Power supply current-sharing bus circuit of automatic isolation fault module

Abstract

The utility model discloses a power supply current-sharing bus circuit of an automatic isolation fault module, which comprises a plurality of current-sharing bus switch control circuits, each current-sharing bus switch control circuit comprises a first MOS tube and a second MOS tube, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube. The source electrode of the first MOS tube is connected with the common current-sharing bus signal ISHARE, the source electrode of the second MOS tube is connected with the current-sharing bus pin SHARE of the power supply module, and the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are both connected with the + 12V voltage output pin AUX of the power supply module. When one or more current-sharing bus switch control circuits break down, the current-sharing bus switch control circuit with the fault can be automatically isolated, so that the current-sharing bus circuit can be quickly and completely disconnected, fault isolation is realized, and the operation of other normal current-sharing bus switch control circuits is not influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit control technical field more specifically, is related to a kind of power supply current-sharing bus circuit of automatic isolation fault module. BACKGROUND

[0002] In modular power supply system, current-sharing technology is the key to realize efficient and stable operation. Traditional current-sharing methods include master-slave control, droop control, average current control, etc. Among them, parallel current-sharing bus circuit is widely used due to its simple structure, easy implementation and good current-sharing effect. This circuit connects the output terminals of all power modules through a shared bus, and uses specific current-sharing control strategies (such as voltage droop method, current-sharing bus method, etc.) to make each module automatically adjust output current according to load demand, achieving current balance. This design not only improves the reliability and efficiency of the system, but also facilitates maintenance and upgrading.

[0003] However, in complex operating environments, power modules may fail due to component aging, overheating, short circuits, or external interference. If the faulty module is not isolated in time, it will not only affect the stability and reliability of the entire power supply system, but also may cause more serious failures, such as system crash, data loss, or even equipment damage.

[0004] Therefore, implementing a fast and accurate fault isolation mechanism is crucial for ensuring continuous system operation. SUMMARY

[0005] To overcome the problem that existing power modules may fail and affect the stability and reliability of the entire power supply system if not isolated in time, the utility model provides a power supply current-sharing bus circuit that automatically isolates faulty modules.

[0006] The technical solution of the utility model is as follows:

[0007] A power supply current-sharing bus circuit that automatically isolates faulty modules includes multiple current-sharing bus switch control circuits. Each current-sharing bus switch control circuit includes a first MOS tube and a second MOS tube. The drain of the first MOS tube is interconnected with the drain of the second MOS tube. The source of the first MOS tube is connected to the common current-sharing bus signal ISHARE. The source of the second MOS tube is connected to the power module current-sharing bus pin SHARE. The gate of the first MOS tube and the gate of the second MOS tube are both connected to the power module +12V voltage output pin AUX.

[0008] According to the utility model of the above-mentioned scheme, it also includes software control circuit, and each current-sharing bus switch control circuit is connected with the software control circuit.

[0009] The utility model discloses a software control circuit, the software control circuit includes the triode, the base of triode connects the singlechip control pin SHARE_ONOFF, the base of triode still is connected with SHARE_OFF signal, the collector of triode connects the gate of first MOS tube and the gate of second MOS tube, the emitter of triode is grounded.

[0010] The utility model discloses a software control circuit, the software control circuit still includes first resistance and electric capacity, one end of first resistance connects the base of triode, the other end of first resistance connects the emitter of triode, one end of electric capacity connects the base of triode, the other end of electric capacity connects the emitter of triode.

[0011] The utility model discloses a software control circuit, the software control circuit still includes first resistance and electric capacity, one end of first resistance connects the base of triode, the other end of first resistance connects the emitter of triode, one end of electric capacity connects the base of triode, the other end of electric capacity connects the emitter of triode.

[0012] The utility model discloses a software control circuit, the software control circuit still includes first resistance and electric capacity, one end of first resistance connects the base of triode, the other end of first resistance connects the emitter of triode, one end of electric capacity connects the base of triode, the other end of electric capacity connects the emitter of triode.

[0013] The utility model discloses a software control circuit, the software control circuit still includes first resistance and electric capacity, one end of first resistance connects the base of triode, the other end of first resistance connects the emitter of triode, one end of electric capacity connects the base of triode, the other end of electric capacity connects the emitter of triode.

[0014] The utility model discloses a software control circuit, the software control circuit still includes first resistance and electric capacity, one end of first resistance connects the base of triode, the other end of first resistance connects the emitter of triode, one end of electric capacity connects the base of triode, the other end of electric capacity connects the emitter of triode. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the circuit diagram of the utility model;

[0016] Figure 2 It is Figure 1 The enlarged structure schematic view of part circuit in DETAILED DESCRIPTION

[0017] In order to make the technical problem, technical scheme and beneficial effect that the utility model wants to solve more clearly clear, the following combines the drawing and the embodiment, and this utility model carries out further detailed explanation.

[0018] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and claims of the present application are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device that includes a list of steps or units is not limited to the listed steps or units, but can optionally further include steps or units not listed, or can optionally further include other steps or units inherent to such processes, methods, products or devices. The terms "provided" and the like should be broadly understood, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. The terms "up", "down", "left", "right", "front", "back", "bottom" and the like indicate the orientation or position based on the orientation or position shown in the drawings, and are only for the convenience of description, and cannot be understood as a limitation on the technical solution.

[0019] It should be noted that for the model of multiple module power supply parallel operation, the current equalization between the modules is mostly realized by parallel current equalization bus circuit.

[0020] In a complex operating environment, power modules may fail due to component aging, overheating, short circuit, or external interference. If the faulty module is not isolated in time, not only will it affect the stability and reliability of the entire power supply system, but it may also cause more serious failures, such as system crash, data loss, or even equipment damage.

[0021] As shown in Figure 1 The present embodiment provides a power supply current equalization bus circuit that automatically isolates faulty modules. When one or more current equalization bus switch control circuits fail, the faulty current equalization bus switch control circuit can be automatically isolated, allowing it to quickly and completely disconnect the current equalization bus circuit, thereby achieving fault isolation without affecting the operation of other normal current equalization bus switch control circuits.

[0022] Specifically, it includes a plurality of current equalization bus switch control circuits, each of which includes a first MOS tube and a second MOS tube, the drain of the first MOS tube is interconnected with the drain of the second MOS tube, the source of the first MOS tube is connected to the common current equalization bus signal ISHARE, the source of the second MOS tube is connected to the power module current equalization bus pin SHARE, and the gate of the first MOS tube and the gate of the second MOS tube are both connected to the power module +12V voltage output pin AUX.

[0023] The working principle is that when all the parallel connection current sharing bus switch control circuits are normally working, the power module +12V voltage output pin AUX of the module outputs high level, controlling the first MOS and the second MOS to be turned on. After being turned on, all the power module current sharing bus pins SHARE are connected in parallel to obtain the common current sharing bus signal ISHARE, thereby realizing the current sharing function.

[0024] When one or several modules are faulty, the power module +12V voltage output pin AUX outputs low level, the first MOS and the second MOS in the circuit are both turned off, and the power module current sharing bus pin SHARE of the faulty module is disconnected from the common current sharing bus signal ISHARE, so that the faulty module is isolated. The current sharing function of other normal modules is not affected.

[0025] The circuit has high reliability, can be used in parallel with multiple current sharing bus switch control circuits, and is not limited by the number of module power supplies.

[0026] The current sharing function of the parallel connection module power supply is automatically controlled, and the faulty module can be isolated without additional sampling and judgment.

[0027] In one embodiment, the power current sharing bus circuit for automatically isolating faulty modules further comprises a software control circuit, and each of the current sharing bus switch control circuits is connected with the software control circuit. A software control circuit is added, and if the current sharing of the parallel connection current sharing bus switch control circuits is not needed, the power module current sharing bus pin SHARE of all the parallel connection power modules in the entire circuit is disconnected from the common current sharing bus signal ISHARE by the single-chip microcomputer control.

[0028] Specifically, the software control circuit comprises a transistor, the base of the transistor is connected with a single-chip microcomputer control pin SHARE_ONOFF, the base of the transistor is also connected with a SHARE_OFF signal, the collector of the transistor is connected with the gate of the first MOS and the gate of the second MOS, and the emitter of the transistor is grounded.

[0029] When the current sharing of the current sharing bus switch control circuits is not needed, it can be controlled by the software control circuit. Specifically, the single-chip microcomputer changes the single-chip microcomputer control pin SHARE_ONOFF from low level to high level, at this time the transistor is saturated and turned on, the SHARE_OFF signal becomes low level (about 0.3V), the first MOS and the second MOS in the current sharing bus switch control circuit are turned off, and all the power module current sharing bus pins SHARE are disconnected from the common current sharing bus end ISHARE, so that the current sharing function is turned off.

[0030] In this embodiment, the software control circuit further includes a first resistor and a capacitor, one end of the first resistor is connected to the base of the transistor, the other end of the first resistor is connected to the emitter of the transistor, one end of the capacitor is connected to the base of the transistor, and the other end of the capacitor is connected to the emitter of the transistor.

[0031] The current-sharing bus switch control circuit further includes a diode, the positive electrode of the diode is connected to the gate of the first MOS tube and the gate of the second MOS tube, and the negative electrode of the diode is connected to the collector of the transistor. The diode functions as a one-way conductor, ensuring that current can only flow from the gates of the two MOS tubes to the collector of the transistor. This helps to protect the MOS tubes from reverse voltage damage and ensures proper transmission of control signals.

[0032] A second resistor is connected in series between the source of the first MOS tube and the common current-sharing bus signal ISHARE, for limiting current, voltage division, or as part of current detection.

[0033] A third resistor is connected in series between the gate of the first MOS tube, the gate of the second MOS tube, and the +12V voltage output pin AUX of the power module. The third resistor is used to limit the current flowing from the AUX pin to the gate of the MOS tube, protecting the gate from excessive current damage and helping to stabilize the gate voltage.

[0034] For example, module power supply 1 (corresponding to SHARE1) and module power supply 3 (corresponding to SHARE3) in Figure 2

[0035] a) When the module power supply is working normally, the power module +12V voltage output pin AUX1 corresponding to the module power supply 1 and the power module +12V voltage output pin AUX3 corresponding to the module power supply 3 both output high level (+12V), at this time the MOS tubes Q2-A, Q2-B, Q21-A, Q21-B are opened, and the power module current-sharing bus pin SHARE1 is connected in series with resistor R31 and is connected in parallel on the common current-sharing bus ISHARE. The power module current-sharing bus pin SHARE3 is connected in series with resistor R36 and is also connected in parallel on the common current-sharing bus ISHARE, and the other module power supplies are the same, at this time the current-sharing function of all module power supplies is in the open state.

[0036] b) Assuming that the module power supply 1 fails, at this time the power module +12V voltage output pin AUX1 corresponding to the module power supply 1 outputs low level (0V), the MOS tubes Q2-A, Q2-B are closed, and the power module current-sharing bus pin SHARE1 is automatically disconnected from the common current-sharing bus ISHARE, achieving isolation of the current-sharing control and preventing interference with other normally working module power supplies.

[0037] ​It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the utility model.

[0038] The utility model patent is exemplarily described above in combination with the drawings, obviously, the implementation of the utility model patent is not limited by the above-mentioned mode, as long as various improvements are made by using the method concept and technical scheme of the utility model patent, or the concept and technical scheme of the utility model patent are directly applied to other occasions without improvement, all are within the protection scope of the utility model.

Claims

1. A power sharing bus circuit for an automatic fault isolation module, characterized in that, The application relates to a power supply module, which comprises a plurality of current-sharing bus switch control circuits, each of which comprises a first MOS tube and a second MOS tube, the drain of the first MOS tube is interconnected with the drain of the second MOS tube, the source of the first MOS tube is connected with a common current-sharing bus signal ISHARE, the source of the second MOS tube is connected with a power module current-sharing bus pin SHARE, and the gate of the first MOS tube and the gate of the second MOS tube are both connected with a power module +12V voltage output pin AUX.

2. A power bus circuit for automatically isolating a fault module according to claim 1, wherein, The application further comprises a software control circuit, and each current-sharing bus switch control circuit is connected with the software control circuit.

3. The power bus circuit of claim 2, wherein, The software control circuit comprises a triode, the base of the triode is connected with a single-chip microcomputer control pin SHARE_ONOFF, the base of the triode is also connected with a SHARE_OFF signal, the collector of the triode is connected with the gate of the first MOS tube and the gate of the second MOS tube, and the emitter of the triode is grounded.

4. The power bus circuit of claim 3, wherein, The software control circuit further comprises a first resistor and a capacitor, one end of the first resistor is connected with the base of the triode, the other end of the first resistor is connected with the emitter of the triode, one end of the capacitor is connected with the base of the triode, and the other end of the capacitor is connected with the emitter of the triode.

5. A power bus circuit for automatically isolating a fault module according to claim 3 or 4, characterized in that The current-sharing bus switch control circuit further comprises a diode, the anode of the diode is connected with the gate of the first MOS tube and the gate of the second MOS tube, and the cathode of the diode is connected with the collector of the triode.

6. A power bus circuit for automatically isolating a fault module according to claim 5, wherein, A second resistor is connected in series between the source of the first MOS tube and the common current-sharing bus signal ISHARE.

7. The power bus current sharing circuit of claim 5, wherein, A third resistor is connected in series between the gate of the first MOS tube and the gate of the second MOS tube and the power module +12V voltage output pin AUX.

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