Power distribution power supply module for electric vehicle charging pile

Abstract

The invention discloses a power distribution power supply module for an electric vehicle charging pile. The power distribution power supply module comprises an AC / DC module, a relay array, a power supply module control unit, a relay array control unit and a relay state feedback unit, according to the invention, only one AC / DC module (the highest cost part) is needed, the rear end realizes multi-path output expansion through a relatively cheap relay array, and the cost of a high-cost PDU module is saved. The circuit is clear in structure, is mainly composed of relays and control, is much simpler than a complex multi-path DC / DC switching system, and is optimized in size and weight. The power supply module has a flexible distribution function of single-path input and multi-path output, so that the charging efficiency is remarkably improved in a non-full-time full-load application scene; the core control of mutual exclusion and disconnection before connection is simple and clear, is easy to realize and verify, and is high in reliability.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging equipment technology, specifically a power distribution power module for electric vehicle charging piles. Background Technology

[0002] With the increasing popularity of electric vehicles, the demand for charging stations has surged. To improve the utilization rate of charging stations and reduce costs, charging stations supporting multiple charging guns (such as dual-gun, quad-gun, or even more) are becoming more common. There are two main traditional solutions for multi-gun charging:

[0003] Independent AC / DC module solution: Each charging gun is equipped with an independent AC / DC power module. This solution has a simple structure and independent control, but it is expensive, bulky and heavy, relatively inefficient (especially when multiple modules are working simultaneously under light load), and occupies a lot of space.

[0004] High-power AC / DC module + power distribution unit (PDU): This solution uses a high-power AC / DC module to output a high-voltage DC bus, and then distributes the power to each charging gun through a power distribution unit (PDU). This solution is highly efficient, but the PDU structure occupies a large area and the control algorithm is complex (it needs to implement dynamic power distribution and current sharing), so the overall system cost is still high.

[0005] Both of the above solutions suffer from high costs, complex structures, or insufficient efficiency. For certain application scenarios (such as parking lots or fleet management where multiple charging guns need to be connected but the actual simultaneous charging demand is low, or where sequential charging is mainly used), a more economical and simpler solution is needed that can effectively distribute a single power source to multiple charging ports while ensuring safety. Summary of the Invention

[0006] The purpose of this invention is to provide a power distribution module for electric vehicle charging piles to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a power distribution power module for electric vehicle charging piles, comprising an AC / DC module, a relay array, a power module control unit, a relay array control unit, and a relay status feedback unit;

[0008] The AC / DC module is used to convert a three-phase 380V AC input power supply into a high-voltage DC output.

[0009] The relay array is connected to the AC / DC module and is a single-input, multi-output, mutually exclusive relay array.

[0010] The power module control unit includes a microcontroller for controlling the AC / DC module output and a relay array control unit;

[0011] The relay array control unit is used to execute control logic, including relay array drive circuit and mutually exclusive output control logic;

[0012] The relay status feedback unit is used to provide real-time feedback to the control center on the currently active relay array channel number, relay status, and relay sticking or failure status.

[0013] Preferably, the relay array drive circuit includes multiple independent drive channels, each channel is connected to a relay coil, and the relay array drive circuit provides sufficient current or voltage according to the command of the relay array control unit to reliably engage or disengage the corresponding relay.

[0014] Preferably, the mutual exclusion output control logic is embedded in the core program of the relay array control unit, ensuring that at any given time, only one relay is allowed to be engaged.

[0015] Preferably, when the mutual exclusion output control logic receives a charging request, it first ensures that other channels are currently inactive. If there is a channel that is outputting, it waits for it to stop or reject the charging request.

[0016] Preferably, when the channel charging ends (or a fault occurs or manual stop occurs), the relay array control unit immediately drives the relay of this channel to release and disconnect the DC output.

[0017] Preferably, when switching channels, the mutual exclusion output control logic strictly follows the principle of disconnecting before connecting, first completely disconnecting the currently active relay channel, and after a preset safety interval, then activating the next requested relay channel.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention requires only one AC / DC module (the most expensive part), and the backend uses a relatively inexpensive relay array to achieve multi-output expansion, eliminating the cost of a high-cost PDU module. The circuit structure is clear, mainly composed of relays and control logic, which is much simpler than complex multi-channel DC / DC switching systems, and the size and weight are also optimized. The power module has a flexible distribution function of single input and multiple output, which significantly improves charging efficiency in non-full-time full-load application scenarios. The core control of "mutual exclusion" and "break before turn" is simple and clear, easy to implement and verify, and highly reliable. The number of channel relays can be increased to easily expand the number of output channels (such as 12 channels), and it is modularly integrated into the power module. It is perfectly suitable for places that need to connect multiple guns but have low actual simultaneous charging demand, or are mainly used for sequential charging (such as nighttime convoy charging, public parking lots), maximizing equipment utilization and reducing the cost per charging station. Attached Figure Description

[0020] Figure 1 This is a system module diagram of the present invention. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Please see Figure 1 The present invention provides a power distribution power module for electric vehicle charging piles, including an AC / DC module, a relay array, a power module control unit, a relay array control unit, and a relay status feedback unit;

[0023] The AC / DC module is used to convert a three-phase 380V AC input power supply into a high-voltage DC output.

[0024] Specifically, the AC / DC module receives a three-phase 380V AC input power supply and converts the AC power into a high-voltage DC output through its own conversion function, providing DC power for the subsequent relay array;

[0025] The relay array connects to the AC / DC module and is a single-input, multi-output, mutually exclusive relay array.

[0026] Specifically, the relay array is connected to the output terminal of the AC / DC module and is a key component for realizing single-input, multi-channel mutually exclusive output. This relay array consists of multiple relays, each corresponding to one output channel. The activation and deactivation of the relays control the on / off state of the corresponding channel.

[0027] The power module control unit includes a microcontroller for controlling the AC / DC module output and a relay array control unit;

[0028] Specifically, the power module control unit includes a microcontroller with powerful control capabilities. This microcontroller can precisely control the output of the AC / DC module and also issue control commands to the relay array control unit to achieve overall regulation of the entire power module.

[0029] The relay array control unit executes control logic, including a relay array drive circuit and mutual exclusion output control logic. It contains multiple independent drive channels, each connected to a relay coil. The relay array drive circuit provides sufficient current or voltage according to the commands of the relay array control unit to reliably engage or disengage the corresponding relay. The mutual exclusion output control logic is embedded in the core program of the relay array control unit, ensuring that at any given time, only one relay is allowed to engage. When receiving a charging request, the mutual exclusion output control logic first ensures that other channels are currently inactive. If a channel is outputting, it waits for it to stop or rejects the charging request. When a channel finishes charging (or experiences a fault or is manually stopped), the relay array control unit immediately drives the relay of that channel to release, disconnecting the DC output. When switching channels, the mutual exclusion output control logic strictly follows the principle of disconnecting before engaging, first completely disconnecting the currently active relay channel, and after a preset safety interval, engaging the next requested relay channel.

[0030] The relay status feedback unit is used to provide real-time feedback to the control center on the currently active relay array channel number, relay status, and relay sticking or failure status.

[0031] Specifically, the relay status feedback unit can monitor the working status of the relays in real time, including the currently active relay array channel number, the relay's engagement or disengagement status, and whether there is a relay sticking / failure status. This information is fed back to the control center in real time so that the control center can understand the working status of the power module and make corresponding adjustments and processing.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power distribution module for electric vehicle charging piles, characterized in that, Includes AC / DC module, relay array, power module control unit, relay array control unit and relay status feedback unit; The AC / DC module is used to convert a three-phase 380V AC input power supply into a high-voltage DC output. The relay array is connected to the AC / DC module and is a single-input, multi-output, mutually exclusive relay array. The power module control unit includes a microcontroller for controlling the AC / DC module output and a relay array control unit; The relay array control unit is used to execute control logic, including relay array drive circuit and mutually exclusive output control logic; The relay status feedback unit is used to provide real-time feedback to the control center on the currently active relay array channel number, relay status, and relay sticking or failure status.

2. The power distribution module for electric vehicle charging piles according to claim 1, characterized in that: The relay array drive circuit includes multiple independent drive channels, each channel is connected to a relay coil, and the relay array drive circuit provides sufficient current or voltage according to the command of the relay array control unit to reliably engage or disengage the corresponding relay.

3. The power distribution module for electric vehicle charging piles according to claim 1, characterized in that: The mutually exclusive output control logic is embedded in the core program of the relay array control unit, ensuring that at any given time, only one relay is allowed to be engaged.

4. A power distribution module for electric vehicle charging piles according to claim 3, characterized in that: When the mutual exclusion output control logic receives a charging request, it first ensures that other channels are currently inactive. If there is a channel that is outputting, it waits for it to stop or reject the charging request.

5. A power distribution module for electric vehicle charging piles according to claim 4, characterized in that: When the channel charging ends, the relay array control unit immediately drives the relay of this channel to release, disconnecting the DC output.

6. A power distribution module for electric vehicle charging piles according to claim 5, characterized in that: When switching channels, the mutual exclusion output control logic strictly follows the principle of disconnecting before connecting. It first completely disconnects the currently active relay channel and waits for a preset safety interval before connecting the next requested relay channel.

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