ME8321原边反馈QR准谐振控制器技术详解

开关电源
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"ME8321原边反馈QR准谐振恒压恒流.pdf" ME8321是一款专为离线式小功率开关电源设计的高性能、高效率控制器，适用于6W以内的能效六级应用。它采用准谐振（QR）模式和原边反馈（PSR）技术，旨在提高电源转换效率并降低电磁干扰（EMI）。ME8321内置1A/650V的高压功率MOSFET，以满足高效能和低功耗的要求，特别适合5W充电器的设计，且支持"No-snubber&No-Y"方案，简化了电路设计。 该芯片的主要特性包括： 1. 能源之星6级能效合规，确保了出色的能源利用效率。 2. QR模式与PSR结合，提高工作效率，同时减小EMI。 3. 内置线损补偿机制，保证恒压（CV）输出的精度为±5%。 4. 支持低至100mW的待机功耗，有助于节能。 5. 集成了前沿消隐、逐周期电流限制、软启动等功能，增强系统稳定性。 6. 提供VDD过/欠电压保护、输出电压过压保护和输出过流保护，确保安全运行。 7. 使用SOP-7封装，节省空间，易于布局。 8. 包含过温保护功能，防止芯片过热。 ME8321的管脚定义如下： 1. VDD：芯片电源，需要外接10uF电解电容供电。 2. FB：电压反馈输入，通过辅助绕组监控输出电压。 3. COMP：恒流管理，用于原边电流检测，连接到100nF电容接地。 4. CS：电流检测，作为原边电流检测脚。 5, 6. DRAIN：内置MOSFET的漏极，连接到变压器原边绕组。 7. GND：芯片地线，应连接到输入地。 功能框图展示了ME8321内部的电路结构，包括控制电路、反馈电路、保护电路等。 调试时需注意以下几点： - VDD供电脚的启动电流低，启动电压阈值为15.5V，关断电压9.5V，OVP电压35V。推荐VCC辅助绕组电压设定在18V以内，使用10uF电解电容。 这款芯片广泛应用于电池充电器（如手机、无绳电话、PDA和数码相机）、小功率适配器以及AC/DC LED照明等领域，能够替代传统的线性变压器和RCC电路，提升整体电源系统的性能和效率。

基于UCC28610的QR反激准谐振开关电源设计.pdf

2019-09-17 上传
基于UCC28610的QR反激准谐振开关电源设计pdf,基于UCC28610的QR反激准谐振开关电源设计

基于UCC28610的QR反激准谐振开关电源设计

2013-04-27 上传
基于UCC28610的QR反激准谐振开关电源设计

ME8327B原边反馈恒压恒流.pdf

2019-09-13 上传
ME8327B原边反馈恒压恒流pdf,ME8327B原边反馈恒压恒流，能效六12W控制器

你看这个代码#!/usr/bin/env python3 import os import sys import cv2 from pyzbar import pyzbar def main(image_folder_path, output_file_name): img_files = [f for f in os.listdir(image_folder_path) if f.endswith(('.png'))] qr_codes_found = [] print("Image files:") for img_file in img_files: print(img_file) for img_file in img_files: img_path = os.path.join(image_folder_path,img_file) img = cv2.imread(img_path) barcodes = pyzbar.decode(img) for barcode in barcodes: if barcode.type == 'QRCODE': qr_data = barcode.data.decode("utf-8") qr_codes_found.append((img_file, qr_data)) with open(output_file_name,'w') as f: for file_name,qr_content in qr_codes_found: f.write(f"{file_name}: {qr_content}\n") if __name__ == "__main__": image_folder_path = '/home/lk' output_file_name = 'qr_codes_found.txt' main(image_folder_path,output_file_name)他最后得到的文本结果是什么啊

2023-07-13 上传
根据你提供的代码，它会在指定的图像文件夹中查找以`.png`结尾的图像文件，并使用pyzbar库解码其中的QR码。找到的QR码内容将以`qr_codes_found.txt`为文件名保存在指定路径下的文本文件中。 请注意，由于我是一个...

#!/usr/bin/env python3 import os import sys import cv2 from pyzbar import pyzbar def main(image_folder_path, output_file_name): img_files = [f for f in os.listdir(image_folder_path) if f.endswith(('.png'))] qr_codes_found = [] for img_file in img_files: img_path = os.path.join(image_folder_path,img_file) img = cv2.imread(img_path) barcodes = pyzbar.decode(img) for barcode in barcodes: if barcode.type == 'QRCODE': qr_data = barcode.data.decode("utf-8") qr_codes_found.append((img_file, qr_data)) with open(output_file_name,'w') as f: for file_name,qr_content in qr_codes_found: f.write(f"{file_name}: {qr_content}\n") if name == "main": image_folder_path = 'home' output_file_name = 'qr_codes_found.txt' main(image_folder_path,output_file_name) 运行后报错FileNotFoundError: [Errno 2] No such file or directory: 'home'

2023-07-12 上传
qr_codes_found.append((img_file, qr_data)) with open(output_file_name,'w') as f: for file_name,qr_content in qr_codes_found: f.write(f"{file_name}: {qr_content}\n") if __name__ == "__main__": ...

#!/usr/bin/env python2.7 # -*- coding: UTF-8 -*- import rospy from sensor_msgs.msg import Image from cv_bridge import CvBridge import cv2 import os from pyzbar import pyzbar def image_callback(msg): # 将ROS图像消息转换为OpenCV图像 bridge = CvBridge() frame = bridge.imgmsg_to_cv2(msg, desired_encoding='bgr8') # 执行生成文本的逻辑 image_folder_path = '/root/Pictures' output_file_name = '/root/Pictures/qr_codes_found.txt' main(image_folder_path, output_file_name) def main(image_folder_path, output_file_name): img_files = [f for f in os.listdir(image_folder_path) if f.endswith('.png')] qr_codes_found = [] print("Image files:") for img_file in img_files: print(img_file) for img_file in img_files: img_path = os.path.join(image_folder_path, img_file) img = cv2.imread(img_path) barcodes = pyzbar.decode(img) for barcode in barcodes: if barcode.type == 'QRCODE': qr_data = barcode.data.decode("utf-8") qr_codes_found.append((img_file, qr_data)) unique_qr_codes = [] for file_name, qr_content in qr_codes_found: if qr_content not in unique_qr_codes: unique_qr_codes.append(qr_content) with open(output_file_name, 'w') as f: for qr_content in unique_qr_codes: f.write("{}\n".format(qr_content)) if __name__ == '__main__': rospy.init_node('text_generation_node') # 创建一个订阅器订阅图像消息 rospy.Subscriber('processed_image', Image, image_callback) rospy.spin() 如何让这个代码生成的文本变为excel文件

2023-07-17 上传
for i, qr_content in enumerate(unique_qr_codes, start=1): sheet.cell(row=i, column=1).value = qr_content # 保存工作簿为Excel文件 wb.save(output_file_name) if __name__ == '__main__': rospy.init_...

decoded_qr_codes = pyzbar.decode(gray) for qr_code in decoded_qr_codes: print("QR code data: ", qr_code.data) pub.publish(qr_code.data) 保存解码后的二维码数据到文件 file_path = "/home/shuju/decoded_qr_codes.txt" # 文件路径和名称 with open(file_path, "w") as file: for qr_code in decoded_qr_codes: file.write(qr_code.data.decode("utf-8") + "\n") pub.publish(qr_code.data) 原先解码代码如上，现需要更改为如下新代码，如何更改，给出源码： import cv2 import time rtsp_url = "rtsp://192.168.42.142:8554/live" def write_data_to_file(name, data): with open(name, "wb") as fd: fd.write(data) return len(data) return -1 def image_callback(handler, frmdata, frmsize, width, height, pixfmt): print(f"Image {frmsize}@{frmdata} -- {width}x{height} -- {pixfmt}") if frmdata: t = int(time.time() * 1000) if t - ts > 1000: ts = t name = f"pictures/{width}x{height}-{pixfmt}_{counter}.jpg" if pixfmt == 5: write_data_to_file(name, frmdata) def main(rtsp_url): ts = int(time.time() * 1000) service = cv2.VideoCapture(rtsp_url) counter = 0 while True: ret, frame = service.read() if not ret: break t = int(time.time() * 1000) if t - ts > 1000: ts = t counter += 1 name = f"pictures/{frame.shape[1]}x{frame.shape[0]}-5_{counter}.jpg" cv2.imwrite(name, frame, [int(cv2.IMWRITE_JPEG_QUALITY), 80]) service.release() print("done.") if __name__ == "__main__": main(rtsp_url)

2023-07-16 上传
print("QR code data: ", qr_code.data) pub.publish(qr_code.data) # 保存解码后的二维码数据到文件 file_path = "/home/shuju/decoded_qr_codes.txt" with open(file_path, "w") as file: for qr_code in ...

#!/usr/bin/env python2.7 -- coding: UTF-8 -- import time import cv2 from PIL import Image import numpy as np from PIL import Image import os import sys from pyzbar import pyzbar def main(image_folder_path, output_file_name): img_files = [f for f in os.listdir(image_folder_path) if f.endswith(('.png'))] qr_codes_found = [] print("Image files:") for img_file in img_files: print(img_file) for img_file in img_files: img_path = os.path.join(image_folder_path,img_file) img = cv2.imread(img_path) barcodes = pyzbar.decode(img) for barcode in barcodes: if barcode.type == 'QRCODE': qr_data = barcode.data.decode("utf-8") qr_codes_found.append((img_file, qr_data)) unique_qr_codes = [] for file_name, qr_content in qr_codes_found: if qr_content not in unique_qr_codes: unique_qr_codes.append(qr_content) with open(output_file_name,'w') as f: for qr_content in unique_qr_codes: f.write("{}\n".format(qr_content)) if name == 'main': rtsp_url = "rtsp://127.0.0.1:8554/live" cap = cv2.VideoCapture(rtsp_url) # 判断摄像头是否可用 # 若可用，则获取视频返回值ref和每一帧返回值frame if cap.isOpened(): ref, frame = cap.read() else: ref = False # 间隔帧数 imageNum = 0 sum = 0 timeF = 24 while ref: ref, frame = cap.read() sum += 1 # 每隔timeF获取一张图片并保存到指定目录 # "D:/photo/"根据自己的目录修改 if (sum % timeF == 0): # 格式转变，BGRtoRGB frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) # 转变成Image frame = Image.fromarray(np.uint8(frame)) frame = np.array(frame) # RGBtoBGR满足opencv显示格式 frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR) imageNum = imageNum + 1 cv2.imwrite("/root/Pictures/Pictures" + str(imageNum) + '.png', frame) print("success to get frame") # 1毫秒刷新一次 k = cv2.waitKey(1) # 按q退出 # 如果按下的是q键，则退出循环 if k == ord('q'): cap.release() image_folder_path = '/root/Pictures' output_file_name = 'qr_codes_found.txt' main(image_folder_path,output_file_name)无法生成所需文本

2023-07-14 上传
qr_codes_found.append((img_file, qr_data)) unique_qr_codes = [] for file_name, qr_content in qr_codes_found: if qr_content not in unique_qr_codes: unique_qr_codes.append(qr_content) with open...

将#!/usr/bin/env python2.7 -- coding: UTF-8 -- import time import cv2 from PIL import Image import numpy as np from PIL import Image if name == 'main': rtsp_url = "rtsp://127.0.0.1:8554/live" cap = cv2.VideoCapture(rtsp_url) #判断摄像头是否可用 #若可用，则获取视频返回值ref和每一帧返回值frame if cap.isOpened(): ref, frame = cap.read() else: ref = False #间隔帧数 imageNum = 0 sum=0 timeF = 24 while ref: ref,frame=cap.read() sum+=1 #每隔timeF获取一张图片并保存到指定目录 #"D:/photo/"根据自己的目录修改 if (sum % timeF == 0): # 格式转变，BGRtoRGB frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) # 转变成Image frame = Image.fromarray(np.uint8(frame)) frame = np.array(frame) # RGBtoBGR满足opencv显示格式 frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR) imageNum = imageNum + 1 cv2.imwrite("/root/Pictures/Pictures" + str(imageNum) + '.png', frame) print("success to get frame") #1毫秒刷新一次 k = cv2.waitKey(1) #按q退出 #if k==27：则为按ESC退出 if k == ord('q'): cap.release() break和#!/usr/bin/env python2.7 coding=UTF-8 import os import sys import cv2 from pyzbar import pyzbar def main(image_folder_path, output_file_name): img_files = [f for f in os.listdir(image_folder_path) if f.endswith(('.png'))] qr_codes_found = [] print("Image files:") for img_file in img_files: print(img_file) for img_file in img_files: img_path = os.path.join(image_folder_path,img_file) img = cv2.imread(img_path) barcodes = pyzbar.decode(img) for barcode in barcodes: if barcode.type == 'QRCODE': qr_data = barcode.data.decode("utf-8") qr_codes_found.append((img_file, qr_data)) unique_qr_codes = [] for file_name, qr_content in qr_codes_found: if qr_content not in unique_qr_codes: unique_qr_codes.append(qr_content) with open(output_file_name,'w') as f: for qr_content in unique_qr_codes: f.write("{}\n".format(qr_content)) if name == "main": image_folder_path = '/root/Pictures' output_file_name = 'qr_codes_found.txt' main(image_folder_path,output_file_name)合并成一个代码

2023-07-14 上传
qr_codes_found.append((img_file, qr_data)) unique_qr_codes = [] for file_name, qr_content in qr_codes_found: if qr_content not in unique_qr_codes: unique_qr_codes.append(qr_content) with ...

# ... def image_callback(msg): # 将ROS图像消息转换为OpenCV图像 bridge = CvBridge() frame = bridge.imgmsg_to_cv2(msg, desired_encoding='bgr8') # 执行生成文本的逻辑 image_folder_path = '/root/Pictures' output_file_name = 'qr_codes_found.txt' main(image_folder_path, output_file_name) # ...这段代码加在哪里

2023-07-14 上传
qr_codes_found.append((img_file, qr_data)) unique_qr_codes = [] for file_name, qr_content in qr_codes_found: if qr_content not in unique_qr_codes: unique_qr_codes.append(qr_content) with open...
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