A device that realizes charging equivalently using an on-board charger based on a dual-winding motor control topology

Abstract

The present invention discloses a device that equivalently realizes charging by an in-vehicle charger based on a dual-winding motor control topology. The device includes a battery module, a switch assembly, a first-phase bridge arm, a second-phase bridge arm, a third-phase bridge arm, a fourth-phase bridge arm, a fifth-phase bridge arm, a sixth-phase bridge arm, a seventh-phase bridge arm, a capacitor C1, a capacitor C2, a first winding, a second winding, a third winding, a fourth winding, a fifth winding, and a sixth winding. By controlling the on / off of the switch assembly, it enters a first operating mode and a second operating mode. The first operating mode is a dual-winding motor control mode, where the switch assembly is controlled to cut off the first-phase bridge arm, and the capacitor C1, the second-phase bridge arm, the third-phase bridge arm, and the fourth-phase bridge arm constitute a first dual-winding motor power control module. The present invention does not require the in-vehicle charger to be a separate and independent module, greatly multiplexes the hardware topology under dual-winding motor control, and realizes two functions with one topology.

Description

[Technical Field]

[0001] The present invention relates to the technical field of new energy vehicles, and more particularly to a device for equivalently realizing charging by an on-board charger based on a dual-winding motor control topology. [Background technology]

[0002] Batteries are an important factor restricting the development of electric vehicles. Compared with lead-acid batteries and nickel-ion batteries, lithium batteries have advantages such as high energy density, long average service life, high single-cell operating voltage and current, high power density, non-toxicity, and low cost, and are therefore widely used in the field of electric vehicles. At present, electric vehicle users generally pay attention to battery charging issues.

[0003] A charging pile is a non-onboard charging device that is usually installed at a fixed operating location and can directly supply DC voltage to the battery pack of an electric vehicle, offering the advantages of large charging power and fast charging speed. However, since the charging location is fixed and portability is poor, an onboard charger can provide a more convenient charging method than a charging pile.

[0004] Due to the limited space inside a vehicle, on-board chargers must be small in volume and weight, and from the user's perspective, high charging efficiency is required. At the same time, satisfying user requirements for functionality while minimizing hardware costs is also an important issue that developers must consider.

[0005] Currently, an on-board charger must be added to the hardware configuration of an electric vehicle as a separate module, and related optimization solutions are developed for the entire module. Therefore, in response to the above discussion, it is desirable to develop a new on-board charger alternative that can effectively resolve the space limitations of electric vehicles, reduce the overall hardware cost, and maximize charging efficiency.

[0006] For example, Chinese Patent Application No. CN202110732515.0 discloses an on-board integrated charger drive circuit based on a dual three-phase permanent magnet synchronous motor drive system. The system operates in multiple functional modes, such as electric drive, charging, and V2G. The electric drive, high-rated inverter, and motor winding can all be multiplexed, eliminating the need for additional components and reducing costs. However, the technical solution in this application has problems such as low charging efficiency and large heat generation. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention mainly solves the problems of the prior art, such as the need to provide a separate on-board charger, which takes up a large amount of space and results in low charging efficiency, and provides a device that equivalently realizes charging via an on-board charger based on a dual-winding motor control topology, which multiplexes one set of hardware equipment and simultaneously achieves the functional needs of dual-winding motor control and on-board charger charging, saving equipment space while offering significant cost benefits and higher charging efficiency. [Means for solving the problem]

[0008] The above object of the present invention is mainly achieved by the following technical means: A device for equivalently realizing charging by an on-board charger based on a double-winding motor control topology, the device including a battery module, a switch assembly, a first-phase bridge arm, a second-phase bridge arm, a third-phase bridge arm, a fourth-phase bridge arm, a fifth-phase bridge arm, a sixth-phase bridge arm, a seventh-phase bridge arm, a capacitor C1, a capacitor C2, a first winding, a second winding, a third winding, a fourth winding, a fifth winding, and a sixth winding, wherein a first operating mode and a second operating mode are established by controlling the on / off of the switch assembly, and the first operating mode is The mode is a double-winding motor control mode, in which the switch assembly is controlled to cut off the first phase bridge arm, the capacitor C1, the second phase bridge arm, the third phase bridge arm, and the fourth phase bridge arm constitute a first double-winding motor power control module, the first winding, the second winding, and the third winding constitute a first double-winding motor winding module, the capacitor C2, the fifth phase bridge arm, the sixth phase bridge arm, and the seventh phase bridge arm constitute a second double-winding motor power control module, and the fourth winding , the fifth winding and the sixth winding constitute a second double-winding motor winding module, and in the double-winding motor control mode, the battery module outputs power to the first double-winding motor power control module and the second double-winding motor power control module, the first double-winding motor power control module outputs a PWM signal to the first double-winding motor winding module, and the first double-winding motor winding module drives the motor to operate, and the second double-winding motor power control module outputs a PWM signal to the second double-winding motor winding module, and the second double-winding motor winding module a dual-winding motor winding module drives a motor to operate, the second operating mode is an on-board charger charging mode, and the switch assembly is controlled so that one end of the first winding and a midpoint of a first phase bridge arm are connected to both ends of a commercial power supply, the first phase bridge arm, the second phase bridge arm, and a capacitor C1 constitute a PFC inverter circuit module, the third phase bridge arm and the fourth phase bridge arm constitute an inverter module, and the second winding, the third winding, the fifth winding, and the sixth winding constitute an isolation transformer module;The sixth-phase bridge arm, the seventh-phase bridge arm, and the capacitor C2 constitute a rectifier module, and the fifth-phase bridge arm is in a cutoff state. In the charger charging mode, the power from the commercial power supply is input to the PFC inverter circuit module, and after power correction by the PFC inverter circuit module, it is input to the inverter module, and the DC current is converted to AC current, which is then input to the isolation transformer module for boosting. The boosted current is input to the rectifier module, and the AC current is converted to DC current to charge the battery module.

[0009] Preferably, the switch assembly includes a relay K1, a relay K2, a relay K3, a relay K4, a relay K5, and a relay K6, and in the dual-winding motor control mode, the relays K1, K2, K5, and K6 are controlled to be on and the relays K3 and K4 are controlled to be off, and in the on-board charger charging mode, the relays K1, K2, K5, and K6 are controlled to be off and the relays K3 and K4 are controlled to be on.

[0010] Preferably, the second winding and the third winding are connected in series to form the primary side of an isolation transformer, and the fifth winding and the sixth winding are connected in series to form the secondary side of the isolation transformer.

[0011] Preferably, the first winding, the second winding and the third winding are symmetrical windings and star-connected to form a first double-winding motor winding module.

[0012] Preferably, the fourth, fifth and sixth windings are symmetrical windings and star-connected to form a second double-winding motor winding module.

[0013] Preferably, a relay K5 is provided between the first winding and the star connection midpoint of the first double-winding motor winding module, and a relay K6 is provided between the midpoint of the fifth-phase bridge arm and the fourth winding. By controlling the on / off of relays K5 and K6, the configuration of the first double-winding motor winding module in the double-winding motor control mode and the isolation transformer formed by the series connection of windings in the on-board charger charging mode can be switched.

[0014] Preferably, the relay K3 is provided between the midpoint of the first phase bridge arm and the L terminal of the commercial power supply, and the relay K4 is provided between the first winding and the N terminal of the commercial power supply. Relays K4 and K5 form a double-pole double-throw switch, and by controlling the on-state of relays K5 and K6, AC power is input from the commercial power supply in the on-board charger charging mode.

[0015] Preferably, the first winding, the second winding and the third winding have the same electrical resistance and inductance characteristics.

[0016] Preferably, the fourth winding, the fifth winding and the sixth winding have the same electrical resistance and inductance characteristics. [Effects of the Invention]

[0017] The beneficial effects of the present invention are as follows: (1) The on-board charger does not need to be a separate, independent module; the hardware topology under dual-winding motor control is multiplexed to a great extent, achieving two functions with one topology; (2) By multiplexing devices in the dual-winding motor control topology to achieve on-board charging, charging efficiency can be effectively improved; (3) During the hardware modification process, only a small number of power switch devices and relay devices are added to simultaneously achieve the functions of dual-winding motor control and on-board charger charging, significantly reducing overall costs; and since the two functions are independent of each other, the actual control complexity is not increased, resulting in a simple structure and low cost. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic diagram of a topology structure in a dual winding motor control mode according to an embodiment of the present invention; [Figure 2] 2 is a schematic diagram of a topology structure in a charging mode of an on-board charger according to an embodiment of the present invention; FIG. [Figure 3] 4 is a schematic diagram of a relay control operation condition for switching between a dual-winding motor control mode and an on-board charger charging mode according to an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present invention will be described using specific examples, but those skilled in the art will easily understand other advantages and effects of the present invention from the contents disclosed herein. The present invention may be implemented or applied in different specific embodiments, and various supplements or modifications may be made to the details of the present specification based on different perspectives and applications without departing from the spirit of the present invention. In addition, the following examples and features in the examples may be combined with each other unless they are inconsistent.

[0020] In order to clarify the objectives, technical means and advantages of the present invention, the technical means in the embodiments of the present invention will be described in more detail with reference to the following examples and drawings. It should be understood that the specific examples described herein are only for the purpose of illustrating the present invention, and are not intended to limit the present invention.

[0021] (Example) In an apparatus that equivalently realizes charging by an on-board charger based on a dual-winding motor control topology, as shown in Figure 1, the configuration in dual-winding motor control mode includes a battery module, a first dual-winding motor power control module, a first dual-winding motor winding module, a second dual-winding motor power control module, and a second dual-winding motor winding module.

[0022] In the battery module, the positive and negative electrodes of the battery are connected to Node 1 and Node 2, respectively. Two paths are drawn out from each, connected to the upper and lower ends of the first and second double-winding motor power control modules, respectively, and DC voltage is supplied to the two-path three-phase inverter circuits. In one of the paths, a pair of upper and lower bridge arms Q1 and Q2 are connected in parallel between the battery in the module and capacitor C1 in the first double-winding motor power control module. Each bridge arm is equipped with a power switch tube and a freewheeling diode. Relay K1 is connected to the path connected to the upper end of bridge arm Q1, and Node 1 is drawn out. Relay K2 is connected to the path connected to the lower end of bridge arm Q2, and Node 2 is drawn out. Relay K3 is drawn out from the midpoint between the upper and lower bridge arms Q1 and Q2, and Node L is drawn out. Node L is connected to the L terminal of the commercial power module. In the other path, no additional associated power devices and relay switch devices are provided. In the double-winding motor control mode, relays K1 and K2 are turned on and relay K3 is turned off, so that bridge arms Q1 and Q2 are both cut off, and bridge arms Q1 and Q2 form the first-phase bridge arms. In this mode, bridge arms Q1 and Q2 are somewhat redundant, but are an essential component in the on-board charger charging mode.

[0023] The first double-winding motor power control module comprises a capacitor C1 and a three-phase bridge arm, the upper and lower ends of which are connected to the upper and lower ends of the three-phase inverter circuit bridge arm, including a second-phase bridge arm, a third-phase bridge arm and a fourth-phase bridge arm, each phase being divided into two upper and lower bridge arms, each bridge arm being connected to a power switch tube and a freewheeling diode, the basic block UT1 being the upper bridge arm of the first-phase bridge arm, QU B1 is the 1The basic block VT1 is the lower bridge arm of the first-phase bridge arm, and the two blocks are connected to each other with their midpoints connected to the first winding La1 of the first double-winding motor winding module. The basic block VT1 is the upper bridge arm of the second-phase bridge arm, and the basic block VB1 is the lower bridge arm of the second-phase bridge arm, and the two blocks are connected to each other with their midpoints connected to the second winding Lb1 of the first double-winding motor winding module. The basic block WT1 is the upper bridge arm of the third-phase bridge arm, and the basic block WB1 is the lower bridge arm of the third-phase bridge arm, and the two blocks are connected to each other with their midpoints connected to the third winding Lc1 of the first double-winding motor winding module. The three-phase bridge arm's midpoint is connected to the three-phase winding of the first double-winding motor winding module. By controlling the gate signals of the power tubes of each bridge arm, the first double-winding motor power control module outputs PWM waves to drive the first double-winding motor winding module.

[0024] The first double-winding motor winding module is composed of a star-connected three-phase symmetrical winding consisting of a first winding La1, a second winding Lb1, and a third winding Lc1, all of which have the same electrical resistance and inductance characteristics. A double-pole double-throw switch is disposed in the link connecting the first winding La1 to the star midpoint. Relay K5 controls the connection between the first winding La1 and the star midpoint, and relay K4 controls the connection between the first winding La1 and node N, which is connected to terminal N of the commercial power supply module. When relay K4 is turned off and relay K5 is turned on, normal operation of the winding module in motor drive mode is ensured.

[0025] The second double-winding motor power control module consists of a capacitor C2 and three-phase bridge arms, including a fifth-phase bridge arm, a sixth-phase bridge arm, and a seventh-phase bridge arm. Each phase is divided into two bridge arms, one above the other, each with a power switch tube and a freewheeling diode connected to it. The basic block UT2 is the upper bridge arm of the fifth-phase bridge arm, and the basic block UB2 is the lower bridge arm of the fifth-phase bridge arm. The two blocks are connected together. The midpoints of the bridge arms are connected to the fourth set La2 of the second double-winding motor winding module, and a relay K6 is located in the path. The basic block VT2 is the upper bridge arm of the sixth-phase bridge arm, and the basic block VB2 is the lower bridge arm of the sixth-phase bridge arm. The two blocks are connected together, and the midpoints of the bridge arms are connected to the fifth winding Lb2 of the second double-winding motor winding module. The WT2 basic block is the upper bridge arm of the seventh-phase bridge arm, and the WB2 basic block is the lower bridge arm of the seventh-phase bridge arm. The two blocks are connected together, and the midpoints of the bridge arms are connected to the sixth winding Lc2 of the second double-winding motor winding module, controlling relay K6 to turn on. The midpoints of the three-phase bridge arms are connected to the three-phase windings of the second double-winding motor winding module. By controlling the gate signals of the power tubes of each bridge arm, the second double-winding motor power control module outputs PWM waves to drive the second double-winding motor winding module.

[0026] The second double-winding motor winding module is composed of a star-connected fourth winding La2, a fifth winding Lb2, and a sixth winding Lc2, which are three-phase symmetrical windings. The fourth winding La2, the fifth winding Lb2, and the sixth winding Lc2 have the same electrical resistance and inductance characteristics, and the PWM signal from the second double-winding motor power control module is wave The drive is controlled by

[0027] In the dual-winding motor control mode, the battery module simultaneously drives and controls the first dual-winding motor winding module and the second dual-winding motor winding module by the first dual-winding motor power control module and the second dual-winding motor power control module, respectively.

[0028] FIG. 2 shows the configuration of an on-board charger in charging mode according to the present invention, which includes a commercial power supply module, a PFC inverter circuit module, an inverter module, an isolation transformer module, a rectifier module, and a battery module.

[0029] For the commercial power supply module, in on-board charger charging mode, relays K3 and K4 are controlled to be on, relays K1 and K2 are turned off, the N terminal of the commercial power supply is connected to connection point N, and the L terminal of the commercial power supply is connected to connection point L, thereby realizing power transmission to the PFC inverter circuit.

[0030] In the PFC inverter circuit module, by turning off relay K5, the first winding La1 is removed from the star connection in motor control mode and placed in the PFC inverter circuit module as a single resistor-inductor element. Bridge arms Q1 and Q2 are switched from the cutoff state in dual-winding motor control mode to the enabled state, and bridge arms UT1, UB1, Q1, and Q2 form a two-phase bridge arm, with both the upper and lower ends simultaneously connected in parallel to capacitor C1. The on / off of each bridge arm is controlled by its gate signal, jointly realizing PFC inverting boost.

[0031] In the inverter module, a two-phase bridge arm is formed by bridge arm VT1, bridge arm VB1, bridge arm WT1, and bridge arm WB1, and the inverter function is realized by controlling the gate signal of each power switch tube, and a high-frequency alternating voltage is output.

[0032] In the isolation transformer module, by turning off relays K5 and K6, the first winding La1 and the fourth winding La2 are disconnected from the star connection in motor control mode, and the second winding Lb1 and the third winding Lc1 are automatically connected in series to form the primary side of the transformer. The fifth winding Lb2 and the sixth winding Lc2 are automatically connected in series to form the secondary side of the transformer. The number of turns of the two windings is rationally arranged to achieve the transformation function of the isolation transformer. The number of turns of the three-phase windings in the first double-winding motor winding module and the three-phase windings in the second double-winding motor winding module are different. This is used to control the turns ratio between the primary and secondary sides of the isolation transformer module when switching to on-board charger charging mode, thereby achieving the boost function of the module. The number of turns of the windings can be rationally set according to actual demand, and the boost demand of the isolation transformer module can be achieved.

[0033] The rectifier module consists of bridge arm VT2, bridge arm VB2, bridge arm WT2, and bridge arm WB2, which form a two-phase bridge arm. The upper and lower ends of the bridge arm are connected to both ends of capacitor C2, respectively. The rectifier function is realized by controlling the gate signals of each power switch tube, and a DC charging voltage is output to charge the battery.

[0034] At this time, the relays K1 and K2 of the battery module are controlled to be turned off, and the battery is structurally connected only to the rectifier module and is charged by receiving the power output from the rectifier module.

[0035] As shown in Figure 3, the conditions for switching between the dual-winding motor control mode and the on-board charger charging mode are as follows: In the on-board charger charging mode, relays K1, K2, K5, and K6 are controlled to be off, and relays K3 and K4 are controlled to be on; in the dual-winding motor control mode, relays K1, K2, K5, and K6 are controlled to be on, and relays K3 and K4 are controlled to be off.

[0036] All power switch tubes and relay switches in the topology structure of the present invention may be replaced by any device with similar switching characteristics.

[0037] The above-described embodiments are merely preferred solutions of the present invention, and do not limit the present invention in any way. There are other modifications and improvements available, provided that they do not exceed the technical solutions set forth in the claims.

Claims

1. An apparatus for equivalently realizing charging by an on-board charger based on a dual-winding motor control topology, comprising: the power supply includes a battery module, a switch assembly, a first phase bridge arm, a second phase bridge arm, a third phase bridge arm, a fourth phase bridge arm, a fifth phase bridge arm, a sixth phase bridge arm, a seventh phase bridge arm, a capacitor C1, a capacitor C2, a first winding, a second winding, a third winding, a fourth winding, a fifth winding, and a sixth winding; The first and second operating modes are achieved by controlling the on / off of the switch assembly; The first operating mode is a double-winding motor control mode, in which the switch assembly is controlled to cut off the first phase bridge arm, the capacitor C1, the second phase bridge arm, the third phase bridge arm, and the fourth phase bridge arm constitute a first double-winding motor power control module, the first winding, the second winding, and the third winding constitute a first double-winding motor winding module, the capacitor C2, the fifth phase bridge arm, the sixth phase bridge arm, and the seventh phase bridge arm constitute a second double-winding motor power control module, and the fourth winding, the fifth winding, and the sixth winding the line forms a second double-winding motor winding module, and in the double-winding motor control mode, the battery module outputs power supply to the first double-winding motor power control module and the second double-winding motor power control module, the first double-winding motor power control module outputs a PWM signal to the first double-winding motor winding module, the first double-winding motor winding module drives the motor to operate, the second double-winding motor power control module outputs a PWM signal to the second double-winding motor winding module, the second double-winding motor winding module drives the motor to operate; the second operating mode is an on-board charger charging mode, in which the switch assembly is controlled so that one end of the first winding and a midpoint of a first phase bridge arm are connected to opposite ends of the commercial power supply; the first phase bridge arm, the second phase bridge arm, and a capacitor C1 constitute a PFC inverter circuit module; the third phase bridge arm and the fourth phase bridge arm constitute an inverter module; the second winding, the third winding, the fifth winding, and the sixth winding constitute an isolation transformer module; the sixth phase bridge arm, the seventh phase bridge arm, and a capacitor C2 constitute a rectifier module; and the fifth phase bridge arm is in a cut-off state. In the charger charging mode, power from the commercial power supply is input to the PFC inverter circuit module, where it is power-corrected and then input to the inverter module, where it is converted from DC to AC and then input to the isolation transformer module for boosting, and the boosted current is input to the rectifier module, where it is converted from AC to DC to charge the battery module.

2. The switch assembly includes a relay K1, a relay K2, a relay K3, a relay K4, a relay K5, and a relay K6, In the double-winding motor control mode, the relays K1, K2, K5, and K6 are controlled to be on, and the relays K3 and K4 are controlled to be off.

2. The device for equivalently realizing charging by an on-board charger based on a double-winding motor control topology as described in claim 1, wherein, in the on-board charger charging mode, the relays K1, K2, K5, and K6 are controlled to be off, and the relays K3 and K4 are controlled to be on.

3. 3. A device for equivalently realizing charging by an on-board charger based on the double-winding motor control topology according to claim 1 or 2, wherein the second winding and the third winding are connected in series to form a primary side of an isolation transformer, and the fifth winding and the sixth winding are connected in series to form a secondary side of the isolation transformer.

4. 3. The device for equivalently realizing charging by an on-board charger based on a dual-winding motor control topology according to claim 2, wherein the first winding, the second winding, and the third winding are symmetrical windings and star-connected to form a first dual-winding motor winding module.

5. 5. The device for equivalently realizing charging by an on-board charger based on a dual-winding motor control topology according to claim 4, wherein the fourth winding, the fifth winding, and the sixth winding are symmetrical windings and star-connected to form a second dual-winding motor winding module.

6. 6. The device for equivalently realizing charging by an on-board charger based on a double-winding motor control topology as claimed in claim 5, wherein a relay K5 is provided between the first winding and a star connection midpoint of the first double-winding motor winding module, and a relay K6 is provided between the midpoint of the fifth-phase bridge arm and the fourth winding, and the on / off switching of relays K5 and K6 is controlled to switch between the first double-winding motor winding module in the double-winding motor control mode and the isolation transformer formed by the series connection of windings in the on-board charger charging mode.

7. 3. The device for equivalently realizing charging by an on-board charger based on a double-winding motor control topology according to claim 2, wherein the relay K3 is provided between the midpoint of the first phase bridge arm and the L terminal of the commercial power supply, the relay K4 is provided between the first winding and the N terminal of the commercial power supply, the relays K4 and K5 form a double-pole double-throw switch, and the input of AC power from the commercial power supply in the on-board charger charging mode is realized by controlling the on-state of the relays K5 and K6.

8. 2. The device for equivalently realizing charging by an on-board charger based on a double-winding motor control topology as described in claim 1, wherein the first winding, the second winding, and the third winding have the same electrical resistance and inductance characteristics.

9. 2. The device for equivalently realizing charging by an on-board charger based on a double-winding motor control topology as described in claim 1, wherein the fourth winding, the fifth winding, and the sixth winding have the same electrical resistance and inductance characteristics.

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