An embedded system is a "special computer system that is completely embedded inside a controlled device and designed for a specific application." For control, monitoring, or auxiliary equipment, machines, or equipment used in factory operations, the core is made up of one or several pre- Programped with a microprocessor or microcontroller that performs a few tasks. This article will introduce three application circuits based on embedded technology, namely motor drive controller, SOHO router circuit and embedded speech recognition circuit.
Motor drive controller
The DSP chip and the peripheral circuit are used to form the speed capture circuit. The motor drive controller uses the micro-control chip and the peripheral circuit to form the circuit of current sampling, over-current protection, pressure regulation, etc., and realizes the logic change of the rotor position signal of the brushless DC motor by using CPLD. phase. The racing brake controller consists of an anti-skid controller and a motor drive controller. Both controllers are based on DSP chips. The anti-skid controller is mainly controlled by the slip rate, and outputs a given brake pressure. The DSP chip is used as the CPU, plus the racing wheel and the wheel speed signal conditioning circuit. The motor drive controller mainly adjusts the brake pressure and controls the motor current. It also uses the DSP chip as the CPU, plus the peripheral circuit motor current feedback conditioning circuit, overcurrent protection circuit, brake pressure conditioning circuit, and four sets of three-phase full bridge. The inverter circuit and the like constitute a motor drive controller.
Signal processing circuit: The anti-skid controller is mainly controlled by the slip rate to prevent the car from slipping. The pressure reference value is adjusted by the deviation of the slip rate to track the given slip rate. The anti-skid controller must have a conditioning circuit for the front wheel and brake wheel speed signals, mainly to obtain the feedback slip rate. The racing speed signal is replaced by a free-rolling front wheel speed signal. The speed sensor is installed on the front wheel and the brake wheel of the car. When the wheel rotates, the speed sensor generates an AC signal in the form of a sine wave. Each time the wheel rotates, the speed sensor emits a 50-cycle sinusoidal AC signal. The amplitude of the sinusoidal AC signal varies with the speed of the wheel. The signal is a sine wave signal with a bias voltage of 2.5V, a peak value of 0.3V, and a maximum signal amplitude of no more than 5V.
Current sampling and overcurrent protection circuit: The current of the brushless DC motor is detected by the resistance on the bus of the power drive circuit. The resistance above the busbar is connected in parallel by two 0.01Ω power resistors. The sampling circuit samples the current through the two parallel sampling resistors. The sampling resistor converts the current signal into a voltage signal, and the voltage signal is sent to the current monitoring chip for amplification. Then, the second-order active filter circuit is constructed by OPA2344 ($0.8875) to filter, and finally the current feedback signal is sent directly to the A/D converter.
The hardware overcurrent protection circuit plays an important role in the normal operation of the system, mainly for the protection of the power device MOSFET and the motor. The system also has a software protection function. The overcurrent signal OVCURX is sent to the input pin of the DSP. When OVCUR is high, the DSP will generate a motor control rotation signal ENABLE to turn off the logic signal to stop the motor. The chip IR2130 ($5.6212) has its own overcurrent protection.
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