CN-224231853-U - Multi-path current conversion module for energy storage test

Abstract

The utility model provides a multipath current conversion module for energy storage test, which belongs to the technical field of energy storage test of new energy power stations and comprises a constant current source unit, an input switching circuit, a current-to-voltage conversion circuit, an operational amplifier adding circuit and an inverting amplifying circuit, wherein the power input end of each path of input switching circuit is connected with an external power supply and the constant current source unit, the output end of each path of input switching circuit is respectively connected with one current-to-voltage conversion circuit, the multipath current-to-voltage conversion circuits are commonly connected to the operational amplifier adding circuit, and the operational amplifier adding circuit is connected with the inverting amplifying circuit. The utility model can support the modules of multi-path current signal acquisition, conversion and calibration so as to improve the efficiency and the precision of energy storage test, reduce the dependence on external equipment and realize independent control, accurate measurement and efficient conversion of multi-path current.

Inventors

• NIE HUAYU
• ZHANG JINGHONG
• WANG YONG

Assignees

• 山东明科电气技术有限公司

Dates

Publication Date

20260512

Application Date

20250514

Claims (10)

1. 1. The multi-path current conversion module for energy storage test is characterized by comprising a constant current source unit, an input switching circuit, a current-to-voltage circuit, an operational amplifier adding circuit and an inverting amplifying circuit; The input switching circuit comprises a plurality of branches, the power supply input end of each branch comprises a constant current power supply input end and an external current input end, the external current input end is connected with an external power supply, the constant current power supply input end is connected with a constant current source unit, the output end of each branch is connected to a current-to-voltage circuit, the current-to-voltage circuits are connected with an operational amplifier adding circuit together, and the operational amplifier adding circuit is connected with a reverse amplifying circuit.
2. 2. The multi-path current conversion module for energy storage test according to claim 1, wherein the constant current source unit comprises a first operational amplifier, a triode, a current transformer, a fourth resistor and a tenth resistor; The first in-phase input end of the first operational amplifier receives analog signals, the first in-phase input end is connected with a current transformer through a tenth resistor, the output end is connected with a base electrode of a triode through a fourth resistor, an emitter of the triode is connected with the current transformer, the twelfth resistor and the thirteenth resistor are respectively connected with two ends of the second relay, a fourth pin of the current transformer is a constant current source output end, and the fourth pin of the current transformer is connected with an input switching circuit.
3. 3. The multi-path current conversion module for energy storage test according to claim 2, wherein the constant current source unit further comprises a second relay, a twelfth resistor, a thirteenth resistor; One ends of the twelfth resistor and the thirteenth resistor are connected in parallel to the second pin of the current transformer, and the other end of the twelfth resistor and the other end of the thirteenth resistor are respectively connected to two ends of the second relay.
4. 4. The multi-path current conversion module for energy storage testing according to claim 1, wherein the input switching circuit comprises a plurality of first relays, a first input end of each first relay is connected with an output end of a constant current source, a second input end is connected with external current, and an output end is connected with a current-to-voltage circuit.
5. 5. The multi-path current conversion module for energy storage test as claimed in claim 4, wherein the input switching circuit further comprises a plurality of first micro control units, each of the first micro control units is connected with the plurality of first relays in a one-to-one correspondence manner, and the coils of the micro control units are used for generating electricity and magnetic attraction to close electric shock of the first relays.
6. 6. The multi-channel current conversion module for energy storage test as claimed in claim 1, wherein the current-to-voltage circuit comprises a plurality of current-to-voltage sub-circuits with the same structure, the output end of each input switching circuit branch is respectively connected to the plurality of current-to-voltage sub-circuits, and the output ends of the plurality of current-to-voltage sub-circuits are commonly connected to the operational amplifier adding circuit.
7. 7. The multi-path current conversion module for energy storage testing of claim 6, wherein the current-to-voltage sub-circuit comprises a second operational amplifier, a first potentiometer, and an eighth resistor; The first inverting input end of the second operational amplifier is connected with the output end of the input switching circuit and the first end of the first potentiometer, the output end of the second operational amplifier is connected with the second end of the first potentiometer, the sliding end and the first end of the eighth resistor, and the second end of the eighth resistor is the output end of the current-to-voltage sub-circuit.
8. 8. The multi-path current conversion module for energy storage test as claimed in claim 1, wherein the operational amplifier adding circuit comprises a plurality of second resistors, a third operational amplifier and a third resistor eleventh resistor, wherein the output ends of the plurality of current-to-voltage sub-circuits in the current-to-voltage circuit are respectively connected with a plurality of second resistors in series one by one and then are connected with the inverting input end of the third operational amplifier and the first end of the third resistor, and the output end of the third operational amplifier is connected with the second end of the third resistor and is used as an adding output end.
9. 9. The multi-path current conversion module for energy storage test as claimed in claim 1, wherein the inverting amplification circuit comprises a fourth operational amplifier, a second potentiometer, a fifth resistor, a seventh resistor and a ninth resistor, wherein an addition output end of the operational amplifier addition circuit is connected to a non-inverting input end of the fourth operational amplifier through the ninth resistor, an inverting input end of the fourth operational amplifier is connected with an output end of the fourth operational amplifier through the second potentiometer, and the output end of the fourth operational amplifier outputs the converted signal through the fifth resistor.
10. 10. The multi-channel current conversion module for energy storage test according to claim 1, wherein the constant current source unit further comprises a digital-to-analog converter and a second micro control unit, an output end of the second micro control unit is connected with an input end of the digital-to-analog converter, and an output end of the digital-to-analog converter is connected with the constant current source.

Description

Multi-path current conversion module for energy storage test Technical Field The utility model belongs to the technical field of energy storage testing of new energy power stations, and particularly relates to a multipath current conversion module for energy storage testing. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. With the rapid development of new energy power stations (such as energy storage power stations, wind power distribution and storage, and the like), energy storage systems are increasingly widely applied in power systems. The energy storage system not only can balance power supply and demand, but also can improve the stability and reliability of the power grid. Energy storage systems typically include multiple battery packs or energy storage units, each of which requires independent current testing and monitoring. In the testing process of the energy storage system, the multi-path current signals need to be acquired and accurately measured in real time, and the multi-loop test generally needs a plurality of independent testing devices, so that the cost of the devices is increased, and the testing process is complicated. At present, conventional current testing equipment can only test a single loop, and cannot meet the requirement of simultaneous testing of multiple loops, so that the testing efficiency is low, and the testing cost and time are increased. In addition, the external standard signal source is calibrated, a fixed resistor or a single-range design is usually adopted, the multi-range output requirement is difficult to meet, the calibration process is complex, and the application flexibility is reduced. Disclosure of utility model Aiming at the problems of large internal deviation, low efficiency and complex calibration in the test in the prior art, the utility model provides a multi-path current conversion module for energy storage test, which can simultaneously support multi-loop current acquisition, calibration and test, improve the test efficiency and precision and reduce the test cost. In order to achieve the above purpose, the present utility model adopts the following technical scheme: A multipath current conversion module for energy storage test comprises a constant current source unit, an input switching circuit, a current-to-voltage circuit, an operational amplifier adding circuit and an inverting amplifying circuit; The input switching circuit comprises a plurality of branches, the power supply input end of each branch comprises a constant current power supply input end and an external current input end, the external current input end is connected with an external power supply, the constant current power supply input end is connected with a constant current source unit, the output end of each branch is connected to a current-to-voltage circuit, the current-to-voltage circuits are connected with an operational amplifier adding circuit together, and the operational amplifier adding circuit is connected with a reverse amplifying circuit. According to a further technical scheme, the constant current source unit comprises a first operational amplifier, a triode, a current transformer, a fourth resistor and a tenth resistor; The first in-phase input end of the first operational amplifier receives analog signals, the first in-phase input end is connected with a current transformer through a tenth resistor, the output end is connected with a base electrode of a triode through a fourth resistor, an emitter of the triode is connected with the current transformer, the twelfth resistor and the thirteenth resistor are respectively connected with two ends of the second relay, a fourth pin of the current transformer is a constant current source output end, and the fourth pin of the current transformer is connected with an input switching circuit. According to a further technical scheme, the constant current source unit further comprises a second relay, a twelfth resistor and a thirteenth resistor; One ends of the twelfth resistor and the thirteenth resistor are connected in parallel to the second pin of the current transformer, and the other end of the twelfth resistor and the other end of the thirteenth resistor are respectively connected to two ends of the second relay. According to a further technical scheme, the input switching circuit comprises a plurality of first relays, a first input end of each first relay is connected with an output end of a constant current source, a second input end of each first relay is connected with external current, and an output end of each first relay is connected with a current-to-voltage circuit. According to a further technical scheme, the input switching circuit further comprises a plurality of first micro control units, each first micro control unit is connected with the plurality of first relays in a one-to-one correspondence mode, an