为适应双向DC/DC功率变换的电流采样需求,一种高精度高边电流采样电路被提出。其基本思想是在功率电路的高边串入采样电阻,借助电流镜原理并引入偏置电流电路,将双向电流均转换为正向电压输出。通过理论分析与仿真结合的方法对电流镜采样原理及4种不同的偏置电流电路方案进行对比,最后通过实验数据验证了高精度高边电流采样电路的有效性。实验数据表明,该采样电路可在-25~75℃的温度工作范围内,针对-10~＋10 A范围内的电流采样实现优于5%的采样精度。Current sensing plays an important role in controlling,monitoring or protection functions of power systems.To meet the current sensing requirement of bidirectional DC/DC converters,a high-accuracy bidirectional current sensing circuit is proposed.The proposed current sensing circuit inserts a resistor in the path of the current to be sensed,while the current mirror and biased current circuit are introduced.Therefore,the bidirectional current can be expressed by positive voltage.By theoretical analysis and simulation,the sampling theory is analyzed and four biased current circuits are compared.At last,experimental results verified the proposed method.It is demonstrated that the proposed current sensing circuit can achi...
上传时间： 2022-04-22
上传用户：
该步进电机驱动器又称为EasyDriver，EasyDriver能够为两级步进电机提供大约每相750mA（两极一共1.5A）的驱动。它默认设置为8步细分模式（所以如果你的电机是每圈200步，你使用EasyDriver时默认为每圈1600步），更多细分模式可以通过将MS1或MS2两个接脚接地进行设置。这是一种基于Allegro A3967驱动芯片的细分断路器。对于此设计的完整规格，请查阅A3967的参数表。它的最大每相电流从150mA到750mA。可以采用的最大驱动电压大概是30V，其中包括板载5V的调压器，所以只需要一个电源。质优价廉，这玩意儿只要十几美元，比你自己制作电路板更便宜。步进电机驱动器设计特色：· A3967 Microstepping Driver· MS1 and MS2 pins broken out to change microstepping resolution to full, half, quarter and eighth steps (defaults to eighth)· Compatible with 4, 6, and 8 wire stepper motors of any voltage· Adjustable current control from 150mA/phase to 700mA/phase· Power supply range from 6V to 30V. The higher the voltage, the higher the torque at high speeds
上传时间： 2022-04-27
上传用户：
STM32 F0系列 MCU 集成库 原理图库 PCB封装库文件CSV text has been written to file : STM32 F0.csvLibrary Component Count : 17Name Description----------------------------------------------------------------------------------------------------STM32F050C4T6A ARM Cortex-M0 32-bit RISC core (48 MHz max), 16kB Flash, 4 kB Internal RAM, 39 High Current I/Os, -40 to +85癈, 48-Pin LQFP, TraySTM32F050C6T6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 32kB Flash, 4 kB Internal RAM, 39 High Current I/Os, -40 to +85癈, 48-Pin LQFP, TraySTM32F050C6T6A ARM Cortex-M0 32-bit RISC core (48 MHz max), 32kB Flash, 4 kB Internal RAM, 39 High Current I/Os, -40 to +85癈, 48-Pin LQFP, TraySTM32F050K4U6A ARM Cortex-M0 32-bit RISC core (48 MHz max), 16kB Flash, 4 kB Internal RAM, 27 High Current I/Os, -40 to +85癈, 32-Pin UFQFPN, TraySTM32F050K6U6A ARM Cortex-M0 32-bit RISC core (48 MHz max), 32kB Flash, 4 kB Internal RAM, 27 High Current I/Os, -40 to +85癈, 32-Pin UFQFPN, TraySTM32F051C4T6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 16kB Flash, 4 kB Internal RAM, 39 High Current I/Os, -40 to +85癈, 48-Pin LQFP, TraySTM32F051C6T6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 32kB Flash, 4 kB Internal RAM, 39 High Current I/Os, -40 to +85癈, 48-Pin LQFP, TraySTM32F051C8T6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 64kB Flash, 8 kB Internal RAM, 39 High Current I/Os, -40 to +85癈, 48-Pin LQFP, TraySTM32F051K4U6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 16kB Flash, 4 kB Internal RAM, 27 High Current I/Os, -40 to +85癈, 32-Pin UFQFPN, TraySTM32F051K6U6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 32kB Flash, 4 kB Internal RAM, 27 High Current I/Os, -40 to +85癈, 32-Pin UFQFPN, TraySTM32F051K8U6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 64kB Flash, 8 kB Internal RAM, 27 High Current I/Os, -40 to +85癈, 32-Pin UFQFPN, TraySTM32F051R4T6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 16kB Flash, 4 kB Internal RAM, 55 High Current I/Os, -40 to +85癈, 64-Pin LQFP, TraySTM32F051R4T6TR ARM Cortex-M0 32-bit RISC core (48 MHz max), 16kB Flash, 4 kB Internal RAM, 55 High Current I/Os, -40 to +85癈, 64-Pin LQFP, Tape and ReelSTM32F051R6T6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 32kB Flash, 4 kB Internal RAM, 55 High Current I/Os, -40 to +85癈, 64-Pin LQFP, TraySTM32F051R8T6 ARM Cortex-M0 32-bit RISC core (48 MHz max), 64kB Flash, 8 kB Internal RAM, 55 High Current I/Os, -40 to +85癈, 64-Pin LQFP, TraySTM32F051R8T7 ARM Cortex-M0 32-bit RISC core (48 MHz max), 64kB Flash, 8 kB Internal RAM, 55 High Current I/Os, -40 to +105癈, 64-Pin LQFP, TraySTM32F051R8TR ARM Cortex-M0 32-bit RISC core (48 MHz max), 64kB Flash, 8 kB Internal RAM, 55 High Current I/Os, -40 to +105癈, 64-Pin LQFP, Tape and Reel
上传时间： 2022-04-30
上传用户：
基于PSIM仿真软件，分析了Boost电路拓扑结构，设定了参数要求进行电路仿真设计，通过电路仿真软件PSIM对Boost电路工作在CCM模式下，合理设置占空比参数。实验结果表明理论分析与仿真的一致性和参数设计的正确性，输出电压和电流参数稳定，Boost电路输出效率高。This design is based on PSIM simulation software,analyzes the topology of Boost circuit,sets the parameter re- quirements for circuit simulation design,and reasonably sets the duty cycle parameters for Boost circuit working in CCM mode through PSIM simulation software.The experimental results show that the theoretical analysis and simulation are consis- tent and the parameter design is correct,the output voltage and current parameters are stable.
上传时间： 2022-05-04
上传用户：
The JW® 7805 is a low noise low-dropout (LDO) voltage regulator with enable function that operates from 1.8V to 5.5V. It provides up to 300mA of output current and offers low-power operation in miniaturized packaging. JW7805 supports fixed output voltage 0.9V, 1.0V, 1.05V, 1.1V,1.2V, 1.3V, 1.35V, 1.5V, 1.8V, 1.85V, 2.1V, 2.2V, 2.3V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V,3.1V, 3.3V, 3.6V, 4.2V, 4.4V and 5.0V. The features of low quiescent current as low as 6uA and almost zero disable current are ideal for powering the battery equipment. JW7805’s low output noise and high PSRR are also friendly to RF systems.
标签： JW7805
上传时间： 2022-05-06
上传用户：slq1234567890
基于DSP28335的永磁同步电机调速系统设计摘要（中英文） 本控制系统的设计是为了实现基于TMS320F28335的永磁同步电动机的调速系统，并把它引用到全电动注塑机当中。本系统使用SVPWM的控制方法，通过采样电机电流和旋转变压器的位置信息，实现速度、电流双闭环控制。通过TMS320F28335的硬件浮点处理核心，实现应用于永磁同步电机的浮点算法，去取代过去的定点算法，提高代码效率。 Abstract: The control system is designed to realize TMS320F28335 based on the permanent magnet synchronous motor speed control system, and put it to quoting all electric of injection molding machine. The ystem of the control method used SVPWM, through the sampling motor current and rotating transformer 1. 引言1.1 设计背景及目的 本永磁同步电机调速系统是全电动注塑机的其中一个应用部分。全电动注塑机凭借着其节约能源、清洁、噪声少、速度控制效果好、精度高、可重复性高、成本低等众多优点，成为了当下高端注塑机发展的一个方向。 全电动注塑机的所有运动机构都采用交流伺服电动机驱动，一个稳定高效的永磁同步电动机驱动方案成为了全电动注塑机性能的一个总要部分。本次设计以适用于全电动注塑机的永磁同步电动机控制系统为目标进行设计，采用TI公司的TMS320F28335作为控制核心。凭借TMS320F28335高速的运算能力，适用于电动机控制的各种外设，以及TMS320F283XX特有的硬件浮点运算能力，进行永磁同步电动机的调速控制系统的设计。
上传时间： 2022-05-08
上传用户：
If register should be written or read.This value is passed to the calback functions which support either reading or writing register values. Writing means that the application registers should be updated and reading means that the modbus protocol stack needs to know the current register values.See also: eMBRegHoldingCB(), eMBRegCoilsCB(), eMBRegDiscreteCB() and eMBReglnputCB().Enumeration values: MB_REG_READ Read register values and pass to protocol stack.MB_REG_WRITE Update register values.Note: Note all ports implement this function.A port which wants to get an callback must define the macro MB_PORT_HAS_CLOSE to 1.Returns: If the resources where released it return eMBErrorCode:: MB_ENOERR. If the protocol stack is not in the disabled state it returns eMBErrorCode:: MB_EILLSTATE.Examples: LINUX/demo.c, MCF5235TCP/demo.c, STR71XTCP/demo.c, WIN32/demo. cpp, and WIN32TCP/demo. cpp.his function disables processing of Modbus frames.Returns: If the protocol stack has been disabled
标签： FreeModbus
上传时间： 2022-05-31
上传用户：
#include "NUC1xx.h"#include "Hal.h"#include "pwm.h"//wait current PWM cycle done, otherwise there maybe short pulse on FETvoid PWM_Stop(U8 ch){ switch(ch) { case PWM_CHANNEL_A: PWMA->u32CNR1 = 0; PWMA->u32CMR1 = 0; while(PWMA->u32PDR1 != 0); break; case PWM_CHANNEL_B: PWMA->u32CNR2 = 0; PWMA->u32CMR2 = 0; while(PWMA->u32PDR2 != 0); break; case PWM_CHANNEL_C: PWMA->u32CNR3 = 0; PWMA->u32CMR3 = 0; while(PWMA->u32PDR3 != 0); break; default: while(1); } PWMA->u32POE &= ~(1<<ch); PWMA->u32PCR &= ~(1<<(ch*8));}
上传时间： 2022-06-01
上传用户：kingwide
RX-8801 SA Features built-in 32.768 kHz DTCXO, High Stability Supports l'C-Bus's high speed mode (400 kHz)Alarm interrupt function for day, date, hour, and minute settings Fixed-cycle timer interrupt function Time update interrupt function32.768 kHz output with OE function Auto correction of leap years Wide interface voltage range: 2.2 V to 5.5 V Wide time-keeping voltage range:1.8 V to 5.5 V Low current consumption: 0.84A/3V (Typ.)is an IC bus interface-compliant real-time clock which includes a 32.768 kHz DTCXO In addition to providing a calendar (year, month, date, day, hour, minute, second) function and a clock counter function, this module provides an abundance of other functions including an alarm function, fixed-cycle timer unction, time update interrupt function, and 32.768 kHz output function.The devices in this module are fabricated via a C-MOS process for low current consumption, which enables ong-term battery back-up.
上传时间： 2022-06-17
上传用户：
DescriptionThe IMX385LQR-C is a diagonal 8.35 mm (Type 1/2) CMOS active pixel type solid-state image sensor with a squarepixel array and 2.13 M effective pixels. This chip operates with analog 3.3 V, digital 1.2 V, and interface 1.8 V triplepower supply, and has low power consumption. High sensitivity, low dark current and no smear are achieved throughthe adoption of R, G and B primary color mosaic filters. This chip features an electronic shutter with variablecharge-integration time.(Applications: Surveillance cameras)
标签： CMOS传感器 IMX385LQR-C
上传时间： 2022-06-18
上传用户：
