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G8MNY > TECH 20.11.25 19:18l 140 Lines 5678 Bytes #8 (0) @ WW
BID : 45501_GB7CIP
Subj: DURITC 1kW 230V Inverter/UPS
Path: JH4XSY<N3HYM<K5DAT<VE2PKT<PY2BIL<HB9ON<VK7AX<GB7CIP
Sent: 251120/1014Z @:GB7CIP.#32.GBR.EURO #:45501 [Caterham Surrey GBR]
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, and 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 and 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 and 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 and 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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