CN102935812A - Motor driving-charging integrated device with 220 volt alternating current (VAC)/380VAC charging function - Google Patents

Abstract

The invention relates to an electric vehicle motor drive-charging integration technology. In order to solve the defects in the existing electric vehicle technology that the motor drive and the vehicle-mounted high-voltage battery pack charger are independent devices, which occupy a large space in the vehicle, the weight of the vehicle-mounted electrical appliances is large, and at the same time need to be equipped with a high-power fast charging device on the ground, the present invention provides a Motor drive-charging integrated device with 220VAC/380VAC charging function. The device includes a step-up/step-down DC/DC conversion device, a supporting capacitor, a motor-driven inverter bridge, a 380VAC charging conversion switch circuit and a 220VAC charging conversion switch circuit. The invention can improve the efficiency of the inverter bridge of the motor at low speed, and the efficiency of the motor at high speed; the capacity of the inverter bridge can be greatly reduced under the condition of driving an electric vehicle with the same power motor; the ground high-power charging device can no longer be used to realize Fast charging of high voltage battery packs.

Description

A motor drive-charging integrated device with 220VAC/380VAC charging function

technical field

The invention relates to the field of motor drive and battery charging, in particular to the electric vehicle motor drive-charging integration technology. the

Background technique

At present, electric vehicle technology is developing rapidly, and the electric vehicle market is growing day by day, but the motor driver and vehicle high-voltage battery charger of electric vehicles are almost two separate devices, which wastes limited vehicle space and increases the electrical equipment of electric vehicles. acquisition cost. Moreover, the driver only works when the vehicle is running, and is idle when the vehicle is charging, and the on-board high-voltage battery charger is idle when the vehicle is running, and only works when the vehicle is charging, so the utilization rate of the two sets of devices is not high. In addition, in order to realize high-power fast charging under the condition of 380VAC, a high-power charger is necessary, but the high-power charger is large in size and heavy, and cannot be installed on the car, resulting in great restrictions on the charging places of electric vehicles. To overcome this problem, it is necessary to configure a large number of ground chargers everywhere, which requires an extremely huge investment from the country and takes up a large amount of land area. At the same time, it still cannot meet the demand for electric vehicles in remote areas. The above problems seriously restrict the development of electric vehicles. the

Contents of the invention

In order to solve the above problems, the present invention provides a motor drive-charging integrated device with 220VAC/380VAC charging function, so that a set of power electronic drive device can realize the function of motor drive when the vehicle is running, and realize the charging function of the charger when the vehicle is parked and charged. function. Due to the need to meet the capacity requirements of the motor drive, the capacity of the device is much greater than the capacity requirements of the battery during fast charging, so it can meet the requirements of low-power slow charging under 220VAC conditions, and can also meet the requirements of high-power fast charging under 380VAC conditions . That is to say, using a set of motor drive-charging integrated device, the functions of motor drive, vehicle charger and ground high-power charger can still be realized at the cost of the motor drive. Significantly reduce the cost of electric vehicle electrical equipment, cancel the ground charger, save huge operating costs for the country, and make electric vehicles widely used in remote areas. the

In order to achieve the above object, the present invention adopts the following technical solutions:

The present invention provides a motor drive-charging integrated device with 220VAC/380VAC charging function. Bridge, 380VAC charging switch circuit, 220VAC charging switch circuit. the

The step-up (forward) / step-down (reverse) DC/DC conversion device includes 3-way step-up (forward) / step-down (reverse) DC/DC circuits, which are positive at the same time in the motor drive working state In the chopper boost working mode, the three-way chopper boost is staggered with a time delay of 1/3 of the switching cycle to reduce the system ripple current. When the motor is in the regenerative braking state, it is in the reverse chopper step-down working mode at the same time, and the three-way reverse chopper step-down is staggered with a time delay of 1/3 of the switching cycle to reduce the system ripple current. . When working in the 380VAC charging mode, it is the reverse chopper step-down working mode at the same time, and the three-way reverse chopper step-down is staggered with a 1/3 time delay of the switching cycle to reduce the system ripple current. , to realize the high-power fast charging of the vehicle-mounted high-voltage battery pack; when working in the 220VAC charging mode, the two buck-boost inductors are connected in series to the 220VAC circuit, and the 220VAC power supply is equivalent to the 220VAC power supply by controlling the switching power tube (IGBT). It is the back EMF of the surface-mounted sine wave permanent magnet synchronous motor under the condition of power frequency, and the inductance connected in series is equivalent to the main inductance of the permanent magnet synchronous motor, and the rotor flux linkage oriented vector control is carried out under the condition of no position sensor. Only the inductance generates a pumping current to raise the bus voltage on the DC side, and at the same time turn on the third switching power tube (IGBT) in the step-up (forward)/step-down (reverse) DC/DC conversion device to realize the high voltage Slow charging of the battery pack. the

Further, the motor drives the inverter bridge. During the running of the vehicle, when the motor speed is low, that is, when the effective value of the AC fundamental wave voltage required by the motor is less than 0.7 times the voltage of the high-voltage battery pack, the boost (forward) The step-down (reverse) DC/DC conversion device is in the full-pass state, and the high-voltage battery pack directly supplies power to the inverter bridge to drive the motor to work. When the effective value of the AC fundamental wave voltage required by the machine is greater than 0.7 times the voltage of the high-voltage battery pack, the step-up (forward)/step-down (reverse) DC/DC conversion device is in the chopping boost state to maintain the AC fundamental wave voltage The relationship between the effective value and the DC bus voltage of 0.7 times is the optimal modulation ratio state. Through this method, when driving a permanent magnet synchronous motor, the motor can be designed with a higher back EMF, and when the motor rotates at a low speed, a higher Modulation ratio, thereby improving the efficiency of the motor controller, boosting the voltage through the DC/DC conversion device at high speed, maintaining the relationship between the effective value of the AC fundamental wave voltage and the DC bus voltage of 0.7 times, greatly reducing the weak magnetic current, and improving the high-speed operation of the motor time efficiency. At the same time, when the permanent magnet synchronous motor is driven, if the motor needs to slide freely (the driver releases the throttle), it can be realized by directly closing the boost (forward)/buck (reverse) DC/DC conversion device and the inverter bridge. Both completely motor without electricity idling. However, the drive control of the permanent magnet motor of the traditional electric vehicle, since there is no step-up (forward)/step-down (reverse) DC/DC conversion device, must be imitated by zero-torque field-weakening control, that is, the inverter bridge still needs to work. There are large electrical losses. In the 380VAC charging mode, the connection between the motor-driven inverter bridge and the drive motor is disconnected through the 380VAC charging conversion switch circuit, and the 380VAC power supply is connected, and the motor-driven inverter bridge enters the rectification working state, and the 380VAC is rectified into the corresponding DC for power supply. The voltage (forward)/step-down (reverse) DC/DC conversion device works in reverse to charge the high-voltage battery pack. the

Further, when the vehicle is running, the AC output of the inverter bridge is connected to the AC input of the motor to drive the motor; when the 380VAC is charged, the AC output of the inverter bridge is disconnected from the AC input of the motor, and the 380VAC The power supply is connected to realize 380VAC charging of the high-voltage battery pack. the

Compared with the prior art, the invention provides a motor drive-charging integrated device with 220VAC/380VAC charging function, which improves the performance of motor drive. At the same time, the car charger and the ground charger are replaced, which saves the purchase cost of the car charger and the ground charger. the

Description of drawings

Fig. 1 is a schematic diagram of the topological structure of a motor drive-charging integrated device with 220VAC/380VAC charging function provided by the present invention. the

In the figure: 1. Step-up (forward)/step-down (reverse) DC/DC conversion device, 2. Motor-driven inverter bridge, 3. Support capacitor, 4. 220VAC charging conversion switch circuit, 5. 380VAC charging conversion Switching circuit, 6. Step-up (forward)/step-down (reverse) DC/DC conversion device, the step-up and step-down inductance that is always connected to the high-voltage battery pack, 7. Step-up (forward)/step-down (reverse) ) The buck-boost inductance connected to the 220VAC charging conversion switch circuit in the DC/DC conversion device, 8. The buck-boost inductor connected to the 220VAC charging conversion switch circuit in the boost (forward)/buck (reverse) DC/DC conversion device Sensation, 9, 220VAC charging interface, 10, 380VAC charging interface, 11, permanent magnet synchronous motor, 12, high voltage battery pack. the

Detailed ways

Hereinafter, specific embodiments of the present invention will be described in detail in conjunction with the accompanying drawings. the

As shown in Figure 1, the present invention provides a motor drive-charging integrated device with 220VAC/380VAC charging function, which includes a step-up (forward)/step-down (reverse) DC/DC conversion device 1 , support capacitor 3, motor-driven inverter bridge 2, 380VAC charging switch circuit 5, 220VAC charging switch circuit 4. the

When the vehicle is running normally: the 380VAC charging switching circuit 5 connects the main drive motor with the motor-driven inverter bridge 2, and the 220VAC charging switching circuit 4 connects the two-way buck-boost inductors 7, 8 and the high-voltage battery pack 12 connected to it. Unicom. When driving the permanent magnet synchronous motor 11, when the motor speed is low, the effective value of the AC fundamental wave voltage required by the motor is less than 0.7 times the voltage of the high-voltage battery pack 12, step-up (forward)/step-down (reverse) The DC/DC conversion device 1 is in an all-through state, and the high-voltage battery pack 12 directly supplies power to the inverter bridge 2 to drive the motor to work. When the motor speed is high, the effective value of the AC fundamental wave voltage required to drive the permanent magnet synchronous motor 11 is greater than 0.7 times the voltage of the high-voltage battery pack 12, the step-up (forward)/step-down (reverse) DC/DC conversion Device 1 is in the chopper boost state, and the three-way chopper boost is staggered with a time delay of 1/3 of the switching cycle to reduce the system ripple current and maintain the effective value of the AC fundamental wave voltage and the DC bus voltage The relationship of 0.7 times is the optimal modulation ratio state. When it is necessary to drive the permanent magnet synchronous motor 11 for regenerative braking, when the motor speed is low, and the effective value of the AC fundamental wave voltage required by the motor is less than 0.7 times the voltage of the high-voltage battery pack 12, the step-up (forward)/step-down ( Reverse) DC/DC conversion device 1 is in an all-through state. When the motor speed is high, that is, when the effective value of the AC fundamental wave voltage required by the motor is greater than 0.7 times the voltage of the high-voltage battery pack 12, the step-up (forward)/step-down (reverse) DC/DC conversion device 1 is in the reverse direction. In the wave step-down state, the three-way chopper will stagger the voltage with a time delay of 1/3 of the switching cycle to reduce the system ripple current and maintain the relationship between the effective value of the AC fundamental wave voltage and the 0.7 times of the DC bus voltage. It is the optimal modulation ratio state. When the motor needs to slide freely, the step-up (forward)/step-down (reverse) DC/DC conversion device 1 and the motor-driven inverter bridge 2 are turned off to realize free slide without current. the

When the vehicle is parked at 220VAC low power and slow charging: the 380VAC charging switch circuit 5 connects the main drive motor with the motor-driven inverter bridge 2, and the 220VAC charging switch circuit 4 connects the two-way buck-boost inductors 7 and 8 Connect with the 220VAC charging interface 9, and the motor drives the inverter bridge 2 to stop working. The 220VAC power supply is equivalent to the back electromotive force of the surface-mounted sine wave permanent magnet synchronous motor under the condition of power frequency, and the inductance connected in series is equivalent to the main inductance of the permanent magnet synchronous motor, and the rotor flux orientation is carried out under the condition of no position sensor Vector control, generate pumping current in these two inductors, raise the bus voltage on the DC side, and simultaneously turn on the boost (forward)/buck (reverse) DC/DC conversion device 1 and the direct-connected high-voltage battery pack The upper bridge arm of the IGBT half-bridge connected to the buck-boost inductance of 12 realizes the slow charging of the high-voltage battery pack 12. the

When the vehicle is parked and charged at a high power and slow speed at 380VAC: the 380VAC charging conversion switch circuit 5 disconnects the permanent magnet synchronous motor 11 from the motor-driven inverter bridge 2, connects the 380VAC charging interface 10 to the motor-driven inverter bridge 2, and converts 220VAC charging The switch circuit 4 connects the two-way buck-boost inductors 7 and 8 connected to it with the high-voltage battery pack 12, and the motor drives the inverter bridge 2 to stop working, and the boost (forward)/buck (reverse) DC/DC conversion Device 1 works in reverse. Since the motor-driven inverter bridge 2 stops working and enters the rectification state, the 380VAC is rectified into the corresponding DC for the step-up (forward)/step-down (reverse) DC/DC conversion device 1 to work in reverse, and the step-up (forward) )/step-down (reverse) DC/DC conversion device 1, the three-way choppers simultaneously operate in the reverse chopper step-down mode, and the three-way reverse chopper step-down is performed with a time delay of 1/3 of the switching period staggered Step-down chopper operation reduces system ripple current and realizes high-power fast charging of the vehicle-mounted high-voltage battery pack 12 . the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. All equivalent changes and modifications made according to the contents of the present invention are covered within the patent scope of the present invention. the

Claims (5)

1. motor-driven-charging integrated device with 220VAC380VAC charge function, it is characterized in that described boosting (forward)/step-down (oppositely) DC/DC converting means, Support Capacitor, motor-driven inverter bridge, 380VAC battery charging switch circuit, 220VAC battery charging switch circuit.

Described this motor-driven-charging integrated device can utilize same set of device when Vehicle Driving Cycle, and the control motor is realized driving the regenerative braking function; When stopping, access 220VAC single phase alternating current can be realized the miniwatt of on-board high-voltage battery pack is charged at a slow speed; When stopping, access 380VAC three plase alternating current can be realized the high-power fast charge to the on-board high-voltage battery pack.

2. as claimed in claim 1 boosting (forward)/step-down (oppositely) DC/DC converting means, it is characterized in that described boosting (forward)/step-down (oppositely) DC/DC converting means, Support Capacitor, motor-driven inverter bridge, 380VAC battery charging switch circuit, 220VAC battery charging switch circuit.

Described boosting (forward)/step-down (oppositely) DC/DC converting means comprises 3 tunnel (forward)/step-down (oppositely) DC/DC circuit that boost, under the motor-driven mode of operation, be simultaneously the forward copped wave mode of operation of boosting, when motor is to be simultaneously reverse chopping depressuring mode of operation under the regenerative braking state, when being operated under the 380VAC charge mode, be reverse chopping depressuring mode of operation simultaneously, realize the high-power fast charge to the on-board high-voltage battery pack; When being operated under the 220VAC charge mode, wherein two-way buck inductance is connected in series in the 220VAC circuit, in these two inductance, produce pump by master cock power tube (IGBT) and rise electric current, raise the DC side bus voltage, simultaneously conducting the 3rd switching power tube (IGBT) in (forward)/step-down (oppositely) DC/DC converting means that boost, realization is to the at a slow speed charging of high-tension battery group.

3. a motor-driven inverter bridge structure as claimed in claim 1 or 2 is characterized in that described boosting (forward)/step-down (oppositely) DC/DC converting means, motor-driven inverter bridge, 380VAC battery charging switch circuit.

Described motor-driven inverter bridge, in the Vehicle Driving Cycle process, when motor speed is low, when both the interchange fundamental voltage effective value that needs of motor is less than 0.7 times of high-tension battery group voltage, (forward)/step-down (oppositely) DC/DC converting means that boosts is in the all-pass state, the high-tension battery group directly supplies electric drive motor work to inverter bridge, the interchange fundamental voltage effective value that needs when motor is during greater than 0.7 times of high-tension battery group voltage, (forward)/step-down (oppositely) DC/DC converting means that boosts is in the copped wave pressure-increasning state, keep exchanging fundamental voltage effective value and 0.7 times of relation of DC bus-bar voltage, both optimal modulation compared state; Under the 380VAC charge mode, by being connected of 380VAC battery charging switch circuit disjunction inverter bridge and drive motor, the 380VAC power supply is accessed, inverter bridge enters the rectification mode of operation, be corresponding direct current with the 380VAC rectification, for boosting (forward)/step-down (oppositely) DC/DC converting means reverse operation, be the charging of high-tension battery group.

4. a 380VAC battery charging switch circuit as claimed in claim 1 or 2 is characterized in that, when at Vehicle Driving Cycle, the interchange output of inverter bridge is connected with the interchange input of motor, and realization is to the driving of motor; The input that exchanges of the interchange output of disjunction inverter bridge and motor when 380VAC charges with the access of 380VAC power supply, realizes that 380VAC is to the charging of high-tension battery group.

5. 220VAC battery charging switch circuit as claimed in claim 1, it is characterized in that, when at Vehicle Driving Cycle, the output of the direct current of high-tension battery group stream is connected with two-way buck inductance in (forward)/step-down (oppositely) DC/DC converting means that boosts, and realization is to the driving of motor; The above-mentioned two-way buck of disjunction inductance connects when 220VAC charges, and it is connected with the 220VAC power supply, realizes that 220VAC is to the charging of high-tension battery group.

Images