CN214585680U - Differential type voltage division warning circuit - Google Patents
Differential type voltage division warning circuit Download PDFInfo
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- CN214585680U CN214585680U CN202120412695.XU CN202120412695U CN214585680U CN 214585680 U CN214585680 U CN 214585680U CN 202120412695 U CN202120412695 U CN 202120412695U CN 214585680 U CN214585680 U CN 214585680U
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Abstract
The utility model relates to a poor formula partial pressure warning circuit. The differential voltage division warning circuit comprises a power supply, a voltage division circuit, a differential amplification circuit and a voltage comparison circuit; the power supply is respectively connected with the voltage division circuit, the differential amplification circuit and the voltage comparison circuit, the voltage division circuit and the differential amplification circuit are respectively connected with the voltage comparison circuit, and the differential amplification circuit adopts a double-input single-output differential amplifier. The differential voltage division warning circuit combines the situation that the electrical measurement field detection amount is large, the detection means is single, and the actual detection considers that the measurement result caused by personal safety factors is not matched with the actual requirement to cause time waste, and provides a rough voltage amount for input to be fed back, so that a measurer can very intuitively check the circuit with the measured size.
Description
Technical Field
The utility model provides a poor formula partial pressure warning circuit relates to electric power system electrical measurement technical field, is particularly useful for the occasion that needs carry out rough estimation and convenient judgement to voltage input.
Background
Multimeters, ohmmeters, ammeters and voltmeters are widely applied to the field of electrical measurement, and are also necessary test instrument and equipment commonly used in electrical engineering and automation major. The conventional laboratory uses a multimeter, ohmmeter, ammeter or voltmeter having a separate body and measuring pen. In single-actual work, due to actual needs on site, the operator has a situation of roughly and estimating the measured electrical quantity. The traditional measurement method often cannot fulfill the requirement due to the limitation of too high application range and precision. The technology of roughly measuring two-point voltages and realizing intuitive feedback is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to solving the above-described problems. An object of the utility model is to provide a differential partial pressure warning circuit who solves above problem. Specifically, the utility model aims to combine that the electrical measurement field test volume is big, the detection means is single, actual detection considers that the measuring result that the personal safety factor leads to and actual need does not match the condition that leads to the waste of time, proposes a roughly voltage magnitude to the input and feeds back for survey crew can look over the circuit of measurand size very directly perceivedly. Compared with the traditional mode, the circuit design is very concise.
The utility model adopts the technical scheme that: a differential voltage division warning circuit comprises a power supply, a voltage division circuit, a differential amplification circuit and a voltage comparison circuit; the power supply is respectively connected with the voltage division circuit, the differential amplification circuit and the voltage comparison circuit, the voltage division circuit and the differential amplification circuit are respectively connected with the voltage comparison circuit, and the differential amplification circuit adopts a double-input single-output differential amplifier.
Furthermore, the differential amplification circuit adopts a monostable operational amplification chip; the voltage division circuit is formed by series resistors.
Further, the power supply is used for supplying power;
the voltage division circuit is used for distributing reference voltage and inputting the reference voltage to the voltage comparison circuit;
the differential amplification circuit is used for inputting the voltage between two points, amplifying and outputting the voltage to the voltage comparison circuit;
the voltage comparison circuit is used for comparing the reference voltage with the input signal amplified by the differential amplification circuit and outputting a light alarm signal.
Further, for millivolt-level electrical quantity measurement between two points, the voltage quantity between the two points is used as the input of a differential amplification circuit with double input and single output, after a common-mode signal is inhibited by the differential amplification circuit to amplify a differential-mode signal, the differential-mode signal is amplified by a specified multiple and is used as the output of the differential amplification circuit, the output end of the differential amplification circuit is connected in parallel with n monostable operational amplification chips, namely n voltage comparison circuits, and the reference voltage distributed by a voltage division circuit formed by series resistors is input to the other input end of the n operational amplification chips; the operational amplification chip working in a monostable state is used as a voltage comparator, compares reference voltage with an input signal amplified by the differential amplification circuit, and outputs a result in a high level mode and a low level mode to serve as a basis for the light emitting diode electronic element to output a light signal.
The utility model has the advantages that: the utility model discloses an electrical measurement technique, sound-light signal is opened. The user can quickly identify the magnitude of the input voltage and estimate and judge when the circuit inputs the voltage difference. The utility model discloses combine the voltage comparison circuit of difference amplifier circuit, monostable mode, series resistance's ladder bleeder circuit to the realization is to input voltage's quick estimate and judgement, and the interference killing feature is especially outstanding, reaches 99.611% to the ambient noise's under the 100dB intensity elimination rate. When a user uses the circuit to roughly measure the voltage, the average time of 11.21s can be saved under a typical working scene, the average labor efficiency is improved to 136%, and the circuit has the advantages of simplicity, directness, convenience and strong relativity.
Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 schematically illustrates a functional and logical block diagram of a differential voltage division alarm circuit according to the present invention;
fig. 2 schematically shows a typical design structure of the differential voltage division warning circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The following describes in detail the differential voltage division warning circuit according to the present invention with reference to the accompanying drawings.
Example 1: as shown in fig. 1-2, a differential voltage-dividing alarm circuit includes a power supply, a voltage-dividing circuit, a differential amplifying circuit, and a voltage comparing circuit; the power supply is respectively connected with the voltage division circuit, the differential amplification circuit and the voltage comparison circuit, the voltage division circuit and the differential amplification circuit are respectively connected with the voltage comparison circuit, and the differential amplification circuit adopts a double-input single-output differential amplifier.
Furthermore, the differential amplification circuit adopts a monostable operational amplification chip; the voltage division circuit is formed by series resistors.
Further, the power supply is used for supplying power;
the voltage division circuit is used for distributing reference voltage and inputting the reference voltage to the voltage comparison circuit;
the differential amplification circuit is used for inputting the voltage between two points, amplifying and outputting the voltage to the voltage comparison circuit;
the voltage comparison circuit is used for comparing the reference voltage with the input signal amplified by the differential amplification circuit and outputting a light alarm signal.
Further, for millivolt-level electrical quantity measurement between two points, the voltage quantity between the two points is used as the input of a differential amplification circuit with double input and single output, after a common-mode signal is inhibited by the differential amplification circuit to amplify a differential-mode signal, the differential-mode signal is amplified by a specified multiple and is used as the output of the differential amplification circuit, the output end of the differential amplification circuit is connected in parallel with n monostable operational amplification chips, namely n voltage comparison circuits, and the reference voltage distributed by a voltage division circuit formed by series resistors is input to the other input end of the n operational amplification chips; the operational amplification chip working in a monostable state is used as a voltage comparator, compares reference voltage with an input signal amplified by the differential amplification circuit, and outputs a result in a high level mode and a low level mode to serve as a basis for the light emitting diode electronic element to output a light signal.
The utility model discloses a theory of operation is:
for millivolt-level electric quantity measurement between two points, a differential amplifying circuit is adopted to amplify the differential quantity of input quantity, and a voltage comparison circuit is combined to distinguish the amplified electric quantity. The voltage between two points is used as the input of a differential amplifying circuit with double input and single output, after a differential mode signal is amplified by inhibiting a common mode signal through the differential amplifying circuit, the differential mode signal is amplified by a designated multiple and is used as the output of the differential amplifying circuit. The output end of the operational amplifier is connected with n operational amplifier chips which work in a monostable state in parallel, and the reference voltage distributed by a voltage division circuit formed by series resistors is input to the other input end of the n operational amplifier chips. The operational amplifier chip working in monostable state is used as a voltage comparator to compare the reference voltage with the amplified input signal, and the result is output in two forms of high level and low level to be used as the basis for electronic elements such as light emitting diodes to output light signals. As shown in fig. 1.
Referring to fig. 2, a typical design of a differential voltage divider alarm circuit is shown. In the figure, a module 1 in a black thick frame is a differential amplification circuit, and a pair of differential signals are input into an input 1 and an input 2 of the input end of the differential amplification circuit and enter the differential amplification circuit with double-end input and single-end output; the output OA of the differential amplifier circuit is connected to "node a 2"; the VCC end of an operational amplifier chip OPA2107AU selected in the differential amplification circuit is connected to a node A3 and then is connected to a power supply plus end of a module 3; the VSS terminal is connected to node A4, and then connected to the power-terminal of module 3. Node A1 of module 1 is connected to power 0 of module 3.
IN the figure, "module 21", "module 22" and "module 23" IN the black bold frame are three voltage comparison circuits with the same connection mode, taking "module 21" as an example, and "node 21A" and "node 22A" as input terminals, and are respectively connected to "IN-" and "IN +" terminals of the voltage comparison chip U2 (taking UA741CDT as an example IN the schematic diagram). The output end OUT of the voltage comparison chip U2 is connected to the anode of the light emitting diode D9, the cathode of the light emitting diode D9 is connected to the node 21E, and finally connected to the power supply 0 end of the module 3. The VSS terminal of U2 is connected to the "power-" pole of "module 3" via "node 21C"; the VCC terminal of U2 is connected to the "power supply +" pole of "module 3" via "node 21D".
In the figure, a black thick frame inner module 3 is a voltage division circuit and a power supply; the voltage of power supply- 'and power supply 0' is 6V, the voltage of power supply + 'and power supply 0' is 6V, and the voltage of power supply- 'and power supply +' is 12V; the output end node C21 of the voltage division circuit is connected with the input end node 21B of the voltage comparison circuit, and the output end node C22 of the voltage division circuit is connected with the input end node 22B of the voltage comparison circuit. One end of the series resistance voltage division circuit is connected with a port power supply 0, and the other end of the series resistance voltage division circuit is connected with a node C1 and a power supply plus.
Referring to fig. 2, a typical design of a differential voltage divider alarm circuit is shown. When the circuit is used, the on-off switch is firstly switched on, and the circuit starts to work normally.
In the figure, "block 1" in a black thick frame is a differential amplifier circuit. A pair of differential signals are input into input ends input 1 and input 2 of the differential amplifier circuit and enter a differential amplifier circuit with double ends input and single ends output. The amplification circuit in the schematic diagram has a magnification of 10 times.
When a pair of sinusoidal alternating current signals with a difference of 10mV and a same frequency of 50Hz are input at the input end, the sinusoidal alternating current signals with an assignment of 100mV and a frequency of 50Hz are obtained after the differential signals are amplified by 10 times through a differential amplification circuit.
The signal is connected from the output terminal OA of the differential amplifier circuit to "node a 2", and enters the port "node 21A" of "module 21", and is input to the input terminal "IN-" of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). And the divided voltage of 30mV, which is provided by the node C21 of the module 3, is used as a reference voltage and is input to the input terminal IN +' of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). Because the input signal 100mV is greater than the reference voltage 31mV, the operational amplifier chip (UA 741CDT is taken as an example in the figure) will output a square wave ac signal with 50Hz and 0V-6V assignment, so that the led D9 will flash continuously.
The signal is connected to "node a 2" from the output OA of the differential amplifier circuit, and also enters the port "node 22A" of "module 22", and is input to the input "IN-" of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). And the divided voltage of 120mV, which is provided by the node C22 of the module 3, is used as a reference voltage and is input to the input terminal IN + "of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). Because the input signal 100mV is less than the reference voltage 120mV, the operational amplifier chip (UA 741CDT is taken as an example in the figure) will output square wave AC signal with 50Hz and assigned value of 0V-6V, and the LED D10 will not flicker.
The user can judge that the measured voltage is in the range of 3mV-12mV, thus achieving the purpose of rough measurement.
When a pair of sinusoidal alternating current signals with 20mV difference and 50Hz frequency are input at the input end, the sinusoidal alternating current signals with 200mV assignment and 50Hz frequency are obtained after the differential signals are amplified by 10 times through a differential amplification circuit.
The signal is connected from the output terminal OA of the differential amplifier circuit to "node a 2", and enters the port "node 21A" of "module 21", and is input to the input terminal "IN-" of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). And the divided voltage of 30mV, which is provided by the node C21 of the module 3, is used as a reference voltage and is input to the input terminal IN +' of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). Because the input signal 200mV is greater than the reference voltage 31mV, the operational amplifier chip (UA 741CDT is taken as an example in the figure) will output a square wave ac signal with 50Hz and 0V-6V assignment, so that the led D9 will flash continuously.
The signal is connected to "node a 2" from the output OA of the differential amplifier circuit, and also enters the port "node 22A" of "module 22", and is input to the input "IN-" of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). And the divided voltage of 120mV, which is provided by the node C22 of the module 3, is used as a reference voltage and is input to the input terminal IN + "of the operational amplifier chip (UA 741CDT is taken as an example IN the figure). Because the input signal 200mV is greater than the reference voltage 120mV, the operational amplifier chip (UA 741CDT is taken as an example in the figure) will output a square wave ac signal with 50Hz and 0V-6V assignment, so that the led D10 will flash continuously.
The user can judge that the measured voltage is more than 12mV, thus achieving the purpose of rough measurement.
The utility model discloses has expansibility. The voltage divider circuit of "module 3" can output more voltages with different assignments, such as (reference voltage n) of fig. 1. In the voltage comparison circuit 4 (formed by the monostable operational amplifier chip) in fig. 1, (the reference voltage n) can be compared with any input signal in the same way, so that the expansion of the measurement range of the circuit is realized.
The utility model discloses a voltage measurement is measured, light signal is given first place to. The circuit is provided with a pair of input ends (input 1) and (input 2) as voltage input ends, and the functions of estimating voltage difference and comparing the voltage difference when the two input ends have voltage difference can be realized.
When the input ends (input 1) and (input 2) have voltage difference ranging from 500mV to 10mV, the quantity of the LED lamps with different quantities can be lightened at the output end, so that the judgment and the estimation are convenient.
The circuit adopts two input ends to form a differential amplification circuit, the output end is connected with a plurality of monostable working voltage comparison chips in parallel, and a voltage division circuit formed by series resistors is input at the other input end of the voltage comparison chips for voltage division. The circuit can determine at least 2 input range voltage assignments. The circuit can be expanded according to needs, and the judgment range can be adjusted.
The above-described embodiments can be implemented individually or in various combinations, and such variations are within the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above embodiments are merely for illustrating the technical solutions of the present invention and are not to be construed as limiting, and the present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all the modifications and equivalents should be covered by the scope of the claims of the present invention.
Claims (4)
1. A differential voltage division warning circuit is characterized in that: the voltage divider comprises a power supply, a voltage dividing circuit, a differential amplifying circuit and a voltage comparison circuit; the power supply is respectively connected with the voltage division circuit, the differential amplification circuit and the voltage comparison circuit, the voltage division circuit and the differential amplification circuit are respectively connected with the voltage comparison circuit, and the differential amplification circuit adopts a double-input single-output differential amplifier.
2. The differential voltage division alarm circuit of claim 1, wherein:
the differential amplification circuit adopts a monostable operational amplification chip; the voltage division circuit is formed by series resistors.
3. The differential voltage division alarm circuit of claim 1, wherein:
the power supply is used for supplying power;
the voltage division circuit is used for distributing reference voltage and inputting the reference voltage to the voltage comparison circuit;
the differential amplification circuit is used for inputting the voltage between two points, amplifying and outputting the voltage to the voltage comparison circuit;
the voltage comparison circuit is used for comparing the reference voltage with the input signal amplified by the differential amplification circuit and outputting a light alarm signal.
4. The differential voltage division alarm circuit of claim 1, wherein: for millivolt-level electrical quantity measurement between two points, the voltage quantity between the two points is used as the input of a differential amplification circuit with double input and single output, after a differential mode signal is amplified by inhibiting a common mode signal through the differential amplification circuit, the differential mode signal is amplified by a specified multiple and is used as the output of the differential amplification circuit, the output end of the differential amplification circuit is connected with n operational amplification chips which work in a monostable state in parallel, namely, n voltage comparison circuits are connected in parallel, and the reference voltage distributed by a voltage division circuit formed by series resistors is input to the other input end of the n operational amplification chips; the operational amplification chip working in a monostable state is used as a voltage comparator, compares reference voltage with an input signal amplified by the differential amplification circuit, and outputs a result in a high level mode and a low level mode to serve as a basis for the light emitting diode electronic element to output a light signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120412695.XU CN214585680U (en) | 2021-02-24 | 2021-02-24 | Differential type voltage division warning circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120412695.XU CN214585680U (en) | 2021-02-24 | 2021-02-24 | Differential type voltage division warning circuit |
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| CN214585680U true CN214585680U (en) | 2021-11-02 |
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| CN202120412695.XU Active CN214585680U (en) | 2021-02-24 | 2021-02-24 | Differential type voltage division warning circuit |
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- 2021-02-24 CN CN202120412695.XU patent/CN214585680U/en active Active
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