Voltage monitoring device suitable for voltage rapid change circuit

Abstract

The utility model relates to the technical field of circuits, and discloses a voltage monitoring device suitable for a voltage rapid change circuit, which comprises an undervoltage monitoring circuit, an overvoltage monitoring circuit and a microcontroller, the input end of the undervoltage monitoring circuit is provided with an undervoltage cut-off transient suppression diode V1, the output end of the transient suppression diode V1 is connected to the first impedance matching circuit through the first divider resistance circuit, and the output end of the first impedance matching circuit is connected with the input end of the microcontroller; the input end of the overvoltage monitoring circuit is provided with an overvoltage conduction transient suppression diode V2, the output end of the transient suppression diode V1 is connected to a second impedance matching circuit through a second divider resistance circuit, and the output end of the second impedance matching circuit is connected with the input end of the microcontroller. The circuit provided by the utility model can achieve the quick and accurate monitoring of voltage information, can judge the overvoltage and undervoltage conditions in real time, improves the accuracy of voltage monitoring, and also shortens the response time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of circuit protection, specifically relates to a voltage monitoring device suitable for voltage fast change circuit. BACKGROUND

[0002] In the field of power electronics, real-time monitoring and abnormal determination of the power supply voltage are the key to ensuring the stable operation of the system or device. By monitoring the specific power supply voltage in real time and determining whether it is within the required range, timely and accurate determination of voltage abnormalities is made, and the monitoring information and determination information are transmitted to the use end, which can effectively ensure the normal and stable operation of the system and device, avoid equipment damage, system failure and even safety accidents.

[0003] The traditional voltage monitoring method mainly adopts resistance voltage division sampling technology, which can realize real-time sampling of voltage, but has some limitations. First, the resistance voltage division sampling method cannot accurately determine the interference signal on the line, which may lead to misjudgment or missed judgment of voltage abnormality. Second, although interference can be reduced by filtering, this method will reduce the response speed of the system and affect the timeliness. Especially in devices that require fast response to voltage abnormalities, the traditional method cannot meet the requirement of immediacy. SUMMARY

[0004] In order to solve the problems and deficiencies in the prior art, the utility model provides a voltage monitoring device suitable for voltage fast change circuit, which can realize fast and accurate monitoring of voltage information and real-time determination of overvoltage and undervoltage.

[0005] In order to achieve the above invention purpose, the technical scheme of the utility model is as follows:

[0006] A voltage monitoring device suitable for voltage fast change circuit, comprising an undervoltage monitoring circuit, an overvoltage monitoring circuit and a microcontroller; the input end of the undervoltage monitoring circuit is provided with an undervoltage cutoff transient suppression diode V1, the output end of the transient suppression diode V1 is connected to the first impedance matching circuit through the first voltage division resistor circuit, and the output end of the first impedance matching circuit is connected with the input end of the microcontroller; the input end of the overvoltage monitoring circuit is provided with an overvoltage conduction transient suppression diode V2, the output end of the transient suppression diode V1 is connected to the second impedance matching circuit through the second voltage division resistor circuit, and the output end of the second impedance matching circuit is connected with the input end of the microcontroller.

[0007] Preferably, the first voltage divider resistor circuit includes resistors R1, R3, and R6 connected in series at the output terminal of transient suppression diode V1, with the other end of resistor R6 grounded; the input terminal of the first impedance matching circuit is connected between resistors R3 and R6, and the output terminal is connected to the input terminal of the microcontroller.

[0008] Preferably, the second voltage divider resistor circuit includes resistors R2, R4, and R7 connected in series at the output terminal of transient suppression diode V2, with the other end of resistor R7 grounded; the input terminal of the second impedance matching circuit is connected between resistors R4 and R7, and the output terminal is connected to the input terminal of the microcontroller.

[0009] Preferably, the first impedance matching circuit includes a resistor R5 and a first operational amplifier UA. The input terminal of the resistor R5 is connected to the first voltage divider resistor circuit, and the other end is connected to the positive input terminal of the first operational amplifier UA. The output terminal of the first operational amplifier UA is connected to the input terminal of the microcontroller, and a first feedback loop is provided between the output terminal and the negative input terminal of the first operational amplifier UA.

[0010] Preferably, the second impedance matching circuit includes a resistor R8 and a second operational amplifier UB. The input terminal of the resistor R8 is connected to the second voltage divider resistor circuit, and the other end is connected to the positive input terminal of the second operational amplifier UB. The output terminal of the second operational amplifier UB is connected to the input terminal of the microcontroller. A second feedback loop is provided between the output terminal and the negative input terminal of the second operational amplifier UB.

[0011] The beneficial effects of this utility model are:

[0012] This invention achieves rapid and accurate monitoring of voltage information through the combination of transient suppression diodes and voltage divider detection circuits, and can determine over- and under-voltage conditions in real time. The circuit design of this invention not only improves the accuracy of voltage monitoring but also shortens the response time, meeting the stringent requirements for voltage monitoring in modern power electronics. Attached Figure Description

[0013] The foregoing and hereinafter detailed description of this utility model becomes clearer when read in conjunction with the following drawings, in which:

[0014] Figure 1 This is the voltage monitoring circuit diagram of this utility model.

[0015] In the picture:

[0016] 1. Undervoltage monitoring circuit; 2. Overvoltage monitoring circuit; 3. Microcontroller; 4. First voltage divider resistor circuit; 5. First impedance matching circuit; 6. Second voltage divider resistor circuit; 7. Second impedance matching circuit. DETAILED DESCRIPTION

[0017] In order for those skilled in the art to better understand the technical solutions in the utility model, the following will further illustrate the technical solutions for realizing the purposes of the utility model through several specific embodiments, and it should be noted that the technical solutions claimed by the utility model include but are not limited to the following embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative efforts should belong to the scope of protection of the utility model.

[0018] Embodiment 1

[0019] The embodiment discloses a voltage monitoring device suitable for a voltage fast change circuit, the voltage monitoring device comprises an under-voltage monitoring circuit 1 and an over-voltage monitoring circuit 2 which are arranged in parallel at an output end of a to-be-detected power supply, and to-be-detected voltages output by the to-be-detected power supply enter the under-voltage monitoring circuit 1 and the over-voltage monitoring circuit 2 respectively to perform voltage monitoring, and over-voltage and under-voltage conditions are determined in real time. Figure 1 The utility model voltage monitoring circuit diagram, refer to the description attached Figure 1 The under-voltage monitoring circuit comprises a transient suppression diode V1, a resistor R1, a resistor R3 and a resistor R6 which are connected in series at the output end of the to-be-detected power supply in sequence, and the other end of the resistor R6 is grounded, the transient suppression diode V1 is turned on when the input voltage is normal and is cut off when the voltage is under-voltage; a first impedance matching circuit 5 is arranged between the resistor R3 and the resistor R6, the first impedance matching circuit 5 comprises a resistor R8 and a first operational amplifier UB, the input end of the resistor R8 is connected between the resistor R3 and the resistor R6, the other end is connected with the positive input end of the first operational amplifier UB, and the output end of the first operational amplifier UB is connected with the input end of the microcontroller 3, and a first feedback loop is arranged between the output end and the negative input end of the first operational amplifier UB.

[0020] The over-voltage monitoring circuit 2 comprises a transient suppression diode V2, a resistor R2, a resistor R4 and a resistor R7 which are connected in series at the output end of the to-be-detected power supply in sequence, the other end of the resistor R7 is grounded, the transient suppression diode V2 is cut off when the input voltage is normal and is turned on when the voltage is over-voltage; a second impedance matching circuit 7 is arranged between the resistor R4 and the resistor R7, the second impedance matching circuit 7 comprises a resistor R5 and a first operational amplifier UA, the input end of the resistor R5 is connected between the resistor R4 and the resistor R7, the other end is connected with the positive input end of the first operational amplifier UA, and the output end of the first operational amplifier UA is connected with the input end of the microcontroller 3, and a first feedback loop is arranged between the output end and the negative input end of the first operational amplifier UA.

[0021] In the embodiment depicted in the utility model, the resistance R1, resistance R3 and resistance R6 constitute a first voltage dividing resistance circuit 4; the resistance R2, resistance R4 and resistance R7 constitute a second voltage dividing resistance circuit 6.

[0022] In the embodiment depicted in the utility model, the model of the first operational amplifier UA and the second operational amplifier UB is Aip2904, and the model of the microcontroller 3 is kf32A156.

[0023] In the embodiment depicted in the utility model, the to-be-measured voltage output by the to-be-measured power supply is input into the under-voltage monitoring circuit 1 and the over-voltage monitoring circuit 2 respectively, when the to-be-measured voltage appears under-voltage or over-voltage, the corresponding monitoring circuit is turned on or cut off, the to-be-measured voltage enters the operational amplifier after being divided by the resistance, then the collected signal is input into the microcontroller 3, voltage signal sampling and transmission are completed, and the microcontroller 3 performs under-voltage or over-voltage alarm.

[0024] Embodiment 2

[0025] The embodiment discloses a voltage monitoring device suitable for a voltage rapid change circuit, and the working process and principle of the circuit are as follows: when the circuit works, the to-be-measured voltage output by the to-be-measured power supply enters the under-voltage monitoring circuit 1 and the over-voltage monitoring circuit 2 for monitoring respectively; wherein,

[0026] The under-voltage monitoring circuit 1, the transient suppression diode V1 arranged at the input end, when the voltage is normal, V1 is turned on, voltage information is divided by the resistance R1, the resistance R3, the resistance R6 and V1, impedance matching is completed through the first impedance matching circuit 5, enters the microcontroller 3, voltage signal sampling and signal transmission are completed, at this time, the normal voltage information in the working process is uploaded through the microcontroller 3; when the voltage is abnormal under-voltage, V1 is cut off, voltage is 0V after being divided by the resistance R1, the resistance R3, the resistance R6 and V1, impedance matching is completed through the first impedance matching circuit, enters the microcontroller 3, voltage signal sampling is 0V, and the microcontroller is sampled to 0V and under-voltage alarm is performed.

[0027] The overvoltage monitoring circuit 2, the transient suppression diode V2 arranged at the input end, when the voltage is normal, V2 is cut off, voltage information is divided through the resistor R2, the resistor R4, the resistor R7 and V2, then impedance matching is completed through the second impedance matching circuit 7, enters the microcontroller 3, voltage signal sampling and signal transmission are completed, and the sampling voltage is 0V at this time;When the voltage is abnormal overvoltage, V2 is turned on, voltage information is divided through the resistor R2, the resistor R4, the resistor R7 and V2, then impedance matching is completed through the second impedance matching circuit 7, enters the microcontroller 3, voltage signal sampling and signal transmission are completed, and the sampling voltage is abnormal overvoltage voltage at this time, and the microcontroller 3 carries out overvoltage alarm.

[0028] The above is only the preferred embodiment of the present application, and does not limit the present application in any form, and any simple modification or equivalent change made according to the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A voltage monitoring device suitable for use in a voltage rapidly varying circuit, characterized by The application relates to an under-voltage monitoring circuit (1), an over-voltage monitoring circuit (2) and a microcontroller (3); the input end of the under-voltage monitoring circuit (1) is provided with an under-voltage cut-off transient suppression diode V1, the output end of the transient suppression diode V1 is connected to a first impedance matching circuit (5) through a first voltage dividing resistor circuit (4), and the output end of the first impedance matching circuit (5) is connected to the input end of the microcontroller (3); the input end of the over-voltage monitoring circuit (2) is provided with an over-voltage conduction transient suppression diode V2, the output end of the transient suppression diode V1 is connected to a second impedance matching circuit (7) through a second voltage dividing resistor circuit (6), and the output end of the second impedance matching circuit (7) is connected to the input end of the microcontroller (3).

2. A voltage monitoring device for use in a voltage rapidly changing circuit according to claim 1, characterized in that, The first voltage dividing resistor circuit (4) comprises a resistor R1, a resistor R3 and a resistor R6 which are connected in series at the output end of the transient suppression diode V1 in sequence, and the other end of the resistor R6 is grounded; the input end of the first impedance matching circuit (5) is connected between the resistor R3 and the resistor R6, and the output end is connected to the input end of the microcontroller (3).

3. The voltage monitoring device for a voltage rapidly changing circuit according to claim 1, wherein The second voltage dividing resistor circuit (6) comprises a resistor R2, a resistor R4 and a resistor R7 which are connected in series at the output end of the transient suppression diode V2 in sequence, and the other end of the resistor R7 is grounded; the input end of the second impedance matching circuit (7) is connected between the resistor R4 and the resistor R7, and the output end is connected to the input end of the microcontroller (3).

4. The voltage monitoring device for a voltage rapidly changing circuit according to claim 1, wherein The first impedance matching circuit (5) comprises a resistor R8 and a first operational amplifier UB, the input end of the resistor R8 is connected to the first voltage dividing resistor circuit (4), the other end is connected to the positive input end of the first operational amplifier UB, the output end of the first operational amplifier UB is connected to the input end of the microcontroller (3), and a first feedback loop is arranged between the output end and the negative input end of the first operational amplifier UB.

5. The voltage monitoring device for a voltage rapidly changing circuit according to claim 1, wherein The second impedance matching circuit comprises a resistor R5 and a second operational amplifier UA, the input end of the resistor R5 is connected to the second voltage dividing resistor circuit (6), the other end is connected to the positive input end of the second operational amplifier UA, the output end of the second operational amplifier UA is connected to the input end of the microcontroller (3), and a second feedback loop is arranged between the output end and the negative input end of the second operational amplifier UA.

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