An overvoltage self-turn-off test circuit and tester
By introducing an overvoltage self-shutdown test circuit into the circuit tester, the input power parameters are monitored and the device is protected in case of overvoltage or overcurrent, which solves the problem of inconvenient use during charging and realizes safe and stable power detection and charging.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENYANG FIRE RES INST OF MEM
- Filing Date
- 2025-07-16
- Publication Date
- 2026-06-05
AI Technical Summary
Existing circuit testers are not convenient to use during charging and pose a risk of device damage.
Design an overvoltage self-shutdown test circuit. The circuit monitors the input power parameters through an electrical detection module and controls the discharge module to turn on when the voltage or current is too high, thus protecting the energy storage module and the control module. At the same time, it uses the input power to charge the energy storage module.
This technology enables charging to be performed simultaneously with power detection, ensuring operational safety and stability and reducing the likelihood of device damage.
Smart Images
Figure CN224328216U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit testing equipment technology, and in particular to an overvoltage self-shutdown test circuit and tester. Background Technology
[0002] The circuit tester has an electrical testing module. It can be connected to AC or DC power sources and can detect electrical parameters such as input voltage, current, power, and frequency. These parameters are analyzed and processed by the control module within the circuit tester. Previously, circuit testers also included an energy storage module to power both the control and electrical testing modules. When the energy storage module's power is depleted, it needs to be replaced or recharged. The circuit tester has a charging plug connected to the energy storage module, and a charging cable is used to connect to both an external power source and the charging plug, allowing the external power source to charge the module. However, this method is relatively cumbersome, as users cannot easily use the tester to test the input power during the charging process. Utility Model Content
[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an overvoltage self-shutdown test circuit and tester that can charge the device while detecting the power supply, and ensure safe and stable operation, reducing the probability of device damage.
[0004] An overvoltage self-shutdown test circuit according to a first aspect embodiment of the present invention includes: an electrical detection module, the sampling terminal of which is connected to an input power supply to detect electrical parameters of the input power supply, wherein the electrical parameters include at least one of voltage and current of the input power supply; a control module connected to the electrical detection module; an input module, the input terminal of which is connected to the input power supply; an energy storage module connected to the control module and the electrical detection module to supply power to the control module and the electrical detection module; a charging module, the input terminal of which is connected to the output terminal of the input module, and the output terminal of which is connected to the energy storage module; and a discharge module, the input terminal of which is connected to the output terminal of the input module, and the output terminal of which is grounded, wherein the control module controls the on / off state of the discharge module according to the magnitude of the voltage or current of the input power supply.
[0005] An overvoltage self-shutdown test circuit according to an embodiment of the present invention has at least the following beneficial effects:
[0006] This utility model's overvoltage self-shutdown test circuit connects the sampling terminal of the electrical detection module and the input terminal of the input module to the input power supply during electrical testing. For a period of time, the electrical detection module monitors the electrical parameters of the input power supply, such as voltage, current, and power. Simultaneously, it uses the electrical energy output from the input power supply to charge the energy storage module via the charging module. When excessive voltage or current is detected, the circuit promptly controls the discharge module to conduct, protecting the electrical detection module and energy storage module from impact. This design enables charging while simultaneously testing the power supply, ensuring safe and stable operation and reducing the likelihood of device damage.
[0007] According to some embodiments of the present invention, the discharge module includes a switching unit and an isolation unit. The input terminal of the switching unit is connected to the output terminal of the input module, and the output terminal of the switching unit is grounded. The control module is connected to the input terminal of the isolation unit, and the output terminal of the isolation unit is connected to the controlled terminal of the switching unit. The isolation unit allows signals to be transmitted from the input terminal to the output terminal while restricting signals from being transmitted from the output terminal to the input terminal.
[0008] According to some embodiments of this utility model, the isolation unit includes an optocoupler oct2, a Zener diode Z1, and a capacitor C1. The input terminal of the light emitter of the optocoupler oct2 is connected to the control module, the output terminal of the light emitter of the optocoupler oct2 is grounded, the input terminal of the light receiver of the optocoupler oct2 is connected to the negative terminal of the Zener diode Z1, the first terminal of the capacitor C1, and the power supply, respectively, the output terminal of the light receiver of the optocoupler oct2 is connected to the controlled terminal of the switching unit, and the positive terminal of the Zener diode Z1 and the tail terminal of the capacitor C1 are both grounded.
[0009] According to some embodiments of the present invention, the switching unit includes a semiconductor switching transistor Q1, the input terminal of the switching transistor Q1 is connected to the output terminal of the input module, the output terminal of the switching transistor Q1 is grounded, and the output terminal of the isolation unit is connected to the controlled terminal of the switching transistor Q1.
[0010] According to some embodiments of the present invention, the charging module includes a semiconductor switching transistor Q3 and a semiconductor switching transistor Q4. The input terminal of the switching transistor Q3 is connected to the output terminal of the input module, the output terminal of the switching transistor Q3 is connected to the energy storage module, the input terminal of the switching transistor Q4 is connected to the controlled terminal of the switching transistor Q3, the output terminal of the switching transistor Q4 is grounded, and the control module is connected to the controlled terminal of the switching transistor Q4.
[0011] According to some embodiments of the present invention, the overvoltage self-shutdown test circuit further includes a discharge module, the input terminal of which is connected to the energy storage module, and the output terminal of which is connected to the control module and the electrical detection module.
[0012] According to some embodiments of the present invention, the control module is provided with a timing unit, which is used to provide timing signals.
[0013] According to some embodiments of the present invention, the input module includes a fuse F1 and a rectifier bridge unit. The input terminal of the rectifier bridge unit is connected to the input power supply through the fuse F1, and the output terminal of the rectifier bridge unit is connected to the input terminal of the charging module and the input terminal of the discharge module, respectively.
[0014] The tester according to the second aspect of the present invention includes an overvoltage self-shutdown test circuit disclosed in any of the above embodiments.
[0015] The testing instrument according to the embodiments of this utility model has at least the following beneficial effects:
[0016] This utility model tester uses an overvoltage self-shutdown test circuit disclosed in any of the above embodiments. It can charge the power supply while detecting it, and ensure safe and stable operation, reducing the probability of device damage.
[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0019] Figure 1 This is a schematic block diagram of one embodiment of the overvoltage self-shutdown test circuit of this utility model;
[0020] Figure 2 This is a circuit diagram of the control module of one embodiment of the overvoltage self-shutdown test circuit of this utility model;
[0021] Figure 3 This is a circuit diagram of the input module and the discharge module of one embodiment of the overvoltage self-shutdown test circuit of this utility model;
[0022] Figure 4 This is a circuit diagram of the charging module, energy storage module, and discharging module of one embodiment of the overvoltage self-shutdown test circuit of this utility model.
[0023] Figure 5 This is a circuit diagram of the electrical detection module of one embodiment of the overvoltage self-shutdown test circuit of this utility model.
[0024] Figure label:
[0025] Electrical detection module 100; control module 200; timing unit 210; input module 300; rectifier bridge unit 310; charging module 400; energy storage module 500; discharge module 600; bleeder module 700; switching unit 710; isolation unit 720. Detailed Implementation
[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0027] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] like Figures 1 to 5As shown, an overvoltage self-shutdown test circuit according to a first aspect embodiment of the present invention includes an electrical detection module 100, a control module 200, an input module 300, a charging module 400, an energy storage module 500, and a discharge module 700. The sampling terminal of the electrical detection module 100 is connected to an input power supply to detect the electrical parameters of the input power supply, wherein the electrical parameters include at least one of the voltage and current of the input power supply. The control module 200 is connected to the electrical detection module 100, and the input terminal of the input module 300 is connected to the input power supply for energy storage. Module 500 is connected to the control module 200 and the electrical detection module 100 to supply power to the control module 200 and the electrical detection module 100. The input terminal of the charging module 400 is connected to the output terminal of the input module 300, and the output terminal of the charging module 400 is connected to the energy storage module 500. The input terminal of the discharge module 700 is connected to the output terminal of the input module 300, and the output terminal of the discharge module 700 is grounded. The control module 200 controls the on / off state of the discharge module 700 according to the voltage or current of the input power supply.
[0031] The control module 200 may include an MCU or CPU and its associated circuitry. The energy storage module 500 may be selected from conventional batteries or supercapacitors. The overvoltage self-shutdown test circuit may also include a display module, which may be a digital tube display, an LCD display, etc. In some embodiments of this invention, the electrical detection module 100 includes one or more of a voltage detection unit, a zero-crossing detection unit, and a current detection unit. The voltage detection unit, zero-crossing detection unit, and current detection unit may be conventionally composed of discrete components. For example, they may include sampling resistors, voltage divider resistors, etc., to constitute the voltage detection unit and the current detection unit. They may include optocouplers to constitute the zero-crossing detection unit. Specifically, for example... Figure 5 As shown, the voltage detection unit, zero-crossing detection unit, and current detection unit can also be directly integrated detection chips.
[0032] In some embodiments of this utility model, the overvoltage self-shutdown test circuit further includes a first connector and a second connector. The sampling terminal of the electrical detection module 100 is connected to the first connector and the second connector respectively. Similarly, the input terminal of the input module 300 is connected to the first connector and the second connector respectively. Both the first connector and the second connector can be connected with wires to facilitate the user's connection of the input power supply.
[0033] In some embodiments of this utility model, such as Figure 3As shown, the input module 300 includes a fuse F1 and a rectifier bridge unit 310. The input terminal of the rectifier bridge unit 310 is connected to the input power supply through the fuse F1, and the output terminal of the rectifier bridge unit 310 is connected to the input terminal of the charging module 400 and the input terminal of the discharge module 700, respectively.
[0034] This utility model's overvoltage self-shutdown test circuit, when performing electrical testing on the input power supply, connects both the sampling terminal of the electrical detection module 100 and the input terminal of the input module 300 to the input power supply. For a period of time, the electrical detection module 100 monitors the electrical parameters of the input power supply, such as voltage, current, and power. Simultaneously, the electrical energy output from the input power supply can be used to charge the energy storage module 500 through the charging module 400. When excessive voltage or current is detected, the discharge module 700 is promptly turned on to protect the electrical detection module 100 and the energy storage module 500 from impact. This design allows for charging while simultaneously testing the power supply, ensuring safe and stable operation and reducing the probability of device damage.
[0035] In some embodiments of this utility model, such as Figure 3 As shown, the discharge module 700 includes a switching unit 710 and an isolation unit 720. The input terminal of the switching unit 710 is connected to the output terminal of the input module 300, and the output terminal of the switching unit 710 is grounded. The control module 200 is connected to the input terminal of the isolation unit 720, and the output terminal of the isolation unit 720 is connected to the controlled terminal of the switching unit 710. The isolation unit 720 allows signals to be transmitted from the input terminal to the output terminal while restricting signals from being transmitted from the output terminal to the input terminal.
[0036] When the voltage or current of the input power supply is too high, the control module 200 can output a control command to control the switch unit 710 to conduct. The signal connected to the input power supply side cannot flow into the control module 200 from the isolation unit 720, so as to prevent the control module 200 from being damaged or disordered due to signal interference or impact.
[0037] In some embodiments of this utility model, such as Figure 3 As shown, the isolation unit 720 includes an optocoupler oct2, a Zener diode Z1, and a capacitor C1. The input terminal of the emitter of the optocoupler oct2 is connected to the control module 200, and the output terminal of the emitter of the optocoupler oct2 is grounded. The input terminal of the receiver of the optocoupler oct2 is connected to the negative terminal of the Zener diode Z1, the first terminal of the capacitor C1, and the power supply, respectively. The output terminal of the receiver of the optocoupler oct2 is connected to the controlled terminal of the switching unit 710. The positive terminal of the Zener diode Z1 and the tail terminal of the capacitor C1 are both grounded.
[0038] Zener diode Z1 and capacitor C1 provide a stable power supply for the photodetector of optocoupler oct2. When the control module 200 outputs a high-level control signal to the input terminal of the photodetector of optocoupler oct2, the photodetector of optocoupler oct2 lights up, the photodetector of optocoupler oct2 is turned on, and the controlled terminal of switching unit 710 is energized, causing switching unit 710 to turn on.
[0039] Specifically, the switching unit 710 includes a semiconductor switching transistor Q1. The input terminal of the switching transistor Q1 is connected to the output terminal of the input module 300, and the output terminal of the switching transistor Q1 is grounded. The output terminal of the isolation unit 720 is connected to the controlled terminal of the switching transistor Q1. The switching transistor Q1 can be an N-type transistor, an N-channel MOSFET, a thyristor, etc.
[0040] In some embodiments of this utility model, such as Figure 4 As shown, the charging module 400 includes a semiconductor switching transistor Q3 and a semiconductor switching transistor Q4. The input terminal of the switching transistor Q3 is connected to the output terminal of the input module 300, the output terminal of the switching transistor Q3 is connected to the energy storage module 500, the input terminal of the switching transistor Q4 is connected to the controlled terminal of the switching transistor Q3, the output terminal of the switching transistor Q4 is grounded, and the control module 200 is connected to the controlled terminal of the switching transistor Q4.
[0041] The control module 200 can output a PWM signal to the switching transistor Q4, and adjust the turn-on threshold of the switching transistor Q3 by driving the switching transistor Q4, thereby adjusting the magnitude of the charging current.
[0042] In some embodiments of this utility model, such as Figure 4 As shown, the overvoltage self-shutdown test circuit also includes a discharge module 600. The input terminal of the discharge module 600 is connected to the energy storage module 500, and the output terminal of the discharge module 600 is connected to the control module 200 and the electrical detection module 100.
[0043] The discharge module 600 can modulate the electrical energy output by the energy storage module 500 to form a suitable voltage and current to power the control module 200 and the electrical detection module 100.
[0044] Specifically, the discharge module 600 may include a step-down chip and its associated circuitry. The step-down chip can modulate the voltage output by the energy storage module 500 to a voltage level suitable for powering the control module 200 and the electrical detection module 100, such as 3.3V or 5V.
[0045] In some embodiments of this utility model, the control module 200 is provided with a timing unit 210, which is used to provide timing signals.
[0046] When an overvoltage or overcurrent occurs, after the user troubleshoots and reconnects the first and second connectors to the input power supply, the timing unit 210 provides a timing signal, and the discharge module 700 remains disconnected. However, the control module 200 controls the charging module 400 to remain disconnected based on a delay in the timing signal. During the input power supply detection by the electrical detection module 100, if the voltage and current output by the input power supply are normal, and the time represented by the timing signal reaches the safe time threshold, the control module 200 will control the charging module 400 to conduct, and the input power supply will charge the energy storage module 500. Specifically, the timing unit 210 can be a crystal oscillator circuit, and the safe time threshold can be 10 seconds, 15 seconds, etc., which are set by the designer.
[0047] The tester according to a second aspect of the present invention includes an overvoltage self-shutdown test circuit disclosed in any of the above embodiments.
[0048] This utility model tester uses an overvoltage self-shutdown test circuit disclosed in any of the above embodiments. It can charge the power supply while detecting it, and ensure safe and stable operation, reducing the probability of device damage.
[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. An overvoltage self-shutdown test circuit, characterized in that, include: An electrical detection module, wherein the sampling terminal of the electrical detection module is used to connect to an input power supply to detect the electrical parameters of the input power supply, wherein the electrical parameters include at least one of the voltage and current of the input power supply; The control module is connected to the electrical detection module; An input module, wherein the input terminal of the input module is used to connect to an input power supply; An energy storage module is connected to the control module and the electrical detection module to supply power to the control module and the electrical detection module; A charging module, wherein the input terminal of the charging module is connected to the output terminal of the input module, and the output terminal of the charging module is connected to the energy storage module; A discharge module is provided, wherein the input terminal of the discharge module is connected to the output terminal of the input module, the output terminal of the discharge module is grounded, and the control module controls the on / off state of the discharge module according to the voltage or current of the input power supply.
2. The overvoltage self-shutdown test circuit according to claim 1, characterized in that, The discharge module includes a switching unit and an isolation unit. The input terminal of the switching unit is connected to the output terminal of the input module, and the output terminal of the switching unit is grounded. The control module is connected to the input terminal of the isolation unit, and the output terminal of the isolation unit is connected to the controlled terminal of the switching unit. The isolation unit allows signals to be transmitted from the input terminal to the output terminal while restricting signals from being transmitted from the output terminal to the input terminal.
3. The overvoltage self-shutdown test circuit according to claim 2, characterized in that, The isolation unit includes an optocoupler oct2, a Zener diode Z1, and a capacitor C1. The input terminal of the emitter of the optocoupler oct2 is connected to the control module, and the output terminal of the emitter of the optocoupler oct2 is grounded. The input terminal of the receiver of the optocoupler oct2 is connected to the negative terminal of the Zener diode Z1, the first terminal of the capacitor C1, and the power supply, respectively. The output terminal of the receiver of the optocoupler oct2 is connected to the controlled terminal of the switching unit. The positive terminal of the Zener diode Z1 and the tail terminal of the capacitor C1 are both grounded.
4. The overvoltage self-shutdown test circuit according to claim 2, characterized in that, The switching unit includes a semiconductor switching transistor Q1. The input terminal of the switching transistor Q1 is connected to the output terminal of the input module, the output terminal of the switching transistor Q1 is grounded, and the output terminal of the isolation unit is connected to the controlled terminal of the switching transistor Q1.
5. The overvoltage self-shutdown test circuit according to claim 1, characterized in that, The charging module includes a semiconductor switching transistor Q3 and a semiconductor switching transistor Q4. The input terminal of the switching transistor Q3 is connected to the output terminal of the input module, the output terminal of the switching transistor Q3 is connected to the energy storage module, the input terminal of the switching transistor Q4 is connected to the controlled terminal of the switching transistor Q3, the output terminal of the switching transistor Q4 is grounded, and the control module is connected to the controlled terminal of the switching transistor Q4.
6. The overvoltage self-shutdown test circuit according to claim 1, characterized in that, It also includes a discharge module, the input of which is connected to the energy storage module, and the output of which is connected to the control module and the electrical detection module.
7. The overvoltage self-shutdown test circuit according to claim 1, characterized in that, The control module includes a timing unit, which provides timing signals.
8. The overvoltage self-shutdown test circuit according to claim 1, characterized in that, The input module includes a fuse F1 and a rectifier bridge unit. The input terminal of the rectifier bridge unit is connected to the input power supply through the fuse F1, and the output terminal of the rectifier bridge unit is connected to the input terminal of the charging module and the input terminal of the discharge module, respectively.
9. A testing instrument, characterized in that, Includes an overvoltage self-shutdown test circuit as described in any one of claims 1 to 8.