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Version with 2x 680uF 200V bleed caps

Icewellers's Replication of the Marcus Wagner Charger

Brief Description 

Basically a variant of the MW circuit (V3.51) running at a much lower frequency (under 1 Hz) in "Self Run" mode. The coil output is fed back to the battery. There are 2 variants of this circuit, one with the output connected directly to the positive of the battery, and one to a 1360uF 200V cap

with a 2.5K resistor towards the positive of the battery. The intention is to seek the performance differences between an abrupt pulse leading directly towards the battery Vs a "slow" current fed from the capacitor. This in order to attempt a decoupling of the output loopback and let the battery have the time to "accept" the charge chemically with a lower current. The battery used is a 12V 11Ah Gel lead acid battery taken from an old UPS which failed the "self test" (in other words a high internal resistance due to sulfatation unable to sustain the self test load).

Photos/Video

Circuit representing the bleed current with additional capacitor version

Shunt on below shot is .235Ohms on CH2 and .33Ohms on CH1 carbon film non inductive type while shunt used on right side waveform shots is .33Ohms.

Scopeshot of input (CH1) and output (CH2) currents with 2 different time divisions in direct feedback mode (without bleed capacitor)

Pulse taken through output of coil after diode directly to positive of battery (ignore CH1)

Pulse taken between Collector and Coil

Pulse taken between Emitter and Ground

Negative pulse taken between Battery negative and choke (pulse is reversed to display positive on scope but is infact a negative pulse back to the battery)

Data

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Chronology

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Mar. 11, 2005

• This page created

Replication Particulars

Variant of the MW V3.51 with additional reverse diodes around the inductances and a larger capacitor bank (36.000uF) to sustain the discharge peak better running with a single 12V 11Ah gel lead acid battery. Main instrumentation used for this setup is a dual channel Tektronix TDS220 60MHz scope, a Fluke 8050A lab DMM and a portable UNI-T DMM, 2 analog shunt meters and a digital Metrix AC/DC current clamp for some reading comparisons.

By adding 2 ammeters between the negative of the battery and circuit and the output of the coil output diode and the positive you can monitor what happens to the current. Basically, 2 different behaviours can be seen using the 2 variants. Without the 2 bleed caps and by connecting the output of the coil directly to the positive of the battery, a nice positive pulse can be noted on the output ammeter and a negative pulse will be noticed on the input ammeter. The frequency of operation should not exceed 1Hz or there is not enough recovery time and the input current rises. In this mode, by tuning the BIAS and base pot, I was able to maintain the battery voltage at 12.910 volts for over 6 hours during which period the voltage rose to 12.915Volts and when I got back to it was settled again at 12.910.

Using the above circuit as presented (meaning using the bleed capacitors) the input ammeter will hardly read any current if tuned correctly and the output will read a reduced pulse (analog ammeter indicated 30mA pulse instead of over 100 with the direct loopback) but the caps will accept the pulse and quickly rise in voltage (from battery 12.9V to 16-17 Volts with 1 pulse) and bleed their charge off to the battery through the 2.5K resistor. The tuning is most correct when with a voltmeter in parallel to these caps you let the voltage settle back to near the source battery voltage before another pulse goes off.

See also

related links at PESWiki, as well as off-site links of direct relevance to this page.

• Replications - general index
• Plans
• Data

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