SU1686572A1 - Device for power supply of a user - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supplies, such as converters for powering a power tool. The purpose of the invention is to reduce power consumption by eliminating idling of the voltage converter. The device contains a contactor 1 turning on the voltage converter 2, a step-down transformer 4, a current relay 5, a time relay 10, a voltage supply contactors 6 and a consumer switching key 8. If the power switch 8 of the power tool 8 is closed before the holding time, the relay The current 5 will disconnect by its contact 13 of the time relay 10. By varying the length of the shutdown delay, it is possible to set the optimal control mode of the voltage converter. 1 il.

Description

The invention relates to the field of electrical engineering and can be used in power supplies, such as frequency converters for powering a power tool.

The aim of the invention is to reduce energy consumption by eliminating the idling voltage converter.

The drawing shows an electrical diagram of a device for supplying power to consumers.

The device comprises a contactor 1 for turning on the voltage converter 2, contacts 3 of which are included in the power circuit of the voltage converter, step-down transformer 4, the primary winding of which is connected to the network to the contacts of the contactor 1, current relay 5, contactors 6 for supplying voltage to the consumer (power tool) 7 and key 8 consumer inclusion.

Contactors 6 for supplying voltage to the consumer with consumers switching keys 8 connected in series with them are connected to the secondary winding of the transformer via the current relay 5, the contactor 1 for turning on the voltage converter is connected to the secondary winding of the transformer through the opening contact 9 of the time relay 10, which provides a delayed shutdown of this contactor, and in parallel connected make contacts 11 and 12 of the current relay and the contactor 1 for turning on the voltage converter, the time relay 10 is connected to the secondary winding of the transformer Rator through the opening contact 13 of the current relay and the closing contacts 11 and 12. The switch is indicated at 14.

The device operates as follows.

The circuit is connected to the network by the switch 14. When the consumer switch on key 8, located on the power tool 7, is closed through the contactor 6 and the current relay 5, current flows, the current relay 5 closes its make contact 11, and then the contactor 1 turns on, blocking itself by contact 12, the converter voltage is started and through the closed contacts of the contactor 6, the voltage from the output of the voltage Converter is supplied to the electric motor of the power tool 7.

Several power tools can be connected to the output of the voltage converter, and each feeder is connected with its own contactor located in the converter equipment block.

If there is no load at the converter output at the moment of opening the consumer power switch and disconnecting the contactor 6 of the last power tool, the current in the circuit of the current relay 5 stops, it closes its contact 13, connecting the time relay 10 through closed contacts 11 and 12 to the secondary winding of the transformer, while starting from the moment of contact 13 closing, the time relay, after the set time has passed, opens its contact 9 in the circuit of contactor 1 and the latter disconnects the converter from the network by contacts 3.

If the key 8 to turn on the consumer of the power tool will be closed before the expiration of the holding time, then the current relay 5 will disconnect the time relay 10 from the power source with its contact 13 and it will return to its original position, ensuring uninterrupted operation of the converter and the power tool. If the process cycle changes, the delay time must be changed.

This can be achieved by adjusting the time relay accordingly. Due to this, you can set the optimal control mode of the voltage Converter.

Claims (1)

Claim A device for supplying power to consumers, comprising a voltage converter, contactors for supplying voltage to consumers, switching keys for consumers, a switching unit for a voltage converter, step-down transformer, the primary winding of which is connected to terminals for connecting to a network, the first terminals of the windings of contactors for supplying voltage to consumers are connected between themselves, and their second terminals through the corresponding switching keys of the consumers are connected to the first terminal of the secondary winding of the step-down transformer. the closing contacts of the voltage supply contactors to the consumers are connected between the output terminals of the voltage converter and the terminals for connecting the corresponding consumer, characterized in that, in order to reduce power consumption by eliminating the idling of the voltage converter, a current relay, a time relay are introduced into it, and the converter switching unit is made in the form of a contactor, the winding of which is connected to the secondary winding of a step-down transformer through the opening contact of the time relay and in parallel with union of make contacts of the contactor inclusion. voltage converter and current relay, the first output of the step-down transformer winding is connected through series-connected time relays and the NC contact of the current relay to the combined terminals of the NC contact of the time relay and the NO contact of the current relay, and the second terminal of the winding of the step-down transformer through the current relay winding connected to the first terminals of the contactors supply voltage to consumers.