CN215954178U - Current equalizing circuit of parallel power supply - Google Patents
Current equalizing circuit of parallel power supply Download PDFInfo
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- CN215954178U CN215954178U CN202122261597.3U CN202122261597U CN215954178U CN 215954178 U CN215954178 U CN 215954178U CN 202122261597 U CN202122261597 U CN 202122261597U CN 215954178 U CN215954178 U CN 215954178U
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Abstract
The utility model discloses a current-sharing circuit of a parallel power supply, which comprises a current acquisition module N1, an operational amplifier N2 and an optical coupler N3, wherein a sampling current input end and a sampling current output end of the current acquisition module N1 are connected with an external current signal, a power supply is connected with an auxiliary source, a voltage output end is connected with a non-inverting input end of an operational amplifier N2 through a resistor R3, the non-inverting input end of the operational amplifier N2 is connected with a diode D1 and a resistor R1 which are connected in series, and the anode of a diode V1 is connected with the voltage output end of the current acquisition module N1; the non-inverting input end of the operational amplifier N2 is grounded through a resistor R4, a resistor R2 is connected between the inverting input end and the output end, and the output end is connected with the anode of the input end of the optocoupler N3; the negative pole of the input end of the optocoupler N3 is grounded, and the positive pole and the negative pole of the output end are respectively connected with a power supply end and a voltage fine-tuning end of an external power supply. The utility model can meet the parallel requirement of a plurality of power supply modules, has the current sharing precision of less than or equal to 5 percent, and has wide application prospect in the field of power supply current sharing application.
Description
Technical Field
The utility model relates to the technical field of power supply current sharing, in particular to a current sharing circuit of a parallel power supply.
Background
With the development and application of power electronic technology, the requirement of a power supply system on a high-power supply system is higher and higher, in the actual application process, the output power and reliability of a single direct-current power supply cannot meet the requirement of a user, and once the single power supply fails, the power supply system is paralyzed and cannot run. The parallel operation of a plurality of power supply modules can meet different output power requirements, and the method is an effective method for modularization and high power of power supply products. Because the output voltages of the modules of the parallel units are not identical and the output impedances are not identical, if the modules are directly connected in parallel, unbalanced loads can be borne, so that the service life of some power modules is shortened due to large output current, and even the power modules have faults due to overcurrent, and therefore, current sharing measures must be taken to balance the output currents of the power modules connected in parallel.
The current-sharing precision of the current-sharing circuit is one of important performance indexes, and part of electronic systems have higher requirements on the current-sharing precision of the current-sharing circuit. The traditional current equalizing circuit has a complex circuit structure and low current equalizing precision.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a high-precision current equalizing circuit for parallel power supplies, which is applied to parallel connection of multiple power supplies and meets the parallel connection requirement of multiple power supply modules.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a current equalizing circuit of a parallel power supply comprises a current acquisition module N1, an operational amplifier N2 and an optical coupler N3, wherein a sampling current input end and a sampling current output end of the current acquisition module N1 are connected with an external current signal, a power supply is connected with an auxiliary source, a voltage output end is connected with a non-inverting input end of the operational amplifier N2 through a resistor R3, the non-inverting input end of the operational amplifier N2 is connected with a diode D1 and a resistor R1 which are connected in series, and the anode of a diode V1 is connected with the voltage output end of the current acquisition module N1; the non-inverting input end of the operational amplifier N2 is grounded through a resistor R4, a resistor R2 is connected between the inverting input end and the output end, and the output end is connected with the anode of the input end of the optocoupler N3; the negative pole of the input end of the optocoupler N3 is grounded, and the positive pole and the negative pole of the output end are respectively connected with a power supply end and a voltage fine-tuning end of an external power supply.
Further, the auxiliary source is a 5V dc power supply.
Further, the current collection module N1 adopts a current sensor with model number ACS724LLCTR-50 AB-T.
Due to the adoption of the technical scheme, the utility model has the following advantages:
the current-sharing circuit of the parallel power supply has the advantages of simple structure, reasonable and reliable design and adjustable power supply voltage, can meet the parallel requirement of a plurality of power supply modules, has the current-sharing precision of less than or equal to 5 percent, can reach the maximum sampling current of 50A, and has wide application prospect in the field of power supply current-sharing application.
Drawings
Fig. 1 is a schematic diagram of a current sharing circuit of a parallel power supply of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the current equalizing circuit of the parallel power supply includes a current collecting module N1, an operational amplifier N2, and an optical coupler N3, wherein a sampling current input terminal (pin 1, 2) and a sampling current output terminal (pin 3, 4) of the current collecting module N1 are connected to an external current signal, a power supply terminal (pin 8) is connected to an auxiliary source VCC, the auxiliary source is a 5V dc power supply, a capacitor C1 is connected between an external capacitor terminal FILTER (pin 6) and a signal ground GND (pin 5), the signal ground GND (pin 5) is grounded, a voltage output terminal (pin 7) is connected to a non-inverting input terminal of the operational amplifier N2 via a resistor R3, and is connected to an inverting input terminal of the operational amplifier N2 via a series-connected diode D1 and a resistor R1, and an anode of the diode V1 is connected to a voltage output terminal of the current collecting module N1; the non-inverting input end of the operational amplifier N2 is grounded through a resistor R4, a resistor R2 is connected between the inverting input end and the output end, and the output end is connected with the anode of the input end of the optocoupler N3; the negative electrode of the input end of the optocoupler N3 is grounded, and the positive electrode and the negative electrode of the output end are respectively connected with a power supply end (+ S) and a voltage fine-tuning end (Trim) of an external power supply.
The maximum collecting current of the current collecting module N1 is 50A.
The current acquisition module N1 adopts a current sensor with the model number of ACS724LLCTR-50 AB-T.
The model of the operational amplifier N2 is TLV2372 IDR.
The model number of the optical coupler N3 is PS 2703-1-V-A.
The current equalizing circuit of the parallel power supply of the utility model has the working principle that: when the current acquisition module N1 receives 5V direct current voltage supplied by an auxiliary source, the current acquisition module N1 starts to acquire current signals, the current acquisition module N1 converts the acquired current signals into voltage signals and outputs the voltage signals to the operational amplifier N2, then the voltage signals are amplified through the operational amplifier N2, a linear working area of the optocoupler N3 is controlled, the positive electrode and the negative electrode of the output end of the optocoupler N3 are connected with a power supply end (+ S) of an external power supply and a voltage fine adjustment end (Trim), and current sharing among module power supplies is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A current equalizing circuit of parallel power supply is characterized in that: the current acquisition module comprises a current acquisition module N1, an operational amplifier N2 and an optocoupler N3, wherein a sampling current input end and a sampling current output end of the current acquisition module N1 are connected with an external current signal, a power supply is connected with an auxiliary source, a voltage output end is connected with a non-inverting input end of the operational amplifier N2 through a resistor R3, the non-inverting input end of the operational amplifier N2 is connected with a diode D1 and a resistor R1 which are connected in series, and the anode of a diode V1 is connected with the voltage output end of the current acquisition module N1; the non-inverting input end of the operational amplifier N2 is grounded through a resistor R4, a resistor R2 is connected between the inverting input end and the output end, and the output end is connected with the anode of the input end of the optocoupler N3; the negative pole of the input end of the optocoupler N3 is grounded, and the positive pole and the negative pole of the output end are respectively connected with a power supply end and a voltage fine-tuning end of an external power supply.
2. The current sharing circuit of the parallel power supply as claimed in claim 1, wherein: the auxiliary source is a 5V direct current power supply.
3. The current sharing circuit of the parallel power supply as claimed in claim 1, wherein: the current acquisition module N1 adopts a current sensor with the model number of ACS724LLCTR-50 AB-T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122261597.3U CN215954178U (en) | 2021-09-17 | 2021-09-17 | Current equalizing circuit of parallel power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122261597.3U CN215954178U (en) | 2021-09-17 | 2021-09-17 | Current equalizing circuit of parallel power supply |
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| CN215954178U true CN215954178U (en) | 2022-03-04 |
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| CN202122261597.3U Active CN215954178U (en) | 2021-09-17 | 2021-09-17 | Current equalizing circuit of parallel power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147951A (en) * | 2023-06-27 | 2023-12-01 | 深圳达德航空科技有限公司 | Output current sampling method for multi-module parallel power supply device |
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2021
- 2021-09-17 CN CN202122261597.3U patent/CN215954178U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147951A (en) * | 2023-06-27 | 2023-12-01 | 深圳达德航空科技有限公司 | Output current sampling method for multi-module parallel power supply device |
| CN117147951B (en) * | 2023-06-27 | 2024-04-05 | 深圳达德航空科技有限公司 | Output current sampling method for multi-module parallel power supply device |
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