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Power Supply Series Mode for Split Dual Tracking Use

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mawyatt:
A spin off from here:

https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/msg5669813/#msg5669813

Using a PS with Series Mode (Placing CH1 and CH2 in Series for example) as a Dual Output Tracking Source is an attractive mode, useful for creating dual tacking analog supplies like +-15V for example.

The Instek GPP 4324 performs this task nicely and produces CH1 + to - then CH2 + to - as a Series source with CH1 - directly connected to CH2 + for the common. This creates a CH1 +V and CH2 -V wrt to common connected CH1 - and CH2 +, thus +-V effective Tracking Supply. The GPP 4324 reads the current thru CH1 and CH2 independently and thus you can have different currents from CH1 and CH2 just like two independent supplies.

The Siglent SPD3303X is different. When placed in Series Mode CH1 - to + then CH2 - to + as a Series source with CH1 + directly connected to CH2 - creating a source with CH2 + to Ch1 - with CH2 - directly connected to CH1 + as the common. However the 3303X doesn't read the current from CH2 only CH1 and displays the current for CH1 measured in CH2.

Anyway, would like others to evaluate their supplies that have Series Mode wrt this type behavior.

Best

RoGeorge:
Rigol DP832(A) has 3 channels.
- Ch1 is floating, galvanic isolated from the other two channels
- Ch1 can be used either in series (either with + or with - in series with Ch2) or in parallel with Ch2
- Ch3 and Ch2 have internally wired common GND, but Ch3 can go up to only 5.3V, Ch1 or 2 can go up to 32V each
- Any of the 3 channels can give max 3.2A, analog PS, 1mV, 1mA, SCPI, LXI, etc.
- Ch1 and Ch2 can be put in following mode if needed, over current prot, over voltage prot, etc. (protection values are another setting, distinct from setting the generated V in CV mode, or generated I for CC mode).  OVP and OCP are software driven (they have a small delay, and when triggered, the output channel is turned off).
- Series mode is made by properly connecting the wires (manually) outside of the PS.
- The PS has sense wires (leftover from another model), but they are only used internally, tied inside the PS, no sense wires are available outside of the PS
- Any of the 3 channels can only be used to supply power (they can act as a load).  However, with this trick it can still be used as a controlled load to measure batteries and such:  https://www.eevblog.com/forum/projects/cc-cv-power-supply-as-a-contolled-load-for-batteries-(i-e-rigol-dp832)/

- At best, Ch1 and Ch2 together can do +0...64V/3.2A in series, or +/-0...32V/3.2A in "anti"-series, or +0...32V/6.4A in parallel

thm_w:
It looks like the new SPD4000X has the same behavior as SPD3303X, no plain tracking mode just series/parallel modes only.

Rigol DP932:
- Voltage split across CH1 and CH2, CH1- connected to CH2+ internally, display shows the total voltage (CH1+CH2) and total current (CH1+CH2) only. Set voltage is half of the total voltage (can be a bit confusing).
- Or use tracking mode: mirrors the CH1 settings to CH2 and lets you see everything independently (then add an external jumper).

You can see the UNI-T 3305 behaves similarly here: youtu.be/d056TNS9aa8?t=502
But the display is better, shows very clearly Series on screen.

tautech:

--- Quote from: thm_w on October 08, 2024, 10:18:22 pm ---It looks like the new SPD4000X has the same behavior, no plain tracking mode just series/parallel modes only.

--- End quote ---
Same as what, please quantify ?

thm_w:

--- Quote from: tautech on October 08, 2024, 10:34:43 pm ---
--- Quote from: thm_w on October 08, 2024, 10:18:22 pm ---It looks like the new SPD4000X has the same behavior, no plain tracking mode just series/parallel modes only.

--- End quote ---
Same as what, please quantify ?

--- End quote ---

Same as the supply OP is complaining about, SPD3303X

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