CN209608908U - Fast and stable constant current source system for automatic switching of dual-lamp fault diagnosis - Google Patents
Fast and stable constant current source system for automatic switching of dual-lamp fault diagnosis Download PDFInfo
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Abstract
本实用新型涉及一种双灯故障诊断自动切换的快速稳定恒流源系统，包括控制处理、可控恒流源、双灯切换和电源四个模块，电源模块分别连接控制处理模块、可控恒流源模块和双灯切换模块，四个模块分别组成数字+模拟双闭环快速稳定恒流源电路和双灯故障控制检测+自动切换两个功能电路。本实用新型提出的数字+模拟双闭环电路，解决了现有恒流驱动卤钨灯稳定时间长、恒流源调试过程复杂等问题；双灯故障控制检测+自动切换无须控制，当工作灯出现故障时，能够自动切换备用灯作为光源，避免了现有仪器采用控制机械开关进行备用灯切换时的开合抖动和过冲而影响电路工作不稳定；提高了工作效率，降低了使用成本和运行费用。
The utility model relates to a fast and stable constant current source system for automatic switching of dual lamp fault diagnosis, comprising four modules of control processing, controllable constant current source, dual lamp switching and power supply. Flow source module and dual lamp switching module, four modules respectively form digital + analog double closed-loop fast and stable constant current source circuit and dual lamp fault control detection + automatic switching two functional circuits. The digital + analog double closed-loop circuit proposed by the utility model solves the problems of long stability time of the existing constant current driven halogen tungsten lamp, complicated constant current source debugging process, etc.; dual lamp fault control detection + automatic switching does not need to be controlled, and when the working lamp fails It can automatically switch the standby lamp as the light source, avoid the opening and closing jitter and overshoot when the existing instrument uses the control mechanical switch to switch the standby lamp and affect the unstable circuit operation; improve the work efficiency and reduce the use cost and operating cost .
Description
技术领域technical field
本实用新型涉及一种电子测量及控制、光谱分析及仪器定标等光源稳流供电的电路，尤其是适用于要求供电快速稳定、备用灯自动切换的仪器，特别是便携式光谱仪、机载高光谱的光源系统。The utility model relates to a circuit for steady-current power supply of light sources such as electronic measurement and control, spectrum analysis and instrument calibration, etc., and is especially suitable for instruments requiring fast and stable power supply and automatic switching of standby lamps, in particular portable spectrometers, airborne hyperspectrometers, etc. light source system.
背景技术Background technique
现有的恒流源技术成熟，采用基于标准电压的负反馈放大电路，通过比较标准电压与采样反馈电压，调整放大电路输出，从而控制负载电路中的电流恒定。通过改变标准电压，可实现恒流源的输出量的控制，称其为可控恒流源。精度和稳定性是恒流源的重要技术指标，目前国内外恒流源的稳定性、精度等指标均已经达到0.1％以上。但对恒流源的稳定调节时间，就目前研究而言关注度不大，资料显示的有：天水康采测控技术研究所曾滨(1994年)研发的高精度恒流源，稳定性可达到±0.005％，但是在10分钟内会出现电流缓慢上升或者下降的趋势；苏州大学吴茂成(2011年)研制的高精度宽范围恒流源输出电流为1uA-1A,精度为0.152％，稳定性为0.047％，预热时间为10min；在上世纪，便已经进行恒流源研究，但尚无恒流源快速稳定的研究报道。The existing constant current source technology is mature, and a negative feedback amplifier circuit based on a standard voltage is used, and the output of the amplifier circuit is adjusted by comparing the standard voltage and the sampled feedback voltage, thereby controlling the current in the load circuit to be constant. By changing the standard voltage, the output of the constant current source can be controlled, which is called a controllable constant current source. Accuracy and stability are important technical indicators of constant current sources. At present, the stability and accuracy of constant current sources at home and abroad have reached more than 0.1%. However, the stable adjustment time of the constant current source has not been paid much attention to the current research. The data show that: the high-precision constant current source developed by Zeng Bin (1994) of Tianshui Kangcai Measurement and Control Technology Research Institute, the stability can reach ±0.005%, but the current tends to rise or fall slowly within 10 minutes; the output current of the high-precision wide-range constant current source developed by Wu Maocheng (2011) of Soochow University is 1uA-1A, the accuracy is 0.152%, and the stability is 0.047%, the preheating time is 10min; in the last century, research on constant current source has been carried out, but there is no research report on fast and stable constant current source.
PID控制是常用的一种闭环调节控制方法，但在恒流源系统中，PID算法的应用并未明显提高恒流源的精度和稳定性。常州工学院鲍玉军等人(2013)设计的PID算法的变负载高稳定恒流源，输出电流0～2000mA，精度、恒流稳定性均达到0.1％。而且PID为动态调整，分析可知其调节快速性很难保证。PID control is a commonly used closed-loop regulation control method, but in the constant current source system, the application of the PID algorithm does not significantly improve the accuracy and stability of the constant current source. The PID algorithm designed by Bao Yujun et al. (2013) of Changzhou Institute of Technology has a variable load and high stability constant current source, the output current is 0-2000mA, and the accuracy and constant current stability reach 0.1%. Moreover, the PID is dynamically adjusted, and the analysis shows that the rapidity of its adjustment is difficult to guarantee.
此外，对于需要备用灯的仪器，其双灯切换常采用机械开关或模拟开关，二者对比，模拟开关具有功耗低、速度快、无机械触点、体积小和使用寿命长等特点。为方便控制，常采用可控机械开关继电器，其开关频率低、开关切换时，由于开合抖动和电流过冲会对工作电路的稳定性造成影响，引入噪声；且有机械疲劳和安全隐患。In addition, for instruments that need spare lamps, mechanical switches or analog switches are often used for switching between two lamps. Compared with the two, analog switches have the characteristics of low power consumption, fast speed, no mechanical contacts, small size and long service life. In order to facilitate control, controllable mechanical switch relays are often used. The switching frequency is low. When switching, due to the opening and closing jitter and current overshoot, the stability of the working circuit will be affected, and noise will be introduced; and there will be mechanical fatigue and safety hazards.
发明内容SUMMARY OF THE INVENTION
本实用新型的目的是针对光谱仪光源光谱稳定性高、稳定时间短的要求，而现有恒流源存在工作前期缓慢变化而造成的稳定时间长问题，提供一种输出电流可控的“数字+模拟双闭环”快速稳定恒流源，其为通过“数字+模拟双闭环”的方式实现的一种能够快速稳定的可控恒流源。通过双闭环电路的大预置值启动快速预热、双闭环PID粗调快稳和单闭环稳流的三段工作模式，加快调节过程，快速达到电流稳定状态。The purpose of this utility model is to meet the requirements of high spectral stability and short stabilization time of the light source of the spectrometer, and the existing constant current source has the problem of long stabilization time caused by the slow change in the early stage of operation, and provides a "digital + analog" with controllable output current. Double closed loop" fast and stable constant current source, which is a fast and stable controllable constant current source realized by "digital + analog double closed loop". The three-stage working mode of rapid preheating, double closed-loop PID coarse adjustment and fast stabilization and single closed-loop steady current is activated by the large preset value of the double closed-loop circuit, which speeds up the adjustment process and quickly reaches the current stable state.
同时，本实用新型的另一个目的是针对仪器工作灯和备用灯的切换采用控制机械开关时存在开合抖动和过冲而影响电路工作不稳定问题，提供一种双灯故障控制检测+自动切换的电路，利用场效应管的导通特性，实现工作灯自动故障检测和切换，无须控制器控制，只有在备用灯故障检测时需要控制，从而避免在供电系统工作时进行继电器的开合，影响仪器工作的稳定性。At the same time, another purpose of the present utility model is to provide a dual-lamp fault control detection + automatic switching for the problem of switching jitter and overshoot when the switch between the instrument work lamp and the standby lamp is used to control the mechanical switch and affect the circuit operation instability. The circuit uses the conduction characteristics of the field effect tube to realize the automatic fault detection and switching of the working light, without the need for controller control, only when the standby light fault is detected, so as to avoid the opening and closing of the relay when the power supply system is working. The stability of the instrument work.
本实用新型的目的是通过以下技术方案实现的：The purpose of this utility model is to realize through the following technical solutions:
一种双灯故障诊断自动切换的快速稳定恒流源系统，包括控制处理、可控恒流源、双灯切换和电源四个模块，电源模块分别连接控制处理模块、可控恒流源模块和双灯切换模块，四个模块分别组成数字+模拟双闭环快速稳定恒流源电路和双灯故障控制检测+自动切换两个功能电路；A fast and stable constant current source system for automatic switching of dual lamp fault diagnosis, comprising four modules of control processing, controllable constant current source, dual lamp switching and power supply, the power supply module is respectively connected to the control processing module, the controllable constant current source module and the power supply module. Dual lamp switching module, four modules respectively form digital + analog dual closed-loop fast and stable constant current source circuit and dual lamp fault control detection + automatic switching two functional circuits;
所述的控制处理模块，包括微处理器、标准电压输出端、电压采集端1、电压采集端2、控制信号端、状态信号端、串行通讯端、电源端UC组成，其中微处理器包括MPU、DAC、双通道ADC电路、串口、IO口；DAC通过IO口与标准电压输出端连接；双通道ADC通过IO口分别与电压采集端1、电压采集端2连接；串口与串行通信端口连接；控制信号端、状态信号端与微处理器的IO口连接；微处理器的电源口与电源端UC连接；The control processing module includes a microprocessor, a standard voltage output terminal, a voltage acquisition terminal 1, a voltage acquisition terminal 2, a control signal terminal, a status signal terminal, a serial communication terminal, and a power supply terminal U C , wherein the microprocessor is composed of Including MPU, DAC, dual-channel ADC circuit, serial port, IO port; DAC is connected with standard voltage output terminal through IO port; dual-channel ADC is connected with voltage acquisition terminal 1 and voltage acquisition terminal 2 respectively through IO port; serial port and serial communication Port connection; the control signal terminal and the status signal terminal are connected with the IO port of the microprocessor; the power port of the microprocessor is connected with the power supply terminal U C ;
所述的可控恒流源模块，由差分放大电路、采样电阻、反馈电路、标准电压输入端、反馈电压端、负载接口正负端、电源端UI组成，该模块为模拟闭环的恒流源电路，当标准电压输入端接入一标准电压，其输出的电流值为标准电压与采样电阻的比值，差分放大电路2个输入端：标准电压端和反馈电压端分别与标准电压输出端、反馈电路输出端相连，其输出端与采样电阻一端连接；反馈电路的2个输入端分别与采样电阻的2端相连，其输出端和差分放大电路的反馈电压输入端、反馈电压端连接；负载接口正端与电源端UI连接、负载接口负端与采样电阻一端串行连接；电源UI正负端分别与差分放大电路、反馈电路的正负供电端连接；The controllable constant current source module is composed of a differential amplifier circuit, a sampling resistor , a feedback circuit, a standard voltage input terminal, a feedback voltage terminal, a positive and negative terminal of the load interface, and a power supply terminal UI. This module is an analog closed-loop constant current. The source circuit, when the standard voltage input terminal is connected to a standard voltage, the output current value is the ratio of the standard voltage to the sampling resistor. The differential amplifier circuit has two input terminals: the standard voltage terminal and the feedback voltage terminal, respectively, and the standard voltage output terminal, The output end of the feedback circuit is connected to one end of the sampling resistor; the two input ends of the feedback circuit are respectively connected to the two ends of the sampling resistor, and the output end is connected to the feedback voltage input end and the feedback voltage end of the differential amplifier circuit; the load The positive end of the interface is connected to the power supply end U I , and the negative end of the load interface is serially connected to one end of the sampling resistor; the positive and negative ends of the power supply U I are respectively connected to the positive and negative power supply ends of the differential amplifier circuit and the feedback circuit;
所述的双灯切换模块，由双灯并联电路、负载接口正端、负载接口负端、电压采样端2、继电器控制端和电源端UDL组成，双灯并联电路的一路由工作灯与继电器K串联，另一路由备用灯与场效应管Q串联；电源端UDL分别与继电器K的电源端、场效应管Q的栅极G连接；负载接口正端与工作灯、备用灯连接端连接，负载接口负端与继电器K的开关端、场效应管Q的漏极D、电压采样端2连接；继电器控制端与继电器K的控制端引出；The described dual-lamp switching module is composed of a dual-lamp parallel circuit, a positive terminal of the load interface, a negative terminal of the load interface, a voltage sampling terminal 2, a relay control terminal and a power supply terminal U DL . K is connected in series, and the other route standby lamp is connected in series with the field effect transistor Q; the power supply terminal U DL is respectively connected with the power supply terminal of the relay K and the gate G of the field effect transistor Q; the positive terminal of the load interface is connected with the working lamp and the standby lamp connection terminal. , the negative terminal of the load interface is connected to the switch terminal of the relay K, the drain D of the field effect transistor Q, and the voltage sampling terminal 2; the relay control terminal is connected to the control terminal of the relay K;
所述的电源模块，分别与处理控制、双灯切换和可控恒流源三个模块通过电源端连接，为其它三个模块提供所需的供电电压。The power supply module is respectively connected with the three modules of processing control, dual lamp switching and controllable constant current source through the power supply terminal, and provides the required power supply voltage for the other three modules.
可控恒流源模块的标准电压输入端与控制处理模块的标准电压输出端连接，反馈电压端与控制处理模块的电压采集端1连接，负载接口正负端与双灯切换模块的负载接口正负端连接；控制处理模块的电压采集端2、控制信号端分别与双灯切换模块的电压采样端2和继电器控制端连接，状态信号端和串行通讯端分别与外部控制器或上位机连接，向外部提供当前的工作状态。The standard voltage input terminal of the controllable constant current source module is connected to the standard voltage output terminal of the control processing module, the feedback voltage terminal is connected to the voltage acquisition terminal 1 of the control processing module, and the positive and negative terminals of the load interface are connected to the positive and negative terminals of the load interface of the dual-lamp switching module. The negative terminal is connected; the voltage acquisition terminal 2 and the control signal terminal of the control processing module are respectively connected with the voltage sampling terminal 2 and the relay control terminal of the dual lamp switching module, and the status signal terminal and the serial communication terminal are respectively connected with the external controller or the host computer. , which provides the current working status to the outside world.
所述的数字+模拟双闭环快速稳定恒流源电路，由可控恒流源模块、控制处理模块、双灯切换模块的一路有效负载、电源模块组成；可控恒流源模块的标准电压输入端与控制处理模块的标准电压输出端连接，反馈电压端与控制处理模块的电压采集端1连接，负载接口正负端与双灯切换模块的负载接口正负端连接；三个模块通过电源端与电源模块相连。The digital + analog double closed-loop fast and stable constant current source circuit is composed of a controllable constant current source module, a control processing module, a valid load of the dual lamp switching module, and a power supply module; the standard voltage input of the controllable constant current source module The terminal is connected to the standard voltage output terminal of the control processing module, the feedback voltage terminal is connected to the voltage collection terminal 1 of the control processing module, and the positive and negative terminals of the load interface are connected to the positive and negative terminals of the load interface of the dual-lamp switching module. Connect to the power module.
有益效果：本实用新型提出的数字+模拟双闭环电路，能快速稳定恒流源，解决了现有恒流驱动卤钨灯稳定时间长、恒流源调试过程复杂等问题；双灯故障控制检测+自动切换无须控制，当工作灯出现故障时，能够自动切换备用灯作为光源，避免了现有仪器采用控制机械开关进行备用灯切换时的开合抖动和过冲而影响电路工作不稳定现象；在系统非工作状态，还能够通过控制继电器的闭合与断开对两个灯分别进行故障检测。提高了工作效率，降低了使用成本和运行费用。Beneficial effects: the digital + analog double closed-loop circuit proposed by the utility model can quickly stabilize the constant current source, and solve the problems of long stabilization time of the existing constant current driven halogen tungsten lamp and complicated debugging process of the constant current source; double lamp fault control detection + The automatic switching does not need to be controlled. When the working light fails, the standby light can be automatically switched as the light source, which avoids the opening and closing jitter and overshoot when the existing instrument uses the control mechanical switch to switch the standby light, which affects the unstable circuit operation. In the non-working state of the system, fault detection can also be performed on the two lamps respectively by controlling the closing and opening of the relay. Improve work efficiency, reduce operating costs and operating costs.
附图说明Description of drawings
图1为双灯故障诊断自动切换的快速稳定恒流源系统结构框图。Figure 1 is a block diagram of a fast and stable constant current source system for automatic switching of dual-lamp fault diagnosis.
图2为附图1中控制处理模块结构框图。FIG. 2 is a structural block diagram of the control processing module in FIG. 1 .
图3为附图1中可控恒流源结构框图。FIG. 3 is a structural block diagram of the controllable constant current source in FIG. 1 .
图4为本发明双灯故障控制检测+自动切换电路图。FIG. 4 is a circuit diagram of dual lamp fault control detection + automatic switching according to the present invention.
具体实施方式Detailed ways
下面结合附图和实施例对本发明作进一步的详细说明：Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
本发明双光源故障诊断自动切换的快速稳定恒流源电路系统包括控制处理、可控恒流源、双灯切换、电源四个模块，如图1所示。The fast and stable constant current source circuit system for automatic switching of dual light source fault diagnosis according to the present invention includes four modules: control processing, controllable constant current source, dual lamp switching, and power supply, as shown in FIG. 1 .
一种双灯故障诊断自动切换的快速稳定恒流源系统，包括控制处理、可控恒流源、双灯切换和电源四个模块，电源模块分别连接控制处理模块、可控恒流源模块和双灯切换模块，四个模块分别组成数字+模拟双闭环快速稳定恒流源电路和双灯故障控制检测+自动切换两个功能电路；A fast and stable constant current source system for automatic switching of dual lamp fault diagnosis, comprising four modules of control processing, controllable constant current source, dual lamp switching and power supply, the power supply module is respectively connected to the control processing module, the controllable constant current source module and the power supply module. Dual lamp switching module, four modules respectively form digital + analog dual closed-loop fast and stable constant current source circuit and dual lamp fault control detection + automatic switching two functional circuits;
所述的控制处理模块，包括微处理器、标准电压输出端、电压采集端1、电压采集端2、控制信号端、状态信号端、串行通讯端、电源端UC组成，其中微处理器包括MPU、DAC、双通道ADC电路、串口、IO口；DAC通过IO口与标准电压输出端连接；双通道ADC通过IO口分别与电压采集端1、电压采集端2连接；串口与串行通信端口连接；控制信号端、状态信号端与微处理器的IO口连接；微处理器的电源口与电源端UC连接；The control processing module includes a microprocessor, a standard voltage output terminal, a voltage acquisition terminal 1, a voltage acquisition terminal 2, a control signal terminal, a status signal terminal, a serial communication terminal, and a power supply terminal U C , wherein the microprocessor is composed of Including MPU, DAC, dual-channel ADC circuit, serial port, IO port; DAC is connected with standard voltage output terminal through IO port; dual-channel ADC is connected with voltage acquisition terminal 1 and voltage acquisition terminal 2 respectively through IO port; serial port and serial communication Port connection; the control signal terminal and the status signal terminal are connected with the IO port of the microprocessor; the power port of the microprocessor is connected with the power supply terminal U C ;
所述的可控恒流源模块，由差分放大电路、采样电阻、反馈电路、标准电压输入端、反馈电压端、负载端、电源端UI组成，该模块为模拟闭环的恒流源电路，当标准电压输入端接入一标准电压，其输出的电流值为标准电压与采样电阻的比值，差分放大电路两个输入端：标准电压端和反馈电压端分别与标准电压输出端、反馈电路输出端相连，其输出端与采样电阻一端连接；反馈电路的2个输入端分别与采样电阻的两端相连，其输出端和差分放大电路的反馈电压输入端、反馈电压端连接；负载接口正端与电源端UI连接、负载接口负端与采样电阻一端串行连接；电源UI正负端分别与差分放大电路、反馈电路的正负供电端连接；The controllable constant current source module is composed of a differential amplifier circuit, a sampling resistor , a feedback circuit, a standard voltage input terminal, a feedback voltage terminal, a load terminal, and a power supply terminal UI. The module is an analog closed-loop constant current source circuit, When the standard voltage input terminal is connected to a standard voltage, the output current value is the ratio of the standard voltage and the sampling resistor. The two input terminals of the differential amplifier circuit: the standard voltage terminal and the feedback voltage terminal are respectively connected with the standard voltage output terminal and the feedback circuit output. The output end is connected to one end of the sampling resistor; the two input ends of the feedback circuit are respectively connected to the two ends of the sampling resistor, and the output end is connected to the feedback voltage input end and the feedback voltage end of the differential amplifier circuit; the positive end of the load interface It is connected with the power supply end U I , and the negative end of the load interface is connected in series with one end of the sampling resistor; the positive and negative ends of the power supply U I are respectively connected with the positive and negative power supply ends of the differential amplifier circuit and the feedback circuit;
所述的双灯切换模块，由双灯并联电路、负载接口正端、负载接口负端、电压采样端2、继电器控制端和电源端UDL组成，双灯并联电路的一路由工作灯与继电器K串联，另一路由备用灯与场效应管Q串联；电源端UDL分别与继电器K的电源端、场效应管Q的栅极G连接；负载接口正端与工作灯、备用灯连接端连接，负载接口负端与继电器K的开关端、场效应管Q的漏极D、电压采样端2连接；继电器控制端与继电器K的控制端引出；The described dual-lamp switching module is composed of a dual-lamp parallel circuit, a positive terminal of the load interface, a negative terminal of the load interface, a voltage sampling terminal 2, a relay control terminal and a power supply terminal U DL . K is connected in series, and the other route standby lamp is connected in series with the field effect transistor Q; the power supply terminal U DL is respectively connected with the power supply terminal of the relay K and the gate G of the field effect transistor Q; the positive terminal of the load interface is connected with the working lamp and the standby lamp connection terminal. , the negative terminal of the load interface is connected to the switch terminal of the relay K, the drain D of the field effect transistor Q, and the voltage sampling terminal 2; the relay control terminal is connected to the control terminal of the relay K;
所述的电源模块，分别与处理控制、双灯切换和可控恒流源三个模块通过电源端连接，为其它三个模块提供所需的供电电压。The power supply module is respectively connected with the three modules of processing control, dual lamp switching and controllable constant current source through the power supply terminal, and provides the required power supply voltage for the other three modules.
可控恒流源模块的标准电压输入端与控制处理模块的标准电压输出端连接，反馈电压端与控制处理模块的电压采集端1连接，负载接口正负端与双灯切换模块的负载接口正负端连接；控制处理模块的电压采集端2、控制信号端分别与双灯切换模块的电压采样端2和继电器控制端连接，状态信号端和串行通讯端分别与外部控制器或上位机连接，向外部提供当前的工作状态。The standard voltage input terminal of the controllable constant current source module is connected to the standard voltage output terminal of the control processing module, the feedback voltage terminal is connected to the voltage acquisition terminal 1 of the control processing module, and the positive and negative terminals of the load interface are connected to the positive and negative terminals of the load interface of the dual-lamp switching module. The negative terminal is connected; the voltage acquisition terminal 2 and the control signal terminal of the control processing module are respectively connected with the voltage sampling terminal 2 and the relay control terminal of the dual lamp switching module, and the status signal terminal and the serial communication terminal are respectively connected with the external controller or the host computer. , which provides the current working status to the outside world.
所述的数字+模拟双闭环快速稳定恒流源电路，由可控恒流源模块、控制处理模块、双灯切换模块的一路有效负载、电源模块组成；可控恒流源模块的标准电压输入端与控制处理模块的标准电压输出端连接，反馈电压端与控制处理模块的电压采集端1连接，负载接口正负端与双灯切换模块的负载接口正负端连接；三个模块通过电源端与电源模块相连。The digital + analog double closed-loop fast and stable constant current source circuit is composed of a controllable constant current source module, a control processing module, a valid load of the dual lamp switching module, and a power supply module; the standard voltage input of the controllable constant current source module The terminal is connected to the standard voltage output terminal of the control processing module, the feedback voltage terminal is connected to the voltage collection terminal 1 of the control processing module, the positive and negative terminals of the load interface are connected to the positive and negative terminals of the load interface of the dual-lamp switching module; the three modules are connected through the power terminal Connect to the power module.
控制处理模块采用stm32f103zet6微处理器和端口电路，如图2所示。微处理器内置有12位DAC和多通道ADC。端口电路包括标准电压输出端、电压采集端1、电压采集端2、控制信号端、状态信号端、串行通讯端、电源端UC共7个端口。微处理器的DAC输出端引出标准电压输出端，选用微处理器ADC的2个输入通道分别引出电压采集端1、电压采集端2，微处理器一个I/O口引出状态信号端标志系统是否处于稳流工作状态、一个I/O口引出控制信号端作为控制信号端用于双灯切换模块开关控制，串行通讯端引出作为系统与其他设备的通讯接口。通过电源端UC与电源模块连接，获得3.3V供电电压。The control processing module adopts stm32f103zet6 microprocessor and port circuit, as shown in Figure 2. The microprocessor has built-in 12-bit DAC and multi-channel ADC. The port circuit includes a standard voltage output terminal, a voltage acquisition terminal 1, a voltage acquisition terminal 2, a control signal terminal, a status signal terminal, a serial communication terminal, and a power supply terminal U C , a total of 7 ports. The DAC output end of the microprocessor leads to the standard voltage output end, and the two input channels of the microprocessor ADC are selected to lead to the voltage acquisition end 1 and the voltage acquisition end 2 respectively, and an I/O port of the microprocessor leads to the status signal end to mark whether the system is In a steady current working state, one I/O port leads out the control signal end as the control signal end for the switch control of the double lamp switching module, and the serial communication end leads out as the communication interface between the system and other devices. Connect to the power module through the power terminal U C to obtain a 3.3V power supply voltage.
可控恒流源如图3所示，由差分放大电路、采样电阻、反馈电路、标准电压输入端、反馈电压端、负载接口正负端、电源端UI组成。各部分的内部链接关系是：标准电压输入端与反馈电路输出端，作为输入引入差分放大电路，差分放大电路输出端与采样电阻一端连接；采样电阻两端与反馈电路的输入端连接，负载接口与采样电阻串行连接。其中标准电压输入端与控制处理模块的标准电压输出端连接，反馈电压端与控制处理模块的电压采集端1连接。负载接口正负端与双灯切换模块的负载接口正负端连接。通过电源端UI与电源模块连接，获得±12V供电电压。该模块为模拟闭环的恒流源电路，当标准电压输入端接入一标准电压，其输出的电流值为标准电压与采样电阻的比值。该模块与处理控制模块以及双灯切换模块的一路有效负载组成“数字+模拟双闭环”快速稳定恒流源。As shown in Figure 3, the controllable constant current source is composed of a differential amplifier circuit, a sampling resistor, a feedback circuit, a standard voltage input terminal, a feedback voltage terminal, the positive and negative terminals of the load interface, and the power supply terminal UI . The internal link relationship of each part is: the standard voltage input terminal and the output terminal of the feedback circuit are introduced into the differential amplifier circuit as input, and the output terminal of the differential amplifier circuit is connected to one end of the sampling resistor; the two ends of the sampling resistor are connected to the input terminal of the feedback circuit, and the load interface Connected in series with the sampling resistor. The standard voltage input terminal is connected to the standard voltage output terminal of the control processing module, and the feedback voltage terminal is connected to the voltage acquisition terminal 1 of the control processing module. The positive and negative ends of the load interface are connected with the positive and negative ends of the load interface of the dual-lamp switching module. Connect to the power module through the power terminal U I to obtain a ±12V power supply voltage. The module is an analog closed-loop constant current source circuit. When the standard voltage input terminal is connected to a standard voltage, the output current value is the ratio of the standard voltage to the sampling resistance. The module, the processing control module and the effective load of the dual lamp switching module form a "digital + analog double closed loop" fast and stable constant current source.
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