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mtwieg, duty cycle is (on time)/period, so d=0% means every FET should be turned off. The first case is what I want, when I say that I suddenly turn the potentiometer so that d=0%. Problem is in the transition of duty cycle from non-zero(let's call this d_initial) to zero (see example in my...
Okay here's a brief description of the motor controller...
The controller is a dspic33fj128mc804. The three hall effect sensors from the bldc are received by the Input Capture module of the dspic. Each input capture has its interrupt enabled so that whenever a hall effect change occurs, an ISR...
Hi,
I would like to clear up that the intention of the sudden step down of duty cycle is to rapidly transition from motoring mode (wherein power is supplied to the motor) to freewheeling mode(wherein all MOSFETs are turned off). This means that the motor should not experience any braking. The...
Hi guys,
I have a bldc motor driven with 6-step trapezoidal control. The motor is 48V, 2kW rated. The motor driver is the traditional inverter consisting of 3 half-bridges for the three phases of the motor. MOSFETs are used in the half bridges. The switching frequency is 16kHz. All the 6 PWM...
I see. So the 1uF ceramic capacitors possibly have overall lower impedance at the frequencies concerned, due to lower parasitics. And this translates to better sourcing/sinking of very fast current transients.
But from the point of view of electrical charge that needs to be supplied per...
Hi all,
I am building a dc-dc boost converter with a UCC27254 (up to 5A peak current source/sink) to drive the low side mosfet. My input voltage is 20V at minimum, and switching frequency is 100khz. I am using an LM7815 linear regulator directly connected to the input voltage, to generate a...
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