CN113922730A - Method and system for modulating duty ratio of switching tube - Google Patents

Method and system for modulating duty ratio of switching tube Download PDF

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Publication number
CN113922730A
CN113922730A CN202111181888.XA CN202111181888A CN113922730A CN 113922730 A CN113922730 A CN 113922730A CN 202111181888 A CN202111181888 A CN 202111181888A CN 113922730 A CN113922730 A CN 113922730A
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phase
time
switching
turn
pwm wave
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CN113922730B (en
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韩娜
沈捷
朱骏
周潇
王海鑫
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Leadrive Technology Shanghai Co Ltd
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Leadrive Technology Shanghai Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a method and a system for modulating the duty ratio of a switching tube, wherein the modulation method comprises the following steps: acquiring PWM wave-emitting forms of switching tubes of the three-phase inverter on a U phase, a V phase and a W phase, wherein the PWM wave-emitting forms comprise n switching cycles and the turn-on time and the turn-off time in each switching cycle; modulating the PWM wave-emitting forms of the switching tubes on any two phases of the U phase, the V phase and the W phase to enable the rising edge of the switching tube on each phase at the turn-on time and the falling edge of the switching tube on each phase at the turn-off time to be separated from the rising edge of the switching tube on the other phase at the turn-on time and the falling edge of the switching tube on the other phase at the turn-off time; when the motor vehicle with the three-phase inverter stops parking, the PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase are modulated to the original state. After the technical scheme is adopted, the requirement on the common-mode voltage rejection ratio of the driving chip can be reduced, and the type selection of the driving chip is simplified.

Description

Method and system for modulating duty ratio of switching tube
Technical Field
The invention relates to the field of motor control, in particular to a method and a system for modulating duty ratio of a switching tube.
Background
With the rapid development of new energy automobiles, more and more users select new energy automobiles as seat drivers, and therefore more and more requirements are put forward on the new energy automobiles by the users. When the new energy automobile is parked, due to the regular work of the motor controller, the duty ratios of the plurality of switching tubes of the upper bridge arm or the lower bridge arm are controlled to be the same, and the control modes of the switching tubes are also completely the same, so that a common-mode voltage during parking is introduced, and the common-mode voltage causes various problems, such as reduction of system robustness, increase of noise and the like, and brings bad use experience to users.
Therefore, a novel method and a novel system for modulating the duty ratio of the switching tube are needed, so that the requirement of an electric control system on the parasitic inductance of the board card during grounding can be effectively reduced, and the design of the board card is simplified.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a method and a system for modulating the duty ratio of a switching tube, so that the requirement on the common-mode voltage rejection ratio of a driving chip is reduced, and the type selection of the driving chip is simplified.
The invention discloses a method for modulating the duty ratio of a switching tube, which comprises the following steps:
when a motor vehicle with a three-phase inverter is parked, acquiring PWM wave-emitting forms of switching tubes of the three-phase inverter on a U phase, a V phase and a W phase, wherein the PWM wave-emitting forms comprise n switching cycles and the turn-on time and the turn-off time in each switching cycle;
when the PWM wave-emitting forms of the switching tubes on the U-phase, the V-phase and the W-phase are centrosymmetric and the PWM wave-emitting forms on different phases are consistent, the PWM wave-emitting forms of the switching tubes on any two phases of the U-phase, the V-phase and the W-phase are modulated, so that a rising edge and a falling edge of an off time in the PWM wave-emitting form of the switching tube on each phase are separated from rising edges and falling edges of an off time in the PWM wave-emitting form of the switching tubes on other phases;
when the motor vehicle with the three-phase inverter stops parking, the PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase are modulated to the original state.
Preferably, the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tube in each phase are separated from the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tubes in the other phase includes:
extracting the PWM wave form of the switching tube of any phase of the U phase, the V phase and the W phase, keeping the duty ratio of the extracted PWM wave form unchanged, and modulating the central time of each switching period of the extracted PWM wave form along the first direction side for a first shift time period delta t1；
Extracting PWM wave-emitting form of the switching tube in any one of the remaining two phases of U phase, V phase and W phase, keeping duty ratio of the extracted PWM wave-emitting form unchanged, and modulating the central time of each switching period of the extracted PWM wave-emitting form along the first direction side or the second direction side for a second shift time period delta t2Wherein the first direction side is opposite to the second direction side.
Preferably, after the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tube in each phase are separated from the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tubes in the other phase, the method further includes:
a control module is arranged in the motor vehicle, a time threshold T is arranged in the control module, and the actual PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase after modulation are detected;
when the actual PWM wave form of the switch tube on each phase is within the wave form, any one of the switch tubes with the rising edge is switched on and the other switch tubes with the rising edgeIs smaller than a time threshold T, or the time difference between any turn-off time with a falling edge and the turn-off time with a falling edge on the other phase is smaller than the time threshold T, the first translation period deltat is increased1For a first translation period 2 x Δ t1Or increasing the second shift period Δ t2For a second shift period 2 x Δ t2；
And repeating the steps until the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is greater than or equal to a time threshold T, or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is greater than or equal to the time threshold T.
Preferably, the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tube in each phase are separated from the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tubes in the other phase includes:
extracting the PWM wave-emitting form of the switching tube of any one of the U phase, the V phase and the W phase, keeping the central moment of each switching period of the extracted PWM wave-emitting form unchanged, increasing the duty ratio of one of two adjacent switching periods of the extracted PWM wave-emitting form by delta D, and reducing the duty ratio of the other switching period by delta D;
and extracting the PWM wave-transmitting form of any one of the remaining two phases of the U phase, the V phase and the W phase, keeping the central time of each switching period of the extracted PWM wave-transmitting form unchanged, increasing the duty ratio of one of the two adjacent switching periods of the extracted PWM wave-transmitting form by m × Δ D, and reducing the duty ratio of the other switching period by m × Δ D.
Preferably, after the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tube in each phase are separated from the rising edge of the on-time and the falling edge of the off-time in the PWM waveform pattern of the switching tubes in the other phase, the method further includes:
a control module is arranged in the motor vehicle, a time threshold T is arranged in the control module, and the actual PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase after modulation are detected;
when the time difference between the switching-on time with a rising edge and the switching-on time with a rising edge on other phases is smaller than a time threshold T or the time difference between the switching-off time with a falling edge and the switching-off time with a falling edge on other phases is smaller than the time threshold T in the actual PWM wave-transmitting form of the switching tube on each phase, increasing delta D;
and repeating the steps until the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is greater than or equal to a time threshold T, or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is greater than or equal to the time threshold T.
The invention also discloses a modulation system of the duty ratio of the switching tube, which comprises a three-phase inverter arranged in the motor vehicle and a control module connected with the three-phase inverter,
when a motor vehicle with a three-phase inverter is parked, a control module acquires PWM wave-emitting forms of switching tubes of the three-phase inverter on a U phase, a V phase and a W phase, wherein the PWM wave-emitting forms comprise n switching cycles and the turn-on time and the turn-off time in each switching cycle;
when the PWM wave-emitting forms of the switching tubes on the U-phase, the V-phase and the W-phase are centrosymmetric and the PWM wave-emitting forms on different phases are consistent, the control module modulates the PWM wave-emitting forms of the switching tubes on any two phases of the U-phase, the V-phase and the W-phase, so that a rising edge and a falling edge of a turn-on moment in the PWM wave-emitting form of the switching tube on each phase are separated from rising edges and falling edges of a turn-off moment in the turn-on moment in the PWM wave-emitting forms of the switching tubes on other phases;
when the motor vehicle with the three-phase inverter stops parking, the control module modulates the PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase to the original state.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the requirement of an electric control system on parasitic inductance when the board card is grounded is reduced, the design of the board card is simplified, the requirement on the common-mode voltage rejection ratio of the driving chip is reduced, and the type selection of the driving chip is simplified;
2. the requirement on the thickness of a cable shielding layer is reduced, the cable cost is reduced, the requirement on the parasitic capacitance of a one-drive-multiple driving transformer is reduced, the design difficulty of the transformer is reduced, and the selection range of suppliers of new energy vehicles is increased.
Drawings
FIG. 1 is a schematic flow chart of a modulation method of the duty ratio of the switching tube according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a modulation method of the duty ratio of the switching tube according to the first embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a modulation method of the duty ratio of the switching tube according to the second embodiment of the present invention.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1, in order to modulate the switching tube and reduce the common mode voltage, the method for modulating the duty ratio of the switching tube includes the following steps:
s100: when a motor vehicle with a three-phase inverter is parked, acquiring PWM wave-emitting forms of switching tubes of the three-phase inverter on a U phase, a V phase and a W phase, wherein the PWM wave-emitting forms comprise n switching cycles and the turn-on time and the turn-off time in each switching cycle;
when the motor vehicle normally runs, the three-phase inverter alternately switches on and off the switching tubes on the U-phase, the V-phase and the W-phase to generate three-phase current. When the three-phase inverter is parked, the switching tubes of the three-phase inverter on the U phase, the V phase and the W phase are alternately switched on and off in the same state due to the fact that the three-phase inverter is not in a driving state, and therefore common-mode voltage is generated. Therefore, in step S100, PWM waveforms, i.e., waveforms in the form of PWM, of the switching tubes of the three-phase inverter in the U-phase, the V-phase, and the W-phase are obtained. Each PWM wave-generating form comprises n switching cycles, and due to the arrangement of the duty ratio, the on and off of the switching tube are reflected in the switching cycles, namely the on time and the off time in each switching cycle, and the generated wave rises and falls.
S200: when the PWM wave-emitting forms of the switching tubes on the U-phase, the V-phase and the W-phase are centrosymmetric and the PWM wave-emitting forms on different phases are consistent, the PWM wave-emitting forms of the switching tubes on any two phases of the U-phase, the V-phase and the W-phase are modulated, so that a rising edge and a falling edge of an off time in the PWM wave-emitting form of the switching tube on each phase are separated from rising edges and falling edges of an off time in the PWM wave-emitting form of the switching tubes on other phases;
the central symmetry of the PWM wave-emitting forms of the switching tubes on the U-phase, the V-phase and the W-phase means that the switching periods of the PWM wave-emitting forms are bilaterally symmetrical by taking the middle time as an axis, namely, the time difference between the on time and the middle time is equal to the time difference between the off time and the middle time. And the PWM wave forms on any phase are consistent and need to be modulated to be staggered. The specific modulation mode is that the rising edge of the on-time and the falling edge of the off-time in the PWM wave-transmitting form of the switching tube on each phase are separated from the rising edge of the on-time and the falling edge of the off-time in the PWM wave-transmitting form of the switching tube on the other phases, that is, the on-time on any phase is different from the on-time on the other phases, and similarly, the off-time on any phase is different from the off-time on the other phases, so that the PWM wave-transmitting forms are different, and the generation of the common mode voltage is reduced.
S300: when the motor vehicle with the three-phase inverter stops parking, the PWM wave forms of the switching tubes on the U phase, the V phase and the W phase are modulated to the original state
The original state is the PWM wave-emitting form of the switching tubes on the U-phase, the V-phase and the W-phase of the modulation key, or the PWM wave-emitting form of the switching tubes on the U-phase, the V-phase and the W-phase is modulated into the state which can be used for normal operation of the motor vehicle.
Through the configuration, only one IGBT can be ensured to act at the same time, and the common-mode voltage is reduced.
The following describes the invention in detail according to different modulation modes in different embodiments.
Example one
Referring to fig. 2, in this embodiment, step S200 includes:
s210: extracting the PWM wave form of the switching tube of any phase of the U phase, the V phase and the W phase, keeping the duty ratio of the extracted PWM wave form unchanged, and modulating the central time of each switching period of the extracted PWM wave form along the first direction side for a first shift time period delta t1；
In step S210, any phase is selected from the three phases in a manner that the duty ratio is not changed, and the center time of each switching cycle in the selected phase is modulated in the first direction side by the first shift period Δ t1The first direction side may be, for example, to the left. After the translation, the turn-on time, the middle time and the turn-off time of the rising edge of each switching period of the phase are all moved to the left by a first translation time period delta t1。
S220: extracting PWM wave-emitting form of the switching tube in any one of the remaining two phases of U phase, V phase and W phase, keeping duty ratio of the extracted PWM wave-emitting form unchanged, and modulating the central time of each switching period of the extracted PWM wave-emitting form along the first direction side or the second direction side for a second shift time period delta t2Wherein the first direction side is opposite to the second directionTo the side
In step S220, any one phase is selected from the remaining two phases in the same manner that the duty ratio is not changed, and the center time of each switching cycle in the selected phase is modulated by the first shift period Δ t along the first direction side or the second direction side2The second direction side may be, for example, rightward. After the translation, the turn-on time, the middle time and the turn-off time of the rising edge of each switching period of the phase are all shifted to the left or right by a first translation time period delta t2. As shown in FIG. 2, if the two selected phases are shifted to the first direction, the first shift period Δ t is obtained1Not equal to the first translation period Δ t2The switching-on time, the middle time and the switching-off time of the rising edge, the middle time and the falling edge of the two selected phases are still staggered; if one of the two selected phases is shifted to the first direction side and the other phase is shifted to the second direction side, the first shift period Δ t1Not equal to the first translation period Δ t2Or a first translation period Δ t1First shift period Δ t2The selected turn-on time, the middle time and the turn-off time of the rising edge, the middle time and the falling edge of the two phases can be still ensured to be staggered.
Preferably, after step S200, the method may further include:
s400: a control module is arranged in the motor vehicle, a time threshold T is arranged in the control module, and the actual PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase after modulation are detected;
s500: when the time difference between the turn-on time with a rising edge and the turn-on time with a rising edge of other phases is smaller than a time threshold T or the time difference between the turn-off time with a falling edge and the turn-off time with a falling edge of other phases is smaller than the time threshold T in the actual PWM wave-generating form of the switching tube on each phase, the first translation time period delta T is increased1For a first translation period 2 x Δ t1Or increasing the second shift period Δ t2For a second shift period 2 x Δ t2；
S600: and repeating the steps until the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is greater than or equal to a time threshold T, or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is greater than or equal to the time threshold T.
That is to say, through the setting of the time threshold T, the time period of the translation is adjusted step by step until the time difference between the turn-on time of the rising edge and the turn-on time of the rising edge on the other phase is greater than or equal to the time threshold T, or the time difference between the turn-off time of any one falling edge and the turn-off time of the falling edge on the other phase is greater than or equal to the time threshold T, thereby ensuring the staggering of the turn-on time and the turn-off time.
Example two
Referring to fig. 3, in this embodiment, step S200 includes:
s210': extracting the PWM wave-emitting form of the switching tube of any one of the U phase, the V phase and the W phase, keeping the central moment of each switching period of the extracted PWM wave-emitting form unchanged, increasing the duty ratio of one of two adjacent switching periods of the extracted PWM wave-emitting form by delta D, and reducing the duty ratio of the other switching period by delta D;
in step S210', any phase is selected from three phases by changing the duty ratio without changing the intermediate time, and the duty ratio of one of the two adjacent switching periods in the extracted PWM waveform is increased by Δ D, and the duty ratio of the other switching period is decreased by Δ D. For example, if the duty ratio of the PWM waveform of the switching tube of any one of the U-phase, V-phase, and W-phase is 50%, when the selected U-phase is selected, the duty ratio of one switching period of the U-phase may be 51%, and the duty ratio of the other adjacent switching period may be 49%, so that the on-time and off-time of the U-phase may be staggered from the other two phases.
S220': and extracting the PWM wave-transmitting form of any one of the remaining two phases of the U phase, the V phase and the W phase, keeping the central time of each switching period of the extracted PWM wave-transmitting form unchanged, increasing the duty ratio of one of the two adjacent switching periods of the extracted PWM wave-transmitting form by m × Δ D, and reducing the duty ratio of the other switching period by m × Δ D.
In step S220', any phase is selected from the remaining two phases by using the same method that the intermediate time is unchanged and the duty ratio is changed, and the duty ratio of one of the two adjacent switching cycles in the extracted PWM waveform is increased by m × Δ D, and the duty ratio of the other switching cycle is decreased by m × Δ D (m ≠ 1). For example, if the duty ratio of the PWM waveform of the switching tube of any one of the U-phase, V-phase, and W-phase is 50%, when the selected switching tube is the V-phase, the duty ratio of one switching period of the U-phase may be 52%, and the duty ratio of another adjacent switching period may be 48% (in this case, m is 2), so that the on-time and off-time of the U-phase may be shifted from the other two phases.
Preferably, after step S200, the method may further include:
s400': a control module is arranged in the motor vehicle, a time threshold T is arranged in the control module, and the actual PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase after modulation are detected;
s500': when the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is smaller than the time threshold T or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is smaller than the time threshold T in the actual PWM wave-generating form of the switching tube on each phase, the delta D is increased;
s600': and repeating the steps until the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is greater than or equal to the time threshold T, or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is greater than or equal to the time threshold T.
Similarly, through the setting of the time threshold T, the value of the Δ D of the duty ratio adjustment is adjusted step by step until the time difference between the turn-on time of the rising edge and the turn-on time of the other phases with the rising edge is greater than or equal to the time threshold T, or the time difference between the turn-off time of any one of the falling edges and the turn-off time of the other phases with the falling edge is greater than or equal to the time threshold T, so that the staggering of the turn-on time and the turn-off time is ensured.
The invention also discloses a modulation system of the duty ratio of the switching tube, which comprises a three-phase inverter arranged in a motor vehicle and a control module connected with the three-phase inverter, wherein when the motor vehicle with the three-phase inverter is parked, the control module acquires the PWM wave-emitting forms of the switching tubes of the three-phase inverter on the U phase, the V phase and the W phase, wherein the PWM wave-emitting forms comprise n switching cycles and the turn-on time and the turn-off time in each switching cycle; when the PWM wave-emitting forms of the switching tubes on the U-phase, the V-phase and the W-phase are centrosymmetric and the PWM wave-emitting forms on different phases are consistent, the control module modulates the PWM wave-emitting forms of the switching tubes on any two phases of the U-phase, the V-phase and the W-phase, so that a rising edge and a falling edge of a turn-on moment in the PWM wave-emitting form of the switching tube on each phase are separated from rising edges and falling edges of a turn-off moment in the turn-on moment in the PWM wave-emitting forms of the switching tubes on other phases; when the motor vehicle with the three-phase inverter stops parking, the control module modulates the PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase to the original state.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.

Claims (6)

1. A method for modulating the duty ratio of a switching tube is characterized by comprising the following steps:
when a motor vehicle with a three-phase inverter is parked, acquiring PWM wave-emitting forms of switching tubes of the three-phase inverter on a U phase, a V phase and a W phase, wherein the PWM wave-emitting forms comprise n switching cycles and the turn-on time and the turn-off time in each switching cycle;
when the PWM wave-emitting forms of the switching tubes on the U-phase, the V-phase and the W-phase are centrosymmetric and the PWM wave-emitting forms on different phases are consistent, the PWM wave-emitting forms of the switching tubes on any two phases of the U-phase, the V-phase and the W-phase are modulated, so that a rising edge and a falling edge of an off time in the PWM wave-emitting form of the switching tube on each phase are separated from rising edges and falling edges of an off time in the PWM wave-emitting form of the switching tubes on other phases;
when the motor vehicle with the three-phase inverter stops parking, the PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase are modulated to the original state.
2. The modulation method according to claim 1, wherein the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that a rising edge and a falling edge of an on-time in the PWM waveform pattern of the switching tube in each phase are separated from a rising edge and a falling edge of an off-time in the PWM waveform pattern of the switching tube in the other phase comprises:
extracting the PWM wave form of the switching tube of any phase of the U phase, the V phase and the W phase, keeping the duty ratio of the extracted PWM wave form unchanged, and modulating the central time of each switching period of the extracted PWM wave form along the first direction side for a first shift time period delta t1；
Extracting PWM wave-emitting form of the switching tube in any one of the remaining two phases of U phase, V phase and W phase, keeping duty ratio of the extracted PWM wave-emitting form unchanged, and modulating the central time of each switching period of the extracted PWM wave-emitting form along the first direction side or the second direction side for a second shift time period delta t2Wherein the first direction side is opposite to the second direction side.
3. The modulation method according to claim 2, wherein the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that the rising edge and the falling edge of the on-time in the PWM waveform pattern of the switching tube in each phase are separated from the rising edge and the falling edge of the off-time in the PWM waveform pattern of the switching tube in the other phase, further comprises:
a control module is arranged in the motor vehicle, a time threshold T is arranged in the control module, and the actual PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase after modulation are detected;
when the time difference between the turn-on time with a rising edge and the turn-on time with a rising edge on other phases is smaller than the time threshold T or the time difference between the turn-off time with a falling edge on any one phase and the turn-off time with a falling edge on other phases is smaller than the time threshold T in the actual PWM wave-generating form of the switching tube on each phase, the first translation time period delta T is increased1For a first translation period 2 x Δ t1Or increasing the second shift period Δ t2For a second shift period 2 x Δ t2；
And repeating the steps until the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is greater than or equal to the time threshold T, or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is greater than or equal to the time threshold T.
4. The modulation method according to claim 1, wherein the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that a rising edge and a falling edge of an on-time in the PWM waveform pattern of the switching tube in each phase are separated from a rising edge and a falling edge of an off-time in the PWM waveform pattern of the switching tube in the other phase comprises:
extracting the PWM wave-emitting form of the switching tube of any one of the U phase, the V phase and the W phase, keeping the central moment of each switching period of the extracted PWM wave-emitting form unchanged, increasing the duty ratio of one of two adjacent switching periods of the extracted PWM wave-emitting form by delta D, and reducing the duty ratio of the other switching period by delta D;
and extracting the PWM wave-transmitting form of any one of the remaining two phases of the U phase, the V phase and the W phase, keeping the central time of each switching period of the extracted PWM wave-transmitting form unchanged, increasing the duty ratio of one of the two adjacent switching periods of the extracted PWM wave-transmitting form by m × Δ D, and reducing the duty ratio of the other switching period by m × Δ D.
5. The modulation method according to claim 4, wherein the step of modulating the PWM waveform patterns of the switching tubes in any two of the U-phase, the V-phase, and the W-phase so that the rising edge and the falling edge of the on-time in the PWM waveform pattern of the switching tube in each phase are separated from the rising edge and the falling edge of the off-time in the PWM waveform pattern of the switching tube in the other phase, further comprises:
a control module is arranged in the motor vehicle, a time threshold T is arranged in the control module, and the actual PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase after modulation are detected;
when the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is smaller than the time threshold T or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is smaller than the time threshold T in the actual PWM wave-generating form of the switching tube on each phase, the delta D is increased;
and repeating the steps until the time difference between the turn-on time with the rising edge and the turn-on time with the rising edge on other phases is greater than or equal to the time threshold T, or the time difference between the turn-off time with the falling edge and the turn-off time with the falling edge on other phases is greater than or equal to the time threshold T.
6. A modulation system of the duty ratio of a switching tube comprises a three-phase inverter arranged in a motor vehicle and a control module connected with the three-phase inverter, and is characterized in that,
when a motor vehicle with a three-phase inverter is parked, a control module acquires PWM wave-emitting forms of switching tubes of the three-phase inverter on a U phase, a V phase and a W phase, wherein the PWM wave-emitting forms comprise n switching cycles and the turn-on time and the turn-off time in each switching cycle;
when the PWM wave-emitting forms of the switching tubes on the U-phase, the V-phase and the W-phase are centrosymmetric and the PWM wave-emitting forms on different phases are consistent, the control module modulates the PWM wave-emitting forms of the switching tubes on any two phases of the U-phase, the V-phase and the W-phase, so that a rising edge and a falling edge of a turn-on moment in the PWM wave-emitting form of the switching tube on each phase are separated from rising edges and falling edges of a turn-off moment in the turn-on moment in the PWM wave-emitting forms of the switching tubes on other phases;
when the motor vehicle with the three-phase inverter stops parking, the control module modulates the PWM wave-emitting forms of the switching tubes on the U phase, the V phase and the W phase to the original state.
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