Security and Protection for Embedded Systems

Motor Driver Circuit Design: H-bridge and PWM Speed Control: 1. H-bridge Drive Principle: - Four switching transistors form H-bridge structure - Control motor forward and reverse through different switch combinations - Control speed through PWM duty cycle adjustment - Freewheeling diodes provide current path 2. H-bridge Types: - Discrete Components: Low cost, flexible design - Integrated IC: Small size, high reliability - Half-bridge + Half-bridge: Suitable for dual-channel drive - Full-bridge Drive: Suitable for single-channel high power 3. PWM Speed Control Technology: - Frequency Selection: Above 20kHz to avoid noise - Duty Cycle: 0-100% corresponds to speed range - Dead Time: Prevent upper and lower transistors from conducting simultaneously - Feedback Control: Encoder closed-loop speed control 4. Protection Circuit Design: - Overcurrent Protection: Sampling resistor + comparator - Overvoltage Protection: TVS diode + Zener diode - Overheat Protection: NTC temperature detection - Reverse Connection Protection: Diode or MOS transistor 5. Application Scenarios: - DC Motors: Small fans, toy cars, robots - Stepper Motors: 3D printers, engraving machines - Brushless Motors: Hair dryers, vacuum cleaners - Servos: Drones, robots 6. BOM List: - Driver IC: DRV8833, L298N, A4950 - MOS Transistor: AO3400, SI2302 - Diode: 1N5819 Schottky - Capacitor: 100nF, 10uF - Resistor: Sampling resistor, pull-up resistor

← Makalelere Dön