CN104716821A - Air conditioner controller, power conversion circuit of air conditioner controller, and power factor correction circuit - Google Patents
Air conditioner controller, power conversion circuit of air conditioner controller, and power factor correction circuit Download PDFInfo
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- CN104716821A CN104716821A CN201310706074.2A CN201310706074A CN104716821A CN 104716821 A CN104716821 A CN 104716821A CN 201310706074 A CN201310706074 A CN 201310706074A CN 104716821 A CN104716821 A CN 104716821A
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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
- H02M1/4208—Arrangements for improving power factor of AC input
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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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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses an air conditioner controller, a power conversion circuit of the air conditioner controller, and a power factor correction circuit. The power factor correction circuit comprises an inductor, a fly-wheel diode, at least two switch tubes and a capacitor, wherein the at least two switch tubes are connected to connection nodes of the inductor and the fly-wheel diode, a loop is formed by the switch tubes and the inductor when the switch tubes are turned on, the inductor discharges through the fly-wheel diode and the capacitor when the switch tubes are turned off, and the at least two switch tubes are turned on alternately under the control of a control circuit. According to the power factor correction circuit, the multiple switch tubes are turned on alternately, the duty ratio is small when the switch tubes are turned on, in this way, breakover losses are small, and the power dissipated at the rated working frequency can meet the requirement for pulse high-power working. Due to the fact that the on-off pulse frequency of the multiple switch tubes is multiple times that of a single switch tube, the inductor can work at a high frequency, the size of an iron core of the inductor and the number of turns of a winding of the inductor can be greatly reduced, and the size and right of the high-frequency inductor can be reduced or the current and power borne by the high-frequency inductor can be greatly increased.
Description
[technical field]
The invention belongs to field of power conversion, particularly about the improvement of a kind of circuit of power factor correction in AC/DC power conversion.
[background technology]
Existing consuming device normally adopts the direct current of the alternating current of civil power through being formed after over commutation to be normally more level and smooth direct current with a jumbo filter capacitor by the direct current electrofiltration of pulsation after rectification as this DC power supply of DC power supply, this just causes alternating current when to this capacitor charging, only just there is electric current in the positive negative peak regions of alternating current, other regions are because input AC piezoelectric voltage is lower than voltage on capacitor, rectifier bridge is in reverse blocking state, and this period does not have input current.The pulse-type current waveform of this serious distortion contains a large amount of Resonance Wave Compositions, causes line power factor degradation.For improving the efficiency of circuit transmission, AC line current must be forced to follow the trail of voltage waveform transient change track, and make electric current and voltage keep same-phase, make system be pure resistive, such technology is referred to as power factor correction.
Existing circuit of power factor correction is divided into passive power factor correcting circuit and APFC, and APFC adopts active element active accommodation to improve input power factor, and it improves better effects if.
Existing a kind of APFC, it comprises rectifier bridge, inductance, switching tube and fly-wheel diode, it utilizes the conducting of switching tube or cut-off state to make inductive current be slope line lifting, thus make the peak of the absolute value of inductive current within each cycle follow the absolute value of input voltage, realize power factor correction.But this circuit of power factor correction is the circuit of power factor correction that single inductance and single switching transistor form, this circuit of power factor correction, because the heat-sinking capability of single switching transistor or current limit, the occasion that only suitable power is less.
Existing another kind of APFC, its correcting circuit comprises two inductance, two switching tubes and two fly-wheel diodes, it is utilize the conducting of switching tube or cut-off state to make inductance be slope line lifting equally, thus make the peak of the absolute value of inductive current within each cycle follow the absolute value of input voltage, realize power factor correction, but this circuit of power factor correction is two inductance and two switching tubes, wherein each inductance and a switching tube form a loop, two switching tubes are controlled each other in turn or alternate conduction by control circuit, it adopts two inductance, and each inductance still forms a loop with a switching tube, by the restriction of switching tube, its operating frequency can not be very high, because the operating frequency of inductance can not be very high, same power its must have larger inductance value and volume, so this circuit of power factor correction not only inductance quantity is many, and the volume of inductance is also larger, installation for circuit board can bring difficulty, and material cost, weight all can improve.
Another APFC existing, its correcting circuit comprises an inductance, two switching tubes and two fly-wheel diodes in parallel, and wherein two switching tubes are conducting simultaneously or cut-off, carry out the electric current that shunted resistively inductance produces.But this circuit of power factor correction, although be only have an inductance and multiple switching tube, but multiple switching tube is conducting simultaneously or cut-off, although the electric current of inductance can be shared like this, but because multiple switching tube is conducting simultaneously or cut-off, because the control circuit of each switching tube is different, ensure the simultaneously conducting of multiple switching tube or cutoff more difficult, and once nonsynchronous situation appears in multiple switching tube conducting or cut-off, such as occur that a conducting is fast, during the slow situation of conducting, then flow through two switching tubes current potential must one large one little, there will be the situation of device heating, moreover, because multiple switching tube is conducting simultaneously or cut-off, the ON-OFF frequency of the frequency of its ON-OFF and a switching tube is suitable, by the restriction of single switching transistor, the operating frequency of inductance also can not be too high, therefore the volume of its single inductance is still larger, or can cause the larger problem of difficulty and cost and weight is installed.
[summary of the invention]
The object of the present invention is to provide a kind of circuit of power factor correction, it can bear relatively high power, and circuit volume is little, and cost is low.
Another object of the present invention is to provide a kind of power converting circuit, its circuit of power factor correction can bear relatively high power, and circuit volume is little, and cost is low.
Another object of the present invention is to provide a kind of air-conditioner controller, and it adopts aforementioned power factor correcting circuit.
For reaching aforementioned object, a kind of circuit of power factor correction of the present invention, it comprises an inductance, a fly-wheel diode, at least two switching tubes and at least one capacitor, described at least two switching tubes are connected to the connected node of described inductance and described fly-wheel diode jointly, during described switching tube conducting and described inductance form loop, to inductive energy storage, during described switching tube cut-off, described inductance is by described fly-wheel diode and described capacitor discharge, described at least two switching tubes are controlled in turn or alternate conduction by control circuit, the voltage of the connected node of inductance and fly-wheel diode is controlled by the conducting of described at least two switching tubes or cut-off.
According to one embodiment of present invention, state at least two switching tubes by drive control circuit in turn or alternate conduction, be specially, when a switching tube conducting, other switching tubes end, during each switching tube conducting, a switching tube and described inductance or described fly-wheel diode is only had to form loop.
According to one embodiment of present invention, described Drive and Control Circuit can set the quantity of the switching tube of alternate conduction according to circuit conditions, and in turn or alternate conduction, rest switch pipe is in cut-off state to a part of switching tube always.
According to one embodiment of present invention, one end of described inductance is connected with the power positive end for correcting circuit, and the other end of described inductance is connected with the anode of fly-wheel diode; The negative terminal of described fly-wheel diode is connected with the anode of described capacitor; The collector electrode of described switching tube is connected to the node that described inductance is connected with the anode of fly-wheel diode, the emitter of described switching tube is connected with the negative terminal of described capacitor and for the power supply negative terminal of correcting circuit, the base stage of described switching tube is controlled by control circuit, to control conducting and the cut-off of described switching tube.
According to one embodiment of present invention, the collector electrode of described switching tube is connected with the power positive end for correcting circuit, the emitter of described switching tube is connected with the negative pole of one end of inductance and fly-wheel diode, the base stage of described switching tube is controlled by control circuit, to control conducting and the cut-off of described switching tube; The other end of described inductance is connected with the anode of capacitor; The anode of described fly-wheel diode and the negative terminal of capacitor are connected to the power supply negative terminal for correcting circuit jointly.
According to one embodiment of present invention, what described circuit of power factor correction switching tube adopted is igbt transistor, mosfet transistor or BJT transistor.
According to one embodiment of present invention, the control circuit of described circuit of power factor correction switching tube, the input terminal voltage sampled signal in the circuit that its control signal is corrected by circuit of power factor correction, output end voltage sampled signal, current sampling signal export after central processing unit logical operation.
According to one embodiment of present invention, the control circuit of described circuit of power factor correction switching tube comprises voltage comparator, multiplier, current comparator, oscillator, under-voltage locking device, trigger pulse distributor and OR-NOT circuit; Output voltage sampled signal in the circuit that voltage comparator received power factor correcting circuit corrects compares with a reference voltage, an input of the signal input current comparator that the input voltage sampled signal in the circuit that the signal of voltage comparator output and circuit of power factor correction correct exports after multiplier computation, another input of current sampling signal input current comparator in the circuit that circuit of power factor correction corrects, after current comparator relatively, output signal to trigger, trigger produces control signal; Oscillator provides oscillator signal to each unit, on the one hand by trigger reset, the NOR gate of output is pinned on the other hand, then is exactly the clock signal as pulsqe distributor on the one hand; The pulse that pulsqe distributor accepts oscillator distributes control signal according to the order of sequence to each different switching tube; Under-voltage locking device at external power source lower than the power supply closing inner oscillator, multiplier etc. during predetermined value, to guarantee that drive circuit reliably cuts out locking; The signal that signal, the output signal of pulsqe distributor, the signal of oscillator output and under-voltage locking device that wherein trigger produces export exports the control signal as each switching tube respectively through described NOR gate.
For reaching another object aforementioned, a kind of AC/DC power translation circuit of the present invention, it comprises rectification circuit, circuit of power factor correction, wherein AC rectification is become DC pulse electricity by rectification circuit, and described circuit of power factor correction is for correcting the galvanic power factor after rectifier circuit rectifies; Described circuit of power factor correction adopts any one circuit of power factor correction aforementioned, corrects the power supply after rectification export by the conducting of described at least two switching tubes or the direct voltage of cut-off control inductance, fly-wheel diode and capacitor connected node.
For reaching an aforementioned object again, a kind of air-conditioner controller of the present invention, it comprises filter circuit, rectification circuit, power factor correction circuit, Active PFC Drive and Control Circuit, Switching Power Supply, drived control chip, convertible frequency air-conditioner control chip and IPM drive circuit; Input power after filtering circuit carries out filtering, then carry out through rectification circuit the direct current that rectification becomes pulsation, Rectified alternating current after over commutation becomes stable DC power supply and supplies IPM drive circuit and carry out motor driving after circuit of power factor correction corrects, power to Switching Power Supply, this Switching Power Supply can be used for drived control chip, convertible frequency air-conditioner control chip and IPM drive circuit simultaneously; The signal that convertible frequency air-conditioner control chip gathers according to the input signal of remote controller and transducer exports control signal, the stepping motor of control indoor set, blower fan, electric expansion valve or output display information, or control IPM drive circuit (Intelligent Power Module) drives the motor of compressor; Wherein said circuit of power factor correction adopts any one circuit of power factor correction aforesaid.
Compared with prior art, circuit of power factor correction of the present invention, jointly multiple switching tube is connected between its inductance with fly-wheel diode, multiple switching tube is controlled in turn or alternate conduction by control circuit, adjust the electric current flowing through inductance, owing to being that multiple switching tube is connected between inductance and fly-wheel diode jointly, and multiple switching tube is in turn or alternate conduction, the duty ratio of single tube is little, so its conduction loss is also less, under rated operation frequency, the dissipation power of device can meet pulse high current work.Switching pulse frequency due to the synthesis of switching tube Q1, Q2, Q3......Qn collector electrode is n times of single switching transistor, so the frequency of high-frequency inductor L real work is the switching frequency of n times of single tube Q; High-frequency inductor L is the heaviest maximum device in APFC, and its dimensional weight is directly proportional to inductance value, and flows through square being directly proportional of electric current; By operation principle, the inductance value of high-frequency inductor L and the positive inverse ratio of operating frequency, along with significantly improving of inductance operating frequency, core dimensions and umber of turn also can significantly reduce, thus size and the weight of high-frequency inductor can be greatly reduced, or significantly increase the electric current and power that bear.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the circuit of power factor correction of one embodiment of the present of invention.
Fig. 2 is the structural representation of the circuit of power factor correction of an alternative embodiment of the invention.
Fig. 3 is the schematic diagram of the power converting circuit of the circuit of power factor correction shown in employing Fig. 1 of the present invention.
Fig. 4 is the structural representation of the switching tube Drive and Control Circuit of the circuit of power factor correction of one embodiment of the present of invention.
Fig. 5 is the structural representation of the driving circuit section of the switching tube Drive and Control Circuit of the circuit of power factor correction of the present invention shown in Fig. 4.
Fig. 6 is the structural representation of another embodiment of the switching tube Drive and Control Circuit of circuit of power factor correction of the present invention.
Fig. 7 is the driving pulse sequential chart of each switching tube of circuit of power factor correction of the present invention.
Fig. 8 is the schematic diagram of circuit voltage current waveform after circuit of power factor correction of the present invention corrects.
Fig. 9 is the structural representation of variable frequency air-conditioner controller of the present invention.
[embodiment]
Below in conjunction with accompanying drawing, specific embodiments of the invention are described.
Refer to shown in Fig. 1, it shows the schematic diagram of an embodiment of circuit of power factor correction of the present invention, and wherein this circuit of power factor correction comprises an inductance L, sustained diode 1, multiple switching tube Q1, Q2......Qn and a capacitor C.Wherein one end of inductance L is connected with the positive pole Vin+ of power input, the other end of inductance L is connected with the positive pole of sustained diode 1, the negative pole of sustained diode 1 is connected with the positive pole Vout+ of the anode of capacitor C and power output end, the collector electrode of multiple switching tube is connected to the node that inductance L is connected with sustained diode 1 positive pole jointly, the emitter of multiple switching tube is connected with the negative pole Vout-of the negative terminal of capacitor C and the output of power supply, each switching tube Q1, the base stage of Q2......Qn is driven by Drive and Control Circuit respectively, control the plurality of switching tube Q1, Q2......Qn conducting or alternate conduction in turn in order.When switching tube Q1, Q2......Qn conducting, sustained diode 1 is ended, switching tube Q1, Q2......Qn and inductance L form loop, inductance L energy storage, when switching tube Q1, Q2......Qn end, sustained diode 1 conducting, inductance L is by sustained diode 1 and capacitor C electric discharge out-put supply.
Fig. 2 is another specific embodiment of circuit of power factor correction of the present invention, in the embodiment shown in earlier figures 1, circuit of power factor correction inductance L and power supply when switching tube ends pass through sustained diode 1 out-put supply jointly, so voltage increases, the circuit of power factor correction of this connected mode is referred to as step-up type power factor correcting circuit.Multiple switching tube Q1 of this circuit of power factor correction in the circuit of power factor correction shown in Fig. 2, the collector electrode of Q2......Qn is connected to the positive pole Vin+ of power supply, the switching tube Q1 of circuit of power factor correction, the emitter of Q2......Qn is connected to the connected node of inductance L and sustained diode 1 negative pole jointly, the other end of inductance L connects the anode of capacitor C and the positive pole Vout+ of power output end, the positive pole of sustained diode 1 is connected to the negative terminal of capacitor C and the negative pole Vout-of power output end, each switching tube Q1, the base stage of Q2......Qn is driven by Drive and Control Circuit respectively, control the plurality of switching tube Q1, Q2......Qn conducting or alternate conduction in turn in order, at switching tube Q1, during Q2......Qn conducting, sustained diode 1 is ended, switching tube Q1, Q2......Qn and inductance L form loop out-put supply, at switching tube Q1, during Q2......Qn cut-off, sustained diode 1 conducting, inductance L to be discharged out-put supply by sustained diode 1.Because when switching tube ends, only by inductive discharge out-put supply, so power of voltage ratio is low, be called buck-type power factor correction circuit.
It should be noted that, multiple switching tube of the present invention conducting in turn, it can be Q1, Q2......Qn conducting in turn in order, also can be the alternate conduction of Q1, Q3, Q5, Q2, Q4, Q6......Qn, when a switching tube conducting, other switching tubes end, and during each switching tube conducting, only have a switching tube and described inductance or described fly-wheel diode to form loop.Only illustrate, and non-limiting the present invention must be the conducting successively that puts in order by switching tube herein.Multiple switching tube of the present invention also can according to actual conditions, the size of such as circuit power, determine the quantity of the switching tube of real work, such as, when circuit power is less, only can establish 2 switching tube alternate conduction, when circuit power is larger, 3 switching tube alternate conduction can be established, when circuit power is very large, 4 switching tube alternate conduction etc.This can determine quantity of power switches when designing, and the circulation simultaneously adjusting the pulsqe distributor T in control circuit exports quantity.In addition, in other examples, switching tube of the present invention also can be such as be preset with 4 switching tubes, when circuit power is less, can only have 2 switching tube alternate conduction, other 2 switching tubes are in cut-off state always, when circuit power is larger, can establish 3 switching tube alternate conduction, 1 switching tube is in cut-off state always, when circuit power is very large, 4 switching tube alternate conduction etc.
Below be only two specific embodiments in power factor correction loop of the present invention, circuit of power factor correction of the present invention also can be buck-boost type circuit of power factor correction, normal shock type circuit of power factor correction, flyback circuit of power factor correction etc. in other embodiments, all can adopt described in previous examples in these circuit of power factor correction, adopt the mode that single inductance is connected with multiple switching tube simultaneously, multiple switching tube is controlled in turn or the technical scheme of alternate conduction, detailed description of illustrating no longer one by one herein by control circuit.
In the aforementioned embodiment, described switching tube Q1, Q2......Qn can be insulated gate bipolar transistor (IGBT), mos field effect transistor (MOSFET) or bipolar junction transistor (BJT), preferably adopt insulated gate bipolar transistor (IGBT).
Below with circuit of power factor correction of the present invention for boost power factor correction circuit, transistor used is igbt transistor is that the course of work of example to circuit of power factor correction of the present invention embodiment is described.
As shown in Figure 3, the structural representation of its display power converting circuit of the present invention, wherein this power converting circuit adopts the boost power factor correction circuit of the present invention shown in Fig. 1 to carry out power factor correction to the out-put supply after rectifier bridge rectification.As shown in Figure 3, AC power forms the Rectified alternating current of half cycle sine law after rectifier bridge rectification, is wherein connected with a filter capacitor C1, the high frequency spikes voltage in filter capacitor elimination Rectified alternating current between the anode of rectifier bridge and negative terminal.
The positive output end of rectifier bridge is connected with one end of the inductance L of circuit of power factor correction, the other end of inductance L is connected with the positive pole of sustained diode 1, multiple switching tube Q1, the collector electrode of Q2......Qn is connected to the connected node of inductance L and sustained diode 1 jointly, multiple switching tube Q1, the emitter of Q2......Qn is connected to a common node B jointly, a sampling resistor R1 is connected between this Node B and negative pole of out-put supply, wherein the instant current sampling signal Is of this Node B is sent to switching tube Q1, the Drive and Control Circuit of Q2......Qn is as control switch pipe Q1, a reference signal of Q2......Qn conducting.
The negative pole of sustained diode 1 is connected with one end of the anode of capacitor C1, electrochemical capacitor E1 and voltage sample resistance R2, and be jointly connected to the positive terminal DC+ of out-put supply, wherein capacitor C1 is high frequency capacitor, and electrochemical capacitor E1 is low frequency bulk capacitor.The negative terminal of rectifier bridge B1 is connected with the negative terminal of electrochemical capacitor E1 with capacitor C1, C2, current sampling resistor R1, voltage sample resistance R3, jointly be connected to the negative pole end DC-of out-put supply, the negative pole end DC-of this power supply holds input signal as the COM of Drive and Control Circuit.
The other end of voltage sample resistance R2 is connected with the other end of resistance R3, voltage sample resistance R2 and R3 wherein connected between out-put supply positive terminal DC+ and out-put supply negative pole end DC-forms dividing potential drop to output voltage, the node that resistance R2 with R3 is connected is as voltage sample node, the voltage signal of this node is output voltage sampled signal Vdc, and it is sent to the reference signal of Drive and Control Circuit as control switch pipe Q1, Q2......Qn conducting of switching tube Q1, Q2......Qn.
A voltage sample resistance R4 is connected with at the anode of electric capacity C1, the voltage signal of resistance R4 is as input voltage sampled signal Vac, and it is sent to the reference signal of Drive and Control Circuit as control switch pipe Q1, Q2......Qn conducting of switching tube Q1, Q2......Qn.
Refer to shown in Fig. 4, it shows the structural representation of an embodiment of the switching tube Drive and Control Circuit of circuit of power factor correction of the present invention.As shown in Figure 4, the Drive and Control Circuit of circuit of power factor correction of the present invention comprises a central processing unit (MCU), wherein the sampled current signals Is of aforementioned resistance R1 up-sampling inputs the A2 pin of MCU, aforementioned resistance R2, the output voltage sampled signal Vdc of R3 up-sampling inputs the A3 pin of MCU, the input voltage sampled signal Vac of aforementioned resistance R4 up-sampling inputs the A1 pin of MCU, the negative pole end DC-of power supply inputs the COM end pin of MCU, inner through logical operation at MCU, by the output port P1 of MCU, P2......Pn exports corresponding control switch pipe Q1 respectively, the control signal of Q2......Qn is to switching tube Q1, the drive circuit D1 of Q2......Qn, D2......Dn.Wherein the logical operation of MCU inside mainly carries out computing according to exporting sampled voltage signal Vdc and input sample voltage signal Vac and current sampling signal Is, make the current signal of circuit keep same-phase with voltage signal as far as possible and reduce harmonic wave, the specific algorithm the present invention about MCU inside no longer describes in detail.
Refer to shown in Fig. 5, the concrete structure of an embodiment of switching tube Q1, Q2......Qn drive circuit of its display shown in Fig. 4 of the present invention.As shown in Figure 5, the NPN type switching tube NA conducting when the control signal Pn of the switching tube that MCU exports is high level, the base voltage of positive-negative-positive switching tube PA is made to become low level, switching tube PA conducting, then the base voltage of NPN type switching tube NB becomes high level, and switching tube NB conducting exports high level control switch pipe Qn conducting.The NPN type switching tube NA cut-off when the control signal Pn of the switching tube that MCU exports is low level, the base voltage of positive-negative-positive switching tube PA is high level, switching tube PA ends, then the base voltage of positive-negative-positive switching tube PB becomes low level, and switching tube PB conducting output low level control switch pipe Qn ends.
Refer to shown in Fig. 6, it shows the structural representation of another embodiment of the switching tube Drive and Control Circuit of circuit of power factor correction of the present invention.As shown in Figure 6, in one particular embodiment of the present invention, what the Drive and Control Circuit of circuit of power factor correction adopted is analog element composition, and wherein Drive and Control Circuit mainly comprises voltage comparator COMP1, multiplier M, current comparator COMP2, oscillator OSC, under-voltage locking device UVLO, trigger D and pulsqe distributor T.Voltage comparator COMP1 receives sampling resistor R2 in Fig. 3, the output voltage sampled signal Vdc that R3 gathers compares with a reference voltage VREF, an input of the signal input current comparator COMP2 that the input voltage sampled signal Vac that gathers of resistance R4 exports after multiplier M computing in the signal that comparator COMP1 exports and Fig. 3, in Fig. 3, another input of the current sampling signal Is input current comparator COMP2 that resistance R1 gathers outputs signal to trigger D after current comparator relatively, trigger D produces control signal, pulsqe distributor T distributes different control signals to different switching tube Q1, Q2......Qn.Oscillator OSC provides oscillator signal to each unit, pulsqe distributor is by the pulses generation sequential of oscillator, namely each end cycle of oscillator all can export a very narrow pulse, on the one hand trigger D is resetted, on the other hand the NOR gate of output is pinned, be exactly the clock signal as pulsqe distributor T more on the one hand, pulsqe distributor T often receives a clock signal and is just switched to next delivery outlet, thus realizes the switching of switching tube.Under-voltage locking device UVLO at external power source VCC lower than the 5V power supply closing inner oscillator OSC, multiplier M etc. time predetermined value (time such as lower than 11 volts), to guarantee that drive circuit reliably cuts out locking.The signal that signal, the output signal of pulsqe distributor T, the signal of oscillator OSC output and under-voltage locking device UVLO that wherein trigger D produces export exports the control signal as each switching tube Q1, Q2......Qn respectively through a NOR gate.As shown in Figure 6, the drive circuit of each switching tube Qn is made up of a NPN transistor Nn and PNP transistor Pn, when control signal is high level, NPN transistor Nn conducting, export high level driving switch pipe Qn conducting, when control signal is low level, PNP transistor Pn conducting, output low level driving switch pipe Qn ends.
Below be only the structural representation of the drive circuit of control switch pipe conducting that two of enumerating are different and cut-off.Concrete Drive and Control Circuit can adopt different particular circuit configurations forms, will not enumerate herein, as long as can produce each switching tube of driving as shown in Figure 7 in turn or the drive pulse signal of alternate conduction.
Refer to shown in Fig. 3, operationally, alternating current exports the Rectified alternating current of half cycle sine law after rectifier bridge rectification, voltage signal, the voltage signal of resistance R2, R3 sampling and the inductor current signal of resistance R1 sampling that now switching tube Drive and Control Circuit is sampled according to resistance R4 produce the pulse of driving switch pipe Q1 conducting through logical operation, then switching tube Q1 conducting, switching tube Q1 conducting subsequent flows diode D1 ends, inductance and switching tube Q1 form loop, and the electric current on inductance then rises in oblique line.When switching tube Q1 ends, inductance L is discharged by sustained diode 1, and the electric current in inductance L is that oblique line declines, and forms a sawtooth waveforms.Following Drive and Control Circuit can control switch pipe Q2 conducting, and switching tube Q2 conducting subsequent flows diode ends, and inductance and switching tube Q2 forms loop, and the electric current on inductance is then oblique line rising.When switching tube Q2 ends, inductance L is discharged by fly-wheel diode, electric current in inductance L is that oblique line declines, form a sawtooth waveforms, the rest may be inferred, until switching tube Qn conducting, the current waveform formed so as shown in Figure 8, electric current on inductance realize substantially with arc in phase, reach the object of Active Power Factor Correction.
Refer to shown in Fig. 9, it shows the structural representation of variable frequency air-conditioner controller of the present invention, and it adopts the power converting circuit comprising circuit of power factor correction of the present invention as shown in Figure 3.As shown in Figure 9, variable frequency air-conditioner controller 100 of the present invention, it comprises filter circuit, rectification circuit, power factor correction circuit, Active PFC Drive and Control Circuit, switching power circuit, convertible frequency air-conditioner control chip and IPM drive circuit etc.
Civil power after filtering circuit carries out filtering, then carry out through rectification circuit the direct current that rectification becomes pulsation, Rectified alternating current after over commutation becomes stable DC power supply and supplies IPM drive circuit and carry out motor driving after circuit of power factor correction corrects, power to switching power circuit, this switching power circuit provides power supply to supply convertible frequency air-conditioner control chip and IPM drive circuit etc. simultaneously.The signal that convertible frequency air-conditioner control chip gathers according to the input signal of remote controller and transducer exports control signal, the stepping motor of control indoor set, blower fan, electric expansion valve or output display information, or control IPM drive circuit (Intelligent Power Module) drives the motor of compressor.Circuit of power factor correction wherein in Fig. 9 and the circuit of power factor correction shown in Fig. 1 or Fig. 2 of the present invention, rectification circuit in figure and circuit of power factor correction and provide the power converting circuit shown in the Drive and Control Circuit of signal and earlier figures 3 to circuit of power factor correction, civil power is after rectifier circuit rectifies, capability correction is carried out through circuit of power factor correction, multiple switching tubes wherein in circuit of power factor correction are by circuit of power factor correction drive control circuit alternate conduction, its concrete course of work, no longer describes in detail herein.
Circuit of power factor correction of the present invention, jointly multiple switching tube Q1 is connected between its inductance L with sustained diode 1, Q2......Qn, multiple switching tube Q1 is controlled by control circuit, Q2......Qn in turn or alternate conduction, adjust the electric current flowing through inductance L, owing to being multiple switching tube Q1, Q2......Qn is connected between inductance L and sustained diode 1 jointly, and multiple switching tube Q1, Q2......Qn is in turn or alternate conduction, the duty ratio of single tube is little, so its conduction loss is also less, under rated operation frequency, the dissipation power of device can meet pulse high current work.
Switching pulse frequency due to the synthesis of switching tube Q1, Q2, Q3......Qn collector electrode is n times of single switching transistor, so the frequency of high-frequency inductor L real work is the switching frequency of n times of single tube Q; High-frequency inductor L is the heaviest maximum device in APFC, and its dimensional weight is directly proportional to inductance value, and flows through square being directly proportional of electric current; By operation principle, the inductance value of high-frequency inductor L and the positive inverse ratio of operating frequency, along with significantly improving of inductance operating frequency, core dimensions and umber of turn also can significantly reduce, thus size and the weight of high-frequency inductor can be greatly reduced, or significantly increase the electric current and power that bear.
It should be noted that: above embodiment is only for illustration of the present invention and unrestricted technical scheme described in the invention, although this specification reference the above embodiments are to present invention has been detailed description, but, those of ordinary skill in the art is to be understood that, person of ordinary skill in the field still can modify to the present invention or equivalent replacement, and all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.
Claims (10)
1. a circuit of power factor correction, it comprises an inductance, a fly-wheel diode, at least two switching tubes and at least one capacitor, described at least two switching tubes are connected to the connected node of described inductance and described fly-wheel diode jointly, during described switching tube conducting and described inductance form loop, to inductive energy storage, during described switching tube cut-off, described inductance is by described fly-wheel diode and described capacitor discharge, described at least two switching tubes by drive control circuit in turn or alternate conduction, the voltage of the connected node of inductance and fly-wheel diode is controlled by the conducting of described at least two switching tubes or cut-off.
2. circuit of power factor correction as claimed in claim 1, it is characterized in that: described at least two switching tubes by drive control circuit in turn or alternate conduction, be specially, when a switching tube conducting, other switching tubes end, during each switching tube conducting, a switching tube and described inductance or described fly-wheel diode is only had to form loop.
3. circuit of power factor correction as claimed in claim 1, it is characterized in that: described Drive and Control Circuit can set the quantity of the switching tube of alternate conduction according to circuit conditions, in turn or alternate conduction, rest switch pipe is in cut-off state to part switching tube always.
4. circuit of power factor correction as claimed in claim 1, is characterized in that: one end of described inductance is connected with the power positive end for correcting circuit, and the other end of described inductance is connected with the anode of fly-wheel diode; The negative terminal of described fly-wheel diode is connected with the anode of described capacitor; The collector electrode of described switching tube is connected to the node that described inductance is connected with the anode of fly-wheel diode, the emitter of described switching tube is connected with the negative terminal of described capacitor and for the power supply negative terminal of correcting circuit, the base stage of described switching tube is controlled by control circuit, to control conducting and the cut-off of described switching tube.
5. circuit of power factor correction as claimed in claim 1, it is characterized in that: the collector electrode of described switching tube is connected with the power positive end for correcting circuit, the emitter of described switching tube is connected with the negative pole of one end of inductance and fly-wheel diode, the base stage of described switching tube is controlled by control circuit, to control conducting and the cut-off of described switching tube; The other end of described inductance is connected with the anode of capacitor; The anode of described fly-wheel diode and the negative terminal of capacitor are connected to the power supply negative terminal for correcting circuit jointly.
6. circuit of power factor correction as claimed in claim 1, is characterized in that: what described circuit of power factor correction switching tube adopted is igbt transistor, mosfet transistor or BJT transistor.
7. the circuit of power factor correction as described in claim 1-6 item, it is characterized in that: the Drive and Control Circuit of described circuit of power factor correction switching tube, the input terminal voltage sampled signal in the circuit that its control signal is corrected by circuit of power factor correction, output end voltage sampled signal, current sampling signal export after central processing unit logical operation.
8. the circuit of power factor correction as described in claim 1-6 item, is characterized in that: the Drive and Control Circuit of described circuit of power factor correction switching tube comprises voltage comparator, multiplier, current comparator, oscillator, under-voltage locking device, trigger pulse distributor and OR-NOT circuit; Output voltage sampled signal in the circuit that voltage comparator received power factor correcting circuit corrects compares with a reference voltage, an input of the signal input current comparator that the input voltage sampled signal in the circuit that the signal of voltage comparator output and circuit of power factor correction correct exports after multiplier computation, another input of current sampling signal input current comparator in the circuit that circuit of power factor correction corrects, after current comparator relatively, output signal to trigger, trigger produces control signal; Oscillator provides oscillator signal to each unit, on the one hand by trigger reset, the NOR gate of output is pinned on the other hand, then is exactly the clock signal as pulsqe distributor on the one hand; The pulse that pulsqe distributor accepts oscillator distributes control signal according to the order of sequence to each different switching tube; Under-voltage locking device at external power source lower than the power supply closing inner oscillator, multiplier etc. during predetermined value, to guarantee that drive circuit reliably cuts out locking; The signal that signal, the output signal of pulsqe distributor, the signal of oscillator output and under-voltage locking device that wherein trigger produces export exports the control signal as each switching tube respectively through described NOR gate.
9. an AC/DC power translation circuit, it comprises rectification circuit, circuit of power factor correction, wherein AC rectification is become DC pulse electricity by rectification circuit, and described circuit of power factor correction is for correcting the galvanic power factor after rectifier circuit rectifies; Described circuit of power factor correction adopts any one circuit of power factor correction as claimed in claim 7, corrects the power supply after rectification export by the conducting of described at least two switching tubes or the direct voltage of cut-off control inductance, fly-wheel diode and capacitor connected node.
10. an air-conditioner controller, it comprises filter circuit, rectification circuit, power factor correction circuit, Active PFC Drive and Control Circuit, switching power circuit, convertible frequency air-conditioner control chip and IPM drive circuit; Input power after filtering circuit carries out filtering, then carry out through rectification circuit the direct current that rectification becomes pulsation, Rectified alternating current after over commutation becomes stable DC power supply and supplies IPM drive circuit and carry out motor driving after circuit of power factor correction corrects, power to switching power circuit, this switching power circuit provides power supply to convertible frequency air-conditioner control chip and IPM drive circuit simultaneously; The signal that convertible frequency air-conditioner control chip gathers according to the input signal of remote controller and transducer exports control signal, the stepping motor of control indoor set, blower fan, electric expansion valve or output display information, or control IPM drive circuit (Intelligent Power Module) drives the motor of compressor; Wherein said circuit of power factor correction adopts any one circuit of power factor correction as claimed in claim 7.
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| CN201310706074.2A CN104716821A (en) | 2013-12-12 | 2013-12-12 | Air conditioner controller, power conversion circuit of air conditioner controller, and power factor correction circuit |
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| CN201310706074.2A CN104716821A (en) | 2013-12-12 | 2013-12-12 | Air conditioner controller, power conversion circuit of air conditioner controller, and power factor correction circuit |
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| CN104716821A true CN104716821A (en) | 2015-06-17 |
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