CN202334283U - Variable frequency harmonic current suppression circuit - Google Patents
Variable frequency harmonic current suppression circuit Download PDFInfo
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- CN202334283U CN202334283U CN2011205249065U CN201120524906U CN202334283U CN 202334283 U CN202334283 U CN 202334283U CN 2011205249065 U CN2011205249065 U CN 2011205249065U CN 201120524906 U CN201120524906 U CN 201120524906U CN 202334283 U CN202334283 U CN 202334283U
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- 230000001629 suppression Effects 0.000 title abstract 2
- 238000004804 winding Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model provides a variable frequency harmonic current suppression circuit, which is formed by connection of a parallel resonant circuit, a bridge rectifier BR, a passive power factor correction circuit and an electrolytic capacitor C4. The parallel resonant circuit consists of an inductor L4, a third harmonic secondary winding circuit and a fifth harmonic secondary winding circuit. The interference of third and fifth harmonic current to the circuit can be inhibited so that the circuit can be prevented from being damaged, a variable frequency air conditioner can be protected, and the reliability and the quality of a product can be improved. Meanwhile, the interference of the third and fifth harmonic current produced by the variable frequency air conditioner cannot extend into a power grid to affect other household electrical appliances or devices, and thus other household electrical appliances and devices can be protected.
Description
Technical field
The utility model belongs to the air conditioner technical field, relates in particular to a kind of frequency-conversion harmonic current suppressing circuit of air conditioner.
Background technology
Convertible frequency air-conditioner is because its temperature fluctuation range is little; Comfortableness is good, and the rush of current to electrical network during startup is little, is well suited for the zone lower in some voltage ratios, that scope range of the fluctuation of voltage is bigger and uses; Characteristics such as its noise is low, vibration is little, the life-span is long are slowly liked and favor by people.
Because convertible frequency air-conditioner itself, it will adopt stepless speed regulation, so must come its rotating speed of controlling of sampling with frequency-variable module, makes its rotating speed can be high, can be low, so it is different from and decides frequency, and fixed its rotating speed of frequency has only one grade.Convertible frequency air-conditioner all is to adopt AC-DC to become the mapping mode of interchange again; When becoming direct current by the interchange input rectifying; (power factor correction Power Factor Correction is called for short: PFC) circuit control, the power factor (PF) of electrical network is very low so if the centre does not have PFC.Present power factor correction technology comprises: two kinds of active PFC and passive PFC; Because active PFC cost is big, control is complicated, failure rate is high, the maintenance trouble; So it is general only in the use of the country of some high requests; And passive PFC cost is low, control characteristics such as simple, that failure rate is little, maintenance is easy, and passive PFC technology often is accustomed to using by people.
Because compressor is a very big inductive load; When electrical network does work to it; It also can produce a large amount of reactive powers, so just can produce a large amount of harmonic currents inevitably pollutes electrical network for it, can make the effective rate of utilization of electrical network low like this; Harmonic current also can influence the normal use of other household electrical appliance or miscellaneous equipment in addition, such as: heart heartstart, hearing aids etc.
The utility model content
For addressing the above problem, the purpose of the utility model is to provide a kind of frequency-conversion harmonic current suppressing circuit that can suppress energy bigger three times and the air conditioner of quintuple harmonics electric current.
For realizing that above-mentioned purpose adopts following technical scheme: a kind of frequency-conversion harmonic current suppressing circuit; Connected to form by shunt-resonant circuit, rectifier bridge BR, passive power factor correcting circuit, electrochemical capacitor C4, said shunt-resonant circuit is made up of inductor L4 and triple-frequency harmonics secondary winding loop thereof, quintuple harmonics secondary winding loop.
Said triple-frequency harmonics secondary winding loop comprises inductance L 2 and capacitor C 2, and said triple-frequency harmonics secondary winding loop resonance is on the frequency of 150Hz.
Said quintuple harmonics secondary winding loop comprises inductance L 3 and capacitor C 3, and said quintuple harmonics secondary winding loop resonance is on the frequency of 250Hz.
Said passive power factor correcting circuit is made up of inductance L 1, polarity free capacitor C1, isolating diode D1.
The beneficial effect of the utility model is:
1) suppresses three times, quintuple harmonics electric current interference, make circuit avoid its infringement, protected transducer air conditioning, promoted reliability of products and product quality circuit.
2) three interference with the quintuple harmonics electric current that convertible frequency air-conditioner produced also can not seal in electrical network and influence other household electrical appliance and equipment, have protected other household electrical appliance and equipment, reduce failure rate, reduce maintenance cost.
Description of drawings
Fig. 1 is a harmonic current impulse waveform sketch map;
Fig. 2 is a high order harmonic component waveform stack sketch map;
Fig. 3 is the utility model frequency-conversion harmonic current suppressing circuit figure.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that practical implementation described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 1, Fig. 2, the generation reason of harmonic current be input voltage and input current homophase is not caused because the not homophase of input current; So input current is the hard pulse waveform, V representes input voltage, and the I dash area is represented input current; As can beappreciated from fig. 1: should be that sinusoidal wave input current is because there are phase difference in voltage and electric current; So input current is the hard pulse waveform, this periodic non-sinusoidal current waveform (similar square wave), its inner packet contains a large amount of radio-frequency components; The frequency that certain energy is arranged is 50Hz twice, three times, four times, five times ... N high order harmonic component composition doubly; Be the current waveform of the non-sinusoidal waveform of this 50Hz, comprised 100Hz (second harmonic), 150Hz (triple-frequency harmonics), 200Hz (four-time harmonic), 250Hz (quintuple harmonics) ..., until to the sinusoidal wave electric current composition of the high-frequency of several million Hz; Just the current waveform of the non-sinusoidal waveform of this 50Hz is the stack of the sinusoidal current waveform of numerous 50Hz integral multiples; As shown in Figure 2, and in the sinusoidal current waveform of numerous 50Hz integral multiples, its three times are maximum with the quintuple harmonics contained energy; So its influence is maximum with interference; Therefore the frequency-conversion harmonic current suppressing circuit of the utility model is exactly will comprise wherein three times to it to suppress with quintuple harmonics, makes it can not be input to late-class circuit, influences the use of convertible frequency air-conditioner.
See also Fig. 3, the frequency-conversion harmonic current suppressing circuit of the utility model is to be added on the input live wire, makes to be able to suppress and do not passed through with the quintuple harmonics electric current wherein for three times.L4 is an inductor that has secondary winding; Its secondary winding inductance L2 and capacitor C 2, inductance L 3 are formed antiresonant circuit respectively with capacitor C 3, make inductance L 2 and capacitor C 2 composition shunt-resonant circuit resonance on the frequency of 150Hz (triple-frequency harmonics), and inductance L 3 and capacitor C 3 composition shunt-resonant circuit resonance are on the frequency of 250Hz (quintuple harmonics); Principle according to parallel resonance can be known: the pure resistive impedance of parallel resonance is maximum; So it is maximum in the impedance of triple-frequency harmonics and quintuple harmonics to resonance, and L4 is an inductor that has secondary winding, after the coupling of the magnetic between inductance; Primary inductance L4 produces very high impedance to 150Hz (triple-frequency harmonics) and 250Hz (quintuple harmonics) respectively; Thereby suppressed the input and the output of triple-frequency harmonics and quintuple harmonics, and L4 is less because of the number of turn, very little to the impedance of other resonance point of disresonance frequence; Electric current to other frequency does not almost have the loss of voltage, thereby has suppressed three times and quintuple harmonics of input current targetedly.
BR is a rectifier bridge, and it is rectified into the sine wave of input the half-wave of pulsation; L1, C1, D1 form passive pfc circuit, and it can be brought up to the power factor (PF) of circuit about 0.93, and C4 is an electrochemical capacitor; It is the load raising electric energy of back; It also has the effect of filtering smooth dc voltage in addition, makes dc voltage stability about 310V, makes other circuit ability operate as normal.
Claims (4)
1. frequency-conversion harmonic current suppressing circuit; It is characterized in that: connected to form by shunt-resonant circuit, rectifier bridge (BR), passive power factor correcting circuit, electrochemical capacitor (C4), said shunt-resonant circuit is made up of inductor (L4) and triple-frequency harmonics secondary winding loop thereof, quintuple harmonics secondary winding loop.
2. frequency-conversion harmonic current suppressing circuit according to claim 1 is characterized in that: said triple-frequency harmonics secondary winding loop comprises inductance (L2) and electric capacity (C2), and said triple-frequency harmonics secondary winding loop resonance is on the frequency of 150Hz.
3. frequency-conversion harmonic current suppressing circuit according to claim 2 is characterized in that: said quintuple harmonics secondary winding loop comprises inductance (L3) and electric capacity (C3), and said quintuple harmonics secondary winding loop resonance is on the frequency of 250Hz.
4. frequency-conversion harmonic current suppressing circuit according to claim 3 is characterized in that: said passive power factor correcting circuit is made up of inductance (L1), polarity free capacitor (C1), isolating diode (D1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205249065U CN202334283U (en) | 2011-12-14 | 2011-12-14 | Variable frequency harmonic current suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205249065U CN202334283U (en) | 2011-12-14 | 2011-12-14 | Variable frequency harmonic current suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202334283U true CN202334283U (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205249065U Expired - Fee Related CN202334283U (en) | 2011-12-14 | 2011-12-14 | Variable frequency harmonic current suppression circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202334283U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638947A (en) * | 2013-11-14 | 2015-05-20 | 东林科技股份有限公司 | Isolation type alternating current and direct current conversion device and conversion method thereof |
| CN105226923A (en) * | 2015-09-07 | 2016-01-06 | 北京英博电气股份有限公司 | A kind of high frequency filter being applied to combining inverter |
-
2011
- 2011-12-14 CN CN2011205249065U patent/CN202334283U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638947A (en) * | 2013-11-14 | 2015-05-20 | 东林科技股份有限公司 | Isolation type alternating current and direct current conversion device and conversion method thereof |
| WO2015070514A1 (en) * | 2013-11-14 | 2015-05-21 | 东林科技股份有限公司 | Isolated ac-dc conversion device and conversion method thereof |
| JP2016537947A (en) * | 2013-11-14 | 2016-12-01 | 東林科技股▲分▼有限公司Ｈｅｐ Ｔｅｃｈ Ｃｏ．， Ｌｔｄ | Separation type AC / DC converter and conversion method thereof |
| CN105226923A (en) * | 2015-09-07 | 2016-01-06 | 北京英博电气股份有限公司 | A kind of high frequency filter being applied to combining inverter |
| CN105226923B (en) * | 2015-09-07 | 2018-05-08 | 北京英博电气股份有限公司 | A kind of high frequency filter applied to gird-connected inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20121214 |