Motor current detection system scheme based on ADSP-CM408 and AD7403

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Single chip microcomputer STM32L151CCU6

Test - lowercase jpg

Kaixin micro test

The current loop is the core of motor control. The CM408F-MPC development platform covers all phase current detection functions in motor applications, supports the design of motor current loops with different power levels, and realizes the current acquisition and PWM of current loop circuits completely and accurately. Signal modulation, on-chip ADC signal link conditioning and acquisition, encoder position signal acquisition, provides open loop control of the motor, and provides customers with a complete hardware design and graphical PC software to quickly evaluate performance. And shorten the design cycle.

For medium and small power motor applications, the CM408F-MPC development platform provides the AD7403 current sampling of the isolated analog-to-digital converter. The external current loop is converted to the corresponding shunt voltage input to the voltage test terminal of the AD7403 through the shunt resistor. The AD7403 outputs the clock signal according to the CM408F. ADC bit stream, CM408F enables the built-in SINC filter for the input bit stream to calculate the corresponding 16-bit ADC value, and the data is stored in the corresponding ring queue by DMA. The host computer software can pass the UART-USB port. Or the RS485 port can obtain the display of the data sample, which can visually see the collection effect of the AD7403, and can store the collected data into an excel table, which is convenient for the corresponding analysis of the data.

For high-power motor applications, the CM408F-MPC development platform provides an input based on the ADSP-CM408 high-performance 16-bit SAR ADC. The corresponding signal conditioning circuit enables 0-2.5V signal input and supports Hall devices. +SAR ADC application.

The CM408F-MPC development platform provides a set of digitally isolated PWM signal outputs that can be adjusted by adjusting the adjustable resistors. During the adjustment process, the corresponding signal can be observed through the corresponding interface to observe the change of the corresponding signal.

The CM408F-MPC development platform provides encoder position information through the A/B/I signal interface. The interface also uses digital isolation. Through the automatic loop acquisition of the host computer, the current position information can be observed in real time. The customer can follow this information. The speed is calculated by the M/T algorithm.

The PC software designed for motor current loop application has waveform display, acquisition data display, encoder display and PWM dead time setting function. After the serial port parameters are correctly set and the serial port is successfully opened, the cyclic acquisition can be started. The software sends a data acquisition command according to the set cyclic transmission cycle. The CM40X-MPC motherboard returns the collected data according to the command, and displays the corresponding data.

Hardware interface:

• 2-channel SAR ADC input (0 – 5V voltage measurement)
• 2-channel 7403 isolated ADC input (±250mv)
• 1 A/B/I signal magnetic encoder interface
• 1 set of digital magnetic isolation PWM interface
• IPM module FO signal isolated input
• 1 UART to USB interface
• 1 RS485 interface
• 8-channel optocoupler isolated signal output
• 8-channel optocoupler isolation signal input
• 1 CAN interface
• 4 LEDs

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