CN111224564A - Buck-boost driving circuit, method, air conditioner and computer readable storage medium - Google Patents

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

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Publication number
CN111224564A
CN111224564A CN202010188837.9A CN202010188837A CN111224564A CN 111224564 A CN111224564 A CN 111224564A CN 202010188837 A CN202010188837 A CN 202010188837A CN 111224564 A CN111224564 A CN 111224564A
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China
Prior art keywords
voltage
tube
circuit
boost
buck
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Granted
Application number
CN202010188837.9A
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Chinese (zh)
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CN111224564B (en
Inventor
黄招彬
赵鸣
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 CN202010188837.9A priority Critical patent/CN111224564B/en
Publication of CN111224564A publication Critical patent/CN111224564A/en
Priority to PCT/CN2020/142006 priority patent/WO2021184921A1/en
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Publication of CN111224564B publication Critical patent/CN111224564B/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • 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
    • 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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/066—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode particular circuits having a special characteristic
    • 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
    • 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
    • H02M7/219—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 in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H02P25/024—Synchronous motors controlled by supply frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a buck-boost driving circuit, a method, an air conditioner and a readable storage medium, wherein the driving circuit comprises: a buck circuit, the buck circuit comprising: the power supply circuit comprises a bridge circuit, a voltage reduction type circuit and a power supply circuit, wherein a semiconductor tube is arranged in any bridge arm of the bridge circuit, and the voltage reduction type circuit is configured to be connected with a power supply signal input by a power supply end; a boost circuit, an input of the boost circuit connected to an output of the buck circuit, the boost circuit configured to boost the supply signal; and the first power tube is connected to two output ends of the bridge circuit and two input ends of the boost type circuit, and the first power tube is configured to freewheel the boost type circuit. Through the technical scheme provided by the invention, the direct current bus voltage of the variable frequency motor can be flexibly and reliably regulated, and the direct current bus voltage can be higher than the peak value of the input alternating current voltage and lower than the peak value of the input alternating current voltage, so that the iron loss of the motor can be reduced, and the efficiency of the variable frequency motor can be improved.

Description

Buck-boost driving circuit, method, air conditioner and computer readable storage medium
Technical Field
The invention relates to the technical field of motors, 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, the first aspect of the present invention provides a buck-boost driving circuit.
The second aspect of the present invention provides a buck-boost driving method.
A third aspect of the present invention provides an air conditioner.
A fourth aspect of the present invention is directed to a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides a buck-boost driving circuit, including: a buck circuit, the buck circuit comprising: the power supply circuit comprises a bridge circuit, a voltage reduction type circuit and a power supply circuit, wherein a semiconductor tube is arranged in any bridge arm of the bridge circuit, and the voltage reduction type circuit is configured to be connected with a power supply signal input by a power supply end; the input end of the boost type circuit is connected to the output end of the buck type circuit, and the boost type circuit is configured to be capable of boosting the power supply signal; and the first power tube is connected to two output ends of the bridge circuit and two input ends of the boost type circuit, and the first power tube is configured to freewheel the boost type circuit.
In the technical scheme, the buck-boost circuit and the boost-boost circuit are arranged in the driving circuit, so that the buck-boost regulation of the bus voltage is realized, the bus voltage can be higher than the peak value of the alternating-current voltage, the bus voltage can also be lower than the peak value of the alternating-current voltage, the efficiency and the reliability of the motor are improved, and particularly for a permanent magnet synchronous motor, the iron loss of the motor can be reduced by reducing the bus voltage.
The power supply signal generally refers to a signal flowing through the driving circuit and driving a load to operate, and an input signal of the bridge circuit is an alternating current signal and an output signal is a bus direct current signal. Therefore, alternating current and alternating voltage are collected at the input end of the bridge circuit, and direct current and direct bus voltage are collected at the output end of the bridge circuit.
Specifically, a plurality of semiconductor switches are arranged in the buck circuit and the boost circuit, the semiconductor switches are controlled by a controller, and the controller modulates the working state of the semiconductor switches according to at least one signal of the collected alternating voltage, the collected alternating current, the collected direct current bus voltage and the collected direct current bus current, so as to adjust the working state of the buck circuit and/or the boost circuit.
In addition, the buck-boost driving circuit in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, further, the bridge circuit includes: the boost circuit comprises a first unidirectional conduction tube, a second power tube, a second unidirectional conduction tube and a third power tube, wherein a common end between the first unidirectional conduction tube and the second power tube is connected to a first output end of a power supply end, a common end between the second unidirectional conduction tube and the third power tube is connected to a second output end of the power supply end, the common end between the first unidirectional conduction tube and the second unidirectional conduction tube is used as a high-voltage output end of the bridge circuit, the common end between the second power tube and the third power tube is used as a low-voltage output end of the bridge circuit, the first unidirectional conduction tube and the second unidirectional conduction tube are both cut off, and the first power tube carries out follow current on the boost circuit.
In this technical scheme, the bridge circuit is specifically configured to include the four power transistors, and the four power transistors are connected in the above manner, so that an ac signal can be rectified, and in addition, a switching device is provided at an output end of the bridge circuit, when the switching device is turned on, a rectified dc signal cannot be transmitted to a boost circuit of a next stage, and when the switching device is turned off, a dc signal output by the bridge circuit is transmitted to the boost circuit, so that modulation and boosting can be continuously performed by the boost circuit.
The first unidirectional conduction tube T1 and the second unidirectional conduction tube T3 chop the power supply signal to perform voltage reduction modulation on the bus voltage.
In any of the above technical solutions, further, the method further includes: the controller is connected to the control end of the power tube, the second power tube is provided with first diodes which are connected in an anti-parallel mode, the third power tube is provided with second diodes which are connected in an anti-parallel mode, 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 second power tube and the third power tube to be both cut off, the first diode and the second diode rectify the power supply signal, wherein the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the first unidirectional conduction tube is conducted, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, and the second unidirectional conduction tube is conducted.
In the technical scheme, when the controller drives the bridge circuit to rectify, the second power tube and the third power tube are controlled to be both turned off, and the first diode and the second diode rectify the power supply signal, wherein a drain voltage of the first unidirectional conduction tube is higher than a source voltage, the first unidirectional conduction tube is turned on, a drain voltage of the second unidirectional conduction tube is higher than the source voltage, and the second unidirectional conduction tube is turned on.
In addition, in the above rectification process, the conduction directions of the first unidirectional conduction tube and the first diode are the same, and the conduction directions of the second unidirectional conduction tube and the second diode are the same, and in consideration of the unidirectional conduction function, both the first unidirectional conduction tube and the second power tube can be replaced by diodes.
In any of the above technical solutions, further, the method further includes: the controller, the controller is connected to the control end of power tube, the second power tube is equipped with anti-parallel first diode, the third power tube all is equipped with anti-parallel second diode, the controller drive bridge circuit works with synchronous rectification mode, specifically includes: the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the first unidirectional conduction tube is conducted, meanwhile, the third power tube is conducted, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, the second unidirectional conduction tube is conducted, and meanwhile, the second power tube is conducted.
In the technical scheme, the bridge circuit is driven by the controller to work in a synchronous rectification mode, the drain voltage of the first one-way conduction tube is higher than the source voltage, the first one-way conduction tube is conducted, meanwhile, the third power tube is conducted, at the moment, the power supply signal is output through the first one-way conduction tube and the third power tube, the response time is short, and the reliability is high.
Similarly, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, the second unidirectional conduction tube is conducted, and meanwhile, the second power tube is conducted, so that a power supply signal is output through the second power tube and the second unidirectional conduction tube, the response time is short, and the reliability is high.
In any of the above technical solutions, further, the method further includes: the controller, the controller is connected to the control end of power tube, the second power tube is equipped with anti-parallel first diode, the third power tube all is equipped with anti-parallel second diode, the controller drive bridge circuit works with diode rectification step-down mode, specifically includes: the controller controls the second power tube and the third power tube to be cut off, and the first diode and the second diode rectify the power supply signal; the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the controller triggers the first unidirectional conduction tube to be switched on or switched off according to a first duty ratio, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, and the controller triggers the second unidirectional conduction tube to be switched on or switched off according to a second duty ratio.
In the technical scheme, the controller drives the bridge circuit to work in a diode rectification step-down mode, when diode rectification is performed, the controller controls the second power tube and the third power tube to be both stopped, the first diode and the second diode rectify the power supply signal, the drain voltage of the first one-way conduction tube is higher than the source voltage, the controller triggers the first one-way conduction tube to be conducted or stopped according to a first duty ratio, the drain voltage of the second one-way conduction tube is higher than the source voltage, and the controller triggers the second one-way conduction tube to be conducted or stopped according to a second duty ratio.
The first unidirectional conduction tube and the second unidirectional conduction tube sequentially work in two half periods of alternating voltage, and in order to improve the reliability of the power device, a dead time is set in a switching period between the first unidirectional conduction tube and the second unidirectional conduction tube.
In addition, when the alternating voltage is higher than the given value of the direct current bus voltage, the controller can trigger the switching device to perform buck modulation at a specified duty ratio, and meanwhile, the boost type circuit works in a filtering mode without performing boost modulation so as to improve the efficiency of the driving circuit.
In any of the above technical solutions, further, the method further includes: the controller, the controller is connected to the control end of power tube, the second power tube is equipped with anti-parallel first diode, the third power tube all is equipped with anti-parallel second diode, the controller drive bridge circuit specifically includes with synchronous rectification step-down mode work: the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the third power tube is conducted, meanwhile, the controller controls the first unidirectional conduction tube to be conducted or cut off according to a third duty ratio, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, the second power tube is conducted, and meanwhile, the controller controls the second unidirectional conduction tube to be conducted or cut off according to a fourth duty ratio.
In the technical scheme, the controller drives the bridge circuit to work in a synchronous rectification step-down mode, the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the third power tube is conducted, meanwhile, the controller controls the first unidirectional conduction tube to be conducted or cut off according to a third duty ratio, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, the second power tube is conducted, and meanwhile, the controller controls the second unidirectional conduction tube to be conducted or cut off according to a fourth duty ratio.
And in the second half period of the alternating voltage, when the absolute value of the alternating voltage is detected to be higher than the given value of the direct current bus voltage, the second power tube is conducted, and the second unidirectional conduction tube starts modulation.
In addition, the first unidirectional conduction tube and the second unidirectional conduction tube work in two half periods of the alternating-current voltage in sequence, and in order to improve the reliability of the power device, a dead time is set in a switching period between the first unidirectional conduction tube and the second unidirectional conduction tube.
In addition, the second power tube and the third power tube work in two half periods of the alternating voltage in sequence, and in order to improve the reliability of the power device, a dead time is set in a switching period between the second power tube and the third power tube.
In any of the above technical solutions, further, the method further includes: one power tube of the first unidirectional conduction tube and the third power tube is a reverse blocking switch tube or an insulated gate transistor, and the other power tube of the first unidirectional conduction tube and the third power tube is an uncontrolled diode or a metal oxide semiconductor tube; and one of the second power tube and the second unidirectional conduction tube is a reverse blocking switch tube or an insulated gate transistor, and the other of the second power tube and the second unidirectional conduction tube is an uncontrolled diode or a metal oxide semiconductor tube.
In the technical scheme, one of the second power tube and the third power tube can be a reverse blocking switch tube or an insulated gate transistor which can modulate work, and the other one is an uncontrolled diode or a metal oxide semiconductor tube, so that the power consumption and the reliability of the driving circuit can be reduced.
In any of the above technical solutions, further, the reverse blocking switch tube 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, further, 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 P-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, further, 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, further, the boost type circuit includes: the first end of the inductive element is connected to the high-voltage output end of the bridge circuit; the fourth power tube is connected between the second end of the inductive element and the low-voltage output end of the bridge circuit; a fifth power transistor, connected between the second end of the inductive element and the first end of the capacitive element, where the second end of the capacitive element is connected to the low-voltage output terminal, and a controller, where the controller is connected to the control terminal of the fourth power transistor and the control terminal of the fifth power transistor, and the controller controls the boost circuit to operate in a boost mode, specifically including: and the controller determines a fifth duty ratio according to a given voltage value corresponding to the bus voltage between the high-voltage output end and the low-voltage output end and the bus voltage, controls the fourth power tube to be switched on or switched off according to the fifth duty ratio, and alternately switches on or switches off the fifth power tube and the fourth power tube.
In the technical scheme, a boost circuit is arranged to include an inductive element, a fourth power tube and a fifth power tube, wherein the controller determines a fifth duty ratio according to a given voltage value corresponding to a bus voltage between the high-voltage output end and the low-voltage output end and the bus voltage, the controller controls the fourth power tube to be turned on or off according to the fifth duty ratio, and at the moment, the boost circuit performs boost modulation on the bus direct-current voltage to meet the operation requirement and reliability of a load.
In any of the above technical solutions, further, the boost type circuit includes: the first end of the inductive element is connected to the high-voltage output end of the bridge circuit; the fourth power tube is connected between the second end of the inductive element and the low-voltage output end of the bridge circuit; a fifth power transistor, connected between the second end of the inductive element and the first end of the capacitive element, where the second end of the capacitive element is connected to the low-voltage output terminal, and a controller, where the controller is connected to the control terminal of the fourth power transistor and the control terminal of the fifth power transistor, and the controller controls the boost circuit to operate in a filtering mode, specifically including: the controller controls the fifth power tube to be switched on, and the controller controls the fourth power tube to be switched off.
In the technical scheme, the boost circuit is arranged to include an inductive element, a fourth power tube and a fifth power tube, wherein the controller controls the fifth power tube to be turned on, the controller controls the fourth power tube to be turned off, and at this time, the boost circuit performs through filtering on the bus direct-current voltage to reduce ripple noise in the driving circuit.
A second aspect of the present invention provides a buck-boost driving method, including: determining an alternating current voltage input to the driving circuit and a bus voltage of the driving circuit; and controlling the step-down circuit to work in a rectification mode or a step-down mode and controlling the step-up circuit to work in a step-up mode or a filtering mode according to the alternating voltage and the bus voltage.
According to the technical scheme, the step-down circuit and the step-up circuit are arranged in the driving circuit, the step-down regulation of the bus voltage is realized by controlling the step-down circuit to work in a rectification mode or a step-down mode and controlling the step-up circuit to work in a step-up mode or a filtering mode according to the alternating current voltage and 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, the motor efficiency and reliability are improved, and particularly for a permanent magnet synchronous motor, the iron loss of the motor can be reduced by reducing the bus voltage.
The power supply signal generally refers to a signal flowing through the driving circuit and driving a load to operate, and an input signal of the bridge circuit is an alternating current signal and an output signal is a bus direct current signal. Therefore, alternating current and alternating voltage are collected at the input end of the bridge circuit, and direct current and direct bus voltage are collected at the output end of the bridge circuit.
Specifically, a plurality of semiconductor switches are arranged in the buck circuit and the boost circuit, the semiconductor switches are controlled by a controller, and the controller modulates the working state of the semiconductor switches according to at least one signal of the collected alternating voltage, the collected alternating current, the collected direct current bus voltage and the collected direct current bus current, so as to adjust the working state of the buck circuit and/or the boost circuit.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit to operate in a rectification mode or a buck mode, and controlling the boost circuit to operate in a boost mode or a filter mode specifically includes: determining a voltage set point for the bus voltage; comparing the magnitude relation between the voltage given value and the alternating voltage; and controlling the step-down circuit to work in a rectification mode or a step-down mode and controlling the step-up circuit to work in a step-up mode or a filtering mode according to the magnitude relation between the voltage given value and the alternating voltage.
In this technical solution, the step-down circuit is further controlled to operate in a rectifying mode or a buck mode and the step-up circuit is controlled to operate in a boost mode or a filter mode according to a magnitude relationship between the voltage given value and the ac voltage, in order to improve a working efficiency of the driving circuit, when the step-down circuit operates in the buck mode, the step-up circuit operates in the filter mode, or when the step-up circuit operates in the boost mode, the step-down circuit operates in the rectifying mode, and in addition, the step-down circuit operates in the rectifying mode, and at the same time, the step-up circuit may operate in the filter mode.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit to operate in a rectification mode or a buck mode, and controlling the boost circuit to operate in a boost mode or a filter mode specifically includes: determining the product between the effective value of the alternating voltage and a first voltage coefficient, and recording the product as a first voltage sampling value; when the first voltage sampling value is detected to be larger than or equal to the given voltage value corresponding to the bus voltage, the voltage reduction type circuit is controlled to work in the voltage reduction mode, and the voltage boost type circuit is controlled to work in the filtering mode; and when the first voltage sampling value is detected to be smaller than the voltage given value corresponding to the bus voltage, controlling the voltage reduction type circuit to work in the rectification mode, and controlling the voltage boost type circuit to work in the filtering mode.
In the technical scheme, the instantaneous value of the alternating voltage can be determined by determining the product between the effective value of the alternating voltage and the first voltage coefficient and recording the product as the first voltage sampling value, and the voltage-uncontrolled mode is entered when the absolute value of the instantaneous alternating voltage is smaller than the given voltage of the direct-current bus, so that voltage reduction processing is not needed, the power consumption of the driving circuit is reduced by entering the uncontrolled mode at the moment, otherwise, the voltage-reduced control mode is entered, the alternating voltage is reduced in time, and the impact of the alternating voltage on the rear-stage circuit of the voltage-reduced circuit is reduced.
In the voltage non-control mode, the voltage reduction type circuit works in a diode rectification or synchronous rectification state, and the voltage boost type circuit works in a through filtering state.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit to operate in a rectification mode or a buck mode, and controlling the boost circuit to operate in a boost mode or a filter mode specifically includes: determining the product between the effective value of the alternating voltage and a first voltage coefficient, and recording the product as a first voltage sampling value; determining the product between the effective value of the alternating voltage and a second voltage coefficient, and recording the product as a second voltage sampling value; detecting that the first voltage sampling value is smaller than a voltage given value corresponding to the bus voltage, and detecting that the second voltage sampling value is larger than or equal to the voltage given value corresponding to the bus voltage, and detecting an instantaneous value of the alternating voltage; when the instantaneous value of the alternating voltage is detected to be smaller than the given voltage value corresponding to the bus voltage, the step-up circuit is controlled to work in the step-up mode, and the step-down circuit is controlled to work in the rectification mode; and when the instantaneous value of the alternating voltage is detected to be larger than or equal to the voltage given value corresponding to the bus voltage, controlling the voltage reduction type circuit to work in a voltage reduction mode, and controlling the voltage boost type circuit to work in a filtering mode.
In the technical scheme, a first voltage sampling value is smaller than a second voltage sampling value, and if the first voltage sampling value is detected to be smaller than a voltage set value corresponding to the bus voltage and the second voltage sampling value is detected to be larger than or equal to the voltage set value corresponding to the bus voltage, the rising trend of the alternating current voltage is continuously predicted and detected, so that the instantaneous value of the alternating current voltage is continuously detected.
Further, if the instantaneous value of the alternating voltage is detected to be larger than or equal to the voltage given value corresponding to the bus voltage, the step-down circuit is controlled to work in a step-down mode, the alternating voltage is timely reduced, and in addition, the step-up circuit is controlled to work in a filtering mode, so that the efficiency of the driving circuit is improved.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit to operate in a rectification mode or a buck mode, and controlling the boost circuit to operate in a boost mode or a filter mode specifically includes: determining the product between the effective value of the alternating voltage and a second voltage coefficient, and recording the product as a second voltage sampling value; and controlling the boost type circuit to work in a boost mode when the second voltage sampling value is detected to be smaller than the given voltage value corresponding to the bus voltage.
In the technical scheme, when the second voltage sampling value is detected to be smaller than the given voltage value corresponding to the bus voltage, the boost circuit is controlled to work in a boost mode, namely, the possibility of the drop of the direct-current bus voltage and the motor halt are reduced by timely boosting.
In the boost mode, the buck circuit works in a rectification state, and simultaneously, the boost circuit works in a boost modulation state.
In any one of the above technical solutions, further, the motor is a permanent magnet synchronous motor, and the driving method further includes: determining the rotating speed and the back electromotive force coefficient of the permanent magnet synchronous motor; and determining a voltage given value corresponding to the bus voltage according to the rotating speed and the back electromotive force coefficient.
In the technical scheme, the voltage given value corresponding to the bus voltage is determined through the back electromotive force coefficient, so that the reliability and flexibility of the voltage boosting and reducing regulation of the direct current bus voltage are further improved.
In any of the above technical solutions, further, the rectification mode includes a diode rectification mode and a synchronous rectification mode.
A third aspect of the present invention provides an air conditioner comprising: a motor; the buck-boost driving circuit as defined in any one of the above claims, the driving circuit configured to control operation of the motor.
In this technical solution, the air conditioner includes the buck-boost driving circuit in any one of the above technical solutions, and therefore, the air conditioner includes all the beneficial effects of the buck-boost driving circuit in any one of the above technical solutions, and therefore details are not described again.
A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed, implements the driving method defined in any one of the above-mentioned claims.
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 block diagram of a buck-boost driver circuit according to an embodiment of the invention;
fig. 2 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 3 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 4 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 5 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 6 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 7 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 8 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 9 shows a block diagram of a buck-boost driver circuit according to an embodiment of the invention;
fig. 10 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 11 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 12 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 13 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 14 shows a block diagram of a buck-boost driver circuit according to another embodiment of the invention;
fig. 15 shows a timing diagram of a buck-boost driving method according to an embodiment of the invention;
fig. 16 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 17 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 18 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 19 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 20 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 21 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 22 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 23 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 24 shows a timing diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 25 shows a schematic flow diagram of a buck-boost driving method according to another embodiment of the invention;
fig. 26 shows a schematic block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 27 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention.
The correspondence between reference numerals and structures in the above drawings is as follows:
the power supply comprises an alternating current signal AC, a first unidirectional conduction tube T1, a second power tube T2, a second unidirectional conduction tube T3, a third power tube T4, a switching device Q5, a fourth power tube Q3, a fifth power tube Q2, a load M, an inverter IPM, a voltage reduction type circuit 100, a voltage boost type circuit 200, an inductive element L and a capacitive element C.
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.
The buck-boost driving circuit, the method, the air conditioner, and the computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 27.
As shown in fig. 1 to 14, according to an embodiment of the present invention, there is provided a buck-boost driving circuit including: buck circuit 100, said buck circuit 100 comprising: the step-down circuit 100 is configured to be connected to a power supply signal input by a power supply end; the boost circuit 200, an input of the boost circuit 200 is connected to an output of the buck circuit 100, and the boost circuit 200 is configured to boost the power supply signal; and a first power transistor Q1 connected to two output ends of the bridge circuit and to two input ends of the boost circuit, wherein the first power transistor Q1 is configured to freewheel the boost circuit.
In the technical scheme, the buck-type circuit 100 and the boost-type circuit 200 are arranged in the driving circuit, so that the buck-type regulation of the bus voltage is realized, the bus voltage can be higher than the peak value of the alternating-current voltage, the bus voltage can also be lower than the peak value of the alternating-current voltage, the efficiency and the reliability of the motor are improved, and particularly for a permanent magnet synchronous motor, the iron loss of the motor can be reduced by reducing the bus voltage.
As shown in fig. 2, fig. 3 and fig. 4, the power supply signal generally refers to a signal flowing through the driving circuit and driving the load M to operate, and the input signal of the bridge circuit is an alternating current signal AC and the output signal is a bus direct current signal. Therefore, alternating current and alternating voltage are collected at the input end of the bridge circuit, and direct current and direct bus voltage are collected at the output end of the bridge circuit.
Specifically, a plurality of semiconductor switches are arranged in the buck circuit 100 and the boost circuit 200, the semiconductor switches are controlled by a controller, and the controller modulates the working state of the semiconductor switches according to at least one signal of the collected alternating voltage, the collected alternating current, the collected direct current bus voltage and the collected direct current bus current, so as to adjust the working state of the buck circuit 100 and/or the collected boost circuit 200.
Hereinafter, the BUCK circuit 100 of the driving control circuit may be referred to as a bridgeless BUCK circuit, the BOOST circuit 200 may be referred to as a BOOST circuit, an output of the bridgeless BUCK circuit is directly connected to an input of the BOOST circuit and shares the same inductive element L, an input of the bridgeless BUCK circuit is connected to a single-phase ac power supply, and an output of the BOOST circuit is connected to the load M.
As shown in fig. 3 and 4, the load M may be an inverter IPM and a permanent magnet motor driven thereby. The high-voltage output end of the bridge circuit is connected to one end of the inductive element L, the low-voltage output end of the bridge circuit is connected to the low-voltage input end of the BOOST circuit, the drain electrode of the first power tube Q1 is connected to one end of the inductive element L, and the source electrode of the first power tube Q1 is connected to the low-voltage output end of the bridge circuit.
As shown in fig. 4, the main idea of SVPWM is to use the ideal flux linkage circle of the stator of the three-phase symmetric motor as the reference standard when the three-phase symmetric sine-wave voltage is supplied, and to properly switch the three-phase inverter between different switching modes, so as to form a PWM wave, and to track the accurate flux linkage circle by the formed actual flux linkage vector. The traditional SPWM method starts from the power supply to generate a sine wave power supply with adjustable frequency and voltage, and the SVPWM method considers an inverter system and an asynchronous motor as a whole, so that the model is simple and the real-time control of a microprocessor is facilitated.
In addition, the buck-boost driving circuit in the above technical solution provided by the present invention may further have the following additional technical features:
as shown in fig. 5 to 11, in the above technical solution, further, the bridge circuit includes: a first unidirectional conducting tube T1, a second power tube T2, a second unidirectional conducting tube T3 and a third power tube T4, a common end between the first unidirectional conducting tube T1 and the second power tube T2 is connected to a first output end of the power supply end, a common end between the second unidirectional conducting tube T3 and the third power tube T4 is connected to a second output end of the power supply end, a common end between the first unidirectional conducting tube T1 and the second unidirectional conducting tube T3 serves as a high-voltage output end of the bridge circuit, a common end between the second power tube T2 and the third power tube T4 serves as a low-voltage output end of the bridge circuit, wherein both the first unidirectional conducting tube T1 and the second unidirectional conducting tube T3 are turned off, and the first power tube Q1 freewheels the boost type circuit.
In this technical solution, the bridge circuit is specifically configured to include the four power transistors, and the four power transistors are connected in the above manner, so that the AC signal AC can be rectified, the first power transistor Q1 is disposed at the output end of the bridge circuit, when the first power transistor Q1 is turned on, the rectified dc signal cannot be transmitted to the boost circuit 200 at the next stage, when the first power transistor Q1 is turned off, the dc signal output by the bridge circuit is transmitted to the boost circuit 200, and the modulation and boosting can be continuously performed by the boost circuit 200.
The first unidirectional conduction tube T1 and the second unidirectional conduction tube T3 chop the power supply signal to perform voltage reduction modulation on the bus voltage.
As shown in fig. 1 to 8, in any of the above technical solutions, further, the method further includes: the controller is connected to the control ends of the power tubes, the second power tube T2 is provided with first diodes connected in anti-parallel, the third power tubes T4 are provided with second diodes connected in anti-parallel, and 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 second power tube T2 and the third power tube T4 to be turned off, the first diode and the second diode rectify the power supply signal, wherein a drain voltage of the first unidirectional conducting tube T1 is higher than a source voltage, the first unidirectional conducting tube T1 is turned on, a drain voltage of the second unidirectional conducting tube T3 is higher than the source voltage, and the second unidirectional conducting tube T3 is turned on.
In this technical solution, when the controller drives the bridge circuit to perform rectification, the second power transistor T2 and the third power transistor T4 are both turned off, and the first diode and the second diode rectify the power supply signal, wherein a drain voltage of the first unidirectional conducting transistor T1 is higher than a source voltage, the first unidirectional conducting transistor T1 is turned on, a drain voltage of the second unidirectional conducting transistor T3 is higher than the source voltage, and the second unidirectional conducting transistor T3 is turned on.
In addition, in the rectification process, the first unidirectional conducting tube T1 and the first diode are conducted in the same direction, and the second unidirectional conducting tube T3 and the second diode are conducted in the same direction, and in consideration of the unidirectional conducting function, the third power tube T4 and the second power tube T2 may be replaced by diodes.
As shown in fig. 1 to 8, in any of the above technical solutions, further, the method further includes: the controller, the controller is connected to the control end of power tube, second power tube T2 is equipped with anti-parallel first diode, third power tube T4 all is equipped with anti-parallel second diode, the controller drives the bridge circuit and works with synchronous rectification mode, specifically includes: the drain voltage of the first unidirectional conducting tube T1 is higher than the source voltage, the first unidirectional conducting tube T1 is turned on, and meanwhile, the third power tube T4 is turned on, the drain voltage of the second unidirectional conducting tube T3 is higher than the source voltage, the second unidirectional conducting tube T3 is turned on, and meanwhile, the second power tube T2 is turned on.
In the technical scheme, the bridge circuit is driven by the controller to operate in a synchronous rectification mode, namely the drain voltage of the first unidirectional conduction tube T1 is higher than the source voltage, the first unidirectional conduction tube T1 is turned on, and meanwhile, the third power tube T4 is turned on, at the moment, a power supply signal is output through the first unidirectional conduction tube T1 and the third power tube T4, so that the response time is short, and the reliability is high.
Similarly, the drain voltage of the second unidirectional conducting tube T3 is higher than the source voltage, the second unidirectional conducting tube T3 is turned on, and at the same time, the second power tube T2 is turned on, so that the power supply signal is output through the second power tube T2 and the second unidirectional conducting tube T3, the response time is short, and the reliability is high.
As shown in fig. 1 to 8, in any of the above technical solutions, further, the method further includes: the controller, the controller is connected to the control end of power tube, second power tube T2 is equipped with anti-parallel first diode, third power tube T4 all is equipped with anti-parallel second diode, the controller drives the bridge circuit and works with diode rectification step-down mode, specifically includes: the controller controls the second power tube T2 and the third power tube T4 to be turned off, and the first diode and the second diode rectify the power supply signal; the drain voltage of the first unidirectional conducting tube T1 is higher than the source voltage, the controller triggers the first unidirectional conducting tube T1 to be switched on or switched off according to a first duty ratio, the drain voltage of the second unidirectional conducting tube T3 is higher than the source voltage, and the controller triggers the second unidirectional conducting tube T3 to be switched on or switched off according to a second duty ratio.
In this technical solution, the controller drives the bridge circuit to operate in a diode rectification step-down mode, and when performing diode rectification, the controller controls the second power tube T2 and the third power tube T4 to be turned off, the first diode and the second diode rectify the power supply signal, a drain voltage of the first unidirectional conduction tube T1 is higher than a source voltage, the controller triggers the first unidirectional conduction tube T1 to be turned on or off according to a first duty ratio, a drain voltage of the second unidirectional conduction tube T3 is higher than the source voltage, and the controller triggers the second unidirectional conduction tube T3 to be turned on or off according to a second duty ratio.
Wherein the first unidirectional conducting tube T1 and the second unidirectional conducting tube T3 sequentially operate in two half periods of the alternating voltage, in order to improve the reliability of the power device, a dead time is set in a switching period between the first unidirectional conducting tube T1 and the second unidirectional conducting tube T3.
In addition, when the ac voltage is higher than the given value of the dc bus voltage, the controller may trigger the first power transistor Q1 to perform buck modulation at a specified duty cycle, and at the same time, the boost circuit 200 operates in the filtering mode without performing boost modulation, so as to improve the efficiency of the driving circuit.
As shown in fig. 1 to 8, in any of the above technical solutions, further, the method further includes: the controller, the controller is connected to the control end of power tube, second power tube T2 is equipped with anti-parallel first diode, third power tube T4 all is equipped with anti-parallel second diode, the controller drives the bridge circuit and works with synchronous rectification step-down mode, specifically includes: the drain voltage of the first unidirectional conduction tube T1 is higher than the source voltage, the third power tube T4 is turned on, and at the same time, the controller controls the first unidirectional conduction tube T1 to be turned on or off according to a third duty cycle, the drain voltage of the second unidirectional conduction tube T3 is higher than the source voltage, the second power tube T2 is turned on, and at the same time, the controller controls the second unidirectional conduction tube T3 to be turned on or off according to a fourth duty cycle.
In this technical solution, the controller drives the bridge circuit to operate in a synchronous rectification step-down mode, the drain voltage of the first unidirectional conduction tube T1 is higher than the source voltage, the third power tube T4 is turned on, and at the same time, the controller controls the first unidirectional conduction tube T1 to be turned on or off according to a third duty cycle, the drain voltage of the second unidirectional conduction tube T3 is higher than the source voltage, the second power tube T2 is turned on, and at the same time, the controller controls the second unidirectional conduction tube T3 to be turned on or off according to a fourth duty cycle.
When the absolute value of the alternating current voltage is detected to be higher than the given value of the direct current bus voltage in the first half period of the alternating current voltage, the third power tube T4 is conducted, the first unidirectional conduction tube T1 starts modulation operation, and when the absolute value of the alternating current voltage is detected to be higher than the given value of the direct current bus voltage in the second half period of the alternating current voltage, the second power tube T2 is conducted, and the second unidirectional conduction tube T3 starts modulation operation.
In addition, the first unidirectional conducting tube T1 and the second unidirectional conducting tube T3 sequentially operate in two half periods of the alternating-current voltage, and in order to improve the reliability of the power device, a dead time is set in a switching period between the first unidirectional conducting tube T1 and the second unidirectional conducting tube T3.
In addition, the second power transistor T2 and the third power transistor T4 are sequentially operated in two half cycles of the ac voltage, and in order to improve the reliability of the power device, a dead time is provided for a switching period between the second power transistor T2 and the third power transistor T4.
In any of the above technical solutions, further, the method further includes: one of the first unidirectional conducting tube T1 and the third power tube T4 is a reverse blocking switch tube or an insulated gate transistor, and the other of the first unidirectional conducting tube T1 and the third power tube T4 is an uncontrolled diode or a metal oxide semiconductor; and one of the second power transistor T2 and the second unidirectional conducting transistor T3 is a reverse blocking switch transistor or an insulated gate transistor, and the other of the second power transistor T2 and the second unidirectional conducting transistor T3 is an uncontrolled diode or a metal oxide semiconductor transistor.
In this technical solution, one of the second power transistor T2 and the third power transistor T4 may be a reverse blocking switch transistor or an insulated gate transistor that can modulate operation, and the other is an uncontrolled diode or a metal oxide semiconductor, which is beneficial to reducing power consumption and reliability of the driving circuit.
As shown in fig. 12 and 13, in any of the above technical solutions, further, the reverse blocking switch tube 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, further, 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 P-channel metal oxide semiconductor tube.
Specifically, the two P-type MOS switching tubes are connected with the anodes of the diodes which are connected in series in the reverse direction and in anti-parallel, and a comparator and a driver are added. The comparator compares the voltage of the upper end and the lower end of the two MOS tubes, when the voltage of the upper end A is higher than the voltage of the lower end B, the driver is turned off, the MOS tubes are in a turned-off state, and when the voltage of the lower end B is higher than the voltage of the upper end A, the driver is enabled, so that the switching tubes can be controlled by a control signal to realize the on-off.
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.
Specifically, the two N-type MOS switching tubes are connected with the cathodes of the diodes which are connected in series and in anti-parallel in an opposite direction, and a comparator and a driver are added. The comparator compares the voltages of the upper end and the lower end of the two MOS tubes, and when the voltage of the upper end A is higher than the voltage of the lower end B, the driver is closed, and the MOS tubes are in a closed state; when the voltage of the lower end B is higher than the voltage of the upper end A, the driver is enabled, so that the switch tube can be controlled by a control signal to realize the on-off.
In any of the above technical solutions, further, the reverse blocking switch tube includes: the diode D0 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 D0 is opposite to the conduction direction of the anti-parallel diode.
In the technical scheme, the reverse blocking switch tube comprises a diode D0 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 D0 is opposite to the conducting direction of the anti-parallel diode, when the metal oxide semiconductor tube is cut off, the diode D0 and the anti-parallel diode which are connected in series are cut off due to the fact that the conducting directions are opposite, and on the basis of the technical scheme, the problems of large diode voltage drop, large power consumption and the like are solved, and the response efficiency is high.
As shown in fig. 14, the N-channel mos transistor includes a gate G, a source S and a drain D, and the source S is connected to an anode of a diode D0.
In any of the above technical solutions, further, the boost circuit 200 includes: the first end of the inductive element L is connected to the high-voltage output end of the bridge circuit; a fourth power tube Q3 connected between the second end of the inductive element L and the low-voltage output end of the bridge circuit; a fifth power transistor Q2, connected between the second terminal of the inductive element L and the first terminal of the capacitive element C, the second terminal of the capacitive element C being connected to the low voltage output terminal, and a controller, the controller being connected to the control terminal of the fourth power transistor Q3 and the control terminal of the fifth power transistor Q2, the controller controlling the boost circuit 200 to operate in a boost mode, specifically comprising: the controller determines a fifth duty ratio according to a given voltage value corresponding to the bus voltage between the high-voltage output end and the low-voltage output end and the bus voltage, the controller controls the fourth power tube Q3 to be switched on or switched off according to the fifth duty ratio, and the fifth power tube Q2 and the fourth power tube Q3 are alternately switched on or kept switched off.
In this technical solution, the boost circuit 200 includes an inductive element L, a fourth power tube Q3, and a fifth power tube Q2, where the controller determines a fifth duty ratio according to a given voltage value corresponding to a bus voltage between the high-voltage output end and the low-voltage output end and the bus voltage, and the controller controls the fourth power tube Q3 to be turned on or off according to the fifth duty ratio, and at this time, the boost circuit 200 performs boost modulation on the bus dc voltage to meet the operation requirement and reliability of the load M.
In any of the above technical solutions, further, the boost circuit 200 includes: the first end of the inductive element L is connected to the high-voltage output end of the bridge circuit; a fourth power tube Q3 connected between the second end of the inductive element L and the low-voltage output end of the bridge circuit; a fifth power transistor Q2, connected between the second terminal of the inductive element L and the first terminal of the capacitive element C, the second terminal of the capacitive element C being connected to the low voltage output terminal, and a controller, the controller being connected to the control terminal of the fourth power transistor Q3 and the control terminal of the fifth power transistor Q2, the controller controlling the boost circuit 200 to operate in a filtering mode, specifically comprising: the controller controls the fifth power tube Q2 to be switched on, and the controller controls the fourth power tube Q3 to be switched off.
In this technical solution, the boost circuit 200 includes an inductive element L, a fourth power tube Q3, and a fifth power tube Q2, where the controller controls the fifth power tube Q2 to be turned on, and the controller controls the fourth power tube Q3 to be turned off, and at this time, the boost circuit 200 performs through filtering on the bus dc voltage to reduce ripple noise in the driving circuit.
The BOOST circuit comprises a fourth power tube Q3, a fifth power tube Q2, an inductive element L and a capacitive element C, wherein the source electrode of the fifth power tube Q2 and the drain electrode of the fourth power tube Q3 are connected with one end of the inductive element L, the source electrode of the fourth power tube Q3 is connected with the low-voltage output of the bridge circuit and the negative electrode of the first electrolytic capacitor, and the drain electrode of the fifth power tube Q2 is connected with the positive electrode of the capacitive element C.
The first unidirectional conducting tube T1 and the second unidirectional conducting tube T3 may be reverse blocking power switching tubes, or may be IGBTs (Insulated Gate Bipolar transistors) without antiparallel diodes or circuit modules implemented by reverse blocking power switching tubes, the second power tube T2, the third power tube T4, the first power tube Q1 and the fifth power tube Q2 are bidirectional conducting power switching tubes, or may be MOSFETs (Metal-Oxide-Semiconductor Field Effect transistors, mos transistors for short), MOSFETs based on SiC materials, or MOSFETs based on GaN materials, the fourth power tube Q3 may be a power switching tube, or may be an IGBT, or a MOSFET based on Si materials, a MOSFET based on SiC materials, or a MOSFET based on GaN materials. The second power transistor T2, the third power transistor T4, the first power transistor Q1, the fourth power transistor Q3 and the fifth power transistor Q2 need to have an anti-parallel diode, such as a parasitic diode or an external parallel diode, and neither the first unidirectional conducting transistor T1 nor the second unidirectional conducting transistor T3 has an anti-parallel diode.
In addition, the driving circuit also comprises other equivalent alternatives, specifically as follows:
(1) as shown in fig. 4, the second power transistor T2, the fourth power transistor, and the first power transistor Q1 of the bridgeless BOOST circuit may be replaced by uncontrolled diodes, which do not need to be controlled to be turned on or off.
(2) As shown in fig. 8, the fifth power transistor Q2 of the bridgeless BOOST circuit can be replaced by an uncontrolled diode, which does not need to be controlled.
In conclusion, the cost is lower by adopting the uncontrolled diode, but the conduction loss of the diode is increased, and particularly under the condition of medium-low load operation, the conduction voltage drop of the diode is larger than that of the MOSFET.
The bridgeless BUCK circuit of the drive control circuit comprises a first unidirectional conduction tube T1 and a third power tube T4 in a group, and a second power tube T2 and a second unidirectional conduction tube T3 in a group.
As shown in fig. 10, the control logic is based on that the first unidirectional conducting transistor T1 is a reverse blocking power switch, and the third power transistor T4 is a bidirectional conducting power switch. As shown in fig. 9 and fig. 11, if the third power transistor T4 is a reverse blocking power switch and the first unidirectional conducting transistor T1 is a bidirectional conducting power switch, the control logic for controlling the above control logic, the first unidirectional conducting transistor T1 and the third power transistor T4, is reversed.
As shown in fig. 9, the control logic is based on that the second unidirectional conducting transistor T3 is a reverse blocking power switch, and the second power transistor T2 is a bidirectional conducting power switch. As shown in fig. 9 and fig. 11, if the second power transistor T2 is a reverse blocking power transistor and the second unidirectional conducting transistor T3 is a bidirectional conducting power transistor, the control logic for controlling the above control logic, the second power transistor T2 and the second unidirectional conducting transistor T3, is reversed.
As shown in fig. 15 to 25, a buck-boost driving method according to another embodiment of the present invention includes: step S302, determining an alternating current voltage input to the driving circuit and a bus voltage of the driving circuit; step S304, controlling the buck circuit 100 to operate in a rectifying mode or a buck mode, and controlling the boost circuit 200 to operate in a boost mode or a filter mode according to the ac voltage and the bus voltage.
In this technical solution, a buck circuit 100 and a boost circuit 200 are provided in a driving circuit, and according to the ac voltage and the bus voltage, the buck circuit 100 is controlled to operate in a rectification mode or a buck mode, and the boost circuit 200 is controlled to operate in a boost mode or a filter mode, so as to implement buck-boost regulation of the bus voltage.
The power supply signal generally refers to a signal flowing through the driving circuit and driving the load M to operate, an input signal of the bridge circuit is an alternating current signal AC, and an output signal is a bus direct current signal. Therefore, alternating current and alternating voltage are collected at the input end of the bridge circuit, and direct current and direct bus voltage are collected at the output end of the bridge circuit.
Specifically, a plurality of semiconductor switches are arranged in the buck circuit 100 and the boost circuit 200, the semiconductor switches are controlled by a controller, and the controller modulates the working state of the semiconductor switches according to at least one signal of the collected alternating voltage, the collected alternating current, the collected direct current bus voltage and the collected direct current bus current, so as to adjust the working state of the buck circuit 100 and/or the collected boost circuit 200.
The following illustrates various operating modes of the driving circuit, specifically as follows:
(1) when the bridgeless BUCK circuit works in a diode rectification state and a synchronous rectification state, the BOOST circuit can work in a direct-through filtering state and can also work in a BOOST boosting control state; when the bridgeless BUCK circuit works in the BUCK voltage reduction control state, the BOOST circuit can only work in a through filtering state.
(2) The working states of the bridgeless BUCK circuit include diode rectification, synchronous rectification, diode rectification + BUCK control (as shown in fig. 19), and synchronous rectification + BUCK control (as shown in fig. 20).
(3) Diode rectification state: the second power tube T2 and the third power tube T4 are both in an off state, and are rectified by their anti-parallel diodes, the first unidirectional conduction tube T1 is turned on when the drain voltage of the first unidirectional conduction tube T1 is higher than the source voltage, and is turned off otherwise, and the second unidirectional conduction tube T3 is turned on when the drain voltage of the second unidirectional conduction tube T3 is higher than the source voltage, and is turned off otherwise.
(4) And (3) synchronous rectification state: the first unidirectional conduction tube T1 is turned on when the drain voltage of the first unidirectional conduction tube T1 is higher than the source voltage, and is turned off otherwise, and the second unidirectional conduction tube T3 is turned on when the drain voltage of the second unidirectional conduction tube T3 is higher than the source voltage, and is turned off otherwise; the second power tube T2 is turned on when the drain voltage of the second unidirectional conducting tube T3 is higher than the source voltage, and is turned off otherwise; the third power transistor T4 is turned on when the drain voltage of the first unidirectional conducting transistor T1 is higher than the source voltage, and is turned off otherwise.
(5) Diode rectification + BUCK step-down control state: the first unidirectional conduction tube T1 performs PWM duty cycle regulation control when the drain voltage of the first unidirectional conduction tube T1 is higher than the source voltage, and the second unidirectional conduction tube T3 performs PWM duty cycle regulation control when the drain voltage of the second unidirectional conduction tube T3 is higher than the source voltage; the second power transistor T2 and the third power transistor T4 are both in an off state.
(6) Synchronous rectification + BUCK voltage reduction control state: the first unidirectional conduction tube T1 performs PWM duty cycle regulation control when the drain voltage of the first unidirectional conduction tube T1 is higher than the source voltage, and the second unidirectional conduction tube T3 performs PWM duty cycle regulation control when the drain voltage of the second unidirectional conduction tube T3 is higher than the source voltage; the second power tube T2 is turned on when the drain voltage of the second unidirectional conducting tube T3 is higher than the source voltage, and is turned off otherwise; the third power transistor T4 is turned on when the drain voltage of the first unidirectional conducting transistor T1 is higher than the source voltage, and is turned off otherwise.
As shown in fig. 19, the diode rectification + BUCK + LC filter mode power switch states.
As shown in fig. 20, synchronous rectification + BUCK + LC filtering mode power switch states.
As shown in fig. 21, the switching state of the power switch device under the two modes of (diode rectification + BUCK + LC filtering) and (diode rectification + BOOST) switching is schematically illustrated.
As shown in fig. 22, the switching state of the power switch device under the two modes of (synchronous rectification + BUCK + LC filtering) and (synchronous rectification + BOOST) switching is schematically shown.
As shown in fig. 23, the power switch switching states in diode rectification + BOOST mode.
As shown in fig. 24, the power switch switching states in synchronous rectification + BOOST mode.
In addition, the working state of the BOOST circuit comprises a through filtering and a BUCK voltage reduction control, and the working state comprises the following specific steps:
(1) a through filtering state: and controlling the fifth power tube Q2 of the power switch tube to be continuously conducted and the fourth power tube Q3 of the power switch tube to be continuously turned off so as to achieve direct LC filtering.
(2) BOOST control state: and the boost regulation function is realized by controlling a fourth power tube Q3 of the power switch tube, and closed-loop control is performed according to the given value and the detected value of the direct-current bus voltage. When the fourth power tube Q3 of the power switch tube is turned on, the fifth power tube Q2 of the power switch tube is controlled to be turned off; when the power switch tube fourth power tube Q3 is turned off, the power switch tube fifth power tube Q2 is controlled to be turned on or off.
The non-control mode of the drive circuit includes the following:
(1) when the voltage is not controlled, the bridgeless BUCK circuit works in a diode rectification state (as shown in figure 17) or a synchronous rectification state (as shown in figure 18), and the BOOST circuit works in a through filtering state, which is equivalent to an LC filter.
(2) In the step-down control mode, the bridgeless BUCK circuit works in a diode rectification + BUCK step-down control state or a synchronous rectification + BUCK step-down control state, and the BOOST circuit works in a through filtering state, which is equivalent to an LC filter.
(3) In the BOOST control mode, the bridgeless BUCK circuit works in a BOOST diode rectification state or a synchronous rectification state, and the BOOST circuit works in a BOOST control state.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit 100 to operate in a rectification mode or a buck mode, and controlling the boost circuit 200 to operate in a boost mode or a filter mode specifically includes: determining a voltage set point for the bus voltage; comparing the magnitude relation between the voltage given value and the alternating voltage; and controlling the buck circuit 100 to work in a rectification mode or a buck mode and controlling the boost circuit 200 to work in a boost mode or a filter mode according to the magnitude relation between the voltage given value and the alternating voltage.
In this embodiment, the step-down circuit 100 is further controlled to operate in a rectifying mode or a buck mode and the step-up circuit 200 is controlled to operate in a boost mode or a filter mode according to a magnitude relationship between the voltage given value and the ac voltage, so as to improve the operating efficiency of the driving circuit, when the step-down circuit 100 operates in the buck mode, the step-up circuit 200 operates in the filter mode, or when the step-up circuit 200 operates in the boost mode, the step-down circuit 100 operates in the rectifying mode, and in addition, the step-down circuit 100 operates in the rectifying mode, and at the same time, the step-up circuit may operate in the filter mode.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit 100 to operate in a rectification mode or a buck mode, and controlling the boost circuit 200 to operate in a boost mode or a filter mode specifically includes: determining the product between the effective value of the alternating voltage and a first voltage coefficient, and recording the product as a first voltage sampling value; when the first voltage sampling value is detected to be greater than or equal to the given voltage value corresponding to the bus voltage, the step-down circuit 100 is controlled to work in the step-down mode, and the step-up circuit 200 is controlled to work in the filtering mode; and when the first voltage sampling value is detected to be smaller than the given voltage value corresponding to the bus voltage, controlling the buck circuit 100 to work in the rectification mode, and controlling the boost circuit 200 to work in the filtering mode.
In the technical scheme, the instantaneous value of the alternating voltage can be determined by determining the product between the effective value of the alternating voltage and the first voltage coefficient and recording the product as the first voltage sampling value, and the voltage uncontrolled mode is entered when the absolute value of the instantaneous alternating voltage is smaller than the given direct current bus voltage, so that voltage reduction processing is not required, the power consumption of the driving circuit is reduced by entering the uncontrolled mode at the moment, otherwise, the voltage reduced controlled mode is entered, the alternating voltage is reduced in time, and the impact of the alternating voltage on the rear-stage circuit of the voltage reduction type circuit 100 is reduced.
In the voltage non-control mode, the buck circuit 100 operates in the diode rectification or synchronous rectification state, and the boost circuit 200 operates in the pass filter state.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit 100 to operate in a rectification mode or a buck mode, and controlling the boost circuit 200 to operate in a boost mode or a filter mode specifically includes: determining the product between the effective value of the alternating voltage and a first voltage coefficient, and recording the product as a first voltage sampling value; determining the product between the effective value of the alternating voltage and a second voltage coefficient, and recording the product as a second voltage sampling value; detecting that the first voltage sampling value is smaller than a voltage given value corresponding to the bus voltage, and detecting that the second voltage sampling value is larger than or equal to the voltage given value corresponding to the bus voltage, and detecting an instantaneous value of the alternating voltage; when the instantaneous value of the alternating voltage is detected to be smaller than the given voltage value corresponding to the bus voltage, the step-up circuit 200 is controlled to work in the step-up mode, and the step-down circuit 100 is controlled to work in the rectification mode; when the instantaneous value of the alternating voltage is detected to be greater than or equal to the given voltage value corresponding to the bus voltage, the buck circuit 100 is controlled to operate in the buck mode, and the boost circuit 200 is controlled to operate in the filter mode.
In the technical scheme, a first voltage sampling value is smaller than a second voltage sampling value, and if the first voltage sampling value is detected to be smaller than a voltage set value corresponding to the bus voltage and the second voltage sampling value is detected to be larger than or equal to the voltage set value corresponding to the bus voltage, the rising trend of the alternating current voltage is continuously predicted and detected, so that the instantaneous value of the alternating current voltage is continuously detected.
Further, if it is detected that the instantaneous value of the ac voltage is greater than or equal to the given voltage value corresponding to the bus voltage, the buck circuit 100 is controlled to operate in the buck mode, and the ac voltage is timely reduced, and in addition, the boost circuit 200 is controlled to operate in the filter mode, so as to improve the efficiency of the driving circuit.
In any of the above technical solutions, further, according to the ac voltage and the bus voltage, controlling the buck circuit 100 to operate in a rectification mode or a buck mode, and controlling the boost circuit 200 to operate in a boost mode or a filter mode specifically includes: determining the product between the effective value of the alternating voltage and a second voltage coefficient, and recording the product as a second voltage sampling value; and when the second voltage sampling value is detected to be smaller than the given voltage value corresponding to the bus voltage, controlling the boost circuit 200 to work in a boost mode.
In this technical solution, when the second voltage sampling value is detected to be smaller than the given voltage value corresponding to the bus voltage, the boost circuit 200 is controlled to operate in a boost mode, that is, the possibility of dc bus voltage drop and motor shutdown is reduced by boosting in time.
In the boost mode, the buck circuit 100 operates in a rectifying state, and the boost circuit 200 operates in a boost modulation state.
In any one of the above technical solutions, further, the motor is a permanent magnet synchronous motor, and the driving method further includes: determining the rotating speed and the back electromotive force coefficient of the permanent magnet synchronous motor; and determining a voltage given value corresponding to the bus voltage according to the rotating speed and the back electromotive force coefficient.
In the technical scheme, the voltage given value corresponding to the bus voltage is determined through the back electromotive force coefficient, so that the reliability and flexibility of the voltage boosting and reducing regulation of the direct current bus voltage are further improved.
The direct-current bus voltage is given as the rotation speed multiplied by the phase voltage counter potential coefficient multiplied by the third voltage coefficient.
Optionally, 1 ≦ third voltage coefficient ≦ 2.5.
Preferably, 1.5 ≦ third voltage coefficient ≦ 2.
In any of the above technical solutions, further, the rectification mode includes a diode rectification mode and a synchronous rectification mode.
As shown in fig. 26, an air conditioner 400 according to an embodiment of the present invention includes: a motor 402; the buck-boost driver circuit 404 as defined in any of the above embodiments, the driver circuit 404 configured to control the operation of the motor 402.
In this technical solution, the air conditioner includes the buck-boost driving circuit in any one of the above technical solutions, and therefore, the air conditioner includes all the beneficial effects of the buck-boost driving circuit in any one of the above technical solutions, and therefore details are not described again.
As shown in fig. 27, according to a computer-readable storage medium 500 of an embodiment of the present invention, the computer-readable storage medium 500 stores thereon a computer program, and the computer program realizes the driving method defined in any one of the above-mentioned technical solutions when being executed by the air conditioner 400.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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 (21)

1. A buck-boost driver circuit, comprising:
a buck circuit, the buck circuit comprising:
the power supply circuit comprises a bridge circuit, a voltage reduction type circuit and a power supply circuit, wherein a semiconductor tube is arranged in any bridge arm of the bridge circuit, and the voltage reduction type circuit is configured to be connected with a power supply signal input by a power supply end;
a boost-type circuit having an input connected to an output of the buck-type circuit, the boost-type circuit configured to boost the supply signal;
and the first power tube is connected to two output ends of the bridge circuit and two input ends of the boost type circuit, and the first power tube is configured to freewheel the boost type circuit.
2. The buck-boost driver circuit according to claim 1, wherein the bridge circuit comprises:
the common end between the first unidirectional conduction tube and the second power tube is connected to the first output end of the power supply end, the common end between the second unidirectional conduction tube and the third power tube is connected to the second output end of the power supply end, the common end between the first unidirectional conduction tube and the second unidirectional conduction tube is used as the high-voltage output end of the bridge circuit, and the common end between the second power tube and the third power tube is used as the low-voltage output end of the bridge circuit,
the first unidirectional conduction tube and the second unidirectional conduction tube are both cut off, and the first power tube conducts follow current to the boost circuit.
3. The buck-boost driver circuit according to claim 2, further comprising:
the controller is connected to the control ends of the power tubes, the second power tube is provided with first diodes which are connected in anti-parallel, the third power tubes are provided with second diodes which are connected in anti-parallel,
the controller drives the bridge circuit to work in a diode rectification mode, and specifically comprises:
the controller controls the second power tube and the third power tube to be cut off, the first diode and the second diode rectify the power supply signal,
the drain voltage of the first unidirectional conduction tube is higher than the source voltage, and the first unidirectional conduction tube is conducted; the drain voltage of the second unidirectional conduction tube is higher than the source voltage, and the second unidirectional conduction tube is conducted.
4. The buck-boost driver circuit according to claim 2, further comprising:
the controller is connected to the control ends of the power tubes, the second power tube is provided with first diodes which are connected in anti-parallel, the third power tubes are provided with second diodes which are connected in anti-parallel,
the controller drives the bridge circuit to work in a synchronous rectification mode, and specifically comprises:
the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the first unidirectional conduction tube is conducted, meanwhile, the third power tube is conducted, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, the second unidirectional conduction tube is conducted, and meanwhile, the second power tube is conducted.
5. The buck-boost driver circuit according to claim 2, further comprising:
the controller is connected to the control ends of the power tubes, the second power tube is provided with first diodes which are connected in anti-parallel, the third power tubes are provided with second diodes which are connected in anti-parallel,
the controller drives the bridge circuit to work in a diode rectification step-down mode, and specifically comprises:
the controller controls the second power tube and the third power tube to be cut off, and the first diode and the second diode rectify the power supply signal;
the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the controller triggers the first unidirectional conduction tube to be switched on or switched off according to a first duty ratio, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, and the controller triggers the second unidirectional conduction tube to be switched on or switched off according to a second duty ratio.
6. The buck-boost driver circuit according to claim 2, further comprising:
the controller is connected to the control ends of the power tubes, the second power tube is provided with first diodes which are connected in anti-parallel, the third power tubes are provided with second diodes which are connected in anti-parallel,
the controller drives the bridge circuit to work in a synchronous rectification voltage reduction mode, and specifically comprises:
the drain voltage of the first unidirectional conduction tube is higher than the source voltage, the third power tube is conducted, meanwhile, the controller controls the first unidirectional conduction tube to be conducted or cut off according to a third duty ratio, the drain voltage of the second unidirectional conduction tube is higher than the source voltage, the second power tube is conducted, and meanwhile, the controller controls the second unidirectional conduction tube to be conducted or cut off according to a fourth duty ratio.
7. The buck-boost driver circuit according to any one of claims 2 to 6, further comprising:
one power tube of the first unidirectional conduction tube and the third power tube is a reverse blocking switch tube or an insulated gate transistor, and the other power tube of the first unidirectional conduction tube and the third power tube is an uncontrolled diode or a metal oxide semiconductor tube;
and one of the second power tube and the second unidirectional conduction tube is a reverse blocking switch tube or an insulated gate transistor, and the other of the second power tube and the second unidirectional conduction tube is an uncontrolled diode or a metal oxide semiconductor tube.
8. The buck-boost driver circuit according to claim 7, wherein the reverse blocking switch 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.
9. The buck-boost driver circuit according to claim 7, 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.
10. The buck-boost driver circuit according to claim 7, 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.
11. The buck-boost driver circuit according to any one of claims 1 to 6, wherein the boost type circuit comprises:
the first end of the inductive element is connected to the high-voltage output end of the bridge circuit;
the fourth power tube is connected between the second end of the inductive element and the low-voltage output end of the bridge circuit;
a fifth power transistor connected between the second end of the inductive element and the first end of the capacitive element, the second end of the capacitive element being connected to the low voltage output terminal,
a controller connected to the control terminal of the fourth power transistor and the control terminal of the fifth power transistor,
the controller controls the boost circuit to operate in a boost mode, and specifically includes:
and the controller determines a fifth duty ratio according to a given voltage value corresponding to the bus voltage between the high-voltage output end and the low-voltage output end and the bus voltage, controls the fourth power tube to be switched on or switched off according to the fifth duty ratio, and alternately switches on or switches off the fifth power tube and the fourth power tube.
12. The buck-boost driver circuit according to any one of claims 1 to 6, wherein the boost type circuit comprises:
the first end of the inductive element is connected to the high-voltage output end of the bridge circuit;
the fourth power tube is connected between the second end of the inductive element and the low-voltage output end of the bridge circuit;
a fifth power transistor connected between the second end of the inductive element and the first end of the capacitive element, the second end of the capacitive element being connected to the low voltage output terminal,
a controller connected to the control terminal of the fourth power transistor and the control terminal of the fifth power transistor,
the controller controls the boost circuit to operate in a filtering mode, and specifically includes:
the controller controls the fifth power tube to be switched on, and the controller controls the fourth power tube to be switched off.
13. A buck-boost driving method applied to the buck-boost driving circuit according to any one of claims 1 to 12, wherein the driving circuit comprises a boost circuit and a buck circuit which are electrically connected, and the driving method comprises:
determining an alternating current voltage input to the driving circuit and a bus voltage of the driving circuit;
and controlling the step-down circuit to work in a rectification mode or a step-down mode and controlling the step-up circuit to work in a step-up mode or a filtering mode according to the alternating voltage and the bus voltage.
14. The buck-boost driving method according to claim 13, wherein controlling the buck-type circuit to operate in a rectifying mode or a buck mode and controlling the boost-type circuit to operate in a boost mode or a filter mode according to the ac voltage and the bus voltage comprises:
determining a voltage set point for the bus voltage;
comparing the magnitude relation between the voltage given value and the alternating voltage;
and controlling the step-down circuit to work in a rectification mode or a step-down mode and controlling the step-up circuit to work in a step-up mode or a filtering mode according to the magnitude relation between the voltage given value and the alternating voltage.
15. The buck-boost driving method according to claim 14, wherein controlling the buck-type circuit to operate in a rectifying mode or a buck mode and controlling the boost-type circuit to operate in a boost mode or a filter mode according to the ac voltage and the bus voltage comprises:
determining the product between the effective value of the alternating voltage and a first voltage coefficient, and recording the product as a first voltage sampling value;
when the first voltage sampling value is detected to be larger than or equal to the given voltage value corresponding to the bus voltage, the step-down circuit is controlled to work in the step-down mode, and the step-up circuit is controlled to work in the filtering mode;
and when the first voltage sampling value is detected to be smaller than the voltage given value corresponding to the bus voltage, controlling the voltage reduction type circuit to work in the rectification mode, and controlling the voltage boost type circuit to work in the filtering mode.
16. The buck-boost driving method according to claim 14, wherein controlling the buck-type circuit to operate in a rectifying mode or a buck mode and controlling the boost-type circuit to operate in a boost mode or a filter mode according to the ac voltage and the bus voltage comprises:
determining the product between the effective value of the alternating voltage and a first voltage coefficient, and recording the product as a first voltage sampling value;
determining the product between the effective value of the alternating voltage and a second voltage coefficient, and recording the product as a second voltage sampling value;
detecting that the first voltage sampling value is smaller than a voltage given value corresponding to the bus voltage, and detecting that the second voltage sampling value is larger than or equal to the voltage given value corresponding to the bus voltage, and detecting an instantaneous value of the alternating voltage;
when the instantaneous value of the alternating voltage is detected to be smaller than the given voltage value corresponding to the bus voltage, the step-up circuit is controlled to work in the step-up mode, and the step-down circuit is controlled to work in the rectification mode;
and when the instantaneous value of the alternating voltage is detected to be larger than or equal to the voltage given value corresponding to the bus voltage, controlling the voltage reduction type circuit to work in a voltage reduction mode, and controlling the voltage boost type circuit to work in a filtering mode.
17. The buck-boost driving method according to claim 14, wherein controlling the buck-type circuit to operate in a rectifying mode or a buck mode and controlling the boost-type circuit to operate in a boost mode or a filter mode according to the ac voltage and the bus voltage comprises:
determining the product between the effective value of the alternating voltage and a second voltage coefficient, and recording the product as a second voltage sampling value;
and when the second voltage sampling value is detected to be smaller than the voltage given value corresponding to the bus voltage, controlling the boost type circuit to work in a boost mode, and simultaneously controlling the buck type circuit to work in a rectification mode.
18. The buck-boost driving method according to any one of claims 13 to 17, wherein the motor is a permanent magnet synchronous motor, the driving method further comprising:
determining the rotating speed and the back electromotive force coefficient of the permanent magnet synchronous motor;
and determining a voltage given value corresponding to the bus voltage according to the rotating speed and the back electromotive force coefficient.
19. The buck-boost driving method according to any one of claims 13 to 17,
the rectification mode includes a diode rectification mode and a synchronous rectification mode.
20. An air conditioner, comprising:
a motor;
the buck-boost drive circuit of any one of claims 1 to 12, the drive circuit configured to control operation of the motor.
21. 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 13 to 19.
CN202010188837.9A 2020-03-17 2020-03-17 Buck-boost driving circuit, method, air conditioner and computer readable storage medium Active CN111224564B (en)

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