CN102723907B - A kind of unloader and unloader system - Google Patents
A kind of unloader and unloader system Download PDFInfo
- Publication number
- CN102723907B CN102723907B CN201210231719.7A CN201210231719A CN102723907B CN 102723907 B CN102723907 B CN 102723907B CN 201210231719 A CN201210231719 A CN 201210231719A CN 102723907 B CN102723907 B CN 102723907B
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- unloader
- mosfet pipe
- switch mosfet
- inductor
- pulse width
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- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of unloader and unloader system; unloader comprises inductor, switch mosfet pipe, diode and current sampling resistor; described switch mosfet pipe repeats to open or close by the frequency of pulse width modulation under the control of pulse width modulation; with described inductor and the described reversal connection diode connect ensures that closing the energy of having no progeny being stored on described inductor at described switch mosfet pipe releases, and protects described switch mosfet pipe.Have employed technical scheme of the present invention, utilize the feature that inductor reduces along with its volume of raising of frequency, the operating frequency of suitable strobe pulse width modulated, can make unloader enough miniaturized, and not increase its hear rate.<!--1-->
Description
Technical field
The present invention relates to technical field of wind power generator, particularly relate to a kind of unloader and unloader system.
Background technology
Because the competition of cost price, in Chinese market, the small-sized wind power generator of nearly all less than 400 watts does not all brake and speed stabilizing or speed limiting function.As long as there is enough wind-force, blower fan just can turn, and just can generate electricity, the larger rotating speed of wind-force is faster.This is extremely dangerous, just once occurred in Inner Mongol blower fan because of rotating speed too high, blower fan head throws away, the case found beyond a kilometer.The personnel that do not cause of rejoice injure.This kind of small-sized wind power generator factory grows on trees in China, and price is all between 1000-2000 yuan, cheap, and user is easy to accept, now also in extensive application on market.
By normal safety requirement, wind-driven generator must have unloading function and could use.So-called unloading function is exactly, when wind-force excessive too urgent wind-driven generator is in light lotus or without lotus operating state time, wind-driven generator output voltage too high (exceeding limit value), now just drops into dump load and makes the work of wind-driven generator band heavy burden, thus rotation speed of fan is lowered.This method is really effective, usually all adopt power resistor to do dump load in prior art, but be there is following problem: one is that power resistor heating is too many, and the unloader be placed in lamp stand can be baked boiling hot lamp stand, and power resistor dare not place other electronic equipments nearby; Two is that the power of power resistor is little will burn out, and power is large after unloader drops into, and blower fan output voltage just drops to and can not charge, this is kind of a waste to wind resource; Three are most unloaders is all by Control, and dump load only has input/do not drop into two states, can cause very large impact, be unfavorable for the life-span extending blower fan, be also unfavorable for the utilance improving wind resource when State Transferring to blower fan.Therefore do dump load by power resistor can not thoroughly deal with problems.
Summary of the invention
The object of the invention is to propose a kind of take inductor as the unloader of dump load and the unloader system adopting one or more unloader as dump load, by adopting this unloader and unloader system, can solve that unloader volume of the prior art is large, dump load is overheated and in unloader input process, the problems such as impact being produced to wind-driven generator.
For reaching this object, the present invention by the following technical solutions:
A kind of unloader, comprises inductor, switch mosfet pipe, diode and current sampling resistor, wherein
Described inductor is connected with described switch mosfet pipe one end;
Described current sampling resistor one end is connected with the described switch mosfet pipe other end;
The described reversal of diode is at the other end of described current sampling resistor;
Described switch mosfet pipe repeats to open or close by the frequency of pulse width modulation under the control of pulse width modulation; with described inductor and the described reversal connection diode connect ensures that closing the energy of having no progeny being stored on described inductor at described switch mosfet pipe releases, and protects described switch mosfet pipe.
In technique scheme, preferably, also comprise operational amplifier, described operational amplifier is connected with described switch mosfet pipe and current sampling resistor, is sent to MICROCOMPUTER PROCESSING by after the signal of current sampling resistor amplifies.
Present invention also offers a kind of unloader system, comprise input voltage circuit, be no less than one unloader, current drives amplifier and control logic unit, main control microprocessor and LED state indicating member, wherein,
Described input voltage circuit provides operating voltage for operational amplifier and microcomputer control circuit;
Described unloader is connected with control logic unit with described current drives amplifier;
Described current drives amplifier is connected with described main control microprocessor with control logic unit;
Described LED state indicating member is connected with described main control microprocessor.
In technique scheme, preferably, described input voltage circuit comprises two-stage voltage stabilizing circuit further, and first order voltage stabilizing circuit is+15 volt voltages of operational amplifier work, and second level voltage stabilizing circuit is+5 volt voltages of microcomputer control circuit work.
Preferably, described input voltage circuit also comprises multilevel iudge circuit, generates off-load threshold voltage detection threshold and be sent to main control microprocessor according to input voltage.
Have employed technical scheme of the present invention, utilize the induction reactance of inductor with the feature of operating frequency change, suitably can to heighten pulse width modulation operating frequency to reduce to flow through the electric current of unloader, reach the object of off-load controlled current flow.Utilize the feature that inductor reduces along with its volume of raising of frequency, the operating frequency of suitable strobe pulse width modulated, can make unloader enough miniaturized, and not increase its hear rate.When pulse-width modulation frequency height to a certain extent, unloader is enough miniaturized, generates heat also little, just makes its life-span become possibility for a long time.In addition, what the initial pulse width modulated operating frequency of unloader arranged is higher, and when dump load is dropped into, the electric current flowing through dump load is enough little, it can not bring impact to the operating state of blower fan.Because dump load does not impact blower fan when dropping into, so can not affect the operating state of blower fan, blower fan can charge simultaneously, makes full use of wind energy.The application of unloader of the present invention substantially increases the reliability of blower fan, improves the utilance of wind resource, and extends the useful life of blower fan.
Accompanying drawing explanation
Fig. 1 is unloader circuit theory diagrams in the specific embodiment of the invention.
Fig. 2 is the element circuit schematic diagram of the dump load of unloader in the concrete real-time mode of the present invention.
Fig. 3 is the element circuit schematic diagram of the dump load of unloader belt current sampling amplifier in the concrete real-time mode of the present invention.
Fig. 4 is the element circuit schematic diagram of unloader power supply and off-load threshold generation circuit in the concrete real-time mode of the present invention.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with accompanying drawing.
As shown in Figure 1, disclose a kind of unloader in concrete real-time mode, comprise inductor L1, switch mosfet pipe Q4, reversal connection diode and current sampling resistor R21, wherein, inductor L1 is connected with one end of switch mosfet pipe Q4; Current sampling resistor R21 one end is connected with the switch mosfet pipe Q4 other end; The reversal of diode is at the other end of current sampling resistor R21.
In specific works, utilize inductor L1 to do dump load, utilize the relation between inductor and operating frequency, control the break-make of switch mosfet pipe with microcomputer, thus form the stable controllable current that flows through inductor, namely unload charged current.Described switch mosfet pipe presses pulse width modulation (PWM under the control of pulse width modulation; PulseWidthModulation) frequency repeats to open or close; with described inductor and the described reversal connection diode connect ensures that closing the energy of having no progeny being stored on described inductor at described switch mosfet pipe releases, and protects described switch mosfet pipe.
As shown in Figure 2, preferably, present invention also offers another kind of embodiment, operational amplifier LM2902 is also comprised in unloader, described operational amplifier is connected with described switch mosfet pipe and current sampling resistor, is sent to MICROCOMPUTER PROCESSING by after the signal of current sampling resistor amplifies.
In real work, dump load can modularized design, different according to blower fan rated power, configuration is different, the one or more dump load of flexible selection, i.e. off-load current channel, as shown in Figure 3, in unloader system, comprise input voltage circuit, be no less than the dump load of (off-load current channel), current drives amplifier and control logic unit, main control microprocessor and LED state indicating member, wherein, described input voltage circuit provides operating voltage for operational amplifier and microcomputer control circuit; Described unloader is connected with control logic unit with described current drives amplifier; Described current drives amplifier is connected with described main control microprocessor with control logic unit; Described LED state indicating member and described main control microprocessor (MPU, MicroProcessorUnit) are connected.
As shown in Figure 4, input voltage circuit comprises two-stage voltage stabilizing circuit further, and first order voltage stabilizing circuit is+15 volt voltages of operational amplifier work, and second level voltage stabilizing circuit is+5 volt voltages of microcomputer control circuit work.Described input voltage circuit also comprises multilevel iudge circuit, generates off-load threshold voltage detection threshold F_V+_GATE and be sent to main control microprocessor process according to input voltage.
The following detailed description of the specific works program of unloader system in blower fan power generation process:
Whether the circuit off-load threshold generation circuit multilevel iudge first according to Fig. 4 should drop into dump load, if should drop into, utilize the feature that the induction reactance of inductor L1 can change with operating frequency, suitably heighten pulse width modulation operating frequency to reduce to flow through the electric current of unloader, reach the object of off-load controlled current flow.Vice versa.
According to the concrete size of blower fan, and utilize the feature that inductor reduces along with its volume of raising of frequency, the operating frequency of suitable strobe pulse width modulated makes unloader enough miniaturized, and does not increase its hear rate.
When pulse-width modulation frequency height to a certain extent, unloader is enough miniaturized, generates heat also little, just makes its life-span become possibility for a long time.
In addition, what the initial pulse width modulated operating frequency of unloader arranged at work is higher, and when dump load is dropped into, the electric current flowing through dump load is enough little, it would not bring impact to the operating state of blower fan.Because dump load does not impact blower fan when dropping into, so can not affect the operating state of blower fan, blower fan can charge simultaneously, makes full use of wind energy.
Therefore, unloader system of the present invention has that volume is little, hear rate is little, impact little advantage to blower fan, and greatly can improve the reliability of blower fan, improves the utilance of wind resource, and extends the useful life of blower fan, have practical value widely.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, any people being familiar with this technology is in the technical scope disclosed by the present invention; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (2)
1. a unloader, is characterized in that, comprises inductor, switch mosfet pipe, diode and current sampling resistor, wherein
Described inductor is connected with described switch mosfet pipe one end;
Described current sampling resistor one end is connected with the described switch mosfet pipe other end;
The described reversal of diode is at the other end of described current sampling resistor;
Described switch mosfet pipe repeats to open or close by the frequency of pulse width modulation under the control of pulse width modulation; described diode ensures to close to have no progeny at described switch mosfet pipe the energy be stored on described inductor released, and protects described switch mosfet pipe.
2. unloader according to claim 1, is characterized in that, also comprises operational amplifier, and described operational amplifier is connected with described switch mosfet pipe and current sampling resistor, is sent to MICROCOMPUTER PROCESSING by after the signal of current sampling resistor amplifies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210231719.7A CN102723907B (en) | 2012-07-05 | 2012-07-05 | A kind of unloader and unloader system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210231719.7A CN102723907B (en) | 2012-07-05 | 2012-07-05 | A kind of unloader and unloader system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102723907A CN102723907A (en) | 2012-10-10 |
| CN102723907B true CN102723907B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210231719.7A Expired - Fee Related CN102723907B (en) | 2012-07-05 | 2012-07-05 | A kind of unloader and unloader system |
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| CN (1) | CN102723907B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047802B (en) * | 2014-06-19 | 2017-07-11 | 无锡曼克斯电子科技有限公司 | The control method that wind-driven generator speed limit speed stabilizing current limliting generates electricity |
| CN107800330B (en) * | 2017-11-21 | 2020-03-24 | 北京合力电气传动控制技术有限责任公司 | Braking circuit and device |
| CN112994056B (en) * | 2019-12-13 | 2024-04-12 | 阳光电源股份有限公司 | Off-grid power generation system, control method thereof and application system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2444297A (en) * | 2006-11-29 | 2008-06-04 | Boost Energy Systems Ltd | Wind turbine interconnection system |
| CN201663429U (en) * | 2010-01-20 | 2010-12-01 | 哈尔滨理工大学 | Off-grid type sine-wave wind power generation controller |
| CN102094758A (en) * | 2009-12-14 | 2011-06-15 | 谭宗享 | Electrodeless unloading system for wind driven generator |
| CN202918237U (en) * | 2012-07-05 | 2013-05-01 | 陈有欣 | Unloaded and unloader system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437586B (en) * | 2011-12-29 | 2014-05-21 | 欣达重工股份有限公司 | Energy storage and unloading device of wind power generation system and control method thereof |
-
2012
- 2012-07-05 CN CN201210231719.7A patent/CN102723907B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2444297A (en) * | 2006-11-29 | 2008-06-04 | Boost Energy Systems Ltd | Wind turbine interconnection system |
| CN102094758A (en) * | 2009-12-14 | 2011-06-15 | 谭宗享 | Electrodeless unloading system for wind driven generator |
| CN201663429U (en) * | 2010-01-20 | 2010-12-01 | 哈尔滨理工大学 | Off-grid type sine-wave wind power generation controller |
| CN202918237U (en) * | 2012-07-05 | 2013-05-01 | 陈有欣 | Unloaded and unloader system |
Non-Patent Citations (1)
| Title |
|---|
| 双馈型风力发电系统低电压穿越策略仿真;朱颖等;《电力自动化设备》;20100630;第30卷(第6期);第20页至第24页 * |
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| CN102723907A (en) | 2012-10-10 |
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