Patent UA-70359-C2 (UA)
Title: Device for measuring ampere-hour capacity of an electrochemical current source
Inventor: KOSIUK VIKTOR IVANOVYCH
IPC: G01R31/36
Filed: 2001-10-24
Abstract: The present invention relates to a device for measuring ampere-hour capacity of an electrochemical current source according to the equation Q = C x U/(2 x t x k), where Q is the capacity of the current source (A/h), C is the capacity of the measuring capacitor of the device (F), U is the voltage of the current source (V), t is the time interval for charging the measuring capacitor from the current source, and k is the coefficient that characterize design and parameters of the current source. The proposed device for measuring ampere-hour capacity of an electrochemical current source (1) contains a closing switch (2), an opening switch (3), a measuring capacitor (4) with a specified capacity, and additionally, the second closing switch 5, the first peak-to-peak detector (6), the first voltage divider (7) with a division factor of 0.95, the second voltage divider (8) with a division factor of 0.5, a comparator (9), matching amplifiers (10, 11), a triggered sawtooth-voltage generator (12), switch 13, the second peak-to-peak detector (14), a gain-controlled amplifier (15), an analog voltage divider, a switching unit (17), an indicator (18), a unit (19) for generating a signal for discharging the measuring capacitor, switch 20, a switch (21) for discharging the measuring capacitor, capacitor 22, and a resistor (23). The negative terminal of the current source (1) is connected to the common terminal of the device circuit. The inputs of switches 2, 3 are connected to the positive terminal of the current source. The first lead of the measuring capacitor (4) is connected to the common terminal of the device circuit, and the second lead is connected to the output of switch 2. The input switch 5 is connected to the inputs of switches 2, 3. The input of peak-to-peak detector 6 is connected to the output of switch 5. The outputs of the voltage dividers (7, 8) are connected to the output of peak-to-peak detector 6. The inputs of the comparator (9) are accordingly connected to the outputs of switch 2 and voltage divider 7 via the corresponding matching amplifiers (10, 11). The input of the sawtooth-voltage generator (12) is connected to the output of switch 3. The input of switch 13 is connected to the output of the sawtooth-voltage generator (12), and the control input is connected to the output of the comparator (9). The input of peak-to-peak detector 14 is connected to the output of switch 13. The input of amplifier 15 is connected to the output of voltage divider 8. The inputs of the analog voltage divider are accordingly connected to the outputs of peak-to-peak detector 14 and amplifier 15. The first contact of the switching unit (17) is connected to the output of the analog voltage divider (16), the second contact is connected to the output of peak-to-peak detector 6, and the third contact is connected to the input of the indicator (18). The input of the unit (19) for generating a signal for discharging the measuring capacitor is connected to the input of switch 20. The output of switch 20 is connected to the common terminal of the device circuit. The output of the unit (19) for generating a signal for discharging the measuring capacitor is connected to the reset inputs of peak-to-peak detectors 6, 7 and the input of switch 21. The output of switch 21 is connected to the common terminal of the device circuit, and the input is connected to the output of switch 2. The leads of capacitor 22 are accordingly connected the input and output of switch 3. The first lead of the resistor (23) is connected to the output of switch 3, and the second lead is connected to the common terminal of the device circuit.