SU771635A1 - Stabilized power supply source - Google Patents

Description

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The invention relates to electrical engineering and can be used entirely secondary power sources.

Stable food sources are known, | l and (2.

One of them contains - a mains power supply, a stabilizer converter, an output rectifier and a filter, a control unit and a start unit including a series-connected resistor, a capacitor and a distor.

The disadvantages of this power source are the absence of a fixed shutdown threshold, which is necessary for reliable operation of the unit against overcurrent, usually performed by a trigger circuit, and one-time operation.

Closest to the proposed technical solution is the power source of the sodersh-yy power supply rectifier connected to the input terminal and the output to the input of a stabilizer converter, the first output winding of the transformer is co-connected via Izpr jack and the filter is connected to the output terminals, a control unit connected by the input to the output terminals, and the output through

overload protection unit - with control ™ of the stabilizer-converter input, the start-up unit connected to the output of the unit is closed against overload, and containing a serial 1 C-circuit connected in parallel with the output, the rectifier of the mains voltage HHHf and the capacitor of this circuit is on parallel to the output of the auxiliary rectifier, the input of the stabilizer of the converter, connected to the second output winding of the transformer, and the key threshold element on two transistors of different conductivity types, the base of the first transistor through the first resistor is connected to the first output of the first stabilizer a, and its collector through the second resistor to the base of the second Granzistor f resis-mountain and capacitors,

The disadvantage of this device is that the significant residual voltage of the key of the s-release circuit on the transistor is 25 and, as a result, the reliability is low.

The zero of the invention is the simplification of launching cxef.iH and raising it: a 30 dej ost.

The goal is achieved by connecting the base of the first transistor of the key threshold element in the starting unit of the stabilized power supply: via the tert resistor to its emitter, which is connected to the junction point of the serial / RU circuit capacitor with the mains voltage rectifier, and through the capacitor with the collector of the second transistor connected to the output of the startup unit, and through the second zener diode to the first output of the first zener diode, with the emitter of the second transistor and the second output of the first stub Lytron connected to the middle point The sequence RU -chain.

The drawing shows a functional diagram of a stabilized source. nickname power.

The stabilized power source contains a rectifier 1 of the mains voltage, parallel to the output of which is the start-up unit 2, consisting of a series Ru circuit on the capacitor 3 and the resistor 4 and the key threshold element on the transistor 5 of the same conductivity type with the first resistor b and the bias resistor 7 , transistor 8 of a different type of conduction with the resistor 9, two zener diodes 10, 11 and a capacitor 12, connects the base of the transistor 5 with the emitter and collector of the transistor 8, overload protection block 13, connected by an input to the block Startup 2, and OUTPUT to stabilizer-converter 14, the first output winding of the transformer of which is connected through the rectifier 15 and the filter to the output terminals, control unit 16, connecting the input to the output terminals, and output to the storage unit 13 from overload, and an auxiliary rectifier 17, the input connected to the second output winding of the transformer of the stabilizer converter 14, and the output to the start-up unit 2,

The stabilized power source operates as follows.

The voltage-network, rectified with the help of the rectifier-shchel 1 of the mains voltage, is fed to the input of the start-up unit 2, due to which the charge of the condensate 3 through the resistor 4 occurs. The transistors 5 and 8 are locked at the initial moment and the output voltage run block 2 is missing. After some time, the current in the base of transistor 5 reaches the value required for unlocking it. Unlocking transistor 5 will unlock transistor 8 and abruptly generate voltage at the output of trigger 2 due to the effect of positive feedback

It is transferred through capacitor 12. In this case, the overload protection unit is reset, in which the signals from the control unit 16 arrive at the input of the stabilizer-converter 14, creating for it the required 1 st operation mode. If there are no overloads at the source output, the stabilizer-converter 14 produces the voltages necessary to supply the load and separate power supply circuits.

In this case, the control unit 16 is powered from the main rectifier 15, and the overload protection unit 13 through the start-up unit 2 from the auxiliary rectifier 17, the auxiliary rectifier 1 .1 voltage of the circuit maintains the open state of the transistor 8 with a small residual voltage On him,

In the event that the source output is overloaded or short-circuited, after the start-up of the start-up unit 2, the overload protection unit 13 is activated, prohibiting the passage of control signals to the input of the stabilizer-converter 14, the supply of the auxiliary rectifier 17 and after some time, the voltage will drop abruptly at the output of the start-up unit 2 and the reset of the trigger 13 from overload will return to the initial state, the Condenser 3 will start charging again, through what

the start-up block 2 will re-start for a while,

If the overload is not eliminated, the cycle is repeated. At elimination of an overload at the next inclusion

Startup 2 will set the source to normal operation.

Claims (1)

Invention Formula A stabilized power source containing a mains voltage rectifier connected by an input to the input terminals and an output from a V.KHODO.M stabilizer-converter, the first output winding of the transformer of which is connected through an rectifier and filter to the output terminals, the control unit connected by an input with output terminals, output through an overload protection unit with a control input of a stabilizer converter, a trigger unit connected by output with an overload protection unit and containing a serial RC-circuit, CONNECTIONS parallel to the output of the network voltage rectifier, the capacitor of this circuit being connected parallel to the output of the secondary rectifier, the input connected to the second output winding of a stabilizer converter transformer, and a key threshold element on two transistors of different conductivity types, with the base of the first transistor connected to the first output of the first zener diode through the first resistor, and the second transistor from the second resistor and the capacitor, characterized in that, in order to simplify the starting circuit and increase reliability, the base of the first transistor of the key threshold element is connected via a third resistor to its emitter, which is connected to the point of connection of the capacitor of the series QC circuit with the output of the rectifier of the mains voltage, and through the capacitor to the collector of the second transistor, which is connected to the output of the trigger unit, and through the second zener diode to the first output of the first zener diode, eqstter second transistor and the second output of the first Zener diode connected to the midpoint of a serial T5C -circuit. Sources of information taken into account in the examination 0 1, Electronic equipment in automatics ed., Yu.I. Konev, issue 7, M ,, Owls. radio 1975, p. 42, fig. five. 2, USSR author's certificate 522494, .kl. G 05 F 1/58, $ 197; 5 (prototype).