RU78108U1 - DC INVERTER SOURCE - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to inverter direct current sources of the type and can be used for electric welding. The technical result that can be achieved using the proposed utility model is to increase the reliability, compactness, reduction in size and simplification of design. An inverter DC source consists of a thermal switch 1 connected in series with a network voltage of 220 V, a half-wave network bridge 2, consisting of 28 diodes 1 No. 5408, storage capacitors 3, consisting of 4 capacitors of 470 microfarads, and a key 4 for exchanging electricity, made in the form of a controlled half-bridge with a control circuit and a midpoint, which converts direct voltage to alternating voltage with a frequency of 12-15 kHz, a power transformer 5 and a rectifier unit 6, the latter being in a high-frequency half-wave rectifier with a midpoint from which the rectified voltage is then supplied to the welding electrode (not shown in Fig.), while the control circuit consists of a current sensor 7 with an adjustment resistor R1, a generator 8 and a base transformer 9, while the half-wave network bridge 2 is connected to storage tanks 3, which are connected to a controlled half-bridge made in the form of a key 4 with a midpoint, the latter is connected to a power transformer 5, which is connected to a rectifying unit 6 with a rare point, and the rectifying unit 6 is configured to supply a rectified voltage to the welding electrode, a current sensor 7 with the ability to provide steeply dipping characteristics and the formation of a voltage level depending on the regulation resistor R1 and connected to a generator 8, power

transformer 5, the base transformer 9 and through the base transformer 9 with a key 4.

IL.1

1 P.F.

Description

The utility model relates to electrical engineering, in particular to inverter DC sources and can be used for electric welding.

State of the art

A welding inverter-type power source is known, comprising a multi-cell inverter of three converters and a common output transformer assembly having three toroidal cores, on which there are three primary windings connected to the output of the corresponding converter, and a single-turn secondary winding in the form of two conductive cylinders, one of which passes inside and the other outside the cores, and the ends of the cylinders on one side are electrically connected, and on the other through a rectifier connected to narrower, while the first converter is based on a high-frequency inverter with a rigid external characteristic, the second on the basis of an inverter with a rigid characteristic and variable duty cycle, and the third on the basis of an inverter with a steeply falling external characteristic,

U ₁ <U ₂ <U ₃ ,

where U ₁ and U ₂ are the output voltages of the first and second converters, respectively;

U ₃ - open circuit voltage of the third Converter (see AS SU No. 1459838, IPC V23K 9/00, 9/10, publ. 02.23.1989).

The disadvantage of this welding power source is the design complexity, low reliability.

  Known inverter DC source for arc welding, containing a series-connected high-voltage rectifier, a first filter and a series thyristor resonant inverter, as well as a transformer, the secondary winding of which is connected to a load through a low-voltage rectifier and a second filter, an inverter control system containing two RS-flip-flops, reference voltage source, starting device, two AND circuits, two OR circuits and two pulse amplifiers, while it is equipped with a capacitor bank and ballast resistor, and the inverter control system is equipped with two electronic voltage relays, two pulse shapers, a single vibrator, two delayed pulse shapers and two electronic current relays, while the second filter is a reactor, a series thyristor resonant inverter of a bridge type, into an alternating current diagonal of which with a switching oscillating circuit, the primary winding of the transformer is turned on, and each electronic current relay is connected in series with I’m waiting for the cathode of the corresponding thyristor of the bridge inverter and its negative power bus, and the output of each electronic current relay is connected respectively to the first and second inputs of the first OR circuit and the S and R inputs of the first RS trigger, whose Q and Q outputs are through their first and second delayed pulse shapers are connected respectively to the first inputs of the first and second I circuits, the outputs of each of which are connected through their first and second pulse amplifiers to the corresponding control electrodes of the inverter thyristors, at m to the output of the low-voltage rectifier, a ballast resistor and a capacitor bank are connected in parallel, as well as the inputs of the first and second electronic voltage relays, the outputs of which, direct first and inverse second, are connected respectively to the S- and R-inputs of the second RS-flip-flop, the output of which Q, in turn, connected to the first input of the second OR circuit, and the inverse output of the latter through the first pulse shaper is connected to the second inputs of the first and second circuits

And, to the third inputs of which and the input of the second pulse shaper, a starting device is connected by its output, while the inverse output of the first OR circuit is connected to the first, starting, input of a single-shot, to the second, control, the input of which is connected to its output by a reference voltage source, and the output of a single-shot connected to the second input of the second OR circuit, to the third input of which the output of the second pulse shaper is connected (see AS SU No. 1489934, IPC V23K 9/06, published on 06/30/1989).

The disadvantage of this inverter source is the design complexity, low reliability and quality of welded joints.

The closest in technical essence and the achieved positive effect and adopted by the author for the prototype is an inverter DC source for arc welding containing a network rectifier, an inverter with a control circuit, a welding rectifier, one output of which is connected via a choke to the first output terminal, a reference voltage source connected the first output to the starting device, the element And, the output connected to the control circuit of the inverter, the maximum current comparator, the first input of which is connected is connected to the first output of the starting device, and the output is to the first input of the And element, while a welding current meter, a power meter, comparators of power, short circuit current, minimum current, voltage and minimum voltage are introduced into it, and the And element is made five-input, while the inverter is connected by an input to the mains rectifier, and the output is connected to a welding rectifier, the other output of which is connected to the second output terminal through the welding current meter, the output of the welding current meter is connected to the first inputs of the meter power suppressor, undercurrent comparator, short circuit current comparator and to the second input of the overcurrent comparator, the first output terminal is connected to the first inputs of the undervoltage comparator, voltage comparator and the second input

power meter, the output of which is connected to the first input of the power comparator, the second and gate inputs of which are connected to the second and third outputs of the starting device, the fourth output of which is connected to the second input of the short circuit current comparator, the gate input of which is connected to the output of the voltage comparator, and the output is with the second input of the And element, the third input of which is connected to the fifth output of the starting device, the fourth input is to the output of the power comparator, and the fifth input is to the output of the comparator voltage, the second input of which is connected to the second output of the reference voltage source, and the gate input is connected to the output of the minimum current comparator, the second input of which is connected to the third output of the voltage reference, the fourth output of which is connected to the second input of the voltage comparator (see US Pat. No. 2028892, IPC V23K 9/06, publ. 02.20.1995).

The disadvantage of this inverter DC source is the design complexity, large dimensions, low reliability.

Utility Model Disclosure

The objective of the proposed utility model is the development of an inverter DC source with high reliability, compactness, small dimensions and simplified design.

The technical result that can be achieved using the proposed utility model is to increase the reliability, compactness, reduction in size and simplification of design.

The technical result is achieved using an inverter DC source, which contains a thermal switch in series, a half-wave network bridge, storage tanks, a key for exchanging electricity, made in the form of a controlled half-bridge with a control circuit, a power transformer and a rectifier

unit, the control circuit consists of a current sensor with an adjusting resistor, a generator, and a base transformer, with a half-wave network bridge connected to storage capacitors that are connected to a controlled half-bridge made in the form of a key with a midpoint, the latter is connected to a power transformer, which connected to the rectifier unit with a midpoint, and the rectifier unit is configured to supply rectified voltage to the welding electrode, a current sensor with the ability to provide cool a falling characteristic and the formation of a voltage level depending on the regulation resistor R1 and connected to a generator, a power transformer, a base transformer and through a base transformer with a key.

Utility Model Implementation

An inverter DC source consists of a thermal switch 1 connected in series with a network voltage of 220 V, a half-wave network bridge 2, consisting of 28 diodes 1 No. 5408, storage capacities 3, consisting of 4 capacitors of 470 microfarads, and a key 4 for exchanging electricity, made in the form of a controlled half-bridge with a control circuit and a midpoint, which converts direct voltage to alternating voltage with a frequency of 12-15 kHz, a power transformer 5 and a rectifier unit 6, the latter being in a high-frequency half-wave rectifier with a midpoint from which the rectified voltage is then supplied to the welding electrode (not shown in Fig.), while the control circuit consists of a current sensor 7 with an adjustment resistor R1, a generator 8 and a base transformer 9, while the half-wave network bridge 2 is connected to storage tanks 3, which are connected to a controlled half-bridge made in the form of a key 4 with a midpoint, the latter is connected to a power transformer 5, which is connected to a rectifying unit 6 with rarer

point, and the rectifier unit 6 is configured to supply a rectified voltage to the welding electrode, a current sensor 7 with the ability to provide steeply dipping characteristics and the formation of a voltage level depending on the regulation resistor R1 and connected to a generator 8, a power transformer 5, a base transformer 9 and through the base transformer 9 with key 4.

An inverter DC source operates as follows. The mains voltage of 220 V through the thermal switch 1 is fed to a half-wave network bridge 2 and then to the storage tanks 3, intended for the exchange of electricity with a key 4 and a power transformer 5, while the key 4, which is a controlled half-bridge with a midpoint, converts the constant voltage into alternating frequency of 12-15 kHz, and the rectifier unit 6, which is a high-frequency half-wave rectifier with a midpoint, rectifies the voltage, while the rectified voltage is then fed to a sharp electrode, and a steeply falling characteristic is provided by a current sensor 7, which generates a voltage level depending on the control resistor R1, this voltage is supplied to a generator 8, made on 4 transistors HRV 53/16 and HRV 56/16, and operates in the standby mode of feedback signals voltage and current feedback and switches the key 4 through the base transformer 9, made on a ferrite ring brand NM 2000 K38-16-8.

The proposed utility model in comparison with the prototype and other well-known technical solutions has the following advantages:

- increase of reliability in work;

- compactness, reduction in size;

- simplification of the design;

- reduction in manufacturing costs.

Claims (1)

An inverter direct current source containing a thermal switch in series, a half-wave network bridge, storage capacitors, a key for exchanging electricity, made in the form of a controlled half-bridge with a control circuit, a power transformer and a rectifier unit, characterized in that the control circuit consists of a current sensor with adjustment resistor R1, the generator and the base transformer, while the half-wave network bridge is connected to the storage capacitors, which are connected to a half-bridge made in the form of a key with a mid-point, the latter is connected to a power transformer, which is connected to a rectifying unit with a mid-point, and the rectifying unit is configured to supply a rectified voltage to the welding electrode, a current sensor with the ability to provide steeply dipping characteristics and the formation of a voltage level depending on the control resistor R1 and connected to the generator, power transformer, base transformer and through the base transformer with a key.