SU1332289A1 - Source of calibrated voltage - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to secondary power supply systems for electronic equipment. The aim of the invention is to increase the reliability of the calibrated (reference) voltage source. The device has two stabilized current 11 L circuits. The first one contains. a current source 11 connected in series, a threshold two-pole (neon lamp) 13 or 18, and a voltage divider 14 or 19 are used to generate a reference voltage. The second circuit includes a trip diode 16 or 21, a signal bus 17 and a DC amplifier 5, and is an anapoweder current channel accumulator in a common load circuit. The currents are switched only at the moment when the touch switch 3 or 4 is turned on. The increased reliability of the device is due to the fact that the circuits of the sensory switching of the current and the conversion of the reference voltage into a calibrated current are connected in series. In this case, switching elements are used only at the moment of sensory switching of the reference current. 1 PC. . 5/2 W CO with:

Description

The invention relates to electrical engineering and is intended for use in constant voltage stabilizers in the implementation of the reference part of the measuring bodies.

The circuit of the invention is to increase the reliability of the source of calibrated voltage,

The drawing shows a circuit diagram of the proposed device.

The source contains an input bus 1, a reference voltage node 2, sensor-3 switches and 4 currents, a DC amplifier 5, a zero potential bus 6 and an output bus 7. The node of the reference 2 voltage source 8 includes a current source 8 and the zener diode 9, the common output of which is connected to the reference bus 10. The output circuit of the current source 11 is displayed by the reference current bus 12. The current switch 3 consists of a threshold two-pole (neon lamp) 13, an adjustable voltage divider 14, a closing contact 5 and a separation diode 16. The position 17 denotes the signal bus. Current switch 4 consists of a threshold two-pole (neon lamp) 18 adjustable setting divider

19 voltage, make contact

20 and a coupling diode 21. In the DC amplifier 5, a reverse conduction transistor 22, a current-stabilizing resistor 23, a forward-conducting transistor 24, and a calibrated resistor 25 are connected in series. The bus 26 is a power supply bus. One

from the output pins of the node 2, the reference voltage is connected to the bus 6 of zero potential. For the first time, the extreme terminals of the installation dividers 14 and 19 of the voltage are connected directly to each other (via the reference bus 10) and the second through the closing contacts 15 and 20 (via the bus 6 of zero potential). The DC amplifier 5 is connected to one of the supply terminals (the output of the resistor 25) with the zero potential bus 6, the other with the supply bus 26, and the output (output 7 and the potential 6 bus) with the terminals for connecting the load. Threshold two-terminal 3 and 18 are included in the output circuit of the source And current (through the bus 12 reference current) and the corresponding output

We are connected to the second extreme terminals of the setting dividers 14 and 19 of the voltage. The common output of the closing contacts 15 and 20 is connected to the bus 6 of zero potential. The bus connecting the first extreme terminals of the installation voltage dividers 14 and 19 (reference bus 10) is connected i between the other output terminal of the reference voltage node 2 and the potential output of the reference input of the DC amplifier 5, and the intermediate terminals of the installation dividers. The voltages 14 and 19 are connected via dividing diodes 16 and 21 (through the signal spike 17) to the potential output of the signal input of the DC amplifier 5.

The voltage source works as follows.

In the initial state, the input bus 1 and the power supply bus 26 of the DC amplifier 5 do not have a supply voltage, the current sources 11 and 8 are turned off.

When the supply voltage is applied, the current sources are turned on.

With this voltage, a stabilized voltage appears on the bus 10 of the reference voltage, and a reference current arises in the bus 12 circuit. Suppose that the two-port threshold 13 is turned on, as a result of which the reference current begins to flow through the circuit: BE) source and current drive, reference current bus 12, input threshold two-pole terminal 13, voltage setting divider 14 and reference bus 10 In the case under consideration, the magnitude of the voltage drop across divider 14 reaches a certain value, part of which, depending on the position of its slider, passes through diode 16 to the signal bus 17 and to the base of transistor 22. In the emitter circuit of the transistor G ttor 22 biliziruyuschy

the resistor 23 to the emitter circuit of the transistor 24 begins to flow a stable current, the value of which depends both on the potential on the signal bus 17 and on the resistance of the current-stabilizing resistor 23, the voltage on the output bus 7 can vary depending on the position of the slider 14 for example wives

When the operator touches the touch switch A, the contact 20 closes and the reference current of the source 11 begins to flow through the circuit: bus 12 of the reference current, input-output threshold

two-port 18, closed contact 20, - bus 6 of zero potential. In this case, the two-port 13 is turned off (the neon lamp goes out) and the reference current stops flowing through the voltage switch 14, and the two-pole 18 turns on (the neon lamp comes on). After the operator stops the switch 4, contact 20 opens, and the flow of the reference current becomes the next bus 12 of the reference current, the input-output of the threshold two-terminal 18, the voltage divider 19, the bus 10 of the reference voltage. Through voltage divider 19, a reference current begins to flow, which causes a voltage drop across it. Part of this voltage is removed from the middle slider and through diode 21 enters the signal bus 17, causing the appearance on the output bus 7 of a new calibrated voltage device.

The reliability of the pre-device is due to the fact that the circuit of sensory switching of current and circuit of converting reference voltage to calibrated current in this case are connected in series -. Switching elements are used only at the moment of sensory switching of reference current, thus ensuring reliable operation at any limit of calibrated voltage. wives The source of the calibrated voltage is short-circuit protected by a resistor 23 limiting the magnitude of the calibrated current in the collector circuit of transistor 24. After eliminating the short circuit in the load, the calibrated output voltage of the device is automatically restored. Protection against ripple on the input bus 1 is drained; it is connected with the help of a current source 1 1.

VNIIPI Order 3831/43 Circulation 863 Subscription Proizv.-poly. pr-tie, Uzhgorod, st. Project, 4

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Claims (1)

The number of current sensor switches may be; increased to 6-10, which improves the usability, since it allows for a decade sensory recruitment of a calibrated voltage with a dimension of one to two or more decades or a choice of one to six predetermined calibrated voltages, whose repeatability is stable due to stability of the reference current on the bus 12. The formula of the invention A calibrated voltage source containing a voltage reference node, one of the output terminals of which is connected to the zero potential bus, current switches with individual voltage setting dividers, the first extreme terminals of which are connected directly to each other, and the second contacts, a DC amplifier connected to one of the supply terminals with a zero potential bus, and the output to terminals dp of connecting a load, characterized in that, in order to increase the reliability of operation, its current source is entered, and each current switch is equipped with a threshold two-terminal and a separating diode, the threshold two-terminal switches are included in the output circuit of the current source and the corresponding terminals are connected to the second extreme terminals of the installation voltage dividers, the common terminal of the zero potential, the connection bus the first extreme terminals of the voltage divider is connected between another output terminal of the reference voltage node and the potential terminal of the reference input The DC amplifier is connected to the potential of the signal input of the DC amplifier via dividing diodes.