RD6006 Linear Version Part1

[@Bata.andrei]

I built the linear version of the RD6006. Due to mostly of the lack of time I couldn't wind my own transformer, so I ended up using a 60v/5a I had lying around. After rectification I got 72V wich was triggering the input over voltage alarm of the Riden. So I dropped the voltage further by putting two diodes in series at the input of the RD. The voltage dropped to 70.2 V and the RD seems to be happy with it.

[@JerryWalker001]

Sounds good, Unfortunately UK transformers are significantly bigger for the same VA so I could not use a single transformer unless I dropped to 300VA. Note that the primary of your transformer is almost certainly the last winding so you could just add a few extra turns to the primary to drop the voltage of the secondary. That would give you better performance. I did look at buying a couple of ready made transformers but apart from the cost I thought that the videos would be more interesting if I tried a diferent approach.

[@robisr384]

Isn't a multiplier for voltage after rectification x1.41? I already unwinded secondary down to 50V ac hoping for 70 volts after rectification...

[@Bata.andrei]

@@robisr384 it is, but you need to take into consideration the losses of the transformer and the forward voltage drop of the bridge rectifier. 50v ac seems a bit on the low side, but I think if you use a schottky diodes bridge rectifier, like Jerry uses, you should be good. You also need to keep in mind the "sag" of the output voltage of the transformer. When unloaded or with a light load attached, you will get a higher voltage.

[@robisr384]

@@Bata.andrei I have just made a simple test with 5w 680ohm resistor (resulted by ~3.7 watts load on 50V) and there was no sag of voltage...It seems that domestic manufacturer of this toroid did a good job building this transformer... I ordered shottkeys (s60sc6m), rectifier filter capacitor board which I have to modify a little and 8x4700uf 100v caps...hoping for good results

[@DIYTAO]

Hi, I love your videos of these power supplies, I was just thinking on getting the 6012 kit and found these videos extra usefull. Thankyou for making these. If I may, I'd like to point out one area of refinement. Especially on this video there is very audible low frequency hum.. Around 6:20 it's really loud. As a part of video making i'd recommned using rumble filter (perhaps 80Hz high pass). Besides that, audio quality is really good..

[@enzo_iw7dmh]

Hello Jerry and thank you very much for your RD6006 videos series. I have no such skills to adapt any ring transformer to my needs, but I am interested in building my linear RD6006 project. So I would be glad if you could publish the reference specs for a commercial ring transformer. Just to buy one of it from a online shop. Following your calculation it should be fine a 240v/48V AC model that could drive the RD6007 with a DC voltage of 65.7 V (after the rectifier/stabilizer circuit). I am also missing some power considerations: 60v x 6A = 360 Watt, so I think I should find a 400VA model. Any help will be appreciated. Best regards Enzo

[@CliveChamberlain946]

Best firmware for 6000 series is on EEVblog. Google *UniSoft RuiDeng Riden RD6006 DC power supply* for forum. Below is the Change log. You can always return to stock firmware at anytime. In case of any problems while update, keep pressed [ENTER] while power on device, to run device in BOOT mode. RD60062_V1.32.x.bin - my custom firmware. (where x - is the build number (sub-version)) RD60062_V1.32.bin - original (stock) firmware. If you want to return to stock firmware, recommend to set default setting To do this: keep pressed button [0] while power on device. --------- History: -------- --- RD60062_V1.28.1.bin --- * Initial version * Optimized, get rid of HAL Libraries... switched to LL --- RD60062_V1.28.2.bin --- + The menu was complete remade, now I can easy add new items. + [SHIFT] + [Left/Right] - switches the current layout (without save in settings) (if need to set layout after power on, then can do it over settings menu, as before). + For 'layout 1', can be enabled/disabled items. + Added OPP (Over Power Protection). + [SHIFT] + [MEM] - used to setup OPP + OVP, OCP, OPP - now can be disabled by setting it to 0 + When entering OVP, OCP, OPP, SHIFT button will be highlighted as well (to visually distinguish input: V-SET from OVP, I-SET from OCP). + The RIGHT button now works as a Backspace when typing. + When turned on the internal fan (the one that is on the module itself), icon will be displayed. --- RD60062_V1.28.3.bin --- + Added setting for current cutoff in battery charger mode. + Added setting for batt temp. cutoff in battery charger mode. + Added Battery Charger Layout + Added Setting to skip keypad lock when connect with software. + [MEM] + [.] - now used to reset Wh, Ah --- RD60062_V1.32.1.bin --- * Updated to version V1.32 * Bug fixes --- RD60062_V1.32.2.bin --- * Bug fixes + Option "Digits Style", can select style for large digits (32x64, 12x24, 7-Seg) + Decreased minimum battery voltage from 900mV to 300mV --- RD60062_V1.32.3.bin --- + Support WIFI * Bug fixes --- RD60062_V1.32.4.bin --- * Fix TTL Interface --- RD60062_V1.32.5.bin --- + Option "SkipExitIVSet" (prevents exit from edit mode for V-SET and I-SET when press ON/OFF button). * Bug fixes --- RD60062_V1.32.6.bin --- + Option "Standby LED" (Setup the behavior of the power button LED in power off mode (Default-pulsating, 0%-off, etc...). (in modes 0% and 100% power consumption will be less (cause no need software generate PWM and can switch MCU in to the sleep mode) * Bug fixes --- RD60062_V1.32.7.bin --- + In power Off mode now using hardware PWM (except pulsating mode) for Power LED and turning off unnecessary peripherals, to decrease power consumption. + Remade function to enter values. * Bug fixes --- RD60062_V1.32.8.bin --- + Option "Save Mult." to save current multiplier (for current session only, reset after restart) * Increased minimum battery voltage from 300mV to 500mV (Due to some instability) * Bug fixes --- RD60062_V1.32.9.bin --- + Added option "Power State" (Power On, Power Off, LastState). Sets the state after power on (without a battery, LastState will not remember the last state). + Added option "Power Switch" to turn On/Off the primary PSU. (5V standby power supply required). (Note: Adds a 3 second power-on delay). The control output is routed to the PA14 port (pin 4 of the J2 connector). High level - turn on, floating or low level - turn off. Note: the maximum load on the port is 20mA !!! (it is better to use an optocoupler). + Added option "AutoPowerOff" to automatically turn off after a specified time if the output is disabled. + Added option Home:"Status Info" allows you to choose which parameter to display in the status bar (if you need something else, let me know). + Added option Home:"Mem Hint" If enabled, then pressing any number key will display a hint with the current settings in the corresponding memory cell for 1 sec, a second click during this time will apply these settings. + added new parameter "7-Seg v2" to option "Digits Style", where "input", "vset", etc. will also be 7-segment. + Added display of the system temperature to the caption. + Minor improvements --- RD60062_V1.32.10.bin --- + Added option "Screensaver" to decrease brightness (ScrsaverBright) after specified time. (Note: "ScrsaverBright" must be less or equal to "Backlight") Press any key (except ON/OFF) will turn on backlight and restart timer. + Added option "ScrsaverBright" Screensaver Brightness (0-complete turn off backlight, 1-equal to "Backlight"=0, 2-equal to "Backlight"=1, etc) + Added option "ScrsaverActive" Allow activate screensaver if output is in active state. + Removed meaningless icons from the caption. + [Left/Right] - switches the current layout (without save) (no need press SHIFT anymore) - Removed Layout 2 (Layout 3 already shows all values). + Minor improvements --- RD60062_V1.32.11.bin --- + When edit "ScrsaverBright" or "Standby LED" now you can see the real effect... + Added option "Comm Buzzer" make a sound when the software writes new parameter(s). + Option "Mem Hint" now can select the time how long show the message (2, 3, 5 sec) + Added option "ShiftMemTable" Press SHIFT to display the table with settings for all memory slots. + Added new menu group "- Colors -", now you can choose what color (one of 15) to use for the next parameters: Voltage, Current, Power, Input, V-Set, I-Set, OVP, OCP, OPP, Ah, Wh, Temp, BattVoltage, BattInfo (Layout 2). Option "Custom Color" allow to use selected colors (using this option you can enable/disable custom colors in bulk). Option "Test" is just temporary option and will be removed in next release, can be used to see any color and its hex value. List of colors need be adjusted, if you have any ideas just let me know (tell me hex values). Here is the current list of colors: const uint16_t g_colors[16] = { 0, // 0 - Default C_RED, // 1 = 0xF800 C_GREEN, // 2 = 0x07E0 C_BLUE, // 3 = 0x001F C_WHITE, // 4 = 0xFFFF C_YELLOW, // 5 = 0xFFE0 C_MAGENTA, // 6 = 0xF81F C_CYAN, // 7 = 0x07FF // C_LIGHT_BLUE, // 8 = 0x01CF C_GRAY, // 9 = 0x8410 C_BROWN, // 10 = 0xA145 C_ORANGE, // 11 = 0xFD20 C_OLIVE, // 12 = 0x8400 C_TEAL, // 13 = 0x0410 C_PINK, // 14 = 0xFDF9 C_MAROON // 15 = 0x8000 }; --- RD60062_V1.32.12.bin --- * Bug fixes + Some Improvements + New option "Max Power" to limit the power of primary PSU. (came from RD6018). + Fixed Layout 4 + Added more options for Layout 1 (Note: only first 6 will be displayed). + Added function to dump the screen (make screenshots) (real dump from LCD GRAM), but this function a little bit slow, takes around 13-15 sec (need transfer 320*240*2 bytes over UART). + modified French translation (still need to make translations for German, and Chinese.) + Added Russian Language + Font for menu was changed to Terminus + ENTER can be used to exit from menu.

[@davecc0000]

Please provide links to the components you use. Link please to the +/- supply pcb that you are repurposing as a filter.

[@williamhardy4328]

I've been wondering if I could do something similar with a variac and an isolation transformer for safety. Main reason I wanted to give it a try is that I already have a very nice PowerStat variac and am already in need of an isolation transformer for general benchwork usage. Also if the DC supply dies, I can order a wider range of replacements since I can adjust the input voltage. I'm just worried there's something I'm missing even though I've tried to read a lot about doing it safely and without breaking something. Does this sound like a reasonable setup to anyone?

[@sgs2-595]

What about R type ferrite core transformer ? Compare with toroid type, can you please do a comparison video, by the way it is a very good and informative channel, great job!!

[@Bata.andrei]

Because of the low saturation flux, the ferrite core can not be used in low frequency transformers. Typically, ferrite core is used in transformers that work with frequencies over 10kHz. Afaik there are ferrite types that can work in applications as low as 1 kHz. For low frequencies transformers, like the one Jerry needs, the iron core, be it toroidar or the classical E+I, is the best.

[@frogandspanner]

5.34: What is that connector block called, and where can I get one? I remember them at school in the '60s and thought be might be illegal now (I still remember a school chum twitching on the floor after using one incorrectly).

[@JerryWalker001]

Mine is called John. They are one of the few things that are still legal :) Available in many places such as www.ebay.co.uk/itm/MAINS-QUICK-TEST-SAFE-BLOCK-TEMPORARY-230V-CONNECTOR-13A-for-WORKSHOP-REPAIRS/112606034274?epid=652377813&hash=item1a37d7b962:g:fWgAAOSwAC1Z5iP2 (Please note that I do not have any affiliation with this seller and cannot vouch for the quality or safety of this device).

[@tannerbass7146]

Hey, heads up if no one has mentioned this before. I've noticed that my RD6006 won't readjust it's max output if the input changes. As in, if the supply is at 13.8V unloaded, the RD6006 will max at 12.8V as expected for the built-in 1V drop. But if my input supply droops by any amount when loaded (as most supplies tend to do), the RD6006 will still try to output the original 12.8V limit. I haven't tested this to any extreme yet (like using an unregulated supply). So I have no idea if the RD6006 will readjust at a critical threshold (below 300mV drop?). Or if it might just go bonkers if the supply droops too much?

[@JerryWalker001]

I did test this on my first unit and once the switching reaches maximum then the output will start to droop if the input voltage is lowered either due to current limiting or maximum voltage being reached. It seemed to do this is a fairly predictable way but in light of your comment I will carry out a bit more testing. The supply does not seem to turn down the maximum voltage allowed to be set based on input voltage being lowered. It may only measue the input at start up rather than dynamically (if at all).

[@edgeeffect]

@@JerryWalker001 does it have any means to tweak the firmware (i.e. a programing header and a source repository)?

[@JerryWalker001]

edgeeffect, There seems to be a programming connector, I will be posting a video of a mini teardown of one of the units in a few days so you will be able to see what is on the boards. I doubt that the firmware is available but it should be relatively easy to write something from scratch. It may be an interesting project.

[@megacharizardx9474]

Can you please do a couple videos with you making/whining Transformers, I would love to learn how to do it

[@JerryWalker001]

Ok I will show the process although I will skip through most of it as it is a very tedious job but I will show the key parts.

[@megacharizardx9474]

@@JerryWalker001 Thank you

[@Triangularification]

Hey Jerry, I found a 60V 400VA transformer at tme for less than 42 pounds, so not hundreds. Shouldn't something like that be fine for a project like this? They have versions capable of handling more power, too. But not higher voltage. I don't have the RD6006 yet (it is on the way), so I can't make measurements, but the transformer is only Ø 137 by 54 mm. Am I way off in thinking it should fit your project? I probably won't be doing this. I just ordered one of those cheap Chinese switch mode supplies. I think exactly the same one you used.

[@JerryWalker001]

If it is a UK (50Hz) core then it may just be enough but 400VA is not really big enough unless you can get the power factor very close to unity which is doubtful for something like this. I did find some 400VA transformers of that size (actually I think they were 58mm tall) but I want to be able to reach the full 360W continuously and I doubt that 400VA would be enough (especially with modern optimistic ratings). Please bear in mind that my videos are not intended as the only solution but are intended to give information about alternatives and simply fitting an off the shelf transformer would not be very interesting. I also found some more expensive 500VA transformers that I considered using but again it would have made a fairly boring video. I think it would certainly be worth trying one of the transformers you have found but my intention for this series is to show how to 'roll your own' :)

[@JerryWalker001]

Just though I sould mention that if you did decide to use one of these transformers then it is probably the 48V unit that you want as they generally specify RMS in which case they would give 67V when rectified but the 60V would give 84V which would trip the over voltage input protection for the RD6006 (It may be worth asking how they specify them but it is usually RMS). Looking at the size I am suspicious of the rating but I may order one just out of interest. However as I mentioned my video series is intended to show how to make one.

[@JerryWalker001]

I thought you may find this of interest. I did a rough calculation based on a 400VA transformer and including 'normal' losses and to get 360W output you would need a power factor of 0.98 (VERY unlikely) even if the 400VA was genuine. The two transorfmers I am using are 280VA each which I am derating to 225VA each so in reality the pair give me an equivalent 560VA. Also I see that TME do not stock the transformers so they may not even exist and by the time you add VAT and shipping then the cost would be much higher but almost certainly there are alternatives.

[@craigmunday3707]

@@JerryWalker001 Hi Jerry, when you say the 48V transformer would give 67V, is this the difference between RMS and peak to peak voltage which you are referring to?

[@JerryWalker001]

When you rectify and smoothe AC you get approx 1.4x the AC RMS voltage so if you take 48V RMS x 1.4 you get 67V.

[@eugenginta753]

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