CN109755928A - Anti-Back EMF Circuits and Drones - Google Patents
Anti-Back EMF Circuits and Drones Download PDFInfo
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- CN109755928A CN109755928A CN201910124073.4A CN201910124073A CN109755928A CN 109755928 A CN109755928 A CN 109755928A CN 201910124073 A CN201910124073 A CN 201910124073A CN 109755928 A CN109755928 A CN 109755928A
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Abstract
本发明适用于无人机技术领域，提供了一种防反向电动势电路和无人机。该防反向电动势电路包括：电压比较模块、滤波模块和包括至少三个开关管的开关管组；开关管组适于与外部电源和外部电调电机均连接，还与所述滤波模块和所述电压比较模块均连接；电压比较模块检测各个开关管的源极和栅极的电压，并在开关管的源极的电压大于或等于漏极的电压时控制各个开关管正常工作，在开关管的源极的电压小于漏极的电压时关闭各个开关管以使各个开关管内部的体二极管导通。本发明电路结构简单，成本低，能有效防止无人机产生的反向电动势，保护无人机的电路器件。
The invention is applicable to the technical field of unmanned aerial vehicles, and provides an anti-back electromotive force circuit and an unmanned aerial vehicle. The anti-back electromotive force circuit includes: a voltage comparison module, a filter module, and a switch tube group including at least three switch tubes; the switch tube group is suitable for being connected to both an external power supply and an external ESC motor, and is also connected to the filter module and all the switch tubes. The voltage comparison modules are all connected; the voltage comparison module detects the voltage of the source and gate of each switch tube, and controls each switch tube to work normally when the voltage of the source electrode of the switch tube is greater than or equal to the voltage of the drain. When the voltage of the source is lower than the voltage of the drain, each switch is turned off so that the body diode inside each switch is turned on. The circuit of the invention is simple in structure and low in cost, can effectively prevent the back electromotive force generated by the drone, and protect the circuit devices of the drone.
Description
Technical field
The invention belongs to automatic control technology field more particularly to a kind of anti-reverse electromotive force circuits and unmanned plane.
Background technique
With the development of unmanned air vehicle technique, the application field of unmanned plane is also more and more, the internal circuit configuration of unmanned plane
Also it becomes increasingly complex.The huge inverse electromotive force that the motor of traditional unmanned plane can generate when reduction of speed or stalling, it is huge
The power supply load voltage that big inverse electromotive force is applied to each circuit devcie and will lead in addition to motor increases, and is easy to burn out device
Part causes unmanned plane to be unable to operate normally.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of anti-reverse electromotive force circuit and unmanned planes, to solve existing skill
The inverse electromotive force that the motor of unmanned plane generates in art will lead to power supply load voltage and increase, and be easy the problem of burning out device.
First aspect of the embodiment of the present invention provides a kind of anti-reverse electromotive force circuit, comprising: voltage comparison module, filtering
Module and switching tube group including at least three switching tubes；
The switching tube group is suitable for being all connected with external power supply and external electrical tune motor, also with the filter module and described
Voltage comparison module is all connected with；
The voltage of the external power supply is input to the switching tube group by the filter module；The voltage comparison module
The source electrode of each switching tube and the voltage of grid are detected, and when the voltage of the source electrode of switching tube is greater than or equal to the voltage of drain electrode
Each switching tube is controlled to work normally, close each switching tube when the voltage of the source electrode of switching tube is less than the voltage of drain electrode so that
Body diode conducting inside each switching tube.
Optionally, the voltage comparison module includes input terminal, control terminal, output end and voltage end；The switching tube group
It include: first switch tube, second switch and third switching tube；
The source electrode of the source electrode of the first switch tube, the source electrode of the second switch and the third switching tube is and outside
Portion's power supply, the filter module are connected with the input terminal of the voltage comparison module；The grid of the first switch tube, described
The grid of the grid of two switching tubes and the third switching tube is connect with the control terminal of the voltage comparison module；Described first
The drain electrode of switching tube, the drain electrode of the second switch and the drain electrode of the third switching tube with external electrical tune motor, described
The output end of voltage comparison module is connected with voltage end.
Optionally, the switching tube is field-effect tube.
Optionally, the field-effect tube is NMOS field-effect tube.
Optionally, the voltage comparison module is diode chip for backlight unit.
Optionally, the diode chip for backlight unit is LM5050 chip；
The input pin of the LM5050 chip is connect with the input terminal of the voltage comparison module, the LM5050 chip
Control pin connect with the control terminal of the voltage comparison module, the output pin of the LM5050 chip and the voltage ratio
Output end compared with module connects, and the power pins of the LM5050 chip are connect with the power end of the voltage comparison module, institute
State the grounding pin ground connection of LM5050 chip.
Optionally, the voltage comparison module further includes diode；
The anode of the output pin of the LM5050 chip and diode connects, the power pins of the LM5050 chip with
The cathode of diode connects.
Optionally, the filter module includes: at least one filter capacitor；
The first end of the filter capacitor and the source electrode of the external power supply and each switching tube are all connected with, the filtered electrical
The second end of appearance is grounded.
Optionally, the filter module includes: first capacitor, the second capacitor and third capacitor；
The first end of the first end of the first capacitor, the first end of second capacitor and the third capacitor is and institute
External power supply is stated to connect with the source electrode of each switching tube, the second end of the first capacitor, the second end of second capacitor and
The second end of the third capacitor is grounded.
Optionally, the filter module is filtering chip.
Second aspect of the embodiment of the present invention provides a kind of unmanned plane, any one provided including such as embodiment first aspect
The anti-reverse electromotive force circuit.
Existing beneficial effect is the embodiment of the present invention compared with prior art: the anti-reverse electromotive force circuit mainly includes
Switching tube group, voltage comparison module and filter module, structure is simple, at low cost, install convenient；Wherein, voltage comparison module is examined
The source electrode of each switching tube and the voltage of grid are surveyed, and is greater than or equal to the voltage time control of drain electrode in the voltage of the source electrode of switching tube
It makes each switching tube to work normally, closes each switching tube when the voltage of the source electrode of switching tube is less than the voltage of drain electrode so that each
Body diode conducting inside a switching tube, the inverse electromotive force for effectivelying prevent unmanned plane to generate protect the circuit device of unmanned plane
Part.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structural schematic diagram of anti-reverse electromotive force circuit provided in an embodiment of the present invention；
Fig. 2 is the circuit diagram of anti-reverse electromotive force circuit provided in an embodiment of the present invention.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Embodiment one
Referring to Fig. 1, a kind of anti-reverse electromotive force circuit provided in this embodiment, comprising: switching tube group 100, voltage compare
Module 200 and filter module 300, switching tube group 100 include at least three switching tubes, voltage comparison module 200 include input terminal,
Control terminal, output end and voltage end.The source electrode and external power supply, filter module 300 and voltage comparison module 200 of each switching tube
Input terminal be all connected with, the grid of each switching tube is connect with the control terminal of voltage comparison module 200, the drain electrode of each switching tube
It is all connected with external electrical tune motor, the output end of voltage comparison module 200 and voltage end.It should be noted that being shown in Fig. 1
Switching tube group 100 including three switching tubes, but be not limited to this in the embodiment of the present invention, in other embodiments, switching tube
The number of group 100 can be three, four or five or more.
Specifically, the voltage of external power supply is input to switching tube group 100, voltage comparison module 200 by filter module 300
The source electrode of each switching tube and the voltage of grid are detected, and when the voltage of the source electrode of switching tube is greater than or equal to the voltage of drain electrode
Each switching tube is controlled to work normally, close each switching tube when the voltage of the source electrode of switching tube is less than the voltage of drain electrode so that
Body diode conducting inside each switching tube.
In practical application, the huge inverse electromotive force that unmanned plane motor can generate when reduction of speed or stalling is led
Power supply load voltage of the unmanned plane other than motor is caused to increase, if preventing inverse electromotive force from having 0.7V using diode
Tube voltage drop, and unmanned plane power is all KW rank, and the electric current of 2KW just has 40A, and needing the power of diode at this time is 28W,
Can cross 28W power diode size be it is quite huge, install it is also inconvenient.So the present embodiment uses voltage comparison module
200 and switching tube group 100 inverse electromotive force of motor is isolated, solve fly control and other power supply because voltage increase and
The problem of burning out.
It mainly include switching tube group 100, voltage comparison module 200 and filter module in above-mentioned anti-reverse electromotive force circuit
300, structure is simple, at low cost；Wherein, voltage comparison module 200 detects the source electrode of each switching tube and the voltage of grid, and
The voltage of the source electrode of switching tube controls each switching tube and works normally when being greater than or equal to the voltage of drain electrode, in the source electrode of switching tube
Voltage close each switching tube so that the body diode inside each switching tube is connected when being less than the voltage of drain electrode, effectively prevent
The inverse electromotive force that unmanned plane generates, protects the circuit devcie of unmanned plane.
Optionally, referring to fig. 2, the switching tube group 100 may include: first switch tube Q1, second switch Q2 and
Three switching tube Q3；The source electrode of the source electrode of first switch tube Q1, the source electrode of second switch Q2 and third switching tube Q3 with outside
Power supply, filter module 300 are connected with the input terminal of voltage comparison module 200；Grid, the second switch Q2 of first switch tube Q1
Grid and the grid of third switching tube Q3 connect with the control terminal of voltage comparison module 200；The drain electrode of first switch tube Q1,
The output of the drain electrode of second switch Q2 and the drain electrode of third switching tube Q3 with external electrical tune motor, voltage comparison module 200
End is connected with voltage end.
Optionally, each switching tube of the present embodiment can be field-effect tube, and referring to fig. 2, each switching tube can be
NMOS field-effect tube, source electrode and external power supply, filter module 300 and the voltage comparison module 200 of each NMOS field-effect tube
Input terminal is all connected with, and the grid of each NMOS field-effect tube is connect with the control terminal of voltage comparison module 200, each NMOS effect
Should the drain electrode of pipe be all connected with external electrical tune motor, the output end of voltage comparison module 200 and voltage end.
Optionally, the voltage comparison module 200 of the present embodiment can be diode chip for backlight unit.Referring to fig. 2, voltage comparison module
200 can be LM5050 chip, and LM5050 chip is ideal diode, and structure is simple, at low cost, while can control switching tube
Shutdown, be used for anti-counter electromotive force, protect the circuit of unmanned plane.Specifically, the input pin (IN pin) of LM5050 chip with
Input terminal (source electrode of first switch tube Q1, the source electrode of second switch Q2 and third switching tube Q3 of voltage comparison module 200
The total contact of source electrode) connection, the control terminal (the of the control pin (GATE pin) of LM5050 chip and voltage comparison module 200
The total contact of the grid of the grid of one switching tube Q1, the grid of second switch Q2 and third switching tube Q3) connection, LM5050 core
The output pin (OUT pin) of piece and output end (drain electrode of first switch tube Q1, second switch of voltage comparison module 200
The total contact of the drain electrode of the drain electrode and third switching tube Q3 of Q2) connection, the power pins (VS pin) and voltage of LM5050 chip
The power end of comparison module 200 connects, grounding pin (the GND pin and OFF pin) ground connection of LM5050 chip.
In one embodiment, the filter module 300 of the present embodiment may include: at least one filter capacitor.Filter capacitor
First end and the source electrode of the external power supply and each switching tube be all connected with, the second end ground connection of filter capacitor.Specifically, ginseng
See that Fig. 2, filter module 300 may include: first capacitor C1, the second capacitor C2 and third capacitor C3；The first of first capacitor C1
The first end at end, the first end of the second capacitor C2 and third capacitor C3 is connect with the source electrode of external power supply and each switching tube,
The second end of the second end of first capacitor C1, the second end of the second capacitor C2 and third capacitor C3 is grounded.
Optionally, filter module 300 can also be filtering chip.Filtering chip integrated level is high, and structure is simple, at low cost,
Stability is good, such as filter.
In conjunction with Fig. 2, the workflow of the anti-reverse electromotive force circuit of the present embodiment is illustrated, as follows:
The anti-reverse electromotive force circuit of this programme is in parallel using multiple NMOS field-effect tube and reversely uses, then passes through
The voltage swing of the source electrode and drain electrode of the more each NMOS field-effect tube of LM5050 chip controls NMOS fet switch.When
When the drain voltage of NMOS field-effect tube is higher than source voltage (the generating counter electromotive force) of NMOS field-effect tube, LM5050 chip is closed
NMOS field-effect tube is closed, electric current is connected by the body diode of NMOS field-effect tube itself at this time, because of NMOS field-effect tube
The drain voltage source voltage that is greater than NMOS field-effect tube time it is very of short duration (mS rank), so NMOS field-effect tube
Very little is lost, the loss of switching tube reduces.When the drain voltage of NMOS field-effect tube is less than or equal to the source of NMOS field-effect tube
When pole tension, NMOS field-effect tube is worked normally.
It mainly include switching tube group 100, voltage comparison module 200 and filter module 300, structure letter in above-described embodiment
It is single, at low cost, install convenient；Wherein, voltage comparison module 200 detects the source electrode of each switching tube and the voltage of grid, and
The voltage of the source electrode of switching tube controls each switching tube and works normally when being greater than or equal to the voltage of drain electrode, in the source electrode of switching tube
Voltage close each switching tube so that the body diode inside each switching tube is connected when being less than the voltage of drain electrode, effectively prevent
The inverse electromotive force that unmanned plane generates, protects the circuit devcie of unmanned plane.
Embodiment two
Based on the above embodiment one, a kind of unmanned plane is present embodiments provided, any provided including above-described embodiment one
Anti-reverse electromotive force circuit described in, it may have the beneficial effect of anti-reverse electromotive force circuit described in any of the above-described kind.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device is divided into different functional unit or module, more than completing
The all or part of function of description.Each functional unit in embodiment, module can integrate in one processing unit, can also
To be that each unit physically exists alone, can also be integrated in one unit with two or more units, it is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function list
Member, the specific name of module are also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.Above system
The specific work process of middle unit, module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
Including within protection scope of the present invention.
Claims (10)
1. a kind of anti-reverse electromotive force circuit characterized by comprising voltage comparison module, filter module and including at least three
The switching tube group of a switching tube；
The switching tube group be suitable for be all connected with external power supply and external electrical tune motor, also with the filter module and the voltage
Comparison module is all connected with；
The voltage of the external power supply is input to the switching tube group by the filter module；The voltage comparison module detection
The source electrode of each switching tube and the voltage of grid, and controlled when the voltage of the source electrode of switching tube is greater than or equal to the voltage of drain electrode
Each switching tube works normally, and closes each switching tube so that each when the voltage of the source electrode of switching tube is less than the voltage of drain electrode
Body diode conducting inside switching tube.
2. anti-reverse electromotive force circuit as described in claim 1, which is characterized in that the voltage comparison module includes input
End, control terminal, output end and voltage end；The switching tube group includes: first switch tube, second switch and third switching tube；
The source electrode of the source electrode of the first switch tube, the source electrode of the second switch and the third switching tube is and external electrical
Source, the filter module are connected with the input terminal of the voltage comparison module；The grid of the first switch tube, described second open
The grid of the grid and the third switching tube that close pipe is connect with the control terminal of the voltage comparison module；The first switch
The drain electrode of pipe, the drain electrode of the second switch and the drain electrode of the third switching tube with external electrical tune motor, the voltage
The output end of comparison module is connected with voltage end.
3. anti-reverse electromotive force circuit as claimed in claim 2, which is characterized in that the switching tube is field-effect tube.
4. anti-reverse electromotive force circuit as claimed in claim 3, which is characterized in that the field-effect tube is NMOS field-effect
Pipe.
5. anti-reverse electromotive force circuit as claimed in claim 2, which is characterized in that the voltage comparison module is diode core
Piece.
6. anti-reverse electromotive force circuit as claimed in claim 5, which is characterized in that the diode chip for backlight unit is LM5050 core
Piece；
The input pin of the LM5050 chip is connect with the input terminal of the voltage comparison module, the control of the LM5050 chip
Pin processed is connect with the control terminal of the voltage comparison module, the output pin of LM5050 chip mould compared with the voltage
The output end of block connects, and the power pins of the LM5050 chip are connect with the power end of the voltage comparison module, described
The grounding pin of LM5050 chip is grounded.
7. such as anti-reverse electromotive force circuit as claimed in any one of claims 1 to 6, which is characterized in that the filter module includes:
At least one filter capacitor；
The first end of the filter capacitor and the source electrode of the external power supply and each switching tube are all connected with, the filter capacitor
Second end ground connection.
8. such as anti-reverse electromotive force circuit as claimed in any one of claims 1 to 6, which is characterized in that the filter module includes:
First capacitor, the second capacitor and third capacitor；
The first end of the first end of the first capacitor, the first end of second capacitor and the third capacitor with it is described outer
Portion's power supply is connected with the source electrode of each switching tube, the second end of the first capacitor, the second end of second capacitor and described
The second end of third capacitor is grounded.
9. such as anti-reverse electromotive force circuit as claimed in any one of claims 1 to 6, which is characterized in that the filter module is filter
Wave chip.
10. a kind of unmanned plane, which is characterized in that including anti-reverse electromotive force circuit as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910124073.4A CN109755928A (en) | 2019-02-19 | 2019-02-19 | Anti-Back EMF Circuits and Drones |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910124073.4A CN109755928A (en) | 2019-02-19 | 2019-02-19 | Anti-Back EMF Circuits and Drones |
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| Publication Number | Publication Date |
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| CN201910124073.4A Pending CN109755928A (en) | 2019-02-19 | 2019-02-19 | Anti-Back EMF Circuits and Drones |
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Cited By (2)
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| CN110880748A (en) * | 2019-10-08 | 2020-03-13 | 布法罗机器人科技（成都）有限公司 | Multi-motor back electromotive force discharge circuit and system for rehabilitation robot |
| CN110901396A (en) * | 2019-11-25 | 2020-03-24 | 航天时代飞鸿技术有限公司 | Anti-mutual-charging circuit and method for power supply of multiple battery packs of four-rotor aircraft |
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Application publication date: 20190514 |