CN206225989U - Three-phase voltage open-phase protection circuit - Google Patents
Three-phase voltage open-phase protection circuit Download PDFInfo
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- CN206225989U CN206225989U CN201621315523.6U CN201621315523U CN206225989U CN 206225989 U CN206225989 U CN 206225989U CN 201621315523 U CN201621315523 U CN 201621315523U CN 206225989 U CN206225989 U CN 206225989U
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- commutation diode
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- divider resistance
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- voltage
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- 239000003990 capacitor Substances 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model relates to a three-phase voltage open-phase protection circuit, including sampling circuit and protection circuit, wherein this sampling circuit includes: the three-phase rectifier circuit comprises a first alternating current voltage-dividing resistor, a second alternating current voltage-dividing resistor, a third alternating current voltage-dividing resistor, a three-phase bridge rectifier circuit and a filter capacitor C1; the protection circuit comprises a singlechip U1 for phase-loss detection and judgment; the first alternating current voltage-dividing resistor, the second alternating current voltage-dividing resistor and the third alternating current voltage-dividing resistor have the same resistance value; the three-phase bridge rectifier circuit consists of three pairs of rectifier diodes; the terminal voltage of the filter capacitor C1 is provided to the single chip microcomputer U1 as a sampling voltage Vad. The utility model provides a three-phase voltage phase loss protection circuit is with low costs and simple structure, has just realized the detection and the judgement of phase loss state.
Description
Technical field
The utility model is related to a kind of protection circuit, and in particular to a kind of phase of three-phase voltage protection circuit.
Background technology
Three-phase alternating current is a kind of transporting pattern of electric energy, referred to as three-phase electricity.Three-phase alternating-current supply, is by three frequencies
Identical, amplitude is equal, phase successively 120 ° of mutual deviation exchange potential composition power supply.The purposes of three-phase alternating current is a lot, industry
In most AC electric equipment, such as motor, all using three-phase alternating current, that is, the three-phase and four-line for frequently referring to
System.And in daily life, more using single phase poaer supply, also referred to as power for illumination.
Three-phase electric power open phase be exactly in power supply the no-voltage of power line all the way therein or voltage it is low, three-phase input voltage phase shortage
Harm it is very big, be compressor drive for load, if frequency converter is still in operation after three-phase input voltage phase shortage, then female
Line capacitance will be charged on a large scale repeatedly, and this can be greatly attenuated the life-span of bus capacitor, and bus electricity can be even damaged when serious
Hold.It is motor for load, if three-phase input voltage phase shortage, will imply that input voltage single-phase operation, voltage has no
Change, but electric current can substantially exceed motor rated current, and winding can be burned.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of phase of three-phase voltage protection circuit, particular technique
Scheme is as follows.
A kind of phase of three-phase voltage protection circuit includes sample circuit and protection circuit, and the wherein sample circuit includes：The
One exchange divider resistance, the second exchange divider resistance, the 3rd exchange divider resistance, three-phase bridge rectifier circuit and filter capacitor
C1；The protection circuit is included for pile defection and the single-chip microcomputer U1 for judging；
Wherein, the resistance of the first exchange divider resistance, the second exchange divider resistance and the 3rd exchange divider resistance is identical；
Three-phase bridge rectifier circuit is made up of three pairs of commutation diodes, and first pair of commutation diode includes the pole of the first rectification two
Pipe D1 and the 4th commutation diode D4, the positive pole of the first commutation diode D1 is connected with the negative pole of the 4th commutation diode D4；The
The two pairs of commutation diodes include the second commutation diode D2 and the 5th commutation diode D5, the positive pole of the second commutation diode D2 with
The negative pole connection of the 5th commutation diode D5；3rd pair of commutation diode includes the 3rd commutation diode D3 and the pole of the 6th rectification two
Pipe D6, the positive pole of the 3rd commutation diode D3 is connected with the negative pole of the 6th commutation diode D6；
The negative pole of the negative pole of the first commutation diode D1, the negative pole of the second commutation diode D2 and the 3rd commutation diode D3
Together it is connected to one end of filter capacitor C1, the positive pole of the 4th commutation diode D4, the positive pole of the 5th commutation diode D5 and
The positive pole of six commutation diode D6 is together connected to the other end of filter capacitor C1 and is grounded SGND；
First exchange divider resistance one end is connected to A phase voltages, and the other end is connected to the positive pole of the first commutation diode D1
With the negative pole of the 4th commutation diode D4；Second exchange divider resistance one end is connected to B phase voltages, and it is whole that the other end is connected to second
The positive pole of stream diode D2 and the negative pole of the 5th commutation diode D5；3rd exchange divider resistance one end is connected to C phase voltages, separately
One end is connected to the positive pole of the 3rd commutation diode D3 and the negative pole of the 6th commutation diode D6；
Used as sampled point, the terminal voltage of filter capacitor C1 is used as sampled voltage Vad for described one end of filter capacitor C1, there is provided
Give single-chip microcomputer U1.
Additionally, the circuit is also connected in parallel on filter capacitor C1 two ends including sampling resistor R10, the sampling resistor R10.
Wherein, the first exchange divider resistance is made up of three resistance R1, R4 and R7, and the second exchange divider resistance is by three electricity
Resistance R2, R5 and R8 composition, the 3rd exchange divider resistance is made up of three resistance R3, R6 and R9.
The beneficial effects of the utility model：
The utility model proposes phase of three-phase voltage protection circuit low cost and simple structure, be achieved that non-full-phase state
Detection with judge.In addition, the utility model proposes the sampling of phase of three-phase voltage protection circuit it is accurate, only need to take single-chip microcomputer
One AD mouthfuls.
Brief description of the drawings
Fig. 1 be the utility model proposes phase of three-phase voltage protection circuit structure chart；
Fig. 2 is the oscillogram of three-phase input voltage U in the utility model；
Fig. 3 be the utility model proposes sampled voltage of the phase of three-phase voltage protection circuit when input voltage is normal
The oscillogram of Vad；
Fig. 4 be the utility model proposes sampled voltage of the phase of three-phase voltage protection circuit in input voltage phase shortage
The oscillogram of Vad.
Specific embodiment
To make the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with specific embodiment, and
Referring to the drawings, the utility model is further described.But those skilled in the art know, the utility model is not limited to
Accompanying drawing and following examples.
The utility model proposes a kind of phase of three-phase voltage protection circuit as shown in figure 1, including sample circuit and protection
Circuit, the wherein sample circuit include：First exchange divider resistance, the second exchange divider resistance, the 3rd exchange divider resistance, three
Phase bridge rectifier, filter capacitor C1 and sampling resistor R10.The protection circuit is included for pile defection and the list for judging
Piece machine U1.
Wherein, the resistance of the first exchange divider resistance, the second exchange divider resistance and the 3rd exchange divider resistance is identical.
Three-phase bridge rectifier circuit is made up of three pairs of commutation diodes, and first pair of commutation diode includes the pole of the first rectification two
Pipe D1 and the 4th commutation diode D4, the positive pole of the first commutation diode D1 is connected with the negative pole of the 4th commutation diode D4；The
The two pairs of commutation diodes include the second commutation diode D2 and the 5th commutation diode D5, the positive pole of the second commutation diode D2 with
The negative pole connection of the 5th commutation diode D5；3rd pair of commutation diode includes the 3rd commutation diode D3 and the pole of the 6th rectification two
Pipe D6, the positive pole of the 3rd commutation diode D3 is connected with the negative pole of the 6th commutation diode D6.
The negative pole of the negative pole of the first commutation diode D1, the negative pole of the second commutation diode D2 and the 3rd commutation diode D3
Together it is connected to one end of filter capacitor C1, the positive pole of the 4th commutation diode D4, the positive pole and the 6th of the 5th commutation diode D5
The positive pole of commutation diode D6 is together connected to the other end of filter capacitor C1 and is grounded SGND.
First exchange divider resistance one end is connected to A phase voltages, and the other end is connected to the positive pole of the first commutation diode D1
With the negative pole of the 4th commutation diode D4；Second exchange divider resistance one end is connected to B phase voltages, and it is whole that the other end is connected to second
The positive pole of stream diode D2 and the negative pole of the 5th commutation diode D5；3rd exchange divider resistance one end is connected to C phase voltages, separately
One end is connected to the positive pole of the 3rd commutation diode D3 and the negative pole of the 6th commutation diode D6.
Sampling resistor R10 is connected in parallel on filter capacitor C1 two ends.
Used as sampled point, the terminal voltage of filter capacitor C1 is used as sampled voltage Vad for described one end of filter capacitor C1, there is provided
Give single-chip microcomputer U1.
In Fig. 1, the first exchange divider resistance is made up of three resistance R1, R4 and R7, and the second exchange divider resistance is by three
Individual resistance R2, R5 and R8 composition, the 3rd exchange divider resistance is made up of three resistance R3, R6 and R9.
Above-mentioned phase of three-phase voltage protection circuit obtains sampled voltage Vad by electric resistance partial pressure and diode bridge rectification,
Sampled voltage Vad and the proportional relations of three-phase input voltage U, sampled voltage Vad input to single-chip microcomputer U1, and single-chip microcomputer U1 is according to adopting
Sample voltage Vad calculates three-phase input voltage value.
The waveform of the three-phase input voltage U of the phase of three-phase voltage protection circuit is as shown in Fig. 2 sampled voltage when normal
The waveform of Vad is as shown in figure 3, the waveform of sampled voltage Vad is as shown in Figure 4 during phase shortage.
Single-chip microcomputer U1 judges the crest number of sampling in the cycle by sampled voltage Vad, judges three-phase according to crest number defeated
Enter voltage U whether phase shortage.When single-chip microcomputer U1 judges three-phase input voltage U phase shortages, then the instruction for turning off runtime is sent, from
And load equipment is protected in time.
In addition, single-chip microcomputer U1 can also calculate three-phase input voltage value according to sampled voltage Vad, so as to judge three-phase input
Whether voltage U is too low or too high, if to calculate three-phase input voltage U too low or too high for single-chip microcomputer U1, sends pass
Fall the instruction of runtime, so as to protect load equipment.
More than, implementation method of the present utility model is illustrated.But, the utility model is not limited to above-mentioned implementation
Mode.It is all it is of the present utility model spirit and principle within, any modification, equivalent substitution and improvements done etc. should be included in
Within protection domain of the present utility model.
Claims (3)
1. a kind of phase of three-phase voltage protection circuit, it is characterised in that including sample circuit and protection circuit, wherein sampling electricity
Road includes：First exchange divider resistance, second exchange divider resistance, the 3rd exchange divider resistance, three-phase bridge rectifier circuit and
Filter capacitor C1；The protection circuit is included for pile defection and the single-chip microcomputer U1 for judging；
Wherein, the resistance of the first exchange divider resistance, the second exchange divider resistance and the 3rd exchange divider resistance is identical；
Three-phase bridge rectifier circuit is made up of three pairs of commutation diodes, and first pair of commutation diode includes the first commutation diode D1
With the 4th commutation diode D4, the positive pole of the first commutation diode D1 is connected with the negative pole of the 4th commutation diode D4；Second pair
Commutation diode includes the second commutation diode D2 and the 5th commutation diode D5, the positive pole and the 5th of the second commutation diode D2
The negative pole connection of commutation diode D5；3rd pair of commutation diode includes the 3rd commutation diode D3 and the 6th commutation diode
D6, the positive pole of the 3rd commutation diode D3 is connected with the negative pole of the 6th commutation diode D6；
The negative pole of the negative pole of the first commutation diode D1, the negative pole of the second commutation diode D2 and the 3rd commutation diode D3 is together
It is connected to one end of filter capacitor C1, the positive pole of the 4th commutation diode D4, the positive pole of the 5th commutation diode D5 and the 6th are whole
The positive pole of stream diode D6 is together connected to the other end of filter capacitor C1 and is grounded SGND；
First exchange divider resistance one end is connected to A phase voltages, and the other end is connected to the positive pole and the of the first commutation diode D1
The negative pole of four commutation diode D4；Second exchange divider resistance one end is connected to B phase voltages, and the other end is connected to the second rectification two
The negative pole of the positive pole of pole pipe D2 and the 5th commutation diode D5；3rd exchange divider resistance one end is connected to C phase voltages, the other end
It is connected to the positive pole of the 3rd commutation diode D3 and the negative pole of the 6th commutation diode D6；
Used as sampled point, the terminal voltage of filter capacitor C1 is used as sampled voltage Vad, there is provided to list for described one end of filter capacitor C1
Piece machine U1.
2. circuit according to claim 1, it is characterised in that the circuit also includes sampling resistor R10, the sampling electricity
Resistance R10 is connected in parallel on filter capacitor C1 two ends.
3. circuit according to claim 1, it is characterised in that the first exchange divider resistance is by three resistance R1, R4 and R7
Composition, the second exchange divider resistance is made up of three resistance R2, R5 and R8, and the 3rd exchange divider resistance is by three resistance R3, R6
Constituted with R9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621315523.6U CN206225989U (en) | 2016-12-02 | 2016-12-02 | Three-phase voltage open-phase protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621315523.6U CN206225989U (en) | 2016-12-02 | 2016-12-02 | Three-phase voltage open-phase protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206225989U true CN206225989U (en) | 2017-06-06 |
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ID=58785196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621315523.6U Active CN206225989U (en) | 2016-12-02 | 2016-12-02 | Three-phase voltage open-phase protection circuit |
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| Country | Link |
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| CN (1) | CN206225989U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643453A (en) * | 2017-10-20 | 2018-01-30 | 珠海格力电器股份有限公司 | Detection circuit |
| CN113328424A (en) * | 2021-06-04 | 2021-08-31 | 吴豪 | Intelligent electric shock prevention switch |
-
2016
- 2016-12-02 CN CN201621315523.6U patent/CN206225989U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643453A (en) * | 2017-10-20 | 2018-01-30 | 珠海格力电器股份有限公司 | Detection circuit |
| CN113328424A (en) * | 2021-06-04 | 2021-08-31 | 吴豪 | Intelligent electric shock prevention switch |
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