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High Voltage Regulator – 48V DC Output from 125V DC Input

The project published here is a high-voltage adjustable regulator with an output 48 V DC from an input supply of 125V DC. The circuit is capable to drive load current up to 500mA. This regulator circuit designed for use in high-voltage applications where standard bipolar regulators cannot be used. Excellent performance specifications, superior to those of most bipolar regulators, are achieved through circuit design and advanced layout techniques. As a state-of-the-art regulator, the TL783 device combines standard bipolar circuitry with high-voltage double diffused MOS transistors on one chip, to yield a device capable of withstanding voltages far higher than standard bipolar integrated circuits. Because of its lack of secondary-breakdown and thermal-runaway characteristics usually associated with bipolar outputs, the TL783 maintains full overload protection while operating at up to 125 V from input to output. Other features of the device include current limiting, safe-operating-area (SOA) protection, and thermal shutdown.

Even if ADJ is disconnected inadvertently, the protection circuitry remains functional. Only two external resistors are required to program the output voltage. An input bypass capacitor is necessary only when the regulator is situated far from the input filter. An output capacitor, although not required, improves transient response and protection from instantaneous output short circuits. Excellent ripple rejection can be achieved without a bypass capacitor at the adjustment terminal. Output voltage fixed 48V DC but it is adjustable by changing the value of resistor value R6, refer to datasheet for the formula to choose the appropriate value of R6. LT783 and transistors require a large size heat sink.

Features

Supply Input: 70V to 125V DC
Output: 48V DC
Output Current 500mA
PCB Dimensions 57 x 33mm

Schematic

Parts List

Photos

TL783 Datasheet

Video

ESP8266 based Coronavirus tracking project

Posted on 21 March, 2020 by mixos

This is an ESP8266 based coronavirus tracking project from “Volkan Unal” on github.com. The tracker can be configured to display the details of your own country.

Instructions

1- Change your wifi information from WifiConnect.h file

char ssid[32] = "yourssid"; char password[64] = "yourpass";

2- Define your country code from corona.ino file

#define country_code "yourcountrycode"

GET (https://coronavirus-19-api.herokuapp.com/countries) -> all countries info

STO1000E 150MHz Battery-Powered Portable Oscilloscopes

Posted on 20 March, 202020 March, 2020 by mixos

Micsig’s STO1000E 2/4-channel oscilloscopes include 70Mpts memory, 1GSa/s sampling, 130,000wfm/s refresh rate, and a 7.5Ah Li battery for extended field use.

Saelig Company, Inc. has introduced the Micsig STO1000E PLUS series of two- and four-channel battery-powered portable oscilloscopes, which offer bandwidths of up to 150MHz. The three models in the series are: STO1102E PLUS 2-channel 100MHz, STO1152E PLUS 150MHz 2-channel, and STO1104E PLUS 4-channel 100MHz. Each oscilloscope includes 70Mpts memory, 1GSa/s sampling (single channel), 130,000wfm/s refresh rate, and a 7.5Ah Li battery for extended field use.

These innovative portable instruments are a development of Micsig’s range of tablet oscilloscopes and combine an 8” touch screen (touch, drag, and swipe) with ‘button & knob’ operation. An external USB mouse can also be connected for additional control choices, with an internal software pop-up keyboard provided for data entry. The built-in HDMI output adds educational and demonstration possibilities, and an auto-calibration function ensures measurement accuracy. Sophisticated waveform triggering techniques include: Edge, Pulse Width, Logic, Video, Runt, Time Out , Nth Edge, Slopetime, and Serial Decode. A screen capture button provides a quick way of saving waveform images for later review or report writing.

Included as standard are two P130A 200MHz x10 passive probes and an external 12V power adapter. STO1000E PLUS oscilloscopes can make 31 types of automatic measurements, and decode a selection of serial protocols, including UART, CAN, LIN, SPI, I2C, 1553B, and ARINC429. I/O provisions include Wi-Fi, LAN, HDMI, USB Host, USB Device, DC Power, and Aux out. 8GB of internal data storage is included for data files that can be transferred to a PC via a USB connection, LAN, or WiFi.

The oscilloscope features a built-in prop stand for easy viewing. When the oscilloscope is connected to a LAN or WiFi network, live screen images can be transmitted to an external projector. The scope can also be remotely PC-controlled via WiFi, LAN, or USB, and also via an Android mobile device.

Made by Shenzhen-based Micsig, a leading provider of battery-powered portable and handheld oscilloscopes since 2004, the STO1000E series of oscilloscopes are available now from Saelig Company, Inc., Fotric’s authorized North American distributor.

15W Quasi-Resonant Flyback AC-DC Power Supply – Reference Design

Posted on 20 March, 2020 by mixos

The STEVAl-ISA171V1 reference design from STMicroelectronics implements a 15 W ac-dc power supply designed in quasi-resonant flyback topology for a wide-range input voltage. Its key features are its small size and minimal bill of material, high efficiency and low standby consumption.

The core of the application is the VIPER35, the quasi-resonant offline high voltage converter from the VIPerPLUS product family.

The VIPER35 integrates an 800 V rugged power MOSFET with pwm current-mode control.

Extremely low consumption under no-load conditions is ensured thanks to burst mode operation that reduces the average switching frequency and minimizes all frequency-related losses.

The VIPER35 operates in quasi resonant mode, a feature that helps to meet the EMI standards.

Key Features:

Wide input voltage range: 90- to 264-Vac
Output voltage: 12V
Output current: 1.25A
Rated output power: 15W
Quasi resonant operation
Input power standby at 230Vac: < 30mW
Active mode efficiency: >82%
EMI: pre-compliance with EN55022-Class-B
RoHS compliant

On The Web: STMicroelectronics NV

Advantech Launches Medical-Grade AVAS-400 Series 4K UHD Video Recorder

Posted on 20 March, 202020 March, 2020 by mixos

Advantech, a leading provider of medical computing platforms and solutions, is pleased to announce its AVAS-400 Series medical-grade 4K ultra high-definition (UHD) video recorder aimed at ensuring operating precision.

Advantech’s AVAS-400 Series, including the model AVAS-401 and the model AVAS-402, is ideal for surgery centers, operating rooms, and training facilities that use 4K UHD cameras and display monitors for surgical operations and post-surgery reviews and research. To achieve the visual accuracy and precision required for medical applications, the AVAS-400 Series can be used to capture video at 4K UHD resolution. This video can then be streamed to connected displays for monitoring and reviewing surgical procedures.

4K UHD True-to-Life Surgical Video Recorder for Enhanced Imaging

For surgical procedures, the ability to support 4K UHD video streaming is extremely important. This is because 4K UHD video streaming provides surgeons with an unprecedented level of detail that allows them to distinguish between tissue, blood vessels, and other anatomy. Thus, the use of AVAS-400 Series can give surgeons an extra level of confidence. Moreover, the enhanced visual information and clarity provided by 4K UHD technology can also assist post-surgery evaluations and lead to improvements in patient care.

Furthermore, the provision of open APIs and SDKs ensures easy integration with existing infrastructure and management systems to enable intelligent operating rooms and achieve intelligent healthcare. Finally, compared to other recorders available on the market, the AVAS-400 Series offers an economical imaging solution that is easy to deploy and operate via the intuitive controls.

Key Features

Supports 4K resolution and simultaneous recording of two video channels
Video signals can be recorded to the internal hard disk drive
Integrated USB drive and network server
Programmable hotkeys offer more efficient control
Supports Windows and Linux operating systems
CE, FCC, EN60601-1, UL-60601-1, and CCC Certification

Advantech’s AVAS-400 Series 4K UHD video recorder is available for order now. For more information regarding the AVAS-400 Series video recorder or other Advantech Digital Healthcare products and solutions, contact your local sales representative or visit the Advantech website.

An affordable edge-computing device for high-performance and power-efficient robotics automation

Posted on 20 March, 2020 by mixos

Industrial automation offers greater quality control, flexibility and safety for manufacturing. snickerdoodle is a customisable, affordable, palm-sized device that minimises the time, effort and cost of setting up industrial robotics.

Older manufacturing systems lack the benefits of new digital sensing and connectivity technologies (robotics and Internet of Things). But upgrading infrastructure necessitates building hardware-software platforms and customising for performance, power and component integration requirements. This involves significant capital and personnel investments, planned well in advance. These investments need to be weighed against the risks of manufacturing downtime, avoidable equipment damage and process inefficiencies. Under the snickerdoodle project, krtkl (pronounced ‘critical’) created the first, full-stack development board for robotic systems. This houses a central ‘brain’ for various manufacturing component and subsystem connectivity, integration, control and monitoring operations. As the underlying hardware is software reconfigurable, snickerdoodle simplifies the challenge of enabling interfaces for a wide array of sensors, actuators and communication protocols. This offers operators easy-to-understand information and control options. EU SME Instrument funding enabled the project to complete a feasibility assessment and a go-to-market strategy and establish a manufacturing supply chain.

Simplified implementation and development time

snickerdoodle is comprised of multiple processors, software which can be customised by end users who can program the built-in FPGA and wireless connectivity. All this is contained in a device the size of a business card. The main processor runs general purpose and/or real-time operating systems to take care of higher-level tasks, such as machine-to-machine networking or motor control loops. The programmable logic, or FPGA (the ‘brain’), allows both customisation of a system’s inputs and outputs, ranging from interfacing with motors and sensors to becoming a pure video-processing machine. This can be useful in production line monitoring, or computer vision, for example. The FPGA also runs complex control and data-processing algorithms. The system has built-in Wi-Fi and Bluetooth to make integration with modern networks more straightforward. “After years of working in mechatronics and embedded systems, developing one-off solutions for companies to bring new automation products to market, it became obvious that what was needed was a central ‘brain’. This needed to be quickly and easily adaptable to meet the requirements of each specific application,” explains project coordinator Ryan Cousins.

From factories to footwear

After extensive thermal, environmental and endurance testing (on site and in emissions labs), and design simulations (using engineering software), krtkl has developed industrial-grade versions of the technology, available on demand. The commercial version of snickerdoodle and other parts of the development platform (piSmasher and breakyBreaky) are currently available on Mouser for worldwide, same-day shipment. The hardware will also be made available on Amazon later this year. Current commercial uses include real-time motor control and path planning for industrial robotics (six-axis robotic arm for furniture assembly, painting and inspection); low-power/high-endurance remote sensing (oil/gas/utilities), and data collection and processing for preventative maintenance (factory automation). Additionally, the whole snickerdoodle system (including breakyBreaky, piSmasher, enclosures, accessories, etc.) has been used in commercial- and consumer-grade products that have obtained formal FCC certification.

“We’ve seen snickerdoodle used in everything from industrial automation to smart retail and e-sports accessories. We launched with almost no outside capital – something very few people believed was possible. We foresee it touching the lives of many people – even if they never know it exists,” says Cousins.

The team is working on upgrading the device to make it compatible with the latest silicon technologies. This will accommodate cutting-edge applications, such as higher-resolution video processing, artificial intelligence and machine learning, and other computationally intensive uses.

source: cordis.europa.eu

Interfacing BMP280 Pressure Sensor Module with Arduino

Project Goal: To measure the atmospheric pressure using one of the best modules i,e BMP280 Pressure sensor module.

Components Used in the Project:

Arduino Uno
BMP280
Connecting Wires
LCD 16 X2

BMP280 Pressure Sensor Module

The BMP280 sensor module operates with the minimum voltage (VDD) of 1.71V, However, the previous version of this sensor modules operate on 1.8V (VDD). The BMP sensor includes a Pressure sensing element, Humidity sensing element as well as Temperature sensing element which is then attached to Pressure front-end, Humidity front-end and temperature front-end.

These front end IC’s are sensitive analog amplifiers that are utilized in the process of the amplifying of small signals. In this integration, the analog values are turned to digital signal and this voltage is supplied to the logic circuits for further interface.

The BMP280 can be also utilized in mobile phones, tablets, PCs, Portable health care devices, GPS devices, home weather stations, etc. By using this procedure we can simply interface BMP280 with the Arduino.

Schematic

Code

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_BMP280.h>
#include <LiquidCrystal.h>
Adafruit_BMP280 bmp; // I2C
//Adafruit_BMP280 bmp(BMP_CS); // hardware SPI
//Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);
LiquidCrystal lcd(9, 8, 5, 4, 3, 2);
void setup() {
  lcd.begin(16,2);
  Serial.begin(9600);
  Serial.println(F("BMP280 test"));
  lcd.print("Welcome to ");
  lcd.setCursor(0,1);
  lcd.print("CIRCUIT DIGEST");
  delay(1000);
  lcd.clear();
  if (!bmp.begin()) {
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring!"));
    while (1);
  }
  /* Default settings from datasheet. */
  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
                  Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
                  Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
                  Adafruit_BMP280::FILTER_X16,      /* Filtering. */
                  Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
}
void loop() {
    Serial.print(F("Temperature = "));
    Serial.print(bmp.readTemperature());
    Serial.println(" *C");
    lcd.setCursor(0,0);
    lcd.print("Temp= ");
    lcd.print(bmp.readTemperature());

    Serial.print(F("Pressure = "));
    Serial.print(bmp.readPressure());
    Serial.println(" Pa");
    lcd.setCursor(0,1);
    lcd.print("Press= ");
    lcd.print(bmp.readPressure());
    Serial.print(F("Approx altitude = "));
    Serial.print(bmp.readAltitude(1018)); /* Adjusted to local forecast! */
    Serial.println(" m");
    Serial.println();
    delay(2000);
}

Demo

Avalue introduces EMX-WHLGP, a 8th Gen Intel® Whiskey Lake U Core™ SoC i7/i5/i3 Thin MINI ITX motherboard

Posted on 19 March, 2020 by mixos

Avalue Technology Inc., a global industrial PC solution provider and an associate member of the Intel® Internet of Things Solutions Alliance, is unveiling EMX-WHLGP, based on Whiskey Lake U Intel® Core™ and Celeron® Processors.

The 8th Gen Intel® Whiskey Lake U Core™ SoC i7/i5/i3 & Celeron® BGA onboard processor, leverage the power efficiency of 14nm microarchitecture to deliver double-digit performance compare to the KabyLake Refresh, offers a future-proof platform for intelligent solution development and higher turbo clocks.

EMX-WHLGP, the Thin Mini ITX Motherboard, offering Triple display: two HDMI plus one HDMI switch with one dual-channel LVDS (default LVDS) by Chrontel CH7511 in the resolution of 1920*1080, ideal for all-in-one PC, POS, Digital Signage, and kiosk markets.

Meanwhile, EMX-WHLGP features extended temperature tolerance -20°C~+60°C (with heatsink and heater attached, 0.5 m/s air flow speed testing) and fanless design, which is suitable for industrial and outdoor application under harsh operating conditions. It is designed with high temperature resistant components and automatically heating by EC and heater when operating temperature is below 0°C, which takes around 8 to 10 minutes for EMX-WHLGP to boot up from -20°C. Heatsink with heater for extended temperature is optional for ordering. For customer who does not require extended temperature support, Avalue also offer finished product which support 0°C~+60°C.

EMX-WHLGP main features:

Onboard 8th Gen Intel® Whiskey Lake U Core™ SoC i7/i5/i3 & Celeron®BGA Processor
Two 260-pin DDR4 2400 MHz SO-DIMM socket, supports up to 32GB Max (non ECC only)
2 x HDMI + 1 x HDMI/Dual-channel LVDS (default LVDS); Triple display (HDMI+HDMI+LVDS)
1 x Intel® I219LM Gigabit Ethernet PHY, 2 x Intel® I210IT PCI-e Gigabit Ethernet (Co-lay Intel® I211AT/I210AT)
Realtek ALC892 Audio Codec & TI TPA3113D2PWP Stereo Class-D 6W x 2 Audio Amplifier
1 x SATA III, 1 x SATA Power, 4 x USB 2.0, 3 x USB 3.1 Gen1, 1 x USB Type C without DP Signal
4 x RS232, 2 x RS232/422/485, 16-bit GPIO
1 x M.2 Key A 2230 support WiFi module ( 1 x PCI-e x 1 & USB 2.0 Signal), 1 x M.2 Type B 3042/2242/2260/2280 support WWAN+GNSS or SSD with 1 x SIM card slot
Support Line-out & Mic-in & Front audio pin-header, Onboard TPM 2.0
DC in +12~24V
Operating Temp -20°C~+60°C (with heatsink and heater attached, 0.5 m/s air flow speed testing)

Additionally, EMX-WHLGP provides more flexibilities and expansions as below, making it an ideal solution for versatile industrial applications. Such as, PCI-e x 8 Golden Finger offers 1 x PCI-e x 1, 1 x PCI-e x 4, 1 x SATA III, and 1 x USB 2.0. The customers can either design their own daughter board easily, or transform the form factor into uATX by connecting with a Riser card.

Visit www.avalue.com.tw for more information on Avalue products, or contact sales@avalue.com.tw to talk to our sales team.

PD Micro – A Pro Micro with USB-C Power Delivery

Posted on 19 March, 2020 by mixos

PD Micro is the first Arduino-compatible board with USB-C power delivery. The pins are compatible with Pro micro. PD Micro allows you to control high voltage easily from USB-C Power delivery. It’s useful for applications that require voltage higher than 5V – like motor control or a high-power LED.

New USB-C Power Delivery Library

PD Micro is accompanied by our newly-implemented, simple, compact, USB-C power delivery library. This was written over the course of porting the code for PD Micro. We ended up writing a library completely from scratch. The result is a simple, compact, portable source code for USB-C device only application, which can be put inside ATmega328/ATmega32U4.

Specifications:

Microcontroller: ATmega32U4 running at 5V/16MHz
Voltage Regulator: TPS62175 DC-DC for efficient 5-20V to 5V
USB-C PHY: FUSB302 (USB PD communication on CC pins)
ESD protection on D+/D-/CC1/CC2 pins
Pinout: (pin compatible to Pro Micro)
- 9x 10-bit ADC pins
- 12x Digital I/Os (INT and I2C bus are shared with FUSB302)
- 5x GND pins
- 3x VBUS pins (USB-C power)
- 1x 5V pin (DC-DC output)
Status LEDs:
- TX / RX
- 5 LED for Power Delivery voltage level
- 3 LED for Power Delivery current level
Reset button
USB-C port for programming and power delivery
3.5 mm 2 pos Terminal Jack for power output
Four layer PCB with ground plane and 3 mm wide VBUS trace
Size: 1.6 x 0.7 inches (extra 0.3 inches for power connector pins)

Features:

Set power delivery voltage output level by updating code through Arduino IDE
New USB Power delivery protocol library for UFP(device):
- Written from draft, not base on any existing library
- Simple, size optimized, more than half of RAM and Code space in ATmega32 are available to user
- Highly portable code
- Fully open source

The project will soon launch on www.crowdsupply.com, stay tuned.

Fundamentals of MOSFET and IGBT Gate Driver Circuits

Posted on 18 March, 2020 by mixos

The main purpose of this application report is to demonstrate a systematic approach to design high-performance gate drive circuits for high-speed switching applications. It is an informative collection of topics offering a “one-stop-shopping” to solve the most common design challenges. Therefore, it should be of interest to power electronics engineers at all levels of experience. The most popular circuit solutions and their performance are analyzed, including the effect of parasitic components, transient and extreme operating conditions. The discussion builds from simple to more complex problems starting with an overview of MOSFET technology and switching operation. Design procedure for ground referenced and high side gate drive circuits, AC coupled and transformer isolated solutions are described in great details. A special section deals with the gate drive requirements of the MOSFETs in synchronous rectifier applications. For more information, see the Overview for MOSFET and IGBT Gate Drivers product page.

Several, step-by-step numerical design examples complement the application report.

Fundamentals of MOSFET and IGBT Gate Driver Circuits – [PDF]