Voltage monitoring circuit and device

Abstract

The utility model discloses a voltage monitoring circuit and device. The voltage monitoring circuit comprises a first amplifier, a multiplier, an integrator assembly and a control module. The positive input end of the first amplifier is connected with a to-be-measured voltage signal, and the output end of the first amplifier is connected with the first input end of the multiplier; the multiplier generates a square voltage signal to be measured based on the voltage signal to be measured and outputs the square voltage signal to the integrator assembly; the signal output end of the multiplier is connected with the reverse input end of the integrator assembly. The integrator assembly generates an integral voltage signal to be measured based on the square voltage signal to be measured and outputs the integral voltage signal to the control module; the output end of the integrator assembly is connected with the analog input end of the control module; the control module generates an effective voltage value of the to-be-measured voltage signal based on the integral to-be-measured voltage signal. The voltage monitoring circuit provided by the utility model is simple in structure and small in size, and can accurately monitor the effective value of the voltage.

Description

Technical Field

[0001] This utility model relates to the field of electronic information technology, and in particular to a voltage monitoring circuit and device. Background Technology

[0002] A vibration table simulates the various forces a product encounters during transportation and use, and is used to determine whether a product can withstand environmental vibrations. It is applicable to various industries such as electronics, electromechanical, and transportation.

[0003] Vibrators are generally electrically driven. A power amplifier amplifies a sinusoidal signal and outputs it to the vibrator. To monitor the output voltage of the power amplifier, a multimeter or voltage monitoring module is needed. However, commercially available multimeters or voltage monitoring modules have a narrow frequency response range, which cannot meet the frequency range requirements of the vibrator's power amplifier output. The readings will be distorted at high frequencies, which has significant limitations. Utility Model Content

[0004] This invention provides a voltage monitoring circuit and device. The circuit is low in cost, small in size, has a wide frequency response range, and has low requirements for the performance and program of the control module, thus enabling more accurate voltage measurement.

[0005] According to a first aspect of the present invention, a voltage monitoring circuit is provided, comprising: a first amplifier, a multiplier, an integrator assembly, and a control module;

[0006] The positive input terminal of the first amplifier is connected to the voltage signal to be measured, and the output terminal of the first amplifier is connected to the first input terminal of the multiplier.

[0007] The first input terminal of the multiplier is short-circuited to the first output terminal of the multiplier; the second input terminal of the multiplier is short-circuited to the second output terminal of the multiplier; the multiplier generates a squared voltage signal based on the voltage signal to be measured and outputs it to the integrator component; the signal output terminal of the multiplier is connected to the inverting input terminal of the integrator component; the integrator component generates an integrated voltage signal based on the squared voltage signal to be measured and outputs it to the control module;

[0008] The output of the integrator component is connected to the analog input of the control module; the control module generates the effective voltage value of the voltage signal under test based on the integrated voltage signal under test.

[0009] Optionally, it may also include a first resistor and a first capacitor;

[0010] The first end of the first resistor is connected to the voltage signal to be measured, and the second end of the first resistor is connected to the positive input terminal of the first amplifier.

[0011] The first terminal of the first capacitor is connected to the second terminal of the first resistor, and the second terminal of the first capacitor is grounded.

[0012] Optional, a third resistor may be included;

[0013] The first end of the third resistor is connected to the summation input of the multiplier, and the second end of the third resistor is grounded.

[0014] Optionally, the integrator assembly includes a fourth resistor, a fifth resistor, a second capacitor, and a second amplifier;

[0015] The first end of the fourth resistor is connected to the signal output terminal of the multiplier, and the second end of the fourth resistor is connected to the inverting input terminal of the second amplifier.

[0016] The first end of the fifth resistor is grounded, and the second end of the fifth resistor is connected to the positive input terminal of the second amplifier.

[0017] The first end of the second capacitor is connected to the inverting input terminal of the second amplifier, and the second end of the second capacitor is connected to the output terminal of the second amplifier.

[0018] Optionally, a sixth resistor and a seventh resistor may also be included;

[0019] The first end of the sixth resistor is connected to the output end of the integrator assembly, and the second end of the sixth resistor is connected to the analog input end of the control module.

[0020] The first end of the seventh resistor is connected to the second end of the sixth resistor, and the second end of the seventh resistor is grounded.

[0021] Optionally, a third capacitor may also be included;

[0022] The first terminal of the third capacitor is connected to the second terminal of the sixth resistor, and the second terminal of the third capacitor is grounded.

[0023] Optional components include a communication module and a display module;

[0024] The first end of the communication module is connected to the signal output end of the control module, and the second end of the communication module is connected to the display module.

[0025] Optionally, it also includes a power supply module, wherein the positive power supply terminal of the first amplifier is connected to the positive terminal of the power supply module, and the negative power supply terminal of the first amplifier is connected to the negative terminal of the power supply module.

[0026] Optionally, the control module includes a microcontroller.

[0027] According to a second aspect of the present invention, a voltage monitoring device is provided, comprising a vibration table and the voltage monitoring circuit described in the first aspect.

[0028] This utility model discloses a voltage monitoring circuit, comprising: a first amplifier, a multiplier, an integrator assembly, and a control module; the positive input terminal of the first amplifier is connected to the voltage signal to be measured, and the output terminal of the first amplifier is connected to the first input terminal of the multiplier; the first input terminal of the multiplier is short-circuited to the first output terminal of the multiplier; the second input terminal of the multiplier is short-circuited to the second output terminal of the multiplier; the multiplier generates a squared voltage signal based on the voltage signal to be measured and outputs it to the integrator assembly; the signal output terminal of the multiplier is connected to the inverting input terminal of the integrator assembly; the integrator assembly generates an integrated voltage signal based on the squared voltage signal to be measured and outputs it to the control module; the output terminal of the integrator assembly is connected to the analog input terminal of the control module; the control module generates the effective voltage value of the voltage signal to be measured based on the integrated voltage signal to be measured. This utility model provides a voltage monitoring circuit and device that is low in cost, small in size, has a wide frequency response range, and has low requirements for the performance and program of the control module, enabling more accurate voltage measurement.

[0029] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a voltage monitoring circuit provided by this utility model;

[0032] Figure 2 This is a partial structural block diagram of a voltage monitoring circuit provided by this utility model. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0034] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0035] Figure 1 This is a schematic diagram of a voltage monitoring circuit provided by this utility model, for reference. Figure 1 This utility model provides a voltage monitoring circuit, including: a first amplifier U2A, a multiplier U1, an integrator assembly 1, and a control module 2; the positive input terminal of the first amplifier U2A is connected to the voltage signal to be measured VIN, and the output terminal of the first amplifier U2A is connected to the first input terminal X1 of the multiplier U1; the first input terminal X1 of the multiplier U1 is short-circuited with the first output terminal Y1 of the multiplier U1; the second input terminal X2 of the multiplier U1 is short-circuited with the second output terminal Y2 of the multiplier U1; the multiplier U1 generates a squared voltage signal based on the voltage signal to be measured VIN and outputs it to the integrator assembly 1; the signal output terminal W of the multiplier U1 is connected to the inverting input terminal of the integrator assembly 1; the integrator assembly 1 generates an integrated voltage signal based on the squared voltage signal to be measured and outputs it to the control module 2; the output terminal of the integrator assembly 1 is connected to the analog input terminal of the control module 2; the control module 2 generates the effective voltage value of the voltage signal to be measured based on the integrated voltage signal to be measured.

[0036] Among them, multiplier U1 is an electronic device that multiplies two analog signals; integrator component 1 is an electronic device that converts the time integration of the input signal into the output voltage; and first amplifier U2A is a circuit unit that amplifies the voltage or power of the input signal to generate a larger output signal.

[0037] Specifically, the positive input terminal of the first amplifier U2A is connected to the voltage signal VIN to be measured, the output terminal of the first amplifier U2A is connected to the first input terminal X1 of the multiplier U1, and the inverting input terminal of the first amplifier U2A is connected to its output terminal. The first amplifier U2A amplifies the voltage signal VIN to be measured and outputs it to the multiplier U1. The first input terminal X1 of the multiplier U1 is connected to the first output terminal Y1 of the multiplier U1, and the second input terminal X2 of the multiplier U1 is connected to the second output terminal Y2 of the multiplier U1. The system receives the voltage signal VIN to be measured after being amplified by the first amplifier U2A, and performs a square calculation on the voltage signal VIN to generate a squared voltage signal to be measured, which is then output to the integrator component 1. The signal output terminal W of the multiplier U1 is connected to the inverting input terminal of the integrator component 1. The integrator component 1 receives the squared voltage signal to be measured transmitted by the multiplier U1, performs an integration operation to generate an integrated voltage signal to be measured, which is then output to the control module 2. The control module 2 performs calculations based on the integrated voltage signal to be measured transmitted by the integrator component 1 to generate the effective voltage value of the voltage signal VIN to be measured.

[0038] Optional, continue to refer to Figure 1 The voltage monitoring circuit also includes a first resistor R1 and a first capacitor C1. The first end of the first resistor R1 is connected to the voltage signal VIN to be measured, and the second end of the first resistor R1 is connected to the positive input terminal of the first amplifier U2A. The first end of the first capacitor C1 is connected to the first end of the first resistor R1, and the second end of the first capacitor C1 is grounded.

[0039] Specifically, the voltage monitoring circuit provided in this embodiment of the present invention further includes a first resistor R1 and a first capacitor C1. The first end of the first resistor R1 is connected to the voltage signal VIN to be measured, and the second end of the first resistor is connected to the first amplifier U2A. The first end of the first capacitor C1 is connected to the second end of the first resistor R1, and the second end of the first capacitor C1 is grounded. The first resistor R1 and the first capacitor C1 form the filtering circuit of this voltage monitoring circuit, which is mainly used to filter the voltage signal VIN to be measured, separate the voltage signal VIN to be measured from useless noise, thereby improving the anti-interference ability of the signal.

[0040] Optional, continue to refer to Figure 1 The voltage monitoring circuit also includes a third resistor R3;

[0041] The first end of the third resistor R3 is connected to the summation input Z of the multiplier U1, and the second end of the third resistor R3 is grounded.

[0042] Specifically, the first end of the third resistor R3 is connected to the summation input Z of the multiplier U1, and the second end of the third resistor R3 is grounded. The summation input of the multiplier U1 allows other signals to be input. The square of the voltage signal VIN to be measured can be calculated and then added to the new input signal, or no input can be input. The multiplier U1 will calculate the square of the voltage signal VIN to be measured and then output it to the integrator component 1. It can be seen that there is no new signal input in this embodiment of the utility model.

[0043] Optionally, the integrator assembly 1 includes a fourth resistor R4, a fifth resistor R5, a second capacitor C2, and a second amplifier U2B; the first end of the fourth resistor R4 is connected to the signal output terminal W of the multiplier U1, and the second end of the fourth resistor R4 is connected to the inverting input terminal of the second amplifier U2B; the first end of the fifth resistor R5 is grounded, and the second end of the fifth resistor R5 is connected to the non-inverting input terminal of the second amplifier U2B; the first end of the second capacitor C2 is connected to the inverting input terminal of the second amplifier U2B, and the second end of the second capacitor C2 is connected to the output terminal of the second amplifier U2B.

[0044] Specifically, the integrator assembly 1 is composed of the fourth resistor R4, the fifth resistor R5, the second capacitor C2, and the second amplifier U2B. The first end of the fourth resistor R4 is connected to the signal output terminal W of the multiplier, and the second end of the fourth resistor R4 is connected to the inverting input terminal of the second amplifier U2B. The multiplier U1 transmits the measured voltage signal VIN after squaring to the second amplifier U2B. The first end of the fifth resistor R5 is grounded, and the second end of the fifth resistor R5 is connected to the non-inverting input terminal of the second amplifier U2B. The first end of the second capacitor C2 is connected to the inverting input terminal of the second amplifier U2B, and the second end of the second capacitor C2 is connected to the output terminal of the second amplifier U2B. The second capacitor C2 can improve the gain stability of the second amplifier U2B, reduce noise, suppress high-frequency interference signals, and improve the signal-to-noise ratio.

[0045] Optional, see reference Figure 1 The voltage monitoring circuit also includes a sixth resistor R6 and a seventh resistor R7; the first end of the sixth resistor R6 is connected to the output end of the integrator component 1, and the second end of the sixth resistor R6 is connected to the analog input end of the control module 2; the first end of the seventh resistor R7 is connected to the second end of the sixth resistor R6, and the second end of the seventh resistor R7 is grounded.

[0046] Specifically, the first end of the sixth resistor R6 is connected to the output end of the integrator component 1, the second end of the sixth resistor R6 is connected to the analog input end of the control module 2, the first end of the seventh resistor R7 is connected to the second end of the sixth resistor R6, the second end of the seventh resistor R7 is grounded, the sixth resistor R6 and the seventh resistor R7 are connected in parallel to divide the transmitted integrated voltage signal under test, and the voltage signal under test VIN after integration is divided and transmitted to the control module 2.

[0047] Optionally, the voltage monitoring circuit also includes a third capacitor C3; the first terminal of the third capacitor C3 is connected to the second terminal of the sixth resistor R6, and the second terminal of the third capacitor C3 is grounded.

[0048] Specifically, the first terminal of the third capacitor C3 is connected to the second terminal of the sixth resistor R6, and the second terminal of the third capacitor C3 is grounded. The sixth resistor R6, while being connected in parallel with the seventh resistor R7 to divide the voltage, also forms a filter circuit with the third capacitor C3 to filter the integrated voltage signal to be measured.

[0049] Figure 2 This is a partial structural block diagram of a voltage monitoring circuit provided by this utility model, for reference. Figure 2 Optionally, it includes a communication module 3 and a display module 4; the first end of the communication module 3 is connected to the signal output end of the control module 2, and the second end of the communication module 3 is connected to the display module 4.

[0050] Specifically, the communication module 3 is connected to the control module 2. The communication module 3 is used to receive the effective voltage value calculated by the control module 2 and transmit it to the display module 4. For example, the display module 4 can be a display screen.

[0051] Optionally, the voltage monitoring circuit also includes a power supply module (not shown in the figure), with the positive power supply terminal V+ of the first amplifier U2A connected to the positive terminal of the power supply module, and the negative power supply terminal V- of the first amplifier U2A connected to the negative terminal of the power supply module.

[0052] Specifically, the positive terminal of the power supply module is connected to the positive power supply terminal of the first amplifier U2A, and the negative terminal of the power supply module is connected to the negative power supply terminal of the first amplifier U2A. The power supply module is used to supply power to the voltage monitoring circuit.

[0053] Optionally, control module 2 includes a microcontroller.

[0054] Specifically, the first amplifier U2A can be an OPA2192, the multiplier U1 can be an AD633, and the microcontroller can be an STM8S005C6. This utility model does not limit these features.

[0055] Based on the above-described embodiments of the utility model, the following is the calculation process for the voltage signal to be measured:

[0056]

[0057] in,

[0058] Equation (1) can be simplified to:

[0059]

[0060] Equation (ii) can be simplified to:

[0061]

[0062] Substituting formula (iii) into formula (i), we get:

[0063]

[0064] Where P is power, U e Here, R is the effective voltage value, U is the resistance, T is the time, ω is the angular velocity, and A is a constant.

[0065] For example, suppose a voltage with a peak-to-peak value of 100V is pre-divided (assuming a division ratio of 1 / 10), resulting in an input voltage with a peak-to-peak value of 10V. This input voltage is then squared by a multiplier, resulting in a peak value of 25V. After passing through an integrator, it becomes a DC voltage with a level of approximately 12.5V. The control module then takes the square root of this signal to obtain the effective value of 3.53V (the final step in the derivation process). Multiplying this by the pre-dividing coefficient gives the original signal's effective value of 35.3V.

[0066] This utility model provides a voltage monitoring device, including a vibration table and the voltage monitoring circuit described in the above utility model embodiment.

[0067] The voltage monitoring device provided in this embodiment of the present invention can achieve the same technical effect as the voltage monitoring circuit provided in the above embodiment of the present invention, and will not be described again here.

[0068] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A voltage monitoring circuit, characterized in that, include: First amplifier, multiplier, integrator assembly and control module; The positive input terminal of the first amplifier is connected to the voltage signal to be measured, and the output terminal of the first amplifier is connected to the first input terminal of the multiplier. The first input terminal of the multiplier is short-circuited to the first output terminal of the multiplier; the second input terminal of the multiplier is short-circuited to the second output terminal of the multiplier; the multiplier generates a squared voltage signal based on the voltage signal to be measured and outputs it to the integrator component; the signal output terminal of the multiplier is connected to the inverting input terminal of the integrator component; the integrator component generates an integrated voltage signal based on the squared voltage signal to be measured and outputs it to the control module; The output of the integrator component is connected to the analog input of the control module; the control module generates the effective voltage value of the voltage signal under test based on the integrated voltage signal under test.

2. The voltage monitoring circuit according to claim 1, characterized in that, It also includes a first resistor and a first capacitor; The first end of the first resistor is connected to the voltage signal to be measured, and the second end of the first resistor is connected to the positive input terminal of the first amplifier. The first terminal of the first capacitor is connected to the second terminal of the first resistor, and the second terminal of the first capacitor is grounded.

3. The voltage monitoring circuit according to claim 1, characterized in that, Including the third resistor; The first end of the third resistor is connected to the summation input of the multiplier, and the second end of the third resistor is grounded.

4. The voltage monitoring circuit according to claim 1, characterized in that, The integrator assembly includes a fourth resistor, a fifth resistor, a second capacitor, and a second amplifier; The first end of the fourth resistor is connected to the signal output terminal of the multiplier, and the second end of the fourth resistor is connected to the inverting input terminal of the second amplifier. The first end of the fifth resistor is grounded, and the second end of the fifth resistor is connected to the positive input terminal of the second amplifier. The first end of the second capacitor is connected to the inverting input terminal of the second amplifier, and the second end of the second capacitor is connected to the output terminal of the second amplifier.

5. The voltage monitoring circuit according to claim 1, characterized in that, It also includes the sixth and seventh resistors; The first end of the sixth resistor is connected to the output end of the integrator assembly, and the second end of the sixth resistor is connected to the analog input end of the control module. The first end of the seventh resistor is connected to the second end of the sixth resistor, and the second end of the seventh resistor is grounded.

6. The voltage monitoring circuit according to claim 5, characterized in that, It also includes a third capacitor; The first terminal of the third capacitor is connected to the second terminal of the sixth resistor, and the second terminal of the third capacitor is grounded.

7. The voltage monitoring circuit according to claim 1, characterized in that, Includes a communication module and a display module; The first end of the communication module is connected to the signal output end of the control module, and the second end of the communication module is connected to the display module.

8. The voltage monitoring circuit according to claim 1, characterized in that, It also includes a power supply module, wherein the positive power supply terminal of the first amplifier is connected to the positive terminal of the power supply module, and the negative power supply terminal of the first amplifier is connected to the negative terminal of the power supply module.

9. The voltage monitoring circuit according to claim 1, characterized in that, The control module includes a microcontroller.

10. A voltage monitoring device, characterized in that, It includes a vibration table and a voltage monitoring circuit as described in any one of claims 1-9.

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