CN111812387A - Positive and negative voltage sampling shunt circuit - Google Patents
Positive and negative voltage sampling shunt circuit Download PDFInfo
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- CN111812387A CN111812387A CN202010918311.1A CN202010918311A CN111812387A CN 111812387 A CN111812387 A CN 111812387A CN 202010918311 A CN202010918311 A CN 202010918311A CN 111812387 A CN111812387 A CN 111812387A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
Abstract
The invention relates to a positive and negative voltage sampling shunt circuit, comprising: the bidirectional Hall sensor comprises a bidirectional Hall sensor acquisition circuit, a positive voltage sampling circuit and a negative voltage sampling circuit; the output end of the bidirectional Hall sensor acquisition circuit is connected with the forward voltage sampling circuit, and the forward voltage sampling circuit samples the forward voltage in the voltage output by the bidirectional Hall sensor acquisition circuit; the output end of the bidirectional Hall sensor acquisition circuit is connected with the negative voltage sampling circuit, and the negative voltage sampling circuit samples the negative voltage in the voltage output by the bidirectional Hall sensor acquisition circuit. The positive and negative voltage sampling shunt circuit has simple circuit structure, can realize the sampling of positive voltage and negative voltage at the same time, has short sampling time and high efficiency, and does not generate burrs because the positive and negative voltage signals are not mutually doped and interfered.
Description
Technical Field
The invention relates to the field of electricity, in particular to a positive and negative voltage sampling shunt circuit.
Background
In the current circuit acquisition system, output voltages of various sensors need to be acquired as signal quantities for control or state judgment. The existing positive and negative voltage sampling circuit has a complex circuit structure and various components, and often cannot accurately and reliably sample the output voltages of various sensors, the sampling time of the positive and negative voltages is long, the acquisition efficiency is low, and burrs and interference are doped in sampling signals.
Disclosure of Invention
The present invention is directed to solve the above problems in the prior art, and provides a positive and negative voltage sampling shunt circuit.
In order to achieve the above object, the present invention provides a positive and negative voltage sampling shunt circuit, including: the bidirectional Hall sensor comprises a bidirectional Hall sensor acquisition circuit, a positive voltage sampling circuit and a negative voltage sampling circuit;
the output end of the bidirectional Hall sensor acquisition circuit is connected with the forward voltage sampling circuit, and the forward voltage sampling circuit samples the forward voltage in the voltage output by the bidirectional Hall sensor acquisition circuit;
the output end of the bidirectional Hall sensor acquisition circuit is connected with the negative voltage sampling circuit, and the negative voltage sampling circuit samples the negative voltage in the voltage output by the bidirectional Hall sensor acquisition circuit.
According to one aspect of the present invention, the forward voltage sampling circuit is composed of a first diode D1, a first forward input resistor R1, a first backward input resistor R2, a voltage dividing resistor R3, a first negative feedback resistor R4, a first filter capacitor C1, a first feedback capacitor C2, a first output resistor R5, a first output voltage dividing resistor R6, and a first operational amplifier U1.
According to one aspect of the invention, the anode of the first diode D1 is connected to ground, and the cathode thereof is connected to the bidirectional hall sensor output;
one end of the first forward input resistor R1 is connected with the output end of the bidirectional Hall sensor, and the other end of the first forward input resistor R1 is connected with the positive input end of the first operational amplifier U1;
one end of the divider resistor R3 is connected with the positive input end of the first operational amplifier U1, and the other end is connected with the ground wire;
one end of the first reverse input resistor R2 is connected with the ground wire, and the other end of the first reverse input resistor R2 is connected with the negative input end of the first operational amplifier U1;
one end of the first negative feedback resistor R4 is connected with the negative input end of the first operational amplifier U1, and the other end is connected with the output end of the first operational amplifier U1;
the first feedback capacitor C2 is connected in parallel with the first degeneration resistor R4;
one end of the first output resistor R5 is connected with the output end of the first operational amplifier U1, and the other end is connected with the first output divider resistor R6;
one end of the first output voltage-dividing resistor R6 is connected with the first output resistor R5, and the other end of the first output voltage-dividing resistor R6 is connected with the ground wire;
the first filter capacitor C1 is connected in parallel with the first output voltage-dividing resistor R6;
each pin of the first operational amplifier U1 is connected to the first diode D1, the first forward input resistor R1, the first reverse input resistor R2, the voltage dividing resistor R3, the first degeneration resistor R4, the first filter capacitor C1, the first feedback capacitor C2, the first output resistor R5, and the first output voltage dividing resistor R6, respectively.
According to one aspect of the present invention, the negative voltage sampling circuit is composed of a second diode D2, a second positive input resistor R7, a second negative input resistor R8, a second negative feedback resistor R9, a second filter capacitor C3, a second feedback capacitor C4, a second output resistor R10, a second output voltage-dividing resistor R11, and a second operational amplifier U2.
According to an aspect of the present invention, one end of the second forward input resistor R7 is connected to ground, and the other end is connected to the positive input terminal of the second operational amplifier U2;
one end of the second reverse input resistor R8 is connected with the output end of the bidirectional Hall sensor, and the other end of the second reverse input resistor R8 is connected with the negative input end of the second operational amplifier U2;
the anode of the second diode D2 is connected to one end of the second degeneration resistor R9, and the cathode thereof is connected to the negative input terminal of the second operational amplifier U2;
one end of the second negative feedback resistor R9 is connected with the anode of the second diode D2, and the other end is connected with the output end of the second operational amplifier U2;
one end of the second feedback capacitor C4 is connected to the cathode of the second diode D2, and the other end is connected to the output end of the second operational amplifier U2;
one end of the second output resistor R10 is connected with the output end of the second operational amplifier U2, and the other end is connected with the second output divider resistor R11;
one end of the second output voltage-dividing resistor R11 is connected with the second output resistor R10, and the other end of the second output voltage-dividing resistor R11 is connected with the ground wire;
the second feedback capacitor C4 is connected in parallel with the second output voltage-dividing resistor R11;
each pin of the second operational amplifier U2 is connected to the second diode D2, the second forward input resistor R7, the second reverse input resistor R8, the second degeneration resistor R9, the second filter capacitor C3, the second feedback capacitor C4, the second output resistor R10, and the second output voltage-dividing resistor R11.
According to one aspect of the invention, the bidirectional Hall sensor acquisition circuit outputs voltage signals which are positive and negative voltage signal values, and the output voltage signals are signal values of-5V to + 5V;
the output voltage signals of the positive voltage sampling circuit and the negative voltage sampling circuit are both 0-5V signal values.
According to one aspect of the invention, the forward voltage sampling circuit input impedance is in a high impedance state;
the input impedance of the negative voltage sampling circuit is in a high impedance state.
According to one aspect of the invention, when the output voltage signal of the bidirectional Hall sensor acquisition circuit is 0 to +5V signal, the output voltage signal of the forward voltage sampling circuit is 0 to +5V signal;
when the output voltage signal of the bidirectional Hall sensor acquisition circuit is a-5V-0 signal, the output voltage signal of the forward voltage sampling circuit is a 0V signal.
According to one aspect of the invention, when the output voltage signal of the bidirectional Hall sensor acquisition circuit is a-5V-0 signal, the output voltage signal of the negative voltage sampling circuit is a 0-5V signal;
when the output voltage signal of the bidirectional Hall sensor acquisition circuit is a 0-5V signal, the output voltage signal of the negative voltage sampling circuit is a 0V signal.
According to one scheme of the invention, due to the arrangement of the bidirectional Hall sensor, the circuit structure of the acquisition circuit is simple, the sampling of positive voltage and negative voltage can be realized simultaneously, the sampling time is short, and the efficiency is high.
According to one scheme of the invention, the positive voltage sampling circuit and the negative voltage sampling circuit are simple in circuit structure arrangement, the sampling of positive voltage signals and negative voltage signals can be realized through simple circuit structure arrangement, the two signals cannot interfere with each other, and burrs cannot be generated in each signal. And because the bidirectional Hall sensor is respectively connected with the positive sampling circuit and the negative sampling circuit, the acquisition of bidirectional voltage signals can be realized by adopting a single bidirectional sensor device, and the acquisition function of the bidirectional voltage signals which can be acquired by utilizing complicated and various assembly structures in the prior art can be realized by adopting a simple circuit assembly structure.
Drawings
FIG. 1 is a schematic representation of a positive and negative voltage sampling shunt circuit configuration according to one embodiment of the present invention;
FIG. 2 schematically illustrates a graph of output characteristics of a bi-directional Hall sensor acquisition circuit, a positive voltage sampling circuit, and a negative voltage sampling circuit, according to one embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
Fig. 1 schematically shows a configuration of a positive and negative voltage sampling shunt circuit according to an embodiment of the present invention. As shown in fig. 1, in the present embodiment, the positive/negative voltage sampling shunt circuit according to the present invention includes: the device comprises a bidirectional Hall sensor acquisition circuit 1, a positive voltage sampling circuit 2 and a negative voltage sampling circuit 3.
As shown in fig. 1, in the present embodiment, the output terminal of the bidirectional hall sensor sampling circuit is connected to a forward voltage sampling circuit, and the forward voltage sampling circuit samples a forward voltage among voltages output from the bidirectional hall sensor sampling circuit. The output end of the bidirectional Hall sensor acquisition circuit is connected with the negative voltage sampling circuit, and the negative voltage sampling circuit samples the negative voltage in the voltage output by the bidirectional Hall sensor acquisition circuit.
According to the arrangement of the bidirectional Hall sensor, the circuit structure of the acquisition circuit is simple, the sampling of positive voltage and negative voltage can be realized simultaneously, the sampling time is short, the efficiency is high, the positive voltage and the negative voltage transmitted by the bidirectional Hall sensor acquisition circuit can be sampled by the positive voltage sampling circuit and the negative voltage sampling circuit respectively, the positive voltage signal and the negative voltage signal cannot be doped and interfered with each other, and burrs cannot be generated.
As shown in fig. 1, according to an embodiment of the present invention, the forward voltage sampling circuit is composed of a first diode D1, a first forward input resistor R1, a first backward input resistor R2, a voltage dividing resistor R3, a first negative feedback resistor R4, a first filter capacitor C1, a first feedback capacitor C2, a first output resistor R5, a first output voltage dividing resistor R6, and a first operational amplifier U1.
In the present embodiment, the anode of the first diode D1 is connected to the ground, and the cathode thereof is connected to the bidirectional hall sensor output terminal;
one end of a first forward input resistor R1 is connected with the output end of the bidirectional Hall sensor, and the other end of the first forward input resistor R1 is connected with the positive input end of a first operational amplifier U1;
one end of the divider resistor R3 is connected with the positive input end of the first operational amplifier U1, and the other end is connected with the ground wire;
one end of the first reverse input resistor R2 is connected with the ground wire, and the other end of the first reverse input resistor R2 is connected with the negative input end of the first operational amplifier U1;
one end of the first negative feedback resistor R4 is connected with the negative input end of the first operational amplifier U1, and the other end is connected with the output end of the first operational amplifier U1;
the first feedback capacitor C2 is connected in parallel with the first degeneration resistor R4;
one end of the first output resistor R5 is connected with the output end of the first operational amplifier U1, and the other end is connected with the first output divider resistor R6;
one end of the first output voltage-dividing resistor R6 is connected with the first output resistor R5, and the other end is connected with the ground wire;
the first filter capacitor C1 is connected in parallel with the first output voltage-dividing resistor R6;
each pin of the first operational amplifier U1 is connected to a first diode D1, a first forward input resistor R1, a first reverse input resistor R2, a voltage dividing resistor R3, a first negative feedback resistor R4, a first filter capacitor C1, a first feedback capacitor C2, a first output resistor R5, and a first output voltage dividing resistor R6.
In this embodiment, the first feedback capacitor C2 functions as a high frequency filter, and the first output voltage divider resistor R6 divides the output voltage proportionally and discharges the energy of the first filter capacitor C1.
As shown in fig. 1, according to an embodiment of the present invention, the negative voltage sampling circuit is composed of a second diode D2, a second positive input resistor R7, a second negative input resistor R8, a second negative feedback resistor R9, a second filter capacitor C3, a second feedback capacitor C4, a second output resistor R10, a second output voltage-dividing resistor R11, and a second operational amplifier U2.
In this embodiment, one end of the second forward input resistor R7 is connected to ground, and the other end is connected to the positive input end of the second operational amplifier U2;
one end of a second reverse input resistor R8 is connected with the output end of the bidirectional Hall sensor, and the other end of the second reverse input resistor R8 is connected with the negative input end of a second operational amplifier U2;
the anode of the second diode D2 is connected with one end of the second negative feedback resistor R9, and the cathode thereof is connected with the negative input end of the second operational amplifier U2;
one end of the second negative feedback resistor R9 is connected with the anode of the second diode D2, and the other end is connected with the output end of the second operational amplifier U2;
one end of a second feedback capacitor C4 is connected with the cathode of the second diode D2, and the other end of the second feedback capacitor C4 is connected with the output end of the second operational amplifier U2;
one end of the second output resistor R10 is connected with the output end of the second operational amplifier U2, and the other end is connected with the second output divider resistor R11;
one end of the second output voltage-dividing resistor R11 is connected with the second output resistor R10, and the other end is connected with the ground wire;
the second feedback capacitor C4 is connected in parallel with the second output voltage-dividing resistor R11;
each pin of the second operational amplifier U2 is connected to a second diode D2, a second forward input resistor R7, a second reverse input resistor R8, a second negative feedback resistor R9, a second filter capacitor C3, a second feedback capacitor C4, a second output resistor R10, and a second output voltage-dividing resistor R11.
In this embodiment, the second feedback capacitor C4 functions as a high frequency filter, and the second output voltage divider resistor R11 divides the output voltage proportionally and discharges the energy of the second filter capacitor C3.
According to the arrangement, the positive voltage sampling circuit and the negative voltage sampling circuit are simple in circuit structure arrangement, the positive voltage signal and the negative voltage signal can be sampled through simple circuit structure arrangement, the two signals cannot interfere with each other, and burrs cannot be generated in the signals. And because the bidirectional Hall sensor is respectively connected with the positive sampling circuit and the negative sampling circuit, the acquisition of bidirectional voltage signals can be realized by adopting a single bidirectional sensor device, and the acquisition function of the bidirectional voltage signals which can be acquired by utilizing complicated and various assembly structures in the prior art can be realized by adopting a simple circuit assembly structure.
Further, as can be seen from the above, the output voltage signal of the bidirectional hall sensor acquisition circuit is a positive voltage signal value and a negative voltage signal value, according to an embodiment of the present invention, the output voltage signal is a signal value of-5V to +5V, and the output voltage signals of the positive voltage sampling circuit and the negative voltage sampling circuit are both 0V to 5V signal values.
Furthermore, the input impedance of the positive voltage sampling circuit is in a high impedance state, and the input impedance of the negative voltage sampling circuit is in a high impedance state.
FIG. 2 schematically illustrates a graph of output characteristics of a bi-directional Hall sensor acquisition circuit, a positive voltage sampling circuit, and a negative voltage sampling circuit, according to one embodiment of the invention. As shown in fig. 2, when the output voltage signal of the bidirectional hall sensor acquisition circuit is 0 to +5V, the output voltage signal of the forward voltage sampling circuit is 0 to + 5V;
when the output voltage signal of the bidirectional Hall sensor acquisition circuit is a-5V-0 signal, the output voltage signal of the forward voltage sampling circuit is a 0V signal.
When the output voltage signal of the bidirectional Hall sensor acquisition circuit is a-5V-0 signal, the output voltage signal of the negative voltage sampling circuit is a 0 to +5V signal;
when the output voltage signal of the bidirectional Hall sensor acquisition circuit is 0-5V signal, the output voltage signal of the negative voltage sampling circuit is 0V signal.
According to the arrangement of the invention, the positive voltage sampling circuit and the negative voltage sampling circuit can accurately judge and identify the positive voltage and the negative voltage output by the bidirectional Hall sensor acquisition circuit, and can filter the non-corresponding voltage signals, namely, the positive voltage sampling circuit can filter the negative voltage signals (such as the voltage signals of-5V-0), and the negative voltage sampling circuit can filter the positive voltage signals (such as the voltage signals of 0 to + 5V) and acquire the corresponding voltage signals. Therefore, the sampling of the positive voltage and the negative voltage is accurate, no burr and interference are generated, the working efficiency is high, and the circuit structure is simple and reliable.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (9)
1. A positive and negative voltage sampling shunt circuit, comprising: the bidirectional Hall sensor comprises a bidirectional Hall sensor acquisition circuit, a positive voltage sampling circuit and a negative voltage sampling circuit;
the output end of the bidirectional Hall sensor acquisition circuit is connected with the forward voltage sampling circuit, and the forward voltage sampling circuit samples the forward voltage in the voltage output by the bidirectional Hall sensor acquisition circuit;
the output end of the bidirectional Hall sensor acquisition circuit is connected with the negative voltage sampling circuit, and the negative voltage sampling circuit samples the negative voltage in the voltage output by the bidirectional Hall sensor acquisition circuit.
2. The positive-negative voltage sampling shunt circuit according to claim 1, wherein the forward voltage sampling circuit is composed of a first diode D1, a first forward input resistor R1, a first reverse input resistor R2, a voltage dividing resistor R3, a first degeneration resistor R4, a first filter capacitor C1, a first feedback capacitor C2, a first output resistor R5, a first output voltage dividing resistor R6 and a first operational amplifier U1.
3. The positive-negative voltage sampling shunt circuit of claim 2, wherein the anode of the first diode D1 is connected to ground, and the cathode thereof is connected to the bidirectional hall sensor output terminal;
one end of the first forward input resistor R1 is connected with the output end of the bidirectional Hall sensor, and the other end of the first forward input resistor R1 is connected with the positive input end of the first operational amplifier U1;
one end of the divider resistor R3 is connected with the positive input end of the first operational amplifier U1, and the other end is connected with the ground wire;
one end of the first reverse input resistor R2 is connected with the ground wire, and the other end of the first reverse input resistor R2 is connected with the negative input end of the first operational amplifier U1;
one end of the first negative feedback resistor R4 is connected with the negative input end of the first operational amplifier U1, and the other end is connected with the output end of the first operational amplifier U1;
the first feedback capacitor C2 is connected in parallel with the first degeneration resistor R4;
one end of the first output resistor R5 is connected with the output end of the first operational amplifier U1, and the other end is connected with the first output divider resistor R6;
one end of the first output voltage-dividing resistor R6 is connected with the first output resistor R5, and the other end of the first output voltage-dividing resistor R6 is connected with the ground wire;
the first filter capacitor C1 is connected in parallel with the first output voltage-dividing resistor R6;
each pin of the first operational amplifier U1 is connected to the first diode D1, the first forward input resistor R1, the first reverse input resistor R2, the voltage dividing resistor R3, the first degeneration resistor R4, the first filter capacitor C1, the first feedback capacitor C2, the first output resistor R5, and the first output voltage dividing resistor R6, respectively.
4. The positive-negative voltage sampling shunt circuit according to claim 1, wherein the negative voltage sampling circuit is composed of a second diode D2, a second positive input resistor R7, a second reverse input resistor R8, a second negative feedback resistor R9, a second filter capacitor C3, a second feedback capacitor C4, a second output resistor R10, a second output voltage-dividing resistor R11 and a second operational amplifier U2.
5. The positive-negative voltage sampling shunt circuit according to claim 4, wherein one end of the second forward input resistor R7 is connected to ground, and the other end is connected to the positive input terminal of the second operational amplifier U2;
one end of the second reverse input resistor R8 is connected with the output end of the bidirectional Hall sensor, and the other end of the second reverse input resistor R8 is connected with the negative input end of the second operational amplifier U2;
the anode of the second diode D2 is connected to one end of the second degeneration resistor R9, and the cathode thereof is connected to the negative input terminal of the second operational amplifier U2;
one end of the second negative feedback resistor R9 is connected with the anode of the second diode D2, and the other end is connected with the output end of the second operational amplifier U2;
one end of the second feedback capacitor C4 is connected to the cathode of the second diode D2, and the other end is connected to the output end of the second operational amplifier U2;
one end of the second output resistor R10 is connected with the output end of the second operational amplifier U2, and the other end is connected with the second output divider resistor R11;
one end of the second output voltage-dividing resistor R11 is connected with the second output resistor R10, and the other end of the second output voltage-dividing resistor R11 is connected with the ground wire;
the second feedback capacitor C4 is connected in parallel with the second output voltage-dividing resistor R11;
each pin of the second operational amplifier U2 is connected to the second diode D2, the second forward input resistor R7, the second reverse input resistor R8, the second degeneration resistor R9, the second filter capacitor C3, the second feedback capacitor C4, the second output resistor R10, and the second output voltage-dividing resistor R11.
6. The positive and negative voltage sampling shunt circuit of claim 1, wherein the bidirectional Hall sensor acquisition circuit outputs a positive and negative voltage signal value as well as a signal value of-5V to + 5V;
the output voltage signals of the positive voltage sampling circuit and the negative voltage sampling circuit are both 0-5V signal values.
7. The positive-negative voltage sampling shunt circuit of claim 1, wherein the forward voltage sampling circuit input impedance is in a high impedance state;
the input impedance of the negative voltage sampling circuit is in a high impedance state.
8. The positive and negative voltage sampling shunt circuit of claim 6, wherein when the bidirectional Hall sensor acquisition circuit outputs a voltage signal of 0 to +5V, the forward voltage sampling circuit outputs a voltage signal of 0 to + 5V;
when the output voltage signal of the bidirectional Hall sensor acquisition circuit is a-5V-0 signal, the output voltage signal of the forward voltage sampling circuit is a 0V signal.
9. The positive and negative voltage sampling shunt circuit of claim 6, wherein when the bidirectional Hall sensor acquisition circuit outputs a voltage signal of-5V to 0V, the negative voltage sampling circuit outputs a voltage signal of 0 to + 5V;
when the output voltage signal of the bidirectional Hall sensor acquisition circuit is a 0-5V signal, the output voltage signal of the negative voltage sampling circuit is a 0V signal.
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| CN202010918311.1A CN111812387B (en) | 2020-09-04 | 2020-09-04 | Positive and negative voltage sampling shunt circuit |
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| CN202010918311.1A CN111812387B (en) | 2020-09-04 | 2020-09-04 | Positive and negative voltage sampling shunt circuit |
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| CN111812387B (en) | 2021-02-05 |
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