CN204316077U - Single current sensor motor phase failure, overload, short-circuit protection - Google Patents
Single current sensor motor phase failure, overload, short-circuit protection Download PDFInfo
- Publication number
- CN204316077U CN204316077U CN201520022985.8U CN201520022985U CN204316077U CN 204316077 U CN204316077 U CN 204316077U CN 201520022985 U CN201520022985 U CN 201520022985U CN 204316077 U CN204316077 U CN 204316077U
- Authority
- CN
- China
- Prior art keywords
- phase
- current sensor
- overload
- short
- circuit
- 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
- Protection Of Generators And Motors (AREA)
Abstract
The utility model relates to a kind of single current sensor motor phase failure, overload, short-circuit protection; comprise U, V, W three-phase circuit; in any circuitry phase of U, V, W, be provided with current sensor, and all the other two-phases are connected with phase detecting circuit respectively with between this phase.The utility model single current sensor cooperation phase detecting circuit completes the defencive function to motor phase failure, overload, short circuit.
Description
Technical field
The utility model relates to a kind of circuit protection device, specifically discloses a kind of single current sensor motor phase failure, overload, short-circuit protection.
Background technology
At present, 2 current sensors are very general for motor overload, short-circuit protection, for detecting the phase current of motor 2 circuitry phase simultaneously, realize overcurrent protection function according to size of current.Use 3 current sensors, detect 3 phase currents simultaneously, then compare and judge it is the simplest method reaching this defencive function; Utilize single current sensor to complete motor overload, short circuit, phase failure protection function simultaneously, all do not realize.
Utility model content
Goal of the invention of the present utility model is: provide a kind of single current sensor that utilizes to coordinate phase detecting circuit to complete the device of motor phase failure, overload, short-circuit protection for overcoming the above problems.
The technical scheme that the utility model adopts is such:
A kind of single current sensor motor phase failure, overload, short-circuit protection, comprise U, V, W three-phase circuit, be provided with current sensor, and all the other two-phases be connected with phase detecting circuit respectively with between this phase in any circuitry phase of U, V, W.
Further, described phase detecting circuit comprises an optocoupler, a diode, two resistance, and single chip circuit.
In sum, owing to adopting technique scheme, the beneficial effects of the utility model are:
The utility model adopts single current sensor to coordinate phase detecting circuit to realize motor phase failure, overload, short-circuit protection, and structure is simple.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is phase detecting circuit structural representation described in the utility model;
Fig. 3 be motor normally with disconnected phase phase diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1; a kind of single current sensor motor phase failure, overload, short-circuit protection; comprise U, V, W three-phase circuit, in any circuitry phase of U, V, W, be provided with current sensor, this is in U phase and arranges current sensor CT1; and be connected phase detecting circuit P1 between all the other two-phase V phase with U phases; be connected phase detecting circuit P2 between W phase with U phase, described phase detecting circuit comprises an optocoupler, a diode; two resistance, and single chip circuit.
Principle:
Only with a current sensor CT1 detection U phase current, P1, P2 be 2 groups of phase detecting circuits as shown in Figure 2, be sinusoidal wave phase voltage between A, B, positive half cycle A higher than B, optocoupler U1 conducting, C point output low level; Negative half period A is lower than B, and optocoupler ends, and C point exports high level, and diode D1 provides negative half-cycle current path, and protection optocoupler diode can not reverse breakdown.So any phase of A, B phase disconnects, C point keeps high level, and the square wave not having 50Hz exports, and detects disconnected phase according to this.
Normal condition, P1, P2 have square wave to export, and phase difference 120 °, CT1 electric current as overload, short circuit foundation, for CPU according to inverse time lag rule judgment.P1 can judge the discontinuous phase of UV, and P2 can judge the discontinuous phase of VW.CT1 electric current is also through Zero-cross comparator shown in Fig. 2 simultaneously, gathers current phase.
When U phase motor phase failure, P1, P2 all have signal, and CT1 electric current is 0;
As shown in Figure 3, phase diagram when P1, P2, CT1 are normal, when V phase motor breaks, the phase place of CT1, as shown in CT1-2, becoming advanced P2 phase place by falling behind P2 phase place normally, judging that V phase is broken phase accordingly;
As shown in Figure 3, phase diagram when P1, P2, CT1 are normal, when W phase motor breaks, the phase place of CT1, as shown in CT1-1, becomes fall behind about 20 ° of P1 a little by falling behind about 90 ° of P1 normally, judge that W phase is broken phase accordingly.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (2)
1. a single current sensor motor phase failure, overload, short-circuit protection; comprise U, V, W three-phase circuit; it is characterized in that: in any circuitry phase of U, V, W, be provided with current sensor, and all the other two-phases are connected with phase detecting circuit respectively with between this phase.
2. a kind of single current sensor motor phase failure according to claim 1, overload, short-circuit protection, is characterized in that: described phase detecting circuit comprises two optocouplers, current-limiting resistance and two diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520022985.8U CN204316077U (en) | 2015-01-13 | 2015-01-13 | Single current sensor motor phase failure, overload, short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520022985.8U CN204316077U (en) | 2015-01-13 | 2015-01-13 | Single current sensor motor phase failure, overload, short-circuit protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204316077U true CN204316077U (en) | 2015-05-06 |
Family
ID=53138372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520022985.8U Expired - Fee Related CN204316077U (en) | 2015-01-13 | 2015-01-13 | Single current sensor motor phase failure, overload, short-circuit protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204316077U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864956A (en) * | 2020-07-30 | 2020-10-30 | 缙云叶普电子科技有限公司 | Fixed mounting base capable of detecting abnormal power failure of motor |
-
2015
- 2015-01-13 CN CN201520022985.8U patent/CN204316077U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864956A (en) * | 2020-07-30 | 2020-10-30 | 缙云叶普电子科技有限公司 | Fixed mounting base capable of detecting abnormal power failure of motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202275129U (en) | On/off detection circuit for relay of smart electricity meter | |
| CN202583311U (en) | Alternating current zero-crossing detection circuit | |
| CN105372480A (en) | Over voltage, under voltage and phase failure detection circuit for charging pile | |
| CN105281341B (en) | A kind of high-pressure thyristor switched capacitor device and operation/cutting method | |
| CN102707121B (en) | Voltage surge detection circuit | |
| CN101614795B (en) | Default-phase signal detection circuit for three-phase power | |
| CN103336165A (en) | Detection circuit for overcurrent of alternating current and direct current | |
| CN203204062U (en) | Comparator-based voltage signal detection circuit | |
| CN204316077U (en) | Single current sensor motor phase failure, overload, short-circuit protection | |
| CN204391741U (en) | Surge protection circuit | |
| CN203813421U (en) | Photovoltaic energy-storage inversion control integrated machine short-circuit and overload protecting circuit | |
| CN202167825U (en) | Three-phase overvoltage detection protective device | |
| CN203377584U (en) | Three-phase non-midline phase-lack, undervoltage and overvoltage protection circuit | |
| CN202405760U (en) | Over-current protection circuit of frequency converter | |
| CN203551649U (en) | Real-time detection circuit for over-current protection of frequency converter | |
| CN205506916U (en) | Zero cross detection circuit | |
| CN204832315U (en) | Two -way current detection circuit | |
| CN204666713U (en) | The detection of generator amature superpotential action and protection circuit | |
| CN204314413U (en) | A kind of cable short circuit detecting device | |
| CN204615365U (en) | A kind of permagnetic synchronous motor back electromotive force protective device | |
| CN204116442U (en) | A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter | |
| CN204290281U (en) | A kind of motor phase failure, overload, short-circuit protection | |
| CN207339234U (en) | A kind of contactor protective device and alternating-current charging pile | |
| CN205178929U (en) | Elevator PMSM's DTC control system based on DSP | |
| CN202305651U (en) | Detection circuit for zero-crossing signal in alternating-current motor speed-regulating device |
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: 20150506 Termination date: 20180113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |