CN201383790Y

CN201383790Y - Novel AC temperature adjustment and speed regulation hair drier for addressing over-criterion harmonic current

Info

Publication number: CN201383790Y
Application number: CN200920050974U
Authority: CN
Inventors: 刘宇峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-05
Filing date: 2009-02-05
Publication date: 2010-01-13
Anticipated expiration: 2019-02-05

Abstract

A novel AC temperature adjustment and speed regulation hair drier for addressing over-criterion harmonic current belongs to a hair nursing appliance, intended for addressing over-criterion harmonic currents. The circuit of the hair drier is made up of a filter capacitor C1, a load resistor R1, speed regulation gear switches SW1 and SW2, temperature adjustment gear switches SW3 and SW4, heating wires 1, 2 and 3, and a motor, the filter capacitor C1 and the load resistor R1 are connected in parallel in a commercial power circuit; the heating wire 1 after being connected in series with the motor is connected in parallel in the speed regulation gear switch SW2 and the commercial power; the heating wire 2 is connected in series with the temperature adjustment gear switch SW3, the heating wire 3 is connected in series with the temperature adjustment gear switch SW4; speed regulation gear switches SW1 and SW2 are connected in series with the commercial power. By adopting electric heating wire voltage distribution, with voltage loaded on different electric heating wires at different gears, and the filter capacitor and the resistor additionally arranged at the front end of the circuit, the problems of the common-mode circuit and differential mode interference are solved. The circuit can not only realize the temperature adjustment and speed regulation, but also pass through three electromagnetic compatibility tests concerning disturbance voltage, disturbance power, and harmonic current respectively.

Description

Solve novel interchange temperature adjustment, the speed governing hair dryer of harmonic excess

Affiliated technical field

The utility model belongs to the hair-care utensil, aim at solve that harmonic current exceeds standard and can temperature adjustment, the alternating current blowing of speed governing.

Background technology

At present, all nonlinear loads can both produce harmonic current, especially Switching Power Supply, electric ballast, speed regulating device, diode etc.A large amount of harmonic currents have been introduced in these nonlinear electric energy conversions in electrical network.It not only makes, and other power consumption equipments are interfered, produce fault in the same electrical network, also can make the current in middle wire overload of electrical network, influence ability to transmit electricity.For the control of power grid quality and safeguard health, China has formulated standard GB17625.1-2003 " the harmonic current limit value that electromagnetic compatibility limit value low-voltage electrical and electronic equipment send (the every phase input current of equipment≤16A) ", and this standard is a compulsory standard.

On May 1st, 2002 rose, China comes into effect " mandatory product certification administrative provisions " (General Administration of Quality Supervision, Inspection and Quarantine o of the People's Republic of China's the 5th command), wherein the 5th the regulation all listing in " catalogue " product, must be approved qualified through the certification authority of national appointment, obtain the certificate of certification that DCB issues and be affixed by authentication marks after, can dispatch from the factory sale, import and in operational activity, use, hair dryer is mandatory product, need carry out the project of disturbance voltage, disturbance power, three electromagnetic compatibilities detections of harmonic current.

Hair dryer market is the world of import household electrical appliances at present, has occupied to surpass 90% ratio, and remaining is carved up by home brands, wherein, in the majority with the product of the Pearl River Delta and the Yangtze River Delta.But the hair dryer that domestic little factory produces is second-rate, and recently, Shanxi Province Administration of Quality and Technology Supervision has announced the quality monitoring sampling result to hair-care utensil product, has spot-check 15 batches hair-care utensil altogether, and qualified 7 batches, the sampling qualification rate is 46.67%.The hair dryer 95% that they produce all adopts the halfwave rectifier technology to reach the speed governing purpose, utilizes the single-phase electric conductivity of diode the operating current of motor in the hair dryer can be reduced by half.

But during the diode operation in this method, electric current be folk prescription to,

Owing to be periodic signal, above-mentioned function can be launched into fourier series:

i(t)＝I[1/π+(1/2)·Isinωt-(2/3π)·cos2ωt-(2/15π)·cos4ωt-(2/35π)·cos6ωt-……]

From following formula as seen, when being operated in diode, the electric current that flows through hair dryer contains direct current, fundamental current and a large amount of even-order harmonic electric currents.Finally caused the harmonic current of hair dryer to exceed standard.

A lot of producers are in order to allow the harmonic current test passes, and the cancellation diode removes speed-regulating function, for this difficult problem of harmonic excess, takes the method for avoiding always.

Summary of the invention

In order to overcome the defective of above-mentioned hair dryer circuit, the utility model provides a kind of novel interchange temperature adjustment, speed governing hair dryer circuit that solves harmonic excess.This circuit is not only realized temperature adjustment, speed governing, and three test events that can be by electromagnetic compatibility: disturbance voltage, disturbance power, harmonic current, thereby make producer obtain the certificate of certification that DCB issues and be affixed by authentication marks, need not rectify and improve waste plenty of time and money repeatedly.

The technical scheme that its technical problem that solves the utility model adopts is: adopt the heating wire dividing potential drop, when selecting different gears, voltage loads different heating wire places respectively, reaches the purpose of speed governing, temperature adjustment; Do not adopt the halfwave rectifier of diode, do not have a large amount of even-order harmonic electric currents, harmonic excess can solve.In addition, circuit front-end adds filter capacitor and resistance, has solved circuit common mode, differential mode harassing and wrecking, easily by disturbance voltage, these two projects of disturbance power.

The beneficial effects of the utility model are can pass through three test events of electromagnetic compatibility when realizing temperature adjustment, speed governing: disturbance voltage, disturbance power, harmonic current, and simple in structure.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further specified.Accompanying drawing is circuit theory diagrams of the present utility model.

Among the figure, C1 is a Y type filter capacitor, is connected between phase line and the ground wire; R1 is a load resistance, and is in parallel with filter capacitor; SW1, SW2 are the speed governing driving switch, and SW1 is that SW2 is a low speed at a high speed; SW3, SW4 are the temperature adjustment driving switch, and SW3 is a low-heat, and SW4 is high heat.C1, R1 also are connected in the mains circuit; Heating wire 1 is connected back and is connected in SW2 driving switch and the civil power with motor; Heating wire 2 is connected with the SW3 driving switch, and heating wire 3 is connected with the SW4 driving switch; SW1, SW2 driving switch serial connection civil power.

Embodiment

In the drawings, the C1 filter capacitor is that load resistance is in parallel with R1, and electric capacity is recharged during positive half cycle, capacitor discharge during negative half period, just can make and obtain level and smooth alternating current in the load, solve circuit common mode, differential mode harassing and wrecking, easily by disturbance voltage, these two projects of disturbance power.

SW1, SW2 are the speed governing driving switch, and when gear was beaten at SW1, the input voltage all-wave was added on the motor, and wind speed is at a high speed; When gear was beaten at SW2, input voltage was through heating wire 1 speed governing, and the size of speed can realize that wind speed is a low speed by the heating wire changes in resistance.Can avoid the halfwave rectifier of diode like this, thereby reduce the harmonic current of hair dryer the inside.

SW3, SW4 are the temperature adjustment driving switch, and when gear was beaten at SW3, heating wire 2 was less, is low-heat; When gear was beaten at SW4, heating wire 3 was bigger, was high heat, thereby reached the purpose of temperature adjustment.

Claims

1, a kind of novel interchange temperature adjustment, speed governing hair dryer that solves harmonic excess, its circuit is by filter capacitor (C1), load resistance (R1), speed governing driving switch (SW1, SW2), temperature adjustment driving switch (SW3, SW4), heating wire (1,2,3) and motor are formed, and it is characterized in that: filter capacitor (C1), load resistance (R1) also are connected in the mains circuit; Heating wire (1) is connected back and is connected in speed governing driving switch (SW2) and the civil power with motor; Heating wire (2) is connected with temperature adjustment driving switch (SW3), and heating wire (3) is connected with temperature adjustment driving switch (SW4); Speed governing driving switch (SW1, SW2) serial connection civil power.