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　　Circuit for Eliminating the Memory Effect of NiCd Batteries

　　China Battery Network If the nickel-cadmium battery is not fully discharged during use, it will produce a memory effect, that is, charge it once. The power will be reduced once until it can no longer be used. To eliminate this memory effect, the circuit provided in this article can be used to fully discharge the battery. Although with a simple nickel-cadmium battery, if it is not completely discharged during use, it will produce a memory effect, that is, charge it once. The power will be reduced once until it can no longer be used. To eliminate this memory effect, the circuit provided in this article can be used to fully discharge the battery. Although a simple

　　If the nickel-cadmium battery is not completely discharged during use, it will produce a memory effect, that is, charge it once. The power will be reduced once until it can no longer be used. To eliminate this memory effect, the circuit provided in this article can be used to fully discharge the battery. Although a simple resistor can fully discharge the battery, if no special measures are taken, the battery runs the risk of overdischarging, in which case the polarity of the battery is reversed. The simple circuit designed here can make the discharge drop to about 600mV. This ensures correct discharge of the battery without the risk of polarity reversal. This discharge current does not use a constant current discharge to allow the battery to recover during the circuit interval. Extend its service life. As shown in Figure 1. This is a simple flyback intermittent oscillator circuit. The oscillation frequency is in the kHz range, depending on the winding method of the transformer X1 coil. The primary of X1 uses No. 36 enameled wire to wind 30 turns on the I-shaped magnetic core skeleton, and the secondary uses the same number of enameled wire to wind 15 turns. Figure 2 is a detail of the size of the bobbin.

　　Working process: After the circuit is powered on, the battery passes through R1 and the lower winding of the transformer X1 to energize the base-emitter of T1. Transistor T1 is quickly turned on due to positive feedback from the X1 winding. LED1 does not emit light during the conduction period. After T1 is turned on, it tends to a steady state. At this time, the AC impedance of the two windings of X1 disappears, and the DC resistance is almost zero. At this time, the collector-emitter voltage is almost 0, and the base voltage is 0.6V lower than the T1 conduction threshold voltage. Then T1 ends. After the cut-off, LED1 turns on and emits light due to the energy storage in the X1 winding. During the LED1 light emitting period, the X1 winding has current flow again. After the circulation, T1 is turned on again due to the positive feedback of X1, so that intermittent oscillation occurs repeatedly. During oscillation, when T1 is turned on, X1 accumulates electric energy, and LED1 does not emit light. When T1 cuts off, the energy storage discharges to make LED1 glow, and the nickel-cadmium battery can be discharged, and the battery voltage gradually decreases as the discharge progresses. When the battery voltage is discharged to 0.6V. LED1 will no longer emit light, and the battery discharge process is over. If you want to speed up the discharge process of the battery, you can use multiple LEDs in parallel with LED1 to increase the load. If there is still doubt about the memory effect of the battery after discharge. The battery can be continuously charged and discharged several times to see if there is still memory effect. After this discharge treatment, the nickel-cadmium battery can restore its original capacity.