CN201838981U - High-sensitivity leakage current detection circuit breaker - Google Patents
High-sensitivity leakage current detection circuit breaker Download PDFInfo
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- CN201838981U CN201838981U CN2010205436512U CN201020543651U CN201838981U CN 201838981 U CN201838981 U CN 201838981U CN 2010205436512 U CN2010205436512 U CN 2010205436512U CN 201020543651 U CN201020543651 U CN 201020543651U CN 201838981 U CN201838981 U CN 201838981U
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- leakage current
- circuit breaker
- phase line
- center line
- thyristor
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Abstract
The utility model discloses a high-sensitivity leakage current detection circuit breaker which comprises a shielded wire, a leakage current detection unit and a disengaging mechanism, wherein a core wire of a phase wire and the core wire of a neutral wire of the shielded wire are respectively encircled in two conductive housing wires; the leakage current detection unit comprises a pair of rectifier diodes connected between the phase wire and the neutral wire of a power supply in series in reverse directions, a voltage dropping resistor, thyristors and an RC (resistance-capacitance) voltage dropping filter circuit; and the disengaging mechanism comprises control units which are controlled by the thyristors to be turned on/off, when any one in the thyristors is conducted, the corresponding control unit is conducted, and the disengaging mechanism can generate the action of cutting off a power supply. The leakage current detection circuit breaker is simple in structure and higher in precision, and can respectively detect leakage current of the phase wire and the neutral wire.
Description
Technical field
The utility model relates to a kind of leakage current and detects circuit breaker (LCDI), and especially a kind of leakage current simple in structure, that can detect phase line or center line electric leakage respectively detects circuit breaker.
Background technology
Leakage current detection circuit breaker is mounted in a kind of safety guard between power supply and the power consumption equipment, and it mainly comprises several sections: shielding conductor, leakage current detecting unit, tripping mechanism, and other circuit protection device.Existing leakage current detects circuit breaker generally need use integrated circuit.For example, CN 1988099B discloses a kind of leakage current detection breaker with the fire-proof shield line, as shown in Figure 1, it comprises a detection of electrical leakage unit, when the electric leakage accident occurring, induction coil detects the unsymmetrical current by phase line and center line, thereby disconnects the contact of the moving/fixed contact of tripping mechanism; Also comprise a fire prevention unit, it comprises the phase line that connects electrical network respectively and two rectifier cells of center line, the voltage drop element that is connected in series with two rectifier cells respectively and the fire prevention link of drawing from voltage drop element; Also comprise a fire-proof shield line, phase line wherein and center line heart yearn are connected the phase line and the middle line output terminal of leakage current detection breaker respectively, and are surrounded by a copper litz wire, and an end of this copper litz wire connects the fire prevention link of described fire prevention unit.When this copper litz wire contact phase line heart yearn and/or center line heart yearn, described fire prevention unit produces the separation of relative phase line and/or center line, causes the unsymmetrical current of phase line and center line of flowing through, thereby disconnects the contact of the moving/fixed contact of tripping mechanism.
Need to use the IC integrated chip in the technique scheme and come the signal of induction receiving coil and can be used to control tripping mechanism, make that the cost of whole leakage current detection breaker is higher through adjusting back output.Secondly, owing to use induction coil to detect leakage current, might can't detect the small leakage current in the circuit, thereby have potential safety hazard.
For overcoming above-mentioned defective, the utility model will propose a kind of new leakage current and detect circuit breaker.
Summary of the invention
The purpose of this utility model is to provide a kind of leakage current and the higher leakage current of precision simple in structure, that can detect phase line and center line respectively to detect circuit breaker.
For achieving the above object, high sensitivity leakage current of the present utility model detects circuit breaker and comprises shielding conductor, detection of electrical leakage unit and tripping mechanism, and wherein: the phase line heart yearn of described shielding conductor and center line heart yearn are enclosed in respectively in two conductive shell lines; Described detection of electrical leakage unit comprises rectifier diode, thyristor and dropping resistor, and two rectifier diodes oppositely are serially connected between phase line of power and the center line, and its anode links to each other, and negative electrode is connected with center line with phase line respectively; One end of dropping resistor is connected with the anode of rectifier diode, and the other end is connected with the shell line of shielding conductor respectively; The control utmost point of a pair of thyristor is connected with the negative electrode of rectifier diode respectively, and negative electrode is connected with center line with phase line respectively, and is parallel with RC step-down filter circuit between the negative electrode of thyristor and the control utmost point; Described tripping mechanism comprises the control unit of being controlled on/off respectively by described thyristor.
Wherein, described control unit can be solenoid, relay or optical coupled switch.
In embodiment of the present utility model, going back cross-over connection between the anode of phase line, center line and described thyristor respectively has two other reverse rectifier diode, utilizes the reverse cut-off characteristics of diode, and it can play and prevent that thyristor is reversed the effect of puncture.
In another embodiment of the present utility model, the control utmost point of described thyristor also is connected with current-limiting resistance respectively, described current-limiting resistance is serially connected in respectively between the electric capacity and resistance of RC step-down filter circuit, by adjusting the resistance of current-limiting resistance, can control the threshold value that thyristor is opened.
High sensitivity leakage current described in the utility model detects circuit breaker, and it also comprises indicating member, and described indicating member comprises light-emitting diode and the protective resistance thereof that is serially connected between phase line and the center line.
High sensitivity leakage current described in the utility model detects circuit breaker, and it also comprises test cell, and described test cell comprises test button and the protective resistance thereof that is connected between the phase line and the described dropping resistor other end.
The utlity model has following advantage:
1. replaced the integrated chip that uses in the prior art with simple electronic component, not only circuit structure is simple and reliable, and has reduced product cost.
2. adopt the circuit design of balance, have L mutually with N threshold value symmetry mutually, threshold value is provided with wide ranges (1uA-5mA is adjustable), threshold accuracy height, highly sensitive and continuously adjustable advantage.
3. two control unit structures of unit structure: by two groups of control units same magnetictrip is carried out disjunction control, use same contact mechanism, can protect phase line (L) externally and the external leakage current fault of zero line (N) respectively.
4. under the normal condition that electric leakage does not take place, the reverse blocking feature of utilization rectifier diode is isolated screen in the power supply private cable and is connected the user security when guaranteeing normally to use with power supply between the power line.
5. possesses anti-electromagnetic interference capability, the detection that can require EMC by UL and IEC (3C).
Description of drawings
Fig. 1 is the electrical block diagram of existing leakage current detection breaker;
Fig. 2 is the electrical block diagram that the utility model high sensitivity leakage current detects one of circuit breaker embodiment;
Fig. 3 is the electrical block diagram that the utility model high sensitivity leakage current detects the another embodiment of circuit breaker.
Embodiment
As shown in Figure 2, a kind of leakage current detection circuit breaker of the present utility model mainly comprises shielding conductor, detection of electrical leakage unit and tripping mechanism.Shielding conductor comprises phase line heart yearn and center line heart yearn, uses conductive shell line (circle on right side among the figure) to surround respectively, and the shell line can be other metal knitted lines that copper litz wire maybe can conduct electricity.One end of one end of phase line shell line and center line shell line is connected to the detection of electrical leakage unit by dropping resistor R3.
The detection of electrical leakage unit mainly also comprises rectifier diode D3, D4 except that comprising dropping resistor R3, thyristor SCR1, SCR2 and RC step-down filter circuit separately thereof.Wherein, the rectifier diode D3 and the D4 that are serially connected between power supply phase line and the center line oppositely are provided with, and link to each other with R3 after its anode links together, and negative electrode are connected with center line with phase line respectively, under normal circumstances can play the effect of isolating phase line and center line.The control utmost point of thyristor SCR1 links to each other with the negative electrode of rectifier diode D3, and negative electrode links to each other with phase line, the RC step-down filter circuit of being made up of parallel resistor R1 and capacitor C 1 between the negative electrode and the control utmost point.Equally, the control utmost point of thyristor SCR2 links to each other with the negative electrode of rectifier diode D4, and negative electrode links to each other with center line, the RC step-down filter circuit of being made up of parallel resistor R2 and capacitor C 2 between the negative electrode and the control utmost point.
Tripping mechanism comprises release and control unit.The K switch 1 and the K2 of release are connected in respectively on phase line and the center line, are used to cut off phase line or center line.K1 and K2 are the linked switches by same tripping mechanism control, by two control unit J1 and alternately control of J2.No matter be J1 or J2 conducting, K1, K2 are moved simultaneously, disconnect the power supply of center line and phase line.Wherein, control unit J1 or J2 can be that solenoid, relay or optical coupled switch and other have the like of identical function.J1 is connected between the anode of center line and thyristor SCR1, and J2 is connected between the anode of phase line and thyristor SCR2.Go back cross-over connection respectively between the anode of phase line and SCR2 and between the anode of center line and SCE1 rectifier diode D2 and the D1 reverse with thyristor are arranged.
At last; leakage current detects circuit breaker and also comprises by being connected the indicating member that LED between center line and the phase line and protective resistance R5 thereof constitute, and is connected the test cell that is made of test button Test and protective resistance R4 thereof between phase line and the shielding conductor shell line.
The operation principle of circuit breaker shown in Figure 2, with the phase line electric leakage is example: when phase line is leaked electricity, surround the shell tape of phase line heart yearn in the shielding conductor, be equivalent to conducting between phase line and the R3, leakage current triggers thyristor SCR2 through D4, thereby triggers the control unit J2 of tripping mechanism, impel the release action, K1 and K2 disconnect simultaneously, and power supply just is cut off, and light-emitting diode Led lamp goes out.
In like manner, if center line electric leakage, then surround the shell tape point of center line heart yearn in the shielding conductor, be equivalent to conducting between center line and the R3, leakage current triggers thyristor SCR1 through D3, thereby triggers the control unit J1 of tripping mechanism, impel the release action, K1 and K2 disconnect simultaneously, and power supply just is cut off, and light-emitting diode Led lamp goes out.
As shown in Figure 3, in the middle of another embodiment of the present utility model, the leakage current testing circuit also comprises current-limiting resistance R6 and R7 current-limiting resistance R6 between the RC of thyristor SCR1 step-down filter circuit R1 and C1, and is connected with the control utmost point of SCR1.Current-limiting resistance R7 and is connected with the control utmost point of SCR2 between the RC of thyristor SCR2 step-down filter circuit R1 and C1.
Claims (6)
1. a high sensitivity leakage current detects circuit breaker, comprises shielding conductor, detection of electrical leakage unit and tripping mechanism, it is characterized in that:
The phase line heart yearn of described shielding conductor and center line heart yearn are enclosed in respectively in two conductive shell lines;
Described detection of electrical leakage unit comprises:
The a pair of rectifier diode that oppositely is serially connected between power supply phase line and the center line, its anode links to each other, and negative electrode is connected with center line with phase line respectively;
Dropping resistor, the one end is connected with the anode of described rectifier diode, and the other end is connected with the shell line of described shielding conductor respectively;
A pair of thyristor, the control utmost point of described thyristor is connected with the negative electrode of described rectifier diode respectively, and negative electrode is connected with center line with phase line respectively, and be parallel with RC step-down filter circuit between the negative electrode and the control utmost point;
Described tripping mechanism comprises the control unit of being controlled on/off respectively by described thyristor.
2. high sensitivity leakage current as claimed in claim 1 detects circuit breaker, it is characterized in that, between phase line, center line and described thyristor, go back cross-over connection respectively reverse rectifier diode is arranged, the anode of described reverse rectifier diode is connected with the anode of thyristor respectively, and its negative electrode is connected with phase line, center line respectively.
3. high sensitivity leakage current as claimed in claim 2 detects circuit breaker, it is characterized in that also comprise: the control utmost point of described thyristor also is connected with current-limiting resistance respectively, and described current-limiting resistance is serially connected in respectively between the electric capacity and resistance of RC step-down filter circuit.
4. detect circuit breaker as claim 2 or 3 described high sensitivity leakage currents, it is characterized in that also comprise indicating member, described indicating member comprises light-emitting diode and the protective resistance thereof that is serially connected between phase line and the center line.
5. high sensitivity leakage current as claimed in claim 4 detects circuit breaker, it is characterized in that also comprise test cell, described test cell comprises test button and the protective resistance thereof that is connected between the phase line and the described dropping resistor other end.
6. high sensitivity leakage current as claimed in claim 1 detects circuit breaker, it is characterized in that described control unit is solenoid, relay or optical coupled switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205436512U CN201838981U (en) | 2010-09-27 | 2010-09-27 | High-sensitivity leakage current detection circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205436512U CN201838981U (en) | 2010-09-27 | 2010-09-27 | High-sensitivity leakage current detection circuit breaker |
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| Publication Number | Publication Date |
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| CN201838981U true CN201838981U (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205436512U Expired - Lifetime CN201838981U (en) | 2010-09-27 | 2010-09-27 | High-sensitivity leakage current detection circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420414A (en) * | 2010-09-27 | 2012-04-18 | 通领科技集团有限公司 | High-sensitivity leakage current detection circuit breaker |
-
2010
- 2010-09-27 CN CN2010205436512U patent/CN201838981U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420414A (en) * | 2010-09-27 | 2012-04-18 | 通领科技集团有限公司 | High-sensitivity leakage current detection circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI TONGLING ELECTRIC CO., LTD. Free format text: FORMER OWNER: TONGLING SCIENCE-TECHNOLOGY GROUP CORP. Effective date: 20130917 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 325600 WENZHOU, ZHEJIANG PROVINCE TO: 200000 HUANGPU, SHANGHAI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130917 Address after: 200000, room 700, 502 Yanan East Road, Shanghai, Huangpu District Patentee after: Shanghai Tongling Electrical Co., Ltd. Address before: 325600 No. seven, No. 222, weft Road, Yueqing Economic Development Zone, Zhejiang, China Patentee before: Zhejiang General Protecht Group Inc. |
|
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU TOLLEA TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SHANGHAI TONGLING ELECTRIC CO., LTD. Effective date: 20131112 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 200000 HUANGPU, SHANGHAI TO: 215400 SUZHOU, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131112 Address after: Dalian Dongrun Logistics Park A03b 215400 in Jiangsu Province, Taicang City Economic Development Zone Patentee after: General Protecht Group Inc. Address before: 200000, room 700, 502 Yanan East Road, Shanghai, Huangpu District Patentee before: Shanghai Tongling Electrical Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110518 |