CN115276514B - PWM control device without dead zone output and motor controller - Google Patents

PWM control device without dead zone output and motor controller Download PDF

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Publication number
CN115276514B
CN115276514B CN202211208855.4A CN202211208855A CN115276514B CN 115276514 B CN115276514 B CN 115276514B CN 202211208855 A CN202211208855 A CN 202211208855A CN 115276514 B CN115276514 B CN 115276514B
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output
channel
signal
input end
selector
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CN115276514A (en
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孙卫军
蒋涛
程雯
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Shanghai Sasha Mai Semiconductor Co ltd
Hefei Smart Chip Semiconductor Co ltd
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Shanghai Sasha Mai Semiconductor Co ltd
Hefei Smart Chip Semiconductor 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
    • H02P27/085—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 wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • 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
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a PWM control device and a motor controller without dead zone output, wherein the control device comprises: the complementary signal generating module is used for processing an input clock signal and generating a complementary first level signal and a complementary second level signal; the angle range judging module is used for acquiring the stator current angle of the motor, judging the stator current angle according to the upper limit angle value and the lower limit angle value and generating an angle range confirmation signal; the no-dead-zone waveform generating module is respectively connected with the complementary signal generating module and the angle range judging module and is used for processing the first level signal and the second level signal according to the angle range confirming signal to generate a PWM signal without a dead zone; and the channel output control module is connected with the no-dead-zone waveform generating module and is used for outputting the PWM signal without the dead zone. The invention can control the upper and lower tubes to avoid direct conduction, can effectively avoid the generation of dead zones and improve the running performance of the motor.

Description

PWM control device without dead zone output and motor controller
Technical Field
The invention relates to the technical field of motor control, in particular to a PWM control device without a dead zone in output and a motor controller.
Background
In the existing power electronic industry products, a Pulse Width Modulation (PWM) technology is widely used. In the process of PWM, in order to prevent the risk that the upper power tube and the lower power tube are conducted simultaneously, dead time with a certain width is generally inserted automatically when PWM is output. At present, the control mechanism of the complementary mode PWM module counts clock signals through a counter, and when the value of the counter reaches a set value, a comparator outputs a relevant level, and the output polarity is controlled by a relevant register, and a complementary level signal is generated on a complementary channel. The dead band controller performs dead band calculation and dead band time insertion on the complementary signal to generate dead band time with a certain width. The PWM complementary signal with dead band (Td) is finally output, see fig. 1.
The insertion of dead time generates higher harmonics and causes zero current clamping. The Distortion of the phase Current of the motor caused by the two components is increased, and the THDi (Total Harmonic Current Distortion) is increased, thereby finally influencing the running performance of the motor. The related art generally adopts a software compensation method for a dead zone processing method in a PWM complementary signal, and the method has a disadvantage of occupying a certain amount of computational load of an MCU (micro controller Unit). For the occasion of applying high carrier, the MCU operation window time is very limited, if dead zone compensation is processed, calculation overflow is likely to be caused, calculation cannot be completed within a specified time, and further the motor control performance is influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a PWM control device and a motor controller with no dead zone output, so that the generated PWM signal has no dead zone and the running performance of the motor is improved.
In order to achieve the above object, a first embodiment of the present invention provides a PWM control apparatus with no dead zone output, including: the complementary signal generating module is used for processing an input clock signal and generating a complementary first level signal and a complementary second level signal; the angle range judging module is used for acquiring a stator current angle of the motor, judging the stator current angle according to an upper limit angle value and a lower limit angle value and generating an angle range confirmation signal; the no-dead-zone waveform generating module is respectively connected with the complementary signal generating module and the angle range judging module and is used for processing the first level signal and the second level signal according to the angle range confirming signal to generate a PWM signal without a dead zone; and the channel output control module is connected with the no-dead-zone waveform generating module and is used for outputting the PWM signal without the dead zone.
In addition, the PWM control apparatus with no dead zone output according to the embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the angle range determination module includes: a first comparator, a first input end of which is used for inputting the upper limit angle value, a second input end of which is used for inputting the stator current angle, and the first comparator is used for comparing the stator current angle with the upper limit angle value and outputting a first comparison signal; a second comparator, a first input end of which is used for inputting the stator current angle, a second input end of which is used for inputting the lower limit angle value, and the second comparator is used for comparing the stator current angle with the lower limit angle value and outputting a second comparison signal; the first input end of the AND gate is connected with the output end of the first comparator, the second input end of the AND gate is connected with the output end of the second comparator, and the AND gate is used for performing logic AND processing on the first comparison signal and the second comparison signal to obtain a third level signal; and the input end of the complementary angle controller is connected with the output end of the AND gate, the output end of the complementary angle controller is connected with the no-dead-zone waveform generating module, and the complementary angle controller is used for processing the third level signal and generating the angle range confirming signal.
According to an embodiment of the invention, the complementary angle controller comprises: the input end of the first NOT gate is connected with the output end of the AND gate, and the first NOT gate is used for performing logical NOT processing on the third level signal to obtain a fourth level signal; a first selector, a first input end of which is connected with an output end of the first not gate, a second input end of which is connected with an output end of the and gate, and an output end of which is connected with the no-dead-zone waveform generating module; and the angle zero-crossing controller is connected with the control end of the first selector and is used for controlling the first selector to select the third level signal or the fourth level signal to be output as the angle range confirmation signal.
According to an embodiment of the present invention, the angle range determination module further includes: an upper limit angle value register for registering the upper limit angle value; the stator current angle register is used for registering the stator current angle; a lower limit angle value register for registering the lower limit angle value; the input end of the first digital-to-analog converter is connected with the upper limit angle value register, the output end of the first digital-to-analog converter is connected with the first input end of the first comparator, and the first digital-to-analog converter is used for carrying out digital-to-analog conversion on the upper limit angle value; the input end of the second digital-to-analog converter is connected with the stator current angle register, the output end of the second digital-to-analog converter is respectively connected with the second input end of the first comparator and the first input end of the second comparator, and the second digital-to-analog converter is used for performing digital-to-analog conversion on the stator current angle; and the input end of the third digital-to-analog converter is connected with the lower limit angle value register, the output end of the third digital-to-analog converter is connected with the second input end of the second comparator, and the third digital-to-analog converter is used for performing digital-to-analog conversion on the lower limit angle value.
According to an embodiment of the invention, the no dead zone waveform generating module comprises: a second selector, a first input end of which is used for inputting the first level signal, a second input end of which is used for inputting the second level signal, a control end of which is connected with an output end of the angle range determination module, and the second selector is used for selecting the first level signal or the second level signal as a target level signal to be output under the control of the angle range confirmation signal; a first input end of the third selector is connected with an output end of the second selector, a second input end of the third selector is used for inputting a closing signal of the bridge arm, and an output end of the third selector is connected with a first input end of the channel output control module; a first input end of the fourth selector is connected with an output end of the second selector, a second input end of the fourth selector is used for inputting a closing signal of the bridge arm, and an output end of the fourth selector is connected with a second input end of the channel output control module; and a channel selection controller, a first input end of which is connected with an output end of the angle range determination module, a first output end of which is connected with a control end of the third selector, and a second output end of which is connected with a control end of the fourth selector, wherein the channel selection controller is used for controlling the third selector to select the target level signal output and controlling the fourth selector to select the turn-off signal output, or controlling the third selector to select the turn-off signal output and controlling the fourth selector to select the target level signal output, under the control of the angle range confirmation signal.
According to an embodiment of the present invention, the no dead zone waveform generating module further includes: and the complementary channel polarity register is respectively connected with the second input end of the third selector and the second input end of the fourth selector and is used for setting and outputting a closing signal of the bridge arm.
According to an embodiment of the present invention, the no dead zone waveform generating module further includes: a two-channel switch having a first channel and a second channel, the first channel including a first sub-channel and a second sub-channel, the second channel including a third sub-channel and a fourth sub-channel, the first sub-channel being configured to input the first level signal to the first input terminal of the second selector, the second sub-channel being configured to input the second level signal to the second input terminal of the second selector, the third sub-channel being configured to input the first level signal to the first input terminal of the channel output control module, and the fourth sub-channel being configured to input the second level signal to the second input terminal of the channel output control module; and the dead-zone-free mode controller is connected with the control end of the two-way channel switcher and the channel output control module respectively and is used for controlling the two-way channel switcher to be communicated with the first-way channel and controlling the channel output control module to forbid insertion of dead zones so as to realize the output of the PWM signals without dead zones and controlling the two-way channel switcher to be communicated with the second-way channel and control the channel output control module to be inserted into dead zone time so as to realize the output of the PWM signals with dead zones.
According to an embodiment of the present invention, the channel output control module includes: a first input end of the channel output controller is a first input end of the channel output control module, a second input end of the channel output controller is a second input end of the channel output control module, and a first control end of the channel output controller is connected with the no-dead-zone mode controller; a dead time register for registering dead time; and the dead zone controller is respectively connected with the dead zone time register and the channel output controller and is used for performing dead zone calculation and dead zone time insertion.
According to an embodiment of the present invention, the complementary signal generating module includes: the frequency divider, the counter, the period value register, the comparison value register, the second NOT gate and the output comparator; the frequency divider is connected with the counter, the counter is connected with a first input end of the output comparator, the period value register is connected with the counter, the comparison value register is connected with a second input end of the output comparator, a first output end of the output comparator is connected with an input end of a second not gate, a second output end of the output comparator is used for outputting the first level signal or the second level signal, and an output end of the second not gate is used for outputting the second level signal or the first level signal.
In order to achieve the above object, a second aspect of the present invention provides a motor controller, which includes the above PWM control apparatus with no dead zone output.
The PWM control device and the motor controller with no dead zone output can control the upper pipe and the lower pipe to avoid direct conduction, can effectively avoid the generation of the dead zone, and improve the running performance of the motor.
Drawings
FIG. 1 is a schematic diagram of a PWM complement signal with dead band;
fig. 2 is a schematic structural diagram of a PWM control apparatus with no dead zone output according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an angle range determination module according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a complementary angle controller according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an angle range determination module according to another embodiment of the present invention;
FIG. 6 is a block diagram of a no dead zone waveform generation module according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the input phase current waveform in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of the PWM waveform output in one embodiment of the present invention;
FIG. 9 is a block diagram of a no dead zone waveform generation module according to another embodiment of the present invention;
FIG. 10 is a block diagram of a channel output control module according to an embodiment of the present invention;
FIG. 11 is a block diagram of a complementary signal generating module according to an embodiment of the invention;
fig. 12 is a schematic structural diagram of a motor controller according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A PWM control apparatus and a motor controller without a dead zone in output according to an embodiment of the present invention will be described with reference to fig. 2 to 12.
Fig. 2 is a schematic structural diagram of a PWM control apparatus with no dead zone output according to an embodiment of the present invention.
As shown in fig. 2, the PWM control apparatus outputting no dead zone includes: the system comprises a complementary signal generating module 100, an angle range judging module 200, a no-dead-zone waveform generating module 300 and a channel output control module 400.
The complementary signal generating module 100 is configured to process an input clock signal to generate a complementary first level signal and a complementary second level signal.
And the angle range judging module 200 is configured to obtain a stator current angle of the motor, judge the stator current angle according to the upper limit angle value and the lower limit angle value, and generate an angle range confirmation signal.
Specifically, in motor control, the stator current angle Θ and the phase current polarity relationship, see table 1. Wherein 1 represents a positive current polarity and 0 represents a negative current polarity. The currents flowing through the loads of the respective phases in the three-phase power supply are represented by Ia, ib, and Ic, respectively.
TABLE 1
Θ Ia Ib Ic
11Π/6<Θ<2Π，0<Θ<Π/6 1 0 0
Π/6<Θ<Π/2 1 1 0
Π/2<Θ<5Π/6 0 1 0
5Π/6<Θ<7Π/6 0 1 1
7Π/6<Θ<3Π/2 0 0 1
3Π/2<Θ<11Π/6 1 0 1
Specifically, the stator current angle may be calculated by software, and updated once per operation cycle.
The no-dead-zone waveform generating module 300 is connected to the complementary signal generating module 100 and the angle range determining module 200, respectively, and configured to process the first level signal and the second level signal according to the angle range confirmation signal to generate a PWM signal without a dead zone.
And a channel output control module 400 connected to the no dead zone waveform generating module 300 for outputting a PWM signal without a dead zone.
Therefore, by adding the angle range determination module 200 and the no-dead-zone waveform generation module 300, the generation of the no-dead-zone PWM signal can be realized, so that the motor operation performance can be improved.
In an embodiment of the present invention, as shown in fig. 3, the angle range determining module 200 includes: a first comparator 201, a second comparator 202, an and gate 203 and a complementary angle controller 204.
The first comparator 201 has a first input end for inputting the upper limit angle value, a second input end for inputting the stator current angle, and the first comparator 201 is configured to compare the stator current angle with the upper limit angle value and output a first comparison signal.
The first input terminal of the second comparator 202 is used for inputting the stator current angle, the second input terminal is used for inputting the lower limit angle value, and the second comparator 202 is used for comparing the stator current angle with the lower limit angle value and outputting a second comparison signal.
And the first input end of the and gate 203 is connected with the output end of the first comparator 201, the second input end of the and gate 203 is connected with the output end of the second comparator 202, and the and gate 203 is used for performing logic and processing on the first comparison signal and the second comparison signal to obtain a third level signal.
Specifically, the third level signal is 1, which indicates that the stator current angle is within the range of the upper limit angle value and the lower limit angle value; the third level signal is 0, which indicates that the stator current angle is out of the range of the upper limit angle value and the lower limit angle value.
The input end of the complementary angle controller 204 is connected to the output end of the and gate 203, the output end of the complementary angle controller 204 is connected to the no-dead-zone waveform generating module 300, and the complementary angle controller 204 is configured to process the third level signal to generate the angle range confirming signal.
Specifically, as shown in fig. 4, the complementary angle controller 204 includes: a first not gate 2041, a first selector 2042, and an angle zero crossing controller 2043.
The input end of the first not gate 2041 is connected to the output end of the and gate 203, and the first not gate 2041 is configured to perform a logical not process on the third level signal to obtain a fourth level signal.
A first input terminal of the first selector 2042 is connected to the output terminal of the first not gate 2041, a second input terminal thereof is connected to the output terminal of the and gate 203, and an output terminal thereof is connected to the no-dead-zone waveform generating module 300.
The angle zero-crossing controller 2043 is connected to the control end of the first selector 2042, and is configured to control the first selector 2042 to select the third level signal or the fourth level signal and output the signal as an angle range confirmation signal.
Specifically, the process of the complementary angle controller 204 generating the angle range confirmation signal is: if the angle range includes zero angle, the upper angle limit value and the lower angle limit value cannot be represented by two positive values (a positive value and a negative value), the opposite range is represented by complementary angles (two positive values), and the first selector 2042 selects the fourth level signal to output. If the angle range does not include zero degrees, the angle upper limit value and the angle lower limit value may represent the range by two positive values, and the first selector 2042 selects the third level signal output.
As an example, when the stator current angle is within the complementary angle range, the third level signal is 1, and the fourth level signal is 0; the angle zero-cross controller 2043 controls the first selector 2042 to select the fourth level signal, which is output as the angle range confirmation signal, indicating that it is within the negative polarity range. When the stator current angle is out of the complementary angle range, the third level signal is 0, and the fourth level signal is 1; the angle zero-cross controller 2043 controls the first selector 2042 to select the fourth level signal, which is output as the angle range confirmation signal, to be indicated in the positive polarity range.
In an embodiment of the present invention, as shown in fig. 5, the angle range determination module 200 further includes: an upper limit angle value register 205, a stator current angle register 206, a lower limit angle value register 207, a first digital-to-analog converter 208, a second digital-to-analog converter 209, and a third digital-to-analog converter 210.
The upper limit angle value register 205 is used for registering an upper limit angle value. A stator current angle register 206 for registering the stator current angle. And a lower limit angle value register 207 for registering a lower limit angle value.
An input end of the first digital-to-analog converter 208 is connected to the upper limit angle value register 205, an output end of the first digital-to-analog converter 208 is connected to a first input end of the first comparator 201, and the first digital-to-analog converter 208 is configured to perform digital-to-analog conversion on the upper limit angle value.
And a second digital-to-analog converter 209, an input end of which is connected to the stator current angle register 206, an output end of which is connected to the second input end of the first comparator 201 and the first input end of the second comparator 202, respectively, and the second digital-to-analog converter 209 is configured to perform digital-to-analog conversion on the stator current angle.
An input end of the third digital-to-analog converter 210 is connected to the lower limit angle value register 207, an output end of the third digital-to-analog converter 210 is connected to the second input end of the second comparator 202, and the third digital-to-analog converter 210 is configured to perform digital-to-analog conversion on the lower limit angle value.
In one embodiment of the invention, the no dead zone waveform generation module 300 includes: a second selector 301, a third selector 302, a fourth selector 303, and a channel selection controller 304.
The second selector 301 has a first input end for inputting the first level signal, a second input end for inputting the second level signal, and a control end connected to the output end of the angle range determination module 200, and the second selector 301 is configured to select the first level signal or the second level signal as the target level signal to be output under the control of the angle range confirmation signal.
A first input end of the third selector 302 is connected to an output end of the second selector 301, a second input end is used for inputting a closing signal of the bridge arm, and an output end is connected to a first input end of the channel output control module 400.
A first input end of the fourth selector 303 is connected to an output end of the second selector 301, a second input end of the fourth selector is used for inputting a closing signal of the bridge arm, and an output end of the fourth selector is connected to a second input end of the channel output control module 400.
A channel selection controller 304, a first input end of which is connected to the output end of the angle range determination module 200, a first output end of which is connected to the control end of the third selector 302, and a second output end of which is connected to the control end of the fourth selector 303, wherein the channel selection controller 304 is configured to control the third selector 302 to select the target level signal output and the fourth selector 303 to select the turn-off signal output, or control the third selector 302 to select the turn-off signal output and the fourth selector 303 to select the target level signal output, under the control of the angle range confirmation signal.
Therefore, through the no-dead-zone waveform generating module 300, current harmonics can be reduced, unnecessary dead-zone compensation calculation can be avoided, and then the temperature rise of the inverter module can be reduced and the efficiency of the controller can be improved.
In one embodiment of the present invention, as shown in fig. 6, the no dead zone waveform generating module 300 further includes: and a complementary channel polarity register 305, connected to the second input terminal of the third selector 302 and the second input terminal of the fourth selector 303, respectively, for setting and outputting the shutdown signal of the bridge arm.
In the following, taking the phase current waveform of fig. 7 as an example, if the angle range determination module 200 outputs the angle range confirmation signal of 1, the second selector 301 selects the first level signal and outputs the first level signal to the third selector 302 and the fourth selector 303, respectively. Complementary channel polarity register 305 sets and outputs the bridge arm turn-off signals to third selector 302 and fourth selector 303, respectively. The channel selection controller 304 controls the third selector 302 to select the first level signal output and controls the fourth selector 303 to select the off signal output. The final output PWM waveform of fig. 8 with current greater than zero is for the phase current waveforms of fig. 7.
If the angle range confirmation signal output by the angle range determination module 200 is 0, the second selector 301 selects the second level signal and outputs the second level signal to the third selector 302 and the fourth selector 303, respectively. Complementary channel polarity register 305 sets and outputs the bridge arm turn-off signals to third selector 302 and fourth selector 303, respectively. The channel selection controller 304 controls the third selector 302 to select the off signal output and controls the fourth selector 303 to select the second level signal output. For the phase current waveforms of fig. 7, PWM waveforms with currents less than zero in fig. 8 are ultimately output.
In one embodiment of the present invention, as shown in fig. 9, the no dead zone waveform generating module 300 further includes: a two-way channel switch 306 and a deadband-free mode controller 307.
The two-way channel switch 306 has a first channel and a second channel, the first channel includes a first sub-channel and a second sub-channel, the second channel includes a third sub-channel and a fourth sub-channel, the first sub-channel is used to input the first level signal to the first input terminal of the second selector 301, the second sub-channel is used to input the second level signal to the second input terminal of the second selector 301, the third sub-channel is used to input the first level signal to the first input terminal of the channel output control module 400, and the fourth sub-channel is used to input the second level signal to the second input terminal of the channel output control module 400.
And a dead-zone-free mode controller 307 connected to the control terminal of the two-way channel switch 306 and the channel output control module 400, respectively, for controlling the two-way channel switch 306 to communicate with the first channel, and controlling the channel output control module 400 to prohibit insertion of a dead zone, so as to output a PWM signal without a dead zone, and controlling the two-way channel switch 306 to communicate with the second channel, and controlling the channel output control module 400 to insert a dead zone time, so as to output a PWM signal with a dead zone.
In one embodiment of the present invention, as shown in fig. 10, the channel output control module 400 includes: channel output controller 401, dead time register 402, and dead zone controller 403.
A first input end of the channel output controller 401 is a first input end of the channel output control module 400, a second input end of the channel output controller is a second input end of the channel output control module 400, and the first control end is connected to the no-dead-zone mode controller 307.
A dead time register 402 for registering dead time.
Dead band controller 403, connected to dead band register 402 and channel output controller 401, respectively, performs dead band calculation and dead band insertion.
In one embodiment, as shown in fig. 11, the complementary signal generating module 100 includes: a frequency divider 101, a counter 102, a period value register 103, a comparison value register 104, and a second not gate 105 and an output comparator 106.
The frequency divider 101 is connected to the counter 102, the counter 102 is connected to a first input terminal of the output comparator 106, the period value register 103 is connected to the counter 102, the comparison value register 104 is connected to a second input terminal of the output comparator 106, a first output terminal of the output comparator 106 is connected to an input terminal of the second not gate 105, a second output terminal of the output comparator 106 is configured to output the first level signal or the second level signal, and an output terminal of the second not gate 105 is configured to output the second level signal or the first level signal.
According to the PWM control device without the dead zone in output, disclosed by the embodiment of the invention, the hardware is used for controlling the PWM waveform without the dead zone in output, so that the upper pipe and the lower pipe can be controlled to avoid direct conduction, unnecessary dead zone compensation calculation is avoided, the calculation load is reduced, and the running performance of the motor is improved.
The invention further provides a motor controller corresponding to the embodiment.
Fig. 12 is a block diagram of the structure of the motor controller of the present invention.
As shown in fig. 12, motor controller 10 includes PWM control apparatus 1000 that outputs no dead zone as described above.
The motor controller 10 can control the upper and lower pipes to avoid direct conduction, can effectively avoid dead zone generation and unnecessary dead zone compensation calculation, improves the running performance of the motor, and improves the efficiency of the controller.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (9)

1. A PWM control apparatus that outputs no dead zone, characterized by comprising:
the complementary signal generating module is used for processing an input clock signal and generating a complementary first level signal and a complementary second level signal;
the angle range judging module is used for acquiring a stator current angle of the motor, judging the stator current angle according to an upper limit angle value and a lower limit angle value and generating an angle range confirmation signal;
the no-dead-zone waveform generating module is respectively connected with the complementary signal generating module and the angle range judging module and is used for processing the first level signal and the second level signal according to the angle range confirming signal to generate a PWM signal without a dead zone;
the channel output control module is connected with the no-dead-zone waveform generating module and used for outputting the PWM signal without the dead zone;
the no dead zone waveform generation module comprises:
a second selector, a first input end of which is used for inputting the first level signal, a second input end of which is used for inputting the second level signal, a control end of which is connected with an output end of the angle range determination module, and the second selector is used for selecting the first level signal or the second level signal as a target level signal to be output under the control of the angle range confirmation signal;
a first input end of the third selector is connected with an output end of the second selector, a second input end of the third selector is used for inputting a closing signal of the bridge arm, and an output end of the third selector is connected with a first input end of the channel output control module;
a first input end of the fourth selector is connected with an output end of the second selector, a second input end of the fourth selector is used for inputting a closing signal of the bridge arm, and an output end of the fourth selector is connected with a second input end of the channel output control module;
and a channel selection controller, a first input end of which is connected with an output end of the angle range determination module, a first output end of which is connected with a control end of the third selector, and a second output end of which is connected with a control end of the fourth selector, wherein the channel selection controller is used for controlling the third selector to select the target level signal output and controlling the fourth selector to select the turn-off signal output, or controlling the third selector to select the turn-off signal output and controlling the fourth selector to select the target level signal output, under the control of the angle range confirmation signal.
2. The control device according to claim 1, wherein the angular range determination module includes:
a first comparator, a first input end of which is used for inputting the upper limit angle value, a second input end of which is used for inputting the stator current angle, and the first comparator is used for comparing the stator current angle with the upper limit angle value and outputting a first comparison signal;
a second comparator, a first input end of which is used for inputting the stator current angle, a second input end of which is used for inputting the lower limit angle value, and the second comparator is used for comparing the stator current angle with the lower limit angle value and outputting a second comparison signal;
the first input end of the AND gate is connected with the output end of the first comparator, the second input end of the AND gate is connected with the output end of the second comparator, and the AND gate is used for performing logic AND processing on the first comparison signal and the second comparison signal to obtain a third level signal;
and the input end of the complementary angle controller is connected with the output end of the AND gate, the output end of the complementary angle controller is connected with the no-dead-zone waveform generating module, and the complementary angle controller is used for processing the third level signal and generating the angle range confirming signal.
3. The control device of claim 2, wherein the complementary angle control comprises:
the input end of the first NOT gate is connected with the output end of the AND gate, and the first NOT gate is used for performing logical NOT processing on the third level signal to obtain a fourth level signal;
a first selector, a first input end of which is connected with an output end of the first not gate, a second input end of which is connected with an output end of the and gate, and an output end of which is connected with the no-dead-zone waveform generating module;
and the angle zero-crossing controller is connected with the control end of the first selector and is used for controlling the first selector to select the third level signal or the fourth level signal to be output as the angle range confirmation signal.
4. The control device according to claim 2 or 3, wherein the angular range determination module further includes:
an upper limit angle value register for registering the upper limit angle value;
the stator current angle register is used for registering the stator current angle;
a lower limit angle value register for registering the lower limit angle value;
the input end of the first digital-to-analog converter is connected with the upper limit angle value register, the output end of the first digital-to-analog converter is connected with the first input end of the first comparator, and the first digital-to-analog converter is used for performing digital-to-analog conversion on the upper limit angle value;
the input end of the second digital-to-analog converter is connected with the stator current angle register, the output end of the second digital-to-analog converter is respectively connected with the second input end of the first comparator and the first input end of the second comparator, and the second digital-to-analog converter is used for performing digital-to-analog conversion on the stator current angle;
and the input end of the third digital-to-analog converter is connected with the lower limit angle value register, the output end of the third digital-to-analog converter is connected with the second input end of the second comparator, and the third digital-to-analog converter is used for performing digital-to-analog conversion on the lower limit angle value.
5. The control apparatus of claim 1, wherein the deadband-free waveform generation module further comprises:
and the complementary channel polarity register is respectively connected with the second input end of the third selector and the second input end of the fourth selector and is used for setting and outputting the closing signal of the bridge arm.
6. The control apparatus of claim 1 or 5, wherein the no dead band waveform generation module further comprises: a two-way channel switcher having a first channel and a second channel, the first channel including a first sub-channel and a second sub-channel, the second channel including a third sub-channel and a fourth sub-channel, the first sub-channel being configured to input the first level signal to the first input terminal of the second selector, the second sub-channel being configured to input the second level signal to the second input terminal of the second selector, the third sub-channel being configured to input the first level signal to the first input terminal of the channel output control module, the fourth sub-channel being configured to input the second level signal to the second input terminal of the channel output control module;
and the dead-zone-free mode controller is connected with the control end of the two-way channel switcher and the channel output control module respectively and is used for controlling the two-way channel switcher to be communicated with the first-way channel and control the channel output control module to forbid the insertion of a dead zone so as to realize the output of the PWM signal without the dead zone and control the two-way channel switcher to be communicated with the second-way channel and control the channel output control module to be inserted into the dead zone time so as to realize the output of the PWM signal with the dead zone.
7. The control device of claim 6, wherein the channel output control module comprises:
a first input end of the channel output controller is a first input end of the channel output control module, a second input end of the channel output controller is a second input end of the channel output control module, and a first control end of the channel output controller is connected with the no-dead-zone mode controller;
a dead time register for registering dead time;
and the dead zone controller is respectively connected with the dead zone time register and the channel output controller and is used for performing dead zone calculation and dead zone time insertion.
8. The control device of claim 1, wherein the complementary signal generating module comprises: the frequency divider, the counter, the period value register, the comparison value register, the second NOT gate and the output comparator;
the frequency divider is connected with the counter, the counter is connected with a first input end of the output comparator, the period value register is connected with the counter, the comparison value register is connected with a second input end of the output comparator, a first output end of the output comparator is connected with an input end of a second not gate, a second output end of the output comparator is used for outputting the first level signal or the second level signal, and an output end of the second not gate is used for outputting the second level signal or the first level signal.
9. A motor controller comprising the PWM control apparatus according to any one of claims 1 to 8, having no dead zone in output.
CN202211208855.4A 2022-09-30 2022-09-30 PWM control device without dead zone output and motor controller Active CN115276514B (en)

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US6535402B1 (en) * 2002-07-12 2003-03-18 Delta Electronics Inc. Adaptive compensation of dead time for inverter and converter
JP2018170856A (en) * 2017-03-29 2018-11-01 株式会社豊田中央研究所 Control device of dc/dc converter
CN108155823A (en) * 2017-06-12 2018-06-12 中国石油大学(华东) Based on SOGI-FLL without dead zone half cycle modulator approach
US10547236B1 (en) * 2019-04-23 2020-01-28 Texas Instruments Incorporated Dead band compensation

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