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home | newest check | boards | help index | log | ps | userlogin | send sysop | slog | status forward | bcm news | users | version | remove cookieG8MNY > TECH 22.04.24 07:13l 140 Lines 5670 Bytes #3 (0) @ WW BID : 5937_GB7CIP Read: GUEST Subj: DURITC 1kW 230V Inverter/UPS Path: JH4XSY<N3HYM<K5DAT<GB7CIP Sent: 240421/2209Z @:GB7CIP.#32.GBR.EURO #:5937 [Caterham Surrey GBR] $:5937_GB From: G8MNY@GB7CIP.#32.GBR.EURO To : TECH@WW By G8MNY (Updated Jan 13) (8 Bit ASCII graphics use code page 437 or 850, Terminal Font) Not a UPS really but a high power, stepped square wave mains inverter from 12V. It was blow up when I got hold of it it. I now have it working with new output high voltage MOSFETS. Having made this sort of thing before with heavy conventional transformer etc., I was amassed at this modern HF version, just how small & light weight it is. ________________________ / \ ウ レトトトソ ウ ウ ウ ゙ ウ (0) [=====] [ロ] ウ ウ ウワ ワウ ウ ウ タトトトル ウ トチトトトトトトトトトトトトトトトトトトトトトトトトトトチト DESCRIPTION It has 5 pot core HF pulse width inverters with 2 TIP MOSFETS each handling 200W. The 5 floating secondaries are connected in series to feed a fast high voltage bridge rectifier to a HF choke, into large 400V smoothing cap. レトトトトトトトソ レトトトトトトトトトトトトソ LトエHigh V テトトトトトエ340v HT RECTテトトト<トトトトトトトトトトトトトトトトトトトトトトトトトトトトトトソ Nトエoutputsウ HT ウ & FILTER テトトト<トトトソ レトトソ レトトソ レトトソ レトトソ ウ タトトツトトトトル タトツトトトトトトトトトツル ~ レチトトチソレチトトチソレチトトチソレチトトチソレチトトチソ /ウ\ \ウ/ \ウ/ ウ200Wウウ200Wウウ200Wウウ200Wウウ200Wウ ウdrive Iウmon VウFB ウ INVウウINV ウウINV ウウINV ウウINV ウ レトチトトソ レトトトチトトトトソ レチトトトトトソ タツトトツルタツトトツルタツトトツルタツトトツルタツトトツル ウ50Hzテトト<トトエCONTROL テト>トエHF PWMテト>チトト)トトチトト)トトチトト)トトチトト)トトル ウ ウ Oscウ on ウfan ウ onウ OSC ウdriveウ 30A ウ ウ ウ ウ タトトトトル ウoverloadウ タトトトトトトル |fuses| | | | ウ12 V? テトト<トトトトトトトトトトトトトチトトトトトチトトトトトチトトトトトチトトトトトチ< タトトトトトトトトル 12V @ 125A The pulse width feedback controls that voltage to 340V. This powers 2 high voltage MOSFET amps (blown up) that switch the L & N to +340V for 2/3 for the time giving the 340V peak & 230V RMS 50Hz stepped waveform output. OUTPUT WAVEFORM +340Vエ レトトトソ Fixed Voltage -230Vウ ウ ウ Fixed pulse width ウ ウ ウ 0V エトトル タトトソ レト ウ ウ ウ -230Vウ ウ ウ -340Vエ タトトトル The control for this lot is not simple, there is monitoring of temperature, output current, supply Volts, etc. So working without the diagram is not easy. Still I have it going now, & done some worth while modifications.... PULSE CURRENT If a capacitive load from say a good mains filter is put across the output, then the high voltage Power MOFETs can easily be blown up again, as very high pulse edge currents can flow. 20A エ 1kW Restive ウ 100W load ウ Load ウ\ + 0.1uF 6A エ レトトトソ ウ \_ ウ 0A エトトル タトトソ レト トル ウトトソ _ウト -6A エ タトトトル ウ ウ / ウ ウ/ -20Aエ ウ MODS 1/ Added HT fuse after 340V Cap smoothing! + ツトo-oトトツトトトトトトトトトトソ ウ 3A FET FET L&N 340V === テトL LOAD Nトエ 50Hz ウ FET FET Amps - チトトトトトトチトトトトトトトトトトル 2/ Added a mains IEC in socket small 25W mains transformer & 3 pole changeover relay for bypass (UPS). ___________________________________________ L ウ \_________ ウ _______ レトトトトトソ __ ON ウ L MAINS )||(18V /\ウ レトトチトトソ ウ \_ L INPUT )||(AC Bridge ウRelayウ Start / INVERTER LOAD )||(____ウ_\/ タトトツトトル Upタトトトト N ウ チトトトトトトトトトチ0V ウ _________ N N____ウ______________________________________/ With no smoothing on the relay the relay releases quick on mains fail, changes mains over & the inverter then starts up. 3/ Added standby trickle charging, up to 1A Max @ 13.5V regulated. レトトトトソ 18Vエ>テツトトトトトトツトエ7815テトトエ>テト> +Batt ACエ>テトル 470u===タトトツトル 0V トチトトトトチトトトトトトトト> -Batt 4/ Speeded up the mains fail start up time, but it is too slow for some things. 5/ Added 1uF polly across each HF inverter 12V supply rails. 6/ Added 0.1uF @ 600v across the main HT caps. 7/ Bifilar balanced wound bigger swinging HF choke after bridge rectifier, reduced the QRM. _______ 5x ||(_ /\ 200W _ウ / \ レトトツトトトトトツトトトトト +340V PWM ||(_ /Fast\ oウ ウ ウu1 INVERTERS _ウ /Bridge\____(((((() === === TO ||(_ レRectifier ======= ウ400V ウ L & N _ウ ウ\ / (((((() ウCAP ウ 50Hz AMPS ||(_ ウ \ / ウo ウ ウ ウ _ウ ウ \ / ウ タトトチトトトトトチトトトトト 0V ||(___ウ___\/ ウChoke Starts タトトトトトトトトトトトトルare in phase! 8/ Made balanced L output mains filter (from old HF choke & 2x 6n8 caps to ground). Lトトトソo レトトトトトトトツトトトトト L (((((() === Inverter Inverter ======= Xtype テトE O/P To Output (((((() Caps === Relay Nトトトルo タトトトトトトトチトトトトト N Choke Starts are anti-phase! WARNING Devices that use the reactance of mains caps to drop the mains voltage can be destroyed on this waveform. e.g. a true RMS digital meter! As the pulse edge puts 100x the voltage into the current limiting R or the circuit... Lトエテト100Rトトツトトエ>テトトツト220Rトツトト 100R will catch fire with 340V pulses into C レト)トエ>テトトトエ+ _ウ_ it despite the 1uF looking like 3k3 @ 50Hz! 1uF ウ ウ === /_\`12V I solved this with a 330R 5W in its place! ウ タトエ<テトトトエ100u ウ Nトトトトトトトトチトトトトエ<テトトチトトトトトトチトト Why don't U send an interesting bul? 73 De John, G8MNY @ GB7CIP
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