CN203788163U - Small-size output intrinsic safety power supply - Google Patents
Small-size output intrinsic safety power supply Download PDFInfo
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- CN203788163U CN203788163U CN201420101585.1U CN201420101585U CN203788163U CN 203788163 U CN203788163 U CN 203788163U CN 201420101585 U CN201420101585 U CN 201420101585U CN 203788163 U CN203788163 U CN 203788163U
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- circuit
- power supply
- circuit board
- output
- width modulation
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Abstract
The utility model discloses a small-size output intrinsic safety power supply. The power supply comprises a housing and a circuit board. The housing comprises an installation bottom plate used for installing the circuit board, and a plastic upper housing used for covering the circuit board and components. The circuit board successively comprises an AC input end, a filter circuit, a rectification circuit, a pulse width modulation circuit, a high-frequency transformer, a rectification voltage reduction circuit, an overcurrent protection circuit, an overvoltage protection circuit, a sampling circuit and a DC output end, wherein the above-mentioned parts are successively connected with each other. The overcurrent protection circuit is provided with a MOS tube. The sampling circuit is provided with three output ends, a power supply output end, a circuit feedback end and a voltage feedback end, which are respectively connected to the DC output end, the overcurrent protection circuit and the pulse width modulation circuit. An isolation circuit is disposed between the sampling circuit and the pulse width modulation circuit. The installation bottom plate is made of aluminum or aluminum alloy. The small-size output intrinsic safety power supply is small in size, light in weight, high in output efficiency, and convenient in installation and usage of mining equipment.
Description
Technical field
The utility model relates to electrical apparatus for explosive atmospheres and part field, is specifically related to a kind of small size output intrinsically safe power supply.
Background technology
In workplaces such as collieries, owing to having explosion hazard gas and steam, so need to use electrical apparatus for explosive atmospheres.And intrinsicallysafe electrical apparatus is by the various parameters of restriction electric equipment circuit, or take safeguard measure to come sparkover energy and the heat energy of limiting circuit, make its electric spark and thermal effect of under the malfunction of normal work and regulation, producing all can not light the explosive mixture of surrounding environment, thereby realize electrical explosion proof, thereby do not need special explosion-resistant enclosure, volume and weight that so just can reduction equipment, the structure of simplified apparatus, equipment is had safe and reliable, simple in structure, volume is little, lightweight, cost is low, manufacture the features such as easy to maintenance, it is a kind of more satisfactory electrical apparatus for explosive atmospheres.
All generally to use DC power supply at the electric equipment of the workplaces such as colliery, the one, for the purpose of safety, and the 2nd, the power supply that dry cell easy to use etc. carry.In the time that needs use external power supply, just need to use the power supply that interchange is changed into direct current, for safety, power supply is generally output intrinsically safe power supply, output intrinsically safe power supply is the same with intrinsicallysafe electrical apparatus, is also the principle based on same, is a kind of explosion-proof electrical source.
The output intrinsically safe power supply using at present, exists output capacity little, and efficiency is not high, and the shortcomings such as volume is large, Heavy Weight, for the very responsive mining equipment of volume and weight, exist and use and install the shortcoming being all a great inconvenience.
Therefore, designing the output intrinsically safe power supply that a kind of volume is little, lightweight, efficiency is high, facilitate installation and the use of mining equipment, is this area technical issues that need to address.
Utility model content
The technical problems to be solved in the utility model: design the output intrinsically safe power supply that a kind of volume is little, lightweight, efficiency is high, facilitate installation and the use of mining equipment.
For solving the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of small size output intrinsically safe power supply, comprises shell and circuit board; Described shell comprises the plastics upper cover of the mounting base of described circuit board being installed and described circuit board and components and parts thereof being covered; Described circuit board comprises the ac input end, filter circuit, rectification circuit, pulse-width modulation circuit, high frequency transformer, rectification reduction voltage circuit, current foldback circuit, overvoltage crowbar, sample circuit and the DC output end that connect successively; Described current foldback circuit is provided with metal-oxide-semiconductor; Described sample circuit is provided with three outputs that comprise power output end, current feedback terminal and pressure feedback port, is connected respectively with described DC output end, described current foldback circuit and described pulse-width modulation circuit; Between described sample circuit and described pulse-width modulation circuit, be also provided with buffer circuit; The material of described mounting base is aluminum or aluminum alloy.
Preferably, described current foldback circuit is double overcurrent protection circuit, and described overvoltage crowbar is dual overvoltage crowbar.
Preferably, resistance, electric capacity and the diode on described circuit board all adopts 0603 encapsulation.
Preferably, the material of described mounting base is fine aluminium.
Preferably, the material of described plastics upper cover is flame-proof ABS.
Pass through technique scheme, we provide a kind of small size output intrinsically safe power supply, by the improvement of four aspects, greatly reduce the volume of power supply: 1. mounting base adopts aluminum or aluminum alloy, be convenient to powerful components and parts heat radiation, and fin that need not be special has been saved the space of fin; 2. used metal-oxide-semiconductor current limliting, caloric value is less, can use less encapsulation, has saved volume; 3. whole circuit has adopted two kinds of feedbacks, automatically regulates and exchanges the input of end and the input of overcurrent protection end according to direct current output, makes the delivery efficiency of power supply higher, so can adopt the high performance components such as high frequency transformer that power is lower, has reduced volume; 4. the resistance on circuit board, electric capacity and diode all adopt 0603 encapsulation.Its beneficial effect is: volume is little, lightweight, delivery efficiency is high, facilitates installation and the use of mining equipment.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of the disclosed a kind of small size output intrinsically safe power supply of the utility model embodiment;
Fig. 2 is the upward view of Fig. 1;
Fig. 3 is the schematic diagram of the circuit structure of the circuit board of the disclosed a kind of small size output intrinsically safe power supply of the utility model embodiment.
Numeral and the represented corresponding component title of letter in figure:
11. plastics upper cover 12. mounting base 21. ac input end 22. filter circuit 23. rectification circuit 24. pulse-width modulation circuit 25. high frequency transformer 26. rectification reduction voltage circuit 27. current foldback circuit 28. overvoltage crowbar 29. sample circuit 210. DC output end 211. buffer circuits.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Principle of the present utility model is: by the improvement of four aspects, greatly reduced the volume of power supply: 1. mounting base adopts aluminum or aluminum alloy, is convenient to the heat radiation of powerful components and parts, and fin that need not be special, has saved the space of fin; 2. used metal-oxide-semiconductor current limliting, caloric value is less, can use less encapsulation, has saved volume; 3. whole circuit has adopted two kinds of feedbacks, automatically regulates and exchanges the input of end and the input of overcurrent protection end according to direct current output, makes the delivery efficiency of power supply higher, so can adopt the high performance components such as high frequency transformer that power is lower, has reduced volume; 4. the resistance on circuit board, electric capacity and diode all adopt 0603 encapsulation.
Embodiment:
As shown in Figure 1, Figure 2 and Figure 3, a kind of small size output intrinsically safe power supply, comprises shell and circuit board; The plastics upper cover 11 that shell comprises the mounting base 12 of mounting circuit boards and circuit board and components and parts thereof are covered; Circuit board comprises the ac input end 21, filter circuit 22, rectification circuit 23, pulse-width modulation circuit 24, high frequency transformer 25, rectification reduction voltage circuit 26, current foldback circuit 27, overvoltage crowbar 28, sample circuit 29 and the DC output end 210 that connect successively; Current foldback circuit is provided with metal-oxide-semiconductor; Sample circuit 29 is provided with three outputs that comprise power output end, current feedback terminal and pressure feedback port, is connected respectively with DC output end 210, current foldback circuit 27 and pulse-width modulation circuit 24; Between sample circuit 29 and pulse-width modulation circuit 24, be also provided with buffer circuit 211; The material of mounting base 12 is aluminum or aluminum alloy.
Because mounting base 12 is aluminum or aluminum alloy, so, can be directly powerful components and parts (needing radiating treatment) be directly attached to above mounting base, fin so just can be installed, saved a large amount of space (volume of fin is generally all larger).
Metal-oxide-semiconductor can do current limliting use, and compares common current limiting element as resistance, common transistor, diode etc., has working stability, very high input impedance, completes same function, and its volume is much smaller, has so just saved space.
Sample circuit 29 is provided with 2 feedback output ends; can be last output feedback (negative feedback) to the input of current foldback circuit 27 and the input of pulse-width modulation circuit 24; regulate and exchange the input voltage of end and the input current of overcurrent protection end; can reduce like this energy loss in current foldback circuit 27 and high frequency transformer 25; also just improved the delivery efficiency of power supply; in the present embodiment; the delivery efficiency of power supply can reach 90%, and this is very high in output intrinsically safe power supply.Just because of this, so can adopt the high performance components such as the high frequency transformer that power is lower, reduced the volume of whole power supply.
The effect of buffer circuit 211 is the magnitude of voltage of DC output end can be fed back to pulse-width modulation circuit 24, but can not allow again the alternating current of ac input end directly be transferred to DC output end 210, has ensured the safety of electricity consumption.
The concrete formation of above-mentioned filter circuit 22, rectification circuit 23, pulse-width modulation circuit 24, high frequency transformer 25, rectification reduction voltage circuit 26, current foldback circuit 27, overvoltage crowbar 28, sample circuit 29 and buffer circuit 211; there are some conventional methods; those skilled in the art can both understand, and have not been described further at this.
In the present embodiment, the voltage of ac input end is 127V～220V, and DC output end is 24V, and this is also the conventional requirement of the power supply of general mining equipment use.
In the present embodiment, current foldback circuit 27 is double overcurrent protection circuit, and overvoltage crowbar 28 is dual overvoltage crowbar, and the voltage and current of output is more stable like this.
In the present embodiment, resistance, electric capacity and diode on circuit board all adopt 0603 encapsulation, and the small volume of encapsulation, has saved space like this, makes the volume of power supply less.
In the present embodiment, the material of mounting base 12 is fine aluminium, and the performance of heat radiation is better like this.
In the present embodiment, the material of plastics upper cover 11 is flame-proof ABS.ABS is the very good material of a kind of combination property, existing good mechanical property, impact strength is fabulous, and anti-wear performance is good, can under a lot of environment, use again, oil resistance, thermal endurance, low temperature properties are good, and insulation property are better, in mining equipment, use, most suitable, and there is certain explosion-proof ability (although intrinsicallysafe electrical apparatus does not need explosion-proofly, work, have certain explosion-proof ability or good) under ore deposit.
In the above-described embodiments, we provide a kind of small size output intrinsically safe power supply, by the improvement of four aspects, greatly reduce the volume of power supply: 1. mounting base adopts aluminum or aluminum alloy, be convenient to powerful components and parts heat radiation, and fin that need not be special has been saved the space of fin; 2. used metal-oxide-semiconductor current limliting, caloric value is less, can use less encapsulation, has saved volume; 3. whole circuit has adopted two kinds of feedbacks, automatically regulates and exchanges the input of end and the input of overcurrent protection end according to direct current output, makes the delivery efficiency of power supply higher, so can adopt the high performance components such as high frequency transformer that power is lower, has reduced volume; 4. the resistance on circuit board, electric capacity and diode all adopt 0603 encapsulation.Its beneficial effect is: volume is little, lightweight, delivery efficiency is high, facilitates installation and the use of mining equipment.
Above-described is only preferred implementation of the present utility model; it should be pointed out that for the person of ordinary skill of the art, do not departing under the prerequisite of the utility model creation design; can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (5)
1. a small size output intrinsically safe power supply, is characterized in that, comprises shell and circuit board; Described shell comprises the plastics upper cover of the mounting base of described circuit board being installed and described circuit board and components and parts thereof being covered; Described circuit board comprises the ac input end, filter circuit, rectification circuit, pulse-width modulation circuit, high frequency transformer, rectification reduction voltage circuit, current foldback circuit, overvoltage crowbar, sample circuit and the DC output end that connect successively; Described current foldback circuit is provided with metal-oxide-semiconductor; Described sample circuit is provided with three outputs that comprise power output end, current feedback terminal and pressure feedback port, is connected respectively with described DC output end, described current foldback circuit and described pulse-width modulation circuit; Between described sample circuit and described pulse-width modulation circuit, be also provided with buffer circuit; The material of described mounting base is aluminum or aluminum alloy.
2. a kind of small size output intrinsically safe power supply according to claim 1, is characterized in that, described current foldback circuit is double overcurrent protection circuit, and described overvoltage crowbar is dual overvoltage crowbar.
3. a kind of small size output intrinsically safe power supply according to claim 1, is characterized in that, resistance, electric capacity and diode on described circuit board all adopt 0603 encapsulation.
4. a kind of small size output intrinsically safe power supply according to claim 1, is characterized in that, the material of described mounting base is fine aluminium.
5. according to a kind of small size output intrinsically safe power supply described in claim 1-4 any one, it is characterized in that, the material of described plastics upper cover is flame-proof ABS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420101585.1U CN203788163U (en) | 2014-03-07 | 2014-03-07 | Small-size output intrinsic safety power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420101585.1U CN203788163U (en) | 2014-03-07 | 2014-03-07 | Small-size output intrinsic safety power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203788163U true CN203788163U (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420101585.1U Expired - Fee Related CN203788163U (en) | 2014-03-07 | 2014-03-07 | Small-size output intrinsic safety power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203788163U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061179A (en) * | 2016-05-31 | 2016-10-26 | 宿州中矿三杰科技有限公司 | Downhole safety power supply device |
-
2014
- 2014-03-07 CN CN201420101585.1U patent/CN203788163U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061179A (en) * | 2016-05-31 | 2016-10-26 | 宿州中矿三杰科技有限公司 | Downhole safety power supply device |
| CN106061179B (en) * | 2016-05-31 | 2018-12-11 | 宿州中矿三杰科技有限公司 | A kind of mine safe power supply device |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20170307 |