CN203466714U - Discharging circuit for intermediate support capacitor of frequency converter - Google Patents
Discharging circuit for intermediate support capacitor of frequency converter Download PDFInfo
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- CN203466714U CN203466714U CN201320575592.0U CN201320575592U CN203466714U CN 203466714 U CN203466714 U CN 203466714U CN 201320575592 U CN201320575592 U CN 201320575592U CN 203466714 U CN203466714 U CN 203466714U
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Abstract
Disclosed in the utility model is a discharging circuit for an intermediate support capacitor of a frequency converter. The discharging circuit that is connected in parallel with the intermediate support capacitor consists of a power supply, a power resistor group, a discharge resistor, a normally-closed contact high-voltage relay, a first light-emitting diode and a first resistor. The first light-emitting diode is connected in parallel with the first resistor to form an electric quantity display circuit; the power resistor group is connected in series with the electric quantity display circuit to form a first discharging branch circuit; the electric quantity display circuit is connected by a normally-closed contact of the normally-closed contact high-voltage relay and is connected in parallel with the first discharging branch circuit; and a coil of the normally-closed contact high-voltage relay is connected in parallel with the power supply. The provided discharging circuit has the advantages of fast discharging speed, simple structure, reasonable design, novel technology, security and reliability, and low cost and the like; the residual capacity of the intermediate support capacitor is displayed visually; and thus the maintenance personnel can carry out operation conveniently.
Description
Technical field
The utility model relates to discharge circuit, and a kind of discharge circuit for frequency converter intermediate supports electric capacity is provided especially.
Background technology
Along with Coal Industrial is for highly efficient and productive requirement, the technical development of coal-winning machine is in recent years maked rapid progress.The one, coal-winning machine installed power constantly increases, and in order to meet high strength and the high performance demands of coal-winning machine, the installed power of coal-winning machine (comprising cutting power and traction power) is all continuing to increase.The 2nd, control system is gradually improved, and the electrical control function of coal-winning machine is progressively complete, and reliability improves constantly, and universal, interchangeability and the aspect such as integrated are existing compared with much progress.The 3rd, domesticly progressively stop researching and developing hydraulic haulage shearer from early 1990s, research emphasis is turned to electrical haulage shearer, the latter has become the research emphasis of domestic coal-winning machine, and traction frequency convertor is the pith of electrical haulage shearer, major function is to control the walking of motor haulage shearer.
Yet intermediate supports electric capacity is the necessary condition of frequency converter work, its Main Function is to stablize middle dc voltage, and instantaneous energy exchange is provided, idle with power supply and load exchange.Electric capacity is energy-storage travelling wave tube, even if system cut-off still stores a certain amount of electric energy on electric capacity, wherein, electric capacity is larger, and stored electric weight is also just larger.And the intermediate supports electric capacity of frequency converter often arrives microfarads up to ten thousand several thousand, the electric weight of storing is very large, and voltage is also very high.
In coal industry, require after system cut-off, within a certain period of time, any parts in system must not be charged.National standard requires frequency converter intermediate supports capacitance decompression in power-off 10 minutes below 0.02V, therefore to require traction frequency convertor intermediate supports electric capacity must be equipped with discharge system, and do not have the product of this aspect at present.
Utility model content
Given this, the purpose of this utility model is to provide a kind of discharge circuit for frequency converter intermediate supports electric capacity, and to solve after frequency converter power-off in the past, intermediate supports electric capacity still cannot be depressured to the problem of safety value.
The discharge circuit for frequency converter intermediate supports electric capacity that the utility model provides, this discharge circuit and intermediate supports Capacitance parallel connection, is characterized in that: described discharge circuit comprises power supply, power resistor group, discharge resistance, normally-closed contact high-voltage relay, the first light-emitting diode and the first resistance; Described the first light-emitting diode is in parallel with the first resistance, forms electric quantity display circuit, and described power resistor group is connected with electric quantity display circuit, forms the first discharge paths; Described discharge resistance accesses by the normally-closed contact of normally-closed contact high-voltage relay, in parallel with the first discharge paths; The coil of described normally-closed contact high-voltage relay is in parallel with power supply.
Discharge circuit in the utility model, utilizes normally-closed contact high-voltage relay, carries out the discharge prevention of circuit.When energising, high-voltage relay coil obtains electric, and normally closed electric shock disconnects, and by the first discharge paths access frequency conversion main circuit, thereby guarantees once high-voltage relay fault, still can consume the dump energy in intermediate supports electric capacity by the first discharge paths; When power-off, high-voltage relay coil losing electricity, normally off is got back in electric shock, now after the first discharge paths and discharge resistance parallel connection, access main circuit of converter, for intermediate supports capacitor discharge, reach in official hour the voltage of intermediate supports electric capacity is dropped to below the voltage of permission, guarantee the fail safe of system., in discharge circuit, be also provided with for showing the first light-emitting diode of intermediate supports electric capacity dump energy meanwhile, can intuitively show the dump energy of intermediate supports electric capacity, safety, reliable.
Preferably, described discharge circuit also comprises the second Light-Emitting Diode and the second resistance; After described the second light-emitting diode is connected with the second resistance, in parallel with power supply; For showing the operating state of discharge circuit.
Further preferably, described discharge circuit also comprises the first diode, and described the first diode is in parallel with power supply, and the anode of described the first diode and the negative pole of power supply be connected, and the negative electrode of described the first diode is connected with the positive pole of power supply; By this place's design, carry out the protection of power supply.
Further preferably, the power of described power resistor group is 20 ~ 30W; Improve the velocity of discharge of discharge circuit.
Further preferably, described power resistor group consists of a plurality of power resistor units in series; Described power resistor unit consists of two power resistor parallel connections; By a plurality of low power resistance units, connect, thereby reduce the volume of discharge equipment.
Further preferably, the number of described power resistor unit is 4.
The discharge circuit for frequency converter intermediate supports electric capacity that the utility model provides, its advantage is: the velocity of discharge is fast, simple in structure, reasonable in design, technology is novel, safe and reliable, with low cost, can intuitively demonstrate the dump energy of intermediate supports electric capacity, maintain easily personnel's operation.
Accompanying drawing explanation
below in conjunction with drawings and the embodiments, the utility model is described in further detail:
Fig. 1 is the circuit diagram for the discharge circuit of frequency converter intermediate supports electric capacity.
Embodiment
Be illustrated in figure 1 a kind of discharge circuit for frequency converter intermediate supports electric capacity, in parallel by power resistor R1 and power resistor R2 parallel connection, power resistor R3 and power resistor R4 parallel connection, power resistor R5 and power resistor R6 parallel connection, power resistor R7 and power resistor R8, form four power resistor unit, after described power resistor units in series, form power resistor group; After the first light-emitting diode D1 is in parallel with the first resistance R 9, form electric quantity display circuit; Above-mentioned power resistor group forms the first discharge paths after connecting with electric quantity display circuit; Wherein, discharge resistance R10 accesses by the normally-closed contact of normally-closed contact high-voltage relay K, in parallel with the first discharge paths; The coil of described normally-closed contact high-voltage relay K is in parallel with power supply, finally forms discharge circuit, and this discharge circuit is in parallel with intermediate supports capacitor C, and middle Support Capacitor C is discharged.
Wherein, when the power of power resistor group is 20 ~ 30W, the velocity of discharge is better, and the number of concrete power resistor unit can be carried out concrete determining according to the power of discharge resistance.
As the improvement of technical scheme, discharge circuit is also provided with the second Light-Emitting Diode D2 and the second resistance R 11; After described the second light-emitting diode D2 connects with the second resistance R 11, U is in parallel with power supply; For showing the operating state of discharge circuit.
Its concrete course of work is as follows, discharge circuit is accessed in shearer haulage frequency converter, with intermediate supports Capacitance parallel connection, when energising, the second light-emitting diode is given out light, and high-voltage relay coil obtains electric, normally-closed contact disconnects, now, the first lumination of light emitting diode, indicates in intermediate supports electric capacity and has sufficient electric weight; When power-off, the second light-emitting diode extinguishes, high-voltage relay coil losing electricity, normally-closed contact is got back to normally off, now, and in the first discharge paths and discharge resistance access in parallel main circuit, for intermediate supports capacitor discharge, when the first light-emitting diode extinguishes gradually, represent that the dump energy in intermediate supports electric capacity is constantly being consumed, until voltage drops to below the safe voltage of permission.
For power supply is protected; improvement as technical scheme; in discharge circuit, be also provided with the first diode D3; described the first diode D3 is in parallel with power supply U; and the anode of described the first diode D3 is connected with the negative pole of power supply U, the negative electrode of described the first diode D3 is connected with the positive pole of power supply U.
In order to improve the velocity of discharge of discharge circuit, as the improvement of technical scheme, the power of described power resistor group is 20 ~ 30W.
Embodiment in the utility model is to write according to the form of going forward one by one, and highlights the difference in each embodiment, and its similar part can cross-references.
By reference to the accompanying drawings execution mode of the present utility model is described in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (6)
1. the discharge circuit for frequency converter intermediate supports electric capacity, this discharge circuit and intermediate supports Capacitance parallel connection, is characterized in that: described discharge circuit comprises power supply, power resistor group, discharge resistance, normally-closed contact high-voltage relay, the first light-emitting diode and the first resistance; Described the first light-emitting diode is in parallel with the first resistance, forms electric quantity display circuit, and described power resistor group is connected with electric quantity display circuit, forms the first discharge paths; Described discharge resistance accesses by the normally-closed contact of normally-closed contact high-voltage relay, in parallel with the first discharge paths; The coil of described normally-closed contact high-voltage relay is in parallel with power supply.
According to described in claim 1 for the discharge circuit of frequency converter intermediate supports electric capacity, it is characterized in that: described discharge circuit also comprises the second Light-Emitting Diode and the second resistance; After described the second light-emitting diode is connected with the second resistance, in parallel with power supply.
According to described in claim 1 or 2 for the discharge circuit of frequency converter intermediate supports electric capacity, it is characterized in that: described discharge circuit also comprises the first diode, described the first diode is in parallel with power supply, and the anode of described the first diode is connected with the negative pole of power supply, the negative electrode of described the first diode is connected with the positive pole of power supply.
According to described in claim 1 for the discharge circuit of frequency converter intermediate supports electric capacity, it is characterized in that: the power of described power resistor group is 20 ~ 30W.
According to described in claim 1 for the discharge circuit of frequency converter intermediate supports electric capacity, it is characterized in that: described power resistor group consists of a plurality of power resistor units in series; Described power resistor unit consists of two power resistor parallel connections.
According to described in claim 5 for the discharge circuit of frequency converter intermediate supports electric capacity, it is characterized in that: the number of power resistor unit is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320575592.0U CN203466714U (en) | 2013-09-17 | 2013-09-17 | Discharging circuit for intermediate support capacitor of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320575592.0U CN203466714U (en) | 2013-09-17 | 2013-09-17 | Discharging circuit for intermediate support capacitor of frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN203466714U true CN203466714U (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320575592.0U Expired - Fee Related CN203466714U (en) | 2013-09-17 | 2013-09-17 | Discharging circuit for intermediate support capacitor of frequency converter |
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| CN (1) | CN203466714U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104924909A (en) * | 2015-06-02 | 2015-09-23 | 金龙联合汽车工业（苏州）有限公司 | High-voltage residual electricity discharging system of electric car |
-
2013
- 2013-09-17 CN CN201320575592.0U patent/CN203466714U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104924909A (en) * | 2015-06-02 | 2015-09-23 | 金龙联合汽车工业（苏州）有限公司 | High-voltage residual electricity discharging system of electric car |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140305 Termination date: 20160917 |