|Class D Switching Power Amplifiers and Power D/A conversion|
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|22nd August 2019, 06:21 AM||#1|
Join Date: Jan 2003
Location: Dortmund, Germany
Hypex UcD700HG with non-hypex SMPS, driver supply
Since the IRS2092 based sub amp in my 6-channel DIY amp broke down (powered by a 1450 W +-75 V SMPS), and all the other five channels are already powered by Hypex UcD400OEM modules (with two additional SMPS for those modules), I am thinking about using a UcD700HG HxR module (on sale right now by hypex) instead of a IRS2092 based solution.
The UcD700HG need a +-75 V main supply, and an additional +15 V referenced to the negative main supply for the driver bootstrap.
I asked hypex if I could use my existing SMPS (which supplies +-75V, +-15V with shared ground to the main supply, and independent GND / + 12 V).
Tech support said that I would have to use an additional supply. I have a Meanwell RS-15-15 lying around. I asked the tech support if the following wiring would be correct, to which he simply said "yes, that is correct":
+75V -> Vcc
GND -> GND
-75V -> Vee
2. SMPS (+ 15 V / GND, for example Meanwell RS-15-15)
+ 15 V -> Vdr
GND -> Vee
But then I have to different supplies connected together, the GND of the meanwell connected to the negative rail of the big SMPS. I kind of trust the tech support of hypex, but will this really work???
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|22nd August 2019, 06:39 AM||#2|
Join Date: Oct 2013
I cannot reason why it should not work, though I am no expert.
Except for a capacitor, the Meanwell RS-15-15 does not have a connection between GND and safety earth, so there is no problem that it shorts -75 V rail.
The +15 V power supply must source current, which is OK for the Meanwell RS-15-15 as well.
http://www.europe-audio.com/datashee...5CUcD700HG.pdf (page 9 shows a power supply for which the +15 V is generated by a 7815, which can only source current)
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