CN102136790B - Intrinsic safe power provided with delayed spark energy release circuit - Google Patents
Intrinsic safe power provided with delayed spark energy release circuit Download PDFInfo
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- CN102136790B CN102136790B CN 201010257405 CN201010257405A CN102136790B CN 102136790 B CN102136790 B CN 102136790B CN 201010257405 CN201010257405 CN 201010257405 CN 201010257405 A CN201010257405 A CN 201010257405A CN 102136790 B CN102136790 B CN 102136790B
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Abstract
The invention provides an intrinsic safe power provided with a delayed spark energy release circuit, which comprises a direct-current power circuit and a safety barrier protection circuit, and also comprises a delayed spark energy release circuit connected between the direct-current power circuit and the safety barrier protection circuit, wherein the delayed spark energy release circuit adopts a LC (inductance-capacitance) circuit with an inductance-capacitance crossed network-topological structure , an input alternating-current power is connected into the direct-current power circuit, and the safety barrier protection circuit outputs intrinsic safe power. The intrinsic safe power provided with the delayed spark energy release circuit has the following advantages and active effects: the delayed spark energy release circuit is arranged and organically combined with the safety barrier protection circuit into a whole, so that the spark energy output by the circuit when in failure is reduced through matching of the energy releasing speed of the delayed energy release circuit and the actuating speed of the safety barrier protection circuit, and further the safety reliability and the output capacity of the intrinsic safe power can be further improved; and the circuit has simple structure and high reliability.
Description
Technical field
The present invention relates to supply unit, particularly a kind of intrinsic safety electric source with delayed spark energy release circuit.
Background technology
Intrinsically safe power supply plays vital effect for equipment such as the communication of using, monitoring, warning and hazard prediction and controls in the risk environments such as colliery, oil, chemical industry.Owing to using the energy-storage travelling wave tubes such as inductance, electric capacity in AC/DC, DC/DC DC power supply circuit, be short-circuited or during open circuit fault in output, be used for the inductance of output filtering, the energy that electric capacity is stored, to discharge at the utmost point electric spark of generation inflammable, the explosion hazard gases that may ignite in the short time by short circuit/open circuit fault point.Therefore, usually all increase the guard grating protective circuit at the intrinsic safety electric source output.The guard grating protective circuit adopts resistance current limliting, voltage-stabiliser tube or transistor pressure limiting, limits High Output Current and output voltage, to reach the purpose of restriction output energy.
No matter but adopt which kind of guard grating protective circuit, occur to the guard grating protection from power supply output short-circuit/open circuit fault and cut off energy output, always arranged certain time of delay.At present, optimizing the method that the guard grating protective circuit mainly adopts is:
1, select novel fast device in the guard grating protective circuit, limit energy to improve the error protection responsiveness;
2, adopt the components and parts such as voltage-stabiliser tube, transistor, metal-oxide-semiconductor, when the short circuit/generation overcurrent that opens circuit/overvoltage, output comes the limiting circuit spark energy by cutting off the electricity supply;
When 3, being short-circuited, by detecting electric current, increase the short circuit shunt circuit before output circuit, reach the shunting action of short circuit current, reduce the circuit spark energy.
Yet, in above-mentioned traditional method, for releasing of limiting circuit output can, it is mainly the operate time of taking to shorten how as far as possible safety barrier circuit, or with the measure of energy by other branch roads releases, and relate to by the structure of improving intrinsic safety electric source self do not limit self release can speed, therefore to release can be limited in restriction, can't adapt to the security reliability that improves intrinsic safety electric source and the requirement of output capacity.
Summary of the invention
The objective of the invention is to overcome defects; a kind of intrinsic safety electric source with delayed spark energy release circuit is provided; can match with the universal safety gate protection circuit; obviously reduce the fault spark energy; thereby increase security reliability and the output capacity of intrinsic safety electric source; circuit structure is simple, and reliability is high.
for achieving the above object, intrinsic safety electric source with delayed spark energy release circuit provided by the invention, comprise DC power supply circuit and guard grating protective circuit, also comprise the delayed spark energy release circuit that is connected between DC power supply circuit and guard grating protective circuit, input ac power access DC power supply circuit, guard grating protective circuit output intrinsic safety electric source, wherein, delayed spark energy release circuit adopts the lc circuit of inductance capacitance chiasma type network topology structure to consist of, lc circuit comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity, the first inductance one is terminated at the output of DC power supply circuit, the other end is connected to the input of guard grating protective circuit, the second inductance one is terminated at the ground terminal of DC power supply circuit, the other end is connected to the ground terminal of guard grating protective circuit, the first electric capacity one is terminated at the output of DC power supply circuit, the other end is connected to the ground terminal of guard grating protective circuit, the second electric capacity one is terminated at the ground terminal of DC power supply circuit, the other end is connected to the input of guard grating protective circuit.
The present invention has the intrinsic safety electric source of delayed spark energy release circuit; be 1 microsecond fault time of delay of wherein said guard grating protective circuit; correspondingly in lc circuit, the first inductance and the second inductance are respectively 1 microhenry, and the first electric capacity and the second electric capacity are respectively 1 microfarad.
The present invention has the intrinsic safety electric source of delayed spark energy release circuit, and wherein said DC power supply circuit is linear power supply or switching mode DC power supply, and its output voltage is 12V-24V, and output current is 0.5A-1.5A.
Advantage and good effect that the present invention has the intrinsic safety electric source of delayed spark energy release circuit are: owing to being provided with delayed spark energy release circuit; and organically be combined as a whole with the guard grating protective circuit; by delaying to release the coupling that the energy circuit is released energy speed and guard grating protective circuit responsiveness; circuit output spark energy when further having reduced fault; thereby also further improve security reliability and the output capacity of intrinsic safety electric source; circuit structure is simple, and reliability is high.
Be elaborated with reference to accompanying drawing below in conjunction with embodiment.
Description of drawings
Fig. 1 is the block diagram that the present invention has the intrinsic safety electric source of delayed spark energy release circuit;
Fig. 2 is the circuit theory diagrams of delayed spark energy release circuit;
Fig. 3 is short-circuit current, voltage, the instantaneous spark power figure when using delayed spark energy release circuit;
Fig. 4 is short-circuit current, voltage, the instantaneous spark power figure when not using delayed spark energy release circuit.
Embodiment
With reference to Fig. 1; the intrinsic safety electric source that the present invention has delayed spark energy release circuit is connected to form successively by DC power supply circuit 1, delayed spark energy release circuit 2, guard grating protective circuit 3; input ac power access DC power supply circuit 1, guard grating protective circuit 3 output intrinsic safety electric sources.
DC power supply circuit 1 in Fig. 1 can be the linear power supply in known technology, or Switching Power Supply.DC power supply circuit 1 output voltage is 12V-24V, and output current is 0.5A-1.5A.
Guard grating protective circuit 3 in Fig. 1 adopts known technologies, by components and parts such as various voltage-stabiliser tubes, transistor, metal-oxide-semiconductors, when short circuit/open circuit occurs, detects overcurrent/overvoltage.During short trouble by detecting the output current overcurrent, or when opening circuit by detecting the output voltage overvoltage, control guard grating protective circuit 3 output of cutting off the electricity supply.During short trouble, by detecting electric current, increase the short circuit shunt circuit before output circuit, reach the shunting action of short circuit current.
With reference to Fig. 2, provided a kind of physical circuit that the spark energy in the present invention delays release circuit 2.Spark energy delays release circuit 2 and adopts two inductance and two electric capacity, consists of the lc circuit of inductance capacitance chiasma type network topology structure.lc circuit comprises the first inductance L 1, the second inductance L 2, the first capacitor C 1 and the second capacitor C 2, the first inductance L 1 one is terminated at the output 21 of DC power supply circuit 1, the other end be connected to the input 21 of guard grating protective circuit 3 ', the second inductance L 2 one is terminated at the ground terminal 20 of DC power supply circuit 1, the other end be connected to the ground terminal 20 of guard grating protective circuit 3 ', the first capacitor C 1 one is terminated at the output 21 of DC power supply circuit 1, the other end be connected to the ground terminal 20 of guard grating protective circuit 3 ', the second capacitor C 2 one is terminated at the ground terminal 20 of DC power supply circuit 1, the other end be connected to the input 21 of guard grating protective circuit 3 '.
In order to coordinate for 3 operate times with the guard grating protective circuit, can realize the various electric releasable particular circuit configurations topological projects that delay by the LC span.Have in the embodiment of intrinsic safety electric source of delayed spark energy release circuit in the present invention; for 3 operate times of guard grating protective circuit be the protective circuit of 1 microsecond; the LC value that adopts correspondingly is specially: the first inductance L 1 and the second inductance L 2 are respectively 1 microhenry, and the first capacitor C 1 and the second capacitor C 2 are respectively 1 microfarad.
Describe the present invention in detail below in conjunction with accompanying drawing and have the operation principle of the intrinsic safety electric source of delayed spark energy release circuit.
Spark energy delays release circuit 2 and utilizes that inductive current can not suddenly change, capacitance voltage can not suddenly change, adopt the chiasma type network topology structure, at the power supply output short-circuit or when opening circuit, during on the one hand by inductance restriction short circuit, the capacitance current rapid growth, discharge thereby delay capacitive energy; The increase of inductive drop when opening circuit by capacitance limits on the other hand discharges thereby delay the open circuit fault energy.
When on the one hand two inductance of delayed spark energy release circuit 2 can effectively limit output short-circuit, electric capacity can speed to releasing of fault point, and when two electric capacity can effectively limit again output and open circuit on the other hand, inductance can speed to releasing of fault point.When power supply output is short-circuited or opens circuit, on the one hand by guard grating protective circuit 3 detection failure voltage or curent changes, control respective transistor or metal-oxide-semiconductor break-make, the output of cutting off the electricity supply; Simultaneously, before guard grating protective circuit 3 is cut off the electricity supply output, utilize prime energy delayed discharge circuit 2 growth rate of limiting short-circuit current or open circuit voltage effectively.Therefore; delayed spark energy release circuit 2 organically combines as a whole with guard grating protective circuit 3; by delay to release can circuit release can speed and guard grating protection speed be complementary, the output spark energy of circuit when further reducing fault, thus further improved the capacity of intrinsic safety electric source.
With reference to Fig. 3 and Fig. 4, be the delayed spark energy release circuit implementation result comparison diagram that the present invention relates to.
Wherein, when Fig. 3 delays to release energy circuit 2 scheme for spark energy in employing the present invention, the output current of intrinsic safety electric source short trouble, output voltage and short-circuit spark instantaneous power figure.Here establish guard grating protective circuit 3 and postponing to move and cut off output after 1 microsecond after the fault that is short-circuited; match with it; the first inductance L 1 and the second inductance L 2 are respectively 1 microhenry, and the first capacitor C 1 and the second capacitor C 2 are respectively 1 microfarad, and the short-circuit spark instantaneous power of gained as shown in the figure thus.Wherein curve 11 is voltage, curve 12 expression output currents, curve 13 expression short-circuit spark instantaneous powers.
Fig. 4 is when not adopting the scheme of delayed spark energy release circuit 2 of the present invention, the output current of intrinsic safety electric source short trouble, output voltage and short-circuit spark instantaneous power figure.Here suppose still that guard grating protective circuit 3 is postponing to move and cut off output after 1 microsecond after the fault that is short-circuited.Wherein curve 24 is voltage, curve 22 expression output currents, curve 23 expression short-circuit spark instantaneous powers.Can find out from Fig. 3 and Fig. 4; increase delayed spark energy release circuit 2 and can play the exergonic effect of fault that delays between DC power supply circuit 1 and guard grating protective circuit 3; match with universal safety gate protection circuit 3; can obviously reduce the fault spark energy; thereby increased the security reliability of intrinsic safety electric source; or under identical fault spark energy index request, can increase the output capacity of intrinsic safety electric source.
Embodiment recited above is described the preferred embodiment of the present invention; be not that the spirit and scope of the present invention are limited; do not breaking away under design prerequisite of the present invention; various modification and improvement that in this area, common engineers and technicians make technical scheme of the present invention; all should fall into protection scope of the present invention; the technology contents that the present invention asks for protection all is documented in claims.
Claims (2)
1. intrinsic safety electric source with delayed spark energy release circuit, comprise DC power supply circuit (1) and guard grating protective circuit (3), it is characterized in that: also comprise the delayed spark energy release circuit (2) that is connected between described DC power supply circuit (1) and guard grating protective circuit (3), input ac power access described DC power supply circuit (1), described guard grating protective circuit (3) output intrinsic safety electric source, wherein, described delayed spark energy release circuit (2) adopts the lc circuit of inductance capacitance chiasma type network topology structure to consist of, described lc circuit comprises the first inductance (L1), the second inductance (L2), the first electric capacity (C1) and the second electric capacity (C2), described the first inductance (L1) one is terminated at the output (21) of described DC power supply circuit (1), the other end is connected to the input (21 ＇) of described guard grating protective circuit (3), described the second inductance (L2) one is terminated at the ground terminal (20) of described DC power supply circuit (1), the other end is connected to the ground terminal (20 ＇) of described guard grating protective circuit (3), described the first electric capacity (C1) one is terminated at the output (21) of described DC power supply circuit (1), the other end is connected to the ground terminal (20 ＇) of described guard grating protective circuit (3), described the second electric capacity (C2) one is terminated at the ground terminal (20) of described DC power supply circuit (1), the other end is connected to the input (21 ＇) of described guard grating protective circuit (3), be 1 microsecond fault time of delay of described guard grating protective circuit (3), and correspondingly in described lc circuit, the first inductance (L1) and the second inductance (L2) are respectively 1 microhenry, and described the first electric capacity (C1) and the second electric capacity (C2) are respectively 1 microfarad.
2. the intrinsic safety electric source with delayed spark energy release circuit according to claim 1, it is characterized in that: wherein said DC power supply circuit (1) is linear power supply or switching mode DC power supply, its output voltage is 12V-24V, and output current is 0.5A-1.5A.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010257405 CN102136790B (en) | 2010-08-19 | 2010-08-19 | Intrinsic safe power provided with delayed spark energy release circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010257405 CN102136790B (en) | 2010-08-19 | 2010-08-19 | Intrinsic safe power provided with delayed spark energy release circuit |
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| CN102136790A CN102136790A (en) | 2011-07-27 |
| CN102136790B true CN102136790B (en) | 2013-05-15 |
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| CN 201010257405 Expired - Fee Related CN102136790B (en) | 2010-08-19 | 2010-08-19 | Intrinsic safe power provided with delayed spark energy release circuit |
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| CN102386761A (en) * | 2011-11-03 | 2012-03-21 | 中国矿业大学(北京) | Intrinsic safety output quasi-Z-source switching converter |
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| DE1285608B (en) * | 1964-08-17 | 1968-12-19 | Licentia Gmbh | Arrangement to limit overcurrents |
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Non-Patent Citations (4)
| Title |
|---|
| Z源变换器;彭方正等;《电工技术学报》;20040229(第2期);47-51 * |
| 刘树林.本质安全开关变换器基础理论及关键技术研究.《中国博士学位论文全文数据库 工程科技Ⅱ辑》.2008,(第 12 期),C042-16. |
| 彭方正等.Z源变换器.《电工技术学报》.2004,(第2期),47-51. |
| 本质安全开关变换器基础理论及关键技术研究;刘树林;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20081215(第 12 期);C042-16 * |
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Effective date of registration: 20180808 Address after: 301718 No. 2, northwestern side of Wu Ching road and Xiao Wang Cun road intersection in Huang Zhuang Street, Wuqing District, Tianjin Patentee after: Tianjin top Parr electric automation equipment Co. Address before: 100083 Beijing City, Haidian District Institute of Rutosids No. 11 Co-patentee before: Wang Cong Patentee before: Cheng Hong Co-patentee before: Lu Qiwei Co-patentee before: Zou Jia |
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