CN108712130B - Single-resistor current sampling phase-shifting control method, device, equipment and storage medium - Google Patents
Single-resistor current sampling phase-shifting control method, device, equipment and storage medium Download PDFInfo
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- CN108712130B CN108712130B CN201810633307.3A CN201810633307A CN108712130B CN 108712130 B CN108712130 B CN 108712130B CN 201810633307 A CN201810633307 A CN 201810633307A CN 108712130 B CN108712130 B CN 108712130B
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Abstract
The invention discloses a single-resistor current sampling phase-shifting control method, a single-resistor current sampling phase-shifting control device, single-resistor current sampling phase-shifting control equipment and a storage medium, wherein the single-resistor current sampling phase-shifting control method is used for summing a first phase current vector pulse width and a second phase current vector pulse width as a target vector pulse width by acquiring two phase current vector pulse widths of an inverter bridge in a target inverter circuit in a sampling period, and respectively comparing the target vector pulse width with different preset vector pulse width intervals; and phase shifting the preset pulse control signal according to the comparison result. According to the technical scheme, the current sampling area is partitioned, the current sampling area falls into different areas according to the target vector pulse width, and the phase of the preset pulse control signal is shifted according to the comparison result, so that the current sampling of the whole area of the single resistor is realized.
Description
Technical Field
The invention relates to the technical field of frequency conversion, in particular to a single-resistor current sampling phase-shifting control method, a single-resistor current sampling phase-shifting control device, single-resistor current sampling phase-shifting control equipment and a storage medium.
Background
The permanent magnet synchronous motor control system used in the outdoor compressor of the variable frequency air conditioner can not install the measuring device due to high temperature, high humidity and the like, and the popularization and the application of the permanent magnet synchronous motor driving system are influenced. Therefore, a simpler, more convenient and more effective current detection method needs to be found, and compared with a Hall current sensor, the current detection is carried out by adopting a single-resistor sampling phase current reconstruction method, the circuit structure is extremely simple, the cost is low, the size is small, and the method is very suitable for application occasions with higher cost requirements.
The single-resistor sampling phase current reconstruction method is characterized in that a current sampling resistor is connected in series with a direct current bus, two-phase current is obtained by analyzing the instantaneous value of the bus current and the switch state, and a third-phase current is obtained by a reconstruction method.
The prior art (publication number CN201310477423.8) discloses a single resistor sampling time compensation method. The method does not consider some special areas where current sampling fails, and can not realize full-area current sampling.
Disclosure of Invention
The invention mainly aims to provide a single-resistor current sampling phase-shifting control method, aiming at realizing current sampling of the whole area of a single resistor.
In order to achieve the above object, the present invention provides a single-resistor current sampling phase-shifting control method, which comprises:
acquiring two-phase current vector pulse width of an inverter bridge in a target inverter circuit in a sampling period, wherein the two-phase current vector pulse width is divided into a first phase current vector pulse width and a second phase current vector pulse width;
summing the first phase current vector pulse width and the second phase current vector pulse width, and taking the summation result as a target vector pulse width;
and respectively comparing the target vector pulse width with different preset vector pulse width intervals, and performing phase shift on preset pulse control signals according to the comparison result, wherein the preset pulse control signals comprise at least one of three paths of pulse control signals output to the inverter bridge.
Preferably, before the obtaining the two-phase current vector pulse width for each sampling period of the inverter bridge, the method further includes:
determining a minimum detection pulse width according to the sampling dead time, the bus current stabilization time and the sampling holding time of the target inverter circuit;
and determining each preset vector pulse width interval according to the minimum detection pulse width.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
and when the target vector pulse width is larger than three times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is larger than the minimum detection pulse width, not performing phase shifting on the preset pulse control signal.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
and when the target vector pulse width is more than three times of the minimum detection pulse width, the first phase current vector pulse width is less than the minimum detection pulse width, and the second phase current vector pulse width is more than the minimum detection pulse width, the preset pulse control signal is shifted to the right, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
and when the target vector pulse width is more than three times of the minimum detection pulse width, the first phase current vector pulse width is more than the minimum detection pulse width, and the second phase current vector pulse width is less than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
and when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is larger than the minimum detection pulse width, the phase of the preset pulse control signal is not shifted.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
and when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is smaller than the minimum detection pulse width, and the second phase current vector pulse width is larger than the minimum detection pulse width, the preset pulse control signal is shifted to the right, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the centered duty ratio.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
and when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is smaller than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the centered duty ratio.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
when the target vector pulse width is smaller than the doubled minimum detection pulse width and larger than the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first phase current vector pulse width or the second phase current vector pulse width;
when the current detection stage of the last time corresponds to the second-phase current vector pulse width and the first-phase current vector pulse width is larger than the minimum detection pulse width, the phase of the preset pulse control signal is not shifted;
and when the current detection stage at the last time corresponds to the second-phase current vector pulse width and the first-phase current vector pulse width is smaller than the minimum detection pulse width, shifting the phase of the preset pulse control signal to the right, wherein the pulse width of the phase shift is the minimum detection pulse width, and the preset pulse control signal is the middle duty ratio of the three-phase pulse control signal.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
when the target vector pulse width is smaller than the doubled minimum detection pulse width and larger than the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first phase current vector pulse width or the second phase current vector pulse width;
when the current detection stage of the last time corresponds to the vector pulse width of the first phase current and the vector pulse width of the second phase current is larger than the minimum detection pulse width, the phase of the preset pulse control signal is not shifted;
and when the current detection stage at the last time corresponds to the first phase current vector pulse width and the second phase current vector pulse width is smaller than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
when the target vector pulse width is smaller than the minimum detection pulse width and larger than one-half of the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first-phase current vector pulse width or the second-phase current vector pulse width;
when the last current detection stage corresponds to a second-phase current vector pulse width, right phase shifting is carried out on a preset pulse control signal, wherein the pulse width of the phase shifting is the minimum detection pulse width, and the preset pulse control signal is the middle and maximum duty ratio of the three-phase pulse control signal;
when the current detection stage at the last time corresponds to the vector pulse width of the first phase current, the preset pulse control signal is the middle and maximum duty ratio of the three-phase pulse control signal, the preset pulse control signal with the middle duty ratio is subjected to leftward phase shifting, and the pulse width subjected to phase shifting is the minimum detection pulse width; and (3) shifting the phase of the preset pulse control signal with the maximum duty ratio to the right, wherein the pulse width of the phase shift is the minimum detection pulse width.
Preferably, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
and when the pulse width of the target vector is less than one half of the minimum detection pulse width, the phase of the preset pulse control signal is not shifted.
In order to achieve the above object, the present invention further provides a single-resistor current sampling phase-shift control device, wherein the single-resistor current sampling phase-shift control device comprises:
a sampling module: the inverter circuit comprises a first phase current vector pulse width and a second phase current vector pulse width, wherein the first phase current vector pulse width and the second phase current vector pulse width are used for acquiring a two-phase current vector pulse width of an inverter bridge in a target inverter circuit in a sampling period;
the summation module is used for summing the first phase current vector pulse width and the second phase current vector pulse width, and taking the summation result as a target vector pulse width;
and the phase shifting module is used for respectively comparing the target vector pulse width with different preset vector pulse width intervals and shifting the phase of a preset pulse control signal according to a comparison result, wherein the preset pulse control signal comprises at least one of three paths of pulse control signals output to the inverter bridge.
The invention also provides a single-resistor current sampling phase-shifting control device, which comprises: the single-resistance current sampling phase-shifting control method comprises a memory, a processor and a single-resistance current sampling phase-shifting control program which is stored on the memory and can run on the processor, wherein the single-resistance current sampling phase-shifting control program is configured to be the steps of the single-resistance current sampling phase-shifting control method.
The invention also provides a storage medium, wherein the storage medium is stored with a single-resistance current sampling phase-shifting control program, and the single-resistance current sampling phase-shifting control program is executed by a processor, and the single-resistance current sampling phase-shifting control method comprises the steps.
According to the technical scheme, the two-phase current vector pulse width of each sampling period of an inverter bridge in a target inverter circuit is obtained, the first-phase current vector pulse width and the second-phase current vector pulse width are summed to obtain a target vector pulse width, and the target vector pulse width is compared with preset vector pulse width thresholds of different preset vector pulse width intervals; and phase shifting the preset pulse control signal according to the comparison result. According to the technical scheme, the current sampling area is partitioned, the current sampling area falls into different areas according to the target vector pulse width, and the phase of the preset pulse control signal is shifted according to the comparison result, so that the current sampling of the whole area of the single resistor is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a system control block diagram of an embodiment of single resistor current sampling;
FIG. 2 is a schematic diagram of an embodiment of single resistor current sampling;
FIG. 3 is a first flowchart of an embodiment of a single resistor current sampling phase shift control method according to the present invention;
FIG. 4 is a second flowchart of an embodiment of a single resistor current sampling phase shift control method according to the present invention;
FIG. 5 is a timing diagram of an embodiment of the novel single resistor AD sampling of the present invention;
FIG. 6 is a timing diagram of one embodiment of single resistor current sampling phase shift control in accordance with the present invention;
FIG. 7 is a functional block diagram of an embodiment of the single-resistor current-sampling phase-shifting control apparatus according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a single-resistor current sampling phase-shifting control method. Referring to fig. 1 and 2, the method is based on a conventional motor frequency converter. The motor frequency converter adopts an AC-DC-AC voltage type frequency converter. The frequency converter comprises a rectifying module, an energy storage module and an inversion module, wherein the inversion module comprises a single resistor for sampling. The method comprises the steps that single-resistor phase current sampling is achieved through series resistors on a bus, and three-phase currents of a motor are reconstructed through analysis of bus current instantaneous values and switch states; and carrying out Clark conversion (Clark) and park conversion (park) on the three-phase current to obtain d-axis current and q-axis current, distributing and synthesizing the currents output by the rotating speed PI output and maximum current-to-torque ratio (MTPA) control, carrying out PI control, and then carrying out Clark-park inverse transformation, SVPWM and six-path PWM output to form a rotating speed and current double-closed-loop control system.
Referring to fig. 3, in an embodiment of the present invention, the method includes:
s300: and acquiring two-phase current vector pulse width of an inverter bridge in the target inverter circuit in a sampling period, wherein the two-phase current vector pulse width is divided into a first-phase current vector pulse width and a second-phase current vector pulse width.
In this embodiment, the inverter bridge of the frequency converter is a common three-phase full bridge, and includes three half bridges formed by six switching devices. The six switching device groups are combined (the signals of the upper half bridge and the lower half bridge of the same bridge arm are opposite) to have 8 safe switching states. Neither of the two switching states 000,111 (here representing the switching states of the three upper legs) will produce significant current in the motor drive. And is therefore called the zero vector. The other 6 switch states are six valid vectors each. They divide the 360 degree voltage space into six sectors of 60 degrees, and any vector within 360 degrees can be synthesized using these six basic effective vectors and two zero quantities. The current vector pulse width of any two phases in this step refers to the pulse width of two current vectors of six basic effective vectors and two zero quantities.
S400: and summing the first phase current vector pulse width and the second phase current vector pulse width, and taking the summation result as a target vector pulse width.
For example, if the pulse width of the first phase current vector is 6 microseconds and the pulse width of the second phase current vector is 5 microseconds, the summed target pulse width is 11 microseconds.
S500: and respectively comparing the target vector pulse width with different preset vector pulse width intervals, and performing phase shift on preset pulse control signals according to the comparison result, wherein the preset pulse control signals comprise at least one of three paths of pulse control signals output to the inverter bridge.
Generally, the duty ratios of three pulse control signals of the inverter bridge are different, and the three pulse control signals can be divided into a PWM control signal with a central duty ratio, a PWM control signal with a maximum duty ratio and a PWM control signal with a minimum duty ratio according to the duty ratio. In this embodiment, the summed vector pulse width is compared with preset vector pulse width thresholds of different preset vector pulse width intervals, and the PWM control signal with the central duty ratio is translated left and right or the PWM control signal with the maximum duty ratio is translated left and right according to the comparison result, so as to reserve sufficient sampling time to solve the current sampling problem in the non-observation region. In this embodiment, the left phase shift refers to a lagging phase shift in the time sequence, and the right phase shift refers to an advancing phase shift in the time sequence.
In this embodiment, the phase shift control processing is performed on the single resistor, the sampling pulse width summation is performed on the PWM wave output by the vector, the PWM wave output by the vector is classified and compared with the preset vector pulse width threshold, and the PWM control signal with the medium duty ratio and the PWM control signal with the maximum duty ratio are translated left and right according to different conditions, so that the phase compensation is realized.
According to the technical scheme, the two-phase current vector pulse width of each sampling period of an inverter bridge in a target inverter circuit is obtained, the first-phase current vector pulse width and the second-phase current vector pulse width are summed to obtain a target vector pulse width, and the target vector pulse width is compared with preset vector pulse width thresholds of different preset vector pulse width intervals; and phase shifting the preset pulse control signal according to the comparison result. According to the technical scheme, the current sampling area is partitioned, the current sampling area falls into different areas according to the target vector pulse width, and the phase of the preset pulse control signal is shifted according to the comparison result, so that the current sampling of the whole area of the single resistor is realized.
Referring to fig. 4, further, before the obtaining the two-phase current vector pulse width of each sampling period of the inverter bridge, the method further includes:
s100: and determining the minimum detection pulse width according to the sampling dead time, the bus current stabilization time and the sampling holding time of the target inverter circuit.
In this embodiment, the minimum detection pulse width is determined by three time parameters, namely, sampling dead time, bus current stabilization time, and sampling holding time, and specifically, the minimum detection pulse width is equal to the sum of the three time parameters, namely, the sampling dead time, the bus current stabilization time, and the sampling holding time. For example, when the minimum detection pulse width is Tn, the sampling dead time is T1, the bus current settling time is T2, and the sample hold time is T3, Tn is T1+ T2+ T3. And when the type of the frequency converter is determined, the sampling dead time, the bus current stabilization time and the sampling holding time are determined.
S200: and determining each preset vector pulse width interval according to the minimum detection pulse width. It should be noted that after the minimum detected pulse width is determined, a plurality of preset vector pulse thresholds are obtained according to a preset rule. For example, if the minimum detected pulse width is Tmin, three times the minimum detected pulse width, i.e., Tmin × 3, is used as a preset vector pulse threshold. The preset vector pulse threshold may also be Tmin × 2, Tmin × 1/2, or the like.
Through the preset vector pulse threshold values, a plurality of intervals are formed, and therefore the target vector pulse width is classified.
In the present embodiment, the target vector pulse widths include the following classifications, i.e., a 1-a 3, b 1-b 3, c 1-c 2, d 1-d 2, and e; setting the sampled first phase current vector pulse width as Ta, and setting the pulse width sampling time corresponding to the first phase current vector pulse width Ta as s 1; the pulse width sampling time corresponding to the second phase current vector pulse width Tb is s 2.
Referring to fig. 5 and 6, specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(a1) the method comprises the following steps And when the target vector pulse width is larger than three times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is larger than the minimum detection pulse width, not performing phase shifting on the preset pulse control signal.
Under this condition, the motor can normally detect two-phase current, and the phase shifting is not needed.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(a2) the method comprises the following steps And when the target vector pulse width is more than three times of the minimum detection pulse width, the first phase current vector pulse width is less than the minimum detection pulse width, and the second phase current vector pulse width is more than the minimum detection pulse width, the preset pulse control signal is shifted to the right, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
At this time, the sampling time of the pulse width s1 corresponding to Ta is too narrow, and the pulse width s2 corresponding to Ta can be sampled normally, so that s1 needs to be widened, the PWM control signal with the intermediate duty ratio is shifted to the right until s1 corresponding to Ta is equal to the minimum detection pulse width Tmin, and at this time, sampling updating is performed before overflow. However, if the s1 comparison value corresponding to Ta is close to or equal to the underflow, it indicates that s1 corresponding to Ta cannot be sampled, and at this time, neither corresponding Ta nor Tb can be sampled, and at this time, no phase shift processing is performed.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(a3) the method comprises the following steps And when the target vector pulse width is more than three times of the minimum detection pulse width, the first phase current vector pulse width is more than the minimum detection pulse width, and the second phase current vector pulse width is less than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
In fig. 5, AD1 and AD2 are two points in time of current sampling. At this time, sampling time of s2 pulse width corresponding to Tb is too narrow, and s1 pulse width corresponding to Ta can be sampled normally, so s2 needs to be widened, and the PWM control signal with the middle duty ratio is shifted to the left until the pulse width of s2 corresponding to Tb is equal to the minimum detection pulse width Tmin, and at this time, sampling update is performed before underflow. However, if the s2 comparison value corresponding to Tb is close to or equal to the overflow, it indicates that s2 corresponding to Tb cannot be sampled, and at this time, neither Ta nor Tb can be sampled, and in this case, neither Ta nor Tb is subjected to phase shift processing.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(b1) the method comprises the following steps And when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is larger than the minimum detection pulse width, the phase of the preset pulse control signal is not shifted.
Under this condition, the motor can normally detect two-phase current, and the phase shifting is not needed.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(b2) the method comprises the following steps And when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is smaller than the minimum detection pulse width, and the second phase current vector pulse width is larger than the minimum detection pulse width, the preset pulse control signal is shifted to the right, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the centered duty ratio.
At this time, the sampling time of the s1 pulse width corresponding to Ta is too narrow, and the s2 pulse width corresponding to Tb can be sampled normally, so that s1 needs to be widened, the PWM control signal with the intermediate duty ratio is shifted to the right until the pulse width of s1 corresponding to Ta is equal to the minimum detection pulse width Tmin, and at this time, sampling updating is performed before overflow, so that two-phase current can be sampled. However, if the s1 comparison value corresponding to Ta is close to or equal to the underflow, it indicates that s1 corresponding to Ta cannot be sampled, and at this time, neither corresponding Ta nor Tb can be sampled, and at this time, no phase shift processing is performed.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(b3) the method comprises the following steps And when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is smaller than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the centered duty ratio.
At this time, sampling time of s2 pulse width corresponding to Tb is too narrow, and s1 pulse width corresponding to Ta can be sampled normally, so s2 needs to be widened, and the PWM control signal with the middle duty ratio is translated leftward until the pulse width of s2 corresponding to Tb is equal to the minimum detection pulse width Tmin, and at this time, sampling update is performed before underflow, so that two-phase current can be sampled. However, if the s2 comparison value corresponding to Tb is close to or equal to the overflow, it indicates that s2 corresponding to Tb cannot be sampled, and at this time, neither Ta nor Tb can be sampled, and in this case, neither Ta nor Tb is subjected to phase shift processing.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(c1) the method comprises the following steps When the target vector pulse width is smaller than the doubled minimum detection pulse width and larger than the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first phase current vector pulse width or the second phase current vector pulse width; in this case, only one of the phase currents can be detected, and if this occurs continuously, the current detection must be performed alternately, as follows.
And when the current detection stage at the last time corresponds to the second-phase current vector pulse width and the first-phase current vector pulse width is larger than the minimum detection pulse width, not shifting the phase of the preset pulse control signal. In this case, the motor does not need to move, the phase current corresponding to Ta can be detected by the motor, and Tb cannot be sampled.
And when the current detection stage at the last time corresponds to the second-phase current vector pulse width and the first-phase current vector pulse width is smaller than the minimum detection pulse width, shifting the phase of the preset pulse control signal to the right, wherein the pulse width of the phase shift is the minimum detection pulse width, and the preset pulse control signal is the middle duty ratio of the three-phase pulse control signal.
At this time, the sampling time of the pulse width of s1 corresponding to Ta is too narrow, so that s1 needs to be widened, the PWM control signal with the intermediate duty ratio is shifted to the right until the pulse width of s1 corresponding to Ta is equal to the minimum detection pulse width Tmin, and at this time, sampling updating is performed before overflow, so that the vector current of s1 corresponding to Ta can be obtained through sampling. However, if the s1 comparison value corresponding to Ta reaches a value close to or equal to underflow (undowflow) or the s2 comparison value corresponding to Tb reaches a value close to or equal to overflow (overflow), it indicates that the s1 corresponding to Ta cannot be sampled.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(c2) the method comprises the following steps When the target vector pulse width is smaller than the doubled minimum detection pulse width and larger than the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first phase current vector pulse width or the second phase current vector pulse width;
and when the current detection stage at the last time corresponds to the first phase current vector pulse width and the second phase current vector pulse width is larger than the minimum detection pulse width, not performing phase shifting on the preset pulse control signal. In this case, phase shifting is not required, the motor can detect the phase current corresponding to Tb, and the phase current corresponding to Ta cannot be sampled.
And when the current detection stage at the last time corresponds to the first phase current vector pulse width and the second phase current vector pulse width is smaller than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
At this time, the sampling time of the s2 pulse width corresponding to Tb is too narrow, so that it is necessary to widen s2, shift the PWM control signal of the intermediate duty ratio to the left until the s2 pulse width corresponding to Tb is equal to the minimum detection pulse width Tmin, and at this time, perform sampling update before underflow, so as to obtain the s2 vector current corresponding to Tb. But if the s2 comparison value corresponding to Tb is reached at or near overflow (overflow) or the s1 comparison value corresponding to Ta is reached at or near underflow (underflow), it indicates that the s2 corresponding to Tb cannot be sampled.
If the s2 vector current corresponding to Tb cannot be detected in this case, s1 corresponding to Ta can be detected, and cyclic detection is alternately performed between c1 and c 2.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(d) the method comprises the following steps And when the target vector pulse width is smaller than the minimum detection pulse width and larger than one-half of the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first-phase current vector pulse width or the second-phase current vector pulse width. In this case, the detected PWM control signal with the largest duty ratio is shifted to the right, and the current detection (i.e., the phase current to be shifted) is performed. If this occurs continuously, the current sensing must be cycled alternately. (if the s1 comparison value corresponding to Ta is close to or equal to the underflow (underflow) or the s2 comparison value corresponding to Tb is close to or equal to the overflow (overflow) during moving, the pulse width of the maximum phase is too narrow, the motor current cannot be detected, and at the moment, the vector currents of s1 corresponding to Ta and s2 corresponding to Tb cannot be detected and cannot be shifted). The concrete implementation is as follows:
when the last current detection stage corresponds to a second-phase current vector pulse width, right phase shifting is carried out on a preset pulse control signal, wherein the pulse width of the phase shifting is the minimum detection pulse width, and the preset pulse control signal is the middle and maximum duty ratio of the three-phase pulse control signal; at this time, the sampling time of the pulse width of s1 corresponding to Ta is too narrow, so that s1 needs to be widened, the PWM control signal with the middle and maximum duty ratio is shifted to the right until the pulse width of s1 corresponding to Ta is equal to the minimum detection pulse width Tmin, and at this time, sampling updating is performed before overflow, so that the vector current of s1 corresponding to Ta can be obtained by sampling. However, if the s1 comparison value corresponding to Ta reaches a value close to or equal to underflow (undowflow) or the s2 comparison value corresponding to Tb reaches a value close to or equal to overflow (overflow), it indicates that the s1 corresponding to Ta cannot be sampled. If the vector current s1 corresponding to Ta cannot be detected in this case, s2 corresponding to Tb is cyclically detected alternately between d1 and d 2.
When the current detection stage at the last time corresponds to the vector pulse width of the first phase current, the preset pulse control signal is the middle and maximum duty ratio of the three-phase pulse control signal, the preset pulse control signal with the middle duty ratio is subjected to leftward phase shifting, and the pulse width subjected to phase shifting is the minimum detection pulse width; and (3) shifting the phase of the preset pulse control signal with the maximum duty ratio to the right, wherein the pulse width of the phase shift is the minimum detection pulse width.
At this time, the sampling time of the s2 pulse width corresponding to Tb is too narrow, so that s2 needs to be widened, the PWM control signal with the maximum duty ratio is shifted to the right, the PWM control signal with the intermediate duty ratio is shifted to the left until the s2 pulse width corresponding to Tb is equal to the minimum detection pulse width Tmin, and at this time, sampling updating is performed before underflow, so that the s2 vector current corresponding to Tb can be obtained through sampling. But if the s2 comparison value for Tb approaches or equals underflow (overflow) or the s1 comparison value for Ta approaches or equals overflow (underflow) when the intermediate duty cycle is shifted to the left, it indicates that the s2 for Tb cannot be sampled. If the s2 vector current corresponding to Tb cannot be detected in this case, it is determined whether s1 corresponding to Ta can be detected, and cyclic detection is performed alternately between d1 and d 2.
Specifically, the target vector pulse width is compared with a plurality of preset vector pulse width thresholds; according to the comparison result, the phase shift is carried out on the preset pulse control signal, and the method specifically comprises the following steps:
(e) the method comprises the following steps And when the pulse width of the target vector is less than one half of the minimum detection pulse width, the phase of the preset pulse control signal is not shifted. In this case, the vector currents s1 corresponding to Ta and s2 corresponding to Tb cannot be detected, and no phase shift is required.
Referring to fig. 7, in order to achieve the above object, the present invention further provides a single-resistor current sampling phase-shift control device, where the single-resistor current sampling phase-shift control device:
the sampling module 10: obtaining a two-phase current vector pulse width of each sampling period of the inverter bridge to obtain a first phase current vector pulse width and a second phase current vector pulse width;
the summing module 20: summing the vector pulse width of the first phase current and the vector pulse width of the second phase current to obtain a target vector pulse width;
the phase shift module 30: comparing the target vector pulse width with preset vector pulse width thresholds of different preset vector pulse width intervals; and phase-shifting the preset pulse control signal according to the comparison result, wherein the preset pulse control signal comprises at least one of the three-phase pulse control signals.
The invention also provides a single-resistor current sampling phase-shifting control device, which comprises: the single-resistance current sampling phase-shifting control method comprises a memory, a processor and a single-resistance current sampling phase-shifting control program which is stored on the memory and can run on the processor, wherein the single-resistance current sampling phase-shifting control program is configured to be the steps of the single-resistance current sampling phase-shifting control method.
The invention also provides a storage medium, wherein the storage medium is stored with a single-resistance current sampling phase-shifting control program, and the single-resistance current sampling phase-shifting control program is executed by a processor, and the single-resistance current sampling phase-shifting control method comprises the steps.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, etc. are to be interpreted as names.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A single-resistor current sampling phase-shifting control method is characterized by comprising
Acquiring two-phase current vector pulse width of an inverter bridge in a target inverter circuit in a sampling period, wherein the two-phase current vector pulse width is divided into a first phase current vector pulse width and a second phase current vector pulse width;
summing the first phase current vector pulse width and the second phase current vector pulse width, and taking the summation result as a target vector pulse width;
respectively comparing the target vector pulse width with different preset vector pulse width intervals, and performing phase shifting on preset pulse control signals according to a comparison result, wherein the preset pulse control signals comprise at least one of three paths of pulse control signals output to the inverter bridge;
the comparing the target vector pulse width with different preset vector pulse width intervals respectively, and shifting the phase of a preset pulse control signal according to the comparison result specifically comprises:
and when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is smaller than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the centered duty ratio.
2. The single-resistor current sampling phase-shifting control method of claim 1, wherein before obtaining the two-phase current vector pulse width of the inverter bridge in the target inverter circuit for one sampling period, the method further comprises:
determining a minimum detection pulse width according to the sampling dead time, the bus current stabilization time and the sampling holding time of the target inverter circuit;
and determining each preset vector pulse width interval according to the minimum detection pulse width.
3. The single-resistor current sampling phase-shift control method according to claim 2, wherein the target vector pulse width is compared with different preset vector pulse width intervals, and the phase-shift of the preset pulse control signal is performed according to the comparison result, specifically comprising:
when the target vector pulse width is larger than three times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is smaller than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered;
and when the target vector pulse width is more than three times of the minimum detection pulse width, the first phase current vector pulse width is less than the minimum detection pulse width, and the second phase current vector pulse width is more than the minimum detection pulse width, the preset pulse control signal is shifted to the right, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
4. The single-resistor current sampling phase-shift control method according to claim 2, wherein the target vector pulse width is compared with different preset vector pulse width intervals, and the phase-shift of the preset pulse control signal is performed according to the comparison result, specifically comprising:
and when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is smaller than the minimum detection pulse width, and the second phase current vector pulse width is larger than the minimum detection pulse width, the preset pulse control signal is shifted to the right, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the centered duty ratio.
5. The single-resistor current sampling phase-shift control method according to any one of claims 1 to 4, wherein comparing the target vector pulse width with different preset vector pulse width intervals respectively, and performing phase shift on a preset pulse control signal according to the comparison result specifically comprises:
when the target vector pulse width is smaller than the doubled minimum detection pulse width and larger than the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first phase current vector pulse width or the second phase current vector pulse width;
and when the current detection stage at the last time corresponds to the second-phase current vector pulse width and the first-phase current vector pulse width is smaller than the minimum detection pulse width, shifting the phase of the preset pulse control signal to the right, wherein the pulse width of the phase shift is the minimum detection pulse width, and the preset pulse control signal is the middle duty ratio of the three-phase pulse control signal.
6. The single-resistor current sampling phase-shift control method according to any one of claims 1 to 4, wherein comparing the target vector pulse width with different preset vector pulse width intervals respectively, and performing phase shift on a preset pulse control signal according to the comparison result specifically comprises:
when the target vector pulse width is smaller than the doubled minimum detection pulse width and larger than the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first phase current vector pulse width or the second phase current vector pulse width;
and when the current detection stage at the last time corresponds to the first phase current vector pulse width and the second phase current vector pulse width is smaller than the minimum detection pulse width, the preset pulse control signal is shifted to the left, wherein the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is the three-phase pulse control signal with the duty ratio centered.
7. The single-resistor current sampling phase-shift control method according to any one of claims 1 to 4, wherein comparing the target vector pulse width with different preset vector pulse width intervals respectively, and performing phase shift on a preset pulse control signal according to the comparison result specifically comprises:
when the target vector pulse width is smaller than the minimum detection pulse width and larger than one-half of the minimum detection pulse width, judging that the current detection stage at the last time corresponds to the first-phase current vector pulse width or the second-phase current vector pulse width;
when the last current detection stage corresponds to a second-phase current vector pulse width, right phase shifting is carried out on a preset pulse control signal, wherein the pulse width of the phase shifting is the minimum detection pulse width, and the preset pulse control signal is the middle and maximum duty ratio of the three-phase pulse control signal;
when the current detection stage at the last time corresponds to the vector pulse width of the first phase current, the preset pulse control signal is the middle and maximum duty ratio of the three-phase pulse control signal, the preset pulse control signal with the middle duty ratio is subjected to leftward phase shifting, and the pulse width subjected to phase shifting is the minimum detection pulse width; and (3) shifting the phase of the preset pulse control signal with the maximum duty ratio to the right, wherein the pulse width of the phase shift is the minimum detection pulse width.
8. The single-resistor current sampling phase-shifting control device is characterized in that:
the sampling module is used for acquiring a two-phase current vector pulse width of an inverter bridge in a target inverter circuit in a sampling period, wherein the two-phase current vector pulse width is divided into a first phase current vector pulse width and a second phase current vector pulse width;
the summation module is used for summing the first phase current vector pulse width and the second phase current vector pulse width, and taking the summation result as a target vector pulse width;
the phase shifting module is used for respectively comparing the target vector pulse width with different preset vector pulse width intervals and shifting the phase of a preset pulse control signal according to a comparison result, wherein the preset pulse control signal comprises at least one of three paths of pulse control signals output to the inverter bridge;
the phase shifting module is further configured to shift the phase of the preset pulse control signal leftward when the target vector pulse width is smaller than three times of the minimum detection pulse width and larger than two times of the minimum detection pulse width, the first phase current vector pulse width is larger than the minimum detection pulse width, and the second phase current vector pulse width is smaller than the minimum detection pulse width, where the shifted pulse width is the minimum detection pulse width, and the preset pulse control signal is a three-phase pulse control signal with a centered duty ratio.
9. A single-resistor current sampling phase-shift control device, characterized in that it comprises: a memory, a processor and a single resistive current sampling phase shift control program stored on the memory and executable on the processor, the single resistive current sampling phase shift control program being configured as the steps of the single resistive current sampling phase shift control method of any one of claims 1 to 7.
10. A storage medium having stored thereon a single-resistor current sampling phase shift control program, the single-resistor current sampling phase shift control program being executed by a processor according to the steps of the single-resistor current sampling phase shift control method of any one of claims 1 to 7.
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| CN110912437B (en) * | 2019-12-02 | 2021-08-17 | 青岛大学 | Single current sampling type three-phase power conversion circuit |
| CN111525868B (en) * | 2020-05-09 | 2021-09-24 | 苏俊 | Phase shifting method and system for three-phase inverter and readable storage medium |
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