Usb To Parallel Converter

[Thora Buckner]

The Manhattan Full-Speed USB to DB25 Parallel Printer Converter with bi-directional data transfer easily supports USB-to-parallel and parallel-to-USB communication. Ideal for connecting USB-equipped desktop or notebook computers to a parallel printer or adding a DB25 female port, it helps deliver faster data transfer rates than a standard parallel port.

The Manhattan Full-Speed USB to DB25 Parallel Printer Converter is fully compliant with USB 1.1 specifications to help devices operate at maximum performance. Bus support and low power requirements permit its convenient and reliable use almost anywhere without the need for external power supplies.

Plug and Play capability and Windows compatibility help the Manhattan Full-Speed USB to DB25 Parallel Printer Converter to function on any USB-equipped computer or device. Installs as a Virtual USB Printer Port, the need for any further configuration is eliminated.

I am trying to figure out if I can have a MPPT charge controller in parallel with a DC-DC converter (sharing a solar array). I realize the MPPT charge controller is a DC-DC converter and I am also aware that two MPPTs in parallel will cause a possible conflict.

I would rather not get into the "why do this" since that can divert the topic. I am just curious, from a technical point of view, if a DC-DC converter under a constant load, can be placed in parallel with a MPPT charger without causing the MPPT to fail.

I am not sure about the type of isolation that would exist between the devices, but would expect at a minimum, diodes to prevent one devices input from feeding the other devices input. The outputs would be isolated (possible transformer) from each other.

The two devices would NOT be synchronized so I am worrying about them stepping on each other during switching times, but maybe that is not a valid concern if the two devices have the correct input capacitance to handle transients.

Yes, there is no problem in having another DC/DC converter in parallel to the MPPT controller. In effect, it will be like a resistor connected across the panel. You can see that many MPPT reference designs already have this in the form of an auxiliary power supply running off the panel.

Please see the designs TIDA-00120 & TIDA-00476 to see auxiliary power supplies powered from panel. Typically, the auxiliary power supply input will be OR'ed between the battery voltage and the panel voltage. Since the panel voltage is higher than the battery voltage, it will be powered from panel during day time.

Thanks for the reference designs. TIDA-00476 may prove to be useful in my application. However, what I am interested in is a device that can simultaneously allow part of a solar arrays power to be delivered to a DC load and the rest of the power diverted to a charge controller. TIDA-00476 acts as a buck charge controller OR a boost CC-CV power source using the batteries as the input source. If you imagine this reference design being able to do both functions simultaneously, then you would have the device I am looking for.

Sorry to have missed out on this thread. If you look at the schematic closely, you can see that the auxiliary power supply is a DC/Dc converter based on UCC28880> This is running in parallel to the main MPPT power stage. Of course, the power that can be taken through this path is limited; but I think you can safely increase this power draw to at least about 20% of total power from the panel without seriously impacting MPPT tracking.

Yup! I have a Pilot Parallel 6.0mm. It came with several cartridges and a simple squeeze converter "for flushing the pen". I ignored the cartridges and used the converter - I have it filled with Noodler's highlighting ink - makes a great refillable highlighter!

Don't throw away the cartridges. They all come with little metal balls to shake the inks which the regular ones doesn't have. I would drain out the inks and put in my favorite noodlers for my various Pilot FPs.

The cleaning converter and a Con-20 both fit the PP just fine. When you install the converter it takes a bit of force to seat the converter on the grip section. Not sure if the new PP pens are any different from when the video was made that Rachel did. I plan to get a Con-50 just because I like to see how much ink I have left.

I looked at the camera specifications and reviewed the 12-bit Base Camera Link, and I believe that you should be able to use receiver half of the FLINK3V8BT-85 inputs as a prototype, seeing that the CameraLink Serializer is already built into the camera:

Please note that the DS90CF386 on board the FLINK3V8BT-85 strobes the output parallel data on the clock's falling edge. If you wish for a similar receiver device that strobes on the rising edge, I recommend looking at the DS90CR286A.

However the DC-DC Boost coverter (XL6009) is rated at 2A continuous input. So I've decided to connect 3 DC-DC Boost converter in parallel, so each of them share the load and keep everything cooled down. Did some googling and I'm not sure if this is a good idea, some say the small different in output would fry the converter with lower output over time.

The device that produces the highest output voltage (fractions of a few milli volts over the others) is the device that wins the race to supply all the current and will eventually burn or shut down. Then, the device that produces slightly more output voltage then the third device (but less than the first device) will win and it will continue to supply current until it burns or shut downs leaving the third device and that eventually burns or shuts down.

However, as the first device warms it's output may reduce and gracefully start to share load duties with the 2nd device and this may extend to the third device but this is usually a bit of a fairy tale and won't happen / can't be relied on.

There are probably other scenarios but those involving output diodes fall into scenario 1 because the diode acts to prevent the current dumping mentioned in scenario 3. Diodes also drop anything up to 1 V and so energy is wasted and power is lost.

You can use a current mirror to actively and accurately divide the power load between your three DC-DC boosters. All you need is just one NPN transistor for each booster. I have used three cheap TIP31s, but any medium power type would do, as long as they are all the exact same model. This is because a current mirror depends on all transistors having very simmilar properties regarding beta, thermal behaviour, etc.Building the current mirror is very easy: connect the collector od Q1 to the output od booster 1, collector od Q2 to output of booster 2, and collector of Q3 to to output of booster 3.The emittors of Q1,Q2,Q3 are to be tied together. This is your new combined power output, going to the input of your load.Next, connect all the bases together, and then - this is important - connect the base of Q1 also to the collector of Q1. Do this last step only with Q1. Q2 and Q3 (being the same model and sharing a common base with Q1, will therefore behave nearly identically and copy the the collector-emitter current of Q1, no matter how much higher the booster 1 and booster 2 voltages are.Lastly, you need to adjust your booster output voltage to compensate for one diode drop (because your transistors are now emitter followers).For 12v output, set booster 1 to 12.6v and booster 2 and 3 to 13v (they need to be equal or higher than booster 1 to be able to copy Q1's current, but this will not affect your output at all, because it is now actively controlled.)So, what have we gained from this approach? Same current through all parallel boosters times same output voltage (emitters are tied together) equals exactly same power delivered by each booster, no matter what the load, and no matter what the (higher) voltage of booster 2 and 3. Ohms law. And unlike just using resistors, the output voltage will remain nicely constant as regulated by Booster 1, no matter what the current draw of your load is.I hope this is helpful.Mike3301

I'm reading that a current mirror made from discrete mosfets can't be used because you won't find more than 2 in box of 500 mosfets similar enough in voltage and gain - so the expenses, in purchase of 500 items, and then the time to find the matching pair, is large.. Then the matching Mosfets might be used only for low current. In practice, mosfets can be used in low current application in an IC design, because there close proximity in the IC ensures they match well enough .. but temperature variations prevent their use in high current even so.

Yes, best option is to buy a more powerful module, but is almost always at least double the price of multiple modules in parallel of the same total current or more.Right now i'm using 6 modules in parallel to give me a boost of 28V 30amp from 13V 80ampeach module has a output diode. What Andy says about one module that is set to a few milivolts more gives more current, is true, but only in few miliamps so really not a problem. Moreover, each module has a overcurrent protection so natturally if one gives more current, the protection automatically lowers the voltage thus the system is working flawlessly.

LibreOffice opens and saves files in a single thread. Additionally, LibreOffice makes sure to only run single process using a given user profile. Hence, whenever you use --convert-to without specifying different user profiles, even if you run these commands in parallel, all these calls will be serialized in one worker process.

Your only solution would be to use several user profiles. Then each profile would mean separate process, and so your CPU utilization (as well as memory load) would increase. See the -env:UserInstallation example in the Starting LibreOffice Software With Parameters.

Note however, that using a separate profile for every converted document for hundreds of files would likely not increase efficiency, but to the contrary, is likely to decrease it. If you would use some /tmp/random_name profile for each file, LibreOffice would need to startup, generate the new profile, do the conversion, and shutdown. The startup, profile creation, and shutdown overhead might cost more than the parallelization could offer. Knowing your CPU, create several directories with files to convert, according to the desired threads number, and issue one --convert-to command per each such directory in parallel.