High power and high frequency class-DE inverters by de Vries I.D.

By de Vries I.D.

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Chapter4. 1 Requirements of the Drive-Signal-Generator The first requirement of the drive-signal-generator is the ability two generate two drive signals of exactly the same frequency and duty cycle but are always phase shifted exactly 180º degrees relative to each other. The second requirement of the drive-signal-generator is the ability to vary the frequency and duty cycle of the drive signals. The duty cycle (or dead-time) of both the high and low drive signals should be adjusted simultaneously by a single adjustment method.

2 to be comprised of the gate-source capacitance and the gate-drain capacitance (or Miller capacitance) [31]. The total gate charge, Qg, required to charge the gate of an IRFP450 MOSFET from 0 V to 12 V is 120 nC. This total charge includes the (Miller) charge required to discharge the gate-drain capacitance when the MOSFET switches from the off-state, with a VDS of 300 V, to the on state. If this entire charge is to be delivered in 10ns then the gate-driver must supply an average current of Ig = 120nC/10ns = 12 A.

The off-state dv/dt rating will be increased with smaller values of RB and thus a low value of RB is desirable. Any stray impedances that are added externally to the MOSFET due to packaging and layout will also greatly affect the switching performance. The gate, drain and source lead inductance due to packaging should be as small as possible. Layout and packaging requirements are discussed further in chapter 6. Chapter 3. Topology, Switching Devices and Simulation 28 An optimum ratio of the above requirements must be selected.

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