P3TP convertor is a source of electrical energy intended for a 28 VDC electrical power system of small aircrafts. The whole system consists of turboprop (TP100) or turboshaft (TS100) engine, which drives the three-phase highspeed generator its output is converted by the P3TP convertor to 28 VDC with the power of up to 3 kW. P3TP is designed to be used with generator and engine (TP100 / TS100) produced by the company PBS Velká Bíteš, a.s., Czech Republic.


Basic features:

• SMPS control based on analog circuit design (no SW involved in power generation functionality; SW partly involved in monitoring and CAN communication),
• output power limitation according to engine’s speed,
• cooled by the airflow of the suck air of the engine,
• constant current at overload (current limitation),
• controls the external contactor (disconnects the convertor from DC BUS in case of failure),
• monitoring – light indicators plus CAN communication,
• output voltage complies with MIL-STD-704F standard,
• environmental resistance compliant with RTCA DO-160G standard.

Technical parameters:

Input 3 ph. voltage (from generator):	3x (30 ÷ 80) VAC,SD
Frequency of input voltage:	up to 3 500 Hz
Output voltage:	28.5 V DC
Output power:	3 000 W (~105 A DC)
Ambient temperature:	-45°C ÷ 70°C
Dimension (including heatsink) (L x W x H):	250 x 190 x 100 mm
Weight:	3,5 kg

Protections:

• Over-current protection (short-circuit protected),
• over-temperature protection (adjustable threshold for warning),
• protected against DC bus failure (automatically disconnected by a contactor),
• under- and over-speed of engine,
• build-in tests and monitoring.

Monitoring:

• Actual output voltage and output current and actual engine speed rpm,
• actual convertor’s temperature (light indication if over-temperature),
• all important data are transmitted to CAN,
• light indication if voltage not sufficient for battery charging,
• light indication if over-loaded,
• light indication if convertor off or disconnected.