Can anyone share the motor stall detection circuit? Similar to the motor stall detection circuit of door locks and sweepers,

QWE4562009

Can anyone share the motor stall detection circuit? Similar to the motor stall detection circuit of door locks and sweepers, [Copy link]

 

Can anyone share the motor stall detection circuit? Similar to the motor stall detection circuit of door locks and sweepers,

topwon

The sampling resistor converts the current into voltage, and then the ADC can be used for sampling...

QWE4562009

topwon posted on 2021-1-9 15:53 The sampling resistor converts the current into voltage, and then uses the ADC to sample it. . .

Well, the key is to use pure hardware in the case of MCU

QWE4562009

topwon posted on 2021-1-9 15:53 The sampling resistor converts the current into voltage, and then uses the ADC to sample it. . .

Well, the key is to use pure hardware in the case of MCU

topwon

QWE4562009 posted on 2021-1-11 15:45 Well, the key is to use pure hardware in the case of MCU

If you don't use an MCU, I think you can consider using two op amps, one as a follower to isolate the buffer and trim the signal waveform, and the other as a comparator to make judgments.

QWE4562009

If it is a special motor drive circuit (the motor is connected to two pins of the driver chip, not the ordinary one end grounded), to detect the motor stall current, can we just connect a resistor in series in the loop? And then use the MCU ADC to detect the voltage drop of the resistor?

maychang

QWE4562009 Published on 2021-1-12 10:09 If it is this kind of special motor drive circuit (the motor is connected to the two pins of the driver chip, not the ordinary one end grounded), detect the motor stall current, ...

If your MCU ADC is single-ended input (most of them are), then the voltage across the current sampling resistor must pass through an amplifier with differential input and single-ended output before it can be converted by the MCU ADC.

QWE4562009

maychang published on 2021-1-12 19:23 If your MCU ADC is single-ended input (most of them are), then the voltage across the current sampling resistor must be converted to single-ended output through differential input...

Hello, it is a single-ended power supply. Even if an amplifier is added, it still cannot solve the current of forward and reverse stall? Do you need an op amp powered by positive and negative power supplies?

QWE4562009

QWE4562009 Published on 2021-1-12 10:09 If it is this kind of special motor drive circuit (the motor is connected to the two pins of the driver chip, not the ordinary one end grounded), detect the motor stall current, ...

The motor driver chip has OUT1 OUT2, that is, PWM1 PWM2 is added to both ends of the motor, and the motor is not connected to GND

maychang

QWE4562009 posted on 2021-1-13 12:07 Hi, it is a single-ended power supply. Even if an amplifier is added, it still cannot solve the current of forward and reverse stall? It needs positive and negative...

"Do you want an op amp powered by positive and negative power supplies?"

Not only is a positive and negative power supply required, but a fixed bias is also required, or a precision rectification circuit is used to meet the MCU ADC input range requirements.

QWE4562009

Which of these three circuits can be used? The forward and reverse stall current of the motor must also be detected

QWE4562009

QWE4562009 posted on 2021-1-14 15:04 Which of these three circuits can be used? The forward and reverse stall current of the motor must also be detected

No one replied? If you know, please come out and give me some guidance.