CN103944468A - Excitation constant-current device for TFW brushless generator - Google Patents
Excitation constant-current device for TFW brushless generator Download PDFInfo
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- CN103944468A CN103944468A CN201410073909.XA CN201410073909A CN103944468A CN 103944468 A CN103944468 A CN 103944468A CN 201410073909 A CN201410073909 A CN 201410073909A CN 103944468 A CN103944468 A CN 103944468A
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Abstract
The invention relates to an excitation constant-current device for a TFW brushless generator. According to the excitation constant-current device, an input sampling voltage filtering amplifying circuit connected with a three-phase winding of the generator sequentially passes through a comparison amplifying circuit, a phase-shift trigger circuit and an excitation and rectification output circuit to be excited and output, a silicon controlled rectifying circuit and an overcurrent setting circuit of the excitation and rectification output circuit are connected with a differential amplifier and a first delay integral circuit, the overcurrent setting circuit is connected with the comparison amplifying circuit, the differential amplifier is connected with a generator excitation winding through an overcurrent output comparator, and the first delay integral circuit is respectively connected with the overcurrent output comparator and a second delay integral circuit. The additionally-arranged overcurrent setting circuit can monitor changes of the load current of the generator to adjust the intensity of the excitation current in real time so that output voltage of the generator can keep unchanged. The excitation constant-current device has the advantages of being stable in work and high in reliability and protecting the current in a constant-current mode.
Description
Technical field
The present invention relates to a kind of generator, is a kind of TFW brushless generator excitation constant-current device specifically, is applicable in the A.C. brushless synchronous generator excitation system below 1000KW.
Background technology
Traditional automatic voltage adjustor of power generator (AVR) is a kind ofly automatically to regulate the size of exciting current that generator output voltage is maintained in stable level according to the height of generator output voltage.Its overcurrent protection generally adopts the method for cutting off output switch or turn-offing energized circuit to protect.Will cause generator field winding current excessive overheated and burn if do not cut off output.
The shortcoming of traditional automatic voltage adjustor of power generator is: produce over current fault once generator, due to can be immediately without buffering course
Have a power failure.In some specific places, as hospital surgical carry out among, skyscraper elevator etc., because power-off suddenly will cause serious adverse consequences.
Summary of the invention
For the deficiencies in the prior art; the invention provides a kind of simple in structure; can be according to the weight of generator loading; thereby the size of adjusting in real time output exciting current makes the output voltage of generator remain constant, has the TFW brushless generator excitation constant-current device of excitation overcurrent constant current defencive function.
The technical solution used in the present invention is: a kind of TFW brushless generator excitation constant-current device, comprise excitation rectifying output circuit, phase-shift trigger circuit, relatively amplifying circuit and the input sampling voltage filter amplification circuit being connected with generator three phase windings, input sampling voltage filter amplification circuit is successively through comparing amplifying circuit, output is connected generator excitation winding to phase-shift trigger circuit with excitation rectifying output circuit excitation, its technical characterstic is that described excitation rectifying output circuit comprises SCR rectification circuit, exciting current sample circuit, overcurrent initialization circuit, differential amplifier, overcurrent output comparator, time delay integrating circuit and overcurrent lockout circuit, phase-shift trigger circuit connects SCR rectification circuit, SCR rectification circuit is all connected differential amplifier and time delay integrating circuit with overcurrent initialization circuit, overcurrent initialization circuit connects relatively amplifying circuit, differential amplifier connects generator excitation winding through overcurrent output comparator, time delay integrating circuit connects respectively overcurrent output comparator and time delay integrating circuit.
Further, described input sampling voltage filter amplification circuit connects in generator three phase windings and appoints two-phase, and current transformer is set on third phase, and current transformer connects input sampling voltage filter amplification circuit; The above-mentioned wantonly two excitation rectifying output circuits that are connected.
Further, described TFW brushless generator excitation constant-current device also comprises frequency protection circuit, and frequency protection circuit connects relatively amplifying circuit.
Further, described TFW brushless generator excitation constant-current device also comprises stability feedback circuit, and stability feedback circuit connects relatively amplifying circuit.
Further, described frequency protection circuit connects phase-shift trigger circuit.
Further, described stability feedback circuit connects phase-shift trigger circuit.
Again further, described overcurrent initialization circuit is adjustable constant-flow formula current foldback circuit.
Wrap and be provided with centre cap at the line of certain two-phase winding of the main winding of generator, these two centre caps are received working power and the sampling voltage of generator excitation constant-current device as this device.Current transformer on third phase is received the use of input sampling voltage filter amplification circuit as unit tune difference or parallel operation Synchronization Control.
Sampling voltage is level and smooth through rectification, amplify after, send into comparison amplifying circuit and inner reference voltage and compare, send more afterwards a controlled direct voltage.This direct voltage is sent into phase-shift trigger circuit, and its size has determined still lagging in advance of SCR trigger pulse phase place.Trigger impulse is sent into excitation rectifying output circuit and is controlled in real time the size of thyristor operating angle, thereby has adjusted the size of exciting current, and the excitation winding that generator is received in exciting current output remains unchanged the output voltage on generator three-phase terminal.
Adopt above technical scheme, the invention has the beneficial effects as follows:
1, from generator phase-phase voltage and come sampling voltage and from third phase current transformer come tune potential difference superpose, the wave detector of sending into input sampling voltage filter amplification circuit is become unidirectional pulsating voltage, after amplifying smoothly, obtain again a DC level of following generator output voltage variation and change, DC level compares with inner reference voltage in comparison amplifying circuit, produce more afterwards a controlled direct voltage, controlled DC level is by phase-phase sampling voltage, the voltage of stability feedback circuit, the signal of frequency protection circuit, the voltage four road signal co-controllings of constant current mode current foldback circuit.The effect of the guard signal of frequency protection circuit is: when the operating frequency of generator is during lower than 47Hz, reference voltage is dragged down the output voltage of generator is reduced, reduce the output exciting current of generator, the when red of frequency protection instruction is simultaneously reported to the police.The effect of the feedback voltage of stability feedback circuit is: in the time that the output voltage of generator is unstable, modification stability potentiometer just can make voltage stabilization get off; The effect of the voltage of constant current current foldback circuit is: in the time of generator generation over current fault, after left and right time delay in 20 seconds, reference voltage pulled down to a certain level drops the output level of open loop comparator, sawtooth amplitude diminishes, and thyristor operating angle reduces result gets back in the level that is less than output-current rating generator output current;
2, relatively deliver in phase-shift trigger circuit as the supply voltage of phase shift integrating circuit and produce sawtooth waveforms a string and that generator is synchronous when the controlled direct voltage of large circuit output, the size of this direct voltage can cause the variation of sawtooth waveforms climbing speed, the gate level of sawtooth waveforms and IC is compared and has been produced controllable silicon triggering square wave, triggering square wave receives on the gate pole of SCR rectification circuit, control the size of thyristor operating angle, formed our required exciter current of generator and realized excitation output;
3, in this device, the exciting current of SCR rectification circuit output is carried out to sampling pulse, capacitance integral, smoothly form overcurrent sample voltage, voltage sampling is the level and smooth adjustable constant-flow formula current foldback circuit of sending into after filtering later, constant current mode current foldback circuit is provided with a variable reference voltage, the two sends into sampling voltage and reference voltage in differential amplifier and integrator delay-time circuit simultaneously, differential amplifier amplifies the difference of the two, then send into overcurrent output comparator to obtain overcurrent protection Voltage-output, in the time that generator is normally worked, integrator delay-time circuit is sent a high level, and that overcurrent is exported to comparison circuit is locked, at this moment overcurrent output comparison circuit no-output, overcurrent protection is inoperative, when the moment that powerful motor is starting, starting current is very large, tend to exceed the output-current rating of generator, thereby be provided with the overcurrent that an integrator delay-time circuit large electric current when preventing due to motor start-up caused here and protect phenomenon by mistake, delay time is approximately set to 20 wonderful left and right.For the output current oscillations that prevents that generator from causing in the moment that enters overcurrent protection state; be provided with again an overcurrent lockout circuit here; generator is exported a high level in the time entering overcurrent protection state, and integrator delay-time circuit is locked, has ensured the stable output of overcurrent voltage.The degree of depth of overcurrent protection protects the size of (constant current) electric current to set by the position that regulates overcurrent protection potentiometer LIMT.When generator produces over current fault; be that load current is while exceeding rated current; adjustable constant-flow formula current foldback circuit can make exciting current drop; thereby the output current that makes generator is limited in a certain constant levels of current; be less than output-current rating, protected the line of generator to hold group and do not burnt.
The constant current mode current foldback circuit that the present invention be directed to while adopting the generator of conventional voltage adjuster to produce over current fault shortcoming that can unexpected power-off and set up; the size that can monitor the variation of generator loading electric current and adjust in real time exciting current remains unchanged generator output voltage; there is the advantages such as working stability, reliability are high, constant current protective current; unlikely burning when generator overcurrent; generator is manufactured to enterprise and produced good economic benefit, avoided the loss that user suffers in the time of power-off suddenly and the serious consequence that causes simultaneously.
Brief description of the drawings
Fig. 1 is structure diagram of the present invention;
Fig. 2 is excitation rectifying output circuit sketch of the present invention.
In figure: generator 1, main winding 2, excitation winding 3; input sampling voltage filter amplification circuit 4, relatively amplifying circuit 5, phase-shift trigger circuit 6; excitation rectifying output circuit 7, SCR rectification circuit 8, exciting current sample circuit 9; adjustable constant-flow formula current foldback circuit 10, differential amplifier 11, overcurrent output comparator 12; time delay integrating circuit 13; overcurrent lockout circuit 14, frequency protection circuit 15, stability feedback circuit 16.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Shown in Fig. 1,2, a kind of TFW brushless generator excitation constant-current device comprises input sampling voltage filter amplification circuit 4, compares amplifying circuit 5, phase-shift trigger circuit 6, excitation rectifying output circuit 7, SCR rectification circuit 8, exciting current sample circuit 9, adjustable constant-flow formula current foldback circuit 10, differential amplifier 11, overcurrent output comparator 12, time delay integrating circuit 13, overcurrent lockout circuit 14, frequency protection circuit 15 and stability feedback circuit 16.Wantonly two of generator 1 principal phase winding 2 is connected and inputs sampling voltage filter amplification circuit 4, current transformer on third phase connects input input sampling voltage filter amplification circuit 4, sampling voltage filter amplification circuit 4 is successively through comparing amplifying circuit 5, 7 excitation outputs are connected generator 1 excitation around 3 groups to phase-shift trigger circuit 6 with excitation rectifying output circuit, excitation rectifying output circuit 7 comprises SCR rectification circuit 8, exciting current sample circuit 9, adjustable constant-flow formula current foldback circuit 10, differential amplifier 11, overcurrent output comparator 12, time delay integrating circuit 13 and overcurrent lockout circuit 14, phase-shift trigger circuit 6 connects SCR rectification circuit 8, SCR rectification circuit 8 is all connected differential amplifier 11 and time delay integrating circuit 13 with adjustable constant-flow formula current foldback circuit 10, adjustable constant-flow formula current foldback circuit 10 connects relatively amplifying circuit 5, differential amplifier 11 connects generator excitation winding through overcurrent output comparator 12, time delay integrating circuit 13 connects respectively overcurrent output comparator 12 and time delay integrating circuit 11, frequency protection circuit 15 connects relatively amplifying circuit 5 and phase-shift trigger circuit 6, and stability feedback circuit 16 connects relatively amplifying circuit 5 and phase-shift trigger circuit 6.
Claims (7)
1. a TFW brushless generator excitation constant-current device, comprise excitation rectifying output circuit, phase-shift trigger circuit, relatively amplifying circuit and the input sampling voltage filter amplification circuit being connected with generator three phase windings, input sampling voltage filter amplification circuit is successively through comparing amplifying circuit, output is connected generator excitation winding to phase-shift trigger circuit with excitation rectifying output circuit excitation, it is characterized in that: described excitation rectifying output circuit comprises SCR rectification circuit, exciting current sample circuit, overcurrent initialization circuit, differential amplifier, overcurrent output comparator, time delay integrating circuit and overcurrent lockout circuit, phase-shift trigger circuit connects SCR rectification circuit, SCR rectification circuit is all connected differential amplifier and time delay integrating circuit with overcurrent initialization circuit, overcurrent initialization circuit connects relatively amplifying circuit, differential amplifier connects generator excitation winding through overcurrent output comparator, time delay integrating circuit connects respectively overcurrent output comparator and time delay integrating circuit.
2. TFW brushless generator excitation constant-current device according to claim 1, it is characterized in that: described input sampling voltage filter amplification circuit connects a two-phase in generator three phase windings, current transformer is set on third phase, and current transformer connects input sampling voltage filter amplification circuit; The above-mentioned wantonly two excitation rectifying output circuits that are connected.
3. TFW brushless generator excitation constant-current device according to claim 1, is characterized in that: described TFW brushless generator excitation constant-current device also comprises frequency protection circuit, and frequency protection circuit connects relatively amplifying circuit.
4. TFW brushless generator excitation constant-current device according to claim 1, is characterized in that: described TFW brushless generator excitation constant-current device also comprises stability feedback circuit, and stability feedback circuit connects relatively amplifying circuit.
5. TFW brushless generator excitation constant-current device according to claim 3, is characterized in that: described frequency protection circuit connects phase-shift trigger circuit.
6. TFW brushless generator excitation constant-current device according to claim 4, is characterized in that: described stability feedback circuit connects phase-shift trigger circuit.
7. according to the arbitrary described TFW brushless generator excitation constant-current device of claim 1-6, it is characterized in that: described overcurrent initialization circuit is adjustable constant-flow formula current foldback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410073909.XA CN103944468A (en) | 2014-03-03 | 2014-03-03 | Excitation constant-current device for TFW brushless generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410073909.XA CN103944468A (en) | 2014-03-03 | 2014-03-03 | Excitation constant-current device for TFW brushless generator |
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| CN103944468A true CN103944468A (en) | 2014-07-23 |
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| CN201410073909.XA Pending CN103944468A (en) | 2014-03-03 | 2014-03-03 | Excitation constant-current device for TFW brushless generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617492A (en) * | 2018-11-12 | 2019-04-12 | 浙江开创电气有限公司 | A kind of polishing machine and its guard method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2252435Y (en) * | 1995-07-16 | 1997-04-16 | 胡正昌 | D.C. generator constant-current, constant-voltage automatic adjusting protector |
| US20100214055A1 (en) * | 2009-02-20 | 2010-08-26 | Kabushiki Kaisha Yaskawa Denki | Electric vehicle inverter apparatus and protection method therefor |
| CN102307035A (en) * | 2011-09-08 | 2012-01-04 | 山东科技大学 | Novel management and control system of mining lithium iron phosphate direct current series excitation chopping speed regulation electric locomotive |
| CN102819227A (en) * | 2012-09-17 | 2012-12-12 | 贵州大学 | Automobile voltage regulating circuit |
-
2014
- 2014-03-03 CN CN201410073909.XA patent/CN103944468A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2252435Y (en) * | 1995-07-16 | 1997-04-16 | 胡正昌 | D.C. generator constant-current, constant-voltage automatic adjusting protector |
| US20100214055A1 (en) * | 2009-02-20 | 2010-08-26 | Kabushiki Kaisha Yaskawa Denki | Electric vehicle inverter apparatus and protection method therefor |
| CN102307035A (en) * | 2011-09-08 | 2012-01-04 | 山东科技大学 | Novel management and control system of mining lithium iron phosphate direct current series excitation chopping speed regulation electric locomotive |
| CN102819227A (en) * | 2012-09-17 | 2012-12-12 | 贵州大学 | Automobile voltage regulating circuit |
Non-Patent Citations (1)
| Title |
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| 顾小兴: "一种TFW发电机恒流励磁系统电路设计", 《黑龙江科技信息》, 25 May 2012 (2012-05-25) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617492A (en) * | 2018-11-12 | 2019-04-12 | 浙江开创电气有限公司 | A kind of polishing machine and its guard method |
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Application publication date: 20140723 |