SU482840A1 - Battery Capacity Monitor - Google Patents

Description

The invention relates to the field of monitoring and measuring the capacity of batteries in their manufacture, storage and operation.

Devices are known that contain a load connected to a battery via a power electronic key, a reference voltage source, a comparison circuit, a multivibrator, a trigger, a reference frequency pulse generator, an additional electrical key, a pulse counter, a decoder, a digital 1 indicator, and measurement control systems.

In the proposed device, in order to simplify and accelerate the measurement process, the cnNpd circuit is connected to the battery, the second to the reference voltage source, and its output is connected to the first input of the drive, the second input of which connects the output of the multivibrator, also connected to the second input the input of the power electronic key, the output of the trigger is connected to the first input of the additional electronic key, the second input of which is connected to the output of the pulse generator of the reference frequency, the output of the additional electronic key p dklyuchep to the input of a pulse counter associated with the output of the digital indicator through deschifrator and its measurement soedipena control system output to the input of the multivibrator.

FIG. 1 shows a block diagram of the proposed device; FIG. 2 - the process of recovering the battery voltage after disconnecting the load for cases of a fully charged battery (curve a) and discharging 50% (curve b), 75% (curve c), 90% (curve g); in fig. 3 is a graphical dependence of the recovery time of the battery voltage after the load is disconnected on the value of the electrical capacity in the battery. When the battery is connected to it, the battery voltage decreases for a certain period of time from the voltage E (battery ac) to and (see Fig. 2), and after disconnecting the load, it is restored to the value E (or another in advance of the specified value of t / i, which lies within the limits: U) over time, which is determined by the capacity present in the battery.

The device contains a load 1 connected to the battery via a power electronic switch 2 controlled by the multivibrator 3; the source of the reference voltage 4 and the circuit of Comparative 5, to one input of which the voltage is supplied from the battery and to the second from the source of the reference voltage; the trigger 6, to one input of which the output of the comparison circuit is connected, and to the other - the output of the multivibrator controlling the power electron 1 1M key; cuejtfiTOp imiulso reference frequency 7 and pulse counter 8 connected via an additional electronic switch 9 controlled by a trigger; a digital indicator 10 connected to the output of the counter via a decoder 11, and a measurement control system 12 connected to the input of the multivibrator on the output.

The device works as follows.

At the time of the change, the system 12 sends a start pulse to the multivibrator 3, which tilts, opens the power electronic switch 2, connects the load 1 to the monitored battery and the time Tm determined by the master circuits of the multivibrator.

The voltage of the battery changes to

and - with. / c a pi 1

where E is the emf batteries; Y, 1 - rated load current; , „- internal resistance of the battery;

and will remain so for the time TM. After a time Tm, the multivibrator 3 returns to its original state.

In this case, the power electronic switch disconnects the load 1 from the battery. The positive (as a result of differentiation) pulse that emerges at the output of the multivibrator 3 sets the trigger 6 to the state in which the electronic key 9 opens and the pulses from the reference frequency generator 7 start input to the pulse counter 8 input.

Starting from the moment of time tz, the voltage at the battery terminals disconnected from the load begins to increase. At the moment when the voltage on the battery becomes equal to the voltage of source 4, the comparison circuit 5 is triggered, and a pulse appears at its output, which sets trigger 6 to the position at which key 9 closes, and the pulses stop flowing to the input of counter 8.

During the time between pulses on the clock input of the counter, the number of pulses comes from the geerator.

N,

Gs

where is tj. - recovery time and battery voltage to the specified value;

That is the period of the following pulses of the reference frequency.

The state of the counter is decrypted by decipher 11, and the digital indicator 10 indicates the resulting number proportional to the battery capacity.

Subject invention

A device for monitoring the capacity of a battery, containing a load connected to the battery via a power electronic switch, a reference voltage source, a comparison circuit, a multivibrator, a trigger, a pulse frequency generator,

Additional electronic key, pulse counter, de-defector and digital indicator and measurement control system, characterized in that, in order to simplify and speed up the measurement process, the comparison circuit with one input is connected to the battery, the second to the voltage source, and its output connected to the first input of the trigger, to the second input of which the output of the multivibrator is connected, also connected

with the second input of the power electronic key, the trigger output is connected to the first input of the additional electronic key, the second input of which is connected to the output of the pulse generator of the reference frequency, the output of the additional electronic key is connected to the input of the pulse counter connected to the digital indicator via a decoder, and the system control the measurement of its output is connected to the input

multivibrator