CN2768305Y - Noncontact motor starter circuit - Google Patents
Noncontact motor starter circuit Download PDFInfo
- Publication number
- CN2768305Y CN2768305Y CN 200520055006 CN200520055006U CN2768305Y CN 2768305 Y CN2768305 Y CN 2768305Y CN 200520055006 CN200520055006 CN 200520055006 CN 200520055006 U CN200520055006 U CN 200520055006U CN 2768305 Y CN2768305 Y CN 2768305Y
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- circuit
- limiting element
- current limiting
- electrically connected
- noncontact
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Abstract
The utility model relates to a noncontact motor starting circuit. The utility model is characterized in that the noncontact motor starting circuit comprises a PTC sheet, a bidirectional thyristor and a current limiting element, wherein one end of the PTC sheet and one end of the current limiting element are electrically connected with an alternating current circuit, and the other ends are respectively and electrically connected with an A2 pole and a G pole of the bidirectional thyristor; an A1 pole of the bidirectional thyristor is electrically connected with the alternating current circuit. The utility model has the advantages that the structure is simple, the components are few, the noncontact motor starting circuit has no contact, the influence caused by contact fire striking and electromagnetic interference is avoided, the conducting time is quick (within 10 milliseconds), the power consumption is saved by 70-80% as compared with the traditional motor starting switch circuit, and the reliability is greatly improved.
Description
Affiliated technical field
The utility model relates to motor starter circuit, especially the contactless electric machine starter circuit.
Background technology
Traditional electric motor starting diverter switch power consumption is big, noise is arranged, ON time is long, is easy to generate electric arc and switching overvoltage in the turn on process, especially when switching the large-current electric inductive load, the contact burnout phenomenon takes place easily, therefore usually adopt arc-extinguish chamber or, not only make the manufacturing process complexity, the cost height with measures such as vacuum, wet goods dielectrics, reliability is low, and the life-span lacks but also has the electromagnetic interference phenomenon.
Summary of the invention
In order to overcome the deficiency of existing diverter switch, the utility model provides a kind of contactless electric machine starter circuit, and this circuit not only ON time is fast, and is contactless, eliminates the influence that electromagnetic interference is brought, and low in energy consumption, reliability is high.
The technical scheme that its technical problem that solves the utility model adopts is: the contactless electric machine starter circuit, it is characterized in that: comprise PTC sheet and bidirectional triode thyristor and current limiting element, wherein an end of PTC sheet and current limiting element is electrically connected with ac circuit, the other end is electrically connected with the A2 utmost point and the G utmost point of bidirectional triode thyristor respectively, and the A1 utmost point of bidirectional triode thyristor is electrically connected with ac circuit.
PTC and current limiting element have positive temperature coefficient.
The beneficial effects of the utility model are that simple in structure, components and parts are few, contactless, avoided having the sparking of contact, the influence that electromagnetic interference is brought, ON time fast (in 10 milliseconds), and power consumption saves power consumption 70～80% than traditional diverter switch, and reliability significantly improves.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the circuit theory diagrams that are applied to the compressor for refrigeration starter of the present utility model.
Among the figure: T1 is a bidirectional triode thyristor, and RL is the PTC sheet, and RT is a current limiting element, and F1 is a protector, and L1 is a main winding, and L2 is an auxiliary winding.Among Fig. 2, be motor starter circuit in the frame of broken lines.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Consult Fig. 1, the contactless electric machine starter circuit, it is characterized in that: comprise PTC sheet and bidirectional triode thyristor and current limiting element, wherein an end of PTC sheet and current limiting element is electrically connected with ac circuit, the other end is electrically connected with the A2 utmost point and the G utmost point of bidirectional triode thyristor respectively, and the A1 utmost point of bidirectional triode thyristor is electrically connected with ac circuit.
PTC and current limiting element have positive temperature coefficient.
Operation principle of the present utility model is as follows: with this starter circuit incoming transport loop, when connecting dispatch from foreign news agency, can trigger bidirectional triode thyristor at short notice by current limiting element, because triggering signal is from major loop itself, triggering signal and major loop are synchronous fully on phase place, so can make bidirectional triode thyristor enter complete conducting state, this moment, starter circuit was operated in on-state.In a flash, the voltage that is added on the current limiting element is very high before major loop is switched on, and almost be the outer alternating voltage that inserts, but when controllable silicon one conducting, the voltage that is added on the current limiting element falls very lowly at once.Because string has a PTC sheet in the major loop, the PTC sheet has good ptc characteristics, major loop is in case electric current is flow through in connection, the PTC sheet will generate heat, its internal resistance increases immediately, the voltage that is added in the PTC sheet is also along with increase, and the voltage that is added in current limiting element is also followed increase, rises to applied voltage until voltage.In the process that voltage raises, the electric current that flows through in the current limiting element constantly increases, because current limiting element also has ptc characteristics, so its internal resistance also increases, and then the electric current that flows through current limiting element after voltage settles out begins rapid decline again after reaching a peak value, when electric current drops to the minimum trigger current of bidirectional triode thyristor when following, bidirectional triode thyristor ends, major loop also becomes off-state by conducting, and so far this starter circuit has just been finished one from reaching the course of work of pass.As long as applied voltage do not remove, bidirectional triode thyristor just is in cut-off state always, and major loop also just is in off-state, but removes when applied voltage, and PTC sheet and current limiting element all return under the normal temperature after the internal resistance, and starter circuit just can restart work.
Consult Fig. 2, the contactless electric machine starter circuit in freezer compressor as the application example of starter.In the contactless starter circuit, each components and parts model and major parameter are as follows:
Bidirectional triode thyristor: model is BTA12-600C, and on-state average current It=12A, repetitive peak reverse voltage VRRM are 600V, and gate trigger current IGT is 5～50mA;
PTC: diameter is φ 16, and internal resistance is 15 Ω under the normal temperature
Current limiting element: withstand voltage is 700V, and internal resistance is 4K under the normal temperature
Course of work summary:
It is as starter that the contactless electric machine starter circuit is applied in the freezer compressor, need insert auxiliary winding when just having powered on operation owing to compressor and start, and disconnects auxiliary winding again immediately and will move electric capacity after compressor is finished starting and put into operation.This starting circuit is in this example as starter, starting time short (PTC and the current limiting element of changing different parameters can be adjustable in 0.2～1 second), more energy-conservation, efficient than traditional single PTC starter, starting back energy consumption minimum (＜0.3W), and traditional starter energy consumption 〉=3W; Reduce 20% ~ 30% than traditional starter recovery time.
Above-described specific embodiment only is the utility model preferred embodiment, and the equivalent arrangements of being done according to the utility model claim all should be technology of the present utility model and contains such as.
Claims (2)
1. contactless electric machine starter circuit, it is characterized in that: comprise PTC sheet and bidirectional triode thyristor and current limiting element, wherein PTC sheet and current limiting element one end are electrically connected with ac circuit, and the other end is electrically connected with the A2 utmost point and the G utmost point of bidirectional triode thyristor respectively, and the A1 utmost point of bidirectional triode thyristor is electrically connected with ac circuit.
2. contactless electric machine starter circuit according to claim 1 is characterized in that: PTC and current limiting element all are to have positive temperature coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520055006 CN2768305Y (en) | 2005-02-25 | 2005-02-25 | Noncontact motor starter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520055006 CN2768305Y (en) | 2005-02-25 | 2005-02-25 | Noncontact motor starter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2768305Y true CN2768305Y (en) | 2006-03-29 |
Family
ID=36682174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520055006 Expired - Fee Related CN2768305Y (en) | 2005-02-25 | 2005-02-25 | Noncontact motor starter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2768305Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814874A (en) * | 2010-04-23 | 2010-08-25 | 常熟市天银机电有限公司 | Mutual-induction type contactless starter |
| CN101841284A (en) * | 2010-04-23 | 2010-09-22 | 常熟市天银机电有限公司 | Mutual inductance type non-contact starter |
-
2005
- 2005-02-25 CN CN 200520055006 patent/CN2768305Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814874A (en) * | 2010-04-23 | 2010-08-25 | 常熟市天银机电有限公司 | Mutual-induction type contactless starter |
| CN101841284A (en) * | 2010-04-23 | 2010-09-22 | 常熟市天银机电有限公司 | Mutual inductance type non-contact starter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060329 Termination date: 20120225 |