RU1814142C - Charging unit - Google Patents

Abstract

Use: for recharging batteries and restoring electrochemical current sources. SUMMARY OF THE INVENTION: the device comprises a block of damping elements, a rectifier, a zener diode, an indicator, a reference resistor, a load resistor, two transistors, a switching element, a capacitor, a resistor diode. The device maintains a stable charging mode during fluctuations in the supply network and changes in the internal resistance of current sources. 1 ill.

Description

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The invention relates to electrical engineering and is intended for the monitoring of rechargeable batteries and restoration of current sources.

The aim of the invention is to increase the reliability and stabilization of the charge mode.

The drawing shows a structural diagram of the device.

The device contains a block 1 of damping elements, a rectifier 2, a zener diode 3, an indicator 4, a reference resistor 5, a battery b, a load resistor 7, a first transistor 8, a second transistor 9, a switching element 10, a damping capacitor 11, a discharge resistor 12 resistor 13, diode 14.

The ac supply voltage network through the block 1 of the damping elements is connected to the inputs of the rectifier 2, the first output of which is connected to the cathode of the zener diode 3 and the first terminals of the load resistor 7 and indicator 4. The second terminal of the load resistor 7 is connected to the collector of the first transistor Vis base of the second transistor 8 and with the first output of the reference resistor 5. The second output of the indicator 4 is connected to the anode of the diode 14 and the first output of the switching element 10, the second output of which is connected to the collector of the second transistor 9 and to the first the second terminal of the battery 6, the second terminal of which is connected to the cathode of the diode 14. The second output of the rectifier 2 is connected to the anode of the zener diode 3, the emitter of the transistor 8, and the second output of the reference resistor 5.

The purpose of the elements of the device is as follows. The quenching unit 1 is designed to reduce the voltage at the input of rectifier 2 to a desired value. Rectifier 2 provides half-wave rectification

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input voltage. The zener diode 3 provides voltage limiting at the junctions of the transistors 8, 9. The resistor 7 is a load for the transistor 8. The transistors 8, 9 and the reference resistor 5 provide a stable current in the collector circuit of the transistor 9, and the negative feedback is made in the transistor 8. the base of which is connected to the emitter of the regulating transistor 9. The indicator 4 serves to set the required current during the entire battery charging mode and monitor the entire charge cycle. The switching element 10 serves to set the required current at the beginning of the charge cycle. The diode 14 protects the battery 6 from discharging when it is shorted by the switching element 10. Capacitor 11 is the reactance at which the required voltage drop occurs. .

The resistor 12 discharges the capacitor 11 when the device is disconnected from the network. Resistor 13 limits the maximum current.

The execution of the elements of the device is as follows. Semiconductor elements: rectifier 2, zener diode 3, transistors 8, 9, diode 14 are selected based on the extreme operating conditions (see B, I. Galkin, Semiconductor devices, Minsk, Belarus, 1987). Indicator 4, for example, is an arrow type with corresponding measuring limits. The resistors are chosen to the required MLT type dissipation power, and the capacitors, taking into account their breakdown voltage, are MBM type. Switching element 10 is a KM button.

The device operates as follows.

The device is connected to an AC network from the output of rectifier 2, to which a zener diode 3 is connected, pulses with a limited amplitude are received. Before starting work, close the circuit between the indicator 4 and the collector of the transistor 9 by the switching element 10. Through the indicator 4 and further in series, the switching element 10, the collector-emitter junction transistor 9, the reference resistor 5 flows the installation current, optimal for the type of battery. The current is set by changing the value of the resistor 5. The switching element 10 (button) is opened.

The device is ready to go. A rechargeable battery is connected to the terminals in the collector circuit of transistor 9. In this case, an installation current that is optimal for this type of battery flows through the battery 6.

Any change in the magnitude of the load (internal resistance of the battery) does not cause a change in current in the collector circuit of transistor 9, since the regulating

the transistor is surrounded by deep negative feedback.

When charging the battery 6, its internal resistance changes, and any increase (decrease) in the current in the battery

0 leads to an increase (decrease) in the voltage drop across the reference resistor 5, while the collector-emitter resistance of the transistor 8 decreases (increases), and the output current of the regulating

5 of the transistor 9 decreases (increases).

Thus, a change in the internal resistance of the battery during the charging process does not cause a change in the current in the circuit of the indicator 4, through which current monitoring of the battery charge current is carried out. The end of the process is determined by a voltmeter, or the voltage is limited by a zener diode or a stabilizer, according to the principle 5 parallel to the terminals of the batteries 6 (not shown in the drawing).

When adjusting the charge current in the middle or at the end of the cycle to another stable value of the setpoint, it is necessary to close

0 switching element 10 and re-set the reference resistor 5. In this case, the discharge of the battery 6 through the switching element 10 does not occur due to the reverse connection of the diode 14 in the circuit of the battery 6, switching element 10 of the switching 5, diode 14.

The efficiency of the proposed device is expressed in increasing the reliability and maintaining the stability of the current throughout the charging cycle and takes into account the change in the internal resistance of the battery during the charging process, as well as fluctuations in the supply network. The device allows you to automate the entire charging process. So when re-charging silver-zinc elements of type SC-21

Claims (1)

5, the device provides repeatedly restoration of capacity due to the stable charge mode at various initial internal resistances of the battery. The claims 0 Charger containing a block of damping elements connected between the input terminals for connecting the AC voltage network and the inputs of the rectifier, to the outputs of which are connected 5 zener diode, indicator, reference resistor and output terminals for connecting the battery, characterized in that, in order to increase reliability and stabilize the charge mode, a load resistor is introduced into it, the first and a second transistor, a switching element and a diode, the first output of the rectifier connected to the first terminals of the load resistor and indicator, the second terminal of the load resistor connected to the collector of the first transistor and the base of the second transistor, the emitter of the last connected to the base of the first transistor and the first output of the reference resistor, the second conclusion the indicator is connected to the anode of the diode and the first output of the switching element, the second output of which is connected to the collector of the second transistor and the first output terminal, the second output terminal is connected to the cathode of the diode, the second output of the rectifier is connected to the emitter of the first transistor and the second output of the reference resistor.