CN202084922U - Direct-current power system adopting filter and piezoresistors - Google Patents
Direct-current power system adopting filter and piezoresistors Download PDFInfo
- Publication number
- CN202084922U CN202084922U CN2011201786808U CN201120178680U CN202084922U CN 202084922 U CN202084922 U CN 202084922U CN 2011201786808 U CN2011201786808 U CN 2011201786808U CN 201120178680 U CN201120178680 U CN 201120178680U CN 202084922 U CN202084922 U CN 202084922U
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- power
- piezoresistors
- filter
- piezo
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Abstract
The utility model discloses a direct-current power system adopting a filter and piezoresistors, which comprises high frequency modules in parallel connection and circuit breakers providing working power for the high frequency modules. The filter is connected onto a line from a power source to the high frequency modules, and the high frequency modules are connected with the piezoresistors in parallel. When the power source is unstable or when a certain phase of the power source fluctuates, the filter blocks high frequencies, the piezoresistors distribute excessive voltage to an earth pole or realize direct break-over, and the circuit breakers realize tripping protection, so that the purpose of protecting a power module and other direct-current devices is achieved. When the piezoresistors act, loss of components due to burning is avoided, the system can still operate, operation cost is reduced, and the direct-current power system brings great convenience for maintenance and operation of a power transformation system and leads a direct-current screen to be applied more widely.
Description
Technical field
The utility model relates to DC power system, particularly is applied in the spread of voltage zone, as the three-phase dc high-frequency rectification power-supply system of the railway system.
Background technology
Along with the continuous development of DC power supply, its application is also being widened, and its figure is all arranged in fields such as electric power, oil, chemical industry, metallurgy, railway, skyscrapers.Widening of application surface brought higher requirement to the environment for use of direct current cabinet, and be as shown in table 1:
Table 1: the environmental requirement of DC power supply
Wherein the operating voltage of direct current cabinet has played influence to a certain degree to interior arrangement and components and parts life-span, high-frequency rectification module particularly, when operating voltage instability or frequency fluctuation, loss on the diode is increased severely, cause charger to damage and to export galvanic current, even burn components and parts such as rectifier diode, can't export.General direct current cabinet does not dispose inlet wire filtering and secondary lightning protection, does not reach instructions for use, and shortcoming is as follows: the damage that (1) produces when primary voltage fluctuates, keep in repair very inconvenient; (2) operation to transformer station causes potential safety hazard, has increased operating cost and unreliability; (3) reserve battery is limited service time, and do not catch up with service time far away, influences long-time running.
The utility model content
At the problems referred to above, the utility model provides a kind of DC power system that adopts filter and piezo-resistance, can work as to protect when peak voltage appears in phase voltage or line voltage and mainly use power supply.
The technical solution of the utility model is as follows:
A kind of DC power system that adopts filter and piezo-resistance, comprise high-frequency model in parallel, and, being connected with filter on the circuit of described power supply tremendously high frequency module for described high-frequency model provides the circuit breaker of working power, described high-frequency model is in parallel with piezo-resistance.
Its further technical scheme is: described piezo-resistance has 6, and wherein 3 triangles connect other 3 Y-connections.
And its further technical scheme is: described high-frequency model is in parallel with lightning arrester.
Useful technique effect of the present utility model is:
The utility model is when power supply is unstable or during a certain phase power-supply fluctuation, the filter blocks high frequency, and the voltage that piezo-resistance will exceed is assigned to region, perhaps directly conducting, the circuit breaker trip protection is to reach the purpose of protection power module and other flow directing devices.When piezo-resistance is moved, avoided burning out the loss of components and parts, system still can move work, has reduced operating cost, for the maintenance and the operation of power transformation system brings great convenience.Make the application surface of direct current cabinet wider.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
As shown in Figure 1, the utility model comprises the high-frequency model of two parallel connections, a main breaker is controlled total break-make of described two high-frequency model working powers, and two branch circuit breakers are controlled the break-make (the also available fuse of the circuit breaker in the present embodiment substitutes) of described two high-frequency model working powers respectively.The difference of the utility model and prior art is to have overvoltage and high-frequency harmonic defencive function, and this function is realized by 6 piezo-resistances and a filter.Described filter is connected after the main breaker, and the working power of high-frequency model is provided behind filter filtering by circuit breaker like this.Described piezo-resistance has 6, and wherein 3 380V piezo-resistances are connected to one group with triangle, and other 3 220V piezo-resistances are one group with Y-connection.This two groups of piezo-resistances combination is in parallel with two high-frequency models, and line voltage and phase voltage are monitored, provides guarantee to the security of operation of equipment.Described two high-frequency models are also in parallel with a lightning arrester.
Below principle of the present utility model is described:
Inlet wire filtering is to prevent that the electrical network sudden change from being a very important link, and the rectification circuit of universal frequency converter is made up of the three-phase bridge rectification bridge.Its function is that power frequency supply is carried out rectification, provides required DC power supply for inverter circuit and control circuit behind the flat ripple of intermediate dc link.Three-phase alternating-current supply generally need be introduced the input of rectifier bridge through absorbing electric capacity and piezo-resistance network.The effect of piezo-resistance network is high-frequency harmonic signal and the overvoltage surge that absorbs AC network, thereby avoids damaging therefrom frequency converter.When supply voltage was three-phase 380V, the inverse peak voltage of rectifying device was generally 1200-1600V, and the maximal integer mass flow electric current is the twice of frequency converter rated current.Filter is by the resistance high frequency effect of logical low frequency and the electric capacity absorbing high-frequency of magnetic ring coil, do not allow high-frequency electromagnetic disturb to import into and discharges.Provide clean voltage and stable power to power consumption equipment.
Piezo-resistance has three effects: one, and overvoltage protection; Two, anti-thunderbolt requirement; Three, the safety test needs.The piezo-resistance Zinc-oxide piezoresistor claims surge absorber again, is a kind of pressure-sensitive attribute resistor with electric current and voltage symmetry characteristic.Its main design is to be used for protecting all electronic products or element to avoid being subjected to switch or thunderbolt to bring out the influence of the surging that produces; and the characteristic of its nonlinear exponent and range of application widely and can volume production etc. advantage, little by little be used in the electronic engineering aspect of various different field.Piezo-resistance is connected in parallel in the circuit, it is to voltage ratio responsive (reaching certain unusual high voltage), it is equivalent to insulator in normal working voltage, resistance moment change is very little when electric voltage exception is big, electric current is back to front end, the pull end fuse through piezo-resistance.If the big time of voltage ratio long self also moment punctures.Piezo-resistance is utilized the non-characteristic of piezo-resistance, and when overvoltage appears at piezo-resistance two interpolars, piezo-resistance can be with voltage clamp to a relatively-stationary magnitude of voltage, thereby realizes the protection to late-class circuit.
When power supply is unstable or during a certain phase power-supply fluctuation, the filter blocks high frequency, the voltage that piezo-resistance will exceed is assigned to region, perhaps directly conducting, the circuit breaker trip protection is to reach the purpose of protection power module and other flow directing devices.When piezo-resistance is moved, avoided burning out the loss of components and parts, system still can move work, has reduced operating cost, for the maintenance and the operation of power transformation system brings great convenience.Make the application surface of direct current cabinet wider.
Above-described only is preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from spirit of the present utility model and design, all should think to be included within the protection range of the present utility model.
Claims (3)
1. DC power system that adopts filter and piezo-resistance, comprise high-frequency model in parallel, and for described high-frequency model provides the circuit breaker of working power, it is characterized in that: be connected with filter on the circuit of described power supply tremendously high frequency module, described high-frequency model is in parallel with piezo-resistance.
2. according to the DC power system of described employing filter of claim 1 and piezo-resistance, it is characterized in that: described piezo-resistance has 6, and wherein 3 triangles connect other 3 Y-connections.
3. according to the DC power system of described employing filter of claim 1 and piezo-resistance, it is characterized in that: described high-frequency model is in parallel with lightning arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201786808U CN202084922U (en) | 2011-05-31 | 2011-05-31 | Direct-current power system adopting filter and piezoresistors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201786808U CN202084922U (en) | 2011-05-31 | 2011-05-31 | Direct-current power system adopting filter and piezoresistors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202084922U true CN202084922U (en) | 2011-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201786808U Expired - Fee Related CN202084922U (en) | 2011-05-31 | 2011-05-31 | Direct-current power system adopting filter and piezoresistors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202084922U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117090757A (en) * | 2023-08-10 | 2023-11-21 | 上海汉钟精机股份有限公司 | Vacuum pump control method with action maintaining function |
-
2011
- 2011-05-31 CN CN2011201786808U patent/CN202084922U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117090757A (en) * | 2023-08-10 | 2023-11-21 | 上海汉钟精机股份有限公司 | Vacuum pump control method with action maintaining function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111221 Termination date: 20140531 |