– Commercial –

This reference design offers a complete resolution for air conditioner designs, similar to window A/Cs and break up A/Cs’ outside unit, providing a path to environment friendly and cost-effective A/C techniques.

Trendy A/C designs utilise an inverter-based variable velocity drive for the brushless motor-based compressor and condenser followers to satisfy stringent power effectivity scores and energy issue specs. This strategy permits optimum energy settings, decreasing total energy consumption in comparison with conventional fixed-speed single-phase AC induction motor (ACIM) drives. Energy issue correction (PFC) can also be important for high-power home equipment to make sure grid compatibility.

Microchip’s reference design utilises the dual-core dsPIC33CH household of digital sign controllers (DSCs) to effectively management the condenser fan, compressor, PFC, and total utility logic. The high-performance dsPIC33C DSCs, together with each Twin-core dsPIC33CH and Single-core dsPIC33CK fashions, present excellent peripherals for twin motor management, permitting the substitute of three controllers with one for price benefits. The design includes a 220V, 1.8 KW energy issue correction (PFC) stage with Digital Interleaved Increase expertise, reaching an effectivity larger than 90%, an influence issue of 0.991, and a complete harmonic distortion (THD) of lower than 5%. 

– Commercial –

The condenser fan and compressor are powered by 120 W and 1.34 KW phases, respectively. The motor management side of the design helps each everlasting magnet synchronous motors (PMSM) and inside everlasting magnet synchronous motors (IPMSM). It contains an inverter stage able to dealing with as much as 1.4 KW and operates at a switching frequency vary of 4 to twenty kHz. Variable velocity management is achieved via sensorless field-oriented management (FOC), complemented by options similar to torque compensation, area weakening, a PLL estimator, most torque per ampere (MTPA) for IPMSM, and stall detection.

To additional improve the performance of the air con system, the design contains temperature sensor interfaces for monitoring ambient air, inlet air, outlet air, and condenser temperature. It additionally offers management interfaces for solenoid valves and digital growth valves (stepper motor). A fly-back DC-DC converter generates the required 15-V, 12-V, and three.3-V energy rails. Optionally available help is accessible for utilizing an AC induction motor (ACIM) or a built-in drive brushless DC motor (BLDC) for the condenser fan. Subject communication help with the indoor unit can also be included. The design addresses a number of design challenges, together with decreasing improvement time via a whole manufacturable resolution, reducing the invoice of supplies (BOM) price via a extremely built-in design, and guaranteeing optimum efficiency with a high-efficiency FOC algorithm and dependable compressor start-up software program. 

Microchip has examined this reference design. It comes with a Invoice of Materials (BOM), schematics, and so forth. You will discover extra knowledge in regards to the reference design on the corporate’s web site. To learn extra about this reference design, click on right here.