CN221961719U - Accurate power drive circuit of electromagnetic force sensor AD - Google Patents
Accurate power drive circuit of electromagnetic force sensor AD Download PDFInfo
- Publication number
- CN221961719U CN221961719U CN202323439779.0U CN202323439779U CN221961719U CN 221961719 U CN221961719 U CN 221961719U CN 202323439779 U CN202323439779 U CN 202323439779U CN 221961719 U CN221961719 U CN 221961719U
- Authority
- CN
- China
- Prior art keywords
- power supply
- amplifier
- pin
- resistor
- precision
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000005259 measurement Methods 0.000 abstract description 23
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005070 sampling Methods 0.000 description 6
- 238000005303 weighing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 1
- 101000827703 Homo sapiens Polyphosphoinositide phosphatase Proteins 0.000 description 1
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 1
- 102100023591 Polyphosphoinositide phosphatase Human genes 0.000 description 1
- 101100012902 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FIG2 gene Proteins 0.000 description 1
- 101100233916 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) KAR5 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
Abstract
Description
技术领域Technical Field
本实用新型属于测量技术领域，尤其涉及一种电磁力传感器AD的精密电源驱动电路。The utility model belongs to the field of measurement technology, and in particular relates to a precision power supply driving circuit of an electromagnetic force sensor AD.
背景技术Background Art
电子称重测量方法基本有两种测量方法，其中一种是变位法，即通过弹性元件的形变量来感知和确定被测物体重量的方法；另一种测重方法被称作零位法。通过已知重量来确定被测物体的重量的方法被称为零位法。There are basically two methods for electronic weighing measurement. One is the displacement method, which is a method of sensing and determining the weight of the object being measured by the deformation of the elastic element; the other weight measurement method is called the zero-position method. The method of determining the weight of the object being measured by a known weight is called the zero-position method.
电磁力电子天平测量原理是依据杠杆平衡原理，如图1，采用零位法时，杠杆一端是承载被测重物的托盘，另一端由通电线圈施加电磁力，通过测试通电线圈的电流大小，判断电磁力的大小，然后通过微机计算出被测物体重量。恒定磁场强度B，线圈的有效长度L，流过线圈中的电流I，线圈在磁场中受到的力F，存在计算公式为F＝BIL。M＝δF。式中，δ为平衡系统中恒定的比例因数，M为被测物质的质量。见图2，其控制流程图，线圈中的电流通过采样电阻R取出，进入AD转换器，由主MCU称重处理核心芯片处理后显示，键盘用于数据输入。见图3，为采样电阻R的原理示意图，其中磁场强度B为常量，线圈的有效长度L为常量，流过线圈中的电流I为变量，F与U呈线性关系，U只受R影响，则数据采集的精确度受到R及AD采集系统的影响。AD电压采集电路见图4，系统中模数转换器采用的是集成电路U1为CS5532BSZ，该电路是24位高精度模数转换器，它使用电荷平衡技术来实现24位性能。ADC经过优化，可测量秤重、过程控制、科学和医疗应用中的低电平单极或双极信号。24位高精度模数转换器CS5532BSZ将测量到的模拟信号转换为数字信号提供给主MCU。CS5532BSZ输出数据的温度稳定程度与其5脚、6脚输入的正负模拟电源及18脚、17脚输入的正负数字电源的温度稳定程度相关，与该电源配套的采样电路，见图5。为了保证CS5532BSZ具有在不同温度条件下具有精确的稳定输出，必须提供温度稳定性较高的供电驱动电压。The measurement principle of the electromagnetic force electronic balance is based on the lever balance principle, as shown in Figure 1. When the zero position method is used, one end of the lever is a tray that carries the weight to be measured, and the other end is applied with an electromagnetic force by an energized coil. By testing the current of the energized coil, the magnitude of the electromagnetic force is determined, and then the weight of the object to be measured is calculated by a microcomputer. The constant magnetic field strength B, the effective length L of the coil, the current I flowing through the coil, and the force F exerted on the coil in the magnetic field are calculated by the formula F = BIL. M = δF. In the formula, δ is a constant proportional factor in the balance system, and M is the mass of the measured substance. See Figure 2 for its control flow chart. The current in the coil is taken out through the sampling resistor R and enters the AD converter. It is processed by the main MCU weighing processing core chip and displayed. The keyboard is used for data input. See Figure 3 for the principle schematic diagram of the sampling resistor R, where the magnetic field strength B is a constant, the effective length L of the coil is a constant, the current I flowing through the coil is a variable, F is linearly related to U, and U is only affected by R. The accuracy of data acquisition is affected by R and the AD acquisition system. The AD voltage acquisition circuit is shown in Figure 4. The analog-to-digital converter in the system uses the integrated circuit U1, which is CS5532BSZ. This circuit is a 24-bit high-precision analog-to-digital converter that uses charge balancing technology to achieve 24-bit performance. The ADC is optimized to measure low-level unipolar or bipolar signals in weighing, process control, scientific and medical applications. The 24-bit high-precision analog-to-digital converter CS5532BSZ converts the measured analog signal into a digital signal and provides it to the main MCU. The temperature stability of the output data of the CS5532BSZ is related to the temperature stability of the positive and negative analog power supplies at its 5-pin and 6-pin inputs and the positive and negative digital power supplies at its 18-pin and 17-pin inputs. The sampling circuit supporting this power supply is shown in Figure 5. In order to ensure that the CS5532BSZ has accurate and stable output under different temperature conditions, a power supply drive voltage with high temperature stability must be provided.
在精密测量领域，对于不同的环境下测量的精确度要有较高的要求。而电子电路普遍存在温度漂移问题，即随着环境温度的变化，电子电路会受到较大的影响。尤其是作为测量基准的参考电压一旦随着环境温度发生变化，对于整个系统的测量精确度会有较大影响。从而使测量出来的重量出现较大误差，严重影响测量的精确度。因此必须解决测量电路的参考电压受到温度变化影响这个问题。In the field of precision measurement, there are high requirements for the accuracy of measurement in different environments. However, electronic circuits generally have the problem of temperature drift, that is, as the ambient temperature changes, the electronic circuits will be greatly affected. In particular, once the reference voltage used as the measurement basis changes with the ambient temperature, it will have a great impact on the measurement accuracy of the entire system. As a result, the measured weight will have a large error, seriously affecting the accuracy of the measurement. Therefore, it is necessary to solve the problem that the reference voltage of the measurement circuit is affected by temperature changes.
实用新型内容Utility Model Content
本实用新型的目的是提供一种电磁力传感器AD的精密电源驱动电路，克服现有技术的不足，可在不同温度下实现极高稳定度精密电源驱动电路，用于实现对测量系统的精密供电，解决测量系统的温度漂移问题，提高测量精度。The purpose of the utility model is to provide a precision power supply driving circuit for an electromagnetic force sensor AD, which overcomes the shortcomings of the prior art and can realize a very high stability precision power supply driving circuit at different temperatures, so as to realize precise power supply to the measurement system, solve the temperature drift problem of the measurement system, and improve the measurement accuracy.
为实现上述目的，本实用新型通过以下技术方案实现：To achieve the above purpose, the utility model is implemented through the following technical solutions:
一种电磁力传感器AD的精密电源驱动电路，其特征在于，包括放大器一U2A、放大器二U2B、三极管一Q3和三极管二Q4，放大器一U2A的1脚与三极管二Q4的基极相连接，三极管二Q4的集电极接电源系统正电源VCC，三极管二Q4的发射极分别连接电阻R1的一端和精密+2.5V电压输出端；放大器一U2A的4脚接电源系统负电源VEE；放大器一U2A的8脚接电源系统正电源VCC；放大器一U2A的2脚分别接电阻R1的另一端以及电阻R25的一端；放大器一U2A的3脚分别连接电阻R3的一端和电阻R7的一端，电阻R3的另一端连接精密电压基准源输出端VREF，电阻R7的另一端接地；放大器二U2B的7脚连接三极管一Q3的基极，三极管二Q3的集电极接电源系统负电源VEE，三极管二Q3的发射极分别连接电阻R2的一端和精密-2.5V电压输出端；放大器二U2B的5脚接地；放大器二U2B的6脚分别接电阻R2的另一端以及电阻R25的另一端。A precision power supply drive circuit for an electromagnetic force sensor AD, characterized in that it includes an amplifier U2A, an amplifier U2B, a transistor Q3 and a transistor Q4, wherein the 1st pin of the amplifier U2A is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the positive power supply VCC of the power supply system, and the emitter of the transistor Q4 is respectively connected to one end of the resistor R1 and the precision +2.5V voltage output end; the 4th pin of the amplifier U2A is connected to the negative power supply VEE of the power supply system; the 8th pin of the amplifier U2A is connected to the positive power supply VCC of the power supply system; the 2nd pin of the amplifier U2A is respectively connected to the other end of the resistor R1 end and one end of resistor R25; pin 3 of amplifier U2A is respectively connected to one end of resistor R3 and one end of resistor R7, the other end of resistor R3 is connected to the output end VREF of the precision voltage reference source, and the other end of resistor R7 is grounded; pin 7 of amplifier U2B is connected to the base of transistor Q3, the collector of transistor Q3 is connected to the negative power supply VEE of the power supply system, and the emitter of transistor Q3 is respectively connected to one end of resistor R2 and the precision -2.5V voltage output end; pin 5 of amplifier U2B is grounded; pin 6 of amplifier U2B is respectively connected to the other end of resistor R2 and the other end of resistor R25.
所述放大器一U2A和放大器二U2B所在芯片的型号为OPA2277US。The chip model of the amplifier 1 U2A and the amplifier 2 U2B is OPA2277US.
所述三极管一Q3为PNP型三极管，型号为BCW61C。The transistor Q3 is a PNP transistor, model BCW61C.
所述三极管二Q4为NPN型三极管，型号为BCW60C。The transistor Q4 is an NPN transistor, model BCW60C.
所述精密电压基准源输出端VREF和电阻R27的一端均连接于精密电压基准源U3的1脚，电阻R27的另一端分别连接精密电压基准源U3的3脚、电容C43的一端、电容C44的阳极和电源系统正电源VCC，精密电压基准源U3的2脚接地，精密电压基准源U3的4脚分别接电容C47的一端和电容C46的阴极，电容C47的另一端分别连接电容C43的另一端、电容C46的阳极、电容C44的阴极和地。The precision voltage reference source output terminal VREF and one end of the resistor R27 are both connected to pin 1 of the precision voltage reference source U3. The other end of the resistor R27 is respectively connected to pin 3 of the precision voltage reference source U3, one end of the capacitor C43, the anode of the capacitor C44 and the positive power supply VCC of the power supply system. Pin 2 of the precision voltage reference source U3 is grounded. Pin 4 of the precision voltage reference source U3 is respectively connected to one end of the capacitor C47 and the cathode of the capacitor C46. The other end of the capacitor C47 is respectively connected to the other end of the capacitor C43, the anode of the capacitor C46, the cathode of the capacitor C44 and the ground.
所述精密电压基准源U3的型号为LM399AH。所述地为电源地。The model of the precision voltage reference source U3 is LM399AH. The ground is a power ground.
与现有技术相比，本实用新型的有益效果是：可在不同温度下实现极高稳定度精密电源驱动电路，用于实现对测量系统的精密供电，解决测量系统的温度漂移问题，提高测量精度，改进后，大大改善了电源温度稳定性，减少了测量系统的温度漂移，最终实现了在不同温度下，产品的测量值的一致性。Compared with the prior art, the beneficial effects of the utility model are: it can realize extremely high stability precision power supply driving circuit at different temperatures, which is used to realize precise power supply to the measurement system, solve the temperature drift problem of the measurement system, and improve the measurement accuracy. After the improvement, the temperature stability of the power supply is greatly improved, the temperature drift of the measurement system is reduced, and finally the consistency of the measurement value of the product at different temperatures is achieved.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是现有技术中电磁力电子天平测量原理示意图；FIG1 is a schematic diagram of the measurement principle of an electromagnetic force electronic balance in the prior art;
图2是现有技术中电磁力电子天平测量系统控制流程图；FIG2 is a control flow chart of an electromagnetic force electronic balance measurement system in the prior art;
图3是现有技术中电磁力电子天平测量系统中采样原理示意图；FIG3 is a schematic diagram of the sampling principle in the electromagnetic force electronic balance measurement system in the prior art;
图4是现有技术中电磁力电子天平测量系统中AD电压采集电路示意图；FIG4 is a schematic diagram of an AD voltage acquisition circuit in an electromagnetic force electronic balance measurement system in the prior art;
图5是现有技术中采样电阻电路图；FIG5 is a circuit diagram of a sampling resistor in the prior art;
图6是本实用新型电磁力传感器AD的精密电源驱动电路实施例结构示意图；FIG6 is a schematic structural diagram of an embodiment of a precision power supply drive circuit of an electromagnetic force sensor AD of the present utility model;
图7是本实用新型实施例中精密电压基准源结构示意图。FIG. 7 is a schematic diagram of the structure of a precision voltage reference source in an embodiment of the utility model.
具体实施方式DETAILED DESCRIPTION
下面将结合具体实施例对本实用新型的技术方案进行清楚、完整地描述，显然，所描述的实施例是本实用新型一部分实施例，而不是全部的实施例。The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.
为了更清楚地说明本实用新型具体实施方式或现有技术中的技术方案，下面将对具体实施方式或现有技术描述中所需要使用的具体实施例作简单地介绍，显而易见地，下面描述中的具体实施例是本实用新型的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些具体实施例获得其他的具体实施例。In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.
通常在此处具体实施例中描述和显示出的本实用新型实施例的组件可以以无数种不同的配置来布置和设计。因此，以下对在具体实施例中提供的本实用新型的实施例的详细描述并非旨在限制要求保护的本实用新型的范围，而是仅仅表示本实用新型的选定实施例。The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.
见图6-7，是本实用新型一种电磁力传感器AD的精密电源驱动电路实施例结构示意图，是由运算放大器OPA2277US为核心的精密电源驱动电路，包括放大器一U2A、放大器二U2B、三极管一Q3和三极管二Q4，放大器一U2A和放大器二U2B是两个独立的运算放大器，放大器一U2A的1脚与三极管二Q4的基极相连接，三极管二Q4的集电极接电源系统正电源VCC，三极管二Q4的发射极分别连接电阻R1的一端和精密+2.5V电压输出端；放大器一U2A的4脚接电源系统负电源VEE；放大器一U2A的8脚接电源系统正电源VCC；放大器一U2A的2脚分别接电阻R1的另一端以及电阻R25的一端；放大器一U2A的3脚分别连接电阻R3的一端和电阻R7的一端，电阻R3的另一端连接精密电压基准源输出端VREF，电阻R7的另一端接地；放大器二U2B的7脚连接三极管一Q3的基极，三极管二Q3的集电极接电源系统负电源VEE，三极管二Q3的发射极分别连接电阻R2的一端和精密-2.5V电压输出端；放大器二U2B的5脚接地；放大器二U2B的6脚分别接电阻R2的另一端以及电阻R25的另一端。See Figures 6-7, which are schematic diagrams of the structure of an embodiment of a precision power drive circuit of an electromagnetic force sensor AD of the utility model. It is a precision power drive circuit with an operational amplifier OPA2277US as the core, including an amplifier U2A, an amplifier U2B, a transistor Q3 and a transistor Q4. The amplifier U2A and the amplifier U2B are two independent operational amplifiers. The 1st pin of the amplifier U2A is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the positive power supply VCC of the power supply system, and the emitter of the transistor Q4 is respectively connected to one end of the resistor R1 and the precision +2.5V voltage output terminal; the 4th pin of the amplifier U2A is connected to the negative power supply VEE of the power supply system; the amplifier U2A Pin 8 of amplifier U2A is connected to the positive power supply VCC of the power system; Pin 2 of amplifier U2A is connected to the other end of resistor R1 and one end of resistor R25 respectively; Pin 3 of amplifier U2A is connected to one end of resistor R3 and one end of resistor R7 respectively, the other end of resistor R3 is connected to the output terminal VREF of the precision voltage reference source, and the other end of resistor R7 is grounded; Pin 7 of amplifier U2B is connected to the base of transistor Q3, the collector of transistor Q3 is connected to the negative power supply VEE of the power system, and the emitter of transistor Q3 is connected to one end of resistor R2 and the precision -2.5V voltage output terminal respectively; Pin 5 of amplifier U2B is grounded; Pin 6 of amplifier U2B is connected to the other end of resistor R2 and the other end of resistor R25 respectively.
放大器一U2A和放大器二U2B所在芯片的型号为OPA2277US。三极管一Q3为PNP型三极管，型号为BCW61C。三极管二Q4为NPN型三极管，型号为BCW60C。The chip model of amplifier 1 U2A and amplifier 2 U2B is OPA2277US. Transistor 1 Q3 is a PNP transistor, model BCW61C. Transistor 2 Q4 is an NPN transistor, model BCW60C.
精密电压基准源输出端VREF电路由精密电压基准源U3即LM399AH为核心组成，精密电压基准源输出端VREF和电阻R27的一端均连接于精密电压基准源U3的1脚，电阻R27的另一端分别连接精密电压基准源U3的3脚、电容C43的一端、电容C44的阳极和电源系统正电源VCC，精密电压基准源U3的2脚接地，精密电压基准源U3的4脚分别接电容C47的一端和电容C46的阴极，电容C47的另一端分别连接电容C43的另一端、电容C46的阳极、电容C44的阴极和地。The precision voltage reference source output terminal VREF circuit is composed of the precision voltage reference source U3, namely LM399AH, as the core. The precision voltage reference source output terminal VREF and one end of the resistor R27 are both connected to pin 1 of the precision voltage reference source U3. The other end of the resistor R27 is respectively connected to pin 3 of the precision voltage reference source U3, one end of the capacitor C43, the anode of the capacitor C44 and the positive power supply VCC of the power supply system. Pin 2 of the precision voltage reference source U3 is grounded. Pin 4 of the precision voltage reference source U3 is respectively connected to one end of the capacitor C47 and the cathode of the capacitor C46. The other end of the capacitor C47 is respectively connected to the other end of the capacitor C43, the anode of the capacitor C46, the cathode of the capacitor C44 and the ground.
采样电阻R电路及24位模数转换电路见附图4、图5，为常规应用电路，为本专利电路的具体应用电路，不做详细描述。The sampling resistor R circuit and the 24-bit analog-to-digital conversion circuit are shown in Figures 4 and 5, which are conventional application circuits and specific application circuits of the patented circuit and will not be described in detail.
尽管已经示出和描述了本实用新型的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本实用新型的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本实用新型的范围由所附权利要求及其等同物限定。Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323439779.0U CN221961719U (en) | 2023-12-18 | 2023-12-18 | Accurate power drive circuit of electromagnetic force sensor AD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323439779.0U CN221961719U (en) | 2023-12-18 | 2023-12-18 | Accurate power drive circuit of electromagnetic force sensor AD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221961719U true CN221961719U (en) | 2024-11-05 |
Family
ID=93278048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323439779.0U Active CN221961719U (en) | 2023-12-18 | 2023-12-18 | Accurate power drive circuit of electromagnetic force sensor AD |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221961719U (en) |
-
2023
- 2023-12-18 CN CN202323439779.0U patent/CN221961719U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102052991B (en) | Method for setting temperature compensation coefficient of pressure sensor | |
| CN204855009U (en) | Temperature detection circuit based on platinum thermal resistance | |
| CN204302480U (en) | A kind of monolithic processor controlled teslameter | |
| CN222128058U (en) | Radio frequency microwave power level control device with temperature compensation | |
| CN107255529A (en) | A kind of temperature sensors of high precision | |
| CN103913249A (en) | Temperature monitoring circuit device and method | |
| CN221961719U (en) | Accurate power drive circuit of electromagnetic force sensor AD | |
| CN112098916A (en) | System and method for superposing ripples on direct current loop in direct current electric energy detection device | |
| CN219738060U (en) | uA level high-precision constant current source system | |
| CN118190228A (en) | Temperature compensation hardware circuit of water pressure sensor and control method thereof | |
| TWI235824B (en) | The temperature compensating method of a digital pressure gauge | |
| CN214041538U (en) | Current and voltage detection circuit based on single chip microcomputer | |
| CN110456144A (en) | A nA level current measurement system for testing equipment | |
| CN222599012U (en) | Testing device based on arm model heat flow | |
| CN112067889A (en) | Current measurement circuit and equipment applying same | |
| CN202255672U (en) | Temperature measuring system | |
| CN106289464A (en) | A kind of two-wire system faint strain bridge signal transmitting device | |
| CN115979403B (en) | Triode temperature compensation circuit | |
| CN110440945B (en) | High-precision low-temperature drift discrete type double-matching constant current source temperature measuring circuit | |
| CN210719389U (en) | High-precision low-ripple power supply circuit for weighing sensor in automatic quantitative scale | |
| CN206353049U (en) | A kind of intelligent electronic-scale system | |
| CN115597738A (en) | Driving system for improving linearity of alternating current micro-resistor measurement loop | |
| CN202330685U (en) | Device for calibrating electromotive force value of standard battery | |
| CN2577235Y (en) | High-precision gain-adjustable dynamic strain instrument | |
| CN206488792U (en) | A kind of high-precision single arm bridge circuit of sketch-based user interface method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |