Power supply parallel operation system

Abstract

The utility model discloses a power supply parallel operation system, which comprises n power supply modules and a load end, the n power supply modules are connected to the load end in parallel, a far-end voltage acquisition module is arranged between one power supply module and the load end, the power supply modules are in communication connection, and each power supply module comprises a user input module, a power conversion module, an acquisition module and an MCU (Microprogrammed Control Unit) module. According to the system provided by the utility model, the voltage compensation value Vcom is calculated through the initial voltage stabilization value Vset and the voltage value Vo of the load end, so that the voltage compensation value can be accurately calculated, the voltage is accurately compensated, and the stability and accuracy of the voltage of the load end are ensured. The system can calculate the voltage compensation value in real time, so that the output voltage can be dynamically adjusted to adapt to continuously changing load conditions.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply modulation, in particular to a power supply parallel system. Background Art

[0002] When the output voltage is set to be stable at high power, when a large load current is output, the load current will generate a certain voltage drop on the equivalent resistance of the cable due to the inherent equivalent resistance of the load connection cable. This voltage drop will divide a part of the set output voltage, thereby reducing the voltage reaching the load end, and the voltage at the load end cannot reach the set voltage value, resulting in a significant reduction in the actual use effect. In order to reduce the equivalent resistance of the connecting wire, the conventional system uses copper wire with a larger cross-sectional area, but this will increase the cost. Or the set value is manually set a little larger in advance. For example, workers rely on experience to know that the line resistance voltage drop is about 0.5V. On the basis of the original 10V voltage, 0.5V is added, that is, it is manually set to 10.5V in advance to compensate for the line resistance voltage drop. However, when the load current is relatively small, the load voltage end will increase instead, and the line resistance voltage drop will be small. Therefore, this method of increasing the preset voltage value to compensate for the line resistance voltage drop is unstable and has low reliability.

[0003] As can be seen from the above, the existing system for solving voltage drop has disadvantages. For example, increasing the cross-sectional area of ​​the cable will increase the cost, while manually pre-setting the voltage compensation is unstable and has low reliability. Utility Model Content

[0004] The invention aims to overcome the problem that the solution to voltage drop in the existing power parallel system cannot take both cost and stability into consideration, and to provide a power parallel system.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A power parallel system includes n power supply modules and a load end. The n power supply modules are connected in parallel to the load end to form a power parallel system. A remote voltage acquisition module is provided between a power supply module and the load end. The power supply modules are communicatively connected to each other. The power supply modules include user input, power conversion, acquisition and MCU modules. The user input module sets an initial voltage stabilization value Vset. The power conversion module adjusts the output voltage of the local machine. The acquisition module acquires the voltage at the output end of the local machine. When working, the power supply module connected to the remote voltage acquisition module is set as the host, and the other power supply modules are set as slaves. The remote voltage acquisition module acquires the load end voltage Vo and sends it to the host. The host calculates a voltage compensation value Vcom through the voltage stabilization value Vset and the load end voltage Vo and sends it to the slave. Each power supply module obtains a new voltage stabilization value Vnew by superimposing the voltage compensation value Vcom with the set voltage stabilization value Vset. Its power conversion module adjusts the output voltage in real time to make it consistent with Vnew.

[0007] The system of the present invention calculates the voltage compensation value Vcom through the initial voltage stabilization value Vset and the voltage value Vo at the load end, so that the voltage compensation value can be accurately calculated, and then the voltage can be accurately compensated to ensure the stability and accuracy of the voltage at the load end. Since the system can calculate the voltage compensation value in real time, the output voltage can be dynamically adjusted to adapt to the changing load conditions. It should be noted that the voltage stabilization value Vset of the present invention is set according to the needs of the load end.

[0008] Furthermore, the power supply module is provided with a communication module, and each power supply module is connected via the communication module.

[0009] Furthermore, the MCU module generates a time control signal and an amplitude signal according to a preset voltage regulation value Vset, the power supply module is provided with an inverter circuit, the input end of the inverter circuit is connected to direct current, and the MCU module controls the output end of the inverter circuit to output a pulse current consistent with a preset pulse waveform PWM by sending a time control signal to the inverter circuit.

[0010] Furthermore, the MCU module generates a pulse waveform PWM through a timer.

[0011] Furthermore, the power conversion module includes a transformer circuit, an input end of the transformer circuit is electrically connected to an output end of the inverter circuit, and an output end of the transformer circuit is electrically connected to a load end.

[0012] Further, the user input module is a 485 communication interface, the power supply module is connected to an external host computer through the 485 communication interface, and the initial voltage regulation value Vset is sent by the host computer. In this solution, the power supply module can communicate with the external host computer to facilitate remote control and monitoring.

[0013] Furthermore, the communication module is a CAN bus interface. In this solution, the communication of each power supply module is stable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the power supply module;

[0015] Figure 2 This is a simplified circuit diagram of the power supply module;

[0016] Figure 3 This is the system block diagram of the host;

[0017] Figure 4 This is the system block diagram of the power parallel system. DETAILED DESCRIPTION

[0018] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0019] See also Figure 1-4 As shown, the utility model discloses a power parallel system, including n power supply modules and a load end, wherein the n power supply modules are connected in parallel to the load end to form a power parallel system, wherein a remote voltage acquisition module is provided between a power supply module and the load end, and each power supply module is communicatively connected, and the power supply module comprises a user input, a power conversion, an acquisition and an MCU module, wherein the user input module sets an initial voltage stabilization value Vset, the power conversion module adjusts the output voltage of the local machine, and the acquisition module acquires the voltage at the output end of the local machine, when working, the power supply module connected to the remote voltage acquisition module is set as a host, and the other power supply modules are set as slaves, the remote voltage acquisition module acquires the load end voltage Vo and sends it to the host, the host calculates the voltage compensation value Vcom by the voltage stabilization value Vset and the load end voltage Vo and sends it to the slave, each power supply module obtains a new voltage stabilization value Vnew by superimposing the voltage compensation value Vcom with the set voltage stabilization value Vset, and its power conversion module adjusts the output voltage in real time to make it consistent with Vnew.

[0020] Figure 4 As shown, the system 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 others are the slaves.

[0021] The power supply module is provided with a communication module, and each power supply module is connected via the communication module.

[0022] The above-mentioned MCU module generates a time control signal and an amplitude signal according to a preset voltage stabilization value Vset. The power supply module is provided with an inverter circuit, and the input end of the inverter circuit is connected to direct current. The MCU module controls the output end of the inverter circuit to output a pulse current that matches the preset pulse waveform PWM by sending a time control signal to the inverter circuit.

[0023] The above-mentioned inverter circuit includes a first switch tube PWM1, a second switch tube PWM2, a third switch tube PWM3 and a fourth switch tube PWM4, and the four switch tubes are bridge-connected. The MCU module is respectively configured with signal output interfaces corresponding to the four switch tubes, so that the signal input ends of the four switch tubes are respectively connected to the corresponding signal output interfaces. The MCU module controls the opening time of the four switch tubes to realize the pulse opening time set by the user so that the inverter circuit outputs a current of a preset waveform.

[0024] The power supply module is also provided with a rectifier circuit, the output end of the rectifier circuit is electrically connected to the input end of the inverter circuit, the power supply module receives external alternating current through the input end of the rectifier circuit, modulates it into direct current and outputs it to the inverter circuit. Since the rectifier circuit can adopt an existing rectifier solution, this application will not describe it in detail.

[0025] The above MCU module generates a pulse waveform PWM through a timer.

[0026] The power conversion module comprises a transformer circuit, an input end of the transformer circuit is electrically connected to an output end of an inverter circuit, and an output end of the transformer circuit is electrically connected to a load end.

[0027] The user input module is a 485 communication interface, the power supply module is connected to an external host computer through the 485 communication interface, and the initial voltage regulation value Vset is sent by the host computer. In this solution, the power supply module can communicate with the external host computer to facilitate remote control and monitoring.

[0028] The above communication module is a CAN bus interface. In this solution, the communication of each power supply module is stable and efficient.

[0029] The system of the present invention calculates the voltage compensation value Vcom through the initial voltage stabilization value Vset and the voltage value Vo at the load end, so that the voltage compensation value can be accurately calculated, and then the voltage can be accurately compensated to ensure the stability and accuracy of the voltage at the load end. Since the system can calculate the voltage compensation value in real time, the output voltage can be dynamically adjusted to adapt to the changing load conditions. It should be noted that the voltage stabilization value Vset of the present invention is set according to the needs of the load end.

[0030] 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 power parallel system, comprising n power supply modules and a load end, wherein the n power supply modules are connected in parallel to the load end to form a power parallel system, characterized in that: A remote voltage acquisition module is provided between one of the power supply modules and the load end, and the power supply modules are communicatively connected with each other. The power supply module includes user input, power conversion, acquisition and MCU modules. The user input module sets the initial voltage regulation value Vset, the power conversion module adjusts the output voltage of the local machine, and the acquisition module acquires the voltage at the output end of the local machine. When working, the power supply module connected to the remote voltage acquisition module is set as the host, and the other power supply modules are set as slaves. The remote voltage acquisition module acquires the load end voltage Vo and sends it to the host. The host calculates the voltage compensation value Vcom through the voltage regulation value Vset and the load end voltage Vo and sends it to the slave. Each power supply module obtains a new voltage regulation value Vnew by superimposing the voltage compensation value Vcom with the set Vset, and its power conversion module adjusts the output voltage in real time to make it consistent with Vnew.

2. The system according to claim 1, characterized in that The power supply module is provided with a communication module, and each power supply module is connected via the communication module.

3. The system according to claim 1, characterized in that The MCU module generates a time control signal and an amplitude signal according to a preset voltage stabilization value Vset. The power supply module is provided with an inverter circuit. The input end of the inverter circuit is connected to direct current. The MCU module controls the output end of the inverter circuit to output a pulse current that matches a preset pulse waveform PWM by sending a time control signal to the inverter circuit.

4. The system according to claim 3, characterized in that The MCU module generates a pulse waveform PWM through a timer.

5. The system according to claim 4, characterized in that The power conversion module includes a transformer circuit, an input end of the transformer circuit is electrically connected to an output end of an inverter circuit, and an output end of the transformer circuit is electrically connected to a load end.

6. The system according to claim 5, characterized in that: The user input module is a 485 communication interface, the power supply module is connected to an external host computer through the 485 communication interface, and the initial voltage stabilization value Vset is sent by the host computer.

7. The system according to claim 2, characterized in that: The communication module is a CAN bus interface.

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