CN210958153U - Novel passive current-sharing line - Google Patents
Novel passive current-sharing line Download PDFInfo
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- CN210958153U CN210958153U CN201922333242.3U CN201922333242U CN210958153U CN 210958153 U CN210958153 U CN 210958153U CN 201922333242 U CN201922333242 U CN 201922333242U CN 210958153 U CN210958153 U CN 210958153U
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Abstract
The utility model discloses a novel passive current-sharing circuit, which belongs to the field of switching power supplies and comprises a power supply voltage input end VO, an electronic switching element Q2, a voltage-stabilizing resistor R5, an NPN triode Q1, a bias resistor R4, a voltage-stabilizing diode ZD1, a precise voltage-stabilizing source A1, a power supply resistor R3, a second sampling resistor R2, a first sampling resistor R1 and a power supply voltage output end VOUT; the output end of a power supply voltage input end VO is electrically connected with the input end of an electronic switching element Q2, the control end of an electronic switching element Q2 is electrically connected with the input end of a power supply voltage output end VOUT, and the output end of an electronic switching element Q2 is electrically connected with the input end of an NPN triode Q1 and the input end of a voltage stabilizing resistor R5 respectively; the output end of the voltage stabilizing resistor R5 is electrically connected with the input end; the output end of the NPN triode Q1 is electrically connected with the input end of the bias resistor R4, so that the effect of realizing redundant current sharing is good, the cost is low, and the realization mode is simple.
Description
Technical Field
The utility model relates to a switching power supply field, more specifically say, relate to a novel passive equal current circuit.
Background
The switching power supply is a power supply which utilizes modern power electronic technology to control the on-off time ratio of a switching tube and maintain stable output voltage, and generally consists of a Pulse Width Modulation (PWM) control 1C and an MOSFET. With the development and innovation of power electronic technology, the technology of the switching power supply is continuously innovated. At present, the switching power supply is widely applied to almost all electronic devices with the characteristics of small size, light weight and high efficiency, and is an indispensable power supply mode for the rapid development of the electronic information industry at present.
The traditional switch power supply parallel current-sharing circuit is an active chip current-sharing technology represented by UC3902, the power supply problem of the chip needs to be separately processed in the high-voltage occasion, the operation and amplification mode inside the chip is very complex, and the peripheral circuit of the chip is not simple.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
To the problem that exists among the prior art, the utility model aims to provide a novel passive equal current circuit, it realizes that the redundancy flow equalizes effectually, and the cost is lower, and implementation is simple.
2. Technical scheme
In order to solve the above problem, the utility model adopts the following technical scheme:
a novel passive current-sharing circuit comprises a power supply voltage input end VO, an electronic switching element Q2, a voltage-stabilizing resistor R5, an NPN triode Q1, a biasing resistor R4, a voltage-stabilizing diode ZD1, a precise voltage-stabilizing source A1, a power supply resistor R3, a second sampling resistor R2, a first sampling resistor R1 and a power supply voltage output end VOUT;
the output end of the power supply voltage input end VO is electrically connected with the input end of an electronic switching element Q2, the control end of the electronic switching element Q2 is electrically connected with the input end of a power supply voltage output end VOUT, and the output end of the electronic switching element Q2 is electrically connected with the input end of an NPN triode Q1 and the input end of a voltage stabilizing resistor R5 respectively;
the output end of the voltage stabilizing resistor R5 is electrically connected with the input end;
the output end of the NPN triode Q1 is electrically connected with the input end of a bias resistor R4, the control end of the NPN triode Q1 is electrically connected with the output end of a bias resistor R4, and the output end of the bias resistor R4 is electrically connected with the input end of a zener diode ZD 1;
the output end of the NPN triode Q1 is also electrically connected with the input end of a precision voltage-stabilizing source A1, the output end of the voltage-stabilizing diode ZD1 is electrically connected with the output end of the precision voltage-stabilizing source A1, and the output end of the precision voltage-stabilizing source A1 is electrically connected with the input end of a power supply resistor R3;
the output end of the NPN triode Q1 is also electrically connected with the input end of a second sampling resistor R2, the output end of the second sampling resistor R2 is electrically connected with the input end of a first sampling resistor R1, the output end of the power supply resistor R3 is electrically connected with the output end of a first sampling resistor R1, and the output end of the first sampling resistor R1 is electrically connected with the input end of a power supply voltage output end VOUT, so that the effect of achieving redundancy current sharing is good, the cost is low, and the implementation mode is simple.
As a preferred embodiment of the present invention, the electronic switching element Q2 is a P-MOS transistor.
As an optimized scheme of the utility model, the equal electricity of input of the output of NPN triode Q1, biasing resistance R4, accurate steady voltage source a1, second sampling resistance R2 is connected with public earthing terminal GND.
3. Advantageous effects
Compared with the prior art, the utility model has the advantages of:
the scheme has the advantages of good effect of realizing redundancy flow equalization, low cost and simple realization mode.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", 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 in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, such as "connected," which may be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
with reference to fig. 1, a novel passive current-sharing circuit includes a power supply voltage input terminal VO, a P-MOS transistor serving as an electronic switching element Q2, a voltage regulator resistor R5, an NPN triode Q1, a bias resistor R4, a voltage regulator diode ZD1, a precision voltage regulator a1, a power supply resistor R3, a second sampling resistor R2, a first sampling resistor R1, and a power supply voltage output terminal VOUT, where, for example, the precision voltage regulator a1 is a TL431 precision voltage regulator a 1;
the output end of a power supply voltage input end VO is electrically connected with the input end a of an electronic switch element Q2, the control end c of an electronic switch element Q2 is electrically connected with the input end of a power supply voltage output end VOUT, and the output end b of an electronic switch element Q2 is electrically connected with the input end of an NPN triode Q1 and the input end of a voltage stabilizing resistor R5 respectively;
the output end of the voltage stabilizing resistor R5 is electrically connected with the input end;
an output end g of the NPN triode Q1 is electrically connected with an input end of a bias resistor R4, a control end f of the NPN triode Q1 is electrically connected with an output end of the bias resistor R4, and an output end of the bias resistor R4 is electrically connected with an input end of a zener diode ZD 1;
the output end g of the NPN triode Q1 is also electrically connected with the input end of a TL431 precision voltage-stabilizing source A1, the output end of a voltage-stabilizing diode ZD1 is electrically connected with the output end of a TL431 precision voltage-stabilizing source A1, and the output end of the TL431 precision voltage-stabilizing source A1 is electrically connected with the input end of a power supply resistor R3;
the output end g of the NPN triode Q1 is also electrically connected with the input end of the second sampling resistor R2, the output end of the second sampling resistor R2 is electrically connected with the input end of the first sampling resistor R1, the output end of the power supply resistor R3 is electrically connected with the output end of the first sampling resistor R1, and the output end of the first sampling resistor R1 is electrically connected with the input end of the power supply voltage output end VOUT;
the output end g of the NPN triode Q1, the bias resistor R4, the TL431 precision voltage regulator A1 and the input end of the second sampling resistor R2 are all electrically connected with a common ground end GND.
Specifically, when one of the paths of power supply has a large current, the voltage drop of the power supply, that is, the voltage drop of the electronic switching element Q2 is larger than the voltage drop of the electronic switching element Q2 on the other path, so that the voltage of the other path is higher than the voltage of the other path, the sampling voltage of the TL431 precision voltage regulator a1 is at a high level, the TL431 precision voltage regulator a1 is turned on, the NPN triode Q1 is not turned on, and the electronic switching element Q2 is turned off, so that when the current of one path of the power supply in parallel exceeds the current equalizing value, the electronic switching element Q2 of the path is turned off to reduce the current value of the path, and finally, the redundant current equalizing effect is achieved.
The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention.
Claims (3)
1. A novel passive current-sharing circuit is characterized in that: the device comprises a power supply voltage input end (VO), an electronic switch element (Q2), a voltage stabilizing resistor (R5), an NPN triode (Q1), a bias resistor (R4), a voltage stabilizing diode (ZD1), a precise voltage stabilizing source (A1), a power supply resistor (R3), a second sampling resistor (R2), a first sampling resistor (R1) and a power supply voltage output end (VOUT);
the output end of the power supply voltage input end (VO) is electrically connected with the input end of an electronic switch element (Q2), the control end of the electronic switch element (Q2) is electrically connected with the input end of the power supply voltage output end (VOUT), and the output end of the electronic switch element (Q2) is electrically connected with the input end of an NPN triode (Q1) and the input end of a voltage stabilizing resistor (R5) respectively;
the output end of the voltage stabilizing resistor (R5) is electrically connected with the input end;
the output end of the NPN triode (Q1) is electrically connected with the input end of a bias resistor (R4), the control end of the NPN triode (Q1) is electrically connected with the output end of a bias resistor (R4), and the output end of the bias resistor (R4) is electrically connected with the input end of a zener diode (ZD 1);
the output end of the NPN triode (Q1) is also electrically connected with the input end of a precision voltage-stabilizing source (A1), the output end of the voltage-stabilizing diode (ZD1) is electrically connected with the output end of the precision voltage-stabilizing source (A1), and the output end of the precision voltage-stabilizing source (A1) is electrically connected with the input end of a power supply resistor (R3);
the output end of the NPN triode (Q1) is also electrically connected with the input end of a second sampling resistor (R2), the output end of the second sampling resistor (R2) is electrically connected with the input end of a first sampling resistor (R1), the output end of the power supply resistor (R3) is electrically connected with the output end of a first sampling resistor (R1), and the output end of the first sampling resistor (R1) is electrically connected with the input end of a power supply voltage output end (VOUT).
2. A novel passive current sharing circuit according to claim 1, wherein: the electronic switching element (Q2) is a P-MOS tube.
3. A novel passive current sharing circuit according to claim 1, wherein: the output end of the NPN triode (Q1), the bias resistor (R4), the precision voltage regulator (A1) and the input end of the second sampling resistor (R2) are all electrically connected with a common ground end (GND).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922333242.3U CN210958153U (en) | 2019-12-23 | 2019-12-23 | Novel passive current-sharing line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922333242.3U CN210958153U (en) | 2019-12-23 | 2019-12-23 | Novel passive current-sharing line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210958153U true CN210958153U (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922333242.3U Active CN210958153U (en) | 2019-12-23 | 2019-12-23 | Novel passive current-sharing line |
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| Country | Link |
|---|---|
| CN (1) | CN210958153U (en) |
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2019
- 2019-12-23 CN CN201922333242.3U patent/CN210958153U/en active Active
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