CN103138607A - High direct voltage constant current power supply safety protection device with low-voltage protection function - Google Patents
High direct voltage constant current power supply safety protection device with low-voltage protection function Download PDFInfo
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Abstract
A high direct voltage constant current power supply safety protection device with a low-voltage protection function comprises an LC constant current power source, a boosting transformer, a silicon controlled rectifier bridge and a low-voltage protection circuit which are connected in sequence. The low-voltage protection circuit comprises a voltage sampling module, a low-voltage processing module and an output control module. The voltage sampling module is arranged on a low-voltage input side of the boosting transformer. The output control module is arranged between the voltage sampling module and the boosting transformer. An input end of the low-voltage processing module is connected with an output end of the voltage sampling module. An output end of the low-voltage processing module is connected with the output control module so that detection is performed to input voltage. When voltage on a low-voltage side is reduced to a preset voltage value, a circuit on the low-voltage side of the boosting transformer is disconnected through the output control module. The high direct voltage constant current power supply safety protection device with the low-voltage protection function is simple in principle, reliable in control, capable of effectively preventing occurrence of serious consequences of serious electro-discharge and even fire or explosion and the like caused by constant flow source fault or pollution, low in investment and easy to operate and maintain.
Description
Technical field
The present invention relates to line under-voltage resist technology field, especially a kind of safety guard with high direct voltage constant-current supply of under-voltage protection function.
Background technology
At present, known coke gas electric tar is that the important procedure of coal gas process field, particularly coal gas need high voltage direct current to react absorption in electric tar technique, and the tar ingredients in coal gas is converged, being the important production technology of coking process, is also the technique that is in extreme danger.The high direct voltage circuit of electrical tar precipitator and system ontology can make receiving electrode and dizzy silk or cable connection etc. locate to produce accumulation because adsorb a large amount of tar and coke powder etc. in During Process of Long-term Operation, cause insulation effect to descend, and very easily draw electric discharge phenomena.When the electric discharge phenomena addition polymerization, the unpredictable consequences such as meeting initiation fire, blast.At present, the most electric tar protection equipment of buying of enterprise are protected, but the purchase of equipment cost is high, and principle is complicated, and maintenance is difficult.
Summary of the invention
The shortcoming that exists in order to overcome above-mentioned prior art the object of the present invention is to provide a kind of cost low, and principle is simple, and operating maintenance has the high direct voltage constant-current supply safety guard of under-voltage protection function easily.
In order to address the above problem, the present invention is by the following technical solutions: a kind of high direct voltage constant-current supply safety guard with under-voltage protection function, comprise the LC constant-current supply, step-up transformer and the controllable silicon rectifying bridge that connect successively, it is characterized in that: also comprise under-voltage protecting circuit, described under-voltage protecting circuit comprises voltage sample module, under-voltage processing module and output control module, described voltage sample module is arranged on the low pressure input side of step-up transformer, and described output control module is arranged between voltage sample module and step-up transformer; The input of described under-voltage processing module is connected with the output of voltage sample module, output is connected with output control module, be used for input voltage is detected, when low-pressure side voltage drops to the lower-voltage circuit loop that disconnects step-up transformer when presetting magnitude of voltage by output control module.
Further, described voltage sample module comprises voltage sensor, described under-voltage processing module comprises single-chip microcomputer, described output control module comprises relay, described voltage sensor is arranged in the low pressure input side circuit loop of step-up transformer, the normally closed switch of described relay is arranged between voltage sensor and step-up transformer, and the input of described single-chip microcomputer is connected with the output of voltage sensor, and output is connected with the coil of relay.
Further, described under-voltage protecting circuit comprises under-voltage relay, the time relay and control relay; The coil two ends of described under-voltage relay are arranged in circuit loop between LC constant-current supply and step-up transformer; After the normal open switch of the coil of described time relay series connection under-voltage relay with the coils from parallel connection of coils of under-voltage relay; After the normal open switch of the coil of the described control relay series connection time relay, with the coils from parallel connection of coils of under-voltage relay, the normally closed switch of described control relay is arranged in close step-up transformer lateral circuit loop between LC constant-current supply and step-up transformer.
Further, be provided with control switch at an end of the coil of under-voltage relay, described control switch is connected with the parallel circuits of all described under-voltage relay coils.
The invention has the beneficial effects as follows: it adds a under-voltage protecting circuit to lower-voltage circuit before boosting; circuit cuts off automatically when voltage drops to set point; has under-voltage protection function; the voltage sample module of this under-voltage protecting circuit is arranged on the low pressure input side of step-up transformer; can control incoming power in advance; thereby reach the target of anticipation in advance and action, guaranteed the safe operation of equipment.This high direct voltage constant-current supply principle with under-voltage protection function is simple, control reliable, invest less, and maintenance easy to operate.
Description of drawings
The present invention is described further below in conjunction with drawings and Examples:
Fig. 1 is the theory diagram of one embodiment of the invention;
Fig. 2 is the circuit diagram of another embodiment of the present invention.
Embodiment
Embodiment 1
As shown in Figure 1; a kind of high direct voltage constant-current supply safety guard with under-voltage protection function of the present invention; it comprises LC constant-current supply, step-up transformer and the controllable silicon rectifying bridge that connects successively, also comprises under-voltage protecting circuit in the middle of LC constant-current supply and step-up transformer.described under-voltage protecting circuit comprises the voltage sample module, under-voltage processing module and output control module, described voltage sample module adopts voltage sensor, described under-voltage processing module adopts single-chip microcomputer, described output control module adopts relay, described voltage sensor is arranged in the low pressure input side circuit loop of step-up transformer, the normally closed switch of described relay is arranged between voltage sensor and step-up transformer, the input of described single-chip microcomputer is connected with the output of voltage sensor, output is connected with the coil of relay, be used for input voltage is detected, when low-pressure side voltage drops to the lower-voltage circuit loop that disconnects step-up transformer when presetting magnitude of voltage by output control module.
Embodiment 2
As shown in Figure 2; a kind of high direct voltage constant-current supply safety guard with under-voltage protection function of the present invention; it comprises LC constant-current supply, step-up transformer and the controllable silicon rectifying bridge that connects successively, also comprises under-voltage protecting circuit in the middle of LC constant-current supply and step-up transformer.Described under-voltage protecting circuit comprises under-voltage relay KV, time relay KT and control relay KM; The coil two ends of described under-voltage relay KV are arranged in circuit loop between LC constant-current supply and step-up transformer; After the normal open switch of the coil of described time relay KT series connection under-voltage relay KV with the coils from parallel connection of coils of under-voltage relay KV; After the normal open switch of the coil of described control relay KM series connection time relay KT, with the coils from parallel connection of coils of under-voltage relay KV, the normally closed switch of described control relay KM is arranged in close step-up transformer lateral circuit loop between LC constant-current supply and step-up transformer.
In the present embodiment, be provided with control switch SB at an end of the coil of under-voltage relay KV, described control switch is connected with the parallel circuits of all described under-voltage relay coils, and the connection that is used for controlling the under voltage protection circuit disconnects.
After pressing control switch SB, startup under voltage protection circuit carries out under-voltage protection; after step-up transformer low voltage side voltage drops to under-voltage relay KV and presets magnitude of voltage; the normally opened contact of under-voltage relay KV is closed; the coil electricity of time relay KT; after time-delay a period of time (2s), its normally opened contact KT is closed, and the coil of control relay KM gets electric; the normally closed switch of control relay KM disconnects, thereby cuts off the lower-voltage circuit loop of step-up transformer.
Through test, voltage drop 60V with interior be safer, therefore, be to guarantee safety, the present embodiment power taking pressure drop be 40V as the reference voltage of voltage drop, the dead electricity of no-voltage relay is installed with definite value is made as 180V.Through test of many times, after being made as 40V, voltage drop can in time cut off, produce thereby keep away comparatively serious electric discharge phenomena much of that, from having avoided in essence abominable accident.
The above is only the specific embodiment of the present invention, and it is not to Composition of contents restriction of the present invention, and the those of ordinary skill in described field can be made above-mentioned embodiment of the present invention and revising or distortion, and does not deviate from the spirit and scope of the invention.
Claims (4)
1. high direct voltage constant-current supply safety guard with under-voltage protection function, comprise the LC constant-current supply, step-up transformer and the controllable silicon rectifying bridge that connect successively, it is characterized in that: also comprise under-voltage protecting circuit, described under-voltage protecting circuit comprises voltage sample module, under-voltage processing module and output control module, described voltage sample module is arranged on the low pressure input side of step-up transformer, and described output control module is arranged between voltage sample module and step-up transformer; The input of described under-voltage processing module is connected with the output of voltage sample module, output is connected with output control module, be used for input voltage is detected, when low-pressure side voltage drops to the lower-voltage circuit loop that disconnects step-up transformer when presetting magnitude of voltage by output control module.
2. a kind of high direct voltage constant-current supply safety guard with under-voltage protection function according to claim 1, it is characterized in that: described voltage sample module comprises voltage sensor, described under-voltage processing module comprises single-chip microcomputer, described output control module comprises relay, described voltage sensor is arranged in the low pressure input side circuit loop of step-up transformer, the normally closed switch of described relay is arranged between voltage sensor and step-up transformer, the input of described single-chip microcomputer is connected with the output of voltage sensor, output is connected with the coil of relay.
3. a kind of high direct voltage constant-current supply safety guard with under-voltage protection function according to claim 1, it is characterized in that: described under-voltage protecting circuit comprises under-voltage relay, the time relay and control relay; The coil two ends of described under-voltage relay are arranged in circuit loop between LC constant-current supply and step-up transformer; After the normal open switch of the coil of described time relay series connection under-voltage relay with the coils from parallel connection of coils of under-voltage relay; After the normal open switch of the coil of the described control relay series connection time relay, with the coils from parallel connection of coils of under-voltage relay, the normally closed switch of described control relay is arranged in close step-up transformer lateral circuit loop between LC constant-current supply and step-up transformer.
4. a kind of high direct voltage constant-current supply safety guard with under-voltage protection function according to claim 3; it is characterized in that: the end at the coil of under-voltage relay is provided with control switch, and described control switch is connected with the parallel circuits of all described under-voltage relay coils.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310093719XA CN103138607A (en) | 2013-03-22 | 2013-03-22 | High direct voltage constant current power supply safety protection device with low-voltage protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310093719XA CN103138607A (en) | 2013-03-22 | 2013-03-22 | High direct voltage constant current power supply safety protection device with low-voltage protection function |
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| CN103138607A true CN103138607A (en) | 2013-06-05 |
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| CN201310093719XA Pending CN103138607A (en) | 2013-03-22 | 2013-03-22 | High direct voltage constant current power supply safety protection device with low-voltage protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513528A (en) * | 2019-08-15 | 2019-11-29 | 辽宁天海津城装备制造有限公司 | A method of improving solenoid directional control valve commutating speed |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584744U (en) * | 2009-07-15 | 2010-09-15 | 袁留路 | Intelligent power supply protector |
| US20120188670A1 (en) * | 2011-01-26 | 2012-07-26 | Young-Je Lee | Switch control circuit, switch controlling method, and power supply device using the switch control circuit |
-
2013
- 2013-03-22 CN CN201310093719XA patent/CN103138607A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584744U (en) * | 2009-07-15 | 2010-09-15 | 袁留路 | Intelligent power supply protector |
| US20120188670A1 (en) * | 2011-01-26 | 2012-07-26 | Young-Je Lee | Switch control circuit, switch controlling method, and power supply device using the switch control circuit |
Non-Patent Citations (2)
| Title |
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| 丁志鸿: "恒流技术在电捕焦油器中的应用", 《燃料与化工》 * |
| 黄志华等: "城轨车辆110V回路蓄电池欠压保护设计", 《科协论坛（下半月）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513528A (en) * | 2019-08-15 | 2019-11-29 | 辽宁天海津城装备制造有限公司 | A method of improving solenoid directional control valve commutating speed |
| CN110513528B (en) * | 2019-08-15 | 2021-07-09 | 辽宁天海津城装备制造有限公司 | Method for improving reversing speed of electromagnetic reversing valve |
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Application publication date: 20130605 |