Control system suitable for instantaneous current control

Abstract

The invention discloses a control system suitable for instantaneous current control, and relates to the technical field of current control. Comprising a hybrid energy storage module, an inversion module, a voltage detection module, a current detection module, an intelligent switch module and a control module, and the hybrid energy storage module is used for releasing or storing current; the inversion module is used for converting the direct current into alternating current; the voltage detection module is used for detecting the voltage of the hybrid energy storage module; the current detection module is used for detecting output current; the first input end of the intelligent switch module is connected with the first output end of the current detection unit, and the intelligent switch module is used for controlling a load access sequence; and the control module is used for judging whether the instantaneous current exceeds a threshold value or not and executing corresponding operation. The service life of the storage battery pack is effectively prolonged, and it is guaranteed that the discharge current of the storage battery pack is within the safe operation range.

Description

Technical Field

[0001] The present invention relates to the technical field of current control, and in particular to a control system suitable for instantaneous current control. Background Art

[0002] With the continuous development of the automobile industry, the application of on-board batteries is increasing. It is necessary to convert the DC power of the battery into 50Hz / 220V AC power to drive the on-board equipment. DC energy storage is an important technology in the application fields of new energy vehicles, mobile energy storage power stations, etc. In order to ensure the safety of on-board electrical equipment, it is necessary to limit the output current of the on-board battery to prevent the equipment from being burned by the instantaneous current. Among the existing energy storage devices, single battery energy storage has the characteristics of high energy density, but it also has the problem of difficulty in charging and discharging large currents; supercapacitors have the advantages of high specific power, large current charging and discharging, fast charging and discharging reaction time, and long cycle life, but their disadvantages are low specific energy and short cruising range. The hybrid energy storage power supply composed of a battery pack and a supercapacitor pack has the advantages of both high energy density and high power density, which can solve the problem of instantaneous large current demand of impact loads and has good application prospects in the field of industrial production.

[0003] Therefore, how to provide a control system suitable for instantaneous current control to solve the difficulties existing in the prior art is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0004] In view of this, the present invention provides a control system suitable for instantaneous current control, which can optimize and improve the performance of current control and has good market prospects and application value.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A control system suitable for instantaneous current control, comprising a hybrid energy storage module, an inverter module, a voltage detection module, a current detection module, an intelligent switch module and a control module.

[0007] Hybrid energy storage module, used to release or store electric current;

[0008] An inverter module, connected to the output end of the hybrid energy storage module, for converting direct current into alternating current;

[0009] A voltage detection module is connected to the input end of the hybrid energy storage module and is used to detect the voltage of the hybrid energy storage module;

[0010] A current detection module, connected to the first output terminal of the inverter module, for detecting the output current;

[0011] An intelligent switch module, a first input terminal of which is connected to a first output terminal of the current detection unit, and includes a plurality of switches of different priorities connected in parallel, for controlling a load access sequence;

[0012] The control module is connected to the input end of the hybrid energy storage module, the second output end of the voltage detection module, the second output end of the current detection unit and the second input end of the intelligent switch, and is used to determine whether the instantaneous current exceeds the threshold and perform corresponding operations.

[0013] Optionally, the hybrid energy storage module includes a battery group, a supercapacitor group and a current limiting unit, and sets the minimum voltage and maximum voltage of the battery group and the maximum voltage across the supercapacitor group.

[0014] Optionally, when it is detected that the voltage across the battery group is lower than the set minimum voltage, the supercapacitor group discharges; when the voltage across the battery group is higher than the set maximum voltage, the battery group and the supercapacitor group are controlled to be connected, and the supercapacitor group is charged; when the voltage across the battery group is higher than the set maximum voltage and the voltage across the supercapacitor group is higher than the set maximum voltage, the system stops running.

[0015] Optionally, the intelligent control switch module also includes a switch master control unit for detecting the rated power of the load connected through the switch in the current circuit.

[0016] Optionally, the control module includes setting a current limiting threshold, determining whether the instantaneous current exceeds the current limiting threshold, and if so, controlling the current limiting unit to limit the current output value; if not, controlling the current obtained by the current limiting unit to connect or disconnect the load according to the switch priority, and determining whether the instantaneous current is stably less than the current limiting threshold, and if so, slowly increasing the output current.

[0017] Optionally, determining whether the instantaneous current exceeds the current limiting threshold includes: filtering the instantaneous current to obtain an instantaneous filtered current corresponding to the instantaneous current, obtaining and counting the peak value of the instantaneous filtered current, limiting the current output value when the peak value exceeds the current limiting threshold, and clearing the peak value count and recalculating.

[0018] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a control system suitable for instantaneous current control, which has the following beneficial effects: 1) The present invention outputs a steady-state current through the battery pack of the hybrid energy storage power supply, and fully considers the port voltage operating range of the battery pack and the supercapacitor group, thereby limiting the output current of the battery pack, avoiding over-current discharge of the battery pack, and ensuring that the discharge current of the battery pack is within its safe operating range. The system has high efficiency, strong controllability, and a long life of the energy storage power supply; 2) The present invention sets an operating mode based on instantaneous current, which effectively protects the battery pack and the supercapacitor group, and effectively extends the service life of the battery pack while meeting the instantaneous current requirements of the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 The present invention discloses a control system block diagram suitable for instantaneous current control. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Reference Figure 1 As shown, the present invention discloses a control system suitable for instantaneous current control, including a hybrid energy storage module, an inverter module, a voltage detection module, a current detection module, an intelligent switch module and a control module.

[0023] Hybrid energy storage module, used to release or store electric current;

[0024] An inverter module, connected to the output end of the hybrid energy storage module, for converting direct current into alternating current;

[0025] A voltage detection module is connected to the input end of the hybrid energy storage module and is used to detect the voltage of the hybrid energy storage module;

[0026] A current detection module, connected to the first output terminal of the inverter module, for detecting the output current;

[0027] An intelligent switch module, a first input terminal of which is connected to a first output terminal of the current detection unit, and includes a plurality of switches of different priorities connected in parallel, for controlling a load access sequence;

[0028] The control module is connected to the input end of the hybrid energy storage module, the second output end of the voltage detection module, the second output end of the current detection unit and the second input end of the intelligent switch, and is used to determine whether the instantaneous current exceeds the threshold and perform corresponding operations.

[0029] Furthermore, the hybrid energy storage module includes a battery group, a supercapacitor group and a current limiting unit, and sets the minimum voltage and maximum voltage of the battery group and the maximum voltage across the supercapacitor group.

[0030] Specifically, the battery pack adopts an electrochemical energy storage battery pack, including a lead-acid battery pack, a nickel-metal hydride battery pack or a lithium-ion battery pack.

[0031] Furthermore, when it is detected that the voltage across the battery group is lower than the set minimum voltage, the supercapacitor group discharges; when the voltage across the battery group is higher than the set maximum voltage, the battery group and the supercapacitor group are controlled to be connected, and the supercapacitor group is charged; when the voltage across the battery group is higher than the set maximum voltage and the voltage across the supercapacitor group is higher than the set maximum voltage, the system stops running.

[0032] Furthermore, the supercapacitor group sets a minimum voltage. When the voltage across the supercapacitor group is lower than the minimum voltage, the output current of the supercapacitor group is set to 0; when the voltage across the battery group is within a suitable voltage range, the voltage across the supercapacitor group is within a suitable voltage range, and when the required instantaneous current is less than the maximum current that the battery group can output, the current required by the load is provided by the battery group; when the voltage across the battery group is within a suitable port voltage range, the voltage across the supercapacitor group is within a suitable port voltage range, and the required instantaneous current is greater than the maximum current that the battery group can output, the output current of the battery group is equal to the maximum current it can output, and the output current of the supercapacitor group is equal to the required instantaneous current minus the current output by the battery group, thereby ensuring stable current output.

[0033] Furthermore, the intelligent control switch module also includes a switch master control unit for detecting the rated power of the load connected through the switch in the current circuit.

[0034] Specifically, the switch master control unit can control the opening and closing of electrical appliances, and can transmit the user's opening and closing signals for the switches to individual switches; a data storage unit is provided inside each switch to store the rated power information of the electrical appliances corresponding to each switch and receive its opening and closing signals. The switch master control unit receives information sent by all data storage units; the master controller gives feedback to the data storage units based on the information sent by the data storage units; the data storage units control the opening sequence of each intelligent switch based on the feedback of the master controller.

[0035] The intelligent control switch also includes a prompt unit that is individually connected to each switch. When the switches are connected, the prompt unit gives a prompt, and the prompt method includes but is not limited to an LED light, a buzzer, etc.

[0036] Furthermore, the control module includes setting a current limiting threshold, determining whether the instantaneous current exceeds the current limiting threshold, and if so, controlling the current limiting unit to limit the current output value; if not, controlling the load connection or disconnection with the current obtained by the current limiting unit according to the switch priority, and determining whether the instantaneous current is stably less than the current limiting threshold, and if so, slowly increasing the output current.

[0037] Furthermore, determining whether the instantaneous current exceeds the current limiting threshold includes: filtering the instantaneous current to obtain an instantaneous filtered current corresponding to the instantaneous current, obtaining the instantaneous filtered current peak value and counting it, limiting the current output value when the peak value exceeds the current limiting threshold, and clearing the peak value count and recalculating.

[0038] Specifically, the control module also includes setting a status flag for the hybrid energy storage module to characterize its status for easy identification and analysis. For example, when the hybrid energy storage module enters the current limiting state, the state flag is set to 1, and when the hybrid energy storage module enters the current increasing state, the state flag is set to 0. After the hybrid energy storage module enters the current limiting state, the output current is reduced by reducing its output voltage. According to the error between the instantaneous filter current and the current limiting threshold, the output given voltage of the hybrid energy storage module is reduced by the current limiting unit, and then the hybrid energy storage module is driven to generate the output given voltage, thereby reducing its output current; if the instantaneous current output by the hybrid energy storage module is less than or equal to the current limiting threshold, and the hybrid energy storage module is not in the current limiting state, it indicates that the instantaneous power-on current of the battery pack when powering on the electric device does not exceed the current limiting threshold that may threaten the electric device, and the hybrid energy storage module starts normally according to the required voltage of the electric device and does not enter the current limiting state; if the instantaneous filter current is less than or equal to the current limiting threshold, and the number of its current peaks reaches a certain number, it indicates that the output current of the hybrid energy storage module has stabilized below the current limiting threshold, and the output given voltage of the hybrid energy storage module is increased to the required voltage of the electric device to ensure the normal operation of the electric device.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control system suitable for instantaneous current control, characterized in that: It includes hybrid energy storage module, inverter module, voltage detection module, current detection module, intelligent switch module and control module. Hybrid energy storage module, used to release or store electric current; An inverter module, connected to the output end of the hybrid energy storage module, for converting direct current into alternating current; A voltage detection module is connected to the input end of the hybrid energy storage module and is used to detect the voltage of the hybrid energy storage module; A current detection module, connected to the first output terminal of the inverter module, for detecting the output current; An intelligent switch module, a first input terminal of which is connected to a first output terminal of the current detection unit, and includes a plurality of switches of different priorities connected in parallel, for controlling a load access sequence; The control module is connected to the input end of the hybrid energy storage module, the second output end of the voltage detection module, the second output end of the current detection unit and the second input end of the intelligent switch, and is used to determine whether the instantaneous current exceeds the threshold and perform corresponding operations.

2. A control system suitable for instantaneous current control according to claim 1, characterized in that: The hybrid energy storage module includes a battery group, a supercapacitor group and a current limiting unit, which sets the minimum voltage and maximum voltage of the battery group and the maximum voltage across the supercapacitor group.

3. A control system suitable for instantaneous current control according to claim 1, characterized in that: When it is detected that the voltage across the battery group is lower than the set minimum voltage, the supercapacitor group discharges; when the voltage across the battery group is higher than the set maximum voltage, the battery group and the supercapacitor group are controlled to be connected and the supercapacitor group is charged; when the voltage across the battery group is higher than the set maximum voltage and the voltage across the supercapacitor group is higher than the set maximum voltage, the system stops running.

4. A control system suitable for instantaneous current control according to claim 1, characterized in that: The intelligent control switch module also includes a switch master control unit, which is used to detect the rated power of the load connected through the switch in the current circuit.

5. A control system suitable for instantaneous current control according to claim 2, characterized in that: The control module includes setting a current limiting threshold, judging whether the instantaneous current exceeds the current limiting threshold, and if so, controlling the current limiting unit to limit the current output value. If not, the current obtained by the current limiting unit controls the load to be connected or disconnected according to the switch priority, and judging whether the instantaneous current is stably less than the current limiting threshold. If so, the output current is slowly increased.

6. A control system suitable for instantaneous current control according to claim 5, characterized in that: Determining whether the instantaneous current exceeds the current limiting threshold includes: filtering the instantaneous current to obtain an instantaneous filtered current corresponding to the instantaneous current, obtaining the instantaneous filtered current peak value and counting it, limiting the current output value when the peak value exceeds the current limiting threshold, and clearing the peak value count and recalculating.

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