CN215682171U - Rapid de-excitation circuit of aero-generator - Google Patents
Rapid de-excitation circuit of aero-generator Download PDFInfo
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- CN215682171U CN215682171U CN202121770490.5U CN202121770490U CN215682171U CN 215682171 U CN215682171 U CN 215682171U CN 202121770490 U CN202121770490 U CN 202121770490U CN 215682171 U CN215682171 U CN 215682171U
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Abstract
The utility model relates to a rapid demagnetization circuit of an aero-generator, which comprises a transient voltage suppression diode and a freewheeling diode, has the capability of rapid demagnetization and reliability, solves the problems of large transient fluctuation of normal voltage and long time for voltage recovery to a steady state of a direct-current power supply system, and improves the transient characteristic of the direct-current power supply system; the overvoltage fault protection method is optimized, overvoltage fault loss is reduced, and the requirement for controlling an excitation circuit of a direct-current power supply system can be well met.
Description
Technical Field
The utility model belongs to the design technology of a generator controller of a direct-current power supply system, relates to improvement of an excitation control circuit of the generator controller, and particularly relates to a novel rapid de-excitation circuit of an aircraft generator.
Background
The direct current power supply system is characterized in that voltage transient in transient characteristics is caused by load change or engine rotating speed change, particularly when a large load is suddenly unloaded, the traditional mode realizes elimination of excitation current by a method of lapping an excitation loop and the ground, the loop adopted by the method is long, the demagnetization time is slow, so that electromagnetic energy in an excitation winding cannot be instantly reduced, the voltage transient fluctuation is further influenced to be large, and the time from transient recovery to steady state is long, so that an effective and quick demagnetization mode is particularly critical; when the direct-current power supply system has overvoltage faults, the voltage of a voltage regulating point cannot be instantly lowered due to back electromotive force of an exciting winding, so that overvoltage fault loss cannot be reduced to the maximum extent; finally, aiming at the characteristics of a claw type motor, the total electromagnetic energy of the excitation winding is larger due to larger leakage inductance, and the de-excitation is more severe under the two conditions, so that the requirement for effectively and quickly transferring or absorbing the energy of the excitation winding is very urgent.
As shown in fig. 1, in a normal operating state, when a voltage regulating tube V1 is turned on, a voltage at a voltage regulating point flows to the ground through the voltage regulating tube V1 and an excitation winding, when the voltage regulating tube V1 is turned off, a current in the excitation winding realizes a follow current through a fly-wheel diode V2, and the fly-wheel diode V2 forms an excitation follow current circuit; under the fault protection state, the voltage regulating pipe V1 is disconnected, the exciting winding forms a demagnetization circuit through the fly-wheel diode V2, and the voltage is reduced through the resistance value of the exciting winding and the pipe voltage drop of the fly-wheel diode V2 in the demagnetization circuit.
Disclosure of Invention
The purpose of the utility model is: aiming at the characteristics of an excitation loop of an aviation direct-current power supply system, the rapid de-excitation circuit of the aviation generator is provided, and is suitable for an excitation control circuit of the generator of the aviation direct-current power supply system. The method solves the problems that the transient fluctuation of the normal voltage of the direct-current power supply system is large and the time for recovering the voltage to a steady state is long, and optimizes the transient characteristic of the direct-current power supply system.
In order to solve the technical problem, the technical scheme of the utility model is as follows:
a rapid de-excitation circuit of an aircraft generator,
the circuit comprises 1 transient voltage suppression diode V4, 1 freewheeling diode V2 and a demagnetization tube V3; the negative pole of 1 transient voltage suppression diode V4 introduced in the generator excitation control circuit is connected with the F-end of the excitation winding, the positive pole of the transient voltage suppression diode V4 is connected with the positive pole of a diode V2, and the negative pole of a diode V2 is connected with the emitter of the voltage regulating tube and the F + end of the excitation winding; the F-end of the excitation winding is connected with the drain electrode of the field suppression tube V3, the source electrode of the field suppression tube V3 is grounded, and the F-end of the excitation winding is connected with the anode of the fly-wheel diode V2 and the anode of the transient voltage suppression diode V4.
The freewheeling diode V2 and the transient voltage suppression diode V4 form an excitation freewheeling circuit and a demagnetization circuit, and partial voltage regulation point voltage can be reduced by the aid of the voltage drop of the freewheeling diode V2 during demagnetization.
The transient voltage suppression diode V4 is selected according to the normal transient requirement of the voltage regulation point. Specifically, the maximum reverse operating voltage of the tvs V4 is greater than the voltage at the regulation point in the normal operating range.
The triggering conditions for the turn-off of the demagnetization tube V3 are as follows: the F-voltage of the excitation winding reaches 34V.
The demagnetization tube V3 is a MOSFET tube.
The transient voltage suppression diode V4 has the reaction capacity of ns level and the instantaneous absorption capacity of ms level.
Preferably, the model of the transient voltage suppression diode V4 is 15KP 30A.
Preferably, the freewheeling diode V2 is model 2CZ 160.
The utility model has the beneficial effects that:
the circuit solves the problems of large transient fluctuation of normal voltage and long time for voltage recovery to a steady state of a direct current power supply system, and optimizes the transient characteristic of the direct current power supply system. The overvoltage fault processing method is optimized, and meanwhile, the overvoltage fault can be immediately protected, so that the overvoltage fault loss is greatly reduced, and the use requirement of excitation control of a generator of a power supply system is met.
The transient voltage suppression diode is adopted to complete rapid demagnetization, the transient voltage diode is rapid in response (ns level) and has strong capacity of instantly absorbing energy (within 1 ms), instantaneous transfer of energy can be achieved, conversion from passive demagnetization to active demagnetization is completed, demagnetization is rapid and reliable, and the requirement of a demagnetization circuit of a generator of a direct-current power supply system is completely met.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly explained. It is obvious that the drawings described below are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a general generator controller excitation control circuit;
fig. 2 is a schematic diagram of an excitation control circuit of an aircraft generator after a rapid de-excitation circuit is introduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Features of various aspects of embodiments of the utility model will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the utility model.
In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
Referring to fig. 2, the aviation generator rapid de-excitation circuit of the utility model comprises 1 transient voltage suppression diode V4, 1 freewheeling diode V2 and a de-excitation tube V3; the negative pole of 1 transient voltage suppression diode V4 introduced in the generator excitation control circuit is connected with the F-end of the excitation winding, the positive pole of the transient voltage suppression diode V4 is connected with the positive pole of a diode V2, and the negative pole of a diode V2 is connected with the emitter of the voltage regulating tube and the F + end of the excitation winding; the F-end of the excitation winding is connected with the drain electrode of the field suppression tube V3, the source electrode of the field suppression tube V3 is grounded, and the F-end of the excitation winding is connected with the anode of the fly-wheel diode V2 and the anode of the transient voltage suppression diode V4.
The working principle of the utility model is as follows: the novel aviation generator rapid de-excitation circuit is used as a part of a generator controller excitation control circuit, and a schematic block diagram of the novel aviation generator rapid de-excitation circuit is shown in fig. 2.
As shown in fig. 2, after the fast demagnetization circuit is introduced, in a normal working state, the demagnetization tube V3 is in a conduction state, when the voltage regulation tube V1 is in conduction, the voltage at the voltage regulation point flows to the ground through the voltage regulation tube V1, the excitation winding and the demagnetization tube V3, and when the voltage regulation tube V1 is in disconnection, the current in the excitation winding realizes follow current through the demagnetization tube V3 and the fly-wheel diode V2.
As shown in fig. 2, after the rapid de-excitation circuit is introduced, when the power supply system unloads a load suddenly, especially a large load suddenly, the voltage regulating tube V1 is disconnected, when the F-voltage of the excitation winding reaches 34V, the de-excitation tube V3 is disconnected, due to the inductance characteristic of the excitation winding, the back electromotive force of the excitation winding is instantly increased, after the F-voltage of the excitation winding reaches the breakdown voltage (not less than 34V) of the transient voltage suppression diode (the clamping voltage is not more than 50V), the transient voltage suppression diode V4 is rapidly switched on, and the freewheeling diode V2 and the excitation winding form a freewheeling circuit to rapidly absorb the energy of the excitation circuit, optimize the transient characteristic of the power supply system, so that the voltage transient process is more suitable for a 28V direct current normal transient voltage envelope curve in the power supply characteristic of a military standard aircraft.
As shown in fig. 2, after a fast demagnetization circuit is introduced, when overvoltage fault protection is performed, the voltage regulating tube V1 is turned off, when overvoltage reaches 34V, the demagnetization tube V3 is turned off, energy in an excitation winding is instantaneously transferred to the transient voltage suppression diode V4, so that the voltage of a regulation point is instantaneously reduced to realize immediate protection, and simultaneously, due to the fact that damage to various aspects and different degrees caused by overvoltage is large, the voltage of the voltage regulating point is instantaneously reduced, and overvoltage fault loss can be greatly reduced.
Examples
The model of the transient voltage suppression diode V4 is 15KP30A, and the model of the freewheeling diode V2 is 2CZ 160. Through verification, the rapid de-excitation loop can rapidly clamp the instantaneous maximum voltage of the voltage regulating point of the generator at 38V (the maximum voltage is not more than 50V required) when the power supply system suddenly unloads a load, and recovers to the normal voltage within 56ms (the maximum voltage is required to be less than 125ms), so that the transient characteristic of the direct-current power supply system is optimized; meanwhile, the voltage of the voltage regulating point can be instantly lowered in the case of overvoltage faults, so that the damage of devices and the like caused by the voltage of the larger voltage regulating point is avoided, the overvoltage fault loss is reduced, and the overvoltage fault protection processing method is optimized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (9)
1. The utility model provides an aeronautical generator circuit that goes out magnetism fast which characterized in that:
the circuit comprises 1 transient voltage suppression diode V4, 1 freewheeling diode V2 and a demagnetization tube V3; the negative pole of 1 transient voltage suppression diode V4 introduced in the generator excitation control circuit is connected with the F-end of the excitation winding, the positive pole of the transient voltage suppression diode V4 is connected with the positive pole of a diode V2, and the negative pole of a diode V2 is connected with the emitter of the voltage regulating tube and the F + end of the excitation winding; the F-end of the excitation winding is connected with the drain electrode of the field suppression tube V3, the source electrode of the field suppression tube V3 is grounded, and the F-end of the excitation winding is connected with the anode of the fly-wheel diode V2 and the anode of the transient voltage suppression diode V4.
2. The circuit of claim 1, wherein: the freewheeling diode V2 and the transient voltage suppression diode V4 form an excitation freewheeling circuit and a de-excitation circuit.
3. The circuit of claim 1, wherein: the transient voltage suppression diode V4 is selected according to the normal transient voltage requirement of the voltage regulation point.
4. The circuit of claim 1, wherein: the triggering conditions for the turn-off of the demagnetization tube V3 are as follows: the F-voltage of the excitation winding reaches 34V.
5. The circuit of claim 3, wherein: the maximum reverse operating voltage of the transient voltage suppression diode V4 is greater than the voltage at the voltage regulation point within the normal operating range.
6. The circuit of claim 3, wherein: the transient voltage suppression diode V4 has the reaction capacity of ns level and the instantaneous absorption capacity of ms level.
7. The circuit of claim 3, wherein: the model of the transient voltage suppression diode V4 is 15KP 30A.
8. The circuit of claim 3, wherein: the freewheeling diode V2 is model 2CZ 160.
9. The circuit of claim 4, wherein: the demagnetization tube V3 is a MOSFET tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770490.5U CN215682171U (en) | 2021-07-30 | 2021-07-30 | Rapid de-excitation circuit of aero-generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770490.5U CN215682171U (en) | 2021-07-30 | 2021-07-30 | Rapid de-excitation circuit of aero-generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215682171U true CN215682171U (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121770490.5U Active CN215682171U (en) | 2021-07-30 | 2021-07-30 | Rapid de-excitation circuit of aero-generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215682171U (en) |
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2021
- 2021-07-30 CN CN202121770490.5U patent/CN215682171U/en active Active
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| CB03 | Change of inventor or designer information |
Inventor after: Hu Xiaoju Inventor after: Li Kejie Inventor after: Dong Zhenhua Inventor before: Hu Xiaoju Inventor before: Li Kejie Inventor before: Dong Zhenhua |