A self-detection method and system for current balancing circuit

Abstract

The present invention belongs to the field of current balancing technology, and discloses a self-detection method and system of a current balancing circuit, wherein the system comprises: a plurality of switching power supplies, the plurality of switching power supplies are connected in parallel; a current balancing module, electrically connected to the plurality of switching power supplies, respectively, for adjusting the output current of each switching power supply; a control module, the control module having a plurality of control terminals, each control terminal being connected in series between the corresponding switching power supply and the current balancing module; a current acquisition module, for respectively acquiring the output current of the plurality of switching power supplies, the current acquisition module being electrically connected to the control module, each control terminal of the control module being used to output a cut-off signal, the cut-off signal being used to cut off the connection between the switching power supply and the current balancing module. The current balancing circuit of the present invention has high stability, and has good practicality and reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of current balancing, and in particular relates to a self-detection method and system for a current balancing circuit. Background Art

[0002] A switching power supply is a high-frequency power conversion device and a type of power supply. Its function is to convert a voltage level into the voltage or current required by the user through different forms of architecture. The input of a switching power supply is mainly AC power (such as mains) or DC power, and the output is mainly equipment that requires DC power, such as personal computers, and the switching power supply performs voltage and current conversion between the two.

[0003] In the actual use of switching power supplies, various loads have different requirements for power supply reliability. When a single power supply cannot provide the full capacity of the load, multiple power modules need to be used in parallel to improve the capacity and reliability of the power supply. The usual way of use is parallel operation or parallel redundant operation. The principle is to use N power modules in parallel to provide the full capacity of the load or more than the full capacity of the load.

[0004] The dispersion of the parameters of the switching power supplies results in differences in the open circuit voltage and internal resistance of each power supply. Usually, the internal resistance of the switching power supplies is very small, so a small difference in the open circuit voltage will lead to a large difference in the output current of each switching power supply. This state will cause inconsistent life attenuation of each switching power supply and fail to meet the reliability and stability requirements of the power supply. This requires the use of current balancing technology when the power supplies are used in parallel.

[0005] At present, the average current automatic current equalization method is one of the commonly used current equalization methods. The average current method can accurately realize current equalization, but some special problems will arise in specific applications. For example, when any module connected to the bus fails to work, the bus voltage drops, which will cause the voltage of each module to be lowered, or even reach its lower limit, resulting in a fault. When the current of a module rises to its limit, the module increases significantly, which will also cause its input voltage to automatically adjust to the lower limit. Therefore, when any power supply fails in the existing average current method circuit, it will affect the normal operation of other modules, thereby causing the entire current equalization circuit to fail. Summary of the invention

[0006] The purpose of the present invention is to provide a self-detection method and system for a current balancing circuit, so as to solve the problem that when any power supply of the existing average current method circuit fails, the normal operation of other modules will be affected, thereby causing the entire current balancing circuit to fail.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a self-detection method for a current balancing circuit, the method being applied to a self-detection system, the self-detection system comprising: a plurality of switching power supplies, a current balancing module and a control module, the plurality of switching power supplies being connected in parallel, the plurality of switching power supplies being electrically connected to the current balancing module, the control module having a plurality of control terminals, each control terminal being connected in series between a corresponding switching power supply and the current balancing module, each control terminal of the control module being used to output a cut-off signal, the cut-off signal being used to cut off the connection between the switching power supply and the current balancing module; the method comprising:

[0009] Acquire real-time operating parameters of each switching power supply, wherein the real-time operating parameters include at least: output current, input voltage and operating temperature;

[0010] Inputting input voltage and operating temperature in real-time operating parameters into a pre-built current prediction model to predict the current prediction value of each switching power supply in a future period;

[0011] Determine the current fluctuation of each switching power supply in the future period according to the output current in the real-time working parameters and the current prediction value in the future period;

[0012] When the current fluctuation of any switching power supply in a future period meets a preset condition, a cut-off time of the switching power supply is determined, and a cut-off signal of the switching power supply is generated at the cut-off time.

[0013] Preferably, the preset condition is that the amplitude of the current fluctuation in the future time period exceeds the preset amplitude for a preset number of times, and the preset number of times is determined by the predicted total number of future time periods.

[0014] Preferably, the method further comprises: constructing a current prediction model, comprising:

[0015] Acquire historical operating parameters of the switching power supply, and construct training samples based on the historical operating parameters of the switching power supply;

[0016] The neural network is trained with the training samples until the neural network converges to obtain a trained neural network, and the trained neural network is used as a current prediction model.

[0017] Preferably, the neural network is: a recurrent neural network, a long short-term memory network or a gated recurrent unit.

[0018] In a second aspect, the present invention provides a self-detection system for a current balancing circuit, the system comprising:

[0019] A plurality of switching power supplies, wherein the plurality of switching power supplies are connected in parallel;

[0020] The current balancing module is electrically connected to the plurality of switching power supplies respectively and is used to adjust the output current of each switching power supply;

[0021] A control module, wherein the control module has a plurality of control terminals, each of which is connected in series between a corresponding switching power supply and a current balancing module; the control module is used to implement the self-detection method of the current balancing circuit described above;

[0022] The current acquisition module is used to respectively acquire the output currents of a plurality of switch power supplies, and the current acquisition module is electrically connected to the control module.

[0023] Preferably, the current balancing module comprises: a current balancing bus and a plurality of current balancing circuits, each of which comprises: a current sampling and amplifying unit, an error amplifying unit and a voltage amplifying unit;

[0024] In each group of current sharing circuits, the error amplification unit has two input terminals, a first input terminal of the error amplification unit is electrically connected to the current sharing bus, a second input terminal of the error amplification unit is electrically connected to the output terminal of the current sampling amplification unit, a sampling terminal of the current sampling amplification unit is electrically connected to the output terminal of the corresponding switch unit, an output terminal of the error amplification unit is electrically connected to the input terminal of the voltage amplification unit, and an output terminal of the voltage amplification unit is electrically connected to the voltage control signal input terminal of the corresponding switch power supply; a control terminal of the control module is connected in series between the current sharing bus and the first input terminal of the error amplification unit.

[0025] Preferably, the current sampling and amplifying unit comprises: an amplifier U1, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C2;

[0026] The non-inverting input terminal of the amplifier U1 is electrically connected to the first end of the resistor R5 and the first end of the resistor R6 respectively, and the second end of the resistor R6 is electrically connected to the first end of the capacitor C2;

[0027] The inverting input terminal of the amplifier U1 is electrically connected to the first end of the resistor R7 and the first end of the resistor R8 respectively, the second end of the resistor R7 is electrically connected to the second end of the capacitor C2, and the second end of the resistor R8 is electrically connected to the output terminal of the amplifier U1;

[0028] The first end and the second end of the capacitor C2 are used as sampling ends of the current sampling and amplifying unit, the first end of the capacitor C2 is electrically connected to the positive electrode of the corresponding switching power supply, and the second end of the capacitor C2 is electrically connected to the negative electrode of the corresponding switching power supply; the output end of the amplifier U1 is used as the output end of the current sampling and amplifying unit.

[0029] Preferably, the current acquisition module includes multiple first Hall sensors and one second Hall sensor, each first Hall sensor is used to detect the output current of the corresponding switching power supply in real time, and the second Hall sensor is used to detect the current sharing current on the current sharing bus in real time.

[0030] Preferably, the error amplification unit includes: an amplifier U2, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, and a capacitor C7;

[0031] The non-inverting input terminal of the amplifier U2 is electrically connected to the first end of the capacitor C3, the first end of the resistor R9, and the first end of the resistor R10, respectively. The second end of the resistor R10 is electrically connected to the positive electrode of the capacitor C4 and the first end of the resistor R11, respectively.

[0032] The inverting input terminal of the amplifier U2 is electrically connected to the first end of the resistor R12, the first end of the capacitor C6 and the first end of the resistor R13 respectively, and the second end of the resistor R12 is electrically connected to the second end of the resistor R11 and the first end of the capacitor C5 respectively;

[0033] The output end of the amplifier U2 is electrically connected to the second end of the capacitor C6, the second end of the resistor R13 and the first end of the resistor R14 respectively, and the second end of the resistor R14 is electrically connected to the first end of the capacitor C7 and the first end of the resistor R15 respectively;

[0034] The second end of the resistor R9, the second end of the capacitor C3, the second end of the capacitor C4, the second end of the capacitor C5, the second end of the capacitor C7 and the second end of the resistor R15 are all grounded;

[0035] The first end of the resistor R11 is used as the first input end of the error amplifying unit, the second end of the resistor R11 is used as the second input end of the error amplifying unit, and the second end of the resistor R14 is used as the output end of the error amplifying unit.

[0036] Preferably, the control module comprises: a controller and a plurality of control circuits, wherein a controlled end of each control circuit is electrically connected to a control output end of the controller;

[0037] Each control circuit includes: a relay T1, a diode D1, a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1;

[0038] A contact switch of the relay T1 is used as a control end of the control module, a first end of the contact switch of the relay T1 is electrically connected to the current sharing bus, and a second end of the contact switch of the relay T1 is electrically connected to a first input end of the error amplification unit;

[0039] The positive electrode of the power supply of the relay T1 and the negative electrode of the diode D1 are both connected to the power supply, and the negative electrode of the power supply of the relay T1 is electrically connected to the positive electrode of the diode D1 and the collector of the transistor Q1 respectively;

[0040] The base of the transistor Q1 is electrically connected to the first end of the resistor R1, the first end of the resistor R2 and the collector of the transistor Q2 respectively, the second end of the resistor R1 is connected to the power supply, and the second end of the resistor R2 and the emitter of the transistor Q1 are both grounded;

[0041] The base of the transistor Q2 is electrically connected to the first end of the resistor R3, the first end of the resistor R4 and the first end of the capacitor C1 respectively, the second end of the resistor R3 serves as the controlled end of the control circuit, the second end of the resistor R3 is electrically connected to the control output end of the controller, and the second end of the resistor R4, the second end of the capacitor C1 and the emitter of the transistor Q2 are all grounded.

[0042] Beneficial effects:

[0043] The present invention monitors the real-time working parameters of each switching power supply, and then uses the current prediction model to predict the current of each switching power supply in the future time period to obtain a current prediction value. By analyzing the current prediction value, the current fluctuation of each switching power supply in the future time period can be determined to judge whether each switching power supply will appear in the future time period. When any switching power supply is abnormal, the generation time of the cut-off signal of the switching power supply is determined, and the switching power supply with the abnormality is quickly cut off at the generation time, so that the faulty switching power supply is removed from the current balancing circuit to avoid affecting the current balancing circuit, but the entire current balancing circuit system fails; therefore, the current balancing circuit of the present invention has high stability and good practicality and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0045] Figure 1 is a flow chart of a self-detection method of a current sharing circuit provided in one embodiment of the present invention;

[0046] Figure 2 is a block diagram of a self-detection system for a current sharing circuit provided in one embodiment of the present invention;

[0047] Figure 3 It is a circuit schematic diagram of a current sampling amplification unit and an error amplification unit provided in one embodiment of the present invention;

[0048] Figure 4 It is a schematic diagram of a control module provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0050] Embodiment 1

[0051] Figure 1 FIG. 1 is a flow chart of a self-detection method for a current sharing circuit provided in one embodiment of the present invention. Figure 1 As shown, this embodiment provides a self-detection method for a current balancing circuit, the method is applied to a self-detection system, the self-detection system includes: a plurality of switching power supplies, a current balancing module and a control module, the plurality of switching power supplies are connected in parallel, the plurality of switching power supplies are electrically connected to the current balancing module, the control module has a plurality of control terminals, each control terminal is connected in series between the corresponding switching power supply and the current balancing module, each control terminal of the control module is used to output a cut-off signal, the cut-off signal is used to cut off the connection between the switching power supply and the current balancing module; the method includes:

[0052] Step S10: acquiring real-time operating parameters of each switching power supply, wherein the real-time operating parameters at least include: output current, input voltage and operating temperature.

[0053] In this embodiment, the operating temperature can be collected in real time by using a temperature sensor, and the output current and input voltage can be collected in real time by using a Hall sensor.

[0054] Step S20: inputting the input voltage and the operating temperature in the real-time operating parameters into a pre-built current prediction model to predict the current prediction value of each switching power supply in the future period.

[0055] In this embodiment, when the switching power supply is actually running, the output current of the switching power supply may fluctuate or decrease due to factors such as damage or partial damage of the internal power switching device (such as MOSFET or IGBT), failure of the feedback control loop of the power supply, problems with the oscillator or control circuit, and aging or failure of the inductor or capacitor.

[0056] Secondly, the switching power supply has an overheat protection function. When the temperature is too high, the power supply will automatically reduce the output or completely stop the output to protect the circuit, which will cause the output current to fluctuate or decrease; and the input voltage of the switching power supply is too low or fluctuates greatly, which will also affect the output capacity of the switching power supply, causing the output current to fluctuate or decrease.

[0057] Therefore, this embodiment collects historical relevant data of the switching power supply during operation, such as historical operating parameters such as historical output current, historical operating temperature, historical input voltage, etc., to establish a nonlinear mapping relationship between historical operating temperature and historical input voltage and historical output current. Specifically, the method further includes: constructing a current prediction model, including:

[0058] Step a10: obtaining historical operating parameters of the switching power supply, and constructing training samples based on the historical operating parameters of the switching power supply;

[0059] Step a20: training the neural network with training samples until the neural network converges to obtain a trained neural network, and using the trained neural network as a current prediction model; wherein the neural network is: a recurrent neural network, a long short-term memory network or a gated recurrent unit.

[0060] Therefore, by monitoring the real-time operating parameters of each switching power supply in real time, and then inputting the input voltage and operating temperature in the real-time operating parameters into the current prediction model, the current prediction model can predict the current prediction value of each switching power supply in the future period.

[0061] Step S30: Determine the current fluctuation of each switching power supply in the future period according to the output current in the real-time working parameter and the current prediction value in the future period.

[0062] Step S40: when the current fluctuation of any switching power supply in the future period meets the preset condition, determine the cut-off time of the switching power supply, and generate a cut-off signal of the switching power supply at the cut-off time.

[0063] In this embodiment, the preset condition is: the amplitude of the current fluctuation in the future time period exceeds the preset amplitude for a preset number of times, and the preset number of times is determined by the predicted total number of future time periods.

[0064] In this embodiment, the future time period is divided into multiple time points, for example, every 0.1s is divided into a time point, and the future time period is 1min~2min. Taking 1min as an example, there are 600 time points at this time, and each time point corresponds to a current prediction value. The difference between the current prediction value and the current output current is used as the fluctuation value. At this time, there are 600 fluctuation values. When more than 20% of the 600 fluctuation values ​​of any switching power supply exceed the preset amplitude, it means that within the next 1min, the output current of the switching power supply will fluctuate greatly, and the switching power supply needs to be cut off.

[0065] In this embodiment, the preset condition may also be: within a period of time, the amplitude of the current fluctuation continues to increase (continuously increase or increase at intervals), indicating that in the future period, the quality of the output current of the switching power supply will gradually deteriorate, and the switching power supply also needs to be cut off.

[0066] In this embodiment, the preset condition may also be: in the future time period, the size of the fluctuation value exceeding the preset amplitude remains constant and occurs at intervals of a certain period of time. If the duration of the interval is gradually shortening, it also means that the quality of the output current of the switching power supply will gradually deteriorate, and the switching power supply also needs to be cut off.

[0067] In this embodiment, when the current fluctuation in the future time period meets the above conditions, the moment when the amplitude of the current fluctuation exceeds the preset amplitude for the first time is used as the cut-off moment, and a cut-off signal is generated at the same time.

[0068] The present invention monitors the real-time working parameters of each switching power supply, and then uses the current prediction model to predict the current of each switching power supply in the future time period to obtain a current prediction value. By analyzing the current prediction value, the current fluctuation of each switching power supply in the future time period can be determined to judge whether each switching power supply will appear in the future time period. When any switching power supply is abnormal, the generation time of the cut-off signal of the switching power supply is determined, and the switching power supply with the abnormality is quickly cut off at the generation time, so that the faulty switching power supply is removed from the current balancing circuit to avoid affecting the current balancing circuit, but the entire current balancing circuit system fails; therefore, the current balancing circuit of the present invention has high stability and good practicality and reliability.

[0069] Embodiment 2

[0070] Figure 2 FIG. 1 is a circuit schematic diagram of a self-detection system for a current sharing circuit provided in an embodiment of the present invention. Figure 2 As shown, this embodiment provides a self-detection system for a current balancing circuit, the system comprising: a plurality of switch power supplies, a current balancing module, a control module and a current acquisition module;

[0071] Wherein, the multiple switching power supplies are connected in parallel, the current balancing modules are electrically connected to the multiple switching power supplies respectively, and the current balancing modules are used to adjust the output current of each switching power supply;

[0072] The control module has a plurality of control terminals, each of which is connected in series between a corresponding switch power supply and a current balancing module; the control module is used to implement the self-detection method of the current balancing circuit of the first embodiment;

[0073] The current acquisition module is used to respectively acquire the output currents of a plurality of switch power supplies, and the current acquisition module is electrically connected to the control module.

[0074] In this embodiment, when any switching power supply has an abnormality, at this time, after the control module generates a cut-off time and a cut-off signal, the control module outputs a cut-off signal at the cut-off time to cut off the connection between the switching power supply and the current balancing module, so that the switching power supply is separated from the current balancing module and does not participate in current balancing, thereby avoiding affecting the current balancing circuit, but causing the entire current balancing circuit system to fail.

[0075] As a further optimization of this embodiment, the current balancing module includes: a current balancing bus and multiple groups of current balancing circuits, each group of current balancing circuits includes: a current sampling amplification unit, an error amplification unit and a voltage amplification unit;

[0076] In each current sharing circuit, if Figure 3 As shown, the error amplification unit has two input terminals, a first input terminal of the error amplification unit is electrically connected to the current sharing bus, a second input terminal of the error amplification unit is electrically connected to the output terminal of the current sampling amplification unit, a sampling terminal of the current sampling amplification unit is electrically connected to the output terminal of the corresponding switch unit, an output terminal of the error amplification unit is electrically connected to the input terminal of the voltage amplification unit, and an output terminal of the voltage amplification unit is electrically connected to the voltage control signal input terminal of the corresponding switch power supply; a control terminal of the control module is connected in series between the current sharing bus and the first input terminal of the error amplification unit.

[0077] As a further optimization of this embodiment, the current sampling and amplifying unit includes: an amplifier U1, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C2;

[0078] The non-inverting input terminal of the amplifier U1 is electrically connected to the first end of the resistor R5 and the first end of the resistor R6 respectively, and the second end of the resistor R6 is electrically connected to the first end of the capacitor C2;

[0079] The inverting input terminal of the amplifier U1 is electrically connected to the first end of the resistor R7 and the first end of the resistor R8 respectively, the second end of the resistor R7 is electrically connected to the second end of the capacitor C2, and the second end of the resistor R8 is electrically connected to the output terminal of the amplifier U1;

[0080] The first end and the second end of the capacitor C2 are used as sampling ends of the current sampling and amplifying unit, the first end of the capacitor C2 is electrically connected to the positive electrode of the corresponding switching power supply, and the second end of the capacitor C2 is electrically connected to the negative electrode of the corresponding switching power supply; the output end of the amplifier U1 is used as the output end of the current sampling and amplifying unit.

[0081] As a further optimization of this embodiment, the current acquisition module includes multiple first Hall sensors and one second Hall sensor, each first Hall sensor is used to detect the output current of the corresponding switching power supply in real time, and the second Hall sensor is used to detect the current sharing current on the current sharing bus in real time.

[0082] As a further optimization of this embodiment, the error amplification unit includes: an amplifier U2, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, and a capacitor C7;

[0083] The non-inverting input terminal of the amplifier U2 is electrically connected to the first end of the capacitor C3, the first end of the resistor R9, and the first end of the resistor R10, respectively. The second end of the resistor R10 is electrically connected to the positive electrode of the capacitor C4 and the first end of the resistor R11, respectively.

[0084] The inverting input terminal of the amplifier U2 is electrically connected to the first end of the resistor R12, the first end of the capacitor C6 and the first end of the resistor R13 respectively, and the second end of the resistor R12 is electrically connected to the second end of the resistor R11 and the first end of the capacitor C5 respectively;

[0085] The output end of the amplifier U2 is electrically connected to the second end of the capacitor C6, the second end of the resistor R13 and the first end of the resistor R14 respectively, and the second end of the resistor R14 is electrically connected to the first end of the capacitor C7 and the first end of the resistor R15 respectively;

[0086] The second end of the resistor R9, the second end of the capacitor C3, the second end of the capacitor C4, the second end of the capacitor C5, the second end of the capacitor C7 and the second end of the resistor R15 are all grounded;

[0087] The first end of the resistor R11 is used as the first input end of the error amplifying unit, the second end of the resistor R11 is used as the second input end of the error amplifying unit, and the second end of the resistor R14 is used as the output end of the error amplifying unit.

[0088] As a further optimization of this embodiment, the control module includes: a controller U0 and a multi-channel control circuit, and a controlled end of each control circuit is electrically connected to a control output end of the controller U0; wherein the controller U0 may adopt a single-chip microcomputer of the STM32 series;

[0089] like Figure 4 As shown, each control circuit includes: a relay T1, a diode D1, a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1;

[0090] The contact switch of the relay T1 is used as a control end of the control module, the first end of the contact switch k1-1 of the relay T1 is electrically connected to the current sharing bus, and the second end of the contact switch k1-1 of the relay T1 is electrically connected to the first input end of the error amplification unit; wherein the contact switch k1-1 is a double-pole double-throw switch, and is a normally open structure, the third end of the contact switch k1-1 of the relay T1 is connected to the current sharing bus, and the fourth end of the contact switch k1-1 of the relay T1 is connected to a resistor R16, and one end of the resistor R16 is grounded;

[0091] The positive electrode of the power supply of the relay T1 and the negative electrode of the diode D1 are both connected to the power supply, and the negative electrode of the power supply of the relay T1 is electrically connected to the positive electrode of the diode D1 and the collector of the transistor Q1 respectively;

[0092] The base of the transistor Q1 is electrically connected to the first end of the resistor R1, the first end of the resistor R2 and the collector of the transistor Q2 respectively, the second end of the resistor R1 is connected to the power supply, and the second end of the resistor R2 and the emitter of the transistor Q1 are both grounded;

[0093] The base of the transistor Q2 is electrically connected to the first end of the resistor R3, the first end of the resistor R4 and the first end of the capacitor C1 respectively, the second end of the resistor R3 serves as the controlled end of the control circuit, the second end of the resistor R3 is electrically connected to the control output end of the controller U0, and the second end of the resistor R4, the second end of the capacitor C1 and the emitter of the transistor Q2 are all grounded.

[0094] for Figure 3 and Figure 4 , Figure 3 There is only one switching power supply in the Figure 4 It is a control circuit corresponding to the switching power supply; when the switching power supply is not abnormal, the controller U0 outputs a low level, the transistor Q2 is not turned on, and since the second end of the resistor R1 is connected to the power supply, the base of the transistor Q1 is at a high level at this time, the transistor Q1 is turned on, the coil of the relay T1 is energized, and the contact switch k1-1 of the relay T1 changes from normally open to normally closed, and the switching power supply is connected to the DC bus to participate in current sharing.

[0095] When the current fluctuation of the switching power supply in the future period is abnormal (that is, the preset conditions are met), the controller U0 outputs a high level. At this time, the base of the transistor Q2 is at a high level, and the transistor Q2 is turned on, which will change the base of the transistor Q1 from a high level to a low level, and the transistor Q1 changes from being turned on to being blocked. At this time, the coil of the relay T1 is disconnected from the power supply, and the contact switch k1-1 of the relay T1 is restored from the normally closed state to the normally open state, and the switching power supply is disconnected from the DC bus, and the switching power supply does not participate in current sharing.

[0096] Therefore, the circuit structure of the current balancing module and the control module of the present invention has well realized the improvement of the average value automatic current balancing method, overcome its inherent shortcomings, increased the practicality of the average value method, has a simple circuit structure and low cost, and reduces the production cost of the power module.

[0097] The present invention monitors the real-time working parameters of each switching power supply, and then uses the current prediction model to predict the current of each switching power supply in the future time period to obtain a current prediction value. By analyzing the current prediction value, the current fluctuation of each switching power supply in the future time period can be determined to judge whether each switching power supply will appear in the future time period. When any switching power supply is abnormal, the generation time of the cut-off signal of the switching power supply is determined, and the switching power supply with the abnormality is quickly cut off at the generation time, so that the faulty switching power supply is removed from the current balancing circuit to avoid affecting the current balancing circuit, but the entire current balancing circuit system fails; therefore, the current balancing circuit of the present invention has high stability and good practicality and reliability.

[0098] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0099] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0100] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A self-detection method for a current sharing circuit, characterized in that: The method is applied to a self-detection system, which includes: a plurality of switching power supplies, a current balancing module and a control module, wherein the plurality of switching power supplies are connected in parallel, and the plurality of switching power supplies are electrically connected to the current balancing module, and the control module has a plurality of control terminals, each of which is connected in series between the corresponding switching power supply and the current balancing module, and each of the control terminals of the control module is used to output a cut-off signal, and the cut-off signal is used to cut off the connection between the switching power supply and the current balancing module; the method includes: Acquire real-time operating parameters of each switching power supply, wherein the real-time operating parameters include at least: output current, input voltage and operating temperature; Inputting input voltage and operating temperature in real-time operating parameters into a pre-built current prediction model to predict the current prediction value of each switching power supply in a future period; Determine the current fluctuation of each switching power supply in the future period according to the output current in the real-time working parameters and the current prediction value in the future period; When the current fluctuation of any switching power supply in a future time period meets the preset conditions, the cut-off time of the switching power supply is determined, and a cut-off signal of the switching power supply is generated at the cut-off time; wherein the preset conditions are: the amplitude of the current fluctuation in the future time period exceeds the preset amplitude for a preset number of times, and the preset number of times is determined by the predicted total number of future time periods; or within a period of time, the amplitude of the current fluctuation continues to increase; or in the future time period, the size of the fluctuation value exceeding the preset amplitude remains constant, occurs at intervals of a period of time, and the duration of the interval is gradually shortened.

2. The self-detection method of the current balancing circuit according to claim 1, characterized in that: The method further includes: constructing a current prediction model, including: Acquire historical operating parameters of the switching power supply, and construct training samples based on the historical operating parameters of the switching power supply; The neural network is trained with the training samples until the neural network converges to obtain a trained neural network, and the trained neural network is used as a current prediction model.

3. The self-detection method of the current balancing circuit according to claim 2, characterized in that: The neural network is: a recurrent neural network, a long short-term memory network or a gated recurrent unit.

4. A self-detection system for a current sharing circuit, characterized in that: The system comprises: A plurality of switching power supplies, wherein the plurality of switching power supplies are connected in parallel; The current balancing module is electrically connected to the plurality of switching power supplies respectively and is used to adjust the output current of each switching power supply; A control module, wherein the control module has a plurality of control terminals, each of which is connected in series between a corresponding switching power supply and a current balancing module; the control module is used to implement the self-detection method of the current balancing circuit according to any one of claims 1 to 3; The current acquisition module is used to respectively acquire the output currents of a plurality of switch power supplies, and the current acquisition module is electrically connected to the control module.

5. The self-detection system of the current balancing circuit according to claim 4, characterized in that: The current balancing module comprises: a current balancing bus and a plurality of current balancing circuits, each of which comprises: a current sampling amplification unit, an error amplification unit and a voltage amplification unit; In each group of current sharing circuits, the error amplification unit has two input terminals, a first input terminal of the error amplification unit is electrically connected to the current sharing bus, a second input terminal of the error amplification unit is electrically connected to the output terminal of the current sampling amplification unit, a sampling terminal of the current sampling amplification unit is electrically connected to the output terminal of the corresponding switch unit, an output terminal of the error amplification unit is electrically connected to the input terminal of the voltage amplification unit, and an output terminal of the voltage amplification unit is electrically connected to the voltage control signal input terminal of the corresponding switch power supply; a control terminal of the control module is connected in series between the current sharing bus and the first input terminal of the error amplification unit.

6. The self-detection system of the current balancing circuit according to claim 5, characterized in that: The current acquisition module includes a plurality of first Hall sensors and one second Hall sensor, each first Hall sensor is used to detect the output current of the corresponding switching power supply in real time, and the second Hall sensor is used to detect the current sharing current on the current sharing bus in real time.

7. The self-detection system of the current balancing circuit according to claim 5, characterized in that: The current sampling and amplifying unit includes: an amplifier U1, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C2; The non-inverting input terminal of the amplifier U1 is electrically connected to the first end of the resistor R5 and the first end of the resistor R6 respectively, and the second end of the resistor R6 is electrically connected to the first end of the capacitor C2; The inverting input terminal of the amplifier U1 is electrically connected to the first end of the resistor R7 and the first end of the resistor R8 respectively, the second end of the resistor R7 is electrically connected to the second end of the capacitor C2, and the second end of the resistor R8 is electrically connected to the output terminal of the amplifier U1; The first end and the second end of the capacitor C2 are used as sampling ends of the current sampling and amplifying unit, the first end of the capacitor C2 is electrically connected to the positive electrode of the corresponding switching power supply, and the second end of the capacitor C2 is electrically connected to the negative electrode of the corresponding switching power supply; the output end of the amplifier U1 is used as the output end of the current sampling and amplifying unit.

8. The self-detection system of the current balancing circuit according to claim 5, characterized in that: The error amplification unit includes: an amplifier U2, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, and a capacitor C7; The non-inverting input terminal of the amplifier U2 is electrically connected to the first end of the capacitor C3, the first end of the resistor R9, and the first end of the resistor R10, respectively. The second end of the resistor R10 is electrically connected to the positive electrode of the capacitor C4 and the first end of the resistor R11, respectively. The inverting input terminal of the amplifier U2 is electrically connected to the first end of the resistor R12, the first end of the capacitor C6 and the first end of the resistor R13 respectively, and the second end of the resistor R12 is electrically connected to the second end of the resistor R11 and the first end of the capacitor C5 respectively; The output end of the amplifier U2 is electrically connected to the second end of the capacitor C6, the second end of the resistor R13 and the first end of the resistor R14 respectively, and the second end of the resistor R14 is electrically connected to the first end of the capacitor C7 and the first end of the resistor R15 respectively; The second end of the resistor R9, the second end of the capacitor C3, the second end of the capacitor C4, the second end of the capacitor C5, the second end of the capacitor C7 and the second end of the resistor R15 are all grounded; The first end of the resistor R11 is used as the first input end of the error amplifying unit, the second end of the resistor R11 is used as the second input end of the error amplifying unit, and the second end of the resistor R14 is used as the output end of the error amplifying unit.

9. The self-detection system of the current balancing circuit according to claim 5, characterized in that: The control module comprises: a controller and a multi-channel control circuit, wherein a controlled end of each channel of the control circuit is electrically connected to a control output end of the controller; Each control circuit includes: a relay T1, a diode D1, a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1; A contact switch of the relay T1 is used as a control end of the control module, a first end of the contact switch of the relay T1 is electrically connected to the current sharing bus, and a second end of the contact switch of the relay T1 is electrically connected to a first input end of the error amplification unit; The positive electrode of the power supply of the relay T1 and the negative electrode of the diode D1 are both connected to the power supply, and the negative electrode of the power supply of the relay T1 is electrically connected to the positive electrode of the diode D1 and the collector of the transistor Q1 respectively; The base of the transistor Q1 is electrically connected to the first end of the resistor R1, the first end of the resistor R2 and the collector of the transistor Q2 respectively, the second end of the resistor R1 is connected to the power supply, and the second end of the resistor R2 and the emitter of the transistor Q1 are both grounded; The base of the transistor Q2 is electrically connected to the first end of the resistor R3, the first end of the resistor R4 and the first end of the capacitor C1 respectively, the second end of the resistor R3 serves as the controlled end of the control circuit, the second end of the resistor R3 is electrically connected to the control output end of the controller, and the second end of the resistor R4, the second end of the capacitor C1 and the emitter of the transistor Q2 are all grounded.

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