CN204374310U - A kind of three-phase alternating-current supply lack detection circuit - Google Patents
A kind of three-phase alternating-current supply lack detection circuit Download PDFInfo
- Publication number
- CN204374310U CN204374310U CN201420849714.5U CN201420849714U CN204374310U CN 204374310 U CN204374310 U CN 204374310U CN 201420849714 U CN201420849714 U CN 201420849714U CN 204374310 U CN204374310 U CN 204374310U
- Authority
- CN
- China
- Prior art keywords
- pass filter
- circuit
- current supply
- phase alternating
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model provides a kind of three-phase alternating-current supply lack detection circuit, and every phase power supply signal of three-phase alternating-current supply exports successively after Hi-pass filter, low-pass filter and shaping circuit; Described shaping circuit is provided with power phase shortage check point; By the voltage magnitude of Hi-pass filter decay three-phase circuit, by resistance in series dividing potential drop evanescent voltage amplitude, by low-pass filter circuit filtering high frequency interference, by signal transformation circuit shaping output signal, be convenient to controller compatibility and identify.This circuit structure is simple, with low cost, reliable.
Description
Technical field
The utility model relates to a kind of power sense circuit, especially relates to a kind of three-phase alternating-current supply lack detection circuit.
Background technology
At present in the application of single phase alternating current power supply, the pile defection of three-phase alternating-current supply is necessary, can judge the fault of power supply fast, plays a protective role to other controls.A lot of open-phase detection protection circuit is all that cost compare is high by the element testing such as optocoupler or comparer open-phase protection at present, and power consumption may be also larger, thus affect reliability.
Utility model content
The utility model object is to provide a kind of simple and reliable three-phase alternating-current supply lack detection circuit, high to solve existing testing circuit cost, the problem that reliability is low.
For solving the problem, the utility model is realized by following scheme:
A kind of three-phase alternating-current supply lack detection circuit, comprises the Hi-pass filter, low-pass filter and the shaping circuit that connect successively; Every phase power supply signal of three-phase alternating-current supply exports successively after Hi-pass filter, low-pass filter and shaping circuit; Described shaping circuit is provided with power phase shortage check point.
Described Hi-pass filter is made up of the first electric capacity and the first resistant series.
Described Hi-pass filter by the first electric capacity and the array that is made up of at least two the first resistance in series.
The resistance that in the array that described low-pass filter is made up of the first resistance, voltage is minimum and the second Capacitance parallel connection are formed.
Described shaping circuit is made up of a two-way clamp diode and rc filter circuit.
Described power phase shortage check point is connected on the clamper point of two-way clamp diode.
Described rc filter circuit is connected to the clamper point of two-way clamp diode, for carrying out low-pass filtering to detection signal.
Compared with existing solution technique, the beneficial effect of this programme shows: by the voltage magnitude of Hi-pass filter decay three-phase circuit, reduce voltage magnitude, by low-pass filter circuit filtering high frequency interference, by signal transformation circuit shaping output signal, shaping circuit is provided with power phase shortage check point, is convenient to controller compatibility and identifies.This circuit structure is simple, with low cost, reliable.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present embodiment;
Fig. 2 is the circuit theory diagrams of the present embodiment scheme.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
For clearly demonstrating the technical scheme in the utility model, providing preferred embodiment below and being described with reference to the accompanying drawings.
See Fig. 1, be the structural representation of the present embodiment, comprise Hi-pass filter, low-pass filter, signal transformation circuit.Hi-pass filter be greater than supply frequency by frequency, effect is decaying power supplies signal, and multiple resistant series array can dividing potential drop decaying power supplies signal further, can improve voltage withstand capability simultaneously, prevent from puncturing, improve reliability.Low-pass filter adopts simple capacitance-resistance to design, and its cutoff frequency is higher than supply frequency, and further decaying power supplies signal, can filtering environmental interference and the high fdrequency component of power supply itself.Signal transformation circuit comprises clamping circuit and capacitance-resistance discharge and recharge filtering circuit.The effect of restricting signal level can be played by clamping circuit, avoid voltage to exceed the safe sampled voltage of processor, safe and reliable; Rc filter circuit does last filter shape to signal, is convenient to the sampling of processor.
See Fig. 2, be the circuit theory diagrams of the present embodiment scheme, left side A, B, C are three-phase alternating current input, and N is the negative terminal after three-phase alternating current electric rectification.For A phase (B phase, C facies principle is completely the same), electric capacity C1 and resistance R1, R2, R3, R4, R5 form Hi-pass filter, and its cutoff frequency is greater than supply frequency, and R1, the resistant series array that R2, R3, R4, R5 are formed is convenient to the voltage withstand capability improving circuit.C4, R5 form low-pass filter, and its cutoff frequency is greater than supply frequency, and carry out divider filter process to the signal that Hi-pass filter exports, can the high fdrequency component of electromagnetic interference (EMI) effectively in filtering environmental and power supply itself.B phase Hi-pass filter is by electric capacity C2 and resistance R6, and R7, R8, R9, R10 are formed, and C5, R10 form low-pass filter; C phase Hi-pass filter is by electric capacity C3 and resistance R11, and R12, R13, R14, R15 are formed, and C6, R15 form low-pass filter.
Shaping circuit is made up of two-way clamp diode D1, D2, D3 and rc filter circuit; three-phase alternating current is after low-pass filter; after the rc filter circuit of two-way clamp diode D1, D2, D3 (shielding) and rear end, generate pile defection signal LP1, LP2, LP3, rc filter circuit is made up of electric capacity C7, C8, C9 and the resistance in parallel with electric capacity C7, C8, C9.Rc filter circuit is connected to the clamper point 3 of two-way clamp diode.
For the device of setting forth in each embodiment of the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. a three-phase alternating-current supply lack detection circuit, is characterized in that, comprising: the Hi-pass filter connected successively, low-pass filter and shaping circuit; Every phase power supply signal of three-phase alternating-current supply exports successively after Hi-pass filter, low-pass filter and shaping circuit; Described shaping circuit is provided with power phase shortage check point.
2. three-phase alternating-current supply lack detection circuit according to claim 1, is characterized in that, described Hi-pass filter is made up of the first electric capacity and the first resistant series.
3. three-phase alternating-current supply lack detection circuit according to claim 1, is characterized in that, described Hi-pass filter by the first electric capacity and the array that is made up of at least two the first resistance in series.
4. three-phase alternating-current supply lack detection circuit according to claim 3, is characterized in that, the resistance that in the array that described low-pass filter is made up of the first resistance, voltage is minimum and the second Capacitance parallel connection are formed.
5. three-phase alternating-current supply lack detection circuit according to claim 1, is characterized in that, described shaping circuit is made up of a two-way clamp diode and rc filter circuit.
6. three-phase alternating-current supply lack detection circuit according to claim 5, is characterized in that, described power phase shortage check point is connected on the clamper point of two-way clamp diode.
7. three-phase alternating-current supply lack detection circuit according to claim 5, is characterized in that: described rc filter circuit is connected to the clamper point of two-way clamp diode, for carrying out low-pass filtering to detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849714.5U CN204374310U (en) | 2014-12-27 | 2014-12-27 | A kind of three-phase alternating-current supply lack detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849714.5U CN204374310U (en) | 2014-12-27 | 2014-12-27 | A kind of three-phase alternating-current supply lack detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204374310U true CN204374310U (en) | 2015-06-03 |
Family
ID=53330518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420849714.5U Expired - Fee Related CN204374310U (en) | 2014-12-27 | 2014-12-27 | A kind of three-phase alternating-current supply lack detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204374310U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866663A (en) * | 2021-09-28 | 2021-12-31 | 四川虹美智能科技有限公司 | Three-phase power supply detection method and device |
-
2014
- 2014-12-27 CN CN201420849714.5U patent/CN204374310U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866663A (en) * | 2021-09-28 | 2021-12-31 | 四川虹美智能科技有限公司 | Three-phase power supply detection method and device |
| CN113866663B (en) * | 2021-09-28 | 2023-06-27 | 四川虹美智能科技有限公司 | Three-phase power supply detection method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203572867U (en) | Input power supply power down detection circuit | |
| CN103197130B (en) | A kind of voltage zero-crossing point of power grid detection method and device | |
| CN103698600A (en) | Frequency measuring system for universal voltage input power frequency signal | |
| CN203204062U (en) | Comparator-based voltage signal detection circuit | |
| CN203225513U (en) | Comparison coupling circuit used for low voltage frequency converter under-voltage protection circuit | |
| CN205210195U (en) | Three -phase AC phase sequence detection circuit | |
| CN203941243U (en) | A kind of three-phase electric power open phase testing circuit | |
| CN202548267U (en) | Circuit for detecting live wire and zero wire | |
| CN204374310U (en) | A kind of three-phase alternating-current supply lack detection circuit | |
| CN201717794U (en) | Capacitor voltage reducing circuit using impedance input filter | |
| CN103969498A (en) | High-power high-frequency power supply output overvoltage detection circuit | |
| CN105656044B (en) | A method of the inhibition current harmonics based on Fast Fourier Transform | |
| CN202474856U (en) | Photovoltaic inverter system with direct-current false connection prevention function | |
| CN203851010U (en) | Isolation-type uninterrupted power supply mains supply detection circuit | |
| CN203444100U (en) | Detection tooling for single-phase intelligent electric meter | |
| CN202075339U (en) | Zero crossing detection circuit | |
| CN202870147U (en) | Non-isolated commercial power voltage detection circuit | |
| CN202854245U (en) | Temporary ground wire detection device for transformer substation | |
| CN205335635U (en) | High -voltage board area electric protection device | |
| CN203101495U (en) | A zero-crossing detecting circuit | |
| CN204214921U (en) | Anti-electricity-theft Domestic electric meter | |
| CN204287796U (en) | There is the expansion module of alternating voltage detection and output switch parameter function | |
| CN204065374U (en) | Novel inverter detection filter unit | |
| CN203455472U (en) | Detecting device capable of detecting both three-phase intelligent electric energy meter and III-type special transformer acquisition terminal | |
| CN204216586U (en) | The mains by harmonics data acquisition and procession device of intelligent drawout cubicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20201227 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |