The analyzer (meter capacity) batteries and accumulators

Introduction:This simple device allows the measurement of battery capacity (mAh, Ah) and consumed energy (Wh). It is suitable for NiCd and NiMH (1-12 cell), lead andgel (VRLA, SLA) batteries into the 12V Li-Ion and Li-Pol (1-4 cell), but also for other types such as LiFePO4, NiZn, alkaline, etc., with a total voltage up to20V. The discharge current can be selected 0.01 - 2.56. Lets eg. Check the wear condition of the battery, charging efficiency methods or detect counterfeitbatteries with which lately have proliferated. It also allows the battery maintenance to the required voltage discharge before recharging them.Description:The base analyzer (meter capacity) batteries and accumulators is microprocessor IO1 - Atmel AVR ATmega8, ATmega8 or ATmega8L. Download theprogram and setting the bits below. The working principle is simple: capacity meter connects charged battery that is discharged with a meter, and thusdetermine its capacity and energy. The discharge current can be digitally selected in the range of 0.01 - 2.56 in increments of 0.01. Discharging is terminatedwhen the end voltage, which is also digitally selectable. IO1 is clocked by an internal RC oscillator 8MHz. Because the accuracy of the measurement dependson the time used timing crystal 32768Hz. Battery voltage (maximum value is 20V) is sensed using a divider R9, R11, P1. Trimmer P1 set so that the valuedisplayed in the current display mode voltage realistic. The battery is discharged through a transistor T1 (IRLB8743). Discharge current is sensed shunt R16(0.24 ohm). Discharge current is controlled by the operational amplifier IO2. The reference voltage is obtained by pulse width modulation (PWM) from theterminal OC1A circuit IO1. The PWM signal passes through the filter and the divider R10, R12, P2, C7 and this produces a DC voltage proportional to thereference current required vybjecmu. Tensions on Gejt T1 is then via IO2 controlled so that the voltage on shunt R16 corresponds to the reference voltage.P3 set in the middle. Select the desired output current of 2.56 and trimmer P2 set to match the actual discharge current match that selected. With P3 resetunbalance (offset) input IO2 (choose current 0.01 A set P3 so that the actual current match). Transistor T1 should be placed on the radiator vyuvanmucorresponding to the maximum power dissipation at discharge (P = U. I). T1 is a logic-mosfet, which opened just 5V. If applied standard type, cantheoretically be powered from a higher voltage IO2 (circuit before 7805). IO3 does not have the cooler, if the input voltage is too high. LED1 indicatesongoing and discharge measurements. Diodes D1 and D2 ensures full T1 closed when discharge is not active. The control buttons are used TL1 TL3 .... Thedisplay used 4-digit LED display. The cathodes of the display are connected to port D, the anode to bits 2-5 of port B. Four display can be assembled e.g.from two two-digit LD-D036UPG-C-D028UR LD-C-D036UR LD-C-LD D056UR -C (types with very high luminosity). Vysocesvtiv display allows you toskip the usual transistors for power amplification. The display is controlled by a multiplex (matrix), frequency division multiplexing is about 100 Hz. R1 to R8determine the current display and the brightness. They are chosen so as to not exceed the maximum output current (40 mA). Battery capacity meter issupplied from a source about 8 - 30V. Sampling is about 15 to 45 mA depending on the number of illuminating segments and values of R1 ... R8 (mostconsumed current falls on the LED display). Capacitors C4 through C6 as close as possible IO1. In series with the battery test, connect the appropriate fuse,otherwise at fault meter capacity (especially fault current control or puncturing T1) or polarity protection in case of fire!Control:The battery meter is operated with buttons Mode, + and -. Button Mode gradually switches 6 screens: 1) Display current voltage (0,00V - 20,4V). 2) The measured energy in Wh (Watt hour). Show "En" and then the value. During discharge accrues, after the measurement here is the resulting value. 3) Measured capacity in Ah (ampere hours). Displays the "Ah" and then the value. During discharge accrues, after the measurement here is the resultingvalue. 4) Measured discharge time in hours (0.00h - 655h). 5) Selected discharge current. Use the + and - can be selected from 0.01 to 2.56. 6) The terminal voltage. Use the + and - can be selected voltage at which the discharge is a measurement is completed, ranging 0,80V - 20.0 V.Press "-" may be in steps 2, 3 and 4 to zero energy, capacity and time (only works if it is not active and discharge measurements). Long press the pause modeon or discharging a measurement. Ongoing discharging a measurement is indicated by LED1. After LED1 is extinguished and the measured data can be read(energy, capacity, time). Before a new measurement data reset (the data at the beginning of the measurement does not reset itself to allow, if necessary tocontinue the interrupted measurement). The terminal voltage is usually chosen about 0.9 - 1V for NiCd and NiMH, 3 - 3,4V for Li-ion and Li-pol, 9-10V forlead acid batteries.

The entire program downloads:source code in assembler (ASM)translated in the HEX file (2150 Bytes)Writing in the AVR program is focused on evaluation here .

Potential candidates can send programmed microprocessor. More info here .

Schema Analyzer (meter capacity) batteries and accumulators.

Setting configuration bits (in PonyProg).

First tests of battery capacity meter.

Incorporation meter capacity batteries and accumulators in the box.

Ready meter capacity batteries (batteries) 4 NiMH tests.

Analyzing two NiCd cells.

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Video - Performing meter capacity batteries.

Added: 28. 4. 2014Back to homepage