High Efficiency Bridgeless Single Power Conversion Battery Charger for Light Electric Vehicles
Charging batteries of light electric vehicles require chargers with high efficiency and a high power factor. To meet this need, this paper presents a bridgeless single-power-conversion battery charger composed of an isolated step-up ac-dc converter with a series-resonance circuit. The bridgeless configuration reduces the conduction losses associated with the input diode rectifier, and the series-resonance circuit reduces the reverse-recovery losses of the output diodes by providing zero-current switching. In addition, direct and series-resonance current injections enable bidirectional core excitation by the transformer, thereby allowing high-power capability. The control algorithm derived from feedback linearization is also developed, which allows the proposed charger to correct the power factor and regulate the output power in a single-stage power conversion. This simple circuit structure leads to high efficiency and a high power factor. The theoretical concepts of the proposed charger are verified experimentally using a 1.7-kW prototype.
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Test charging my Kona using both the Granny cable (ICCB) supplied with the car and my Zappi charger.
Rates, times and efficiency. Additional test including an extension lead in front of the ICCB.
For accuracy I charged the car to an even 10% boundary before starting, letting the car cut off using the charge limit feature. For each test I again used the charge limit to charger just 10% . This seemed to be the most accurate way to compare multiple charges methods.
Of note the plug of the extension cord was quite warm, not hot but definitely warmer than that of the Granny cable on its own.
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Charlie Zhao – Applications Section Leader, Power Products
Today’s battery chargers are expected to support a variety of battery chemistries and accept a range of input voltages. In many applications, the input voltage range can vary from below the output battery voltage to above the battery voltage, requiring both step-down and step-up capability. In this video, we will show how the LTC4020 controller meets these challenges, how it works and its main features.
The LTC4020 buck-boost battery charger works over a wide 4.5V to 55V input range, and produces output voltages up to 55V. It includes a buck-boost DC/DC controller and a PowerPath™ battery charger, optimized for a variety of battery chemistries. The LTC4020 has many features, including PowerPath instant-on, timer-based charging, battery temperature monitoring, input voltage regulation, charging status and fault reporting.
How to build a Capacitive Battery Charger. For parts, or to purchase complete units, please call 414-852-7526
See our other videos for Part 2 of 2.
Build it Yourself Recommended Parts List!
12 Hr Timer: http://amzn.to/2qNgpNe
Multimeter/Volt Meter: http://amzn.to/2qNbsEo
Extension Cord: http://amzn.to/2r9A4Ii
With the rising market prices of oil getting higher and higher it really is a good idea to start cutting the costs you spend for gas. There are a number of ways to do this but what will be discussed here is your car's aerodynamics. Aerodynamic cars achieve better mileage and efficiency, so optimizing your car to be aerodynamic means saving gas money in the long run.
It is said that for highway driving conditions about 15% -20% of the total energy required to push you car along the highway is used up by the driveline. If you do not know what a driveline is then it's time you know that it is the drive shaft; it transmits rotational power from the transmission to the differential. Moving on, it is said that about 25% -30% of the same energy used to move your car down a highway is wasted by tire rolling resistance. It's also said that 60% of that same energy is wasted by air drag. This means that the friction produced by your car as it hits air slows it down, causing your car to use up more fuel in order to maintain your speed. However, aerodynamic cars do not have a problem with air drag along its hull; this means that these cars can save more fuel.
Optimizing the aerodynamic of your car is not rocket science. However, there are some aspects of this science that are applied to the way rockets are designed. Even the US military, air force, and navy are inventing ways and designing tanks, planes, and ships to become more aerodynamic, because they too recognize the potential efficiency that aerodynamics can achieve. It is only natural that the automobile industry will also soon catch up with its own aerodynamic cars. Even today, cars are getting smaller and sleeker. It is part of their design to reduce the air drag. Almost every part of the car is designed to be as efficient as possible.
To those of you who feel that it is not yet time to trade up your old car for one of those new aerodynamic cars, here are some ways to optimize you car for better efficiency and mileage. One good way to reduce air drag is by lowering the car. Lowering your car reduces the effective frontal area. This means that as your car passes through air it will be like a warm knife cutting through butter instead of a chopstick cutting through butter. However, caution has to be kept in mind as this can work only to a certain point and it is not safe to have a very low car. Another way to improve efficiency is by cleaning up the front of the car. This means that to have a smoother front can greatly improve your car aerodynamics and grant better efficiency. There are a lot of other ways to improve your cars aerodynamics but these two are the easiest and cheapest to do.
http://www.EnergyBrainiac.com – How To DIY Solar Battery Charger
The DIY Solar Charger | Popular Science
Jul 6, 2007 … The DIY Solar Charger. Keep your gadgets powered even when the grid … and build frames to hold the DC charger controller and the battery. …DIY: Solar Powered Battery Rechargers
In their latest catalog, several solar battery chargers are offered but one is particularly useful. The small Multi-volt Output Solar Panel (Cat. …Get Prepared Stuff – DIY Solar AA Battery Charger”
Most of the AA solar battery chargers available wouldn’t charge two AA 2000 mAh batteries in 4 days let alone 1 day of 4-5 hours of sun.Solar Battery Charging – Solar
Jul 30, 2007 … One of the simplest DIY solar projects is to make your own solar battery charger using a small Photovoltaic (PV) solar panel. …DIY Solar Battery Charger – Solar Energy How-to-Guide Directoy
DIY Solar Battery charger. Build your own solar battery charger for all of your electronic gadgets.Design Solar-Powered Computing Device – Hacked Gadgets – DIY Tech Blog
DIY projects describing how to build electronic projects. … Solar Battery Chargers – Cheap Solar Battery Chargers and Battery Charger ..
How To DIY Solar Battery Charger
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