SU1621012A1 - Voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supply devices for electronic equipment. The purpose of the invention is to increase reliability by expanding the functionality of the protection. When the output voltage is within acceptable limits, the output of the threshold organs 21, 22 of element II 23 contains signals that prohibit a change in the state of the reversible counter 26. The keys 29-31 and thyristors 2-7 are closed ;, When the output voltage decreases, the output code counter 26 will turn out to be such that the key 30 is turned on, the thyristors are 4, 5 "I am with

Description

With the increase, the key 29 and the thyristors b, 7, turn on. With. and overcurrent increases the voltage on

a signal appears at the zero input of the counter 26 at the outputs of the reversing distributor 19 pulses

sensor 41, then the signal through the comp- - finally closing keys

Rator 42, element OR 39 enters

29-31, thyristors 2-7, 32, 33. 1 silt

to the zero-setting input of the counter 26, signals appear at the outputs of the reversing distributor 19 pulses

the closing keys

29-31, thyristors 2-7, 32, 33. 1 silt,

The invention relates to electrical engineering and can be used to stabilize a constant voltage.

The purpose of the invention is to increase reliability by extending the protection functionality.

The drawing shows a functional diagram of the stabilizer "

The voltage regulator contains a power transformer 1, the primary winding of which is connected to the input terminals, and the secondary winding, the middle output of which is connected to the common bus, is made with taps, with two second taps relative to the middle output through thyristors 2, 3 connected to the cathodes of the subsequent third 4 , 5, and the fourth 6, 7 pairs of thyristors, the anodes of which are connected to the corresponding taps of the secondary winding, control electrodes of the thyristors 2–7 through dividing diodes 8–13 are connected to the corresponding outputs of the He ate 14 thyristor unlocking pulses, while the cathodes of thyristors 2-7 were connected via a serially connected filter 15 and a control transistor 16 to the output terminal 17, a feedback circuit 18, inputs connected to the output terminal 17 and a common bus, and output to the control transistor 16, and the thyristor control unit, made on the reverse pulse distributor 19, the generator 20 and two threshold comparison bodies 21, 22, the direct and inverse inputs of each of which are cross-connected to the collector and emitter transistor 16, and the outputs are connected to a reversible pulse distributor 19, consisting of two elements, And 23 and 24, an inverter 25, a reversible counter 26, bidirectional keys 27, an initial installation node 28, and the inputs of two threshold organs 21, 22 compare

connected to the corresponding inputs of the element 23, the output of which is connected to the transfer input of the reversible counter 26, the direct input - to the input of the counter direction of the counter 26, the synchronization input of which is connected to the pulse generator 20, the inputs of the first, second, third and fourth bits are connected to the common bus, and the input of the permission of the account - to the output of the node 28 of the initial installation, the two first outputs of the reversible counter 26 are connected to the inputs of the second element 24 and to the corresponding information inputs of the bidirectional keys 27, Their inputs are combined and connected to the output of the inverter 25, whose input is connected to the output of the second element 24 and the control input of the first key 29 of the driver 14 of the thyristor unlocking pulses, and the outputs of the bidirectional keys 27 are connected to the corresponding inputs of the keys 30, 31 of the driver of the 14 pulse of unlocking thyristors. The first two branches of the secondary winding of the transformer 1 with respect to the middle output are connected to the anodes of additional thyristors 32, 33, the cathodes of which are connected to the cathodes of the rest: thyristors 2-7, and the control electrodes are connected to the output of the driver 36 pulses through the appropriate separation diodes 34, 35 switching on additional thyristors 32, 33. The input of the driver 36 of the switching pulses is connected to the output of the node 37 for controlling the output voltage containing the elements OR 38, 39 and the RS flip-flop 40, with the subsequent third and fourth The outputs of the reversible counter 26 are connected to two inputs of the element OR 38, the output of which is connected to the S-input of the trigger 40 and through the element OR 39 to the input of the zero setting of the reversing counter 26, and the R-input of the trigger 40 is connected to the output of the initial setting node 28.

51

To protect against current loads and short circuits, a resistive current sensor 41 included in the current circuit and a comparator 42, the inputs of which are connected to the terminals of the resistive current sensor 41, can be entered into the device, and the output to the second input of the second element OR 39, whose output connected to the third output of the first element OR 38 and to the input of the zero setting of the reversible counter 26.

The device works as follows.

When the device is turned on, the initial installation unit 28 sets all bits of the counter 26 to the logical zero state, where logical O is formed at the output of the second circuit 24, logical 1 is output at the inverter 25, switches 27 are in a conducting state and their outputs are logical

Thus, at the inputs of the keys 29-31, the locking signals, thyristors 2-7 are closed. At the same time, the initial installation node sets the trigger 30 of the output voltage monitoring node 37, the turn-on driver 36 includes the thyristors 32, 33 and the voltage is applied to the control transistor 16, In the process of operation, threshold comparison bodies 21, 22 control the voltage at the input of the stabilizer. Possible situations are given in the table,

Output voltage of the stabilizer

Output signal

21 22

the limits

eleven

01

1O

In the first case, shown in the table, the output of element 23 is a logical signal 1, which enters the transfer input and prohibits a change in the state of the reversible counter 26, as a result of which the signals at the output of the reversing distributor 19 pulses do not change

In the second case, the output of element 23 is a logical O signal (counting resolution), and at the input of the counting direction, the logical signal is

five

0

five

0

five

0

five

0

five

26

Thus, when the next pulse arrives, the counter will increment the unit of the existing code (instead of the 000, it will be 001). If the situation does not change with the arrival of the next pulse from generator 20, the code at the output of the counter will be 010, Toec turns off key 30 and thyristors 4, 5, and key 31 and thyristors 2, 3 will turn on - Further, if the voltage on the control transistor 16 will be within acceptable limits, then the outputs of the threshold organs 21, 22 of the comparison will be a signal of logical 1, and the code at the output of the reversing distributor 19 pulses will remain unchanged.

If the voltage drop across the control transistor 16 is not enough and the input voltage needs to be increased further, then again, as in the second case, the following signaling from the generator 20 increases the unit code of the counter 26 at the first two outputs the signal is logical 1, the output of the element 24 and the signal 1, which unlocks the key 29 and the thyristors 6, 7, the signal 1 from the output of the inverter 25 tapes the keys 27, then the signals O are formed, locking keys 30, 31 and, accordingly, the thyristors 4, 5 and 2, 3.

In the third situation, the input of the counting direction of the counter 26 is logical, the same potential at the output of element II 2Л, and with each generator pulse 20, the code at the output of the counter will decrease by a slider. If at the output of the reversing distributor 19 pulses all signals are O and Once the third situation arises, the next clock pulse of the generator at the third and fourth outputs of the counter 26 generates signals 1, which through the OR 38 element overturns the trigger 40 into state 1, the shape of the lattice 36 switching pulses will turn off the thyristors 34, 35 and through the element OR 39 and the zero-setting input of the counter 26 will transfer all its bits to the state O (keys 29-31 are closed).

When a current overload or short circuit occurs at the output of the stabilizer, the voltage drop across the resistive current sensor 41 sharply increases, the potential of the logic 1 arises at the output of the comparator 42 and goes to the input element OR 39, then to the zero input of the counter 26, and the reset At the outputs of the reversing distributor 19 pulses, signals appear that lock the keys 29-31 and, respectively, thyristors 2-7, as well as through the elements OR 39, 38, the trigger 40 tilts and turns off the thyristors 34, 35. If the outputs are reversible pulse distributor 19 pulse code 100 (key 29 is opened and thyristors 6, 7) and the second situation continues, signal 3 is formed at the third output of counter 26, which through OR 38 element tilts trigger 40 (pulse driver 36 is closed) and through OR 39 and the input of the zero setting of the counter 26 resets to O all its bits (keys 29-31 are closed)

Compared with the prototype, the described technical solution allows protection against deviation of the output voltage of the stabilizer beyond the allowable limit, from current overloads and short circuits at the output, thereby improving the reliability of the device.

Claims (1)

Invention Formula A voltage regulator containing a transformer, the primary winding of which is connected to the input terminals, the secondary winding, the middle output of which is connected to the common bus, is made with taps, the thyristors, the anodes of which are connected to the corresponding secondary taps of the secondary winding, the control electrodes are connected to the corresponding diodes the outputs of the pulse shaper unlocking the thyristors, and the cathodes through a series-connected filter, a current sensor and a control transistor are connected to the output terminal, nb the feedback input connected to the output terminals, and the output - to the base of the regulating transistor, the control unit thyristors, the pulse .generator and two threshold comparator body forward and inverse inputs each of which is cross connected to the collector and emitter of the regulating Transistor , Q 0 50 five 0 0 five ra, outputs - with reversible pulse distributor, overload comparator, input terminals connected to a current sensor, characterized in that, in order to increase reliability by expanding the functionality of the protection, the reversible pulse distributor is made on two elements And, inverter, reversible counter, two bidirectional the keys and the node of the initial installation, and the inputs of the two threshold comparison organs are connected to the corresponding inputs of the first element AND whose output is connected to the transfer input reverse first input - to the input of the counting direction, the synchronization input of the counting counter account is connected to the pulse generator, the inputs of the first to fourth bits are connected to the common bus, the counting input input is connected to the output of the initial installation node, the first two outputs of the reverse counter are connected to the inputs the second element And to the corresponding information inputs of the bidirectional keys, the control inputs of which are connected to the output of the inverter, the input of which is connected to the output of the second element And and the control input of the first the key, the outputs of the bidirectional keys are connected to the corresponding inputs of the pulse shaper, two inputs are connected to the input additional shaper of the control of the input thyristors connected to the first taps from the middle point of the transformer, the input of the aforementioned additional driver is connected to the output of the RS-trigger of the input node of the output voltage control consisting of two OR elements and an RS flip-flop, with the subsequent third and fourth outputs of the reversing counter connected to the two inputs of the first an OR element whose input is connected to the S-input of the RS flip-flop and through the second element OR to the installation input of a zero-down counter, the R input of the trigger is connected to the initial installation node, the overload comparator is connected by the output to the second input of the second OR element whose output is connected to the third input of the first element OR0