Disadvantages Of A Converter
Chapter-4 CONTROLLERS
4.1 INTRODUCTION
The topic discusses principles of converters used for multiple stage design of LED driver. This topic also presents the functions of each component in the design circuit and the operation of each one.
4.2 CONTROLLED CONVERTER
Switching regulators are preferable than linear regulators owing to the higher efficiency. The utmost interesting feature of switching regulator is the conversion of energy stored in the inductor .The energy stored may be utilized for increasing the output voltage(Boost), reducing the output voltage(Buck) or even it can used to provide isolation by connecting a transformer. Secondly, the losses due to transmission is less. The better thermal management and the compactness of the switching regulator drives equal importance along with other features.
4.3 CLASSIFICATION OF CONVERTERS
DC converter
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Due to minimum switching device it has a high efficiency. The limitations are the use of a larger filter capacitor and a large inductor than those of a buck regulator.
4.3.3 Buck- Boost Converter A buck boost converter provides an output voltage that may be less than the input voltage-hence the name “buck-boost” the output voltage polarity is opposite to that of the input voltage. This regulator is also known as an inverting regulator. The circuit arrangement of a buck-boost regulator is shown in fig4.4 Fig 4.4 Buck-Boost Converter (4.3) where LC is the critical value of the inductor.
If Vc is the average capacitor voltage, the capacitor ripple voltage ∆Vc=2Va.using the equation (4.4)
Which gives the critical value of the capacitor Cc as
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