CN111934532B - Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner - Google Patents
Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner Download PDFInfo
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
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- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention provides a control method of a voltage-multiplying rectification PFC circuit, the voltage-multiplying rectification PFC circuit and a variable-frequency air conditioner, wherein the method comprises the following steps: acquiring a main power supply current value; determining a preset current interval where the main power supply current value is located; acquiring a chopping wave reference value according to a preset current interval where the main power supply current value is located; calculating a target chopping parameter according to the chopping reference value and the main power supply current value; and controlling the voltage-multiplying rectification PFC circuit to carry out chopping control according to the target chopping parameters. According to the control method of the voltage-multiplying rectification PFC circuit, the preset current interval is set, and control parameters such as chopping control starting time, chopping pulse period and duty ratio are obtained according to the preset pulse number, so that chopping control of a chopper circuit is achieved, the current waveform is close to the voltage waveform, and the power factor is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a voltage-multiplying rectification PFC circuit, the voltage-multiplying rectification PFC circuit and a variable-frequency air conditioner.
Background
At present, in a 110V Power supply system, there are two common schemes for an inverter air conditioner, one is a scheme of directly performing voltage-multiplying rectification, and the other is a scheme of using an active PFC (Power Factor Correction) technology, where the active PFC technology performs Power Factor Correction while increasing output voltage.
For example, a converter for converting an alternating voltage into a direct voltage is used, and a reactor and a forced conduction circuit of a switching element for forcibly short-circuiting and conducting the reactor and the alternating power supply are connected in series on the power supply side of the converter, whereby the power factor of the power supply is controlled by short-circuiting and conducting, and the power factor is corrected by selecting an appropriate actual time and short-circuiting time. For another example, the active PFC control method includes outputting a first chopper signal with a fixed on-off time after a zero-crossing signal, and calculating a duty ratio D of a second chopper signal to be (I/I0 × k) × (V/V0 × k)/k, where I represents a current operating current, V represents a current motor speed, V0 represents a reference motor speed, I0 represents a reference operating current, and k represents a reference duty ratio value corresponding to the reference operating current and the reference motor speed, and continuously outputting third and fourth chopper signals with a fixed duration in order to improve harmonic current characteristics.
However, the direct voltage-doubling rectification has the disadvantages that the power factor is too low, and the harmonic current cannot meet the standard authentication requirement; although the harmonic current of the active PFC technique can satisfy the standard certification requirement, the loss is large, and the solution cost and the EMC (battery Compatibility command) countermeasure cost are high. The conversion device is adopted, because the inductance of the used reactor is larger, the cost and the electric loss are increased, the abnormal sound of the reactor occasionally exists, and the harmonic current can not be ensured to meet the certification requirement, as shown in fig. 1, the working single pulse current waveform schematic diagram is shown, wherein n1 is a current pulse waveform, the harmonic characteristic is improved by adopting an active PFC control method, but the calculation of the duty ratio D has the defect, the duty ratio is in direct proportion to the rotating speed V and the current I of the compressor, when the load of the compressor is obviously changed, the output power of the compressor is obviously changed, the current I is synchronously changed, the change is not linear, and the change of the duty ratio D and the current I given by the scheme is linear and has control deviation.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for controlling a voltage-doubler rectification PFC circuit, which can make harmonic current meet requirements, and has simple control and high reliability.
The second objective of the present invention is to provide a voltage-doubling rectification PFC circuit.
The third purpose of the invention is to provide an inverter air conditioner.
In order to achieve the above object, a first embodiment of the present invention provides a method for controlling a voltage-doubler rectification PFC circuit, where the method includes: acquiring a main power supply current value; determining a preset current interval in which the main power supply current value is located; acquiring a chopping wave reference value of a preset current interval where the main power supply current value is located; calculating a target chopping parameter according to the chopping reference value and the main power supply current value; and controlling the voltage-multiplying rectification PFC circuit to carry out a chopper circuit according to the target chopping parameter.
According to the control method of the voltage-doubling rectifying PFC circuit, the preset current intervals are set, the chopping reference value corresponding to each preset current interval is prestored, the chopping reference value is a parameter under a better harmonic wave or an optimal harmonic wave current expression, based on the chopping reference values, the preset current interval where the obtained main power supply current value is located is determined during control, the chopping reference value of the preset interval where the main power supply current value is located is obtained, the target chopping parameter is obtained according to the chopping reference value and the main power supply current value, the chopping circuit of the voltage-doubling rectifying circuit is controlled through the target chopping parameter, chopping control of the chopping circuit is realized, and therefore the better harmonic wave current expression can be obtained, the current waveform is close to the voltage waveform, waveform distortion is reduced, the power factor is improved, the purpose of reducing harmonic wave components is achieved, and the current meets the authentication requirement, compared with the common control method of the PFC circuit, the control is simple and the reliability is high.
In some embodiments, obtaining the chopping reference value according to the preset current interval where the main power supply current value is located includes: acquiring a current reference value of a preset current interval where the main power supply current value is located; and obtaining a chopping start time reference value, a chopping cycle reference value and a chopping duty ratio reference value corresponding to the current reference value according to the current reference value, obtaining a chopping reference value corresponding to the current reference value by obtaining the current reference value of a preset current interval, and providing data support for obtaining a target chopping parameter.
In some embodiments, calculating the target chopping parameter according to the preset current interval where the main power supply current value is located and the chopping start time reference value, the chopping cycle reference value, and the chopping duty cycle reference value, and the main power supply current value includes: obtaining a target initial time value according to a chopping initial time reference value corresponding to a current reference value of a preset current interval in which the main power supply current value is located; obtaining a target starting time value according to the main power supply current value, the current reference value and a chopping starting time reference value corresponding to the current reference value; and obtaining a target chopping duty ratio according to the main power supply current value, the current reference value and a chopping duty ratio reference value corresponding to the current reference value, obtaining a target chopping parameter through the chopping reference value and the main power supply current, and providing data support for controlling a chopper circuit of the voltage-multiplying rectification PFC circuit.
In some embodiments, obtaining the target chopping cycle according to a chopping cycle reference value corresponding to a current reference value at which the main power supply current value is in a preset current interval includes: determining the chopping cycle reference value corresponding to the current reference value of the preset current interval where the main power supply current value is located as the target chopping cycle; or determining that a chopping cycle reference value of a first chopping signal corresponding to a current reference value of a preset current interval where the main power supply current value is located is a target chopping cycle of the first chopping signal corresponding to the main power supply current, and calculating a target chopping cycle of a y-th chopping signal corresponding to the main power supply current according to the following formula: t iswyx＝Tw1x*|cos(θy) L, where Tw1xChopping control is carried out on the reference chopping period value T of the first chopping signal in the xth preset current interval corresponding to the main power supply currentwyxFor the target chopping period of its y-th chopping signal, thetayThe y-th chopping pulse corresponds to a power supply phase, wherein x and y are both natural numbers greater than zero.
In some embodiments, the waveform correction, θ, is performed only for the first half of the power frequency half-wave, taking into account the hysteresis of the inductory∈(0，90)；Or, the waveform of the first half part and the second half part of the power frequency half-wave is corrected, but the hysteresis of the inductor is considered, the chopping pulse number of the second half part can be less than that of the first half part, y is m + n, n is less than or equal to m, wherein m chopping pulses correspond to the power supply phase and satisfy thetamE (0, 90), n chopping pulses corresponding to power supply phases satisfying thetanE (90, 180); or y is m + n, n is less than or equal to m, wherein m chopping pulses correspond to the power supply phase and satisfy thetamE (0, 90), n chopping pulses corresponding to power supply phases satisfying thetanE (90, 180), wherein the power phase corresponding to the m +1 th chopping pulse and the power phase corresponding to the main power supply current meet the following conditions: thetas＝90–θm+1+ s, wherein θm+1And (4) the (m + 1) th chopping pulse corresponds to the power supply phase, s is a correction value, and s is more than or equal to 0.
In some embodiments, obtaining a target chopping cycle from the main power supply current value, the current reference value, and a chopping start time reference value corresponding to the current reference value includes: the calculation formula of the target starting time value is as follows: t is0＝(T0x-T0(x-1))/α+T0(x-1)(ii) a Wherein, T0Is a target starting time value, x is a preset current interval ordinal number, T0xChopping start time reference value, T, for the x-th preset current interval0(x-1)A chopping start time reference value of a preset current interval (x-1), alpha is Iac/Ax，IacFor the main supply current, AxAnd the current reference value is the current reference value of the preset current interval where the main power supply current value is located.
In some embodiments, obtaining a target chopping duty cycle from the main supply current value, the current reference value, and a chopping duty cycle reference value corresponding to the current reference value includes: the calculation formula of the target chopping duty ratio is as follows: delta is deltaxα; wherein α ═ Iac/AxDelta is the target chopping duty cycle deltaxIs the chopping duty cycle reference value.
In some embodiments, the control method further comprises: obtaining the q-axis current and the rotating speed of a motor of the voltage-multiplying rectification PFC circuit driving motor; and obtaining the target chopping duty ratio according to the q-axis current of the motor, the rotating speed of the motor and the chopping duty ratio reference value.
In some embodiments, the target chopping duty cycle and the motor q-axis current, the motor speed, and the chopping duty cycle reference value satisfy the following relationship: delta is deltax(1+ (Δ K), wherein Δ K ═ Ki-Ki-1，K＝iqω; where δ is the target chopping duty cycle, δxFor the chopping duty cycle reference value, KiIs the value of K at the current time, Ki-1The control method can perform real-time control for the K value of the previous period, and improves the control stability.
In order to achieve the above object, a second embodiment of the present invention provides a voltage-doubler rectification PFC circuit, including: the device comprises a reactor, a rectifying circuit, a chopper circuit and an inverter circuit; and the controller is connected with the chopper circuit and used for controlling the chopper circuit according to the control method of the voltage-multiplying rectification PFC circuit in the embodiment.
According to the voltage-multiplying rectification PFC circuit provided by the embodiment of the invention, the controller is connected with the chopper circuit and is used for controlling the chopper circuit according to the control method of the voltage-multiplying rectification PFC circuit mentioned in the embodiment, namely, a corresponding chopping reference value is obtained through a preset current interval where a main power supply current value is located, a target chopping parameter is obtained according to the chopping reference value and the main power supply current value, and the chopper circuit of the voltage-multiplying rectification circuit is controlled through the target chopping parameter, namely, the target chopping parameter is obtained by carrying out parameter adjustment on the chopping reference value, so that chopping control of the chopper circuit is realized, the current waveform is close to the voltage waveform, and waveform distortion is reduced, so that the power factor is improved, the purpose of reducing harmonic components is achieved, the current meets the authentication requirement, and compared with a common control method of the PFC circuit, the control is simple and the reliability is high.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides an inverter air conditioner, including: the voltage-multiplying rectification PFC circuit comprises a motor, a current detection unit and the voltage-multiplying rectification PFC circuit, wherein the current detection unit is used for detecting the value of a main power supply current, and the voltage-multiplying rectification PFC circuit is respectively connected with the current detection unit and the motor.
According to the variable frequency air conditioner provided by the embodiment of the invention, the voltage-multiplying rectification PFC circuit is respectively connected with the current detection unit and the motor, namely, parameter adjustment is carried out on the chopping reference value to obtain the target chopping parameter, chopping control of the chopping circuit is realized, the current waveform is close to the voltage waveform, and waveform distortion is reduced, so that the power factor is improved, the aim of reducing harmonic components is fulfilled, and the current meets the authentication requirement.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a related art single pulse current waveform;
fig. 2 is a schematic diagram of a circuit configuration of a voltage-doubler rectifier circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of a voltage-doubler rectification PFC circuit according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit of a transform unit according to one embodiment of the invention;
FIG. 5 is a schematic diagram of a multi-pulse current waveform according to one embodiment of the present invention;
fig. 6 is a block diagram of an inverter air conditioner according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In an embodiment, the control method of the voltage-doubling rectification PFC circuit is based on the voltage-doubling rectification PFC circuit, which is briefly described first.
Fig. 2 is a schematic diagram of a circuit structure of a voltage-doubler rectifier circuit according to an embodiment of the present invention. The voltage-multiplying rectification circuit comprises a reactor such as L01, a rectification circuit V05-V08, an alternating voltage detection unit V01, a chopper circuit G01 behind L01 and a driving circuit thereof, a diversion circuit V01-V04 for avoiding reverse conduction of the chopper circuit G01, and an inversion driving unit for driving the permanent magnet synchronous motor to run at the later stage, wherein when an input power supply signal is in a positive half cycle, the C01-V05-C01 charges the C01, when the input power supply signal is in a negative half cycle, the C02-V06-L01 charges the C02, the C01 and the C02 are connected in series to carry out voltage multiplication, and the later stage inversion driving unit is powered.
The control method for the voltage-doubling rectification PFC circuit provided by the embodiment of the invention is based on the voltage-doubling rectification circuit shown in FIG. 2, and is used for controlling a chopping signal output by the chopper circuit, namely, a preset current interval is set, target chopping parameters corresponding to main power supply current values falling into different preset current intervals are obtained, corresponding chopping control is carried out on the voltage-doubling rectification PFC circuit according to the target chopping parameters, so that harmonic current meets the standard requirement, and the setting of the preset current interval is explained below.
The main power supply current value IacAccording to the magnitude of current value A1、A2、…AnExtracting n typical values, wherein 0<A1<A2<…<AnN is a natural number, AnSetting a current interval for the typical value of the maximum working current value according to the extracted typical value of the current, for example, presetting the current interval 1 as [0 (A)1+A2) A preset current interval 2 to n are sequentially [ (A)1+A2)/2，(A2+A3)/2)、...、[(An-1+An)/2，(3*An-An-1) /2) at rated voltage Vac0Under the conditions, each current A was tested1、A2、…AnThe initial chopping reference value of the harmonic current obtained by the method, wherein the initial chopping reference value is such as the initial chopping turn-off time ToxChopper cycle reference value TwxAnd chopping duty ratio reference value deltax，x＝2，3，…And n, wherein x represents a current interval in which the initial chopping reference value is located, at least 2 chopping cycles exist in each power frequency half cycle, but the number of the chopping cycles does not exceed 10 at most, and the purpose is to limit the chopping frequency to be in a lower value, reduce switching loss, reduce EMI interference and facilitate the utilization of low-cost low-frequency devices.
By comparing the main power supply current value I acquired in real timeacAnd determining the interval to realize chopping control of the current.
A control method of a voltage-doubler rectification PFC circuit according to an embodiment of the first aspect of the present invention is described below with reference to fig. 3 to 5.
As shown in fig. 3, the control method of the voltage-doubler rectification PFC circuit according to the embodiment of the present invention at least includes steps S1 to S5.
In step S1, a main power supply current value is acquired.
In the embodiment, as shown in fig. 2, during the operation of the inverter air conditioner, the main power supply loop detection unit outputs the main power supply current signal I in real timeac01Since the controller, such as the MCU05, is connected to the main power supply loop detection unit, the controller obtains the main power supply current value output by the main power supply loop detection unit in real time, such as Iac。
Step S2, determining a preset current interval in which the main power supply current value is located.
In an embodiment, the controller obtains the main supply current value I since each main supply current value is already divided according to a preset current intervalacThen, the main current supply value I is outputtedacPerforming appropriate chopping control by first determining main power supply current value IacSpecifically, which preset current interval falls into, and the controller performs corresponding chopping control in different preset current intervals.
And step S3, acquiring a chopping wave reference value according to the preset current interval where the main power supply current value is located.
In an embodiment, a main supply current value I is determinedacThe preset current interval is, for example, current interval 2 where the main power supply current value is located is determined according to the magnitude of the main power supply current value, that is, x is 2, and chopping waves corresponding to each preset interval are adoptedThe reference parameters are different, and when x is 2, the initial chopping reference value, such as chopping turn-off time, is acquired as To2The reference value of the chopping period is Tw2And the chopping duty ratio reference value is delta2。
Step S4, a target chopping parameter is calculated from the chopping reference value and the main power supply current value.
In an embodiment, the main supply current value IacAnd when the current interval is in different preset current intervals, the obtained chopping reference value is different, for example, when the main power supply current value is in the current interval 2, the target chopping parameter is obtained according to the specific relation between the chopping reference value and the main power supply current value.
And step S5, controlling the voltage-multiplying rectification PFC circuit to carry out chopping control according to the target chopping parameters.
In an embodiment, the target chopping parameter is obtained by performing parameter correction on a chopping reference value of the main supply current value, and the chopping current of the voltage-doubling rectifying circuit is adjusted according to the target chopping parameter, that is, the chopping off time, the chopping period and the chopping duty ratio of the chopping signal are adjusted through the target chopping parameter.
According to the control method of the voltage-doubling rectifying PFC circuit, the preset current intervals are set, the chopping reference value corresponding to each preset current interval is prestored, the chopping reference value is a parameter under a better harmonic wave or an optimal harmonic wave current expression, based on the chopping reference values, the preset current interval where the obtained main power supply current value is located is determined during control, the chopping reference value of the preset interval where the main power supply current value is located is obtained, the target chopping parameter is obtained according to the chopping reference value and the main power supply current value, the chopping circuit of the voltage-doubling rectifying circuit is controlled through the target chopping parameter, namely, the target chopping parameter is obtained by adjusting the chopping reference value, the chopping control of the chopping circuit is realized, the better harmonic wave current expression can be obtained, the current waveform is close to the voltage waveform, the waveform distortion is reduced, and the power factor is improved, and harmonic components are reduced, so that the current meets the authentication requirement, and compared with a common control method of a PFC circuit, the control method is simple and high in reliability.
In some embodiments, as shown in fig. 4, a circuit diagram of a transform unit according to an embodiment of the present invention is shown. During harmonic optimization control, a positive half period of a power supply signal conducts a chopper tube G01, an inductor L01 is charged through L01-V03-G01-V02, G01 is disconnected after a preset time, such as chopping signal turn-off time, is reached, and a reactor L01 charges C01 through V05; the chopper tube G01 is conducted in the negative half cycle of a power supply signal, the inductor L01 is charged through V04-G01-V01-L01, G01 is disconnected after the preset time is reached, the reactor L01 charges C02 through V06, the power factor of the power supply signal is improved while the output direct-current voltage is promoted, the harmonic characteristic is improved, the purpose of reducing harmonic current components is achieved, the current waveform is close to the voltage waveform, the waveform distortion is reduced, the harmonic current meets the certification requirement, and the overall loss is reduced.
In some embodiments, obtaining the chopping reference value of the preset current interval in which the main power supply current value is located includes obtaining a current reference value of the preset current interval in which the main power supply current value is located; and obtaining a current reference value according to the current reference value of the preset current interval where the main power supply current value is located, and obtaining a chopping start time reference value, a chopping cycle reference value and a chopping duty ratio reference value corresponding to the current reference value.
In an embodiment, the current reference value is obtained according to a preset current interval where the main power supply current value is located, for example, if it is determined that the main power supply current value is within the range of the current interval 2, the obtained current reference value is, for example, marked as a2According to the current reference value A2Obtaining a current reference value A2The lower corresponding chopping start time reference value is To2The reference value of the chopping period is Tw2And the chopping duty ratio reference value is delta2And data support is provided for chopping signal control by obtaining a chopping reference value.
In some embodiments, obtaining the target chopping parameter according to the chopping reference value of the preset current interval in which the main power supply current value is located and the main power supply current value includes obtaining the target chopping period according to a chopping period reference value corresponding to the current reference value of the preset current interval in which the main power supply current value is located, for example, determining that the main power supply current value is located in a current regionIn the range of 3, the current reference value is A3Obtaining a current reference value of A3Corresponding chopping period reference value Tw3Reference value T of the chopping periodw3With a target chopping period T3Keeping consistent, when the main power supply current is in the range of the current interval 1, the chopping reference value does not need to be acquired, the chopping signal is turned off, and the PFC control function is not provided.
Determining a value of a main supply current IacWhen the current is in the range of 3, according to the main power supply current value IacReference value of current A3Chopping start time reference value T corresponding to current reference value03Obtaining a target start time value T0。
When the main power supply current value is determined to be in the range of 3 current intervals, the main power supply current value I is determinedacReference value of current A3And a current reference value A3Corresponding chopping duty ratio reference value delta3A target chopping duty cycle delta is obtained.
By reference value T to the chopping periodw3Chopping start time reference value T03And a chopping duty cycle reference value delta3And adjusting the parameters to obtain target chopping parameters corresponding to the reference values, and realizing circuit control by obtaining the target chopping parameters.
In some embodiments, since the ideal state of the main power supply current value is a pure cosine wave, the cosine wave has a characteristic that the main power supply current value can be regarded as pure linearity in a small range, so that the period can be cosine-processed, obtaining the target chopping period according to the chopping period reference value corresponding to the current reference value of the preset current interval in which the main power supply current value is located includes determining that the chopping period reference value corresponding to the current reference value of the preset current interval in which the main power supply current value is located is the target chopping period, that is, when the main power supply current value is determined to be within the range of the current interval 3, the current reference value is a3Obtaining a current reference value of A3Corresponding chopping period reference value Tw3Reference value T of the chopping periodw3With a target chopping period T3And the consistency is maintained.
Or determining the electricity of the preset current interval in which the main power supply current value is positionedThe chopping cycle reference value of the first chopping signal corresponding to the current reference value is the target chopping cycle of the first chopping signal corresponding to the main power supply current, and when the current interval 2 where the main power supply current value is located is determined, the cycle reference value of the first chopping signal is Tw12And takes it as the target chopping period of the first chopping signal.
And taking the target chopping period of the first chopping signal as a reference, and carrying out the subsequent chopping period TwyxProcessing is carried out, namely a calculation formula of a target chopping period of the y-th chopping signal corresponding to the main power supply current is as follows: t iswyx＝Tw1x*|cos(θy)|，θyThe y-th chopping pulse corresponding to the phase of the power supply, thetayE (0, 180), namely the power supply phase value corresponding to the value point in the switching-on time of the ith chopping signal. Wherein, Tw1xThe target chopping period T of the first chopping signal for chopping control of the xth preset current interval corresponding to the main power supply currentwyxFor the target chopping period of the y-th chopping signal, thetayThe y-th chopping pulse corresponds to a power supply phase, wherein x and y are both natural numbers greater than zero. By processing the subsequent chopping period, the harmonic control effect can be better realized.
In some embodiments, the y chopped pulse waveforms may all be distributed in the first half of the half power frequency signal period, i.e., θyE (0, 90); or y is m + n, n is less than or equal to m, wherein the first half part has m chopping pulses, and the m chopping pulses correspond to the power supply phase and satisfy thetamE (0, 90), the second half part has n chopping pulses, the n chopping pulses correspond to the power phase and satisfy thetan∈(90，180)。
Alternatively, as shown in fig. 5, a diagram of a multi-pulse current waveform according to an embodiment of the present invention is shown. Fig. 5 has 4 chopping waveforms in total, the first half has 3, such as chopping pulse waveforms n11, n12 and n13 in fig. 5, the second half has 1, such as chopping pulse waveform n14, the chopping pulse waveform y is m + n, n is less than or equal to m, wherein m chopping pulses correspond to the power supply phase satisfying thetamE (0, 90), n chopping pulses corresponding to power supply phases satisfying thetanE (90, 180), where the m +1 th chopping pulseThe corresponding power supply phase and the corresponding power supply phase of the main power supply current meet the following conditions: thetas＝90–θm+1+ s, s is a correction value, s is not less than 0, where θm+1The m +1 th chopping pulse corresponds to the phase of the power supply, namely the phase of the first chopping pulse in the back half part is delayed by theta from the phase of the main power supply electric signal by 90 DEGsAnd (4) an angle.
In some embodiments, obtaining the target start time value from the main supply current value, the current reference value, and the chopper start time reference value corresponding to the current reference value includes: t is0＝(T0x-T0(x-1))/α+T0(x-1)(ii) a Wherein, T0Is a target starting time value, x is a preset current interval ordinal number, T0xChopping start time reference value, T, for the x-th preset current interval0(x-1)A chopping start time reference value of a preset current interval (x-1), alpha is Iac/Ax，IacFor main supply current, AxAnd the current reference value is the current reference value of the preset current interval in which the main power supply current value is positioned.
In the embodiment, for example, the main power supply current value is in the current interval 2, and the current reference value a of the preset interval in which the main power supply current is located is obtained2Determining a chopping start time reference value according to the current reference value, and calculating a target chopping turn-off time, namely a target start time value T, through the chopping start time reference value and alpha0＝T02/α-T01/α+T01。
In some embodiments, obtaining the target chopping duty cycle according to the main power supply current value, the current reference value, and the chopping duty cycle reference value corresponding to the current reference value includes, for example, when the main power supply current value is in the current interval 2, obtaining the current reference value a of the preset interval in which the main power supply current is located2Determining a chopping duty cycle reference value delta from the current reference value2And calculating a target chopping duty ratio delta through the chopping duty ratio reference value and alpha, wherein the calculation formula of the target chopping duty ratio delta is as follows: delta is (delta)x-δx-1)*α+δx-1(ii) a Wherein α ═ Iac/AxDelta is the target chopping duty cycle, deltaxFor chopping wavesA duty cycle reference value.
The chopper circuit of the voltage-multiplying rectification PFC circuit is controlled through the obtained target chopping parameters, so that harmonic current can meet the certification requirement well, meanwhile, the overall loss is low, EMI interference is low, the control algorithm is simple, and the cost is low.
In some embodiments, the control method further comprises obtaining a motor q-axis current and a motor speed of the voltage-multiplying rectification PFC circuit driving motor; and obtaining a target chopping duty ratio according to the q-axis current of the motor, the rotating speed of the motor and the chopping duty ratio reference value.
In the embodiment, when the load of the motor at the later stage changes, the main power supply current value I is causedacWhen the load of the rear stage changes, the change is taken as a feedforward signal to participate in control.
In some embodiments, the FOC space vector algorithm is used to obtain the magnitude of the load at the rear stage and the q-axis current i of the motorqIs related to the motor rotating speed omega, and the target chopping duty ratio is related to the motor q-axis current iqThe motor rotating speed omega and the chopping duty ratio reference value meet the following relational expression: delta is deltax(1+ (Δ K), where Δ K ═ Ki-1, and K ═ iqω; where δ is the target chopping duty cycle, δxThe method has the advantages that the chopping duty ratio reference value is adopted, Ki is the K value at the current moment, Ki-1 is the K value in the previous period, the change of the load can be reflected into the control in advance through the correlated feedforward control of the load change, the better real-time control effect is realized, and the control stability is improved.
In summary, according to the control method of the voltage-doubler rectification PFC circuit of the embodiment of the present invention, by setting preset current intervals, and pre-storing chopper reference values corresponding to each preset current interval, the chopper reference values being parameters under better harmonic or optimal harmonic current expression, based on the chopper reference values, during control, determining the preset current interval in which the obtained main power supply current value is located, and obtaining the chopper reference value of the preset interval in which the main power supply current value is located, obtaining the target chopper parameter according to the chopper reference value and the main power supply current value, and controlling the chopper circuit of the voltage-doubler rectification circuit by the target chopper parameter, i.e. performing parameter adjustment on the chopper reference value to obtain the target chopper parameter, the chopper control is implemented, so that the current waveform approaches to the chopper voltage waveform, the waveform distortion is reduced, the power factor is improved, and the harmonic component is reduced, the current meets the authentication requirement, and compared with a common control method of a PFC circuit, the control method is simple and high in reliability.
A voltage-doubler rectification PFC circuit according to an embodiment of the second aspect of the present invention is described below with reference to the drawings.
Fig. 2 is a schematic diagram of a circuit of a voltage-doubler rectification PFC circuit according to one embodiment of the present invention. As shown in fig. 2, a voltage-doubler rectification PFC circuit 20 according to an embodiment of the present invention includes a reactor 21, a rectification circuit 22, a chopper circuit 23, and an inverter circuit 24; the controller 25 is connected to the chopper circuit 23, and is configured to control the chopper circuit 23 by implementing the control method of the voltage-doubler rectification PFC circuit mentioned in the above embodiment.
In the embodiment, as shown in fig. 2, the voltage-doubling rectifying circuit 20 includes a reactor 21, a rectifying circuit 22, and an ac voltage detecting unit V01, which are mainly used for detecting the mains frequency instantaneous voltage and obtaining a zero-crossing signal based on the instantaneous voltage, generally, the midpoint of the positive and negative peak voltages is taken as a zero-crossing point, a chopper circuit G01 and a driving circuit thereof after the reactor 21, a current guiding circuit V01-V04 for avoiding reverse conduction of the chopper circuit G01, and a main power supply loop current detecting unit output current signal Idc01And an inverter driving unit such as a three-phase inverter bridge INV06 for driving the PMSM to operate at a later stage, and generating a three-phase inverter signal to drive the PMSM M to operate, wherein ω is the operating speed of the driving motor output by the inverter circuit 24, iqFor the q-axis current value in the d-q coordinate system of the permanent magnet synchronous motor estimated by the inversion unit based on the traditional FOC algorithm, the controller 25 adopts the traditional well-known space vector algorithm FOC to control the three-phase currents iu, iv and iw of the compressor, estimates the position information psi through a position estimation unit such as PS09 and further obtains the rotating speed information omega, and sits at the rotating d-q coordinate systemCurrent value i in the systemd、iqWherein i isdAs excitation component, iqAs work component, the output power and rotation speed of inverter and work component iqIs proportional to the estimated id、iqPsi and d-axis command values idThe speed command value ω generates three upper bridge driving signals Vuu, Vvu, Vwu and three lower bridge driving signals Vud, Vvd, Vwd of the inverter bridge INV06 in the algorithm control unit K07, thereby generating a three-phase inverter voltage to drive the motor M to operate.
According to the voltage-multiplying rectifying PFC circuit 20 of the embodiment of the present invention, the controller 25 is connected to the chopper circuit 23, and is configured to control the chopper circuit 23 according to the control method of the voltage-multiplying rectifying PFC circuit mentioned in the above embodiment, that is, obtain a corresponding chopping reference value through a preset current interval where the main power supply current value is located, obtain a target chopping parameter according to the chopping reference value and the main power supply current value, and control the chopper circuit of the voltage-multiplying rectifying circuit according to the target chopping parameter, that is, perform parameter adjustment on the chopping reference value to obtain the target chopping parameter, thereby implementing chopping control of the chopper circuit, so as to obtain a better harmonic current expression, make the current waveform approach to the voltage waveform, reduce waveform distortion, and thereby improve the power factor.
An inverter air conditioner according to a third aspect of the present invention will be described with reference to the accompanying drawings.
Fig. 6 is a block diagram of an inverter air conditioner according to an embodiment of the present invention, and as shown in fig. 6, the inverter air conditioner 30 includes a motor 31, a current detection unit 32, and the voltage-doubler rectification PFC circuit 20 mentioned in the above embodiment, the current detection unit 32 is used for detecting a main supply current value, and the voltage-doubler rectification PFC circuit 20 is connected with the current detection unit 32 and the motor 31, respectively.
According to the variable frequency air conditioner 30 of the embodiment of the invention, the voltage-doubling rectification PFC circuit 20 is respectively connected with the current detection unit 32 and the motor 31, namely, parameter adjustment is carried out on a chopping reference value to obtain a target chopping parameter, chopping control of the chopping circuit is realized, so that better harmonic current performance can be obtained, a current waveform is close to a voltage waveform, waveform distortion is reduced, and a power factor is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A control method of a voltage-multiplying rectification PFC circuit is characterized by comprising the following steps:
acquiring a main power supply current value, wherein the main power supply current value is a current value input by an alternating current power supply in a voltage-multiplying rectification PFC circuit;
determining a preset current interval where the main power supply current value is located;
obtaining a chopping reference value according to a preset current interval where the main power supply current value is located, wherein the chopping reference value comprises: the chopping reference value is obtained according to the preset current interval where the main power supply current value is located by the chopping start time reference value, the chopping cycle reference value and the chopping duty ratio reference value, and the chopping reference value comprises the following steps: acquiring a current reference value of a preset current interval where the main power supply current value is located; obtaining the chopping start time reference value, the chopping period reference value and the chopping duty ratio reference value corresponding to the current reference value according to the current reference value;
calculating a target chopping parameter according to the chopping reference value and the main power supply current value, wherein the target chopping parameter comprises: the method comprises the following steps of obtaining a chopping start time reference value, a chopping cycle reference value and a chopping duty ratio reference value according to a preset current interval where a main power supply current value is located, and calculating a target chopping parameter according to the chopping start time reference value, the chopping cycle reference value, the chopping duty ratio reference value and the main power supply current value, wherein the target chopping parameter comprises the following steps: obtaining the target starting time value according to the main power supply current value, the current reference value and a chopping starting time reference value corresponding to the current reference value; obtaining the target chopping period according to a chopping period reference value corresponding to a preset current interval current reference value at which the main power supply current value is located; obtaining the target chopping duty ratio according to the main power supply current value, the current reference value and a chopping duty ratio reference value corresponding to the current reference value;
and controlling a chopper circuit in the voltage-multiplying rectification PFC circuit to carry out chopping control according to the target chopping parameter.
2. The method according to claim 1, wherein obtaining the target chopping cycle according to the chopping cycle reference value corresponding to the current reference value when the main supply current value is in the preset current interval comprises:
determining the chopping cycle reference value corresponding to the current reference value of the main power supply current value in a preset current interval as the target chopping cycle;
or, determining that a reference value of a chopping cycle of a first chopping signal corresponding to a current reference value of the main power supply current value in a preset current interval is a target chopping cycle of a first chopping signal corresponding to the main power supply current value, and calculating a target chopping cycle of a y-th chopping signal corresponding to the main power supply current value according to the following formula: t iswyx＝Tw1x*|cos(θy) L, where Tw1xChopping control is carried out on the first chopping signal chopping period reference value T of the xth preset current interval corresponding to the main power supply current valuewyxFor the target chopping period of its y-th chopping signal, thetayThe y-th chopping pulse corresponds to a power supply phase, wherein x and y are both natural numbers greater than zero.
3. The method of claim 2 wherein the step of controlling the voltage doubler rectifier PFC circuit,
θy∈(0，90)；
or y is m + n, n is less than or equal to m, wherein m chopping pulses correspond to the power supply phase and satisfy thetamE (0, 90), n chopping pulses corresponding to power supply phases satisfying thetan∈(90，180)；
Or y is m + n, n is less than or equal to m, wherein m chopping pulses correspond to the power supply phase and satisfy thetamE (0, 90), n chopping pulses corresponding to power supply phases satisfying thetanE (90, 180), wherein the power phase corresponding to the m +1 th chopping pulse and the power phase corresponding to the main power supply current value meet the following requirements: thetas＝90-θm+1+ s, wherein θm+1For the m +1 th chopping pulse corresponding to the power supply phase, said θsThe value of the main power supply current corresponds to the power phase, s is a correction value, and s is not less than 0.
4. The method for controlling the voltage-doubling rectifying PFC circuit according to claim 1, wherein obtaining a target start time value according to the main power supply current value, the current reference value and a chopping start time reference value corresponding to the current reference value comprises:
the calculation formula of the target starting time value is as follows: t is0＝(T0x-T0(x-1))/α+T0(x-1)；
Wherein, T0Is a target starting time value, x is a preset current interval ordinal number, T0xChopping start time reference value, T, for the x-th preset current interval0(x-1)A chopping start time reference value of a preset current interval (x-1), alpha is Iac/Ax，IacFor the main supply current value, AxAnd the current reference value is the current reference value of the preset current interval in which the main power supply current value is positioned.
5. The method for controlling the voltage-doubling rectifying PFC circuit according to claim 4, wherein obtaining a target chopping duty cycle according to the main power supply current value, the current reference value and a chopping duty cycle reference value corresponding to the current reference value comprises:
the calculation formula of the target chopping duty ratio is as follows: delta is (delta)x-δx-1)*α+δx-1；
Wherein α ═ Iac/AxDelta is the target chopping duty cycle deltaxIs the chopping duty cycle reference value.
6. The method of controlling a voltage doubler rectifier PFC circuit according to claim 1, further comprising:
obtaining the q-axis current and the rotating speed of a motor of the voltage-multiplying rectification PFC circuit driving motor;
and obtaining a target chopping duty ratio according to the q-axis current of the motor, the rotating speed of the motor and the chopping duty ratio reference value.
7. The method for controlling the voltage-doubling rectifying PFC circuit according to claim 6, wherein the target chopping duty cycle, the q-axis current of the motor, the motor speed and the chopping duty cycle reference value satisfy the following relational expression:
δ＝δx(1+ Δ K), wherein Δ K ═ Ki-Ki-1，K＝iq*ω；
Where δ is the target chopping duty cycle, δxFor the chopping duty cycle reference value, KiIs the value of K at the current time, Ki-1Is the K value of the previous period, x is the sequence number of the preset current interval, iqIs the motor q-axis current, and ω is the motor speed.
8. A voltage-multiplying rectifying PFC circuit, comprising:
the device comprises a reactor, a rectifying circuit, a chopper circuit and an inverter circuit;
a controller connected to the chopper circuit for controlling the chopper circuit according to the control method of the voltage-doubler rectification PFC circuit according to any one of claims 1 to 7.
9. An inverter air conditioner, characterized in that, comprising a motor, a current detection unit and the voltage-doubling rectification PFC circuit of claim 8, wherein the current detection unit is used for detecting the value of the main power supply current, and the voltage-doubling rectification PFC circuit is connected with the current detection unit and the motor respectively.
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