CA3059

Manufacturer Part NumberCA3059
DescriptionZERO VOLTAGE CROSSING SWITCH
ManufacturerIntersil
CA3059 datasheet
 


Specifications of CA3059

Rohs StatusRoHS non-compliant  
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for the load are controlled.
COMPUTER OR
INTERFACE
LOGIC OUTPUT
TRIAC
ZVS
ZERO
3
VOLTAGE SWITCH
INTERFACING IC
2
1
SCR
SOLID STATE
POWER THYRISTORS
FIGURE 24. THE ZERO-VOLTAGE SWITCH AND THYRISTOR
AS AN INTERFACE
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
1.8K
1W
120 VAC
0.47 F
60Hz
120
VAC
25.2
VAC
T
2
KNIGHT
54E-1421
(OR EQUIV.)
FIGURE 26. ZERO-VOLTAGE SWITCH, ON/OFF CONTROLLER WITH AN ISOLATED SENSOR
Application Note 6182
a threshold level and switches the load on as in Figure 25A.
LOADS AND
MECHANISMS
M
MOTORS
SOLENOIDS
LOGIC OUTPUT
HEATERS
DIRECT INPUT
LAMPS
SENSORS
PHOTOCELLS
+V
PTC/NTC
THERMISTORS
LIMIT SWITCHES
ISOLATED INPUT
FIGURE 25. BASIC INTERFACING TECHNIQUES: A. DIRECT IN-
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.
5
6
1
2
CW
R
14
P
+
13
CA3059
100 F
-
NTC
15VDC
8
THERM-
ISTOR
7
9
10 11
12
5K
10K
2
5
100 F
13
3K
4
ZVS
8
7
120V
11
9
10
FIGURE 25A.
5K
100
2
5
F
13
4
ZVS
8
7
120V
9
10
11
PHOTOCELL
LIGHT SOURCE
MODULE
FIGURE 25B.
PUT; B. ISOLATED INPUT
R
LOAD
3
MT
T
2
I
4
PULSE
Y
TRANSFORMER
1:1
MT
G
1
12
SPRAGUE
11Z12
(OR EQUIV.)
DC RESISTANCE
1
LOAD
AC
LOAD
AC
1