CN202840474U - Leakage protective circuit - Google Patents
Leakage protective circuit Download PDFInfo
- Publication number
- CN202840474U CN202840474U CN 201220555826 CN201220555826U CN202840474U CN 202840474 U CN202840474 U CN 202840474U CN 201220555826 CN201220555826 CN 201220555826 CN 201220555826 U CN201220555826 U CN 201220555826U CN 202840474 U CN202840474 U CN 202840474U
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- China
- Prior art keywords
- control chip
- circuit
- induction coil
- leakage
- thyristor
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- 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
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Abstract
The utility model provides a leakage protective circuit. The leakage protective circuit comprises an induction coil, a control chip, a trip coil and a thyristor, the induction coil is used for detecting leakage current, the trip coil can be matched with a mechanical structure to enable a main circuit breaker to be disconnected, the thyristor controls on and off of a trip coil power supply circuit, two ends of the induction coil are connected with two input pins of the control chip respectively through a filter circuit, an output pin of the control chip is connected with a control end of the thyristor through a protective resistor, an anode of the thyristor is connected with a live wire end of a power input wire through a diode and the trip circuit, and a cathode of the thyristor is connected with one end of the induction coil through a capacitor. The leakage protective circuit has leakage protection, ground terminal voltage protection and reverse connection wire protection functions, and is safe and reliable to use, simple in circuit structure, wide in application range and low in manufacture and production costs.
Description
Technical field
The utility model belongs to the earth leakage protective field, is specifically related to a kind of leakage protection circuit.
Background technology
Leakage protection circuit mainly is when the grid power leakage electric current surpasses set point, can automatic shutdown circuit or send the function of signal.Perhaps drive the disconnections such as breaker apparatus, with protective circuit.But the structure of present leakage protection circuit adopts miniature relay control, and product is inapplicable in the occasion that mechanical oscillation are arranged, and production cost is higher.
The utility model content
The utility model provides leakage protection circuit a kind of simple in structure, applied widely for above-mentioned the deficiencies in the prior art.
The utility model is achieved by the following technical solution:
A kind of leakage protection circuit; comprise that but induction coil, control chip cooperative mechanical structure for detection of leakage current make the tripping coil of major loop switch disconnection and the controllable silicon of control tripping coil current supply circuit break-make; the two ends of induction coil link to each other with two input pins of control chip by filter circuit respectively; the output pin of control chip links to each other with the silicon controlled control end by protective resistance; the silicon controlled anode links to each other with the live wire end of power input line by diode, tripping coil, and the silicon controlled negative electrode links to each other with an end of induction coil by electric capacity.
Further, two energization pins of control chip link to each other with two pins of a rectifier bridge respectively, and two other pin of described rectifier bridge links to each other with zero line side with the live wire end of power input line respectively.
Further, described control chip is chip VG54123.
The beneficial effects of the utility model are, can be used with the electric leakage product, when leakage protection circuit action described in the utility model, can drive other electric leakage product open-circuit line power supplys.The leakage current of this leakage protection circuit is 7.5mA～9.0mA; When the voltage of ground terminal PE during greater than 34 ± 2V, tripping coil L2 also can move at once, open-circuit line; In the situation of access PE, when power input line L, the access of N mistake, tripping coil L2 also can move at once, open-circuit line; Have earth leakage protective and backing protection function, safe and reliable, circuit structure is simple, manufacturing and production cost are lower.
Description of drawings
Fig. 1 is the circuit theory diagrams of leakage protection circuit described in the utility model.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1; the utility model provides a kind of leakage protection circuit; comprise the induction coil L1 for detection of leakage current; control chip U1; but the cooperative mechanical structure makes major loop switch J1 the tripping coil L2 that disconnects and the controllable silicon VS that controls tripping coil current supply circuit break-make; the two ends of induction coil L1 link to each other with two input pins (1 pin and 2 pin) of control chip U1 by filter circuit respectively; the output pin of control chip U1 (7 pin) links to each other with the control end of controllable silicon VS by protective resistance R3; the anode of controllable silicon VS is by diode VD; tripping coil L2 links to each other with the live wire end L of power input line, and the negative electrode of controllable silicon VS links to each other with the end of induction coil L1 by electric capacity.The supply power mode of control chip U1 can for: two energization pins (3 pin and 8 pin) link to each other with two pins of a rectifier bridge respectively, and two other pin of described rectifier bridge links to each other with zero line side N with the live wire end L of power input line respectively.Control chip U1 in the present embodiment is chip VG54123, can certainly adopt the earth leakage protective chip of other types.
The utility model not only is confined to above-mentioned embodiment; persons skilled in the art are according to the disclosed content of the utility model; can adopt other multiple embodiment to implement the utility model; therefore; every employing project organization of the present utility model and thinking; do some simple designs that change or change, all fall into the scope of the utility model protection.
Claims (3)
1. leakage protection circuit; it is characterized in that; comprise the induction coil L1 for detection of leakage current; control chip U1; but the cooperative mechanical structure makes major loop switch J1 the tripping coil L2 that disconnects and the controllable silicon VS that controls tripping coil current supply circuit break-make; the two ends of induction coil L1 link to each other with two input pins of control chip U1 by filter circuit respectively; the output pin of control chip U1 links to each other with the control end of controllable silicon VS by protective resistance R3; the anode of controllable silicon VS is by diode VD; tripping coil L2 links to each other with the live wire end L of power input line, and the negative electrode of controllable silicon VS links to each other with the end of induction coil L1 by electric capacity.
2. leakage protection circuit according to claim 1; it is characterized in that; two energization pins of control chip U1 link to each other with two pins of a rectifier bridge respectively, and two other pin of described rectifier bridge links to each other with zero line side N with the live wire end L of power input line respectively.
3. leakage protection circuit according to claim 1 is characterized in that, described control chip U1 is chip VG54123.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220555826 CN202840474U (en) | 2012-10-25 | 2012-10-25 | Leakage protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220555826 CN202840474U (en) | 2012-10-25 | 2012-10-25 | Leakage protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202840474U true CN202840474U (en) | 2013-03-27 |
Family
ID=47952090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220555826 Expired - Fee Related CN202840474U (en) | 2012-10-25 | 2012-10-25 | Leakage protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202840474U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887764A (en) * | 2014-03-25 | 2014-06-25 | 温州市万盛电器有限公司 | Electric leakage detection and protection circuit integrating regular self-inspection and reversed wiring protection functions |
-
2012
- 2012-10-25 CN CN 201220555826 patent/CN202840474U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887764A (en) * | 2014-03-25 | 2014-06-25 | 温州市万盛电器有限公司 | Electric leakage detection and protection circuit integrating regular self-inspection and reversed wiring protection functions |
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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: 20130327 Termination date: 20141025 |
|
| EXPY | Termination of patent right or utility model |