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G8MNY > TECH 18.10.25 18:22l 75 Lines 3256 Bytes #3 (0) @ WW
BID : 43092_GB7CIP
Subj: BNOS 12A 13.8V PSU
Path: JH4XSY<N3HYM<VE3CGR<VK2RZ<GB7CIP
Sent: 251018/0919Z @:GB7CIP.#32.GBR.EURO #:43092 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (New Dec 12)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
I have repaired some these, the 12A (15A meter) & 30A model are similar.
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ ﾚﾄﾄﾄﾄﾄｿ ｳ Current limiting
ｳ ｳ\ ｳ ｳ Over voltage Crowbar @ 14.5V
ｳ ｳ \ ｳ ｳ
ｳ ﾀﾄﾄﾄﾄﾄﾙ ｳ
ｳ ｳ
ｳ o o ｳ
ﾀﾂﾂﾄﾄﾄﾄﾄﾄﾂﾂﾄﾙ
INPUT CIRCUIT
The mains transformer's 2 secondaries feed a bridge rectifier & then to the
capacitor bank. (the bridge can fail on heavy use)
__ ___________________
Lﾄo-oﾄﾄo\ﾄｿ||( \__ / ｳ+ ｳ ｳ+ +20V
3A )||(_ / Single === ｳ+ ===
)|| _X Bridge ｳ === ｳ3x
)||( \_Rectifier ｳ ｳ ｳ6m8
Nﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ||(__/ \ \__ｳ___ｳ___ｳ________-Ve (0V)
Eﾄﾄｿ 2x 17V 10A \ \
\ ﾀｴ>ﾃﾄﾂｴ>ﾃﾄ180ﾄﾂﾄﾄﾄﾂﾄﾄﾄﾂﾄ+24V
\AC ｳ ｳ+ _ｳ_ ｳu1
ﾀﾄｴﾃﾄﾙ === /_\'=== ON PCB
+ ｳ ｳ24Vｳ
ﾀﾄﾄﾄﾁﾄﾄﾄﾁﾄ0V
CONTROL CIRCUIT
+20Vﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄｿ
ｳ ｳ/ ｳ ｳ/ ｳ/ 2x
ﾚﾄﾂﾄﾄﾄ)ﾄﾄﾄﾂﾄﾄﾄｴTIP120ｳ ﾚﾄﾄﾄﾅﾄﾄﾄﾂﾄﾄｴ 2N3055
ｳ ｳ ｳ ｳ ｳ\e ｳ/ ｳ ｳ\e ｳ ｳ\e PASS
ｳ ｳ ｳ _ｳ_ ﾀﾄﾄｴ ﾃﾄｴﾃﾄﾄｴ ﾀｴﾃﾄﾄｴTRANSISTORS
ｳ ｳ _ｳ_ \_/ ｳ\e ｳ ｳ R
ｳ ｳ /_\ ｳ Driver ﾀﾄﾄﾄﾄｴ ﾚﾄ1KﾁﾄﾄRﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ(Amp)ﾄﾂﾄ>+13.8V
ｳ ｳ ｳ 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ﾄﾄ2K2ﾄﾄｿ ｳ
ｳ ｳ ﾃﾄﾄﾄ)ﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ)ﾄ)ﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄ)ﾄﾄﾂﾄﾄﾂﾄﾄｴ
ｳ ｳ ｳ ｳ ｳ ｳ ｳ ｳ _ｳ_ _ｳ_ ｳu1ｳ ｳ
+24V ｳ ｳ ｳ ｳ ｳ ﾚSETIﾄﾄ)ﾄﾙ ｳ \_/ =\_/ ｳ === ｳ
ﾃﾄｿ ｳ ｳ ｳ ｳ ｳ ｳ/e ｳ ﾚ5K1ﾄｴ ｳ redｳ ｳ ｳ _ｳ_
2ｳ3ｳ8ｳ1ｳ ｳ ｳ ﾀﾄｴPNP u1ｳ ｳ ﾚﾄﾄﾁﾄﾄﾄｿ8 ﾃﾄﾄﾄﾄﾄﾄｴ 1K ｳ /_\
ﾚﾁﾄﾁﾄﾁﾄﾁｿ 18K ｳ ｳ\ === ﾃﾄｴMC3423ﾃﾄｿ SCR_ｳ_ ｳ ｳ ｳ ｳ
ｳ LM376 ｳ ｳ \ｳ ｳ ｳ ｳ2ﾀﾂﾄﾂﾄﾂﾂﾙ ｳ \_/ _ｳ_ ｳ ｳ ｳ
ﾀﾂﾄﾂﾄﾂﾄﾂﾙ SET NPNﾃﾄﾂ2K2ﾂﾁﾄﾄｿ ｳ ｳ 1ｳ8ｳ4ｳｳ3 ｳ /ｳ =\_/ ｳ ｳ ｳ
4ｳ5ｳ7ｳ6ﾀﾂﾄ>V e/ｳ ｳ ｳ+ ｳ ｳ 1K ﾃﾄﾙ+ﾃﾙ +ﾃ100ｴ ｳ Greenｳ ｳ ｳ ｳ
ｳ===ﾀｴﾃﾙ ｳ ｳ === === 10K ｳ ｳ ｳ === === ===ｳ 2K2 ｳ ｳ ｳ
ｳ ｳu1 2K2 ｳ u1ｳ ｳ10uｳ ｳ ｳ ｳ10uｳ10uｳ u1ｳ ｳ ｳ ｳ ｳ ｳ
ﾄﾄﾁﾄﾁﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾁﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾁﾄﾄﾄﾄﾄﾄﾁﾄﾄﾁﾄﾄﾁﾄﾄﾁﾄ>0V
Volt Control Current Limit Over Voltage Crowbar
VOLTAGE CONTROL
The voltage control IC LM376 runs on a voltage doubled supply of 24V. It
compares it's internal reference with the preset SET V & drives the TIP120
darlington to drive the 2 heat sinked pass transistors to maintain the output
voltage.
CURRENT LIMITING
The 2 pass transistors have current equalising emitter resistors (R), & when
one of these is over the base emitter voltage of the PNP, that turns on a NPN
to override the LM376 drive, to limit the current.
OVER VOLTAGE PROTECTION
IC MC3423 is a triggered over voltage IC that fires the crowbar SCR to short
the output if it is too high. Danger here is when charging batteries if the
trip should go causing a fire. So use a fuse with battery!
Why don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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