CN2575897Y

CN2575897Y - Printing wireless public telephone

Info

Publication number: CN2575897Y
Application number: CN 02213774
Authority: CN
Inventors: 石睿
Original assignee: KANGWEI ELECTRONIC CO Ltd SHANDONG; KANGWEI ELECTRONIC CO Ltd SHAN
Current assignee: KANGWEI ELECTRONIC CO Ltd SHANDONG; KANGWEI ELECTRONIC CO Ltd SHAN
Priority date: 2002-04-08
Filing date: 2002-04-08
Publication date: 2003-09-24
Anticipated expiration: 2012-04-08

Abstract

The utility model is applies to a charging device of a wind-driven AC generator. Through an induction coil is connected with the output end of the AC generator in series, the output current of the generator can be limited to a certain extent to prevent the generator to put out oversize current when running rapidly to prevent components of the whole device from being damaged by oversized current. The strength of the current-limiting action by electrical inductance is changed with the change of voltage frequency generated by the generator, and the voltage is in direct proportion with the frequency. That is to say, the inductive reactance of the electrical inductance is changed with the change of voltage generated by the generator. When the voltage generated by the generator is high, the current-limiting action of the electrical inductance is strong, while when the voltage generated by the generator is low, the current-limiting action of the electrical inductance is weak. Therefore, the utility model preferably solves the contradiction between charging and current limiting.

Description

The wind-driven generator current-limiting circuit

The utility model is applied to exchange in the wind-driven generator charging device.Can limit the output current of generator to a certain extent, prevent that the electric current of output when generator runs up is excessive, protect the components and parts of whole device not damage because of electric current is excessive.

Many current limiting techniques about wind generator system are arranged in the prior art.As: the utility model patent " the dual-purpose charge inverter of solar wind power " of " the electronic circuit encyclopedia " that in October, 1989, Science Press published (second volume) the 70th page of " wind power battery charger ", the utility model patent " High efficiency charger " of application on December 16th, 1994, application on July 17th, 1996, charge-current limit technology wherein all is to implement in the DC circuit of whole device.And the utility model is to carry out the electric current restriction in the alternating current circuit of whole device.

The utility model is that the output at alternating current generator seals in inductance coil, and is excessive with the restriction electric current.Fig. 1 is the winding diagram of using in single-phase alternator (or threephase alternator is made single-phase generator usefulness); Fig. 2 is the winding diagram that seals in 3 inductance in threephase alternator; Fig. 3 is the winding diagram that seals in 2 inductance in threephase alternator; Fig. 4 is the winding diagram that seals in 1 inductance in threephase alternator.In threephase generator, seal in the power that how much is determining metering function of inductance.Fig. 2 metering function is the strongest, and Fig. 3 takes second place, and Fig. 4 is the most weak.What of inductance are the size that can bear electric current according to circuit in the actual practicality select to seal in.

Operation principle of the present utility model is as follows: after the alternating current generator output seals in inductance coil, because inductance has certain induction reactance to alternating current, so, limited the output current of generator to a certain extent, excessive with the output current that prevents generator when wind-force is excessive, cause the damage of components and parts in the circuit.When wind-force was little, the rotating speed of generator was relatively slow, and the voltage of generator output is lower, and the frequency of output voltage is also lower, and the induction reactance of inductance is less, metering function a little less than; When wind-force was big, the rotating speed of generator was very fast, and the voltage of output is higher, and the frequency of output is also higher, and the induction reactance of inductance is bigger, and the effect of current limliting is stronger.In other words, the power of current limit by inductance effect is to change with the variation that generator sends the height of electric voltage frequency, and voltage is directly proportional with frequency, that is to say, the induction reactance of inductance changes with the change in voltage that generator sends, and when the voltage that generator sends was high, the metering function of inductance was stronger, when the voltage that generator sends hangs down, the metering function of inductance a little less than.

Fig. 5 is a physical circuit (part of only having drawn major loop) that seals in 3 inductance.The voltage that generator sends is behind current limit by inductance, again through diode rectification, to charge in batteries.Inductance has limited the maximum current of generator output, makes circuit safety work.

Inductance of the present utility model can be to have coil or air core coil unshakable in one's determination.

The number of turn of inductance coil can be between 10 to 2000 circles.

The area of core section of inductance coil can be between 0.1 square centimeter to 100 square centimeters.

Claims

1, the current-limiting circuit in a kind of wind-driven generator charging device is characterized in that being connected with other circuit behind the output tandem electric inductance coil of wind-driven generator again.

2, inductance coil according to claim 1, the number of turn that it is characterized in that coil is between 10 to 2000 circles.

3, inductance coil according to claim 1, the area of core section that it is characterized in that inductance coil is between 0.1 square centimeter to 100 square centimeters.