CA3059 Intersil, CA3059 Datasheet - Page 12

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CA3059

Manufacturer Part Number
CA3059
Description
ZERO VOLTAGE CROSSING SWITCH
Manufacturer
Intersil
Datasheet

Specifications of CA3059

Rohs Status
RoHS non-compliant

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for the load are controlled.
When electrical isolation between the logic circuit and the load
is necessary, the isolated-input technique shown in Figure
25B. is used. In the technique shown, optical coupling is used
to achieve the necessary isolation. The logic output transistor
switches the light source portion of the isolator. The light sensor
portion changes from a high impedance to a low impedance
when the logic output transistor is switched from off to on. The
light sensor is connected to the differential amplifier input of the
zero-voltage switch, which senses the change of impedance at
FIGURE 24. THE ZERO-VOLTAGE SWITCH AND THYRISTOR
COMPUTER OR
LOGIC OUTPUT
120 VAC
AS AN INTERFACE
60Hz
3
2
1
FIGURE 26. ZERO-VOLTAGE SWITCH, ON/OFF CONTROLLER WITH AN ISOLATED SENSOR
VAC
120
ZERO
VOLTAGE SWITCH
INTERFACING IC
ZVS
KNIGHT
54E-1421
(OR EQUIV.)
T
2
INTERFACE
POWER THYRISTORS
25.2
VAC
1.8K
SOLID STATE
0.47 F
1W
SCR
TRIAC
100 F
15VDC
+
-
MECHANISMS
Application Note 6182
LIMIT SWITCHES
CW
LOADS AND
THERMISTORS
PHOTOCELLS
SOLENOIDS
SENSORS
HEATERS
MOTORS
PTC/NTC
LAMPS
NTC
THERM-
ISTOR
M
R
P
12
14
13
8
2
7
a threshold level and switches the load on as in Figure 25A.
Sensor Isolation
In many applications, electrical isolation of the sensor from
the AC input line is desirable. Several isolation techniques
are shown in Figures 26, 27, and 28.
FIGURE 25. BASIC INTERFACING TECHNIQUES: A. DIRECT IN-
+V
5
9
CA3059
LOGIC OUTPUT
ISOLATED INPUT
10 11
DIRECT INPUT
6
1
LIGHT SOURCE
PUT; B. ISOLATED INPUT
PHOTOCELL
12
MODULE
3
DC RESISTANCE
100 F
4
FIGURE 25A.
100
FIGURE 25B.
F
(OR EQUIV.)
SPRAGUE
TRANSFORMER
11Z12
PULSE
3K
10K
1:1
T
1
I
13
13
8
8
7
7
R
LOAD
9
9
ZVS
ZVS
2
2
10
10
G
5
5
11
11
MT
MT
5K
5K
2
1
4
120V
4
120V
Y
1
AC
AC
LOAD
LOAD

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