Intercepting PWM signal

12 years 1 month ago #29526821 by Anonymous
Intercepting PWM signal was created by Anonymous
I want to use one of your boards to power an automobile. I don't want to use the onboard MOSFETs. I want to intercept the PWM signal and use the signal to drive some Powerex IGBT gate drivers. These Powerex gate drivers optically couple the PWM signal to the gate driver circuitry. I will also need to monitor a much higher motor amperage and feed a signal to the Roboteq board so the board can shut things down if the amperage gets too high. I will also monitor motor temperature. Is it possible to intercept the PWM signal and route it off-board?

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12 years 1 month ago #29526822 by Roboteq
Replied by Roboteq on topic RE: Intercepting PWM signal
If you connect the output of a controller (example the AX1500) to a resistive load, you will have an exact replica of the PWM on the voltage across the resistor or the current flowing through the controller.
Direction inversion is signaled by the current inverting direction.
Alternatively side A of the resistor will switch in voltage while side B is connected to ground giving a clean PWM signal. Direction inversion is signaled by side B switching and side A becoming grounded.
From here it is rather easy to build an interface.

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