Samsung ML-2015/XEV manual Engine Controller, Heater Control

12
		Circuit Description
12.	Circuit Description
12.1	Engine Controller

The engine controller module consists of a motor controller, a PWM controller, a LSU I/F controller, and an ADC I/F controller.

12.1.1 Heater Control

ENGINE CONTROL PART AC CONTROL PART

		Vcc
FUSER
		R3
			IC1
			LM393D
Vcc Vcc			3
D1			1
			2
914T1
R1	R5		R4
	5.6K

R6

5.6K TR2 KSC

1008-Y C

		B
D3	R7	E
914T1	1K

PC1

4

2

1

6

R21

1.5K

R22 180 FUSIBLE

TRIAC

C21

104

CHOKE

H

N

R24

120

C22

103

1

AC VOLTAGE

2

HEAT

LAMP

THERM Rs

C

BD2

CN1

1

D2	R2	C1	TR1		B
914T1		10nF	KSC		C2
			1008-Y	E
					1nF

BD1

2

THERMISTOR

+24Vs

R23

100

The heat lamp radiates heat by using AC power. The AC power is a TRIAC (a semiconductor switch device) which controls a switch. The ‘ON/OFF’ control is completed by turning on/off a gate of the TRIAC through a photo TRIAC which is insulation part.

If explaining more detail about the AC control part, it consists of passive circuit ; therefore, it turns on/off the heater by receiving the signal from the engine control part. If the heater on signal is turned on at the engine, electricity flows in as the LED of the PC1 (Photo TRIAC) is connected. Then, it emits light.

By this light, the TRIAC unit, a light receiving unit, becomes on, and electricity is supplied to the gate of the TRIAC. Then, the TRIAC is turned on. As a result, AC current flows in a heat lamp, and the heat lamp radiates heat.

On the other contrary, if the signal is turned off, the PC1 becomes off, and the TRIAC is turned off due to no elec- tricity at the gate of the TRIAC. Consequently, the heat lamp is turned off.

Special Feature of TRIAC (THY 1): 16A, 600V SWITCHING

Phototriac Coupler (PC3)

Turn On If Current: 15mA~50mA (Design: 16mA)

High Repeive Peak Off State Voltage: Min 600V

Samsung Electronics

Service Manual 12-1