CN111245262A - 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
CN111245262A
CN111245262A CN202010188769.6A CN202010188769A CN111245262A CN 111245262 A CN111245262 A CN 111245262A CN 202010188769 A CN202010188769 A CN 202010188769A CN 111245262 A CN111245262 A CN 111245262A
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China
Prior art keywords
circuit
power tube
voltage
buck
power
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CN202010188769.6A
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Chinese (zh)
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CN111245262B (en
Inventor
赵鸣
黄招彬
曾贤杰
文先仕
徐锦清
张杰楠
龙谭
胡斌
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 CN202010188769.6A priority Critical patent/CN111245262B/en
Publication of CN111245262A publication Critical patent/CN111245262A/en
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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)
  • Inverter Devices (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: the totem-pole circuit, totem-pole circuit are configured to can carry out step-up modulation or rectification to the power supply signal and handle, and step-down type circuit, the input of step-down type circuit is connected to totem-pole circuit's output, and step-down type circuit includes: the power supply circuit comprises a totem-pole circuit, a first power tube and a second power tube, wherein the first power tube and the second power tube are sequentially connected in series between a high-voltage output end and a low-voltage output end of the totem-pole circuit, two ends of the second power tube are led out to form a high-voltage bus and a low-voltage bus, the first power tube is configured to be capable of carrying out voltage reduction modulation on a power supply signal, and the first power tube and the second power tube are alternately conducted or kept to be. 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 totem-pole circuit configured to be capable of step-up modulating or rectifying a power supply signal, a step-down circuit having an input connected to an output of the totem-pole circuit, the step-down circuit comprising: the power supply circuit comprises a totem-pole circuit, a first power tube and a second power tube, wherein the first power tube and the second power tube are sequentially connected in series between a high-voltage output end and a low-voltage output end of the totem-pole circuit, two ends of the second power tube are led out to form a high-voltage bus and a low-voltage bus, the first power tube is configured to be capable of carrying out voltage reduction modulation on a power supply signal, and the first power tube and the second power tube are alternately switched on or kept off.
In the technical scheme, the totem-pole circuit and the voltage-reducing type circuit are arranged, the totem-pole circuit is configured to be capable of performing voltage-increasing modulation or rectification processing on a power supply signal, the voltage-reducing type circuit can perform voltage-reducing modulation on the voltage subjected to rectification processing so as to flexibly adjust the bus voltage, the bus voltage can be higher than the alternating-current voltage peak value, the bus voltage can also be lower than the alternating-current voltage peak value, namely, the bus voltage is increased or reduced according to the load operation requirement so as to improve the motor efficiency.
The alternating current signal is connected into the totem-pole circuit, and the totem-pole circuit can perform boosting modulation or rectification processing on the power supply signal and transmit the power supply signal to the next-stage buck circuit.
In addition, the step-down 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 totem-pole 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 step-down circuit can perform step-down modulation so as to further improve the efficiency of the motor.
In addition, one inductive element is shared between the totem-pole circuit and the buck-type circuit.
In any one of the above technical solutions, preferably, the step-down circuit includes: and the filter circuit is connected with the second power tube in parallel and is used for filtering power supply signals flowing through the high-voltage bus and the low-voltage bus.
In the technical scheme, the filter circuit is arranged in the step-down circuit, so that the power supply signal can be subjected to step-down modulation, the load efficiency is improved, and meanwhile, the power supply signal can be subjected to filtering processing to reduce the noise signal input to the load.
In any one of the above technical solutions, preferably, the filter circuit includes: a first inductive element, a first end of the first inductive element is connected to a common end between the first power tube and the second power tube; a first capacitive element, a first end of the first capacitive element being connected to the second end of the first inductive element, a second end of the first capacitive element being connected to the low voltage bus.
In the technical scheme, the filter circuit comprises a first inductive element and a first capacitive element, namely an LC filter structure is formed, and after the first power tube and the second power tube are modulated and reduced in voltage, the filter circuit continues to filter the reduced power supply signal.
In any one of the above technical solutions, preferably, the totem-pole circuit includes: a second inductive element configured to switch in the supply signal; the power supply circuit comprises a bridge circuit, a power tube is arranged in any bridge arm of the bridge circuit, the input end of the bridge circuit is connected to the inductive element, and the bridge circuit is configured to be capable of rectifying the power supply signal; a second capacitive element connected between two output terminals of the bridge circuit.
In the technical scheme, the totem-pole circuit comprises the second inductive element, the bridge circuit and the second capacitive element and is connected in the manner, so that on one hand, the modulation of the bridge circuit can realize the calibration of the power factor, and on the other hand, the modulation and boosting of the bridge circuit are controlled to realize the boosting processing of the power supply signal.
In any one of the above technical solutions, preferably, the power supply terminal is configured to output a power supply signal to the driving circuit, and the bridge circuit includes: the common end between the third power tube and the fourth power tube is connected to the first end of the second inductive element, the first end of the power supply end is connected to the second end of the second inductive element, the common end between the fifth power tube and the sixth power tube is connected to the second output end of the power supply end, wherein the common end between the third power tube and the fifth power tube serves as the high-voltage output end, and the common end between the fourth power tube and the sixth power tube serves as the low-voltage output end.
In the technical scheme, the four power tubes are arranged in the bridge circuit, and the controller drives the four power tubes to perform modulation operation, so that the boosting processing of the power supply signal is realized, the load efficiency is improved, and the power consumption of the motor is reduced.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a diode rectification mode, and the method specifically comprises the following steps: the controller controls the power tubes in the bridge circuit to be cut off, and the anti-parallel diodes rectify the power supply signals.
In the technical scheme, the anti-parallel diodes are arranged for no power tube, when the power tube is cut off, the bridge circuit can be equivalent to a rectifier, at the moment, an alternating current signal flows to a next-stage circuit through the anti-parallel diodes, at the moment, the boosting modulation processing is not carried out, and the impact of overhigh voltage on a next-stage circuit and a load can be effectively reduced.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a synchronous rectification mode, and the method specifically comprises the following steps: when the anti-parallel diodes are conducted, the controller controls the corresponding power tubes to be conducted at a first duty ratio.
In this technical solution, when the anti-parallel diodes are set to be turned on, the controller controls the corresponding power tubes to be turned on at a first duty ratio, for example, when the anti-parallel diodes of the third power tube are turned on, the third power tube is turned on synchronously, so as to implement synchronous rectification processing on the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a semi-synchronous rectification mode, and the controller specifically comprises the following steps: and controlling the third power tube and the fourth power tube to be cut off, controlling the fifth power tube to be switched on by the controller when the anti-parallel diode of the fifth power tube is switched on, and controlling the sixth power tube to be switched on by the controller when the anti-parallel diode of the sixth power tube is switched on.
In the technical scheme, by controlling the third power tube and the fourth power tube to be turned off, when the anti-parallel diode of the fifth power tube is turned on, the controller controls the fifth power tube to be turned on, and when the anti-parallel diode of the sixth power tube is turned on, the controller controls the sixth power tube to be turned on, that is, the fifth power tube and the sixth power tube are half-synchronous rectified, so as to achieve half-synchronous rectification of the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a semi-synchronous rectification mode, and the controller specifically comprises the following steps: and controlling the fifth power tube and the sixth power tube to be cut off, when the anti-parallel diode of the third power tube is switched on, the controller controls the third power tube to be switched on, and when the anti-parallel diode of the fourth power tube is switched on, the controller controls the fourth power tube to be switched on.
In the technical scheme, by controlling the fifth power tube and the sixth power tube to be turned off, when the anti-parallel diode of the third power tube is turned on, the controller controls the third power tube to be turned on, and when the anti-parallel diode of the fourth power tube is turned on, the controller controls the fourth power tube to be turned on, that is, the fourth power tube and the third power tube are half-synchronous rectified, so as to achieve half-synchronous rectification of the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a boost modulation mode, and the method specifically comprises the following steps: controlling the first power tube to be conducted; when the power supply signal flows into a common end between the third power tube and the fourth power tube, the third power tube and the fourth power tube are controlled to be alternately conducted at a second duty ratio, when current flows through an anti-parallel diode of the sixth power tube, the controller controls the sixth power tube to be conducted at a third duty ratio, and meanwhile, the controller keeps the fifth power tube to be stopped.
In this technical scheme, when the first power tube is turned on, the second power tube is controlled to be turned off to avoid a direct current phenomenon, and in addition, when the power supply signal flows into a common end between the third power tube and the fourth power tube, the third power tube and the fourth power tube are controlled to be alternately turned on at a second duty ratio, when a current flows through an anti-parallel diode of the sixth power tube, the controller controls the sixth power tube to be turned on at a third duty ratio, and meanwhile, the controller keeps the fifth power tube turned off to improve the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a boost modulation mode, and the method specifically comprises the following steps: controlling the first power tube to be conducted; when the power supply signal flows into a common end between the fifth power tube and the sixth power tube, the fifth power tube and the sixth power tube are controlled to be alternately conducted at a fourth duty ratio, when current flows through an anti-parallel diode of the fourth power tube, the controller controls the fourth power tube to be conducted at the fifth duty ratio, and meanwhile, the controller keeps the third power tube to be stopped.
In this technical scheme, when the first power tube is turned on, the second power tube is controlled to be turned off to avoid a direct current phenomenon, and in addition, when the power supply signal flows into a common end between the fifth power tube and the sixth power tube, the fifth power tube and the sixth power tube are controlled to be alternately turned on at a fourth duty ratio, when a current flows through an anti-parallel diode of the fourth power tube, the controller controls the fourth power tube to be turned on at a fifth duty ratio, and meanwhile, the controller keeps the third power tube turned off to improve the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the switch tube, the second power tube is provided with an anti-parallel diode, and the controller drives the buck circuit to work in a filtering mode, and the method specifically comprises the following steps: the controller controls the second power tube to be cut off, and the filter circuit carries out filtering processing on the power supply signal.
In the technical scheme, the second power tube is controlled to be cut off, the filter circuit carries out filtering processing on the power supply signal, the filtering processing is realized only through an LC structure, and voltage reduction modulation processing is not carried out.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the switching tube, drives the buck circuit to perform buck modulation, and specifically comprises the following steps: the controller controls the first power tube to be conducted at a sixth duty ratio, and simultaneously, the controller controls the second power tube and the first power tube to be conducted or kept off alternately.
In the technical scheme, the first power tube is controlled to be conducted at a sixth duty ratio, and meanwhile, the controller controls the second power tube and the first power tube to be conducted or kept to be cut off alternately, so that the power supply signal is subjected to voltage reduction modulation processing.
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 totem-pole circuit; and controlling the totem-pole circuit to perform voltage boosting modulation, or controlling the buck-type circuit to perform voltage reduction modulation, or controlling the totem-pole 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 totem-pole circuit is controlled to perform boost modulation or the buck circuit is controlled to perform buck modulation or the totem-pole circuit and the buck circuit are controlled to alternately modulate the power supply signal according to the alternating current voltage and the bus voltage, so that the bus voltage can be higher than the peak value of the alternating current voltage, the bus voltage can be lower than the peak value of the alternating current voltage, that is, the bus voltage is increased or reduced according to the load operation requirement, and the motor efficiency is improved.
In any of the above technical solutions, preferably, the controlling the totem-pole circuit to perform voltage boosting modulation, or controlling the buck-type circuit to perform voltage buck modulation, or controlling the totem-pole circuit and the buck-type 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 totem-pole circuit to perform boost modulation on the power supply signal.
In the technical scheme, the voltage-reducing 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 totem-pole circuit is controlled to perform voltage-increasing 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 controlling the totem-pole circuit to perform voltage boosting modulation, the controlling the buck-type circuit to perform voltage buck modulation, or the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage 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 totem-pole circuit is controlled to stop modulation, and the magnitude relation between the bus voltage and the alternating-current 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 totem-pole circuit is controlled to stop modulation, the magnitude relation between the bus voltage and the alternating voltage is compared, and when the bus voltage is detected to be smaller than or equal to the alternating voltage, the voltage reduction type circuit is controlled to perform voltage reduction 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 controlling the totem-pole circuit to perform voltage boosting modulation, the controlling the buck-type circuit to perform voltage buck modulation, or the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage 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 when 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 totem-pole circuit and the buck-type circuit are controlled to alternately modulate a power supply signal.
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 totem-pole circuit and the buck-type circuit are controlled to alternately modulate the power supply signal so as to further improve the motor efficiency.
In any one of the above technical solutions, preferably, the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal further includes: controlling the totem-pole 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 totem-pole 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 totem-pole circuit is controlled to stop modulating, 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 totem-pole 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.
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 illustrates a schematic diagram of an air conditioner according to zero one embodiment of the present invention;
fig. 3 shows a schematic flow diagram of a buck-boost driving method according to an embodiment of the invention;
FIG. 4 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention;
FIG. 5 shows a timing diagram for a buck-boost driving scheme according to one embodiment of the present invention;
FIG. 6 shows a timing diagram for a buck-boost driving scheme according to another embodiment of the present invention;
FIG. 7 shows a timing diagram for a buck-boost driving scheme according to another embodiment of the present invention;
FIG. 8 shows a timing diagram for a buck-boost driving scheme according to another embodiment of the present invention;
FIG. 9 illustrates a schematic diagram of the operation of the controller for a buck-boost drive scheme according to one embodiment of the present invention;
fig. 10 shows a schematic diagram of the operation of the controller for a buck-boost drive scheme according to another embodiment of the present invention;
fig. 11 shows a schematic diagram of the operation of the controller of the buck-boost driving scheme according to another embodiment of the present 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 11.
As shown in fig. 1, a buck-boost driving circuit 100 according to a first embodiment of the present invention includes: a totem-pole circuit configured to be capable of step-up modulating or rectifying a power supply signal, a step-down circuit having an input connected to an output of the totem-pole circuit, the step-down circuit comprising: a first power tube Q1 and a second power tube Q2 sequentially connected in series between the high voltage output end and the low voltage output end of the totem pole circuit, and two ends of the second power tube Q2 are led out as a high voltage bus and a low voltage bus, wherein the first power tube Q1 is configured to be capable of performing voltage-reduction modulation on the power supply signal, and the first power tube Q1 and the second power tube Q2 are alternately turned on or off.
In the technical scheme, the totem-pole circuit and the voltage-reducing type circuit are arranged, the totem-pole circuit is configured to be capable of performing voltage-increasing modulation or rectification processing on a power supply signal, the voltage-reducing type circuit can perform voltage-reducing modulation on the voltage subjected to rectification processing so as to flexibly adjust the bus voltage, the bus voltage can be higher than the alternating-current voltage peak value, the bus voltage can also be lower than the alternating-current voltage peak value, namely, the bus voltage is increased or reduced according to the load operation requirement so as to improve the motor efficiency.
The alternating current signal AC is connected into the totem-pole circuit, and the totem-pole circuit can perform boosting modulation or rectification processing on the power supply signal and transmit the power supply signal to the next-stage buck circuit.
In addition, the buck 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 totem-pole 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 as to further improve the efficiency of the motor.
In addition, one inductive element is shared between the totem-pole circuit and the buck-type circuit.
In any one of the above technical solutions, preferably, the step-down circuit includes: and the filter circuit is connected with the second power tube Q2 in parallel and is used for filtering power supply signals flowing through the high-voltage bus and the low-voltage bus.
In the technical scheme, the filter circuit is arranged in the step-down circuit, so that the power supply signal can be subjected to step-down modulation, the load efficiency is improved, and meanwhile, the power supply signal can be subjected to filtering processing to reduce the noise signal input to the load.
In any one of the above technical solutions, preferably, the filter circuit includes: a first inductive element L1, a first end of the first inductive element L1 being connected to a common end between the first power transistor Q1 and the second power transistor Q2; a first capacitive element C1, a first end of the first capacitive element C1 is connected to the second end of the first inductive element L1, and a second end of the first capacitive element C1 is connected to the low voltage bus bar.
In the technical scheme, the filter circuit comprises a first inductive element L1 and a first capacitive element C1 to form an LC filter structure, and after the first power tube Q1 and the second power tube Q2 are modulated and reduced in voltage, the filter circuit continues to filter the reduced power supply signal.
In any one of the above technical solutions, preferably, the totem-pole circuit includes: a second inductive element L2, the second inductive element L2 being configured to switch in the supply signal; the power supply circuit comprises a bridge circuit, a power tube is arranged in any bridge arm of the bridge circuit, the input end of the bridge circuit is connected to the inductive element, and the bridge circuit is configured to be capable of rectifying the power supply signal; a second capacitive element C2, the second capacitive element C2 being connected between two output terminals of the bridge circuit.
In this technical solution, the totem-pole circuit includes the second inductive element L2, the bridge circuit, and the second capacitive element C2, and is connected in the above manner, so that, on one hand, the modulation of the bridge circuit can realize the calibration of the power factor, and on the other hand, the modulation and boosting of the bridge circuit are controlled to realize the boosting processing of the power supply signal.
In any one of the above technical solutions, preferably, the power supply terminal is configured to output a power supply signal to the driving circuit 100, and the bridge circuit includes: a third power tube T1, a fourth power tube T2, a fifth power tube T3 and a sixth power tube T4, wherein a common end between the third power tube T1 and the fourth power tube T2 is connected to a first end of the second inductive element L2, a first end of the second inductive element L2 is connected to a second end of the second inductive element L2, and a common end between the fifth power tube T3 and the sixth power tube T4 is connected to a second output end of the power supply, wherein a common end between the third power tube T1 and the fifth power tube T3 serves as the high voltage output end, and a common end between the fourth power tube T2 and the sixth power tube T4 serves as the low voltage output end.
In the technical scheme, the four power tubes are arranged in the bridge circuit, and the controller drives the four power tubes to perform modulation operation, so that the boosting processing of the power supply signal is realized, the load efficiency is improved, and the power consumption of the motor is reduced.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a diode rectification mode, and the method specifically comprises the following steps: the controller controls the power tubes in the bridge circuit to be cut off, and the anti-parallel diodes rectify the power supply signals.
In the technical scheme, the anti-parallel diodes are arranged for no power tube, when the power tube is cut off, the bridge circuit can be equivalent to a rectifier, at the moment, the alternating current signal AC flows to the next-stage circuit through the anti-parallel diodes, at the moment, the boosting modulation processing is not carried out, and the impact of overhigh voltage on the next-stage circuit and the load can be effectively reduced.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a synchronous rectification mode, and the method specifically comprises the following steps: when the anti-parallel diodes are conducted, the controller controls the corresponding power tubes to be conducted at a first duty ratio.
In this embodiment, when the anti-parallel diode is turned on, the controller controls the corresponding power transistor to be turned on at a first duty ratio, for example, when the anti-parallel diode of the third power transistor T1 is turned on, the third power transistor T1 is turned on synchronously, so as to implement synchronous rectification processing on the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a semi-synchronous rectification mode, and the controller specifically comprises the following steps: the third power transistor T1 and the fourth power transistor T2 are controlled to be turned off, when the anti-parallel diode of the fifth power transistor T3 is turned on, the controller controls the fifth power transistor T3 to be turned on, and when the anti-parallel diode of the sixth power transistor T4 is turned on, the controller controls the sixth power transistor T4 to be turned on.
In this technical solution, by controlling the third power transistor T1 and the fourth power transistor T2 to be turned off, when the anti-parallel diode of the fifth power transistor T3 is turned on, the controller controls the fifth power transistor T3 to be turned on, and when the anti-parallel diode of the sixth power transistor T4 is turned on, the controller controls the sixth power transistor T4 to be turned on, that is, the fifth power transistor T3 and the sixth power transistor T4 are half-synchronous rectification, so as to implement half-synchronous rectification on the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a semi-synchronous rectification mode, and the controller specifically comprises the following steps: the fifth power transistor T3 and the sixth power transistor T4 are controlled to be turned off, when the anti-parallel diode of the third power transistor T1 is turned on, the controller controls the third power transistor T1 to be turned on, and when the anti-parallel diode of the fourth power transistor T2 is turned on, the controller controls the fourth power transistor T2 to be turned on.
In this technical solution, by controlling the fifth power tube T3 and the sixth power tube T4 to be turned off, when the anti-parallel diode of the third power tube T1 is turned on, the controller controls the third power tube T1 to be turned on, and when the anti-parallel diode of the fourth power tube T2 is turned on, the controller controls the fourth power tube T2 to be turned on, that is, the fourth power tube T2 and the third power tube T1 are half-synchronous rectification, so as to implement half-synchronous rectification on the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a boost modulation mode, and the method specifically comprises the following steps: controlling the first power tube Q1 to be conducted; when the power supply signal flows into the common terminal between the third power tube T1 and the fourth power tube T2, the third power tube T1 and the fourth power tube T2 are controlled to be alternately turned on at a second duty ratio, when a current flows through an anti-parallel diode of the sixth power tube T4, the controller controls the sixth power tube T4 to be turned on at a third duty ratio, and simultaneously, the controller keeps the fifth power tube T3 turned off.
In this embodiment, when the first power transistor Q1 is turned on, the second power transistor Q2 is controlled to be turned off to avoid a shoot-through phenomenon, and when the power supply signal flows into the common terminal between the third power transistor T1 and the fourth power transistor T2, the third power transistor T1 and the fourth power transistor T2 are controlled to be alternately turned on at the second duty ratio, and when a current flows through an anti-parallel diode of the sixth power transistor T4, the controller controls the sixth power transistor T4 to be turned on at the third duty ratio, and simultaneously, the controller keeps the fifth power transistor T3 turned off to increase the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the power tube, the power tube is provided with anti-parallel diodes, the controller drives the bridge circuit to work in a boost modulation mode, and the method specifically comprises the following steps: controlling the first power tube Q1 to be conducted; when the power supply signal flows into the common terminal between the fifth power tube T3 and the sixth power tube T4, the fifth power tube T3 and the sixth power tube T4 are controlled to be alternately turned on at a fourth duty ratio, when a current flows through an anti-parallel diode of the fourth power tube T2, the controller controls the fourth power tube T2 to be turned on at a fifth duty ratio, and simultaneously, the controller keeps the third power tube T1 turned off.
In this embodiment, when the first power transistor Q1 is turned on, the second power transistor Q2 is controlled to be turned off to avoid a shoot-through phenomenon, and when the power supply signal flows into the common terminal between the fifth power transistor T3 and the sixth power transistor T4, the fifth power transistor T3 and the sixth power transistor T4 are controlled to be alternately turned on at a fourth duty ratio, and when a current flows through an anti-parallel diode of the fourth power transistor T2, the controller controls the fourth power transistor T2 to be turned on at a fifth duty ratio, and simultaneously, the controller keeps the third power transistor T1 turned off to increase the power supply signal.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the switching tube, the second power tube Q2 is provided with an anti-parallel diode, and the controller drives the buck circuit to work in a filtering mode, and the method specifically comprises the following steps: the controller controls the second power tube Q2 to be cut off, and the filter circuit carries out filtering processing on the power supply signal.
In the technical scheme, the second power tube Q2 is controlled to be turned off, the filter circuit performs filtering processing on the power supply signal, and the filtering processing is realized only through an LC structure without performing voltage reduction modulation processing.
In any of the above technical solutions, preferably, the method further includes: the controller is connected to the control end of the switching tube, drives the buck circuit to perform buck modulation, and specifically comprises the following steps: the controller controls the first power tube Q1 to be turned on at a sixth duty cycle, and at the same time, the controller controls the second power tube Q2 and the first power tube Q1 to be alternately turned on or kept off.
In this embodiment, the first power transistor Q1 is controlled to be turned on at a sixth duty ratio, and the controller controls the second power transistor Q2 and the first power transistor Q1 to be alternately turned on or off to perform the step-down modulation on the power supply signal.
As shown in fig. 2, an air conditioner 200 according to an 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. 3, the buck-boost driving method according to the embodiment of the present invention includes: step S302, determining the alternating current voltage input to the voltage reduction type circuit and the bus voltage input to the totem-pole circuit; step S304, controlling the totem-pole circuit to perform voltage boosting modulation, or controlling the voltage-reducing type circuit to perform voltage reducing modulation, or controlling the totem-pole circuit and the voltage-reducing type circuit to alternately modulate power supply signals according to the alternating current voltage and the bus voltage.
In the technical scheme, the totem-pole circuit is controlled to perform boost modulation or the buck circuit is controlled to perform buck modulation or the totem-pole circuit and the buck circuit are controlled to alternately modulate the power supply signal according to the alternating current voltage and the bus voltage, so that the bus voltage can be higher than the peak value of the alternating current voltage, the bus voltage can be lower than the peak value of the alternating current voltage, that is, the bus voltage is increased or reduced according to the load operation requirement, and the motor efficiency is improved.
In any of the above technical solutions, preferably, the controlling the totem-pole circuit to perform voltage boosting modulation, or controlling the buck-type circuit to perform voltage buck modulation, or controlling the totem-pole circuit and the buck-type 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 totem-pole circuit to perform boost modulation on the power supply signal.
In the technical scheme, the voltage-reducing 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 totem-pole circuit is controlled to perform voltage-increasing 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 controlling the totem-pole circuit to perform voltage boosting modulation, the controlling the buck-type circuit to perform voltage buck modulation, or the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage 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 totem-pole circuit is controlled to stop modulation, and the magnitude relation between the bus voltage and the alternating-current 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 totem-pole circuit is controlled to stop modulation, the magnitude relation between the bus voltage and the alternating voltage is compared, and when the bus voltage is detected to be smaller than or equal to the alternating voltage, the voltage reduction type circuit is controlled to perform voltage reduction 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 controlling the totem-pole circuit to perform voltage boosting modulation, the controlling the buck-type circuit to perform voltage buck modulation, or the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage 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 when 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 totem-pole circuit and the buck-type circuit are controlled to alternately modulate a power supply signal.
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 totem-pole circuit and the buck-type circuit are controlled to alternately modulate the power supply signal so as to further improve the motor efficiency.
In any one of the above technical solutions, preferably, the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal further includes: controlling the totem-pole 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 totem-pole 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 totem-pole circuit is controlled to stop modulating, 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 totem-pole 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.
As shown in fig. 4, a computer-readable storage medium 400 is provided, where the computer-readable storage medium 400 stores a computer program, and when the computer program is executed by the air conditioner 200, the steps of the buck-boost driving method defined in any one of the above technical solutions are implemented, where the steps specifically include: determining an alternating current voltage input to the buck circuit and a bus voltage input to the totem-pole circuit; and controlling the totem-pole circuit to perform voltage boosting modulation, or controlling the buck-type circuit to perform voltage reduction modulation, or controlling the totem-pole 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 totem-pole circuit is controlled to perform boost modulation or the buck circuit is controlled to perform buck modulation or the totem-pole circuit and the buck circuit are controlled to alternately modulate the power supply signal according to the alternating current voltage and the bus voltage, so that the bus voltage can be higher than the peak value of the alternating current voltage, the bus voltage can be lower than the peak value of the alternating current voltage, that is, the bus voltage is increased or reduced according to the load operation requirement, and the motor efficiency is improved.
In any of the above technical solutions, preferably, the controlling the totem-pole circuit to perform voltage boosting modulation, or controlling the buck-type circuit to perform voltage buck modulation, or controlling the totem-pole circuit and the buck-type 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 totem-pole circuit to perform boost modulation on the power supply signal.
In the technical scheme, the voltage-reducing 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 totem-pole circuit is controlled to perform voltage-increasing 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 controlling the totem-pole circuit to perform voltage boosting modulation, the controlling the buck-type circuit to perform voltage buck modulation, or the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage 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 totem-pole circuit is controlled to stop modulation, and the magnitude relation between the bus voltage and the alternating-current 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 totem-pole circuit is controlled to stop modulation, the magnitude relation between the bus voltage and the alternating voltage is compared, and when the bus voltage is detected to be smaller than or equal to the alternating voltage, the voltage reduction type circuit is controlled to perform voltage reduction 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 controlling the totem-pole circuit to perform voltage boosting modulation, the controlling the buck-type circuit to perform voltage buck modulation, or the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal according to the ac voltage and the bus voltage 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 when 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 totem-pole circuit and the buck-type circuit are controlled to alternately modulate a power supply signal.
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 totem-pole circuit and the buck-type circuit are controlled to alternately modulate the power supply signal so as to further improve the motor efficiency.
In any one of the above technical solutions, preferably, the controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal further includes: controlling the totem-pole 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 totem-pole 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 totem-pole circuit is controlled to stop modulating, 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 totem-pole 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.
As shown in fig. 1, the driving control circuit includes a totem-pole circuit and a BUCK circuit, the BUCK circuit is an embodiment of the BUCK circuit, an output of the totem-pole circuit is directly connected to an input of the BUCK circuit, an input of the totem-pole circuit is connected to a single-phase ac power supply, and an output of the BUCK 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 totem-pole circuit comprises a second inductive element L2, 4 bidirectional conduction power switch tubes, namely a third power tube T1, a fourth power tube T2, a fifth power tube T3 and a sixth power tube T4, and the 4 bidirectional conduction power switch tubes form a bridge circuit.
One end of the second inductive element L2 is connected with one end of an alternating current power supply, the other end of the second inductive element L2 is connected with the middle connection point of one side of the bridge arm of the bridge circuit, the other end of the alternating current power supply is connected with the middle connection point of the other side of the bridge arm of the bridge circuit, and the high-voltage output end and the low-voltage output end of the bridge circuit are respectively connected with the anode and the cathode of the second capacitive element C2 to form direct current output of the totem pole circuit.
Wherein, the fourth power transistor T2 and the sixth power transistor T4 may be replaced by diodes.
The first power tube Q1 of the BUCK circuit is a reverse blocking type power switch tube, the second power tube Q2 is a bidirectional conducting power switch tube, the first inductive element L1 and the first capacitive element C1 are arranged, the drain of the reverse blocking type power switch tube is connected to the high-voltage end of the direct current input, the source of the reverse blocking type power switch tube is connected to the drain of the bidirectional conducting power switch tube and one end of the first inductive element L1, the first inductive element L1 is connected to the positive electrode of the first capacitive element C1 to form an LC filter circuit, and the source of the bidirectional conducting power switch tube is connected to the low-voltage end of the direct current input and the negative electrode of the first capacitive element C1.
Wherein, the second power tube Q2 can be replaced by a diode.
As shown in fig. 5 and 6, the step-down control is implemented by the modulation control of the first power transistor Q1 and the second power transistor Q2, the step-up control is implemented by the modulation control of the third power transistor T1 and the fifth power transistor T3, and the fourth power transistor T2 and the sixth power transistor T4 are used for rectification.
The operation process of the PI controller is shown in fig. 10, where Vout is an output bus voltage value, Vac is an input ac voltage, Vin is an absolute value of the input voltage Vac, Boost Duty is a Duty ratio of a totem-pole circuit, and Duty is a Duty ratio of a buck-type circuit.
During the buck-boost control, the first power transistor Q1 performs PWM output at a certain duty ratio, and the output of the second power transistor Q2 is opposite to the output of the first power transistor Q1 (when the first power transistor Q1 is at a high level, the second power transistor Q2 is at a low level, and when the first power transistor Q1 is at a low level, the second power transistor Q2 is at a high level).
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 shown in equation 1-1:
Figure RE-GDA0002463346470000171
when the duty ratio is 1, the first power tube Q1 is in a Boost region and in a full-range conduction state, and when the duty ratio is less than 1, the first power tube Q1 is in a Buck modulation region and in a PWM modulation output state.
As shown in fig. 8, during Buck control, the third power transistor T1, the fourth power transistor T2, the fifth power transistor T3, and the sixth power transistor T4 are rectifying.
The third power tube T1 performs synchronous on-off output according to the state of the input voltage Vac, the output of the sixth power tube T4 is the same as the output of the third power tube T1, and the outputs of the fourth power tube T2 and the fifth power tube T3 are opposite to the output of the third power tube T1. The output of the third power tube T1 is shown in equation 1-2.
Figure RE-GDA0002463346470000172
During Boost control, the third power tube T1 and the fifth power tube T3 perform PWM output at a certain duty ratio in different periods according to the state of the input voltage Vac.
Ideally, the duty ratios output from the third power transistor T1 and the fifth power transistor T3 are shown in equations 1-3 and 1-4.
Figure RE-GDA0002463346470000173
Figure RE-GDA0002463346470000174
The fourth power transistor T2 and the sixth power transistor T4 are for rectification.
The fourth power transistor T2 is turned on/off according to the state of the input voltage Vac, and the output of the sixth power transistor T4 is opposite to the output of the fourth power transistor T2.
The output of the fourth power transistor T2 is shown in equations 1-5.
Figure RE-GDA0002463346470000175
The voltage reduction control is realized by the modulation control of a first power tube Q1 and a second power tube Q2, the voltage boosting control is realized by the modulation control of a fourth power tube T2 and a sixth power tube T4, and a third power tube T1 and a fifth power tube T3 are used for rectification.
During the buck-boost control, the first power transistor Q1 performs PWM output with a certain duty ratio, and the output of the second power transistor Q2 is opposite to the output of the first power transistor Q1, for example, when the first power transistor Q1 is at a high level, the second power transistor Q2 is at a low level, and when the first power transistor Q1 is at a low level, the second power transistor Q2 is at a high level.
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 shown in equation 2-1:
Figure RE-GDA0002463346470000181
when the duty ratio is 1, the first power tube Q1 is in a Boost region and in a full-range conduction state, and when the duty ratio is less than 1, the first power tube Q1 is in a Buck modulation region and in a PWM modulation output state.
During Buck control, the third power tube T1, the fourth power tube T2, the fifth power tube T3 and the sixth power tube T4 are used for rectification.
The third power tube T1 performs synchronous on-off output according to the state of the input voltage Vac, the output of the sixth power tube T4 is the same as the output of the third power tube T1, and the outputs of the fourth power tube T2 and the fifth power tube T3 are opposite to the output of the third power tube T1.
The output of the third power transistor T1 is shown in equation 2-2.
Figure RE-GDA0002463346470000182
As shown in fig. 7, during Boost control, the fourth power transistor T2 and the sixth power transistor T4 perform PWM output at a certain duty ratio in different time intervals according to the state of the input voltage Vac.
Ideally, the duty ratios output from the fourth power transistor T2 and the sixth power transistor T4 are shown in equations 2-3 and 2-4.
Figure RE-GDA0002463346470000183
Figure RE-GDA0002463346470000184
The third power transistor T1 and the fifth power transistor T3 are for rectification.
The third power transistor T1 is turned on/off to output according to the state of the input voltage Vac, and the output of the fifth power transistor T3 is opposite to the output of the third power transistor T1.
The output of the third power transistor T1 is shown in equation 2-5.
Figure RE-GDA0002463346470000185
When the bus voltage value Vout is within the peak value of the input voltage Vin, the system has a Buck Buck modulation area and a Boost modulation area, and when the bus voltage value Vout is higher than the peak value of the input voltage Vin, the system is in the 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.
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 Vcmd is lower than Vin, the system is in a Boost modulation mode, and the specific Boost modulation driving is as shown in fig. 9.
When Vcmd is higher than Vin, the system is in Buck Buck modulation mode, and Buck modulation driving is shown in FIG. 10.
As shown in fig. 9 and 10, the duty ratio output is realized by a controller (PI controller is shown as an example) so that the actual bus voltage Vout approaches the voltage specified 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.
And at the moment when the Buck mode is switched to the Boost mode, updating a complementary value (1-Dbuck) of the output duty ratio in the Buck mode into the controller as a Boost mode initial quantity (such as an integration initial value in a PI controller), and at the moment when the Buck mode is switched to the Buck mode, updating the complementary value (1-Dboost) of the output duty ratio in the Boost mode into the controller as the Buck mode initial quantity (such as an integration initial value in the PI controller). The method can also realize the modulation stability during switching.
The technical scheme of the invention is described in detail in the above with reference to the accompanying drawings, and the invention provides a voltage boosting and reducing 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 program instructions associated with hardware, and the program may be stored in a computer-readable storage medium, which 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 (20)

1. A buck-boost driver circuit, comprising:
a totem-pole circuit configured to be capable of boost modulating or rectifying a supply signal,
a buck-type circuit, an input of the buck-type circuit connected to an output of the totem-pole circuit, the buck-type circuit comprising:
a first power tube and a second power tube which are sequentially connected in series between the high-voltage output end and the low-voltage output end of the totem-pole circuit, wherein a high-voltage bus and a low-voltage bus are led out from two ends of the second power tube,
wherein the first power tube is configured to perform buck modulation on the power supply signal, and the first power tube and the second power tube are alternately turned on or kept off.
2. The buck-boost driver circuit of claim 1, wherein the buck-type circuit comprises:
and the filter circuit is connected with the second power tube in parallel and is used for filtering power supply signals flowing through the high-voltage bus and the low-voltage bus.
3. The buck-boost driver circuit of claim 2, wherein the filter circuit comprises:
a first inductive element, a first end of the first inductive element is connected to a common end between the first power tube and the second power tube;
a first capacitive element, a first end of the first capacitive element being connected to the second end of the first inductive element, a second end of the first capacitive element being connected to the low voltage bus.
4. The buck-boost driver circuit of claim 1, wherein the totem-pole circuit comprises:
a second inductive element configured to switch in the supply signal;
the power supply circuit comprises a bridge circuit, a power tube is arranged in any bridge arm of the bridge circuit, the input end of the bridge circuit is connected to the inductive element, and the bridge circuit is configured to be capable of rectifying the power supply signal;
a second capacitive element connected between two output terminals of the bridge circuit.
5. The buck-boost driver circuit of claim 4, wherein a supply terminal is configured to output a supply signal to the driver circuit, the bridge circuit comprising:
a third power tube, a fourth power tube, a fifth power tube and a sixth power tube, wherein a common terminal between the third power tube and the fourth power tube is connected to the first terminal of the second inductive element, the first terminal of the power supply terminal is connected to the second terminal of the second inductive element, and a common terminal between the fifth power tube and the sixth power tube is connected to the second output terminal of the power supply terminal,
and the common end of the third power tube and the fifth power tube is used as the high-voltage output end, and the common end of the fourth power tube and the sixth power tube is used as the low-voltage output end.
6. The buck-boost driver circuit according to claim 4, further comprising:
the controller is connected to the control end of the power tubes, the power tubes are provided with anti-parallel diodes,
the controller drives the bridge circuit to work in a diode rectification mode, and the method specifically comprises the following steps:
the controller controls the power tubes in the bridge circuit to be cut off, and the anti-parallel diodes rectify the power supply signals.
7. The buck-boost driver circuit according to claim 5, further comprising:
the controller is connected to the control end of the power tubes, the power tubes are provided with anti-parallel diodes,
the controller drives the bridge circuit to work in a synchronous rectification mode, and the method specifically comprises the following steps:
when the anti-parallel diodes are conducted, the controller controls the corresponding power tubes to be conducted at a first duty ratio.
8. The buck-boost driver circuit according to claim 5, further comprising:
the controller is connected to the control end of the power tubes, the power tubes are provided with anti-parallel diodes,
the controller drives the bridge circuit to work in a semi-synchronous rectification mode, and the method specifically comprises the following steps:
and controlling the third power tube and the fourth power tube to be cut off, controlling the fifth power tube to be switched on by the controller when the anti-parallel diode of the fifth power tube is switched on, and controlling the sixth power tube to be switched on by the controller when the anti-parallel diode of the sixth power tube is switched on.
9. The buck-boost driver circuit according to claim 5, further comprising:
the controller is connected to the control end of the power tubes, the power tubes are provided with anti-parallel diodes,
the controller drives the bridge circuit to work in a semi-synchronous rectification mode, and the method specifically comprises the following steps:
and controlling the fifth power tube and the sixth power tube to be cut off, when the anti-parallel diode of the third power tube is switched on, the controller controls the third power tube to be switched on, and when the anti-parallel diode of the fourth power tube is switched on, the controller controls the fourth power tube to be switched on.
10. The buck-boost driver circuit according to claim 5, further comprising:
the controller is connected to the control end of the power tubes, the power tubes are provided with anti-parallel diodes,
the controller drives the bridge circuit to work in a boost modulation mode, and specifically comprises the following steps:
controlling the first power tube to be conducted;
when the power supply signal flows into a common end between the third power tube and the fourth power tube, the third power tube and the fourth power tube are controlled to be alternately conducted at a second duty ratio, when current flows through an anti-parallel diode of the sixth power tube, the controller controls the sixth power tube to be conducted at a third duty ratio, and meanwhile, the controller keeps the fifth power tube to be stopped.
11. The buck-boost driver circuit according to claim 5, further comprising:
the controller is connected to the control end of the power tubes, the power tubes are provided with anti-parallel diodes,
the controller drives the bridge circuit to work in a boost modulation mode, and specifically comprises the following steps:
controlling the first power tube to be conducted;
when the power supply signal flows into a common end between the fifth power tube and the sixth power tube, the fifth power tube and the sixth power tube are controlled to be alternately conducted at a fourth duty ratio, when current flows through an anti-parallel diode of the fourth power tube, the controller controls the fourth power tube to be conducted at the fifth duty ratio, and meanwhile, the controller keeps the third power tube to be stopped.
12. The buck-boost driver circuit according to claim 1, further comprising:
the controller is connected to the control end of the switch tube, the second power tube is provided with an anti-parallel diode,
the controller drives the buck circuit to work in a filtering mode, and the method specifically comprises the following steps:
the controller controls the second power tube to be cut off, and the filter circuit carries out filtering processing on the power supply signal.
13. The buck-boost driver circuit according to any one of claims 1 to 10, further comprising:
the controller is connected to the control end of the switching tube, drives the buck circuit to perform buck modulation, and specifically comprises the following steps:
the controller controls the first power tube to be conducted at a sixth duty ratio, and simultaneously, the controller controls the second power tube and the first power tube to be conducted or kept off alternately.
14. An air conditioner, comprising:
a motor;
the buck-boost drive circuit of any one of claims 1 to 13, the drive circuit configured to control operation of the motor.
15. A buck-boost driving method applied to the driving circuit according to any one of claims 1 to 14, wherein the driving circuit comprises a buck-type circuit and a totem-pole 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 totem-pole circuit;
and controlling the totem-pole circuit to perform voltage boosting modulation, or controlling the buck-type circuit to perform voltage reduction modulation, or controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal according to the alternating-current voltage and the bus voltage.
16. The buck-boost driving method according to claim 15, wherein the controlling the totem-pole circuit to perform boost modulation, or controlling the buck-type circuit to perform buck modulation, or controlling the totem-pole circuit and the buck-type 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 totem-pole circuit to perform boost modulation on the power supply signal.
17. The buck-boost driving method according to claim 15, wherein the totem-pole circuit is controlled to perform boost modulation, the buck-type circuit is controlled to perform buck modulation, or the totem-pole circuit and the buck-type circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and 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 totem-pole circuit is controlled to stop modulation, and the magnitude relation between the bus voltage and the alternating-current 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.
18. The buck-boost driving method according to claim 15, wherein the totem-pole circuit is controlled to perform boost modulation, the buck-type circuit is controlled to perform buck modulation, or the totem-pole circuit and the buck-type circuit are controlled to alternately modulate a power supply signal according to the ac voltage and the bus voltage, and 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 when 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 totem-pole circuit and the buck-type circuit are controlled to alternately modulate a power supply signal.
19. The buck-boost driving method according to claim 15, wherein controlling the totem-pole circuit and the buck-type circuit to alternately modulate a power supply signal further comprises:
controlling the totem-pole 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 totem-pole 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.
20. 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 19.
CN202010188769.6A 2020-03-17 2020-03-17 Buck-boost driving circuit, air conditioner, method and computer-readable storage medium Active CN111245262B (en)

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