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Hi and thanks for replying.
I will try to explain my schematic and the project in detail.
The requirement is to send a constant current pulse though the load resistor (variable from 1ohm to 15ohm) programmed via a DAC. The current pulse magnitude is settable from 100mA to 5A. The resistors are...
Hi
I have built a DC Active Load required to generate current pulses ,
(please check attached schematic)
Linear FET used : IXTK90N25L2
Minimum compliance Voltage required = 85V dc
Max load = 15E ( + 2E )
Max settable current = 5A (starting at 100mA)
Pulses ranging from = 5mS to 1S.
I have...
Hello
I realised one unknown action of this circuit.
As I explained previously , I have a voltage across a 5000uF capacitor as the compliance voltage.
I was being very careful , so I removed the connecting wire from the rectifier output to the +Cap and charged the capacitor to 55Vdc via a...
Thank you for the effort. Much appreciated.
So do you think that an ultrafast diode from the Drain to the Supply node may be able to protect the MOSFET short circuit from a probable parasitic inductance?
a UF4002 comes to mind.
I agree. I too have my doubt of the SOA for the MOSFET I used since the datasheet doesn't say anything about SOA below 100us!
1680797830
The 1k gate resistor is for loop compensation.
Hi
I am trying to build a constant current Electronic Pulsed load for 0-5A dc.
Pulse width(single) is settable from 5mS to 1S. The current magnitude is set via a DAC of up to 5V corresponding to 5A.
The Load is a resistive load. MOSFET is mounted on a big solid heatsink.
Please find the...
Hi and thanks for such an elaborate reply . Appreciated!
This project is about testing few parameters of a BLDC motor like sleep current , active current and current profile of the motor.
The PWM control is an inherent control available on the motor and it only expects a few Hz at varying duty...
Hi Klaus
I have understood your point. I was missing the fact that a switching device in a feedabck loop will sabotage the loop.
Secondly regarding the PWM control : Yes the Motor speed is controlled by PWM which is separately provided and is separate from the ON/OFF contol of the MOSFET.
Interestingly , when I keep the MOSFET on before turning on the motor (by providing duty cycle update) , the PSU functions as it should.
So i think there is some sense in what you have said.
One more intriguing point is that I have nowhere noticed the scheme which we are using.
I mean the...
That also won't help since then the voltage across the entire branch (excluding the R) will be measured.
Why does the Power supply run into OVP?
Any explanation you realise?
Hi
We are using a TDK GEN-60-40 Programmable Power Supply for testing few parameters for a DC motor.
As per conventional usage , the remote sensing terminals of the power supply (S+ , S-) are supposed to be connected to the actual load, so that the power supply will compensate for the cable...
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