Application of Sine Wave DC Inverter Technology in Air Conditioner. Headquarter of Haier Air Conditioner Co., Ltd

Transcription

1 Application of Sine Wave DC Inverter Technology in Air Conditioner Headquarter of Haier Air Conditioner Co., Ltd 1

2 Content Key energy-saving technology of air conditioner Comparison of 10 square wave and 180 sine wave in control part Technical feature of Haier 180 sine wave Test results

3 Energy consumption of air con 89% of the energy is consumed by compressor. compressor 89% outdoor fan 5% indoor part 5% Others 1% Rating running Power input [W] compressor 76% outdoor fan 11% indoor part 10% Others 3% compressor Lowing loading running Power input [W] motor Energy saving of compressor is the key issue for the energy saving of aircon 3

4 The key technology of energy-saving air conditioner 1 Temp control wave for DC inverter and on/off machines ON/OFF Type It needs more time to reach the setting temperature Inverter Type Increasing speed of compressor so as to reach the setting temperature in a shorter time. Feature of inverter To decrease speed of compressor to maintain a certain temperature Providing a comfortable room space DC machines can adjust the room temp at very small range, so it can assure the small temp changing. Energy-saving DC 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. 4

5 Comparison of 10 square wave and 180 sine wave in control part (1) Coil have some period with no current, Torque is disturbed largely, has large electromagnetism noise Harmonic wave part is large Compressor has low efficiency 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 5

6 Comparison of 10 square wave and 180 sine wave in control part () Efficiency comparability of 10 square wave and 180 sine wave Motor run speed Efficiency improvement of sine wave 30Hz Hz +.3 6

7 Detection method for Current DC motor S up S vp S wp Power supply V DC S up S un S vp S vn S wp S wn PM power supply S un S vn S wn PM I u I w I DC (a) CT method I u (b) 3-shunt method I v I w power supply S up S un S vp S vn S wp S wn PM R DC I DC (c) 1-shunt method 7

8 Feature 1; High Reliability (6)Special Start Sequence Starting Feature ; High-efficiency control (for Saving Energy) (1) Demagnetizing Protection Double Over Current Protection (5)Torque Control (for reducing compressor vibration) ()High Efficiency PFC (4) Maximum Torque/Current Ratio Control Motor Current Minimum I d = k E E ( Ld Lq ) 4( L L ) d k Cooing q + I q Motor Voltage (3)Weakening magnet Control ( Improve the efficiency running range) I d k = L E d 1 + L d Heating V 0m 1 ω - ( L I ) q q Motor Speed 8

9 (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 life or 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. 9

10 () High Efficiency PFC Advantage: reducing Harmonic wave of the current, increasing power factor 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 off: Current sudden change is serious, di/dt is large, so there is a lot of harmonic wave, high order harmonic wave is serious. 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. 10

11 (3) Weakening magnet Control Advantage: do weak magnet control when the voltage reaches saturation, can expend running speed range of compressor,d Id D:, I d k = L V 0m E d = V 1 + L am d r I am V 0m 1 ω V am,i: - ( L I ) q q Iq Vmax + - V instruction Formula of Min Current Id1 + + Id instruction 11

12 (4) Maximum Torque/Current Ratio Control Advantage: Control Maximum torque/current in steady condition. 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: I d = k E k E ( L ) 4( ) d Lq L L d q + I q Min Im I Ť Id Relationship of exciting current Id and motor current Im 1

13 (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: 13

14 (6)Special Start Sequence Advantage: special compressor start technology, can reduce the possibility of failure compressor start Point 14

15 (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. 15

16 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 005, Haier began to adopt 180 sine wave technology to DC inverter machines. Now in 008, 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.. Haier has full series of DC inverter machines. From split type, cabinet type, split 1 by, split 1 by 3, cabinet and split mixed 1 by. 16

17 Test results Start waves 17

18 TEST RESULT 30Hz 18

19 TEST RESULT 40Hz 19

20 TEST RESULT 60Hz 0

21 TEST RESULT 70Hz 1

22 TEST RESULT 90Hz

23 TEST RESULT 100Hz 3

24 Thank You! 4