CN202737735U - Main power source circuit of variable-frequency air conditioner - Google Patents
Main power source circuit of variable-frequency air conditioner Download PDFInfo
- Publication number
- CN202737735U CN202737735U CN2012202678720U CN201220267872U CN202737735U CN 202737735 U CN202737735 U CN 202737735U CN 2012202678720 U CN2012202678720 U CN 2012202678720U CN 201220267872 U CN201220267872 U CN 201220267872U CN 202737735 U CN202737735 U CN 202737735U
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- China
- Prior art keywords
- circuit
- factor correction
- frequency air
- power factor
- rectifier bridge
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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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Abstract
The utility model provides a main power source circuit of a variable-frequency air conditioner. The main power source circuit includes an inverter, a filtering circuit, a power factor correction circuit, a rectifier bridge and an electrolytic capacitor. The power factor correction circuit is a parallel circuit formed by a reactor and a capacitor; two alternating current input ends of the rectifier bridge are respectively connected with an output end of the filtering circuit which is externally connected with an alternating current power source; a direct current output end of the rectifier bridge is connected with an input end of the power factor correction circuit; an output end of the power factor correction circuit is connected with a positive pole of the electrolytic capacitor and an input end of the inverter of the main power source circuit of the variable-frequency air conditioner respectively; another direct current output end of the rectifier bridge is connected with a negative pole of the electrolytic capacitor and the input end of the inverter; and an output end of the inverter is connected with a compressor of the variable-frequency air conditioner. According to the main power source circuit of the utility model, the cost of an overall unit can be effectively reduced through adding the power factor correction circuit, and at the same time, the reliability of the power factor correction circuit is greatly improved, thereby enabling the variable-frequency air conditioner to meet the requirement of national standards for limiting harmonics.
Description
Technical field
The utility model relates to the technical field of convertible frequency air-conditioner circuit, refers in particular to a kind of main power circuit of convertible frequency air-conditioner.
Background technology
Known in the industry, existing convertible frequency air-conditioner is owing to having adopted rectifier bridge to transfer alternating current to direct current, so that there are the problems such as power factor is low, harmonic wave is large in it.At present, general solution is to adopt active-mode active digital PWM control circuit, be the disclosed technical scheme-active power factor corrector of utility model patent of CN200620087045 such as the patent No., although this scheme can satisfy instructions for use, it exists, and circuit complexity, poor reliability, Electro Magnetic Compatibility are poor, the high in cost of production shortcoming.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of main power circuit of reliable, convertible frequency air-conditioner that cost is low reasonable in design is provided.
For achieving the above object, technical scheme provided by the utility model is: a kind of main power circuit of convertible frequency air-conditioner, it includes inverter, filter circuit, circuit of power factor correction, rectifier bridge, electrochemical capacitor, wherein, the parallel circuits of described circuit of power factor correction for being consisted of by reactor and electric capacity, two ac input ends of rectifier bridge join with the output of the filter circuit of external AC respectively, one direct current output of this rectifier bridge and the input of circuit of power factor correction join, the output of this circuit of power factor correction joins with the positive pole of the electrochemical capacitor of the main power circuit of this convertible frequency air-conditioner and the input of inverter respectively, simultaneously, another dc output end of rectifier bridge joins with the negative pole of electrochemical capacitor and the input of inverter respectively, and the compressor of the output of this inverter and convertible frequency air-conditioner joins.
Described electric capacity is electrodeless electric capacity.
The utility model is after having adopted such scheme, its great advantage is that the utility model can effectively reduce the complete machine cost by the circuit of power factor correction of setting up, simultaneously, because this circuit of power factor correction is to be formed by a reactor and Capacitance parallel connection, owing to there not being the control of digital circuit and HF switch pipe, cause its reliability to be greatly improved, thereby so that convertible frequency air-conditioner meet GB to the requirement for restriction of harmonic wave.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Fig. 2 is for being used for the result schematic diagram that the convertible frequency air-conditioner below 1.5 is tested with the utility model.
Embodiment
The utility model is described in further detail below in conjunction with specific embodiment.
Shown in accompanying drawing 1, the main power circuit of the described convertible frequency air-conditioner of the present embodiment, it includes inverter 1, filter circuit 2, circuit of power factor correction 3, rectifier bridge B1, electrochemical capacitor C2, wherein, the parallel circuits of the described circuit of power factor correction 3 of the present embodiment for being consisted of by reactor L1 and electrodeless electric capacity C1, two ac input ends of rectifier bridge B1 join with the output of the filter circuit 2 of external AC respectively, the direct current output of this rectifier bridge B1 and the input of circuit of power factor correction 3 join, the output of this circuit of power factor correction 3 joins with the positive pole of the electrochemical capacitor C2 of the main power circuit of this convertible frequency air-conditioner and the input of inverter 1 respectively, simultaneously, another dc output end of rectifier bridge B1 joins with the negative pole of electrochemical capacitor C2 and the input of inverter 1 respectively, and the compressor 4 of the output of this inverter 1 and convertible frequency air-conditioner joins.Below be the specific works principle of the main power circuit of the above-mentioned convertible frequency air-conditioner of the present embodiment: when supply voltage during greater than DC bus-bar voltage Uo, rectifier bridge B1 conducting, electric current charges to electrochemical capacitor C2 by reactor L1, after supply voltage reaches maximum, when being lower than gradually DC bus-bar voltage Uo, because the afterflow effect of reactor L1, electric current can continue to charge to electrochemical capacitor C2, simultaneously, because the reduction of Ui, when Ui＜Uo, electric current also can charge to electrodeless electric capacity C1, the left end that makes electrodeless electric capacity C1 is for negative, and right-hand member is for just.When raising gradually after the supply voltage zero passage in next cycle, when satisfying Ui+Uc〉during Uo, electric current begins by electrodeless electric capacity C1 to electrochemical capacitor C2 charging, so rectifier bridge B1 shorting advance, electric current is inputted in advance.When supply voltage is elevated to Ui〉during Uo, electrodeless electric capacity C1 finishes discharge, electric current begins to charge to electrochemical capacitor C2 by reactor L1, because reactor L1 makes rectifier bridge B1 postpone cut-off, electrodeless electric capacity C1 makes rectifier bridge B1 shorting advance, thereby the distribution of in the supply voltage half-wave, having widened electric current, therefore improved power factor, reduced the odd harmonic component value.In a word, after adopting above scheme, when this main power circuit was used for convertible frequency air-conditioner below 1.5, power factor can reach more than 0.9, and the Harmonic value all meets the GB requirement, and its test result is specifically referring to shown in the accompanying drawing 2.
The examples of implementation of the above are the preferred embodiment of the utility model only, are not to limit practical range of the present utility model with this, therefore the variation that all shapes according to the utility model, principle are done all should be encompassed in the protection range of the present utility model.
Claims (2)
1. the main power circuit of a convertible frequency air-conditioner, it is characterized in that: it includes inverter (1), filter circuit (2), circuit of power factor correction (3), rectifier bridge (B1), electrochemical capacitor (C2), wherein, described circuit of power factor correction (3) is the parallel circuits that is made of reactor (L1) and electric capacity (C1), two ac input ends of rectifier bridge (B1) join with the output of the filter circuit (2) of external AC respectively, the one direct current output of this rectifier bridge (B1) and the input of circuit of power factor correction (3) join, the output of this circuit of power factor correction (3) joins with the positive pole of the electrochemical capacitor (C2) of the main power circuit of this convertible frequency air-conditioner and the input of inverter (1) respectively, simultaneously, another dc output end of rectifier bridge (B1) joins with the negative pole of electrochemical capacitor (C2) and the input of inverter (1) respectively, and the compressor (4) of the output of this inverter (1) and convertible frequency air-conditioner joins.
2. the main power circuit of a kind of convertible frequency air-conditioner according to claim 1, it is characterized in that: described electric capacity (C1) is electrodeless electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202678720U CN202737735U (en) | 2012-06-08 | 2012-06-08 | Main power source circuit of variable-frequency air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202678720U CN202737735U (en) | 2012-06-08 | 2012-06-08 | Main power source circuit of variable-frequency air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202737735U true CN202737735U (en) | 2013-02-13 |
Family
ID=47663394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202678720U Expired - Lifetime CN202737735U (en) | 2012-06-08 | 2012-06-08 | Main power source circuit of variable-frequency air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202737735U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915946A (en) * | 2019-03-21 | 2019-06-21 | 广东美的制冷设备有限公司 | Electric control gear, outdoor unit and air conditioner |
| WO2020147239A1 (en) * | 2019-01-16 | 2020-07-23 | 广东美的制冷设备有限公司 | Drive control circuit, air conditioner and controller |
-
2012
- 2012-06-08 CN CN2012202678720U patent/CN202737735U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020147239A1 (en) * | 2019-01-16 | 2020-07-23 | 广东美的制冷设备有限公司 | Drive control circuit, air conditioner and controller |
| CN109915946A (en) * | 2019-03-21 | 2019-06-21 | 广东美的制冷设备有限公司 | Electric control gear, outdoor unit and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |