CN2713725Y

CN2713725Y - Frequency conversion air-conditioner single tube total control bridge power coefficient corrector

Info

Publication number: CN2713725Y
Application number: CN 200420023182
Authority: CN
Inventors: 杨喜军; 孙承波; 荣亦成
Original assignee: XINYUAN VARIABLE FREQUENCY ELECTRIC APPLIANCE CO Ltd SHANGHAI
Current assignee: XINYUAN VARIABLE FREQUENCY ELECTRIC APPLIANCE CO Ltd SHANGHAI
Priority date: 2004-05-28
Filing date: 2004-05-28
Publication date: 2005-07-27
Anticipated expiration: 2014-05-28

Abstract

The utility model relates to a frequency conversion air-conditioner duplex tube total control bridge power coefficient corrector, which is characterized in that a power supply is connected with the input terminal of a power circuit. One output terminal of the power circuit is connected with one end of a converter circuit, and the other input terminal of the power circuit is connected with the output terminal of a voltage regulating circuit. One output terminal of a calibrating circuit is connected with the other input terminal of the power circuit, and the other output terminal of the power circuit is connected with one input terminal of the calibrating circuit. The other output terminal of the calibrating circuit is connected with the input terminal of a failure detecting circuit, and the output terminal of the failure detecting circuit is connected with the input terminal of a controlling circuit. One output terminal of the controlling circuit is connected with the input terminal of the voltage regulating circuit, and the other output terminal of the controlling circuit is connected with the input terminal of an on/off circuit. The output terminal of the on/off circuit is connected with the other input terminal of the calibrating circuit. The calibrating circuit of the utility model has the technical effects of current continuous mode, average current sampling mode and switch frequency modulation, etc. The utility model has the advantages of simple structure, sound function, fastness and reliability.

Description

A kind of convertible frequency air-conditioner single tube fully controlled bridge power factor corrector

Technical field:

The utility model relates to the convertible frequency air-conditioner power factor corrector, especially for use in AC frequency conversion that adopts the PWM technology or power circuit and the correcting circuit in the active single tube fully controlled bridge of the DC frequency converting air-conditioner booster type power factor corrector.

Background technology:

For a long time, adopt the frequency conversion household electrical appliance of ac-dc-ac inverter device as the transmission power supply, for example adopt convertible frequency air-conditioner, frequency conversion refrigerator and the variable-frequency washing machine etc. of PWM AC/DC converter technique, all adopt the power prime of traditional uncontrollable rectifier as frequency converter, being responsible for backward, the level inverter provides direct voltage, thereby bring following problem inevitably: (1) Harmonics of Input content is big, causes serious electric network pollution; (2) the electrical network utilance descends, and is forced to strengthen the rated capacity of individual metablocks device; (3) the DC loop voltage fluctuation is bigger, the output performance of influence back level inverter; (4) the frequency conversion household electrical appliance have a large capacity and a wide range, and market prospects are considerable, and its influence will be more serious.These have caused the great attention of countries in the world and some internal authority tissue, in order to adapt to the household electrical appliances market operation of accession to WTO back, State Quality Supervision Bureau issues the documents, require to rise on May 1st, 2003 in household appliance technical field coming into effect the 3C authentication, wherein just comprise relevant EMC authentication.An importance that satisfies the EMC authentication is exactly to make the frequency conversion household electrical appliance satisfy specified standard to harmonic current number of times and the content that electrical network injects.Original AC/DC conversion prime scheme based on uncontrollable commutation technique is suitable no longer fully in more powerful frequency conversion household electrical appliance like this, and must adopt power factor correction.Feasible correcting scheme has following two kinds substantially at present: (1) passive correcting scheme; (1) part active correction scheme; (2) complete active correction scheme.Wherein, passive correcting scheme need adopt expensive and bulky passive devices such as inductance, electric capacity, diode, resonance reactor or power resistor, bring many problems inevitably, authenticate in order to satisfy EMC as (1), device parameters is excessive, makes pressure drop excessive, causes the line voltage utilance to reduce greatly, the air-conditioning ability of exerting oneself reduces, and directly influences user's serviceability; (2) power factor correction weak effect, though low-order harmonic content is up to standard, amplitude is still higher.The calibration result of part active correction scheme is also relatively poor, needs to increase microcontroller and participates in computing, the application scenario that a suitable power is little; The active correction scheme generally all adopts basic booster type active correction scheme fully, and calibration result is fine, can derive multiple correcting scheme again based on this correction principle, and each scheme has different characteristics again.For more powerful correcting scheme, if adopt basic booster type scheme, will cause the selection of boost inductance, power diode and power switch to encounter difficulties, make fringe cost excessive, reduce consumer's purchase enthusiasm.Therefore, how to select to obtain optimal circuit configuration and obtain the key component link that cost performance preferably just becomes design.

Summary of the invention:

The purpose of this utility model is that a kind of novel single-phase active power factor corrector will be provided, and is called for short the PFC scheme, and it goes for various frequency conversion domestic air conditionings, also is applicable to other frequency-conversion domestic electric appliances, and has characteristic of simple structure.

For achieving the above object, the technical solution of the utility model is: the two-tube fully controlled bridge power factor corrector of a kind of convertible frequency air-conditioner, it mainly comprises housing, be contained in the adjuster in the housing, it is characterized in that: the circuit connecting relation of described adjuster is, power supply is connected with an input of power circuit, one output of power circuit is connected with an end of frequency changer circuit, the another one input of power circuit is connected with the output of regulating circuit, one output of correcting circuit is connected with the another input of power circuit, and another output of power circuit is connected with an input of correcting circuit; Another output of correcting circuit is connected with the input of failure detector circuit, the output of failure detector circuit is connected with the input of control circuit, one output of control circuit is connected with the input of regulating circuit, another output of control circuit is connected with the input of start and stop circuit, and the output of start and stop circuit is connected with another input of correcting circuit.

The utility model adopts single tube fully controlled bridge rectification circuit to cooperate the AC boosting inductance to replace original basic booster type corrected power circuit, and with original correcting controller process appropriate reconstruction, just can constitute novel Active Power Factor Correction scheme, be called for short PFC, correcting circuit in the utility model has technique effects such as continuous current mode, average current sample mode and switching frequency modulation, in addition, the utility model also and have an advantage of simple in structure, perfect in shape and function, fast and reliable.

Description of drawings:

Fig. 1 is a circuit block diagram of the present utility model

Fig. 2 is the circuit diagram of the utility model one embodiment

Embodiment:

The invention will be further described below in conjunction with drawings and Examples.

The utility model comprises power circuit 1, correcting circuit 2, start and stop circuit 3, regulating circuit 4 and failure detector circuit 5, and supporting part has control circuit 6, single phase poaer supply 7 and frequency changer circuit 8.In the enforcement, the other end ground connection of frequency changer circuit, power circuit has an output to be connected with an input of correcting circuit and failure detector circuit respectively.Described power circuit annexation is, the two ends of ac capacitor C1 are connected with two inputs of coupling inductance L1 respectively, the common port of the diode that two outputs of coupling inductance L1 are connected with four bridge-types respectively, the anode of two power diodes is connected, the negative terminal of two power diodes all with capacitor C 2, electrochemical capacitor E1, resistance R 4, one end of resistance R 7 connects, the diode D1 that bridge-type connects, the anode of diode D2 is connected with an end of resistance R 1, the end of resistance R t is connected with the base stage of power switch transistor PS1, the emitter of power switch transistor PS1 and resistance R 1, the other end of resistance R t, capacitor C 2, the other end of electrochemical capacitor E1, resistance R 2, the other end of resistance R 5 is connected and ground connection, the diode D3 that the collector electrode of power switch transistor PS1 is connected with bridge-type, the negative terminal of diode D4 connects, one end of resistance R 3 is connected with the other end of resistance R 4, the other end of resistance R 3 is connected with an end of resistance R 2, one end of resistance R 6 is connected with the other end of resistance R 7, and the other end of resistance R 6 is connected with an end of resistance R 7.In the power circuit two of coupling inductance L1 outputs also respectively with correcting circuit in resistance R 11, resistance R 13, the common port of resistance R 17, resistance R 12, resistance R 15, resistance R 21, the common port of resistance R 23 links to each other, the anode of the base stage of power switch transistor PS1 and the diode D5 in the correcting circuit, one end of resistance R 8 connects, the diode D1 that bridge-type connects, the anode of diode D2 also with correcting circuit in an end of resistance 8, the pin 8 of correcting chip L4981AB and the resistance R in the failure detector circuit 35 link to each other, the overvoltage of correcting chip L4981AB in the power circuit in an end of resistance R 2 and the correcting circuit detects pin 3 and is connected, an end of resistance R 5 and the resistance R 27 in the correcting circuit in the power circuit, the pin 14 of the other end of capacitor C 10 and correcting chip L4981AB, and the capacitor C in the regulating circuit 14, electrochemical capacitor E3, one end of resistance R 33 links to each other.The two ends of ac capacitor C1 are connected with the two ends of AC power 7 respectively in the power circuit 1;

In the ∧ correcting circuit 2 in the power pins 15 of correcting chip L4981AB and the start and stop circuit 3 R61 link to each other with the common port of R62;

Resistance R 57 links to each other with the start and stop pin OPEN of control circuit 6 with the common port of optocoupler OP4 pin 1 in the ∧ start and stop circuit 3;

Resistance R 31 links to each other with the start and stop pin VREG of control circuit 6 with the common port of optocoupler OP1 pin 1 in the ∧ regulating circuit 4;

Resistance R 56 links to each other with the external interrupt XINT1 of control circuit 6 with the common port of triode TR1 emitter in the ∧ failure detector circuit 5;

Optical coupling secondary edges part, failure detector circuit 5 optocouplers former limit part and frequency changer circuit 8 GND1 altogether in power circuit 1, correcting circuit 2, start and stop circuit 3 and the regulating circuit 4, be common port N, the former limit of optocoupler part, failure detector circuit 5 optical coupling secondary edges GND2 altogether partly more than arranges promptly to constitute isolation scheme in control circuit 6, start and stop circuit 3 and the regulating circuit 4.If ground GND1 and ground GND2 are coupled together, then constitute thermally scheme.

The utility model is because power circuit 1 adopts single tube fully controlled bridge structure, and brings many advantages: (1) boost inductance is positioned at AC side, is the AC coupled inductance, thereby needn't consider original D.C. magnetic biasing problem that inductance is positioned at inductance after the rectifier bridge that is positioned at; (2) number of leads reduces, and is convenient to the pfc circuit power modelization; (3) original correcting circuit only needs suitably to change, and other circuit need not to revise just can finish the PFC function.Modular result is that safe and reliable, cost descends, EMC is effective, and is convenient to install and use.

In the power circuit 1, the full power cycle of power switch PS1, but FRD1 and FRD2, D5 and D6 switch once every half power cycle, and therefore for exporting with constant power, the temperature rise of power switch descends, and contact capacity can suitably descend; Because the design ratio of AC inductance is easier to, heating can be controlled, and makes inductive material can utilize cheap ferrite, alloy powder core etc. to replace expensive various amorphous materials; Inductive current detects and still adopts shunt resistance R1 mode, can reduce cost; In order to reduce loss, power diode FRD1 and FRD2 select reverse quick soft-recovery type;

Correcting circuit 2 is based on PFC special integrated circuit L4981A or L4981AD and peripheral circuit, designed one according to this chip design handbook and overlapped the peripheral parameter that satisfies convertible frequency air-conditioner (22 machines～65 machines) correcting circuit, not only can satisfy the wide output power range 0.2kW～4.0kW and the wide input voltage range 90VAC～270VAC job requirement of convertible frequency air-conditioner, and satisfy the requirement of 3C authentication about EMC;

Start and stop circuit 3 is responsible for receiving the start stop signals from control circuit 6 start and stop pin OPEN, is responsible for start and stop and stops the work of correcting circuit;

Regulating circuit 4 is responsible for receiving the PWM pressure regulation signal from control circuit 6 pin VREG, finally the voltage of the Voltage Feedback pin 14 by regulating correcting circuit 2 driving pulse of regulating correcting circuit 4 sends rule, thereby regulate the output dc voltage of power circuit 1, can realize the pressure regulation ability of convertible frequency air-conditioner DC link and the soft start and stop and the soft stop function of realization PFC convertible frequency air-conditioner thus, not only can improve the air-conditioning system performance, and eliminate impact electrical network;

Whether failure detector circuit 5 is responsible for occurring the line under-voltage state whether occurring in overcurrent and overvoltage condition and the correcting circuit in the detection power circuit 1, and will be passed to control circuit 6 for information about, for further handling;

Control circuit 6 is responsible for sending start stop signal and pressure regulation signal when condition satisfies, and catches fault-signal.

In sum, the design of this convertible frequency air-conditioner has multiple spot innovation part, the operating mode and the performance of convertible frequency air-conditioner have not only been improved, and satisfy 3C authentication EMC requirement, has the high advantage of cost performance, be in particular in following some: (1) dual BOOST PFC power circuit not only can be realized the Active Power Factor Correction of convertible frequency air-conditioner, and can reduce the stress of components and parts greatly and reduce the cost of power circuit; (2) correcting circuit 2 has very the peripheral Control Parameter that adapts to, and can satisfy the requirement of wide input voltage and wide power output, and can the unit's of acquisition input power factor; (3) start and stop circuit 3 has simple and novel features, reliably start and stop with stop correcting circuit 2 and power circuit 1 output voltage level; (4) regulating circuit 4 has simple and novel features equally, can regulate the direct voltage size of PFC power circuit 2 outputs in a wide range, can realize soft start and stop and soft stop and operation pressure regulation ability.

Below the interlock circuit in the utility model also being reached accompanying drawing in conjunction with the embodiments is described in further detail:

Power circuit 1 in the utility model mainly is made up of ac filter link, the AC inductance of boosting, rectifier bridge, power switch, shunt resistance, DC filtering link and voltage measurement link.Wherein, the ac filter link is made up of C1, and C1 and single phase alternating current power supply VS are in parallel; The AC inductance of boosting is made up of coupling inductance L1, and L1 connects into the differential mode coil mode, and

L1 input terminal

1,2 forms in parallel with C1; Rectifier bridge recovers power diode FRD1 and FRD2, two common anode power diode D1 of routine and D2 by the snap back of two common cathodes to be formed, and four power diodes connect into traditional single-phase bridge structure.The negative electrode of FRD1 and FRD2 connects and composes common port P, the anode of D1 and D2 connects and composes common port N1, FRD1 anode, D1 negative electrode, PS1 drain electrode constitute a common port B1 with L1 terminal 3, and FRD2 anode, D2 negative electrode, PS2 drain electrode form another common port B2 with L1 terminal 4.In addition, resistance R 15, R21 link to each other with the R23 common port in common port R and the correcting circuit 2, and resistance R 11, R13 link to each other with the R17 common port in common port S and the correcting circuit 2; Power switch is made up of a power IGBT (or MOSFET) PS1, and its source electrode links to each other with ground GND1.The PS1 drain electrode links to each other with the negative electrode of D3, D4, and the anode of resistance R 8 and diode D5 links to each other in PS1 source electrode and the correcting circuit 2; The end of resistance R G links to each other with the gate pole G1 of PS1, its other end ground connection GND1, and shunt resistance is made up of R1, and R1 one end connects common port N1, and the other end connects ground GND1, common port N1.

The DC filtering link is made of capacitor C 2, electrochemical capacitor E1, and C2 is parallel between common port P, the N, the anodal common port P that connects of E1, and the E1 negative pole connects common port N.

The voltage measurement link is made up of resistance R 2～R7, and wherein R2～R4 is connected in series between common port P and the N successively, and R2 forms a common port with R3 and links to each other with the overvoltage detection pin 3 of correcting circuit 2.R5～R7 is connected in series between common port P and the N successively, and R5 and R6 form a common port and link to each other with the Voltage Feedback pin 14 of correcting circuit 2, links to each other with resistance R 33, capacitor C 14, the common port of electrochemical capacitor E14 formation in the regulating circuit 4 simultaneously.Common port P, N respectively with frequency changer circuit 8 in positive pole+with negative pole-link to each other.

Its operation principle is, the basic functional principle of the power circuit 1 in this utility model is identical with the principle of traditional voltage lifting PFC, be described below: (1) AC power 7 positive half cycles: after receiving drive signal from correcting circuit 1 and acting on the gate pole of PS1, during the PS1 conducting, VS1 short circuit under inductance L 1 effect, the electric current of L1 rises, store electrical energy.When PS1 turn-offed, L1 responded to high pressure, and the energy of storing is discharged among the electrochemical capacitor E1 by FRD1.(2) AC power 7 negative half periods: after receiving drive signal from correcting circuit 1 and acting on the gate pole of PS1, the PS1 conducting, VS1 short circuit under inductance L 1 effect, the reverse current of L1 rises, store electrical energy.When PS1 turn-offed, L1 reverse induction high pressure was discharged into the energy of storing among the electrochemical capacitor E1 by FRD2.Carry out so repeatedly, on E1, obtain the direct voltage that ripple voltage meets the demands, use for frequency changer circuit 8, and frequency changer circuit 8 produces three-phase PWM line voltage to use for the induction motor rotation under the control of control circuit 6, drive load compressor work.The input current waveform that makes power supply 1 simultaneously is a sinusoidal waveform, and synchronous with input voltage, realizes approaching 1 power factor.Capacitor C plays input current filter action and differential mode interference inhibitory action, and capacitor C 2 plays the effect that reduces the DC loop voltage jump.In addition, when operate as normal, power circuit 1 will provide the input current reference waveform to correcting circuit 2, this part by L1 after the level two lead-in wires finish by supply voltage being introduced correcting circuit 2.Power circuit 1 will provide the direct voltage overvoltage signal and the voltage feedback signal of output to correcting circuit 2 simultaneously, and binary signal is provided by the extraction voltage of resistance R 2 with R5 respectively.In addition, power circuit 1 also will provide over-current signal to correcting circuit 2, and this signal is provided by the extraction voltage of resistance R 1.

In the utility model correcting circuit 2 mainly by control chip L4981AB and on every side control circuit form.Wherein L4981AB is a boost type PFC kernel control chip, amounts to 20 pins, mainly adopts the operation principle of continuous current mode of operation and average current sample mode, and L4981A adopts fixed switching frequency, and L4981B adopts the modulation switch frequency; Correcting chip IC1 is L4981AL4981B, and the signal ground of L4981AB is 10 pin, and power supply ground is 1 pin, and signal ground all links to each other with GND1 with power supply ground.Power supply is 19 pin, and rated voltage is+15VDC; Line under-voltage detects and is pin 15; Synchronism link is made up of with R12 resistance R 11, and R11 links to each other with B2 with common port B1 respectively with each end of R12, and the other end all links to each other in the pin 16 of L4981AB; Exchange input element and be made up of resistance R 13～R15 and capacitor C 3, R14, R16 form a common port with C3 and link to each other with pin 4, and R11 links to each other with common port B2 with R12 series connection back one end, and the other end links to each other with pin 4.R15 links to each other with common port B2 with R16 series connection back one end, and the other end links to each other with pin 4.C3 one end links to each other with ground GND1, and the other end links to each other with pin 4; The effective value link is made up of resistance R 16～R20, capacitor C 3～C6, and the end after R17～R19 series connection back and C1, the R20 parallel connection links to each other with pin 7, the other end after C1, the R20 parallel connection be connected in GND1.R21, R22 link to each other with common port B1 with C5 series connection back one end, and the other end links to each other with ground GND1.R23, R24 link to each other with common port B1 with C6 series connection back one end, and the other end links to each other with ground GND1, and R24 links to each other with power supply+15VDC with the common port of C6 in addition; The power supply link is made up of with E2 capacitor C 7, and an end links to each other with pin 19 after C7 and the E2 parallel connection, and the other end links to each other with pin 1; Driving link is made up of resistance R 8, diode D5.The gate pole of PS1 in the anode termination power circuit 1 of R8 and D5 after D5 is in parallel, another cathode terminal links to each other with the pin 20 of IC1 L4981AB; The over-current detection link is made up of R28, R29 and C11, and R28 one end links to each other with pin 8, and the other end links to each other with pin 2.R29 one end links to each other with pin 2, and the other end links to each other with pin 11.C11 one end links to each other with pin 6, other end ground connection GND1.C11 one end links to each other with pin 6, other end ground connection GND1.Pin 11 links to each other with pin 6, pin 11 output reference voltages+5.1VDC; Oscillation element is made up of R30, C12, and R30 one end links to each other with pin 17, and the other end connects GND1.C12 one end links to each other with pin 18, and the other end connects GND1; Soft start and stop link is made up of capacitor C 13, and C13 one end links to each other with pin 12, and the other end connects GND1.Pin 12 links to each other with R47 in the failure detector circuit 5;

Overvoltage detects link to be made up of pin 3, and pin 3 links to each other with the common port of R2, R3 in the power circuit 1; The voltage-regulation link is made up of with C10 resistance R 7, and an end links to each other with pin 13 after R7 and the C10 parallel connection, and the other end links to each other with pin 14; The Current Regulation link is made up of resistance R 25, R26, C8 and C9, and an end links to each other with C8 after R25 and the C9 parallel connection, and the end of other end pin 9 and R26 links to each other, and the other end of C8 connects pin 5, and the other end of R26 connects GND1.

If its operation principle is sent enabling signal for start and stop circuit 3, after making L4981AB pin 15 obtain triggering level, accepting on alternating current reference waveform that power circuit 1 provides, Voltage Feedback model, over-current signal, the overvoltage basis of signals, correcting chip L4981AB produces a final drive signal through computing in the sheet, drive signal is done after the current-sharing, sends into power circuit 1 driving power device PS1 and PS2.Automatically close the PWM drive signal when simultaneously start and stop circuit 3 also is responsible for over current fault, and+force L4981AB pin 12 to be in low level state when 15VDC line under-voltage and output dc voltage overvoltage, for failure detector circuit 5 provides overcurrent and under-voltage overvoltage signal.

Start and stop circuit 3 in the utility model mainly is made up of optocoupler OP4 and peripheral components thereof.Wherein: the simple pin 1 of optocoupler OP4 links to each other with an end of resistance R 57, and links to each other with the pressure regulation pin VREG of control circuit 6.The simple pin 2 of optocoupler OP4 links to each other with an end of resistance R 58, and R58 is connected ground GND2 with the other end of R57; The secondary pin 3 of optocoupler OP4 links to each other with the base stage of an end of resistance R 59 with PNP triode TR2, and the secondary pin 4 of optocoupler OP4 links to each other with power supply+15VDC with an end of resistance R 60; The other end of resistance R 60 links to each other with an end of resistance R 61 and the emitter of triode TR2, the other end of R61 links to each other with an end of resistance R 62 and constitutes a common port and link to each other the other end of R62 and R59, the equal ground connection GND1 of the collector electrode of TR2 with the pin 15 of correcting circuit 2.

L4981AB can not work than the under-voltage limit value of low level less than the L4981AB internal rules if its operation principle, forces resistance R 62 one of output for control circuit 6 pin VREG send simple ending of the flat OP4 of low electric light coupling, sends cut-off signals all the time.If control circuit 6 pin VREG send the simple conducting of high level OP4, force the under-voltage limit value of higher level of resistance R 62 outputs greater than the L4981AB internal rules, L4981AB just may work, and sends drive signal.This mechanism guarantees that whole system powered on moment correcting circuit do not work, and power circuit is in the natural commutation state, avoids system to be impacted and destroys.

Regulating circuit 4 in the utility model mainly is made up of optocoupler OP1 and peripheral components thereof.Wherein: the simple pin 1 of optocoupler OP1 links to each other with an end of resistance R 31, and links to each other with the pressure regulation pin OPEN of control circuit 6.The simple pin 2 of optocoupler OP4 links to each other with the other end of resistance R 31 and is connected ground GND2; The simple pin 4 of optocoupler OP1 links to each other with an end of resistance R 31, after linking to each other with the anode of capacitor C 14 and electrochemical capacitor E3, the other end of R31 links to each other the minus earth GND1 of the simple pin 4 of optocoupler OP1, the other end of C14 and E3 with the resistance R 5 of power circuit 1, the common port of R6.

After its operation principle is the PWM pressure regulation signal of reception from the different duty of control circuit 7, change the equivalent resistance at the two ends of resistance R 5 in the power circuit 1, make electrochemical capacitor E3 terminal voltage change along with the change of duty ratio, thereby change the pressure regulation voltage signal size of the pin 14 of L4981AB in the correcting circuit 2, finally realize voltage regulation function through changing the duty ratio of PWM drive signal after the computing by L4981AB.

Failure detector circuit 5 in the utility model is mainly detected link and is virtually connected to detect by over-current detection, under-voltage overvoltage and constitutes, and wherein: the over-current detection link comprises that resistance R 34～R46, diode D5, amplifier AM1～AM2, comparator AM4, optocoupler OP2 and capacitor C 15～C16 form.The in-phase input end of AM1 links to each other with the end of R34, the other end ground connection GND1 of R34.The inverting input of AM1 links to each other with the end of R35, R36, and the other end of R35 links to each other with the pin 8 of the L4981AB of correcting circuit 2, and the end of the other end of R36, R37 all links to each other with the output of AM1.The other end of R37 links to each other with the end of C15 and R38, and the other end of C15 links to each other with the output of AM2, and the end of the other end of R38, C16 links to each other with the in-phase input end of AM2, the other end ground connection GND1 of C16.The inverting input of AM2 links to each other with the end of R39, R40, and the other end of R39 links to each other with the output of AM2, and the other end of R40 connects ground GND1.The end of R41 links to each other with the output of AM2, and the other end links to each other with the in-phase input end of AM4.The end of R43 links to each other with power supply+15VDC, and the other end links to each other with the end of R42, R44, and the other end of R42 links to each other with the reverse input end of AM4, the other end ground connection GND1 of R44.The end of R45 links to each other with the output of AM4, and the other end links to each other with the pin 2 of OP2, the pin 1 connection+15VDC of OP2.The end of R46 links to each other with+5VDC, and the other end links to each other with the pin 4 of OP2, the anode of D5, the pin 3 ground connection GND2 of OP2; Under-voltage overvoltage detects link and comprises that resistance R 47～R54, diode D6, amplifier AM3, comparator AM5, optocoupler OP3 form.The in-phase input end of AM3 links to each other with the end of R47, and the other end of R47 links to each other with the pin 12 of the L4981AB of correcting circuit 2, and the inverting input of AM3 links to each other the other end ground connection GND1 of R48 after linking to each other with output with an end of resistance R 48.The end of R51 links to each other with the output of AM3, and the other end links to each other with the reverse input end of AM5.The end of R49 links to each other with power supply+15VDC, and the other end links to each other with the end of R50, R52, and the other end of R52 links to each other with the in-phase input end of AM5, the other end ground connection GND1 of R50.The end of R53 links to each other with the output of AM4, and the other end links to each other with the pin 2 of OP3, the pin 1 connection+15VDC of OP3.The end of R54 links to each other with+5VDC, and the other end links to each other with the pin 4 of OP3, the anode of D6, the pin 3 ground connection GND2 of OP3; Virtually connect to detect and comprise that resistance R 55～R56, capacitor C 17～C18, NPN triode TR1 form, the collector electrode of the end of R55, the end of C17, TR1 links to each other with the negative electrode of D5, D6 after linking to each other, the other end of R55 connects+5VDC with the collector electrode of TR1, the other end ground connection GND2 of C17.The end pin INT1 of back and control circuit 6 that links to each other with the emitter of TR1 after C18 and the R56 parallel connection, other end ground connection GND2.

Its operation principle is that (1) is if under-voltage overvoltage fault, pin 12 voltages of L4981AB drop to about zero in the correcting circuit 2, through behind the amplifier AM3 voltage follow in the failure detector circuit 5 and relatively back optocoupler OP3 conducting of comparator AM5, NPN triode TR1 ends like this, and low level of emitter output is delivered to control circuit 6 pin INT1, causes the fault interruption, in interrupt service subroutine, send low level by pin OPEN immediately, close start and stop circuit 3, close correcting circuit 2.If under-voltage overvoltage fault do not occur, pin 12 voltages of L4981AB are high level in the correcting circuit 2, through behind the amplifier AM3 voltage follow in the failure detector circuit 5 and relatively back optocoupler OP3 conducting of comparator AM5, NPN triode TR1 conducting like this, high level of emitter output is delivered to control circuit 6 pin INT1, do not cause the fault interruption, do not close correcting circuit 2; (2) if over current fault, pin 8 voltages of L4981AB increase to a threshold value in the correcting circuit 2, this signal is delivered to the input of the resistance R 35 of failure detector circuit 5, through after the following of amplifier AM1, after the two rank filters of this signal through the AM2 formation, send into comparator AM4, relatively back optocoupler OP3 conducting, NPN triode TR1 ends like this, and low level of emitter output is delivered to control circuit 6 pin INT1, causes the fault interruption, in interrupt service subroutine, send low level by pin OPEN immediately, close start and stop circuit 3, close correcting circuit 2.If over current fault do not occur, pin 8 voltages of L4981AB are less than a threshold value in the correcting circuit 2, this signal is delivered to the input of the resistance R 35 of failure detector circuit 5, through after the following of amplifier AM1, after the two rank filters that this signal constitutes through AM2, send into comparator AM4, relatively back optocoupler OP3 ends, NPN triode TR1 conducting like this, and high level of emitter output is delivered to control circuit 6 pin INT1, do not cause the fault interruption, do not close correcting circuit 2.

Above-mentioned resistance R 1～R30 of the present utility model should be high accuracy (1%) resistance, the parameter of capacitor C 3～C13 should be high accuracy (1%) electric capacity, owing in original convertible frequency air-conditioner circuit, increased power factor correction (PFC) part, comprised and adopt power circuit 1, effect positive circuit 2, start and stop circuit 3, regulating circuit 4 and failure detector circuit 5.Because power device is combined in the rectifier bridge in the power circuit, make the power circuit designs simplification, be convenient to the integrated and reduction volume of power more, and boost inductance is positioned at AC side, make that the design of boost inductance is simpler, needn't consider the D.C. magnetic biasing problem, help the selection and the inductor design of core material.The start and stop circuit can start and stop correcting circuit work on demand, and regulating circuit can be regulated the DC link output voltage level arbitrarily, and has soft start and soft stop function.Failsafe link is the state of detection power circuit voltage and electric current accurately, and feeds back to control circuit.All these functions all can be controlled by control circuit, thus have that correcting feature is good, complete function, novel structure, safe and reliable, the advantage that the bulking property price ratio is high is applicable to the power factor correction of various convertible frequency air-conditioners, has promotional value.

Claims

1, a kind of convertible frequency air-conditioner single tube fully controlled bridge power factor corrector, it mainly comprises housing, be contained in the adjuster in the housing, it is characterized in that: the circuit connecting relation of described adjuster is, power supply is connected with an input of power circuit, one output of power circuit is connected with an end of frequency changer circuit, the another one input of power circuit is connected with the output of regulating circuit, one output of correcting circuit is connected with the another input of power circuit, and another output of power circuit is connected with an input of correcting circuit; Another output of correcting circuit is connected with the input of failure detector circuit, the output of failure detector circuit is connected with the input of control circuit, one output of control circuit is connected with the input of regulating circuit, another output of control circuit is connected with the input of start and stop circuit, and the output of start and stop circuit is connected with another input of correcting circuit.

2, a kind of convertible frequency air-conditioner single tube fully controlled bridge power factor corrector according to claim 1 is characterized in that: the other end ground connection of frequency changer circuit, power circuit have an output to be connected with an input of correcting circuit and failure detector circuit respectively.

3, a kind of convertible frequency air-conditioner single tube fully controlled bridge power factor corrector according to claim 1, it is characterized in that: described power circuit annexation is, the two ends of ac capacitor (C1) are connected with two inputs of coupling inductance (L1) respectively, the common port of the diode that two outputs of coupling inductance (L1) are connected with four bridge-types respectively, the anode of two power diodes is connected, the negative terminal of two power diodes all with electric capacity (C2), electrochemical capacitor (E1), resistance (R4), one end of resistance (R7) connects, the diode (D1) that bridge-type connects, the anode of diode (D2) is connected with an end of resistance (R1), one end of resistance (Rt) is connected with the base stage of power switch transistor (PS1), the emitter of power switch transistor (PS1) and resistance (R1), the other end of resistance (Rt), electric capacity (C2), the other end of electrochemical capacitor (E1), resistance (R2), the other end of resistance (R5) is connected and ground connection, the diode (D3) that the collector electrode of power switch transistor (PS1) is connected with bridge-type, the negative terminal of diode (D4) connects, one end of resistance (R3) is connected with the other end of resistance (R4), the other end of resistance (R3) is connected with an end of resistance (R2), one end of resistance (R6) is connected with the other end of resistance (R7), and the other end of resistance (R6) is connected with an end of resistance (R7).

4, according to claim 1 or 3 described a kind of convertible frequency air-conditioner single tube fully controlled bridge power factor correctors, it is characterized in that: two outputs of coupling inductance in the power circuit (L1) also respectively with correcting circuit in resistance (R11), resistance (R13), the common port of resistance (R17), resistance (R12), resistance (R15), resistance (R21), the common port of resistance (R23) links to each other, the anode of the base stage of power switch transistor (PS1) and the diode in the correcting circuit (D5), one end of resistance (R8) connects, the diode (D1) that bridge-type connects, the anode of diode (D2) also with correcting circuit in an end of resistance (R8), resistance (R35) in correcting chip (pin 8 of L4981AB) and the failure detector circuit links to each other, correcting chip in one end of resistance in the power circuit (R2) and the correcting circuit (overvoltage of L4981AB detects pin 3) is connected, one end of resistance in the power circuit (R5) and the resistance (R27) in the correcting circuit, the other end of electric capacity (C10), correcting chip (pin 14 of L4981AB), and the electric capacity in the regulating circuit (C14), electrochemical capacitor (E3), one end of resistance (R33) links to each other.