CN110541810A - Compressor driving circuit, control method and control device and air conditioner - Google Patents
Compressor driving circuit, control method and control device and air conditioner Download PDFInfo
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- CN110541810A CN110541810A CN201910854610.0A CN201910854610A CN110541810A CN 110541810 A CN110541810 A CN 110541810A CN 201910854610 A CN201910854610 A CN 201910854610A CN 110541810 A CN110541810 A CN 110541810A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Ac Motors In General (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the application provides a compressor driving circuit, a control method, a control device and an air conditioner, relates to the field of air conditioning equipment, and solves the problem that the heating energy consumption of compressor refrigerator oil is high and the heating speed is low before the air conditioner is started. The compressor driving circuit comprises a frequency converter, wherein the frequency converter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of the compressor, and two ends of the capacitor are connected in parallel with a switch; the controller is used for controlling the switch to be switched off before controlling the frequency converter to output a driving signal to the compressor, and outputting a control signal to the frequency converter so that phase voltage output by a phase voltage output end of the frequency converter meets a preset condition, wherein the preset condition comprises the following steps: the start phase of the first phase voltage is advanced by a predetermined period from the start phase of the second phase voltage, and the start phase of the second phase voltage is advanced by a predetermined period from the start phase of the third phase voltage. The method is used for compressor drive circuit control.
Description
Technical Field
the embodiment of the invention relates to the field of air conditioning equipment, in particular to a compressor driving circuit, a control method and a control device and an air conditioner.
Background
With the generalization of the application scene of the air conditioner, the air conditioner needs to heat the refrigerating machine oil before starting the compressor (for short, starting or starting) to ensure the necessary lubricating viscosity of the refrigerating machine oil, and simultaneously prevents the refrigerant from being dissolved in the refrigerating machine oil, so as to avoid the damage to the compressor caused by the fact that the important parameters such as the oil viscosity, the oil pressure and the like cannot be ensured due to the large amount of gasification of the refrigerant in the oil when starting the compressor.
Before the air conditioner is started, the compressor refrigerating machine oil is generally required to be rapidly heated to a higher temperature, and when the heating time of the compressor refrigerating machine oil before the air conditioner is started is too long, the energy consumption is large, the cost is high, and the production efficiency is low. At present, in order to avoid the occurrence of the condition, the main form of taking is to bind one or two crankcase heating strips in compressor oil sump department, carry out the heating of compressor refrigerator oil through external heating strip, the heating strip is circular telegram for a long time and is in the high temperature environment and age easily and cause the short circuit like this, bring the potential safety hazard, and influence user's experience, simultaneously because the used electric heating strip of air conditioner producer exists that the coefficient of heat conductivity is low at present, the heat loss is big, it is high to consume energy, preheat the problem of cycle length, just so be difficult to solve the problem that the heating energy consumption of compressor refrigerator oil is high heating rate is slow before the air conditioner is started.
Therefore, the compressor and the refrigerator oil need to be quickly heated before the air conditioner is started, so that electric energy can be well saved, the waiting starting time of a user is shortened, and meanwhile, the value of the air conditioner and the experience of the user can be improved.
Disclosure of Invention
In order to solve the problem of realizing rapid heating of the compressor refrigerating machine oil before the air conditioner is started, the embodiment of the application provides the driving circuit, the control method and the control device of the compressor, and the air conditioner.
In a first aspect, a compressor driving circuit is provided, which includes a frequency converter, wherein the frequency converter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of a compressor, and switches are connected in parallel at two ends of the capacitor; wherein the controller is used for before controlling the converter to compressor output drive signal, control switch disconnection to converter output control signal, so that the looks voltage output of converter exported satisfies the predetermined condition, wherein, the converter includes three looks voltage output, and first looks voltage output is used for exporting first looks voltage, and second looks voltage output is used for exporting the second phase electricity, and third looks voltage output is used for exporting third phase voltage, and wherein, the predetermined condition includes: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by a preset period. In the prior art, one or two crankcase heating belts are bound at the compressor oil pool before the air conditioner is started to heat the compressor refrigerating machine oil to a higher temperature, so that the heating mode has the disadvantages of higher energy consumption, higher cost and low production efficiency, and the heating belts are electrified for a long time and aged in a high-temperature environment to cause short circuit, thereby easily bringing potential safety hazards and influencing the user experience; in the application, as the capacitor and the switch are additionally arranged between the compressor and the frequency converter, the capacitor is connected between a phase voltage output end of the frequency converter and a port of the compressor in series, and the switch is connected with the capacitor in parallel; thus, before the control frequency converter outputs a driving signal to the compressor, the control switch is switched off, the control signal is output to the frequency converter, if the control signal can control the first phase voltage, the second phase voltage and the third phase voltage output by the phase voltage output end of the frequency converter to be alternating current signals with the same waveform, the initial phase of the first phase voltage is advanced by a preset period compared with the initial phase of the second phase voltage, the initial phase of the second phase voltage is advanced by a preset period compared with the initial phase of the third phase voltage, the capacitor and the coil of the compressor can form an LC resonance circuit, and an oscillation signal is formed in the LC resonance circuit, the process is equivalent to the electromagnetic heating of the refrigerating machine oil to heat the coil of the compressor, the large current injection in a short time is realized, and the problem of high heating energy consumption and low heating speed of the refrigerating machine oil of the compressor before the starting, the waiting time of the user for starting up is reduced, and meanwhile, the value of the air conditioner and the experience of the user are improved. Meanwhile, the coil of the compressor is directly reused for heating the refrigerating machine oil, so that an additional heating device is avoided, and the cost is saved.
in a second aspect, a control method for a compressor driving circuit is provided, the compressor driving circuit includes a frequency converter, wherein the frequency converter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of a compressor, and switches are connected in parallel at two ends of the capacitor; before control converter exports drive signal to the compressor, control switch disconnection to control signal is exported to the converter, so that the looks voltage output of converter satisfies the predetermined condition, wherein, the converter includes three looks voltage output, and first looks voltage output is used for exporting first looks voltage, and second looks voltage output is used for exporting second looks electricity, and third looks voltage output is used for exporting third phase voltage, and wherein, the predetermined condition includes: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by a preset period.
In a third aspect, a control device for a compressor driving circuit is provided, the compressor driving circuit comprises a frequency converter, wherein the frequency converter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of a compressor, and switches are connected in parallel at two ends of the capacitor; the device includes: the first control module is used for controlling the switch to be switched off before controlling the frequency converter to output a driving signal to the compressor; the second control module is used for outputting a control signal to the frequency converter so that phase voltage output by a phase voltage output end of the frequency converter meets a preset condition, wherein the frequency converter comprises three phase voltage output ends, the first phase voltage output end is used for outputting first phase voltage, the second phase voltage output end is used for outputting second phase voltage, the third phase voltage output end is used for outputting third phase voltage, and the preset condition comprises: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by a preset period.
In a fourth aspect, a control device for a compressor driving circuit is provided, the compressor driving circuit includes a frequency converter, wherein the frequency converter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of a compressor, and switches are connected in parallel at two ends of the capacitor; the control device of the compressor driving circuit further includes: a processor and a driving circuit, wherein the processor and the driving circuit are coupled, and the processor is configured to execute instructions to implement the control method of the compressor driving circuit provided by the second aspect.
In a fifth aspect, a storage medium is provided, which stores instructions capable of implementing the control method of the compressor driving circuit provided in the second aspect when the instructions are executed on a computer.
in a sixth aspect, a computer program product is provided, which contains instructions that, when executed on a computer, can implement the control method of the compressor driving circuit provided in the second aspect.
A seventh aspect provides an air conditioner, wherein the inverter is connected to the power supply and the controller, a capacitor is connected in series between a phase voltage output end of the inverter and a port of the compressor, and a switch is connected in parallel to two ends of the capacitor; further comprising control means for the compressor drive circuit as in the third or fourth aspect.
The solutions provided in the second aspect to the seventh aspect include technical features the same as or corresponding to those of the first aspect, and the technical effects achieved by the solutions are similar to those of the first aspect and are not repeated here.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a compressor drive circuit according to an embodiment of the present invention;
Fig. 2 is a schematic diagram illustrating a method for controlling a compressor driving circuit according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of a compressor driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a compressor driving circuit of an air conditioner according to another embodiment of the present invention;
FIG. 5 is a timing diagram of a control signal of an inverter of a compressor driving circuit according to an embodiment of the present invention;
Fig. 6 is a schematic waveform diagram of a phase voltage output terminal of an inverter of a compressor driving circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a square wave voltage difference between U-V, V-W of an inverter of a compressor driving circuit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a square wave voltage difference between U-V, V-W of an inverter of another compressor driving circuit according to an embodiment of the present invention;
Fig. 9 is a schematic structural diagram of a control device of a compressor driving circuit according to an embodiment of the present invention;
Fig. 10 is a schematic structural diagram of a control device of a compressor driving circuit according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The use of the terms first, second, etc. do not denote any order, and the terms first, second, etc. may be interpreted as names of the objects described. In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
before the air conditioner is started, the compressor refrigerating machine oil is generally required to be rapidly heated to a higher temperature, and when the heating time of the compressor refrigerating machine oil before the air conditioner is started is too long, the energy consumption is large, the cost is high, and the production efficiency is low. At present, in order to avoid the occurrence of the condition, the main form of taking is to bind one or two crankcase heating strips in compressor oil sump department, carry out the heating of compressor refrigerator oil through external heating strip, the heating strip is circular telegram for a long time and is in the high temperature environment and age easily and cause the short circuit like this, bring the potential safety hazard, and influence user's experience, simultaneously because the used electric heating strip of air conditioner producer exists that the coefficient of heat conductivity is low at present, the heat loss is big, it is high to consume energy, preheat the problem of cycle length, just so be difficult to solve the problem that the heating energy consumption of compressor refrigerator oil is high heating rate is slow before the air conditioner is started.
in order to solve the above problem, an embodiment of the present application provides a compressor driving circuit of an air conditioner as shown in fig. 1, which specifically includes: an inverter 11, wherein the inverter 11 is connected to a power source 12 and a controller 13, phase voltage output terminals of the inverter 11 (as shown in fig. 1, a three-phase inverter is provided, which includes a phase voltage output terminal (U, V, W) connected in series with a capacitor C between ports (U, V, W) of a compressor 14, two ends of the capacitor C are connected in parallel with a switch K, wherein a capacitor C1 is connected in series between the phase voltage output terminal W and the port W, two ends of a capacitor C1 are connected in parallel with a switch K1, a capacitor C2 is connected in series between the phase voltage output terminal V and the port V, two ends of a capacitor C2 are connected in parallel with a switch K2, a capacitor C3 is connected in series between the phase voltage output terminal U and the port U, two ends of a capacitor C3 are connected in parallel with a switch K3, a first phase voltage output terminal U of the inverter 11 is connected to a U end (a coil S3) of the compressor 14 through the capacitor C3, a second phase voltage output terminal V of the, the third phase voltage output end W of the frequency converter 11 is connected in series with the W end (coil S1) of the compressor 14 through a capacitor C1. Wherein, before controlling the frequency converter 11 to output the drive signal to the compressor 14, the controller 13 is configured to control the switch to be turned off, and output the control signal to the frequency converter 11, so that the phase voltage output by the phase voltage output terminal of the frequency converter 11 satisfies the predetermined condition, wherein, the frequency converter includes three phase voltage output terminals, the first phase voltage output terminal is configured to output the first phase voltage, the second phase voltage output terminal is configured to output the second phase voltage, the third phase voltage output terminal is configured to output the third phase voltage, wherein, the predetermined condition includes: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by a preset period. Illustratively, the predetermined period is 2n π +2 π/3, and n takes the value 0 or a positive integer. The controller 13 is also configured to control the switch to be closed when the inverter 11 is controlled to output a driving signal to the compressor 14.
In the prior art, one or two crankcase heating belts are bound at the compressor oil pool before the air conditioner is started to heat the compressor refrigerating machine oil to a higher temperature, so that the heating mode has the disadvantages of higher energy consumption, higher cost and low production efficiency, and the heating belts are electrified for a long time and aged in a high-temperature environment to cause short circuit, thereby easily bringing potential safety hazards and influencing the user experience; in the application, as the capacitor and the switch are additionally arranged between the compressor and the frequency converter, the capacitor is connected between a phase voltage output end of the frequency converter and a port of the compressor in series, and the switch is connected with the capacitor in parallel; thus, before the control frequency converter outputs a driving signal to the compressor, the control switch is switched off, the control signal is output to the frequency converter, if the control signal can control the first phase voltage, the second phase voltage and the third phase voltage output by the phase voltage output end of the frequency converter to be alternating current signals with the same waveform, the initial phase of the first phase voltage is advanced by a preset period compared with the initial phase of the second phase voltage, the initial phase of the second phase voltage is advanced by a preset period compared with the initial phase of the third phase voltage, the capacitor and the coil of the compressor can form an LC resonance circuit, and an oscillation signal is formed in the LC resonance circuit, the process is equivalent to the electromagnetic heating of the refrigerating machine oil to heat the coil of the compressor, the large current injection in a short time is realized, and the problem of high heating energy consumption and low heating speed of the refrigerating machine oil of the compressor before the starting, the waiting time of the user for starting up is reduced, and meanwhile, the value of the air conditioner and the experience of the user are improved. Meanwhile, the coil of the compressor is directly reused for heating the refrigerating machine oil, so that an additional heating device is avoided, and the cost is saved.
In one embodiment, the frequency converter 11 includes three sets of bridges, wherein a control signal is used to control an upper bridge arm and a lower bridge arm on each bridge to be periodically turned on, wherein the upper bridge arm and the lower bridge arm are sequentially turned on for a predetermined time in one period; the control signal is also used for controlling the upper bridge arm of the first bridge to be started in advance of a preset period compared with the upper bridge arm of the second bridge and controlling the upper bridge arm of the second bridge to be started in advance of a preset period compared with the upper bridge arm of the third bridge, wherein the first bridge is used for outputting a first phase voltage, the second bridge is used for outputting a second phase voltage, and the third bridge is used for outputting a third phase voltage. As shown in fig. 1, the frequency converter 11 includes three bridges of six Insulated Gate Bipolar Transistors (IGBTs) M1-M6, wherein a diode is connected in series between an emitter (e) and a collector (c) of each IGBT, an emitter of an exemplary M1 is connected to an anode of D1, a collector of M1 is connected to a cathode of D1, a similar D2 is connected in series between the emitter (e) and the collector (c) of M2, D3 is connected in series between the emitter (e) and the collector (c) of M3, D4 is connected in series between the emitter (e) and the collector (c) of M4, D5 is connected in series between the emitter (e) and the collector (c) of M5, and D6 is connected in series between the emitter (e) and the collector (c) of M6. In addition, M1 and M4 are connected in series between the positive pole and the negative pole of the power supply 12 to form a first bridge, the collector of M1 is connected with the positive pole of the power supply 12, the bases of M1 and M4 are connected with the driving board N, the emitter of M1 is connected with the collector of M4, the emitter of M4 is connected with the negative pole of the power supply 12, and the emitter of M1 is connected with the first phase voltage output end U of the frequency converter 11. Similarly, M2 and M5 are connected in series between the positive pole and the negative pole of the power supply 12 to form a second bridge, the collector of M2 is connected to the positive pole of the power supply 12, the bases of M2 and M5 are connected to the driving board N, the emitter of M2 is connected to the collector of M5, the emitter of M5 is connected to the negative pole of the power supply 12, and the emitter of M2 is connected to the second phase voltage output terminal V of the frequency converter 11. M3 and M6 are connected in series between the positive pole and the negative pole of the power supply 12 to form a third bridge, the collector of M3 is connected with the positive pole of the power supply 12, the bases of M3 and M6 are connected with the driving board N, the emitter of M3 is connected with the collector of M6, the emitter of M6 is connected with the negative pole of the power supply 12, and the emitter of M3 is connected with the third phase voltage output end W of the frequency converter 11. The first bridge comprises an upper bridge arm and a lower bridge arm, wherein when the M1 on the upper bridge arm is conducted under the control of a control signal input by a base (b) of the upper bridge arm, the upper bridge arm is considered to be opened, and similarly, when the M4 on the lower bridge arm is conducted under the control of a control signal input by a base (b) of the lower bridge arm, the lower bridge arm is considered to be opened, and the working principles of the other two bridges are similar. In the normal working state of the air conditioner, the switches K1-K3 are closed to short-circuit the capacitors C1-C3, so that the frequency converter 11 outputs driving signals (six paths of PWM signals, wherein each path of PWM signal is correspondingly output to the base of one IGBT) at the controller 13; as shown in fig. 1, the controller may be in the form of a main control board M and a driving board N, where the control board M outputs a logic signal to the driving board N, and the driving board N is controlled to output a driving signal to the inverter according to the logic signal, so as to control the voltage output ends of the phase voltages of the inverter 11 to output voltages, thereby driving the compressor 14 to operate normally. The driving signals include six signals corresponding to six IGBTs, respectively, and of course, in some schemes, the base of the IGBT is also called the gate (g), the emitter (e) is also called the source(s), and the collector is also called the drain (d). In addition, the controller 13 may employ a logic processing circuit in the form of a Central Processing Unit (CPU), a microprocessor or Micro Control Unit (MCU), a field-programmable gate array (FPGA), or the like.
While the embodiment provided by the present application mainly occurs before the air conditioner starts (i.e., before the inverter 11 outputs the driving signal to the compressor 14 under the control of the controller 13). Referring to fig. 2, the principle of the present application is explained as follows: when the refrigerating machine oil of the compressor needs to be heated, the controller controls the switch to be switched off, when the controller outputs a control signal to the frequency converter, the PWM signal output by the controller controls the IGBT switch in the frequency converter to be switched on and switched off, so that the square wave voltage output by the first phase voltage output end, the second voltage output end and the third voltage output end of the frequency converter flows into an LC resonance circuit formed by the capacitor and the coil of the compressor, the square wave voltage is increased, and the electromagnetic heating on the coil of the compressor is realized.
an embodiment of the present application provides a control method of a compressor driving circuit shown in fig. 1, and as shown in fig. 3, the method includes the steps of:
101. before the control frequency converter outputs a driving signal to the compressor, the control switch is disconnected.
102. And outputting a control signal to the frequency converter so that the phase voltage output by the phase voltage output end of the frequency converter meets a preset condition.
Wherein, the converter includes three looks voltage output, and first looks voltage output is used for exporting first looks voltage, and second phase voltage output is used for exporting second phase electricity, and third phase voltage output is used for exporting third phase voltage, and wherein, the predetermined condition includes: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by a preset period.
In the prior art, one or two crankcase heating belts are bound at the compressor oil pool before the air conditioner is started to heat the compressor refrigerating machine oil to a higher temperature, so that the heating mode has the disadvantages of higher energy consumption, higher cost and low production efficiency, and the heating belts are electrified for a long time and aged in a high-temperature environment to cause short circuit, thereby easily bringing potential safety hazards and influencing the user experience; in the application, as the capacitor and the switch are additionally arranged between the compressor and the frequency converter, the capacitor is connected between a phase voltage output end of the frequency converter and a port of the compressor in series, and the switch is connected with the capacitor in parallel; thus, before the control frequency converter outputs a driving signal to the compressor, the control switch is switched off, the control signal is output to the frequency converter, if the control signal can control the first phase voltage, the second phase voltage and the third phase voltage output by the phase voltage output end of the frequency converter to be alternating current signals with the same waveform, the initial phase of the first phase voltage is advanced by a preset period compared with the initial phase of the second phase voltage, the initial phase of the second phase voltage is advanced by a preset period compared with the initial phase of the third phase voltage, the capacitor and the coil of the compressor can form an LC resonance circuit, and an oscillation signal is formed in the LC resonance circuit, the process is equivalent to the electromagnetic heating of the refrigerating machine oil to heat the coil of the compressor, the large current injection in a short time is realized, and the problem of high heating energy consumption and low heating speed of the refrigerating machine oil of the compressor before the starting, the waiting time of the user for starting up is reduced, and meanwhile, the value of the air conditioner and the experience of the user are improved. Meanwhile, the coil of the compressor is directly reused for heating the refrigerating machine oil, so that an additional heating device is avoided, and the cost is saved.
In addition, the frequency converter includes three sets of bridges, and step 102 specifically includes: controlling the upper bridge arm and the lower bridge arm on each bridge to be opened periodically, wherein the upper bridge arm and the lower bridge arm are opened for a preset time in sequence in one period; and controlling the upper bridge arm of the first bridge to be started in advance of the upper bridge arm of the second bridge by a preset period, and controlling the upper bridge arm of the second bridge to be started in advance of the upper bridge arm of the third bridge by the preset period, wherein the first bridge is used for outputting a first phase voltage, the second bridge is used for outputting a second phase voltage, and the third bridge is used for outputting a third phase voltage. Illustratively, the predetermined period is 2n π +2 π/3, and n takes the value 0 or a positive integer. Referring to fig. 4, an embodiment of the present application provides a compressor driving circuit of the air conditioner, and when the refrigerating machine oil of the compressor needs to be heated when the method provided by the embodiment of the present application is performed, the control switches K1-K3 are turned off on the basis of fig. 1. Referring to FIG. 5, a control signal using PWM signals is provided, where U + represents the PWM signal input to the base of M1, the duration of U + represents the duration of M1 for which M1 is continuously conducting, U-represents the PWM signal input to the base of M4, and the duration of U-represents the duration of M4 for which M1 is continuously conducting, where M1 is not conducting at the U input and M4 is not conducting at the U + input. V + represents the PWM signal input to the base of M2, the duration of V + represents the duration of M2 continuous conduction, V-represents the PWM signal input to the base of M5, and the duration of V-represents the duration of M5 continuous conduction, wherein M2 is not conducted when V-is input, and M5 is not conducted when V + is input. W + represents the PWM signal input to the base of M3, the duration of W + represents the duration of M3 continuous conduction, W-represents the PWM signal input to the base of M6, and the duration of W-represents the duration of M6 continuous conduction, wherein M3 is not conducted when W-is input, and M6 is not conducted when W + is input. When the control signal waveform shown in fig. 5 is adopted, referring to fig. 6, waveforms of three phase voltage output ends (U, V, W) of the frequency converter are provided, wherein the square wave voltage of the output end U of the first phase voltage, the output end V of the second phase voltage and the output end W of the third phase voltage is shown in fig. 6, in the legend, the waveform phase of U is advanced by 2 pi/3 than that of V, and the waveform phase of V is advanced by 2 pi/3 than that of W. When no capacitance is added, the square wave voltage difference between the phase voltage output terminals U-V, V-W of the frequency converter is small, as shown in FIG. 7 for the square wave voltage difference between U-V, V-W. In the application, due to the fact that the capacitor is added, the voltage difference of the square waves between the U-V, V-W can be increased due to the boosting effect of the capacitor, for example, the U phase is used, when the K3 is disconnected, the square wave voltage output by the U phase can flow into the compressor coil S3, the capacitor C3 and the coil S3 form an LC resonance circuit, the square wave of the coil can be boosted, and due to the fact that the internal resistance of the coil is unchanged, the power of the square wave voltage input with the same power on the coil is increased, and therefore more heat is generated. For example, referring to fig. 4, when refrigerating machine oil of a compressor is heated, under a control timing, a controller sends a control signal to an inverter, an upper arm of a first bridge is turned on, and a lower arm of a second bridge and a lower arm of a third bridge are turned on, and simultaneously a switch is turned off, so that a square wave voltage Vin output from an output end of a phase voltage U of the first bridge arm in the inverter flows into a coil S3 of the compressor through a capacitor C3, and since the coil S3 and the capacitor C3 of the compressor form an LC resonant circuit, the resonant circuit can raise the square wave voltage Vin to Vout, referring to fig. 8, at this time, Vout is aVin, a > 1, so that large current injection is realized in a short time, and the refrigerating machine oil of the compressor can be heated quickly.
Referring to fig. 9, an embodiment of the present invention further provides a control device of the compressor driving circuit shown in fig. 1, configured to implement the control method corresponding to the embodiment shown in fig. 2, where the control device is specifically applied to an air conditioner, and the control device may be a controller itself or a chip on the controller, and specifically includes:
And the first control module 61 is used for controlling the switch to be switched off before controlling the frequency converter to output the driving signal to the compressor.
A second control module 62, configured to output a control signal to the frequency converter, so that the phase voltage output by the phase voltage output terminal of the frequency converter satisfies a predetermined condition, where the frequency converter includes three phase voltage output terminals, a first phase voltage output terminal is configured to output a first phase voltage, a second phase voltage output terminal is configured to output a second phase voltage, and a third phase voltage output terminal is configured to output a third phase voltage, where the predetermined condition includes: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by a preset period.
in addition, the first control module 61 is further configured to control the switch to be closed when the inverter is controlled to output the driving signal to the compressor.
Optionally, the second control module 62 may be configured to determine the predetermined period of the phase voltage of the inverter to be 2 π/3.
Optionally, the second control module 62 is further specifically configured to control the upper bridge arm and the lower bridge arm of each bridge to be periodically turned on, where the upper bridge arm and the lower bridge arm are sequentially turned on for a predetermined time in one period; and controlling the upper bridge arm of the first bridge to be started in advance of the upper bridge arm of the second bridge by a preset period, and controlling the upper bridge arm of the second bridge to be started in advance of the upper bridge arm of the third bridge by the preset period, wherein the first bridge is used for outputting a first phase voltage, the second bridge is used for outputting a second phase voltage, and the third bridge is used for outputting a third phase voltage.
The technical problems that can be solved by the control device of the compressor driving circuit and the technical effects that can be realized can refer to the description of the control method of the compressor driving circuit, and are not repeated herein.
In another scheme, the first control module 61 of the control device of the compressor driving circuit may be implemented by using one or more processors, and the second control module 62 may be implemented by using a driving circuit; referring to fig. 10, there is provided a control device of a compressor driving circuit for an air conditioner, the control device including: a processor 91 and a driving circuit 92, wherein the processor 91 is coupled to the driving circuit 92, and the processor 91 is configured to execute instructions to implement the control method of the frequency converter. The exemplary driver circuit 92, processor 91 may be coupled by a bus 93.
The processor 91 may be a general processing unit (CPU), a controller MCU, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs according to the present disclosure.
Of course, the processor 91 may also be integrated with a storage means for computer programs or instructions for executing the control method of the frequency converter, or the storage means may be provided separately, for example, as shown in fig. 10, the memory 94 may be provided separately. The memory 94 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
The drive circuit 92 is used to send control signals to the frequency converter under the control of the processor 91.
The embodiment of the present invention further provides a storage medium, which stores instructions, and when the instructions are executed on a computer, the control method of the compressor driving circuit provided in the above embodiment can be implemented.
embodiments of the present invention further provide a computer program product, where the computer program product includes instructions, and when the instructions are executed on a computer, the method for controlling a compressor driving circuit according to the above embodiments can be implemented.
The embodiment of the invention also provides an air conditioner, which comprises a compressor, the compressor driving circuit and a controller, wherein the compressor driving circuit comprises a frequency converter, the frequency converter is connected with a power supply and the controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of the compressor, two ends of the capacitor are connected in parallel with a switch, and the controller is the control device of the compressor driving circuit provided by the embodiment.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the methods of the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. A compressor driving circuit is characterized by comprising an inverter, wherein the inverter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the inverter and a port of a compressor, and switches are connected in parallel at two ends of the capacitor;
the controller is configured to control the switch to be turned off and output a control signal to the inverter before controlling the inverter to output a driving signal to the compressor, so that a phase voltage output by a phase voltage output terminal of the inverter satisfies a predetermined condition, where the inverter includes three phase voltage output terminals, a first phase voltage output terminal is configured to output a first phase voltage, a second phase voltage output terminal is configured to output a second phase voltage, and a third phase voltage output terminal is configured to output a third phase voltage, where the predetermined condition includes: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by the preset period.
2. The compressor driving circuit according to claim 1, wherein the inverter comprises three sets of bridges, wherein the control signal is used to control upper and lower arms of each bridge to be periodically turned on, wherein the upper and lower arms are sequentially turned on for a predetermined time period in one period;
The control signal is further used for controlling the upper bridge arm of the first bridge to be started in advance of the predetermined period compared with the upper bridge arm of the second bridge, and controlling the upper bridge arm of the second bridge to be started in advance of the predetermined period compared with the upper bridge arm of the third bridge, wherein the first bridge is used for outputting the first phase voltage, the second bridge is used for outputting the second phase voltage, and the third bridge is used for outputting the third phase voltage.
3. A compressor drive circuit according to claim 1 or 2, wherein the predetermined period is 2n pi +2 pi/3, n taking the value 0 or a positive integer.
4. the compressor drive circuit of claim 1, wherein the controller is further configured to control the switch to close when the inverter is controlled to output a drive signal to the compressor.
5. The control method of the compressor driving circuit is characterized in that the compressor driving circuit comprises a frequency converter, wherein the frequency converter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of the compressor, and two ends of the capacitor are connected in parallel with a switch;
Before controlling the frequency converter to output a driving signal to the compressor, controlling the switch to be switched off;
outputting a control signal to the frequency converter so that phase voltages output by phase voltage output ends of the frequency converter meet a predetermined condition, wherein the frequency converter comprises three phase voltage output ends, a first phase voltage output end is used for outputting a first phase voltage, a second phase voltage output end is used for outputting a second phase voltage, and a third phase voltage output end is used for outputting a third phase voltage, wherein the predetermined condition comprises: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by the preset period.
6. The control method of a compressor drive circuit according to claim 5, wherein the inverter includes three sets of bridges;
Outputting a control signal to the frequency converter so that a phase voltage output by a phase voltage output end of the frequency converter meets a preset condition, wherein the control signal comprises the following steps:
outputting a control signal to the frequency converter, and controlling an upper bridge arm and a lower bridge arm on each bridge to be periodically started, wherein the upper bridge arm and the lower bridge arm are sequentially started for a preset time in one period; and controlling the upper bridge arm of the first bridge to be started in advance of the preset period compared with the upper bridge arm of the second bridge, and controlling the upper bridge arm of the second bridge to be started in advance of the preset period compared with the upper bridge arm of the third bridge, wherein the first bridge is used for outputting the first phase voltage, the second bridge is used for outputting the second phase voltage, and the third bridge is used for outputting the third phase voltage.
7. The control method of a compressor driving circuit according to claim 5 or 6, wherein the predetermined period is 2n pi +2 pi/3, and n takes a value of 0 or a positive integer.
8. The control method of a compressor driving circuit according to claim 5,
And when the frequency converter is controlled to output a driving signal to the compressor, the switch is controlled to be closed.
9. The control device of the compressor driving circuit is characterized in that the compressor driving circuit comprises a frequency converter, wherein the frequency converter is connected with a power supply and a controller, a capacitor is connected in series between a phase voltage output end of the frequency converter and a port of the compressor, and two ends of the capacitor are connected in parallel with a switch; the device includes:
the first control module is used for controlling the switch to be switched off before controlling the frequency converter to output a driving signal to the compressor;
the second control module is configured to output a control signal to the frequency converter, so that phase voltages output by phase voltage output terminals of the frequency converter satisfy a predetermined condition, where the frequency converter includes three phase voltage output terminals, a first phase voltage output terminal is configured to output a first phase voltage, a second phase voltage output terminal is configured to output a second phase voltage, and a third phase voltage output terminal is configured to output a third phase voltage, where the predetermined condition includes: the first phase voltage, the second phase voltage and the third phase voltage are alternating current signals with the same waveform, the initial phase of the first phase voltage is ahead of the initial phase of the second phase voltage by a preset period, and the initial phase of the second phase voltage is ahead of the initial phase of the third phase voltage by the preset period.
10. The control device of a compressor drive circuit according to claim 9, wherein the inverter includes three sets of bridges;
The second control module is specifically configured to control an upper bridge arm and a lower bridge arm on each bridge to be periodically started, where the upper bridge arm and the lower bridge arm are sequentially started for a predetermined time in one period; and controlling the upper bridge arm of the first bridge to be started in advance of the preset period compared with the upper bridge arm of the second bridge, and controlling the upper bridge arm of the second bridge to be started in advance of the preset period compared with the upper bridge arm of the third bridge, wherein the first bridge is used for outputting the first phase voltage, the second bridge is used for outputting the second phase voltage, and the third bridge is used for outputting the third phase voltage.
11. the control device of a compressor driving circuit according to claim 9 or 10, wherein the predetermined period is 2n pi +2 pi/3, and n takes a value of 0 or a positive integer.
12. the control apparatus of the compressor driving circuit according to claim 9, wherein the first control module is further configured to control the switch to be closed when the inverter is controlled to output the driving signal to the compressor.
13. an air conditioner, comprising a compressor, a compressor driving circuit according to any one of claims 1 to 4, and a controller, wherein the compressor driving circuit comprises an inverter, wherein the inverter is connected to a power supply and the controller, a capacitor is connected in series between a phase voltage output terminal of the inverter and a port of the compressor, a switch is connected in parallel to both ends of the capacitor, and the controller comprises a control device of the compressor driving circuit according to any one of claims 9 to 12.
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