CN210430926U - Current equalizing circuit for parallel power supply - Google Patents
Current equalizing circuit for parallel power supply Download PDFInfo
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- CN210430926U CN210430926U CN201921753100.6U CN201921753100U CN210430926U CN 210430926 U CN210430926 U CN 210430926U CN 201921753100 U CN201921753100 U CN 201921753100U CN 210430926 U CN210430926 U CN 210430926U
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- voltage regulator
- power supply
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Abstract
The utility model relates to a circuit flow equalizes for parallel power supply, parallel power supply include a plurality of parallelly connected miniwatt module power together, are provided with a set of circuit flow equalizes respectively corresponding to every miniwatt module power, and every group circuit flow equalizes includes DC-DC voltage regulator, sampling resistor and flow equalization controller, every miniwatt module power the output earlier with DC-DC voltage regulator links to each other, and DC-DC voltage regulator rear end exports after being connected with a sampling resistor, sampling resistor inserts flow equalization controller's signal input part, flow equalization controller's control output again with DC-DC voltage regulator links to each other, constitutes closed regulation's the circuit flow equalizes, and each group's flow equalizes the output connection of circuit and constitutes whole output together. The utility model discloses can be when satisfying the high-power requirement of load, guarantee electrical power generating system's job stabilization and reliable.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a circuit flow equalizes for parallel power supply.
Background
In the technical field of electronic circuits and the practical application of direct current power supply, the output parameters (such as voltage, current and power) of a single direct current power supply often cannot meet the requirements, and a direct current stabilized power supply meeting the parameter requirements has the processes of redevelopment, design and production, and the cost of the power supply must be increased, the delivery time is prolonged and the project progress is influenced. Therefore, in practice, a modular construction method is often adopted, a series of modular power supplies with certain specifications are adopted, and the purpose of expanding output voltage, output current and output power is achieved respectively according to a certain series connection or parallel connection mode.
The power supplies of the plurality of middle and small power modules are connected in parallel to share the output of high power to form a distributed power supply system, however, because the output voltages of the unit modules are not identical and the output impedances are different, if the unit modules are directly connected in parallel, the unit modules can cause the unbalanced load to cause the service life of some power supply modules to be shortened due to larger output current and even cause faults due to overcurrent, and therefore, current equalizing measures are required to be adopted to equalize the output current of each power supply module.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a circuit that flow equalizes for parallel power supply can be when satisfying the high-power requirement of load, guarantees electrical power generating system's job stabilization and reliable.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a current-sharing circuit for parallel power supply, parallel power supply include a plurality of parallelly connected miniwatt module power together, are provided with a set of circuit that flow equalizes respectively corresponding to every miniwatt module power, and every group current-sharing circuit includes DC-DC voltage regulator, sampling resistor and current-sharing controller, every miniwatt module power the output earlier with DC-DC voltage regulator links to each other, and DC-DC voltage regulator rear end exports after being connected with a sampling resistor, sampling resistor inserts current-sharing controller's signal input part, current-sharing controller's control output again with DC-DC voltage regulator links to each other, constitutes closed regulation's the circuit that flow equalizes, and each group current-sharing circuit's output links together and constitutes whole output.
Preferably, in each set of current equalizing circuit, a diode for filtering is further disposed at the rear end of the sampling resistor.
Preferably, the DC-DC voltage regulator adopts a voltage reduction conversion circuit formed by an LM22679 switching regulator.
Furthermore, the current-sharing controllers in each current-sharing circuit are connected through a control bus to form a cascaded current-sharing control network.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the utility model discloses a circuit flow equalizes for parallel power supply, carry out current collection to each power module through sampling resistance, combine the definite back of primary module, determine the proportional bus voltage that flow equalizes of anticipated output current, reverse carrying out voltage regulation control to DC-DC voltage regulator through cascaded flow-equalizing controller, the current output that increases self for the benchmark with the bus voltage that flow equalizes is in order to reach the balanced purpose of every module load, realize parallel power supply's the output of flow equalizing, improve parallel power supply's operational reliability.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic circuit diagram of a current sharing circuit for parallel power supplies according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment describes a current-sharing circuit for parallel power supplies, where a parallel power supply includes a plurality of small power module power supplies connected in parallel, and a set of current-sharing circuits is respectively disposed corresponding to each small power module power supply, as shown in fig. 1, each set of current-sharing circuit includes a DC-DC voltage regulator, a sampling resistor, and a current-sharing controller, an output terminal of each small power module power supply is connected to the DC-DC voltage regulator first, a rear terminal of the DC-DC voltage regulator is connected to a sampling resistor and then outputs the voltage, the sampling resistor is connected to a signal input terminal of the current-sharing controller, a control output terminal of the current-sharing controller is connected to the DC-DC voltage regulator to form a closed regulated current-sharing circuit, and outputs of each set of current-sharing circuits are connected together to form an integral output.
The DC-DC voltage regulator adopts a voltage reduction conversion circuit formed by an LM22679 switching regulator, and current-sharing controllers in all the current-sharing circuits are connected through a control bus to form a cascaded current-sharing control network.
The LM22679 switching regulator may use a minimum of external components to provide all the functions required to implement a high-efficiency, high-voltage buck regulator. This regulator is easy to use and integrates a 42VN channel MOSFET switch, providing up to 5A of load current, and is characterized by excellent line and load regulation and high efficiency (> 90%). Voltage mode control provides a shorter minimum on-time, thereby achieving the widest ratio between input and output voltages. Internal loop compensation means that the user does not have to undertake the tedious task of computing the loop compensation components. This kind of stabiliser is provided with two kinds of options of the fixed output of 5V and adjustable output voltage, the utility model discloses adjustable output voltage is adopted to the utility model circuit. A switching frequency of 500kHz makes the use of small external components possible and good transient response can be achieved. An adjustable soft start characteristic is provided by selecting a single external capacitor. In addition, a single external resistor may also be used to set the switch current limit, thereby optimizing the solution. The LM22679 device also has thermal cut-off and current limiting functions to prevent accidental overload of the device.
The current-sharing circuit for the parallel power supply of the embodiment collects current of each power supply module through the sampling resistor, determines current-sharing bus voltage in proportion to expected output current after the determination of the main module is combined, performs voltage regulation control on the DC-DC voltage regulator in a reverse direction through the cascaded current-sharing controller, increases current output of the DC-DC voltage regulator by taking the current-sharing bus voltage as a reference so as to achieve the purpose of load balancing of each module, achieves current-sharing output of the parallel power supply, and improves the working reliability of the parallel power supply.
In order to achieve stability of operation, a diode for filtering is further arranged at the rear end of the sampling resistor in each group of current equalizing circuits.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (4)
1. A current-sharing circuit for parallel power supplies comprises a plurality of small power module power supplies which are connected in parallel, and is characterized in that a group of current-sharing circuits are arranged corresponding to each small power module power supply respectively, each group of current-sharing circuits comprises a DC-DC voltage regulator, a sampling resistor and a current-sharing controller, the output end of each small power module power supply is connected with the DC-DC voltage regulator firstly, the rear end of the DC-DC voltage regulator is connected with one sampling resistor and then outputs, the sampling resistor is connected to the signal input end of the current-sharing controller, the control output end of the current-sharing controller is connected with the DC-DC voltage regulator to form a closed regulation current-sharing circuit, and the outputs of the current-sharing circuits are connected together to form integral output.
2. The current-sharing circuit for parallel power supplies of claim 1, wherein in each current-sharing circuit set, a diode for filtering is further disposed at the rear end of the sampling resistor.
3. The current sharing circuit for the parallel power supplies according to claim 1, wherein the DC-DC voltage regulator adopts a voltage reduction conversion circuit formed by an LM22679 switching regulator.
4. The current-sharing circuit for the parallel power supply according to any one of claims 1 to 3, wherein the current-sharing controllers in each current-sharing circuit are connected through a control bus to form a cascaded current-sharing control network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921753100.6U CN210430926U (en) | 2019-10-18 | 2019-10-18 | Current equalizing circuit for parallel power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921753100.6U CN210430926U (en) | 2019-10-18 | 2019-10-18 | Current equalizing circuit for parallel power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210430926U true CN210430926U (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921753100.6U Active CN210430926U (en) | 2019-10-18 | 2019-10-18 | Current equalizing circuit for parallel power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN210430926U (en) |
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2019
- 2019-10-18 CN CN201921753100.6U patent/CN210430926U/en active Active
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