CN201947169U - Stagger active PFC (power factor correction) circuit of inverter air conditioner - Google Patents

Abstract

The utility model relates to a stagger active PFC (power factor correction) circuit of an inverter air conditioner, which provides a novel full wave active PFC scheme. Two small PFC branch circuits connected in parallel work in a positive half-wave period and a negative half-wave period of alternating current respectively, thereby effectively reducing the volume and noise of reactors and simultaneously reducing capacities of direct electrolytic capacitors. The stagger active PFC circuit is provided with bridge rectifiers connected to two ends of an alternating current power supply in parallel and a pair of two-way power factor branch circuits. Current input end and output end of the two-way power factor branch circuits are overlaid, and a phase difference of the two-way factor branch circuits is 180 degrees. Two small PFC circuits are arranged at the position where a single bigger PFC circuit is disposed originally. The two small PFC circuits with halved power are connected in parallel, and the input end and the output end of the two small PFC circuits are overlaid, thereby reducing input current ripples and output current ripples caused by two inductive currents.

Description

Transducer air conditioning alternating expression active PFC circuit

Technical field

The utility model provides a kind of alternating expression active PFC circuit that is applied to transducer air conditioning, belongs to household appliance technical field.

Background technology

Because the use of low-carbon environment-friendly technology, the consumer constantly promotes for the cognition degree of high energy efficiency transducer air conditioning, and domestic frequency conversion transfers device to obtain popularizing fast.

Constitute the PFC factor correcting technology of transducer air conditioning drive plate, order glue mainly is divided into passive PFC, the active PFC of part and the active PFC type of skill of all-wave.

Passive PFC technology exists harmonic wave and passes through shortcomings such as difficult, that component size is bigger;

The installing space that the volume of the active PFC of part is still big, need are bigger;

The active PFC of all-wave to exist efficient on the low side, because of it does not start in alternating current positive half wave or negative half wave cycles.In addition, the noise of this type of PFC reactor is bigger, needs the electrochemical capacitor of configuration larger capacity.

In view of this special present patent application that proposes.

The utility model content

Transducer air conditioning alternating expression active PFC circuit described in the utility model, its purpose of design is to solve the problem of above-mentioned prior art existence and proposes the active PFC scheme of a kind of novel all-wave, proofread and correct positive half wave, the negative half wave cycles that branch road works in alternating current respectively with two low-power factors parallel with one another, be implemented under the high switching frequency operating state and reduce reactor volume and noise effectively, reduce the capacity of dc electrolysis electric capacity simultaneously.

For realizing above-mentioned purpose of design, described transducer air conditioning alternating expression active PFC circuit includes:

Be parallel with bridge type rectifier and one group of 2 tunnel power factor branch road at the AC power two ends.Wherein,

The current input terminal of 2 tunnel power factor branch roads and output mutual superposition,

The phase difference of 2 tunnel power factor branch roads is 180 °.

As above-mentioned basic scheme feature, change into low-power factor branch road 2 parallel connections, that input and power that output superposes reduce by half is set originally placing single more high-power factor correcting circuit place, 2 power factor branch roads work in the positive half wave of alternating current, negative half wave cycles respectively with 180 ° phase difference, thereby can reduce input current ripple and the output current ripple that is caused by two inductive currents.

Improvement project is further, in each road power factor branch road, is in series with a boost inductance and a power IGBT.

As above content, the advantage that transducer air conditioning alternating expression active PFC circuit described in the utility model has is:

1, realizes the active PFC technical scheme of a kind of novel all-wave, under high switching frequency operating state, can reduce reactor volume and noise.

2,, make drive plate integral body be dwindled to reach the purpose of design of miniaturization owing to reducing the electrochemical capacitor that the reactor noise need not to dispose larger capacity.

3, based on the characteristics of the active PFC technology of all-wave, realize high efficiency, use power can be promoted to 4kW can be applied to powerful variable frequency air-conditioner controller in the alternating current complete period.

Description of drawings

Now in conjunction with the accompanying drawings the utility model is described further

Fig. 1 is the principle schematic of described transducer air conditioning alternating expression active PFC circuit;

Fig. 2 is dissimilar PFC power comparison diagrams.

Embodiment

Embodiment 1, and as shown in Figure 1, the alternating expression active PFC circuit that is applied to transducer air conditioning includes,

Be parallel with bridge type rectifier and one group of 2 tunnel power factor branch road at the AC power two ends,

The current input terminal of 2 tunnel power factor branch roads and output mutual superposition, the phase difference of 2 tunnel power factor branch roads are 180 °.

Wherein, in one tunnel power factor branch road, be in series with a boost inductance L1 and a power IL1, in another road power factor branch road, be in series with a boost inductance L2 and a power IL2.

As shown in Figure 2, the existing required inductance energy EsL of the active PFC of single-stage is

$E_{\mathrm{SL}}=\frac{1}{2}{\mathrm{<figure-callout\; id="2"\; label="LI"\; filenames="DEST\_PATH\_HDA0000056138720000011.png"\; state="\{\{state\}\}">LI</figure-callout>}}^2$

The total inductance energy of the active PFC of alternating expression described in the utility model

For

$E_{I({\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="DEST\_PATH\_HDA0000056138720000011.png,DEST\_PATH\_HDA0000056138720000012.png"\; state="\{\{state\}\}">L</figure-callout>}}_1+L_2)}=\frac{1}{2}L{\left(\frac{I}{2}\right)}^2+\frac{1}{2}L{\left(\frac{I}{2}\right)}^2=\frac{1}{4}{\mathrm{<figure-callout\; id="2"\; label="LI"\; filenames="DEST\_PATH\_HDA0000056138720000011.png"\; state="\{\{state\}\}">LI</figure-callout>}}^2$

For identical power grade, if use identical inductance value in these two kinds of designs, the required total inductance energy of the active PFC of alternating expression has only half of single-stage so, promptly

$E_{\mathrm{SL}}=\frac{1}{2}{E}_{I({\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="DEST\_PATH\_HDA0000056138720000011.png,DEST\_PATH\_HDA0000056138720000012.png"\; state="\{\{state\}\}">L</figure-callout>}}_1+L_2)}$

Active PFC compares with existing single-stage, and the active PFC of alternating expression can reduce by 50% with the total inductance energy of design at most.

The inductance energy that the active PFC of alternating expression is reduced can make magnet volume reduce 32% at most.Compare with the active PFC structure of single-stage, the rms current of the high frequency output capacitance of the active PFC of alternating expression has reduced the rms current of large bulk capacitance less than the former 50%.The minimizing of the RMS electric current of high frequency boost capacitor can make boost capacitor quantity descend 25% at most.

The conduction loss P of the active PFC of single-stage _CSFor

P _CS＝I ²R

The overall conduction loss P of the active PFC of alternating expression _CIFor

$\mathrm{PCI}={\left(\frac{I}{2}\right)}^{2}R+{\left(\frac{I}{2}\right)}^{2}R$

Can draw from following formula

$P_{\mathrm{CI}}=\frac{1}{2}{P}_{\mathrm{CS}}$

Active PFC compares with single-stage, and the active PFC of alternating expression can make conduction loss reduce by 50% at most.

In the running of single-phase CCM formula pfc circuit underloading, heavy duty, power factor maintains about 0.95.

The alternating expression active PFC circuit under the situation of the branch road alternation of 180 ° of 2 phase differences, in the above scope of heavily loaded 700W, the interleaved PFC circuit can the holding power factor more than 0.98.

Claims (2)

1. transducer air conditioning alternating expression active PFC circuit, it is characterized in that: be parallel with bridge type rectifier and one group of 2 tunnel power factor branch road at the AC power two ends, the current input terminal of 2 tunnel power factor branch roads and output mutual superposition, the phase difference of 2 tunnel power factor branch roads are 180 °.

2. transducer air conditioning alternating expression active PFC circuit according to claim 1 is characterized in that: in each road power factor branch road, be in series with a boost inductance and a power IGBT.

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