Thermal simulation;
ambient temperature = 30 deg, unidirectional airflow.
max temp = approx. 107 deg C, min temp = approx. 57 deg C
operating temperature range of inverting controller = -40 to 125 deg C
ambient temperature = 30 deg, unidirectional airflow.
max temp = approx. 107 deg C, min temp = approx. 57 deg C
operating temperature range of inverting controller = -40 to 125 deg C
Output noise: the output voltage fluctuates from the theoretical +12V
Design of inverting circuit based on Linear Technology LT3758F controller
It looks like the electronics problem of the filament has been solved. Now it leaves the mechanical design for the filament, which is easy. To be honest, finishing this part isn't an entirely happy feeling - because it means that the difficult part of the electronics for the project has begun. But there's more fun math involved in focusing the beam with the electromagnet. I guess it's not all that bad.
Was a busy day, figuring out the groceries for the week. I dropped salad from the menu for now - I can't find shredded mozarella with red cheddar to go with it. Or rather, I found those but above the equilibrium pricing. My hand needs surgery. Seems serious. No other solution. Will talk about this later.
Mood: Mendelssohn, Etude in A Minor, Op. 104b No. 3
I was advised 2 ways to generate a negative voltage. I spent today studying the catalogs, researching the costs, analyzing the efficiency and simulating the operation of the circuits. Had to print a 9 page report just for this! (Compiled it to my main report... will update soon.)
- Make a new power supply circuit with a center-tapped transformer, giving me a split supply.
(Advantage: Low noise in output voltage; can attain desired high voltages/currents
(Disadvantage: More costly to implement because of the necessary transformer.)
- Use my existing PSU, and run 1 of the +24V rails through an output inverting circuit.
(Advantage: Much cheaper - I just need a DC-DC converter and a couple of small components.)
(Disadvantage: Noise; output voltage/current limitations)
I already have 3 x 0V reference voltage rails on my PSU. And thinking through, it is much more convenient if I could use my existing PSU. I'll find thicker nichrome wire, decrease the resistance and compensate for the decreased current density from the lower current supplied. So, the 2nd option seems more economical. Now, National Semiconductor's WEBENCH program really pwns. I wish all of the hardware manufacturers had something like it. It designs the desired circuit for you, and even suggests existing components with catalog numbers from other manufacturers.
- Make a new power supply circuit with a center-tapped transformer, giving me a split supply.
(Advantage: Low noise in output voltage; can attain desired high voltages/currents
(Disadvantage: More costly to implement because of the necessary transformer.)
- Use my existing PSU, and run 1 of the +24V rails through an output inverting circuit.
(Advantage: Much cheaper - I just need a DC-DC converter and a couple of small components.)
(Disadvantage: Noise; output voltage/current limitations)
I already have 3 x 0V reference voltage rails on my PSU. And thinking through, it is much more convenient if I could use my existing PSU. I'll find thicker nichrome wire, decrease the resistance and compensate for the decreased current density from the lower current supplied. So, the 2nd option seems more economical. Now, National Semiconductor's WEBENCH program really pwns. I wish all of the hardware manufacturers had something like it. It designs the desired circuit for you, and even suggests existing components with catalog numbers from other manufacturers.
It looks like the electronics problem of the filament has been solved. Now it leaves the mechanical design for the filament, which is easy. To be honest, finishing this part isn't an entirely happy feeling - because it means that the difficult part of the electronics for the project has begun. But there's more fun math involved in focusing the beam with the electromagnet. I guess it's not all that bad.
Was a busy day, figuring out the groceries for the week. I dropped salad from the menu for now - I can't find shredded mozarella with red cheddar to go with it. Or rather, I found those but above the equilibrium pricing. My hand needs surgery. Seems serious. No other solution. Will talk about this later.
Mood: Mendelssohn, Etude in A Minor, Op. 104b No. 3
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