Voltage processing application device

Abstract

The utility model relates to the technical field of voltage acquisition and processing, in particular to a voltage processing application device, which comprises a positive voltage processing end, a negative voltage processing end, an operational amplifier, an offset voltage source and a potentiometer, the current adjusting module comprises a sliding resistor and an ampere meter which are connected in series; the positive voltage processing end and the negative voltage processing end are respectively connected with the positive input end and the negative input end of the operational amplifier through a resistor R3 and a resistor R4; a feedback resistor R6 is connected between the output end and the negative input end of the operational amplifier; the offset voltage source is connected with the positive input end of the operational amplifier through a potentiometer, and a resistor R5 is connected in series between the potentiometer and the positive input end. According to the utility model, the input current of the operational amplifier can be adjusted, and the output voltage is always a positive value.

Description

TECHNICAL FIELD

[0001] The utility model relates to voltage collection processing technical field, concretely is a voltage processing application device. BACKGROUND

[0002] Voltage collection processing involves power system, new energy or other fields, such as the collection and processing of bus voltage in the system, the existing collection and processing circuit mainly has two kinds, one is isolation sampling scheme, and the other is non-isolation sampling scheme. In the non-isolation sampling scheme, the voltage dividing resistor of the input end is MΩ level, when the sampling voltage is low, the input current of the operational amplifier is uA / pA level, and the anti-interference performance is poor. Moreover, when some sampling chips do not support negative value sampling, the voltage collection and processing circuit cannot be used. SUMMARY

[0003] In view of the above technical problems of the prior art, the utility model provides a voltage processing application device which can adjust the input current of the operational amplifier and make the output voltage always positive.

[0004] The utility model discloses a technical scheme that solves its technical problems:

[0005] A voltage processing application device, it includes positive voltage processing end, negative voltage processing end, operational amplifier, offset voltage source and potentiometer, the positive voltage processing end and negative voltage processing end all include the voltage dividing resistor module and current adjusting module in series, the current adjusting module includes the sliding resistance in series;The positive voltage processing end and negative voltage processing end are connected with the positive input end and negative input end of the operational amplifier through resistance R3 and resistance R4 respectively;The output end and negative input end of the operational amplifier are connected with feedback resistance R6;The offset voltage source is connected with the positive input end of operational amplifier through potentiometer, and resistance R5 is connected in series between potentiometer and positive input end.

[0006] Further, the voltage dividing resistor module includes a plurality of voltage dividing resistors.

[0007] Further, the resistance R3 and resistance R4 are equal in resistance value;Resistance R6 and resistance R5 are equal in resistance value.

[0008] Further, a current-limiting resistor R7 is arranged at the output end of the operational amplifier.

[0009] Further, the current adjusting module includes an ammeter connected in series with the sliding resistance.

[0010] Further, a capacitor C3 is arranged at the output end of the operational amplifier, and the capacitor C3 and the current-limiting resistor R7 form a filter circuit.

[0011] Further, the positive voltage processing end, the negative voltage processing end, the operational amplifier, the offset voltage source and the potentiometer are packaged in a shell, and the shell is provided with an ammeter window, a potentiometer adjusting knob, a sliding resistance adjusting end and output end interfaces of the positive voltage processing end, the negative voltage processing end and the operational amplifier.

[0012] The utility model discloses beneficial effects are:

[0013] It realizes voltage drop processing of different input voltages through the voltage dividing resistance module and the current adjusting module, and displays the input current of the operational amplifier through the ammeter, timely adjusts the current size, and avoids that the current is too small and is disturbed. It realizes positive output through the offset voltage source and the potentiometer, so that the device that does not support negative sampling can also be used. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the first embodiment circuit principle schematic drawing of the utility model;

[0015] Figure 2 It is the second embodiment circuit principle schematic drawing of the utility model; DETAILED DESCRIPTION

[0016] In order to better understand the utility model, the following will be combined with Figures 1-2 The technical scheme in the embodiment of the utility model is clearly and completely described, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor are within the protection scope of the utility model.

[0017] First embodiment:

[0018] The voltage processing application device of the utility model includes positive voltage processing end, negative voltage processing end, operational amplifier, offset voltage source V1 and potentiometer RP, and the positive voltage processing end and the negative voltage processing end all include voltage dividing resistance module and current adjusting module in series, the current adjusting module includes the sliding resistance (the sliding resistance RX1 of positive voltage processing end and the sliding resistance RX2 of negative voltage processing end) in series, when adjusting current, it can be adjusted through the sliding resistance, at this time, the current size needs to be measured manually by ammeter. Voltage dividing resistance module includes 1 or more resistors in series (such as Figure 1 The resistance R1 of the positive voltage processing end, the resistance R2 of the negative voltage processing end).

[0019] The positive and negative voltage processing terminals are connected to the positive and negative input terminals of the operational amplifier via resistors R3 and R4, respectively. A feedback resistor R6 is connected between the output terminal and the negative input terminal of the operational amplifier. The offset voltage source V1 is connected to the positive input terminal of the operational amplifier via potentiometer RP, and a resistor R5 is connected in series between potentiometer RP and the positive input terminal. Filter capacitors C1 and C2 are connected to the voltage input terminals V+ and V- of the operational amplifier, respectively.

[0020] Because operational amplifiers generate current surges during amplitude switching, a current-limiting resistor R7 is installed at the output of the operational amplifier to avoid these surges. Furthermore, a capacitor C3 is installed at the output of the operational amplifier; capacitor C3 and the current-limiting resistor R7 form a filter circuit, which prevents output signal distortion.

[0021] Second embodiment:

[0022] like Figure 2 As shown, this embodiment adds an ammeter based on the first embodiment. That is, the current adjustment module includes an ammeter connected in series with the sliding resistor, so there is no need to manually detect the current, and the reading can be directly obtained from the built-in ammeter.

[0023] Based on the circuit described above, those skilled in the art can calculate the output voltage V. out As follows: First, using the principle of equivalent circuits, we obtain: V in+ -V in- = (R3 + R4) ÷ (R1 + R2 + R x1 +R x2 +R3+R4)×(V a -V b ).

[0024] The circuit's output voltage V out =R6 / R4×(V in+ -V in- )+R3 / R4×V RP .

[0025] In this invention, the resistance values ​​of resistors R3 and R4 are set to be equal; the resistance values ​​of resistors R6 and R5 are set to be equal, then V out =R6 / R4×(V in+ -V in- )+R3 / R4×V RP =R6 / R4×(V in+ -V in- )+V RP , where V RP This is the offset voltage input to the positive input terminal of the operational amplifier. If V... in+V in- is negative, V RP is adjusted to a suitable value, V out is positive.

[0026] The above formula assumes that the input voltage V a V b = -200V, R1 and R2 are both 400KΩ, R x1 and R x2 are both 100KΩ-1MΩ slide resistors (assuming the effective resistance is adjusted to 200KΩ). R3 and R4 are both 5KΩ. R5 and R6 are both 10KΩ. Then, V in+ V in- = 10÷1210×(-200)≈-1.65V

[0027] The output voltage V out of the circuit = R6 / R4×(V in+ -V in- )+R3 / R4×V RP = V RP -3.24, at this time, as long as V RP is greater than 3.24, the output voltage is positive.

[0028] In application, the positive voltage processing end, the negative voltage processing end, the operational amplifier, the offset voltage source and the potentiometer can be packaged in the shell according to the needs of the person skilled in the art, the shape of the shell can be set conventionally, and is not limited here. The shell surface is provided with an ammeter window, a potentiometer adjusting knob, a slide resistance adjusting end, and output end interfaces of the positive voltage processing end, the negative voltage processing end and the operational amplifier. The positions and manners of the above components provided on the shell surface all belong to the conventional settings of the person skilled in the art, and thus are not limited.

[0029] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A voltage handling application device, characterized by: It includes positive voltage processing end, negative voltage processing end, operational amplifier, offset voltage source and potentiometer, the positive voltage processing end and negative voltage processing end include series voltage dividing resistance module and current adjusting module, the current adjusting module includes series slide resistance;The positive voltage processing end and negative voltage processing end are connected with the positive input end and negative input end of the operational amplifier through resistance R3 and resistance R4 respectively;The output end and negative input end of the operational amplifier are connected with feedback resistance R6;The offset voltage source is connected with the positive input end of operational amplifier through potentiometer, and resistance R5 is connected in series between potentiometer and positive input end.

2. A voltage handling application device as claimed in claim 1, characterized in that: The voltage dividing resistance module includes several voltage dividing resistors.

3. A voltage handling application device as claimed in claim 1, characterized in that: The resistance R3 and resistance R4 are equal in resistance value;Resistance R6 and resistance R5 are equal in resistance value.

4. A voltage handling application device as claimed in claim 1, characterized in that: The current limiting resistance R7 is arranged at the output end of the operational amplifier.

5. A voltage handling application device as claimed in claim 1, characterized in that: The current adjusting module includes ammeter connected in series with the slide resistance.

6. A voltage handling device as claimed in claim 4, characterized in that: The capacitor C3 is arranged at the output end of the operational amplifier, and the capacitor C3 and the current limiting resistance R7 constitute a filter circuit.

7. A voltage handling device as claimed in any one of claims 1 to 6, characterized in that: The positive voltage processing end, negative voltage processing end, operational amplifier, offset voltage source and potentiometer are packaged in the shell, and the shell surface is provided with ammeter window, potentiometer adjusting knob, slide resistance adjusting end and positive voltage processing end, negative voltage processing end and operational amplifier output end interface.

Images