CN214590609U - External parallel current-sharing device and external parallel current-sharing system of power module - Google Patents
External parallel current-sharing device and external parallel current-sharing system of power module Download PDFInfo
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Abstract
The utility model relates to a circuit control equipment technical field, concretely relates to power module's external parallelly connected flow straightener and external parallelly connected flow equalizing system, including two at least power module, an external parallelly connected flow straightener is connected to each power module, connects through the generating line that flow equalizes between external parallelly connected flow straightener's the current sampling module, and external parallelly connected flow straightener is including the current sampling module that connects gradually, difference amplification module, PI regulation control module, follow circuit module and photoelectric isolation regulating module. The utility model discloses power module's external parallelly connected flow straightener and external parallelly connected flow equalizing system, small, the structure is simple and easy, adopts the table to paste the encapsulation, facilitates the use, and the precision of flow equalizing can reach to be less than or equal to 3%, can realize N + 1's parallelly connected flow equalizing, has solved the problem that different producers, different model power module are parallelly connected between and flow equalize not good, has realized the parallelly connected flow equalizing between different producers, different model power module.
Description
Technical Field
The utility model relates to a circuit control equipment technical field, concretely relates to power module's external parallelly connected flow straightener and external parallelly connected flow equalizing system.
Background
With the continuous improvement of the functions of the airborne electronic system, the power requirement of the power supply is higher and higher, and in addition, the standardization and the generalization of the power supply module are proposed by the host, the maximum output power of a single power supply module cannot meet the power supply requirement of system equipment, and the parallel output of a plurality of power supply modules is a necessary trend. The direct parallel connection of a plurality of power supply modules can lead to the problems of uneven output power, large output voltage ripple and the like of the power supply modules due to different output voltages and inconsistent output impedance of the discrete modules, so that the reliability of the whole system is reduced, and the problem of uniform current is solved by the parallel connection output of the plurality of power supply modules.
At present, DC/DC converters below 300W in the domestic market have no active parallel current sharing function; the DC/DC converter with the power of more than 300W adopts a current equalizing line mode to equalize current, but is only limited to current equalization between converters of the same manufacturer and the same model, has special requirements on circuit board layout, wiring and the like, and has low practicability. Therefore, the parallel connection of the power supply modules of the existing airborne platform adopts a passive parallel current sharing technology (also called as an output impedance matching method), the output voltage of each set of product needs to be accurately adjusted, the debugging workload is large, the current sharing precision can only reach about 10% at most, and the power supply modules of different manufacturers cannot realize good current sharing due to the difference of the output impedance.
Therefore, the utility model discloses aim at solving the not good problem of parallelly connected output current-sharing precision between different power module, provide a power module's that can realize adjusting power module's the output external characteristics external parallel current rectifier and external parallel current-sharing system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art not enough, provide a power module's external parallelly connected flow straightener and external parallelly connected flow equalizing system, small, the structure is simple and easy, adopts the table to paste the encapsulation, facilitates the use, and the precision of flow equalizing can reach and is less than or equal to 3%, can realize the parallelly connected flow equalizing of N +1, has solved different producers, the parallelly connected not good problem of flow equalizing between different model power module, has realized the parallelly connected flow equalizing between different producers, different model power module.
The purpose of the utility model is realized through the following technical scheme:
an external parallel current sharing device of a power module comprises a current sampling module, a differential amplification module, a PI regulation control module, a following circuit module and a photoelectric isolation regulation module which are connected in sequence, wherein the current sampling module is used for collecting an output current signal of the power module, the current sampling module transmits the current signal to the corresponding differential amplification module through a first signal output end, and the current sampling module transmits the current signal to the differential amplification module of another external parallel current sharing device through a second signal output end; the differential amplification module receives an output signal corresponding to a first signal output end of the current sampling module through a first signal receiving end, receives an output signal of a second signal output end of another external parallel current sharing device current sampling module through a second signal receiving end, differentially amplifies an output current difference value of the power supply module and outputs a differential signal; the PI regulation control module is used for carrying out proportional amplification and integral regulation on the differential signal, and the following circuit module is used for carrying out output signal following on the PI regulation control module and outputting a following differential amplification signal; the photoelectric isolation adjusting module is connected with a voltage adjusting end of the power supply module and used for receiving the following differential amplification signal and adjusting the output voltage of the power supply module.
The utility model provides an external parallelly connected current-sharing system of power module, includes two at least power modules, and each power module connects a foretell external parallelly connected current-sharing device of aforesaid, connects through the bus that flow equalizes between external parallelly connected current-sharing device's the current sampling module. In the actual use process, the power modules work in parallel, each power module is connected with an external parallel current-sharing device, the current sampling modules of the external parallel current-sharing devices are connected through a current-sharing bus, the current sampling modules are used for collecting output current signals of the power modules, then the current sampling modules transmit the current signals to corresponding differential amplification modules through first signal output ends, the collected output current signals are converted into isolation voltage signals, and the second signal output ends of the current sampling modules transmit the isolation voltage signals to the current-sharing bus through isolation diodes; the differential amplification module receives an output signal corresponding to a first signal output end of the current sampling module through a first signal receiving end, simultaneously receives isolation voltage signal output signals corresponding to other power modules on the current-sharing bus through a second signal receiving end, and then differentially amplifies the difference value of the output current of each power module of the differential amplification module to output a differential signal; the difference signal is subjected to proportional amplification and integral adjustment through the PI regulation control module, and the following circuit module is used for following the output signal of the PI regulation control module, so that the noise suppression capability of the system is improved, and a following difference amplification signal is output; the photoelectric isolation adjusting module receives the following differential amplification signals and adjusts the output voltage of the corresponding power supply module according to the following differential amplification signals, so that the output external characteristics of each power supply module tend to be consistent, and current balance is realized.
Furthermore, the power module is a power module with adjustable output voltage.
Furthermore, the current sampling module is used for converting the acquired output current signal into an isolation voltage signal, and the second signal output end of the current sampling module transmits the isolation voltage signal to the current-sharing bus through the isolation diode.
Furthermore, the differential amplification module is connected with the current-sharing bus through a second signal receiving end.
Further, the power modules are connected in parallel.
Furthermore, the power supply module is connected with the corresponding current sampling module of the external parallel current sharing device.
Furthermore, the photoelectric isolation adjusting module is connected with a voltage adjusting end of the power supply module through an optical coupler secondary resistor.
Furthermore, the current sampling module is used for converting the acquired output current signals into isolated voltage signals, and then the isolated voltage signals are connected together through an isolation diode to form a current-sharing bus.
The utility model has the advantages that: the utility model discloses power module's external parallelly connected flow straightener and external parallelly connected flow equalizing system, small, the structure is simple and easy, adopts the table to paste the encapsulation, facilitates the use, and the precision of flow equalizing can reach to be less than or equal to 3%, can realize N + 1's parallelly connected flow equalizing, has solved the problem that different producers, different model power module are parallelly connected between and flow equalize not good, has realized the parallelly connected flow equalizing between different producers, different model power module.
Drawings
FIG. 1 is a schematic diagram of the module connection of the external parallel flow straightener of the present invention;
FIG. 2 is a schematic circuit diagram of the external parallel current sharing device of the present invention;
FIG. 3 is an enlarged view of a portion of the current sampling block of FIG. 2;
FIG. 4 is a partial enlarged view of the differential amplification block and the PI regulation control block of FIG. 2;
FIG. 5 is an enlarged view of a portion of the following circuit block of FIG. 2;
FIG. 6 is an enlarged view of a portion of the optoelectronic isolation tuning module of FIG. 2;
FIG. 7 is a schematic diagram of a module connection of a parallel current sharing system with an external power module;
in the figure, 1, a current sampling module; 2. a differential amplification module; 3. a PI regulation control module; 4. a follower circuit module; 5. a photoelectric isolation adjustment module; 6. and a power supply module.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
As shown in fig. 1, an external parallel current sharing device of a power module is characterized by comprising a current sampling module 1, a differential amplification module 2, a PI regulation control module 3, a follower circuit module 4 and a photoelectric isolation regulation module 5 which are connected in sequence, wherein the current sampling module 1 is used for collecting an output current signal of the power module 6, the current sampling module 1 transmits the current signal to the corresponding differential amplification module 2 through a first signal output end, and the current sampling module 1 transmits the current signal to the differential amplification module 2 of another external parallel current sharing device through a second signal output end; the differential amplification module 2 receives an output signal corresponding to a first signal output end of the current sampling module 1 through a first signal receiving end, the differential amplification module 2 receives an output signal of a second signal output end of another external parallel current sharing device current sampling module 1 through a second signal receiving end, and performs differential amplification on an output current difference value of the power supply module 6 to output a differential signal; the PI regulation control module 3 is used for carrying out proportional amplification and integral regulation on the differential signal, and the following circuit module 4 is used for carrying out output signal following on the PI regulation control module 3 and outputting a following differential amplification signal; the photoelectric isolation adjusting module 5 is connected with a voltage adjusting end of the power module 6, and the photoelectric isolation adjusting module 5 is used for receiving the following differential amplification signal and adjusting the output voltage of the power module 6.
Specifically, the external parallel current sharing device has a circuit diagram as shown in fig. 2 to 6, where N1 is a current sampling chip, and converts the output current of the power supply module into a voltage signal (DL), which is completely isolated from the output of the power supply module and sent to a current sharing bus (Share +) through an isolating diode V1; the operational amplifiers N2A, N2B and N3A form a triple operational amplifier, and the resistors R1, R4, C5 and C6 form a PI control loop, so that the PI control loop is used for amplifying the difference value of the output currents among the 2 power supply modules 6 and controlling and adjusting the loop; N3B is a follower circuit for improving the noise suppression capability of the circuit; n4 is the optoelectronic isolation regulator circuit, the output signal of N3B drives opto-coupler N4, makes the secondary of N4 be in stable impedance value, inserts power module's output voltage regulation end (Trim), adjusts power module output voltage.
An external parallel current-sharing system of power modules is shown in fig. 7 and comprises at least two power modules 6, wherein each power module 6 is connected with one external parallel current-sharing device, and current sampling modules 1 of the external parallel current-sharing devices are connected through a current-sharing bus. In the actual use process, the power modules 6 work in parallel, each power module 6 is connected with an external parallel current-sharing device, the current sampling modules 1 of the external parallel current-sharing devices are connected through a current-sharing bus, the current sampling modules 1 are used for collecting output current signals of the power modules 6, then the current sampling modules 1 transmit the current signals to the corresponding differential amplification modules 2 through first signal output ends, the collected output current signals are converted into isolation voltage signals, and the second signal output ends of the current sampling modules 1 transmit the isolation voltage signals to the current-sharing bus through isolation diodes; the differential amplification module 2 receives an output signal corresponding to a first signal output end of the current sampling module 1 through a first signal receiving end, meanwhile, the differential amplification module 2 receives an isolation voltage signal output signal corresponding to other power modules 6 on the current-sharing bus through a second signal receiving end, and then the differential amplification module 2 differentially amplifies the difference value of the output currents of the power modules 6 and outputs a differential signal; the difference signal is subjected to proportional amplification and integral adjustment through the PI regulation control module 3, and the following circuit module 4 is used for following the output signal of the PI regulation control module 3, so that the noise suppression capability of the system is improved, and a following difference amplification signal is output; the photoelectric isolation adjusting module 5 receives the following differential amplification signal and adjusts the output voltage of the corresponding power module 6 according to the following differential amplification signal, so that the output external characteristics of each power module 6 tend to be consistent, and current balance is realized.
Specifically, the power module 6 is a power module 6 with adjustable output voltage.
Specifically, the current sampling module 1 is configured to convert the acquired output current signal into an isolation voltage signal, and the second signal output end of the current sampling module 1 transmits the isolation voltage signal to the current-sharing bus through the isolation diode.
Specifically, the differential amplification module 2 is connected with the current-sharing bus through a second signal receiving end.
Specifically, the power modules 6 are connected in parallel.
Specifically, the power module 6 is connected with the corresponding current sampling module 1 of the external parallel current sharing device.
Specifically, the optoelectronic isolation adjustment module 5 is connected with a voltage adjustment end of the power module 6 through an optocoupler secondary resistor.
Specifically, the current sampling module 1 is configured to convert the acquired output current signal into an isolation voltage signal, and then connect the isolation voltage signal with the isolation diode to form a current-sharing bus.
Specifically, the external parallel current sharing system of the power supply module comprises two power supply modules 6.
When the current-sharing circuit is used, 2 power modules 6 are taken as an example for outputting parallel current sharing, the output anode of each power module 6 is respectively connected with an external parallel current-sharing device in series, the output current of each power module 6 is sampled, compared, amplified and controlled, and the output voltage of each power module 6 is regulated through optical coupling isolation; collected current signals (DL signals in fig. 2) output by each power module 6 are transmitted to a Share + of a current sharing bus through a diode V1 shown in fig. 2, and compared with a DL signal of the other path, if the DL voltage is less than the Share + voltage, N3B in fig. 2 outputs a high level signal to drive an optocoupler N4, and the output voltage of the power module 6 with a smaller output current is adjusted to gradually increase the output current to be consistent with the output current of the other power module 6, so that current balance is realized.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (7)
1. An external parallel current sharing device of a power module is characterized by comprising a current sampling module, a differential amplification module, a PI (proportional integral) regulation control module, a follower circuit module and a photoelectric isolation regulation module which are sequentially connected, wherein the current sampling module is used for collecting an output current signal of the power module, the current sampling module transmits the current signal to the corresponding differential amplification module through a first signal output end, and the current sampling module transmits the current signal to the differential amplification module of another external parallel current sharing device through a second signal output end; the differential amplification module receives an output signal corresponding to a first signal output end of the current sampling module through a first signal receiving end, receives an output signal of a second signal output end of another external parallel current sharing device current sampling module through a second signal receiving end, differentially amplifies an output current difference value of the power supply module and outputs a differential signal; the PI regulation control module is used for carrying out proportional amplification and integral regulation on the differential signal, and the following circuit module is used for carrying out output signal following on the PI regulation control module and outputting a following differential amplification signal; the photoelectric isolation adjusting module is connected with a voltage adjusting end of the power supply module and used for receiving the following differential amplification signal and adjusting the output voltage of the power supply module.
2. An external parallel current-sharing system for power modules is characterized by comprising at least two power modules, each power module is connected with one external parallel current-sharing device according to claim 1, and current sampling modules of the external parallel current-sharing devices are connected through a current-sharing bus.
3. The external parallel current sharing system of claim 2, wherein the power module is a power module with adjustable output voltage.
4. The external parallel current sharing system of claim 2, wherein the current sampling module is configured to convert the collected output current signal into an isolated voltage signal, and the isolated voltage signal is transmitted from the second signal output terminal of the current sampling module to the current sharing bus via the isolation diode.
5. The external parallel current sharing system for power modules according to claim 2, wherein the differential amplification module is connected to the current sharing bus through the second signal receiving terminal.
6. The external parallel current sharing system for power modules according to claim 2, wherein the power modules are connected in parallel.
7. The external parallel current sharing system for power modules according to claim 2, wherein the power modules are connected to the current sampling modules of the corresponding external parallel current sharing devices.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121030142.4U CN214590609U (en) | 2021-05-14 | 2021-05-14 | External parallel current-sharing device and external parallel current-sharing system of power module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121030142.4U CN214590609U (en) | 2021-05-14 | 2021-05-14 | External parallel current-sharing device and external parallel current-sharing system of power module |
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| Publication Number | Publication Date |
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| CN214590609U true CN214590609U (en) | 2021-11-02 |
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| CN202121030142.4U Active CN214590609U (en) | 2021-05-14 | 2021-05-14 | External parallel current-sharing device and external parallel current-sharing system of power module |
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