Engineering Evaluation Tests of 20-Ampere Airborne Battery Charger (Breadboard) Manufactured by Sundstrand Corporation,
NAVAL WEAPONS SUPPORT CENTER CRANE IND WEAPONS QUALITY ENGINEERING CENTER
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A proposed military specification for aircraft Ni-Cd battery chargers. Cyclic testing, was performed on a Vapor airborne battery charger manufactured for DC-9 aircraft, PN 26340061-04 loaned to the Navy for evaluation. The results of this evaluation are reported herein. Following the evaluation of the Vapor charger, a contract was awarded to Vapor Corporation to build one breadboard and three militarized 20-ampere airborne battery chargers. Investigation of nickel-cadmium battery charge techniques with the use of the breadboard charger was conducted. The purpose of this investigation was to define a suitable charge technique for incorporation in three airborne battery chargers to be built to requirements and delivered under contract. The results of this investigation are reported herein. Based upon the results of this evaluation, and other tests which were conducted during the preparation of reference a, the chargers to be manufactured by Sundstrand Corporation shall 1 Conform to MIL-C-85050 airborne charger specification. 2 Charge the battery at 1.0A until the battery reaches 16 or - 1.0V. 3 Pulse charge the battery main mode at an average current of 24 A within the average output power envelope shown in Figure 1, consisting of positive and negative pulses. 4 Pulse charge the battery topping mode at a constant average current of 5 A consisting of a positive and a negative pulse. The positive pulse shall have a duty cycle of 20 and an amplitude necessary to achieve 5 A average, but not to exceed 35 A.
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