SPO-4
Static Single-Phase Converter
Description
SPO-4 static single-phase converter
SPO-4 is an aircraft static single-phase converter that transforms 27 V DC aircraft power into 36 V, 400 Hz single-phase AC of rectangular waveform. The conversion is performed by transistors operating in switching mode. This confirmed electrical purpose places SPO-4 in Power Transducers rather than among generic electronic control units.
Full descriptionCollapse description
Main and standby conversion channels
The published design uses two channels to improve reliability. The main channel includes an oscillator and power amplifier, while the standby channel has its own corresponding stages. An output transformer forms the required supply, a contactor transfers the output circuit to the standby channel, and a monitoring block supports serviceability control.
Output data and connected loads
The documented input is 27 V DC. The output is a rectangular-wave single-phase voltage of 36 ±5 V effective value at 400 Hz ±2%. Maximum output power under the specified active-reactive load is 35 VA. SPO-4 is used to supply individual aircraft instruments, including inductive pressure-gauge transmitters of the DIM family.
Aircraft electrical-system application
Manufacturer information states that SPO-4 is used on many civil aircraft and helicopters. The exact platform and wiring must be confirmed from the aircraft equipment list because the same aircraft electrical system may contain several converter types. Supply voltage, load, mounting and connector configuration must match the installed execution.
Identification, testing and ordering
Inspect the ventilation openings, cables, connectors, mounting feet, fasteners, seals and nameplate. Test both conversion channels, transfer logic, output voltage, frequency and load capability using approved equipment. An enquiry should state SPO-4, aircraft type, required completeness and documentation. Related converters are available under Power Transducers.
Technical details
- Product Name
- Static Single-Phase Converter
- Primary Designation
- SPO-4
- Original Cyrillic Designation
- СПО-4
- Product Type
- Aircraft static DC-to-AC converter
- Input
- 27 V DC
All specificationsCollapse specifications
- Output Voltage
- 36 ±5 V AC, effective value
- Output Waveform
- Rectangular
- Output Frequency
- 400 Hz ±2%
- Maximum Output Power
- 35 VA under the documented active-reactive load
- Conversion Method
- Transistor switching mode
- Reliability Architecture
- Main and standby conversion channels
- Typical Load
- Individual aircraft instruments, including DIM-type inductive pressure transmitters
- Aircraft Context
- Used on many civil aircraft and helicopters; exact effectivity must be checked
- Alternative Designations
- SPO-4; SPO4; SPO 4; СПО-4; СПО4
- Documentation
- Product passport and aircraft electrical-system documentation
Payment & delivery
Orders ship from our hub in Dubai. Partner stock is first transferred to Dubai, then shipped to you.
Dubai stock: 100% before dispatch. Partner stock (Remote stock) and Pre-order: 50% advance payment to start the order and 50% before shipment from Dubai to you.
Availability, lead time, delivery cost and payment terms are confirmed for your order before payment.
Payment & delivery terms