CN221162273U - Charging control system and vehicle - Google Patents

Abstract

The utility model relates to the technical field of charging and discharging, in particular to a charging control system and a vehicle. The system comprises: a first low-voltage discharge circuit, a second low-voltage discharge circuit, and a first motor drive circuit; the first low-voltage discharging circuit and the first motor driving circuit are respectively connected with a battery port of the system; the first low-voltage discharging circuit and the second low-voltage discharging circuit are respectively connected with a low-voltage load port of the system; at least part of the switching devices of the second low-voltage discharging circuit are multiplexed with at least part of the switching devices of the first motor driving circuit and are connected with a battery port of the system through the multiplexed at least part of the switching devices. According to the system provided by the utility model, the potential safety hazard problem of the system caused by the fault of the low-voltage discharge circuit can be solved.

Description

Charging control system and vehicle

Technical Field

The utility model relates to the technical field of charging and discharging, in particular to a charging control system and a vehicle.

Background

The automobile industry is an important pillar industry of national economy, in recent years, with the rapid development of the automobile industry, the contradiction between fuel supply and demand is increasingly prominent, and the development of electric automobiles is accelerated while clean energy such as wind power, solar energy and the like is greatly developed, so that the consumption of load-side gasoline can be effectively reduced, the environment is favorably improved, and the automobile is a necessary choice for sustainable development.

Currently, in an electric vehicle, a low-voltage discharging circuit in a general charge control system is mainly used for inputting electric energy of a power battery to a low-voltage load port to supply power to low-voltage load equipment, such as a storage battery. If the low-voltage discharge circuit of the vehicle fails, the equipment such as a storage battery and the like can be caused to lose power, and then the whole electric appliances of the whole vehicle are powered off, so that the whole vehicle is anchored, and finally serious safety accidents are caused.

Disclosure of utility model

An object of the utility model is to solve the problem of potential safety hazard of the system caused by the fault of the low-voltage discharge circuit.

According to a first aspect of the present utility model, there is provided a charge control system characterized by comprising: a first low-voltage discharge circuit, a second low-voltage discharge circuit, and a first motor drive circuit; the first low-voltage discharging circuit and the first motor driving circuit are respectively connected with a battery port of the system; the first low-voltage discharging circuit and the second low-voltage discharging circuit are respectively connected with a low-voltage load port of the system; at least part of the switching devices of the second low-voltage discharging circuit are multiplexed with at least part of the switching devices of the first motor driving circuit and are connected with a battery port of the system through the multiplexed at least part of the switching devices.

According to a second aspect of the present utility model, there is provided a vehicle comprising a power battery, a motor, a generator and a charge control system as described in any one of the first aspects; the power battery is connected with a battery port of the charging control system.

The utility model has the technical effects that a novel charging control system is provided, and comprises two low-voltage discharging circuits, so that redundancy is formed compared with a single low-voltage discharging circuit, and the problem that the vehicle is anchored due to the failure of the single low-voltage discharging circuit is avoided; and one of the low-voltage discharge circuits further multiplexes the switching device of the motor drive circuit, integrating the motor drive circuit and the low-voltage discharge circuit into one product. The device is saved, the system integration is improved, meanwhile, two low-voltage discharge circuits are arranged, and under the condition that one of the two low-voltage discharge circuits fails, the other low-voltage discharge circuit is used for supplying power to the low-voltage load, so that the safety of the system is improved.

The charge control system of the utility model may be applied to a vehicle.

Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

FIG. 1 is a block diagram of a charge control system according to one embodiment;

FIG. 2 is a circuit diagram of a charge control system according to one embodiment;

FIG. 3 is a circuit diagram of a charge control system according to one embodiment;

FIG. 4 is a circuit diagram of a charge control system according to one embodiment;

FIG. 5 is a circuit diagram of a charge control system according to one embodiment;

FIG. 6 is a circuit diagram of a charge control system according to one embodiment;

FIG. 7 is a circuit diagram of a charge control system according to one embodiment;

FIG. 8 is a circuit diagram of a charge control system according to one embodiment;

The reference numerals:

a charge control system 1000;

An ac charging circuit 100; a power factor correction circuit 130; a high voltage primary side conversion circuit 140; an isolation switching circuit 120; a high voltage secondary side conversion circuit 110;

a power control circuit 300; a voltage adjustment circuit 310; a first motor driving circuit 320; a second motor driving circuit 330; a first leg 1; a second leg 2; a third arm 3; a fourth arm 4;

The low-voltage power supply circuit comprises a first low-voltage discharging circuit 200, a first low-voltage secondary side converting circuit 230, a second low-voltage discharging circuit 400, a filter circuit 500, a first switch S1 and a second switch S2.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses.

Techniques and equipment known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1, a charge control system 1000 of an embodiment of the present disclosure is illustrated.

The utility model discloses a charging control system 1000, comprising: a first low voltage discharge circuit 200, a second low voltage discharge circuit 400, and a first motor drive circuit 320; the first low-voltage discharging circuit 200 and the first motor driving circuit 320 are respectively connected with a battery port of the system; the first low-voltage discharging circuit 200 and the second low-voltage discharging circuit 400 are respectively connected with a low-voltage load port of the system; at least part of the switching devices of the second low voltage discharge circuit 400 multiplex at least part of the switching devices of the first motor driving circuit 320 and are connected to the battery port of the system through the multiplexed at least part of the switching devices.

The battery port of the system 1000 is configured to be coupled to a battery, and the battery port is configured to be coupled to a power battery of a vehicle when the system 1000 is used in the vehicle.

In one embodiment, the motor drive circuit 330 may be a motor drive circuit for driving a motor or a generator control circuit for driving a generator. Correspondingly, the connected electric machine may be an electric motor or a generator, for example a three-phase alternating current motor or a three-phase alternating current generator.

In one example, the motor drive circuit may be connected to a motor port or a generator port. The motor port is connected with a motor of the vehicle to drive the motor to realize running of the vehicle. The generator port is connected with a generator driven by a fuel engine of the vehicle so as to receive alternating current output by the generator.

In one example, the system may further include an ac charging port, and when the system 1000 is used in a vehicle, the external device connected to the ac charging port may be a power source or powered device external to the system 1000, such as a charging post, an on-board ac powered device, or other vehicle.

In one example, the low voltage discharge circuit may include a low voltage primary side conversion circuit, a low voltage isolation conversion circuit, and a low voltage secondary side conversion circuit, which are connected in sequence. The low-voltage secondary side conversion circuit is connected with the low-voltage load port. The low-voltage discharging circuit is used for adjusting the voltage of the direct current and outputting the direct current to the low-voltage load port. The low voltage load port may be connected to a low voltage battery, or other load device, to power the low voltage of the entire vehicle when the low voltage discharge circuit is in the vehicle. Meanwhile, the low-voltage isolation conversion circuit is used for electrically isolating the low-voltage end from the high-voltage end, so that load equipment or devices of the low-voltage end cannot be affected when the high-voltage end fails.

In one example, the first low voltage discharge circuit 200 in the system may operate in a normal condition to power a low voltage load. The second low voltage discharge circuit 400 may be in a standby state when the first low voltage discharge circuit 200 is operated, and may operate instead of the first low voltage discharge circuit after the first low voltage discharge circuit fails.

In one example, the second low voltage discharge circuit 400 includes a low voltage primary side conversion circuit; at least part of the switching devices of the second low voltage discharge circuit 400 multiplex at least part of the switching devices of the first motor drive circuit 320, including: the low voltage primary side conversion circuit multiplexes the switching tubes of the first leg and the second leg of the first motor drive circuit 320.

In one example, the second low voltage discharge circuit 400 further includes a low voltage isolation switching circuit and a second low voltage secondary side switching circuit; the bridge arm midpoint of the first bridge arm and the bridge arm midpoint of the second bridge arm are respectively connected with the primary side winding of the low-voltage isolation conversion circuit, one end of the second low-voltage secondary side conversion circuit is connected with the secondary side winding of the low-voltage isolation conversion circuit, and the other end of the second low-voltage secondary side conversion circuit is connected with the low-voltage load port. In an example, as shown in fig. 2, the first motor driving circuit 320 may include three legs connected in parallel to a bus, and two switching tubes are disposed on each leg, in this example, the three legs of the first motor driving circuit 320 are connected to a battery port through the bus, and the second low voltage discharging circuit 400 may multiplex any two legs of the first motor driving circuit, and based on that two legs are connected to the battery port of the system, it may be that two legs of the first motor driving circuit 320 are used as the low voltage primary side converting circuit in the second low voltage secondary side converting circuit 400. The bridge arm midpoints of the first bridge arm and the second bridge arm in the first motor driving circuit 320 are respectively connected with the low-voltage isolation conversion circuit in the second low-voltage secondary side conversion circuit, and the low-voltage isolation conversion circuit can comprise a transformer, and the bridge arm midpoints of the first bridge arm and the second bridge arm can be respectively connected with the primary side winding of the low-voltage isolation conversion circuit. The second low voltage secondary side conversion circuit may be connected to the secondary side winding of the isolation conversion circuit and the low voltage load port, respectively.

In one example, when the second low-voltage discharging circuit multiplexes two bridge arms in the first motor driving circuit, the multiplexed two bridge arms can be controlled preferentially according to the normal working condition of the low-voltage primary side converting circuit, and other bridge arms of the circuit can be controlled according to the corresponding adjustment parameters of the multiplexed bridge arms, such as duty ratio, so as to ensure the functions of the motor driving circuit at the same time.

In this example, the first bridge arm, the second bridge arm, the low-voltage isolation conversion circuit and the second low-voltage secondary side conversion circuit together form a second low-voltage discharge circuit 400, and the second low-voltage discharge circuit can step down the high-voltage input by the battery port or the generator and then output the high-voltage input to the low-voltage load port to supply power to the low-voltage load equipment of the system.

In one example of the present embodiment, the second low-voltage discharging circuit 400 includes a low-voltage primary-side converting circuit, and the system further includes a second motor driving circuit 330, where the low-voltage primary-side converting circuit multiplexes the switching tubes of the third bridge arm 3 in the second motor driving circuit 330; at least part of the switching devices of the second low voltage discharge circuit 400 multiplex at least part of the switching devices of the first motor drive circuit 320, including: the low voltage primary side switching circuit multiplexes the switching tubes of the fourth leg 4 of the first motor drive circuit 320.

In one example, as shown in fig. 3, the first motor driving circuit 320 may be a generator control circuit, the second motor driving circuit 330 may be a motor driving circuit, the first motor driving circuit 320 and the second motor driving circuit 330 each include three bridge arms connected in parallel, two switching tubes are disposed on each bridge arm, and the first motor driving circuit and the second motor driving circuit may be connected in parallel on one bus. In this example, the second low-voltage discharging circuit 400 may multiplex any one of the first motor driving circuits as the fourth arm 4, and the second low-voltage discharging circuit 400 may multiplex any one of the second motor driving circuits 320 as the third arm 3, and use two arms of the first motor driving circuit and the second motor driving circuit as the low-voltage primary side converting circuit in the second low-voltage secondary side converting circuit 400. The bridge arm midpoints of the fourth bridge arm 4 and the third bridge arm 3 are respectively connected with a low-voltage isolation conversion circuit in the second low-voltage secondary side conversion circuit, and specifically, the low-voltage isolation conversion circuit can comprise a transformer, and the bridge arm midpoints of the fourth bridge arm 4 and the third bridge arm 3 can be respectively connected with a primary side winding of the low-voltage isolation conversion circuit. The second low voltage secondary side conversion circuit may be connected to the secondary side winding of the isolation conversion circuit and the low voltage load port, respectively.

In one example, when the second low-voltage discharging circuit multiplexes each of the first motor driving circuit and the second motor driving circuit, the two multiplexed legs can be controlled preferentially according to the normal working condition of the low-voltage primary side converting circuit, and the other legs of the circuit can be controlled according to the corresponding adjustment parameters of the multiplexed legs, such as duty ratio, so as to ensure the functions of the motor driving circuit at the same time.

In this example, the third bridge arm, the fourth bridge arm, the low-voltage isolation conversion circuit and the second low-voltage secondary side conversion circuit together form a second low-voltage discharge circuit 400, and the second low-voltage discharge circuit can step down the high-voltage input by the battery port or the generator and then output the high-voltage input to the low-voltage load port to supply power to the low-voltage load equipment of the system.

In one example, the system further comprises a first switch S1 and a second switch S2; the first switch S1 is disposed between the first low voltage discharge circuit 200 and the low voltage load port, or the first switch S1 is disposed between the battery port and the first low voltage discharge circuit 200; the second switch S2 is disposed between the second low voltage discharge circuit 400 and the low voltage load port, or the second switch S2 is disposed between the first motor driving circuit 320 and the low voltage discharge circuit.

As shown in fig. 4 and 5, the system further includes a first switch S1 and a second switch S2, where the first switch is mainly used to control the first low voltage discharge circuit 200 to operate, and the second switch is mainly used to control the second low voltage discharge circuit 400 to operate. In a normal case, the first switch S1 may be in a closed state and the second switch S2 may be in an open state so that all circuits except the second low voltage discharge circuit 400 normally operate, in which case the power supply to the low voltage load may be performed through the first low voltage discharge circuit 200. When the first low-voltage discharging circuit fails, the system can control the first switch S1 to be opened, the second switch S2 to be closed, and direct current input by the battery or the motor driving circuit can be input into the low-voltage load port through the second low-voltage discharging circuit to supply power to the low-voltage load equipment. In addition, since the second low voltage discharge circuit 400 multiplexes the bridge arms in the first motor drive circuit, the first switch may be disposed between the first motor drive circuit 320 and the low voltage isolation switching circuit.

In one example, as shown in fig. 6, when the first low-voltage secondary side conversion circuit 230 in the first low-voltage discharging circuit 200 is coupled with the ac charging circuit, the first switch S1 provided between the first low-voltage discharging circuit and the battery port may be provided between the ac charging circuit 100 and the battery port, and in the case where the voltage adjustment circuit 310 is further provided in the system 1000, may be provided between the ac charging circuit 100 and the voltage adjustment circuit 310.

In one example, the system further comprises an ac charging circuit, the ac charging circuit 100 further comprising a power factor correction circuit 130, a high voltage primary side conversion circuit 140, an isolation conversion circuit 120, and a high voltage secondary side conversion circuit 110; the power factor correction circuit 130, the high-voltage primary side conversion circuit 140, the isolation conversion circuit 120 and the high-voltage secondary side conversion circuit 110 are sequentially connected; the high-voltage primary side conversion circuit 140 is connected with the primary side winding of the isolation conversion circuit 120, and the high-voltage secondary side conversion circuit 110 is connected with the first secondary side winding of the isolation conversion circuit 120; the power factor correction circuit 130 is connected to the ac charging port of the system.

In one example, the ac charging circuit 100 may include a power factor correction circuit 130, a high voltage primary side conversion circuit 140, an isolation conversion circuit 120, and a high voltage secondary side conversion circuit 110 connected in this order, and the high voltage secondary side conversion circuit 110 may be further connected to the voltage adjustment circuit 310, or directly connected to a battery port, and in particular, may be connected to a high voltage side of the voltage adjustment circuit 310. The power factor correction circuit 130 is connected to the ac charging port, and sequentially transmits ac power inputted from the outside to the high voltage secondary side conversion circuit 110 to charge the battery, and conversely, when the battery is discharged, the high voltage secondary side conversion circuit 110 may receive dc power from the battery and discharge a load outside the system 1000 through the power factor correction circuit 130. The high-voltage primary side conversion circuit 140, the isolation conversion circuit 120, and the high-voltage secondary side conversion circuit 110 are integrally formed into a DC-DC conversion circuit for adjusting the voltage of the DC power supply. The power factor correction circuit 130 has a power factor correction and ac-dc conversion function. In addition, the isolation switch 120 is used to electrically isolate the other device from the failure of the high voltage primary switch 140 or the high voltage secondary switch 110.

In one example, the ac charging circuit 100 is also configured to: the external alternating current or the direct current of the battery is output to the first low voltage discharge circuit 200 through the isolation conversion circuit 120.

In one example, a transformer may be included in the isolated switching circuit 120. The transformer may be a three-winding magnetically integrated transformer. The high voltage primary side switching circuit 140 may be connected to the primary winding of the magnetically integrated transformer and the high voltage secondary side switching circuit 110 may be connected to the first secondary winding of the transformer. In another example, the isolated switching circuit 120 may also be provided with a primary side resonant circuit and a secondary side resonant circuit, where the high voltage primary side switching circuit 140 is connected to the primary side winding through the primary side resonant circuit, and similarly the high voltage secondary side switching circuit 110 is connected to the first secondary side winding through the secondary side resonant circuit.

In one example, the first low voltage discharge circuit 200 includes a first low voltage secondary side conversion circuit 230, the first low voltage secondary side conversion circuit 230 being connected to a second secondary side winding of the isolation conversion circuit.

In the system 1000 of the present embodiment, only the first low-voltage secondary side circuit in the first low-voltage discharge circuit may be coupled with the isolation conversion circuit 120 in the ac charging circuit 100, and no other circuit in the first low-voltage power generation circuit is required. Specifically, the low voltage secondary side conversion circuit 230 may be connected to a second secondary winding of the transformer in the isolation conversion circuit 120.

In one example, the low voltage secondary side conversion circuit 230 is configured to receive the output of the high voltage primary side conversion circuit 140 or the high voltage secondary side conversion circuit 110 to power a low voltage load.

In one example, the first low voltage discharge circuit and the battery port may be connected through the ac charging and discharging circuit 100 when the first low voltage secondary side conversion circuit of the first low voltage discharge circuit is coupled with the ac charging circuit 100.

For example, as shown in fig. 6, when the system 1000 charges the battery through the ac charging port, the power factor correction circuit, the high-voltage primary side conversion circuit 140, the isolation conversion circuit 120, the high-voltage secondary side conversion circuit 110, and the voltage adjustment circuit 310 connected to the ac charging port operate in this order. The external alternating current is converted into direct current, and the direct current is output to a battery port after being reduced in voltage, so that the battery is charged. At this time, if the low-voltage load also needs to be powered, the first low-voltage secondary-side converting circuit 230 may receive the output of the high-voltage primary-side converting circuit 130 through the isolation converting circuit 140 to power the low-voltage load.

In another example, system 1000 provides power to an external high voltage load through an ac charging port, or when system 1000 only needs to power a low voltage load device. The voltage adjusting circuit 310 may boost the voltage input from the battery port, input to the high-voltage secondary side conversion circuit 110, and output the high-voltage secondary side conversion circuit 110 to the first low-voltage secondary side circuit through the isolation conversion circuit 120 to supply power to the low-voltage load.

In this example, the high-voltage primary side conversion circuit 140 or the high-voltage secondary side conversion circuit 110 in the ac charging circuit 100 corresponds to the low-voltage primary side conversion circuit in the low-voltage discharging circuit in the related art. In this manner, integrating the low voltage discharge circuit with the ac charging circuit 100 reduces the devices in the system 1000, reduces the cost, and reduces the physical size of the system 1000.

It should be noted that, for different types of low voltage secondary side conversion circuits, the connection manner of the low voltage secondary side conversion circuit and the second secondary side winding may be different. For example, the low-voltage secondary side conversion circuit is a full-wave rectification circuit to which 3 taps may be led out from both ends and the center of the second secondary side winding of the transformer. If the low-voltage secondary side conversion circuit is a double-current rectification circuit or a full-bridge rectification circuit, only 2 taps can be led out from two ends of the second secondary side winding to be connected with the low-voltage secondary side conversion circuit.

In the embodiments of the present application, "high voltage" and "low voltage" are relative concepts and do not represent specific voltage ranges for high voltage and low voltage.

In this embodiment, the low-voltage load device may be a low-voltage battery.

In one example, a system includes a voltage regulation circuit; the first low voltage discharge circuit 200 and the first motor drive circuit 320 are connected to a battery port of the system, comprising: the first low voltage discharge circuit 200 and the first motor driving circuit 320 are connected to a battery port of the system through a voltage adjusting circuit.

In one example, when the system further includes the second motor drive circuit 330 and/or the ac charging circuit 100, the second motor drive circuit 330 or the ac charging circuit 100 may also be connected to a battery port of the system through a voltage adjustment circuit.

In one example, the voltage adjustment circuit may be a step-up circuit or a step-down circuit, such as a boost circuit, a cuk circuit, or the like.

In one example, the low side of the voltage regulation circuit 310 is connected to a battery port; the voltage adjustment circuit 310 is connected to the first motor control circuit 320, the second motor control circuit 330, and the ac charging circuit 100, and includes: the high-voltage side of the voltage adjustment circuit 310 is connected to the first motor control circuit 320, the second motor control circuit 330, and the ac charging circuit 100, respectively.

As shown in fig. 6, the low voltage side of the voltage adjustment circuit 310 may be connected to a battery port of the system 1000, and the high voltage side of the voltage adjustment circuit 310 may be connected to the first motor drive circuit 320, the second motor drive circuit 330, and the ac charging circuit 100, respectively. The voltage adjusting circuit 310 may increase the voltage of the dc power output from the battery and output the voltage to other circuits, or decrease the voltage of the dc power output from other circuits to the voltage adjusting circuit 310 and output the voltage to the battery port. In one example, the voltage adjustment circuit 310 and the first motor driving circuit 320 and the second motor driving circuit 330 may be connected based on the same bus.

In the present embodiment, the ac charging circuit 100 and the first low-voltage secondary side conversion circuit 230 are coupled together through the isolation conversion circuit 120 in the ac charging circuit 100, and at the same time, the ac charging circuit 100 is also connected to the voltage adjustment circuit 310. The problem of potential safety hazard when the vehicle-mounted charger unit and the low-voltage DC-DC conversion unit are integrated in the aspect of power topology is solved. Meanwhile, in this way, the power control circuit 300, the ac charging circuit 100, and the low-voltage secondary side conversion circuit 230 are connected and integrated into one product. And the voltage of the batteries with different specifications can be raised to a specific range by the voltage adjusting circuit 310, so that the power control circuit 300, the alternating current charging circuit 100 and the low-voltage secondary side converting circuit 230 can be adapted to a plurality of batteries with different specifications, and the compatibility and applicability of products are improved. The charge control system 1000 of the present utility model may be applied to a vehicle.

In another embodiment, the high voltage side of the voltage adjustment circuit 310 may be connected to a battery port, and the low voltage side may be connected to at least one of the first motor drive circuit 320, the second motor drive circuit 330, and the ac charging circuit 100, respectively, in contrast to the previous embodiments. On this basis, the voltage adjustment circuit 310 is configured to reduce the output voltage of the battery port and then input the reduced output voltage to at least one of the other circuits. Or the voltage adjusting circuit 310 is used to boost the output voltage of other circuits and input the boosted output voltage to the battery port.

In one example, the ac charging circuit 100 and the motor driving circuit 200 may be provided on the same circuit board.

In one example, the control circuitry may also be provided on the circuit board.

In one example, the switching transistors in the system 1000 may be PMOS transistors or NMOS transistors, and may be flexibly configured according to the actual requirements of the system 1000.

In some embodiments, the control circuitry may issue control signals to control the operation of various circuits in the system 1000 described above, such as: the control signal output from the control circuit to the ac charging circuit 100 causes the switching device of the ac charging circuit 100 to operate. The control circuit may include a control chip, which is not particularly limited herein. Accordingly, the system 1000 is configured to operate in a mode under control of the control circuit, and may include a first low-voltage discharge mode; corresponding to the first low voltage discharge mode, the first switch S1 is closed, the second switch S2 is opened, and the first low voltage discharge circuit 200 is configured to output the dc power output from the battery to the low voltage load port to supply power to the low voltage load device; a second low-voltage discharge mode; corresponding to the second low voltage discharge mode, the second switch S2 is closed, the first switch S1 is opened, and the second low voltage discharge circuit 400 is configured to output the dc power output from the battery to the low voltage load port to supply power to the low voltage load device.

In the first low voltage discharge mode, the first switch S1 may be in a closed state and the second switch S2 may be in an open state, in which case the power supply to the low voltage load may be performed by the first low voltage discharge circuit 200. In the second low-voltage discharging mode, the system can control the first switch S1 to be opened, the second switch S2 to be closed, and direct current input by the battery or the motor driving circuit can be input into the low-voltage load port through the second low-voltage discharging circuit to supply power to the low-voltage load equipment.

In one example, when there is an ac charging circuit in the system, the first motor drive circuit, the second motor drive circuit is a generator control circuit or a motor drive circuit, the system may also implement the following modes of operation: an alternating current charge mode, an inverter discharge mode, and a low voltage discharge mode.

In the ac charging mode, the ac charging circuit 100 is configured to convert external ac power into dc power and output the dc power to the voltage adjustment circuit 310 to charge the battery. In the inverter discharge mode, the ac charging circuit 100 is configured to convert the dc power of the battery input from the voltage adjustment circuit 310 into ac power and supply the ac power to the external device. In the low voltage discharge mode, the low voltage secondary side conversion circuit 230 is configured to output the dc power output from the battery to the low voltage load port through the ac charging circuit 100 to supply power to the low voltage load device; or the low-voltage secondary side conversion circuit 200 is configured to output external alternating current to the low-voltage load port through the alternating current charging circuit 100 to supply power to the low-voltage load device.

In one example, the system further includes a filter circuit 500; the first low voltage discharge circuit 200 and the second low voltage discharge circuit 400 are connected to the low voltage load port through the filter circuit 500, respectively.

As shown in fig. 7, the system further includes a filter circuit 500, and in this example, the filter circuit 500 is an LC filter circuit, but it should be noted that the filter circuit 500 may be another kind of filter circuit.

In general, the secondary side conversion circuits in the first low voltage discharge circuit 200 and the second low voltage discharge circuit 400 may be provided with a filter circuit, so as to improve the power supply effect.

In another example, the filter circuit 500 may also be a filter circuit in the first low-voltage secondary side conversion circuit 200, or a filter circuit in the low-voltage conversion circuit 400.

In one example, the second low-voltage secondary side conversion circuit comprises a first diode and a second diode, the negative stages of the first diode and the second diode are respectively connected with the secondary side winding of the low-voltage isolation conversion circuit, and the positive electrodes of the first diode and the second diode are connected with the grounding end of the low-voltage load port.

As shown in fig. 8, the second low-voltage secondary side conversion circuit in the second low-voltage discharge circuit may replace the MOS transistor with a diode, specifically, may connect the negative electrode of the diode with the secondary side winding of the isolation conversion circuit, and connect the ground ends of the positive low-voltage load ports of the two diodes.

In this example, the MOS transistor in the second low-voltage secondary side conversion circuit may be replaced with a diode, so as to save cost, while the MOS transistor in the first low-voltage discharge circuit is unchanged, on this basis, the second low-voltage discharge circuit may be used as a spare low-voltage discharge circuit, and only when the first low-voltage discharge circuit fails, so that the system has the characteristics of high performance and low cost at the same time.

The novel charge control system comprises two low-voltage discharge circuits, wherein redundancy is formed compared with a single low-voltage discharge circuit, and the problem that the single low-voltage discharge circuit fails to cause the vehicle to break down is avoided; and one of the low-voltage discharge circuits further multiplexes the switching device of the motor drive circuit, integrating the motor drive circuit and the low-voltage discharge circuit into one product. The device is saved, the system integration is improved, meanwhile, two low-voltage discharge circuits are arranged, and under the condition that one of the two low-voltage discharge circuits fails, the other low-voltage discharge circuit is used for supplying power to the low-voltage load, so that the safety of the system is improved.

According to the vehicle provided by the embodiment of the disclosure, the vehicle includes a power battery and the charge control system 1000 according to any of the embodiments described above, and the power battery is connected to a battery port of the charge control system 1000.

In some embodiments, the vehicle further includes a low voltage battery connected to the low voltage load port of the charge control system 1000. In other words, by providing the system 1000, power supply to low voltage load devices configured for the vehicle is achieved.

While certain specific embodiments of the utility model have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims (16)

1. A charge control system, characterized by comprising: a first low-voltage discharge circuit (200), a second low-voltage discharge circuit (400), and a first motor drive circuit (320);

The first low-voltage discharging circuit (200) and the first motor driving circuit (320) are respectively connected with a battery port of the system;

The first low-voltage discharging circuit (200) and the second low-voltage discharging circuit (400) are respectively connected with a low-voltage load port of the system;

At least part of the switching devices of the second low voltage discharge circuit (400) multiplex at least part of the switching devices of the first motor drive circuit (320) and are connected to a battery port of the system through the multiplexed at least part of the switching devices.

2. The system of claim 1, wherein the second low-voltage discharge circuit (400) comprises a low-voltage primary-side conversion circuit;

At least part of the switching devices of the second low voltage discharge circuit (400) multiplex at least part of the switching devices of the first motor drive circuit (320), comprising: the low-voltage primary side conversion circuit multiplexes switching tubes of a first bridge arm (1) and a second bridge arm (2) of the first motor driving circuit (320).

3. The system according to claim 1, characterized in that the second low-voltage discharge circuit (400) comprises a low-voltage primary-side switching circuit, the system further comprising a second motor drive circuit (330), the low-voltage primary-side switching circuit multiplexing switching tubes of a third leg (3) in the second motor drive circuit (330);

At least part of the switching devices of the second low voltage discharge circuit (400) multiplex at least part of the switching devices of the first motor drive circuit (320), comprising: the low-voltage primary side conversion circuit multiplexes the switching tubes of the fourth bridge arm (4) of the first motor drive circuit (320).

4. The system of claim 2, wherein the second low voltage discharge circuit (400) further comprises a low voltage isolation switching circuit and a second low voltage secondary switching circuit;

The bridge arm midpoint of the first bridge arm (1) and the bridge arm midpoint of the second bridge arm (2) are respectively connected with a primary side winding of the low-voltage isolation conversion circuit, one end of the second low-voltage secondary side conversion circuit is connected with a secondary side winding of the low-voltage isolation conversion circuit, and the other end of the second low-voltage secondary side conversion circuit is connected with the low-voltage load port.

5. A system according to claim 3, wherein the second low voltage discharge circuit (400) further comprises a low voltage isolation switching circuit and a second low voltage secondary switching circuit;

The bridge arm midpoint of the third bridge arm (3) and the bridge arm midpoint of the fourth bridge arm (4) are respectively connected with the primary side winding of the low-voltage isolation conversion circuit, one end of the second low-voltage secondary side conversion circuit is connected with the secondary side winding of the low-voltage isolation conversion circuit, and the other end of the second low-voltage secondary side conversion circuit is connected with the low-voltage load port.

6. The system according to claim 1, characterized in that it further comprises a first switch (S1) and a second switch (S2);

The first switch (S1) is disposed between the first low-voltage discharge circuit (200) and the low-voltage load port, or the first switch (S1) is disposed between the battery port and the first low-voltage discharge circuit (200);

The second switch (S2) is disposed between the second low-voltage discharge circuit (400) and the low-voltage load port, or the second switch (S2) is disposed between the first motor drive circuit (320) and the low-voltage discharge circuit.

7. The system of claim 1, further comprising a filter circuit (500);

The first low-voltage discharging circuit (200) and the second low-voltage discharging circuit (400) are respectively connected with the low-voltage load port through the filter circuit (500).

8. The system of claim 1, further comprising an ac charging circuit, the ac charging circuit (100) further comprising a power factor correction circuit (130), a high voltage primary side conversion circuit (140), an isolation conversion circuit (120), and a high voltage secondary side conversion circuit (110);

The power factor correction circuit (130), the high-voltage primary side conversion circuit (140), the isolation conversion circuit (120) and the high-voltage secondary side conversion circuit (110) are sequentially connected;

The high-voltage primary side conversion circuit (140) is connected with a primary side winding of the isolation conversion circuit (120), and the high-voltage secondary side conversion circuit (110) is connected with a first secondary side winding of the isolation conversion circuit (120);

the power factor correction circuit (130) is connected to an ac charging port of the system.

9. The system of claim 8, wherein the first low voltage discharge circuit (200) comprises a first low voltage secondary side conversion circuit connected to a second secondary side winding of the isolation conversion circuit (120).

10. The system of claim 1, wherein the system comprises a voltage regulation circuit;

The first low voltage discharge circuit (200) and first motor drive circuit (320) are connected to a battery port of the system, comprising: the first low-voltage discharging circuit (200) and the first motor driving circuit (320) are connected with a battery port of the system through the voltage adjusting circuit.

11. The system of claim 10, further comprising a second motor drive circuit (330), the second motor drive circuit (330) being connected to a battery port of the system through the voltage regulation circuit.

12. The system of claim 10, further comprising an ac charging circuit (100), the ac charging circuit (100) being connected to a battery port of the system through the voltage regulation circuit.

13. The system of claim 11, wherein the voltage regulation circuit (310) is configured to input the output voltage of the battery port to at least one of the first low voltage discharge circuit (200) and the first motor drive circuit (320) after increasing the output voltage.

14. The system of claim 6, wherein the system is configured to implement at least one of the following modes of operation under control of the control circuit:

A first low-voltage discharge mode; corresponding to the first low voltage discharge mode, the first switch (S1) is closed and the second switch (S2) is open, the first low voltage discharge circuit (200) being configured to output dc power output by the battery to a low voltage load port to power a low voltage load device;

A second low-voltage discharge mode; corresponding to the second low voltage discharge mode, the second switch (S2) is closed and the first switch (S1) is open, the second low voltage discharge circuit (400) being configured to output dc power output by the battery to a low voltage load port to power a low voltage load device.

15. The system of claim 4 or 5, wherein the second low voltage secondary side conversion circuit comprises a first diode and a second diode, the negative stages of the first diode and the second diode are respectively connected with a secondary side winding of the low voltage isolation conversion circuit, and the positive electrodes of the first diode and the second diode are connected with a ground terminal of the low voltage load port.

16. A vehicle comprising a power battery, an electric motor, and a charge control system according to any one of claims 1-15;

the power battery is connected with a battery port of the charging control system.