When fast charging Nickel based battery packs, a charge control is required within the NiMH battery charger to properly charge the batteries. Relative voltage control using the negative delta voltage (–dV) and / or rise in temperature with respect to time (dTdt) principles are proven, reliable charge termination methods.
The -dV termination technique is based on the fact that there is a slight drop in voltage in NiMH / NiCd batteries when they are fully charged, provided they are being charged with DC current. The NiMH battery charger senses the voltage reduction when the battery voltage has reached a certain level in relation to the maximum recorded value and terminates charge.
The dTdt termination technique utilizes the cells’ natural rise in the temperature when nearly full to terminate charge. When charged with sufficient current (usually charge rates of C/2 and higher), the temperature of a NiMH / NiCd cell will increase at a rate of >1°C / minute when it has been charged to its full capacity. As the charger senses this elevated rate of temperature increase, charge will be terminated. Note- the battery pack must include a thermistor to utilize the dTdt termination function.
In the event that neither –dV or dTdt occurs, the charger has a built in safety timer which interrupts the charging after a set period of time and prevents the batteries from overheating.
There is a tendency for the voltage of some batteries to drop during the first stage of the charging cycle. This applies in particular to batteries which have gone for a long time without being charged. Therefore, these chargers have a start timer which prevents premature charge termination during the first few minutes of the charging cycle.
All chargers are equipped with a computer programmable microprocessor, permitting easy configuration by Cell-Con prior to shipment.
- CE, UL, Medically approved models
- 16W, 36W, and 65W versions
- Universal input (90-264VAC / 47-63Hz) for worldwide use
- Desktop and wall plug in versions
- Fast charging cycle
- Multiple charge detection options- -dV, dT/dt, 0dV
- Integral start timer to prevent initial, false –dv detection
- Safety timer backup termination
- 5 versions for packs with 3-20 cells in series
- Protected against reverse polarity and short circuit
- Compact, lightweight design
- Private labeling available
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|Wattage||Charge Rate||Input||Cell Count in Pack||Configuration||Dimensions|
|452115-N||16W||400mA – 1.3A||90-264VAC||2-20||desktop||3.5” x 1.75” x 1.25”|
|452116-N||16W||400mA – 1.3A||90-264VAC||2-20||wall plug in||4” x 1.75” x 1.5”|
|452515-N||32W||900mA – 3A||10-30VDC||2-20||desktop||4.25” x 2.62” x 1.5”|
|452215-N*||35W||900mA – 3A||90-264VAC||3-20||desktop||4.25” x 2.62” x 1.5”|
|452415-N||65W||1.5A – 4.5A||90-264VAC||3-25||desktop||5.25” x 3.12” x 1.75”|