인버터의원리

( INVERTER ) ? 1. (1)

, . , 1957 Thyristor (SCR) , 1960 . Solid State Devices , 1 . , . , , , COMPUTER , . .

(2)

( PROCESS CONTROL ), . , ( BLOWER ) BLOWER , 3 .

(3) 1) DC MOTOR MOTOR AC MOTOR . . , , , . .

2) FAN, BLOWER DAMPER V.S MOTOR , SHORT .

TRIP . . , . . , . ( 67 ) . PLC . FAN, PUMP, BLOWER . CRANE, HOIST CONVEYER SOFT-START / SOFT-STOP . .

(4)

f P S N .

120f N = ------ * ( 1 - S )

P

1) ( P )

2) ( S ) .

3) ( f )

, ( P ) rpm (S) .

, . . , .

, . , VVVF( Variable Voltage Variable Frequency ) .

2. (1)

1) DC LINK L , . - .

2) SYSTEM

CONTROLLED RECTIFIER , . DC-LINK

DC-LINK .

CONTROLLED RECTIFIER . -

3)

- -

4)

(REGENERATION) . TURN-OFF PHASE CONTROL SCR . - . ( 6 66Hz ). : : ( COMMUTATION FAILURE ) .

5) .

4 . , THYRISTOR . PULL-OUT . . . . . .

FEEDBACK( CLOSED ) . . ( LOAD COMMUTATED INVERTER ) SPIKE , . SKIN EFFECT

(2) 1)

. LC . PAM , , PWM DC .

2) SYSTEM

SCR 3 DIODE MODULE . DC-LINK

DC-LINK CB( ) .

PWM .

3)

- ( ) - PWM

4)

1, 2 , 4 DUAL CONVERTER . PEAK .

PWM . TURN-OFF IGBT, FET TRANSISTOR . .

5) .

( COMMUTATION ) . 1 : 10 . . . , .

. REGENERATION DUAL CONVERTER . . . dv/dt PROTECTION .

3.

(1)

3 Diode Module( DM ) EMI Surge Absorber( ZNR ) .

(2) DC LINK

DC Filtering() ( CB ), OFF ( RB ) VDC Film ( C ), ON PM( IPM, TR. ) ( RS ) RLY( 84a ) . , SHORT POWER DC REACTOR .

(3)

TRANSISTOR, IGBT PWM DC , TURN-ON OFF 2 SNUBBER .

4. (1) PAM(Pulse Amplitude Modulation)

1)

2) PAM AC DC DIODE MODULE SCR MODULE , . , .

PAM

(2) PWM(Pulse Width Modulation) 1)

2)

PWM DIODE MODULE AC DC , CHOPPING , . , , 1/2 .

< PULSE >

< PULSE >

3) PWM

fR : ( ) fc : ( )

fC fR , .

(3) PWM & PAM PWM

(PM) (DM)

PAM

1 PWM PWM 2 3 4 5 6 95% 90% 7 80 94% 90% 8 9

10

11 NOISE .

.

. .

. NOISE . .

5.

(1) (2) Thermal (3) (4) TORQUE BOOST (5) JUMP (6) . LIMIT (7) (8) 2 (9) 2 (10) FREE-RUN-STOP (11) (12) (13) (14) DATA (15) (16) (17) : ( UP ), ( DOWN ) (18) GAIN. BIAS (19) (20) (21) (22) AUTO-TUNING (23) .

6.

(1) (2)

(3) (4) (5) (6) (7) (8) (9) (10) (11) EEPRON, CPU & CT ERROR (12) (13) (14) (15)