This manual provides Hisense variable‑frequency air‑conditioner hardware circuit theory, classifications, and detailed circuit designs for technicians.
The manual introduces the principle of variable‑frequency air‑conditioners, outlines Hisense product series, and describes hardware circuits for both AC and DC variable‑frequency units. It also covers special circuits such as inductive key circuits, current‑detection circuits, PFC circuits, and IPM module basics.
Additional sections detail protection features, shunt‑resistance settings, mechanical installation guidelines, and safety precautions for maintenance and repair work. This manual is written in Chinese.
| IPM module composition | 6 IGBTs |
|---|---|
| Short‑circuit protection time | 1.5–2 µs |
| Output pulse time formula | Cfod = 18.3×10⁻⁶ × tfod |
The manual covers fixed‑capacity, variable‑capacity, variable‑speed, variable‑volume, multi‑compressor, and constant‑speed air‑conditioners.
It uses a variable‑frequency principle, converting power to AC via an inverter and changing the inverter output frequency to adjust compressor speed.
The circuit includes short‑circuit protection with a time constant set between 1.5 and 2 microseconds.