CN105391294A - Control device and method for power factor corrector - Google Patents
Control device and method for power factor corrector Download PDFInfo
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- CN105391294A CN105391294A CN201510412633.8A CN201510412633A CN105391294A CN 105391294 A CN105391294 A CN 105391294A CN 201510412633 A CN201510412633 A CN 201510412633A CN 105391294 A CN105391294 A CN 105391294A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The invention discloses a control device and method for a power factor corrector, and the device comprises a zero-crossing detection module which is used for detecting the voltage of an input power supply, so as to sample a voltage zero-crossing signal; a voltage detection module which is used for detecting a DC voltage of an output end in real time after a load operates; and a control module which is used for obtaining a DC reference voltage of the output end, calculating the voltage difference between a DC voltage and the DC reference voltage, adjusting the voltage difference so as to output an adjustment parameter, controlling a power switching tube to be connected according to the voltage zero-crossing signal, and obtaining the connection time and intervals of at least two-time on/off of the power switching tube in a half power period according to the adjustment parameter, so as to control the power switching tube. The device can control the DC voltage of the output end to linearly change along with the voltage amplitude of the input power supply only if the voltage zero-crossing signal and the DC voltage are detected, and can greatly reduce the harmonic content of an input current.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of control device of power factor corrector and a kind of control method of power factor corrector.
Background technology
Current power factor adjuster (PowerFactorCorrection, PFC) mainly takes passive type PFC (PassivePFC) and active PFC (ActivePFC) two schemes.
Wherein, the advantage of passive type PFC is that cost is low, reliability is high, but its power factor correction is limited, and particularly when input power is large, DC bus-bar voltage is fallen obvious.Active PFC is mainly divided into again full PFC and partial PFC two kinds of modes, the effect of full PFC is best, power factor can reach more than 99%, the harmonic content of electric current also can suppress below 10%, and output voltage stabilization, but owing to employing high-frequency inductor and high-speed power device, its maximum deficiency is exactly EMI (electromagnetic interference, ElectromagneticInterference is called for short EMI) issue handling is cumbersome, design of filter is complicated, cost is high, the high-frequency inductor cost simultaneously itself used is also higher, and control also complicated in addition, debugging difficulty is large, and in existing partial PFC control program, switching speed is slower, switching loss is lower, generation electromagnetic interference is few, but relatively full PFC is higher for modulated current harmonic content, and in existing partial PFC control program, all to detect input voltage zero crossing, inductive current, output dc voltage, control chip is by input voltage crossover point signal and inductive current, the mode of operation of load control circuit and output PWM (PulseWidthModulation, pulse-width modulation) duty ratio of pulse signal, thus control inputs current following input voltage and regulation output voltage, control relative load, need sampling parameter many, take control chip resource.
Therefore, need to improve partial PFC control technology.
Summary of the invention
The present invention is intended to solve one of technical problem in above-mentioned technology at least to a certain extent.For this reason, one object of the present invention is the control device proposing a kind of power factor corrector, these two parameters of direct voltage only needing to detect voltage over zero signal and output just can the direct voltage of control output end with the voltage magnitude linear change of input power, and greatly can reduce the harmonic content of input current.
Another object of the present invention is the control method proposing a kind of power factor corrector.
For achieving the above object, the control device of a kind of power factor corrector that one aspect of the present invention embodiment proposes, comprise: zero passage detection module, described zero passage detection module is used for the voltage of the input power of detection power factor corrector with sampled voltage crossover point signal, voltage detection module, described voltage detection module is used for the direct voltage of the output detecting described power factor corrector after the load running of the output of described power factor corrector in real time, control module, described control module is connected with described voltage detection module with described zero passage detection module respectively, described control module is for obtaining the DC reference voltage of the output of described power factor corrector, and the voltage difference calculated between the direct voltage of described output and described DC reference voltage, and regulate with Drazin inverse parameter to described voltage difference, and the power switch pipe of described control module also in power factor corrector according to described voltage over zero signal controlling starts open-minded, and obtain the service time of described power switch pipe at least twice switch in half power cycle according to described regulating parameter and open interval, to control described power switch pipe.
According to the control device of the power factor corrector of the embodiment of the present invention, by the direct voltage of the output of zero passage detection module samples crossover point signal and voltage detection module detection power factor corrector, control module calculates the voltage difference between the direct voltage of output and the DC reference voltage of acquisition, and regulate with Drazin inverse parameter to voltage difference, then start open-minded according to the power switch pipe in voltage over zero signal controlling power factor corrector, and obtain the service time of power switch pipe at least twice switch in half power cycle according to regulating parameter and open interval, to control power switch pipe, so only need these two parameters of direct voltage being detected output by zero passage detection module samples voltage over zero signal and voltage detection module, control module just can the direct voltage of control output end with the voltage magnitude linear change of input power, and according to service time of power switch pipe at least twice switch in half power cycle obtained with open interval and control power switch pipe, improve the harmonic content of input current, guarantee meets corresponding harmonic standard requirement.
According to one embodiment of present invention, described voltage detection module also for detecting the initial DC voltage of described output before the load startup optimization of described output, and described control module also obtains described DC reference voltage according to the initial DC voltage of described output.
According to one embodiment of present invention, described control module specifically calculates the voltage peak of described input power according to the initial DC voltage of described output, and the voltage peak of described input power is multiplied by predetermined coefficient to obtain described DC reference voltage.
Wherein, described predetermined coefficient is 0.8-0.9.
According to one embodiment of present invention, the on-off times of described power switch pipe in half power cycle is twice, the one-to-one relationship table of the pulse angle of regulating parameter and the power switch pipe pulse angle opened of second time and twice shutoff is preset with, the time interval that described control module obtains the first time service time of described power switch pipe in half power cycle, second time service time according to described regulating parameter and described one-to-one relationship table and opens for twice in described control module.
According to one embodiment of present invention, described power factor corrector is semi-initiative type active power factor corrector, described semi-initiative type active power factor corrector specifically comprises: a PFC inductance, and described one end of a PFC inductance is held with the L of described input power and is connected; First bridge circuit, the first end of described first bridge circuit is connected with the other end of a described PFC inductance, and the second end of described first bridge circuit is held with the N of described input power and is connected; First power switch pipe IGBT1, the E pole of described first power switch pipe IGBT1 is connected with the 3rd end of described first bridge circuit, the C pole of described first power switch pipe IGBT1 is connected with the 4th end of described first bridge circuit, and the G pole of described first power switch pipe IGBT1 is connected with described control module; Second bridge circuit, the first end of described second bridge circuit is held with the N of described input power and is connected, second end of described second bridge circuit is connected with the other end of a described PFC inductance, and the 3rd end of described second bridge circuit and the 4th end are as the output of described power factor corrector; First filter capacitor, described first filter capacitor is connected in parallel between the 3rd end of described second bridge circuit and the 4th end.
According to another embodiment of the invention, described power factor corrector is semi-initiative type active power factor corrector, described semi-initiative type active power factor corrector specifically comprises: the 3rd bridge circuit, the described first end of the 3rd bridge circuit is held with the N of described input power and is connected, and described second end of the 3rd bridge circuit is held with the L of described input power and is connected; 2nd PFC inductance, one end of described 2nd PFC inductance is connected with the 4th end of described 3rd bridge circuit; Described first diode, the anode of described first diode is connected with the other end of described 2nd PFC inductance; Second power switch pipe IGBT2, the E pole of described second power switch pipe IGBT2 is connected with the 3rd end of described 3rd bridge circuit, the C pole of described second power switch pipe IGBT2 is connected with the anode of described first diode with the other end of described 2nd PFC inductance respectively, and the G pole of described second power switch pipe IGBT2 is connected with described control module; Second filter capacitor, described second filter capacitor is connected in parallel between the negative electrode of described first diode and the E pole of described second power switch pipe IGBT2, and the two ends of described second filter capacitor are as the output of described power factor corrector.
For achieving the above object, the control method of a kind of power factor corrector that the present invention's another aspect embodiment proposes, comprises the following steps: the voltage of the input power of detection power factor corrector is with sampled voltage crossover point signal; After the load running of the output of described power factor corrector, detect the direct voltage of the output of described power factor corrector in real time; Obtain the DC reference voltage of the output of described power factor corrector, and calculate the voltage difference between the direct voltage of described output and described DC reference voltage, and regulate with Drazin inverse parameter to described voltage difference; Power switch pipe in power factor corrector according to described voltage over zero signal controlling starts open-minded, and obtain the service time of described power switch pipe at least twice switch in half power cycle according to described regulating parameter and open interval, to control described power switch pipe.
According to the control method of the power factor corrector of the embodiment of the present invention, the voltage difference between the direct voltage of output and the DC reference voltage of acquisition is calculated by the direct voltage of the output of detection power factor corrector, and regulate with Drazin inverse parameter to voltage difference, then start open-minded according to the power switch pipe in the voltage over zero signal controlling power factor corrector of sampling, and obtain the service time of power switch pipe at least twice switch in half power cycle according to regulating parameter and open interval, to control power switch pipe, so only need these two parameters of direct voltage of sampled voltage crossover point signal and detection output, just can the direct voltage of control output end with the voltage magnitude linear change of input power, and according to service time of power switch pipe at least twice switch in half power cycle obtained with open interval and control power switch pipe, improve the harmonic content of input current, guarantee meets corresponding harmonic standard requirement.
According to one embodiment of present invention, the DC reference voltage of the output of the described power factor corrector of described acquisition, specifically comprises: before the load startup optimization of described output, detects the initial DC voltage of described output; Initial DC voltage according to described output obtains described DC reference voltage.
According to one embodiment of present invention, the described initial DC voltage according to described output obtains described DC reference voltage, specifically comprise: the voltage peak calculating described input power according to the initial DC voltage of described output, and the voltage peak of described input power is multiplied by predetermined coefficient to obtain described DC reference voltage.
Wherein, described predetermined coefficient is 0.8-0.9.
According to one embodiment of present invention, the on-off times of described power switch pipe in half power cycle is twice, the one-to-one relationship table of the pulse angle of regulating parameter and the power switch pipe pulse angle opened of second time and twice shutoff is preset with in described power factor corrector, wherein, according to the time interval that described regulating parameter and described one-to-one relationship table obtain the first time service time of described power switch pipe in half power cycle, second time service time and open for twice.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the control device of power factor corrector according to an embodiment of the invention;
Fig. 2 is the one-to-one relationship curve synoptic diagram of the pulse angle of regulating parameter digit and the power switch pipe pulse angle opened of second time and twice shutoff according to an embodiment of the invention;
Fig. 3 is switch controlling signal, input voltage waveform and input current waveform schematic diagram in a power cycle according to an embodiment of the invention;
Fig. 4 is the circuit topology schematic diagram of power factor corrector according to a first embodiment of the present invention;
Fig. 5 is the circuit topology schematic diagram of power factor corrector according to a second embodiment of the present invention;
Fig. 6 is the circuit topology schematic diagram of power factor corrector according to a third embodiment of the present invention;
Fig. 7 is the circuit topology schematic diagram of power factor corrector according to a fourth embodiment of the present invention;
Fig. 8 is the circuit topology schematic diagram of power factor corrector according to a fifth embodiment of the present invention; And
Fig. 9 is the flow chart of the control method of power factor corrector according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The control device of power factor corrector and the control method of power factor corrector that propose according to the embodiment of the present invention are described with reference to the accompanying drawings.
As shown in Figure 1, the control device of the power factor corrector of one embodiment of the invention comprises zero passage detection module 10, voltage detection module 20 and control module 30 such as MCU (MicroControlUnit, microcontroller).
Wherein, namely zero passage detection module 10 is input to the voltage of the AC power in BOOST loop with sampled voltage crossover point signal V_ZERO for the voltage of the input power of detection power factor corrector, such as, sampling can be held to obtain from the L of input power; Voltage detection module 20 is for the direct voltage of output of detection power factor corrector real-time after the load running of the output of power factor corrector and the DC bus-bar voltage V_DC of output.Wherein, zero passage detection module 10 can be general zero passage signal detection circuit, and voltage detection module 20 can be the voltage sampling circuit be made up of divider resistance, and concrete circuit structure just repeats no more at this.
Control module 30 is connected with voltage detection module 20 with zero passage detection module 10 respectively, and control module 30 is for obtaining the DC reference voltage V_DC of the output of power factor corrector
rEF, and calculate direct voltage V_DC and the DC reference voltage V_DC of output
rEFbetween voltage difference, and regulate such as PI to regulate with Drazin inverse parameter d igit to this voltage difference, and the power switch pipe that control module 30 also controls in power factor corrector according to voltage over zero signal V_ZERO start to open namely when the voltage over zero of AC power power switch pipe start open-minded, and obtain the service time of power switch pipe at least twice switch in half power cycle according to regulating parameter digit and open interval, to control power switch pipe, thus the direct voltage size realizing control output end within the specific limits follows the voltage swing linear change of AC power.
According to one embodiment of present invention, voltage detection module 20 also for detecting the initial DC voltage V_DC_0 of output before the load startup optimization of output, and control module 30 also obtains DC reference voltage V_DC according to the initial DC voltage V_DC_0 of output
rEF.
Further, control module 30 specifically calculates the voltage peak V_PEAK of described input power according to the initial DC voltage V_DC_0 of output, and the voltage peak V_PEAK of input power is multiplied by predetermined coefficient K to obtain DC reference voltage V_DC
rEF.Wherein, it should be noted that, the voltage peak V_PEAK that not merely can calculate described input power by initial DC voltage V_DC_0 obtains DC reference voltage V_DC
rEF, the rms voltage, average voltage etc. that also can calculate described input power by initial DC voltage V_DC_0 are effectively worth for input sinusoidal voltage peak value one_to_one corresponding and obtain DC reference voltage V_DC
rEF.
That is, when the load of output is not activated, voltage detection module 20 detects the initial DC voltage V_DC_0 of output, and then control module 30 passes through formula
calculate the voltage peak V_PEAK of input power, finally V_PEAK is multiplied by predetermined coefficient K and obtains DC reference voltage V_DC
rEF.Wherein, the span of predetermined coefficient K is 0.8-0.9.
In an embodiment of the present invention, after the load running of output, control module 30 is by DC reference voltage V_DC
rEFwith the direct voltage V_DC of the actual output detected compare subtract each other after obtain an intermediate variable and voltage error value, then to voltage error value carry out PI regulate after adjusted parameter d igit.Wherein, the object using pi regulator to carry out PI regulable control to voltage error value is that control system can be run by fast and stable, therefore, PI adjustment here also can be the regulative mode in P adjustment, PID adjustment or other automatic control, runs as long as can realize system fast and stable.
According to a specific embodiment of the present invention, the on-off times of power switch pipe in half power cycle can be twice, the one-to-one relationship table of the pulse angle of regulating parameter and the power switch pipe pulse angle opened of second time and twice shutoff is preset with in control module 30, as shown in Figure 2, like this, control module 30 obtains the first time service time of power switch pipe in half power cycle according to regulating parameter digit and one-to-one relationship table, second time service time and the time interval of opening for twice, thus according to the time span of twice switch of the corresponding relation regulating power switching tube of regulating parameter digit and mapping table and the time interval, specifically can be embodied by Fig. 3.Wherein, Fig. 3 is that input current effective value is less than 16A, and in current waveform, harmonic content meets IEC61000-3-2 standard-required.
That is, as shown in Figure 2, the corresponding power switch pipe IGBT of different regulating parameter digit (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) the time span of twice switch and the time interval be one-to-one relationship, the waveform of the input current of AC power can be improved like this by the switch of control IGBT, reach the object improving Harmonics of Input content.
Wherein, in order to reduce induction charging electric current in power factor corrector or in order to improve inductance noise, suitably can increase the on-off times of IGBT in half power cycle, but control module still to control to IGBT based on the direct voltage size of the voltage magnitude of input power and output is linear.
Particularly, according to the first embodiment of the present invention, power factor corrector can be semi-initiative type active power factor corrector, as shown in Figure 4, this semi-initiative type active power factor corrector specifically comprises: PFC inductance L 1, a first bridge circuit BR1, the first power switch pipe IGBT1, the second bridge circuit BR2 and the first filter capacitor E1.Wherein, one end of one PFC inductance L 1 is held with the L of described input power and is connected, the first end of the first bridge circuit BR1 is connected with the other end of a PFC inductance L 1, second end of the first bridge circuit BR1 is held with the N of described input power and is connected, the E pole of the first power switch pipe IGBT1 is connected with the 3rd end of the first bridge circuit BR1, the C pole of the first power switch pipe IGBT1 is connected with the 4th end of the first bridge circuit BR1, and the G pole of the first power switch pipe IGBT1 is connected with control module 30; The first end of the second bridge circuit BR2 is held with the N of input power and is connected, second end of the second bridge circuit BR2 is connected with the other end of a PFC inductance L 1,3rd end of the second bridge circuit BR2 and the 4th end are as the output of described power factor corrector, and the first filter capacitor E1 is connected in parallel between the 3rd end of the second bridge circuit BR2 and the 4th end.
Wherein, the first bridge circuit BR1 and the second bridge circuit BR2 is made up of four diodes.
Further, according to a second embodiment of the present invention, as shown in Figure 5, the circuit topological structure of this semi-initiative type active power factor corrector is the distortion of the circuit topological structure shown in Fig. 4, and namely a PFC inductance can be composed in parallel by two inductance L a and Lb.
According to the third embodiment of the invention, power factor corrector can be semi-initiative type active power factor corrector, as shown in Figure 6, this semi-initiative type active power factor corrector specifically comprises: the 3rd bridge circuit BR3, the 2nd PFC inductance L 2, first diode D1, the second power switch pipe IGBT2 and the second filter capacitor E2.The first end of the 3rd bridge circuit BR3 is held with the N of input power and is connected, second end of the 3rd bridge circuit BR3 is held with the L of described input power and is connected, one end of 2nd PFC inductance L 2 is connected with the 4th end of the 3rd bridge circuit BR3, the anode of the first diode D1 is connected with the other end of the 2nd PFC inductance L 2, the E pole of the second power switch pipe IGBT2 is connected with the 3rd end of the 3rd bridge circuit BR3, the C pole of the second power switch pipe IGBT2 is connected with the anode of the first diode D1 with the other end of the 2nd PFC inductance L 2 respectively, the G pole of the second power switch pipe IGBT2 is connected with control module 30, second filter capacitor E2 is connected in parallel between the negative electrode of the first diode D1 and the E pole of the second power switch pipe IGBT2, the two ends of the second filter capacitor E2 are as the output of described power factor corrector.
Wherein, the 3rd bridge circuit BR3 is also made up of four diodes.
And, according to a fourth embodiment of the invention, as shown in Figure 7, the circuit topological structure of this semi-initiative type active power factor corrector is the distortion of the circuit topological structure shown in Fig. 6, namely the 2nd PFC inductance can be composed in parallel by two inductance L a and Lb, and the first diode can be made up of diode Da and Db of two forward parallel connections.
In addition, according to a fifth embodiment of the invention, as shown in Figure 8, the circuit topological structure of this semi-initiative type active power factor corrector is the distortion of the circuit topological structure shown in Fig. 6, is namely made up of two pfc circuits.
Be understandable that, in an embodiment of the present invention, which kind of circuit topological structure no matter power factor corrector adopt, also no matter PFC inductance and IGBT before rectifier bridge or after rectifier bridge, control logic is all identical, namely these two parameters of DC bus-bar voltage detecting voltage over zero signal and output are only needed, just can within the specific limits to control direct voltage size with for the purpose of the voltage magnitude size linear change of AC power, carry out at least 2 switch control rule in half power cycle, realize the requirement meeting corresponding harmonic standard.
According to the control device of the power factor corrector of the embodiment of the present invention, by the direct voltage of the output of zero passage detection module samples crossover point signal and voltage detection module detection power factor corrector, control module calculates the voltage difference between the direct voltage of output and the DC reference voltage of acquisition, and regulate with Drazin inverse parameter to voltage difference, then start open-minded according to the power switch pipe in voltage over zero signal controlling power factor corrector, and obtain the service time of power switch pipe at least twice switch in half power cycle according to regulating parameter and open interval, to control power switch pipe, so only need these two parameters of direct voltage being detected output by zero passage detection module samples voltage over zero signal and voltage detection module, control module just can the direct voltage of control output end with the voltage magnitude linear change of input power, and according to service time of power switch pipe at least twice switch in half power cycle obtained with open interval and control power switch pipe, improve the harmonic content of input current, guarantee meets corresponding harmonic standard requirement.
Fig. 9 is the flow chart of the control method of power factor corrector according to the embodiment of the present invention.As shown in Figure 9, the control method of this power factor corrector comprises the following steps:
S1, the voltage of the input power of detection power factor corrector is with sampled voltage crossover point signal V_ZERO.Be input to the voltage of the AC power in BOOST loop with sampled voltage crossover point signal V_ZERO by detection, such as, sampling can be held to obtain from the L of input power.
S2, after the load running of the output of power factor corrector, the direct voltage V_DC of the output of real-time detection power factor corrector.
S3, obtains the DC reference voltage V_DC of the output of power factor corrector
rEF, and calculate direct voltage V_DC and the DC reference voltage V_DC of output
rEFbetween voltage difference, and voltage difference to be regulated with Drazin inverse parameter d igit.
According to one embodiment of present invention, the DC reference voltage of the output of the described power factor corrector of described acquisition, specifically comprises: before the load startup optimization of described output, detects the initial DC voltage V_DC_0 of described output; Initial DC voltage V_DC_0 according to described output obtains described DC reference voltage V_DC
rEF.
And, the described initial DC voltage according to described output obtains described DC reference voltage, specifically comprise: the voltage peak V_PEAK calculating described input power according to the initial DC voltage V_DC_0 of described output, and the voltage peak V_PEAK of described input power is multiplied by predetermined coefficient K to obtain described DC reference voltage V_DC
rEF.
That is, when the load of output is not activated, detects the initial DC voltage V_DC_0 of output by voltage detection module, then pass through formula
calculate the voltage peak V_PEAK of input power, finally V_PEAK is multiplied by predetermined coefficient K and obtains DC reference voltage V_DC
rEF.Wherein, the span of predetermined coefficient K is 0.8-0.9.
S4, start open-minded according to the power switch pipe in voltage over zero signal controlling power factor corrector, and obtain the service time of power switch pipe at least twice switch in half power cycle according to regulating parameter and open interval, to control power switch pipe.
According to one embodiment of present invention, the on-off times of described power switch pipe in half power cycle is twice, the one-to-one relationship table of the pulse angle of pulse angle that regulating parameter and power switch pipe second time open and twice shutoff is preset with in described power factor corrector and control module MCU, wherein, the time interval that can obtain the first time service time of described power switch pipe in half power cycle, second time service time according to described regulating parameter and described one-to-one relationship table and open for twice.
That is, the predeterminable one-to-one relationship table having the pulse angle of regulating parameter and the power switch pipe pulse angle opened of second time and twice shutoff in MCU, specifically as shown in Figure 2, like this, MCU can obtain the first time service time of power switch pipe in half power cycle according to regulating parameter digit and one-to-one relationship table, second time service time and the time interval of opening for twice, thus according to the time span of twice switch of the corresponding relation regulating power switching tube of regulating parameter digit and mapping table and the time interval, specifically can be embodied by Fig. 3.Wherein, Fig. 3 is that input current effective value is less than 16A, and in current waveform, harmonic content meets IEC61000-3-2 standard-required.
According to the control method of the power factor corrector of the embodiment of the present invention, the voltage difference between the direct voltage of output and the DC reference voltage of acquisition is calculated by the direct voltage of the output of detection power factor corrector, and regulate with Drazin inverse parameter to voltage difference, then start open-minded according to the power switch pipe in the voltage over zero signal controlling power factor corrector of sampling, and obtain the service time of power switch pipe at least twice switch in half power cycle according to regulating parameter and open interval, to control power switch pipe, so only need these two parameters of direct voltage of sampled voltage crossover point signal and detection output, just can the direct voltage of control output end with the voltage magnitude linear change of input power, and according to service time of power switch pipe at least twice switch in half power cycle obtained with open interval and control power switch pipe, improve the harmonic content of input current, guarantee meets corresponding harmonic standard requirement.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (12)
1. a control device for power factor corrector, is characterized in that, comprising:
Zero passage detection module, described zero passage detection module is used for the voltage of the input power of detection power factor corrector with sampled voltage crossover point signal;
Voltage detection module, described voltage detection module is used for the direct voltage of the output detecting described power factor corrector after the load running of the output of described power factor corrector in real time;
Control module, described control module is connected with described voltage detection module with described zero passage detection module respectively, described control module is for obtaining the DC reference voltage of the output of described power factor corrector, and the voltage difference calculated between the direct voltage of described output and described DC reference voltage, and regulate with Drazin inverse parameter to described voltage difference, and the power switch pipe of described control module also in power factor corrector according to described voltage over zero signal controlling starts open-minded, and obtain the service time of described power switch pipe at least twice switch in half power cycle according to described regulating parameter and open interval, to control described power switch pipe.
2. the control device of power factor corrector according to claim 1, it is characterized in that, described voltage detection module also for detecting the initial DC voltage of described output before the load startup optimization of described output, and described control module also obtains described DC reference voltage according to the initial DC voltage of described output.
3. the control device of power factor corrector according to claim 2, it is characterized in that, described control module specifically calculates the voltage peak of described input power according to the initial DC voltage of described output, and the voltage peak of described input power is multiplied by predetermined coefficient to obtain described DC reference voltage.
4. the control device of power factor corrector according to claim 3, is characterized in that, described predetermined coefficient is 0.8-0.9.
5. the control device of power factor corrector according to claim 1, it is characterized in that, the on-off times of described power switch pipe in half power cycle is twice, the one-to-one relationship table of the pulse angle of regulating parameter and the power switch pipe pulse angle opened of second time and twice shutoff is preset with, the time interval that described control module obtains the first time service time of described power switch pipe in half power cycle, second time service time according to described regulating parameter and described one-to-one relationship table and opens for twice in described control module.
6. the control device of the power factor corrector according to any one of claim 1-5, is characterized in that, described power factor corrector is semi-initiative type active power factor corrector, and described semi-initiative type active power factor corrector specifically comprises:
One PFC inductance, described one end of a PFC inductance is held with the L of described input power and is connected;
First bridge circuit, the first end of described first bridge circuit is connected with the other end of a described PFC inductance, and the second end of described first bridge circuit is held with the N of described input power and is connected;
First power switch pipe IGBT1, the E pole of described first power switch pipe IGBT1 is connected with the 3rd end of described first bridge circuit, the C pole of described first power switch pipe IGBT1 is connected with the 4th end of described first bridge circuit, and the G pole of described first power switch pipe IGBT1 is connected with described control module;
Second bridge circuit, the first end of described second bridge circuit is held with the N of described input power and is connected, second end of described second bridge circuit is connected with the other end of a described PFC inductance, and the 3rd end of described second bridge circuit and the 4th end are as the output of described power factor corrector;
First filter capacitor, described first filter capacitor is connected in parallel between the 3rd end of described second bridge circuit and the 4th end.
7. the control device of the power factor corrector according to any one of claim 1-5, is characterized in that, described power factor corrector is semi-initiative type active power factor corrector, and described semi-initiative type active power factor corrector specifically comprises:
3rd bridge circuit, the described first end of the 3rd bridge circuit is held with the N of described input power and is connected, and described second end of the 3rd bridge circuit is held with the L of described input power and is connected;
2nd PFC inductance, one end of described 2nd PFC inductance is connected with the 4th end of described 3rd bridge circuit;
Described first diode, the anode of described first diode is connected with the other end of described 2nd PFC inductance;
Second power switch pipe IGBT2, the E pole of described second power switch pipe IGBT2 is connected with the 3rd end of described 3rd bridge circuit, the C pole of described second power switch pipe IGBT2 is connected with the anode of described first diode with the other end of described 2nd PFC inductance respectively, and the G pole of described second power switch pipe IGBT2 is connected with described control module;
Second filter capacitor, described second filter capacitor is connected in parallel between the negative electrode of described first diode and the E pole of described second power switch pipe IGBT2, and the two ends of described second filter capacitor are as the output of described power factor corrector.
8. a control method for power factor corrector, is characterized in that, comprises the following steps:
The voltage of the input power of detection power factor corrector is with sampled voltage crossover point signal;
After the load running of the output of described power factor corrector, detect the direct voltage of the output of described power factor corrector in real time;
Obtain the DC reference voltage of the output of described power factor corrector, and calculate the voltage difference between the direct voltage of described output and described DC reference voltage, and regulate with Drazin inverse parameter to described voltage difference;
Power switch pipe in power factor corrector according to described voltage over zero signal controlling starts open-minded, and obtain the service time of described power switch pipe at least twice switch in half power cycle according to described regulating parameter and open interval, to control described power switch pipe.
9. the control method of power factor corrector according to claim 8, is characterized in that, the DC reference voltage of the output of the described power factor corrector of described acquisition, specifically comprises:
Before the load startup optimization of described output, detect the initial DC voltage of described output;
Initial DC voltage according to described output obtains described DC reference voltage.
10. the control method of power factor corrector according to claim 9, is characterized in that, the described initial DC voltage according to described output obtains described DC reference voltage, specifically comprises:
Calculate the voltage peak of described input power according to the initial DC voltage of described output, and the voltage peak of described input power is multiplied by predetermined coefficient to obtain described DC reference voltage.
The control method of 11. power factor correctors according to claim 10, is characterized in that, described predetermined coefficient is 0.8-0.9.
The control method of 12. power factor correctors according to claim 8, it is characterized in that, the on-off times of described power switch pipe in half power cycle is twice, the one-to-one relationship table of the pulse angle of regulating parameter and the power switch pipe pulse angle opened of second time and twice shutoff is preset with in described power factor corrector, wherein, according to the time interval that described regulating parameter and described one-to-one relationship table obtain the first time service time of described power switch pipe in half power cycle, second time service time and open for twice.
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| CN108469559A (en) * | 2018-03-13 | 2018-08-31 | 广东美的制冷设备有限公司 | Method for diagnosing faults, the device of power factor corrector for air conditioner |
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Application publication date: 20160309 |