CA3059

Manufacturer Part NumberCA3059
DescriptionZERO VOLTAGE CROSSING SWITCH
ManufacturerIntersil
CA3059 datasheet
 


Specifications of CA3059

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and the breakover voltage of the Teccor HT-32 diac.
TYPE
IN3193 R
150K
AC
3
IN
R
CW
2
1.0MEG
2W
180
120 VAC
60Hz
HT-32
10 F
+
TYPE
50VDC
1.8K
-
IN914
C
2
COMMON
All Resistors 1/2 Watt
Pin Connections Refer to
Unless Otherwise Specified
the CA3059
FIGURE 32. RAMP GENERATOR
When the voltage across C
reaches approximately 32V, the diac
2
switches and turns on the 2N3904 transistor and 1N914 diodes.
F
1
R
L1
MT
MT
2
120VAC
60Hz
MT
MT
1
G
1/16A
10K
F
2
2W
+
1000 F
5
10VDC
-
2
2
13
13
4
ZVS
8
8
9
220
220
CW
K
K
7
50K
1/2W
18K
18K
THERMOSTAT OR
MANUAL SWITCH
All Resistors 1/2W, Unless Otherwise Specified.
Transistors Q
, Q
and Q
are Part of CA3096E
1
2
4
Integrated Circuit N-P-N/P-N-P Transistor Array.
FIGURE 35. SYNCHRONOUS SWITCHING HEAT STAGING CONTROLLER USING A SERIES OF ZERO-VOLTAGE SWITCHES
Application Note 6182
The capacitor C
junction of the transistor. This discharge time is the retrace or fly-
back time of the ramp. The circuit shown can generate ramp
1 MEG
R
TO PIN 2
times ranging from 0.3 to 2.0 seconds through adjustment of R
0
For precise temperature regulation, the time base of the ramp
VCC +6V
IN
should be shorter than the thermal time constant of the system,
but long with respect to the period of the 60Hz line voltage. Fig-
Q
R
10
TO PIN 9
2
ure 33 shows a triac connected for the proportional mode.
1
OUTPUT
Figure 34(a) shows a dual output temperature controller that
TYPE
2N3904
drives two triacs. When the voltage V
temperature sensing network exceeds the reference voltage
0.47 F
C
1
V
, motor No. 1 turns on. When the voltage across the net-
15VDC
R1
work drops below the reference voltage V
TO PIN 7
on. Because the motors are inductive, the currents I
incoming line voltage. The motors, however, are switched by
COMMON
the triacs at zero current, as shown in Figure 34(b).
The problem of driving inductive loads such as these motors
by the narrow pulses generated by the zero-voltage switch is
solved by use of the sensitive gate triac. The high sensitivity
of this device (3mA maximum) and low latching current
(approximately 9mA) permit synchronous operation of the
temperature controller circuit. In Figure 34(a), it is apparent
R
R
L2
L3
MT
2
2
MT
1
1
G
G
10K
10K
2W
2W
5
5
2
13
4
4
ZVS
ZVS
8
9
9
220
CW
CW
K
7
7
50K
50K
1/2W
1/2W
18K
470
10
5K
11
Q
4
12
R
3
5K
1
22K
1
Q
+
1
1000 F
6VDC
-
2
16
then discharges through the collector-to-emitter
1
developed across the
S
, motor No. 2 turns
R2
M1
R
RL5
L4
MT
MT
2
2
MT
MT
1
1
G
G
10K
10K
2W
2W
5
5
2
2
13
13
4
ZVS
ZVS
8
8
9
220
220
CW
K
K
7
7
50K
1/2W
18K
18K
6
Q
5
2.7K
2
4
E
O
R
2
100K
1K
.
2
lag the
4
9
CW
50K
1/2W