CN201699599U - Intrinsic-intrinsic-safety power supply with high output power - Google Patents
Intrinsic-intrinsic-safety power supply with high output power Download PDFInfo
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- CN201699599U CN201699599U CN201020294070XU CN201020294070U CN201699599U CN 201699599 U CN201699599 U CN 201699599U CN 201020294070X U CN201020294070X U CN 201020294070XU CN 201020294070 U CN201020294070 U CN 201020294070U CN 201699599 U CN201699599 U CN 201699599U
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Abstract
The utility model provides an intrinsic-intrinsic-safety power supply with high output power, which comprises a direct-current transfer circuit and a constant-current circuit, and at least two sets of overvoltage protection circuits, overcurrent protection circuits, over-load slow protection circuits, overload rapid protection circuits and restore circuits with the same structure. The input power supply is connected with the direct-current transfer circuit; an intrinsic-intrinsic-safety power supply is connected to an intrinsic-intrinsic-safety output end in a loading way; and the output voltage of the direct-current transfer circuit is of 18.5 V, the output current is of 1.5 A, and the output power is equal to or more than 30 W. The advantages and the benefits of the intrinsic-intrinsic-safety power supply with high output power are as follows: when the spark discharge generated by short-circuit and touch and the load reach a certain degree, the circuit can be rapidly detected and protected, meanwhile, the power output of the circuit is cut off, and the spark is rapidly eliminated. The intrinsic-intrinsic-safety power supply with high output power meets requirements of GB3836.4; constant-current work is applied to driving an LED lamp; after the abnormal-state is eliminated, the circuit can automatically remove the protection to restore normal work; the circuit structure is simple and the cost is low.
Description
Technical field
The utility model relates to supply unit, particularly a kind of intrinsically safe power supply of high-output power.
Background technology
Intrinsically safe power supply various intrinsic safety type equipment in hazardous environments such as colliery, oil, chemical industry use.So-called essential safe type is a kind of of type of explosion proof construc tion, by GB GB3836.4 standard.The design of essential safe type circuit, the energy limited of the electric spark that produces during exactly the circuit position short circuit of load or regulation within the specific limits.Except that must meeting the GB3836.4 standard-required, the intrinsically safe circuit spark ignition experiment that also must be undertaken by the explosion-proof test testing agency of national appointment.
The peak power output of present domestic essential safety power supply is generally about 18W.The traditional design technology is conceived to the restriction of output power of circuit, also is about to the restricting circuits output current meets the intrinsic safety performance as circuit main means.Use in the colliery etc. the 18V intrinsic safety electric source the most extensive by explosion-proof occasion, and with regard to this power supply, early eighties belongs under the joint efforts of a plurality of research institutions former coal subordinate, the about 700mA of High Output Current of the circuit that designs.Through technical staff's unremitting effort for many years, highest level can reach 1.0A at present, also is about 18W.This has formed the bottleneck of the peak power output of present intrinsic safety electric source (during the 18V left and right sides), can not break through this power bottleneck, then can't adapt to equipment to improving the requirement of intrinsic safety electric source output capacity.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned defective, and a kind of intrinsically safe power supply of high-output power is provided, and power output is not less than 30W, can obviously reduce the fault spark energy, and circuit structure is simple, and is with low cost.
For achieving the above object; the intrinsically safe power supply of the high-output power that the utility model provides; comprise DC transfer circuit, overvoltage crowbar, current foldback circuit and the load of intrinsic safety output; input ac power inserts described DC transfer circuit; insert intrinsic safety electric source to described intrinsic safety output load; also comprise the slow protective circuit of heavy duty, the fast protective circuit of heavy duty, constant-current circuit and restore circuit, wherein:
The slow protective circuit of described heavy duty comprises adjusts pipe, the slow switch triode of PNP, the 3rd resistance and NPN triode, the emitter of described NPN triode links to each other with the drain electrode of described adjustment pipe, the collector electrode of described NPN triode links to each other with the grid of described adjustment pipe, the base stage of described NPN triode links to each other through the collector electrode of described the 3rd resistance with the slow switch triode of described PNP, the delay capacitor of the mutual forward series connection of emitter warp of the slow switch triode of described PNP and the 18.5V output line that diode is connected to described DC transfer circuit, the base stage of the slow switch triode of described PNP inserts 13VZ voltage;
Described constant-current circuit adopts constant current tube to constitute, and the positive pole of described constant current tube is connected to the 18.5V output line of described DC transfer circuit, and the negative pole of described constant current tube is connected to the 0V output line of described DC transfer circuit;
The fast protective circuit of described heavy duty comprises adjusts pipe, the fast switch triode of PNP, the 3rd resistance, NPN triode, described delay capacitor and diode, the emitter of the fast switch triode of described PNP links to each other with the emitter of the slow switch triode of described PNP, the collector electrode of the fast switch triode of described PNP links to each other with the collector electrode of the slow switch triode of described PNP, and the base stage of the fast switch triode of described PNP is connected to the tie point of described delay capacitor and described diode;
Described restore circuit comprises the PNP reset transistor, the collector electrode of described PNP reset transistor links to each other with the positive pole of described delay capacitor, the emitter of described PNP reset transistor links to each other with the negative pole of described delay capacitor, the base stage of described PNP reset transistor links to each other with the emitter of the fast switch triode of described PNP, links to each other with the tie point of described constant-current circuit with the load of described intrinsic safety output simultaneously.
The intrinsically safe power supply of the utility model high-output power; wherein said overvoltage crowbar comprises controllable silicon, voltage-stabiliser tube and first resistance; described silicon controlled positive pole is connected to the 18.5V output line of described DC transfer circuit; described silicon controlled negative pole is connected to the 0V output line of described DC transfer circuit; the positive pole of described voltage-stabiliser tube is connected to the 18.5V output line of described DC transfer circuit; the negative pole of described voltage-stabiliser tube is connected to the described silicon controlled control utmost point, and described first resistance is connected between the 0V output line of the described silicon controlled control utmost point and described DC transfer circuit.
The intrinsically safe power supply of the utility model high-output power; wherein said current foldback circuit comprises sample resistance; compare amplifying circuit; second resistance and adjustment pipe; described sample resistance and the series connection of described adjustment pipe are to the loop of described intrinsic safety output load; the described relatively positive input of amplifying circuit is connected to the hot end of described sample resistance; the described relatively negative input of amplifying circuit is connected to the cold end of described sample resistance; the output of described relatively amplifying circuit is connected to the grid of described adjustment pipe, and described second resistance is connected between the grid of the 18.5V output line of described DC transfer circuit and described adjustment pipe.
The intrinsically safe power supply of the utility model high-output power, wherein said overvoltage crowbar, current foldback circuit, the slow protective circuit of heavy duty, the fast protective circuit of heavy duty, constant-current circuit and restore circuit are provided with 2 covers respectively at least, and the structure of another overvoltage crowbar is identical with described overvoltage crowbar; The structure of another current foldback circuit is identical with described current foldback circuit; The structure of the slow protective circuit of another heavy duty is identical with the slow protective circuit of described heavy duty; The structure of the fast protective circuit of another heavy duty is identical with the fast protective circuit of described heavy duty; The structure of another recondition circuit is identical with described restore circuit.
The intrinsically safe power supply of the utility model high-output power, the constant current value of wherein said constant current tube are 15mA.
The intrinsically safe power supply of the utility model high-output power, wherein said DC transfer circuit input voltage is 127V, and output voltage is 18.5V, and output current is 1.5A.
The advantage and the good effect of the intrinsically safe power supply of the utility model high-output power are: owing to be provided with the slow protective circuit of heavy duty, the fast protective circuit of heavy duty, constant-current circuit and restore circuit; can obviously reduce the fault spark energy; to short circuit, the sparkover that produces such as touch or when load is heavily arrived to a certain degree; circuit can fast detecting, protection fast; the output of cut-out circuit power, arc control fast.This device meets the requirement of GB3836.4; constant current work; be convenient to be applied to the driving of LED illuminating lamp; and after abnormal condition was eliminated, circuit can automatically terminate protection, recovered operate as normal; a kind of intrinsically safe power supply of high-output power is provided; power output is not less than 30W, and circuit structure is simple, and is with low cost.
Further be provided with overvoltage crowbar, current foldback circuit, circuit is exported spark energy when also having reduced fault, thereby further improves the output capacity of intrinsic safety electric source, and circuit structure is simple, and cost is also cheap.
Be elaborated with reference to accompanying drawing below in conjunction with embodiment.
Description of drawings
Fig. 1 is the circuit theory diagrams of the intrinsically safe power supply of the utility model high-output power.
Embodiment
Basically, the electric spark energy that produces when short circuit of power circuit depends on 2 points: the power output of circuit and the time of its effect.So the design of essential safe type circuit is exactly in restricting circuits power output and reduce to open the break-through point on the sparkover duration.Adaptation equipment for example, makes the peak power output of essential safety power supply reach 30W to improving the requirement of intrinsic safety electric source output capacity, can only be conceived to limit second factor of spark energy, the action time of promptly limiting spark.
With reference to Fig. 1; the intrinsically safe power supply of the utility model high-output power is made up of DC transfer circuit 10, overvoltage crowbar 11, current foldback circuit 12, the slow protective circuit 13 of heavy duty, the fast protective circuit 14 of heavy duty, restore circuit 15, constant-current circuit 16 and intrinsic safety output load 17; input ac power inserts DC transfer circuit 10, and intrinsic safety output load 17 inserts intrinsic safety electric source.
Constant-current circuit 16 among Fig. 1 is a known technology, adopts 15mA constant current tube DL to constitute.The positive pole of constant current tube DL is connected to the 18.5V output line of DC transfer circuit 10, and the negative pole of constant current tube DL is connected to the 0V output line of DC transfer circuit 10.
With reference to Fig. 1, in the circuit theory diagrams of the intrinsically safe power supply of the utility model high-output power:
One, overvoltage crowbar 11
Another overvoltage crowbar 11 ' version identical with principle with overvoltage crowbar 11, constitute dualization overvoltage crowbar.
Two, current foldback circuit 12
Another current foldback circuit 12 ' version identical with principle with current foldback circuit 12, constitute dualization current foldback circuit.
Three, the slow protective circuit 13 of heavy duty
The slow protective circuit 13 of heavy duty comprises adjusts pipe Q103; the slow switch triode Q101 of PNP; the 3rd resistance R 102 and NPN triode Q104; the emitter of NPN triode Q104 links to each other with the drain electrode of adjusting pipe Q103; the collector electrode of NPN triode Q104 links to each other with the grid of adjusting pipe Q103; the base stage of NPN triode Q104 links to each other through the collector electrode of the 3rd resistance R 102 with the slow switch triode Q101 of PNP; the 18.5V output line that the emitter of the slow switch triode Q101 of PNP is connected to DC transfer circuit 10 through the delay capacitor C101 and the diode D101 of forward series connection mutually, the base stage of the slow switch triode Q101 of PNP inserts 13VZ voltage.
The slow protective circuit 13 of another heavy duty ' version identical with the slow protective circuit 13 of principle and heavy duty, constitute dualization heavy duty protective circuit slowly.
Four, the fast protective circuit 14 of heavy duty
The fast protective circuit 14 of heavy duty comprises adjusts the fast switch triode Q102 of pipe Q103, PNP, the 3rd resistance R 102, NPN triode Q104, delay capacitor C101 and diode D101; the emitter of the fast switch triode Q102 of PNP links to each other with the emitter of the slow switch triode Q101 of PNP; the collector electrode of the fast switch triode Q102 of PNP links to each other with the collector electrode of the slow switch triode Q101 of PNP, and the base stage of the fast switch triode Q102 of PNP is connected to the tie point of delay capacitor C101 and diode D101.
The fast protective circuit 14 of another heavy duty ' version identical with the fast protective circuit 14 of principle and heavy duty, constitute dualization heavy duty protective circuit soon.
Five, restore circuit 15
Another recondition circuit 15 ' version identical with principle with restore circuit 15, constitute dualization restore circuit.
Describe the operation principle of the intrinsically safe power supply of the utility model high-output power in detail below in conjunction with accompanying drawing.
One, overvoltage crowbar 11
When certain reason caused the higher 18.5V of reaching of DC transfer circuit 10 output, the control utmost point of controllable silicon Q3 obtained sufficiently high voltage and conducting, thereby cuts off entire circuit output.
Two, current foldback circuit 12
1. when load current during less than the 1.5A electric current, the voltage on the sample resistance R0 is big inadequately, amplifying circuit B1 output high level relatively, and the grid of adjusting pipe Q103 obtains enough grid voltages and saturation conduction by R106, and load obtains.
2. when electric current reached 1.5A, sample resistance R0 went up and obtains enough voltage, and relatively the output level of amplifying circuit B1 reduces rapidly, dragged down the grid voltage of adjusting pipe Q103 and made it enter magnifying state, raise its drain potential, reduce output voltage, thereby suppress the increase of load current.
Three, the slow protective circuit 13 of heavy duty
When load further increases the weight of, make the grid voltage of adjusting pipe Q103 further reduce, its drain potential continues to rise, and then cause the slow switch triode Q101 of PNP conducting, and then NPN triode Q104 conducting, the grid voltage of adjusting pipe Q103 reduces more, and then quickens to adjust raising of pipe Q103 drain potential, circuit enters the positive feedback state, thereby makes that adjusting pipe Q103 thoroughly ends.
Four, the fast protective circuit 14 of heavy duty
When the circuit operate as normal, to delay capacitor C101 charging, diode D101 both end voltage was near 18.5V after charging was finished by diode D101 for out-put supply.
When occurring that load increases the weight of suddenly or during the load instantaneous short circuit, relatively amplifying circuit B1 at first makes a response, cause adjusting pipe Q103 drain potential and sharply rise, also be that the emitter current potential of the fast switch triode Q102 of PNP sharply rises.Because delay capacitor C101 does not have discharge path, the base potential of the fast switch triode Q102 of PNP remains unchanged substantially.When adjusting the about 0.7V of pipe Q103 drain potential rising, the fast switch triode Q102 of PNP conducting, and then NPN triode Q104 conducting, adjust rapid reduction of grid voltage of pipe Q103 and enter magnifying state, when adjustment pipe Q103 drain potential rises to certain value, also conducting of the slow switch triode Q101 of PNP ends the output of instantaneous trip power thereby accelerate to adjust pipe Q103.
Five, restore circuit 15
Made on the basis of the fast protection action of heavy duty at the about 0.7V of rising when adjusting pipe Q103 drain potential; when rising about 0.3V (diode D101 pressure drop) again; discharge reduction triode Q105 conducting; start delay capacitor C101 electric charge by bleed off; guarantee delay capacitor C101 negative terminal voltage tracking output negative potential (low approximately 0.7V); the guard mode of removing the fast switch triode Q102 of PNP is ended it, for the protection again after the short-circuit condition releasing is got ready.
When circuit broke away from short-circuit condition, constant current tube DL was at first to delay capacitor C101 charging, and charging voltage reaches heavy duty when protecting the voltage operating point following slowly; PNP is slow, and switch triode Q101 protection is removed; transfer cut-off state to, thereby the recovery normal operating conditions is removed in the protection of adjusting pipe Q103.
The intrinsically safe power supply of the utility model high-output power, to short circuit, the sparkover that produces such as touch or when load heavily arrive to a certain degree, circuit can fast detecting, protection fast, cuts off circuit power output, quick arc control.This device meets the requirement of GB3836.4, and constant current work is convenient to be applied to the driving of LED illuminating lamp, and after abnormal condition was eliminated, circuit can automatically terminate protection, recovers operate as normal.In March, 2010 is through Shanghai electrical explosion proof inspection point spark ignition experimental examination, and the survey report that provide at this station shows, when equipment output 18.5V, 1.5A, and pass the test.In actual tests, output current reaches 1.6A even when higher, it is still qualified to test.
Embodiment recited above is described preferred implementation of the present utility model; be not that design of the present utility model and scope are limited; do not breaking away under the utility model design prerequisite; common engineers and technicians make the technical solution of the utility model in this area various modification and improvement; all should fall into protection range of the present utility model; the technology contents that the utility model is asked for protection all is documented in claims.
Claims (6)
1. the intrinsically safe power supply of a high-output power; comprise DC transfer circuit (10), overvoltage crowbar (11), current foldback circuit (12) and intrinsic safety output load (17); input ac power inserts described DC transfer circuit (10); insert intrinsic safety electric source to described intrinsic safety output load (17); it is characterized in that: also comprise the slow protective circuit (13) of heavy duty, the fast protective circuit (14) of heavy duty, constant-current circuit (16) and restore circuit (15), wherein:
The slow protective circuit of described heavy duty (13) comprises adjusts pipe (Q103), the slow switch triode of PNP (Q101), the 3rd resistance R 102 and NPN triode (Q104), the emitter of described NPN triode (Q104) links to each other with the drain electrode of described adjustment pipe (Q103), the collector electrode of described NPN triode (Q104) links to each other with the grid of described adjustment pipe (Q103), the base stage of described NPN triode (Q104) links to each other through the collector electrode of described the 3rd resistance (R102) with the slow switch triode of described PNP (Q101), the delay capacitor (C101) of the mutual forward series connection of emitter warp of the slow switch triode of described PNP (Q101) and the 18.5V output line that diode (D101) is connected to described DC transfer circuit (10), the base stage of the slow switch triode of described PNP (Q101) inserts 13VZ voltage;
Described constant-current circuit (16) adopts constant current tube (DL) to constitute, and the positive pole of described constant current tube (DL) is connected to the 18.5V output line of described DC transfer circuit (10), and the negative pole of described constant current tube (DL) is connected to the 0V output line of described DC transfer circuit (10);
The fast protective circuit of described heavy duty (14) comprises adjusts pipe (Q103), the fast switch triode of PNP (Q102), the 3rd resistance (R102), NPN triode (Q104), described delay capacitor (C101) and diode (D101), the emitter of the fast switch triode of described PNP (Q102) links to each other with the emitter of the slow switch triode of described PNP (Q101), the collector electrode of the fast switch triode of described PNP (Q102) links to each other with the collector electrode of the slow switch triode of described PNP (Q101), and the base stage of the fast switch triode of described PNP (Q102) is connected to the tie point of described delay capacitor (C101) and described diode (D101);
Described restore circuit (15) comprises PNP reset transistor (Q105), the collector electrode of described PNP reset transistor (Q105) links to each other with the positive pole of described delay capacitor (C101), the emitter of described PNP reset transistor (Q105) links to each other with the negative pole of described delay capacitor (C101), the base stage of described PNP reset transistor (Q105) links to each other with the emitter of the fast switch triode of described PNP (Q102), links to each other with the tie point of described constant-current circuit (16) with described intrinsic safety output load (17) simultaneously.
2. the intrinsically safe power supply of high-output power according to claim 1; it is characterized in that: wherein said overvoltage crowbar (11) comprises controllable silicon (Q3); voltage-stabiliser tube (D1) and first resistance (R8); the positive pole of described controllable silicon (Q3) is connected to the 18.5V output line of described DC transfer circuit (10); the negative pole of described controllable silicon (Q3) is connected to the 0V output line of described DC transfer circuit (10); the positive pole of described voltage-stabiliser tube (D1) is connected to the 18.5V output line of described DC transfer circuit (10); the negative pole of described voltage-stabiliser tube (D1) is connected to the control utmost point of described controllable silicon (Q3), and described first resistance (R8) is connected between the 0V output line of the control utmost point of described controllable silicon (Q3) and described DC transfer circuit (10).
3. the intrinsically safe power supply of high-output power according to claim 1 and 2; it is characterized in that: wherein said current foldback circuit (12) comprises sample resistance (R0); compare amplifying circuit (B1); second resistance (R106) and adjustment pipe (Q103); described sample resistance (R0) and described adjustment pipe (Q103) series connection are to the loop of described intrinsic safety output load (17); the described relatively positive input of amplifying circuit (B1) is connected to the hot end of described sample resistance (R0); the described relatively negative input of amplifying circuit (B1) is connected to the cold end of described sample resistance (R0); the output of described relatively amplifying circuit (B1) is connected to the grid of described adjustment pipe (Q103), and described second resistance (R106) is connected between the grid of the 18.5V output line of described DC transfer circuit (10) and described adjustment pipe (Q103).
4. the intrinsically safe power supply of high-output power according to claim 3, it is characterized in that: wherein said overvoltage crowbar (11), current foldback circuit (12), the slow protective circuit (13) of heavy duty, the fast protective circuit (14) of heavy duty, constant-current circuit (16) and restore circuit (15) are provided with 2 covers respectively at least, and the structure of another overvoltage crowbar (11 ') is identical with described overvoltage crowbar (11); The structure of another current foldback circuit (12 ') is identical with described current foldback circuit (12); The structure of the slow protective circuit (13 ') of another heavy duty is identical with the slow protective circuit of described heavy duty (13); The structure of the fast protective circuit (14 ') of another heavy duty is identical with the fast protective circuit of described heavy duty (14); The structure of another recondition circuit (15 ') is identical with described restore circuit (15).
5. the intrinsically safe power supply of high-output power according to claim 4, it is characterized in that: the constant current value of wherein said constant current tube (DL) is 15mA.
6. the intrinsically safe power supply of high-output power according to claim 5, it is characterized in that: the input voltage of wherein said DC transfer circuit (10) is 127V, and output voltage is 18.5V, and output current is 1.5A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020294070XU CN201699599U (en) | 2010-08-17 | 2010-08-17 | Intrinsic-intrinsic-safety power supply with high output power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020294070XU CN201699599U (en) | 2010-08-17 | 2010-08-17 | Intrinsic-intrinsic-safety power supply with high output power |
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| CN201699599U true CN201699599U (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020294070XU Expired - Lifetime CN201699599U (en) | 2010-08-17 | 2010-08-17 | Intrinsic-intrinsic-safety power supply with high output power |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088248A (en) * | 2010-08-17 | 2011-06-08 | 淮南市长安机电设备有限公司 | Intrinsically safe power supply with high output power |
| CN106443499A (en) * | 2016-08-22 | 2017-02-22 | 海南师范大学 | Handheld direct-current switched power source output intrinsic safety detector and detection method |
-
2010
- 2010-08-17 CN CN201020294070XU patent/CN201699599U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088248A (en) * | 2010-08-17 | 2011-06-08 | 淮南市长安机电设备有限公司 | Intrinsically safe power supply with high output power |
| CN102088248B (en) * | 2010-08-17 | 2013-06-12 | 淮南市长安机电设备有限公司 | Intrinsically safe power supply with high output power |
| CN106443499A (en) * | 2016-08-22 | 2017-02-22 | 海南师范大学 | Handheld direct-current switched power source output intrinsic safety detector and detection method |
| CN106443499B (en) * | 2016-08-22 | 2019-01-22 | 海南师范大学 | Hand-held direct-current switch power supply exports intrinsic safety detection method |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20110105 Effective date of abandoning: 20130612 |
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| RGAV | Abandon patent right to avoid regrant |