ENI-TL600/24AC-22 Converter
Description
APPLICATION
The ENI-TL 600/24AC-22 static converter is intended as a 24 V and 3 x 400 VAC power supply for trolleybus driver's cab and passenger cabin air conditioning lines.
SPECIFICATIONS
| Supply voltage | 600 VDC (-220 / +200) |
| 24 VDC output | |
| Rated output voltage | 27,6 V ± 0,5 V |
| Rated output current | 120 A |
| AC output | |
| Rated output voltage | 3 x 400 V ± 5%, 50 Hz |
| DC rated output line current | 23 A |
| Output overload capacity | 300 % in 1 s |
| Selected specific data | |
| Cooling | forced |
| Ambient operating temperature | -30 ºC ÷ +40 ºC |
| Converter installation | vehicle roof |
| Size [L x W x H] | 1238 x550 x 400 mm |
| Weight | ca. 180 kg |
DESIGN
The converter features a sealed enclosure of powder-coated aluminium sheet. The converter is designed for roof mounting. The unit comprised two boxes integrated with each other. The bottom box is the "dirty" compartment, which features heat sinks for semiconductors, the cooling fan and inductive components. The top box contains the remaining power components and the converter controller. The HV and LV terminals are located on the enclosure side wall, perpendicular to the driving direction. The enclosure top panel is an openable cover with four locks for easy service access. The cover features a sun shield. The enclosure houses the complete electrical system of the converter, comprising three lines:
- contact system to 600 VDC intermediate voltage line,
- intermediate voltage to 3 x 400 V, 50 Hz output voltage line,
- intermediate voltage to 24 VDC voltage output line.
OPERATION
The converter supply voltage passes an input filter to an inverter, which generates the 600 VDC intermediate voltage. The AC voltage output from IGBTs feeds a transformer which provides double galvanic separation between the supply mains and the converter output circuits. When filtered and rectified, the transformer output voltage is passed to an output inverter which generates the AC output and the DC line inverter. The AC output voltage is formed from the sine-wave voltage output of the IGBTs and smoothed with sine-wave filters. The DC output voltage is formed from the sine-wave voltage output of the IGBT that powers the transformer. The transformer provides galvanic separation of the output voltage from all other converter lines. The transformer output voltage is rectified, filtered and passed to the 24 VDC output. The converter controller limits the battery charging current and the 24 VDC current. The converter monitors the performance and operating parameters with a diagnostic software interfaced via the CAN bus network.
BLOCK DIAGRAM
Power kW
22
Input voltage
600 VDC
Output voltage
24 VDC , 3 x 400 VAC
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