CN203788146U - Large-power output ia-grade intrinsically-safe power circuit - Google Patents
Large-power output ia-grade intrinsically-safe power circuit Download PDFInfo
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- CN203788146U CN203788146U CN201420067252.1U CN201420067252U CN203788146U CN 203788146 U CN203788146 U CN 203788146U CN 201420067252 U CN201420067252 U CN 201420067252U CN 203788146 U CN203788146 U CN 203788146U
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Abstract
The utility model discloses a large-power output ia-grade intrinsically-safe power circuit. In order to avoid instable voltage outputted by the power supply and avoid electric energy loss due to overhigh voltage at the current limiting resistor end, two feedbacks are arranged for regulating input voltage, one feedback is the feedback of a direct current output end to the input end of the current limiting module, the input voltage of the current limiting module and a voltage stabilization module is regulated via the voltage regulation module, the other feedback is the feedback of the direct current output end to an alternating current input end, and particularly the input voltage of primary winding of a high-frequency transformer is regulated via a pulse width modulation circuit. According to the large-power output ia-grade intrinsically-safe power circuit, the voltage outputted by the power supply is stable, large power can be outputted, and the energy consumption is low.
Description
Technical field
The utility model relates to electrical apparatus for explosive atmospheres and part field, is specifically related to a kind of high-power output ia grade intrinsically safe power supply circuit.
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 realized 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.
Because the electric equipment in workplaces such as collieries is all to use DC power supply, the one, for the purpose of safety, and the 2nd, the power supply that dry cell easy to use etc. carry.When needs are used external power supply, just need to use the power supply that interchange is changed into direct current, and the power supply that workplace is used in colliery etc. is generally intrinsically safe power supply, intrinsically safe power supply is the same with intrinsicallysafe electrical apparatus, also being the principle based on same, is a kind of explosion-proof electrical source.
Essential safe type circuit divides " ia " and " ib " two grades, and what in colliery, most of place was all used is " ib " grade, and requires to use " ia " grade at the Different high risk sites of the long-term existence gas such as getting working face, gas drainage system.Simply, the intrinsically safe circuit of " ib " grade needs double independently over-current over-voltage protection, and the intrinsically safe circuit of " ia " grade needs three kinds of independently over-current over-voltage protections (referring to GB3836-2010).
Practical ia level intrinsically safe power supply is all to use the mode of simple resistance current limliting to carry out Limited Current at present; overvoltage protection is used power tube to make to export intrinsically safe power supply internal short-circuit and realizes; most like this energy all consumes by inner current-limiting resistance heating; shortcoming is that the output of voltage is very unstable; the power of output is smaller; and energy consumption is higher, in the occasion of the electric energy anxieties such as colliery, uses and waste very much electric energy.
Therefore, designing a kind of new ia grade intrinsically safe power supply circuit, make the output voltage stabilization of power supply, can export larger power, and energy consumption is low, is this area technical issues that need to address.
Utility model content
The technical problems to be solved in the utility model: design a kind of new ia grade intrinsically safe power supply circuit, make electric power output voltage stable, can export larger power, and energy consumption is low.
For solving the problems of the technologies described above, the technical solution of the utility model is as follows:
A high-power output ia grade intrinsically safe power supply circuit, comprises ac input end, switch power module, current limliting module, Voltage stabilizing module, Voltage Regulator Module and DC output end; Described switch power module comprises filter circuit, rectification circuit, high frequency transformer and rectification reduction voltage circuit; Described current limliting module is provided with a plurality of current-limiting resistances of mutual series connection, and its input is connected with the output of the rectification reduction voltage circuit of described switch power module; Described Voltage stabilizing module comprises three voltage stabilizing circuits in parallel and a sample circuit, and three inputs of described voltage stabilizing circuit are all connected with the output of described current limliting module; Described Voltage Regulator Module comprises three feedback circuits and three regulating circuits;
Described sample circuit comprises three inputs and six outputs, three inputs are connected with three outputs of described voltage stabilizing circuit respectively, six outputs comprise three feedback output ends that are connected with the input of described feedback circuit, three output end of pressure-stabilizing that are connected with the negative pole of DC output end, and described three feedback output ends are corresponding one by one with three inputs of described sample circuit respectively, described three output end of pressure-stabilizing are also corresponding one by one with three inputs of described sample circuit respectively; Three outputs of described feedback circuit are connected with three inputs of described regulating circuit respectively; Three outputs of described regulating circuit are all connected with the input of described current limliting module.
Preferably, the structure in described switch power module is that the armature winding of described filter circuit, rectification circuit, high frequency transformer is connected in parallel; The output of described filter circuit connects the input of described rectification circuit, and the output of described rectification circuit connects the terminals one of the armature winding of described high frequency transformer; The terminals two of the output of described filter circuit, rectification circuit and the armature winding of described high frequency transformer are all connected with the zero line of described ac input end; The terminals one of the secondary winding of described high frequency transformer connect the input of described rectification reduction voltage circuit, and the terminals two of the secondary winding of described high frequency transformer connect the negative pole of described DC output end; The live wire of described ac input end connects the input of described filter circuit, and zero line connects the terminals two of the armature winding of described high frequency transformer.
Preferably, between the terminals two of the armature winding of described high frequency transformer and the zero line of described ac input end, be provided with pulse-width modulation circuit, between the output of the regulating circuit of described Voltage Regulator Module and the input of described current limliting module, be provided with buffer circuit.
Preferably, described pulse-width modulation circuit is provided with three links, comprises the modulation output that the terminals two of the power input being connected with the zero line of described ac input end, the DC feedback end being connected with described buffer circuit and armature winding with described high frequency transformer are connected; Described buffer circuit is provided with three inputs and three outputs, and three inputs of described buffer circuit are connected with three outputs of described regulating circuit respectively; Three outputs of described buffer circuit comprise the isolation end that the terminals two of the current limliting feedback end being connected with the input of described current limliting module, the pulse-width modulation feedback end being connected with described pulse-width modulation circuit and secondary winding with described high frequency transformer are connected.
Preferably, the current-limiting resistance of described current limliting module setting is three.
Pass through technique scheme, we have designed a kind of new high-power output ia grade intrinsically safe power supply circuit, spread of voltage for fear of power supply output, with because the electric energy loss causing at the overtension of current-limiting resistance end, by being set, two feedbacks regulate input voltage, one is fed back to the feedback of DC output end to the input of current limliting module, by Voltage Regulator Module, regulate the input voltage of current limliting module and Voltage stabilizing module, another is the feedback of DC output end to ac input end, specifically by pulse-width modulation circuit, regulate the input voltage of high frequency transformer armature winding.Its beneficial effect is: electric power output voltage is stable, can export larger power, and energy consumption is low.
Accompanying drawing explanation
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 skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the disclosed a kind of high-power output ia grade intrinsically safe power supply circuit of the utility model embodiment.
Numeral and the represented corresponding component title of letter in figure:
1. ac input end 2. switch power module 21. filter circuit 22. rectification circuit 23. high frequency transformer 24. rectification reduction voltage circuit 25. pulse-width modulation circuit 26. buffer circuit 3. current limliting module 31. current-limiting resistance 4. Voltage stabilizing module 41. voltage stabilizing circuit 42. sample circuit 5. Voltage Regulator Module 51. feedback circuit 52. regulating circuit 6. DC output ends.
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, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills 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: designed a kind of new high-power output ia grade intrinsically safe power supply circuit, spread of voltage for fear of power supply output, with because the electric energy loss causing at the overtension of current-limiting resistance end, by being set, two feedbacks regulate input voltage, one is fed back to the feedback of DC output end to the input of current limliting module, by Voltage Regulator Module, regulate the input voltage of current limliting module and Voltage stabilizing module, another is the feedback of DC output end to ac input end, specifically by pulse-width modulation circuit, regulate the input voltage of high frequency transformer armature winding.
Embodiment:
As shown in Figure 1, a kind of high-power output ia grade intrinsically safe power supply circuit, comprises ac input end 1, switch power module 2, current limliting module 3, Voltage stabilizing module 4, Voltage Regulator Module 5 and DC output end 6; Switch power module comprises filter circuit 21, rectification circuit 22, high frequency transformer 23 and rectification reduction voltage circuit 24; Current limliting module 3 is provided with a plurality of current-limiting resistances 31 of mutual series connection, and its input is connected with the output of the rectification reduction voltage circuit 24 of switch power module; Voltage stabilizing module 4 comprises three voltage stabilizing circuits in parallel 41 and a sample circuit 42, and three inputs of voltage stabilizing circuit 41 are all connected with the output of current limliting module 3; Voltage Regulator Module 5 comprises three feedback circuits 51 and three regulating circuits 52;
Sample circuit 42 comprises three inputs and six outputs, three inputs are connected with three outputs of voltage stabilizing circuit 41 respectively, six outputs comprise three feedback output ends that are connected with the input of feedback circuit 51, three output end of pressure-stabilizing that are connected with the negative pole of DC output end 6, and three feedback output ends are corresponding one by one with three inputs of sample circuit 42 respectively, three output end of pressure-stabilizing are also corresponding one by one with three inputs of sample circuit 42 respectively; Three outputs of feedback circuit 51 are connected with three inputs of regulating circuit 52 respectively; Three outputs of regulating circuit 52 are all connected with the input of current limliting module 3.
Three voltage stabilizing circuits in parallel 41 are set, the better effects if of voltage stabilizing like this, but connect after different loads, voltage still can be unstable, so regulating circuit 52 is set, regulating circuit 52 obtains the numerical value of the voltage of DC output end by feedback circuit 51, then carry out opposite direction and regulate (namely negative feedback), if DC output end 6 overtensions, what just regulate is lower, otherwise what just regulate is higher.
Voltage stabilizing circuit 41 can be used voltage stabilizing didoe, parallel transistor voltage stabilizing circuit, switching mode voltage stabilizing circuit etc., and this is that those skilled in the art understand, in this no limit.
Regulating circuit 52 has a lot of modes such as silicon-controlled voltage regulation, integrated circuit pressure regulation, in this no limit.
In the present embodiment, the structure in switch power module 2 is that the armature winding of filter circuit 21, rectification circuit 22, high frequency transformer 23 is connected in parallel; The output of filter circuit 21 connects the input of rectification circuit 22, and the output of rectification circuit 22 connects the terminals one of the armature winding of high frequency transformer 23; The terminals two of the output of filter circuit 21, rectification circuit 22 and the armature winding of high frequency transformer 23 are all connected with the zero line of ac input end 1; The terminals one of the secondary winding of high frequency transformer 23 connect the input of rectification reduction voltage circuit 24, and the terminals two of the secondary winding of high frequency transformer 23 connect the negative pole of DC output end 6; The live wire of ac input end 1 connects the input of filter circuit 21, and zero line connects the terminals two of the armature winding of high frequency transformer 23.
Switch power module is also the circuit that a kind of conventional interchange turns direct current, and the structure in the present embodiment, except being provided with conventional filter circuit, rectification circuit etc., has also increased pulse-width modulation circuit and buffer circuit
In the present embodiment, pulse-width modulation circuit 25 is located between the terminals two of armature winding and the zero line of ac input end 1 of high frequency transformer 23, and buffer circuit 26 is located between the output of regulating circuit 52 and the input of current limliting module 3 of Voltage Regulator Module.
Pulse-width modulation circuit is a kind of analog control mode, and its variation according to respective loads carrys out the biasing of modulation transistor base stage or metal-oxide-semiconductor grid, realizes the change of transistor or metal-oxide-semiconductor ON time, thereby realizes the change of switching power supply output.Pulse-width modulation circuit both can change the size of output voltage, also can change output frequency.Control simply effectively, use very extensive.
In the present embodiment, pulse-width modulation circuit 25 is provided with three links, comprises the modulation output that the terminals two of the power input being connected with the zero line of ac input end 1, the DC feedback end being connected with buffer circuit 26 and armature winding with high frequency transformer 23 are connected.Buffer circuit 26 is provided with three inputs and three outputs, and three inputs of buffer circuit 26 are connected with three outputs of regulating circuit 52 respectively; Three outputs of buffer circuit 26 comprise the isolation end that the terminals two of the current limliting feedback end being connected with the input of current limliting module 3, the pulse-width modulation feedback end being connected with pulse-width modulation circuit 25 and secondary winding with high frequency transformer 23 are connected.
In the present embodiment, the current-limiting resistance 31 that current limliting module 3 arranges is three, can reach good current limitation effect like this.
In the above-described embodiments, we have designed a kind of new high-power output ia grade intrinsically safe power supply circuit, spread of voltage for fear of power supply output, with because the electric energy loss causing at the overtension of current-limiting resistance end, by being set, two feedbacks regulate input voltage, one is fed back to the feedback of DC output end to the input of current limliting module, by Voltage Regulator Module, regulate the input voltage of current limliting module and Voltage stabilizing module, another is the feedback of DC output end to ac input end, specifically by pulse-width modulation circuit, regulate the input voltage of high frequency transformer armature winding.Its beneficial effect is: electric power output voltage is stable, can export larger power, and energy consumption is low.
Above 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 high-power output ia grade intrinsically safe power supply circuit, is characterized in that, comprises ac input end, switch power module, current limliting module, Voltage stabilizing module, Voltage Regulator Module and DC output end; Described switch power module comprises filter circuit, rectification circuit, high frequency transformer and rectification reduction voltage circuit; Described current limliting module is provided with a plurality of current-limiting resistances of mutual series connection, and its input is connected with the output of the rectification reduction voltage circuit of described switch power module; Described Voltage stabilizing module comprises three voltage stabilizing circuits in parallel and a sample circuit, and three inputs of described voltage stabilizing circuit are all connected with the output of described current limliting module; Described Voltage Regulator Module comprises three feedback circuits and three regulating circuits;
Described sample circuit comprises three inputs and six outputs, three inputs are connected with three outputs of described voltage stabilizing circuit respectively, six outputs comprise three feedback output ends that are connected with the input of described feedback circuit, three output end of pressure-stabilizing that are connected with the negative pole of DC output end, and described three feedback output ends are corresponding one by one with three inputs of described sample circuit respectively, described three output end of pressure-stabilizing are also corresponding one by one with three inputs of described sample circuit respectively; Three outputs of described feedback circuit are connected with three inputs of described regulating circuit respectively; Three outputs of described regulating circuit are all connected with the input of described current limliting module.
2. a kind of high-power output ia grade intrinsically safe power supply circuit according to claim 1, is characterized in that, the structure in described switch power module is that the armature winding of described filter circuit, rectification circuit, high frequency transformer is connected in parallel; The output of described filter circuit connects the input of described rectification circuit, and the output of described rectification circuit connects the terminals one of the armature winding of described high frequency transformer; The terminals two of the output of described filter circuit, rectification circuit and the armature winding of described high frequency transformer are all connected with the zero line of described ac input end; The terminals one of the secondary winding of described high frequency transformer connect the input of described rectification reduction voltage circuit, and the terminals two of the secondary winding of described high frequency transformer connect the negative pole of described DC output end; The live wire of described ac input end connects the input of described filter circuit, and zero line connects the terminals two of the armature winding of described high frequency transformer.
3. a kind of high-power output ia grade intrinsically safe power supply circuit according to claim 2, it is characterized in that, between the terminals two of the armature winding of described high frequency transformer and the zero line of described ac input end, be provided with pulse-width modulation circuit, between the output of the regulating circuit of described Voltage Regulator Module and the input of described current limliting module, be provided with buffer circuit.
4. a kind of high-power output ia grade intrinsically safe power supply circuit according to claim 3, it is characterized in that, described pulse-width modulation circuit is provided with three links, comprises the modulation output that the terminals two of the power input being connected with the zero line of described ac input end, the DC feedback end being connected with described buffer circuit and armature winding with described high frequency transformer are connected; Described buffer circuit is provided with three inputs and three outputs, and three inputs of described buffer circuit are connected with three outputs of described regulating circuit respectively; Three outputs of described buffer circuit comprise the isolation end that the terminals two of the current limliting feedback end being connected with the input of described current limliting module, the pulse-width modulation feedback end being connected with described pulse-width modulation circuit and secondary winding with described high frequency transformer are connected.
5. according to a kind of high-power output ia grade intrinsically safe power supply circuit described in claim 1-4 any one, it is characterized in that, the current-limiting resistance of described current limliting module setting is three.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420067252.1U CN203788146U (en) | 2014-02-17 | 2014-02-17 | Large-power output ia-grade intrinsically-safe power circuit |
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| CN201420067252.1U CN203788146U (en) | 2014-02-17 | 2014-02-17 | Large-power output ia-grade intrinsically-safe power circuit |
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| CN203788146U true CN203788146U (en) | 2014-08-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104234A (en) * | 2020-09-29 | 2020-12-18 | 北京瑞赛长城航空测控技术有限公司 | Ia protection level intrinsic safety type power supply circuit with constant voltage output for coal mine |
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2014
- 2014-02-17 CN CN201420067252.1U patent/CN203788146U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104234A (en) * | 2020-09-29 | 2020-12-18 | 北京瑞赛长城航空测控技术有限公司 | Ia protection level intrinsic safety type power supply circuit with constant voltage output for coal mine |
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Granted publication date: 20140820 Termination date: 20170217 |
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| CF01 | Termination of patent right due to non-payment of annual fee |