Friday, September 27, 2013

Digital Humidity and Temperature Sensor SHT71

Versatile and Replaceable Digital humidity sensor, a cost-effective component. In the SHT family the capacitive humidity sensors are fully calibrated and provides a digital output ready for interface.

Digital Humidity and Temperature Sensor SHT71

Each SHT7x is individually calibrated in a precision humidity chamber. The calibration coefficients are programmed into an OTP memory on the chip. These coefficients are used to internally calibrate the signals from the sensors. The 2-wire serial interface and internal voltage regulation allows for easy and fast system integration.

Digital Humidity and Temperature Sensor SHT71

The power consumption of around 80uW makes it ideal for battery operated devices. It measures the full span of  0-100% RH with a response time of 8 sec. The temperature range being -40 - +125°C.

Humidity Sensor SHT71 Schematic

SCK is used to synchronize the communication between microcontroller and SHT7x. The DATA tri-state pin is used to transfer data in and out of the sensor.

Sensirion is the leading manufacturer of high-quality sensors and sensor solutions for the measurement and control of humidity, and of gas and liquid flows.

Sensirion AG
Laubisruetistrasse 50, 8712 Staefa ZH, Switzerland.

Monday, August 26, 2013

High-Voltage High-Power IGBT

IGBT module from  Hitachi. The new IGBT module makes high energy efficiency and silent operation of inverters possible. It has High thermal fatigue durability. It is a High speed and low loss IGBT module.

High-Voltage High-Power IGBT

Low noise due to soft and fast recovery diode. The driving power is less as the MOS gate input capacitance is very low. The modules are very reliable and durable. The heatsink has a Isolation between terminals and base.

High-Voltage High-Power IGBT - Hitachi

From 1700V to 6500V,  High Power Density, Low Inductance, Scalable, Easy Paralleling, Standard and High Isolation Package.

The Hitachi Power Semiconductor Devices mark a new era of Power electronics by High-Power IGBT modules, High-Voltage ICs and Power diodes.

Friday, August 16, 2013

WARP Speed IGBT - International Rectifier

IGBTs are voltage-controlled power transistors, that have higher current densities than equivalent high-voltage power MOSFETs.

WARP Speed IGBT - International Rectifier

IRG4PC40W -TO-247AC
Features Include
  • 2 to 2.5 times the current density of MOSFETs
  • Lower conduction losses at equivalent current rating compared to MOSFETs
  • Reduced current tail for high frequency operation
  • "Positive-only" gate drive
IRG4PC40W - 600V Warp 60-150 kHz Discrete IGBT in a TO-247AC package

Lower switching losses allow more cost-effective operation than power MOSFETs up to 150 kHz ("hard switched" mode)  

Of particular benefit to single-ended converters and boost PFC topologies 150W and higher 

Low conduction losses and minimal minority-carrier recombination make these an excellent option for resonant mode switching as well (up to >>300 kHz)  

WARP Speed IGBT - International Rectifier
The IGBT in TO-247 delivers the same efficiency at full loadas the MOSFET in the larger TO-247 package.

Wednesday, July 3, 2013

DC to AC Inverter - 500W - International Rectifier

DC to AC inverter converts DC voltage to a pure sinusoidal output voltage. This is used for UPS, solar inverters and frequency converters. This design operates without fan up to 500W.

DC to AC Inverter - 500W - International Rectifier

A full bridge topology is used to implement the DC to AC inverter. The switching frequency of the high side and low side IGBTs are 20 kHz and 60 Hz, respectively. This switching technique produces 60 Hz AC sine wave across the output capacitor.

DC to AC Inverter - 500W - International Rectifier

The Key IR Power Semiconductors are
  • IRGB4062DPBF (600V/24A Trench IGBT) High Side IGBTs 
  • IRG4BC20SD-PBF (600V/10A S-type Planar IGBT) Low Side IGBTs 
  • IRS2106S (600V half bridge driver IC)
One of the Benefits of the H bridge topology and switching technique.

"IGBTs are driven using high voltage gate driver IC with bootstrap technique. There is no separate floating power supply required for the high side drive. Bootstrap capacitors for these drivers get refreshed every switching cycle (50 usec) when current freewheels on the low side IGBTs copackage diodes."

Friday, May 10, 2013

iDVM a Wireless DMM - Redfish Instruments

A digital multimeter that wirelessly transmits voltage, current and resistance measurements via an 802.11 wifi connection to any Android device for enhanced visualization, data sharing, and data logging.

iDVM a Wireless DMM - Redfish Instruments 

Users can acquire data, save it, email it, post it to a web server, or display it for further visualization. Using the integrated speech function, the iDVM can “speak” the measurement through your Phone or Tablet.


The iDVM lte allows data taken by any Fieldpiece accessory head to be wirelessly transmitted to your iOS or Android smart phone or tablet computer.


The iDVM will permits you to measure voltage, current, and resistance from up to 30 yards away while still logging the data. Once you've captured the data you can use the many attributes of your Android devices to pinch, scroll, pan, and zoom your data.

Redfish Instruments, Inc.
303 Potrero Street, Suite 42-304 Santa Cruz, CA 95060

Thursday, January 17, 2013

MSP430F417 LCD Kits - Elektronikladen

MSP430F417 has more flash and RAM. These are able to control up to 96 segments of an LCD. This technique of using the MSP430 demonstrates how easily low-power applications can be developed for viewing and measuring instruments.

MSP430F417 LCD Kits - Elektronikladen

MSP430F41 Kit at Elektronikladen

Features
  • MSP430F413 or MSP430F417 controller (LQFP64)
  • 5-digit LCD display with additional functions
  • 32kHz watch crystal
  • RS232 level converter and DB-9 connector
  • two buttons - Sounder - Status LED
  • Connections for Dallas touch button
  • 14-pin. JTAG port
  • Dimensions: 80mm x 50mm
  • Battery holder for 3V LiMn cell (not supplied)
Elektronikladen - Mikrocontroller Starterkits

Elektronikladen - ELMICRO offers a wide range of Evaluation Boards, Controller Modules and Software Development Tools. The company network was founded in 1975 in Detmold, Germany and operates a network of partners and sales representatives to support customers world-wide.