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| How to design a 7.5kV AC source? |
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| CristianM:
Hello! I need to design a high voltage AC source with the following specifications: - 7.5kVpp max. output voltage; - adjustable output voltage; - isolated output; - sine wave output; - adjustable output (sine wave) frequency in the range 40Hz-2kHz; - max. 1 mA output current. Can someone recommend a possible solution? A basic transformer or flyback supply (maybe recommend some components, schematics) or even a commercial solution? |
| mikeselectricstuff:
capacitance is going to be an issue at 2Khz, so you may need some care in how the windings are done. |
| CristianM:
--- Quote from: mikeselectricstuff on January 18, 2019, 02:46:06 pm ---capacitance is going to be an issue at 2Khz, so you may need some care in how the windings are done. --- End quote --- Can you detail your answer/provide a design example/guidlines? |
| mikeselectricstuff:
--- Quote from: CristianM on January 18, 2019, 02:49:46 pm --- --- Quote from: mikeselectricstuff on January 18, 2019, 02:46:06 pm ---capacitance is going to be an issue at 2Khz, so you may need some care in how the windings are done. --- End quote --- Can you detail your answer/provide a design example/guidlines? --- End quote --- with 7.5kv bouncing around at 2khz, the capacitive reactance will be significant load. e.g. 10pF at 2KHz has a reactance of around 8M, which will draw a little under 1mA at 7.5kv, so that alone doubles your input power requirement. And the capacitance may be a lot more than 10pf. With the large inductance of the secondary you also need to make sure that you're nowhere near the resonant frequency of the secondary inductance and the stray/load capacitance, or bad things will happen. |
| SiliconWizard:
http://www.trekinc.com/products/PD05034.asp Note: this is costing an arm and a leg. ;D |
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