CN113410978A - Power supply circuit, frequency conversion device and electric equipment - Google Patents

Power supply circuit, frequency conversion device and electric equipment Download PDF

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Publication number
CN113410978A
CN113410978A CN202110563754.8A CN202110563754A CN113410978A CN 113410978 A CN113410978 A CN 113410978A CN 202110563754 A CN202110563754 A CN 202110563754A CN 113410978 A CN113410978 A CN 113410978A
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CN
China
Prior art keywords
power supply
voltage
phase
energy storage
bootstrap
Prior art date
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Pending
Application number
CN202110563754.8A
Other languages
Chinese (zh)
Inventor
胡象辉
邵海柱
耿焱
丛安平
张波
贾新旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd, Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Priority to CN202110563754.8A priority Critical patent/CN113410978A/en
Publication of CN113410978A publication Critical patent/CN113410978A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/297—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 for conversion of frequency

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

Abstract

The application relates to the technical field of power supply of frequency converters, and discloses a power supply circuit which comprises a power storage module and a bootstrap power supply module; the power storage module is configured to provide a first voltage; the bootstrap power supply module is connected with the power storage module and is configured to output a plurality of second voltages under the driving of the first voltage; the bootstrap power supply module comprises a plurality of bootstrap power supply units; each power supply unit comprises: the power supply comprises a first voltage input end, a second voltage output end, a phase input end, a first energy storage element, a voltage stabilizing device, a first resistor and a second resistor; a first resistor is arranged between the second voltage output end and the first voltage input end; a second resistor is arranged between the phase input end and the second voltage output end; the first energy storage element is connected with the second resistor in parallel; the voltage stabilizing device is connected with the first energy storage element in parallel and is configured to limit the storage voltage of the first energy storage element. The bootstrap power supply module is driven by the electric storage module to output a plurality of voltages. The application also discloses a frequency conversion device and electric equipment.

Description

Power supply circuit, frequency conversion device and electric equipment
Technical Field
The present application relates to the field of power supply technologies for frequency converters, and for example, to a power supply circuit, a frequency conversion device, and a power utilization apparatus.
Background
Currently, in inverter air conditioning systems, the inverter plays a crucial role in powering the compressor. An Insulated Gate Bipolar Transistor (IGBT) module is used as a core component of the frequency converter, and the number of IGBT units included in the IGBT module is different according to different air conditioner specifications and configurations. For a high-power commercial air conditioning system, the number of power supply sources required by an IGBT module in a frequency converter is also large. In order to solve the problem, in the prior art, a switching power supply is used for providing multiple paths of power supplies with specific voltage for the IGBT module, so as to supply power to the IGBT module.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a power supply circuit, a frequency conversion device and electric equipment, so as to replace the scheme of providing a plurality of paths of power supply sources with specific voltage for an IGBT module through a switching power supply in the prior art.
In some embodiments, the power supply circuit includes a storage module and a bootstrap power supply module; the power storage module is configured to provide a first voltage; the bootstrap power supply module is connected with the power storage module and is configured to output a plurality of second voltages under the driving of the first voltage; the bootstrap power supply module comprises a plurality of bootstrap power supply units; each power supply unit comprises: the power supply comprises a first voltage input end, a second voltage output end, a phase input end, a first energy storage element, a voltage stabilizing device, a first resistor and a second resistor; a first resistor is arranged between the second voltage output end and the first voltage input end; a second resistor is arranged between the phase input end and the second voltage output end; the first energy storage element is connected with the second resistor in parallel; the voltage stabilizing device is connected in parallel with the first energy storage element and is configured to limit the storage voltage of the first energy storage element.
In some embodiments, the frequency conversion device comprises a phase-change power supply, an IGBT module and the above power supply circuit; the phase change power supply is configured to provide a voltage to a phase inlet end of the power supply circuit; the IGBT module is configured to provide an analog variable frequency voltage driven by a plurality of second voltages output by the power supply circuit.
In some embodiments, the electric device comprises the frequency conversion device.
The power supply circuit, the frequency conversion device and the electric equipment provided by the embodiment of the disclosure can realize the following technical effects:
the power storage module of the power supply module supplies a first voltage to the bootstrap power supply module, so that the bootstrap power supply module outputs a plurality of second voltages through the action of a plurality of bootstrap power supply units on the input first voltage; each bootstrap power supply unit respectively provides a second voltage to the second voltage output end through the charging process of the first energy storage element and the first energy storage element; the charging voltage of the first energy storage element is controlled by the voltage stabilizing devices connected in parallel to two ends of the first energy storage element, so that the second voltage output by the first energy storage element to the second voltage output end meets the voltage requirement of the electric device connected with the first energy storage element. Like this, through the effect of the supply circuit that this disclosed embodiment provided, realized to its input commercial power three-phase voltage, can effectively output rather than the required a plurality of second voltages of electrical apparatus of being connected with it. When the electric device is the IGBT module, the plurality of second voltages supply power for the IGBT module, so that the IGBT module can output analog variable frequency signals, the power supply cost of the plurality of second voltages is reduced, and the maintainability of the power supply module is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a circuit diagram of a prior art bootstrap circuit model provided by an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a power storage module of a power supply circuit provided in an embodiment of the present disclosure;
FIG. 3 is a circuit schematic diagram of a phase-inlet branch according to an embodiment of the present disclosure;
FIG. 4 is a circuit diagram of a bootstrap power module of a power supply circuit provided in the embodiment of the present disclosure;
FIG. 5 is a circuit diagram of a bootstrap power supply unit provided in the embodiments of the present disclosure;
fig. 6 is a schematic structural diagram of a frequency conversion apparatus provided in the embodiment of the present disclosure;
fig. 7 is a circuit schematic diagram of an IGBT module provided by an embodiment of the disclosure.
Reference numerals:
100. a phase change power supply; 101. a voltage input terminal; 102. a voltage output terminal; 103. a ground terminal; 111. an inductance element; 112. a capacitive element; 113. a resistance element; 121. a diode; 122. a triode; 200. a power supply circuit; 211. a switch unit; 212. a first control terminal; 213. a second control terminal; 221. a first phase inlet branch; 222. a second phase inlet branch; 223. a third phase inlet branch; 230. a second energy storage element; 241. a first bootstrap power supply unit; 242. a second bootstrap power supply unit; 243. a third bootstrap power supply unit; 244. a fourth self-lifting power supply unit; 245. a fifth bootstrap power supply unit; 246. a sixth bootstrap power supply unit; 251. a first voltage input terminal; 252. a second voltage output terminal; 253. a phase-entering end; 261. a first resistor; 262. a second resistor; 263. a first energy storage element; 264. a voltage stabilizing device; 265. a first unidirectional conducting electronic device; 300. an IGBT module.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
Fig. 1 is a circuit schematic diagram of an existing bootstrap circuit model provided by an embodiment of the present disclosure. Referring to fig. 1, in a conventional bootstrap circuit model, the bootstrap circuit model includes a voltage input terminal 101, a voltage output terminal 102, an inductance element 111, a diode 121, and a transistor 122; an inductance element 111 and a diode 121 are arranged between the voltage input end 101 and the voltage output end 102, and the conduction direction of the diode 121 is defined as that current flows from the voltage input end 101 to the voltage output end 102; the diode 121 is disposed near the voltage output terminal 102, and the inductance element 111 is disposed between the voltage input terminal 101 and the diode 121.
A first node exists between the inductance element 111 and the diode 121, a transistor 122 is disposed between the first node and the ground terminal 103, and the voltage input terminal 101 charges the inductance element 111 when the transistor 122 is in a conducting state.
The bootstrap circuit model further includes a ground terminal 103, a capacitor element 112 and a resistor element 113, wherein one end of the capacitor element 112 is connected between the diode 121 and the voltage output terminal 102, and the other end of the capacitor element 112 is connected between the transistor 122 and the ground terminal 103; the resistance element 113 is connected in parallel with the capacitance element 112.
After the inductive element 111 is charged, the transistor 122 is switched to the off state, and the inductive element 111 charges the capacitive element 112. When the voltage output terminal 102 is connected to the electric element, the voltage output from the voltage output terminal 102 is equal to the sum of the voltage input terminal 101 and the charging voltage of the capacitor. Thus, the effect of applying a low voltage to the voltage input terminal 101 and obtaining a high voltage at the voltage output terminal 102 is achieved by the bootstrap circuit model. Therefore, in the prior art, the bootstrap circuit model is adopted to solve the boosting problem.
In the power supply circuit provided by the embodiment of the disclosure, a mode that the bootstrap circuit charges the capacitor and charges the capacitor to supply power to the voltage output end is utilized, so that the multiple paths of specific voltages required to be provided in the power supply of the IGBT module are also realized, the scheme of providing the power supply of the multiple paths of specific voltages to the IGBT module through one switching power supply in the prior art is effectively replaced, and the stability and reliability of the power supply are improved.
In the existing scheme of providing a multi-path power supply with specific voltage to an IGBT module through a switching power supply, the circuit design is very complex, when power supply fails, due to the fact that fault finding is difficult due to the complex design, the existing fault is usually solved by adopting a mode of directly replacing the whole power supply module, and therefore the manufacturing cost and the maintenance cost are high in the existing multi-path power supply scheme.
FIG. 2 is a schematic circuit diagram of a power storage module of a power supply circuit provided in an embodiment of the present disclosure;
FIG. 3 is a circuit schematic diagram of a phase-inlet branch according to an embodiment of the present disclosure; FIG. 4 is a circuit diagram of a bootstrap power module of a power supply circuit provided in the embodiment of the present disclosure; fig. 5 is a circuit schematic diagram of a bootstrap power supply unit provided in the embodiment of the present disclosure. With reference to fig. 2 to 5, an embodiment of the present disclosure provides a power supply circuit, which includes an electrical storage module and a bootstrap power supply module; the power storage module is configured to provide a first voltage; the bootstrap power supply module is connected with the power storage module and is configured to output a plurality of second voltages under the driving of the first voltage; the bootstrap power supply module comprises a plurality of bootstrap power supply units; each power supply unit comprises: a first voltage input end 251, a second voltage output end 252, a phase-feed end 253, a first energy storage element 263, a voltage stabilizing device 264, a first resistor 261 and a second resistor 262; a first resistor 261 is arranged between the second voltage output end 252 and the first voltage input end 251; a second resistor 262 is arranged between the phase input end 253 and the second voltage output end 252; the first energy storage element 263 is connected in parallel with the second resistor 262; the voltage regulator device 264 is connected in parallel with the first energy storage element 263 and is configured to limit the storage voltage of the first energy storage element 263.
By adopting the power supply circuit provided by the embodiment of the disclosure, a first voltage can be provided to the bootstrap power supply module through the power storage module of the power supply module, so that the bootstrap power supply module outputs a plurality of second voltages through the input first voltage and the function of a plurality of bootstrap power supply units; each bootstrap power supply unit respectively provides the input first voltage with the second voltage through the charging process of the first energy storage element 263 and the first energy storage element 263 to the second voltage output terminal 252; the charging voltage of the first energy storage element 263 is controlled by the voltage stabilizing device 264 connected in parallel to the two ends of the first energy storage element 263, so that the second voltage output from the first energy storage element 263 to the second voltage output end 252 meets the voltage requirement of the electric device connected with the second energy storage element. Like this, through the effect of the supply circuit that this disclosed embodiment provided, realized to its input commercial power three-phase voltage, can effectively output rather than the required a plurality of second voltages of electrical apparatus of being connected with it. When the electric device is the IGBT module, the plurality of second voltages supply power for the IGBT module, so that the IGBT module can output analog variable frequency signals, the power supply cost of the plurality of second voltages is reduced, and the maintainability of the power supply module is improved.
Optionally, the bootstrap power supply module includes a plurality of bootstrap power supply units; each bootstrap power supply unit is improved on the basis of the bootstrap circuit model, so that a plurality of bootstrap power supply units respectively perform voltage signal processing.
Alternatively, the first energy storage element 263 may be a capacitor. The first energy storage element 263 includes a positive terminal and a negative terminal.
Optionally, the bootstrap power supply unit further includes a first unidirectional conducting electronic device 265, where the first unidirectional conducting electronic device 265 is disposed between the first voltage input end 251 and the second voltage output end 252, and is connected in series with the first resistor 261; the conduction direction of the first unidirectional conduction electronic device 265 is defined as the current flowing from the first voltage input 251 to the second voltage output 252.
Optionally, the power storage module comprises a second energy storage element 230, the second energy storage element 230 being arranged to store the first voltage. The second energy storage element 230 may be a battery element.
Optionally, the power storage module further includes a plurality of phase-inlet branches, and the plurality of phase-inlet branches are respectively connected to the second energy storage element 230 and configured to provide the storage voltage to the second energy storage element 230, so that the second energy storage element 230 can provide the first voltage to the bootstrap power supply module.
The electric power storage module can be a transformer, and can be directly connected with three-phase power of a mains supply, so that the mains supply directly provides input voltage for the electric power storage module.
Optionally, the number of the phase inlet branches may be three, and voltage input ends of the three phase inlet branches may be respectively connected to three phases of the mains supply. As the three-phase power of the mains supply belongs to three-phase alternating current, the phase difference between all the voltages is 120 degrees. Therefore, the input voltage of each phase inlet branch is at a time lower than the neutral point voltages of the three phase inlet branches, and the frequency and the duration of the input voltage of each phase inlet branch being low relative to the neutral point voltages of the three phase inlet branches are substantially equal.
In this way, the phase inlet branches of the power storage module can alternately charge the second energy storage element 230.
Optionally, each phase-incoming branch includes a switch unit 211, and the switch unit 211 includes a first control terminal 212 and a second control terminal 213; the switching unit 211 is configured to turn on the phase-incoming branch where the switching unit 211 is located if the neutral point voltage input by the first control terminal 212 is lower than the preset voltage threshold and the second control terminal 213 inputs a high level. The switch unit 211 may be a transistor, and the second control terminal 213 of the switch unit 211 may be a base pin of the transistor.
If the number of the phase inlet branches is three, the phase inlet branches comprise a first phase inlet branch 221, a second phase inlet branch 222 and a third phase inlet branch 223; each phase-incoming branch is provided with a switch unit 211, a first control terminal 212 of the switch unit 211 is connected to any one of the three phases of mains power, and when the phase voltage of the phase-incoming branch is lower than the neutral point voltage of the three phase-incoming branches, an Input/Output (I/O) port on the first chip can be controlled to Input a high level to a second control terminal 213, that is, a base pin PA0, and at this time, the second energy storage element 230 provides the first voltage to the power supply circuit.
Optionally, each phase incoming branch further includes a second unidirectional conducting electronic device, and the second unidirectional conducting electronic device is disposed between the phase incoming end 253 of the phase incoming branch and the switch unit 211. The conducting direction of the second unidirectional conducting electronic device is defined as the current flowing from the phase-inlet terminal 253 to the switching unit 211.
Fig. 6 is a schematic structural diagram of a frequency conversion apparatus according to an embodiment of the present disclosure. As shown in fig. 6, an embodiment of the present disclosure provides a frequency conversion apparatus, which includes a phase-change power supply 100, an IGBT module 300, and the power supply circuit 200 as described above; phase change power supply 100 is configured to provide a voltage to phase-in terminal 253 of power supply circuit 200; the IGBT module 300 is configured to provide the analog variable frequency voltage driven by the plurality of second voltages output by the power supply circuit 200.
Alternatively, the phase-change power supply 100 is a three-phase power supply, and the three-phase power supply drives the power supply circuit 200 to output a plurality of second voltages.
Optionally, the frequency conversion apparatus further includes a first chip, where the first chip includes at least three I/O ports, which may be a first I/O port, a second I/O port, and a third I/O port. Wherein the first I/O port may be connected with the base pin PA0 of the first switching unit, the second I/O port may be connected with the base pin PA1 of the second switching unit, and the third I/O port may be connected with the base pin PA2 of the third switching unit.
Alternatively, in the case that the input voltage of the first control terminal 212 of the switching unit corresponding to the I/O port of the first chip is lower than the neutral point voltage of the three phase incoming branches, the I/O port of the first chip to which the base pin of the switching unit corresponding to the first control terminal 212 whose control voltage is low is connected inputs a high level.
In practical applications, the power storage module of the power supply circuit 200 may include three phase-incoming branches, and the bootstrap power supply module of the power supply circuit 200 includes six bootstrap power supply units. Here, the three phase inlet branches include a first phase inlet branch 221, a second phase inlet branch 222, and a third phase inlet branch 223; the six bootstrap power supply units include a first bootstrap power supply unit 241, a second bootstrap power supply unit 242, a third bootstrap power supply unit 243, a fourth bootstrap power supply unit 244, a fifth bootstrap power supply unit 245 and a sixth bootstrap power supply unit 246; the mains three-phase power comprises a first phase power input R, a second phase power input S and a third phase power input T. The phase electrical input ends of the first phase inlet branch 221, the second phase inlet branch 222 and the third phase inlet branch 223 are respectively connected with the first phase electrical input R, the second phase electrical input S and the third phase electrical input T; the positive terminals of the first energy storage elements of the first bootstrap power supply unit 241, the second bootstrap power supply unit 242, and the third bootstrap power supply unit 243 are respectively connected to the first phase electrical input R, the second phase electrical input S, and the third phase electrical input T of the three-phase power of the utility power. The switching units 211 of each phase-incoming branch are respectively a first switching unit, a second switching unit and a second switching unit.
When the first phase electrical input R is low relative to the neutral point voltage of the three phase-incoming branches, the phase electrical input acts on the first control terminal of the first switch unit, and then the first I/O port of the first chip is triggered to input a high level to the base terminal PA0 of the first switch unit. And under the condition that the second control end of the first switch unit inputs high level, the first switch unit is in a conducting state.
When the first switch unit is in the on state, the voltages of the negative electrode side of the second energy storage element 230 and the first phase electrical input R are substantially the same and are low voltages, at this time, the second energy storage element 230 provides a first voltage to the first bootstrap power supply unit 241 of the bootstrap power supply module, and the first voltage is applied to the first bootstrap power supply unit 241 from the first voltage input end 251 and charges the first energy storage element of the first bootstrap power supply unit 241. Here, in the case of supplying power to the 18-way matrix arrangement IGBT module 300, preferably, at this time, the first voltage may be 24 volts.
Optionally, the negative terminal of the first energy storage element of the first bootstrap power supply unit 241 is connected to the first phase electrical input R, and the negative terminal of the first energy storage element of the second bootstrap power supply unit 242 is connected to the second phase electrical input S; the negative terminal of the first energy storage element of the third bootstrap power supply unit 243 is connected to the third phase power input T.
Under the condition that the voltage of the first phase electrical input R is low relative to the neutral point voltage of the three phase-incoming branches, for the bootstrap power supply module, because the negative electrode end of the first energy storage element of the first bootstrap power supply unit 241 is connected to the first phase electrical input R, at this time, the negative electrode end of the first energy storage element of the first bootstrap power supply unit 241 is at a low voltage. The negative end of the first energy storage element of the second bootstrap power supply unit 242 is connected to the second phase electrical input S, and the negative end of the first energy storage element of the third bootstrap power supply unit 243 is connected to the third phase electrical input T. Since the conduction directions of the first unidirectional conduction electronic device of the second bootstrap power-supplying unit 242 and the first unidirectional conduction electronic device of the third bootstrap power-supplying unit 243 are limited, at this time, the first unidirectional conduction electronic device of the second bootstrap power-supplying unit 242 and the first unidirectional conduction electronic device of the third bootstrap power-supplying unit 243 are not conducted.
Under the condition that the first unidirectional conducting electronic device of any bootstrap power supply unit is not conducting, the first energy storage element 263 of the bootstrap power supply unit is not charged. Therefore, in the case that the first phase electrical input R is low relative to the neutral point voltage of the three phase-incoming branches, the first energy storage element of the second bootstrap supply unit 242 and the first energy storage element of the third bootstrap supply unit 243 are not charged.
Optionally, the voltage regulator device of the first bootstrap power supply unit 241 is connected in parallel to two ends of the first energy storage element, and therefore, the charging voltage of the first energy storage element 263 is defined as the second voltage associated with the voltage regulator device 264. Here, in the case of supplying power to the 18-way matrix arrangement IGBT module 300, preferably, at this time, the second voltage may be 15 volts.
Fig. 7 is a schematic circuit diagram of an IGBT module 300 according to an embodiment of the present disclosure. As shown in fig. 7, the IGBT module 300 includes 18 IGBT cells arranged in a matrix.
As shown in fig. 7, the 18 matrix arrangement units include a first IGBT unit Q1, a second IGBT unit Q2, a third IGBT unit Q3, a fourth IGBT unit Q4, a fifth IGBT unit Q5, a sixth IGBT unit Q6, a seventh IGBT unit Q7, an eighth IGBT unit Q8, a ninth IGBT unit Q9, a tenth IGBT unit Q10, an eleventh IGBT unit Q11, a twelfth IGBT unit Q12, a thirteenth IGBT unit Q13, a fourteenth IGBT unit Q14, a fifteenth IGBT unit Q15, a sixteenth IGBT unit Q16, a seventeenth IGBT unit Q17, and an eighteenth IGBT unit Q18.
When the first phase electrical input R is low relative to the neutral point voltage of the three phase-incoming branches, the first energy storage element of the first bootstrap power supply unit 241 charges, and since the first energy storage element is connected in parallel with the voltage regulator device 264, the charging voltage of the first energy storage element 263 is determined according to the specification of the voltage regulator device 264. Alternatively, to provide the second voltage of 15 volts, the voltage stabilization device 264 connected in parallel with the first energy storage element 263 may be configured as a voltage stabilization device 264 capable of stabilizing the first energy storage element 263 at 15 volts.
Optionally, the second voltage output terminal of the first bootstrap power supply unit 241 is connected with the first IGBT unit Q1, the seventh IGBT unit Q7, and the thirteenth IGBT unit Q13 of the IGBT module 300; a second voltage output terminal of the second bootstrap power supply unit 242 is connected with a third IGBT unit Q3, a ninth IGBT unit Q9, and a fifteenth IGBT unit Q15 of the IGBT module 300; a second voltage output terminal of the second bootstrap power supply unit 242 is connected with the fifth IGBT cell Q5, the eleventh IGBT cell Q11, and the seventeenth IGBT cell Q17 of the IGBT module 300.
Therefore, in case the first phase electrical input R is low with respect to the neutral point voltage of the three phase incoming legs, the first bootstrap supply unit 241 provides the first IGBT cell Q1, the seventh IGBT cell Q7 and the thirteenth IGBT cell Q13 of the IGBT module 300 with the second voltage of 15 volts.
A second voltage output terminal of the fourth self-lifting power supply unit 244 is connected with the second IGBT unit Q2, the fourth IGBT unit Q4 and the sixth IGBT unit Q6 of the IGBT module 300; a second voltage output terminal of the fifth bootstrap power supply unit 245 is connected with the eighth IGBT unit Q8, the tenth IGBT unit Q10, and the twelfth IGBT unit Q12 of the IGBT module 300; a second voltage output terminal of the sixth bootstrap power supply unit 246 is connected with the fourteenth IGBT cell Q14, the sixteenth IGBT cell Q16, and the eighteenth IGBT cell Q18 of the IGBT module 300.
Optionally, each IGBT unit includes at least a first input terminal, wherein the first input terminal of each IGBT unit is connected to the second voltage output terminal 252 of the power supply unit. If the second voltage of the first bootstrap power supply outputs a voltage, the first, seventh and thirteenth IGBT cells Q1, Q7 and Q13 are in a turn-on state.
Alternatively, the first IGBT unit Q1 is connected in series with one end of the second IGBT unit Q2, and when the first IGBT unit Q1 is turned on, since the phase change input terminal U to which the fourth self-lifting power supply unit 244 is connected to the other end of the second IGBT unit Q2, the phase change input terminal U is communicated with the first phase electrical input R via the second IGBT unit Q2 and the first IGBT unit Q1; at this time, the voltage of the phase change input end U is substantially the same as the first phase electrical input R, that is, at this time, the voltage of the phase change input end U is also lower than the neutral point voltage of the three phase-entering branches; that is, when first IGBT cell Q1 is on, phase change input terminal U is also at a low voltage.
Since the phase change input terminal U is a phase electric input of the fourth self-lifting power supply unit 244, the second energy storage element 230 provides a first voltage for the fourth power supply unit of the bootstrap power supply module, and the fourth self-lifting power supply unit 244 charges the first energy storage element of the fourth self-lifting power supply unit 244 under the driving of the first voltage.
Optionally, the negative end of the first energy storage element of the fourth self-lifting power supply unit 244 is connected to the phase change input terminal U, and the negative end of the first energy storage element of the fifth bootstrap power supply unit 245 is connected to the phase change input terminal V; the negative terminal of the first energy storage element of the sixth bootstrap power supply unit 246 is connected to the phase change input terminal W.
Because the voltage of the phase change input end U is basically consistent with the first phase electric input R, the voltage of the first phase electric input R is low relative to the neutral point voltage of the three phase incoming branches; therefore, the negative terminal of the first energy storage element of the fourth self-lifting power supply unit 244 is at a low voltage.
At this time, the negative terminal of the first energy storage element of the fifth bootstrap power supply unit 245 is connected to the phase change input terminal V; the negative end of the first energy storage element of the sixth bootstrap power supply unit 246 is connected to the phase change input end W, and the phase change input end U is low voltage relative to the phase change input end V and the phase change input end W; at this time, the first unidirectional conducting electronic device of the fifth bootstrap power-supplying unit 245 and the first unidirectional conducting electronic device of the sixth bootstrap power-supplying unit 246 are not conducting. That is, at this time, the first energy storage element of the fifth bootstrap power supply unit 245 and the first energy storage element of the sixth bootstrap power supply unit 246 are not charged.
Therefore, in case the voltage at phase change input U substantially coincides with first phase electrical input R, which is low with respect to the neutral point voltage of the three phase incoming legs, fourth self-lifting power supply unit 244 provides a second voltage of 15 volts to second IGBT cell Q2, fourth IGBT cell Q4 and sixth IGBT cell Q6 of IGBT module 300.
Similarly, in case the second phase electrical input S is low with respect to the neutral point voltage of the three phase incoming legs, the second bootstrap power unit 242 provides a second voltage of 15 volts for the third IGBT unit Q3, the ninth IGBT unit Q9 and the fifteenth IGBT unit Q15 of the IGBT module 300. In case the third phase electrical input T is low with respect to the neutral point voltage of the three phase incoming legs, the third bootstrap power supply unit 243 supplies a second voltage of 15 volts to the fifth, eleventh and seventeenth IGBT units Q5, Q11 and Q17 of the IGBT module 300.
Similarly, in the case that the voltage at the phase change input terminal V is a low voltage, the fifth bootstrap power supply unit 245 provides a second voltage of 15V for the eighth IGBT cell Q8, the tenth IGBT cell Q10, and the twelfth IGBT cell Q12 of the IGBT module 300. In the case where the voltage of the phase change input terminal W is a low voltage, the sixth bootstrap power supply unit 246 provides a second voltage of 15 volts to the fourteenth IGBT cell Q14, the sixteenth IGBT cell Q16, and the eighteenth IGBT cell Q18 of the IGBT module 300.
In this way, the power storage module of the power supply module supplies a first voltage to the bootstrap power supply module, so that the bootstrap power supply module outputs a plurality of second voltages by the input first voltage through the actions of the plurality of bootstrap power supply units; each bootstrap power supply unit respectively provides the input first voltage with the second voltage through the charging process of the first energy storage element 263 and the first energy storage element 263 to the second voltage output terminal 252; the charging voltage of the first energy storage element 263 is controlled by the voltage stabilizing device 264 connected in parallel to the two ends of the first energy storage element 263, so that the second voltage output from the first energy storage element 263 to the second voltage output end 252 meets the voltage requirement of the electric device connected with the second energy storage element. Thus, through the effect of the power supply circuit 200 provided by the embodiment of the present disclosure, the three-phase voltage of the utility power is input to the power supply circuit, that is, a plurality of second voltages required by the electrical appliances connected to the power supply circuit can be effectively output. When the electric device is the IGBT module 300, the plurality of second voltages supply power to the IGBT module 300, so that the IGBT module 300 can output analog variable frequency signals, power supply costs of the plurality of second voltages are reduced, and maintainability of the power supply module is improved.
The embodiment of the disclosure provides an electric device, which comprises the frequency conversion device. The electric equipment can be intelligent household appliances such as an air conditioner, a television and the like, and also can be terminal equipment such as mobile equipment, vehicle-mounted equipment and the like, and any combination thereof. In some embodiments, the mobile device may include, for example, a cell phone, a smart home device, a wearable device, a smart mobile device, a virtual reality device, and the like, or any combination thereof.
Optionally, the electrical device is an air conditioner. The frequency conversion device is arranged in a power supply structure of the compressor, so that the switching-on state of 300 IGBT units of the IGBT module is controlled to realize the frequency regulation of the output analog variable frequency voltage, and the control of the rotating speed of the compressor is realized. The power supply circuit 200 adopted in the frequency conversion device comprises an electric storage module and a bootstrap power supply module; the power storage module is configured to provide a first voltage; the bootstrap power supply module is connected with the power storage module and is configured to output a plurality of second voltages under the driving of the first voltage; the bootstrap power supply module comprises a plurality of bootstrap power supply units; each power supply unit comprises: a first voltage input end 251, a second voltage output end 252, a phase-feed end 253, a first energy storage element 263, a voltage stabilizing device 264, a first resistor 261 and a second resistor 262; a first resistor 261 is arranged between the second voltage output end 252 and the first voltage input end 251; a second resistor 262 is arranged between the phase input end 253 and the second voltage output end 252; the first energy storage element 263 is connected in parallel with the second resistor 262; the voltage regulator device 264 is connected in parallel with the first energy storage element 263 and is configured to limit the storage voltage of the first energy storage element 263. Therefore, the realization cost of the analog variable frequency voltage output is reduced, the circuit design of the voltage output is simplified, and the maintainability of the variable frequency device in the air conditioner is improved.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A power supply circuit, comprising:
an electric storage module configured to provide a first voltage;
a bootstrap power supply module connected to the power storage module and configured to output a plurality of second voltages driven by the first voltage;
the bootstrap power supply module comprises a plurality of bootstrap power supply units; each of the bootstrap power supply units includes:
a first voltage input terminal;
a first resistor is arranged between the second voltage output end and the first voltage input end;
a second resistor is arranged between the phase input end and the second voltage output end;
the first energy storage element is connected with the second resistor in parallel;
a voltage stabilization device connected in parallel with the first energy storage element and configured to define a storage voltage of the first energy storage element.
2. The power supply circuit of claim 1, wherein the bootstrap power supply unit further comprises:
the first unidirectional conduction electronic device is arranged between the first voltage input end and the second voltage output end and is connected with the first resistor in series; the conduction direction of the first unidirectional conduction electronic device is defined as the current flowing from the first voltage input end to the second voltage output end.
3. The power supply circuit according to claim 2, wherein the power storage module includes:
a second energy storage element configured to store a first voltage.
4. The power supply circuit according to claim 3, wherein the power storage module further comprises:
a plurality of phase-inlet branches connected to the second energy storage element and configured to provide a storage voltage to the second energy storage element.
5. The power supply circuit of claim 4, wherein each of said phase-advancing branches comprises:
the switch unit comprises a first control end and a second control end;
the switching unit is configured to: and if the neutral point voltage input by the first control end is lower than a preset voltage threshold and the second control end inputs a high level, the phase-entering branch where the switch unit is located is conducted.
6. A frequency conversion apparatus, comprising:
the power supply circuit of any one of claims 1 to 5;
a phase change power supply configured to provide a voltage to a phase input of the power supply circuit;
an IGBT module configured to provide an analog variable frequency voltage driven by a plurality of second voltages output by the power supply circuit.
7. The frequency conversion apparatus according to claim 6, wherein the phase-change power source is a three-phase power source, and the three-phase power source drives the power supply circuit to output a plurality of second voltages.
8. The frequency conversion device of claim 7, wherein the IGBT module comprises 18 matrix-arranged IGBT cells.
9. An electric device, characterized in that it comprises a frequency conversion device according to any one of claims 6 to 8.
10. The electrical device of claim 9, wherein the electrical device is an air conditioner.
CN202110563754.8A 2021-05-24 2021-05-24 Power supply circuit, frequency conversion device and electric equipment Pending CN113410978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110563754.8A CN113410978A (en) 2021-05-24 2021-05-24 Power supply circuit, frequency conversion device and electric equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110563754.8A CN113410978A (en) 2021-05-24 2021-05-24 Power supply circuit, frequency conversion device and electric equipment

Publications (1)

Publication Number Publication Date
CN113410978A true CN113410978A (en) 2021-09-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110563754.8A Pending CN113410978A (en) 2021-05-24 2021-05-24 Power supply circuit, frequency conversion device and electric equipment

Country Status (1)

Country Link
CN (1) CN113410978A (en)

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