CN105119474A - Explosion-proof frequency converter DC capacitor discharge system for mine elevator and method - Google Patents
Explosion-proof frequency converter DC capacitor discharge system for mine elevator and method Download PDFInfo
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- CN105119474A CN105119474A CN201510538426.7A CN201510538426A CN105119474A CN 105119474 A CN105119474 A CN 105119474A CN 201510538426 A CN201510538426 A CN 201510538426A CN 105119474 A CN105119474 A CN 105119474A
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Abstract
The invention relates to the explosion-proof frequency converter technology field and discloses an explosion-proof frequency converter DC capacitor discharge system for a mine elevator and a method. The explosion-proof frequency converter DC capacitor discharge system comprises a discharge circuit 3, a rectification circuit 1, a pre-charging circuit 4, a DC side storage energy circuit 2, and a control circuit 5. A first input terminal of the DC side energy storage circuit is connected to the rectification circuit 1; the first input terminal is connected to the pre-charging circuit 4; the output terminal of the DC side storage circuit 8 is connected to the discharge circuit 9; the discharge circuit 3 consists of a vacuum contact device KM and a small power high voltage resistance resistor R which are electrically connected; and the two ends of the discharge circuit are connected to the anode and the DC cathode of the DC side in parallel. The invention can prevent a series of unsafe phenomenon, and is simple in structure, small in resistor power and short in discharging.
Description
Technical field
The present invention relates to explosion-proof frequency converter technical field, especially relate to a kind of mine hoist explosion-proof frequency converter DC capacitor discharge system of underground coal mine and method.
Background technology
At present, explosion-proof frequency converter is as a kind of novel energy-saving environment-friendly product, more and more general in the application in the inflammable and explosive property such as underground coal mine, dust atmosphere place.According to the technological requirement of mine hoist, also need to realize four quadrant running while speed governing.But, underground coal mine bad environments, hot and humid, and to space and safety requirements extremely harsh, explosion-proof frequency converter should realize flame proof to ensure safety, realizes frequency control performance again, to meet technological requirement and energy-saving index, temperature rise, EMC, reliability, installation and maintenance simplification, body hold the problems such as ratio, speed ratio and have become the short slab of product design, especially be applied in mine hoist occasion, if these short slabs process bad, very big hidden danger will be brought to Safety of Coal Mine Production.
According to the requirement of underground coal mine peace mark, after capacitor power-off, decap should meet GB3836.1 6.3.a and specifies.Capacitor discharge should be not more than 10 minutes to dump energy (0.2mJ) required time, and frequency converter is powered down to decap interval must be greater than time needed for capacitor discharge to dump energy.
At present, domestic manufacturer all adopts parallel resistance discharge mode always, or arranges artificial discharge circuit, and its shortcoming is that resistor power is large, heating is serious, easily misoperation, failure rate is high, discharge time is long.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention proposes a kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method, a series of dangerous phenomenons such as misoperation can be avoided to occur.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system, comprise: discharge circuit 3, rectification circuit 1, pre-charge circuit 4, DC side accumulator 2, control circuit 5, described DC side accumulator 8 first input end is connected with rectification circuit 1, first input end is connected with pre-charge circuit 4, and DC side accumulator 8 output is connected with discharge circuit 9; Described discharge circuit 3 is by vacuum contactor KM(3.1) be electrically connected to form with the high pressure resistant resistance R of small-power, the two ends of discharge circuit are directly parallel in DC side positive and negative electrode two ends; Wherein, the signal end of rectification circuit 1 is connected with the signal end of pre-charge circuit 4; The signal end of pre-charge circuit 4, DC side accumulator 2, discharge circuit 3 is connected with control circuit 11.
Adopt a method for mine hoist explosion-proof frequency converter DC capacitor discharge system discharge and recharge safety interlocking, its step is as follows:
When frequency converter power on start working time, control circuit (5) sends control signal, electromagnetic action is relied on to make vacuum contactor (3-1) remain open state, and then DC side positive bus-bar, contactor, resistance, DC side negative busbar form loop disconnect, stop electric discharge, and by the signal feedback of discharge circuit (3) and rectification circuit (1), pre-charge circuit (4), DC energy storage circuit (2) to control circuit (5), software is utilized to carry out safety interlock, discharge circuit work when forbidding frequency converter to work;
When frequency converter quits work, mechanical device is relied on to make vacuum contactor KM keep conducting state, and then DC side positive bus-bar, vacuum contactor (3.1), the high pressure resistant resistance of small-power (3.2), DC side negative busbar formation discharge loop, discharge.
Owing to adopting technical scheme as above, of the present invention have following superiority:
A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method, a series of dangerous phenomenons such as misoperation can be avoided to occur, and its structure is simple, resistor power is little, discharge time is short.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is explosion-proof frequency converter DC capacitor discharge system circuit block diagram.
1. rectification circuits, 2. DC energy storage circuit, 3. discharge circuit, the special vacuum contactor of 3-1., the high pressure resistant resistance of 3-2. small-power, 4. pre-charge circuit, 5. control circuit in figure.
Embodiment
This discharge circuit is directly parallel in DC side positive and negative end, discharge circuit is made up of special vacuum contactor and the high pressure resistant resistance of small-power, wherein special vacuum contactor is entirely independent development, vacuum contactor is made to keep conducting state when frequency converter quits work by mechanical device, and then DC side positive bus-bar, contactor, resistance, DC side negative busbar forms path and discharges, vacuum contactor is made to remain open state when frequency converter works by electromagnetic action, and then DC side positive bus-bar, contactor, resistance, the loop that DC side negative busbar is formed disconnects, stop electric discharge, and by discharge circuit and rectification circuit, pre-charge circuit, the signal feedback of DC side accumulator is to control circuit, software is utilized to carry out safety interlock, discharge circuit work when forbidding frequency converter to work.
In FIG, jointly form DC capacitor discharge system by rectification circuit (1), pre-charge circuit (4), DC energy storage circuit (2), control circuit (5) and discharge circuit (3), wherein discharge circuit (3) is made up of the positive and negative bus of DC side, special vacuum contactor (3-1) and the high pressure resistant resistance of small-power (3-2).
When frequency converter power on start working time, control circuit (5) sends control signal, electromagnetic action is relied on to make special vacuum contactor (3-1) remain open state, and then DC side positive bus-bar, contactor, resistance, DC side negative busbar form loop disconnect, stop electric discharge, and by the signal feedback of discharge circuit (3) and rectification circuit (1), pre-charge circuit (4), DC energy storage circuit (2) to control circuit (5), software is utilized to carry out safety interlock, discharge circuit work when forbidding frequency converter to work.When frequency converter quits work, rely on mechanical device make vacuum contactor keep conducting state, and then DC side positive bus-bar, special vacuum contactor (3-1), the high pressure resistant resistance of small-power (3-2), DC side negative busbar form path discharge.
Claims (2)
1. a mine hoist explosion-proof frequency converter DC capacitor discharge system, it is characterized in that: comprising: discharge circuit 3, rectification circuit 1, pre-charge circuit 4, DC side accumulator 2, control circuit 5, described DC side accumulator 8 first input end is connected with rectification circuit 1, first input end is connected with pre-charge circuit 4, and DC side accumulator 8 output is connected with discharge circuit 9; Described discharge circuit 3 is by vacuum contactor KM(3.1) be electrically connected to form with the high pressure resistant resistance R of small-power, the two ends of discharge circuit are directly parallel in DC side positive and negative electrode two ends; Wherein, the signal end of rectification circuit 1 is connected with the signal end of pre-charge circuit 4; The signal end of pre-charge circuit 4, DC side accumulator 2, discharge circuit 3 is connected with control circuit 11.
2. adopt the discharge and recharge safety interlocking method of a kind of mine hoist explosion-proof frequency converter DC capacitor discharge system described in claim 1, it is characterized in that: its step is as follows:
When frequency converter power on start working time, control circuit (5) sends control signal, electromagnetic action is relied on to make vacuum contactor (3-1) remain open state, and then DC side positive bus-bar, contactor, resistance, DC side negative busbar form loop disconnect, stop electric discharge, and by the signal feedback of discharge circuit (3) and rectification circuit (1), pre-charge circuit (4), DC energy storage circuit (2) to control circuit (5), software is utilized to carry out safety interlock, discharge circuit work when forbidding frequency converter to work;
When frequency converter quits work, mechanical device is relied on to make vacuum contactor KM keep conducting state, and then DC side positive bus-bar, vacuum contactor (3.1), the high pressure resistant resistance of small-power (3.2), DC side negative busbar formation discharge loop, discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510538426.7A CN105119474B (en) | 2015-08-28 | 2015-08-28 | A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method |
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| CN201510538426.7A CN105119474B (en) | 2015-08-28 | 2015-08-28 | A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method |
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| CN105119474A true CN105119474A (en) | 2015-12-02 |
| CN105119474B CN105119474B (en) | 2019-03-15 |
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| CN105119474B (en) | 2019-03-15 |
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