AVS description

AN390

10/17

DocID3572 Rev 4

The AC line voltage measurement is implemented through the detection of the AC line peak

Equation 11

.

Equation 9

improve the AC line voltage measurement.

Equation 9

Equation 10

defines R1 and R2 resistors to switch from doubler operation to bridge

operation (from range I to range II).

Equation 10

Where:

•

•

Equation 11

defines R1 and R2 resistors to switch from bridge operation to doubler

operation (from range II to range I).

Equation 11

Where:

•

•

•

18 kΩ and 1 MΩ at 1%.

Ω

<

+

<

Ω

M

R

R

k2

800

2

1

1

2

2

1

2

-

•

-

=

TH

REG

V

V

I

range

on

voltage

rms

Max

R

R

(

(

1

2

2

1

2

-

-

=

TH

REG

V

V

II

range

on

voltage

rms

Max

R

R

•

H

V

-

(

(