In order to adapt to energy conservation and emission reduction of home appliances market development needs in recent years,the washing machine manufacturers continuously designed three different consumption goods level-low, median, and high, to meet different customer groups. In order to improve the design efficiency of vertical inverter washer, to overcome the customization and integrated circuits requirements of different drive mode vertical inverter motor on the current detector circuit, in this paper, the standardization design of a current detection circuit performed in design development of the vertical inverter washer is described.

In Southeast Asia and other countries, because of the terrible infrastructure, electricity consumption of every family is limited. When some household appliances work at the same time, the breaker trips, especially for air conditioner, which maybe causes the damage of household appliances. So an intelligent air conditioning control method is proposed to solve the problem. The intelligent control module and control algorithm were designed for different type breakers. A experimental platform was used in estimation of the control method. The results shows that the intelligent air conditioning control method can control the operating power of the air conditioner to prevent tripping.

pulsating high frequency signal injection based on PMSM compressor. The effectiveness of the proposed method has been verified by experimental results.

Through the analysis of the refrigerator performance and the technical parameters of the existing compressor under the new national standard, from the point of view of the compressor, variable frequency compressor with the wider speed is designed and the performance verification of the refrigerator is completed. The results show that the most efficient point is 1500~1800RPM for the wider speed compressor, which can better meet the requirements of the new GB Standard requirements for energy efficiency test, with the first level energy efficiency index. under the condition that the maximum COP of the original compressor is 2% lower, the performance of the refrigerator can still achieve the requirements of the new GB with the first level energy efficiency index. At the same time, the air-cooled refrigerator using the new compressor with lower cost can improve interiorly the market competitiveness.

The paper mainly introduces the unique control algorithm of inverter compressor (Abbreviation: RAMDA). It includes two parts, power factor adjustment and compressor driving method. A-PAM method is introduced in the Power factor adjustment part. Compressor driving method mainly includes of two kinds of torque control, over modulation, Weak field control and Beatless.

In this paper, the principle of minimum copper loss control for permanent magnet synchronous motor and its application method in inverter air conditioner are introduced. The theoretical calculation formula for applying the minimum copper loss control method to the inverter air conditioner system is given and solved by engineering practice. The influence of the actual parameter error of the motor. In practical applications, by adjusting the copper loss minimum control gain, the input power is adjusted to a minimum, which improves the energy efficiency of the inverter air conditioner.

Based on the H-bridge control technology, a large power drive circuit for DC motor is designed. The circuit has a dead time control and overcurrent protection function. System logic by single-chip computer, photoelectric isolating circuit, logic control circuit, discrete component H bridge driving circuit, current sampling circuit, filter detection circuit, linear amplification of isolating circuit and so on seven parts. This paper mainly introduced through the logic circuit and temporal sequence of clever control, curb the phenomenon of H bridge driver direct and without and the control circuit of dead area, can be in the positive and negative to the reliable running of motor. The system is characterized by simple structure, strong reliability and better output power than IC drive.

In recent years, multi-split air-conditioning market and low-temperature heating market has been developing rapidly. The large size rotor compressor has obvious competitive advantage than the scroll compressor, and its proportion is bigger and bigger. The market prospect is broad, which is sought after by most manufacturers. This article mainly introduces the key technology points for developing such a competitive product. First of all, the design of high reliability shafting structure makes the compressor run smoothly, the load of the rotating shaft is low and the clearance of the rotor is even more uniform; secondly, lubrication oil dynamic balance should be satisfied under the condition of long pipe installation; moreover, effectively reduce the noise and reliable valve system structure design are also essential means.

This article introduced the control principles and methods of PFC in inverter air-conditiners' designing. By detection the average power current, the instantaneous power current, and the dc bus voltage output, it automatically calculate and control the duty ratio of PWM wave, automatically djust the power supply power factor, realize the dc bus voltage booster and stable. Control model is simple and control is convenient, without too much hardware circuit. Achieve the goal of the ideal power factor automatic adjustment.

According to the safety requirements of household appliances, fault protection tests applied to the protective electronic circuits system were classified. Based on different protection abilities and fault test requirements of protective electronic circuits system, classification advice was given. The requirements of protective electronic circuit design were put forward, and the realization schemes of different protective electronic circuit system are illustrated through examples.

Based on design requirements for the air volume increase and noise reduction of air-conditioning outdoor unit, this paper studies the influence factors of the mesh enclosure density, wind wheel position and air-guided ring length on air volume and noise of outdoor unit. The result shows that, the air volume increases with the increasing of the mesh enclosure density, the noise change will decrease 0.5dB under the same air volume. Which illustrate that increasing the mesh enclosure density is conductive to improve the air volume and reducing noise. As the wind wheel moves forward, the air volume outdoor increases about 20~30m³/s, while the noise will decrease 0.5dB under the same air volume. Which illustrate that moving forward the wind wheel is conductive to improve the air volume and reduce noise. The air volume outdoor increases 80~100m³/s with the increasing of the air-guided ring length, while the noise can be decreased by 1.0dB under the same air volume. Which illustrate that increasing the air-guided ring length is conducive to improve the air volume and reduce noise. However, the mesh enclosure density increase and the wind wheel forward both are limited by design specifications, while the length increases of the air-guided ring length is limited by the metal material and processing technology.

The lighting lamp used in the old refrigerator design is an incandescent lamp, in recent years, the refrigerator lighting lamp needs to seek a new energy saving lamp with the strong advocacy of the state on the application of energy saving. In this article, the design and analysis of the energy-saving LED lighting lamp on the refrigerator is done. By comparing series circuit and parallel circuit of the LED lamp driving circuit, the best driving circuit is selected.

Lokring Ring is a very efficient and reliable connection technology of the pipes, which has completely replaced the traditional argon arc welding and resistance welding technology in the refrigeration industry. This paper used the CAE simulation technology to simulate the copper pipes connecting process by Lokring Ring, analysed the influences of the different wall thickness of the copper tubes on the bonding strength under the static pressure condition of 18.6MPa and 6.3MPa. The results show that copper will not crack with above two conditions, but there was a leak risk with the wall thickness of pipe 0.6 and 0.7mm connecting by Lokring Ring, suggested to choose the copper pipe more than 0.7mm thickness.

Due to the gradual requirements of the refrigeration temperature, low temperature and the concept of ultra-low temperature, the refrigeration system is also further improved and delicated, which also generated the contents of this article-cascade refrigeration, as the name suggests, superposition of two sets of refrigeration system, composed of a new enhanced system to achieve the lower refrigeration temperature requirements.

An introduction to IEC 60335-1:2010+A1:2013(Ed 5.1)+A2:2016(Ed 5.2) as compared to the previous edition(Ed 4.1) of the standard is mainly about its corrigendum and amendment, including class III appliance and class III structure, functional earthing, power input and current, maximum normal temperature rises, leakage current at operating temperature, insulation of the supply cords.

The traditional cushion material often rupture and excessive compression hardening due to repeated drop in transport, this leads to failure of cushioning properties and product damage. EPO cushioning material has better toughness, shear resistance than traditional material, and it has good compression resistance and material strength, which can effectively solve those problems. Through the analysis of material performance, simulation verification and practical application of washing products, the EPO cushioning material has been proved to have good transportation protection performance in this paper.

By analyzing the relationship between the discharge capacity of the capacitor, the discharge of the capacitor and the threshold of perception and the threshold of pain, understand the 22.5 of GB 4706.1-2005 "there is no risk of electric shock from charged capacitors having a rated capacitance exceeding 0.1μF ", and analyzing the cause of one second after disconnection, the plug voltage value should not exceed 34V. In addition to the standard requirements, to carry out voltage of plug measurement methods to discuss, help the laboratory testing engineers to understand the standard, master the correct detection method.

The constant temperature performance of gas water heater is the focus of the user's attention, gas water heater manufacturers put forward a variety of solutions around the research of constant temperature. But can’t fundamentally solve the problem of long waiting time for hot water, and the problem that the outlet water temperature is sometimes cold and sometimes very hot, can’t solve the problem of the second time you turn on the faucet and will not flow out of cold water. In view of the above problems, this paper proposes a research method to change the design of pipelines and software control of gas water heaters. Firstly, the method adds a water server to the main line and the bypass line of the heat exchanger that automatically adjusts the water according to the required heat during the combustion process. Secondly, the mixture ratio of cold and hot water is accurately adjusted by software. Finally, software control scheme is designed reasonably to control the air-fuel ratio of the combustion process within the setting range. By the above methods, the temperature stability time of the effluent is not more than 8s when the gas water heater is opened, achieve the effect of the hot water temperature changing in±1℃.

At present, the direct cooling freezer comprise most of the domestic household refrigerator market, its special storage environment leads to bacterial fast growth and odor phenomenon serious. The text will focus on the problem during refrigerator use procedure, combined with the refrigerator actual operating environment, adopt targeted techniques or methods, discuss the possibility of eliminate bacteria and odor.

Based on the structure characteristics and working principle of the dust collecting system of IFD and air cleaner, it is expounded that the collection of dust by IFD has some advantages over traditional ESP electrostatic precipitator. At the same time, several common factors that affect the CADR of air cleaner, including circulating air volume, electric field intensity and installation location, are put forward, which are equipped with IFD device. The effect of these factors on the performance of air cleaner is analyzed. Finally, the rationalization suggestions on product design are summarized.