CN212366918U

CN212366918U - Converter is decompression protection device in twinkling of an eye

Info

Publication number: CN212366918U
Application number: CN202021415446.8U
Authority: CN
Inventors: 楚好军
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2021-01-15
Anticipated expiration: 2030-07-17

Abstract

A transient voltage loss protection device for a frequency converter belongs to the technical field of frequency converter protection equipment. The method is characterized in that: the battery pack control circuit comprises a battery pack U, a control module and connecting terminals DC +, DC-, KA and KB, wherein the connecting terminals DC + are connected with the positive electrode of the battery pack U after being connected with the control module in series, the connecting terminals DC-are connected with the negative electrode of the battery pack U, and the signal input end and the signal output end of the control module are respectively connected with the connecting terminals KA and KB. This converter no-voltage protection device passes through the group battery and stores the electric energy in the twinkling of an eye, runs into the electric wire netting at the converter and takes place to shake when electric fault no-voltage, and the group battery can instantaneous discharge, gives the converter power supply automatically, ensures the converter safe operation, does not receive the electric wire netting to shake the influence of electric fault, and can not influence the function and the performance of converter itself.

Description

Converter is decompression protection device in twinkling of an eye

Technical Field

A transient voltage loss protection device for a frequency converter belongs to the technical field of frequency converter protection equipment.

Background

The frequency converter is a product for controlling the operation of the motor, and is widely applied to various fields such as industrial production and the like. The frequency converter works by using a power supply of a power grid, and the frequency converter stops running if the power grid loses voltage instantly during running. In actual operation, due to lightning, equipment failure, high-power equipment starting, power grid short circuit, dual power supply switching and the like, the power grid can lose voltage instantaneously, which is commonly called as power shaking. The voltage-loss time of the common voltage interference is 0.5-2 seconds, and the voltage interference and voltage-loss time is enough to stop the undervoltage of the frequency converter. Some operations, such as coal-fired boiler feeder systems, tunnel kiln conveyor systems, etc., do not allow for automatic shutdown, which can result in significant product loss or significant safety issues.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, and the instantaneous voltage loss protection device of the frequency converter, which enables the frequency converter not to be automatically stopped when the grid is subjected to voltage interference and voltage loss, is provided.

The utility model provides a technical scheme that its technical problem adopted is: this converter is decompression protection device in twinkling of an eye, its characterized in that: the battery pack control circuit comprises a battery pack U, a control module and connecting terminals DC +, DC-, KA and KB, wherein the connecting terminals DC + are connected with the positive electrode of the battery pack U after being connected with the control module in series, the connecting terminals DC-are connected with the negative electrode of the battery pack U, and the signal input end and the signal output end of the control module are respectively connected with the connecting terminals KA and KB.

Preferably, the control module comprises a contactor KM1, a power converter DY and an indicator lamp HR, wherein a connecting terminal KA is simultaneously connected with one end of a coil of the contactor KM1 and one end of the indicator lamp HR, the other end of the coil of the contactor KM1 and the other end of the indicator lamp HR are simultaneously connected with a signal input end of the power converter DY, and a normally open contact KM1-1 of the contactor KM1 is arranged between the positive electrode of the battery pack U and the connecting terminal DC +;

the signal output end of the power converter DY is connected with the wiring terminal KB, the positive electrode of the power converter DY is connected with the wiring terminal DC +, and the negative electrode of the power converter DY is connected with the wiring terminal DC-.

Control between battery pack U and the binding post DC + has been realized through contactor KM1, and control is convenient, and pilot lamp HG can instruct the work of the coil of contactor KM 1.

Preferably, the battery pack U is a plurality of lithium batteries or nickel batteries connected in series.

Preferably, the battery pack further comprises a diode D, the diode D is arranged between the anode of the battery pack U and the control module, the current input end of the diode D is connected with the anode of the battery pack U, and the current output end of the diode D is connected with the control module. The diode D has a one-way output protection function, and a power supply of the frequency converter cannot recoil the battery pack U.

Preferably, the battery pack further comprises a circuit breaker QF arranged between the positive pole of the battery pack U and the control module. The breaker QF can play the role of overload protection.

Preferably, the battery charging device further comprises a battery charging module, wherein an input positive electrode of the battery charging module is connected with the connecting terminal DC +, an input negative electrode of the battery charging module is connected with the connecting terminal DC-, an output positive electrode of the battery charging module is connected with a positive electrode of the battery pack U, and an output negative electrode of the battery charging module is connected with a negative electrode of the battery pack U. The battery charging module can charge the battery pack U when the frequency converter operates normally, and the voltage stability of the battery pack U is ensured.

Preferably, the battery charging system further comprises a battery management system and a human-computer interface, the battery management system is connected with the battery pack U through a signal line, the battery management system is connected with the human-computer interface through a display bus, and the battery charging module is further connected with the battery management system and supplies power to the battery management system.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

this converter no-voltage protection device passes through the group battery and stores the electric energy in the twinkling of an eye, runs into the electric wire netting at the converter and takes place to shake when electric fault no-voltage, and the group battery can instantaneous discharge, gives the converter power supply automatically, ensures the converter safe operation, does not receive the electric wire netting to shake the influence of electric fault, and can not influence the function and the performance of converter itself.

Drawings

Fig. 1 is a schematic circuit diagram of an instantaneous voltage loss protection device of a frequency converter.

Detailed Description

Fig. 1 is a preferred embodiment of the present invention, and the present invention will be further explained with reference to fig. 1.

A converter instantaneous voltage loss protection device comprises a battery pack U, a control module, a connecting terminal DC +, DC-, KA and KB, wherein the connecting terminal DC + is connected with the positive electrode of the battery pack U after being connected with the control module in series, the connecting terminal DC-is connected with the negative electrode of the battery pack U, and the signal input end and the signal output end of the control module are respectively connected with the connecting terminal KA and the KB. This converter no-voltage protection device passes through the group battery and stores the electric energy in the twinkling of an eye, runs into the electric wire netting at the converter and takes place to shake when electric fault no-voltage, and the group battery can instantaneous discharge, gives the converter power supply automatically, ensures the converter safe operation, does not receive the electric wire netting to shake the influence of electric fault, and can not influence the function and the performance of converter itself.

The present invention is further described with reference to specific embodiments, however, it will be understood by those skilled in the art that the detailed description given herein with respect to the drawings is for better explanation and that the present invention is necessarily to be construed as limited to those embodiments, and equivalents or common means thereof will not be described in detail but will fall within the scope of the present application.

Specifically, the method comprises the following steps: as shown in fig. 1: the instantaneous voltage loss protection device for the frequency converter further comprises a circuit breaker QF, a diode D, a battery charging module, a battery management system and a shunt. The control module comprises a power converter DY, an indicator light HR and a contactor KM.

The connecting terminal DC + is simultaneously connected with one end of a normally open contact KM1-1 of the contactor KM1, the anode of the power converter DY and the input anode of the battery charging module, the other end of the normally open contact KM1-1 of the contactor KM1 is connected with the current output end of the diode D, and the current input end of the diode D is connected with the anode of the battery pack U after being connected with the breaker QF in series. The negative pole of the battery pack U is connected with the current output end of the current divider. The connection terminal DC-is simultaneously connected to the input negative pole of the battery charging module, the negative pole of the power converter DY and the current input terminal of the shunt.

The connecting terminal KA is simultaneously connected with one end of the coil of the contactor KM1 and one end of the indicator light HR, the other end of the coil of the contactor KM1 and the other end of the indicator light HR are simultaneously connected with a signal input end of the power converter DY, and a signal output end of the power converter DY is connected with the connecting terminal KB.

The battery management system comprises a BMS battery management main module and two BMS battery management slave modules, in the embodiment, the battery pack U comprises a plurality of lithium batteries or nickel batteries which are arranged in series, the BMS battery management main module and the BMS battery management slave modules are respectively connected with the corresponding plurality of batteries in the battery pack U through signal lines, and the BMS battery management main module is simultaneously connected with the two BMS battery management slave modules through an internal communication bus, so that the voltage and the temperature of the battery pack U are detected. The battery management system is connected with a human-machine interface through a display bus, and in the embodiment, the human-machine interface is an HMI display interface.

The output positive pole of the battery charging module is connected with the positive pole of the battery pack U, the output negative pole of the battery charging module is connected with the current output end of the shunt after being connected with the series power management system, and the signal output end of the battery management system is also connected with the signal input end of the battery charging module through a control line, so that the battery charging module is controlled to charge the battery pack U.

The outer shell is arranged outside the electricity interference protection device of the frequency converter, and the connecting terminals DC +, KA, KB and DC-are sequentially arranged at the lower end of the outer shell. When the connecting terminal is used, the connecting terminal DC + is connected with the direct current positive pole of the frequency converter, the connecting terminal DC-is connected with the direct current negative pole of the frequency converter, and the connecting terminals KA and KB are connected with the operation signal of the frequency converter. The working voltage of the frequency converter is 540V, and the voltage at the two ends of the battery pack U is 440V.

The working process of the interference electricity protection device of the frequency converter is as follows: when the frequency converter normally operates, the coil of the contactor KM1 is electrified, and the indicator light HG is on; the normally open contact KM1-1 of the contactor KM1 is closed, but the battery pack U is not discharged due to the presence of the diode D.

When the power grid is in a power-dazzling fault, the voltage of the frequency converter can be reduced to be lower than 440V, the battery pack U discharges and automatically supplies power to the frequency converter, when the power grid is recovered to be normal, the frequency converter recovers to be normal, and the battery charging module charges the battery pack U to ensure the voltage stability of the battery pack U.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a converter is decompression protection device in twinkling of an eye which characterized in that: the battery pack control circuit comprises a battery pack U, a control module and connecting terminals DC +, DC-, KA and KB, wherein the connecting terminals DC + are connected with the positive electrode of the battery pack U after being connected with the control module in series, the connecting terminals DC-are connected with the negative electrode of the battery pack U, and the signal input end and the signal output end of the control module are respectively connected with the connecting terminals KA and KB.

2. The instantaneous voltage loss protection device of the frequency converter according to claim 1, characterized in that: the control module comprises a contactor KM1, a power converter DY and an indicator lamp HR, a connecting terminal KA is simultaneously connected with one end of a coil of the contactor KM1 and one end of the indicator lamp HR, the other end of the coil of the contactor KM1 and the other end of the indicator lamp HR are simultaneously connected with a signal input end of the power converter DY, and a normally open contact KM1-1 of the contactor KM1 is arranged between the positive electrode of a battery pack U and a connecting terminal DC +;

3. The instantaneous voltage loss protection device of the frequency converter according to claim 1, characterized in that: the battery pack U is formed by connecting a plurality of lithium batteries or nickel batteries in series.

4. The instantaneous voltage loss protection device of the frequency converter according to claim 1, characterized in that: the battery pack U power supply device is characterized by further comprising a diode D, the diode D is arranged between the anode of the battery pack U and the control module, the current input end of the diode D is connected with the anode of the battery pack U, and the current output end of the diode D is connected with the control module.

5. The instantaneous voltage loss protection device of the frequency converter according to claim 1 or 4, characterized in that: the battery pack control circuit also comprises a circuit breaker QF arranged between the positive pole of the battery pack U and the control module.

6. The instantaneous voltage loss protection device of the frequency converter according to claim 1, characterized in that: the battery charging device is characterized by further comprising a battery charging module, wherein an input positive electrode of the battery charging module is connected with the connecting terminal DC +, an input negative electrode of the battery charging module is connected with the connecting terminal DC-, an output positive electrode of the battery charging module is connected with a positive electrode of the battery pack U, and an output negative electrode of the battery charging module is connected with a negative electrode of the battery pack U.

7. The instantaneous voltage loss protection device of the frequency converter according to claim 6, characterized in that: the battery charging system is connected with the battery pack U through a display bus, and the battery charging module is also connected with the battery management system and supplies power to the battery management system.