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On Aug 28, 8:39*pm, wrote:
On Aug 28, 4:02*pm, wrote: On Aug 27, 12:40*pm, raypsi wrote: finally came across an article by VK3HZ that describes how to make a microwave oven inverter PS work, as a stand alone supply. the link is:www.users.bigpond.net.au/dwsmith/hv_inverter.pdf It's only regulated from the primary side. And you can make it put out anything from 2000 to 4000 VDC. but at 1300 watts. So all I have to do is load down the primary to fake out the regulator into seeing 1300 watts, Or run class A. The output or the input still has to be filtered There's an opto coupler that has to see a 110hz square wave, according to VK3HZ, that'll keep the supply running full tilt as long as there is power supplied to the inverter. 73 n8zu If the circuit can be driven from 555 osc perhaps the pulse width can be controlled from a feedback voltage taken off the output of the power supply. I am thinking adding a small winding to the transformer rectifying and filtering it and supplying this back to control the pulse width of your osc. JImmie- Hide quoted text - - Show quoted text - I was the OP of the origonal thread about the inverter power supplies. I was actually more interested in learning about the design of the power supplies so I could possibly build one from scratch. With the right information this may be easier to do than to modify one from a microwave oven. I am very grateful for the information. I have a couple of the Panasonic power supplies unfortunately they dont work but maybe I can repair them now that I have a schematic. Information on the transformer would be a good thing to have as I am sure it could be optimized for the desired output voltage and current needed for an amateur amplifier. With the current transformer on the front end I am guessing this may be the feedback path for regulation. That is to say the power supply is being controlled by the amount of current that is being drawn on the input side of the power supply. If this is the case maybe this input can be taken of the out put of the power supply and then the supply could be voltage regulated instead of being power regulated. Jimmie- Hide quoted text - - Show quoted text - Hey Jimmie I suppose that you could use the duty cycle feature of this supply to control the output but I'd need a bank of 450WVDC caps to supply filtering. So say the power of the amp drops: the supply will compensate by increasing the voltage But with feedback I could drop the duty cycle thru the opto coupled input. Thus causing a drop in voltage which the filter would handle. By running the inverter at another lower duty cycle I can control the output voltage. I would suggest at least a bank of 16, 450WVDC for a little head room. Plus that would take out the 120 cycle ripple. 73 n8zu |
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