Application cases of home appliances

     In the current era of global warming, air conditioners play an important role in white home appliances. A typical air conditioning system consists of an outdoor unit, an indoor unit, and a power supply unit. For the power supply unit, Jiejie Microelectronics has a high isolation voltage optocoupler for isolation of PWM and PFC. For the indoor unit, the MCU controls the fan module combined with the optocoupler, the heater switch combined with the phototriac and peripherals. Primary isolation of the MCU and associated peripherals ensures circuit reliability. For the outdoor unit, an MCU is used to control the motor system of the fan and compressor. Motor control systems are an integral part of various household appliances. Each individual module depends on safety and environmental protection requirements, performance requirements and, of course, manufacturing costs. Therefore, when designing household appliances, it is necessary to strengthen the isolation of the microcontroller and peripheral devices from the application circuit to ensure low noise of the circuit.

       The more common brushless DC fan is a DC motor without a mechanical commutator and brushes. It uses an electronic commutation device, thus overcoming the common DC motor's problems of commutation sparks, poor reliability, high noise, and radio interference. Interference and other weaknesses. It not only has the mechanical characteristics and adjustability of general DC motors, but also has the advantages of wide speed range, small size, quick start, reliable operation, high efficiency and long life. Currently widely used in the small household appliance fan industry, the general power is less than 100W. The topology structures include P+N, N+N, and 3 Phase.

Advantages of NCE:

       Smaller package size: dual-chip N+N or N+P dual-core package chip for brushless brushless DC motors.

   Greater current capability: The use of CLIP and SMD packaging makes the chip’s heat dissipation capability stronger.

  Better reliability: greater avalanche capability and impact resistance.