CN107084750A - A real-time dynamic weight signal processing circuit module - Google Patents
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Abstract
本发明公开了一种实时动态重量信号处理电路模块。包括电源管理电路、信号放大电路、信号滤波电路、电压转电流电路和传感器激励电压电路；其中电源管理电路分别与信号放大电路、信号滤波电路、电压转电流电路和传感器激励电压电路相连接进行供电，信号放大电路、信号滤波电路、电压转电流电路顺次连接并作为传感器动态重量信号的通路。本发明能放大原始动态重量信号，消除扰动载荷信号，并将电压信号转换为电流信号，低通滤波的截止频率在3～300Hz范围内可调，能适用于不同重量设备及不同特性的重量对象。The invention discloses a real-time dynamic weight signal processing circuit module. Including power management circuit, signal amplification circuit, signal filter circuit, voltage-to-current circuit and sensor excitation voltage circuit; the power management circuit is connected with signal amplification circuit, signal filter circuit, voltage-to-current circuit and sensor excitation voltage circuit respectively for power supply , the signal amplifying circuit, the signal filtering circuit, and the voltage-to-current circuit are sequentially connected and used as a channel for the dynamic weight signal of the sensor. The invention can amplify the original dynamic weight signal, eliminate the disturbance load signal, and convert the voltage signal into a current signal. The cut-off frequency of the low-pass filter can be adjusted within the range of 3-300Hz, and can be applied to different weight equipment and weight objects with different characteristics. .
Description
技术领域technical field
本发明涉及一种信号处理电路模块，特别涉及了应用于工业现场的一种实时动态重量信号处理电路模块。The invention relates to a signal processing circuit module, in particular to a real-time dynamic weight signal processing circuit module applied to industrial sites.
背景技术Background technique
动态重量测试技术被广泛应用于工业现场产品检测和分选环节中。通常重量传感器被安装在传送带的某个固定位置，当被测物经过该位置时，传感器输出重量信号。在动态传送带系统中，当产品到达重量传感器时，由于要求产品动态重量计量的速度较快，产品重量加载在传感器上的时间很短(在几百毫秒以内)。另外由于传送带运行过程中的机械振动、产品翻滚振动等干扰因素的影响，真实的产品重量会被淹没在各种干扰载荷之中，给动态重量实现高精度测量造成很大困难。因此在外界随机干扰作用下，如何排除干扰载荷，准确测量被测物真实重量，是动态重量测试系统的技术难点和关键所在。Dynamic weight testing technology is widely used in the inspection and sorting of industrial field products. Usually the weight sensor is installed at a fixed position on the conveyor belt, and when the measured object passes through this position, the sensor outputs a weight signal. In the dynamic conveyor belt system, when the product arrives at the weight sensor, the time for the product weight to be loaded on the sensor is very short (within hundreds of milliseconds) due to the requirement of fast dynamic weight measurement of the product. In addition, due to the influence of interference factors such as mechanical vibration and product tumbling vibration during the operation of the conveyor belt, the real product weight will be submerged in various interference loads, which makes it very difficult to achieve high-precision measurement of dynamic weight. Therefore, under the action of external random interference, how to eliminate the interference load and accurately measure the real weight of the measured object is the technical difficulty and key point of the dynamic weight testing system.
目前，工业现场动态实时重量信号调理主要利用工业通用的电压信号调理电路来实现信号放大、滤波以及压流转换等功能。但是由于动态重量信号有保持时间短变化快的特点，在加上动态重量设备和重量对象的差异，现有的信号处理电路模块难以满足动态重量设备重量信号响应快，工况差异大的需求，无法实现高精度的动态重量。At present, the industrial field dynamic real-time weight signal conditioning mainly uses the industrial general voltage signal conditioning circuit to realize signal amplification, filtering and voltage-current conversion and other functions. However, because the dynamic weight signal has the characteristics of short holding time and fast change, coupled with the difference between the dynamic weight equipment and the weight object, the existing signal processing circuit module is difficult to meet the needs of the dynamic weight equipment with fast response to the weight signal and large differences in working conditions. High-precision dynamic weight cannot be achieved.
随着产品市场和工业现场的需求发展，迫切需要一种适用范围广，动态性能好的信号处理电路模块。With the development of product market and industrial site demand, there is an urgent need for a signal processing circuit module with a wide application range and good dynamic performance.
发明内容Contents of the invention
为了解决现有技术中存在的上述技术问题，本发明的目的在于提供一种实时动态重量信号处理电路模块，能够用于动态重量设备的信号处理，对动态重量信号进行调理，并且滤波器截止频率可调，解决工业现场动态重量精度低的问题。In order to solve the above-mentioned technical problems existing in the prior art, the object of the present invention is to provide a real-time dynamic weight signal processing circuit module, which can be used for signal processing of dynamic weight equipment, to condition the dynamic weight signal, and the filter cutoff frequency Adjustable to solve the problem of low dynamic weight accuracy in industrial sites.
为了实现上述目的，本发明采用的技术方案如下：In order to achieve the above object, the technical scheme adopted in the present invention is as follows:
本发明包括电源管理电路、信号放大电路、信号滤波电路、电压转电流电路和传感器激励电压电路；其中电源管理电路分别与信号放大电路、信号滤波电路、电压转电流电路和传感器激励电压电路相连接进行供电，信号放大电路、信号滤波电路、电压转电流电路顺次连接并作为传感器动态重量信号的通路。The present invention includes a power management circuit, a signal amplification circuit, a signal filter circuit, a voltage-to-current circuit and a sensor excitation voltage circuit; wherein the power management circuit is connected to the signal amplification circuit, the signal filter circuit, the voltage-to-current circuit and the sensor excitation voltage circuit respectively For power supply, the signal amplifier circuit, the signal filter circuit, and the voltage-to-current circuit are sequentially connected and used as a path for the dynamic weight signal of the sensor.
动态重量信号输入到信号放大电路放大，然后输入到信号滤波电路滤波，最后输入到电压转电流电路转化为电流的调理后的重量信号，传感器激励电压电路连接传感器用以驱动传感器。The dynamic weight signal is input to the signal amplification circuit for amplification, then input to the signal filter circuit for filtering, and finally input to the voltage-to-current circuit to convert the conditioned weight signal into the current, and the sensor excitation voltage circuit is connected to the sensor to drive the sensor.
所述电源管理电路包括电源接口CON1、电容C1～C14、电阻R1、二极管D1、发光二极管D2、24V转±15V电源转换模块U1以及稳压芯片U2～U5，电路经电源接口CON1接+24V供电，二极管D1的阳极接+24V电源正极，二极管D1的阴极经钽电容C1与模拟地(AGND)相连，二极管D1的阴极与24V转±15V电源转换模块U1的输入端VIN脚相连，二极管D1的阴极经电阻R1和发光二极管D2再接模拟地(AGND)；24V转±15V电源转换模块U1的电源输出端-VO和+VO脚分别输出-15V和+15V电源，并分别通过并联的电容C3、C4以及电容C5、C6接模拟地(AGND)；稳压芯片U2的输入端Vin脚接+15V电源，输出端Vout脚输出﹢12V电源，输出端Vout脚通过并联的电容C7和C8接模拟地(AGND)；稳压芯片U2输出的+12V电源接稳压芯片U4的5、7、8脚，稳压芯片U4的输出端1脚和2脚相连接并输出5V电源，并通过并联的电容C11和C12接模拟地(AGND)，同时稳压芯片U4的1脚和2脚通过电容C2连接到3脚，稳压芯片U4的4脚接模拟地(AGND)；稳压芯片U3的输入端Vin脚接-15V电源，稳压芯片U3的输出端Vout脚输出-12V电源并通过并联的电容C9和C10接模拟地(AGND)；稳压芯片U5的输入端Vin脚接-12V电源，U5的输出端Vout脚输出-5V电源并通过并联的电容C13和C14接模拟地(AGND)。The power management circuit includes power interface CON1, capacitors C1-C14, resistor R1, diode D1, light-emitting diode D2, 24V to ±15V power conversion module U1 and voltage stabilizing chips U2-U5, and the circuit is powered by +24V through the power interface CON1 , the anode of diode D1 is connected to the positive pole of +24V power supply, the cathode of diode D1 is connected to the analog ground (AGND) through tantalum capacitor C1, the cathode of diode D1 is connected to the input terminal VIN pin of 24V to ±15V power conversion module U1, the diode D1 The cathode is connected to the analog ground (AGND) through the resistor R1 and the light-emitting diode D2; the power output terminals -VO and +VO of the 24V to ±15V power conversion module U1 output -15V and +15V power respectively, and respectively pass through the parallel capacitor C3 , C4 and capacitors C5 and C6 are connected to analog ground (AGND); the input terminal Vin pin of voltage regulator chip U2 is connected to +15V power supply, the output terminal Vout pin outputs +12V power supply, and the output terminal Vout pin is connected to analog through parallel capacitors C7 and C8 Ground (AGND); the +12V power supply output by the voltage regulator chip U2 is connected to pins 5, 7, and 8 of the voltage regulator chip U4, and the output pins 1 and 2 of the voltage regulator chip U4 are connected to output 5V power, and through the Capacitors C11 and C12 are connected to analog ground (AGND), while pin 1 and pin 2 of voltage regulator chip U4 are connected to pin 3 through capacitor C2, and pin 4 of voltage regulator chip U4 is connected to analog ground (AGND); the input of voltage regulator chip U3 The terminal Vin pin is connected to the -15V power supply, the output terminal Vout pin of the voltage regulator chip U3 outputs -12V power supply and is connected to the analog ground (AGND) through the parallel capacitors C9 and C10; the input terminal Vin pin of the voltage regulator chip U5 is connected to the -12V power supply, The output terminal Vout pin of U5 outputs -5V power supply and connects to the analog ground (AGND) through the capacitors C13 and C14 connected in parallel.
所述的信号放大电路包括接口CON2和接口CON3、运算放大器芯片U6和U7、电位器VR1和VR2、电阻R2～R6和电容C15～C22，原始的动态重量信号由接口CON2接入电路，接口CON2的两个脚分别与运算放大器芯片U6的输入端5脚和4脚相连；运算放大器芯片U6的2脚依次经过电阻R2、电位器VR1和自身的15脚相连；运算放大器芯片U6的10脚接模拟地(AGND)，运算放大器芯片U6的电源引脚13脚和7脚分别接+12V和-12V电源，并分别经过并联的电容C15、C16以及电容C17、C18接模拟地(AGND)；运算放大器芯片U6的11脚和12脚相连，并经过电阻R5与运算放大器芯片U7的反向输入端2脚相连，运算放大器芯片U7的3脚经过电阻R6接模拟地(AGND)，运算放大器芯片U7的7脚和4脚分别接+12V和-12V电源，并分别经过并联电容C19、C20以及C21、C22接模拟地(AGND)；电阻R3的一端和电位器VR2的公共脚相连，电位器VR2两端分别连接模拟地(AGND)和+5V电源，电阻R3的另一端和运算放大器芯片U7的2脚相连，运算放大器芯片U7的2脚通过电阻R4和自身的6脚相连，运算放大器芯片U7的6脚作为信号放大电路的输出脚，通过与接口CON3相连输出放大后的信号，将输出信号连接至信号滤波电路。The signal amplifying circuit includes interfaces CON2 and CON3, operational amplifier chips U6 and U7, potentiometers VR1 and VR2, resistors R2-R6 and capacitors C15-C22, the original dynamic weight signal is connected to the circuit by the interface CON2, and the interface CON2 The two pins of the operational amplifier chip U6 are connected to the input terminal 5 pins and 4 pins respectively; the 2 pins of the operational amplifier chip U6 are connected to the 15 pins of itself through the resistor R2 and the potentiometer VR1 in turn; Analog ground (AGND), power supply pins 13 and 7 of the operational amplifier chip U6 are respectively connected to +12V and -12V power supplies, and connected to analog ground (AGND) through parallel capacitors C15, C16 and capacitors C17 and C18; The 11-pin and 12-pin of the amplifier chip U6 are connected, and connected with the reverse input terminal 2 pin of the operational amplifier chip U7 through the resistor R5, and the 3-pin of the operational amplifier chip U7 is connected to the analog ground (AGND) through the resistor R6, and the operational amplifier chip U7 Pin 7 and pin 4 are connected to +12V and -12V power supply respectively, and connected to analog ground (AGND) through parallel capacitors C19, C20, C21, C22 respectively; one end of resistor R3 is connected to the common pin of potentiometer VR2, and potentiometer VR2 The two ends are respectively connected to the analog ground (AGND) and +5V power supply, the other end of the resistor R3 is connected to the 2-pin of the operational amplifier chip U7, and the 2-pin of the operational amplifier chip U7 is connected to its own 6-pin through the resistor R4, and the operational amplifier chip U7 The pin 6 of the pin is used as the output pin of the signal amplification circuit, and the amplified signal is output by connecting with the interface CON3, and the output signal is connected to the signal filter circuit.
所述的信号滤波电路包括接口CON4、低通滤波器芯片U8、电阻R7和R8以及电容C23～C27，接口CON4的两端分别与低通滤波器芯片U8的Fout脚和模拟地(AGND)连接，低通滤波器芯片U8的CLKR脚、VCC-脚、AGND脚和VCC+脚为电源引脚，其中LS脚和VCC脚接-5V电源并经过并联的电容C24和C25接模拟地(AGND)，VCC+脚接+5V电源并经过并联的电容C26和C27接模拟地(AGND)，AGND脚接模拟地(AGND)；通滤波器芯片U8的CLKIN脚通过电容C23接数字地(DGND)，并通过电阻R8和电位器VR3和自身的CLKR脚连接，模拟地(AGND)和数字地(DGND)之间通过电阻R7相连接，低通滤波器芯片U8的Fin脚接来自信号放大电路的输出信号，经过低通滤波处理后在Fout脚输出滤波后的信号并通过接口CON4输出。Described signal filter circuit comprises interface CON4, low-pass filter chip U8, resistance R7 and R8 and electric capacity C23～C27, and the two ends of interface CON4 are respectively connected with the Fout pin of low-pass filter chip U8 and analog ground (AGND) , the CLKR pin, VCC- pin, AGND pin and VCC+ pin of the low-pass filter chip U8 are power supply pins, wherein the LS pin and the VCC pin are connected to the -5V power supply and connected to the analog ground (AGND) through parallel capacitors C24 and C25, The VCC+ pin is connected to the +5V power supply and connected to the analog ground (AGND) through the parallel capacitors C26 and C27, and the AGND pin is connected to the analog ground (AGND); the CLKIN pin of the pass filter chip U8 is connected to the digital ground (DGND) through the capacitor C23, and passed Resistor R8 and potentiometer VR3 are connected to their own CLKR pins, analog ground (AGND) and digital ground (DGND) are connected through resistor R7, the Fin pin of low-pass filter chip U8 is connected to the output signal from the signal amplifier circuit, After low-pass filter processing, the filtered signal is output at the Fout pin and output through the interface CON4.
所述的电压转电流电路包括接口CON5、压流转换芯片U9、三极管Q1、场效应管Q2、电阻R9～R18以及电容C28～C31，压流转换芯片U9的VSP脚和GND脚为电源引脚，VSP脚接+24V电源并经过并联的电容C30和C31接模拟地(AGND)，GND脚接模拟地(AGND)；压流转换芯片U9的VIN脚为信号输入端，经过下拉电阻R18接模拟地(AGND)，同时与电阻R16和电阻R17的一端相连，电阻R16和电阻R17的另一端分别接来自信号滤波电路的输出信号和压流转换芯片U9自身REGF脚的参考电压；压流转换芯片U9的SET脚依次通过电阻R13和电阻R14接模拟地(AGND)，压流转换芯片U9的REGS脚通过电阻R11接模拟地(AGND)，压流转换芯片U9的REGF脚通过电阻R12和自身的REGS脚相连，REGF脚通过电容C29接模拟地(AGND)；压流转换芯片U9的OD脚通过电阻R10接模拟地(AGND)，压流转换芯片U9的PAD脚直接接模拟地(AGND)；压流转换芯片U9的IS脚和VG脚分别接三极管Q1的发射极和集电极，三极管Q1的发射极通过电阻R9和基极相连，场效应管Q2的源极和三极管Q1的基极相连，场效应管Q2栅极与三极管Q1的集电极相连，场效应管Q2的漏极接电阻R15后作为电流信号输出端，并通过电容C28接模拟地(AGND)，电阻R15接接口CON5并输出电流信号。The voltage-to-current circuit includes an interface CON5, a voltage-to-current conversion chip U9, a transistor Q1, a field effect transistor Q2, resistors R9-R18, and capacitors C28-C31, and the VSP and GND pins of the voltage-to-current conversion chip U9 are power supply pins , the VSP pin is connected to the +24V power supply and connected to the analog ground (AGND) through parallel capacitors C30 and C31, and the GND pin is connected to the analog ground (AGND); the VIN pin of the voltage-current conversion chip U9 is the signal input terminal, and is connected to the analog ground through the pull-down resistor R18 The ground (AGND) is connected to one end of the resistor R16 and the resistor R17 at the same time, and the other end of the resistor R16 and the resistor R17 are respectively connected to the output signal from the signal filter circuit and the reference voltage of the REGF pin of the pressure-current conversion chip U9 itself; the voltage-current conversion chip The SET pin of U9 is connected to the analog ground (AGND) through the resistor R13 and the resistor R14 in turn, the REGS pin of the voltage-current conversion chip U9 is connected to the analog ground (AGND) through the resistor R11, and the REGF pin of the voltage-current conversion chip U9 is connected to the analog ground (AGND) through the resistor R12 and its own The REGS pin is connected, the REGF pin is connected to the analog ground (AGND) through the capacitor C29; the OD pin of the pressure-current conversion chip U9 is connected to the analog ground (AGND) through the resistor R10, and the PAD pin of the pressure-current conversion chip U9 is directly connected to the analog ground (AGND); The IS pin and VG pin of the voltage-current conversion chip U9 are respectively connected to the emitter and collector of the transistor Q1, the emitter of the transistor Q1 is connected to the base through the resistor R9, the source of the field effect transistor Q2 is connected to the base of the transistor Q1, The gate of the field effect transistor Q2 is connected to the collector of the transistor Q1, the drain of the field effect transistor Q2 is connected to the resistor R15 as the current signal output terminal, and connected to the analog ground (AGND) through the capacitor C28, and the resistor R15 is connected to the interface CON5 and outputs the current Signal.
所述的传感器激励电压电路包括接口CON6、稳压芯片U10、电位器VR4和VR5、电阻R19以及电容C32～C35，稳压芯片U10的GND脚和两个IN脚是电源引脚，4脚接模拟地(AGND)，两个IN脚接+12V并经过并联的电容C34和C35接模拟地(AGND)；稳压芯片U10的两个OUT脚相连后分别接电位器VR4和电位器VR5的公共端，单刀双掷开关S1的两个固定端接电位器VR4和电位器VR5的一端，单刀双掷开关S1的活动端经过电阻R19接模拟地(AGND)；稳压芯片U10的ADJ脚通过电阻R19接模拟地(AGND)，电位器VR4和VR5的公共端输出传感器激励电压并接接口CON6，并经过并联的电容C32和C33接模拟地(AGND)，接口CON6的1脚接模拟地(AGND)。The sensor excitation voltage circuit includes an interface CON6, a voltage stabilizing chip U10, potentiometers VR4 and VR5, a resistor R19, and capacitors C32 to C35. The GND pin and two IN pins of the voltage stabilizing chip U10 are power supply pins, and the 4 pins are connected to Analog ground (AGND), the two IN pins are connected to +12V and connected to the analog ground (AGND) through parallel capacitors C34 and C35; the two OUT pins of the voltage regulator chip U10 are connected to the common of potentiometer VR4 and potentiometer VR5 respectively The two fixed ends of the single-pole double-throw switch S1 are connected to one end of the potentiometer VR4 and potentiometer VR5, and the movable end of the single-pole double-throw switch S1 is connected to the analog ground (AGND) through the resistor R19; the ADJ pin of the voltage regulator chip U10 is connected through the resistor R19 is connected to the analog ground (AGND), the common end of the potentiometer VR4 and VR5 outputs the sensor excitation voltage and connected to the interface CON6, and connected to the analog ground (AGND) through the parallel capacitors C32 and C33, and the 1 pin of the interface CON6 is connected to the analog ground (AGND ).
优选的，所述的24V转±15V电源转换模块U1采用型号为HDN3-24S05A1，所述的稳压芯片U2采用型号为LM2940CT-12，所述的稳压芯片U3采用型号为L7912CV，所述的稳压芯片U4采用型号为ADP3303，所述的稳压芯片U5采用型号为L7905CV。Preferably, the model of the 24V to ±15V power conversion module U1 is HDN3-24S05A1, the model of the voltage stabilizing chip U2 is LM2940CT-12, and the model of the voltage stabilizing chip U3 is L7912CV. The voltage stabilizing chip U4 adopts a model of ADP3303, and the voltage stabilizing chip U5 adopts a model of L7905CV.
优选的，所述的运算放大器芯片U6采用型号为INA114，所述运算放大器芯片U7采用型号为OP177。Preferably, the operational amplifier chip U6 adopts a model of INA114, and the operational amplifier chip U7 adopts a model of OP177.
优选的，所述的滤波器芯片U8采用型号为TLC14C。Preferably, the filter chip U8 adopts a model of TLC14C.
优选的，所述的滤波器芯片U9采用型号为XTR111。Preferably, the filter chip U9 adopts a model of XTR111.
优选的，所述的滤波器芯片U10采用型号为LT1965。Preferably, the filter chip U10 adopts a model of LT1965.
本发明具有的有益效果是：The beneficial effects that the present invention has are:
1.可将微弱的动态重量电压信号经过放大、滤波后，转换为抗干扰能力强，适合现场远距离传输的电流信号；1. After amplifying and filtering the weak dynamic weight voltage signal, it can be converted into a current signal with strong anti-interference ability and suitable for long-distance transmission on site;
2.低通滤波器截止频率可调，可根据重量设备类型、传送带速度、称重对象特性将滤波器调节至合适的截止频率；2. The cut-off frequency of the low-pass filter is adjustable, and the filter can be adjusted to a suitable cut-off frequency according to the type of weighing equipment, the speed of the conveyor belt, and the characteristics of the weighing object;
3.信号调理电路线性度好、长期工作漂移低；3. The signal conditioning circuit has good linearity and low long-term working drift;
4.经过电磁兼容和抗静电设计，工作性能稳定。4. After electromagnetic compatibility and antistatic design, the working performance is stable.
附图说明Description of drawings
图1是本发明的总体结构框图。Fig. 1 is the overall structural block diagram of the present invention.
图2是本发明电源管理电路的电路结构图。Fig. 2 is a circuit structure diagram of the power management circuit of the present invention.
图3是本发明信号放大电路的电路结构图。Fig. 3 is a circuit structure diagram of the signal amplifying circuit of the present invention.
图4是本发明信号滤波电路的电路结构图。Fig. 4 is a circuit structure diagram of the signal filter circuit of the present invention.
图5是本发明电压转电流电路的电路结构图。Fig. 5 is a circuit structure diagram of the voltage-to-current circuit of the present invention.
图6是本发明传感器激励电压电路的电路结构图。Fig. 6 is a circuit structure diagram of the sensor excitation voltage circuit of the present invention.
图7是本发明线性度测试图。Fig. 7 is a linearity test diagram of the present invention.
图8是本发明长期工作稳定性测试图。Fig. 8 is a long-term working stability test chart of the present invention.
图中：电源管理电路1、信号放大电路2、信号滤波电路3、电压转电流电路4、传感器激励电压电路5。In the figure: power management circuit 1, signal amplification circuit 2, signal filter circuit 3, voltage-to-current circuit 4, sensor excitation voltage circuit 5.
具体实施方式detailed description
以下结合附图和实施例，对本发明进行进一步的描述。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
如图1所示，本发明的模块包括电源管理电路1、信号放大电路2、信号滤波电路3、电压转电流电路4和传感器激励电压电路5；其中电源管理电路1分别与信号放大电路2、信号滤波电路3、电压转电流电路4和传感器激励电压电路5相连接进行供电，信号放大电路2、信号滤波电路3、电压转电流电路4顺次连接并作为传感器动态重量信号的通路。As shown in Figure 1, the module of the present invention includes a power management circuit 1, a signal amplification circuit 2, a signal filter circuit 3, a voltage-to-current circuit 4 and a sensor excitation voltage circuit 5; wherein the power management circuit 1 is connected to the signal amplification circuit 2, The signal filter circuit 3, the voltage-to-current circuit 4 and the sensor excitation voltage circuit 5 are connected for power supply, and the signal amplification circuit 2, the signal filter circuit 3, and the voltage-to-current circuit 4 are connected in sequence and serve as a path for the sensor dynamic weight signal.
如图2所示，电源管理电路1包括电源接口CON1、电容C1～C14、电阻R1、二极管D1、发光二极管D2、24V转±15V电源转换模块U1以及稳压芯片U2～U5，电路经电源接口CON1接+24V供电，二极管D1的阳极接+24V电源正极，二极管D1的阴极经钽电容C1与模拟地相连，二极管D1的阴极与24V转±15V电源转换模块U1的输入端VIN脚相连，二极管D1的阴极经电阻R1和发光二极管D2再接模拟地；24V转±15V电源转换模块U1的电源输出端-VO和+VO脚分别输出-15V和+15V电源，并分别通过并联的电容C3、C4以及电容C5、C6接模拟地；稳压芯片U2的输入端Vin脚接+15V电源，输出端Vout脚输出﹢12V电源，输出端Vout脚通过并联的电容C7和C8接模拟地；稳压芯片U2输出的+12V电源接稳压芯片U4的5、7、8脚，稳压芯片U4的输出端1脚和2脚相连接并输出5V电源，并通过并联的电容C11和C12接模拟地，同时稳压芯片U4的1脚和2脚通过电容C2连接到3脚，稳压芯片U4的4脚接模拟地；稳压芯片U3的输入端Vin脚接-15V电源，稳压芯片U3的输出端Vout脚输出-12V电源并通过并联的电容C9和C10接模拟地；稳压芯片U5的输入端Vin脚接-12V电源，U5的输出端Vout脚输出-5V电源并通过并联的电容C13和C14接模拟地。As shown in Figure 2, the power management circuit 1 includes a power interface CON1, capacitors C1-C14, resistor R1, diode D1, light-emitting diode D2, 24V to ±15V power conversion module U1, and voltage regulator chips U2-U5. CON1 is connected to +24V power supply, the anode of diode D1 is connected to the positive pole of +24V power supply, the cathode of diode D1 is connected to analog ground through tantalum capacitor C1, the cathode of diode D1 is connected to the input terminal VIN pin of 24V to ±15V power conversion module U1, the diode The cathode of D1 is connected to the analog ground through the resistor R1 and the light-emitting diode D2; the power output terminals -VO and +VO of the 24V to ±15V power conversion module U1 output -15V and +15V power respectively, and respectively through the parallel capacitors C3, C4 and capacitors C5 and C6 are connected to the analog ground; the input terminal Vin pin of the voltage regulator chip U2 is connected to +15V power supply, the output terminal Vout pin outputs +12V power supply, and the output terminal Vout pin is connected to the analog ground through parallel capacitors C7 and C8; The +12V power output from the chip U2 is connected to pins 5, 7, and 8 of the voltage regulator chip U4, and the output pin 1 and pin 2 of the voltage regulator chip U4 are connected to output a 5V power supply, and connected to the analog ground through parallel capacitors C11 and C12 At the same time, the pin 1 and pin 2 of the voltage regulator chip U4 are connected to pin 3 through the capacitor C2, and the pin 4 of the voltage regulator chip U4 is connected to the analog ground; the input terminal Vin pin of the voltage regulator chip U3 is connected to the -15V power supply, and the pin of the voltage regulator chip U3 The Vout pin of the output terminal outputs -12V power supply and is connected to the analog ground through parallel capacitors C9 and C10; the input terminal Vin pin of the voltage regulator chip U5 is connected to the -12V power supply, and the output terminal Vout pin of U5 outputs -5V power supply and is connected to the parallel capacitor C13 Connect C14 to analog ground.
如图3所示，信号放大电路2包括接口CON2和接口CON3、运算放大器芯片U6和U7、电位器VR1和VR2、电阻R2～R6和电容C15～C22，原始的动态重量信号由接口CON2接入电路，接口CON2的两个脚分别与运算放大器芯片U6的输入端5脚和4脚相连；运算放大器芯片U6的2脚依次经过电阻R2、电位器VR1和自身的15脚相连；运算放大器芯片U6的10脚接模拟地，运算放大器芯片U6的电源引脚13脚和7脚分别接+12V和-12V电源，并分别经过并联的电容C15、C16以及电容C17、C18接模拟地。运算放大器芯片U6的11脚和12脚相连，并经过电阻R5与运算放大器芯片U7的反向输入端2脚相连，运算放大器芯片U7的3脚经过电阻R6接模拟地，运算放大器芯片U7的7脚和4脚分别接+12V和-12V电源，并分别经过并联电容C19、C20以及C21、C22接模拟地；电阻R3的一端和电位器VR2的公共脚相连，电位器VR2两端分别连接模拟地和+5V电源，电阻R3的另一端和运算放大器芯片U7的2脚相连，运算放大器芯片U7的2脚通过电阻R4和自身的6脚相连，运算放大器芯片U7的6脚作为信号放大电路的输出脚，通过与接口CON3相连输出放大后的信号，将输出信号连接至信号滤波电路3。As shown in Figure 3, the signal amplifying circuit 2 includes interfaces CON2 and CON3, operational amplifier chips U6 and U7, potentiometers VR1 and VR2, resistors R2-R6 and capacitors C15-C22, and the original dynamic weight signal is connected through the interface CON2 circuit, the two pins of the interface CON2 are respectively connected to the 5 pins and 4 pins of the input terminal of the operational amplifier chip U6; The pin 10 of the operational amplifier chip U6 is connected to the analog ground, and the power supply pins 13 and 7 of the operational amplifier chip U6 are respectively connected to +12V and -12V power supplies, and are respectively connected to the analog ground through parallel capacitors C15, C16, and capacitors C17 and C18. The 11th and 12th pins of the operational amplifier chip U6 are connected, and are connected to the 2nd pin of the reverse input terminal of the operational amplifier chip U7 through the resistor R5, the 3rd pin of the operational amplifier chip U7 is connected to the analog ground through the resistor R6, and the 7th pin of the operational amplifier chip U7 Pin and pin 4 are respectively connected to +12V and -12V power supply, and connected to analog ground through parallel capacitors C19, C20, C21, C22 respectively; one end of resistor R3 is connected to the common pin of potentiometer VR2, and the two ends of potentiometer VR2 are respectively connected to analog ground. The ground is connected to the +5V power supply, the other end of the resistor R3 is connected to the 2-pin of the operational amplifier chip U7, the 2-pin of the operational amplifier chip U7 is connected to its own 6-pin through the resistor R4, and the 6-pin of the operational amplifier chip U7 is used as the signal amplification circuit The output pin is connected to the interface CON3 to output the amplified signal, and the output signal is connected to the signal filter circuit 3 .
如图4所示，信号滤波电路3包括接口CON4、低通滤波器芯片U8、电阻R7和R8以及电容C23～C27，接口CON4的两端分别与低通滤波器芯片U8的Fout脚和模拟地连接，低通滤波器芯片U8的CLKR脚、VCC-脚、AGND脚和VCC+脚为电源引脚，其中LS脚和VCC脚接-5V电源并经过并联的电容C24和C25接模拟地，VCC+脚接+5V电源并经过并联的电容C26和C27接模拟地，AGND脚接模拟地；通滤波器芯片U8的CLKIN脚通过电容C23接数字地DGND，并通过电阻R8和电位器VR3和自身的CLKR脚连接，模拟地和数字地DGND之间通过电阻R7相连接，低通滤波器芯片U8的Fin脚接来自信号放大电路2的输出信号，经过低通滤波处理后在Fout脚输出滤波后的信号并通过接口CON4输出。As shown in Figure 4, the signal filtering circuit 3 includes an interface CON4, a low-pass filter chip U8, resistors R7 and R8, and capacitors C23-C27, and the two ends of the interface CON4 are respectively connected to the Fout pin of the low-pass filter chip U8 and the analog ground Connection, the CLKR pin, VCC- pin, AGND pin and VCC+ pin of the low-pass filter chip U8 are power supply pins, in which the LS pin and VCC pin are connected to the -5V power supply and connected to the analog ground through parallel capacitors C24 and C25, and the VCC+ pin Connect to the +5V power supply and connect to the analog ground through parallel capacitors C26 and C27, and connect the AGND pin to the analog ground; the CLKIN pin of the filter chip U8 is connected to the digital ground DGND through the capacitor C23, and through the resistor R8 and the potentiometer VR3 and its own CLKR Pin connection, the analog ground and digital ground DGND are connected through resistor R7, the Fin pin of the low-pass filter chip U8 is connected to the output signal from the signal amplifier circuit 2, and the filtered signal is output at the Fout pin after low-pass filtering And output through interface CON4.
如图5所示，电压转电流电路4包括接口CON5、压流转换芯片U9、三极管Q1、场效应管Q2、电阻R9～R18以及电容C28～C31，压流转换芯片U9的VSP脚和GND脚为电源引脚，VSP脚接+24V电源并经过并联的电容C30和C31接模拟地，GND脚接模拟地；压流转换芯片U9的VIN脚为信号输入端，经过下拉电阻R18接模拟地，同时与电阻R16和电阻R17的一端相连，电阻R16和电阻R17的另一端分别接来自信号滤波电路3的输出信号和压流转换芯片U9自身REGF脚的参考电压；压流转换芯片U9的SET脚依次通过电阻R13和电阻R14接模拟地，压流转换芯片U9的REGS脚通过电阻R11接模拟地，压流转换芯片U9的REGF脚通过电阻R12和自身的REGS脚相连，REGF脚通过电容C29接模拟地；压流转换芯片U9的OD脚通过电阻R10接模拟地，压流转换芯片U9的PAD脚直接接模拟地；压流转换芯片U9的IS脚和VG脚分别接三极管Q1的发射极和集电极，三极管Q1的发射极通过电阻R9和基极相连，场效应管Q2的源极和三极管Q1的基极相连，场效应管Q2栅极与三极管Q1的集电极相连，场效应管Q2的漏极接电阻R15后作为电流信号输出端，并通过电容C28接模拟地，电阻R15接接口CON5并输出适合工业传输的4-20mA电流信号。As shown in Figure 5, the voltage-to-current circuit 4 includes an interface CON5, a voltage-to-current conversion chip U9, a transistor Q1, a field effect transistor Q2, resistors R9-R18, and capacitors C28-C31, and the VSP pin and GND pin of the voltage-to-current conversion chip U9 It is the power supply pin, the VSP pin is connected to +24V power supply and connected to the analog ground through parallel capacitors C30 and C31, and the GND pin is connected to the analog ground; the VIN pin of the voltage-current conversion chip U9 is the signal input terminal, connected to the analog ground through the pull-down resistor R18, At the same time, it is connected to one end of resistor R16 and resistor R17, and the other end of resistor R16 and resistor R17 is respectively connected to the output signal from the signal filter circuit 3 and the reference voltage of the REGF pin of the voltage-current conversion chip U9 itself; the SET pin of the voltage-current conversion chip U9 Connect to the analog ground through resistor R13 and resistor R14 in turn, connect the REGS pin of the voltage-current conversion chip U9 to the analog ground through the resistor R11, connect the REGF pin of the voltage-current conversion chip U9 to its own REGS pin through the resistor R12, and connect the REGF pin through the capacitor C29 Analog ground; the OD pin of the pressure-current conversion chip U9 is connected to the analog ground through the resistor R10, and the PAD pin of the pressure-current conversion chip U9 is directly connected to the analog ground; the IS pin and the VG pin of the pressure-current conversion chip U9 are respectively connected to the emitter of the transistor Q1 and The collector, the emitter of the transistor Q1 is connected to the base through the resistor R9, the source of the field effect transistor Q2 is connected to the base of the transistor Q1, the gate of the field effect transistor Q2 is connected to the collector of the transistor Q1, and the gate of the field effect transistor Q2 is connected to the collector of the transistor Q1. The drain is connected to the resistor R15 as the current signal output terminal, and connected to the analog ground through the capacitor C28, and the resistor R15 is connected to the interface CON5 and outputs a 4-20mA current signal suitable for industrial transmission.
如图6所示，传感器激励电压电路5包括接口CON6、稳压芯片U10、电位器VR4和VR5、电阻R19以及电容C32～C35，稳压芯片U10的GND脚和两个IN脚是电源引脚，4脚接模拟地，两个IN脚接+12V并经过并联的电容C34和C35接模拟地；稳压芯片U10的两个OUT脚相连后分别接电位器VR4和电位器VR5的公共端，单刀双掷开关S1的两个固定端接电位器VR4和电位器VR5的一端，单刀双掷开关S1的活动端经过电阻R19接模拟地；稳压芯片U10的ADJ脚通过电阻R19接模拟地，电位器VR4和VR5的公共端输出传感器激励电压并接接口CON6，并经过并联的电容C32和C33接模拟地，接口CON6的1脚接模拟地。As shown in Figure 6, the sensor excitation voltage circuit 5 includes interface CON6, voltage regulator chip U10, potentiometers VR4 and VR5, resistor R19, and capacitors C32-C35. The GND pin and two IN pins of the voltage regulator chip U10 are power supply pins , 4 pins are connected to analog ground, two IN pins are connected to +12V and connected to analog ground through parallel capacitors C34 and C35; the two OUT pins of voltage regulator chip U10 are connected to the common end of potentiometer VR4 and potentiometer VR5 respectively, The two fixed ends of the single-pole double-throw switch S1 are connected to one end of the potentiometer VR4 and the potentiometer VR5, and the movable end of the single-pole double-throw switch S1 is connected to the analog ground through the resistor R19; the ADJ pin of the voltage regulator chip U10 is connected to the analog ground through the resistor R19. The common end of the potentiometer VR4 and VR5 outputs the sensor excitation voltage and connects to the interface CON6, and connects to the analog ground through the parallel capacitors C32 and C33, and connects the pin 1 of the interface CON6 to the analog ground.
本发明的工作过程如下：Working process of the present invention is as follows:
在动态重量设备工作过程中，由于传送带运行过程中的机械振动，产品翻滚振动等干扰因素的影响，重量传感器输出的原始重量信号除了包含真实的产品重量外，还伴随着各种干扰载荷信号。During the working process of dynamic weight equipment, due to the influence of mechanical vibration during the operation of the conveyor belt, product tumbling vibration and other interference factors, the original weight signal output by the weight sensor not only contains the real product weight, but also accompanied by various interference load signals.
重量传感器的电源线和信号线接入模块后，重量传感器的激励电压由传感器激励电压电路5提供，用户可根据传感器的类型以及重量对象的重量，通过开关S1选择传感器激励电压(5V或10V输出)。After the power line and signal line of the weight sensor are connected to the module, the excitation voltage of the weight sensor is provided by the sensor excitation voltage circuit 5, and the user can select the sensor excitation voltage (5V or 10V output ).
动态重量设备开始工作后，来自重量传感器的原始重量信号先经过模块信号放大电路2将mV级别的信号放大至V级，用户可以通过电位器VR1实现对放大信号的增益调节(增益范围为25～1000)，使信号放大到适合的电压幅值；通过电位器VR2实现对信号的零点电位调节。After the dynamic weight equipment starts to work, the original weight signal from the weight sensor first passes through the module signal amplifier circuit 2 to amplify the mV-level signal to V-level, and the user can adjust the gain of the amplified signal through the potentiometer VR1 (the gain range is 25~ 1000), the signal is amplified to a suitable voltage amplitude; the zero point potential adjustment of the signal is realized through the potentiometer VR2.
信号放大电路在将真实产品重量信号放大的同时，干扰信号也被放大；放大后的信号经过信号滤波电路3将干扰信号滤除，用户可以根据重量信号特性，通过调节电位器VR3设定低通滤波器截止频率(截止频率范围为3～300Hz)，最大限度地消除扰动信号并保留重量信号；消除干扰后的电压信号到达电压转电流电路(4，将电压信号转换为适合工业现场传输的4-20mA电流信号，以增强在传输过程中的抗干扰能力。While the signal amplification circuit amplifies the real product weight signal, the interference signal is also amplified; the amplified signal passes through the signal filter circuit 3 to filter out the interference signal, and the user can set the low-pass by adjusting the potentiometer VR3 according to the weight signal characteristics. The cutoff frequency of the filter (the cutoff frequency range is 3~300Hz), eliminates the disturbance signal to the greatest extent and retains the weight signal; the voltage signal after the interference is eliminated reaches the voltage to current circuit (4, which converts the voltage signal into a 4 suitable for industrial field transmission) -20mA current signal to enhance the anti-interference ability in the transmission process.
重量电流信号可通过双绞线等介质远距离传输至单片机、PLC等工业控制器进行计算处理，得到产品重量。The weight current signal can be transmitted to industrial controllers such as single-chip microcomputers and PLCs for calculation and processing through twisted-pair wires and other media to obtain product weight.
具体实施中，24V转±15V电源转换模块U1采用型号为HDN3-24S05A1，稳压芯片U2采用型号为LM2940CT-12，稳压芯片U3采用型号为L7912CV，稳压芯片U4采用型号为ADP3303，稳压芯片U5采用型号为L7905CV；运算放大器芯片U6采用型号为INA114，运算放大器芯片U7采用型号为OP177；滤波器芯片U8采用型号为TLC14C，滤波器芯片U9采用型号为XTR111，滤波器芯片U10采用型号为LT1965。In the specific implementation, the model of 24V to ±15V power conversion module U1 is HDN3-24S05A1, the model of voltage regulator chip U2 is LM2940CT-12, the model of voltage regulator chip U3 is L7912CV, the model of voltage regulator chip U4 is ADP3303, and the model of regulator chip U4 is ADP3303. The chip U5 adopts the model L7905CV; the operational amplifier chip U6 adopts the model INA114, the operational amplifier chip U7 adopts the model OP177; the filter chip U8 adopts the model TLC14C, the filter chip U9 adopts the model XTR111, and the filter chip U10 adopts the model LT1965.
信号滤波电路3中的低通滤波器芯片U8截止频率在3～300Hz范围内可调，具体实施能够根据重量设备类型、传送带速度、重量对象特性将滤波器调节至合适的截止频率。The cut-off frequency of the low-pass filter chip U8 in the signal filter circuit 3 is adjustable within the range of 3-300 Hz, and the specific implementation can adjust the filter to an appropriate cut-off frequency according to the type of weight equipment, the speed of the conveyor belt, and the characteristics of the weight object.
结合图7，图7是以上实施例的线性度测试结果。在传送带运行状态下，将放大倍数调节至2000倍，将滤波器的截止频率调节至50Hz，分别用质量为10克、20克、30克、50克和100克的标准砝码作为称重载荷，记录输出电流。对得到的散点进行线性拟合，拟合优度达到0.9999。实验结果表明，在动态情况下本发明具有良好的线性度。With reference to FIG. 7 , FIG. 7 is the linearity test result of the above embodiment. In the running state of the conveyor belt, adjust the magnification to 2000 times, adjust the cut-off frequency of the filter to 50Hz, and use standard weights with masses of 10 grams, 20 grams, 30 grams, 50 grams and 100 grams as weighing loads , record the output current. Linear fitting was performed on the obtained scattered points, and the goodness of fit reached 0.9999. Experimental results show that the present invention has good linearity under dynamic conditions.
结合图8，图8以上实施例的长期稳定性和温度漂移测试结果。在传送带运行状态下，将放大倍数调节至2000倍，将滤波器的截止频率调节至50Hz，将模块输出的电流信号接入控制器，得到动态称重结果。采用一枚重量为51.5克的鸡蛋作为实验称重载荷，每隔6小时进行50次称重实验，记录称重结果并计算平均值。连续进行84小时时长测试，称重结果在实际重量上下波动，偏差范围小于±0.5克。实验结果表明，本发明长期工作稳定性良好，称重结果受温度影响小。With reference to FIG. 8 , the long-term stability and temperature drift test results of the above embodiments are shown in FIG. 8 . In the running state of the conveyor belt, adjust the magnification to 2000 times, adjust the cut-off frequency of the filter to 50Hz, and connect the current signal output by the module to the controller to obtain the dynamic weighing result. An egg with a weight of 51.5 grams was used as the experimental weighing load, and 50 weighing experiments were carried out every 6 hours, and the weighing results were recorded and the average value was calculated. The test was carried out continuously for 84 hours, and the weighing result fluctuated up and down the actual weight, and the deviation range was less than ±0.5 grams. Experimental results show that the invention has good long-term working stability, and the weighing result is less affected by temperature.
由此可见，本发明的低通滤波器截止频率在3～300Hz范围内可调，能满足动态重量设备重量信号响应快，工况差异大的需求，能将微弱的原始动态重量信号放大，通过低通滤波电路滤除扰动载荷信号，并将电压信号转换为适合工业现场传输的4-20mA电流信号，提高动态重量设备的计量精度。It can be seen that the cut-off frequency of the low-pass filter of the present invention is adjustable within the range of 3-300 Hz, which can meet the requirements of fast weight signal response of dynamic weight equipment and large differences in working conditions, and can amplify the weak original dynamic weight signal, and pass The low-pass filter circuit filters out the disturbing load signal, and converts the voltage signal into a 4-20mA current signal suitable for industrial field transmission, improving the measurement accuracy of dynamic weighing equipment.
上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.
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| CN108344480B (en) * | 2018-01-25 | 2023-12-22 | 北京农业信息技术研究中心 | Automatic weighing method and system for poultry |
| CN111896084A (en) * | 2020-06-22 | 2020-11-06 | 沙洋威莱电子信息有限公司 | Prompting lamp circuit for pressure detection |
| CN112330947A (en) * | 2020-11-20 | 2021-02-05 | 浙江大学 | Secondary water supply pump house data acquisition circuit based on STM32 singlechip |
| CN113503933A (en) * | 2021-08-04 | 2021-10-15 | 上海朝辉压力仪器有限公司 | Hall flowmeter with current output function |
| CN114280358A (en) * | 2021-11-10 | 2022-04-05 | 大连柏盛源科技有限公司 | Charge type sensor signal acquisition device |
| CN114280358B (en) * | 2021-11-10 | 2023-11-28 | 大连柏盛源科技有限公司 | Charge type sensor signal acquisition device |
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