AC08FSM datasheet(137/223 Pages) TECCOR

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Application Notes

AN1003

AN1003 - 5

http://www.teccor.com

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+1 972-580-7777

Figure AN1003.13

Precision Proportional Temperature Control

Several speed control and light dimming (phase) control circuits

have been presented that give details for a complete 120 V appli-

cation circuit but none for 240 V. Figure AN1003.14 and Figure

AN1003.15 show some standard phase control circuits for 240 V,

60 Hz/50 Hz operation along with 120 V values for comparison.

Even though there is very little difference, there are a few key

things that must be remembered. First, capacitors and triacs con-

nected across the 240 V line must be rated at 400 V. Secondly,

the potentiometer (variable resistor) value must change consider-

ably to obtain the proper timing or triggering for 180° in each half-

cycle.

Figure AN1003.14 shows a simple single-time-constant light dim-

mer (phase control) circuit, giving values for both 120 V and

240 V operation.

Figure AN1003.14

Single-time-constant Circuit for Incandescent Light

Dimming, Heat Control, and Motor Speed Control

The circuit shown in Figure AN1003.15 is a double-time-constant

circuit which has improved performance compared to the circuit

shown in Figure AN1003.14. This circuit uses an additional RC

network to extend the phase angle so that the triac can be trig-

gered at small conduction angles. The additional RC network

also minimizes any hysteresis effect explained and illustrated in

Figure AN1003.10 and Figure AN1003.11.

Figure AN1003.15

Double-time-constant Circuit for Incandescent Light

Dimming, Heat Control, and Motor Speed Control

Load

120 V

(60 Hz)

Temp

Triac

"Gain"

Ramp

Time

Cool

Hot

UJT Triggering Level

Pedestal

UJT Emitter Voltage

R1, R2 = 2.2 k, 2 W

R3 = 2.2 k, 1/2 W

R4 = Thermistor, approx. 5 k

at operating temperature

R5 = 10 k Potentiometer

R6 = 5 M Potentiometer

R7 = 100 k, 1/2 W

R8 = 1 k, 1/2 W

Q1 = 2N2646

Q2 = Q2010L5

T1 = Dale PT 10-101

or equivalent

D1-4 = 200 V Diode

D5 = 20 V Zener

D6 = 100 V Diode

C1 = 0.1 µF, 30 V

0.1 µF 200 V

0.1 µF 400 V

Input

Voltage

120 V ac

60 Hz

240 V ac

50/60 Hz

12 A

3 A

250 k

500 k

Q2015L9

Q4004L4

100 µH

200 µH

C1, C3

HT-32

3.3 k

Input

R3 *

100

C3 *

Load

Note: L1 and C1 form an

RFI filter that may be eliminated

* dv/dt snubber network

when required

0.1 µF

100 V

Load

Current

0.1 µF 200 V

0.1 µF 400 V

Input

Voltage

120 V ac

60 Hz

240 V ac

50 Hz

240 V ac

60 Hz

8 A

6 A

250 k

500 k

Q2010L5

Q4008L4

100 µH

200 µH

C1, C2, C4

HT-32

3.3 k

Input

R4 *

100

C4 *

Note: L1 and C1 form an

RFI filter that may be eliminated

* dv/dt snubber network

when required

0.1 µF

100 V

15 k

1/2 W

Load

Current

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