3 Me Did As

  • April 2020
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Valor ac Sinal periódico qualquer

Valor médio zero

v(t) = VDC + vac (t) 2 Vac = Vef2 − VDC

Num período: (Vef )2 / R = (VDC )2 / R + Pac Valor eficaz de vac(t)

2 + Vac2 (Vef )2 / R =(VDC )2 / R+(Vac )2 / R ⇒ Vef = VDC

Exemplo: vac(t) V/2 v(t)

-V/2

V VDC

Vef =

+ V/2

V2 V Vef = = 2 2

Vac =

V2 V = 4 2

VDC

V = 2

V2 V2 + 4 4

V V2 = 2 = 4 2

Valor ac Exemplo: Calcule o valor AC do seguinte sinal:

100V Vef = Vmax / 2

Vac = V − V 2 ef

2 DC

2 2 Vmax Vmax = − 2 4 π

= Vmax

1 1 − 4 π2

= 100 × 0,3856 = 38,56V

Exercício: idem ao Exemplo para onda completa

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