CN208350969U - A kind of detection circuit and frequency converter - Google Patents
A kind of detection circuit and frequency converter Download PDFInfo
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- CN208350969U CN208350969U CN201820983531.0U CN201820983531U CN208350969U CN 208350969 U CN208350969 U CN 208350969U CN 201820983531 U CN201820983531 U CN 201820983531U CN 208350969 U CN208350969 U CN 208350969U
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Abstract
The utility model embodiment provides a kind of detection circuit and frequency converter, is related to field of circuit technology；The detection circuit includes: the rectification circuit connecting with three phase mains；The bleeder circuit being connected with the rectifying circuit；It is connect respectively with bleeder circuit and chip, waveform arrangement is carried out to the electric signal of bleeder circuit partial pressure, shaping circuit of the electric signal after output waveform arrangement to chip；The shaping circuit includes: diode, comparator, first resistor and first capacitor；Wherein, the anode of diode is connect with the positive signal input terminal and bleeder circuit of comparator respectively, and the cathode of diode and the negative signal input terminal of comparator connect；The first end of first resistor and the negative signal input terminal of comparator connect, second end ground connection；The first end of first capacitor and the negative signal input terminal of comparator connect, second end ground connection；The signal output end of comparator is connect with chip.The utility model embodiment can detect open phases of three-phase power source.
Description
Technical field
The utility model relates to field of circuit technology, and in particular to a kind of detection circuit and frequency converter.
Background technique
The power equipments such as frequency converter, motor need to be powered using three phase mains at present, by by three-phase alternating current
It is rectified into direct current, so that the work for power equipments such as frequency converter, motor provides electric power support.
However, open phases of three-phase power source is by the normal work (three-phase electricity of the power equipments such as strong influence frequency converter, motor
Source phase shortage refers to a certain phase or multiphase missing of three phase mains), therefore such as the how lower circuit structure of complexity, to three-phase electricity
Source phase shortage is detected very necessary.
Utility model content
In view of this, the utility model embodiment provides a kind of detection circuit and frequency converter, with the lower circuit of complexity
Structure detects open phases of three-phase power source.
To achieve the above object, the utility model embodiment provides the following technical solutions:
A kind of detection circuit, comprising:
It is connect with three phase mains, is the rectification circuit of direct current by the convert alternating current of three phase mains；
It is connect with the rectification circuit, the bleeder circuit that the direct current that the rectification circuit converts is divided；
It is connect respectively with the bleeder circuit and chip, waveform arrangement is carried out to the electric signal of bleeder circuit partial pressure,
Electric signal after output waveform arrangement gives the shaping circuit of the chip；
The shaping circuit includes: diode, comparator, first resistor and first capacitor；
Wherein, the anode of the diode connects with the positive signal input terminal of the comparator and the bleeder circuit respectively
It connects, the cathode of the diode is connect with the negative signal input terminal of the comparator；
The first end of the first resistor is connect with the negative signal input terminal of the comparator, second end ground connection；
The first end of the first capacitor is connect with the negative signal input terminal of the comparator, second end ground connection；
The signal output end of the comparator is connect with the chip.
Optionally, the rectification circuit includes: the second capacitor, third capacitor, second resistance and 3rd resistor；
Wherein, the first end of second capacitor is connect with DC bus anode, and the of second end and the third capacitor
One end connection；The second end of the third capacitor is connect with DC bus cathode；DC bus by the rectification circuit rectification
Bridge is drawn；
The first end of the second resistance is connect with DC bus anode, and the first end of second end and the 3rd resistor connects
It connects, the second end of the 3rd resistor is connect with DC bus cathode, and the second end ground connection of the 3rd resistor；
The second end of second capacitor is connect with the second end of the second resistance.
Optionally, the bleeder circuit includes: the 4th resistance and the 5th resistance；
Wherein, the first end of the 4th resistance is connect with DC bus anode, and the of second end and the 5th resistance
One end connection；
The second end of 5th resistance is connect with DC bus cathode.
Optionally, the anode of the diode connects between the 4th resistance and the 5th resistance.
Optionally, the resistance value of the first resistor is 200 kilo-ohms, and the capacity of the first capacitor is 1 microfarad, described the
The resistance value of four resistance is 520 kilo-ohms, and the resistance value of the 5th resistance is 10 kilo-ohms.
Optionally, the comparator is voltage comparator；Cathode power supply input the first power supply of termination of the comparator, bears
Pole power input ground connection.
Optionally, the voltage of first power supply is 15 volts.
Optionally, the detection circuit further include: the 6th resistance；
First termination second source of the 6th resistance, the second source are chip power supply；
The second end of 6th resistance connects between the comparator and the chip.
Optionally, the resistance value of the 6th resistance is 1 kilo-ohm, and the voltage of the second source is 5 volts.
The utility model embodiment also provides a kind of frequency converter, comprising: detection circuit described above.
Based on the above-mentioned technical proposal, the convert alternating current of three phase mains can be direct current by rectification circuit, and rectification circuit becomes
The direct current changed can be divided by bleeder circuit, so that shaping circuit can carry out waveform arrangement to the electric signal of partial pressure, it is defeated
Electric signal after waveform arranges out is to chip；And then chip can detect three-phase electricity based on the waveform of the electric signal after waveform arrangement
Source whether phase shortage；And shaping circuit can be used the lower circuit structure of complexity and realize, comprising: diode, comparator, and first
Resistance, first capacitor.The utility model embodiment can examine open phases of three-phase power source with the lower circuit structure of complexity
It surveys, and detection accuracy with higher.Further, the utility model embodiment is realizing the same of the pile defection of three phase mains
When, the ageing management function of DC bus is had both, it can be achieved that the detection function of detection circuit is diversified.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the structural schematic diagram of detection circuit provided by the embodiment of the utility model；
Fig. 2 is waveform diagram；
Fig. 3 is another structural schematic diagram of detection circuit provided by the embodiment of the utility model；
Fig. 4 is another waveform diagram；
Fig. 5 is another waveform diagram；
Fig. 6 is another structural schematic diagram of detection circuit provided by the embodiment of the utility model；
Fig. 7 is the another structural schematic diagram of detection circuit provided by the embodiment of the utility model；
Fig. 8 is another structural schematic diagram again of detection circuit provided by the embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1 is the structural schematic diagram of detection circuit provided by the embodiment of the utility model, and referring to Fig.1, which can
To include: rectification circuit 10, bleeder circuit 20, shaping circuit 30 and chip 40；
Wherein, rectification circuit 10 is connect with three phase mains, is direct current by the convert alternating current of three phase mains；Three phase mains
Possessed three-phase kilowatt-hour meter is shown as R (the first phase), S (the second phase), T (third phase).
Bleeder circuit 20 is connect with rectification circuit 10, and the direct current that rectification circuit 10 converts is divided；
Shaping circuit 30 is connect with bleeder circuit 20 and chip 40 respectively, carries out wave to the electric signal that bleeder circuit 20 divides
Shape arranges, and the electric signal after output waveform arrangement is to chip 40；
In utility model embodiment, shaping circuit 30 can be used the lower circuit structure of complexity and realize, such as Fig. 1 institute
Show, shaping circuit 30 may include: diode D, comparator 31, first resistor R1, first capacitor C1；
Wherein, the anode of diode D is connect with the positive signal input terminal of comparator 31 and bleeder circuit 20 respectively, two poles
The cathode of pipe D is connect with the negative signal input terminal of comparator 31；
The first end of first resistor R1 is connect with the negative signal input terminal of comparator 31, second end ground connection；
The first end of first capacitor C1 is connect with the negative signal input terminal of comparator 31, second end ground connection；
The signal output end of comparator 31 is connect with chip 40.
Based on structure shown in Fig. 1, when detecting to open phases of three-phase power source, rectification circuit 10 can be by the friendship of three phase mains
Galvanic electricity is transformed to direct current, and the direct current that rectification circuit 10 converts can be divided by bleeder circuit 20, thus shaping circuit
30 can carry out waveform arrangement to the electric signal of partial pressure, and the electric signal after output waveform arrangement is to chip 40；And then chip 40 can base
In waveform arrangement after electric signal waveform, detection three phase mains whether phase shortage；And that complexity can be used is lower for shaping circuit
Circuit structure realize, comprising: diode, comparator, first resistor, first capacitor.The utility model embodiment can be complicated
Lower circuit structure is spent, open phases of three-phase power source is detected, and detection accuracy with higher.
It is understood that the waveform of the electric signal after waveform arrangement is as shown in Figure 2, then it is assumed that open phases of three-phase power source；This
Utility model embodiment can be divided by the direct current that bleeder circuit converts rectification circuit, pass through circuit structure complexity
Lower shaping circuit carries out waveform arrangement to the electric signal of partial pressure, to detect three phase mains for chip, whether phase shortage is provided
Foundation realizes the detection to open phases of three-phase power source with the lower circuit structure of complexity.
It should be noted that it is to have rectification circuit 10 shown in Fig. 1, partial pressure that the utility model embodiment is claimed
Circuit 20, the detection circuit of shaping circuit 30 and chip 40, and shaping circuit 30 can be lower by complexity shown in FIG. 1
Circuit structure realizes that the waveform of electric signal arranges, and detecting three phase mains for chip, whether phase shortage provides foundation；And chip 40 can be with
The comparison that waveform shown in the waveform and Fig. 2 of the electric signal after waveform arrangement is carried out with various ways, can also use for reference existing wave
Shape comparison technology is realized.
Optionally, the resistance value of first resistor R1 can select 200 kilo-ohms, and certain specific value can also be according to the actual situation
Depending on；1uf (microfarad) can be selected in the capacity of first capacitor C1, certain specific value can also according to the actual situation depending on.
Further, optionally, chip 40 can select CPU (Central Processing Unit, central processing unit).
Further, optionally, rectification circuit 10 is in addition to it may include circuit structure of the convert alternating current for direct current, rectified current
Road 10 can also have circuit structure as shown in Figure 3；
Fig. 3 shows another structural schematic diagram of detection circuit provided by the embodiment of the utility model, referring to Fig. 3, rectification
(rectification circuit 10 realizes that convert alternating current is direct current to circuit 10 in addition to it may include circuit structure that convert alternating current is direct current
Circuit structure can refer to prior art realization, Fig. 3 no longer shows), may also include that the second capacitor C2, third capacitor C3, second
Resistance R2,3rd resistor R3；
Wherein, the first end of the second capacitor C2 is connect with DC bus anode P, the first end of second end and third capacitor C3
Connection；The second end of third capacitor C3 is connect with DC bus cathode N；DC bus is drawn by the rectifier bridge of rectification circuit 10；
The first end of second resistance R2 is connect with DC bus anode P, and second end is connect with the first end of 3rd resistor R3,
The second end of 3rd resistor R3 is connect with DC bus cathode N, and the second end ground connection of 3rd resistor R3；
The second end of second capacitor C2 is connect with the second end of second resistance R2；
Wherein, second resistance R2,3rd resistor R3 also function to partial pressure effect.
Optionally, the second capacitor C2 in circuit shown in Fig. 3, third capacitor C3, what second resistance R2,3rd resistor R3 were selected
Numerical value can be chosen according to the actual situation.
Detection circuit provided by the embodiment of the utility model can also be achieved straight in addition to the pile defection of achievable three phase mains
Flow the ageing management of bus；
In circuit structure shown in Fig. 3, shaping circuit 30 export waveform arrange after electric signal waveform as shown in figure 4,
Then there are aging conditions for DC bus；
Detection circuit provided by the embodiment of the utility model can have both straight while realizing the pile defection of three phase mains
The ageing management function of bus is flowed, it can be achieved that the detection function of detection circuit is diversified；
Further, if three phase mains not phase shortage, DC bus not aging, then after the waveform arrangement that shaping circuit 30 exports
The waveform of electric signal is as shown in Figure 5.
Further, optionally, Fig. 6 shows another structural representation of detection circuit provided by the embodiment of the utility model
Figure, on the basis of detection circuit shown in Fig. 6 is shown in Fig. 3, further illustrates the structure of bleeder circuit 20, certainly, shown in fig. 6
The structure of bleeder circuit 20 may be based on the basis of Fig. 1；
Referring to Fig. 6, bleeder circuit 20 includes: the 4th resistance R4, the 5th resistance R5；
Wherein, the first end of the 4th resistance R4 is connect with DC bus anode P, the first end of second end and the 5th resistance R5
Connection；
The second end of 5th resistance R5 is connect with DC bus cathode N；
Between anode connection the 4th resistance R4 and the 5th resistance R5 of the diode D of shaping circuit 30, to realize diode D
With the connection of bleeder circuit 20；Optionally, diode D can also be connect by other connection types with bleeder circuit 20.
Optionally, in circuit shown in Fig. 6, the resistance value of the 4th resistance R4 can be selected 520 kilo-ohms, and specific value can also basis
Depending on actual conditions；The resistance value of 5th resistance R5 can be selected 10 kilo-ohms, specific value can also according to the actual situation depending on.
Further, optionally, voltage comparator realization, the another knot of detection circuit as shown in Figure 7 can be selected in comparator 31
Structure schematic diagram, the cathode power supply input terminal of comparator 31 can meet the first power supply V1, and the voltage of the first power supply can select 15V
The realization of (volt), certain first power supply can also select other numerical value, can be depending on the circumstances；
The negative power supply input terminal of comparator 32 can be grounded.
Structure shown in Fig. 7 is may be based on shown in Fig. 1 or Fig. 3 certainly based on the basis of structure shown in Fig. 6.
Further, optionally, Fig. 8 shows another structural representation again of detection circuit provided by the embodiment of the utility model
Figure, as shown in Figure 8, further includes: the 6th resistance R6；
The first termination second source V2, second source V2 of 6th resistance R6 can be the power supply powered for chip 40；
Between the second end connection comparator 31 and chip 40 of 6th resistance R6.
Optionally, the 6th resistance R6 resistance value can be selected 1 kilo-ohm, certain specific value can also according to the actual situation and
It is fixed；The voltage of second source V2 can be selected 5V (volt) and realize, certain second source can also select other numerical value, visual specific feelings
Depending on condition；
Structure shown in Fig. 8 is may be based on shown in Fig. 1 or Fig. 3 or Fig. 6 certainly based on the basis of structure shown in Fig. 7.
Detection circuit provided by the embodiment of the utility model can realize three phase mains with the lower circuit structure of complexity
The detection of phase shortage, the normal work for power equipments such as frequency converter, motor provide safeguard；It further, can also be to DC bus
Aging detected, have a variety of detection functions.
Further, the utility model embodiment also provides a kind of frequency converter with above-mentioned detection circuit.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be real in other embodiments in the case where not departing from the core concept or range of the utility model
It is existing.Therefore, the present invention will not be limited to the embodiments shown herein, and be to fit to it is disclosed herein
Principle and the consistent widest scope of features of novelty.
Claims (10)
1. a kind of detection circuit characterized by comprising
It is connect with three phase mains, is the rectification circuit of direct current by the convert alternating current of three phase mains；
It is connect with the rectification circuit, the bleeder circuit that the direct current that the rectification circuit converts is divided；
It is connect respectively with the bleeder circuit and chip, waveform arrangement, output is carried out to the electric signal of bleeder circuit partial pressure
Electric signal after waveform arrangement gives the shaping circuit of the chip；
The shaping circuit includes: diode, comparator, first resistor and first capacitor；
Wherein, the anode of the diode is connect with the positive signal input terminal of the comparator and the bleeder circuit respectively,
The cathode of the diode is connect with the negative signal input terminal of the comparator；
The first end of the first resistor is connect with the negative signal input terminal of the comparator, second end ground connection；
The first end of the first capacitor is connect with the negative signal input terminal of the comparator, second end ground connection；
The signal output end of the comparator is connect with the chip.
2. detection circuit according to claim 1, which is characterized in that the rectification circuit includes: the second capacitor, third electricity
Hold, second resistance and 3rd resistor；
Wherein, the first end of second capacitor is connect with DC bus anode, the first end of second end and the third capacitor
Connection；The second end of the third capacitor is connect with DC bus cathode；DC bus is drawn by the rectifier bridge of the rectification circuit
Out；
The first end of the second resistance is connect with DC bus anode, and second end is connect with the first end of the 3rd resistor,
The second end of the 3rd resistor is connect with DC bus cathode, and the second end ground connection of the 3rd resistor；
The second end of second capacitor is connect with the second end of the second resistance.
3. detection circuit according to claim 2, which is characterized in that the bleeder circuit includes: the 4th resistance and the 5th
Resistance；
Wherein, the first end of the 4th resistance is connect with DC bus anode, the first end of second end and the 5th resistance
Connection；
The second end of 5th resistance is connect with DC bus cathode.
4. detection circuit according to claim 3, which is characterized in that the anode of the diode connects the 4th resistance
And the 5th between resistance.
5. detection circuit according to claim 4, which is characterized in that the resistance value of the first resistor is 200 kilo-ohms, institute
The capacity for stating first capacitor is 1 microfarad, and the resistance value of the 4th resistance is 520 kilo-ohms, and the resistance value of the 5th resistance is
10 kilo-ohms.
6. detection circuit according to claim 1-5, which is characterized in that the comparator is voltage comparator；
Cathode power supply input the first power supply of termination of the comparator, negative power supply input end grounding.
7. detection circuit according to claim 6, which is characterized in that the voltage of first power supply is 15 volts.
8. detection circuit according to claim 6, which is characterized in that further include: the 6th resistance；
First termination second source of the 6th resistance, the second source are chip power supply；
The second end of 6th resistance connects between the comparator and the chip.
9. detection circuit according to claim 8, which is characterized in that the resistance value of the 6th resistance is 1 kilo-ohm, described
The voltage of second source is 5 volts.
10. a kind of frequency converter characterized by comprising the described in any item detection circuits of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820983531.0U CN208350969U (en) | 2018-06-25 | 2018-06-25 | A kind of detection circuit and frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820983531.0U CN208350969U (en) | 2018-06-25 | 2018-06-25 | A kind of detection circuit and frequency converter |
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| CN208350969U true CN208350969U (en) | 2019-01-08 |
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| CN201820983531.0U Expired - Fee Related CN208350969U (en) | 2018-06-25 | 2018-06-25 | A kind of detection circuit and frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900975A (en) * | 2019-02-27 | 2019-06-18 | 山东汇科工控技术有限公司 | A kind of frequency converter input power method for detecting open phase |
| CN112068024A (en) * | 2020-09-30 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Fault detection method and fault detection circuit for three-phase alternating current source |
| WO2022252417A1 (en) * | 2021-06-02 | 2022-12-08 | 中山大洋电机股份有限公司 | Phase loss detection circuit for three-phase power source, and electric motor controller for bldc electric motor |
-
2018
- 2018-06-25 CN CN201820983531.0U patent/CN208350969U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900975A (en) * | 2019-02-27 | 2019-06-18 | 山东汇科工控技术有限公司 | A kind of frequency converter input power method for detecting open phase |
| CN109900975B (en) * | 2019-02-27 | 2022-01-11 | 山东汇科工控技术有限公司 | Method for detecting phase loss of input power supply of frequency converter |
| CN112068024A (en) * | 2020-09-30 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Fault detection method and fault detection circuit for three-phase alternating current source |
| WO2022252417A1 (en) * | 2021-06-02 | 2022-12-08 | 中山大洋电机股份有限公司 | Phase loss detection circuit for three-phase power source, and electric motor controller for bldc electric motor |
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Granted publication date: 20190108 Termination date: 20190625 |