阅读说明：本技术 功率模块的控制方法、装置、设备及功率设备 (Control method, device and equipment of power module and power equipment ) 是由 张威 王云 任广辉 薛静 郑鲲鲲 於挺 卢苗 汪知明 于 2020-06-22 设计创作，主要内容包括：本发明涉及一种功率模块的控制方法、功率模块的控制装置、功率模块的控制设备及功率设备。一种功率模块的控制方法,用于利用驱动模块驱动功率模块对电机进行控制；驱动模块至少包括上桥驱动单元及下桥驱动单元,功率模块至少包括上桥功率单元和与下桥功率单元；电机的绕组连接于上桥功率单元和下桥功率单元之间；控制方法包括获取电机的绕组的电流；在绕组的电流为正电流时,向上桥驱动单元输出控制波以控制上桥驱动单元工作,且关断下桥驱动单元；在绕组的电流为负电流时,向下桥驱动单元输出控制波以控制下桥驱动单元工作,且关断上桥驱动单元。上述控制方法,降低了驱动模块的功耗,从而有利于降低驱动电源的功耗。(The invention relates to a control method and a control device of a power module, control equipment of the power module and power equipment. A control method of a power module is used for controlling a motor by driving the power module through a driving module; the driving module at least comprises an upper bridge driving unit and a lower bridge driving unit, and the power module at least comprises an upper bridge power unit and a lower bridge power unit; the winding of the motor is connected between the upper bridge power unit and the lower bridge power unit; the control method comprises the steps of obtaining current of a winding of the motor; when the current of the winding is positive current, outputting a control wave to the upper bridge driving unit to control the upper bridge driving unit to work, and switching off the lower bridge driving unit; and when the current of the winding is negative current, outputting a control wave to the lower bridge driving unit to control the lower bridge driving unit to work, and switching off the upper bridge driving unit. The control method reduces the power consumption of the driving module, thereby being beneficial to reducing the power consumption of the driving power supply.)

1. A control method of a power module is used for controlling a motor by driving the power module through a driving module; the driving module at least comprises an upper bridge driving unit and a lower bridge driving unit connected with the upper bridge driving unit, and the power module at least comprises an upper bridge power unit connected with the upper bridge driving unit and a lower bridge power unit connected with the lower bridge driving unit; the winding of the motor is connected between the upper bridge power unit and the lower bridge power unit; the control method of the power module is characterized by comprising the following steps:

acquiring current of a winding of the motor;

when the current of the winding is a positive current, outputting a control wave to the upper bridge driving unit to control the upper bridge driving unit to work, and turning off the lower bridge driving unit;

and when the current of the winding is negative current, outputting a control wave to the lower bridge driving unit to control the lower bridge driving unit to work, and switching off the upper bridge driving unit.

2. The power module control method of claim 1, wherein the turning off the under drive unit comprises: inputting a negative voltage to the lower bridge driving unit; and/or said switching off said upper axle drive unit comprises: inputting a negative voltage to the upper bridge driving unit.

3. The method of controlling a power module according to claim 1, further comprising:

acquiring a hysteresis window; the hysteresis window is a current interval of the winding and comprises an instantaneous value of which the current is zero;

when the current of the winding is in the hysteresis window, continuously outputting a control wave to the upper bridge driving unit; and/or continuously outputting the control wave to the lower bridge driving unit.

4. The method of claim 1, wherein the control wave comprises a PWM wave.

5. A control device of a power module is used for controlling a motor by driving the power module through a driving module; the driving module at least comprises an upper bridge driving unit and a lower bridge driving unit connected with the upper bridge driving unit, and the power module at least comprises an upper bridge power unit connected with the upper bridge driving unit and a lower bridge power unit connected with the lower bridge driving unit; the winding of the motor is connected between the upper bridge power unit and the lower bridge power unit; characterized in that the control device of the power module comprises:

the acquisition module is used for acquiring the current of the winding of the motor;

the judging module is used for judging whether the current of the winding is a positive current or a negative current;

the control module is used for outputting a control wave to the upper bridge driving unit to control the upper bridge driving unit to work and switching off the lower bridge driving unit when the current of the winding is a positive current; and when the current of the winding is negative current, outputting a control wave to the lower bridge driving unit to control the lower bridge driving unit to work and switching off the upper bridge driving unit.

6. A control device of a power module is used for driving the power module to control a motor, the power module comprises an upper bridge power unit and a lower bridge power unit, and the motor is connected between the upper bridge power unit and the lower bridge power unit; it is characterized by comprising:

an upper bridge isolation unit;

a lower bridge isolation unit;

the upper bridge driving unit is connected with the upper bridge isolation unit and is used for being connected with the upper bridge power unit so as to control the power device in the upper bridge power unit to be switched on or switched off;

the lower bridge driving unit is connected with the lower bridge isolation unit and is used for being connected with the lower bridge power unit so as to control the power device in the lower bridge power unit to be switched on or switched off;

the power supply unit is connected with the upper bridge isolation unit, the lower bridge isolation unit, the upper bridge driving unit and the lower bridge driving unit and is used for outputting turn-off voltage and upper bridge driving voltage to the upper bridge isolation unit, turn-off voltage and lower bridge driving voltage to the lower bridge isolation unit, upper bridge driving voltage to the upper bridge driving unit and lower bridge driving voltage to the lower bridge driving unit; the turn-off voltage is a negative voltage, and the upper bridge driving voltage are positive voltages;

and the control unit is used for acquiring the current of the winding of the motor, outputting a control wave to the upper bridge isolation unit to control the upper bridge driving unit to work and stopping outputting the control wave to the lower bridge isolation unit when the current of the winding is a positive current, and outputting the control wave to the lower bridge isolation unit to control the lower bridge driving unit to work and stopping outputting the control wave to the upper bridge isolation unit when the current of the winding is a negative current.

7. The control device of a power module according to claim 6, wherein the control unit continues to output a control wave to the upper bridge isolation unit when the current of the winding is within the hysteresis window; and/or continuously outputting a control wave to the lower bridge isolation unit;

wherein the hysteresis window is a current interval of the winding, and the hysteresis window includes an instantaneous value at which the current is zero.

8. The control device of a power module according to claim 6, wherein the control wave comprises a PWM wave.

9. The control device of claim 6, wherein the upper bridge driving unit comprises a first transistor and a second transistor; the collector of the first triode is connected with the power supply unit, the collector of the second triode is connected with the upper bridge isolation unit, the base of the first triode and the base of the second triode are both connected with the upper bridge isolation unit, and the emitter of the first triode and the emitter of the second triode are both connected with the upper bridge power unit;

the lower axle driving unit comprises a third triode and a fourth triode; a collector of the third triode is connected with the power supply unit, a collector of the fourth triode is connected with a ground terminal, a base of the third triode and a base of the fourth diode are both connected with the lower bridge isolation unit, and an emitter of the third triode and an emitter of the fourth triode are both connected with the lower bridge power unit;

the first triode and the third triode are NPN type triodes, and the second triode and the fourth triode are PNP triodes.

10. A power device, comprising a power module control device according to any one of claims 6 to 9, and a power module, wherein the power module includes at least an upper bridge power unit and a lower bridge power unit, the upper bridge power unit and the lower bridge power unit are connected, and a motor is connected between the upper bridge power unit and the lower bridge power unit, and the power module control device is connected to the power module, and is configured to change a current direction of a winding of the motor by controlling the operation of the upper bridge power unit or the operation of the lower bridge power unit.

Technical Field

The present invention relates to the field of power electronics technologies, and in particular, to a method and an apparatus for controlling a power module, a device for controlling a power module, and a power device.

Background

At present, the power switch device has wide application in the power electronic field of new energy automobiles, industrial frequency converters and the like. For example, power switching devices are used as the primary power conversion devices in motor control.

However, when the motor is controlled by using the power switching device, the driving power supply needs to have a large volume due to large power consumption for driving the power switching device in the conventional technology, and the heat dissipation performance is required to be higher.

Disclosure of Invention

In view of the above, it is necessary to provide a control method of a power module, a control device of the power module, and a power device, in order to solve the problems that the driving power supply needs to have a large volume due to the large power consumption for driving the power switching device and has a higher requirement for heat dissipation performance in the conventional technology.

A control method of a power module is used for controlling a motor by driving the power module through a driving module; the driving module at least comprises an upper bridge driving unit and a lower bridge driving unit connected with the upper bridge driving unit, and the power module at least comprises an upper bridge power unit connected with the upper bridge driving unit and a lower bridge power unit connected with the lower bridge driving unit; the winding of the motor is connected between the upper bridge power unit and the lower bridge power unit; the control method of the power module comprises the following steps:

acquiring current of a winding of the motor;

when the current of the winding is a positive current, outputting a control wave to the upper bridge driving unit to control the upper bridge driving unit to work, and turning off the lower bridge driving unit;

and when the current of the winding is negative current, outputting a control wave to the lower bridge driving unit to control the lower bridge driving unit to work, and switching off the upper bridge driving unit.

According to the control method, when the current of the winding is positive current, the upper bridge driving unit outputs the control wave to control the upper bridge driving unit to work and switch off the lower bridge driving unit, and when the current of the winding is negative current, the lower bridge driving unit outputs the control wave to control the lower bridge driving unit to work and switch off the upper bridge driving unit. Therefore, when the current of the winding is a positive current or a negative current, only one of the upper bridge driving unit and the lower bridge driving unit in the same group of driving units works, and the other one is in an off state, so that the power consumption of the driving module is reduced, and the reduction of the power consumption of the driving power supply, the reduction of the whole volume of the driving power supply and the reduction of the heat loss are facilitated.

In one embodiment, the turning off the under drive unit includes: inputting a negative voltage to the lower bridge driving unit; and/or said switching off said upper axle drive unit comprises: inputting a negative voltage to the upper bridge driving unit.

In one embodiment, the control method of the power module further includes:

acquiring a hysteresis window; the hysteresis window is a current interval of the winding and comprises an instantaneous value of which the current is zero;

when the current of the winding is in the hysteresis window, continuously outputting a control wave to the upper bridge driving unit; and/or continuously outputting the control wave to the lower bridge driving unit.

In one embodiment, the control wave comprises a PWM wave.

A control device of a power module is used for controlling a motor by driving the power module through a driving module; the driving module at least comprises an upper bridge driving unit and a lower bridge driving unit connected with the upper bridge driving unit, and the power module at least comprises an upper bridge power unit connected with the upper bridge driving unit and a lower bridge power unit connected with the lower bridge driving unit; the winding of the motor is connected between the upper bridge power unit and the lower bridge power unit; the control device of the power module comprises:

the acquisition module is used for acquiring the current of the winding of the motor;

the judging module is used for judging whether the current of the winding is a positive current or a negative current;

the control module is used for outputting a control wave to the upper bridge driving unit to control the upper bridge driving unit to work and switching off the lower bridge driving unit when the current of the winding is a positive current; and when the current of the winding is negative current, outputting a control wave to the lower bridge driving unit to control the lower bridge driving unit to work and switching off the upper bridge driving unit.

A control device of a power module is used for driving the power module to control a motor, the power module comprises an upper bridge power unit and a lower bridge power unit, and the motor is connected between the upper bridge power unit and the lower bridge power unit; the method comprises the following steps:

an upper bridge isolation unit;

a lower bridge isolation unit;

the upper bridge driving unit is connected with the upper bridge isolation unit and is used for being connected with the upper bridge power unit so as to control the power device in the upper bridge power unit to be switched on or switched off;

the lower bridge driving unit is connected with the lower bridge isolation unit and is used for being connected with the lower bridge power unit so as to control the power device in the lower bridge power unit to be switched on or switched off;

the power supply unit is connected with the upper bridge isolation unit, the lower bridge isolation unit, the upper bridge driving unit and the lower bridge driving unit and is used for outputting turn-off voltage and upper bridge driving voltage to the upper bridge isolation unit, turn-off voltage and lower bridge driving voltage to the lower bridge isolation unit, upper bridge driving voltage to the upper bridge driving unit and lower bridge driving voltage to the lower bridge driving unit; the turn-off voltage is a negative voltage, and the upper bridge driving voltage are positive voltages;

and the control unit is used for acquiring the current of the winding of the motor, outputting a control wave to the upper bridge isolation unit to control the upper bridge driving unit to work and stopping outputting the control wave to the lower bridge isolation unit when the current of the winding is a positive current, and outputting the control wave to the lower bridge isolation unit to control the lower bridge driving unit to work and stopping outputting the control wave to the upper bridge isolation unit when the current of the winding is a negative current.

In one embodiment, the control unit continuously outputs a control wave to the upper bridge isolation unit when the current of the winding is in the hysteresis window; and/or continuously outputting a control wave to the lower bridge isolation unit;

wherein the hysteresis window is a current interval of the winding, and the hysteresis window includes an instantaneous value at which the current is zero.

In one embodiment, the control wave comprises a PWM wave.

In one embodiment, the upper bridge driving unit comprises a first triode and a second triode; the collector of the first triode is connected with the power supply unit, the collector of the second triode is connected with the upper bridge isolation unit, the base of the first triode and the base of the second triode are both connected with the upper bridge isolation unit, and the emitter of the first triode and the emitter of the second triode are both connected with the upper bridge power unit;

the lower axle driving unit comprises a third triode and a fourth triode; a collector of the third triode is connected with the power supply unit, a collector of the fourth triode is connected with a ground terminal, a base of the third triode and a base of the fourth diode are both connected with the lower bridge isolation unit, and an emitter of the third triode and an emitter of the fourth triode are both connected with the lower bridge power unit;

the first triode and the third triode are NPN type triodes, and the second triode and the fourth triode are PNP triodes.

A power device comprises a control device of a power module and the power module, wherein the power module at least comprises an upper bridge power unit and a lower bridge power unit, the upper bridge power unit is connected with the lower bridge power unit, a motor is connected between the upper bridge power unit and the lower bridge power unit, the control device of the power module is connected with the power module, and the control device controls the upper bridge power unit to work or controls the lower bridge power unit to work so as to change the current direction of a winding of the motor.

Drawings

Fig. 1 is a flowchart of a method for controlling a power module according to an embodiment.

Fig. 2 is a timing diagram of the switching of the control power module in an embodiment.

Fig. 3 is a flowchart illustrating steps included in a method for controlling a power module according to an embodiment.

Fig. 4 is a circuit diagram of a power device in an embodiment.

Fig. 5 is a block diagram of a control device of a power module in an embodiment.

Description of reference numerals:

410. a control device; 420. a power module; 411. an upper bridge isolation unit; 412. a lower bridge isolation unit; 413. an upper axle drive unit; 414. a lower axle drive unit; 415. a power supply unit; 416. a control unit; 421. an upper bridge power unit; 422. a lower bridge power unit; 4161. a current sensor; 430. a winding; 500. A control device for the power module; 510. an acquisition unit; 520. a judgment unit; 530. a control unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" and "outer" etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. Further, when an element is referred to as being "formed on" another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.

The present application provides a method for controlling a power module, which is used for controlling a motor by using a driving module to drive the power module, and specifically, may be controlling the operation of power devices such as Insulated Gate Bipolar Transistors (IGBTs) and silicon carbide (SIC) in the power module by using the driving module, so as to control the operation of the motor. The driving module at least comprises an upper bridge driving unit and a lower bridge driving unit connected with the upper bridge driving unit. The power module at least comprises an upper bridge power unit connected with the upper bridge driving unit and a lower bridge power unit connected with the lower bridge driving unit. The windings of the motor are connected between the upper bridge power unit and the lower bridge power unit. The upper bridge driving units and the lower bridge driving units in the driving module are the same in number and correspond to each other one by one, and the number of the upper bridge driving units and the number of the lower bridge driving units can be set as required. For example, when the motor is a three-phase motor, the driving module may include three groups of driving units, the corresponding power module also includes three groups of power units, each group of driving units is provided with an upper bridge driving unit and a lower bridge driving unit, each group of power units is provided with an upper bridge power unit and a lower bridge power unit, each upper bridge driving unit correspondingly controls the operation of one upper bridge power unit, and each lower bridge driving unit correspondingly controls the operation of one lower bridge power unit. Each group of power units is respectively connected with one winding of the three-phase motor, and the control method of the power module (hereinafter referred to as the control method) inputs control waves to the driving module so as to switch on or off the corresponding power unit in the driving module, thereby controlling the operation of the motor.

FIG. 1 is a flow chart of a control method according to an embodiment. As shown in fig. 1, the control method includes the steps of:

step S110, a current of a winding of the motor is acquired.

Specifically, when the driving module includes a plurality of groups of driving units, the obtained current of the winding of the motor is the current output from the power unit corresponding to the driving unit to the winding of the motor. For example, when a power cell corresponding to a group of drive units is connected to an a-phase winding of the motor and a control wave is output from the drive unit of the group, it is necessary to use the current of the a-phase winding as a criterion, similarly, the control wave output from the drive unit corresponding to the power cell connected to the B-phase winding is also the current of the B-phase winding as a criterion, and similarly, the control wave output from the drive unit corresponding to the power cell connected to the C-phase winding is also the current of the C-phase winding as a criterion.

For example, a current sensor may be disposed on a wiring of a winding of the motor, the current sensor may be disposed at a central point of the upper bridge power unit and the lower bridge power unit in each group of power units, and a current of the winding may be collected by the current sensor, so as to obtain information on a direction and a magnitude of the current of the winding.

Illustratively, software algorithms such as current waveform reconstruction are adopted to obtain information of the direction and the magnitude of the current of the winding.

Of course, the current of the winding may be obtained by any conventional method, and is not limited to the above-mentioned method.

Step S120, determining whether the current of the winding is a positive current or a negative current. If the current of the winding is positive, step S131 is executed, and if the current of the winding is negative, step S132 is executed.

Step S131, the upper bridge driving unit outputs a control wave to control the upper bridge driving unit to operate, and the lower bridge driving unit is turned off.

Step S132, outputting a control wave to the lower bridge driving unit to control the lower bridge driving unit to work, and turning off the upper bridge driving unit.

Specifically, it is possible to determine whether the current of the winding is a positive current or a negative current by a method such as a hysteresis control method. The control wave output to the upper bridge driving unit and the control wave output to the lower bridge driving unit may be PWM waves, and the amplitudes of the PWM waves output to the upper bridge driving unit and the PWM waves output to the lower bridge driving unit may be the same or different. The operation of the motor can be controlled by adjusting the duty cycle and the period of the PWM wave, for example, adjusting the duty cycle of the PWM wave to change the rotational speed of the motor.

Referring to fig. 2, when the current of the winding is determined to be a positive current, a PWM wave is output to the upper bridge driving unit, so that the power devices in the upper bridge power unit are controlled to be turned on, and the current flows from the upper bridge power unit to the winding of the motor. In this embodiment, when the current of the winding is determined to be a positive current, the lower bridge driving unit is also turned off. For example, stopping the output of the PWM wave to the under drive unit causes the under drive unit to be turned off, and may further input a negative voltage to the under drive unit, causing the under drive unit to be turned off at the negative voltage.

And when the current of the winding is judged to be negative current, PWM waves are output to the lower bridge driving unit, so that a power device in the lower bridge power unit is controlled to be conducted, and the current flows to the lower bridge driving unit from the winding of the motor. In this embodiment, when the current of the winding is determined to be a negative current, the upper bridge driving unit is also turned off. For example, stopping the output of the PWM wave to the upper bridge driving unit causes the upper bridge driving unit to be turned off, and it is also possible to further input a negative voltage to the upper bridge driving unit, causing the upper bridge driving unit to be turned off at the negative voltage.

According to the control method, when the current of the winding is positive current, the upper bridge driving unit outputs the control wave to control the upper bridge driving unit to work and switch off the lower bridge driving unit, and when the current of the winding is negative current, the lower bridge driving unit outputs the control wave to control the lower bridge driving unit to work and switch off the upper bridge driving unit. Therefore, when the current of the winding is a positive current or a negative current, only one of the upper bridge driving unit and the lower bridge driving unit in the same group of driving units works, and the other one is in an off state, so that the power consumption of the driving module is reduced, and the reduction of the power consumption of the driving power supply, the reduction of the whole volume of the driving power supply and the reduction of the heat loss are facilitated.

In an embodiment, referring to fig. 3, the control method further includes the steps of:

in step S140, a hysteresis window is obtained.

Step S150, determine whether the current of the winding is within the hysteresis window. If yes, at least one of step S161 and step S162 is executed.

In step S161, the control wave continues to be output to the upper bridge driving unit.

Step S162 continues to output the control wave to the lower bridge driving unit.

Specifically, the hysteresis window is a current interval of the winding, the width of the current interval can be adjusted according to actual requirements, and the hysteresis window contains an instantaneous value of zero current, that is, the hysteresis window is arranged near the instantaneous value of zero current of the winding. When the current of the winding is in the hysteresis window, only one of the steps S161 and S162 may be executed, or may be executed simultaneously, so that when the current of the winding is zero, a control waveform is output to at least one of the upper bridge driving unit and the lower bridge driving unit, thereby avoiding erroneous switching of a power device in the power unit, and facilitating improvement of stability of the control process.

The application also provides a control device (hereinafter referred to as a control device) of the power module and a power device comprising the control device. Fig. 4 is a circuit diagram of a power device in an embodiment. As shown in fig. 4, the control device 410 is used for driving a power module 420 to control the motor, the power module 420 includes an upper bridge power unit 421 and a lower bridge power unit 422, and a winding 430 of the motor is connected between the upper bridge power unit 421 and the lower bridge power unit 422. The control device 410 includes an upper bridge isolation unit 411, a lower bridge isolation unit 412, an upper bridge driving unit 413, a lower bridge driving unit 414, a power supply unit 415, and a control unit 416. The upper bridge driving unit 413 is connected to the upper bridge isolation unit 411, and the upper bridge driving unit 413 is configured to be connected to the upper bridge power unit 421 to control a power device in the upper bridge power unit 421 to turn on or off. The lower bridge driving unit 414 is connected to the lower bridge isolation unit 412, and the lower bridge driving unit 414 is configured to be connected to the lower bridge power unit 422 to control power devices in the lower bridge power unit 422 to turn on or off. The power supply unit 415 is connected to the upper bridge isolation unit 411, the lower bridge isolation unit 412, the upper bridge driving unit 413, and the lower bridge driving unit 414, and the power supply unit 415 is configured to output a turn-off voltage and an upper bridge driving voltage to the upper bridge isolation unit 411, output a turn-off voltage and a lower bridge driving voltage to the lower bridge isolation unit 412, output an upper bridge driving voltage to the upper bridge driving unit 413, and output an upper bridge driving voltage to the lower bridge driving unit 414; the off voltage is a negative voltage, and the upper bridge driving voltage are positive voltages. The control unit 416 is connected to the upper bridge isolation unit 411 and the lower bridge isolation unit 412, the control unit 416 is configured to obtain a current of the winding, output a control wave to the upper bridge isolation unit 411 to control the upper bridge driving unit 413 to operate and stop outputting the control wave to the lower bridge isolation unit 412 when the current of the winding is a positive current, and output a control wave to the lower bridge isolation unit 412 to control the lower bridge driving unit 414 to operate and stop outputting the control wave to the upper bridge isolation unit 411 when the current of the winding 430 is a negative current.

The power device includes a control device 410 and a power module 420. The power module 420 at least includes an upper bridge power unit 421 and a lower bridge power unit 422, the upper bridge power unit 421 and the lower bridge power unit 422 are connected and the motor is connected between the upper bridge power unit 421 and the lower bridge power unit 422, the control device 410 of the power module 420 is connected with the power module 420, and the current direction of the winding 430 of the motor is changed by controlling the operation of the upper bridge power unit 421 or controlling the operation of the lower bridge power unit 422.

Illustratively, the power supply unit 415 includes a power supply and a transformer, wherein a primary side of the transformer is connected to the power supply, the power supply inputs an initial voltage V _ P to the primary side of the transformer, the transformer converts the initial voltage V _ P, and a secondary side of the transformer can output a turn-off voltage V _ E, an upper bridge driving voltage V _ H, and a lower bridge driving voltage V _ L. The turn-off voltage V _ E is a negative voltage, and the upper bridge driving voltage V _ H and the lower bridge driving voltage V _ L are both positive voltages.

Illustratively, the upper bridge driving unit 413 includes a first transistor Q1 and a second transistor Q2. A collector of the first transistor Q1 is connected to the power supply unit 415 to input the upper bridge driving voltage V _ H to the collector of the first transistor Q1, a collector of the second transistor Q2 is connected to the upper bridge isolation unit 411, a base of the first transistor Q1 and a base of the second transistor Q2 are both connected to the upper bridge isolation unit 411, and an emitter of the first transistor Q1 and an emitter of the second transistor Q2 are both connected to the upper bridge power unit 421.

The lower bridge driving unit 414 includes a third transistor Q3 and a fourth transistor Q4. A collector of the third transistor Q3 is connected to the power supply unit 415 to input the drop bridge driving voltage V _ L to the collector of the third transistor Q3, a collector of the fourth transistor Q4 is connected to a ground terminal, a base of the third transistor Q3 and a base of the fourth diode Q4 are both connected to the drop bridge isolation unit 412, and an emitter of the third transistor Q3 and an emitter of the fourth transistor Q4 are both connected to the drop bridge power unit 422.

The first transistor Q3 and the third transistor Q3 are NPN transistors, and the second transistor Q2 and the fourth transistor Q4 are PNP transistors.

For example, the upper bridge isolation unit 411 and the lower bridge isolation unit 412 may each include an optical coupling isolation chip, so that isolation between the driving units can be achieved, mutual interference is avoided, and safety performance of the control device 410 is improved.

Illustratively, the control unit 416 may include a current sensor 4161 and a controller (not shown in the figures). For example, the controller may be a single chip, a DSP, an FPGA, or the like. The current sensor 4161 may be disposed at the center point of the upper bridge power unit 421 and the lower bridge power unit 422 in each group of power units, and the current of the winding 430 may be collected by the current sensor 4161, so as to obtain information on the direction and magnitude of the current of the winding 430. In other embodiments, software algorithms such as current waveform reconstruction may be used to obtain information about the direction and magnitude of the current in the winding 430. The current of winding 430 may be obtained in any manner known in the art and is not limited to the manner set forth above.

After acquiring the current of the winding 430, the controller determines whether the current of the winding 430 is a positive current or a negative current, and outputs a control sequence according to the determination result. Specifically, when the current of winding 430 is a positive current, the controller outputs the control wave to upper bridge isolation unit 411 to control upper bridge driving unit 413 to operate, and stops outputting the control wave to lower bridge isolation unit 412 to stop lower bridge driving unit 414 from operating. Optionally, the controller outputs the PWM wave PWM _ H to the upper bridge isolation unit 411. When the current of winding 430 is negative, the controller outputs the control wave to lower bridge isolation unit 412 to control lower bridge driving unit 414 to operate, and stops outputting the control wave to upper bridge isolation unit 411 to stop operating upper bridge driving unit 413. Alternatively, the controller outputs the PWM wave PWM _ L to the lower bridge isolation unit 412.

After the controller outputs the PWM wave PWM _ H to the upper bridge isolation unit 411, since the power supply unit 415 is connected to the upper bridge driving unit 413 and the upper bridge isolation unit 411 to output the upper bridge driving voltage V _ H to the upper bridge driving unit 413 and the upper bridge isolation unit 411, so that the driving voltage is amplified, the amplitude of the PWM wave output to the upper bridge driving unit 413 is equal to the upper bridge driving voltage V _ H, the upper bridge driving unit 413 is turned on, thereby controlling the power devices in the upper bridge power unit 421 connected to the upper bridge driving unit 413 to be turned on, and the current flows from the upper bridge power unit 421 to the winding 430 of the motor, that is, the current is a positive current.

After the controller stops outputting the PWM wave PWM _ H to the upper bridge isolation unit 411, since the power supply unit 415 is connected to the upper bridge isolation unit 411 to output the off-voltage V _ E to the upper bridge isolation unit 411, the upper bridge driving unit 413 is turned off by the negative voltage.

After the controller outputs the PWM wave PWM _ L to the lower bridge isolation unit 412, since the power supply unit 415 is connected to the lower bridge driving unit 414 and the lower bridge isolation unit 412 to output the lower bridge driving voltage V _ L to the lower bridge driving unit 414 and the lower bridge isolation unit 412, so that the driving voltage is amplified, the amplitude of the PWM wave output to the lower bridge driving unit 414 is equal to the lower bridge driving voltage V _ L, the lower bridge driving unit 414 is turned on, thereby controlling the power devices in the lower bridge power unit 422 connected to the lower bridge driving unit 414 to be turned on, and the current flows into the lower bridge power unit 422 from the winding 430 of the motor, that is, the current is a negative current.

After the controller stops outputting the PWM wave PWM _ L to the lower bridge isolation unit 412, since the power supply unit 415 is connected to the lower bridge isolation unit 412 to output the off-voltage V _ E to the lower bridge isolation unit 412, the lower bridge driving unit 414 is turned off by the negative voltage.

Optionally, the upper bridge power unit 421 may include an IGBT and a diode, an anode of the diode in the upper bridge power unit 421 is connected to an emitter of the IGBT, a cathode of the diode is connected to a collector of the IGBT, and a gate of the IGBT is connected between the first transistor Q1 and the second transistor Q2. The lower bridge power unit 422 may also include an IGBT and a diode, an anode of the diode in the lower bridge power unit 422 is connected to an emitter of the IGBT, a cathode of the diode is connected to a collector of the IGBT, and a gate of the IGBT is connected between the third transistor Q3 and the fourth transistor Q4. The emitters of the IGBTs in the upper bridge power cell 421 are connected to the collectors of the IGBTs in the lower bridge power cell and to the windings 430 of the motor. When the control wave output to the upper bridge driving unit 413 and the control wave output to the lower bridge driving unit 414 are stopped, the IGBT in the upper bridge power unit 421 is turned on, the IGBT in the lower bridge power unit 422 is turned off, current flows from the upper bridge power unit 421 to the winding 430 of the motor, and the diode in the lower bridge power unit 422 plays a role of follow current. When the control wave output to the lower bridge driving unit 414 and the control wave output to the upper bridge driving unit 413 are stopped, the IGBT in the lower bridge power unit 422 is turned on, the IGBT in the upper bridge power unit 421 is turned off, the current flows from the winding 430 of the motor to the lower bridge power unit 422, and the diode in the upper bridge power unit 421 plays a role of freewheeling.

The above-described control apparatus 410, when the current of the winding 430 is a positive current, outputs a control wave to the upper bridge driving unit 413 to control the upper bridge driving unit 413 to operate and turn off the lower bridge driving unit 414, and, when the current of the winding is a negative current, outputs a control wave to the lower bridge driving unit 414 to control the lower bridge driving unit 414 to operate and turn off the upper bridge driving unit 413. Thus, when the current of the winding 430 is a positive current or a negative current, only one of the upper bridge driving unit 413 and the lower bridge driving unit 414 in the same group of driving units operates, and the other one is in an off state, so that the driving power consumption is reduced, the power consumption of the power supply unit 415 is reduced, the size of the transformer can be reduced, the heat generation is reduced, and the performance of the control device 410 is improved. Also, when a battery is used as a power source in the power supply unit 415, the use time of the battery can be extended due to the reduction of power consumption of the power supply unit 415. In addition, compared with the way of driving the power module by the integrated driving module, the control device 410 can be applied to various types of power devices, and has a wider application range.

In one embodiment, the control unit 416 continuously outputs the control wave to the upper bridge isolation unit 411 when the current of the winding is within the hysteresis window. In another embodiment, the control unit 416 continuously outputs the control wave to the upper bridge isolation unit 411 when the current of the winding is within the hysteresis window. The hysteresis window is a current interval of the winding, and includes an instantaneous value of zero current.

The application also provides a control device of the power module. And the control device of the power module is used for controlling the motor by driving the power module through the driving module. The driving module at least comprises an upper bridge driving unit and a lower bridge driving unit connected with the upper bridge driving unit, and the power module at least comprises an upper bridge power unit connected with the upper bridge driving unit and a lower bridge power unit connected with the lower bridge driving unit; the windings of the motor are connected between the upper bridge power unit and the lower bridge power unit. As shown in fig. 5, the control device 500 of the power module includes an obtaining module 510, a determining module 520, and a control module 530. The obtaining module 510 is used for obtaining the current of the winding of the motor. The determining module 520 is used for determining whether the current of the winding is a positive current or a negative current. The control module 530 is configured to output a control wave to the upper bridge driving unit to control the upper bridge driving unit to operate and turn off the lower bridge driving unit when the current of the winding is a positive current; and when the current of the winding is negative current, the lower bridge driving unit outputs control waves to control the lower bridge driving unit to work, and the upper bridge driving unit is switched off. Optionally, the control wave comprises a PWM wave.

The control device 500 of the power module outputs a control wave to the upper bridge driving unit to control the upper bridge driving unit to operate and turn off the lower bridge driving unit when the current of the winding is a positive current, and outputs a control wave to the lower bridge driving unit to control the lower bridge driving unit to operate and turn off the upper bridge driving unit when the current of the winding is a negative current. Therefore, when the current of the winding is a positive current or a negative current, only one of the upper bridge driving unit and the lower bridge driving unit in the same group of driving units works, and the other one is in an off state, so that the driving power consumption is reduced, and the reduction of the power consumption of the driving power supply, the reduction of the whole volume of the driving power supply and the reduction of the heat loss are facilitated.

In one embodiment, the control module 530 includes inputting a negative voltage to the under drive unit when performing the step of turning off the under drive unit. In another embodiment, the control module 530 includes inputting a negative voltage to the upper bridge driving unit when performing the step of turning off the upper bridge driving unit.

In an embodiment, the control device 500 of the power module further includes a hysteresis window obtaining module. The hysteresis window acquisition module is used for acquiring a hysteresis window. The hysteresis window is the current interval of the winding and contains the instantaneous value of the current being zero. The control unit 530 is further configured to continuously output a control wave to the upper bridge driving unit to control the operation of the upper bridge power unit when the current of the winding is within the hysteresis window. In another embodiment, the control unit 530 is further configured to continuously output the control wave to the lower bridge driving unit to control the lower bridge power unit to operate when the current of the winding is within the hysteresis window.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.