SU1539895A1 - Device for automatic disconnection of storage battery during charging - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used to automatically stop the charge of a battery and disconnect it from a pulsating source of charging current upon reaching a predetermined state of charge. It allows you to increase battery life due to the fullness of its charge. When the threshold device 5, which controls the charging voltage at the device output terminals 2, is triggered, the delay node 6 generates a signal for switching off the switching unit 3 if the delay reset node 7 confirms the timeliness of the operation moment. In this case, the battery 9 is disconnected from the input terminals 1 and, as a result, from the charging source. The device is restarted using button 4. 3 Il.

Description

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The invention relates to the field of electrical engineering, can be used to automatically determine the end of the battery charge and disconnect it from the source of pulsating current when the charged state of the car battery is reached.

The aim of the invention is to increase the battery life by increasing the completeness of its charge.

FIG. 1 is a block diagram of a device for automatically disconnecting a battery; in fig. 2 shows time diagrams of voltages at the output terminals (Fig. 2cO, at the output of the threshold device (Fig. 25), at the output of the delay circuit (Fig. 2c); Fig. 3 is an embodiment of the device circuit.

The automatic battery disconnecting device contains input 1 and output 2 terminals connected via switching unit 3 equipped with a start button 4. Input of threshold device 5 is connected to output terminals 2. Output of delay unit 6 is connected to control input of unit 3 commutation. The input of the reset delay node 7 is connected to the output of the threshold device 5, and the output is connected with the delay node 6. A charged pulsed current source 8 is connected to the input terminals, and a chargeable battery 9 is connected to the output terminals.

The device works as follows.

When you press the start button 4

input terminals 1 are connected with

corresponding output terminals 2 and pulsating charging current flows through the battery 9. If the battery voltage (see Fig. 2a, curve A, the interval t0-t.,) Is below the level and „0p, corresponding to the triggering of the threshold device 5 (Fig. 2a, right B), i.e. below the full charge voltage, a certain (for example, high) level of the bridge is set at the output of the threshold device (Fig.2.5 interval). The delay reset unit 7 in this case fixes the delay unit 6 in the off state and a definite is formed at the output (for example, the voltage level is low (Fig. 2, the interval t0 is t,). The shutdown unit does not operate and the battery 9 stops

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connected to the current source 8 after releasing the starting button 4. During charging of the battery 9, its voltage gradually increases and at some time tt the voltage at the output terminals begins to exceed the threshold, and first in the phase of large values of the pulsating charging current ( figure 2, the interval t1 - t2). How. as indicated above, the pulsating voltage component (FIG. 2a, curve A) is caused by the flow of charge current through the transition resistance of the terminals 2 and the internal resistance of the battery 9. The threshold device 5 starts to operate in each period of change of the charging current, producing negative pulses with a duty cycle gradually decreasing as the battery voltage rises (Fig. 2 S, interval t1 - t,). Each time threshold device 5 is switched to a low output state, delay delay circuit 7 stops blocking delay node 6 and the latter starts. However, until time t, when the battery voltage exceeds the threshold level, the reset node 7, controlled by the threshold device 5, resets the delay before its time exceeds the duration of the pulsation period of the charging current.

After the battery voltage reaches the value corresponding to the full charge (Fig. 2a, time point t3), the threshold, the device 5 stops switching and forms

output constant low

t.

Voltages (Fig. 25 from t3 onwards). After a time delay at time t 4, the delay node generates a high voltage level at the output (FIG. 2, Lo t, t and later) arriving at the control input of the switching unit 3 and causing it to trip. The battery 9 is disconnected from the source 8 of the charging current and the charge ceases. Re-activation is possible only after pressing the start button 4.

A device for automatically disconnecting batteries can be configured, for example, as shown in FIG. 3. The terminals XT1 and XT2 are input, they are connected to the source of pulsating charging current A1. Terminals HTZ and HT4 - weekend, to them

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GB1 battery is connected. The threshold discharges the capacitor C1, carried out

The device is made on an operational amplifier DA1, one of the inputs of which is connected to a voltage source made on the Zener diode VD.1. The delay node contains a charging circuit P6, C1 and a threshold element - a Zener diode VD3. The capacitor C1 is charged from the power source - | 0 through the resistor RB until the voltage across the Zener diode VD3 is exceeded, after which the switching unit, executed on the VD4 thyristor, resistor

reset delay

i

The use of the device according to the invention makes it possible to improve the conditions of operation and the periodic charge of the batteries and prolong its service life.

Claims (1)

Invention Formula The device automatically disconnects the battery at charge, contents - l.d, l. J - J L. f P -J ti. V- H- (C t R8, electromagnetic relays: intermediate- 5 connected via a switching unit Mr. K2 and Power Kt. When the VD4 thyristor is turned on, the winding of the relay K2 closes, it releases and. contacts K2.1 breaks the power supply circuit of the entire device, including the winding of the blue relay K1, which disconnects the battery GBt from the charging current source A1. The delay reset node is made on the transistor switch VT1. The base of the transistor is connected to the output of the operational amplifier DA1 through the resistor R4 and the zener diode VD2., With a high voltage level at the output DA1. Zener diode VD2 pierces, transistor VT.1 enters saturation mode and fast ™ C input terminals for connecting a charging source and output terminals for connecting a charged battery, a threshold device connected to the output terminals, and a delay node whose output is connected to the control input of the switching unit is different from that that, in order to increase the completeness of charge and battery life, a delay reset node is included in it, which is connected between the threshold device and the delay node, while the delay time exceeds the duration of the charge current ripple. reset delay i The use of the device according to the invention makes it possible to improve the conditions of operation and the periodic charge of the batteries and prolong its service life. Invention Formula The device automatically disconnects the battery at charge, contents - l.d, l. J - J L. f P -J ti. V- H- (C t  connected via switching unit input terminals for connecting a charging source and output terminals for connecting a charged battery, a threshold device connected to the output terminals, and a delay node whose output is connected to the control input of the switching unit is different from that that, in order to increase the completeness of charge and battery life, a delay reset node is included in it, which is connected between the threshold device and the delay node, while the delay time exceeds the duration of the charge current ripple. FIG. 2 kg.1 FIG. 3