Voice broadcast test pencil circuit capable of testing real voltage

Abstract

The utility model discloses a voice broadcast test pencil circuit capable of testing real voltage, and the circuit comprises an MCU central control module which is used for the control and data processing of the whole circuit; the BAT power supply module is used for being responsible for power supply management and providing stable power supply output; the ADC / NCV electricity measurement module is used for voltage measurement; the KEY key module is used for being responsible for interaction between an operator and the whole circuit; and the VOICE voice broadcast module comprises a voice control chip and a loudspeaker and is used for performing voice broadcast on a result measured by the ADC / NCV electricity measurement module. The voltage measured by the ADC / NCV electricity measuring module can be subjected to voice broadcast through a loudspeaker of the VOICE voice broadcast module, and compared with the prior art, measurement results can be read without eye observation, convenience is brought to operators, and meanwhile the device is suitable for different test scenes. Besides, the test pencil further has a contact type electricity testing mode, a non-contact type electricity testing mode and a conduction electricity testing mode, each mode can broadcast a test result through voice, different test requirements can be met, and the test accuracy and reliability are improved.

Description

Technical Field

[0001] This application belongs to the field of voltage tester technology, specifically, it relates to a voice-announced voltage tester circuit capable of testing real voltage. Background Technology

[0002] Traditional contact voltage testers display simulated fixed voltage values, not actual measured values, leading to inaccurate voltage measurements. To measure the true voltage, patent CN218099348U discloses a tester capable of producing accurate readings. However, the measured voltage can only be read manually by observing the LCD screen, which presents difficulties for visual reading in certain scenarios. Utility Model Content

[0003] The purpose of this invention is to provide a voice-announced voltage tester circuit that can test real voltage, and the measured voltage can be read out by voice announcement.

[0004] The technical solution adopted in this application is as follows:

[0005] This utility model provides a voice-announced voltage tester circuit capable of testing real voltage, comprising:

[0006] The MCU central control module is responsible for the control and data processing of the entire circuit.

[0007] BAT power modules are responsible for power management and provide stable power output;

[0008] The ADC / NCV voltage measurement module is used for voltage measurement.

[0009] The KEY button module is used to handle the interaction between the operator and the entire circuit.

[0010] The VOICE voice broadcast module, which includes a voice control chip and a speaker, is responsible for broadcasting the results measured by the ADC / NCV electrical measurement module.

[0011] Furthermore, the voice control chip includes a pulse width modulation pin for controlling voice output, and the speaker is electrically connected to the pulse width modulation pin.

[0012] Furthermore, the MCU central control module uses the SFM8P6667 chip.

[0013] Furthermore, the ADC / NCV electrical measurement module includes both contact electrical measurement mode and non-contact electrical measurement mode;

[0014] The KEY button module includes a power button and a VOL conductive button;

[0015] After powering on, the default mode is non-contact electrical measurement.

[0016] Press or release the VOL conductive button to enter the contact-type electrical measurement mode.

[0017] Furthermore, the ADC / NCV electrical measurement module also includes a conduction measurement mode;

[0018] The KEY button module also includes a CON conductive button;

[0019] Pressing the CON conductive button alone can measure the continuity of the circuit, which can be used to determine whether there is a break in the circuit.

[0020] Furthermore, it also includes an LCD liquid crystal display module for displaying the results measured by the DC / NCV electrical measurement module.

[0021] Furthermore, it also includes an LED flashlight module for providing illumination.

[0022] Furthermore, it also includes a BL backlight module, which is responsible for light prompts.

[0023] Furthermore, the ADC / NCV electrical measurement module includes a U4 chip, which includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin;

[0024] NVC1 is connected to the fourth pin through a series connection of a first resistor, a second resistor, a third resistor, and a fourth resistor, and is also connected to the ADC through a fifth resistor.

[0025] The sixth and seventh resistors are connected in series to the first pin;

[0026] The twenty-seventh and twenty-eighth resistors are connected in series and then connected to the third pin;

[0027] The first capacitor is connected between the fifth resistor and ground;

[0028] Pin 5 is connected to the power supply VCC, pin 2 is grounded, and pin 6 is connected to the ADC.

[0029] Furthermore, it also includes the DOWNLOAD module, which is responsible for writing the program.

[0030] The beneficial effects of this utility model are:

[0031] This invention provides a voice-announcement voltage tester circuit capable of testing real voltages. The voltage measured by the ADC / NCV voltage measurement module is announced via voice through the speaker of the VOICE voice announcement module. Compared to existing technologies, this eliminates the need for visual observation to read measurement results, simplifying operation and making it suitable for various testing scenarios. Furthermore, the tester features contact, non-contact, and continuity testing modes, each with voice-announcement of test results, meeting diverse testing needs and improving accuracy and reliability. Attached Figure Description

[0032] In the attached diagram:

[0033] Figure 1 This is a schematic diagram of the system structure of an embodiment of the present utility model;

[0034] Figure 2 This is a circuit diagram of the MCU central control module according to an embodiment of the present invention;

[0035] Figure 3 This is a circuit diagram of the BAT power module according to an embodiment of the present invention;

[0036] Figure 4 This is a circuit diagram of the ADC / NCV electrical measurement module according to an embodiment of the present invention;

[0037] Figure 5 This is a circuit diagram of the KEY button module according to an embodiment of the present invention;

[0038] Figure 6 This is a circuit diagram of the VOICE voice broadcast module according to an embodiment of the present invention;

[0039] Figure 7 This is a circuit diagram of the LCD liquid crystal display module according to an embodiment of the present invention;

[0040] Figure 8 This is a circuit diagram of the LED flashlight module according to an embodiment of the present invention;

[0041] Figure 9 This is a circuit diagram of the BL backlight module according to an embodiment of the present invention;

[0042] Figure 10 The circuit diagram of the DOWNLOAD module in this embodiment of the present invention is shown. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments. Generally, the components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0044] like Figure 1 As shown in the embodiment of this utility model, the test pen circuit includes an MCU central control module, a BAT power supply module, an ADC / NCV voltage measurement module, a KEY button module, a VOICE voice broadcast module, an LCD liquid crystal display module, an LED flashlight module, a BL backlight module, and a DOWNLOAD module. Each module, through reasonable circuit design and connection, realizes the basic functions of the test pen.

[0045] like Figure 2 As shown, Figure 2 This is the circuit diagram of the MCU central control module. The MCU central control module uses the SFM8P6667 chip, which is an 8-bit microcontroller with a 20-bit ADC, single power supply, 5 interrupt sources, and a programmable gain amplifier. It is responsible for the control and data processing of the entire circuit. The chip's pins are connected to other modules through circuitry to realize signal transmission and control.

[0046] like Figure 3 As shown, Figure 3 This is the circuit diagram for the BAT power module. The BAT power module is powered by a 3.0V battery and provides a stable power output through the power management chip U3. The power module provides power support for the entire circuit.

[0047] like Figure 4 As shown, Figure 4 This is a circuit diagram of an ADC / NCV voltage measurement module. The ADC / NCV voltage measurement module includes a U4 chip, which has pins 1, 2, 3, 4, 5, and 6. NVC1 is connected to pin 4 via resistors 1, 2, 3, and 4 in series, and simultaneously connected to the ADC via resistor 5. Resistors 6 and 7 are connected to pin 1 in series. Resistors 27 and 28 are connected to pin 3 in series. A capacitor 1 is connected between resistor 5 and ground. Pin 5 is connected to the power supply VCC, pin 2 is grounded, and pin 6 is connected to the ADC. The pins of the U4 chip are connected to the probe of the voltage tester and ground via resistors and capacitors to achieve voltage measurement and signal processing.

[0048] like Figure 5 As shown, Figure 5 This is the circuit diagram for the KEY button module. The KEY button module includes a power button KEY1, a VOL conductive button KEY2, and a CON conductive button KEY3. The buttons are connected to the MCU pins via resistors to enable user input and interaction.

[0049] like Figure 6 As shown, Figure 6 This is a circuit diagram of the VOICE voice broadcast module, which includes a voice control chip U1 and a speaker BZ1. The pins of the voice control chip are connected to the speaker to implement the voice broadcast function.

[0050] like Figure 7 As shown, Figure 7 This is a circuit diagram of an LCD liquid crystal display module. The LCD liquid crystal display module displays measurement results through components such as the LCD driver chip U2.

[0051] like Figure 8 The above, Figure 8 This is a circuit diagram of an LED flashlight module. The pins of the MCU central control module are connected to the LED flashlight module. By outputting high and low levels, the module controls the transistor Q3 and related resistors and other components to realize the flashlight function.

[0052] like Figure 9 As shown, Figure 9 This is the circuit diagram for the BL backlight module. The pins of the MCU central control module are connected to the BL backlight module. By outputting high and low levels, the module controls transistors Q1 and Q2 and related resistors to achieve the backlight function.

[0053] like Figure 10 As shown, Figure 10 This is the circuit diagram for the DOWNLOAD module, which is responsible for writing programs, specifically for downloading program code or firmware from external devices (such as computers) to the micro MCU central control module in the circuit.

[0054] The embodiment of this utility model provides a voice broadcast voltage tester circuit that can test real voltage, including three test modes: non-contact voltage test mode, contact voltage test mode, and continuity voltage test mode.

[0055] Contact-based electrical measurement mode:

[0056] In contact-type voltage measurement mode, the test pen directly contacts the circuit under test through its probe to measure its voltage value. The specific steps are as follows:

[0057] To start the test pen: Press the power button KEY1 to start the MCU central control module and initialize all modules. Pressing and holding the power button KEY1 will activate the flashlight function.

[0058] Select contact-type electrical measurement mode: Press the VOL conductivity button KEY2. After the MCU receives the signal, it switches to contact-type electrical measurement mode.

[0059] Voltage measurement: The probe of the test pen is brought into contact with the circuit under test. The ADC / NCV voltage measurement module measures the voltage value through the U4 chip and related components. The measured voltage value is the true voltage. How to measure the true voltage has been disclosed in patent CN218099348U, and will not be repeated here.

[0060] Data processing: After receiving the measurement data, the MCU central control module performs data processing and analysis.

[0061] The results show that the measurement results are displayed on the screen via the LCD liquid crystal display module, and simultaneously broadcast via the speaker BZ1 of the VOICE voice broadcast module.

[0062] End measurement: Press the VOL conductivity button KEY2 again to exit the contact measurement mode.

[0063] In this mode, it can measure voltages up to 500V and can be used to measure neutral wire voltage, leakage voltage, and live wire voltage. Non-contact voltage measurement mode:

[0064] In non-contact voltage testing mode, the test pen moves its probe close to the circuit being tested to detect its voltage value. The specific steps are as follows:

[0065] Start the test pen: Press the power button KEY1 to start the MCU central control module and initialize all modules.

[0066] Default non-contact electrical testing mode: After powering on, the device defaults to non-contact electrical testing mode.

[0067] Voltage Measurement: The test pen probe is brought close to the circuit under test. The ADC / NCV voltage measurement module detects the voltage value through the U4 chip and related resistors and other components. It should be noted that the voltage value measured in non-contact voltage measurement mode is not the actual value, but only an indication. When the test pen probe is close to the circuit under test, the analog switch selects an appropriate resistor for voltage division via the high / low level control of the MCU central control module's I / O port. This voltage is then amplified differentially by the ADC through the MCU central control module's I / O port. The presence of voltage in the circuit can be determined when the probe is close to it.

[0068] Data processing: After receiving the measurement data, the MCU central control module performs data processing and analysis.

[0069] The results show that the measurement results are displayed on the screen via the LCD liquid crystal display module, and simultaneously broadcast via the speaker BZ1 of the VOICE voice broadcast module.

[0070] End measurement: Press the power button KEY1 to turn off the test pen.

[0071] Continuity measurement mode:

[0072] In continuity testing mode, the test pen determines whether there is a break in the circuit by measuring the continuity of the circuit. The specific steps are as follows:

[0073] Start the test pen: Press the power button KEY1 to start the MCU central control module and initialize all modules.

[0074] Select continuity test mode: Press the CON conduction button KEY3 alone. After the MCU receives the signal, it will switch to continuity test mode.

[0075] Continuity measurement: The probe of the test pen is brought into contact with the circuit under test. The ADC / NCV current measurement module measures the continuity of the circuit through the U4 chip and related components such as resistors. Specifically, the voltage drop value of the object is obtained through analog-to-digital conversion, and the resistance of the circuit under test is obtained through the voltage drop ratio of the resistors. If the resistance of the measured circuit is low, it is determined to be conductive. The resistance of continuity can be as low as 20MΩ.

[0076] Data processing: After receiving the measurement data, the MCU central control module performs data processing and analysis.

[0077] The results show that the measurement results are displayed on the screen via the LCD liquid crystal display module, and simultaneously broadcast via the speaker BZ1 of the VOICE voice broadcast module.

[0078] End measurement: Press the CON conductivity button KEY3 again to exit the continuity measurement mode.

[0079] In this mode, this function can also be used to determine the positive and negative terminals of the battery.

[0080] Voice broadcast function:

[0081] In all testing modes of the voltage tester, the VOICE voice broadcast module broadcasts the results via speaker BZ1, allowing operators to easily obtain measurement results in different scenarios. The specific steps are as follows:

[0082] Start the test pen: Press the power button KEY1 to start the MCU central control module and initialize all modules.

[0083] Select the measurement mode: Select the contact measurement mode, non-contact measurement mode, or continuity measurement mode as needed.

[0084] Measure voltage or continuity: Perform the corresponding measurement operations.

[0085] Data processing: After receiving the measurement data, the MCU central control module performs data processing and analysis.

[0086] Voice broadcast: The MCU central control module transmits data to the voice control chip U1. The voice control chip controls the speaker BZ1 through the PWM pin to broadcast the measurement results. The voice broadcast can support multiple languages.

[0087] End measurement: End the measurement as needed and turn off the test pen.

[0088] This invention provides a voice-announcement voltage tester circuit capable of testing real voltage. The voltage measured by the ADC / NCV voltage measurement module is announced via voice through the speaker of the VOICE voice announcement module. Compared to existing technologies, this eliminates the need for visual observation, making the measurement results more convenient for operators and applicable to various testing scenarios. Furthermore, the tester features contact, non-contact, and continuity testing modes to meet diverse testing needs and improve accuracy and reliability. Moreover, the voltage tester circuit provided in this embodiment can still distinguish between live and neutral wires even without power. When a live wire is detected, a high-voltage symbol will appear on the LCD display.

[0089] The embodiments described above are merely preferred embodiments of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the concept of this application, and these all fall within the protection scope of this application.

Claims

1. A voice broadcast test pen circuit capable of testing true voltage, characterized in that, It comprises: MCU central control module, for responsible for the control and data processing of the whole circuit; BAT power module, for responsible for power management, providing stable power output; ADC / NCV power measurement module, for responsible for voltage measurement; KEY button module, for responsible for the interaction between the operator and the whole circuit; VOICE voice broadcast module, including voice control chip and speaker, for responsible for voice broadcast of the results measured by the ADC / NCV power measurement module.

2. The voice announcement test voltage pen circuit capable of testing real voltage according to claim 1, characterized in that, The voice control chip includes a pulse width modulation pin for controlling voice output, and the speaker is electrically connected to the pulse width modulation pin.

3. The voice announcement test voltage pen circuit capable of testing real voltage according to claim 1, characterized in that, The MCU central control module adopts SFM8P6667 chip.

4. The voice announcement test voltage pen circuit capable of testing real voltage according to claim 1, characterized in that, The ADC / NCV power measurement module includes contact power measurement mode and non-contact power measurement mode; The KEY button module includes power-on button and VOL conductive button; After starting, the default is non-contact power measurement mode; Press or release the VOL conductive button to enter the contact power measurement mode.

5. The voice annunciation test voltage pen circuit capable of testing true voltage according to claim 4, characterized in that, The ADC / NCV power measurement module also includes a conductive power measurement mode; The KEY button module also includes a CON conductive button; Pressing the CON conductive button alone can measure the line conduction condition to determine whether the line is broken.

6. The voice annunciation test voltage pen circuit capable of testing true voltage according to claim 1, characterized in that, It also includes an LCD liquid crystal display module for displaying the results measured by the DC / NCV power measurement module.

7. The voice announcement test voltage pen circuit capable of testing real voltage according to claim 1, characterized in that, It also includes an LED flashlight module for responsible for lighting.

8. The voice announcement test voltage pen circuit capable of testing real voltage according to claim 1, characterized in that, It also includes a BL backlight module for responsible for light prompt.

9. The voice announcement test voltage pen circuit capable of testing real voltage according to claim 1, characterized in that, The ADC / NCV power measurement module includes U4 chip, which includes first pin, second pin, third pin, fourth pin, fifth pin and sixth pin; NVC1 is connected to the fourth pin through the series connection of the first resistor, the second resistor, the third resistor and the fourth resistor, and is connected to ADC through the fifth resistor; The sixth resistor and the seventh resistor are connected in series to the first pin; The twenty-seventh resistor and the twenty-eighth resistor are connected in series to the third pin; The first capacitor is connected between the fifth resistor and the ground; The fifth pin is connected to the power supply VCC, the second pin is grounded, and the sixth pin is connected to ADC.

10. The voice annunciation test voltage pen circuit capable of testing true voltage according to claim 1, characterized in that, It also includes a DOWNLOAD module for writing programs.

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