CN218727580U - Improved voltage sensor measuring circuit - Google Patents
Improved voltage sensor measuring circuit Download PDFInfo
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- CN218727580U CN218727580U CN202222486760.0U CN202222486760U CN218727580U CN 218727580 U CN218727580 U CN 218727580U CN 202222486760 U CN202222486760 U CN 202222486760U CN 218727580 U CN218727580 U CN 218727580U
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- 238000005259 measurement Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 9
- 239000003985 ceramic capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model relates to a modified voltage sensor measuring circuit, including hall sensor, supply circuit, input bleeder circuit, voltage-controlled constant current source circuit and sensor primary circuit. The utility model discloses a to the connection diagram of recommending among the LV-25-P SP5 voltage sensor data manual of LEM company production improve, former circuit primary circuit resistance consumed power is great, is difficult to install on the PCB board. The utility model has the advantages that, having designed a modified voltage sensor's isolated voltage measurement circuit, increased resistance in the sensor primary circuit, finally reduced the power consumption on the operational amplifier effectively, gained better effect.
Description
Technical Field
The utility model relates to an electrical parameter measures technical field, specifically is a modified voltage sensor measuring circuit.
Background
An LV-25-P/SP5 voltage sensor produced by an LEM company is selected to realize a sampling function, and the sensor has the advantages of high measurement accuracy, very good linearity, high bandwidth, low impedance, low distortion, high isolation voltage (4.2 kV), small volume and the like. The measurement range is 10V-1500V. As shown by the connection diagram recommended in the sensor data manual, for which the current is proportional to the measured voltage, it must be measured through an external resistor R1. Resistor R1 is selected by the user and installed on the primary circuit in series with the sensor and requires that the current of the sensor primary circuit be Ip =10mA at the nominal voltage; from the above, when the rated voltage VPN =1500V, the primary circuit total resistance
RPT = VPN/IP =150k Ω, and the primary resistance RP =300 Ω of the known sensor, so that the resistance R1= RPT-RP =149.7k Ω, and the power P = IP2R1=15W calculated on the resistance R1, the power is large, and the circuit is difficult to mount on a PCB board, so that the power consumption can be reduced by designing a circuit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a modified voltage sensor measuring circuit to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: an improved voltage sensor measuring circuit comprises a Hall sensor, a power supply circuit, an input voltage division circuit, a voltage-controlled constant current source circuit and a sensor primary loop circuit. The power supply circuit is provided with a +/-15V power supply which refers to 0V voltage, wherein the +15V is connected with a pin 7 of the operational amplifier, the-15V is connected with a pin 4 of the operational amplifier, and the 0V is connected with one end of each of the resistors R4 and R6; a capacitor C1 is arranged between the pin 7 of the operational amplifier and 0V, and a capacitor C2 is arranged between the pin 4 of the operational amplifier and 0V. The capacitors C1 and C2 are both multilayer ceramic capacitors with the capacity of 100 nF.
As a preferred technical solution of the present invention, in the voltage dividing circuit, the resistor R1 is formed by serially connecting a plurality of resistors; under the condition of rated voltage input, the voltage divided by the resistor R4 is 1V; under the rated voltage of 1500V, the resistance R1 takes the value of 2.21M omega, and the resistance R4 takes the value of 1.47k omega.
As an optimal technical scheme of the utility model, voltage-controlled constant current source circuit chooses for use the gain bandwidth to be greater than 14MHz, 10V step response is less than 1.1 mus, the output short-circuit current is greater than 25 mA's operational amplifier, and its model is OPA189ID, is connected through resistance R2 and resistance R4's one end, connects operational amplifier's negative input end and 0V through resistance R6.
As a preferred technical solution of the present invention, the primary loop of the sensor is connected to the pin 6 of the operational amplifier and the primary positive terminal of the voltage sensor through a resistor R3; the resistor R5 is connected with the primary negative end of the voltage sensor, and the other end of the resistor R5 is connected with the resistor R6. And the resistors R3 and R5 in the primary loop of the sensor are both 270 omega.
Compared with the prior art, the beneficial effects of the utility model are that: and the resistance is added in the primary loop of the sensor, so that the power consumption on the operational amplifier is effectively reduced finally, and a better effect is achieved.
Drawings
FIG. 1 shows the primary circuit of LV-25-P/SP5 voltage sensor
FIG. 2 is a modified sensor primary circuit
Detailed Description
Example 1
The utility model discloses an improved voltage sensor measuring circuit, U1 selects operational amplifier model OPA189ID, the gain bandwidth of the operational amplifier is 14MHz, the short circuit output current Isc = +/-65 mA; in the circuit, the power supply voltage V + =15V, V- = -15V of the primary power supply circuit, and the reference potential of 0V is provided. The values of the resistors R1 and R4 are related to the rated voltage, and when the input voltage is the rated voltage, the voltage obtained by dividing the resistor R4 is 1V; the value of the resistor R1 is far larger than that of the resistor R4. In order to improve the accuracy, R1 and R4 adopt low-temperature-drift precision resistors with the accuracy better than 0.5 percent; the value of R6 in the circuit enables the current of a primary loop to be 10mA under the rated voltage; selecting a low-temperature-drift precision resistor with the precision of 100 omega being better than 0.5 percent; the values of the resistors R3 and R5 in the circuit are 270 omega, and the precision of the two resistors does not influence the measurement result of the sensor; the capacitors C1 and C6 are power supply decoupling filter capacitors, and multilayer ceramic capacitors are selected, wherein the power supply decoupling filter capacitors are both 100nF;
as shown in fig. 2, the resistance of the resistor R1 is 2.21M Ω, the resistance of the resistor R4 is 1.47k Ω, the input voltage is divided by the resistor R1 and the resistor R4, and the voltage on the resistor R4 is
V 1 ＝V H *R 4 /(R 1 +R 4 ) (ii) a Since the input impedance of the operational amplifier is infinite, the voltage at pin 3 is equal to the voltage at pin R4, V IN+ ＝V 1 Then, based on the virtual short principle of operational amplifier,the voltage of the 2 nd pin of the operational amplifier is equal to the voltage of the 3 rd pin, namely V IN+ ＝V IN- From this, the current on the resistor R6 is I P ＝V IN- /R 6 (ii) a This current is the sensor primary loop current.
Resistors R3 and R5 are added in a primary loop of the sensor, and the function of the resistors is to reduce the power consumption of the operational amplifier; neglecting the static power consumption of the operational amplifier, the total power consumed by the primary loop is P op ＝I P *(V + -V R3 -V R5 -V R6 -V SENSOR ) (ii) a Because the resistance value of R1 can be very large, the current and the power of a primary circuit can be greatly reduced; as known from the data sheet of the sensor, the primary-secondary current ratio of the sensor is 1:2.5, so that resistance RM current
I M ＝2.5I p ＝2.5*V IN- /R 6 ＝2.5*V H *R 4 /[R 6 *(R 1 +R 4 )]。
It can be seen that IM is proportional to the measured voltage VH, and therefore, the magnitude of the measured voltage VH can be obtained by measuring the voltage or current on RM.
Substituting the numerical values of the elements in the figure 2 into the formula to obtain
I M ＝0.01662*V H (mA)；
P op And =1.02+0.15=1.17W, and the improved total power consumption is 7.8% of the original circuit.
In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore are not to be construed as limiting the present invention, and further, the terms "first", "second", and the like are used only for descriptive purposes and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features being referred to, whereby the features defined as "first", "second", and the like may explicitly or implicitly include one or more such features, and in the description of the present invention, unless otherwise indicated, the terms "plurality" means two or more than two.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be a communication between the two elements, and the specific meaning of the above terms in the present invention can be understood by those skilled in the art through the specific situation
Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge range of those skilled in the art, and modifications or variations without creative efforts are still within the scope of the present invention.
Claims (8)
1. An improved voltage sensor measurement circuit, characterized by: the sensor comprises a Hall sensor, a power supply circuit, an input voltage division circuit, a voltage-controlled constant current source circuit and a sensor primary loop circuit.
2. An improved voltage sensor measurement circuit as claimed in claim 1, wherein: the power supply circuit is provided with a +/-15V power supply which refers to 0V voltage, wherein the +15V power supply is connected with a pin 7 of the operational amplifier, the-15V power supply is connected with a pin 4 of the operational amplifier, and the 0V power supply is connected with one end of each of the resistors R4 and R6; a capacitor C1 is arranged between the pin 7 of the operational amplifier and 0V, and a capacitor C2 is arranged between the pin 4 of the operational amplifier and 0V.
3. An improved voltage sensor measurement circuit as claimed in claim 2, wherein: the capacitors C1 and C2 are both multilayer ceramic capacitors with a capacity of 100 nF.
4. An improved voltage sensor measurement circuit as claimed in claim 1, wherein: in the voltage division circuit, a resistor R1 is formed by connecting a plurality of resistors in series; under the condition of rated voltage input, the voltage divided by the resistor R4 is 1V; under the rated voltage of 1500V, the resistance R1 takes the value of 2.21M omega, and the resistance R4 takes the value of 1.47k omega.
5. An improved voltage sensor measurement circuit as claimed in claim 1, wherein: the voltage-controlled constant current source circuit is an operational amplifier with a gain bandwidth larger than 14MHz, a 10V step response smaller than 1.1 mu s and an output short-circuit current larger than +/-25 mA.
6. An improved voltage sensor measurement circuit as claimed in claim 5, wherein: the voltage-controlled constant current source circuit selects an operational amplifier with the model number of OPA189ID, is connected with one end of a resistor R4 through a resistor R2, and is connected with the negative input end of the operational amplifier and 0V through a resistor R6.
7. An improved voltage sensor measurement circuit as claimed in claim 1, wherein: the primary loop of the sensor is connected with a pin 6 of the operational amplifier and the primary positive end of the voltage sensor through a resistor R3; the resistor R5 is connected with the primary negative end of the voltage sensor, and the other end of the resistor R5 is connected with the resistor R6.
8. An improved voltage sensor measurement circuit as claimed in claim 6, wherein: and the resistors R3 and R5 in the primary loop of the sensor are both 270 omega.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222486760.0U CN218727580U (en) | 2022-09-20 | 2022-09-20 | Improved voltage sensor measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222486760.0U CN218727580U (en) | 2022-09-20 | 2022-09-20 | Improved voltage sensor measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218727580U true CN218727580U (en) | 2023-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222486760.0U Active CN218727580U (en) | 2022-09-20 | 2022-09-20 | Improved voltage sensor measuring circuit |
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| CN (1) | CN218727580U (en) |
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- 2022-09-20 CN CN202222486760.0U patent/CN218727580U/en active Active
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