode, the cathode of the first voltage stabilizing diode is electrically connected to the cathode of the second voltage stabilizing diode, the anode of the second voltage stabilizing diode is grounded, and the anode of the first voltage stabilizing diode is electrically connected to the input terminal of the corresponding switch component.

4. The inspection device according to claim 3, characterized in that, The triangular wave generation circuit includes: A second amplifier, a fifth resistor, a sixth resistor, and a second capacitor. The first end of the fifth resistor is connected to the second end of the second resistor. The second end of the fifth resistor is electrically connected to the inverting terminal of the second amplifier. The first end of the sixth resistor is grounded. The second end of the sixth resistor is electrically connected to the non-inverting terminal of the second amplifier. The inverting terminal of the second amplifier is further electrically connected to the first end of the second capacitor. The second end of the second capacitor is electrically connected to the output terminal of the second amplifier. The output terminal of the second amplifier is further electrically connected to the input terminal of the corresponding switch assembly.

5. The inspection device according to claim 4, characterized in that, The sine wave generating circuit includes: A third amplifier, a seventh resistor, an eighth resistor, a ninth resistor, and a third capacitor. The first end of the seventh resistor is electrically connected to the output terminal of the second amplifier. The second end of the seventh resistor is electrically connected to the inverting terminal of the third amplifier. The inverting terminal of the third amplifier is further respectively electrically connected to the first end of the third capacitor and the first end of the eighth resistor. The second end of the eighth resistor and the second end of the third capacitor are both electrically connected to the output terminal of the third amplifier. The output terminal of the third amplifier is further electrically connected to the input terminal of the corresponding switch assembly. The non-inverting terminal of the third amplifier is electrically connected to the first end of the ninth resistor. The second end of the ninth resistor is grounded.

6. The maintenance device according to claim 1, characterized in that The communication module includes a wireless communication module, and the wireless communication module is used to establish a wireless communication connection with a host computer.

7. The inspection device according to claim 1, characterized in that, The voltage detection circuit includes: A voltage sensor, a filtering circuit, and an amplifier circuit. The voltage sensor is used to detect the voltage of the object to be measured and output a corresponding voltage detection signal. The output terminal of the voltage sensor is electrically connected to the input terminal of the filtering circuit. The output terminal of the filtering circuit is electrically connected to the input terminal of the amplifier circuit. The output terminal of the amplifier circuit is electrically connected to the detection terminal of the main control circuit.

8. The maintenance device according to claim 1, characterized in that, The current detection circuit includes: A plurality of sampling resistors and a plurality of switching tubes. The first end of each sampling resistor is used to collect the current of the object to be measured. The second ends of the plurality of sampling resistors are electrically connected to the input terminals of the plurality of switching tubes in one-to-one correspondence. The controlled terminals of the plurality of switching tubes are all electrically connected to the control terminal of the main control circuit. The output terminals of the plurality of switching tubes are all electrically connected to the detection terminal of the main control circuit.

9. The maintenance device according to any one of claims 1 to 8, characterized in that, The maintenance device further includes: A probe, a voltage dividing circuit, and a buzzer. The first end of the probe is used to collect the current of the object to be measured. The second end of the probe is electrically connected to the first end of the voltage dividing circuit. The second end of the voltage dividing circuit is electrically connected to the detection terminal of the main control circuit. The buzzer is electrically connected to the control terminal of the main control circuit.

10. The maintenance device according to any one of claims 1 to 8, characterized in that, The maintenance device further includes: A capacitance detection circuit. The output terminal of the capacitance detection circuit is electrically connected to the detection terminal of the main control circuit. The detection terminal of the capacitance detection circuit is used to detect the capacitance value of the object to be measured and output a corresponding capacitance detection signal to the main control circuit.

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