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Primary switched chargers (HF-chargers)

Datum: 28-04-09

BY: BJÍRN MENTZER

Problems using maintenance free lead acid batteries are very well known by the user of battery technology. Maintenance free lead acid batteries very often have to be replaced after a short time of usage with a low capacity and long time before the estimated time of usage has been reached.



Compare charge profile of a thyristor charger and a primary switched (HF) charger type G1-300

Problems using maintenance free lead acid batteries are very well known by the user of battery technology. Maintenance free lead acid batteries very often have to be replaced after a short time of usage with a low capacity and long time before the estimated time of usage has been reached.
Possible cause for typical cyclic application like wheelchair and golf-caddy is a heavy deep discharge and a wrong charging, a not fully charge or a overcharge of the battery.
• Wrong charging and Overcharging lead to a irreversible loss of electrolyte in the battery.
• Continuos deep discharging will cause sulfatation of the battery.
• Not enough charge will cause an earlier discharge in the next cycle.
In any way a reduced time of usage will be the result, because the chemical destructive process can not be consumed like it is possible with a “wet battery“, where distilled water can be filled in the battery a destructive chemical process is irreversible in a maintenance free lead acid battery.

Modern Battery-Technology requires modern Charge-Technology.

The named problems, except the continuing deep discharges, are caused by a wrong charging regime and by chargers that are not suitable for maintenance free lead acid batteries
Usually a high ripple of these chargers causes a excessive heating of the battery and therefore a shortage of lifetime.
Modern chargers, e.g. primary switched, or so called High-Frequency chargers, like our product series G0-300, G1-300, G2-300, have a low ripple (< 2%) avoid a damage of the battery and guarantee a maximum time of usage of the battery.
REDUCTION OF CHARGE TIME
Using primary switched charge technology with a low ripple, and a high efficiency a reduction of charge time can be reached. Comparing a thyristor charger with this chargers, the charge time will be 25% faster. This also means, that a 25% smaller charger can be used to reach the same charge time. The price of the charger generally increases by the size.
PERMISSION OF USAGE

The chargers of the series G0-300: 12V 2A, 24V 1A, G1-300: 12V 4A, 12V 5A, 24V 2,5A, and G2-300 and G22-300: 12V 7A to 24V 10A, have received a permission of usage by named battery manufactures.
Advantages of modern primary switched charge technology
Reduction of energy cost of up to 33% (Comparison of a charger type G1-300, 12V 4A, with a thyristor charger 12V 4A, reduction approx. 10,00 DM/year)

Reduction of charge time of up to 25%, or usage of a charger with less power (Comparison of a charger type G1-300, 12V 4A, with a thyristor charger 12V 4A, reduction of charge time of approx. 25%)
Small size, weight
Avoidance of excessive heating due to a low ripple (< 2%)
Compliant to EN 61000-3-2, harmonic distorsion, required from year 2001 for all chargers with an input power of 75 Watt
Precisely adjustable and freely programmable charge profiles
Quarantee of the maximum time of usage of the batteries

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