SU1023304A1 - D.c. voltage stabilizer with overload protection - Google Patents

Abstract

PERMANENT VOLTAGE STABILIZER WITH OVERLOAD PROTECTION, ensure that the regulator and the current sensor are connected to the power bus, control amp & connected to the power output of the output, a capacitor and three resistors, given by the fact that, with a circuit for increasing the reliability of operation with a pulsed wagrueck and impairment, the base of the transistor The sequence vkdyuch @ vEnye first output to the second reavogory regulsch uyushego epem & nk,: soegoshe point and these are connected in series reznstsfov Res shye mp & A resistor and a capacitor are connected to the power output terminal, and the collector is an open source transformer and a socket with a control circuit of a ragul driver and an amp & (L -menta.

Description

The invention relates to hardware and can be used in devices for automation, automation computing, and computing devices. Yutochik nutrition is known with the protection of social control regula- tion of the element, cata chik Toimj and the threshold elements til. A disadvantage of this device is that the reliability is low when operating at a load of capacity. The closest E to the I1U invention is a DC voltage regulator with overload protection with registrutable and protective transistors, a measuring organ and a power supply, a stage eHniiTpoH, resistors and a capacitor, between the collector and the base of the protective transistor 1 or other the pos-caterer and two resistors are switched on, the resistor point is connected via a zener diode to the emitter of a regush signal transistor, and its base is connected to a collector through a cyclone; sauoiTHoro transistor and through a resistor to the output of an additional source 2 The disadvantage of this device is low reliability of operation, due to the fact that the short-circuit current 1S1I1 before the activation of the zashty (the protection device works with some specially selected 1 g) is temporary backward) i-nr-ieM co. except for the internal resistance of the power supply and the resistance, an open and saturated regudiruyuyu transistor, which can lead to its exit from the system. The disadvantage is also a layer of a known stabilizer, consisting in the necessity and use of a doped power source. The purpose of the invention is to improve reliability by simplifying the stabilizer. The delivered chain is reached — the fact that in a stabilizer and a positive voltage, for example, with overload protection, a soner — is. stitching postgrowth vkgochennye c. power bus regulating element. and a current sensor, charging the thin-member regudger circuit, is connected to the output — measuring-l-10-.usipic element, connected in parallel to the output water, transistor, the emitter of which is connected to the power output BbiBouoMs capacitor and three resistors, which is the base of the protective transistor is connected through the first and second resistors in series to the output of the regulating element, the connection point of these resistors through the third resistor and the capacitor connected in series to the power output terminal, and the collector Barrier transistor soeshshen supravp regudiruyuschngo chain guide element. The drawing is a schematic diagram of a constant voltage regulator. The device contains a regulating element 1, the control circuit of which is connected to the collector of the protective transistor 2 and to the output of the measuring amplification element 3, the output of the regulating element is connected to the input of the current sensor 4, and through two resistors 5 and 6 to the base of the protective transistor 2, point connecting resistors 5 and 6 through a series-connected capacitor 7 and a resistor 8 connected to. a protective transistor, sensor 4 current output and input of the measuring amplifier element 3. The device operates as follows. In the initial state, the load current is less than the tripping threshold of the protection, the voltage drop across the sensor 4 does not have enough current to release the protective transistor 2, and the protective transistor does not affect the operation of the stabilizer. At the time of overcurrent, the voltage on the current sensor 4 through the resistors 5 and 6 opens a protective transistor, which, by shunting the control circuit of the regulating element, limits the load current, and due to the charge of the capacitor 7, through the resistor 8, the voltage incoming to the base of the protective transistor 2, is shunted by the resistor 8, which leads to an increase in the current limit threshold. Then, as the capacitor charges, the threshold of the orpai current decreases. The appropriate choice of the ratio of resistors 5, 6 and 8 determines the ratio of the thresholds for limiting the load current during short-term and long-term overload, and the choice of the capacitor 7 determines the duration. permissible short-term overload. The proposed device has. significantly higher reliability of operation, since the load current at the moment

310233044

short-circuit is limited by selecting something that is not in favor of shutting it down,

the ratio of the resistors and the device to be found;

the shnts in the cops of the cp is-is and does not require the use of cpos) w

copied regulating element, telny power source.

Claims (1)

DC VOLTAGE STABILIZER WITH OVERLOAD PROTECTION, containing a regulating element and a current sensor connected in series to the power bus, a controlling element connected to the output of the measuring and amplifying element connected in parallel with the output terminals, a protective transistor, the emitter of which is connected to the power output terminal, a capacitor and three resistors, characterized in that, in order to increase the reliability of operation under pulsed load and simplify, the base of the protective transistor is connected through the last consistently included first and second reziotory to the output regulating member, the connection point of the resistors via the series connection of a third resistor and a capacitor potslkyuchena 'to the power output terminal, and the collector of the protective transistor is connected to the control circuit regulating element. Cop. 1 . 1023304