CA3059

Manufacturer Part NumberCA3059
DescriptionZERO VOLTAGE CROSSING SWITCH
ManufacturerIntersil
CA3059 datasheet
 


Specifications of CA3059

Rohs StatusRoHS non-compliant  
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on by the logical “1” (V
high) state of the flip-flop.
CC
The arrangement describe can also be used for a synchro-
nous, sequential traffic controller system by addition of one
triac, one gating transistor, a “divide-by-three” logic circuit,
and modification in the design of the diac pulse generator.
Such a system can control the familiar red, amber, and
green traffic signals that are found at many intersections.
LAMP 1
5K
100
5W
120V
AC
F
60Hz
15
VDC
2
3
5
6
14
1
13
4
ZVS
1
Y
MT
1
2
8
12
11
10
1/2 W
9
MT
7
1
G
IC
1
FIGURE 50. SYNCHRONOUS LIGHT FLASHER
Synchronous Light Flasher
Figure 50 shows a simplified version of the synchronous
switching traffic light flasher shown in Figure 49. Flash rate is
set by use of the curve shown in Figure 16. If a more precise
flash rate is required, the ramp generator described
previously may be used. In this circuit, ZVS
control unit and ZVS
is slaved to the output of ZVS
2
its inhibit terminal (terminal 1). When power is applied to
lamp No. 1, the voltage of terminal 6 on ZVS
ZVS
is inhibited by the current in R
2
off, ZVS
is not inhibited, and triac Y
2
supplies operate in parallel. The on/off sensing amplifier in
ZVS
is not used.
2
Transient Free Switch Controllers
The zero-voltage switch can be used as a simple solid-state
switching device that permits AC currents to be turned on or
off with a minimum of electrical transients and circuit noise.
The circuit shown in Figure 51 is connected so that, after the
control terminal 14 is opened, the electronic logic waits until
the power line voltage reaches a zero crossing before power
is applied to the load Z
. Conversely, when the control termi-
L
nals are shorted, the load current continues until it reaches a
zero crossing. This circuit can switch a load at zero current
whether it is resistive or inductive.
The circuit shown in Figure 52 is connected to provide the
opposite control logic to that of the circuit shown in Figure
Application Note 6182
51. That is, when the switch is closed, power is supplied to
the load, and when the switch is opened, power is removed
from the load.
In both configurations, the maximum rms load current that
can be switched depends on the rating of triac Y
Differential Comparator for Industrial Use
Differential comparators have found widespread use as limit
detectors which compare two analog input signals and
LAMP 2
provide a go/no-go, logic “one” or logic “zero” output,
depending upon the relative magnitudes of these signals.
Because the signals are often at very low voltage levels and
R
2
X
very accurate discrimination is normally required between
20K
3
5
them, differential comparators in many cases employ
6
14
1
differential amplifiers as a basic building block. However, in
many industrial control applications, a high performance
13
4
ZVS
2
differential comparator is not required. That is, high
Y
MT
2
2
resolution, fast switching speed, and similar features are not
8
12
11
essential. The zero-voltage switch is ideally suited for use in
10
9
such applications. Connection of terminal 12 to terminal 7
MT
7
1
G
inhibits the zero-voltage threshold detector of the zero-
IC
2
voltage switch, and the circuit becomes a differential
comparator.
Figure 53 shows the circuit arrangement for use of the zero-
voltage switch as a differential comparator. In this
application, no external DC supply is required, as is the case
with
most
comparators; of course, the output current capability of the
zero-voltage switch is reduced because the circuit is
operating in the DC mode. The 1000
connected between terminal 4 and the gate of the triac,
is the master
1
through
1
is high and
1
. When lamp No. 1 is
X
can fire. The power
2
24
.
2
commercially
available
integrated
resistor R
circuit
,
G