CN211239430U

CN211239430U - High-power vehicle-mounted charging integrated system

Info

Publication number: CN211239430U
Application number: CN201922489321.3U
Authority: CN
Inventors: 杨金亮; 贾雪云; 绳有为; 崔东宇; 李明强; 王平来
Original assignee: Sinotruk Jinan Power Co Ltd
Current assignee: Sinotruk Jinan Power Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-11
Anticipated expiration: 2029-12-31

Abstract

The utility model provides a high-power on-vehicle integrated system that charges, including three-phase alternating current input pre-charge circuit, input filter circuit, PWM controllable rectifier circuit, voltage stabilizing circuit, DCDC integrated circuit, output filter circuit, output pre-charge circuit. When AC charging, the power accumulator is first switched on, and the output filter circuit is pre-charged through the output pre-charging circuit. Then the input three-phase current is switched on, and the input filter circuit is pre-charged through the input pre-charging circuit. After the circuits at the two ends are switched on, the three-phase input circuit is started, three-phase alternating current is converted into direct current through the PWM controllable rectifying circuit, the voltage passing through the whole circuit is smoothed through the voltage stabilizing circuit and is transmitted to the double DCDC module for boosting and isolating, the boosted power supply is filtered through the output filter circuit and is finally transmitted to the power battery through the positive diode and the negative electrode, and therefore the charging process of the power battery is completed.

Description

High-power vehicle-mounted charging integrated system

Technical Field

The utility model relates to a new energy automobile technical field especially relates to a high-power on-vehicle integrated system that charges.

Background

The new energy automobile adopts a high-voltage battery for power supply, and has various charging modes of a power battery, such as a conduction mode, a non-conduction mode, an alternating current mode, a direct current mode and the like. For commercial vehicles, the electric quantity of a power battery carried on the whole vehicle is generally hundreds of degrees, so that higher requirements on the charging speed are provided, and a direct current charging mode is generally adopted. However, some commercial vehicles require an ac charging mode. Therefore, the whole vehicle is necessary to carry the alternating current vehicle-mounted charger, and the power of the vehicle-mounted charger of a common commercial vehicle is dozens of kilowatts in consideration of charging time and power, so that the integrated design of the high-power vehicle-mounted charger is tested to a certain extent.

Most low-power vehicle-mounted chargers are relatively mature in integration and only consist of an input module, a filtering module, an uncontrollable rectifying module, a DCDC conversion module with isolation and an output filtering module. However, high power on-board charging requires multiple DCDC module integration and more complex peripheral integrated circuits. Due to the complex circuit, the reliability is poor and the use efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough among the above-mentioned prior art, the utility model provides a high-power on-vehicle integrated system that charges, include: the three-phase alternating current input pre-charging circuit comprises a three-phase alternating current input pre-charging circuit, an input filter circuit, a PWM (pulse width modulation) rectifying circuit, a voltage stabilizing circuit, a DCDC integrated circuit, an output filter circuit and an output pre-charging circuit;

the input end of the three-phase alternating current input pre-charging circuit is connected with three-phase alternating current;

the output end of the three-phase alternating current input pre-charging circuit is sequentially connected with an input filter circuit, a PWM (pulse width modulation) rectifying circuit, a voltage stabilizing circuit, a DCDC integrated circuit, an output filter circuit and an output pre-charging circuit;

the output end of the output pre-charging circuit is a direct current output side of the system, and a formed loop is a power battery anode and a power battery cathode.

According to the technical scheme, the utility model has the advantages of it is following:

the utility model discloses a system operation is more stable and safe, and when exchanging charge, at first put through power battery, carries out the pre-charge to output filter circuit through output pre-charge circuit. Then the input three-phase current is switched on, and the input filter circuit is pre-charged through the input pre-charging circuit. After the circuits at the two ends are switched on, the three-phase input circuit is started, three-phase alternating current is converted into direct current through the PWM controllable rectifying circuit, the voltage passing through the whole circuit is smoothed through the voltage stabilizing circuit and is transmitted to the double DCDC module for boosting and isolating, the boosted power supply is filtered through the output filter circuit and is finally transmitted to the power battery through the positive diode and the negative electrode, and therefore the charging process of the power battery is completed.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a high-power vehicle-mounted charging integrated system;

fig. 2 is a schematic diagram of an embodiment of a high-power vehicle-mounted charging integrated system.

Detailed Description

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The utility model provides a high-power on-vehicle integrated system that charges, as shown in figure 1 and figure 2, include: the three-phase alternating current input pre-charging circuit comprises a three-phase alternating current input pre-charging circuit 1, an input filter circuit 2, a PWM (pulse width modulation) rectifying circuit 3, a voltage stabilizing circuit 4, a DCDC integrated circuit 5, an output filter circuit 6 and an output pre-charging circuit 7;

the input end of the three-phase alternating current input pre-charging circuit 1 is connected with three-phase alternating current; the output end of the three-phase alternating current input pre-charging circuit 1 is sequentially connected with an input filter circuit 2, a PWM (pulse-width modulation) rectification circuit 3, a voltage stabilizing circuit 4, a DCDC integrated circuit 5, an output filter circuit 6 and an output pre-charging circuit 7; the output end of the output pre-charging circuit 7 is the direct current output side of the system, and the formed loop is the anode of the power battery and the cathode of the power battery.

The utility model provides a three-phase AC input pre-charge circuit 1 includes: the system comprises an a-phase main relay K1, an a-phase pre-charging relay K2, a b-phase main relay K3, a b-phase pre-charging relay K4, an a-phase pre-charging resistor R1 and a b-phase pre-charging resistor R2;

the input filter circuit 2 includes: a phase inductance La, a phase inductance Lb and a phase inductance Lc; the first end of the a-phase main relay K1 and the first end of the a-phase pre-charging relay K2 are respectively connected with an a-phase power supply; the second end of the a-phase pre-charging relay K2 is connected with the first end of the a-phase pre-charging resistor R1; the second end of the a-phase pre-charging resistor R1 and the second end of the a-phase main relay K1 are respectively connected with the first end of the a-phase inductor La; the first end of the b-phase main relay K3 and the first end of the b-phase pre-charging relay K4 are respectively connected with a b-phase power supply; the second end of the b-phase pre-charging relay K4 is connected with the first end of a b-phase pre-charging resistor R2; the second end of the b-phase pre-charging resistor R2 and the second end of the first end of the b-phase main relay K3 are respectively connected with the first end of the a-phase inductor La; the c-phase power supply is connected with the first end of the c-phase inductor Lc; and the second end of the phase a inductor La, the second end of the phase b inductor Lb and the second end of the phase c inductor Lc are respectively connected with the input end of the PWM rectification circuit 3.

The PWM rectification circuit 3 includes: a field effect transistor T1, a field effect transistor T2, a field effect transistor T3, a field effect transistor T4, a field effect transistor T5, and a field effect transistor T6; the second end of the phase-a inductor La is respectively connected with the second end of the field effect transistor T1 and the first end of the field effect transistor T4; the second end of the b-phase inductor Lb is connected with the second end of the field effect transistor T3 and the first end of the field effect transistor T6 respectively; the second end of the c-phase inductor Lc is connected with the second end of the field effect transistor T5 and the first end of the field effect transistor T2 respectively; the first end of the field effect transistor T1, the first end of the field effect transistor T3 and the first end of the field effect transistor T5 are respectively connected with the positive electrode output end of the PWM rectification circuit 3; the second end of the field effect transistor T4, the second end of the field effect transistor T6 and the second end of the field effect transistor T2 are respectively connected with the negative electrode output end of the PWM rectification circuit 3.

The voltage stabilizing circuit 4 includes: a support capacitor C1, a capacitor C2, a capacitor C3, a voltage dividing resistor R3 and a voltage dividing resistor R4; the first end of the supporting capacitor C1 is connected with the first positive electrode line of the voltage stabilizing circuit 4; the second end of the supporting capacitor C1 is connected with the second negative electrode circuit of the voltage stabilizing circuit 4; the first end of the capacitor C2 and the first end of the divider resistor R3 are respectively connected with a first positive electrode line of the voltage stabilizing circuit 4; the second end of the capacitor C2 and the second end of the divider resistor R3 are respectively connected with a first negative electrode circuit of the voltage stabilizing circuit 4; the first end of the capacitor C3 and the first end of the divider resistor R4 are respectively connected with a second positive electrode line of the voltage stabilizing circuit 4; the second end of the capacitor C3 and the second end of the divider resistor R4 are respectively connected with a second negative electrode circuit of the voltage stabilizing circuit 4; a first positive electrode circuit of the voltage stabilizing circuit 4 is connected with the positive electrode output end of the PWM rectifying circuit 3; and a second negative electrode circuit of the voltage stabilizing circuit 4 is connected with the negative electrode output end of the PWM rectifying circuit 3.

The DCDC integrated circuit 5 includes: a first DCDC circuit 11 and a second DCDC circuit 12; a first input terminal of the first DCDC circuit 11 is connected to the first positive line; a second input terminal and a first negative electrode line of the first DCDC circuit 11; a first input terminal and a second positive line of the second DCDC circuit 12; a second input terminal of the second DCDC circuit 12 and a second negative line; a first output end of the first DCDC circuit 11 and a first output end of the second DCDC circuit 12 are respectively connected with a first input end of the output filter circuit 6; a second output terminal of the first DCDC circuit 11 and a second output terminal of the second DCDC circuit 12 are respectively connected to a second input terminal of the output filter circuit 6.

The output filter circuit 6 includes: an output filter inductor CT1, and an output filter capacitor C4; a first input end of the output filter inductor CT1 is connected to a first input end of the output filter circuit 6; a second input end of the output filter inductor CT1 is connected to a second input end of the output filter circuit 6; a first output end of the output filter inductor CT1 and a first end of the output filter capacitor C4 are respectively connected with a first output end of the output filter circuit 6; a second output end of the output filter inductor CT1 and a second end of the output filter capacitor C4 are respectively connected to a second output end of the output filter circuit 6; and the second output end of the output filter circuit 6 is connected with the cathode of the power battery.

A first output end of the output filter circuit 6 is connected with an output pre-charging circuit 7; the output precharge circuit 7 includes: an output pre-charge resistor R5 and an output diode D7; the first end of the output pre-charging resistor R5 and the anode of the output diode D7 are respectively connected with the first output end of the output filter circuit 6; the second end of the output pre-charging resistor R5 and the cathode of the output diode D7 are respectively connected with the anode of the power battery.

Based on above-mentioned high-power on-vehicle integrated system that charges the utility model discloses a method includes: a DC output pre-charging process and an AC input pre-charging process;

the direct current output pre-charging process is that the positive pole Ubat + of the power battery of the system and the negative pole Ubat-of the power battery are respectively and correspondingly connected with the positive pole and the negative pole of the power battery;

when the power battery needs to be charged, the electric energy of the power battery is connected to a loop formed by the direct current output sides Ubat + and Ubat-of the system through the anode and the cathode of the power battery;

a three-phase power supply sequentially passes through a three-phase alternating current input pre-charging circuit 1, an input filter circuit 2, a PWM (pulse-width modulation) rectification circuit 3, a voltage stabilizing circuit 4, a DCDC integrated circuit 5, an output filter circuit 6 and an output pre-charging circuit 7 to pre-charge an output filter capacitor C4;

the AC input precharging process is that three phases a, b and c on the AC input side of the system are connected to ports L1, L2 and L3 of the AC charging pile through an AC charging seat;

when the power battery needs to be charged, the alternating current charging pile is connected to the three phases a, b and c on the alternating current input side of the system through ports L1, L2 and L3 to form a pre-charging circuit;

the a phase of the alternating current input side of the system is connected with a support capacitor C1, a capacitor C2, a capacitor C3 and a field effect tube T2 through an a phase pre-charging relay K2, an a phase pre-charging resistor R1, an a phase inductor La, a field effect tube T1;

the c-phase inductor Lc is connected with an alternating current charging pile through a c phase on the alternating current input side of the system and forms a pre-charging loop through an L3 port;

an L2 port of the alternating current charging pile is connected with a phase b of an alternating current input side of the system and sequentially passes through a phase b pre-charging relay K4, a phase b pre-charging resistor R2, a phase b inductor Lb, a field effect tube T3, a supporting capacitor C1, a capacitor C2, a capacitor C3, a field effect tube T2 and a phase C inductor Lc to form a pre-charging loop;

the C-phase alternating current charging pile on the alternating current input side of the system sequentially passes through the port L3, the port L3 of the alternating current charging pile and the C-phase, the field effect transistor T5, the supporting capacitor C1, the capacitor C2, the capacitor C3, the field effect transistor T4, the a-phase inductor La, the a-phase precharging resistor R1 and the a-phase precharging relay K2 on the alternating current input side of the system to form a precharging circuit;

the a phase connection AC charging pile on the AC input side is precharged through a support capacitor C1, a capacitor C2 and a capacitor C3 through an L1 port; after the precharge is completed, the a-phase main relay K1 and the b-phase main relay K3 are closed to perform charging.

And (3) PWM rectification process: when alternating current charging is started, the PWM controllable rectifying circuit is controlled according to a voltage type, and in a phase of 0-30 degrees, the voltage of three phases a, b and c input to an alternating current input side of the high-power vehicle-mounted charging by an alternating current charger is Ua larger than 0, Ub larger than 0 and Uc smaller than 0;

when the FET T4 and the FET T5 are conducted, the first loop circuit is an a-phase inductor La, an FET T4, an FET T2 and a c-phase inductor Lc; the second loop is a boosting chopper circuit formed by the phase-a inductor La, the field effect tube T1, the field effect tube T5 and the phase-c inductor Lc and used for storing energy to the phase-a inductor La and the phase-c inductor Lc; when the FET T4 and the FET T5 are turned off, the supporting capacitor C1, the capacitor C2 and the capacitor C3 are charged through the phase-a inductor La, the FET T1, the FET T2 and the phase-C inductor Lc respectively; when the FET T6 and the FET T5 are conducted, the first loop circuit is a b-phase inductor Lb, an FET T6, an FET T2 and a c-phase inductor Lc; the second loop is formed by a b-phase inductor Lb, a field effect tube T3, a field effect tube T5 and a c-phase inductor Lc, and two boost chopper circuits are used for storing energy to the b-phase inductor Lb and the c-phase inductor Lc; when the FET T6 and the FET T5 are turned off, the supporting capacitor C1, the capacitor C2 and the capacitor C3 are charged through the b-phase inductor Lb, the FET T3, the FET T2 and the C-phase inductor Lc respectively; and a boost chopper circuit and a charging circuit are formed within the range of 30-360 degrees.

The utility model discloses still relate to the PFC process, Power Factor Correction means Power Factor Correction that also is, and Power Factor refers to the relation between active Power and the apparent Power of total Power consumption, also is exactly the ratio of active Power divided by the apparent Power of total Power consumption. Basically, the power factor can measure the effective utilization degree of the power, and when the power factor value is larger, the power utilization rate is higher.

The method further comprises the following steps: and (3) PFC process: the PWM rectification circuit and the voltage stabilizing circuit form a secondary current-by-current circuit; the conversion process of the DCDC integrated circuit is as follows: when alternating current charging is started, if a single charging gun is used for charging, only the first DCDC circuit or the second DCDC circuit is started; if the double charging guns are charged, the first DCDC circuit and the second DCDC circuit are started simultaneously; when the first DCDC circuit is started, the voltage dividing resistor R3 and the voltage dividing resistor R4 form a power supply voltage dividing circuit, and input loops of the first DCDC circuit are U1+ and U1-; when the second DCDC circuit is started, the input loops of the second DCDC circuit are U2+ and U2-. The PWM rectification circuit 3 and the voltage stabilizing circuit 4 form a 2-level current-stepping circuit, so that the power factor is improved.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-power vehicle-mounted charging integrated system is characterized by comprising: the three-phase alternating current input pre-charging circuit comprises a three-phase alternating current input pre-charging circuit (1), an input filter circuit (2), a PWM (pulse width modulation) rectifying circuit (3), a voltage stabilizing circuit (4), a DCDC integrated circuit (5), an output filter circuit (6) and an output pre-charging circuit (7);

the input end of the three-phase alternating current input pre-charging circuit (1) is connected with three-phase alternating current;

the output end of the three-phase alternating current input pre-charging circuit (1) is sequentially connected with an input filter circuit (2), a PWM (pulse-width modulation) rectifying circuit (3), a voltage stabilizing circuit (4), a DCDC integrated circuit (5), an output filter circuit (6) and an output pre-charging circuit (7);

the output end of the output pre-charging circuit (7) is the direct current output side of the system, and the formed loops are the anode of the power battery and the cathode of the power battery.

2. The high-power vehicle-mounted charging integrated system according to claim 1,

a three-phase AC input precharge circuit (1) comprises: the system comprises an a-phase main relay K1, an a-phase pre-charging relay K2, a b-phase main relay K3, a b-phase pre-charging relay K4, an a-phase pre-charging resistor R1 and a b-phase pre-charging resistor R2;

the input filter circuit (2) includes: a phase inductance La, a phase inductance Lb and a phase inductance Lc;

the first end of the a-phase main relay K1 and the first end of the a-phase pre-charging relay K2 are respectively connected with an a-phase power supply;

the second end of the a-phase pre-charging relay K2 is connected with the first end of the a-phase pre-charging resistor R1;

the second end of the a-phase pre-charging resistor R1 and the second end of the a-phase main relay K1 are respectively connected with the first end of the a-phase inductor La;

the first end of the b-phase main relay K3 and the first end of the b-phase pre-charging relay K4 are respectively connected with a b-phase power supply;

the second end of the b-phase pre-charging relay K4 is connected with the first end of a b-phase pre-charging resistor R2;

the second end of the b-phase pre-charging resistor R2 and the second end of the first end of the b-phase main relay K3 are respectively connected with the first end of the a-phase inductor La;

the c-phase power supply is connected with the first end of the c-phase inductor Lc;

and the second end of the phase a inductor La, the second end of the phase b inductor Lb and the second end of the phase c inductor Lc are respectively connected with the input end of the PWM rectifying circuit (3).

3. The high-power vehicle-mounted charging integrated system according to claim 2,

the PWM rectification circuit (3) includes: a field effect transistor T1, a field effect transistor T2, a field effect transistor T3, a field effect transistor T4, a field effect transistor T5, and a field effect transistor T6;

the second end of the phase-a inductor La is respectively connected with the second end of the field effect transistor T1 and the first end of the field effect transistor T4;

the second end of the b-phase inductor Lb is connected with the second end of the field effect transistor T3 and the first end of the field effect transistor T6 respectively;

the second end of the c-phase inductor Lc is connected with the second end of the field effect transistor T5 and the first end of the field effect transistor T2 respectively;

the first end of the field effect transistor T1, the first end of the field effect transistor T3 and the first end of the field effect transistor T5 are respectively connected with the anode output end of the PWM rectifying circuit (3);

the second end of the field effect transistor T4, the second end of the field effect transistor T6 and the second end of the field effect transistor T2 are respectively connected with the negative electrode output end of the PWM rectifying circuit (3).

4. The high-power vehicle-mounted charging integrated system according to claim 1,

the voltage stabilizing circuit (4) includes: a support capacitor C1, a capacitor C2, a capacitor C3, a voltage dividing resistor R3 and a voltage dividing resistor R4;

the first end of the supporting capacitor C1 is connected with a first positive electrode line of the voltage stabilizing circuit (4);

the second end of the supporting capacitor C1 is connected with a second negative electrode circuit of the voltage stabilizing circuit (4);

the first end of the capacitor C2 and the first end of the divider resistor R3 are respectively connected with a first positive electrode line of the voltage stabilizing circuit (4);

the second end of the capacitor C2 and the second end of the divider resistor R3 are respectively connected with a first negative electrode circuit of the voltage stabilizing circuit (4);

the first end of the capacitor C3 and the first end of the divider resistor R4 are respectively connected with a second positive electrode line of the voltage stabilizing circuit (4);

the second end of the capacitor C3 and the second end of the divider resistor R4 are respectively connected with a second negative electrode circuit of the voltage stabilizing circuit (4);

a first positive electrode circuit of the voltage stabilizing circuit (4) is connected with the positive electrode output end of the PWM rectifying circuit (3);

and a second negative electrode circuit of the voltage stabilizing circuit (4) is connected with the negative electrode output end of the PWM rectifying circuit (3).

5. The high-power vehicle-mounted charging integrated system according to claim 4,

the DCDC integrated circuit (5) comprises: a first DCDC circuit (11) and a second DCDC circuit (12);

a first input end of the first DCDC circuit (11) is connected with a first positive electrode line;

a second input end of the first DCDC circuit (11) and a first negative electrode line;

a first input terminal and a second positive line of a second DCDC circuit (12);

a second input end of the second DCDC circuit (12) and a second negative electrode line;

a first output end of the first DCDC circuit (11) and a first output end of the second DCDC circuit (12) are respectively connected with a first input end of the output filter circuit (6);

and a second output end of the first DCDC circuit (11) and a second output end of the second DCDC circuit (12) are respectively connected with a second input end of the output filter circuit (6).

6. The high-power vehicle-mounted charging integrated system according to claim 5,

the output filter circuit (6) includes: an output filter inductor CT1, and an output filter capacitor C4;

a first input end of the output filter inductor CT1 is connected with a first input end of the output filter circuit (6);

a second input end of the output filter inductor CT1 is connected with a second input end of the output filter circuit (6);

a first output end of the output filter inductor CT1 and a first end of the output filter capacitor C4 are respectively connected with a first output end of the output filter circuit (6);

a second output end of the output filter inductor CT1 and a second end of the output filter capacitor C4 are respectively connected with a second output end of the output filter circuit (6);

and the second output end of the output filter circuit (6) is connected with the cathode of the power battery.

7. The high-power vehicle-mounted charging integrated system according to claim 6,

the first output end of the output filter circuit (6) is connected with the output pre-charging circuit (7);

the output precharge circuit (7) includes: an output pre-charge resistor R5 and an output diode D7;

the first end of the output pre-charging resistor R5 and the anode of the output diode D7 are respectively connected with the first output end of the output filter circuit (6);

the second end of the output pre-charging resistor R5 and the cathode of the output diode D7 are respectively connected with the anode of the power battery.