CA3059 Intersil, CA3059 Datasheet - Page 29

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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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1. The load should be connected in a three wire configuration
2. Only one logic command signal is available for the control
3. Three separate triac gating signals are required.
4. For operation with resistive loads, the zero-voltage switch-
Isolation of DC Logic Circuitry
As explained earlier under Special Application Consider-
ations, isolation of the DC logic circuitry* from the AC line,
the triac, and the load circuit is often desirable even in many
single phase power control applications. In control circuits for
polyphase power systems, however, this type of isolation is
essential, because the common point of the DC logic cir-
cuitry cannot be referenced to a common line in all phases.
* The DC logic circuitry provides the low level electrical signal that
FIGURE 60. SIMPLIFIED DIAGRAM OF A THREE PHASE HEATER CONTROL THAT EMPLOYS ZERO-VOLTAGE SYNCHRONOUS
COMMAND
dictates the state of the load. For temperature controls, the DC log-
ic circuitry includes a temperature sensor for feedback. The Intersil
integrated circuit zero-voltage switch, when operated in the DC
mode with some additional circuitry, can replace the DC logic cir-
cuitry for temperature controls.
with the triacs placed external to the load; either delta or
wye arrangements may be used. Four wire loads in wye
configurations can be handled as three independent sin-
gle phase systems. Delta configurations in which a triac is
connected within each phase rather than in the incoming
lines can also be handled as three independent single
phase systems.
circuits. This signal must be electrically isolated from the
three phase power system.
ing technique should be used to minimize any radio fre-
quency interference (RFI) that may be generated.
LOGIC
DC
SWITCHING IN THE STEADY STATE OPERATING CONDITIONS
PHOTO-COUPLED
ISOLATORS
100
100
100
+
+
+
10K
10K
10K
25K
25K
25K
Application Note 6182
13
13
13
7
8
2
7
8
2
7
8
2
9
9
9
ZVS
ZVS
ZVS
10
10
10
5
5
5
29
11
11
11
In the three phase circuits described in this section, photo optic
techniques (i.e., photo coupled isolators) are used to provide
the electrical isolation of the DC logic command signal from the
AC circuits and the load. The photo coupled isolators consist of
an infrared light emitting diode aimed at a silicon photo transis-
tor, coupled in a common package. The light emitting diode is
the input section, and the photo transistor is the output section.
The two components provide a voltage isolation typically of
1500V. Other isolation techniques, such as pulse transformers,
magnetoresistors, or reed relays, can also be used with some
circuit modifications.
Resistive Loads
Figure 59 illustrates the basic phase relationships of a bal-
anced three phase resistive load, such as may be used in
heater applications, in which the application of load power is
controlled by zero-voltage switching. The following condi-
tions are inherent in this type of application:
1. The phases are 120 degrees apart; consequently, all three
2. A single phase of a wye configuration type of three wire
3. Two phases must be turned on for initial starting of the
These conditions indicate that in order to maintain a system
in which no appreciable RFI is generated by the switching
phases cannot be switched on simultaneously at zero voltage.
system cannot be turned on.
system. These two phases form a single phase circuit
which is out of phase with both of its component phases.
The single phase circuit leads on phase by 30 degrees
and lags the other phase by 30 degrees.
4
4
4
3 (SEE FIGURE 62) INPUT
R
5
R
6
R
4
IN4003
IN4003
IN4003
D
D
D
1
2
3
100
100
100
R
R
R
1
2
3
RESISTIVE LOAD
(DELTA OR WYE)
3 PHASE

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