List and Location of Components on the DriveLab Board
Each 3-phase inverter uses MOSFETs as switching devices. The 3-phase outputs for both inverters are identified as A1, B1 and C1 for Inverter 1 and A2, B2 and C2 for Inverter 2. The power supply for the 3-phase bridge drivers for the inverters is derived from the DC bus through a flyback converter (A-2). The inverters are driven by 3-phase bridge drivers (IR2133). The PWM inputs are isolated before being fed to the drivers. See the following figure.
+/-12V signal supply is required for the isolated analog signals (outputs of the DriveLab box). Switch S90 (C-2) controls the signal power to the board. The green LED D70 (C-2) indicates if the supply is available to the board or not. Fuses F90 (C-2) and F95 (B-2) provide protection for the +12V and -12V supplies respectively.
The board has over-current protection for each inverter. An over-current fault on inverter 1 is indicated by the red LED labeled MOTOR FAULT 1 and an over-current fault on inverter 2 is indicated by the red LED labeled MOTOR FAULT 2.
Probe points are provided to observe the inverter quantities. BNC connector VOLT DC (B-4) is provided to probe the DC bus voltage. Note that the scaling factor of the DC bus input voltage is 1/10. See the following figure.
LEM sensors are used to measure the output current of the inverters. Only phase A and phase B currents are available. The phase C current can then be calculated using the current relationship Ia+Ib+Ic = 0, assuming that there is no neutral connection for the motors. The calibration of the current sensor is such that for a 1A current flowing through the current sensor, the voltage output is 0.5V (scaling factor of ½). See the following figures.
See below for an exhaustive list of the DriveLab board components and their location.
DriveLab Board Chart
| Number | Component | PCB Reference | Chart Location |
|---|---|---|---|
| 1 | Terminal +36 | J1 | A-4 |
| 2 | Terminal GND | J2 | A-3 |
| 3 | Terminal PHASE A1 | J3 | D-6 |
| 4 | Terminal PHASE B1 | J4 | E-6 |
| 5 | Terminal PHASE C1 | J5 | G-6 |
| 6 | Terminal PHASE A2 | J6 | J-6 |
| 7 | Terminal PHASE B2 | J7 | K-6 |
| 8 | Terminal PHASE C2 | J8 | L-6 |
| 9 | DIN connector for ±12 V signal supply | J90 | B-2 |
| 10 | Signal supply switch | S90 | C-2 |
| 11 | Signal supply +12 V fuse | F90 | C-2 |
| 12 | Signal supply -12 V fuse | F95 | B-2 |
| 13 | Signal supply LED | D70 | C-2 |
| 14 | Motor – Fault LED | D66 | D-2 |
| 15 | Motor – Fault LED | D67 | L-2 |
| 16 | Digital power LED | D68 | I-2 |
| 17 | Main power LED | D69 | B-3 |
| 18 | Inverter 1 | D-3 to G-4 | |
| 19 | Inverter 1 | C1 | I-3 to L-4 |
| 20 | Inverter 1 DC link capacitor | C2 | B-5 |
| 21 | Inverter 2 DC link capacitor | U1 | G-5 |
| 22 | Inverter 1 Driver IC IR2133 | U3 | E-2 |
| 23 | Inverter 2 Driver IC IR2133 | F2 | J-2 |
| 24 | Digital supply fuse | G-1 | |
| 25 | |||
| 26 | Reset switch | S1 | L-1 |
| 27 | Phase A1 current sensor (LEM) | CS2 | C-5 |
| 28 | Phase B1 current sensor (LEM) | CS3 | D-5 |
| 29 | Phase A2 current sensor (LEM) | CS5 | H-5 |
| 30 | Phase B2 current sensor (LEM) | CS6 | J-5 |
| 31 | DC link current sensor (LEM) | CS1 | L-5 |
| 32 | Volt DC | BNC5 | B-4 |
| 33 | Curr A1 | BNC1 | B-3 |
| 34 | Curr B1 | BNC2 | C-3 |
| 35 | Curr A2 | BNC3 | H-3 |
| 36 | Curr B2 | BNC4 | I-3 |