Vivanco UNIVERSAL SWITCHMODE AC TO DC MAINS ADAPTERS WITH USB CHARGING FUNCTION Guia do Utilizador descarregar pdf (Página 62)

SMPS AC/DC Reference Design User’s Guide

FIGURE 3-7: ZVT CURRENT SAMPLING INSTANTS

The voltage compensator is implemented as a Proportional-Integral-Derivative

(PID) function. The voltage compensator is executed in the ADC ISR.

1PWM

2PWM

3PWM

4PWM

ADC Trigger generated

by PWM2 at beginning

of PWM cycle

ADC Trigger generated

by PWM1 at duty cycle

(1)

Note 1: The shaded regions represent the times when power is transferred from the primary side to the

secondary side. This region is sometimes referred to as the “effective” ZVT duty cycle.

minus phase shift

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 117 118

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Vivanco UNIVERSAL SWITCHMODE AC TO DC MAINS ADAPTERS WITH USB CHARGING FUNCTION Guia do Utilizador Página 62