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Time:2024-01-13 Views:1
1. Conduction loss: The conduction loss of the selected driving tube directly affects the efficiency and temperature of the driving circuit. Generally, MOSFETs have low turn-on voltage and small conduction loss, so they are widely used in practical applications. Although IGBT is not as excellent as MOSFET in terms of turn-on voltage, it has higher hardness during switching and can withstand higher loads, making it widely used in motor load situations.
2. Switching loss: In the process of driving brushless motors, switching loss is also an important indicator. MOSFETs have faster switching speeds and lower switching losses compared to IGBTs, making them an ideal choice for applications that require frequent switching.
3. Circuit voltage: The voltage range that the selected driver tube can withstand and the power supply voltage of the circuit need to be considered. For example, small brushless motors can be driven at low levels, while high-power brushless motors require high voltage drive. When selecting MOSFETs, it is usually necessary to consider the indicators of rated voltage, leakage current, and conduction resistance.
4. Circuit current: The characteristics of brushless motors determine that they will have high peak currents during operation, so the rated current of the driving transistor also needs to be considered. From this perspective, IGBT performs better in high current situations.
In summary, when choosing a DC brushless motor drive tube, it is necessary to choose a device with suitable performance and cost based on the specific application. Considering both the working environment and requirements, high-power brushless motors usually use IGBT as the driving transistor, while low-power brushless motors usually use MOSFET.
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