SU1372428A1 - Apparatus for limiting discharge of storage batteries - Google Patents

Description

(21) 4031522 / 24-07

(22) 03/03/86

(46) 07.02.88. Bul № 5

(71) Siberian Metallurgical Institute. Sergo Ordzhonikidze

(72) L.V. Kozelkov, E.V. Pugachev, B.Ya.Rosenstock and G.I. Sivchikov (53) 621.355.1 (088.8)

(56) USSR Copyright Certificate No. 978237, cl. H 01 M 10/48, 1981.

Electronics 1968, No. 7, p. ten.

USSR Author's Certificate No. 1332418, cl. H 01 M 10 / 48.02.01.86.

Author's certificate of the USSR No. 1026201, cl. H 01 M 10/48, 1982.

(54) DEVICE FOR RESTRICTING DISCHARGE OF BATTERY BATTERIES (57) The invention relates to electrical engineering and is intended to limit the discharge of a battery (AB) during its testing or operation. The purpose of the invention is to increase the efficiency of the device. The device contains three transistors (T), six resistors, a diode and a capacitor. When the load is disconnected, the starting T 14 is closed first, and then the controlling T 7 and the regulating T 1. The efficiency of the device is improved by reducing the active losses in the regulating T at high discharge currents and improving the shutdown clarity. 1 il.

(L

vj

Yu

four

t

f

The invention relates to electrical engineering and can be used, in particular, at training stations when discharging batteries from sealed batteries of mine headlamps.

The purpose of the invention is to increase the efficiency of the device.

The drawing shows a diagram of the proposed device.

The device contains an output transistor 1 connected by a collector to the first output of load 2, and an emitter through switch 3 to the first output of the battery 4, the first resistor 5 shunting the base and emitter of transistor 1, the second resistor 6 regulating the transistor 7 connected by the emitter to the second pole of the battery 4 and the second output of the load 2, and the collector through a resistor 6 to the base of transistor 1, a variable resistor 8, shunt the base and emitter of the transistor 7, the third 9, the fourth 10 and the fifth 11 resistors, a capacitor 12, a diode 13, the third trans A source 14 whose collector is connected via a resistor 9 to the base of transistor 7, and through a capacitor 12 to the first pole of battery 4, the base of transistor 14 is connected via resistors 10 and 11 respectively to the base and collector of transistor 7, and the emitter is connected to diode 13 transistor emitter 1.

The device works as follows.

The opening potential of the transistor 14 comes from a divider, one shoulder of which contains a resistor 10 and a resistor 8, shunting the baso-emitter junction of transistor 7. The second shoulder contains resistors 11, 6 and 5, the latter shunting the baso-emitter junction of transistor 1. Resistor values 10 and 11 are selected in such a way that if the transistor 7 is closed, the voltage applied to the base of the transistor 14 will not be enough to open it even when the battery is fully charged and the voltage on it is maximum.

The device is started up by connecting battery 4 to it using switch 3 due to current flowing through the base-emitter junction of transistor 7 when charging capacitor 12. Resistors 6 and 9 are selected so that transistors 1 and 7 are in saturation when the voltage changes battery 4 from the maximum to the set value at which the load current is interrupted. A trip occurs when the base current of the transistor 14 is insufficient to fully open.

this transistor, and it will start to close, the output of the saturation transistor 7. As soon as transistor 7 comes out of saturation, all transistors will avalanche close. The degree of saturation of the transistor 7 is set by means of a variable resistor B. In this case, within certain limits, the setting of the voltage level setting at which the device turns off occurs.

The setting of the voltage level at which the device shuts down is almost unchanged when the load current varies within permissible limits, for example 0.5-2.5 A for batteries from NKGK-11D.1 batteries. reducing the voltage on battery 4 first starts

the third transistor 14, then the regulating transistor 7 is transferred from the saturated state to the active mode, and the active mode of the transistor 1 is practically excluded due to its fast switching from the saturated state to the closed state.

The proposed device is reliable in operation, provides with sufficient accuracy load shedding in a wide range of current variation, has a relatively low cost and is not critical to the variation of the parameters of circuit elements.

Claims (1)

Invention Formula A device for limiting the discharge of batteries containing an output transistor included. according to the scheme with a common emitter between the first terminals for connecting the battery and the load, the first resistor shunting the base-emitter junction of the output transistor, the regulating transistor connected by the emitter to the second terminals for connecting the battery and the load, and the collector through the second resistor to base of the output transistor, the third transistor connected by the emitter through a directly connected diode to the first terminal for connecting the battery, the collector through the third resistor to the base the base transistor, and the base to one output of the fourth resistor and through the fifth resistor to the collector of the control transistor, characterized in that. that, in order to increase the efficiency of the device, a capacitor and a variable resistor were added to it, shunting the base-emitter junction of the regulating transistor, while the second terminal of the fourth resistor was connected to the regulating transistor base, and the capacitor was connected between the collector of the third transistor and the first terminal to connect the battery.