CA3059

Manufacturer Part NumberCA3059
DescriptionZERO VOLTAGE CROSSING SWITCH
ManufacturerIntersil
CA3059 datasheet
 


Specifications of CA3059

Rohs StatusRoHS non-compliant  
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Page 21
22
Page 22
23
Page 23
24
Page 24
25
Page 25
26
Page 26
27
Page 27
28
Page 28
29
Page 29
30
Page 30
31
Page 21/31

Download datasheet (595Kb)Embed
PrevNext
output under DC operation should be limited to 20mA. The
motor triac is synchronized to zero crossing because it is a
high current inductive load and there is a change of generat-
ing RFI. The solenoid is a very low current inductive load, so
there would be little chance of generating RFI; therefore, the
initial triac turn-on can be random which simplifies the
circuitry.
ZERO
CROSSING
PULSE 60Hz
8.3ms
MACHINE
RATE
10ms
MACHINE
ONE
REP RATE
REVOLUTION
MOTOR
SOLENOID
OPERATION
FIGURE 44. TIMING DIAGRAM FOR SOLID-STATE MACHINE
CONTROL
MACHINE RATE
PULSE
10ms
ZERO-
+6V
SWITCHING
SYNC
5K
10K
2
5
13
ZVS
5K
8
11
7
10
9
500
+6 V
500
10K
10K
10K
4K
2
3K
13
9
ZVS
8
7
500
12
TIME DELAY
+6V
FUNCTION
OR ONE-
SHOT
2
10K
MULTI-
12
13
VIBRATOR
50K
ZVS
PULSE
8
LENGTH
1
7
ADJ.
9
500
10
1M
0.1
FIGURE 45. SCHEMATIC OF PROPOSED SOLID-STATE MA-
CHINE CONTROL
This example shows the versatility and advantages of the
Intersil zero-voltage switch used in conjunction with triacs as
interfacing and control elements for machine control.
Application Note 6182
400Hz Triac Applications
The increased complexity of aircraft control systems, and the
need for greater reliability than electromechanical switching
can offer, has led to the use of solid-state power switching in
aircraft. Because 400Hz power is used almost universally in
aircraft systems, Intersil offers a complete line of triacs rated
for 400Hz applications. Use of the Intersil zero-voltage
switch in conjunction with these 400Hz triacs results in a
minimum of RFI, which is especially important in aircraft.
Areas of application for 400Hz triacs in aircraft include:
1. Heater controls for food warming ovens and windshield
defrosters
2. Lighting controls for instrument panels and cabin illumination
3. Motor controls and solenoid controls
4. Power supply switches
Lamp dimming is a simple triac application that demonstrates
an advantage of 400Hz power over 60Hz power. Figure 46
shows the adjustment of lamp intensity by phase control of the
+V
60Hz line voltage. RFI is generated by the step functions of
power each half cycle, requiring extensive filtering. Figure 47
0
MACHINE
shows a means of controlling power to the lamp by the zero-
REP RATE
voltage switching technique. Use of 400Hz power makes possi-
ble the elimination of complete or half cycles within a period
(typically 17.5ms) without noticeable flicker. Fourteen different
+6V
levels of lamp intensity can be obtained in this manner. A line
120
500
VAC
synced ramp is set up with the desired period and applied to
terminal No. 9 of the differential amplifier within the zero-voltage
+V
4
switch, as shown in Figure 48. The other side of the differential
0
amplifier (terminal No. 13) uses a variable reference level, set
ZERO-
CROSSING
by the 50K potentiometer. A change of the potentiometer set-
INVERTED
ting changes the lamp intensity.
PULSE
MOTOR CONTROL
MOTOR
60Hz LINE
VOLTAGE
+6V
M
500
60
4
LAMP
OUTPUT
5K
FIGURE 46. WAVEFORMS FOR 60Hz PHASE CONTROLLED
SOLENOID
4
250
400Hz LINE
VOLTAGE
+6V
LINE
SYNCED
RAMP
LAMP
OUTPUT
FIGURE 47. WAVEFORMS FOR 400Hz ZERO-VOLTAGE
21
16.67ms
LAMP DIMMER
17.5ms
VARIABLE
REFERENCE
LEVELS
SWITCHED LAMP DIMMER