CN201957282U - Dummy load circuit of adapter for railway LED signal lamps - Google Patents
Dummy load circuit of adapter for railway LED signal lamps Download PDFInfo
- Publication number
- CN201957282U CN201957282U CN2011200011614U CN201120001161U CN201957282U CN 201957282 U CN201957282 U CN 201957282U CN 2011200011614 U CN2011200011614 U CN 2011200011614U CN 201120001161 U CN201120001161 U CN 201120001161U CN 201957282 U CN201957282 U CN 201957282U
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- China
- Prior art keywords
- capacitor
- dummy load
- field effect
- load circuit
- effect transistor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 28
- 230000005669 field effect Effects 0.000 claims abstract description 22
- 230000005674 electromagnetic induction Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Rectifiers (AREA)
Abstract
本实用新型提供一种铁路LED信号灯适配器假负载电路，它包括全波桥式整流电路、滤波电容C1、电容C、电感L和场效应管T，所述滤波电容C1的两端并联在所述全波桥式整流电路的两输出端，所述电容C与所述电感L并联，所述电容C一端连接所述场效应管T的漏极，所述全波桥式整流电路的两输出端分别连接所述电容C另一端和所述场效应管T的源极，所述场效应管T的栅极作为假负载电路的脉冲输入端。该假负载电路利用电磁感应线圈在铁性金属中产生磁滞发热的原理来满足点灯单元所需要的电流，实现了真正等效阻性的假负载，实现了与点灯单元的完美匹配，其具有结构简单、使用寿命长、匹配性好、使用灵活、可靠性高的优点。
The utility model provides a dummy load circuit for a railway LED signal lamp adapter, which includes a full-wave bridge rectifier circuit, a filter capacitor C1, a capacitor C, an inductance L and a field effect tube T, and the two ends of the filter capacitor C1 are connected in parallel to the The two output terminals of the full-wave bridge rectifier circuit, the capacitor C is connected in parallel with the inductor L, one end of the capacitor C is connected to the drain of the field effect transistor T, and the two output terminals of the full-wave bridge rectifier circuit The other end of the capacitor C is respectively connected to the source of the field effect transistor T, and the gate of the field effect transistor T is used as the pulse input end of the dummy load circuit. The dummy load circuit uses the principle of hysteresis heating generated by the electromagnetic induction coil in the ferrous metal to meet the current required by the lighting unit, and realizes a true equivalent resistive dummy load, and realizes a perfect match with the lighting unit. It has the advantages of simple structure, long service life, good matching, flexible use and high reliability.
Description
Technical field
The utility model relates to a kind of railway signal lamp adaptor, specifically, relates to a kind of railway LED signal lamp adapter dummy load circuit.
Background technology
Railway LED signal lamp adapter is an equipment between LED lamp holder and lighting unit; Lighting unit becomes the 220V AC signal into the 12V AC signal, is used for directly lighting original 25W incandescent lamp, under the normal condition, will flow through the alternating current of about 2A on the 12V AC line of lighting unit; But, make original 25W incandescent lamp into present LED signal lamp after because the glow frequency height of LED signal lamp, on the 12V AC line, only flow through the electric current of 0.25A, like this, railway LED signal lamp adapter just needs the dummy load of about 20W, to satisfy the current requirements of lighting unit; With the resistance load that rehearses, then there is short problem of life-span; With the electric capacity load that rehearses,,, can not be complementary with lighting unit though electric current can reach because the electric capacity capacitive is too big.
In order to solve the problem of above-mentioned existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, thereby a kind of simple in structure, long service life, matching is good, reliability is high railway LED signal lamp adapter dummy load circuit are provided.
The purpose of this utility model is to realize by following technical scheme: a kind of railway LED signal lamp adapter dummy load circuit, it comprises capacitor C, inductance L and field effect transistor T, wherein, described capacitor C is in parallel with described inductance L, described capacitor C one end connects the drain electrode of described field effect transistor T, and the grid of described field effect transistor T is as the pulse input end of dummy load circuit.
Based on above-mentioned, this railway LED signal lamp adapter dummy load circuit also comprises full-wave bridge rectifier circuit and filter capacitor C1, wherein, the two ends of described filter capacitor C1 are connected in parallel on two outputs of described full-wave bridge rectifier circuit, and two outputs of described full-wave bridge rectifier circuit connect the source electrode of the described capacitor C other end and described field effect transistor T respectively.
The utility model has substantive distinguishing features and progress with respect to prior art, specifically, the principle that this dummy load circuit utilizes electromagnetic induction coil to produce the magnetic hysteresis heating in the iron metal satisfies the needed electric current of lighting unit, realized the dummy load that real equivalence is resistive, realized Perfect Matchings with lighting unit; This dummy load circuit is by the inreal heat that directly produces of the electric current of inductance coil, so the working life of this dummy load circuit is in fact unrestricted; This dummy load circuit can change the size of dummy load by the ON time that changes field effect transistor, and it has simple in structure, long service life, matching is good, use is flexible, reliability is high advantage.
Description of drawings
Fig. 1 is an electrical block diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
As shown in Figure 1, a kind of railway LED signal lamp adapter dummy load circuit, it comprises full-wave bridge rectifier circuit, filter capacitor C1, capacitor C, inductance L and field effect transistor T, the two ends of described filter capacitor C1 are connected in parallel on two outputs of described full-wave bridge rectifier circuit, described capacitor C is in parallel with described inductance L, described capacitor C one end connects the drain electrode of described field effect transistor T, two outputs of described full-wave bridge rectifier circuit connect the source electrode of the described capacitor C other end and described field effect transistor T respectively, and the grid of described field effect transistor T is as the pulse input end of dummy load circuit; Described full-wave bridge rectifier circuit is made of diode D1, diode D2, diode D3, diode D4.
During work, send pulse signal to the grid of described field effect transistor T by the P3.7 pin of the microprocessor controller of adapter, so that circuit oscillation, and then produce magnetic hysteresis loss, satisfy the electric current needs of lighting unit.
Operation principle: the AC12V that sends here from lighting unit through filter capacitor C1 filtering, becomes direct voltage V again through behind the full-wave bridge rectifier circuit; When the signal of the grid of sending into field effect transistor T is high level, field effect transistor T conducting, voltage V rises by the electric current straight line of inductance L, and to the inductance L energy storage, ON time is long more, and the energy that is stored in inductance L is big more; When the level of the grid that is added in field effect transistor T is low level, field effect transistor T ends, and the electric current that stores in the inductance L charges to capacitor C, along with the change in voltage on the capacitor C, charging current is also changing, in fact form vibration at last, if inductance L, capacitor C is all lossless, then this vibration can be sustained, but the electric current in the inductance coil changes the magnetic field that will change, this magnetic field will produce very big magnetic hysteresis loss in the iron conductor, promptly produce heat, thereby makes the very fast decay of vibration; After next high level pulse arrives, carried out the energy exchange of a new round again; In this way in fact the equivalence generation the magnetic hysteresis dummy load of a resistive load effect.
Should be noted that at last: above embodiment only is not intended to limit in order to the explanation the technical solution of the utility model; Although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement embodiment of the present utility model; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200011614U CN201957282U (en) | 2011-01-05 | 2011-01-05 | Dummy load circuit of adapter for railway LED signal lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200011614U CN201957282U (en) | 2011-01-05 | 2011-01-05 | Dummy load circuit of adapter for railway LED signal lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201957282U true CN201957282U (en) | 2011-08-31 |
Family
ID=44501383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200011614U Expired - Fee Related CN201957282U (en) | 2011-01-05 | 2011-01-05 | Dummy load circuit of adapter for railway LED signal lamps |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201957282U (en) |
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2011
- 2011-01-05 CN CN2011200011614U patent/CN201957282U/en not_active Expired - Fee Related
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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: 20110831 Termination date: 20140105 |