According to statistics, the number of motors used in refrigerators is the highest, reaching about 5; two motors are also used in air conditioning and drying and washing machines. DC fan motors, automatic ice machines and dampers for refrigerators, throttle valves and drain/water supply pumps for drying and washing machines, etc. usually use single-chip integrated motor drives, while air-conditioning DC fans for outdoor units/indoor units The DC fan motor of the drying and washing machine will use the motor controller. These motor drivers/controllers also have different voltage and current ranges, as shown in Figure 1.
Figure 1: Application of motor driver/controller in white goods
BLDC motor driver for refrigerator
1, DC fan motor
For refrigerators, heat removal by fan ventilation is an important function. ON Semiconductor offers single-phase and 3-phase motor drivers for BLDC motor drives for refrigerator ventilation, including single-phase pulse width modulation (PWM) soft-switching motor driver LV8861VH, three-phase sensorless pulse amplitude modulation (PAM) motor Drive LB11685AV, and three-phase sensorless PWM soft-switching motor driver LV8804FV and LV8805SV. These devices offer key features such as silent drive, energy efficiency, variable speed control and lock protection.
Among them, LV8861VH is a single-phase fan motor driver with a maximum energy consumption of only 1.3 W. The device has a VCC of 7 to 18 V and an output current of 1.2 A. The LV8861VH provides single-phase full-wave operation with a quiet PWM driver for quiet driving and high energy efficiency. This device can be controlled by PWM inputs to help speed design; other features include low heat generation, fast start-up circuitry, lock-up protection and auto-recovery circuitry, adjustable current limiters, and thermal shutdown.
Figure 2: LV8861VH block diagram and application diagram
The LB11685AV features a sensorless design that simplifies manufacturing; a soft start facilitates improved stability at start-up; a soft switch helps provide a silent drive; and a lock-on protection feature prevents damage.
Both the LV8804FV and LV8805SV are three-phase BLDC motor sensorless driver ICs. The three-phase driver supports low energy consumption and low vibration operation. The Hallless sensor driver supports reducing the size of the motor system. These two ICs are ideal for applications such as refrigerator fans and server fans that require high reliability and long life.
Figure 3: LV8804FV block diagram
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