WO2014026460A1

WO2014026460A1 - Conversion device integrated with switched reluctance motor drive and low-voltage battery charging

Info

Publication number: WO2014026460A1
Application number: PCT/CN2012/087909
Authority: WO
Inventors: 梁嘉宁; 徐国卿; 蹇林旎; 李卫民; 常明; 王亮荣
Original assignee: 深圳先进技术研究院
Priority date: 2012-08-14
Filing date: 2012-12-28
Publication date: 2014-02-20
Also published as: CN102843078A

Abstract

A conversion device integrated with switched reluctance motor drive and low-voltage battery charging, comprising a high-voltage energy storage module, a drive module connected to the high-voltage energy storage module, and a control module connected to the drive module, and also comprising a DC-DC conversion module connected to the control module and the drive module, and a low-voltage energy storage module which stores low-voltage electric energy and supplies power to a low-voltage device. The control module controls the drive module and the low-voltage energy storage module to operate according to a preset program. The drive module drives a switched reluctance motor to operate and is used for receiving an instruction from the control unit to drive the DC-DC conversion module and charging the electric energy of the high-voltage energy storage module to the low-voltage energy storage module. The conversion device is integrated with the functions of switched reluctance motor drive and low-voltage battery charging simultaneously, thereby being able to not only save the space of a device, but also achieve the time-sharing multiplexing of the device, and thus the costs of elements and the wiring complexity of a circuit board are greatly reduced, so that the hardware structure thereof is more compact.

Description

Conversion device for integrated switched reluctance motor drive and low voltage battery charging

[0001] The present invention relates to a switched reluctance motor drive system, and more particularly to an integrated switch reluctance motor drive and a low voltage battery charge change device.

Background technique

[0002] Switched reluctance motor is a new type of speed-regulating motor. The speed-regulating system has the advantages of DC and AC two-speed system. It is the latest generation of infinitely adjustable after the variable frequency speed control system and brushless DC motor speed control system. Speed system. The driving circuit of the prior art switch reluctance motor mainly includes a DC power source, a DC capacitor, an N-phase motor winding, an upper switching device, a lower switching device, an upper freewheeling diode, and a lower freewheeling diode. The above-mentioned DC capacitor mainly serves to buffer the rectifier circuit or the battery and stabilize the DC bus voltage. The N-phase motor winding is connected to the DC bus via a switching device and a freewheeling diode. The upper switching device and the lower freewheeling diode are connected to one end of the phase winding, and the lower switching device and the lower freewheeling diode are connected to the other end of the phase winding.

[0003] The above-mentioned switched reluctance motor drive circuit is widely used in homes and industries, but this circuit only satisfies the demand of the drive motor, and is used for increasingly frequent electric devices (such as robots, electric cars, electric weeders, etc.). It is also necessary to charge the energy storage power supply. The above-mentioned switched reluctance motor drive circuit cannot meet the needs of charging. To this end, Chinese Patent Publication No. CN201956913U discloses an integrated switched reluctance motor drive and charge conversion device, comprising an energy storage module and a drive module connected in series with the energy storage module, and a rectifier module connected to the power grid, and The driving module is connected to the control module, and is respectively connected to the energy storage module and the driving module current conversion module, and controls the rectifying operation of the rectifier module according to a preset program, and controls the rectifier module to the energy storage module. Charging, and controlling the rectifier module and the energy storage module to supply power to the outside. In this technical solution, the charging module and the driving of the switched reluctance motor are integrated to realize charging of the energy storage device. However, this technical solution is only applicable to AC power, especially to AC grid charging. According to the corresponding power factor requirements, the equipment connected to the grid should focus on the charging control and power factor control of the high voltage battery.

[0004] For an electric vehicle, the on-board charger enables the electric vehicle to take power from the plug of the electric grid to charge the battery of the electric vehicle. A general motor vehicle requires multiple motor drive systems to meet the requirements of different loads (such as tires, blades, etc.). At present, electric vehicles use dual power systems, one is a high-voltage battery that is supplied to the high-voltage drive motor, and the other is a low-voltage battery that is supplied to some low-voltage equipment in the vehicle body. Since the low-voltage battery has a low capacity, a high-voltage battery is generally used to supplement the low-voltage battery. Therefore, a device for converting high-voltage power to low-voltage power, including a DC-DC converter and a charging driving device, needs to be separately provided in the electric vehicle. And other electrical components. In this way, the line inside the electric car Roads and electrical equipment are complicated.

Summary of the invention

[0005] The technical problem to be solved by the present invention is that the prior art switch reluctance motor drive and the DC power supply low voltage battery are charged with the use of separate devices, waste equipment and space technical problems, and thus provide integrated switched reluctance motor drive and DC power supply. A transducer for charging low voltage batteries.

In order to solve the above technical problem, the present invention provides a conversion device for driving an integrated switched reluctance motor and charging a low voltage battery, comprising: a high voltage energy storage module and a driving module connected to the high voltage energy storage module, and the driving a module connected to the control module, the driving module driving the operation of the switched reluctance motor, further comprising a low voltage energy storage module and a DC-DC conversion module connected to the low voltage energy storage module, the DC-DC conversion module and the The control module is connected to the driving module, the DC-DC conversion module is configured to charge the power of the high-voltage energy storage module to the low-voltage energy storage module, and the control module controls the driving module and the DC-DC conversion The module works.

[0007] The conversion device of the present invention, the driving module includes at least two power electronic switches and at least two freewheeling diodes for receiving instruction driving of the control module; the DC-DC conversion module includes a Power electronic switch and a diode.

According to the transforming device of the present invention, the driving module includes a half bridge inverter of the switched reluctance motor and a body of the switched reluctance motor.

[0009] The conversion device according to the present invention, the DC-DC conversion module includes a rectification unit and a chopper unit connected to the rectification unit.

[0010] In the conversion device of the present invention, the rectifying unit is a rectifier and includes a diode.

[0011] The conversion device according to the present invention, the chopper unit includes a switching device, a negative electrode of a diode of the rectifying unit is connected to a collector of the switching device, and an emission set of the switching device and the low voltage A positive electrode of the low voltage battery of the energy storage module is connected, and a negative electrode of the low voltage battery is connected to a negative electrode of the high voltage battery.

[0012] In the conversion device of the present invention, the switching device is a triode or a relay. When the switching device is a relay, the negative pole of the diode of the rectifying unit is connected to one end of the relay, and the other end of the relay is connected to the low voltage battery pack. .

[0013] The conversion device according to the present invention is a single-phase integrated switched reluctance motor drive and low-voltage battery conversion device or a three-phase integrated switched reluctance motor drive and low-voltage battery conversion device.

[0014] The conversion device of the present invention, the single-phase integrated switched reluctance motor drive and the low-voltage battery conversion device, the control module is a digital controller or a microcomputer controller, and the drive module is two electric power An electronic switch and two freewheeling diodes, the power electronic switch being connected in series across the windings of the switched reluctance motor, the two freewheeling diodes respectively being connected to the winding of the switched reluctance motor and one of the power electronics Switch in parallel; the DC-DC conversion module is a A power electronic switch and a diode, the power electronic switch and the diode being connected in series.

[0015] The conversion device of the present invention, the three-phase integrated switched reluctance motor drive and the low-voltage battery conversion device, the drive module is six power electronic switches and six freewheeling diodes, each power electronic The switch and each of the freewheeling diodes are connected in series, and are arranged in parallel between the two poles of the high voltage energy storage module. In the adjacent two sets of parallel lines, the series order of the power electronic switch and the freewheeling diode is opposite; Each winding of the phase motor is taken out at a center point of the adjacent parallel line; the DC-DC conversion module is a power electronic switch and three diodes, and the diodes are connected in series with the windings, and are connected to the The collector of the power electronic switch.

[0016] The above technical solution of the present invention has the following advantages over the prior art:

(1) The integrated switch reluctance motor drive and the low voltage battery charging conversion device of the present invention, including a high voltage energy storage module, a drive module, a control module, a DC-DC conversion module, and a low voltage energy storage module, and integrated switch magnetic The function of resisting motor drive and low-voltage battery charging not only saves space of the device, but also drives power electronic devices and drive signal control circuits, realizing time-division multiplexing of devices such as large capacitors, inductors and heat sinks, and greatly reducing components. The complexity of the cost and board layout makes the hardware structure more compact. In addition, the high-efficiency intelligent battery charging is realized by the control module, and the timely replenishment of electric energy according to the state of the low-voltage battery in the low-voltage energy storage module is safe and reliable.

[0017] (2) The integrated switch reluctance motor drive and the low voltage battery charging conversion device of the present invention, the high voltage energy storage module stores a high voltage battery pack, and the low voltage energy storage module stores a low voltage battery pack, wherein the drive module includes a body of a half-bridge inverter and a switched reluctance motor of a switched reluctance motor, the DC-DC converter module comprising a rectifying unit and a chopper unit connected to the rectifying unit, the semi-bridge of the switched reluctance motor The inverter is composed of a power electronic switching device and a diode, the rectifying unit is composed of a diode, and the chopper unit is composed of a power electronic switching device. In the drive mode, the energy of the high voltage battery can be converted into mechanical energy by the drive module. In the low-voltage battery charging mode, the energy of the high-voltage battery transfers the high-voltage battery energy to the voltage battery through the drive module and the DC-DC converter. Some devices of the drive module participate in the energy conversion of the two modes simultaneously.

DRAWINGS

[0018] In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings, in which

Figure 1 is a block diagram showing the structure of a converter for driving a switched reluctance motor and charging a low voltage battery;

2 is a circuit diagram of a conversion device for driving a single-phase integrated switched reluctance motor and charging a low-voltage battery;

Figure 3 is a circuit diagram of a three-phase integrated switched reluctance motor drive and a low voltage battery charging converter.

detailed description

[0019] The present invention will be further described below in conjunction with the embodiments, but it should be noted that these embodiments are only used to say The method of the present invention is not limited to the scope of the present invention.

[0020] The invention will now be further described by way of specific examples.

[0021] Example 1 :

A conversion device for driving a switched reluctance motor and charging a low voltage battery, as shown in FIG. 1 , comprising: a high voltage energy storage module, a driving module, a control module, a DC-DC conversion module, and a low voltage energy storage module, wherein a high-voltage energy storage module is connected to the driving module, the driving module is connected to a DC-DC conversion module, the DC-DC module is connected to the low-voltage energy storage module, the control module and the driving module are The DC-DC converter modules are connected separately. The conversion device realizes multiplexing of two functions of the switched reluctance motor drive and the DC-DC converter charge.

[0022] The high-voltage energy storage module internally stores energy generated from a power grid or other power generating device, and is a large-capacity high-pressure energy storage device, and the high-voltage energy storage module is controlled by a battery management system. The low voltage energy storage module stores low voltage electrical energy inside. The DC-DC conversion module can charge the electrical energy of the high-voltage energy storage module to the electrical energy of the low-voltage energy storage module, where the high-voltage energy storage module includes a power electronic switch and a diode. The control module controls the operation of the driving module and the DC-DC conversion module according to a preset program. The driving module drives the operation of the switched reluctance motor, including a power electronic switching device and a diode, for receiving the command driving of the control unit, and the driving module part device also participates in the electric energy of the high-voltage energy storage module to the low-voltage energy storage module. Energy transformation. The DC-DC conversion module charges the power of the high-voltage energy storage module to the low-voltage energy storage module, and the controller controls the operation of the DC-DC conversion module to implement the high-voltage energy storage module to the low-voltage energy storage module Charging. The high-voltage energy storage module acts as a power source, and the controller module can read relevant information from the high-voltage energy storage module.

[0023] In this embodiment, the high-voltage energy storage module includes a high-voltage energy storage unit, and a high-voltage battery pack is stored therein; the low-voltage energy storage module includes a low-voltage energy storage unit, and a low-voltage battery pack is stored therein.

[0024] Further, the driving module includes a half bridge inverter of the switched reluctance motor and a body of the switched reluctance motor. The DC-DC converter module includes a rectifying unit and a chopper unit connected to the rectifying unit. The rectifying unit is a rectifier and includes a diode. The chopper unit includes a switching device, a negative electrode of the diode of the rectifying unit is connected to a collector of the switching device, and an emission set of the switching device is connected to a positive electrode of the low voltage battery of the low voltage energy storage module. The negative electrode of the low voltage battery is connected to the negative electrode of the high voltage battery. The switching device here may be a triode or a relay. When the switching device here is a relay, the negative pole of the diode of the rectifying unit is connected to one end of the relay, and the other end of the relay is connected with the low voltage battery pack.

[0025] The circuits of the single-phase integrated switched reluctance motor drive and low-voltage battery converter and the three-phase integrated switch reluctance motor drive and low-voltage battery converter are respectively shown below.

Example 2: The circuit of the single-phase integrated switched reluctance motor drive and the low-voltage battery converter is shown in Figure 2.

[0027] The high-voltage energy storage module includes a high-voltage battery pack, and the driving module includes power electronic switching devices (Q1 and Q2) and semiconductor diodes (D1 and D2), and the control module includes a digital processor or a microcomputer processor. The DC-DC conversion module includes a power electronic switching device (Q3) and a semiconductor diode (D3), and the low-voltage energy storage module includes a low-voltage battery pack. Each module corresponds to the device in Figure 2, respectively.

[0028] In this embodiment, in the single-phase integrated switched reluctance motor driving and low-voltage battery conversion device, the control module is a digital controller or a microcomputer controller, and the driving module is two power electronic switches. (Q 1 and Q 2 ) and two freewheeling diodes (D 1 and D 2 ), the power electronic switch being connected in series across the windings of the switched reluctance motor (ie, the first winding A), the two continued The flow diodes D 1 and D 2 are respectively connected in parallel with the winding of the switched reluctance motor and one of the power electronic switches; the DC-DC conversion module is a power electronic switch and a diode, and the power electronic switch and the The diodes are connected in series. Specifically, the anode of the high voltage battery pack is connected to the collector of the first switching device Q1, the emitter of the first switching device Q1 is connected to one end of the first winding A, and the other of the first winding A One end is connected to the collector of the second switching device Q2, and is connected to the anode of the high voltage battery through the first freewheeling diode D1, wherein the anode of the first freewheeling diode D1 and the second switching device Q2 a collector connection, a cathode of the first freewheeling diode D1 is connected to a positive pole of the high voltage battery, an emitter Q2 of the second switching device is connected to a cathode of the high voltage battery; and the second freewheeling diode D2 The positive electrode is connected to the negative electrode of the high voltage battery, and the negative electrode of the second freewheeling diode D2 is connected to the emitter of the first switching device Q1. The DC-DC conversion module includes a rectifying unit and a chopper unit connected to the rectifying unit. The rectifying unit is a rectifier, that is, a third diode D3, and the anode of the third diode D3 is connected to the collector of the second switching device Q2. The chopper unit includes at least a third switching device Q3, and a negative electrode of the third diode D3 is connected to a collector of the third switching device Q3, and an emitter of the third switching device Q3 and a positive electrode of the low voltage battery connection. The negative electrode of the low voltage battery is connected to the negative electrode of the high voltage battery. The control module controls whether the driving operation of the switched reluctance motor or the operation of the step-down DC-DC converter can be realized by controlling each switching device. When the third switching device Q3 is turned on, the opening and closing of the first switching device Q1 and the second switching device Q2 are used to control the operation of the switched reluctance motor. When the second switching device Q2 is turned on, the first switching device Q1 and the third switching device Q3 are combined to control the current of the smart charging of the battery. The above-mentioned conversion device can realize the stepless speed regulation of the motor and the intelligent charging of the battery.

Example 3:

The circuit of the three-phase integrated switched reluctance motor drive and the low-voltage battery converter is shown in Figure 3.

[0030] The high voltage energy storage module includes a high voltage battery pack, and the driving module includes a power electronic switching device (Q1-

Q6) and a semiconductor diode (D1-D6), the control module comprising a digital processor or a microcomputer processor, the DC-DC The conversion module includes a power electronic switching device (Qz) and a semiconductor diode (D7-D9), the low voltage energy storage module including a low voltage battery pack. Each module corresponds to the device in Figure 3, respectively.

[0031] A circuit diagram of a three-phase integrated switched reluctance motor drive and a low voltage battery charge conversion device. The entire system consists of a power electronic switching device and a power diode, capacitor, battery, motor, power electronic switching device driver board, and controller. The high voltage battery and capacitor are connected in parallel on the busbar.

[0032] The three power electronic switching device emitters and the negative poles of the three power diodes are respectively connected together to form a bridge arm, and both ends of the bridge arm are connected to the bus bar, and one ends of the three-phase windings are respectively connected to the centers of the bridge arms. point. The collectors of the three power electronic switching devices and the positive poles of the three power diodes are each connected together to form a bridge arm, the two ends of which are connected to the bus bar, and the other ends of the three-phase windings are respectively connected to the center points of the bridge arms. The other ends of the three-phase windings are each connected to the anode of the diode and connected to the negative pole of the diode connected to the three-phase winding to form a connection point which is connected to the collector of the switching device Qz. The power electronic switching device Qz has an emitter connected to the anode of the low voltage battery, and the cathode of the low voltage battery is connected to the anode of the high voltage battery.

[0033] The drive board and controller form a controller module that provides control signals for the power electronic switching device while also receiving signals such as current, voltage, rotor position, and temperature throughout the system. The controller module is connected to the vehicle controller using CAN communication, and the torque signal and the charging signal are obtained from the vehicle controller.

[0034] It is to be understood that the above-described embodiments are merely illustrative of the embodiments and are not intended to limit the embodiments. Other variations or variations of the various forms may be made by those skilled in the art based on the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations resulting therefrom are still within the scope of the invention.

Claims

WO 2014/026460 Claim PCT/CN2012/087909

A conversion device for driving a switched reluctance motor and charging a low voltage battery, comprising a high voltage energy storage module and a drive module connected to the high voltage energy storage module, and a control module connected to the drive module, the drive The operation of the module-driven switched reluctance motor is characterized by further comprising a low-voltage energy storage module and a DC-DC conversion module connected to the low-voltage energy storage module, the DC-DC conversion module and the control module and the The driving module is connected, the DC-DC conversion module is configured to charge the high-voltage energy storage module to the low-voltage energy storage module, and the control module controls the driving module and the DC-DC conversion module to work.

2. The conversion device according to claim 1, wherein: the driving module comprises at least two power electronic switches and at least two freewheeling diodes for receiving command driving of the control module; The DC conversion module includes a power electronic switch and a diode.

The conversion device according to claim 1 or 2, wherein the driving module comprises a half bridge inverter of the switched reluctance motor and a body of the switched reluctance motor.

The conversion device according to any one of claims 1 to 3, wherein the DC-DC conversion module includes a rectification unit and a chopper unit connected to the rectification unit.

The conversion device according to claim 4, wherein the rectifying unit is a rectifier and includes a diode.

The conversion device according to claim 4 or 5, wherein: the chopper unit comprises a switching device, and a negative electrode of a diode of the rectifying unit is connected to a collector of the switching device, the switching device The emission set is connected to the positive electrode of the low voltage battery of the low voltage energy storage module, and the negative electrode of the low voltage battery is connected to the negative electrode of the high voltage battery.

The conversion device according to claim 6, wherein the switching device is a triode or a relay. When the switching device is a relay, a negative pole of a diode of the rectifying unit is connected to one end of the relay, and the other end of the relay Connect to a low voltage battery pack.

The conversion device according to any one of claims 1 to 7, wherein: the conversion device is a single-phase integrated switched reluctance motor drive and a low-voltage battery conversion device or a three-phase integrated switch reluctance motor drive With low voltage battery converter.

The conversion device according to claim 8, wherein: the single-phase integrated switched reluctance motor drives and the low-voltage battery conversion device, wherein the control module is a digital controller or a microcomputer controller, and the driving The module is two power electronic switches and two freewheeling diodes, the power electronic switch is connected in series at two ends of the winding of the switched reluctance motor, and the two freewheeling diodes are respectively connected with the winding of the switched reluctance motor and The power electronic switch is connected in parallel; the DC-DC conversion module is a power electronic switch and a diode, and the power electronic switch and the diode are connected in series.

10. The conversion device according to claim 8, wherein: in the three-phase integrated switched reluctance motor driving and low voltage battery conversion device, the driving module is six power electronic switches and six freewheeling diodes. , every power electronics The switch and each of the freewheeling diodes are connected in series, and are arranged in parallel between the two poles of the high voltage energy storage module. In the adjacent two sets of parallel lines, the series order of the power electronic switch and the freewheeling diode is opposite; Each winding of the phase motor is taken out at a center point of the adjacent parallel line; the DC-DC conversion module is a power electronic switch and three diodes, and the diodes are connected in series with the windings, and are connected to the The collector of the power electronic switch.