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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- dummy load
- load circuit
- capacitor
- circuit
- bridge rectifier
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Abstract
The utility model provides a dummy load circuit of an adapter for railway LED signal lamps. The dummy load circuit comprises a full-wave bridge rectifier circuit, a filter capacitor C1, a capacitor C2, an inductor L and a field-effect tube T, two ends of the filter capacitor C1 are connected to two output ends of the full-wave bridge rectifier circuit in parallel, the capacitor C is connected with the inductor L in parallel, one end of the capacitor C is connected with a drain electrode of the field-effect tube T, two output ends of the full-wave bridge rectifier circuit are respectively connected with the other end of the capacitor C and a source electrode of the field-effect tube T, and a grid electrode of the field-effect tube T serves as a pulse input end of the dummy load circuit. Requirement on circuit for a lighting unit is met by the dummy load circuit according to the principle that magnetic induction coils in iron is subjected to hysteresis heating so that dummy load with real equivalent resistance is implemented, and perfect matching of the dummy load circuit and the lighting unit is realized. Further, the dummy load circuit has the advantages of simple structure, long service life, fine matching performance, flexibility in 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)
1. railway LED signal lamp adapter dummy load circuit, it is characterized in that: this railway LED signal lamp adapter dummy load circuit 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.
2. railway LED signal lamp adapter dummy load circuit according to claim 1, it is characterized in that: 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.
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) |
-
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 |