CN212112262U - Heavy current constant current source structure - Google Patents
Heavy current constant current source structure Download PDFInfo
- Publication number
- CN212112262U CN212112262U CN201922454346.XU CN201922454346U CN212112262U CN 212112262 U CN212112262 U CN 212112262U CN 201922454346 U CN201922454346 U CN 201922454346U CN 212112262 U CN212112262 U CN 212112262U
- Authority
- CN
- China
- Prior art keywords
- current source
- constant current
- output
- current
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Voltage And Current In General (AREA)
Abstract
The utility model provides a heavy current constant current source structure, which is used for realizing heavy current accurate output, the scheme comprises an input module, a control adjustment module and an output module, wherein the input module comprises an alternating current power supply and a three-phase transformer; the control adjustment module comprises a control center, and a touch screen, a low-precision constant current source CH1 and a high-precision constant current source CH2 which are respectively communicated with the control center; the output module comprises an output positive end and an output negative end; the three-phase transformer gets power from an alternating current power supply and respectively supplies power to the constant current source CH1 and the constant current source CH 2; the constant current source device further comprises a current sensor electrically connected with the control center, the positive output end of the constant current source CH1 is connected with the current sensor in series and then is connected with the positive output end of the constant current source CH2 to be connected with the positive output end, and the negative output ends of the constant current source CH1 and the constant current source CH2 are connected with the negative output end to be connected with the negative output end. The utility model discloses a heavy current constant current source structure can realize the accurate output of heavy current.
Description
Technical Field
The utility model relates to an adjust the technical field of heavy current constant current, especially relate to a heavy current constant current source structure.
Background
The inventor invents a current-sharing control circuit and a current-sharing control method for double current-sharing buses of a parallel direct-current switching power supply, and provides four current-sharing control methods based on an intelligent Controller (CPU). In the power parallel system, as each power module applies an intelligent Controller (CPU) and a software programming technology, and a hardware circuit for obtaining a maximum current value and a maximum current difference is complex, the system cost is greatly increased. The four current sharing control methods proposed simultaneously also have the following defects:
the minimum current sharing control method comprises the following steps: the intelligent controller of each power module calculates the minimum output current in the power module according to signals (the maximum current value and the maximum current difference value) on the first current-sharing bus and the second current-sharing bus transmitted by the A/D conversion circuit. The minimum output current is taken as a reference, except for an actual minimum output current power module, the output currents of other power modules are all regulated downwards, under the condition that the load is unchanged, the reduction of the output currents of a plurality of power modules is inevitably greater than the increase of the output current of a single power module, and as a result, the output voltage of the power module is lower than the rated voltage, and 'under voltage' is generated.
The minimum current sharing control method is simplified: the intelligent Controller (CPU) compares the acquired self output current signal with the maximum current signal, judges whether the power module with the maximum output current is the power module with the output current as the maximum value and only adjusts the power module with the minimum output current as the reference, other power supplies do not carry out current sharing control, along with the reduction of the output current of the power module with the maximum output current, under the condition that the load is unchanged, the output current of other direct current switch power supplies rises, the output current of the other power supply inevitably becomes the maximum value, the new power module with the maximum output current starts to adjust with the minimum output current as the reference, and the original power module with the maximum output current quits the adjustment. Theoretically, the method only adjusts one power module at a time, so that the adjusting frequency of the power supply of the parallel system is low, but the output current of the power module with the maximum output current is reduced, so that the output current of other power modules is increased, and the adjusting frequency of the power supply is increased, so that the dynamic response of the system is influenced; meanwhile, the method does not consider the condition that the output currents of a plurality of power modules are the maximum values, when the output currents of the power modules with the maximum output currents are close to the minimum current value, the output currents of other direct-current switching power supplies are increased more, the power supply adjusting frequency is larger, and the dynamic response of the system is influenced.
The intermediate current sharing control method comprises the following steps: and an intelligent Controller (CPU) of each power supply module calculates an intermediate current value according to the maximum current value and the maximum current difference value, and regulates the output current by taking the intermediate current value as a reference. The power modules having output currents greater than the intermediate current value all reduce their output currents, while the power modules having output currents less than the intermediate current value all increase their output currents. The method can cause all power modules to participate in regulation, so that the regulation frequency of the system is high, and meanwhile, the middle current value is used as a reference, and the average current value is not used as the reference, so that the regulation frequency of the system is higher, and the dynamic response of the system is further influenced.
Fourthly, simplifying the intermediate current sharing control method: the intelligent Controller (CPU) of each power module can determine whether it is the maximum current of the maximum or minimum output current by comparing the collected self current signal with the maximum current signal and the minimum current signal. The two output currents of the maximum output current and the minimum output current are adjusted by taking the intermediate current value as a reference, other output currents are not subjected to current sharing control, and along with the reduction of the maximum current value and the increase of the minimum current value, other power supply modules are inevitably provided to replace the original maximum output current power supply module and the original minimum output current power supply module, so that the output currents of the power supply modules are adjusted. Theoretically, the method only adjusts two power supply modules at a time, so that the adjusting frequency of the parallel system power supply is relatively low, but the decrease of the output current of the maximum output current power supply module and the increase of the output current of the minimum output current power supply module take the intermediate current value as the reference, and do not take the average current value as the reference, so that the adjusting frequency of the power supply is increased on the contrary, and the dynamic response of the system is influenced; meanwhile, the method does not consider the condition that the output currents of the power modules are the maximum value and the minimum value, when the output current increment of the power modules with the maximum output currents is not equal to the output current decrement of the power modules with the minimum output currents, the power parallel system is not overvoltage or undervoltage, the power output performance is further influenced, the adjusting frequency is increased, and the dynamic response of the system is influenced.
The prior art has the following disadvantages:
the current value output by the large-current system is reduced because the system is loaded with a plurality of components which generate power consumption, so that the precision of the current output by the system is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at designing a hardware architecture of heavy current constant current source structure, treat the software personnel to wherein control module's programming back, this heavy current constant current source structure can realize the accurate output of heavy current.
In order to achieve the above-mentioned beneficial effects, the present invention comprises:
provides a heavy current constant current source structure, which comprises an input module, a control and adjustment module and an output module,
the input module comprises an alternating current power supply and a three-phase transformer;
the control adjustment module comprises a control center, and a touch screen, a low-precision constant current source CH1 and a high-precision constant current source CH2 which are respectively communicated with the control center;
the output module comprises an output positive end and an output negative end;
the three-phase transformer gets power from an alternating current power supply and respectively supplies power to the constant current source CH1 and the constant current source CH 2;
the constant current source device further comprises a current sensor electrically connected with the control center, the positive output end of the constant current source CH1 is connected with the current sensor in series and then is connected with the positive output end of the constant current source CH2 to be connected with the positive output end, and the negative output ends of the constant current source CH1 and the constant current source CH2 are connected with the negative output end to be connected with the negative output end.
Further, the sampling resistor of the constant current source CH2 is made of manganese-copper alloy.
Further, the current sensor is IT-400S using Lyme.
Further, the output accuracy of the constant current source CH1 is 0.1%, and the output accuracy of the constant current source CH2 is 0.01%.
The utility model discloses a design a heavy current constant current source structure, treat that the software personnel is to control module's programming back wherein, software system is according to the demand current value P that the user input, and control slightly is less than demand current value P's electric current and exports through constant current source CH1, current sensor detects the actual current value X1 of constant current source CH1 output, and actual current value X1 feeds back software system, and software system operation reachs X2, and software system control X2's electric current exports through constant current source CH2, constant current source CH1 and constant current source CH2 parallel output. The utility model discloses have the advantage that reduces the current output precision, make the system can accurately export the current value that the user expected.
Drawings
Fig. 1 is a system block diagram of a large-current constant-current source structure in embodiment 1 of the present invention;
fig. 2 is a system block diagram of a large-current constant-current source structure in embodiment 2 of the present invention.
Detailed Description
The invention will be further described with reference to the following examples.
Example 1
The large-current constant-current source structure shown in fig. 1 comprises an input module, a control adjustment module and an output module, wherein the input module comprises an alternating-current power supply and a three-phase transformer; the control adjustment module comprises a touch screen, a control center, a constant current source CH1 with the output precision reaching 0.1% and a constant current source CH2 with the output precision reaching 0.01%; the output module of the current sensor comprises an output positive end and an output negative end;
the three-phase transformer gets electricity from an alternating current power supply, two windings which are respectively connected in a star connection way and a delta connection way are arranged on the secondary side of the three-phase transformer, the two windings are respectively converted into direct current through a rectifying and filtering module and then are converged into one path, and the direct current is used for respectively supplying power to a constant current source CH1 and a constant current source CH 2;
the control center is a logic processor which is communicated with the touch screen through RS485 on one hand and is respectively communicated with the constant current source CH1 and the constant current source CH2 through a CAN bus on the other hand;
the positive output end of the constant current source CH1 is connected with the current sensor in series and then is connected with the positive output end of the constant current source CH2 to be connected with the positive output end, and the negative output ends of the constant current source CH1 and the constant current source CH2 are connected with the negative output end.
The sensor adopts the IT-400S of Lyme, and the acquisition precision is 0.0044 percent.
When the device is used, a user inputs a required current value P of 300A to a control center through a touch screen, after the control center receives the required current value P, the constant current source CH1 is controlled to roughly adjust the output current of 300-2 of 298A (2 is a coefficient and needs to be adjusted actually), then a current sensor is used for collecting an actual current value X1 output by the constant current source CH1, X2 is obtained through P-X1, the constant current source CH2 is controlled to output X2, and the constant current source CH2 adopts a high-precision small-current control mode to perform fine adjustment, so that the output current P can achieve high precision (0.01%) and the system cost is reduced.
Furthermore, after the constant current source CH2 is purchased, the manganin alloy is used to replace the internal sampling resistor, i.e. the manganin alloy is used as a new sampling resistor, and because the manganin alloy has the advantage of small temperature drift, the output accuracy of the current output by the constant current source CH2 can be further improved.
Example 2
As shown in fig. 2, based on embodiment 1, a constant current source CH1 with an output accuracy of 0.1% and a constant current source CH2 with an output accuracy of 0.01% are changed to 10 constant current sources CH with an accuracy of 0.01%, and these constant current sources CH take electricity from a three-phase transformer, and their output terminals are connected in parallel.
When the constant current source device is used, a user inputs a required current value P which is 300A through the touch screen, the control center controls 10 constant current sources CH to perform current sharing output according to the required current value, namely each constant current source CH outputs 30A, high-precision output can be achieved, the fact that the load of each constant current source CH is not strong is guaranteed, and the defect that the cost is high is overcome.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1. The utility model provides a heavy current constant current source structure, includes input module, control adjustment module, output module, its characterized in that:
the input module comprises an alternating current power supply and a three-phase transformer;
the control adjustment module comprises a control center, and a touch screen, a low-precision constant current source CH1 and a high-precision constant current source CH2 which are respectively communicated with the control center;
the output module comprises an output positive end and an output negative end;
the three-phase transformer gets power from an alternating current power supply and respectively supplies power to the constant current source CH1 and the constant current source CH 2;
the constant current source device further comprises a current sensor electrically connected with the control center, the positive output end of the constant current source CH1 is connected with the current sensor in series and then is connected with the positive output end of the constant current source CH2 to be connected with the positive output end, and the negative output ends of the constant current source CH1 and the constant current source CH2 are connected with the negative output end to be connected with the negative output end.
2. The high current constant current source structure of claim 1, wherein: the sampling resistor of the constant current source CH2 is made of manganese-copper alloy.
3. The high current constant current source structure of claim 1, wherein: the current sensor is IT-400S adopting Lyme.
4. The high current constant current source structure of claim 1, wherein: the output accuracy of the constant current source CH1 is 0.1%, and the output accuracy of the constant current source CH2 is 0.01%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922454346.XU CN212112262U (en) | 2019-12-30 | 2019-12-30 | Heavy current constant current source structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922454346.XU CN212112262U (en) | 2019-12-30 | 2019-12-30 | Heavy current constant current source structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212112262U true CN212112262U (en) | 2020-12-08 |
Family
ID=73623853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922454346.XU Active CN212112262U (en) | 2019-12-30 | 2019-12-30 | Heavy current constant current source structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212112262U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176517A (en) * | 2021-04-15 | 2021-07-27 | 武汉励行科技有限公司 | Micro-current compensation method and system for precise control |
-
2019
- 2019-12-30 CN CN201922454346.XU patent/CN212112262U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176517A (en) * | 2021-04-15 | 2021-07-27 | 武汉励行科技有限公司 | Micro-current compensation method and system for precise control |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105990999A (en) | Power supply device and control method thereof | |
| CN110137992B (en) | Island direct current micro-grid coordinated stable operation control method | |
| CN112366970B (en) | Inversion system, inversion system control method and parallel inversion system | |
| CN103606932A (en) | Load-related automatic control method of low-voltage dynamic reactive compensation capacitor | |
| US11515711B2 (en) | Grid interconnection device and server | |
| CN113452074A (en) | Photovoltaic system and control method | |
| CN212112262U (en) | Heavy current constant current source structure | |
| CN110149067A (en) | The PI partition control method of inverter system | |
| CN102156500B (en) | Adjusting method for stabilizing current of parallel direct current resource | |
| CN111007911A (en) | Large-current constant-current source scheme | |
| CN108054747B (en) | Parallel control method of direct current converter and direct current micro-grid | |
| CN105490344B (en) | Charging electric vehicle current control method and its control system | |
| CN102279333A (en) | DC constant current testing device for low-voltage electrical apparatus | |
| US20220416546A1 (en) | Photovoltaic system and control method | |
| CN110442177A (en) | A kind of power control system | |
| KR101905586B1 (en) | Apparatus of tracking maximum power | |
| CN111865085B (en) | Control method and control device of combined isolation converter | |
| CN115693637A (en) | Direct-current power supply grid-connected device, system and method | |
| CN209982350U (en) | Power supply circuit and electric energy meter | |
| CN212675029U (en) | Power prediction device for low-voltage water resistance | |
| CN113258636A (en) | Frequency division-based self-adaptive feedforward compensation method and controller for full-active composite energy storage system | |
| CN107728694B (en) | Power supply device and current equalizing method thereof | |
| CN108983862B (en) | Maximum power point tracking method | |
| CN109348603A (en) | The fast and stable constant source flowing system that double lamp failure diagnosis are automatically switched | |
| CN109980961B (en) | Current equalizing method of multi-path parallel Boost type inversion module and inversion module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |