CN105119474B - A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method - Google Patents
A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method Download PDFInfo
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- CN105119474B CN105119474B CN201510538426.7A CN201510538426A CN105119474B CN 105119474 B CN105119474 B CN 105119474B CN 201510538426 A CN201510538426 A CN 201510538426A CN 105119474 B CN105119474 B CN 105119474B
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Abstract
The present invention relates to explosion-proof frequency converter technical fields, disclosed a kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method, it include: discharge circuit 3, rectification circuit 1, pre-charge circuit 4, DC side accumulator 2, control circuit 5,8 first input end of DC side accumulator is connected with rectification circuit 1, first input end is connected with pre-charge circuit 4, and 8 output end of DC side accumulator is connected with discharge circuit 9；The discharge circuit 3 is electrically connected to form by vacuum contactor KM and the high pressure resistant resistance R of small-power, and the both ends of discharge circuit are directly parallel in DC side positive and negative electrode both ends；The present invention can be avoided a series of dangerous phenomenons such as maloperation and occur, and structure is simple, resistor power is small, discharge time is short.
Description
Technical field
The present invention relates to explosion-proof frequency converter technical fields, more particularly, to a kind of explosion-proof change of mine hoist of underground coal mine
Frequency device DC capacitor discharge system and method.
Background technique
Currently, explosion-proof frequency converter is as a kind of novel energy-saving environment-friendly product, it is inflammable and explosive in underground coal mine, dust atmosphere etc.
Property place using more and more common.It is required according to the technique of mine hoist, also needs to realize four-quadrant while speed regulation
Operation.However, underground coal mine bad environments, high temperature and humidity, and it is extremely harsh to space and safety requirements, explosion-proof frequency converter should
Realize flame proof to guarantee safety, again realize frequency control performance, with meet technique require and energy-saving index, temperature rise, EMC, can
The problems such as holding ratio, speed ratio by property, installation maintenance simplification, body at the short slab of product design, is especially applied and mentions in mine
It rises airport to close, if these short slab processing are bad, very big hidden danger will be brought to Safety of Coal Mine Production.
Pacify mark according to underground coal mine to require, the time of uncapping after capacitor power-off should meet GB3836.1 6.3.a regulation.
It should be not more than 10 minutes the time required to capacitor discharge to dump energy (0.2mJ), frequency converter is powered down to time interval palpus of uncapping
Greater than the time needed for capacitor discharge to dump energy.
Currently, domestic manufacturer is all made of parallel resistance discharge mode always, or the artificial discharge circuit of setting, the disadvantage is that
Resistor power is big, serious, the easy maloperation of fever, high failure rate, discharge time are long.
Summary of the invention
For overcome the deficiencies in the prior art, the invention proposes a kind of mine hoist explosion-proof frequency converter DC capacitors
Discharge system and method can be avoided a series of dangerous phenomenons such as maloperation and occur.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system, comprising: discharge circuit 3, rectification circuit, pre-
Charging circuit, DC side accumulator, control circuit, 8 first input end of DC side accumulator are connected with rectification circuit,
First input end is connected with pre-charge circuit, and 8 output end of DC side accumulator is connected with discharge circuit；The discharge circuit by
Vacuum contactor KM is electrically connected to form with the high pressure resistant resistance R of small-power, and it is positive and negative that the both ends of discharge circuit are directly parallel in DC side
Pole both ends；Wherein, the signal end of rectification circuit is connected with the signal end of pre-charge circuit；Pre-charge circuit, DC side energy storage electricity
Road, discharge circuit signal end be connected with control circuit.
A method of using mine hoist explosion-proof frequency converter DC capacitor discharge system charge and discharge safety interlocking,
Steps are as follows:
When frequency converter powers on start-up operation, control circuit issues control signal, makes vacuum contactor by electromagnetic action
It remains off, and then the circuit that DC side positive bus-bar, contactor, resistance, DC side negative busbar are constituted disconnects, and stops putting
Electricity, and the signal of discharge circuit and rectification circuit, pre-charge circuit, DC energy storage circuit is fed back to control circuit (5), it utilizes
Software carries out safety interlock, and discharge circuit works when frequency converter being forbidden to work；
When frequency converter stops working, tend to remain on vacuum contactor KM by mechanical device, and then DC side
The high pressure resistant resistance of positive bus-bar, vacuum contactor, small-power, DC side negative busbar constitute discharge loop, discharge.
Due to the adoption of the technical scheme as described above, of the invention to have the following advantages:
A kind of mine hoist explosion-proof frequency converter DC capacitor discharge system and method, can be avoided a system such as maloperation
It arranges dangerous phenomenon to occur, structure is simple, resistor power is small, discharge time is short.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is explosion-proof frequency converter DC capacitor discharge system circuit block diagram.
1. rectification circuits, 2. DC energy storage circuits, 3. discharge circuits, the special vacuum contactor of 3-1., the small function of 3-2. in figure
The high pressure resistant resistance of rate, 4. pre-charge circuits, 5. control circuits.
Specific embodiment
The discharge circuit is directly parallel in DC side positive and negative end, and discharge circuit is by special vacuum contactor and small-power
High pressure resistant resistance is constituted, wherein special vacuum contactor is entirely independent development, mechanical device is leaned on when frequency converter stops working
Tend to remain on vacuum contactor, so DC side positive bus-bar, contactor, resistance, DC side negative busbar constitute access into
Row electric discharge remains off vacuum contactor by electromagnetic action when frequency converter work, and then DC side positive bus-bar, contact
The circuit disconnection that device, resistance, DC side negative busbar are constituted stops electric discharge, and discharge circuit and rectification circuit, precharge is electric
Road, DC side accumulator signal feed back to control circuit, using software carry out safety interlock, put when frequency converter being forbidden to work
Circuit work.
In Fig. 1, by rectification circuit (1), pre-charge circuit (4), DC energy storage circuit (2), control circuit (5) and electric discharge
Circuit (3) collectively forms DC capacitor discharge system, and wherein discharge circuit (3) is by the positive and negative bus of DC side, special vacuum contact
Device (3-1) and the high pressure resistant resistance of small-power (3-2) are constituted.
When frequency converter powers on start-up operation, control circuit (5) issues control signal, makes special vacuum by electromagnetic action
Contactor (3-1) remains off, and then the circuit that DC side positive bus-bar, contactor, resistance, DC side negative busbar are constituted is disconnected
Open, stop electric discharge, and by discharge circuit (3) and rectification circuit (1), pre-charge circuit (4), DC energy storage circuit (2) signal
Control circuit (5) are fed back to, carry out safety interlock using software, discharge circuit works when frequency converter being forbidden to work.Work as frequency converter
When stopping working, tend to remain on vacuum contactor by mechanical device, and then DC side positive bus-bar, special vacuum contact
Device (3-1), the high pressure resistant resistance of small-power (3-2), DC side negative busbar constitute access and discharge.
Claims (1)
1. a kind of charge and discharge safety interlocking method of mine hoist explosion-proof frequency converter DC capacitor discharge system, the mine of use
Well elevator explosion-proof frequency converter DC capacitor discharge system, comprising: discharge circuit (3), rectification circuit (1), pre-charge circuit
(4), DC energy storage circuit (2), control circuit (5), DC energy storage circuit (2) output end are connected with discharge circuit (3)；It is described to put
Circuit (3) is by vacuum contactor KM(3-1) and the high pressure resistant resistance R(3-2 of small-power) it is electrically connected to form, the both ends of discharge circuit
It is directly parallel in DC side positive and negative electrode both ends；Wherein, the signal end phase of the signal end of rectification circuit (1) and pre-charge circuit (4)
Even；Pre-charge circuit (4), DC energy storage circuit (2), discharge circuit (3) signal end be connected with control circuit (5)；Its feature
Be: its step are as follows:
When frequency converter powers on start-up operation, control circuit (5) issues control signal, makes vacuum contactor KM by electromagnetic action
(3-1) is remained off, and then the circuit that DC side positive bus-bar, contactor, resistance, DC side negative busbar are constituted disconnects, and stops
It only discharges, and discharge circuit (3) and the signal of rectification circuit (1), pre-charge circuit (4), DC energy storage circuit (2) is fed back to
Control circuit (5) carries out safety interlock using software, and discharge circuit works when frequency converter being forbidden to work；
When frequency converter stops working, make vacuum contactor KM(3-1 by mechanical device) it tends to remain on, and then DC side
Positive bus-bar, vacuum contactor KM(3-1), the high pressure resistant resistance R(3-2 of small-power), DC side negative busbar constitute discharge loop, carry out
Electric 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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| 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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| CN105119474A CN105119474A (en) | 2015-12-02 |
| CN105119474B true CN105119474B (en) | 2019-03-15 |
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| CN105119474A (en) | 2015-12-02 |
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