Current-sharing power supply board card of redundant power supply

Abstract

The current-sharing power supply board card comprises an operational amplifier, a first redundant power source, a second redundant power source and a field effect transistor, the positive phase input end of the operational amplifier is connected with the input end of the first redundant power source, and the negative phase input end of the operational amplifier is connected with the input end of the second redundant power source. The grid electrode of the field effect transistor is connected with the output end of the operational amplifier, the source electrode of the field effect transistor is connected with the input end of the first redundant power supply, the drain electrode of the field effect transistor is connected with the output end of the first redundant power supply, and the grid electrode of the field effect transistor and the source electrode of the field effect transistor are connected with an R2 resistor in series; the input end and the output end of the first redundant ground power supply are connected in series with more than two second diodes, and the more than two second diodes are connected between the drain electrode and the source electrode of the field effect transistor, so that the voltage values of the first redundant power supply and the second redundant power supply can be continuously adjusted, and a certain power supply is prevented from continuously supplying power; the problem that a single power supply continuously supplies power to heat is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power supply boards, and in particular to a current-sharing power supply board for a redundant power supply. Background Art

[0002] Redundant power supplies are often used in critical equipment and systems with extremely high power requirements to ensure power continuity in the event of a primary power failure. Ideally, the two power supplies are load-balanced, providing power to the system simultaneously. If one power supply fails, the other immediately assumes the entire load, ensuring stable operation of the equipment and system.

[0003] However, the actual situation is that there is a slight difference in the voltage output by the two power modules. When the output voltage of one power supply is greater than that of the other power supply, the load will draw power from the power supply with a higher output voltage. This will cause one of the power supplies to the load for a long time, resulting in board heating, shortened lifespan, and reduced system stability. Utility Model Content

[0004] In view of this, the present application proposes a current-sharing power supply board for redundant power supplies, which enables two power supplies to adaptively control output.

[0005] According to one aspect of the present application, a current-sharing power supply board for a redundant power supply is provided, comprising: an operational amplifier, a first redundant power supply, a second redundant power supply, and a field-effect transistor;

[0006] The positive phase input terminal of the operational amplifier is connected to the input terminal of the first redundant power supply circuit, and the negative phase input terminal of the operational amplifier is connected to the input terminal of the second redundant power supply circuit;

[0007] The gate of the field-effect transistor is connected to the output of the operational amplifier, the source of the field-effect transistor is connected to the input of the first redundant power supply, the drain of the field-effect transistor is connected to the output of the first redundant power supply, a resistor R2 is connected in series between the gate and source of the field-effect transistor, a first diode is connected in series between the input and output of the second redundant power supply, and two or more second diodes are connected in series between the input and output of the first redundant ground power supply, and the two or more second diodes are connected between the drain and source of the field-effect transistor.

[0008] In a possible implementation, the field effect transistor is connected in parallel with two or more second diodes.

[0009] In a possible implementation, the number of the second diodes is two;

[0010] The field effect transistor is connected in parallel with the two second diodes.

[0011] In a possible implementation, an output terminal of the operational amplifier and a gate of the field effect transistor are connected in series via a resistor R1.

[0012] In one possible implementation, both the first diode and the second diode are Schottky diodes.

[0013] In one possible implementation, a non-inverting input terminal of the operational amplifier and the first redundant power supply are connected in series with a first capacitor and a resistor R3.

[0014] In a possible implementation, the resistor R3 is connected in series with an output end of the first redundant power supply through a resistor R6.

[0015] In one possible implementation, a negative phase input terminal of the operational amplifier and the second redundant power supply are connected in series with a second capacitor and a resistor R4.

[0016] In a possible implementation, a resistor R7 is connected in series between the resistor R4 and the output end of the second redundant power supply.

[0017] In one possible implementation, the first resistor is connected in parallel with a third capacitor.

[0018] The beneficial effects of the current-sharing power supply board of the redundant power supply of the embodiment of the present application are as follows: when the two first redundant power supplies and the second redundant power supplies are input normally, at this time, because the circuit of the first redundant power supply contains two Schottky diodes, the positive input of the subsequent board is less than the negative input voltage. At this time, the output end outputs a low voltage. After the voltage is divided by the R1 resistor and the R2 resistor, the gate voltage of the PMOS field effect tube is 12V. At this time, the MOS tube Vgs<0, the MOS tube is turned on, and after the conduction, the two Schottky diodes are short-circuited by the MOS tube. At this time, the power supply voltage at both ends of the first redundant power supply is greater than the power supply voltage at both ends of the second redundant power supply. The subsequent board draws power from the first redundant power supply, and at the same time, the positive input of the subsequent board The second redundant power supply directly provides 24VA. The second redundant power supply contains a Schottky diode, so the positive input voltage of the downstream card is greater than the negative input voltage. At this point, the downstream card's output voltage is 24V, the MOS transistor's Vgs value is greater than 0, and the MOS transistor is turned off. At this point, the voltage across the second redundant power supply is greater than the voltage across the first redundant power supply, and the downstream card draws power from the second redundant power supply. This process repeats repeatedly, quickly switching between the first and second redundant power supplies to power the downstream card. This method continuously adjusts the voltages of the first and second redundant power supplies to prevent either power supply from being continuously supplied, thus resolving the issue of overheating caused by a single power supply. This approach, at extremely low cost, enables the power supply card in equipment and systems to have adaptive output control capabilities with high adjustment accuracy, significantly reducing card heat generation, extending its service life, and improving system stability and reliability.

[0019] Further features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0021] Figure 1 A circuit diagram of a current-sharing power supply board for a redundant power supply according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0023] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and 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 therefore cannot be understood as a limitation to the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0025] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0026] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0027] See Figure 1 The redundant power supply current sharing board of the embodiment of the present application includes: an operational amplifier 300, a first redundant power supply 100, a second redundant power supply 200, and a field effect transistor 400. The positive input terminal of the operational amplifier 300 is connected to the input terminal of the first redundant power supply 100, the negative input terminal of the operational amplifier 300 is connected to the input terminal of the second redundant power supply 200 circuit, the gate of the field effect transistor 400 is connected to the output terminal of the operational amplifier 300, the source of the field effect transistor 400 is connected to the input terminal of the first redundant power supply 100, and the drain of the field effect transistor 400 is connected to the output terminal of the first redundant power supply 100. The gate of the field effect transistor 400 and the source of the field effect transistor 400 are connected in series with an R2 resistor 510. The input and output terminals of the second redundant power supply 200 are connected in series with a first diode 210. The input and output terminals of the first redundant power supply are connected in series with two or more second diodes 110. The two or more second diodes 110 are connected between the drain and source of the field effect transistor 400.

[0028] The output end of the current-sharing power supply board of the redundant power supply is connected to the subsequent board to provide power to the subsequent board.

[0029] In this embodiment, when the two first redundant power supplies 100 and the second redundant power supply 200 are input normally, because the circuit of the first redundant power supply 100 contains two Schottky diodes, the positive input of the subsequent board is less than the negative input voltage. At this time, the output end outputs a low voltage. After the voltage is divided by the R1 resistor 520 and the R2 resistor 510, the gate voltage of the PMOS field effect transistor 400 is 12V. At this time, the MOS transistor Vgs is less than 0, the MOS transistor is turned on, and after the conduction, the two Schottky diodes are short-circuited by the MOS transistor. At this time, the power supply voltage at both ends of the first redundant power supply 100 is greater than the power supply voltage at both ends of the second redundant power supply 200. The subsequent board draws power from the first redundant power supply 100. At the same time, the positive input of the subsequent board is 24VA. The second redundant power supply 200 contains a Schottky diode. Therefore, the positive input voltage of the downstream board is greater than the negative input voltage. At this point, the output voltage of the downstream board is 24V, the Vgs of the MOS transistor is greater than 0, and the MOS transistor is turned off. At this point, the voltage across the power supply of the second redundant power supply 200 is greater than the voltage across the power supply of the first redundant power supply 100, and the downstream board draws power from the second redundant power supply 200. This process is repeated to achieve the goal of quickly switching between the first redundant power supply 100 and the second redundant power supply 200 to power the downstream board. This method continuously adjusts the voltage values of the first redundant power supply 100 and the second redundant power supply 200 to prevent one power supply from continuously supplying power, thus solving the problem of overheating caused by continuous power supply from a single power supply. In this way, at extremely low cost, the power supply board of the equipment and system has the ability to adaptively control output with high adjustment accuracy, significantly reducing board heat generation, thereby extending its service life and improving system stability and reliability.

[0030] If one power supply fails, the operational amplifier 300 will stop working when the first redundant power supply 100 fails. The second redundant power supply 200 will directly supply power to the subsequent boards through the first diode 210, which serves as a reverse diode. Similarly, if the first redundant power supply 100 fails, the operational amplifier 300 will stop working, and the first redundant power supply 100 will supply power to the subsequent boards through the reverse diode.

[0031] It should be noted that the power supply voltages of the first redundant power supply 100 and the second redundant power supply 200 are both 24V, the resistance values of R1 , R2 , R3 and R4 are 10KΩ, and the resistance values of R6 and R7 are 20mΩ.

[0032] In one embodiment, the field effect transistor 400 is connected in parallel with two or more second diodes 110 .

[0033] In this embodiment, the number of second diodes 110 is two, which can be greater than the number of diodes connected to the second redundant power supply 200. In this case, the positive input voltage of the operational amplifier 300 is smaller than the negative input voltage. The field-effect transistor 400 is connected in parallel with two or more second diodes 110.

[0034] In one embodiment, a resistor R1 520 is connected in series between the output of operational amplifier 300 and the gate of field-effect transistor 400 to prevent damage to the output due to overcurrent. If the output is directly connected to a low-impedance load, excessive output current may result, potentially damaging operational amplifier 300. By connecting a resistor in series, the output current can be limited, protecting operational amplifier 300.

[0035] In a specific embodiment, the first diode 210 and the second diode 110 are both Schottky diodes, which have a very high reverse resistance.

[0036] In a specific embodiment, a first capacitor 550 and an R3 resistor 530 are connected in series between the non-inverting input terminal of the operational amplifier 300 and the first redundant power supply 100 to prevent the operational amplifier 300 from generating self-oscillation.

[0037] In a specific embodiment, the R3 resistor 530 is connected in series with the output end of the first redundant power supply 100 and the R6 resistor 120 is connected in series between the input and output ends of the first redundant power supply 100 to measure and monitor the magnitude and change of the current.

[0038] In a specific embodiment, a second capacitor 560 and an R4 resistor 540 are connected in series between the negative input terminal of the operational amplifier 300 and the second redundant power supply 200 to prevent the operational amplifier 300 from generating self-oscillation.

[0039] In this embodiment, the R4 resistor 540 is connected in series with the output end of the second redundant power supply 200 and the R7 resistor 220 is connected in series between the input and output ends of the second redundant power supply 200 to measure and monitor the magnitude and change of the current.

[0040] In one embodiment, the R2 resistor 510 is connected in parallel with a third capacitor 511 .

[0041] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A current-sharing power supply card for a redundant power supply, characterized in that: include: An operational amplifier, a first redundant power supply, a second redundant power supply, and a field effect transistor; The positive phase input terminal of the operational amplifier is connected to the output terminal of the first redundant power supply, and the negative phase input terminal of the operational amplifier is connected to the output terminal of the second redundant power supply; The gate of the field-effect transistor is connected to the output of the operational amplifier, the source of the field-effect transistor is connected to the input of the first redundant power supply, the drain of the field-effect transistor is connected to the output of the first redundant power supply, a resistor R2 is connected in series between the gate and source of the field-effect transistor, a first diode is connected in series between the input and output of the second redundant power supply, and two or more second diodes are connected in series between the input and output of the first redundant power supply, and the two or more second diodes are connected between the drain and source of the field-effect transistor.

2. The current-sharing power supply board for redundant power supply according to claim 1, characterized in that: The field effect transistor is connected in parallel with two or more second diodes.

3. The current-sharing power supply board for redundant power supply according to claim 2, characterized in that: The number of the second diodes is two; The field effect transistor is connected in parallel with the two second diodes.

4. The current-sharing power supply board for redundant power supply according to claim 1, characterized in that: The output end of the operational amplifier and the gate of the field effect tube are connected in series with a resistor R1.

5. The current-sharing power supply board for redundant power supply according to claim 1, characterized in that: The first diode and the second diode are both Schottky diodes.

6. The current-sharing power supply board for redundant power supply according to claim 1, characterized in that: The non-inverting input terminal of the operational amplifier and the first redundant power supply are connected in series with a first capacitor and a resistor R3.

7. The current-sharing power supply board for redundant power supply according to claim 6, characterized in that: The R3 resistor is connected in series with an R6 resistor at the output end of the first redundant power supply.

8. The current-sharing power supply board for redundant power supply according to claim 1, characterized in that: The negative phase input terminal of the operational amplifier and the second redundant power supply are connected in series with a second capacitor and a resistor R4.

9. The current-sharing power supply board for redundant power supply according to claim 8, characterized in that: The R4 resistor and the output end of the second redundant power supply are connected in series with an R7 resistor.

10. The current-sharing power supply board for redundant power supply according to claim 1, characterized in that: The resistor R2 is connected in parallel with a third capacitor.

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