CN-121077038-B - Super-charging system and control method thereof

CN121077038BCN 121077038 BCN121077038 BCN 121077038BCN-121077038-B

Abstract

The application discloses a super-charging system and a control method thereof, and relates to the technical field of charging. The system comprises a multi-winding transformer, at least two charging modules and at least two charging interfaces, wherein one end of each charging module is correspondingly connected with one secondary winding of the multi-winding transformer, the other end of each charging module is correspondingly connected with at least one charging interface, each charging module comprises a first charging unit, M second charging units, a first switching unit and a second switching unit, one end of each first charging unit is connected with the corresponding secondary winding, the other end of each first charging unit is connected with each charging interface corresponding to the charging module through the first switching unit, the other end of each second charging unit is respectively connected with one charging interface corresponding to the charging module through the second switching unit, the first charging units are of two-stage conversion topology, and the second charging units are of single-stage conversion topology. Therefore, the charging efficiency of the super-charging system is improved.

Inventors

LV JIAN
YUAN QINGMIN
ZHOU QIANG

Assignees

领充新能源科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250829

Claims (10)

1. The super-charging system is characterized by comprising a multi-winding transformer, at least two charging modules and at least two charging interfaces, wherein one end of each charging module is correspondingly connected with one secondary winding of the multi-winding transformer, and the other end of each charging module is correspondingly connected with at least one charging interface; the charging module comprises a first charging unit, M second charging units, a first switching unit and a second switching unit, M is larger than or equal to 1 and is a positive integer, the first charging units and the second charging units are all connected in parallel, one ends of the first charging units and the second charging units are connected with corresponding secondary windings, the other ends of the first charging units are connected with charging interfaces corresponding to the charging module through the first switching units, the other ends of the second charging units are connected with charging interfaces corresponding to the charging module through the second switching units, the first charging units are of two-stage conversion topology, and the second charging units are of single-stage conversion topology.
2. The super-charging system as claimed in claim 1, wherein the first charging unit includes an AC/DC conversion circuit and a DC/DC conversion circuit, and the DC/DC conversion circuit is an isolated type conversion circuit; the second charging unit comprises at least one PCS conversion circuit, and each PCS conversion circuit is connected in parallel.
3. The overcharge system of claim 1, wherein the charge module further comprises a control unit; The control unit is connected with the first charging unit and the first switch unit and used for controlling the first charging unit and the first switch unit to be turned on or turned off; the control unit is also connected with the corresponding second charging unit and the corresponding second switching unit and is used for controlling the corresponding second charging unit and the corresponding second switching unit to be turned on or turned off.
4. The super-charging system according to claim 1, wherein the charging module comprises at least 2 second charging units and at least 1 second switching unit, and the charging module is correspondingly connected with two charging interfaces; and one part of the second charging units are connected with one charging interface through one second switch unit, and the other part of the second charging units are connected with the other charging interface through one second switch unit.
5. The overcharge system of claim 2 wherein the DC/DC conversion circuit is an LLC topology or a BUCK-BOOST topology and the PCS conversion circuit is a T-word three level topology, an I-word three level topology or a T-word two level topology.
6. A control method of a super-charging system, characterized by being applied to the super-charging system as claimed in any one of claims 1 to 5, the method comprising: under the condition of receiving a charging starting instruction, controlling a first charging unit to start, and executing pre-detection on the super-charging system by using the first charging unit; And under the condition that the overcharging system meets the preset condition, controlling the first charging unit and/or each second charging unit to charge the load battery, wherein the preset condition comprises that the pre-detection result of the overcharging system is qualified.
7. The method according to claim 6, wherein the pre-detection includes short-circuit detection, the controlling the first charging unit to start, and performing the pre-detection of the super-charging system with the first charging unit, includes: The first charging unit is controlled to start and output preset voltage, and the first switch unit and each second switch unit maintain an off state; collecting output voltage of the first charging unit, and carrying out short circuit detection on the super-charging system based on the preset voltage and the output voltage; and under the condition that the short circuit detection is completed, controlling the first charging unit to stop, and carrying out voltage relief on the first charging unit.
8. The method according to claim 6, wherein the pre-detection includes a system insulation detection, the controlling the first charging unit to start up, and performing the pre-detection of the super-charging system with the first charging unit, includes: controlling the first switch unit and each second switch unit to be conducted; controlling the first charging unit to be started and output a preset voltage, and executing system insulation detection on the super-charging system; and under the condition that the system insulation detection is completed, controlling the first charging unit to stop, performing voltage discharging on the first charging unit, and controlling the first switching unit and each second switching unit to be turned off.
9. The control method of the super-charging system according to claim 6, wherein the controlling the first charging unit and/or each second charging unit to charge the load battery includes: controlling the first charging unit to start and output a preset starting voltage, and controlling the first switching unit to be conducted so as to charge the load battery by the first charging unit; Controlling each second charging unit to be started, executing insulation detection on each second charging unit, and controlling each second charging unit to stop and performing voltage discharge on each second charging unit under the condition that the insulation detection is completed; and controlling the first charging unit and/or each second charging unit to charge the load battery according to a power distribution strategy.
10. The control method of the super-charging system according to any one of claims 6 to 9, characterized in that after performing pre-detection of the super-charging system with the first charging unit, the method further comprises: Acquiring temperature data of the load battery; and under the condition that the temperature data is lower than a preset temperature, controlling the first charging unit to start and output a target current, wherein the target current is used for heating the load battery.

Description

Super-charging system and control method thereof Technical Field The application relates to the technical field of charging, in particular to a super-charging system and a control method thereof. Background In the technical field of new energy charging, a two-stage power conversion topology is generally adopted as a power module in a charging system, but energy is subjected to multiple conversions in the two-stage power conversion topology to accumulate loss, so that charging efficiency is low. In the charging scenario of heavy-duty vehicles such as heavy trucks and engineering machinery, the charging system is usually required to support the charging requirements of ultra-high voltage and ultra-high power, so that the two-stage power conversion topology is not suitable for the application scenario of ultra-high power. Disclosure of Invention The application mainly aims to provide an overcharging system and a control method thereof so as to improve the charging efficiency of the overcharging system. In order to achieve the above purpose, the present application provides a super-charging system, which comprises a multi-winding transformer, at least two charging modules and at least two charging interfaces, wherein one end of each charging module is correspondingly connected with a secondary winding of the multi-winding transformer, and the other end is correspondingly connected with at least one charging interface; the charging module comprises a first charging unit, M second charging units, a first switching unit and a second switching unit, M is larger than or equal to 1 and is a positive integer, the first charging units and the second charging units are all connected in parallel, one ends of the first charging units and the second charging units are connected with corresponding secondary windings, the other ends of the first charging units are connected with charging interfaces corresponding to the charging module through the first switching units, the other ends of the second charging units are connected with charging interfaces corresponding to the charging module through the second switching units, the first charging units are of two-stage conversion topology, and the second charging units are of single-stage conversion topology. Optionally, the first charging unit comprises an AC/DC conversion circuit and a DC/DC conversion circuit, the DC/DC conversion circuit is an isolated type conversion circuit, and the second charging unit comprises at least one PCS conversion circuit, and the PCS conversion circuits are connected in parallel. Optionally, the charging module further comprises a control unit, wherein the control unit is connected with the first charging unit and the first switch unit and used for controlling the first charging unit and the first switch unit to be turned on or turned off, and the control unit is further connected with the corresponding second charging unit and the corresponding second switch unit and used for controlling the corresponding second charging unit and the corresponding second switch unit to be turned on or turned off. Optionally, the charging module comprises at least 2 second charging units and at least 1 second switching unit, and the charging module is correspondingly connected with two charging interfaces, wherein one part of the second charging units are connected with one charging interface through one second switching unit, and the other part of the second charging units are connected with the other charging interface through one second switching unit. Optionally, the DC/DC conversion circuit is in LLC topology or BUCK-BOOST topology, and the PCS conversion circuit is in T-word three-level topology, I-word three-level topology or T-word two-level topology. In addition, in order to achieve the above purpose, the application further provides a control method of the overcharging system, which is applied to any one of the above overcharging systems, and the method comprises the steps of controlling a first charging unit to start and using the first charging unit to perform pre-detection on the overcharging system under the condition that a start charging instruction is received, and controlling the first charging unit and/or each second charging unit to charge a load battery under the condition that the overcharging system meets a preset condition, wherein the preset condition comprises that the pre-detection result of the overcharging system is qualified. Optionally, the pre-detection comprises short circuit detection, the first charging unit is controlled to start, the pre-detection of the super-charging system is executed by the first charging unit, the pre-detection comprises the steps of controlling the first charging unit to start and output preset voltage, keeping the first switching unit and each second switching unit in an off state, collecting the output voltage of the first charging unit, carrying out the short circuit detection on the super-charging sys