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ECE 442 Power Electronics1 Class E Resonant Inverter

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ECE 442 Power Electronics2 Mode 1 Operation – Turn Q1 ON at t = 0 Turn Q1 OFF when v o = 0 volts

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ECE 442 Power Electronics3 The current through the transistor (switch) For sinusoidal current, The switch is turned OFF when the output voltage becomes = 0, and the current is “transferred” to the branch containing the capacitor.

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ECE 442 Power Electronics4 Mode 1

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ECE 442 Power Electronics5

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6 Mode 2 Operation Q 1 is turned OFF Diode D limits negative switch voltage

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ECE 442 Power Electronics7 Capacitor current becomes When the switch current falls to zero,

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ECE 442 Power Electronics8 Mode 2

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ECE 442 Power Electronics9 Waveform Summary

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ECE 442 Power Electronics10 Example 8.9 A class E inverter operates at resonance and has V S = 12 Volts and R = 10 Ω. The switching frequency is 25 kHz. –Determine the optimum values of L, C, C e, and L e Use MultiSim to plot the output voltage v 0 and the switch voltage v T for k = 0.304. Assume that Q = 7.

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ECE 442 Power Electronics11 Optimum Parameters

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ECE 442 Power Electronics12 Example 8.9 (continued)

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ECE 442 Power Electronics13

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ECE 442 Power Electronics14 Check the damping factor and resonant frequency

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ECE 442 Power Electronics15 Example 8.9

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ECE 442 Power Electronics16 Load Voltage Switch Voltage

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ECE 442 Power Electronics17 Class E Resonant Rectifier for power factor correction very large

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ECE 442 Power Electronics18 Mode 1 Operation -- D1 OFF

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ECE 442 Power Electronics19 Mode 2 Operation -- D1 ON

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ECE 442 Power Electronics20 D1 switches OFF at 0 volts (0 voltage switching) When the current i L falls to 0, the diode turns OFF. –When i L falls below I o, C discharges via D 1 –At turn-off, i D =i L =0 and v D =v C =0. –The capacitor current, i C =C(dv C /dt)=0, or (dv C /dt) = 0.

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ECE 442 Power Electronics21 Waveform Summary i L = i C + i D

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ECE 442 Power Electronics22 Example 8.10 A Class E rectifier supplies a load power of P L =400mW at V o =4V. The peak supply voltage is V m =10V. The supply frequency is f=250kHz. The peak-to-peak ripple on the dc output voltage is ΔV o =40mV. Determine the values of L, C, and C f. Determine the rms and dc currents of L and C.

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ECE 442 Power Electronics23 Example 8.10 (continued) Choose C=10nF. The resonant frequency will be 250kHz. Details on the following slide

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ECE 442 Power Electronics24

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ECE 442 Power Electronics25

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ECE 442 Power Electronics26 Example 8.10 (MultiSim)

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ECE 442 Power Electronics27

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ECE 442 Power Electronics28 Load Current 500 mA p-p Load Voltage 50 mV p-p

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