CN2504823Y

CN2504823Y - Device for eliminating power source voltage fluctuation and scintillation caused by starting dynamo

Info

Publication number: CN2504823Y
Application number: CN 01254441
Authority: CN
Inventors: 吕布云
Original assignee: Shanghai Hitachi Household Appliance Co Ltd
Current assignee: Shanghai Hitachi Household Appliance Co Ltd
Priority date: 2001-10-31
Filing date: 2001-10-31
Publication date: 2002-08-07
Anticipated expiration: 2011-10-31

Abstract

The utility model relates to a device which can eliminate instant wave and flash of source of voltage caused by motor starting, comprising a compressor power loop which is characterized in that a circuit which can reduce the starting current of the motor and enhance the starting torque of the motor is series connected with the compressor power loop. The circuit comprises a power resistance R1 which is series connected with an L end of the power supply of the compressor, a non-polar capacitance C2 parallel connected with two ends of a non-polar capacitance C, and a relay RL with a time counter. A contact point of the relay RL is series connected between the non-polar capacitance C2 and the non-polar capacitance C. Therefore, the utility model utilizes the power resistance series connected with the motor loop to reduce the motor starting current and utilizes the parallel connected non-polar capacitance C2 to enhance the motor starting torque, which overcomes the problem of too great reduction of source voltage in the moment of starting a closed compressor, thus meeting the export needs of the household appliances. The utility model is very practical.

Description

Eliminate the device of instantaneous mains fluctuations that cause of electric motor starting and flicker

Technical field

The utility model relates to a kind of when the thermostatic equipments such as air conditioner that are applied to adopt closed compressor of air conditioner to make start, and the inner high-power parts of thermostatic equipment (as compressor electric motor) start the instantaneous mains fluctuations that cause and the instantaneous mains fluctuations that cause of elimination electric motor starting of flicker and the device of flicker.

Background technology

At present, in equipment such as air conditioner and refrigerator, usually adopt closed compressor of air conditioner to constitute thermostatic equipment, this thermostatic equipment (especially at night) when the startup operation usually allows the people feel to have recovered original brightness again at once after the instantaneous dimness of home lighting equipment once, and its reason is to stablize because of the instantaneous supply voltage that can influence that starts than heavy-duty motor.See also shown in Figure 1, this is the electrical circuit of compressor in prior art air conditioner or the refrigerator, as can be known from Fig. 1, owing to do not take to reduce the setting that starts power consumption in the electrical circuit of compressor, therefore when air conditioner or refrigerator startup, its inside start the instantaneous supply voltage momentary fluctuation that causes than heavy-duty motor, its undulate quantity is often greater than 4% of rated voltage, if undulate quantity is big then can influence the environment that other household electrical appliance use.On this project, the household electrical appliance of overseas market, especially and the European market starts to heavy-duty motor that to cause the requirement of supply voltage momentary fluctuation be serious, when requiring rated current to be not more than the big power consumption appliance starting of device interior of 16A stable the impacting of supply voltage is lower than 4% of rated voltage, just get permission on market, to sell, therefore, the product of domestic air conditioner or refrigerator enterprise must reach this requirement, just can be exported to the international market.

Yet, the parts of power consumption maximum are compressor electric motors in thermostatic equipment, this motor is to be completely enclosed within the compressor housing, and the compressor space is limited, and hermetic compressor is the air supply rate of a maturation, the device that can't add reduction startup power consumption in limited space causes the problem of supply voltage momentary fluctuation to bring difficulty because of the heavy-duty motor startup therefore for improvement to improve the starting characteristic of motor.

Summary of the invention:

The purpose of this utility model is to provide the device of instantaneous mains fluctuations that cause of a kind of improved elimination electric motor starting and flicker, it can not change original compressor structure, and starts the instantaneous stable problem of supply voltage that influences with minimum cost solution than heavy-duty motor.

The purpose of this utility model is achieved in that

A kind of device of eliminating instantaneous mains fluctuations that cause of electric motor starting and flicker, comprise the compressor power loop, be characterized in: serial connection one reduces the circuit of electric motor starting electric current and raising electric motor starting moment on described compressor power loop, it comprises: a power resistor R1, this power resistor R1 are serially connected in compressor one power supply L end; One polarity free capacitor C2, this polarity free capacitor C2 is attempted by the two ends of polarity free capacitor C; One contains the relay R L of time counter.

In the device of instantaneous mains fluctuations that cause of above-mentioned elimination electric motor starting and flicker, wherein, the contact of described relay R L is serially connected between two polarity free capacitor C2 and the C.

The utility model is eliminated the device of instantaneous mains fluctuations that cause of electric motor starting and flicker owing to adopted above-mentioned technical scheme, makes it compared with prior art, has following advantage and good effect:

1. the utility model can reduce the electric motor starting electric current thus owing to be connected in series a power resistor R1 at the power of compressor end, reduces to start power consumption;

2. the utility model be owing at the two ends of polarity free capacitor C and meet a polarity free capacitor C2, therefore can increase electric motor starting moment, shortens electrical power moment to carry out the transition to dynamic time by static state;

3. the utility model is owing to contain the relay R L of time counter in employing, thus when in the stipulated time after motor runs well, control relay RL contact is with the power resistor R1 short circuit of series connection, and with the polarity free capacitor C2 open circuit that is added, the compressor electric motor loop is returned to normal, thereby can keep compressor electric motor under the electrical parameter of its design, to move.

4. the utility model is because simple in structure, and a large amount of closed compressors of air conditioner that adopt at present be need not to do any change, meets a certain compressor types electric motor starting characteristic as long as the parameter of this device device aligned, and is easy to utilize.

Description of drawings

Embodiment by the following device of the utility model being eliminated instantaneous mains fluctuations that cause of electric motor starting and flicker can further understand the purpose of this utility model, specific structural features and advantage in conjunction with the description of its accompanying drawing.Wherein, accompanying drawing is:

Fig. 1 is a prior art compressor electrical circuit electrical schematic diagram;

Fig. 2 is the electrical schematic diagram according to the device of instantaneous mains fluctuations that cause of elimination electric motor starting that the utility model proposes and flicker.

Embodiment

See also shown in Figure 2, the utility model is eliminated the device of instantaneous mains fluctuations that cause of electric motor starting and flicker, be arranged in the compressor power loop, comprise the compressor power loop, serial connection one can reduce the circuit of electric motor starting electric current and raising electric motor starting moment on this compressor power loop, and it is made up of a power resistor R1, a polarity free capacitor C2 and a relay R L who contains time counter.Wherein, this power resistor R1 is serially connected in compressor one power supply L end, is used to reduce the electric motor starting electric current, thereby can reduces the startup power consumption, like this when compressor start, reduces to have reduced to the stable influence of supply voltage because of starting current; This polarity free capacitor C2 is attempted by the two ends of polarity free capacitor C, and polarity free capacitor C2 and polarity free capacitor C are connected in parallel, and can increase electric motor starting moment, shortens electrical power moment to carry out the transition to the dynamic time by static state; Contain time counter among the described relay R L, the contact of this relay R L is serially connected between this polarity free capacitor C2 and the C, in stipulated time after motor runs well, promptly by time counter timing among the relay R L, control relay RL contact is with the power resistor R1 short circuit of series connection, and polarity free capacitor C2 that will be in parallel with polarity free capacitor C open circuit returns to normal the compressor electric motor loop, thereby continues to keep compressor electric motor to move under its intrinsic electrical parameter.

In sum, the utility model is eliminated the device of instantaneous mains fluctuations that cause of electric motor starting and flicker, the power resistor that utilization is connected on electric motor loop reduces the electric motor starting electric current, polarity free capacitor C2 in parallel increases electric motor starting moment, having overcome hermetic compressor starts moment and causes the instantaneous decline problems of too of supply voltage, thereby satisfy the requirement of household electrical appliance outlet, therefore, very practical.

Claims

1. a device of eliminating instantaneous mains fluctuations that cause of electric motor starting and flicker comprises the compressor power loop, it is characterized in that:

Serial connection one reduces the circuit of electric motor starting electric current and raising electric motor starting moment on described compressor power loop, and it comprises: a power resistor R1, this power resistor R1 are serially connected in compressor one power supply L end; One polarity free capacitor C2, this polarity free capacitor C2 is attempted by the two ends of polarity free capacitor C; One contains the relay R L of time counter.

2. the device of instantaneous mains fluctuations that cause of elimination electric motor starting as claimed in claim 1 and flicker is characterized in that: the contact of described relay R L is serially connected between two polarity free capacitor C2 and the C.