CN219456317U - Bus voltage detection circuit in coal mining machine - Google Patents
Bus voltage detection circuit in coal mining machine Download PDFInfo
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- CN219456317U CN219456317U CN202320518562.XU CN202320518562U CN219456317U CN 219456317 U CN219456317 U CN 219456317U CN 202320518562 U CN202320518562 U CN 202320518562U CN 219456317 U CN219456317 U CN 219456317U
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Abstract
The utility model discloses a bus voltage detection circuit in a coal mining machine, and relates to the technical field of voltage detection circuits. The detection circuit comprises an alternating voltage acquisition unit, a rectification circuit unit, a voltage-controlled power supply type second-order active filter unit and an RC filter unit; the input end of the alternating current voltage acquisition unit is electrically connected with a mains supply, and the output end of the alternating current voltage acquisition unit is electrically connected with the input end of the rectifying circuit unit; the output end of the rectifying circuit unit is electrically connected with the input end of the voltage-controlled power supply type second-order active filter unit; the output end of the voltage-controlled power supply type second-order active filter unit is electrically connected with the input end of the RC filter unit; the output end of the RC filter unit is a signal output end of the detection circuit. The busbar voltage detection circuit in the coal mining machine has the advantages of small size and high sampling precision, and has good linearity.
Description
Technical Field
The utility model relates to the technical field of voltage detection circuits, in particular to a bus voltage detection circuit in a coal mining machine.
Background
For the coal mining machine, in order to improve the reliability and stability of the operation of the coal mining machine, various signals are usually detected, and bus voltage detection is one of the signals. Because the bus voltage in the coal mining machine is relatively high, and most of components in the coal mining machine are powered by weak current, the collection of the bus voltage is particularly important.
On the other hand, because the critical devices such as the traction transformer, the ring transformer, the airborne frequency converter, the isolating switch and the like in the coal mining machine have larger volumes, the use is limited in some scenes with strict requirements on the volume space; the current voltage acquisition module is large in size, normal in accuracy and linearity in a certain range, but after the voltage acquisition module is lower than or higher than a specific value, the linearity starts to be poor, so that voltage acquisition errors occur, and therefore, an alternating current voltage acquisition circuit with small size and accurate sampling is necessary to design.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a bus voltage detection circuit in a coal mining machine.
In order to achieve the aim of the utility model, the utility model adopts the following technical scheme:
a circuit for detecting bus voltage in a coal mining machine, comprising:
the device comprises an alternating voltage acquisition unit, a rectifying circuit unit, a voltage-controlled power supply type second-order active filter unit and an RC filter unit;
the input end of the alternating current voltage acquisition unit is electrically connected with a mains supply, and the output end of the alternating current voltage acquisition unit is electrically connected with the input end of the rectifying circuit unit;
the output end of the rectifying circuit unit is electrically connected with the input end of the voltage-controlled power supply type second-order active filter unit;
the output end of the voltage-controlled power supply type second-order active filter unit is electrically connected with the input end of the RC filter unit;
the output end of the RC filter unit is a signal output end of the detection circuit.
Optionally, the ac voltage acquisition unit includes:
the voltage transformer, the first resistor, the second resistor, the third resistor and the fourth resistor;
one end of the first resistor is electrically connected with a live wire of a mains supply, and the other end of the first resistor is connected with one end of the second resistor in series;
the other end of the second resistor is electrically connected with one input end of the voltage transformer;
one end of the third resistor is electrically connected with a zero line of a mains supply, and the other end of the third resistor is electrically connected with the other input end of the voltage transformer;
the output end of the voltage transformer is connected with one end of a fourth resistor, and the other end of the fourth resistor is grounded.
Optionally, the voltage transformer is a precision voltage transformer with a model ZMPT 101.
Optionally, the first resistor, the second resistor, the third resistor and the fourth resistor adopt high-precision resistors.
Optionally, the rectifying circuit unit includes:
the first operational amplifier, the first diode, the second diode, the fifth resistor and the sixth resistor;
the positive input end of the first operational amplifier is electrically connected with the negative electrode of the first diode, one end of the fifth resistor and one end of the sixth resistor respectively;
the positive electrode of the first diode is grounded;
the other end of the fifth resistor is electrically connected with the output end of the voltage transformer;
the output end of the first operational amplifier is electrically connected with the anode of the second diode;
the cathode of the second diode is electrically connected with the other end of the sixth resistor;
the negative phase input end of the first operational amplifier is grounded.
Optionally, the voltage-controlled power supply type second order active filter unit includes:
the second operational amplifier, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the first capacitor, the second capacitor and the potentiometer;
the non-inverting input end of the second operational amplifier is electrically connected with one end of the eighth resistor and one end of the second capacitor respectively;
the other end of the eighth resistor is electrically connected with one end of the seventh resistor and one end of the first capacitor respectively;
the other end of the seventh resistor is electrically connected with the cathode of the second diode;
the other end of the first capacitor is electrically connected with the output end of the second operational amplifier;
the negative phase input end of the second operational amplifier is respectively and electrically connected with one end of the ninth resistor and one end of the tenth resistor;
the other end of the ninth resistor is grounded;
the other end of the tenth resistor is electrically connected with one end of the potentiometer;
the other end of the potentiometer is electrically connected with the output end of the second operational amplifier.
Optionally, the RC filter unit includes:
an eleventh resistor and a third capacitor;
one end of the eleventh resistor is electrically connected with the output end of the second operational amplifier, and the other end of the eleventh resistor is electrically connected with one end of the third capacitor and is used as a signal output end of the detection circuit;
the other end of the third capacitor is grounded.
The utility model has the following beneficial effects:
the internal bus voltage detection circuit of the coal mining machine has the advantages of small volume and high sampling precision, and has good linearity; the input voltage range is 0-300VAC, the output voltage range is 0-10VDC, and the output voltage is 30 times of the input voltage, so that the power supply has good practicability.
Drawings
FIG. 1 is a schematic diagram of a bus voltage detection circuit in a coal mining machine;
fig. 2 is a schematic diagram of a bus voltage detection circuit in a coal mining machine according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1 and 2, an embodiment of the present utility model provides a bus voltage detection circuit in a coal mining machine, including:
the device comprises an alternating voltage acquisition unit, a rectifying circuit unit, a voltage-controlled power supply type second-order active filter unit and an RC filter unit;
the input end of the alternating current voltage acquisition unit is electrically connected with a mains supply, and the output end of the alternating current voltage acquisition unit is electrically connected with the input end of the rectifying circuit unit;
the output end of the rectifying circuit unit is electrically connected with the input end of the voltage-controlled power supply type second-order active filter unit;
the output end of the voltage-controlled power supply type second-order active filter unit is electrically connected with the input end of the RC filter unit;
the output end of the RC filter unit is a signal output end of the detection circuit.
In this embodiment, the ac voltage acquisition unit includes:
the voltage transformer T1, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4;
one end of the first resistor R1 is electrically connected with a live wire L of a mains supply, and the other end of the first resistor R1 is connected with one end of the second resistor R2 in series;
the other end of the second resistor R2 is electrically connected with one input end of the voltage transformer T1;
one end of the third resistor R3 is electrically connected with a zero line N of the mains supply, and the other end of the third resistor R3 is electrically connected with the other input end of the voltage transformer T1;
the output end of the voltage transformer T1 is connected with one end of a fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
The method comprises the steps of firstly outputting bus voltage in the coal mining machine through a ring transformer, and particularly adopting a precise voltage transformer with the model ZMPT101, wherein the error range is-0.3% < < f < +0.2%, and the rated current is 2mA, so that the higher alternating voltage range of the input bus voltage in the coal mining machine is reduced to a small voltage alternating current signal with the voltage of 0-300V being 0-1V; and then the voltage flowing through the fourth resistor is sampled by adopting the first resistor, the second resistor and the third resistor, and in order to keep the accuracy and the reliability of system input, the first resistor, the second resistor, the third resistor and the fourth resistor are all high-accuracy resistors, the resistance is 100K ohms, and the accuracy of the resistors is one thousandth.
In this embodiment, the rectifying circuit unit includes:
a first operational amplifier U1, a first diode D1, a second diode D2, a fifth resistor R5, and a sixth resistor R6;
the positive input end of the first operational amplifier U1 is electrically connected with the negative electrode of the first diode D1, one end of the fifth resistor R5 and one end of the sixth resistor R6 respectively;
the positive electrode of the first diode D1 is grounded;
the other end of the fifth resistor R5 is electrically connected with the output end of the voltage transformer T1;
the output end of the first operational amplifier U1 is electrically connected with the anode of the second diode D2;
the negative electrode of the second diode D2 is electrically connected with the other end of the sixth resistor R6;
the negative phase input end of the first operational amplifier U1 is grounded.
In a conventional half-wave rectification circuit adopted in the field, due to the characteristics of a diode, when the input voltage is smaller than the conduction voltage of the diode, the diode is in a cut-off state, and the output waveform is inevitably distorted; especially for rectification of small signals, this circuit is essentially disabled. In order to solve the problem, the present embodiment rectifies the small-voltage ac signal collected by the ac voltage collecting unit into a dc signal by using the precision rectification circuit composed of the first operational amplifier U1, the first diode D1, the second diode D2, the fifth resistor R5 and the sixth resistor R6, so that the distortion effect caused by the conventional rectification circuit can be avoided. In the rectifying circuit unit of the embodiment, the first diode D1 and the second diode D2 perform signal shaping on the input low-voltage ac signal, and rectify the ac into dc; the fifth resistor R5 and the sixth resistor R6 convert the signal proportion of the input end and the output end of the first operational amplifier U1, wherein the resistance value of the fifth resistor R5 is 15 Kohm, and the resistance value of the sixth resistor R6 is 16 Kohm.
In this embodiment, the voltage-controlled power supply type second order active filter unit includes:
the second operational amplifier U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a second capacitor C2 and a potentiometer;
the non-inverting input end of the second operational amplifier U2 is electrically connected with one end of the eighth resistor R8 and one end of the second capacitor C2 respectively;
the other end of the eighth resistor R8 is electrically connected with one end of the seventh resistor R7 and one end of the first capacitor C1 respectively;
the other end of the seventh resistor R7 is electrically connected with the cathode of the second diode D2;
the other end of the first capacitor C1 is electrically connected with the output end of the second operational amplifier U2;
the negative phase input end of the second operational amplifier U2 is electrically connected with one end of the ninth resistor R9 and one end of the tenth resistor R10 respectively;
the other end of the ninth resistor R9 is grounded;
the other end of the tenth resistor R10 is electrically connected with one end of the potentiometer;
the other end of the potentiometer is electrically connected with the output end of the second operational amplifier U2.
The voltage-controlled power supply type second-order active filter unit of the embodiment is composed of two RC units consisting of a seventh resistor R7, a first capacitor C1, an eighth resistor R8 and a second capacitor C2, and a reverse proportional amplifier consisting of a ninth resistor R9 and a tenth resistor R10 which are connected between the negative phase input end and the output end of the second operational amplifier U2; the potential control of the negative phase input end of the second operational amplifier U2 is provided by a voltage source composed of a ninth resistor R9 and a tenth resistor R10, so that a voltage-controlled power supply type second-order active filter is formed. The resistance values of a seventh resistor R7 and an eighth resistor R8 of the two RC units are 56 Kohms, the capacitance value of the first capacitor C1 is 1uF, and the capacitance value of the second capacitor C2 is 0.1uF; the resistance of the ninth resistor R9 of the reverse proportional amplifier is 100K ohms, and the resistance of the tenth resistor R10 is 500K ohms.
The voltage-controlled power supply type second-order active filter unit of the embodiment carries out second-order filtering on an input direct current signal through two RC units, and then amplifies and outputs the filtered signal through an inverse proportional amplifier; particularly, in the embodiment, the high-precision potentiometer is arranged in the reverse proportional amplifier, and the resistance value of the potentiometer can be changed according to the magnitude of the input voltage, so that the gain adjustment of the output signal is realized, and the output precision is improved.
In this embodiment, the RC filter unit includes:
an eleventh resistor R11 and a third capacitor C3;
one end of the eleventh resistor R11 is electrically connected with the output end of the second operational amplifier U2, and the other end of the eleventh resistor R11 is electrically connected with one end of the third capacitor C3 and is used as a signal output end of the detection circuit;
the other end of the third capacitor C3 is grounded.
According to the embodiment, the RC filter unit is arranged at the output end, so that the stability of the circuit performance can be improved, and the circuit gain is easier to adjust.
The bus voltage detection circuit in the coal mining machine provided by the embodiment of the utility model has the advantages of small volume and high sampling precision, and has good linearity; the input voltage range is 0-300VAC, the output voltage range is 0-10VDC, and the output voltage is 30 times of the input voltage, so that the power supply has good practicability.
The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present utility model and should be understood that the scope of the utility model is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (7)
1. The utility model provides a bus voltage detection circuit in coal-winning machine which characterized in that includes:
the device comprises an alternating voltage acquisition unit, a rectifying circuit unit, a voltage-controlled power supply type second-order active filter unit and an RC filter unit;
the input end of the alternating current voltage acquisition unit is electrically connected with a mains supply, and the output end of the alternating current voltage acquisition unit is electrically connected with the input end of the rectifying circuit unit;
the output end of the rectifying circuit unit is electrically connected with the input end of the voltage-controlled power supply type second-order active filter unit;
the output end of the voltage-controlled power supply type second-order active filter unit is electrically connected with the input end of the RC filter unit;
the output end of the RC filter unit is a signal output end of the detection circuit.
2. The internal bus voltage detection circuit of a coal mining machine according to claim 1, wherein the ac voltage acquisition unit comprises:
the voltage transformer, the first resistor, the second resistor, the third resistor and the fourth resistor;
one end of the first resistor is electrically connected with a live wire of a mains supply, and the other end of the first resistor is connected with one end of the second resistor in series;
the other end of the second resistor is electrically connected with one input end of the voltage transformer;
one end of the third resistor is electrically connected with a zero line of the mains supply, and the other end of the third resistor is electrically connected with the other input end of the voltage transformer;
the output end of the voltage transformer is connected with one end of a fourth resistor, and the other end of the fourth resistor is grounded.
3. The internal bus voltage detection circuit of a coal mining machine according to claim 2, wherein the voltage transformer is a precision voltage transformer of a model ZMPT 101.
4. The internal bus voltage detection circuit of a coal mining machine according to claim 2, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are high-precision resistors.
5. The internal bus voltage detection circuit of a coal mining machine according to claim 2, wherein the rectifying circuit unit comprises:
the first operational amplifier, the first diode, the second diode, the fifth resistor and the sixth resistor;
the positive input end of the first operational amplifier is electrically connected with the negative electrode of the first diode, one end of the fifth resistor and one end of the sixth resistor respectively;
the positive electrode of the first diode is grounded;
the other end of the fifth resistor is electrically connected with the output end of the voltage transformer;
the output end of the first operational amplifier is electrically connected with the anode of the second diode;
the cathode of the second diode is electrically connected with the other end of the sixth resistor;
the negative phase input end of the first operational amplifier is grounded.
6. The internal bus voltage detection circuit of claim 5, wherein the voltage-controlled power supply type second-order active filter unit comprises:
the second operational amplifier, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the first capacitor, the second capacitor and the potentiometer;
the non-inverting input end of the second operational amplifier is electrically connected with one end of the eighth resistor and one end of the second capacitor respectively;
the other end of the eighth resistor is electrically connected with one end of the seventh resistor and one end of the first capacitor respectively;
the other end of the seventh resistor is electrically connected with the cathode of the second diode;
the other end of the first capacitor is electrically connected with the output end of the second operational amplifier;
the negative phase input end of the second operational amplifier is respectively and electrically connected with one end of the ninth resistor and one end of the tenth resistor;
the other end of the ninth resistor is grounded;
the other end of the tenth resistor is electrically connected with one end of the potentiometer;
the other end of the potentiometer is electrically connected with the output end of the second operational amplifier.
7. The in-shearer bus voltage detection circuit of claim 6, wherein the RC filter unit comprises:
an eleventh resistor and a third capacitor;
one end of the eleventh resistor is electrically connected with the output end of the second operational amplifier, and the other end of the eleventh resistor is electrically connected with one end of the third capacitor and is used as a signal output end of the detection circuit;
the other end of the third capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320518562.XU CN219456317U (en) | 2023-03-17 | 2023-03-17 | Bus voltage detection circuit in coal mining machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320518562.XU CN219456317U (en) | 2023-03-17 | 2023-03-17 | Bus voltage detection circuit in coal mining machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219456317U true CN219456317U (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320518562.XU Active CN219456317U (en) | 2023-03-17 | 2023-03-17 | Bus voltage detection circuit in coal mining machine |
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| Country | Link |
|---|---|
| CN (1) | CN219456317U (en) |
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2023
- 2023-03-17 CN CN202320518562.XU patent/CN219456317U/en active Active
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