SU654937A1 - Relay-type ac voltage stabilizer - Google Patents

Description

I

The invention is related to electrical engineering and can be used for electroplating devices for various purposes.

A ferroresonant alternating voltage stabilizer is known, consisting of an unsaturated throttle and a parallel circuit formed by a saturated choke and capacitor ij.

The disadvantages of this voltage regulator are: small K11D, severe distortions of the shape of the output voltage curve, depending on the type of load, the dependence of the output voltage on the frequency of the supply network, a large magnetic field of dissipation, large weight and size.

Of the known AC voltage regulators, the one closest to the technical entity is an alternating voltage relay stabilizer containing a transformer connected to the input terminals of the power supply, the primary winding of which is made with taps, and the secondary winding is connected by an output to a rectifier with a filter connected by output to the outputs for connecting the load, but at least two relays with control prices 2.

its disadvantage is the preservation of overvoltages on the network part of the transformer winding when the device is operated from

2

newer networks, reducing reliability. In addition, it is not possible to use block elements in a known AC voltage stabilizer.

powering common radio devices such as TVs, etc., because the voltages in the secondary windings of the power transformer used for the anode circuit

and the lamp circuit will vary in proportion to the voltage variation of the network. Thus, a known stabilizer can only be used as a separate device designed to power other devices, which limits its scope.

The aim of the invention is to increase the reliability of the extended field of use.

The goal is achieved by the fact that a relay with an alternating voltage, containing a supply transformer connected to the input terminals, whose primary winding is made with taps, and

the secondary winding is connected by an input to a rectifier with a filter connected by an output to the terminals for connecting the load, at least two relays with control circuits, a resistance divider is inserted

voltage connected to the output of the rectifier, while the control circuits of these relays are connected to the middle tap and to the intermediate tap of the resistive voltage divider through the switching contacts of both relays, and the tapes of the transformer primary winding are connected to other contact groups of the mentioned relay.

FIG. 1 is a functional diagram of a relay voltage regulator; in fig. 2 and 3 are the basic electrical circuits of the relay control circuits.

The stabilizer contains a transformer 1, the primary winding of which is made with taps 2-4, a rectifier with filter 5 in the secondary winding of a transformer, a resistive divider of the voltage connected to the output of the rectifier, a relay 7 and 8 with the corresponding control circuits 9 and 10, In this case, the latter are connected to the middle tap and to the intermediate tap of the divider 6 via the switching contacts And and 12 relays / and 8, respectively, and the primary windings of the transformer are connected to one of the input pins via other contact groups 13 and 14 of the first, second relay, respectively.

The control circuit 9 (see Fig. 2) is the key Zsilitel on the transistors 15 and It), forming a composite transistor. On the oases day of transistor ib, a zener diode 17 is turned on. B The collector circuit of ib is connected to a relay 7, shunted by a diode 18 for protection against overvoltages and a capacitor 19 of necessary capacity supporting the desired connection to the relay at the moment of switching its contacts. 1 The voltage divider b resistors and resistors 2U-22 determine the operating modes of transistors 1b and 16. The collector circuit control circuit 9 of transistors 15 and 16 is connected to the output of the rectifier with a filter 5, and the base circuit through the switching contacts 11 of the relay 7 to the middle tap divider 6 for example.

Control iU circuit (see Fig. 3} is a key transistor amplifier

23 and 24. In the collector circuit of the transistor

24 on relay 8, diode-shunted

25dl overvoltage protection and a capacitor 26 of the required capacity supporting the desired terminal on the relay at the moment of switching its contacts. A zener diode 27 is connected to the base circuit of transistor 23. The voltage divider 6 resistors and the resistors 28-30 determine the operating modes of the transistors 23 and 24 of the amplifier. The collector circuits of the transistors 23 and 24 are connected to the output of the rectifier with filter 5, and the basic circuit of the transistor 23 is connected to the middle tap of the divider

6 voltages through switching contacts 12 relays 8.

The relay voltage regulator operates as follows. 5 Voltage is applied to the load from the secondary windings of the transformer 1 operating in linear mode, and the network is fed to its primary winding, and its taps 2, 3 or 4 are connected to the network via 10 pins 13 and 14 of relay 7 and 8 depending on the value network voltage The initial state of the contacts 13 and 14 is such that at the rated voltage range of the supply mains it is connected to the tap 3 of the transformer.

In this case, the load and output of the rectifier with filter 5 will be nominal. The control circuits 9 and 10 of the relay will be in such a state that the windings of the relay 7 and 8 are de-energized.

When the supply voltage rises against the norm, the voltage at the output of the rectifier with the filter 5 rises, the zener diode 17 of the control circuit 9 is turned off, and the current of the transistors 15 and 16, which begin to conduct this, turns on the relay 7 and the capacitor 19 charges. its contacts 13 connects the network to the transformer step output 2. Due to this, the voltages on the secondary windings of the transformer become nominal, but the relay 7 does not let go, because the capacitor 19 is charged, and through the second switching

5 contacts 11 of the relay 7 to the zener diode 17 of the control circuit 9 is supplied higher than the initial state of the circuit, the voltage taken from another point of the voltage divider 6, supporting

0 zener diode 17, and hence the relay 7 in the on state.

If the network voltage from an increased value returns to its non-terminal value, as it decreases

5 remains applied to the tap 2 of the transformer 1, which is intended for increased exposure, therefore the voltage at the output of the rectifier with the filter 5 decreases, which means that the voltage decreases,

0 supplied to the zener diode 17, which turns it off, so the transistors 15 and 16 are closed, the capacitor 19 is discharged, and the relay 7 is de-energized. As a result, his pins 13 will connect the network to tap 3

5 transformers rated for nominal voltage, and contacts 11 will occupy the initial polishing. The circuit has returned to its original state. The load voltage will be nominal.

Q When the supply voltage decreases against the norm, the output voltage of the rectifier with filter 5 goes up, the Zener diode 27 of the control circuit 10, which determines the response threshold of the key amplifier at transistors 23 and 24,

closes. When this happens, transistor 23 closes and transistor 24 opens, capacitor 26 charges, and relay 8 in the collector circuit of transistor 24 is activated. One of its pins 14 connects the network to the downstream terminal 4 of the transformer. Due to this, the voltage on the secondary windings of the transformer becomes nominal, but the relay 8 does not let go, because through its second switching contacts 12 to the zener diode 27 a lower voltage is applied compared to the actual state of the circuit, taken from another point voltage dividers 6 supporting the zener diode 27, and hence the relay 8, in the on state.

If the network voltage from the low value returns to its nominal value, then as it increases, it remains to be given to the outlet 4 of the transformer designed for low voltage, so the voltage at the output of the rectifier with filter 5 will increase, which means that the voltage will increase The voltage supplied to the zener diode 27, which pierces it and opens the transistor 28, as a result of this, the base-emitter junction of the transistor 24 is bridged, so the latter is closed, the capacitor 26 is discharged, and the relay 8 is de-energized. One of its corg contacts 14 connects the network to a tap 2 of the transformer, designed for a nominal voltage, its other pins 12 will take a neural position on the middle tap of the divider 6 voltage. The circuit has returned to its original state. Load voltage will be nominal.

The introduction of a resistive voltage divider connected to the output of the rectifier, and an additional group of contacts for switching for two relays, provides for the required operation mode of each connection, as well as connecting the transformer primary windings to the network through other contact grounds of the relay favorably distinguishes this stabilizer variable voltage from similar known ones, since it is more reliable and allows the use of such a power transformer, which are used in circuits widely used GOVERNMENTAL radio devices (nanrimer, televisions and so on. n.). It is possible to provide

similar radio devices with stabilized voltage by additionally introducing into them the nntan units of the resistive divider of the design and the relay with control circuits.

Claims (2)

1. Belopolsky I.I. Power supply of radio devices. M. - L., “Energie, 1965, p. 230-232. 2. USSR author's certificate number 316085, cl. G 05F 1/20, 1969.