SU813388A1 - Key-type dc voltage stabilizer - Google Patents

Description

(54) KEY CONSTANT VOLTAGE STABILIZER

I

The invention relates to electrical engineering, in particular to power supplies of precision accuracy.

Key constant voltage stabilizers 1 are known.

The closest to the proposed is a key constant-voltage regulator containing a regulating element connected in series to the supply bus with an LCD smoothing filter at the output, a measuring element connected to the output for connecting the load, a modulator consisting of two arms, one of which is connected to the control input of the regulating element, and the diode input to the output of the other arm 2.

However, this device is unreliable because it does not provide protection against short circuits in the load.

The aim of the invention is to increase reliability.

This goal is achieved by the fact that in a key constant-voltage regulator containing a regulating element connected in series to the supply bus with an LCD smoothing filter at the output, a measuring element connected by an input with terminals for connecting the load, a modulator consisting of two arms, one of which the output circuit is connected to the control input of the regulating element, and the input through the diode is connected to the output of the other arm, the indicated other arm of the modulator is made in the form of a repeater, the input connected to the output the amplifier of the measuring element through a resistor.

In addition, in order to improve the quality of stabilization, the amplifier of the measuring element is covered by a single positive feedback through an additional voltage repeater.

The key stabilizer is additionally equipped with a low-power, fast-acting regulator.

The input of the second arm of the modulator is connected to the corresponding power supply through the trigger chain of short-term action.

Claims (2)

FIG. 1 shows a stabilizer circuit; in fig. 2 - the same, with improved parameters. The proposed stabilizer contains a control circuit 1 (modulator), a stabilizer turn-on button 2, a capacitor 3, resistors 4, 5, a regulating element 6 (transistor), a smoothing filter choke LCD 7, a smoothing filter LCD 8, a smoothing LCD capacitor 9, measuring element 10, zener diode 11 and a current-supplying resistor 12, which form the source of a reference nannuclear, an amplifying transistor 13, the input of which is connected to the output of the voltage divider with resistors 14-16, and the output through the resistor 17 to the input of the control circuit. The control circuit 1 (modulator) also contains a resistor 18, transistors 19, 20, resistors 21-23 diode 24, resistors 25-28, and a current amplifier on transistor 29. Elements 2-5 form a stabilizer switching circuit. The control circuit 1 controls the regulating element 6. The device also contains a low-voltage power source for reliably controlling the regulating element 6. The parameters of the stabilizer switch-on circuit are selected based on the smallest output transient, the device when it is turned on with button 2. The stabilizer also contains a low-power, fast-response regulator the torus 30 on the transistor, the mode of operation of which is set by resistors 31, 32 and capacitors 33, 34, the control inputs of the main regulating element 6 and low power the high-speed regulator 30 is respectively connected via a matching-amplifier cascade 35, a resistor-capacitor circuit 36, 37, and a matching amplifier cascade 38, with the output of the matching cascade 39 of the measuring element 10, the input amplifier 40 of which is covered through the matching cascade 39 with a single positive feedback; 41 - source of reference voltage; 42 load. The device operates as follows When the supply voltage is applied to the input of the device, transistors 19 and 29 are open, transistor 20 is closed, and regulating element 6 (key) is open and there is no voltage at the output of the device. After the button 2 is pressed, the transistors 19, 29 are closed, and the transistor 20 is opened, which causes the control element 6 to turn on and the normal operation begins; due to voltage ripple at the output of the device, the resistance of the transistor 13 changes from minimum to maximum, and accordingly transistor 19 will be open or closed. The frequency of operation of the modulator is determined by the parameters of the device circuit and the load current. During the breakdown or short circuit in the object, the voltage at the output of the stabilizer decreases or is close to zero, and the transistors 13, 19 open, the regulating element 6 is turned off; this state lasts indefinitely, and corresponds to the state of the circuit by its inclusion. Switching on the circuit is performed by pressing button 2, and if the short circuit on the load is eliminated, the circuit will continue normal operation, and if the defect of the object is not eliminated, the protection will turn off the device again. The device circuit contains only those elements that are necessary only for normal regulation of the output voltage; To include a stabilizer, an inclusion chain is introduced in its scheme. The device circuit does not contain elements that perform the protection function, only to turn on the device, the trigger trigger chain is inserted in its circuit. The circuit (Fig. 2) works on the principle of control by deflection and therefore completely suppresses any disturbances. However, the voltage at the output of the matching cascade of the amplifier contains full information about the output coordinate and, when a short circuit occurs on the load, the modulator 1 becomes a storage device in such a state that a constant potential corresponding to the release of the regulating element 6 is detected at its output. This state of the modulator lasts unlimited in time and corresponds to the state of the stabilizer circuit not switched on. Switching on x: stabilizer circuits are made by briefly pressing button 2 and, if the short circuit is eliminated under load, the regulating element 6 will periodically switch with the frequency specified by the reference voltage source and the mode of operation of the entire stabilization system. The parameters of the capacitor 3 and resistor 5 are selected based on the absence of a transient at the output of the stabilizer after pressing the button 2. Since in the normal state of the stabilizer circuit the button 2 is turned off, this means that the stabilizer circuit is completed — without inserting elements into the circuit, in order to protect it, i.e., the stabilizer circuit contains only those elements that are necessary for the control process. The applied principle of protection of the stabilizer is combined with the high quality of regulation when subjected to disturbances. Claim 1. Key stabilizer of constant voltage containing connected in series in the supply bar I regulate