1000V, 1500V, 1500VAC,...really depends on the UL classification you are shooting for. I've seen UL hipot voltages from 500VAC to over 2000VAC. For voltages greater than 50V, the hipot voltage is typically 1000VAC + 2 X Rated Voltage (again, depending on the Standard to which you are trying to...
ItSmoked,
"Perhaps the TV was up too high and you miss interpreted" what hrc said the circuit wants/needs :).
hrc wants/needs a circuit that will give 5V @ 100mA out from a 3.3V input source and that will have up to 1500V isolation between input and output.
My dad has been a self taught electronics technician since he was a teenager. He was fixing transistor radios since he was 13. In fact both of my grandfathers were electronics fix-its, but nowhere near at the same level as my dad. A lot of people may not think much of him, but I have always...
Yeah, like my second paragraph...
Martek Power,
C&D Technologies,
International Power Sources,
Unfortunately, my experience with one of these isolated DC-DC converter solutions resulted in about 100mV of noise riding on my 5V rail.
Sorta Back to the second original question loosely regarding the operation of light dimmers (some light dimmers, anyway); when I was a kid my dad told me the white knob controlled a variable capacitor. At the time I had no idea what the heck he was talking about, but now, I presume the variable...
You could always design an inverter using only enough secondary turns on the output for 5V. Zetex has some App notes showing how to design an inverter using their medium power BJT's.
Have you considered using PCB mounted isolated DC-DC power supplies? The isolation of such an animal (if you...
...and, of course, #define statements available in a header file or at the top of the code are always good for making code portability from micro to micro much more convenient - all you have to do is copy the code from micro to micro and update the #define statements...
I would assume the actual current the DMM supplies varies from DMM to DMM, etc...In my experience, the diode voltage is usually slightly lower than what you might expect. A DMM I use at work supplies about 16uA if I remember correctly (measured it with a second DMM).
To add to itsmoked's post, verifying the diode in the forward biased direction (should read some small voltage 0.7V to 2 or 3 volts) will be accurate as long as there are no components connected in parrallel to the diode (atypical case). Verifying the diode in the reversed biased direction...
If you are referring to using the actual PWM peripheral of a given PIC product, then you will be limited. If, instead, you use a timer interrupt and handle each PWM output individually within the ISR (for example), you should be able to have as many PWM channels as you have available I/O. In...
nbucska, are you saying across the input of your circuit you have a 1,000uF cap and you are wondering if this capacitive load would affect the contact life with the surge current associated with DC input voltage source suddenly applied to an otherwise discharged cap? I suppose there is a chance...
Yes, that is true...back to the question regarding agency listing.
During my days working for a custom automated test equipment outfit we never had any kind of agency listing and we never hipotted anything. Amongst many other things, our equipment was responsible for controlling a hi-pot...
Is this for some agency listing? If so, then you would just have to become familiar enough with the applicable standard, etc...
The most common hi-potting scenario with which I am familiar is hi-potting between all the wires tied together and the control panels. If all the wires are tied...
I think limiting the ON and OFF time of the BJT's is something to consider, but there are some additional circuits you can use to absorb the extra energy from the inductor. I have been told BJT's are more 'forgiving' when it comes to voltage spikes than MOSFETs, and, as you mentioned above, the...
With a DC-DC converter, the current is, of course, maintained at a fairly constant value by the inductor. If the load is suddenly removed, the inductor current will have nowhere to go (therefore the inductor voltage climbs without bounds). You will have to carefully watch for the outcome of...
If the number of batteries per device you are designing is constant (for example a design that runs off 4.8V from four rechargeable cells) you can determine what kind of cells are installed by looking at the battery voltage...Back to the example above:
4 X 1.5V (alkaline) = 6.0V
-as opposed to-...
Okay, so you are designing one low voltage rail (3-4VDC) for multiple parrallel loads and you will be PWM'ing the loads individually with the chance of all loads being removed simultaneously. I say go for it...
I have been told such a thing is essentially not possible to do without trouble...
Bodine makes an Arc maintenance ballast that is UL924 rated for damp locations. It can maintain the arc for up to two minutes, giving the generator plenty of time to get started up.
Are you pulse width modulating the control of the assumed buck regulator, or are you making and breaking current to the load? It might be safer to modulate the control of the regulator, in fact I think there are plenty of buck regulators ICs that accept PWM control inputs (for tens to hundreds...
MrKenneth, ItSmoked mentioned impedance matching on June 19th. I haven't seen any posts since then regarding impedance matching, but Motorola (Freescale,...whatever) has an App Note in which you might be interested: AN267, "Matching Network Designs with Computer Solutions". For four different...
