CN103368139A - Transformer protection circuit - Google Patents
Transformer protection circuit Download PDFInfo
- Publication number
- CN103368139A CN103368139A CN2012100837765A CN201210083776A CN103368139A CN 103368139 A CN103368139 A CN 103368139A CN 2012100837765 A CN2012100837765 A CN 2012100837765A CN 201210083776 A CN201210083776 A CN 201210083776A CN 103368139 A CN103368139 A CN 103368139A
- Authority
- CN
- China
- Prior art keywords
- protection circuit
- transformer
- circuit
- power supply
- branch road
- 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.)
- Pending
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides a transformer protection circuit which is internally provided with L and N lines of a power supply and a transformer connected with the L and N lines of the power supply, wherein the L line of the power supply is connected with a self-recovery fuse, and the self-recovery fuse is connected with an input end of the transformer. The transformer protection circuit has the beneficial effects that: the self-recovery fuse instead of an original fusing fuse is adopted in the transformer protection circuit so that fuse burnout due to instantaneous over-current is avoided; and meanwhile, the self-recovery fuse is connected with the input end of the transformer in the transformer protection circuit so that the transformer protection circuit can not only protect back-end equipment, but also can protect the transformer when a momentary circuit fault occurs.
Description
Technical field
The present invention relates to a kind of tranformer protection circuit, relate in particular to a kind of tranformer protection circuit of protecting transformer by being provided with resettable fuse.
Background technology
Usually the protection of the input line of power circuit all adopts fuse wire to protect; although this mode has been protected product; brought facility for maintenance; but for the power-supply device under the unattended environment; when the circuit transient fault occurring, will cause blown fuse, thereby make equipment can not carry out work; the replacing that must the very important person carry out the scene this moment could solve this invisible maintenance cost that increased.
Simultaneously; it generally is the rear end that fuse is positioned over transformer in the existing power circuit; thereby when the circuit transient fault occurring; at first can then just can cause blown fuse so that transformer damages, therefore existing power circuit is in the protection rear end equipment; transformer is not protected; thereby in each circuit transient fault, when changing fuse, also need to change transformer, increased maintenance cost.
In view of this, be necessary existing power circuit is improved, to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of tranformer protection circuit, this tranformer protection circuit not only can be protected rear end equipment, can also protect transformer simultaneously.
For achieving the above object; a kind of tranformer protection circuit of the present invention; the transformer that is provided with power supply L, N circuit in the wherein said tranformer protection circuit and is connected with the output of described power supply L, N circuit; be connected with resettable fuse on the described power supply L circuit, and described resettable fuse is connected with the input of described transformer.
As a further improvement on the present invention, also be connected with a mains switch between described resettable fuse and the described transformer, can control the operating state of described tranformer protection circuit by closure and the disconnection of described mains switch.
As a further improvement on the present invention, be connected with the first branch road and the second branch road between described power supply L circuit and the described power supply N circuit, all be provided with fuse and thermistor on described the first branch road and the second branch road.
As a further improvement on the present invention, be outward extended with the 3rd branch road in described the first branch road and described the second branch road connection, be provided with variable capacitance on described the 3rd branch road.
As a further improvement on the present invention, include a jockey in the described tranformer protection circuit, the input of described power supply L, N circuit is connected with described jockey.
Compared with prior art, advantage of the present invention is: tranformer protection circuit of the present invention is replaced by resettable fuse with original fuse wire, thus avoided because of moment overcurrent cause the situation of blowout; Simultaneously, tranformer protection circuit of the present invention is connected resettable fuse with the input of transformer, so that when the circuit transient fault occurring, tranformer protection circuit of the present invention not only can be protected rear end equipment, can also protect transformer simultaneously.
Description of drawings
Fig. 1 is the circuit diagram of tranformer protection circuit of the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1; the transformer T1 that is provided with power supply L, N circuit (11,12) in a kind of tranformer protection circuit 100 of the present invention and is connected with the output of described power supply L, N circuit (11,12); be connected with resettable fuse P1 on the described power supply L circuit 11, and described resettable fuse P1 is connected with the input of described transformer T1.Also be connected with a mains switch SK between described resettable fuse P1 and the described transformer T1, can control the operating state of described tranformer protection circuit 100 by closure and the disconnection of described mains switch SK.Also include a jockey DZ1 in the described tranformer protection circuit 100; the input of described power supply L, N circuit (11,12) is connected with described jockey DZ1, thereby so that described power supply L, N circuit (11,12) can be connected with other equipment by described jockey DZ1.
Be connected with the first branch road 13 and the second branch road 15 between described power supply L circuit 11 and the described power supply N circuit 12, be outward extended with the 3rd branch road 14 in described the first branch road 13 with described the second branch road 15 connections.Be provided with thermistor RV2 and fuse F1 on described the first branch road 13, be provided with thermistor RV3 and fuse F2 on described the second branch road 15, be provided with variable capacitance FD2 on described the 3rd branch road 14.
As shown in Figure 1, the input of described transformer T1 and described power supply L, N circuit (11,12) output is connected, the output of described transformer T1 is connected with a bridge rectifier diode circuit D3, what be connected with described bridge rectifier diode circuit D3 also has some resistance (R1 ~ R3, R19), NPN type triode U2, some electric capacity (C1 ~ C7, C15), voltage stabilizing didoe TL1 and TL2 and a power supply voltage stabilizing chip U3, in the present embodiment, the model of described power supply voltage stabilizing chip U3 is 78L05, includes electrochemical capacitor (C1 in described some electric capacity, C2, C5, C6).
The operation principle of resettable fuse P1 is in the tranformer protection circuit 100 of the present invention: after mains switch SK closure, tranformer protection circuit 100 is started working, under the state of tranformer protection circuit 100 normal operations, resettable fuse P1 can normally, and resistance is very little, can not hinder passing through of electric current; But when the voltage of tranformer protection circuit 100 progressively raises; and the primary current that causes transformer T1 is when strengthening; if when flowing through the electric current of resettable fuse P1 and arriving greatly the threshold current of this resettable fuse P1; this resettable fuse P1 can become high-impedance state gradually; hinder passing through of electric current; thereby the safety of protective circuit; behind the transient voltage or electric current decline of tranformer protection circuit 100; resettable fuse P1 can become low resistive state from high-impedance state again, thereby guarantees the circuit normal operation.
In sum, tranformer protection circuit 100 of the present invention, by original fuse wire is replaced by resettable fuse P1, thus avoided because of moment overcurrent cause the situation of blowout; Simultaneously; tranformer protection circuit 100 of the present invention is connected resettable fuse P1 with the input of transformer T1; so that when the circuit transient fault occurring, tranformer protection circuit 100 of the present invention not only can be protected rear end equipment, can also protect transformer T1 simultaneously.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (5)
1. tranformer protection circuit; it is characterized in that: the transformer that is provided with power supply L, N circuit in the described tranformer protection circuit and is connected with the output of described power supply L, N circuit; be connected with resettable fuse on the described power supply L circuit, and described resettable fuse is connected with the input of described transformer.
2. tranformer protection circuit according to claim 1; it is characterized in that: also be connected with a mains switch between described resettable fuse and the described transformer, can control the operating state of described tranformer protection circuit by closure and the disconnection of described mains switch.
3. tranformer protection circuit according to claim 1 is characterized in that: be connected with the first branch road and the second branch road between described power supply L circuit and the described power supply N circuit, all be provided with fuse and thermistor on described the first branch road and the second branch road.
4. tranformer protection circuit according to claim 3 is characterized in that: be outward extended with the 3rd branch road in described the first branch road and described the second branch road connection, be provided with variable capacitance on described the 3rd branch road.
5. tranformer protection circuit according to claim 1, it is characterized in that: include a jockey in the described tranformer protection circuit, the input of described power supply L, N circuit is connected with described jockey.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100837765A CN103368139A (en) | 2012-03-27 | 2012-03-27 | Transformer protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100837765A CN103368139A (en) | 2012-03-27 | 2012-03-27 | Transformer protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103368139A true CN103368139A (en) | 2013-10-23 |
Family
ID=49368932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100837765A Pending CN103368139A (en) | 2012-03-27 | 2012-03-27 | Transformer protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103368139A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105470066A (en) * | 2016-01-08 | 2016-04-06 | 国网河南夏邑县供电公司 | Self-recovery type closing electromagnet |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997048159A1 (en) * | 1996-06-13 | 1997-12-18 | Abb Research Ltd. | Method of protecting a system or an installation from surge and voltage clamping circuit |
| CN101238535A (en) * | 2005-08-04 | 2008-08-06 | 泰科电子雷伊化学株式会社 | Electrical composite device |
| CN201196905Y (en) * | 2008-04-25 | 2009-02-18 | 刘义平 | Electric power transformer |
| CN102148500A (en) * | 2011-03-16 | 2011-08-10 | 深圳茂硕电源科技股份有限公司 | Unique lightning protection circuit of LED (light-emitting diode) power supply |
| CN102437562A (en) * | 2011-11-17 | 2012-05-02 | 溧阳杰敏电子有限公司 | Resettable fuse type overvoltage and overcurrent protection circuit |
-
2012
- 2012-03-27 CN CN2012100837765A patent/CN103368139A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997048159A1 (en) * | 1996-06-13 | 1997-12-18 | Abb Research Ltd. | Method of protecting a system or an installation from surge and voltage clamping circuit |
| CN101238535A (en) * | 2005-08-04 | 2008-08-06 | 泰科电子雷伊化学株式会社 | Electrical composite device |
| CN201196905Y (en) * | 2008-04-25 | 2009-02-18 | 刘义平 | Electric power transformer |
| CN102148500A (en) * | 2011-03-16 | 2011-08-10 | 深圳茂硕电源科技股份有限公司 | Unique lightning protection circuit of LED (light-emitting diode) power supply |
| CN102437562A (en) * | 2011-11-17 | 2012-05-02 | 溧阳杰敏电子有限公司 | Resettable fuse type overvoltage and overcurrent protection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105470066A (en) * | 2016-01-08 | 2016-04-06 | 国网河南夏邑县供电公司 | Self-recovery type closing electromagnet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9197056B2 (en) | Solid state power control system for aircraft high voltage DC power distribution | |
| CN102820638B (en) | Overcurrent protection device and electronic equipment | |
| CN102315630B (en) | Household cooking device | |
| CN104426128B (en) | Broken neutral line detects circuit and corresponding residual current circuit breaker | |
| CN103427392A (en) | Protective device for electric system | |
| CN204089152U (en) | A kind of Zener type intrinsic safety electric source overload protecting circuit | |
| CN105049017B (en) | A kind of solid-state relay with automatic breaking | |
| CN105794065A (en) | Robot control device and protective circuit | |
| CN103943396B (en) | Circuit breaker operation loop | |
| CN101582581B (en) | Electricity leakage-prevention and overcurrent protection device | |
| CN103366460A (en) | Circuit breaker for prepaid electric meter | |
| CN202013862U (en) | Fuse monitoring device | |
| CN202888955U (en) | Lightning protection and double-alternating-current power switching device | |
| CN202864606U (en) | Elevator electric system safety return circuit | |
| CN103368139A (en) | Transformer protection circuit | |
| CN217406185U (en) | Power protection circuit and power circuit | |
| CN203406776U (en) | DC power supply | |
| CN104953535A (en) | Breaking circuit and active type breaking protection device applying same | |
| CN202917939U (en) | Short circuit protection circuit | |
| JP5258633B2 (en) | AA circuit breaker with neutral wire phase loss protection | |
| CN204858515U (en) | Overcurrent protection circuit | |
| CN103532111A (en) | Incoming line and outgoing line protector of switching station | |
| CN203707798U (en) | Line-side soft start circuit of converter | |
| CN206293872U (en) | A kind of SPD back-up protection devices based on electromagnetic differential | |
| CN202134903U (en) | Electrical line short circuit current limit and protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131023 |