SU1705752A1 - Power tester - Google Patents

Abstract

The invention relates to electrical measurements and can be used in control devices for power supply batteries. The purpose of the invention is to improve the accuracy and efficiency of the control - it is achieved by using a positive feedback resistor 2. The device also contains resistors 1, 5, a LED 3, a complementaryly connected pair of transistors 4, a resistive divider 6, input terminals 7.8. 1 il.

Description

The power control device contains JQ on the resistor 2 applied to the base

There are series-connected resistor 1, positive feedback resistor 2 and LED 3, a complementary pair of 4 transistors

of different types of conductivity, the current-J5 is figuratively until the second transient resistor 5 is saturated, the resistive voltage divider 6, the first 7, and the second V input terminals.

The first output of the voltage divider 6, the emitter of the second transistor and the second output of resistor 1 are connected to the first input terminal 7, and the second output of the voltage divider 5 and the cathode of the LED 3 are connected to the second input terminal 8. The average output of the voltage divider 6 is connected to the first the transistor, the first output of the current-limiting resistor 5 is connected to the second output

the torus of the complementary pair 4, and the positive voltage difference at the base and emitter of the first transistor of the complementary pair 4 holds the light

20 Diode 3 in the on state. In this case, the current through the LED is determined by the total resistance of the resistors 2 and 5.

The presence of an additional chain

25 positive feedback due to the connection of the anode of the LED 3 through a resistor 2 with the base of the first transistor and the current-limiting resistor 5 allows

resistor positive feedback - Q increase resistance value

2 and the base of the first transistor of the complementary pair, and its second output is connected to the collector of the second transistor of the complementary pair of 4 transistors of different conductivity types.

The power control device operates as follows.

The voltage of the monitored power source is applied to the input terminals 7 and 8. If the level of the monitored voltage and the threshold of the device, the first and second transistors of the complementary pair 4

-.h

40

voltage divider 6, which is the main consumer of the current in the device circuits, and thereby increase the nominality of the device and the accuracy of power control.

Claims (1)

Formula invented A power control device that holds a resistive voltage divider, complementarily connected to transistors of different types of conduct, two resistors, an LED whose cat is connected to the second input 50 transistors of different types conducted by the terminal, the first input terminal of the connection will be closed. In this case, the LED 3 is extinguished, since the current detected by the resistor 1 is insufficient for the LED to glow. The positive feedback 2 resistor is low-impedance, so until the device trips, it has almost no effect on the amount of current flowing through the LED and on its stabilizing properties as a reference source at the base of the first transistor. By reducing the voltage of the power source to a threshold voltage "on the emitter of the first transistor 55 with the emitter of the forward transistor, the first output of the prism divider and the first output of the first resistor, the second output of which is connected to the first output of the second resistor, the base of the reverse conduction transistor, the emitter of which is connected to the middle output of the resistive splitter, and the collector is connected the base of the direct conduction transistor, the collector of which is connected to the second output of the second resistor, the second output of the resistive divider is connected to the second input terminal, о t - The first transistor, which further opens it. This process, due to the presence of a positive feedback resistor 2, develops an avalanche the torus of the complementary pair 4, and the positive voltage difference at the base and emitter of the first transistor of the complementary pair 4 holds the light Diode 3 is on. In this case, the current through the LED is determined by the total resistance of the resistors 2 and 5. The presence of an additional chain positive feedback due to the connection of the anode of the LED 3 through a resistor 2 to the base of the first transistor and the current limiting resistor 5 voltage divider 6, which is the main consumer of the current in the device circuit, and thereby increase the efficiency of the device and the accuracy of power control. Invention Formula A power control device containing a resistive voltage divider, a complementaryly connected pair of transistors of different conductivity types, two resistors, an LED whose cathode is connected to a second input terminal, the first input terminal connects with the emitter of the forward transistor, the first output of the prism divider and the first output of the first resistor, the second output of which is connected to the first output of the second resistor, the base of the reverse conduction transistor, the emitter of which is connected to the middle output of the resistive splitter, and the collector is connected the base of the direct conduction transistor, the collector of which is connected to the second output of the second resistor, the second output of the resistive divider is connected to the second input terminal, о t - 51705752 b characterized by the fact that it is connected to the second conclusion of the first a chain of improved accuracy and an economical resistor, and the second output of the third control, additionally introduced the resistor is connected to the anode of the light the third resistor, the first output of which diode.