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G8MNY > TECH 21.02.08 02:01l 53 Lines 2367 Bytes #999 (0) @ WW
BID : 47640_GB7CIP
Read: GUEST
Subj: 1A Float/charging Pb Acid Batt
Path: IZ3LSV<IW2OHX<IQ0LT<SP7MGD<CX2SA<GB7CIP
Sent: 080221/0006Z @:GB7CIP.#32.GBR.EU #:47640 [Caterham] $:47640_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (Updated Oct 05)
(8 Bit Graphics use code page 437 or 850)
Here are 2 simply circuits for small discharge current batteries.
1/ On Insulated Heatsink
in ÚÄÄÄÄÄÄÄ¿out 1N4001
+24V >ÄÄÄÂÄÄÄÄÄÄÄÄÄ´ 7805 ÃÄÄÄÄÂÄÄÄÂÄÄÄÄÂÄÄ´>ÃÄÂÄÄ> +14.5V BOOST
³ ÀÄÄÄÂÄÄÄÙ ³ e\³ 22k ³ +13.5V NORMAL
RAW DC >2200u³+ com_³_ ³ PNPÃÄÄÁÄÄ10kÄÙ
FROM 30V=== /_\` u1³ /³
BRIDGE ³ NORMAL ____³ 9.1V === ³ Battery being
RECTIFIER ³ O _³_ ³ 1k floated/charged
& 17V AC ³ BOOST \o \_/ 0.5V ³ _³_-> Charge
@ 1.5A ³ ³ _³_ ³ \_/-> LED
³ ³ \_/ 0.5V ³ ³
0V >ÄÄÄÁÄÄÄÄÄÄÄÄÁÄÄÄÄÁÄÄÄÄÄÄÄÄÁÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄ> 0V
Voltage set by Zener + Reg - O/P diode loss. 13.5V recommended for floating Gel
& sealed types. 13.8V for wet ones that can be topped up. 14.5V for charging
after discharge, but not left on that voltage.
Current is limited to a peak of 1A. With no I/P smoothing C there will be hum
on the charging current & the battery voltage may not be suitable for floating
with electronic loads. The O/P diode voltage drop lets the PNP light the LED
when the diode has 0.7V across it. The diode also protects the regulator from
reverse voltage is the PSU is off when connected to a live battery.
2/ Add a series R in the common leg. Most makes of regulator put about 50uA
constant current down the common leg, so a small R can uplift the voltage.
On Insulated Heatsink
in ÚÄÄÄÄÄÄÄ¿out 1N4001
+22V >ÄÄÄÂÄÄÄÄÄÄ´ 7812 ÃÄÄÂÄÄÄÄÄÄÄ´>ÃÄÄÄ>
RAW DC ³ ÀÄÄÄÂÄÄÄÙ ³
FROM >2200u³+ com³ u1³
BRIDGE 30V=== Multi 10k === Variable O/P
RECTIFIER ³ Turn ³ ³ Voltage
³ ³ ³
0V >ÄÄÄÁÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄ>
I have used this one for many years to float my paket station on a 5AH gel cell
battery. Via a fused lead it powers a PacCom TNC220, a FT290R(i), & 30W PA,
peak Tx current 8A, Rx 500mA leaving just 500mA to charge for the short packet
Tx time.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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