CN111200371A - Buck-boost driving circuit, air conditioner, method and computer-readable storage medium - Google Patents

Buck-boost driving circuit, air conditioner, method and computer-readable storage medium Download PDF

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Publication number
CN111200371A
CN111200371A CN202010188836.4A CN202010188836A CN111200371A CN 111200371 A CN111200371 A CN 111200371A CN 202010188836 A CN202010188836 A CN 202010188836A CN 111200371 A CN111200371 A CN 111200371A
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China
Prior art keywords
circuit
boost
buck
voltage
tube
Prior art date
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CN202010188836.4A
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Chinese (zh)
Inventor
赵鸣
黄招彬
曾贤杰
文先仕
张杰楠
徐锦清
胡斌
龙谭
井上薰
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202010188836.4A priority Critical patent/CN111200371A/en
Publication of CN111200371A publication Critical patent/CN111200371A/en
Pending legal-status Critical Current

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    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a buck-boost driving circuit, an air conditioner, a method and a computer readable storage medium, wherein the driving method comprises the following steps: a buck circuit configured to be capable of performing a buck process or a rectification process on a power supply signal, the buck circuit including: the two adjacent bridge arms of the bridge circuit are respectively provided with a bidirectional conduction power tube, and the other two adjacent bridge arms of the voltage reduction type circuit are respectively provided with a first reverse blocking switch tube and a second reverse blocking switch tube; the two ends of the third reverse blocking switch tube are connected to the output end of the bridge circuit; and the input end of the boost type circuit is connected to the output end of the third reverse blocking switching tube, and the boost type circuit is configured to perform boost modulation on the power supply signal. According to the technical scheme, the voltage of the direct-current bus of the variable-frequency motor is subjected to voltage boosting and reducing regulation, so that the total loss of the motor is minimum, and the high-efficiency control of the variable-frequency compressor is realized.

Description

Buck-boost driving circuit, air conditioner, method and computer-readable storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a buck-boost driving circuit, a buck-boost driving method, an air conditioner and a computer readable storage medium.
Background
In general, a driving motor of a high-efficiency inverter compressor of an inverter air conditioner is generally a permanent magnet motor, and therefore, an iron loss of the motor is mainly affected by a dc bus voltage of an inverter controller.
For example, in the case of not entering the field weakening operation, the higher the dc bus voltage is, the larger the motor iron loss is, and the lower the dc bus voltage is, the smaller the motor iron loss is. Therefore, the direct current voltage can be properly adjusted to reduce the iron loss of the motor and improve the efficiency of the motor.
In the related art, Power Factor Correction (PFC) of the inverter air conditioner has no voltage reduction function. For example, passive PFCs, single pulse and multi-pulse PFCs have no function of regulating the dc bus voltage, whereas typical boost PFCs can only perform boost regulation, but not buck regulation.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
Therefore, an object of the present invention is to provide a buck-boost driving circuit.
Another object of the present invention is to provide an air conditioner.
The invention also aims to provide a buck-boost driving method.
It is another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, according to an embodiment of a first aspect of the present invention, there is provided a buck-boost driving circuit including: a buck circuit configured to be capable of buck processing or rectifying a power supply signal, the buck circuit comprising: the two adjacent bridge arms of the bridge circuit are respectively provided with a bidirectional conduction power tube, and the other two adjacent bridge arms of the voltage reduction type circuit are respectively provided with a first reverse blocking switch tube and a second reverse blocking switch tube; the two ends of the third reverse blocking switch tube are connected to the output end of the bridge circuit; a boost circuit, an input of the boost circuit being connected to an output of the third reverse blocking switch tube, the boost circuit being configured to perform boost modulation on the supply signal.
In the technical scheme, by arranging the boost type circuit and the buck type circuit, the boost type circuit is configured to be capable of performing boost modulation or filtering processing on a power supply signal, and meanwhile, the buck type circuit can perform buck modulation on the rectified voltage to flexibly adjust the bus voltage, so that not only can the bus voltage be higher than the alternating voltage peak value, but also the bus voltage can be lower than the alternating voltage peak value, that is, the bus voltage is increased or decreased according to the load operation requirement, so as to improve the motor efficiency.
The alternating current signal is connected into the step-down circuit, the step-down circuit can perform step-down modulation or rectification processing on the power supply signal and transmit the power supply signal to the next-stage step-up circuit, and the first reverse blocking switch tube and the second reverse blocking switch tube perform chopping processing on the power supply signal to reduce the bus voltage.
In addition, the boost circuit comprises a first power tube and a second power tube, the first power tube and the second power tube are connected in series at the output end of the buck circuit in the same direction, the second power tube supplies power to a load, the load can be a motor or an inverter and a permanent magnet motor driven by the inverter, and the buck circuit can perform buck modulation so as to further improve the efficiency of the motor and be beneficial to reducing the iron loss of the motor.
In any of the above technical solutions, preferably, the method further includes: and the first end of the inductive element is connected to the high-voltage output end of the third reverse blocking switch tube, and the second end of the inductive element is connected to the high-voltage input end of the boost type circuit.
In this technical solution, by providing an inductive circuit, a first end of the inductive element is connected to the high-voltage output end of the third reverse blocking switch tube, and a second end of the inductive element is connected to the high-voltage input end of the boost circuit, on one hand, the inductive element can perform filtering processing on the power supply signal, and on the other hand, the inductive element is used as the inductive element of the power factor correction circuit, that is, the inductive element is multiplexed by the boost circuit, so as to perform boost modulation on the power supply signal.
In addition, the boosting circuit and the step-down circuit share one inductive element.
In any one of the above technical solutions, preferably, the boost circuit includes: the first power tube is connected between the second end of the inductive element and the low-voltage output end of the third reverse blocking switch tube; the second power tube is connected between the second end of the inductive element and the high-voltage input end of the load; and the capacitive element is connected between a high-voltage input end of the load and a low-voltage output end of the third reverse blocking switch tube, the low-voltage output end of the third reverse blocking switch tube and the low-voltage input end of the load are common endpoints, and the first power tube and the second power tube are controlled to be alternately conducted so as to perform boost modulation on the power supply signal.
In the technical scheme, the boost type circuit comprises a first power tube, a second power tube and a capacitive element, and is connected according to the above manner, the first power tube and the second power tube are controlled to be alternately conducted so as to perform boost modulation on the power supply signal, and the amplitude of the power supply signal can be timely improved while the efficiency of the power supply signal is improved.
In any one of the above technical solutions, preferably, the reverse blocking switching tube body includes: the transistor comprises a first N-channel metal oxide semiconductor tube and a second N-channel metal oxide semiconductor tube, wherein the drains of the two N-channel metal oxide semiconductor tubes are connected; the source electrode of the first N-channel metal oxide semiconductor transistor is connected to the first input end of the comparator, and the source electrode of the second N-channel metal oxide semiconductor transistor is connected to the second input end of the comparator; and the input end of the controller is connected to the output end of the comparator, and the output end of the controller is connected to the grid electrode of the N-channel metal oxide semiconductor tube.
In the technical scheme, the key components of the reverse blocking switch are a comparator and two metal oxide semiconductor tubes which are reversely connected in series, wherein the source electrode of the first N-channel metal oxide semiconductor tube is connected to the first input end of the comparator, the source electrode of the second N-channel metal oxide semiconductor tube is connected to the second input end of the comparator, and the metal oxide semiconductor tubes are controlled to be switched on or switched off through the output result of the comparator.
In any of the above technical solutions, preferably, the reverse blocking switch tube includes: the transistor comprises a first P channel metal oxide semiconductor tube and a second P channel metal oxide semiconductor tube, wherein the source electrodes of the two P channel metal oxide semiconductor tubes are connected; the drain electrode of the first P-channel metal oxide semiconductor transistor is connected to a first input end of the comparator, and the drain electrode of the second P-channel metal oxide semiconductor transistor is connected to a second input end of the comparator; and the input end of the controller is connected to the output end of the comparator, and the output end of the controller is connected to the grid electrode of the N-channel metal oxide semiconductor tube.
In the technical scheme, the key components of the reverse blocking switch are a comparator and two metal oxide semiconductor tubes which are reversely connected in series, wherein the source electrode of the first P-channel metal oxide semiconductor tube is connected to the first input end of the comparator, the source electrode of the second P-channel metal oxide semiconductor tube is connected to the second input end of the comparator, and the metal oxide semiconductor tubes are controlled to be switched on or switched off through the output result of the comparator.
In any of the above technical solutions, preferably, the reverse blocking switch tube includes: the diode and the metal oxide semiconductor tube are connected in series, the metal oxide semiconductor tube is provided with an anti-parallel diode, and the conduction direction of the diode is opposite to that of the anti-parallel diode.
In the technical scheme, the reverse blocking switch tube comprises a diode and a metal oxide semiconductor tube which are connected in series, the metal oxide semiconductor tube is provided with an anti-parallel diode, the conducting direction of the diode is opposite to that of the anti-parallel diode, when the metal oxide semiconductor tube is cut off, the diode connected in series and the anti-parallel diode are cut off due to the fact that the conducting direction is opposite, and therefore the problems of large diode voltage drop, large power consumption and the like are solved, and response efficiency is high.
In any of the above technical solutions, preferably, the first reverse blocking switch and/or the second reverse blocking switch is a diode.
In any of the above technical solutions, preferably, the third reverse blocking switch tube is a diode.
In any of the above technical solutions, preferably, the second power transistor is a diode.
According to a second aspect of the present invention, there is provided an air conditioner comprising: a motor; as above-mentioned buck-boost driving method, the driving circuit is configured to control the motor to operate.
According to a third aspect of the present invention, there is provided a buck-boost driving method, including: determining an alternating current voltage input to the buck circuit and a bus voltage input to the boost circuit; and controlling the boost type circuit to perform boost modulation, or controlling the buck type circuit to perform buck modulation, or controlling the boost type circuit and the buck type circuit to alternately modulate a power supply signal according to the alternating-current voltage and the bus voltage.
In the technical scheme, the boost type circuit is controlled to perform boost modulation, the buck type circuit is controlled to perform buck modulation, or the boost type circuit and the buck type circuit are controlled to alternately modulate a power supply signal according to the alternating current voltage and the bus voltage, so that not only can the bus voltage be higher than the alternating current voltage peak value, but also the bus voltage can be lower than the alternating current voltage peak value, that is, the bus voltage is increased or decreased according to the load operation requirement, and the motor efficiency is improved.
In any of the above technical solutions, preferably, the controlling the step-up circuit to perform step-up modulation, the controlling the step-down circuit to perform step-down modulation, or the controlling the step-up circuit and the step-down circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage specifically includes: comparing a magnitude relationship between a first voltage threshold and the bus voltage; when the first voltage threshold is smaller than the bus voltage, controlling the buck circuit to stop modulation, and comparing the magnitude relation between the bus voltage and the alternating voltage; and when the bus voltage is detected to be greater than or equal to the alternating voltage, controlling the boost circuit to boost and modulate the power supply signal.
In the technical scheme, the step-down circuit is controlled to stop modulating by detecting that the first voltage threshold is smaller than the bus voltage, the magnitude relation between the bus voltage and the alternating voltage is compared, and if the bus voltage is detected to be larger than or equal to the alternating voltage, the step-up circuit is controlled to perform step-up modulation on the power supply signal so as to improve the reliability of the power supply signal.
In any of the above technical solutions, preferably, the step-up circuit is controlled to perform step-up modulation, the step-down circuit is controlled to perform step-down modulation, or the step-up circuit and the step-down circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and specifically, the method further includes: comparing a magnitude relationship between a second voltage threshold and the bus voltage; when the second voltage threshold is detected to be larger than the bus voltage, the boost circuit is controlled to stop modulation, and the magnitude relation between the bus voltage and the alternating voltage is compared; and when the bus voltage is detected to be less than or equal to the alternating voltage, the step-down circuit is controlled to perform step-down modulation on the power supply signal.
In the technical scheme, the magnitude relation between a second voltage threshold and the bus voltage is compared, further, by detecting that the second voltage threshold is larger than the bus voltage, the boost type circuit is controlled to stop modulation, the magnitude relation between the bus voltage and the alternating current voltage is compared, and when the bus voltage is detected to be smaller than or equal to the alternating current voltage, the buck type circuit is controlled to perform buck modulation on the power supply signal, so that the impact of the power supply signal on a rear-stage circuit is reduced, and the efficiency of the motor is improved.
In any of the above technical solutions, preferably, the step-up circuit is controlled to perform step-up modulation, the step-down circuit is controlled to perform step-down modulation, or the step-up circuit and the step-down circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and specifically, the method further includes: comparing a magnitude relationship between a first voltage threshold and the bus voltage, and comparing a magnitude relationship between a second voltage threshold and the bus voltage; and controlling the boost type circuit and the buck type circuit to alternately modulate a power supply signal when the second voltage threshold is detected to be less than or equal to the bus voltage and the first voltage threshold is detected to be greater than or equal to the bus voltage.
In the technical scheme, by comparing the magnitude relation between a first voltage threshold and the bus voltage and comparing the magnitude relation between a second voltage threshold and the bus voltage, if the second voltage threshold is detected to be smaller than or equal to the bus voltage and the first voltage threshold is detected to be larger than or equal to the bus voltage, the boost type circuit and the buck type circuit are controlled to alternately modulate a power supply signal, so that the motor efficiency is further improved.
In any one of the above technical solutions, preferably, the controlling the step-up circuit and the step-down circuit to alternately modulate a power supply signal further includes: controlling the boost circuit to stop modulation, and comparing the magnitude relation between the bus voltage and the alternating voltage; when the bus voltage is detected to be larger than the alternating voltage, the boost circuit is controlled to perform boost modulation on the power supply signal; and when the bus voltage is detected to be less than or equal to the alternating voltage, the step-down circuit is controlled to perform step-down modulation on the power supply signal.
In the technical scheme, the boost circuit is controlled to stop modulation, the magnitude relation between the bus voltage and the alternating voltage is compared, if the bus voltage is detected to be greater than the alternating voltage, the boost circuit is controlled to perform boost modulation on the power supply signal, and further, if the bus voltage is detected to be less than or equal to the alternating voltage, the buck circuit is controlled to perform buck modulation on the power supply signal, so that the impact of the power supply signal on a rear-stage circuit is reduced, and the efficiency of the motor is improved.
In any one of the above technical solutions, preferably, the controlling the buck circuit to perform buck modulation on the power supply signal specifically includes: and controlling the first reverse blocking switch tube and the second reverse blocking switch tube to be alternately conducted and controlling the third reverse blocking switch tube to be conducted according to the positive cycle and the negative cycle of the alternating-current voltage.
In the technical scheme, the first reverse blocking switch tube and the second reverse blocking switch tube are controlled to be alternately conducted according to the positive cycle and the negative cycle of the alternating-current voltage, that is, the first reverse blocking switch tube and the second reverse blocking switch tube respectively and alternately work in two continuous half cycles of the alternating-current voltage, and in addition, the amplitude of the power supply signal input to the boost circuit is reduced by controlling the third reverse blocking switch tube to be conducted.
In any one of the above technical solutions, preferably, the controlling the boost circuit to perform boost modulation on the power supply signal specifically includes: controlling the first power tube to be switched on or switched off according to a specified duty ratio, and controlling the third reverse blocking switch tube to be switched off; and controlling the second power tube and the first power tube to be alternately conducted or controlling the second power tube to be cut off.
In the technical scheme, the first power tube is controlled to be switched on or switched off according to a specified duty ratio, and the third reverse blocking switch tube is controlled to be switched off so as to perform boost modulation on a power supply signal in time.
In addition, in the process of modulating and boosting the first power tube, the second power tube and the first power tube are controlled to be alternately conducted or the second power tube is controlled to be cut off, so that the first power tube and the second power tube are prevented from being directly connected.
According to an aspect of the fourth aspect of the present invention, there is provided a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed, implements the buck-boost driving method defined in any one of the above aspects.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic diagram of a buck-boost driver circuit according to an embodiment of the invention;
fig. 2 shows a schematic diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 3 shows a schematic diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 4 shows a schematic diagram of a buck-boost driver circuit according to another embodiment of the invention;
FIG. 5 illustrates a schematic diagram of an air conditioner according to zero one embodiment of the present invention;
fig. 6 shows a schematic flow diagram of a buck-boost driving method according to an embodiment of the invention;
FIG. 7 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention;
FIG. 8 shows a timing diagram for a buck-boost driving scheme according to one embodiment of the present invention;
FIG. 9 shows a timing diagram for a buck-boost driving scheme according to another embodiment of the present invention;
FIG. 10 shows a timing diagram for a buck-boost driving scheme according to another embodiment of the invention;
FIG. 11 shows a timing diagram for a buck-boost driving scheme according to another embodiment of the present invention;
FIG. 12 shows a schematic of a PI controller for a buck-boost drive scheme according to one embodiment of the present invention;
fig. 13 shows a schematic diagram of a PI controller for a buck-boost drive scheme according to another embodiment of the invention;
fig. 14 shows a schematic diagram of a PI controller for a buck-boost drive scheme according to another embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Embodiments of a buck-boost driving circuit, a method, an air conditioner, and a computer-readable storage medium according to embodiments of the present invention are specifically described below with reference to fig. 1 to 14.
As shown in fig. 1, a buck-boost driving circuit 100 according to a first embodiment of the present invention includes: a buck circuit configured to be capable of buck processing or rectifying a power supply signal, the buck circuit comprising: the two adjacent bridge arms of the bridge circuit are respectively provided with a bidirectional conduction power tube, and the other two adjacent bridge arms of the voltage reduction type circuit are respectively provided with a first reverse blocking switch tube T1 and a second reverse blocking switch tube T2; a third reverse blocking switch tube T3, wherein two ends of the third reverse blocking switch tube T3 are connected to the output end of the bridge circuit; a boost circuit, an input of which is connected to the output of the third reverse blocking switch transistor T3, and the boost circuit is configured to perform boost modulation on the power supply signal.
In the technical scheme, by arranging the boost type circuit and the buck type circuit, the boost type circuit is configured to be capable of performing boost modulation or filtering processing on a power supply signal, and meanwhile, the buck type circuit can perform buck modulation on the rectified voltage to flexibly adjust the bus voltage, so that not only can the bus voltage be higher than the alternating voltage peak value, but also the bus voltage can be lower than the alternating voltage peak value, that is, the bus voltage is increased or decreased according to the load operation requirement, so as to improve the motor efficiency.
The alternating current signal AC is connected into the buck circuit, the buck circuit can perform buck modulation or rectification processing on the power supply signal and transmit the power supply signal to the boost circuit of the next stage, and the first reverse blocking switch tube T1 and the second reverse blocking switch tube T2 perform chopping processing on the power supply signal to reduce the bus voltage.
In addition, the bidirectional pass power transistor includes a first bidirectional pass power transistor M1 and a second bidirectional pass power transistor M2 as shown in fig. 1 to 4.
In addition, the boost circuit comprises a first power tube Q1 and a second power tube Q2, the first power tube Q1 and the second power tube Q2 are connected in series at the output end of the buck circuit in the same direction, the second power tube Q2 supplies power to a load, the load can be a motor or an inverter and a permanent magnet motor driven by the inverter, and the buck circuit can perform buck modulation, so that the efficiency of the motor is further improved, and the iron loss of the motor is also reduced.
In any of the above technical solutions, preferably, the method further includes: a first end of the inductive element L is connected to the high-voltage output end of the third reverse blocking switch tube T3, and a second end of the inductive element L is connected to the high-voltage input end of the boost circuit.
In this embodiment, an inductive circuit is provided, wherein a first end of the inductive element L is connected to the high-voltage output end of the third reverse blocking switch tube T3, and a second end of the inductive element L is connected to the high-voltage input end of the boost circuit, so that on one hand, the inductive element L can perform filtering processing on the power supply signal, and on the other hand, the inductive element L is used as an inductive element of the power factor correction circuit, that is, the inductive element is multiplexed by the boost circuit to perform boost modulation on the power supply signal.
The boosting circuit and the step-down circuit share one inductive element L.
In any one of the above technical solutions, preferably, the boost circuit includes: a first power transistor Q1 connected between the second end of the inductive element L and the low voltage output terminal of the third reverse blocking switch transistor T3; a second power tube Q2 connected between the second end of the inductive element L and the high-voltage input end of the load; and the capacitive element C is connected between a high-voltage input end of the load and a low-voltage output end of the third reverse blocking switch tube T3, the low-voltage output end of the third reverse blocking switch tube T3 and the low-voltage input end of the load are a common endpoint, and the first power tube Q1 and the second power tube Q2 are controlled to be alternately conducted so as to perform boost modulation on the power supply signal.
In the technical scheme, the boost circuit comprises a first power tube Q1, a second power tube Q2 and a capacitive element C, and the first power tube Q1 and the second power tube Q2 are controlled to be alternately conducted by connecting the boost circuit with the capacitive element C in the above manner so as to perform boost modulation on the power supply signal, so that the amplitude of the power supply signal can be timely increased while the efficiency of the power supply signal is increased.
In any one of the above technical solutions, preferably, the reverse blocking switching tube body includes: the transistor comprises a first N-channel metal oxide semiconductor tube and a second N-channel metal oxide semiconductor tube, wherein the drains of the two N-channel metal oxide semiconductor tubes are connected; the source electrode of the first N-channel metal oxide semiconductor transistor is connected to the first input end of the comparator, and the source electrode of the second N-channel metal oxide semiconductor transistor is connected to the second input end of the comparator; and the input end of the controller is connected to the output end of the comparator, and the output end of the controller is connected to the grid electrode of the N-channel metal oxide semiconductor tube.
In the technical scheme, the key components of the reverse blocking switch are a comparator and two metal oxide semiconductor tubes which are reversely connected in series, wherein the source electrode of the first N-channel metal oxide semiconductor tube is connected to the first input end of the comparator, the source electrode of the second N-channel metal oxide semiconductor tube is connected to the second input end of the comparator, and the metal oxide semiconductor tubes are controlled to be switched on or switched off through the output result of the comparator.
In any of the above technical solutions, preferably, the reverse blocking switch tube includes: the transistor comprises a first P channel metal oxide semiconductor tube and a second P channel metal oxide semiconductor tube, wherein the source electrodes of the two P channel metal oxide semiconductor tubes are connected; the drain electrode of the first P-channel metal oxide semiconductor transistor is connected to a first input end of the comparator, and the drain electrode of the second P-channel metal oxide semiconductor transistor is connected to a second input end of the comparator; and the input end of the controller is connected to the output end of the comparator, and the output end of the controller is connected to the grid electrode of the N-channel metal oxide semiconductor tube.
In the technical scheme, the key components of the reverse blocking switch are a comparator and two metal oxide semiconductor tubes which are reversely connected in series, wherein the source electrode of the first P-channel metal oxide semiconductor tube is connected to the first input end of the comparator, the source electrode of the second P-channel metal oxide semiconductor tube is connected to the second input end of the comparator, and the metal oxide semiconductor tubes are controlled to be switched on or switched off through the output result of the comparator.
In any of the above technical solutions, preferably, the reverse blocking switch tube includes: the diode and the metal oxide semiconductor tube are connected in series, the metal oxide semiconductor tube is provided with an anti-parallel diode, and the conduction direction of the diode is opposite to that of the anti-parallel diode.
In the technical scheme, the reverse blocking switch tube comprises a diode and a metal oxide semiconductor tube which are connected in series, the metal oxide semiconductor tube is provided with an anti-parallel diode, the conducting direction of the diode is opposite to that of the anti-parallel diode, when the metal oxide semiconductor tube is cut off, the diode connected in series and the anti-parallel diode are cut off due to the fact that the conducting direction is opposite, and therefore the problems of large diode voltage drop, large power consumption and the like are solved, and response efficiency is high.
In any of the above technical solutions, preferably, the first reverse blocking switch transistor T1 and/or the second reverse blocking switch transistor T2 is a diode.
In any of the above technical solutions, preferably, the third reverse blocking switch transistor T3 is a diode.
In any of the above technical solutions, preferably, the second power transistor Q2 is a diode.
As shown in fig. 5, the air conditioner 200 according to the embodiment of the present invention includes: a motor 202; as with the buck-boost driver circuit 100 described above, the buck-boost driver circuit 100 is configured to control operation of the motor 202.
As shown in fig. 6, the buck-boost driving method according to the embodiment of the present invention includes: step S302, determining an alternating current voltage input to the voltage reduction type circuit and a bus voltage input to the voltage boost type circuit; step S304, controlling the boost type circuit to perform boost modulation, or controlling the buck type circuit to perform buck modulation, or controlling the boost type circuit and the buck type circuit to alternately modulate a power supply signal according to the alternating-current voltage and the bus voltage.
In the technical scheme, the boost type circuit is controlled to perform boost modulation, the buck type circuit is controlled to perform buck modulation, or the boost type circuit and the buck type circuit are controlled to alternately modulate a power supply signal according to the alternating current voltage and the bus voltage, so that not only can the bus voltage be higher than the alternating current voltage peak value, but also the bus voltage can be lower than the alternating current voltage peak value, that is, the bus voltage is increased or decreased according to the load operation requirement, and the motor efficiency is improved.
In any of the above technical solutions, preferably, the controlling the step-up circuit to perform step-up modulation, the controlling the step-down circuit to perform step-down modulation, or the controlling the step-up circuit and the step-down circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage specifically includes: comparing a magnitude relationship between a first voltage threshold and the bus voltage; when the first voltage threshold is smaller than the bus voltage, controlling the buck circuit to stop modulation, and comparing the magnitude relation between the bus voltage and the alternating voltage; and when the bus voltage is detected to be greater than or equal to the alternating voltage, controlling the boost circuit to boost and modulate the power supply signal.
In the technical scheme, the step-down circuit is controlled to stop modulating by detecting that the first voltage threshold is smaller than the bus voltage, the magnitude relation between the bus voltage and the alternating voltage is compared, and if the bus voltage is detected to be larger than or equal to the alternating voltage, the step-up circuit is controlled to perform step-up modulation on the power supply signal so as to improve the reliability of the power supply signal.
In any of the above technical solutions, preferably, the step-up circuit is controlled to perform step-up modulation, the step-down circuit is controlled to perform step-down modulation, or the step-up circuit and the step-down circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and specifically, the method further includes: comparing a magnitude relationship between a second voltage threshold and the bus voltage; when the second voltage threshold is detected to be larger than the bus voltage, the boost circuit is controlled to stop modulation, and the magnitude relation between the bus voltage and the alternating voltage is compared; and when the bus voltage is detected to be less than or equal to the alternating voltage, the step-down circuit is controlled to perform step-down modulation on the power supply signal.
In the technical scheme, the magnitude relation between a second voltage threshold and the bus voltage is compared, further, by detecting that the second voltage threshold is larger than the bus voltage, the boost type circuit is controlled to stop modulation, the magnitude relation between the bus voltage and the alternating current voltage is compared, and when the bus voltage is detected to be smaller than or equal to the alternating current voltage, the buck type circuit is controlled to perform buck modulation on the power supply signal, so that the impact of the power supply signal on a rear-stage circuit is reduced, and the efficiency of the motor is improved.
In any of the above technical solutions, preferably, the step-up circuit is controlled to perform step-up modulation, the step-down circuit is controlled to perform step-down modulation, or the step-up circuit and the step-down circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and specifically, the method further includes: comparing a magnitude relationship between a first voltage threshold and the bus voltage, and comparing a magnitude relationship between a second voltage threshold and the bus voltage; and controlling the boost type circuit and the buck type circuit to alternately modulate a power supply signal when the second voltage threshold is detected to be less than or equal to the bus voltage and the first voltage threshold is detected to be greater than or equal to the bus voltage.
In the technical scheme, by comparing the magnitude relation between a first voltage threshold and the bus voltage and comparing the magnitude relation between a second voltage threshold and the bus voltage, if the second voltage threshold is detected to be smaller than or equal to the bus voltage and the first voltage threshold is detected to be larger than or equal to the bus voltage, the boost type circuit and the buck type circuit are controlled to alternately modulate a power supply signal, so that the motor efficiency is further improved.
In any one of the above technical solutions, preferably, the controlling the step-up circuit and the step-down circuit to alternately modulate a power supply signal further includes: controlling the boost circuit to stop modulation, and comparing the magnitude relation between the bus voltage and the alternating voltage; when the bus voltage is detected to be larger than the alternating voltage, the boost circuit is controlled to perform boost modulation on the power supply signal; and when the bus voltage is detected to be less than or equal to the alternating voltage, the step-down circuit is controlled to perform step-down modulation on the power supply signal.
In the technical scheme, the boost circuit is controlled to stop modulation, the magnitude relation between the bus voltage and the alternating voltage is compared, if the bus voltage is detected to be greater than the alternating voltage, the boost circuit is controlled to perform boost modulation on the power supply signal, and further, if the bus voltage is detected to be less than or equal to the alternating voltage, the buck circuit is controlled to perform buck modulation on the power supply signal, so that the impact of the power supply signal on a rear-stage circuit is reduced, and the efficiency of the motor is improved.
In any one of the above technical solutions, preferably, the controlling the buck circuit to perform buck modulation on the power supply signal specifically includes: and controlling the first reverse blocking switch tube and the second reverse blocking switch tube to be alternately conducted and controlling the third reverse blocking switch tube to be conducted according to the positive cycle and the negative cycle of the alternating-current voltage.
In the technical scheme, the first reverse blocking switch tube and the second reverse blocking switch tube are controlled to be alternately conducted according to the positive cycle and the negative cycle of the alternating-current voltage, that is, the first reverse blocking switch tube and the second reverse blocking switch tube respectively and alternately work in two continuous half cycles of the alternating-current voltage, and in addition, the amplitude of the power supply signal input to the boost circuit is reduced by controlling the third reverse blocking switch tube to be conducted.
In any one of the above technical solutions, preferably, the controlling the boost circuit to perform boost modulation on the power supply signal specifically includes: controlling the first power tube to be switched on or switched off according to a specified duty ratio, and controlling the third reverse blocking switch tube to be switched off; and controlling the second power tube and the first power tube to be alternately conducted or controlling the second power tube to be cut off.
In the technical scheme, the first power tube is controlled to be switched on or switched off according to a specified duty ratio, and the third reverse blocking switch tube is controlled to be switched off so as to perform boost modulation on a power supply signal in time.
In addition, in the process of modulating and boosting the first power tube, the second power tube and the first power tube are controlled to be alternately conducted or the second power tube is controlled to be cut off, so that the first power tube and the second power tube are prevented from being directly connected.
As shown in fig. 7, according to the computer-readable storage medium 400 of the embodiment of the present invention, the computer-readable storage medium 400 stores thereon a computer program, and when the computer program is executed by the air conditioner 200, the buck-boost driving method as defined in any one of the above technical solutions is implemented.
As shown in fig. 1 to 4, the driving control circuit is composed of a boost circuit and a BUCK circuit, the BUCK circuit is an embodiment of a BUCK circuit, an input end of the boost circuit is connected to an output end of the BUCK circuit, an input end of the BUCK circuit is connected to a single-phase alternating current power supply, and an output end of the boost circuit is connected to a load.
Alternatively, the load may be an inverter driving circuit and a permanent magnet motor driven by the inverter driving circuit.
The rectification circuit comprises a first reverse blocking switch tube T1, a second reverse blocking switch tube T2, a first bidirectional power conducting tube M1 and a second bidirectional power conducting tube M2, and the 4 power switch tubes form a bridge circuit.
Two ends of the alternating current power supply are connected with middle connection points of two side bridge arms of the bridge circuit, and a high-voltage output end and a low-voltage output end of the bridge circuit are connected with two ends of a first bidirectional conduction power tube M1 in the BUCK circuit of the next stage, so that direct current output of the rectification circuit is formed.
The first bidirectional pass power transistor M1 and the second bidirectional pass power transistor M2 may be replaced by diodes.
The BUCK circuit comprises 1 third reverse blocking switch tube T3 and an inductive element L, and multiplexes a first reverse blocking switch tube T1 and a second reverse blocking switch tube T2 in the rectifying circuit. The drain of the third reverse blocking switch tube T3 is connected to one end of the inductive element L, the inductive element L is connected to the Boost circuit of the next stage, and the source of the bidirectional conducting power switch tube is connected to the low-voltage end of the dc input.
Wherein, the third reverse blocking switch tube T3 can be replaced by a diode.
The Boost circuit comprises 2 bidirectional conduction power switching tubes, namely a second power tube Q2 and a first power tube Q1, and further comprises a capacitive element C.
The drain of the second power transistor Q2 is connected to the anode of the capacitive element C, the source of the second power transistor Q2 is connected to the drain of the first power transistor Q1, and the source of the first power transistor Q1 is connected to the cathode of the capacitive element C.
Wherein, the second power tube Q2 can be replaced by a diode.
The operation process of the PI controller is shown in fig. 8 to 11, where Vout is the output bus voltage value, Vac is the input ac voltage, and Vin is the absolute value of the input voltage Vac, and the buck-boost driving control method corresponding to the buck-boost driving circuit shown in fig. 1:
as shown in fig. 8, the buck control is implemented by the modulation control of the first reverse blocking switch transistor T1 and the second reverse blocking switch transistor T2, the boost control is implemented by the modulation control of the first power transistor Q1 and the second power transistor Q2, and the first bidirectional pass power transistor M1 and the second bidirectional pass power transistor M2 are used for rectification.
During the buck-boost control, the first reverse blocking switch tube T1 and the second reverse blocking switch tube T2 perform PWM output in a time-sharing manner according to the positive and negative states of the input voltage Vac at a certain duty ratio, when the first reverse blocking switch tube T1 or the second reverse blocking switch tube T2 is at a high level, the third reverse blocking switch tube T3 is at a low level, and when the first reverse blocking switch tube T1 or the second reverse blocking switch tube T2 is at a low level, the third reverse blocking switch tube T3 is at a high level.
When the third reverse blocking switch transistor T3 is replaced by a diode, only the first reverse blocking switch transistor T1 and the second reverse blocking switch transistor T2 are switched.
Ideally, the duty ratio D of the first reverse blocking switch tube T1T1Duty ratio D of the second reverse blocking switch tube T2T2As shown in equations (1-1) and (1-2), respectively:
Figure BDA0002415129770000131
Figure BDA0002415129770000132
when the duty ratio is 1, the first reverse blocking switch tube T1 or the second reverse blocking switch tube T2 is in a Boost region and is in a full-range conducting state; when the duty ratio is more than 0 and less than 1, the first reverse blocking switch tube T1 or the second reverse blocking switch tube T2 is in a Buck voltage reduction modulation area and is in a PWM modulation output state; when the duty ratio is 0, the first reverse blocking switch tube T1 or the second reverse blocking switch tube T2 is in a rectification mode and is in a full-range off state.
During Boost control, the first power tube Q1 performs PWM output with a certain duty ratio, and the output of the second power tube Q2 is opposite to the output of the first power tube Q1. When the second power transistor Q2 is replaced by a diode, only the first power transistor Q1 is switched.
Ideally, the duty ratio D of the first power transistor Q1Q1As shown in equations (1-3).
Figure BDA0002415129770000133
When the duty ratio is 0, the first power tube Q1 is in a Buck region and is in a full-range off state, and when the duty ratio is greater than 0, the Q1 is in a Boost modulation region and is in a PWM modulation output state.
The first bidirectional power transistor M1 and the second bidirectional power transistor M2 are rectifying transistors.
The first bidirectional transistor M1 is turned on/off according to the state of the input voltage Vac, and the output of the second bidirectional transistor M2 is opposite to the output of the first bidirectional transistor M1.
Duty ratio D of the first bidirectional power conducting tube M1M1As shown in equations (1-4).
Figure BDA0002415129770000141
As shown in fig. 2, the rectification circuit includes a first bidirectional pass power transistor M1, a second bidirectional pass power transistor M2, a first reverse blocking switch transistor T1 and a second reverse blocking switch transistor T2. Two ends of the alternating current power supply are connected with middle connection points of two side bridge arms (a second reverse blocking switch tube T2, a second bidirectional conducting power tube M2 or a first reverse blocking switch tube T1 and a first bidirectional conducting power tube M1) of the bridge circuit, and a high-voltage output end and a low-voltage output end of the bridge circuit are connected with two ends of a third reverse blocking switch tube T3 in the BUCK circuit of the next stage to form direct current output of the rectification circuit.
Wherein, the first reverse blocking switch transistor T1 and the second reverse blocking switch transistor T2 may be replaced by diodes.
The BUCK circuit comprises a third reverse blocking switch tube T3 and an inductive element L, and multiplexes a first bidirectional pass power tube M1 and a second bidirectional pass power tube M2 in the rectifying circuit.
The drain of the third reverse blocking switch tube T3 is connected to one end of the inductive element L, the inductive element L is connected to the Boost circuit of the next stage, and the source of the bidirectional conducting power switch tube is connected to the low-voltage end of the dc input.
Wherein, the third reverse blocking switch tube T3 can be replaced by a diode.
The Boost circuit comprises a second power tube Q2, a first power tube Q1 and a capacitive element C.
The drain of the second power transistor Q2 is connected to the anode of the capacitive element C, the source of the second power transistor Q2 is connected to the drain of the first power transistor Q1, and the source of the first power transistor Q1 is connected to the cathode of the capacitive element C. Wherein, the second power tube Q2 can be replaced by a diode.
The buck-boost drive control method corresponding to the circuit shown in fig. 2 is as follows:
the voltage reduction control is realized by the modulation control of a first bidirectional switch-on power tube M1 and a second bidirectional switch-on power tube M2, the voltage boosting control is realized by the modulation control of a first power tube Q1 and a second power tube Q2, and the first reverse blocking switch tube T1 and the second reverse blocking switch tube T2 are used for rectification.
Vout is the output bus voltage value, Vac is the input ac voltage, and Vin is the absolute value of the input voltage Vac.
During the buck-boost control, the first reverse blocking switch tube T1 and the second reverse blocking switch tube T2 perform PWM output in a time-sharing manner according to the positive and negative states of the input voltage Vac at a certain duty ratio, and when the first bidirectional conducting power tube M1 or the second bidirectional conducting power tube M2 is at a high level, the third reverse blocking switch tube T3 is at a low level, and when the first bidirectional conducting power tube M1 or the second bidirectional conducting power tube M2 is at a low level, the third reverse blocking switch tube T3 is at a high level.
When the third reverse blocking switch transistor T3 is replaced by a diode, only the first bidirectional pass power transistor M1 and the second bidirectional pass power transistor M2 are switched.
Ideally, the duty ratios of the outputs of the first reverse blocking switch transistor T1 and the second reverse blocking switch transistor T2 are shown in equations (2-1) and (2-2):
Figure BDA0002415129770000151
Figure BDA0002415129770000152
as shown in fig. 9, when the duty ratio is 1, the first bidirectional transistor M1 or the second bidirectional transistor M2 is in a Boost region and is in a full-range conduction state; when the duty ratio is more than 0 and less than 1, the first bidirectional power tube M1 or the second bidirectional power tube M2 is in a Buck voltage reduction modulation region and is in a PWM modulation output state; when the duty ratio is 0, the first bidirectional switch-on power tube M1 or the second bidirectional switch-on power tube M2 is in a rectification mode and is in a full-off state.
During Boost control, the first power tube Q1 performs PWM output with a certain duty ratio, and the output of the second power tube Q2 is opposite to the output of the first power tube Q1.
When the second power transistor Q2 is replaced by a diode, only the first power transistor Q1 is switched.
Ideally, the duty ratio of the output of the first power transistor Q1 is as shown in equation (2-3).
Figure BDA0002415129770000153
When the duty ratio is 0, the first power tube Q1 is in a Buck voltage reduction zone and is in a full-range turn-off state; when the duty ratio is larger than 0, the Q1 is in a Boost modulation region and is in a PWM modulation output state.
The first bidirectional power transistor M1 and the second bidirectional power transistor M2 are rectifying transistors.
The first bidirectional transistor M1 is turned on/off according to the state of the input voltage Vac, and the output of the second bidirectional transistor M2 is opposite to the output of the first bidirectional transistor M1.
Duty ratio D of the first bidirectional power conducting tube M1T3As shown in equations (2-4).
Figure BDA0002415129770000154
As shown in fig. 3, the rectification circuit includes a first reverse blocking switch transistor T1 and a first bidirectional pass power transistor M1, and a second reverse blocking switch transistor T2 and a second bidirectional pass power transistor M2. Two ends of the alternating current power supply are connected with middle connection points of two side bridge arms of the bridge circuit, and a high-voltage output end and a low-voltage output end of the bridge circuit are connected with two ends of a third reverse blocking switch tube T3 in the BUCK circuit of the next stage, so that direct current output of the rectification circuit is formed.
The first bidirectional pass power transistor M1 and the second bidirectional pass power transistor M2 may be replaced by diodes.
The BUCK circuit comprises a third reverse blocking switch tube T3 and an inductive element L, and a first reverse blocking switch tube T1 and a first bidirectional conduction power tube M1 in the multiplexing rectification circuit. The drain electrode of the third reverse blocking switch tube T3 of the bidirectional conduction power switch tube is connected with one end of an inductive element L, the inductive element L is connected with a Boost circuit of the next stage, and the source electrode of the bidirectional conduction power switch tube is connected with the low-voltage end of the direct current input. Wherein, the third reverse blocking switch tube T3 can be replaced by a diode.
The Boost circuit comprises a second power tube Q2, a first power tube Q1 and a capacitive element C.
The drain of the second power transistor Q2 is connected to the positive electrode of the capacitive element C, the source of the second power transistor Q2 is connected to the drain of the first power transistor Q1, and the source of the first power transistor Q1 is connected to the negative electrode of the capacitive element C. Wherein, the second power tube Q2 can be replaced by a diode.
The buck-boost drive control method corresponding to the buck-boost drive circuit shown in fig. 3 is as follows:
the voltage reduction control is realized by the modulation control of a first reverse blocking switch tube T1 and a first bidirectional conducting power tube M1, the voltage boosting control is realized by the modulation control of a first power tube Q1 and a second power tube Q2, and the second reverse blocking switch tube T2 and a second bidirectional conducting power tube M2 are used for rectification.
Vout is the output bus voltage value, Vac is the input ac voltage, and Vin is the absolute value of the input voltage Vac.
As shown in fig. 10, during the buck-boost control, the first reverse blocking switch T1 and the first bidirectional conducting power transistor M1 perform PWM output in a time-sharing manner according to the positive and negative states of the input voltage Vac at a certain duty ratio, the output of the third reverse blocking switch T3 is opposite to the first reverse blocking switch T1 or the first bidirectional conducting power transistor M1 (when the first reverse blocking switch T1 or the first bidirectional conducting power transistor M1 is at a high level, the third reverse blocking switch T3 is at a low level, and when the first reverse blocking switch T1 or the first bidirectional conducting power transistor M1 is at a low level, the third reverse blocking switch T3 is at a high level).
When the third reverse blocking switch transistor T3 is replaced by a diode, only the first reverse blocking switch transistor T1 and the first bidirectional conducting power transistor M1 are switched.
Ideally, the duty ratio output by the first reverse blocking switch transistor T1 and the first bidirectional conducting power transistor M1 is shown in the following equations (3-1), (3-2):
Figure BDA0002415129770000171
Figure BDA0002415129770000172
when the duty ratio is 1, the first bidirectional pass power tube M1 or the second bidirectional pass power tube M2 is in a Boost region and is in a full-range conducting state; when the duty ratio is more than 0 and less than 1, the first bidirectional power tube M1 or the second bidirectional power tube M2 is in a Buck voltage reduction modulation region and is in a PWM modulation output state; when the duty ratio is 0, the first bidirectional switch-on power tube M1 or the second bidirectional switch-on power tube M2 is in a rectification mode and is in a full-off state.
During Boost control, the first power tube Q1 performs PWM output with a certain duty ratio, and the output of the second power tube Q2 is opposite to the output of the first power tube Q1.
When the second power transistor Q2 is replaced by a diode, only the first power transistor Q1 is switched.
Ideally, the duty ratio D of the first power transistor Q1Q1As shown in formula (3-3).
Figure BDA0002415129770000173
When the duty ratio is 0, the first power tube Q1 is in a Buck voltage reduction zone and is in a full-range turn-off state; when the duty ratio is larger than 0, the Q1 is in a Boost modulation region and is in a PWM modulation output state.
The second reverse blocking switch transistor T2 and the second bidirectional pass power transistor M2 are rectifying. The second reverse blocking switch transistor T2 is turned on/off according to the state of the input voltage Vac, and the output of the second bidirectional conducting power transistor M2 is inverted with respect to the second reverse blocking switch transistor T2. The output of the second reverse blocking switch tube T2 is shown in equation (3-4).
Figure BDA0002415129770000174
As shown in fig. 4, the rectification circuit includes a second reverse blocking switch transistor T2, a second bidirectional pass power transistor M2, a first reverse blocking switch transistor T1, and a first bidirectional pass power transistor M1. 4 power switch tubes constitute a bridge circuit. Two ends of the alternating current power supply are connected with middle connection points of two side bridge arms of the bridge circuit, and a high-voltage output end and a low-voltage output end of the bridge circuit are connected with two ends of a third reverse blocking switch tube T3 in the BUCK circuit of the next stage, so that direct current output of the rectification circuit is formed.
Wherein, the second reverse blocking switch transistor T2 and the second bidirectional pass power transistor M2 can be replaced by diodes.
The BUCK circuit comprises a third reverse blocking switch tube T3, an inductive element L, a second reverse blocking switch tube T2 and a second bidirectional breakover power tube M2 in the multiplexing rectification circuit. The drain electrode of the third reverse blocking switch tube T3 of the bidirectional conduction power switch tube is connected with one end of an inductive element L, the inductive element L is connected with a Boost circuit of the next stage, and the source electrode of the bidirectional conduction power switch tube is connected with the low-voltage end of the direct current input.
Wherein, the third reverse blocking switch tube T3 can be replaced by a diode.
The Boost circuit comprises a second power tube Q2, a first power tube Q1 and a capacitive element C.
The drain of the second power transistor Q2 is connected to the positive electrode of the capacitive element C, the source of the second power transistor Q2 is connected to the drain of the first power transistor Q1, and the source of the first power transistor Q1 is connected to the negative electrode of the capacitive element C.
Wherein, the second power tube Q2 can be replaced by a diode.
The buck-boost drive control method corresponding to the buck-boost drive circuit shown in fig. 4 is as follows:
as shown in fig. 11, the buck control is implemented by the modulation control of the second reverse blocking switch transistor T2 and the second bidirectional pass power transistor M2, the boost control is implemented by the modulation control of the first power transistor Q1 and the second power transistor Q2, and the first reverse blocking switch transistor T1 and the first bidirectional pass power transistor M1 are used for rectification.
Vout is the output bus voltage value, Vac is the input ac voltage, and Vin is the absolute value of the input voltage Vac.
During the buck-boost control, the second reverse blocking switch tube T2 and the second bidirectional conducting power tube M2 perform PWM output in a time-sharing manner according to the positive and negative states of the input voltage Vac at a certain duty ratio, the output of the third reverse blocking switch tube T3 is opposite to the output of the second reverse blocking switch tube T2 or the output of the second bidirectional conducting power tube M2 (when the second reverse blocking switch tube T2 or the second bidirectional conducting power tube M2 is at a high level, the third reverse blocking switch tube T3 is at a low level, and when the second reverse blocking switch tube T2 or the second bidirectional conducting power tube M2 is at a low level, the third reverse blocking switch tube T3 is at a high level).
When the third reverse blocking switch transistor T3 is replaced by a diode, only the second reverse blocking switch transistor T2, the second bidirectional conducting power transistor M2 are switched.
Ideally, the duty ratio D of the second reverse blocking switch tube T2T2And duty cycle D of the second bidirectional power conducting tube M2M2As shown in equations (4-1) and (4-2), respectively:
Figure BDA0002415129770000181
Figure BDA0002415129770000192
when the duty ratio is 1, the second reverse blocking switch tube T2 or the second bidirectional conducting power tube M2 is in a Boost region and is in a full-range conducting state; when the duty ratio is more than 0 and less than 1, the second reverse blocking switch tube T2 or the second bidirectional conducting power tube M2 is in a Buck voltage reduction modulation area and is in a PWM modulation output state; when the duty ratio is 0, the second reverse blocking switch transistor T2 or the second bidirectional conducting power transistor M2 is in a rectification mode and is in a full-off state.
During Boost control, the first power tube Q1 performs PWM output with a certain duty ratio, and the output of the second power tube Q2 is opposite to the output of the first power tube Q1. When the second power transistor Q2 is replaced by a diode, only the first power transistor Q1 is switched.
Ideally, the duty ratio D of the first power transistor Q1Q1As shown in equation (4-3).
Figure BDA0002415129770000193
When the duty ratio is 0, the first power tube Q1 is in a Buck voltage reduction zone and is in a full-range turn-off state; when the duty ratio is larger than 0, the Q1 is in a Boost modulation region and is in a PWM modulation output state.
The first reverse blocking switch transistor T1 and the first bidirectional pass power transistor M1 are rectifying. The first reverse blocking switch transistor T1 is turned on/off according to the state of the input voltage Vac, and the output of the first bidirectional conducting power transistor M1 is opposite to the output of the first reverse blocking switch transistor T1.
Duty ratio D of the first reverse blocking switch tube T1T1As shown in equation (4-4).
Figure BDA0002415129770000194
When the bus voltage value Vout is within the peak value of the input voltage Vin, a Buck voltage reduction modulation area and a Boost voltage reduction modulation area exist in the system; and when the peak value of the input voltage Vin is higher than the peak value of the input voltage Vin, the system is in a Boost modulation area in the whole process.
When the Buck mode and the Boost mode are switched, a buffer modulation interval can be set in the range of Vout +/-Vbuf (Vbuf is more than or equal to 0 and less than Vout), and the Buck mode and the Boost mode alternately work every n modulation cycles in the interval so as to keep the current and the voltage stable during mode switching. Wherein Vbuf and n are set according to the actual debugging condition.
The modulation implementation is described in detail below with reference to fig. 12 to 14.
In order to realize the buck-boost control of the bus voltage, the buck-boost control needs to be realized by setting a bus voltage given value Vcmd.
And determining the working modes of Buck and Boost according to the relation between Vcmd and Vin. When the system is in Boost modulation, a specific modulation driving mode is as shown in fig. 12, so as to determine the Duty ratio Boost Duty of the Boost circuit; when the system is in Buck modulation, the specific modulation driving mode is as shown in fig. 4, so as to determine the Duty cycle Buck Duty of the Buck circuit.
In both fig. 12 and fig. 13, the duty ratio output is realized by a controller (illustrated as a PI controller, for example) so that the actual bus voltage Vout approaches the voltage given value Vcmd.
Wherein Status is binary state quantity, Buck is 1 during modulation, and Boost is 0 during modulation. When Status changes, the corresponding initial Duty ratio Pre Duty is calculated according to the Duty ratio formula of the corresponding mode and is updated to the controller as the initial quantity (such as the integral initial value in the PI controller), so that the responsiveness of the initial state of the controller is improved, the fluctuation range at the switching moment is reduced, and the modulation stability is improved.
Fig. 14 shows another determination of Pre Duty.
At the moment when the Buck mode is switched to the Boost mode, updating a complementary value (1-Dbuck) of an output duty ratio in the Buck mode into a controller as a Boost mode initial quantity (such as an integral initial value in a PI controller); and at the moment when the Boost mode is switched to the Buck mode, updating a complementary value (1-Dboost) of an output duty ratio in the Boost mode into a controller as a Buck mode initial quantity (such as an integration initial value in a PI controller), wherein the method can also realize the modulation stability during switching.
The technical scheme of the invention is described in detail with reference to the accompanying drawings, and the invention provides a boost-buck driving circuit, a method, an air conditioner and a computer-readable storage medium.
The steps in the method of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the circuit of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by instructions associated with a program, which may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), compact disc-Read-Only Memory (CD-ROM), or other Memory, magnetic disk, magnetic tape, or magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (18)

1. A buck-boost driver circuit, comprising:
a buck circuit configured to be capable of buck processing or rectifying a power supply signal, the buck circuit comprising:
the two adjacent bridge arms of the bridge circuit are respectively provided with a bidirectional conduction power tube, and the other two adjacent bridge arms of the voltage reduction type circuit are respectively provided with a first reverse blocking switch tube and a second reverse blocking switch tube;
the two ends of the third reverse blocking switch tube are connected to the output end of the bridge circuit;
a boost circuit, an input of the boost circuit being connected to an output of the third reverse blocking switch tube, the boost circuit being configured to perform boost modulation on the supply signal.
2. The buck-boost driver circuit according to claim 1, further comprising:
and the first end of the inductive element is connected to the high-voltage output end of the third reverse blocking switch tube, and the second end of the inductive element is connected to the high-voltage input end of the boost type circuit.
3. The buck-boost driver circuit of claim 2, wherein the boost type circuit comprises:
the first power tube is connected between the second end of the inductive element and the low-voltage output end of the third reverse blocking switch tube;
the second power tube is connected between the second end of the inductive element and the high-voltage input end of the load;
a capacitive element connected between a high-voltage input end of the load and a low-voltage output end of the third reverse blocking switch tube, the low-voltage output end of the third reverse blocking switch tube and the low-voltage input end of the load being a common end point,
and controlling the first power tube and the second power tube to be alternately conducted so as to perform boost modulation on the power supply signal.
4. The buck-boost driver circuit according to any one of claims 1 to 3, wherein the reverse blocking switching tube comprises:
the transistor comprises a first N-channel metal oxide semiconductor tube and a second N-channel metal oxide semiconductor tube, wherein the drains of the two N-channel metal oxide semiconductor tubes are connected;
the source electrode of the first N-channel metal oxide semiconductor transistor is connected to the first input end of the comparator, and the source electrode of the second N-channel metal oxide semiconductor transistor is connected to the second input end of the comparator;
and the input end of the controller is connected to the output end of the comparator, and the output end of the controller is connected to the grid electrode of the N-channel metal oxide semiconductor tube.
5. The buck-boost driver circuit according to any one of claims 1 to 3, wherein the reverse blocking switch tube comprises:
the transistor comprises a first P channel metal oxide semiconductor tube and a second P channel metal oxide semiconductor tube, wherein the source electrodes of the two P channel metal oxide semiconductor tubes are connected;
the drain electrode of the first P-channel metal oxide semiconductor transistor is connected to a first input end of the comparator, and the drain electrode of the second P-channel metal oxide semiconductor transistor is connected to a second input end of the comparator;
and the input end of the controller is connected to the output end of the comparator, and the output end of the controller is connected to the grid electrode of the P-channel metal oxide semiconductor tube.
6. The buck-boost driver circuit according to any one of claims 1 to 3, wherein the reverse blocking switch tube comprises:
the diode and the metal oxide semiconductor tube are connected in series, the metal oxide semiconductor tube is provided with an anti-parallel diode, and the conduction direction of the diode is opposite to that of the anti-parallel diode.
7. The buck-boost driver circuit according to any one of claims 1 to 3, wherein the first reverse blocking switch and/or the second reverse blocking switch is a diode.
8. The buck-boost driver circuit according to any one of claims 1 to 3,
the third reverse blocking switch tube is a diode.
9. The buck-boost driver circuit according to claim 3,
the second power tube is a diode.
10. An air conditioner, comprising:
a motor;
the buck-boost drive circuit of any one of claims 1 to 9, the drive circuit configured to control operation of the motor.
11. A buck-boost driving method applied to the buck-boost driving circuit according to any one of claims 1 to 9, wherein the driving circuit comprises a buck-type circuit and a boost-type circuit which are electrically connected, and the driving method comprises:
determining an alternating current voltage input to the buck circuit and a bus voltage input to the boost circuit;
and controlling the boost type circuit to perform boost modulation, or controlling the buck type circuit to perform buck modulation, or controlling the boost type circuit and the buck type circuit to alternately modulate a power supply signal according to the alternating-current voltage and the bus voltage.
12. The buck-boost driving method according to claim 11, wherein controlling the boost circuit to perform boost modulation, or controlling the buck circuit to perform buck modulation, or controlling the boost circuit and the buck circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage includes:
comparing a magnitude relationship between a first voltage threshold and the bus voltage;
when the first voltage threshold is smaller than the bus voltage, controlling the buck circuit to stop modulation, and comparing the magnitude relation between the bus voltage and the alternating voltage;
and when the bus voltage is detected to be greater than or equal to the alternating voltage, the boost circuit is controlled to perform boost modulation on the power supply signal.
13. The buck-boost driving method according to claim 11, wherein the step-up circuit is controlled to perform boost modulation, the step-down circuit is controlled to perform buck modulation, or the step-up circuit and the step-down circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and further comprising:
comparing a magnitude relationship between a second voltage threshold and the bus voltage;
when the second voltage threshold is detected to be larger than the bus voltage, the boost circuit is controlled to stop modulation, and the magnitude relation between the bus voltage and the alternating voltage is compared;
and when the bus voltage is detected to be less than or equal to the alternating voltage, the step-down circuit is controlled to perform step-down modulation on the power supply signal.
14. The buck-boost driving method according to claim 11, wherein the step-up circuit is controlled to perform boost modulation, the step-down circuit is controlled to perform buck modulation, or the step-up circuit and the step-down circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and further comprising:
comparing a magnitude relationship between a first voltage threshold and the bus voltage, and comparing a magnitude relationship between a second voltage threshold and the bus voltage;
and controlling the boost type circuit and the buck type circuit to alternately modulate a power supply signal when the second voltage threshold is detected to be less than or equal to the bus voltage and the first voltage threshold is detected to be greater than or equal to the bus voltage.
15. The buck-boost driving method according to claim 11, wherein controlling the boost-type circuit and the buck-type circuit to alternately modulate a power supply signal further comprises:
controlling the boost circuit to stop modulation, and comparing the magnitude relation between the bus voltage and the alternating voltage;
when the bus voltage is detected to be larger than the alternating voltage, the boost circuit is controlled to perform boost modulation on the power supply signal;
and when the bus voltage is detected to be less than or equal to the alternating voltage, the step-down circuit is controlled to perform step-down modulation on the power supply signal.
16. The buck-boost driving method according to any one of claims 11 to 15, wherein controlling the buck-type circuit to perform buck modulation on the power supply signal specifically includes:
and controlling the first reverse blocking switch tube and the second reverse blocking switch tube to be alternately conducted and controlling the third reverse blocking switch tube to be conducted according to the positive cycle and the negative cycle of the alternating-current voltage.
17. The buck-boost driving method according to any one of claims 11 to 15, wherein controlling the boost-type circuit to boost-modulate the power supply signal includes:
controlling the first power tube to be switched on or switched off according to a specified duty ratio, and controlling the third reverse blocking switch tube to be switched off;
and controlling a second power tube and the first power tube to be alternately conducted or controlling the second power tube to be cut off.
18. A computer-readable storage medium, having stored thereon a computer program which, when executed, implements the buck-boost driving method according to any one of claims 11 to 17.
CN202010188836.4A 2020-03-17 2020-03-17 Buck-boost driving circuit, air conditioner, method and computer-readable storage medium Pending CN111200371A (en)

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CN202010188836.4A CN111200371A (en) 2020-03-17 2020-03-17 Buck-boost driving circuit, air conditioner, method and computer-readable storage medium

Applications Claiming Priority (1)

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CN202010188836.4A CN111200371A (en) 2020-03-17 2020-03-17 Buck-boost driving circuit, air conditioner, method and computer-readable storage medium

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117155107A (en) * 2023-03-29 2023-12-01 荣耀终端有限公司 Power factor correction circuit, control method and related device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117155107A (en) * 2023-03-29 2023-12-01 荣耀终端有限公司 Power factor correction circuit, control method and related device
CN117155107B (en) * 2023-03-29 2024-07-16 荣耀终端有限公司 Power factor correction circuit, control method and related device

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