Which value?the value drops drastically
"Is not working" is no error description. You need to tell your test conditions, what you expect and what you see instead.but the main converter is not working
I meant toHi,
Which value?
"Is not working" is no error description. You need to tell your test conditions, what you expect and what you see instead.
All in all you give information about "it works". You show the "working" schematic.
But you don´t show us information of the "not working circuit".
(it´s like your bike is broken, but you give your brother´s good bike to the garage).
So all we can do is: guess.
* gate drive signals are wrong: We neither see the gate drive circuit, nor the voltage levels, nor the timing...
* Your PCB/wiring is wrong: I´d generally say a breadboard is not suitable for switching power applications. In best case a breadboard circuit does "something", but usually not with the expected performance. I expect ringing, oversoot, instability.. but it´s very likely it does nothing.
* your MOSFET are already killed by overvoltage. I expect high voltage, I expect spikes, but I don´t see any protection.
* other parts (like 1N4148) are killed. (you surely know that an 1N4148 is specified for 150mA (average rectified current @ good heat spreading)
* your circuit differs from the given schemaitc. Regarding wiring and/or part values. I guess you don´t really have a 17uF and and a 30uF capacitor ... and I guess you don´t use non polarized as in your
My recommendation for the non working circuit:
* focus on the malfunction
* take a sheet of paper and a pencil and draw down "what you expect". Do this for each node from signal input to output.
* after the drawings .. do the measurements and compare them with your expectations (drawings).
* on mismatch: find out whether your expectation was wrong or the circuit is wrong.
***
But you said you did a simulation. So you can see the timing, magnitude and waveform of every node.
This is the main benefit of a simulation. It (falsly) shows a working circuit, where a real circuit immediately gets killed by overvoltage or overcurrent. So use this feature to find out whether each of your used devices is operation within specification.
Klaus
Hi, I meant to say the DC voltage value from the supply. For example, if I supplied my circuit with an input voltage of 6V, as soon as i energize the circuit, the input voltage on the meter reduces to about 0.6 volts. Hence, there is no energy flowing in my circuit.Hi,
Which value?
"Is not working" is no error description. You need to tell your test conditions, what you expect and what you see instead.
All in all you give information about "it works". You show the "working" schematic.
But you don´t show us information of the "not working circuit".
(it´s like your bike is broken, but you give your brother´s good bike to the garage).
So all we can do is: guess.
* gate drive signals are wrong: We neither see the gate drive circuit, nor the voltage levels, nor the timing...
* Your PCB/wiring is wrong: I´d generally say a breadboard is not suitable for switching power applications. In best case a breadboard circuit does "something", but usually not with the expected performance. I expect ringing, oversoot, instability.. but it´s very likely it does nothing.
* your MOSFET are already killed by overvoltage. I expect high voltage, I expect spikes, but I don´t see any protection.
* other parts (like 1N4148) are killed. (you surely know that an 1N4148 is specified for 150mA (average rectified current @ good heat spreading)
* your circuit differs from the given schemaitc. Regarding wiring and/or part values. I guess you don´t really have a 17uF and and a 30uF capacitor ... and I guess you don´t use non polarized as in your
My recommendation for the non working circuit:
* focus on the malfunction
* take a sheet of paper and a pencil and draw down "what you expect". Do this for each node from signal input to output.
* after the drawings .. do the measurements and compare them with your expectations (drawings).
* on mismatch: find out whether your expectation was wrong or the circuit is wrong.
***
But you said you did a simulation. So you can see the timing, magnitude and waveform of every node.
This is the main benefit of a simulation. It (falsly) shows a working circuit, where a real circuit immediately gets killed by overvoltage or overcurrent. So use this feature to find out whether each of your used devices is operation within specification.
Klaus
Thank you for your reply.show the control please photo's and schematics ...
it does appear from the power hardware picture - that there is really very little chance of this university project ever working ...
"my car won't start - just the battery voltage falls when I turn the key " - " what is wrong with my car ? "
see the similarity to your post .... ?
--- Updated ---
what is the current limit of your power supply ?
--- Updated ---
1N5822 is only 40V rated, spikes can easily kill these - have you used your sim to see the voltages on the semis ?
I'm not sure how the circuit is supposed to work in general, posting the LTspice simulation circuit might help to understand it.
I'm however pretty sure that Q2 can't be driven by IR2110, because source voltage swings below GND. You didn't post the driver circuit, so we don't know how you connected it exactly.
Thank you for your response. I posted the circuit already. These are the currents and voltages inductors and output resistor.show the control please photo's and schematics ...
it does appear from the power hardware picture - that there is really very little chance of this university project ever working ...
"my car won't start - just the battery voltage falls when I turn the key " - " what is wrong with my car ? "
see the similarity to your post .... ?
--- Updated ---
what is the current limit of your power supply ?
--- Updated ---
1N5822 is only 40V rated, spikes can easily kill these - have you used your sim to see the voltages on the semis ?
Hi,
Which value?
"Is not working" is no error description. You need to tell your test conditions, what you expect and what you see instead.
All in all you give information about "it works". You show the "working" schematic.
But you don´t show us information of the "not working circuit".
(it´s like your bike is broken, but you give your brother´s good bike to the garage).
So all we can do is: guess.
* gate drive signals are wrong: We neither see the gate drive circuit, nor the voltage levels, nor the timing...
* Your PCB/wiring is wrong: I´d generally say a breadboard is not suitable for switching power applications. In best case a breadboard circuit does "something", but usually not with the expected performance. I expect ringing, oversoot, instability.. but it´s very likely it does nothing.
* your MOSFET are already killed by overvoltage. I expect high voltage, I expect spikes, but I don´t see any protection.
* other parts (like 1N4148) are killed. (you surely know that an 1N4148 is specified for 150mA (average rectified current @ good heat spreading)
* your circuit differs from the given schemaitc. Regarding wiring and/or part values. I guess you don´t really have a 17uF and and a 30uF capacitor ... and I guess you don´t use non polarized as in your
My recommendation for the non working circuit:
* focus on the malfunction
* take a sheet of paper and a pencil and draw down "what you expect". Do this for each node from signal input to output.
* after the drawings .. do the measurements and compare them with your expectations (drawings).
* on mismatch: find out whether your expectation was wrong or the circuit is wrong.
***
But you said you did a simulation. So you can see the timing, magnitude and waveform of every node.
This is the main benefit of a simulation. It (falsly) shows a working circuit, where a real circuit immediately gets killed by overvoltage or overcurrent. So use this feature to find out whether each of your used devices is operation within specification.
Klaus
Please what's the name of the simulator used in this illustration?Output calculates as 42 Watts. To get that from a 6V supply requires 7A average. I'm running a simulation of a basic boost converter. It shows that waveforms of 14 Amperes peak must go to the output stage (since it must happen during Off-time). It's the same amount of Amperes through your inductor, and drawn from your 6V supply.
Cuk and Sepic topologies have additional indicators and capacitors. They must carry that amount.
Parasitic resistance needs to be minuscule if it's going to work. A mere 1/10 of an ohm subtracts 0.6V from your effective supply voltage. I had to extend duty cycle to 75% in my simulation.
View attachment 178742
Also are you saying I increase my input current so as to achieve my desired output?Please what's the name of the simulator used in this illustration?
Thank you for your response. I'm a newbie in circuits design. I also need to come up with some novelty in my design, hence I'm trying something different from the conventional SEPIC converter.LTspice schematic confirms my doubt that IR2110 high side driver is operated beyond its working voltage range. The limitation might not appear in used simulation model.
I'd prefer a .zip archive of LTspice files, including any non-standard library files.
But the provided simulation circuit clarifies at least intended circuit operation.
Generally I wonder if you expect any advantage over a basic SEPIC converter justifying the higher component count.
I couldn't find current ratings on the inductors I used. I'm not sureWhat are the inductor current ratings?
Please what's the name of the simulator used in this illustration?
Also are you saying I increase my input current so as to achieve my desired output?
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