SU1675792A1 - Device for testing of voltage - Google Patents

Abstract

The invention relates to electrical measuring technique, in particular to devices for monitoring and signaling voltage. The purpose of the invention is to reduce the power consumption. To do this, a device for controlling the battery voltage, containing a single junction transistor 10, a capacitor 8, a resistor 6, is used to introduce a transistor 5 p - n - p-type, a resistor divider 4, a separator capacitor 9, resistor 7, diode 3. 1 Il.

Description

The invention relates to electrical engineering, in particular to devices for monitoring and signaling voltage, and can be used mainly in portable sound-producing equipment for monitoring the voltage of galvanic cells.

The purpose of the invention is the reduction of power consumption in both standby and signaling states,

The drawing shows a circuit diagram of a device.

The voltage monitoring device comprises input terminals 1 and 2, respectively, a diode 3 and a resistive voltage divider 4 connected in series, a p-transistor 5 - η - p-type transistor 5, first 6 and second 7 resistors, a capacitor 8, an isolation capacitor 9, a single-junction transistor 10, and output terminal 11.

The anode of the diode 3, the first output of the first resistor 6 and the first output of the second resistor 7 are connected to the input terminal 1, and the first output of the voltage divider 4, the collector p - η of the p-transistor 5, the first output of the capacitor 8 and the first base of the single junction are connected to the input terminal 2 transistor 10. The emitter of the p - η - p transistor 5 is connected to the second output of the first resistor 6, the second output of the capacitor 8 and the emitter of a single junction transistor 10, the second base of which is connected to the second output of the second resistor 7 and to the first output of the isolation capacitor 9, soy Inonii second terminal with the output terminal 11, while the base p - η - p-transistor 5 is connected to the intermediate tap of the voltage divider.

A device for monitoring voltage operates as follows.

The voltage of the controlled power source is supplied to the input terminals 1 and 2. In the event that the level of the controlled voltage is higher than the threshold, the device is in standby state: p - l - p-transistor 5 is active! mode, i.e. It is an unsaturated key and together with a resistor! 6 and a capacitor 8 forms an adjustable voltage divider that sets the emitter potential of the transistor at a nominal input voltage less; the threshold voltage for switching on the single-junction transistor 10, as a result of which the voltage at the emitter of the single-junction transistor 10 relative to the first base is not enough to open it. When the level of the controlled voltage decreases, the current in the emitter-collector circuit p - η of the p-transistor 5 decreases, which leads to an increase in the potential of the second output of the capacitor 8 relative to the input terminal 2. When the voltage between the emitter and the first base of the single-junction transistor 10 reaches a threshold value, the latter opens, the current in the circuit of the first resistor 6 - emitter - the first base of the single-junction transistor 10 increases sharply, the emitter junction p - η - p-transistor 5 is shifted in the opposite direction by a voltage drop across resistor 6, as a result of which p - η the p-transistor 5 jumps shut. At the same time, the capacitor 8 is discharged along the emitter circuit - the first base of the single-junction transistor 10, which consequently closes and again creates a circuit for charging the capacitor 8. Thus, the device goes into a signaling state characterized by the presence of sound frequency oscillations at the output of the second base of the single-junction transistor 10. This signal through the separation capacitor 9 and the output terminal 11 can be fed to the input of the audio amplifier of the sound producing device, powered from a controlled source, or to the input of the amplifier stage with a telephone capsule at the output.

The threshold of the device is set by a variable resistor of the voltage divider 4,

Claims (1)

Claim A voltage monitoring device comprising a single-junction transistor, the emitter of which is connected to the first output of the capacitor, the second output of which is connected to the second input terminal, the resistor is connected to the second terminal to the first input terminal, characterized in that, in order to reduce power consumption, a transistor is introduced into the device p - p - p-type, resistive voltage divider, diode, isolation capacitor, the emitter of which is connected to the emitter of a single-junction transistor, the base - with the middle output of the resistive divider the collector with the second input terminal, the first output of the resistive voltage divider and the first base of the single-junction transistor, and its second base is connected through the isolation capacitor to the output terminal and through the resistor to the first input terminal to which the second is connected via a diode output resistive voltage divider.