11-04-2012, 11:43 AM
PROTOTYPING AND DESIGN
INTRODGCTION
This chapter presents the design procedure to be followed when designhg the
proposed converter. The design procedure is followed by a design example to illustrate
the design process and help in the selection of proper converter components. The design
of the converter is based on the characteristic curves derived in Chapter 3 and other
considerations such as proper ZVS interval, proper tum-off, output voltage ripple, input
current ripple, duty cycle range arnong others.
DESIGNO F THE PROPOSED ZVT CONVERTER
The design specifications and design procedure of the proposed ZVT converter
are presented in this section.
DESIGNPR OCEDURE AND EXAMPLE
The design procedure is divided into two parts:
(i) Design of the Power Circuit.
(ii) Design of the Auxiliary resonant Circute
DESIGNO F THE POWER CIRCUIT
The guidelines for the design of the power circuit are presented in this section
except for the main boost switch as its peak current rating depends upon the operation of
the awciliary circuit-
Resonant hductor
The selection of the resonant inductor L, is made keeping in mind that the
reverse recovery current of the boost diode is to be made zero. Therefore the selection of
resonant inductor depends on the boost diode's tum-off di/dt and this can be controlled
by slowly diverting the current flowing through it to the resonant inductor.
conclution
In this chapter design guidelines were laid down and a design example was
presented for designhg the proposed converter. Use was made of the characteristic
curves presented in Section 2.5 and equations were developed in this chapter to assist in
the selection of the component values of the converter.