a8259 可編程中斷控制 altera提供
The a8259 is designed to simplify the implementation of the interrupt interface in 8088 and 8086 based microcomputer systems. The device is known as a programmable interrupt controller. The a8259 receives and prioritizes up to 8 interrupts, and in the cascade mode, this can be expanded up to 64 interrupts. An asynchronous reset and a clock input have been added to improve operation and reliability.
為了提高直接轉(zhuǎn)矩控制(DTC)系統(tǒng)定子磁鏈估計(jì)精度,降低電流、電壓測量的隨機(jī)誤差,提出了一種基于擴(kuò)展卡爾曼濾波(EKF)實(shí)現(xiàn)異步電機(jī)轉(zhuǎn)子位置和速度估計(jì)的方法。擴(kuò)展卡爾曼濾波器是建立在基于旋轉(zhuǎn)坐標(biāo)系下由定子電流、電壓、轉(zhuǎn)子轉(zhuǎn)速和其它電機(jī)參量所構(gòu)成的電機(jī)模型上,將定子電流、定子磁鏈、轉(zhuǎn)速和轉(zhuǎn)子角位置作為狀態(tài)變量,定子電壓為輸入變量,定子電流為輸出變量,通過對磁鏈和轉(zhuǎn)速的閉環(huán)控制提高定子磁鏈的估計(jì)精度,實(shí)現(xiàn)了異步電機(jī)的無速度傳感器直接轉(zhuǎn)矩控制策略,仿真結(jié)果驗(yàn)證了該方法的可行性,提高了直接轉(zhuǎn)矩的控制性能。
Abstract:
In order to improve the Direct Torque Control(DTC) system of stator flux estimation accuracy and reduce the current, voltage measurement of random error, a novel method to estimate the speed and rotor position of asynchronous motor based on extended Kalman filter was introduced. EKF was based on d-p axis motor and other motor parameters (state vector: stator current, stator flux linkage, rotor angular speed and position; input: stator voltage; output: staror current). EKF was designed for stator flux and rotor speed estimation in close-loop control. It can improve the estimated accuracy of stator flux. It is possible to estimate the speed and rotor position and implement asynchronous motor drives without position and speed sensors. The simulation results show it is efficient and improves the control performance.
微電腦型RS-485顯示電表(24*48mm/48*96mm) 特點(diǎn): 5位數(shù)RS-485顯示電表 顯示范圍-19999-99999位數(shù) 通訊協(xié)議Modbus RTU模式 寬范圍交直流兩用電源設(shè)計(jì) 尺寸小,穩(wěn)定性高 主要規(guī)格: 顯示范圍:-19999~99999 digit RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通訊位址: "01"-"FF" RS-485通訊協(xié)議: Modbus RTU mode 顯示幕: Red high efficiency LEDs high 10.16 mm (0.4") (MMX-RS-11X) Red high efficiency LEDs high 20.32 mm (0.8") (MMX-RS-12X) Red high efficiency LEDs high 10.16 mm (0.4")x2 (MMX-RS-22X) 參數(shù)設(shè)定方式: Touch switches 記憶方式: Non-volatile E²PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/power) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
Logger iButton devices have gained a lot of popularity with researchers. Although free evaluation software is easy to use and welldocumented, the choices and inputs that need to be made can sometimes be challenging. This application note explains technicalterms that are common with temperature logger iButtons and how they relate to each other. Additionally, it presents an algorithm tohelp users choose the necessary input parameters, including the sample rate based on a user's needs and the available memory tostore the data.
Delta-sigma ADCs, with their high accuracy and high noiseimmunity, are ideal for directly measuring many typesof sensors. Nevertheless, input sampling currents canoverwhelm high source impedances or low-bandwidth,micropower signal conditioning circuits. The LTC®2484family of delta sigma converters solves this problem bybalancing the input currents, thussimplifying or eliminatingthe need for signal conditioning circuits.
在集成電路內(nèi)建自測試的過程中,電路的測試功耗通常顯著高于正常模式產(chǎn)生的功耗,因此低功耗內(nèi)建自測試技術(shù)已成為當(dāng)前的一個(gè)研究熱點(diǎn)。為了減少被測電路內(nèi)部節(jié)點(diǎn)的開關(guān)翻轉(zhuǎn)活動(dòng)率,研究了一種隨機(jī)單輸入跳變(Random Single Input Change,RSIC)測試向量生成器的設(shè)計(jì)方案,利用VHDL語言描述了內(nèi)建自測試結(jié)構(gòu)中的測試向量生成模塊,進(jìn)行了計(jì)算機(jī)模擬仿真并用FPGA(EP1C6Q240C8)加以硬件實(shí)現(xiàn)。實(shí)驗(yàn)結(jié)果證實(shí)了這種內(nèi)建自測試原理電路的正確性和有效性。