Power supply control system based on autonomous competition efficient dynamic current sharing

Abstract

The utility model discloses a power supply control system based on autonomous competition high-efficiency dynamic current sharing, which relates to the field of power supplies and comprises at least two power supply modules used for supplying power to an external load; the external load is used for consuming the electric energy of the power supply module; the CAN bus is used for connecting all the power supply modules, so that all the power supply modules are connected through the CAN bus for data exchange; the beneficial effects of the utility model are that a conventional current-sharing bus is abandoned, parallel current-sharing control is realized based on CAN bus communication, and a user can freely select whether a single power supply module works independently or a plurality of power supply modules output parallel current-sharing work according to the matching condition of the external actual load and the allowable output power of a power supply system. The power supply system is in an optimal working state; the system is simple in structure, easy to implement and good in dynamic performance, and parallel operation current sharing automatic control is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power supply, concretely is a kind of power supply control system based on autonomous competition efficient dynamic current sharing. BACKGROUND

[0002] With the development of science and technology and modernization production, high-power, high-reliability power supply system is widely used in various fields, especially in data center room. To further improve the output power of power module, multiple power modules are usually used in parallel, that is, all parallel power modules are connected through a common current sharing bus and parallel capacity is increased. Under the same power level, the use of multiple power modules in parallel can reduce the current stress of the power semiconductor devices of each power module and improve the reliability of the system. This parallel current sharing power supply mode can use different numbers of power modules in parallel to form different power levels according to actual needs, which can effectively reduce the product types.

[0003] Parallel output of power modules must use parallel current sharing technology to ensure that each module shares equal load current and that there is no phenomenon of some power modules having excessive power and some power modules having insufficient power among the power modules. Otherwise, some parallel power modules operate under light load, some operate under heavy load or even overload, and power modules with low output voltage not only do not supply power to the load, but also become the load of power modules with high output voltage, which unevenly distributes thermal stress and increases the risk of damage, and is easily damaged.

[0004] The traditional current sharing method requires the use of a current bus, and the power module current signal must be connected to the bus, and the bus signal must be transmitted to each power module to perform error amplification with the power module current feedback signal. Generally, the power module current signal is connected to the current bus through a diode or a resistor, and the current bus signal is directly transmitted to the input end of the power module error amplifier. There are multiple common points between power modules, which may form a ground loop current, causing the current sharing loop and even the system to be easily disturbed, thereby degrading the stability of the system, which needs to be improved. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of power supply control system based on autonomous competition efficient dynamic current sharing, to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the utility model provides the following technical scheme:

[0007] A kind of power supply control system based on autonomous competition efficient dynamic current sharing, comprising:

[0008] Power module, for supplying power to external load, and the power module has at least two;

[0009] An external load for consuming the power of the power supply module;

[0010] A CAN bus for connecting all the power supply modules so that all the power supply modules are connected through the CAN bus for data exchange;

[0011] The power supply module is connected with the external load, and the power supply modules are connected through the CAN bus.

[0012] As a further scheme of the utility model: the power supply module comprises:

[0013] A DC power supply unit for supplying DC power to the power supply unit;

[0014] The power supply unit is used for outputting dynamic adjustable DC power to supply the external load;

[0015] The DC power supply unit is connected with the power supply unit.

[0016] As a further scheme of the utility model: the power supply unit comprises:

[0017] A power conversion circuit for converting the power input by the DC power supply unit and outputting the power to the external load;

[0018] A first voltage and current acquisition circuit for acquiring the voltage and current input by the DC power supply unit and outputting the voltage and current to the DSP controller;

[0019] A driving circuit for accepting the control of the DSP controller and driving the power conversion circuit to work;

[0020] A second voltage and current acquisition circuit for acquiring the voltage and current output by the power conversion circuit to the external load and outputting the voltage and current to the DSP controller;

[0021] A DSP controller for comprehensively controlling the working of the power supply unit and communicating with the DSP controllers of other power supply modules through the CAN bus;

[0022] The DSP controller is connected with the driving circuit, the driving circuit is connected with the power conversion circuit, the power conversion circuit is connected with the first voltage and current acquisition circuit and the second voltage and current acquisition circuit, the first voltage and current acquisition circuit is connected with the DSP controller, and the second voltage and current acquisition circuit is connected with the DSP controller.

[0023] As a further scheme of the utility model: the power conversion circuit includes MOS tube QA, MOS tube QB, MOS tube QC, MOS tube QD, the D pole of MOS tube QA is connected with the D pole of MOS tube QC, one end of capacitor CIN, DC power supply unit, the S pole of MOS tube QA is connected with one end of inductor LR, the D pole of MOS tube QB, the S pole of MOS tube QB is connected with the other end of capacitor CIN, the S pole of MOS tube QD, DC power supply unit, the D pole of MOS tube QD is connected with the S pole of MOS tube QC, one end of the input of transformer T, the other end of the input of transformer T is connected with the other end of inductor LR, the first end of the output of transformer T is connected with the positive pole of first diode, the second end of the output of transformer T is connected with the positive pole of second diode, the third end of the output of transformer T is connected with one end of capacitor C0, external load, the negative pole of first diode is connected with the negative pole of second diode, one end of inductor LO, the other end of inductor LO is connected with the other end of capacitor CO, the positive pole of diode DO, the negative pole of diode DO is connected with external load, the G pole of MOS tube QA is connected with drive circuit, the G pole of MOS tube QB is connected with drive circuit, the G pole of MOS tube QC is connected with drive circuit, the G pole of MOS tube QD is connected with drive circuit.

[0024] As a further scheme of the utility model: the power supply unit further includes switch-on and switch-off key, and the switch-on and switch-off key is connected with the DSP controller.

[0025] As a further scheme of the utility model: the power supply unit further includes operation keyboard, and the operation keyboard is connected with the DSP controller.

[0026] Compared with the prior art, the utility model has the advantages that: the utility model discloses abandoning the traditional current-sharing bus and realizing parallel current-sharing control based on CAN bus communication, users can freely select single power module working alone or multiple power module output parallel current-sharing working according to the actual load size and the power system allowed output power matching condition, so that the power system is in the best working condition, and the system has simple structure, easy realization, good dynamic performance and automatic parallel current-sharing control. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a kind of principle diagram of power control system based on autonomous competition efficient dynamic current sharing.

[0028] Figure 2 It is a kind of circuit diagram of power control system based on autonomous competition efficient dynamic current sharing.

[0029] Figure 3 It is the current-sharing control block diagram of power supply unit.

[0030] In the figure: 1 - DC power supply unit, 2 - power supply unit, 3 - external load, 4 - CAN bus, 2-1 - power conversion circuit, 2-2 - first voltage and current acquisition circuit, 2-3 - drive circuit, 2-4 - second voltage and current acquisition circuit, 2-5 - DSP controller, 2-6 - mobile phone APP, 2-7 - power on / off key, 2-8 - operation keyboard. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0032] Please refer to Figure 1 A power supply control system based on autonomous competition efficient dynamic current sharing, comprising:

[0033] The power supply module is used for supplying power for the external load 3, and the power supply module has at least two;

[0034] The external load 3 is used for working to consume the power of the power supply module;

[0035] The CAN bus 4 is used for connecting all the power supply modules, so that all the power supply modules are connected through the CAN bus 4 to exchange data;

[0036] The power supply module is connected with the external load 3, and the power supply modules are connected through the CAN bus 4.

[0037] In the embodiment, please refer to Figure 2 The power supply module comprises:

[0038] The DC power supply unit 1 is used for supplying DC power for the power supply unit 2;

[0039] The power supply unit 2 is used for outputting dynamic adjustable DC power to supply the external load 3;

[0040] The DC power supply unit 1 is connected with the power supply unit.

[0041] The DC power supply unit 1 outputs DC power to supply the power supply unit 2, and the power supply unit outputs after processing to supply the external load 3.

[0042] In the embodiment, please refer to Figure 2 The power supply unit 2 comprises:

[0043] The power conversion circuit 2-1 is used for converting the power input by the DC power supply unit 1 and outputting to the external load 3;

[0044] The first voltage and current collection circuit 2-2 is used to collect the voltage and current inputted by the DC power supply unit 1 and outputted to the DSP controller 2-5.

[0045] The driving circuit 2-3 is used to accept the control of the DSP controller 2-5 and drive the power conversion circuit 2-1 to work.

[0046] The second voltage and current collection circuit 2-4 is used to collect the voltage and current outputted by the power conversion circuit 2-1 to the external load 3 and outputted to the DSP controller 2-5.

[0047] The DSP controller 2-5 is used to comprehensively control the working of the power supply unit and communicate with the DSP controllers 2-5 of other power supply modules through the CAN bus 4.

[0048] The DSP controller 2-5 is connected with the driving circuit 2-3, the driving circuit 2-3 is connected with the power conversion circuit 2-1, the power conversion circuit 2-1 is connected with the first voltage and current collection circuit 2-2 and the second voltage and current collection circuit 2-4, the first voltage and current collection circuit 2-2 is connected with the DSP controller 2-5, and the second voltage and current collection circuit 2-4 is connected with the DSP controller 2-5.

[0049] In the embodiment, please refer to Figure 2 The power conversion circuit 2-1 comprises MOS tubes QA, QB, QC and QD, the D pole of the MOS tube QA is connected with the D pole of the MOS tube QC, one end of the capacitor CIN and the DC power supply unit 1, the S pole of the MOS tube QA is connected with one end of the inductor LR, the D pole of the MOS tube QB, the S pole of the MOS tube QB is connected with the other end of the capacitor CIN, the S pole of the MOS tube QD and the DC power supply unit 1, the D pole of the MOS tube QD is connected with the S pole of the MOS tube QC, one end of the input end of the transformer T, the other end of the input end of the transformer T is connected with the other end of the inductor LR, the first end of the output end of the transformer T is connected with the positive pole of the first diode, the second end of the output end of the transformer T is connected with the positive pole of the second diode, the third end of the output end of the transformer T is connected with one end of the capacitor CO and the external load 3, the negative pole of the first diode is connected with the negative pole of the second diode, one end of the inductor LO, the other end of the inductor LO is connected with the other end of the capacitor CO and the positive pole of the diode DO, the negative pole of the diode DO is connected with the external load 3, the G pole of the MOS tube QA is connected with the driving circuit 2-3, the G pole of the MOS tube QB is connected with the driving circuit 2-3, the G pole of the MOS tube QC is connected with the driving circuit 2-3, and the G pole of the MOS tube QD is connected with the driving circuit 2-3.

[0050] DSP controller 2-5 generates an error Ierr between the sampling signal of the second voltage current acquisition circuit 2-4 as a negative feedback signal Io and the preset single power supply unit 2 theoretical output current value Iavg, Ierr passes through a digital PID operation controller to generate a control amount superimposed on the voltage outer control loop of the DSP controller 2-5, and the driving circuit 2-3 generates a PWM signal to control the on-off time of the four fast power tubes (QA, QB, QC, QD) of the power conversion circuit 2-1, so as to finally realize the adjustment of the output voltage Vo of the power conversion circuit 2-1 to maintain the output current value consistent with the output current of other power supply units 2, realize the output current sharing control effect with good performance, and the output diode Do in the power conversion circuit 2-1 prevents reverse flow and is separated from the output of other power supply units 2.

[0051] In the embodiment, please refer to Figure 2 , the power supply unit 2 further comprises a power-on / off key 2-7, and the power-on / off key 2-7 is connected to the DSP controller 2-5.

[0052] The controller realizes the output power-on / off control of the power supply unit 2 through the power-on / off key 2-7.

[0053] In the embodiment, please refer to Figure 2 , the power supply unit 2 further comprises an operation keyboard 2-8, and the operation keyboard 2-8 is connected to the DSP controller 2-5.

[0054] The controller sets and memorizes the address of the power supply unit 2 through the operation keyboard 2-8, and the address is not lost in power failure, and the addresses of each power supply unit 2 in the power supply system are different; the controller also sets and memorizes the output voltage of the power supply unit 2 through the operation keyboard 2-8, and the output voltage is not lost in power failure.

[0055] The power supply unit 2 is further connected with a mobile phone APP 2-6, receives the signal sent by the mobile phone APP 2-6, constructs communication, and realizes remote monitoring.

[0056] The DSP controller 2-5 collects the input voltage V in , input current I in of the power conversion circuit 2-1 through the first voltage current acquisition circuit 2-2, which is used to detect whether the input voltage of the power supply unit 2 is too high or too low, whether the input current is too high, and to perform input abnormality closing output protection on the power supply unit 2; the DSP controller 2-5 collects the output voltage V Oand output current Io, for detecting whether the output voltage of the power supply unit 2 is too high or too low, or whether the output current is too high, to implement output abnormality shutdown output protection for the power supply unit 2, and more importantly, the DSP controller 2-5 implements output voltage and current double closed loop control using the sampling feedback signals of the output voltage V O and output current Io to realize stable output control of the power supply unit 2.

[0057] Thirdly, the DSP controller 2-5 realizes data information exchange with other power supply units 2 in the power supply system through the CAN bus 4, sends the working status (power supply address, whether powered on, current working current) of the power supply to the CAN bus 4, and also receives the current working status (power supply address, whether powered on, current working current) information sent by other power supply units 2 in the system and stores them respectively. Each power supply unit 2 in the powered-on working state can participate in output parallel current sharing work, and the addresses of the power supply unit 2 and other power supply units 2 in the powered-on working state are sorted using a hash algorithm, wherein the power supply unit 2 with the largest address automatically becomes the master, and other power supply units 2 automatically become slaves. The master calculates the sum of the current data of all power supply units 2 in the powered-on working state and takes the average value Iavg=I all / n, and sends this current average value Iavg to other power supply units 2 in real time, and all power supply units 2 in the powered-on working state take this current average value as the output current reference, thereby realizing output parallel current sharing work of all power supply units 2 in the system in the powered-on working state.

[0058] More specifically, in combination with Figure 3The power supply unit 2 current sharing control block diagram, the DSP controller 2-5 through the second voltage current acquisition circuit 2-4, the power conversion circuit 2-1 output voltage Vo, current signal Io is fed back to the control loop of the power conversion circuit 2-1, namely the DSP controller 2-5 between the output current set reference Iavg and the output current feedback value Io Ierr=Iavg-Io, Ierr passes through the digital PID loop controller to generate the control amount superimposed on the voltage outer control loop of the DSP controller 2-5, namely the current reference Iavg and the feedback current Io, when Iavg is greater than Io, the voltage set value of the power supply unit 2 is lowered through the PID operation, thereby reducing the output current value of the power supply unit 2; when Iavg is less than Io, the voltage set value of the power supply unit 2 is raised through the PID operation, thereby increasing the output current value of the power supply unit 2; when Iavg is equal to Io, the voltage set value of the power supply unit 2 remains unchanged, and finally through the voltage controller and the current controller, four PWM drive signals are generated to control the on and off time of the four power switches of the power conversion circuit 2-1, realizing the real-time dynamic adjustment of the output voltage Vo of the power conversion circuit 2-1, so that the output current Io of the power supply unit 2 is consistent with the average current Iavg. The output control amount of the PID controller is composed of three parts: proportion (P), integral (I) and derivative (D), and its calculation process belongs to the conventional technical means in the art, which will not be described here.

[0059] Thirdly, the power supply unit 2 in the system can freely exit or join the output current sharing control working state of the power supply system due to shutdown or startup. Each time the power supply unit 2 participating in the output current sharing work changes, the power supply unit 2 participating in the current sharing work will again generate a master (the power supply unit 2 with the largest address) through self-competition.

[0060] Thirdly, the user can freely select whether a single power supply unit 2 works alone or multiple power supply units 2 output parallel current sharing work according to the actual load size and the power supply system allowed output power matching, so that the power supply system is in the best working state.

[0061] In order to ensure the reliable operation of the power supply unit 2, the DSP controller 2-5 real-time through the second voltage current acquisition circuit 2-4, the power conversion circuit 2-1 output voltage signal Vo, according to the value of Vo to determine whether the power supply unit 2 is in the output overvoltage or undervoltage state to close the power supply unit 2 output and alarm prompt power supply unit 2 abnormal.

[0062] In order to ensure that the power supply unit 2 starts normally, the DSP controller 2-5 collects the voltage and current of the DC power supply unit 1 through the first voltage and current collection circuit 2-2. Before starting, the DSP controller 2-5 first initializes the parameters of the system, judges whether the input of the DC power supply unit 1 is normal through the first voltage and current collection circuit 2-2, and allows the system to start working only when the input of the DC power supply unit 1 is normal. The model of the DSP controller 2-5 can be TMS320LF2803x, and the DSP controller 2-5 controls the output based on the input signal, which is a common DSP control and does not involve the innovation of the method. The DSP controller 2-5 controls the output based on the input signal, which is a common DSP control and does not involve the innovation of the method.

[0063] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view.

[0064] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A power control system based on autonomous competition high efficiency dynamic current sharing, characterized in that, The power supply control system based on autonomous competition high-efficiency dynamic current sharing comprises: a power module for supplying power to an external load, the power module having at least two; an external load for consuming power from the power module; a CAN bus for connecting all the power modules so that all the power modules are connected through the CAN bus for data exchange; the power module is connected to the external load, and the power modules are connected through the CAN bus; the power module comprises: a direct current power supply unit for supplying direct current to a power supply unit; the power supply unit for outputting dynamic adjustable direct current to supply the external load; the direct current power supply unit is connected to the power supply unit; the power supply unit comprises: a power conversion circuit for converting power input from the direct current power supply unit and outputting to the external load; a first voltage and current acquisition circuit for acquiring voltage and current input from the direct current power supply unit and outputting to a DSP controller; a driving circuit for accepting control of the DSP controller and driving the power conversion circuit to work; a second voltage and current acquisition circuit for acquiring voltage and current output from the power conversion circuit to the external load and outputting to the DSP controller; the DSP controller for comprehensively controlling the power supply unit to work and communicating with DSP controllers of other power modules through the CAN bus; the DSP controller is connected to the driving circuit, the driving circuit is connected to the power conversion circuit, the power conversion circuit is connected to the first voltage and current acquisition circuit and the second voltage and current acquisition circuit, the first voltage and current acquisition circuit is connected to the DSP controller, and the second voltage and current acquisition circuit is connected to the DSP controller.

2. The autonomous competition based high efficiency dynamic current sharing power control system according to claim 1, wherein, The power conversion circuit comprises MOS tubes QA, QB, QC and QD, the D pole of the MOS tube QA is connected to the D pole of the MOS tube QC, one end of a capacitor CIN and a direct current power supply unit, the S pole of the MOS tube QA is connected to one end of an inductor LR, the D pole of the MOS tube QB, the S pole of the MOS tube QB is connected to the other end of the capacitor CIN, the S pole of the MOS tube QD and the direct current power supply unit, the D pole of the MOS tube QD is connected to the S pole of the MOS tube QC and one end of an input end of a transformer T, the other end of the input end of the transformer T is connected to the other end of the inductor LR, the first end of an output end of the transformer T is connected to the positive pole of a first diode, the second end of the output end of the transformer T is connected to the positive pole of a second diode, the third end of the output end of the transformer T is connected to one end of a capacitor C0 and an external load, the negative pole of the first diode is connected to the negative pole of the second diode, one end of an inductor LO, the other end of the inductor LO is connected to the other end of the capacitor C0 and the positive pole of a diode DO, the negative pole of the diode DO is connected to the external load, the G pole of the MOS tube QA is connected to the driving circuit, the G pole of the MOS tube QB is connected to the driving circuit, the G pole of the MOS tube QC is connected to the driving circuit, and the G pole of the MOS tube QD is connected to the driving circuit.

3. The autonomous competition based high efficiency dynamic current sharing power control system according to claim 1, wherein, The power supply unit further comprises a power-on / off key connected to the DSP controller.

4. The autonomous competition based high efficiency dynamic current sharing power control system according to claim 1, wherein, The power supply unit further comprises an operation keyboard connected to the DSP controller.

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