Advantage of Haier DC Inverter 180 Sine Wave

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HeadquarterHeadquarter of Haier Air Conditioner Co., LtdHaier Air Conditioner Co., Ltd

AApplication of Sine Wave DC Inverterpplication of Sine Wave DC Inverter

Technology in Air ConditionTechnology in Air Condition erer

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• Key energy-saving technology of air conditioner

• Comparison of 120°square wave and 180°sine wave in control part

• Technical feature of Haier 180 °sine wave

• Test results

ContentContent

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0 100 200 300 400 500

0 100 200 300 400 500

89% of the energy is consumed by compressor.

Power input [W]

compressor 89%

Power input [W]

Lowing loading running

Rating running

outdoor fan 5% indoor part 5% Others 1%

compressor 76%outdoor fan 11%

indoor part 10% Others 3%

Energy saving of compressor is the key issue for the energy saving of airconEnergy saving of compressor is the key issue for the energy saving of aircon

compressor

motor

Energy consumption of air con Energy consumption of air con

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Increasing speed of compressor so as to reachthe setting temperaturein a shorter time.

It needs more time to reach the setting temperature

To decrease speed of compressorto maintain a certain temperature

� Providing a comfortable room spaceDC machines can adjust the room temp at very small range, so it can assure the small temp changing. � Energy-savingDC machines can adjust the compressor running speed, when just starting, running at high speed, fast cooling, when nearly to setting temp, reducing running speed, so that reducing compressor power, so it can save energy.

Temp control wave for DC inverter and on/off machines

Feature of inverter

The key technology of energyThe key technology of energy--saving air conditioner saving air conditioner ��11��

ON/OFF Type

Inverter Type

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Comparison of 120°square wave and 180°sine wave in control part

(1)

●All period have current, with high efficiency,●Torque is smooth, electromagnetism noise is small●Harmonic wave is small●Compressor has high efficiency, expecially in mid-high speed

●Coil have some period with no current, ●Torque is disturbed largely, has large electromagnetism noise●Harmonic wave part is large●Compressor has low efficiency

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Efficiency comparability of 120°square wave and 180 °sine wave

Motor run speed Efficiency improvement of sine wave

30Hz +0.9�

50Hz +2.3�

Comparison of 120°square wave and 180°sine wave in control part

(2)

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VDCPM

Sup

Sun

Svp

Svn

Swp

Swn

Powersupply

IwIu IDC

PM

Sup

Sun

Svp

Svn

Swp

Swn

IwIvIu

(b) 3-shunt method

power supply

RDC

PM

Sup

Sun

Svp

Svn

Swp

Swn

IDC

(c) 1-shunt method

power supply

Detection method for Current DC motor

(a) CT method

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Feature 1; High ReliabilityFeature 2; High-efficiency control (for Saving Energy)

Motor Speed

Motor Voltage

CooingStarting

(1)Demagnetizing Protection �Double Over Current Protection�

(2)High Efficiency PFC

(3)Weakening magnet Control( Improve the efficiency running

range)

(5)Torque Control(for reducing

compressorvibration)

(4) Maximum Torque/Current Ratio Control�Motor Current Minimum�

(6)SpecialStart

Sequence Heating

( ) ( )2

q2

2EE I

42+

−−

−−=

qdqdd

LL

k

LL

kI

( )2q21

20mE L-

1q

ddd I

V

LL

kI

ω+−=

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(1)Current protection of compressor demagnetization

� Advantage: Double current protection, can efficiently protect compressor not to be demagnetized, extending compressor life

� The rotor of DC compressor is permanent magnet, if the compressor current exceed one point, even if the short current strike can cause demagnetization, decreasing the compressor lifeor breaking compressor.

� Normal overcurrent protection for DC aircon only protects the virtual value of current, could not check the peak value of the current and protect it, so could not avoid the demagnetization efficiently.

� Haier 180°sine wave DC inverter have not only the n ormal compressor overcurrent protection, but also have special demagnetization protecting circuit, can check the compressor peak value current quickly, and protect compressor before reaching demagnetizing current, so that can avoid compressor demagnetizing efficiently.

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(2) High Efficiency PFC

� new-active PFC. Value of current can decide the on and off of the PFC, can reducing power consumption efficiently at same time, reducing EMI.

Current wave when PFC is on:Current sudden change is small, di/dt is small, so the current harmonic wave is small and high order harmonic wave is weak.

Current wave when PFC is off:Current sudden change is serious, di/dt is large, so there is a lot of harmonic wave, high order harmonic wave is serious.

Advantage: reducing Harmonic wave of the current, increasing power factor

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(3) Weakening magnet Control

Vmax

V instruction

+

-+

+

Formula of Min Current

Iq

∆Id1

Id instruction

�

�

���

:���������amam0m IrVV ⋅−=

amIV ,am

( )2q21

20mE L-

1q

ddd I

V

LL

kI

ω+−=

Advantage: do weak magnet control when the voltage re aches saturation, can expend running speed range of compress or

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(4) Maximum Torque/Current Ratio ControlAdvantage: Control Maximum torque/current in steady co ndition.

When in same torque, current is Min, so it can reducing power and improving efficiency

� When in certain moment and speed, the relationship of motor current lm and exciting current ld is as following chart. When Im is in min, the relationship of Id and Iq is in following:

( ) ( )2

q2

2EE I

42+

−−

−−=

qdqdd

LL

k

LL

kI

Id

I‚ Ť

Min Im

Relationship of exciting current Idand motor current Im

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(5)Low Frequency Torque Control

� Advantage: reducing vibration of single rotary inverter compressor at low frequency, increasing the range of running frequency.

� ����������������������������������������.������,������������������,����������,������.���������������,��������,������������������������,��������������.Low frequency Moment control wave of single rotary compressor:

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(6)Special Start Sequence

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180

0

12060

-60-120

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Advantage: special compressor start technology, can reduce the possibility of failure compressor start.

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(7)High reliability of IPM Module

� Advantage: adding temp protecting function, can protect IPM not to be broken due to overheating .

� Haier IPM of DC inverter adopts the fourth smart IPM from Mitsubishi. Besides of short circuit protecting, under-voltage protecting for normal IPM, Haier IPM adds inside temp protecting. When the inside temp of IPM is on abnormity, units will be protected and stopped. Solved the phenomenon when reactor and IPM is connected not so well, temp of reactor is not high, but IPM temp is so high, so that the IPM will be broken.

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Development of Haier DC inverter

� 1. In 1993, Haier made the first set of inverter aircon in China. In1998, Haier made the first DC inverter aircon in China. From 2005, Haier began to adopt 180 sine wave technology to DC inverter machines.Now in 2008, Haier has adopted this 180 sine wave technology to all DC inverter machines. In these 15 years development and update, technology of Haier DC inverter is nearly maturity and perfect. Haier Invests world-class air conditioner specialists and spends 5 years to develop this special technology, now Haier DC inverter machines are sold to all of Europe, it belongs to the advanced project of International DC inverter technology, has reached Japanese top-ranking DC inverter level.

� 2. Haier has full series of DC inverter machines. From split type, cabinet type, split 1 by 2, split 1 by 3, cabinet and split mixed 1 by 2.

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Test resultsTest results

� Start waves

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TEST RESULTTEST RESULT 330Hz0Hz

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TEST RESULTTEST RESULT 4400HzHz

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TEST RESULTTEST RESULT 660Hz0Hz

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TEST RESULTTEST RESULT 770Hz0Hz

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TEST RESULTTEST RESULT 990Hz0Hz

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TEST RESULTTEST RESULT 100Hz100Hz

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Thank You!