SU1443058A1 - Device for cell-wise monitoring of storage battery voltage - Google Patents

Abstract

The invention relates to electrical engineering and can be used in uninterruptible power systems. The aim of the invention is to simplify the circuit and increase reliability. The device contains a switch 3 on one multiplexer 2, an oscillator 5, a counter 4, a differential amplifier 6, a reference voltage source 11, a comparison circuit 10, an analog memory 7 and a trigger 12. The circuitry of the device ensures sufficient reliability of its operation. 1 il.

Description

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The invention relates to electrical engineering and can be used in uninterruptible power supply systems for continuous element-by-element coyrol battery state.

The aim of the invention is to simplify the design of the device and improve reliability.

The drawing shows a block diagram of the proposed device.

The device contains an ac tor battery 1, consisting of galvanically connected batteries 1, Ij ,, connected to the analog inputs n + 1 of the channel multiplexer 2 of switch 3, the control inputs of which are connected to the outputs of the counter 4, whose input is connected with a clock 5. Analog output multiplexer 2 is connected to the inverting input of the differential amplifier 6 and with an analog memory 7. The latter consists of a resistor 8 and a capacitor 9. The common point of the KS circuit 8.9 is connected to the non-inverting differential input ntsialnogo amplifier 6, whose output is connected to one of rows WMOs comparing circuit 10, to the second input of which is connected a source 11 output the reference voltage. The output of the comparison circuit 10 is connected to the information input of the trigger 12, the strobing input of which is connected to the output of the clock generator 5, the setup input to the reset input of the counter 4, and the output connected to the blocking input of the clock generator.

The device works as follows.

When the pulses of the clock generator 5 are applied to the counter 4, a digital code appears at the output of the latter, in accordance with which the multi-plexer 2 connects the outputs of the batteries to the non-inverting input of the differential amplifier 6 O ... P.

Let, at the initial moment of time, a code i is supplied to the control inputs of the switch 3, and a voltage U is applied to the input of the analog memory 7; with i-ro switch turn. Then if you fulfill the conditions

t i: "T

(one)

Where

R8 C9;

T - the period of the pulses of the clock generator 5;

t is the pulse duration of the clock generator,

the voltage U will be set at the end of the i-th interval on the codensor 9. On the front (1 + 1) -th. the pulse of the clock generator 5, the output code of the counter 4 is increased by 1 and the switch 3 goes into the (i + 1) -e state. After the time t has elapsed, taking into account the condition (1), the voltage U; is established at the inverting input of the differential amplifier 6, and the voltage U, will remain at the capacitor 9. The output voltage from the differential amplifier 6

Ud k (U -, - Ut)

k-u

(2)

5 0 5

0

five

five

where k is a constant coefficient; and; - voltage of the ith multiplier

is fed to the input of reference circuit 10. The result of the comparison of the voltages U f and the reference voltage U from the source 11 is recorded in the D-flip-flop 12 by the decay of the (i + 1) -ro clock pulse. By the time of the arrival of the (H + 2) th clock pulse, the capacitor 9 is charged to voltage U ,,, after which the voltage of the next battery is monitored, etc.

At the end of the monitoring cycle, the counter is reset, 4 from the (n + 1) -th state to zero. The reset pulse affects the setup input of the trigger 12, blocking the recording of information from the comparison circuit.

In this case, when the voltage Ui of the controlled battery is below normal, the signal from the output of the trigger

12 the clock generator 5 is locked, and the external devices are channelized

13cw is informed about the presence of the defective item and its number.

Claims (1)

Invention Formula An element-by-element battery voltage monitor containing a switch, a clock generator with a block; 1 input, the counter whose output is connected to the switch, and the input to the output of the clock generator, the differential amplifier, the source of the reference voltage.  . 1443058 comparison circuit, the inputs of which is a foreign memory, the output of which with the outputs of the reference source on-connected to non-inverting input pitch and differential amplifier-differential amplifier output l, characterized in that, the comparison circuits are connected to the information, in order to simplify the device and, to the input of the newly introduced triggered reliability, the switch is outdated, the gate of which is filled with one analog multinuclear to the speed of the clock generator, plexer, the inputs of which are connected to the setup input - to the reset input to the terminals of the battery batteries, and the Q counter, the trigger output is connected to the output is connected to the inverting input-blocking input of the clock generator of the differential amplifier and input. do additionally introduced analog