Low-fluctuation power supply parallel operation equipment

Abstract

The utility model discloses a low fluctuation power supply parallel operation equipment, including n power supply modules and load connection terminal, each power supply module includes user input, power conversion, acquisition, CAN communication module and MCU module, the power supply interface of each power supply module is connected with the load connection terminal through a flexible wire, and the power supply modules are in communication connection through a CAN bus. One of the n power supply modules is set as a host, the other power supply modules are set as slaves, and each power supply module adjusts output voltage to enable the voltage to be equal to Vset and collects real-time current data; the slave computer transmits data to the host computer, the host computer receives the data, calculates a current sharing reference and sends the current sharing reference to the slave computer through a bus, and each power supply module calculates and obtains a new voltage stabilization value Vnew according to the current sharing reference and a set Vset. Compared with the prior art, the utility model has the advantages of reducing system oscillation, improving voltage stability and reducing equipment cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply modulation, in particular to a low-fluctuation power supply paralleling device. Background Art

[0002] When high-power parallel operation is performed, the output voltage regulation state is set. When high-power parallel operation is performed, due to the inconsistency of the equivalent resistance of the load connection cable, the inconsistency of the output impedance of the power module in the system increases. When the number of parallel operations is large and there is a delay in communication data processing, coupled with the unbalanced cable resistance, the power supply system will be constantly adjusted, resulting in increased fluctuations in the total power supply and total current of the system, and reducing the system voltage regulation performance. To solve this problem, a current-sharing busbar is often used to reduce the difference in the equivalent resistance of the load connection line of each power module and improve the system current balancing. However, in ultra-high-power parallel equipment, the construction, maintenance and transformation costs of this method are very high. The applicant has found through research that: due to the construction of a high-power parallel system in the form of a current-sharing busbar, it is necessary to preset the corresponding number and length of copper bars according to the actual situation. When the number of power modules is large, the output current is large, and the volume of a single module is large, the output ends of each power module are far apart, resulting in complex parallel busbar design, processing and installation difficulties. In such a large parallel system, even if a parallel busbar is used, there is still a large line resistance imbalance between the power modules at the edge and the power modules in the middle. The only way is to adjust the output parameters of each power module to achieve equal output current between the power modules and stable output of the entire parallel system, which increases the system cost. Summary of the invention

[0003] The invention aims to overcome the problem that the existing power parallel equipment cannot take into account both stability and cost at the same time, and to provide a low-fluctuation power parallel equipment.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A low-fluctuation power parallel device comprises n power supply modules and a load connection terminal, wherein the power supply module comprises a user input, power conversion, acquisition, CAN communication module and an MCU module, wherein the user input module is used to set an initial voltage regulation value Vset, the power conversion module adjusts the power so that the local output voltage is Vset, the acquisition module acquires current data at the local output terminal, the CAN communication module is responsible for data collection and transmission, the MCU module calculates a new voltage regulation value Vset and controls the operation of the device, the power supply interface of each power supply module is connected to the load connection terminal through a flexible wire, and the power supply modules are connected through CAN bus communication. When working, one of the n power supply modules is set as a host, and the rest are set as slaves, each power supply module adjusts the output voltage so that the voltage is equal to Vset, and acquires real-time current data; the slave transmits the data to the host, the host receives the data, calculates a current sharing reference, and sends it to the slave through the bus, and each power supply module obtains a new Vnew based on the current sharing reference and the set Vset.

[0006] Each power supply module of the power parallel device of the utility model adopts CAN bus connection, so that the current data of each power module is summarized into the host, the host uniformly summarizes, calculates the current sharing reference value and sends it to the slave, each power module adjusts the output voltage according to the voltage stabilization value, and each module is independently completed during the adjustment process, that is, the host uniformly calculates the current sharing reference, and the slave uniformly executes the current sharing instruction, without interfering with each other and affecting each other. Compared with the prior art, the utility model has the following advantages: reducing system oscillation, because the host is responsible for summarizing and calculating the bus current, the number of parallel machines and the current sharing value, etc., each slave only needs to work according to the instructions of the host, thereby reducing the error and delay caused by each module calculating and adjusting the current by itself and the system voltage and current oscillation caused by it; improving voltage stability, the host uniformly calculates the current sharing reference and sends it to the slave, the host and each slave adjust the output voltage according to this reference, even if there is a difference in the line equivalent resistance between the modules, it will not affect the voltage stability of the whole machine, therefore, soft wires are used instead of copper bars to build equipment, thereby reducing equipment costs. It should be noted that the soft electric wire of the present invention refers to an electric wire with a certain degree of softness and can be bent and twisted freely, which makes it very convenient during installation and use.

[0007] Furthermore, the user input module is a 485 communication module, and the power supply module is connected to an external host computer via the 485 communication module.

[0008] Furthermore, the user input module is a display control panel.

[0009] Furthermore, it also includes a voltage stabilizing loop module, which uses a voltage loop control method to make the current waveform a set pulse waveform PWM, and the pulse waveform PWM is set according to the voltage stabilizing value Vset.

[0010] Furthermore, the voltage stabilizing loop module includes a bridge switch circuit, the input end of the bridge switch circuit is connected to alternating current, and the output end outputs a pulse current consistent with a pulse waveform PWM.

[0011] Furthermore, the power conversion module includes a voltage conversion circuit, the acquisition module includes a voltage acquisition module, and the voltage acquisition module is electrically connected to the output end of the voltage conversion circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the system block diagram of the power parallel equipment;

[0013] Figure 2 This is the module block diagram of the power supply module;

[0014] Figure 3 This is the circuit schematic diagram of the power supply module. DETAILED DESCRIPTION

[0015] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0016] See also Figure 1-3 As shown, the utility model discloses a low-fluctuation power parallel device, including n power supply modules and a load connection terminal, the power supply module includes user input, power conversion, acquisition, CAN communication module and MCU module, the user input module sets the initial voltage regulation value Vset, the power conversion module adjusts the power so that the local output voltage is Vset, the acquisition module collects the current data of the local output terminal, the CAN communication module is responsible for data collection and transmission, the MCU module calculates the new voltage regulation value Vset and controls the operation of the device, the power supply interface of each power supply module is connected to the load connection terminal through a soft wire, and the power supply modules are connected through CAN bus communication. When working, one of the n power supply modules is set as a host, and the rest are set as slaves. Each power supply module adjusts the output voltage so that the voltage is equal to Vset, and collects real-time current data; the slave transmits the data to the host, the host receives the data and calculates the current sharing reference, and sends it to the slave through the bus, and each power supply module calculates a new Vnew according to the current sharing reference and the set Vset.

[0017] like Figure 1 As shown, the device includes 4 power supply modules, which are named as No. 1, No. 2, No. 3, and No. 4. When working, one of the No. 1-4 machines is selected as the master, and the rest are slaves.

[0018] In one embodiment, the user input module is a 485 communication module, and the power supply module is connected to an external host computer via the 485 communication module.

[0019] In another embodiment, the user input module is a display control panel.

[0020] In one embodiment, a voltage stabilizing loop module is further included. The voltage stabilizing loop module uses a voltage loop control method to make the current waveform a set pulse waveform PWM. The pulse waveform PWM is set according to the voltage stabilizing value Vset.

[0021] In one embodiment, the voltage stabilizing loop module includes a bridge switch circuit, the input end of the bridge switch circuit is connected to alternating current, and the output end outputs a pulse current consistent with a pulse waveform PWM.

[0022] In one embodiment, the power conversion module includes a voltage conversion circuit, and the acquisition module includes a voltage acquisition module, and the voltage acquisition module is electrically connected to the output end of the voltage conversion circuit.

[0023] Each power supply module of the power parallel device of the utility model adopts CAN bus connection, so that the current data of each power module is summarized into the host, the host uniformly summarizes, calculates the current sharing reference value and sends it to the slave, each power module adjusts the output voltage according to the voltage stabilization value Vset, and each module completes the adjustment process independently, that is, the host uniformly calculates the current sharing reference, and the slave uniformly executes the current sharing instruction, without interfering with each other. Compared with the prior art, the utility model has the following advantages: reducing system oscillation, because the host is responsible for summarizing and calculating the bus current, the number of parallel machines and the current sharing value, etc., each slave only needs to work according to the instructions of the host, thereby reducing the voltage and current oscillation of the equipment caused by each module calculating and adjusting the current by itself; improving voltage stability, the host uniformly calculates the current sharing reference and sends it to the slave, the host and each slave adjust the output voltage according to this reference, even if there is a difference in the line equivalent resistance between the modules, it will not affect the voltage stability of the whole machine, therefore, soft wires are used instead of copper bars to build the system, thereby reducing equipment costs.

[0024] According to the disclosure and teaching of the above description, the technical personnel in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A low-fluctuation power parallel device, characterized in that: It includes n power supply modules and a load connection terminal, wherein the power supply module includes a user input, power conversion, acquisition, CAN communication module and an MCU module, wherein the user input module is used to set an initial voltage regulation value Vset, the power conversion module adjusts the power so that the local output voltage is Vset, the acquisition module acquires the current data of the local output terminal, the CAN communication module is responsible for data collection and transmission, the MCU module calculates a new voltage regulation value Vset and controls the operation of the device, the power supply interface of each power supply module is connected to the load connection terminal through a flexible wire, and the power supply modules are connected through a CAN bus communication. When working, one of the n power supply modules is set as a host, and the rest are set as slaves, and each power supply module adjusts the output voltage so that the voltage is equal to Vset, and acquires real-time current data; The slave transmits data to the host, which receives the data, calculates the current sharing reference, and sends it to the slave through the bus. Each power supply module calculates a new voltage regulation value Vnew based on the current sharing reference and the set Vset.

2. The power parallel device according to claim 1, characterized in that: The user input module is a 485 communication module, and the power supply module is connected to an external host computer via the 485 communication module.

3. The power parallel device according to claim 1, characterized in that: The user input module is a display control panel.

4. The power parallel device according to any one of claims 1 to 3, characterized in that: It also includes a voltage stabilizing loop module, which uses a voltage loop control method to make the current waveform at the output end of the power supply module a set pulse waveform PWM, and the pulse waveform PWM is set by a voltage stabilizing value Vset.

5. The power parallel device according to claim 4, characterized in that: The voltage stabilizing loop module comprises a bridge switch circuit, the input end of the bridge switch circuit is connected to alternating current, and the output end outputs a pulse current that conforms to a pulse waveform PWM.

6. The power parallel device according to any one of claims 1 to 3, characterized in that: The power conversion module includes a voltage conversion circuit, and the acquisition module includes a voltage acquisition module. The voltage acquisition module is electrically connected to the output end of the voltage conversion circuit.

Images