Moteur de recherche de fiches techniques de composants électroniques |
|
MLX90804 Fiches technique(PDF) 8 Page - List of Unclassifed Manufacturers |
|
MLX90804 Fiches technique(HTML) 8 Page - List of Unclassifed Manufacturers |
8 / 12 page MLX90804 Speed regulator for universal motors MLX90804 Speed regulator for universal motors Page 8 Rev 1.0 30/Jun/00 Speed Set Ramping The SETP integrator is built around a 8 bit counter and guarantees a smooth transition when changing the speed setting. There is a comparator between SETP and IP. If SETP changes then the comparator enables the IP-counter until IP gets equal to SETP. The clock, which defines the rate of change, can be defined for up and down counting independently, and equals Fclkip= 102.3KHz/(128*(UPR[4:0]+1)) in case of counting up. Since the value for the desired speed is 10 bit wide, and the counter only 8, the setpoint ramp speed from the table is effectively multiplied by 4. FLL A frequency locked loop circuit is implemented to obtain a master frequency (approximately 100KHz ) from a free running on-chip oscillator. Both FLL and frequency multiplier have the same functional blocks, but the FLL uses the AC line frequency as his reference. Overload shutoff feature 625 ms after starting the motor (i.e. selecting a speed setting different from 0 rpm) the following function will be enabled: if the speed of the motor gets lower then a programmable value SLIM for longer then 320 ms, the motor speed is permanently set to 0 rpm. As a consequence the first possible timeout to recognize a blocked motor after start will be approximately 1 sec. This state can only be left by disconnecting the power from the electronic circuit. Overspeed shutoff feature If the speed of the motor gets higher then a programmable value SLIMA for longer than 320ms, the selected speed is permanently set to 0 rpm. This state can only be left by disconnecting the power from the electronics. Firing The PI regulator gives an ignition angle IGN. The resolution is 10 us. The firing circuit compares the ignition point with a maximum and minimum allowed angle MIN and MAX. MAX corresponds to Kp u 1 x n x 1 SUB A D U/D Reset Q 1 Q 4 Load Carry out ENB Preload Counter P=Q P>Q Q P COMP EQU REAL IP ERR Ki u 1 x n x 1 SUM DELAY ERRP u 1 x n x 1 SUM ERRI u 1 x n x 1 SUB ERRPI MIN_ANGLE IGN SETP START VZC SSE1 SSE2 Ki 0 0 1/ 8 0 1 1/ 16 1 0 1/ 32 1 1 1/ 64 |
Numéro de pièce similaire - MLX90804 |
|
Description similaire - MLX90804 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |