CN-121984147-A - Two-in-one vehicle-mounted charging circuit adopting bidirectional power device

CN121984147ACN 121984147 ACN121984147 ACN 121984147ACN-121984147-A

Abstract

The invention relates to a two-in-one vehicle-mounted charging circuit adopting a bidirectional power device, which comprises a first port side component connected with an external power supply, a second port side component connected with a first energy storage device and a third port side component connected with the second energy storage device, wherein rectifying units of the three port side components are coupled through the same magnetic element, phase shift angles of the second controllable rectifying unit and the third controllable rectifying unit relative to the first controllable rectifying unit are all set to be larger than zero so as to realize that the external power supply charges the first energy storage device and/or the second energy storage device, or the first controllable rectifying unit is turned off, and the phase shift angle of the third controllable rectifying unit relative to the second controllable rectifying unit is set to be larger than zero so as to realize that the first energy storage device charges the second energy storage device. The invention can realize two charging modes through one set of circuit, has high integration level, less controllers and switching devices, small circuit volume, low cost, short energy transmission path and high transmission efficiency.

Inventors

Zhou Xuetong
Mo Zhili
ZHENG LI
CHENG XINHONG

Assignees

中国科学院上海微系统与信息技术研究所

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (8)

1. The two-in-one vehicle-mounted charging circuit adopting the bidirectional power device is characterized by comprising a first port side component connected with an external power supply, a second port side component connected with a first energy storage device and a third port side component connected with a second energy storage device, wherein a first controllable rectifying unit of the first port side component, a second controllable rectifying unit of the second port side component and a third controllable rectifying unit of the third port side component are coupled through the same magnetic element; The first phase shift angle of the switch driving signal of the second controllable rectifying unit relative to the switch driving signal of the first controllable rectifying unit is set to be larger than zero, and the second phase shift angle of the switch driving signal of the third controllable rectifying unit relative to the switch driving signal of the first controllable rectifying unit is set to be larger than zero, so that the external power supply charges the first energy storage device and/or the second energy storage device; Or the first controllable rectifying unit is turned off, and the third phase shift angle of the third controllable rectifying unit switch driving signal relative to the second controllable rectifying unit switch driving signal is set to be larger than zero, so that the first energy storage device charges the second energy storage device.
2. The two-in-one vehicle-mounted charging circuit according to claim 1, wherein when the external power supply is a single-phase power supply, the half-bridge rectifying circuit comprises a first series circuit formed by connecting a first bidirectional power switch and a second bidirectional power switch in series, a second series circuit formed by connecting a first capacitor and a second capacitor in series, and a third series circuit formed by connecting a first inductor and a first winding in series, the first series circuit is connected in parallel with the second series circuit, and two ends of the third series circuit are respectively connected with a midpoint of the first series circuit and a midpoint of the second series circuit.
3. The two-in-one vehicle charging circuit of claim 2, wherein the bi-directional power device is responsive to a first control voltage and a second control voltage: When the first control voltage is set to be more than or equal to 0 and the second control voltage is set to be less than 0, the bidirectional power device is conducted unidirectionally from the first end to the second end; When the first control voltage is set to be smaller than 0 and the second control voltage is set to be larger than or equal to 0, the bidirectional power device is conducted unidirectionally from the second end to the first end; when the first control voltage and the second control voltage are both set to be more than or equal to 0, the bidirectional power device is in bidirectional conduction; when the first control voltage and the second control voltage are both set to be smaller than 0, the bidirectional power device is turned off.
4. The two-in-one vehicle charging circuit of claim 3, wherein the first bi-directional power switch and the second bi-directional power switch are both set to off to effect the turning off of the half-bridge rectifier circuit.
5. The two-in-one vehicle charging circuit of claim 3, wherein the first control voltage of the first bi-directional power switch and the second control voltage of the second bi-directional power switch are both set to be equal to or greater than 0 to achieve one half cycle of rectification of the external power source, and wherein the second control voltage of the first bi-directional power switch and the first control voltage of the second bi-directional power switch are both set to be equal to or greater than 0 to achieve the other half cycle of rectification of the external power source.
6. The two-in-one vehicle-mounted charging circuit according to claim 1, wherein when the external power source is a three-phase power source, the half-bridge rectifying circuit comprises a parallel circuit formed by connecting a first half-bridge rectifying branch, a second half-bridge rectifying branch and a third half-bridge rectifying branch in parallel, and a fourth series circuit formed by connecting a second inductor and a second winding in series, and the fourth series circuit is connected in parallel with the parallel circuit.
7. The two-in-one vehicle charging circuit according to claim 6, wherein each half-bridge rectification branch circuit comprises a fifth series circuit formed by connecting a third bidirectional power switch and a fourth bidirectional power switch in series, and a third capacitor and a third inductor, wherein two ends of the third capacitor are respectively connected with a midpoint of the fifth series circuit and one end of an external power supply, and two ends of the third inductor are respectively connected with a midpoint of the fifth series circuit and the other end of the external power supply.
8. The two-in-one vehicle charging circuit of claim 1, wherein the second controllable rectifying unit and the third controllable rectifying unit each comprise a full bridge rectifying circuit.

Description

Two-in-one vehicle-mounted charging circuit adopting bidirectional power device Technical Field The invention relates to the technical field of vehicle-mounted charging, in particular to a two-in-one vehicle-mounted charging circuit adopting a bidirectional power device. Background The vehicle-mounted charger is used as a key component for connecting an external power grid with a vehicle power battery, its performance is critical. Currently, users put forward higher requirements on shortening charging time, improving endurance mileage and prolonging battery life, and the vehicle-mounted charger is directly pushed to develop in the directions of high power density, high efficiency and high integration level. The core of the magnetic coupling type multi-port topology is that a multi-winding transformer is used as a common magnetic coupling element to connect an input (such as a power grid) and a plurality of outputs (such as a high-voltage battery and a low-voltage battery) on the premise of electric isolation. The energy can be directly transmitted between ports through the shared magnetic coupling element, so that the transmission efficiency is higher, and the centralized control system reduces the number of controllers and switching elements and reduces the cost. However, when the multi-port topology operates in a dual-port mode, the original magnetic coupling relationship still exists and some of the energy is transferred to the idle ports. Since most of the currently used switching transistors (Si MOSFET, IGBT, siC MOSFET, gaN HEMT) have the characteristic of reverse freewheeling, energy in the idle ports is consumed in the form of heat, which reduces the transmission efficiency and reliability of the circuit. In order to solve the problem, the existing scheme comprises the steps of firstly, inhibiting the gain of the idle port through a special control strategy, reducing energy loss, and secondly, transmitting the energy received by the idle port to other ports through an extra circuit structure. Although the two schemes can process the energy in the idle port, a complex control strategy or additional circuit cost is required, and still there is a space for optimization. US11594973B2 discloses a three-port DC/DC converter which cannot be directly supplied by the grid, requiring the addition of a stage of AC/DC conversion before port 1, which makes the circuit more complex and introduces additional costs. In addition, the scheme cannot overcome the problem of reverse conduction of the traditional MOSFET when the traditional MOSFET is turned off, and the port 1 needs to be driven by a control signal in a three-port mode or a two-port mode, so that energy loss is increased. Disclosure of Invention The invention aims to solve the technical problem of providing a two-in-one vehicle-mounted charging circuit adopting a bidirectional power device, which can improve charging efficiency, reduce extra loss and solve the problem of energy loss caused by reverse freewheeling of an idle port switch tube. The invention provides a two-in-one vehicle-mounted charging circuit adopting a bidirectional power device, which is characterized by comprising a first port side component connected with an external power supply, a second port side component connected with a first energy storage device and a third port side component connected with a second energy storage device, wherein a first controllable rectifying unit of the first port side component, a second controllable rectifying unit of the second port side component and a third controllable rectifying unit of the third port side component are coupled through the same magnetic element; The first phase shift angle of the second controllable rectifying unit switch driving signal relative to the first controllable rectifying unit switch driving signal is set to be larger than zero, and the second phase shift angle of the third controllable rectifying unit switch driving signal relative to the first controllable rectifying unit switch driving signal is set to be larger than zero, so that the external power supply charges the first energy storage device and/or the second energy storage device; Or the first controllable rectifying unit is turned off, and the third phase shift angle of the third controllable rectifying unit switch driving signal relative to the second controllable rectifying unit switch driving signal is set to be larger than zero, so that the first energy storage device charges the second energy storage device. Further, the first controllable rectifying unit comprises a half-bridge rectifying circuit controlled by a bidirectional power device. Further, when the external power supply is a single-phase power supply, the half-bridge rectification circuit comprises a first series circuit formed by connecting the first bidirectional power switch and the second bidirectional power switch in series, a second series circuit formed by connecting the first capacitor and