Week #8: Discussion results

Week #8: Discussion resultsContinue battery management

Group #33Group member:

Tianhao HanXimeng Sun(Susie)

Xing Cao(Star)Zhuoran Yang

A simple bidirectional 2-wire busAim to lightweight communication & efficient

inter-IC controlall i2c-bus compatible devices can

communicate directly with each other through(via) the i2c-bus

Each device connected to the bus is software addressable

Masters can operate as master-transmitters or as master-receivers

Up to 100 kbit/s in the standard-mode, 3.4Mbit/s in the high-speed mode(ultra 5 Mbit/s)

SMBus (SMB)System Management Bus:It is a single-ended simple two-wire bus for the purpose of lightweight communication.

SMBus, defined by Intel in 1995, is a subset of I²C that defines the protocols more strictly.

One purpose of SMBus is to promote robustness and interoperability.

SMBus has a “High Power” version 2.0 that includes a 4 mA sink current that cannot be driven by i2c.

The SMBus clock is defined from 10-100kHz while i2c can be 0-100kHz, 0-400kHz, 0-1MHz and 0-3.4MHz, depending on the mode.

SMBus defines a clock low time-out, which is 35ms. I2c doesn’t specify any timeout limit.

SMBus defines both rise and fall time of bus signals. I2c does not.

The SMBus uses i2c hardware and i2c hardware addressing, but adds second-level software for building special systems.

SMBus has a time-out feature which resets devices if a communication takes too long.

HDQA single-wire serial data interfaceHose controllers,configured for either polled or interrupt

processinguse the interface to access various IC

registers use command-based protocol

Impedance Track™ Measured impedance of the battery’s cells

as a key input to its remaining capacity predictions

I2C Protocol

Pull up resistor

Pull up resistor

DefinitionPull-up resistors are used in electronic logic

circuits to ensure that inputs to logic systems settle at expected logic levels if external devices are disconnected or high-impedance. They may also be used at the interface between two different types

of logic devices, possibly operating at different power supply voltages.

Why I2C needs R(pull-up)The pins on the chips are of

open-collector design.

Measure the current LTC4151: High Voltage I2C Current and

Voltage Monitor

Measure the current Required external components: A sense resistor (Shunt) Two bus pull-up resistors A resistive divider for 5V measurement on ADIN.

Measure the current Current shunt monitor: INA209 --

TI

HDQ vs I2CSave one interface which

connected to battery. Since some of the interfaces are gilded, HDQ could save costs.

I2C is more convenience on software driver.

I2c has a quicker transfer speed.

Wireless Charge Battery

What is Wireless chargeWireless charge also know as

inductive charge. Uses an Electromagnetic field to

transfer energy between two objects. Energy is sent through Inductive coupling to an electrical device, which then can use that energy to charge batteries or run the device.

Advantage of wireless charge 1:Lower risk of electrical shock or

shorting out when wet. 2: Protected connections

3: Safer for medical implants

4:Convenience

In the futureInvisible implant to table

Charging Panel

Table Surface

This is a big market for TI !

Original

ImprovingController

Inductor Wire Connect

Chip

BQ500210EVM-689Input maximum 20V

Thermo cutoff

Useless of my idea

Battery management on Green energyThe most acceptable kinds of green energy are

solar, thermal, kinetic and fuel cell. We will illustrate all of them respectivly as following:

Solar: We can add a battery management product before or after the green battery. After the solar energy goes through the panels, it can fulfill different functions either before or after the storage boards.

Battery management on Green energy

For solar panel, there is a huge market all over the world. For example, a company named HAQ SOLAR has a product “50w solar panel”. For this product, the open circuit voltage is 26.53(v), which is pretty low so that we can add TI’s products on this panel to reduce the power consumption as well as improve the power efficiency.

Battery management on Green energyThermal: Thermal energy is a part of total internal energy of a thermodynamic system or sample of matter that results in the system temperature. There is an article mentioned “Exploiting thermal energy as a source of power for biomedical applications has become the subject of a great deal of research in recent years”

Battery management on Green energy “In the future, a casual mention of ‘the patch’ might

not be a reference to the nicotine patch many smokers use now to try to kick their habit. Through their research on self-powered systems, a team of researchers is exploring thermal energy harvesting to advance the development of body-worn sensor patches that monitor physiological conditions. Body-worn devices can record glucose levels or provide ECG monitoring, for example. They also exhibit a great deal of promise for future detection and monitoring applications.”

Battery management on Green energy “But the lifespan of these devices, like many

products, is often limited by battery life.” “While thermal energy harvesting demonstrates

potential for powering wearable sensors, harnessing vibration energy, on the other hand, could someday power implantable devices”. The market will be very promising with the growing of technology.

Battery management on Green energyKinetic: For Kinetic energy, we have an idea: we

can put TI’s products in Led Self-generating Flashlights. It can extend the battery life span by lower the power consumption, and protect the battery itself in the flashlights. We can even add Led screens on the flashlights to actually show how much battery left.

Battery management on Green energyFuel Cell: A fuel cell is a device that converts the

chemical energy from a fuel into electricity through a chemical reaction with oxygen or another oxidizing agent. Hydrogen is the most common fuel cells. Fuel cells are different from batteries in that they require a constant source of fuel and oxygen to run, but they can produce electricity continually for as long as these inputs are supplied.

Battery management on Green energyA good example for application is the Fuel cell

electric vehicles (FCEVs). Over 20 FCEVs prototypes and demonstration cars have been released since 2009. Demonstration models include the Honda FCX Clarity, Toyota FCHV-adv, and Mercedes-Benz F-Cell.

In 2010, fuel cell industry revenues exceeded a $750 million market value worldwide.

Green EnergySolar light / lantern

Green EnergySolar charger.

Green EnergyHybrid Electric Vehicle

Question time.

Thank you for your listening!