Peter B. Green, head of the International Rectifier (IR) LED division, recently pointed out that the offline LED power supply market is mainly divided into high-power and low-power parts, which are roughly divided into 50W, excluding low-voltage applications such as handheld devices. The development of LED replacement bulbs and other new LED lighting is very rapid, and the main market tends to be offline LED lighting power.
Lamp replacements based on integrated LEDs mostly use a simple, non-isolated buck regulator LED driver circuit. These products use the fewest component count and lowest cost, but must also provide enough lumens per watt, and a power factor higher than 0.7, with standard triac dimmer dimming ability. Products that are not meeting market performance requirements are gradually being replaced, and the US Department of Energy's Energy Star program is one of the reasons for this change.
High power LED drivers typically require insulation isolation to meet UL standards. This often requires a power factor greater than 0.9 and dimming capability, which may be achieved by methods other than the base dimmer. There is also a need to produce at least the same lumens per watt of fluorescent light and a longer lifetime.
Allan Lin, general manager of Diodes' LED lighting business unit, believes that the development of off-line LED lighting power will change the LED sales angle, from low-current, high-brightness LEDs (for mobile phones, signs and laptops) that sell large quantities of DC/DC power supplies. , to the sale of higher current LEDs (usually lighting applications) for AC/DC power supplies. This will increase the overall general lighting AC/DC LED driver market and increase the need for lower cost power components.
LED backlighting TVs and other large LCD TV applications are also welcoming other development spaces. They are moving from CCFL to LEDs, further driving the market for higher current LEDs, higher voltage power supplies, and increasing the demand for higher power LEDs that drive many large parallel chains.
Lithium Ion Battery For Electric Golf Cart
Advantages of Lithium Golf Batteries
Lithium golf batteries (or LiFePO4 batteries) have been around for a while now on electric golf buggies, but until recently have been quite expensive. Most brands now including MGI Golf, Autocaddy, Motocaddy and Powakaddy come standard with lithium ion batteries. But not only can you get a lithium battery for a new golf buggy, there are suppliers providing them for older buggies by running on the same voltage as a lead acid battery.
Below is a breakdown of the advantages of a lithium golf battery over their lead acid counterparts:
Greater life expectancy
The main advantage of a lithium battery is the life expectancy. Whilst a lead acid battery will last around 300 cycles, a lithium battery can last up to 5000 cycles, meaning over the life of the battery a lithium is more cost effect per round of golf. Lithium batteries are maintenance free and have the benefit of a control board built in, thus ensuring worry free golfing.
Light weight
Another advantage is in the weight of the battery. A lithium battery weights on average 5 times less than a similar amp-hour lead acid battery. This makes it easier to lift making it easier to transport to other golf courses. The lighter weight also puts less strain on your buggy and therefore less wear and tear over time. This will improve the life of your buggy and mean less repairs will be required.
Short Charge Times
Charging times are also reduced when using lithium batteries over lead acid. Whilst it can take over 8 hours to charge a lead acid battery, a lithium battery can be fully charged in less than 3 hours. Lithium batteries are also able to be left off charge for longer periods of time compared to a lead acid battery. Once fully charged your lithium battery can be left off charge for up to 3 months before any damage occurs, whilst a lead acid battery will start to sulphide within 3 weeks.
Low Maintenance
Lithium batteries (Li-Ion batteries) require less maintenance than most forms of batteries. Other batteries, such a lead acid, require a periodic discharge to maintain the battery memory. This is not required for Lithium batteries, which can be left off charge for up to 3 months (once fully charged).
Lithium batteries also do not require topping up, like older forms of lead acid batteries. This means there is less maintenance required and less that can go wrong.
So there you have it, a lithium golf battery will not only last longer than a lead acid battery, but will save you time and money over its life.
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