A vehicle-mounted integrated electric energy routing topology structure and control method thereof

Abstract

The present invention discloses an in-vehicle integrated power routing topology structure and its control method, belonging to the field of in-vehicle integrated power electronic converters for electric vehicles. The topology structure includes a front-stage flying-capacitor type three-level structure and a rear-stage two-inductor isolation type three-half-bridge structure. The front-stage structure includes power switches S1, S2, S3, S4, S5, S6, a first filter inductor L, a first filter capacitor C, and a flying capacitor C fly ; The rear-stage structure includes a first port, a second port, a third port half-bridge structure, and a three-winding transformer. The front-stage structure uses PWM control to achieve stability in the output of both rectification and inversion modes. The rear-stage structure uses phase-shift control to change the phase-shift angle between the three ports, realizing flexible energy transfer between various modules inside the electric vehicle. The combination of the two realizes power scheduling between in-vehicle devices and the external power grid. The topology structure of the present invention achieves lightweight, can transmit power bidirectionally, and can complete three working modes inside the electric vehicle.

Description

Technical Field

[0001] The invention relates to the field of on-board integrated power electronic converters for electric vehicles, in particular to an on-board integrated electric energy routing topology structure and a control method thereof. Background Art

[0002] As environmental and energy issues become increasingly prominent, vigorously developing clean energy and promoting carbon emission reduction have become the consensus of many countries under the global environmental governance system. Electric vehicles have attracted attention from all walks of life for their green and energy-saving advantages. As the hub connecting the power grid and the battery in the car, various on-board chargers (OBC) have been proposed one after another, but the rapidly developing electric vehicle industry has put forward higher requirements for them.

[0003] The demand for electric vehicle endurance has stimulated the increase in the capacity of internal power batteries, and as battery prices fall and power density increases, this trend will run through all stages of electric vehicle development. The resulting chain reaction is the increase in power battery voltage and the increase in OBC power to ensure charging speed. OBC is no longer satisfied with the 400V system voltage and 3.8kW peak power of early mature technology. The 800V voltage level and 2 and 3 power levels have been applied to new products, and products with higher standards are already in the process of research and development. In addition, the development of autonomous driving technology has put greater pressure on the vehicle's central computing system, and the auxiliary battery system that provides it with power has also achieved rapid development.

[0004] In the future, electric vehicles are developing in the direction of high voltage, high power and integration. Due to the large number of internal modules, high-voltage power batteries, low-voltage auxiliary batteries and charging ports need to have energy flows in different directions when driving and parking to complete the work requirements of the vehicle. The traditional OBC can no longer meet the current situation, and the power routing that can connect multiple different voltage levels and realize flexible energy flow coincides with it. The characteristics of the integrated auxiliary power module also reduce the requirements for communication and volume. Due to the characteristics of electric vehicles, all equipment needs to achieve high power density and low weight as much as possible on the basis of being able to achieve normal functions to ensure the load, speed and energy consumption requirements of electric vehicles. Therefore, it is of great significance to design a lightweight on-board integrated power routing. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a vehicle-mounted integrated power routing topology structure and a control method thereof, which can meet the main working conditions inside the current electric vehicle, control the current or voltage of each port, achieve stable power transmission under different working modes, and on this basis, try to make the whole machine as lightweight as possible.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An on-vehicle integrated power routing topology structure includes a front-stage flying capacitor type three-level structure and a rear-stage two-inductor isolation type three-half-bridge structure;

[0008] The front-stage flying capacitor type three-level structure includes a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a fifth switch tube S5, a sixth switch tube S6, a first filter inductor L, a first filter capacitor C and a flying capacitor C fly The specific connection method is: the drain of the first switch tube S1 is connected to the drain of the third switch tube S3, the source of the first switch tube S1 is connected to the drain of the second switch tube S2 and the first filter inductor L, the source of the second switch tube S2 is connected to the source of the sixth switch tube S6, and the source of the third switch tube S3 is connected to the drain of the fourth switch tube S4 and the flying capacitor C fly The source of the fourth switch tube S4 is connected to the drain of the fifth switch tube S5 and the first filter capacitor C, and the source of the fifth switch tube S5 is connected to the drain of the sixth switch tube S6 and the flying capacitor C fly , the first filter capacitor C is connected to the single-phase AC power grid and the load;

[0009] The rear-stage two-inductor isolation type three-half-bridge structure includes a first-port half-bridge structure, a three-winding transformer, a second-port half-bridge structure and a third-port half-bridge structure;

[0010] The first port half-bridge structure includes a seventh switch tube S a1 , the eighth switch tube S a2 , the first clamping capacitor C a1 , the second clamping capacitor C a2 and the first port filter capacitor C1; the specific connection method is: the seventh switch tube S a1 The drain is connected to the first clamping capacitor C a1 and the first port filter capacitor C1, the seventh switch tube S a1 The source is connected to the eighth switch tube S a2 The drain of the first port transformer winding has the same name as the first port, and the eighth switch tube S a2 The source of the first port is connected to the filter capacitor C1 and the second clamp capacitor C a2 The other end of the first port transformer winding is connected to the first clamping capacitor C a1 and the second clamping capacitor C a2 ;

[0011] The second port half-bridge structure includes a ninth switch tube S b1 , the tenth switch tube S b2 , the third clamping capacitor C b1 , the fourth clamping capacitor Cb2 , the first high frequency chain inductor L b and the second port filter capacitor C2; the specific connection method is: the ninth switch tube S b1 The drain is connected to the third clamp capacitor C b1 and the second port filter capacitor C2, the ninth switch tube S b1 The source is connected to the tenth switch tube S b2 The drain and first high frequency chain inductance L b , the tenth switch tube S b2 The source of the second port is connected to the filter capacitor C2 and the fourth clamping capacitor C b2 The same-name end of the second port transformer winding is connected to the first high-frequency chain inductor L b The other end of the second port transformer winding is connected to the third clamping capacitor C b1 and the fourth clamping capacitor C b2 , the second port filter capacitor C2 is connected to the high-voltage power battery;

[0012] The third port half-bridge structure includes an eleventh switch tube S c1 , the twelfth switch tube S c2 、The fifth clamping capacitor C c1 , the sixth clamping capacitor C c2 , the second high frequency chain inductor L c , the third port filter capacitor C3 and the third port filter inductor L o ; The specific connection method is: the eleventh switch tube S c1 The drain is connected to the fifth clamp capacitor C c1 , the eleventh switch tube S c1 The source is connected to the twelfth switch tube S c2 The drain of the second high-frequency chain inductor L c and the third port filter inductor L o , the twelfth switch tube S c2 The source of the third port is connected to the filter capacitor C3 and the sixth clamping capacitor C c2 , the same-name end of the third-port transformer winding is connected to the second high-frequency chain inductor L c The other end of the third port transformer winding is connected to the fifth clamping capacitor C c1 and the sixth clamping capacitor C c2 , the third port filter capacitor C3 and the third port filter inductor L o Connect low voltage battery;

[0013] The drain of the third switch tube S3 of the front-stage flying capacitor type three-level structure and the source of the sixth switch tube S6 are connected to the first port filter capacitor C1 of the rear-stage two-inductor isolation type three-half-bridge structure.

[0014] A control method for an on-board integrated electric energy routing topology structure, wherein the front-stage flying capacitor type three-level structure adopts a PWM control method to achieve output stability in both rectification and inversion modes; the rear-stage two-inductor isolation type three-half-bridge structure adopts a phase shift control method to change the phase shift angles among the first port half-bridge structure, the second port half-bridge structure and the third port half-bridge structure, thereby achieving flexible energy transmission among various modules inside an electric vehicle; the PWM control method and the phase shift control method are combined to achieve power dispatching between on-board equipment of an electric vehicle and an external power grid.

[0015] A further improvement of the technical solution of the present invention is that the vehicle-mounted integrated power routing topology structure can satisfy three working modes inside the electric vehicle:

[0016] When the working mode is parking charging mode, the first port half-bridge structure is the source, the second port half-bridge structure and the third port half-bridge structure are loads, the output priority of the third port half-bridge structure is higher than that of the second port half-bridge structure, the power of the second port half-bridge structure is in follow-up mode, the third port half-bridge structure works in voltage source mode, and the second port half-bridge structure works in current source mode, that is, constant current charging;

[0017] When the working mode is the picnic mode, the second port half-bridge structure is a source, the first port half-bridge structure and the third port half-bridge structure are loads, the third port half-bridge structure works in a voltage source mode, and the first port half-bridge structure works in a constant voltage current limiting mode;

[0018] When the working mode is the normal driving mode, the second port half-bridge structure is a source, the third port half-bridge structure is a load, and the third port half-bridge structure works in a voltage source mode.

[0019] A further improvement of the technical solution of the present invention is that: when the working mode is the parking charging mode, the front-stage flying capacitor type three-level structure collects the voltage of the first port filter capacitor C1 of the rear-stage two-inductor isolation type three-half-bridge structure, and after comparing with the set value, a closed-loop adjustment is performed so that the input voltage of the first port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure is close to the set value, and the rear-stage two-inductor isolation type three-half-bridge structure collects the current of the second port filter capacitor C2 and the third port filter inductor L o The voltage is compared with the set value and then closed-loop regulated to make the high-voltage power battery charged with constant current, and the low-voltage battery outputs a stable voltage value to supply the internal load of the electric vehicle. The purpose of power transmission and priority control of the port is achieved by controlling the phase shift angle of the second port half-bridge structure and the third port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure to the first port half-bridge structure.

[0020] A further improvement of the technical solution of the present invention is that: when the working mode is the picnic mode, the front-stage flying capacitor type three-level structure collects the voltage of the first filter capacitor C, compares it with the set value, and then performs closed-loop regulation so that the output voltage of the front-stage structure is close to the set value; the rear-stage two-inductor isolation type three-half-bridge structure collects the voltage of the first port filter capacitor C1 and the voltage of the third port filter capacitor C3, compares them with the set value, and then performs closed-loop regulation so that the first port half-bridge structure outputs a stable voltage value to supply the front-stage flying capacitor type three-level structure, and the low-voltage battery outputs a stable voltage value to supply the internal load of the electric vehicle, and the purpose of power transmission and priority control of the port is achieved by controlling the phase shift angle of the first port half-bridge structure and the third port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure to the second port half-bridge structure.

[0021] A further improvement of the technical solution of the present invention is that: when the working mode is the normal driving mode, the rear-stage two-inductor isolation type three-half-bridge structure collects the voltage of the third-port filter capacitor C3, compares it with the set value, and then performs closed-loop regulation so that the third-port half-bridge structure outputs a stable voltage to supply the internal load of the electric vehicle, and the purpose of controlling the port power transmission is achieved by controlling the phase shift angle of the third-port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure to the second-port half-bridge structure.

[0022] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0023] 1. The design of the two-inductor structure of the rear-stage two-inductor isolation type three-half-bridge structure of the vehicle-mounted integrated power routing topology structure in the present invention realizes the lightweight of the entire device.

[0024] 2. The present invention can realize three working modes of vehicle-mounted integrated power routing by controlling the duty cycle of the front-stage flying capacitor type three-level structure and the phase shift angle of the rear-stage two-inductor isolation type three-half-bridge structure.

[0025] 3. The present invention adopts a phase shift + PWM control method to achieve flexible energy transmission between the first port half-bridge structure, the second port half-bridge structure and the third port half-bridge structure. The six power switching devices of the subsequent circuit can all achieve zero voltage switching, avoiding the problems of large loss, low power density, large weight and the like in some existing solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the topological structure of the vehicle-mounted integrated electric energy routing in an embodiment of the present invention;

[0027] Figure 2 is a control block diagram of a parking charging mode of a vehicle-mounted integrated electric energy routing topology structure in an embodiment of the present invention;

[0028] Figure 3 It is a control block diagram of a picnic mode of a vehicle-mounted integrated electric energy routing topology structure in an embodiment of the present invention;

[0029] Figure 4 It is a control block diagram of a normal driving mode of a vehicle-mounted integrated electric energy routing topology structure according to an embodiment of the present invention;

[0030] Figure 5 The electrical schematic diagram of the vehicle-mounted integrated power routing topology structure in an embodiment of the present invention replaces the front-stage flying capacitor type three-level structure with a bridge-type totem pole structure;

[0031] Figure 6 The electrical schematic diagram of the vehicle-mounted integrated power routing topology structure in an embodiment of the present invention in which the rear-stage two-inductor isolation type three-half-bridge structure is replaced with a three-full-bridge structure;

[0032] Figure 7 The electrical schematic diagram of the vehicle-mounted integrated power routing topology structure in an embodiment of the present invention replaces the port structure of the rear-stage two-inductor isolation type three-half bridge with a diode bridge circuit. DETAILED DESCRIPTION

[0033] The embodiment of the present invention solves the problems of high power density and heavy weight of the existing on-board power routing by providing an on-board integrated power routing topology structure and a control method thereof, and realizes lightweighting of the whole equipment by designing a two-inductor structure of a rear-stage two-inductor isolation type three-half-bridge structure.

[0034] PWM is the abbreviation of Pulse Width Modulation, which refers to pulse width modulation technology. By modulating the width of a series of pulses, the required waveform (including shape and amplitude) is equivalently obtained.

[0035] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0036] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0037] like Figure 1 As shown, a vehicle-mounted integrated power routing topology structure includes a front-stage flying capacitor type three-level structure and a rear-stage two-inductor isolation type three-half-bridge structure;

[0038] The front-stage flying capacitor type three-level structure includes six power switch devices (a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a fifth switch tube S5, and a sixth switch tube S6), a filter inductor (a first filter inductor L), a filter capacitor (a first filter capacitor C), and a flying capacitor C fly ;

[0039] The specific connection mode of the front-stage flying capacitor type three-level structure is as follows: the drain of the first switch tube S1 is connected to the drain of the third switch tube S3, the source of the first switch tube S1 is connected to the drain of the second switch tube S2 and the first filter inductor L, one end of the first filter inductor L is connected to the single-phase AC power grid / load and the first filter capacitor C, and the other end is connected to the source of the first switch tube S1 and the drain of the second switch tube S2, the first filter capacitor C is connected in parallel with the single-phase AC power grid / load, the source of the second switch tube S2 is connected to the source of the sixth switch tube S6, and the source of the third switch tube S3 is connected to the drain of the fourth switch tube S4 and the flying capacitor C. fly The source of the fourth switch tube S4 is connected to the drain of the fifth switch tube S5 and the first filter capacitor C, and the source of the fifth switch tube S5 is connected to the drain of the sixth switch tube S6 and the flying capacitor C fly , flying capacitor C fly The source of the third switch tube S3, the drain of the fourth switch tube S4, the source of the fifth switch tube S5 and the drain of the sixth switch tube S6 are connected.

[0040] The rear-stage two-inductor isolation type three-half-bridge structure includes a first-port half-bridge structure, a three-winding transformer, a second-port half-bridge structure and a third-port half-bridge structure;

[0041] The first port half-bridge structure includes two power switch devices (the seventh switch tube S a1 , the eighth switch tube S a2 ), two clamping capacitors (the first clamping capacitor C a1 , the second clamping capacitor C a2 ) and the first port filter capacitor C1; the specific connection method is:

[0042] The seventh switch tube S a1 The source is connected to the eighth switch tube S a2 The drain of the first port transformer winding has the same name as the first port, and the eighth switch tube S a2 The source of the first port is connected to the filter capacitor C1 and the second clamp capacitor C a2 The same-name end of the first port transformer winding is connected to the seventh switch tube S a1 The source of the eighth switch tube S a2 The drain of the first port transformer winding is connected to the first clamping capacitor C a1 and the second clamping capacitor C a2, the first port filter capacitor C1 is connected to the previous stage flying capacitor type three-level structure.

[0043] The second port half-bridge structure includes two power switch devices (ninth switch tube S b1 , the tenth switch tube S b2 ), two clamping capacitors (the third clamping capacitor C b1 , the fourth clamping capacitor C b2 )、The first high frequency chain inductor L b And the second port filter capacitor C2; the specific connection method is:

[0044] The ninth switch tube S b1 The drain is connected to the third clamp capacitor C b1 and the second port filter capacitor C2, the ninth switch tube S b1 The source is connected to the tenth switch tube S b2 The drain and first high frequency chain inductance L b , the tenth switch tube S b2 The source of the second port is connected to the filter capacitor C2 and the fourth clamping capacitor C b2 The same-name end of the second port transformer winding is connected to the first high-frequency chain inductor L b The other end of the second port transformer winding is connected to the third clamping capacitor C b1 and the fourth clamping capacitor C b2 , the second port filter capacitor C2 is connected to the high-voltage power battery.

[0045] The third port half-bridge structure includes two power switch devices (the eleventh switch tube S c1 , the twelfth switch tube S c2 ), two clamping capacitors (the fifth clamping capacitor C c1 , the sixth clamping capacitor C c2 )、The second high frequency chain inductor L c , the third port filter capacitor C3 and the third port filter inductor L o ; The specific connection method is:

[0046] The eleventh switch tube S c1 The drain is connected to the fifth clamp capacitor C c1 , the eleventh switch tube S c1 The source is connected to the twelfth switch tube S c2 The drain of the second high-frequency chain inductor L c and the third port filter inductor L o , the twelfth switch tube S c2 The source of the third port is connected to the filter capacitor C3 and the sixth clamping capacitor C c2 , the same-name end of the third-port transformer winding is connected to the second high-frequency chain inductor L of the third port c, the other end of the third port transformer winding is connected to the fifth clamping capacitor C c1 and the sixth clamping capacitor C c2 , the third port filter capacitor C3 and the third port filter inductor L o Connect the low voltage battery.

[0047] A control method for an on-board integrated electric energy routing topology structure, wherein the front-stage flying capacitor type three-level structure adopts a PWM control method to achieve output stability in both rectification and inversion modes; the rear-stage two-inductor isolation type three-half-bridge structure adopts a phase shift control method to change the phase shift angles among the first port half-bridge structure, the second port half-bridge structure and the third port half-bridge structure, thereby achieving flexible energy transmission among various modules inside an electric vehicle; the PWM control method and the phase shift control method are combined to achieve power dispatching between on-board equipment of an electric vehicle and an external power grid.

[0048] The on-board integrated power routing topology can meet the three working modes inside the electric vehicle:

[0049] When the working mode is parking charging mode, the first port half-bridge structure is the source, the second port half-bridge structure and the third port half-bridge structure are loads, the output priority of the third port half-bridge structure is higher than that of the second port half-bridge structure, the power of the second port half-bridge structure is in follow-up mode, the third port half-bridge structure works in voltage source mode, and the second port half-bridge structure works in current source mode, that is, constant current charging;

[0050] When the working mode is the picnic mode, the second port half-bridge structure is a source, the first port half-bridge structure and the third port half-bridge structure are loads, the third port half-bridge structure works in a voltage source mode, and the first port half-bridge structure works in a constant voltage current limiting mode;

[0051] When the working mode is the normal driving mode, the second port half-bridge structure is a source, the third port half-bridge structure is a load, and the third port half-bridge structure works in a voltage source mode.

[0052] like Figure 2 As shown, it is a control block diagram of a parking charging mode of a vehicle-mounted integrated power routing topology structure. The front-stage flying capacitor type three-level structure adopts PWM control. In this mode, the third switch tube S3 and the sixth switch tube S6 of the power switch device give a normally closed signal. The front-stage flying capacitor type three-level structure can be equivalent to a bridge totem pole circuit. The flying capacitor C flyAs a filter capacitor, a voltage outer loop and current inner loop control method is adopted, and the voltage value of the first port filter capacitor C1 of the rear-stage two-inductor isolation type three-half-bridge structure is compared with the reference value. The signal processed by the regulator is multiplied by the processed AC voltage reference to obtain the AC current reference, and then the error obtained by comparison with the AC current reference is finally obtained through the regulator to obtain the drive signal of the fourth switch tube S4 and the fifth switch tube S5 high-frequency power switch device. After the AC voltage reference is compared with 0 through the phase-locked loop, the drive signals of the first switch tube S1 and the second switch tube S2 power frequency switch device are obtained respectively, so as to control the voltage of the first port filter capacitor C1 of the rear-stage two-inductor isolation type three-half-bridge structure. The rear-stage two-inductor isolation type three-half-bridge structure adopts phase shift control, and the output current at the second port half-bridge structure and the voltage of the third port filter capacitor C3 are taken. The error obtained after comparing with the given value is output as a PWM signal through the regulator to the ninth switch tube S of the power switch device. b1 , the tenth switch tube S b2 , Eleventh switch tube S c1 , the twelfth switch tube S c2 , controlling the output current of the second port half-bridge structure and the voltage of the third port filter capacitor C3.

[0053] like Figure 3 As shown, it is a control block diagram of a picnic mode of a vehicle-mounted integrated power routing topology structure. The front-stage flying capacitor type three-level structure adopts PWM control. In this mode, the voltage of the first filter capacitor C is taken as the reference, and the reference voltage is compared with the reference voltage to obtain an error signal. After the regulator, the PWM signal is obtained and given to the third switch tube S3, the fourth switch tube S4, the fifth switch tube S5, the sixth switch tube S6, the first switch tube S1, and the second switch tube S2 of the power switch device, so as to control the voltage of the first filter capacitor C. The rear-stage two-inductor isolation type three-half-bridge structure adopts phase shift control, and the voltage of the first port filter capacitor C1 and the voltage of the third port filter capacitor C3 are taken. The error obtained after comparison with the given value is output as a PWM signal through the regulator and given to the seventh switch tube S of the power switch device. a1 , the eighth switch tube S a2 , Eleventh switch tube S c1 , the twelfth switch tube S c2 , control the voltage of the first port filter capacitor C1 and the third port filter capacitor C3.

[0054] like Figure 4 As shown in FIG. 1 , a control block diagram of a normal driving mode of an on-board integrated power routing topology is shown. The rear-stage two-inductor isolation type three-half-bridge structure adopts phase shift control. The voltage of the third port filter capacitor C3 is taken, and the error obtained after comparison with the given value is output as a PWM signal through the regulator to the eleventh switch tube S of the power switch device. c1 , the twelfth switch tube S c2, control the voltage of the third port filter capacitor C3.

[0055] like Figure 5 As shown in the figure, it is a schematic diagram of a novel on-board integrated power routing topology structure, in which the flying capacitor type three-level structure of the previous stage is replaced by a bridge totem pole structure. Although the latter reduces the power switching devices and reduces the cost, at the operating frequency of 100kHz, the filter circuit parameters of the former are smaller, and its lightweight feature makes it more suitable for use in electric vehicles.

[0056] like Figure 6-Figure 7 As shown in FIG. 1 , a schematic diagram of another novel on-board integrated power routing topology is shown, in which part of the port structure of the rear-stage two-inductor isolation type three-half-bridge structure is replaced with a full-bridge and diode bridge circuit structure. Although the full-bridge structure and synchronous rectification have more control freedom, the circuit structure is complex, the whole machine is heavy and the cost is high, and the diode bridge circuit has greater losses.

[0057] In summary, the present invention is aimed at vehicle-mounted integrated power routing, combines a flying capacitor type three-level structure with a two-inductor isolation type three-half-bridge structure, proposes a novel vehicle-mounted integrated power routing topology, and designs a control method for three working modes of internal power transmission of electric vehicles, thereby realizing the flexible flow of energy between the external AC power grid / load, the high-voltage power battery and the low-voltage battery. The topology also has the characteristics of lightweight, and selecting a suitable control method can realize a wide range of soft switching and improve work efficiency.

Claims

1. A vehicle-mounted integrated power routing topology structure, characterized in that: It includes a front-stage flying capacitor type three-level structure and a rear-stage two-inductor isolation type three-half-bridge structure; The front-stage flying capacitor type three-level structure includes a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a fifth switch tube S5, a sixth switch tube S6, a first filter inductor L, a first filter capacitor C and a flying capacitor C fly The specific connection method is: the drain of the first switch tube S1 is connected to the drain of the third switch tube S3, the source of the first switch tube S1 is connected to the drain of the second switch tube S2 and the first filter inductor L, the source of the second switch tube S2 is connected to the source of the sixth switch tube S6, and the source of the third switch tube S3 is connected to the drain of the fourth switch tube S4 and the flying capacitor C fly The source of the fourth switch tube S4 is connected to the drain of the fifth switch tube S5 and the first filter capacitor C, and the source of the fifth switch tube S5 is connected to the drain of the sixth switch tube S6 and the flying capacitor C fly , the first filter capacitor C is connected to the single-phase AC power grid and the load; The rear-stage two-inductor isolation type three-half-bridge structure includes a first-port half-bridge structure, a three-winding transformer, a second-port half-bridge structure and a third-port half-bridge structure; The first port half-bridge structure includes a seventh switch tube S a1 , the eighth switch tube S a2 , the first clamping capacitor C a1 , the second clamping capacitor C a2 and the first port filter capacitor C1; the specific connection method is: the seventh switch tube S a1 The drain is connected to the first clamping capacitor C a1 and the first port filter capacitor C1, the seventh switch tube S a1 The source is connected to the eighth switch tube S a2 The drain of the first port transformer winding has the same name as the first port, and the eighth switch tube S a2 The source of the first port is connected to the filter capacitor C1 and the second clamp capacitor C a2 The other end of the first port transformer winding is connected to the first clamping capacitor C a1 and the second clamping capacitor C a2 ; The second port half-bridge structure includes a ninth switch tube S b1 , the tenth switch tube S b2 , the third clamping capacitor C b1 , the fourth clamping capacitor C b2 , the first high frequency chain inductor L b and the second port filter capacitor C2; the specific connection method is: the ninth switch tube S b1 The drain is connected to the third clamping capacitor C b1 and the second port filter capacitor C2, the ninth switch tube S b1 The source is connected to the tenth switch tube S b2 The drain and first high frequency chain inductance L b , the tenth switch tube S b2 The source of the second port is connected to the filter capacitor C2 and the fourth clamping capacitor C b2 The same-name end of the second port transformer winding is connected to the first high-frequency chain inductor L b The other end of the second port transformer winding is connected to the third clamping capacitor C b1 and the fourth clamping capacitor C b2 , the second port filter capacitor C2 is connected to the high-voltage power battery; The third port half-bridge structure includes an eleventh switch tube S c1 , the twelfth switch tube S c2 、The fifth clamping capacitor C c1 , the sixth clamping capacitor C c2 , the second high frequency chain inductor L c , the third port filter capacitor C3 and the third port filter inductor L o ; The specific connection method is: the eleventh switch tube S c1 The drain is connected to the fifth clamp capacitor C c1 , the eleventh switch tube S c1 The source is connected to the twelfth switch tube S c2 The drain of the second high-frequency chain inductor L c and the third port filter inductor L o , the twelfth switch tube S c2 The source of the third port is connected to the filter capacitor C3 and the sixth clamping capacitor C c2 , the same-name end of the third-port transformer winding is connected to the second high-frequency chain inductor L c The other end of the third port transformer winding is connected to the fifth clamping capacitor C c1 and the sixth clamping capacitor C c2 , the third port filter capacitor C3 and the third port filter inductor L o Connect low voltage battery; The drain of the third switch tube S3 of the front-stage flying capacitor type three-level structure and the source of the sixth switch tube S6 are connected to the first port filter capacitor C1 of the rear-stage two-inductor isolation type three-half-bridge structure.

2. A control method for the vehicle-mounted integrated power routing topology structure as claimed in claim 1, characterized in that: The front-stage flying capacitor type three-level structure adopts PWM control to achieve stable output in both rectification and inversion modes; the rear-stage two-inductor isolation type three-half-bridge structure adopts phase shift control to change the phase shift angles among the three ports of the first-port half-bridge structure, the second-port half-bridge structure and the third-port half-bridge structure, thereby achieving flexible energy transmission among various modules inside the electric vehicle; the combination of PWM control and phase shift control realizes power scheduling between on-board equipment of the electric vehicle and the external power grid.

3. The control method of the vehicle-mounted integrated power routing topology structure according to claim 2, characterized in that: The on-board integrated power routing topology can meet the three working modes inside the electric vehicle: When the working mode is parking charging mode, the first port half-bridge structure is the source, the second port half-bridge structure and the third port half-bridge structure are loads, the output priority of the third port half-bridge structure is higher than that of the second port half-bridge structure, the power of the second port half-bridge structure is in follow-up mode, the third port half-bridge structure works in voltage source mode, and the second port half-bridge structure works in current source mode, that is, constant current charging; When the working mode is the picnic mode, the second port half-bridge structure is a source, the first port half-bridge structure and the third port half-bridge structure are loads, the third port half-bridge structure works in a voltage source mode, and the first port half-bridge structure works in a constant voltage current limiting mode; When the working mode is the normal driving mode, the second port half-bridge structure is a source, the third port half-bridge structure is a load, and the third port half-bridge structure works in a voltage source mode.

4. The control method of the vehicle-mounted integrated power routing topology structure according to claim 3, characterized in that: When the working mode is the parking charging mode, the front-stage flying capacitor type three-level structure collects the voltage of the first port filter capacitor C1 of the rear-stage two-inductor isolation type three-half-bridge structure, and after comparing it with the set value, it is adjusted through a closed loop so that the input voltage of the first port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure is close to the set value, and the rear-stage two-inductor isolation type three-half-bridge structure collects the current of the second port filter capacitor C2 and the third port filter inductor L o The voltage is compared with the set value and then closed-loop regulated to make the high-voltage power battery charged with constant current, and the low-voltage battery outputs a stable voltage value to supply the internal load of the electric vehicle. The purpose of power transmission and priority control of the port is achieved by controlling the phase shift angle of the second port half-bridge structure and the third port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure to the first port half-bridge structure.

5. The control method of the vehicle-mounted integrated power routing topology structure according to claim 3, characterized in that: When the working mode is the picnic mode, the front-stage flying capacitor type three-level structure collects the voltage of the first filter capacitor C, compares it with the set value, and then performs closed-loop regulation so that the output voltage of the front-stage structure is close to the set value. The rear-stage two-inductor isolation type three-half-bridge structure collects the voltage of the first port filter capacitor C1 and the voltage of the third port filter capacitor C3, compares them with the set value, and then performs closed-loop regulation so that the first port half-bridge structure outputs a stable voltage value to supply the front-stage flying capacitor type three-level structure, and the low-voltage battery outputs a stable voltage value to supply the internal load of the electric vehicle. The purpose of power transmission and priority control of the port is achieved by controlling the phase shift angle of the first port half-bridge structure and the third port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure to the second port half-bridge structure.

6. The control method of the vehicle-mounted integrated power routing topology structure according to claim 3, characterized in that: When the working mode is the normal driving mode, the rear-stage two-inductor isolation type three-half-bridge structure collects the voltage of the third-port filter capacitor C3, compares it with the set value, and then performs closed-loop regulation to make the third-port half-bridge structure output a stable voltage to supply the internal load of the electric vehicle. The purpose of controlling the port power transmission is achieved by controlling the phase shift angle of the third-port half-bridge structure of the rear-stage two-inductor isolation type three-half-bridge structure to the second-port half-bridge structure.

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