High voltage battery stack monitor enhances HEV/EV battery management systems
February 22, 2011 // Paul Buckley
Linear Technology has introduced a second generation high voltage battery monitor for hybrid/electric vehicle (HEVs), electric vehicles (EVs) and other high voltage, high performance battery systems. The LTC6803 is a complete battery measuring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface.
Each LTC6803 can measure up to 12 individual battery cells in series. The device’s proprietary design enables multiple LTC6803s to be stacked in series without optocouplers or isolators, permitting precision voltage monitoring of every cell in long strings of series-connected batteries. The LTC6803 follows the road-proven LTC6802, introduced in September 2008 with the same functionality and pinout, plus a number of performance enhancements.
The maximum total measurement error of the LTC6803 is guaranteed to be less than 0.25% from -40 to 125°C. The LTC6803 offers an extended cell measurement range from -300 mV to 5 V, enabling the LTC6803 to monitor a wide range of battery chemistries, as well as supercapacitors. Each cell is monitored for undervoltage and overvoltage conditions, and an associated MOSFET is available to discharge overcharged cells. Added functionality is provided by an onboard 5V regulator, temperature sensor, GPIO lines and thermistor inputs.
For long-term battery pack storage, the current consumed by the integrated BMS can potentially unbalance the cells. The LTC6803 addresses this concern with a standby mode that draws less than 12 µA. Furthermore, the power input of the LTC6803 is isolated from the stack, allowing the LTC6803 to draw current from an independent source. When powering from this input, the current draw on the pack is reduced to less than 1 µA.
The LTC6803 is designed to surpass the environmental, reliability and safety demands of automotive and industrial applications. The device is fully specified for operation from -40 to 125°C. The device has been engineered for ISO 26262 (ASIL) compliant systems and a full set of self-tests ensure that there are no latent fault conditions. To meet this standard, the LTC6803 includes a redundant voltage reference, extensive logic test circuitry, open wire detection capability and a watchdog timer for fail-safe designs. The LTC6803 is designed to withstand up to 75 V, providing more than 20% of overvoltage margin for a full string of 12 cells. The 1 MHz serial interface includes packet error checking and is designed to operate in the presence of large amounts of noise and transients.
The LTC6803 is now available in production quantities and is offered in a 8 mm x 12 mm surface mount device. The device is priced at $9.95 each in 1,000-piece quantities.
More information about the LTC6803 high voltage battery monitor at www.linear.com/6803
Never lose track of things
March 30, 2015
This month, DecaWave is offering EETimes Europe's readers the chance to win two TREK1000 kits to evaluate its Ultra-Wideband ...
Graphene's first commercial success: energy-saving light bulbs?
Nanolaser enables on-chip photonics
New cyber-physical systems as the basis for IoT: Europe has it all
1.5-A LDO plus regulator monitors current and temperature
Sensor data predict failure of large machines
March 29, 2015
Long before they actually fail, large machines exhibit signs of wear and tear. A team of researchers from the Saarland University ...
Big data sets drones to fly
CE marking misconceptions
Fraunhofer launches test centre for high-voltage batteries
- Intelligent Over Temperature Protection for LED Lighting Applications
- Intel helps to Turbocharge Infotainment Systems Designs
- High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own
- Software-Defined Radio Handbook
InterviewInfineon: CAN FD success goes at the expense of FlexRay
The faster version of the venerable CAN bus, CAN FD is currently taking off at several carmakers. Infineon's Thomas Böhm, Head of Body / Automotive, believes this could well go at the expense of FlexRay. ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Freescale is giving away 5 RIoTboards, worth 74 dollars each, for EETimes Europe's readers to win.
Designed to run Android operating systems efficiently or to run under Linux, the board is based on the Freescale i.MX 6Solo processor; using the ARM Cortex-A9 architecture.
The RIoTboard platform also includes a rich set of peripherals including a 10M/100M/Gb Ethernet port, 1...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.