為適應雙向DC/DC功率變換的電流采樣需求,一種高精度高邊電流采樣電路被提出。其基本思想是在功率電路的高邊串入采樣電阻,借助電流鏡原理并引入偏置電流電路,將雙向電流均轉換為正向電壓輸出。通過理論分析與仿真結合的方法對電流鏡采樣原理及4種不同的偏置電流電路方案進行對比,最后通過實驗數據驗證了高精度高邊電流采樣電路的有效性。實驗數據表明,該采樣電路可在-25~75℃的溫度工作范圍內,針對-10~＋10 A范圍內的電流采樣實現優于5%的采樣精度。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...
上傳時間： 2022-04-22
上傳用戶：
該步進電機驅動器又稱為EasyDriver，EasyDriver能夠為兩級步進電機提供大約每相750mA（兩極一共1.5A）的驅動。它默認設置為8步細分模式（所以如果你的電機是每圈200步，你使用EasyDriver時默認為每圈1600步），更多細分模式可以通過將MS1或MS2兩個接腳接地進行設置。這是一種基于Allegro A3967驅動芯片的細分斷路器。對于此設計的完整規格，請查閱A3967的參數表。它的最大每相電流從150mA到750mA。可以采用的最大驅動電壓大概是30V，其中包括板載5V的調壓器，所以只需要一個電源。質優價廉，這玩意兒只要十幾美元，比你自己制作電路板更便宜。步進電機驅動器設計特色：· 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
上傳時間： 2022-04-27
上傳用戶：
STM32 F0系列 MCU 集成庫 原理圖庫 PCB封裝庫文件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
上傳時間： 2022-04-30
上傳用戶：
基于PSIM仿真軟件，分析了Boost電路拓撲結構，設定了參數要求進行電路仿真設計，通過電路仿真軟件PSIM對Boost電路工作在CCM模式下，合理設置占空比參數。實驗結果表明理論分析與仿真的一致性和參數設計的正確性，輸出電壓和電流參數穩定，Boost電路輸出效率高。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.
上傳時間： 2022-05-04
上傳用戶：
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.
標簽： JW7805
上傳時間： 2022-05-06
上傳用戶：slq1234567890
基于DSP28335的永磁同步電機調速系統設計摘要（中英文） 本控制系統的設計是為了實現基于TMS320F28335的永磁同步電動機的調速系統，并把它引用到全電動注塑機當中。本系統使用SVPWM的控制方法，通過采樣電機電流和旋轉變壓器的位置信息，實現速度、電流雙閉環控制。通過TMS320F28335的硬件浮點處理核心，實現應用于永磁同步電機的浮點算法，去取代過去的定點算法，提高代碼效率。 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 設計背景及目的 本永磁同步電機調速系統是全電動注塑機的其中一個應用部分。全電動注塑機憑借著其節約能源、清潔、噪聲少、速度控制效果好、精度高、可重復性高、成本低等眾多優點，成為了當下高端注塑機發展的一個方向。 全電動注塑機的所有運動機構都采用交流伺服電動機驅動，一個穩定高效的永磁同步電動機驅動方案成為了全電動注塑機性能的一個總要部分。本次設計以適用于全電動注塑機的永磁同步電動機控制系統為目標進行設計，采用TI公司的TMS320F28335作為控制核心。憑借TMS320F28335高速的運算能力，適用于電動機控制的各種外設，以及TMS320F283XX特有的硬件浮點運算能力，進行永磁同步電動機的調速控制系統的設計。
上傳時間： 2022-05-08
上傳用戶：
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
標簽： FreeModbus
上傳時間： 2022-05-31
上傳用戶：
#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));}
上傳時間： 2022-06-01
上傳用戶：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.
上傳時間： 2022-06-17
上傳用戶：
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)
標簽： CMOS傳感器 IMX385LQR-C
上傳時間： 2022-06-18
上傳用戶：
