CN203691211U - Discharge loop of mine-used frequency inverter - Google Patents
Discharge loop of mine-used frequency inverter Download PDFInfo
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- CN203691211U CN203691211U CN201320877415.8U CN201320877415U CN203691211U CN 203691211 U CN203691211 U CN 203691211U CN 201320877415 U CN201320877415 U CN 201320877415U CN 203691211 U CN203691211 U CN 203691211U
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Abstract
The utility model provides a discharge loop of a mine-used frequency inverter. The discharge loop of the mine-used frequency inverter includes a DC capacitor bank, a relay, two bi-directional voltage-regulator diodes, a discharge lamp and four discharge resistors; two discharge resistors and the two voltage-regulator diodes are connected in series and then are connected with the DC capacitor bank C in parallel; two ends of a working coil of the relay are electrically connected with two end of the voltage-regulator diode; and two wiring ends of a normally-closed contact of the relay are respectively connected in series with one discharge resistor and then are connected with the DC capacitor in parallel. The discharge loop of the mine-used frequency inverter can effectively protect the DC capacitor bank of the frequency inverter and prolonging the service life of the DC capacitor bank, and is small in size so that the discharge loop can be more easily installed in the compact explosion-proof shell of the mine-used frequency inverter; the provided discharge lamp can help to observe whether the discharge is completed, so that the personal safety of the operator is ensured; and each discharge resistor uses the non-inductive resistor, so that when the DC bus of the discharge resistor is connected in parallel with the mine-used frequency inverter, the DC ripple current is not increased.
Description
Technical field
The utility model relates to frequency converter discharge technology field, is specifically related to a kind of discharge loop of mine-used frequency-converter.
Background technology
Coal mine downhole mine is AC-DC-AC voltage-source type frequency converter with the major loop topological structure of frequency converter.Based on the operation principle of AC-DC-AC voltage-source type frequency converter, its direct current component certainly exists the DC capacitor (electrochemical capacitor) that filtering is used.Because DC capacitor capacitance is large, voltage is high, after frequency converter power-off, electric capacity nature discharge process is very slow, and after 30 minutes, capacitor residual voltage can be lower than DC5V, but in mine-used frequency-converter industry standard regulation 15 minutes, capacitor residual voltage must not be higher than DC0.5V.So, must add in addition discharge loop in mine-used frequency-converter inside.Traditional discharge circuit as shown in Figure 1, wherein DC+, DC-are positive pole and the negative pole of the DC bus in mine-used frequency-converter, and KA is contactor, and resistance R is the discharge resistance being serially connected on the normally-closed contact of contactor KA, B1 is control transformer, the direct current capacitor group that C is mine-used frequency-converter.Its operation principle is: in the time that power supply is provided, mine-used frequency-converter and control transformer B1 simultaneously electric, the coil that is connected in parallel on the contactor KA of control transformer B1 secondary obtains electric, and the normally-closed contact of contactor KA disconnects, and is connected in parallel on discharge resistance R on DC bus in open-circuit condition.In the time that power supply disconnects, the coil losing electricity of contactor KA, it is normally closed closed, discharge resistance R access, discharge resistance R is connected in parallel on DC bus, and the energy that DC capacitor group is stored consumes with the form of heat energy.The weak point of this discharge circuit is: the one, discharge too fast, affect the electric capacity life-span: after mine-used frequency-converter dead electricity, the normally closed point of contactor KA is directly closed, now the voltage on DC bus is DC960V or DC1611V, the moment that discharge resistance R drops into can produce larger impulse current, affects the useful life of the direct current capacitor group C of mine-used frequency-converter; The 2nd, contactor KA type selecting difficulty: because generally be control contactor with the contactor of normally closed charging, its contact capacity is little, voltage withstand class is low, general withstand voltage is AC690V, can not be suitable for well this kind of circuit, if there is applicable contactor, need to customize, higher and excessive being difficult to of volume of the contactor expense of customization installs; The 3rd, there is potential safety hazard: the operating state of contactor is difficult for detecting, if electric rear contactor there is no adhesive or dead electricity after contactor do not disconnect, all can cause device damage and jeopardize personal safety, and whether voltage reaches the not corresponding instruction of safety value of standard-required.
Utility model content
The purpose of this utility model is: overcome the deficiencies in the prior art, provide that a kind of structure is small and exquisitely easy to install, fail safe is good and the discharge loop of the mine-used frequency-converter of the DC capacitor of fragile mine-used frequency-converter not.
The technical solution of the utility model is: the discharge loop of mine-used frequency-converter of the present utility model, comprise direct current capacitor group C, its design feature is: also comprise relay K A1, the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2, discharge indicating lamp L1, discharge resistance R1, discharge resistance R2, discharge resistance R3 and discharge resistance R4;
The normally-closed contact of above-mentioned relay K A1 has 2 terminals, and the actuating coil of relay K A1 has 2 terminals; 1 terminals conllinear of one end, the positive pole of discharge indicating lamp L1 and the actuating coil of relay K A1 of one end of discharge resistance R1, one end of the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2; Another 1 terminals conllinear of the other end, the negative pole of discharge indicating lamp L1 and the actuating coil of relay K A1 of one end of discharge resistance R2, the other end of the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2; 1 terminals of the normally-closed contact of relay K A1 are electrically connected with one end of discharge resistance R3; Another 1 terminals of the normally-closed contact of relay K A1 are electrically connected with one end of discharge resistance R4; The other end of the positive pole of direct current capacitor group C, the other end of discharge resistance R3, discharge resistance R3 is all electrically connected with the anodal DC+ of the DC bus in frequency converter; The other end of the negative pole of direct current capacitor group C, the other end of discharge resistance R4, discharge resistance R2 is all electrically connected with the negative pole DC-of the DC bus in frequency converter.
Further scheme is: above-mentioned relay K A1 is the normally-closed contact high pressure dry-reed relay of GRL-2401 model; The first bi-directional voltage stabilizing diode DZ1 and the second bi-directional voltage stabilizing diode DZ2 are the bi-directional voltage stabilizing diode of 1N4749A model.
Further scheme also has: above-mentioned discharge indicating lamp L1 is light-emitting diode; Discharge resistance R1, discharge resistance R2, discharge resistance R3 and discharge resistance R4 are noninductive resistance.
The utlity model has positive effect: the discharge loop of (1) mine-used frequency-converter of the present utility model, by 2 discharge resistances are being set, between 2 discharge resistances, be connected in series 2 bi-directional voltage stabilizing pipes, utilize both end voltage remains unchanged after voltage stabilizing didoe work principle to provide working power for relay, thereby the normally-closed contact of corresponding control relay disconnects or is closed, when after mine-used frequency-converter dead electricity, its direct current capacitor group is first through a process of naturally discharging, relay coil dead electricity in the time that DC bus-bar voltage is reduced to certain value naturally, now again 2 discharge resistances are dropped into, thereby can in the direct current capacitor group of mine-used frequency-converter, not produce larger rush of current, thereby can effectively protect the direct current capacitor group of frequency converter and extend its useful life.(2) discharge loop of mine-used frequency-converter of the present utility model, by adopting high pressure dry-reed relay, it is withstand voltage reaches DC10kV, meet the voltage withstand class requirement of mine-used frequency-converter electric discharge completely, and high pressure dry-reed relay compares to contactor common or customization, volume is little, and has omitted transformer, thereby is easier to install in the explosion-proof casing of compact mine-used frequency-converter.(3) discharge loop of mine-used frequency-converter of the present utility model, by discharge indicating lamp is set, whether can observe easily electric discharge completes, in the time that electric discharge does not reach safe voltage, discharge indicating lamp is lighted always, only have discharge indicating lamp while reaching safe voltage when having discharged just can extinguish, thereby effectively ensured operating personnel's personal safety.(4) discharge loop of mine-used frequency-converter of the present utility model, its discharge resistance is all selected noninductive resistance, thereby it is connected in parallel on and on DC bus, can increase DC ripple electric current.
Brief description of the drawings
Fig. 1 is the structural representation of the discharge loop of the mine-used frequency-converter of prior art;
Fig. 2 is the structural representation of the discharge loop of mine-used frequency-converter of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
(embodiment 1)
See Fig. 2, the discharge loop of the mine-used frequency-converter of the present embodiment, is mainly made up of direct current capacitor group C, relay K A1, the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2, discharge indicating lamp L1, discharge resistance R1, discharge resistance R2, discharge resistance R3 and discharge resistance R4.
In relay K A1 the present embodiment, preferably adopt the normally-closed contact high pressure dry-reed relay that model is GRL-2401, the normally-closed contact of relay K A1 has 2 terminals, and the actuating coil of relay K A1 has 2 terminals.
In the first bi-directional voltage stabilizing diode DZ1 and second bi-directional voltage stabilizing diode DZ2 the present embodiment, all preferably adopting model is the bi-directional voltage stabilizing diode of 1N4749A.
In discharge indicating lamp L1 the present embodiment, preferably adopt light-emitting diode.
In discharge resistance R1, discharge resistance R2, discharge resistance R3 and discharge resistance R4 the present embodiment, all preferably adopt noninductive resistance.
1 terminals conllinear of one end, the positive pole of discharge indicating lamp L1 and the actuating coil of relay K A1 of one end of discharge resistance R1, one end of the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2; Another 1 terminals conllinear of the other end, the negative pole of discharge indicating lamp L1 and the actuating coil of relay K A1 of one end of discharge resistance R2, the other end of the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2; 1 terminals of the normally-closed contact of relay K A1 are electrically connected with one end of discharge resistance R3; Another 1 terminals of the normally-closed contact of relay K A1 are electrically connected with one end of discharge resistance R4; The other end of the positive pole of direct current capacitor group C, the other end of discharge resistance R3, discharge resistance R3 is all electrically connected with the anodal DC+ of the DC bus in frequency converter; The other end of the negative pole of direct current capacitor group C, the other end of discharge resistance R4, discharge resistance R2 is all electrically connected with the negative pole DC-of the DC bus in frequency converter.
Operation principle and the course of work of the discharge loop of the mine-used frequency-converter of the present embodiment are summarized as follows:
The discharge loop of the mine-used frequency-converter of the present embodiment, is parallel on the DC bus of mine-used frequency-converter after the series connection of noninductive resistance and bi-directional voltage stabilizing diode, utilizes both end voltage remains unchanged after voltage stabilizing didoe work principle to provide working power for relay.
When mine-used frequency-converter obtain electric after, DC bus-bar voltage start rise, while rising to the conduction value of the first bi-directional voltage stabilizing diode DZ1 and the second bi-directional voltage stabilizing diode DZ2,2 voltage stabilizing didoe conductings, this voltage can not be greater than DC30V.After voltage stabilizing didoe conducting, its two ends can be exported a galvanic current and be pressed, the coil working of this direct voltage drive relay K A1, thus make relay K A1 adhesive that its normally-closed contact is disconnected, thereafter DC bus-bar voltage continues to rise, until reach normal working voltage.The resistance value of discharge resistance R1 and discharge resistance R2 is larger, and Main Function is current limliting, and irreversible breakdown occurs while avoiding electric current to reach certain value.The effect of the first bi-directional voltage stabilizing diode DZ1 and the second bi-directional voltage stabilizing diode DZ2 parallel connection is to increase the electric current that flows through this loop.In the time of the first bi-directional voltage stabilizing diode DZ1 and the second bi-directional voltage stabilizing diode DZ2 conducting, light discharge indicating lamp L1, be used to indicate the upper dangerous voltage of the inner direct current capacitor group of frequency converter C.
When after mine-used frequency-converter dead electricity, the voltage slow decreasing on the DC bus of mine-used frequency-converter, now the first bi-directional voltage stabilizing diode DZ1 and the second bi-directional voltage stabilizing diode DZ2 still keep conducting, and the normally-closed contact of relay K A1 remains open state.When the lower voltage on the DC bus of mine-used frequency-converter is during to certain value, general this value can be higher than DC100V, due to the current limliting dividing potential drop effect of discharge resistance R1 and electric discharge resistance R2, the first bi-directional voltage stabilizing diode DZ1 and the second bi-directional voltage stabilizing diode DZ2 cut-off, the coil losing electricity of relay K A1, its normally-closed contact closure, discharge resistance R3 and discharge resistance R4 drop into; Now owing to also having voltage between the first bi-directional voltage stabilizing diode DZ1 and the two ends of the second bi-directional voltage stabilizing diode DZ2, so discharge indicating lamp L1 still lights, still point out dangerous voltage to exist, until the DC bus-bar voltage of mine-used frequency-converter is while dropping to utmost point low value, discharge indicating lamp L1 extinguishes, now capacitor residual voltage reaches safety value, and discharge process finishes.
In sum, the discharge loop of the mine-used frequency-converter of the present embodiment, by 2 discharge resistances are being set, between 2 discharge resistances, be connected in series 2 bi-directional voltage stabilizing pipes, utilize both end voltage remains unchanged after voltage stabilizing didoe work principle to provide working power for relay, thereby the normally-closed contact of corresponding control relay disconnects or is closed, when after mine-used frequency-converter dead electricity, its direct current capacitor group is first through a process of naturally discharging, relay coil dead electricity in the time that DC bus-bar voltage is reduced to certain value naturally, now again 2 discharge resistances are dropped into, thereby can in the direct current capacitor group of mine-used frequency-converter, not produce larger rush of current, thereby can effectively protect the direct current capacitor group of frequency converter and extend its useful life, by adopting high pressure dry-reed relay, it is withstand voltage reaches DC10kV, meet the voltage withstand class requirement of mine-used frequency-converter electric discharge completely, and high pressure dry-reed relay compares to contactor common or customization, volume is little, and omit transformer, thereby be easier to install in the explosion-proof casing of compact mine-used frequency-converter, by discharge indicating lamp is set, whether can observe easily electric discharge and complete, in the time that electric discharge does not reach safe voltage, discharge indicating lamp is lighted always, only have discharge indicating lamp while reaching safe voltage when having discharged just can extinguish, thereby effectively ensured operating personnel's personal safety, its discharge resistance is all selected noninductive resistance, thereby it is connected in parallel on and on DC bus, can increase DC ripple electric current.
Above embodiment is the explanation to embodiment of the present utility model; but not to restriction of the present utility model; person skilled in the relevant technique is not in the situation that departing from spirit and scope of the present utility model; can also make various conversion and variation and obtain the corresponding technical scheme being equal to, therefore all technical schemes that are equal to all should be included into scope of patent protection of the present utility model.
Claims (3)
1. the discharge loop of a mine-used frequency-converter, comprise direct current capacitor group C, it is characterized in that: also comprise relay K A1, the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2, discharge indicating lamp L1, discharge resistance R1, discharge resistance R2, discharge resistance R3 and discharge resistance R4;
The normally-closed contact of described relay K A1 has 2 terminals, and the actuating coil of relay K A1 has 2 terminals; 1 terminals conllinear of one end, the positive pole of discharge indicating lamp L1 and the actuating coil of relay K A1 of one end of discharge resistance R1, one end of the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2; Another 1 terminals conllinear of the other end, the negative pole of discharge indicating lamp L1 and the actuating coil of relay K A1 of one end of discharge resistance R2, the other end of the first bi-directional voltage stabilizing diode DZ1, the second bi-directional voltage stabilizing diode DZ2; 1 terminals of the normally-closed contact of relay K A1 are electrically connected with one end of discharge resistance R3; Another 1 terminals of the normally-closed contact of relay K A1 are electrically connected with one end of discharge resistance R4; The other end of the positive pole of direct current capacitor group C, the other end of discharge resistance R3, discharge resistance R3 is all electrically connected with the anodal DC+ of the DC bus in frequency converter; The other end of the negative pole of direct current capacitor group C, the other end of discharge resistance R4, discharge resistance R2 is all electrically connected with the negative pole DC-of the DC bus in frequency converter.
2. the discharge loop of mine-used frequency-converter according to claim 1, is characterized in that: described relay K A1 is the normally-closed contact high pressure dry-reed relay of GRL-2401 model; The first bi-directional voltage stabilizing diode DZ1 and the second bi-directional voltage stabilizing diode DZ2 are the bi-directional voltage stabilizing diode of 1N4749A model.
3. the discharge loop of mine-used frequency-converter according to claim 1, is characterized in that: described discharge indicating lamp L1 is light-emitting diode; Discharge resistance R1, discharge resistance R2, discharge resistance R3 and discharge resistance R4 are noninductive resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877415.8U CN203691211U (en) | 2013-12-27 | 2013-12-27 | Discharge loop of mine-used frequency inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877415.8U CN203691211U (en) | 2013-12-27 | 2013-12-27 | Discharge loop of mine-used frequency inverter |
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| Publication Number | Publication Date |
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| CN203691211U true CN203691211U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320877415.8U Expired - Fee Related CN203691211U (en) | 2013-12-27 | 2013-12-27 | Discharge loop of mine-used frequency inverter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119474A (en) * | 2015-08-28 | 2015-12-02 | 洛阳中重自动化工程有限责任公司 | Explosion-proof frequency converter DC capacitor discharge system for mine elevator and method |
| CN107528311A (en) * | 2017-10-20 | 2017-12-29 | 陕西航空电气有限责任公司 | A kind of circuit for improving reliability in HVDC brushless motor controller power process |
| CN113300580A (en) * | 2021-03-26 | 2021-08-24 | 华夏天信智能物联股份有限公司 | Frequency converter discharging device |
| WO2022001953A1 (en) * | 2020-07-03 | 2022-01-06 | 苏州英途康医疗科技有限公司 | Battery pack with self-discharge function and electric tool |
-
2013
- 2013-12-27 CN CN201320877415.8U patent/CN203691211U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119474A (en) * | 2015-08-28 | 2015-12-02 | 洛阳中重自动化工程有限责任公司 | Explosion-proof frequency converter DC capacitor discharge system for mine elevator and method |
| CN105119474B (en) * | 2015-08-28 | 2019-03-15 | 洛阳中重自动化工程有限责任公司 | A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method |
| CN107528311A (en) * | 2017-10-20 | 2017-12-29 | 陕西航空电气有限责任公司 | A kind of circuit for improving reliability in HVDC brushless motor controller power process |
| WO2022001953A1 (en) * | 2020-07-03 | 2022-01-06 | 苏州英途康医疗科技有限公司 | Battery pack with self-discharge function and electric tool |
| CN113300580A (en) * | 2021-03-26 | 2021-08-24 | 华夏天信智能物联股份有限公司 | Frequency converter discharging device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20211227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |