Overvoltage monitoring device

Abstract

The utility model discloses an overvoltage monitoring device, which relates to the basic circuit technology and comprises an input interface, an output interface and a power supply module, the voltage detection module is used for judging the input voltage of the power supply, controlling the overvoltage monitoring device to output a low-level signal under the condition that the input voltage of the power supply is higher than a preset voltage threshold value, and controlling the overvoltage monitoring module to output a high-level signal under the condition that the input voltage of the power supply is not higher than the voltage threshold value; the overvoltage monitoring module is connected with a main controller through a signal output interface, so that the main controller controls to cut off power supply input according to a low level signal output by the overvoltage monitoring module, and the main controller controls to maintain the power supply input according to a high level signal output by the overvoltage monitoring module; and an input interface. The overvoltage monitoring device provided by the embodiment of the utility model has the advantages of real-time monitoring and quick response, and can realize full localization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of basic circuit, and in particular to an overvoltage monitoring device. BACKGROUND

[0002] With the rapid development of domestic industrial automation and intelligent manufacturing, the demand for electrical protection devices is increasing. As one of the electrical protection devices, the overvoltage monitoring device is constantly integrating new functions and improving performance, developing towards intelligentization, and thus meeting the increasing demand of electrical systems. In electrical engineering and industrial automation equipment, the overvoltage monitoring device is crucial to ensure equipment safety, prevent equipment damage and protect personnel safety.

[0003] The key technology of the overvoltage monitoring device lies in accurately measuring the monitored voltage and quickly making a judgment, and then cutting off the power supply or issuing a warning to prevent equipment damage. SUMMARY

[0004] The embodiment of the present application is used to propose an overvoltage monitoring device for real-time monitoring and fast response.

[0005] The embodiment of the present application provides an overvoltage monitoring device, comprising:

[0006] an input interface for accessing power input;

[0007] a voltage detection module for judging the input voltage of the power supply, controlling the overvoltage monitoring device to output a low-level signal when the input voltage of the power supply is higher than a pre-set voltage threshold, and controlling the overvoltage monitoring module to output a high-level signal when the input voltage of the power supply is not higher than the voltage threshold;

[0008] an overvoltage monitoring module connected with a host controller through a signal output interface, so that the host controller controls to cut off the power input according to the low-level signal output by the overvoltage monitoring module, and so that the host controller controls to maintain the power input according to the high-level signal output by the overvoltage monitoring module;

[0009] the input interface.

[0010] Optionally, the voltage detection module comprises a variable resistor R4, a resistor R5, a variable resistor R6, a capacitor C3, a capacitor C2 and a reference voltage source U2, wherein:

[0011] one end of the variable resistor R4 is connected to VCC_IN, the other end is connected to one end of the variable resistor R6, the capacitor C3, the capacitor C2, and the first end of the reference voltage source U2;

[0012] the other end of the variable resistor R6 is grounded and connected to the third end of the reference voltage source U2;

[0013] The other end of the capacitor C3 is connected to one end of the resistor R5;

[0014] The other end of the capacitor C2 is connected to the other end of the resistor R5, the second end of the reference voltage source U2.

[0015] Optionally, the overvoltage monitoring module comprises a resistor R1, a resistor R2, a resistor R3 and an optocoupler U1, wherein:

[0016] One end of the resistor R1 is connected to one end of the resistor R3 and VCC_IN, and the other end is connected to the anode of the internal diode of the optocoupler U1;

[0017] The other end of the resistor R3 is connected to the cathode of the internal diode of the optocoupler U1, and the other end of the resistor R5 and the second end of the reference voltage source U2;

[0018] The resistor R2, one end of which is connected to VCC_3V3, the other end of which is an output signal and is connected to the base of the internal triode of the optocoupler U1, and the output signal is connected to the host.

[0019] Optionally, the overvoltage monitoring module further comprises a capacitor C1, one end of which is connected between the base and the emitter of the internal triode of the optocoupler U1, and the emitter of the internal triode of the optocoupler U1 is grounded.

[0020] Optionally, the collector of the internal triode of the optocoupler U1 of the overvoltage monitoring module is left floating.

[0021] The embodiment of the present application proposes an overvoltage monitoring device for real-time monitoring and rapid response, and can realize nationalization.

[0022] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the accompanying drawings indicate the same or similar components. In the drawings:

[0024] Figure 1 The basic structure of the overvoltage monitoring device of the embodiment of the present application is shown;

[0025] Figure 2A circuit structure of the overvoltage monitoring device of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0027] The embodiment of the present application provides an overvoltage monitoring device, as shown in the accompanying drawings, comprising: Figure 1

[0028] An input interface for accessing power input;

[0029] A voltage detection module for judging the input voltage of the power supply, in the case that the input voltage of the power supply is higher than the pre-set voltage threshold, controlling the overvoltage monitoring device to output a low-level signal, and in the case that the input voltage of the power supply is not higher than the voltage threshold, controlling the overvoltage monitoring module to output a high-level signal.

[0030] An overvoltage monitoring module connected with the host controller through a signal output interface, so that the host controller controls to cut off the power input according to the low-level signal output by the overvoltage monitoring module, and so that the host controller controls to maintain the power input according to the high-level signal output by the overvoltage monitoring module.

[0031] The input interface.

[0032] In some embodiments, the voltage detection module comprises a variable resistor R4, a resistor R5, a variable resistor R6, a capacitor C3, a capacitor C2 and a reference voltage source U2, wherein:

[0033] One end of the variable resistor R4 is connected to VCC_IN, the other end is connected to one end of the variable resistor R6, the capacitor C3, the capacitor C2, and the first end of the reference voltage source U2;

[0034] The other end of the variable resistor R6 is grounded and connected to the third end of the reference voltage source U2;

[0035] The other end of the capacitor C3 is connected to one end of the resistor R5;

[0036] The other end of the capacitor C2 is connected to the other end of the resistor R5 and the second end of the reference voltage source U2.

[0037] As shown in the accompanying drawings, Figure 2 ​As shown, the P2 power input interface is connected to the voltage source to be monitored. When the voltage value of the power input to be monitored is known, the precision reference voltage source U2 outputs a voltage value 4V lower than the voltage value of the monitored power supply by changing the resistance values of the variable resistor R4 and the variable resistor R6. For example, if the voltage value of the power input to be monitored is 16V, the precision reference voltage source U2 needs to output a voltage value of 12V. The ratio of the variable resistor R4 and the variable resistor R6 can be obtained by the formula V OUT = 2.5 x (R 4 / R6 + 1) as 3.8. Then the resistance value of the variable resistor R4 can be selected as 12KΩ, and the resistance value of the variable resistor R6 can be selected as 3.16KΩ. The resistor R5 and the capacitor C3 are used to stabilize the output voltage of the precision reference voltage source U2, and the capacitor C2 is used for isolation and filtering.

[0038] In some embodiments, as shown in FIG. 2, the overvoltage monitoring module includes a resistor R1, a resistor R2, a resistor R3, and an optocoupler isolation U1, wherein: Figure 2

[0039] One end of the resistor R1 is connected to one end of the resistor R3 and VCC IN, and the other end is connected to the positive electrode of the internal diode of the optocoupler isolation U1;

[0040] The other end of the resistor R3 is connected to the negative electrode of the internal diode of the optocoupler isolation U1, and the other end of the resistor R5 and the second end of the reference voltage source U2;

[0041] The resistor R2 has one end connected to VCC 3V3 and the other end as an output signal connected to the base electrode of the internal triode of the optocoupler isolation U1, and the output signal is connected to the host controller.

[0042] In some embodiments, the overvoltage monitoring module further includes a capacitor C1, one end of the capacitor C1 is connected between the base electrode and the emitter electrode of the internal triode of the optocoupler isolation U1, and the emitter electrode of the internal triode of the optocoupler isolation U1 is grounded. In a specific example, the resistor R2 is a level pull-up resistor, which provides a high level state for the signal output interface of the optocoupler isolation U1; the capacitor C1 is a signal filtering capacitor, which provides a clean signal source input for the host controller.

[0043] Further, based on the foregoing embodiments, when the voltage difference between the two ends of the resistor R3 reaches 5V or more, the current flowing through the resistor R1 and the optocoupler isolation U1 becomes large, the LED inside the optocoupler isolation U1 is lit, and the triode inside the optocoupler isolation U1 works. At this time, the optocoupler isolation U1 outputs a low level signal.

[0044] ​When the voltage difference across resistor R3 is lower than 5V, the current flowing through resistor R1 and optocoupler isolation U1 is insufficient to light up the internal LED, the internal triode of optocoupler isolation U1 does not work, and the output level signal is still high.

[0045] Specifically, for example, a power supply in a voltage range of 7.5V-41V is connected to the power input interface, the voltage detection module performs corresponding resistance configuration through the connected voltage, so that the voltage output by the voltage detection module is 4V lower than the voltage input by the power supply. At this time, the input voltage difference of the overvoltage monitoring module is 4V. When the voltage difference exceeds 5V, the overvoltage monitoring module is turned on and outputs a low-level signal. The low-level signal is transmitted to the host through the signal output interface, and the host controls the switch to be turned off by judging that the power supply is input. If the voltage difference does not exceed 5V, the overvoltage monitoring module will not be turned on, and the output level is still high. The high-level signal is transmitted to the host through the signal output interface, and the host does not turn off the switch by judging that the power supply is normally input.

[0046] In some embodiments, the overvoltage monitoring module suspends the collector of the internal triode of the optocoupler isolation U1.

[0047] The embodiment of the present application provides an overvoltage monitoring device with real-time monitoring and fast response, and can realize localization.

[0048] It should be noted that in the embodiments of the present application, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0049] The serial numbers of the above embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0050] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments. The above specific embodiments are only illustrative, but not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims.

Claims

1. An overvoltage monitoring device, characterized by include: Input interface, used for connecting power input; The voltage detection module is used to determine the input voltage of the power supply. When the input voltage of the power supply is higher than the preset voltage threshold, the overvoltage monitoring device is controlled to output a low-level signal. When the input voltage of the power supply is not higher than the voltage threshold, the overvoltage monitoring module is controlled to output a high-level signal. An overvoltage monitoring module is connected to the main controller via a signal output interface, so that the main controller can control the power input to be cut off according to the low-level signal output by the overvoltage monitoring module, and control the power input to be maintained according to the high-level signal output by the overvoltage monitoring module. Input interface.

2. The overvoltage monitoring device of claim 1, wherein The voltage detection module includes variable resistors R4, R5, and R6, capacitors C3 and C2, and a reference voltage source U2, wherein: One end of the variable resistor R4 is connected to VCC_IN, and the other end is connected to one end of the variable resistor R6, capacitor C3, capacitor C2, and the first end of the reference voltage source U2. The other end of the variable resistor R6 is grounded and connected to the third end of the reference voltage source U2; The other end of the capacitor C3 is connected to one end of the resistor R5; The other end of the capacitor C2 is connected to the other end of the resistor R5 and the second end of the reference voltage source U2.

3. The overvoltage monitoring device of claim 2, wherein The overvoltage monitoring module includes resistors R1, R2, and R3, and an optocoupler U1, wherein: One end of resistor R1 is connected to one end of resistor R3 and VCC_IN, and the other end is connected to the positive terminal of the diode inside optocoupler isolation U1. The other end of resistor R3 is connected to the negative terminal of the internal diode of optocoupler isolation U1, and the other end of resistor R5 is connected to the second terminal of reference voltage source U2. The resistor R2 has one end connected to VCC_3V3 and the other end used as an output signal and connected to the base of the internal transistor of the optocoupler U1. The output signal is connected to the main controller.

4. The overvoltage monitoring device of claim 3, wherein The overvoltage monitoring module also includes a capacitor C1, one end of which is connected between the base and emitter of the internal transistor of the optocoupler isolation U1, and the emitter of the internal transistor of the optocoupler isolation U1 is grounded.

5. The overvoltage monitoring device of claim 3, wherein The collector of the internal transistor of the optocoupler isolation U1 in the overvoltage monitoring module is left floating.

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