CN205596403U - Rail vehicle carriage LED lighting driver power - Google Patents
Rail vehicle carriage LED lighting driver power Download PDFInfo
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- CN205596403U CN205596403U CN201620360291.XU CN201620360291U CN205596403U CN 205596403 U CN205596403 U CN 205596403U CN 201620360291 U CN201620360291 U CN 201620360291U CN 205596403 U CN205596403 U CN 205596403U
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- driving chip
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a rail vehicle carriage LED lighting driver power belongs to emitting diode power drive technical field. It includes driver chip PT4107, surge protection circuit, electromagnetic compatibility wave filter, rectification filter circuit, power factor correction circuit, step -down voltage stabilizing circuit and is just swashing formula DCDC converter. The electromagnetic compatibility wave filter passes through the surge protection circuit links to each other with AC input, comes the electromagnetic interference among the suppression circuit, rectification filter circuit links to each other with electromagnetic compatibility filter output end, carries out DC conversion to the alternating current, step -down voltage stabilizing circuit uses for the driver chip PT4107 power supply simultaneously the power factor correction circuit improves power efficiency, under driver chip's control, the process after just swashing the transform of formula DCDC converter, form the steady voltage direct current of specific voltage, supply the LED illumination. The utility model discloses a closed -loop control principle and PWM pulse width modulation mode, the reliability is high, LED is luminous stable, energy -conserving.
Description
Technical field:
The invention discloses a kind of railway carriage LED illumination and drive power supply, belong to LED power source and drive
Dynamic (LED illumination driving power supply) technical field.
Background technology:
Along with improving constantly of rail vehicle overall technology level, the requirement to illuminator is more and more higher, passes
The general illumination system of system, such as electric filament lamp and fluorescent lamp etc., their energy loss is very big, can not meet
Rail vehicle is to illumination energy saving of system, the design requirement of environmental protection.And the topmost advantage of LED illumination lamp is exactly
Energy-conservation, service life is long.Therefore LED illumination System applied research on the rail vehicle has become as concern
Focus, LED extensive application on the rail vehicle has become common recognition.
Owing to LED has the unidirectional general character, V-I curve has non-linear, and pressure drop varies with temperature relatively big, sends out
Light intensity is with features such as curent change are bigger, and therefore it can not directly use the alternating voltage of rail vehicle, it is necessary to
Utilizing special power supply, the unidirectional current that alternating current in rail vehicle is converted into specific voltage could be at rail vehicle
Compartment uses.In consideration of it, a kind of railway carriage LED illumination drives power supply to be to be badly in need of in the industry.
It is an advantage of the current invention that have employed loop control theory and PWM pulse width modulation mode, reliability is high,
LED stable luminescence, energy-conservation.
Summary of the invention:
One railway carriage LED illumination of the present invention drives power supply, overcomes in rail vehicle LED not
Can directly use the problem of alternating voltage in compartment, not only meet LED illumination requirement, also meet control and want
Ask, and there is dimming function.
The technical scheme is that a kind of railway carriage LED illumination drives power supply to be by surge protection electricity
Road (1), Electro Magnetic Compatibility wave filter (2), current rectifying and wave filtering circuit (3), circuit of power factor correction (4),
Decompression voltage regulator (5), positive activation type DC/DC changer (6), driving chip PT4107 (7) forms.
Wherein, the 220V alternating current of input, after described surge protection circuit (1), connects described Electro Magnetic Compatibility
The input of wave filter (2), Electro Magnetic Compatibility wave filter (2) is used in suppression circuit the electromagnetic interference produced；
The input of described current rectifying and wave filtering circuit (3) is connected, by electricity with the outfan of Electro Magnetic Compatibility wave filter (2)
Pressure carries out rectifying and wave-filtering, and converts thereof into the unidirectional current of about 310V；Described circuit of power factor correction (4)
Input be connected with the outfan of described current rectifying and wave filtering circuit (3), outfan and described driving chip PT4107
(7) GND foot is connected, and the electric current containing spike changes into the electric current of approximate sine wave, and then makes
The power factor of power supply is greatly improved；The input of described decompression voltage regulator (5) and described current rectifying and wave filtering circuit
(3) outfan is connected, and outfan is connected with the VIN foot of described driving chip PT4107 (7), described
The unidirectional current that current rectifying and wave filtering circuit (3) can be produced by decompression voltage regulator (5) carries out blood pressure lowering and filtering, for
Described driving chip PT4107 (7) is powered；Described positive activation type DC/DC changer (6) have an input,
One controls end and an output current sample end, the outfan phase of input and described current rectifying and wave filtering circuit (3)
Even, control end and be connected with the GATE foot of described driving chip PT4107 (7), the GATE foot of driving chip
For controlling the electric current of LED drive power output, the CS foot of described driving chip PT4107 (7) and output
Current sample end is connected, and for receiving the current signal of LED, positive activation type DC/DC changer (6) is driving
It is turned on and off under the effect of the GATE end pulse voltage of dynamic chip PT4107 (7), thus forms certain electric
The direct current of voltage regulation of pressure.
The present invention compared with prior art, has the following advantages that and good effect: high reliability, high efficiency,
High Power Factor, energy-conservation, there is surge protection function, LED illumination drives power source life long, and have employed
PWM pulse modulation technology, had both ensured that LED was in the conduction state, did not the most cause its spectral wavelength to drift about,
Make LED stabilized illumination.
Accompanying drawing illustrates:
Fig. 1 is that a kind of railway carriage LED illumination drives power supply integrated circuit figure
Fig. 2 is surge protection circuit figure in Fig. 1 of the present invention
Fig. 3 is Electro Magnetic Compatibility filter circuit figure in Fig. 1 of the present invention
Fig. 4 is current rectifying and wave filtering circuit figure in Fig. 1 of the present invention
Fig. 5 is circuit of power factor correction figure in Fig. 1 of the present invention
Fig. 6 is decompression voltage regulator figure in Fig. 1 of the present invention
Fig. 7 is positive activation type DC/DC converter circuit figure in Fig. 1 of the present invention
Fig. 8 is driving chip PT4107 encapsulation figure in Fig. 1 of the present invention
Fig. 9 is output voltage signal simulation result figure in Fig. 1 of the present invention
Figure 10 is output current signal simulation result figure in Fig. 1 of the present invention
Detailed description of the invention:
As it is shown in figure 1, a kind of railway carriage LED illumination drives power supply to be by surge protection circuit (1),
Electro Magnetic Compatibility wave filter (2), current rectifying and wave filtering circuit (3), circuit of power factor correction (4), blood pressure lowering is steady
Volt circuit (5), positive activation type DC/DC changer (6), driving chip PT4107 (7) forms.Wherein,
The 220V alternating current of input, after described surge protection circuit (1), connects described Electro Magnetic Compatibility wave filter
(2) input, Electro Magnetic Compatibility wave filter (2) is used in suppression circuit the electromagnetic interference produced；Described
The input of current rectifying and wave filtering circuit (3) is connected with the outfan of Electro Magnetic Compatibility wave filter (2), is entered by voltage
Row rectifying and wave-filtering, and convert thereof into the unidirectional current of about 310V；Described circuit of power factor correction (4)
Input is connected with the outfan of described current rectifying and wave filtering circuit (3), outfan and described driving chip PT4107
(7) GND foot is connected, and the electric current containing spike changes into the electric current of approximate sine wave, and then makes
The power factor of power supply is greatly improved；The input of described decompression voltage regulator (5) and described current rectifying and wave filtering circuit
(3) outfan is connected, and outfan is connected with the VIN foot of described driving chip PT4107 (7), described
The unidirectional current that current rectifying and wave filtering circuit (3) can be produced by decompression voltage regulator (5) carries out blood pressure lowering and filtering, for
Described driving chip PT4107 (7) is powered；Described positive activation type DC/DC changer (6) have an input,
One controls end and an output current sample end, the outfan phase of input and described current rectifying and wave filtering circuit (3)
Even, control end and be connected with the GATE foot of described driving chip PT4107 (7), the GATE foot of driving chip
For controlling the electric current of LED drive power output, the CS foot of described driving chip PT4107 (7) and output
Current sample end is connected, and for receiving the current signal of LED, positive activation type DC/DC changer (6) is driving
It is turned on and off under the effect of the GATE end pulse voltage of dynamic chip PT4107 (7), thus forms certain electric
The direct current of voltage regulation of pressure.
As in figure 2 it is shown, described surge protection circuit (1) is made up of electric fuse F1 and critesistor NTC,
The specification of electric fuse F1 is 250V/1A.Generally have higher than normal current manyfold in the moment switched on power
Surge current, the critesistor NTC resistance value when starting is very big, therefore can suppress this electric current, from
And LED driver and LED can be protected.Described surge protection circuit (1) is possible to prevent in AC network
Surge current.
As it is shown on figure 3, described Electro Magnetic Compatibility wave filter (2) is by common mode inductance L2, L3 and differential mode capacitor
CX1 forms.Limit, source meets differential mode capacitor CX1, can eliminate the harassing and wrecking of circuit high frequency, and load limit meets inductance L2
And L3, the series connection of two inductance can play filter effect in the line, and the inductance value of inductance L2, L3 is 2.2mH,
The capacitance of differential mode capacitor CX1 is 100pF.Described Electro Magnetic Compatibility wave filter (2) can be with in suppression circuit
The electromagnetic interference produced.
As shown in Figure 4, described current rectifying and wave filtering circuit (3) is by transformator T1, bridge rectifier D 1, electrolysis electricity
Holding C1 and inductance L1 composition, utilize resistance R1 to replace load in circuit, its resistance is 500 ohm, transformation
The type of device T1 is Trans CT.In bridge rectifier, add with load between the filter inductance L1 that connects
With the filter capacitor C1, inductance L1 in parallel with between load can filter the alternating component in DC circuit, residue
A small amount of alternating component filters through electric capacity C1.Voltage can be carried out rectification by described current rectifying and wave filtering circuit (3)
Filtering, converts thereof into the unidirectional current of theoretical value 310V.
As it is shown in figure 5, described circuit of power factor correction (4) is by electric capacity C3, C4, diode D3, D4,
D5, resistance R2 form, and the capacitance of electric capacity C3, C4 is 10uF, the model of diode D3, D4, D5
For 1N4007, the resistance of resistance R2 is 10 ohm.One arm of C3 and D5 composition half-bridge, C4 and D3 group
Becoming another arm of half-bridge, D4 and R2 forms charging connection path, and utilization is filled out paddy principle and compensated, filtered electrical
Holding C3 and C4 series connection, the highest half being charged to input voltage of voltage on electric capacity, once line drop is to input
Less than half of voltage, diode D3 and D5 will be forward biased, and makes C3 and C4 start release in parallel
Electric energy, the angle of flow of electric current will raise, and then makes the power factor of power supply be greatly improved, and earth terminal is with described
The GND foot of driving chip PT4107 (7) is connected, and resistance R2 plays current limliting and the effect of suppression surge.
As shown in Figure 6, described decompression voltage regulator (5) by bipolar transistor Q1, electric capacity C5, C6,
Zener diode D6, resistance R3, R4, R5 composition, the type of bipolar transistor Q1 is QNPN, electricity
The capacitance holding C5, C6 is 100pF, and the model of Zener diode D6 is D Schottky, resistance R3,
The resistance of R4, R5 is 1K ohm.The colelctor electrode of transistor connects resistance R5, resistance R3 and R4 two ends are divided
Not connecting outfan and the electric capacity C5 of described current rectifying and wave filtering circuit (3), the positive pole of Zener diode D6 connects
Ground.Being connected to an electric capacity C5 between base stage and the ground of transistor, therefore the emitter terminal at transistor is equivalent to
Add the capacitance bulky capacitor more than C5, utilize a Zener diode D6 in parallel with electric capacity C5 simultaneously,
Can effectively suppress the small ripple of HF switch, one end of electric capacity C6 is connected with the emitter stage of transistor Q1,
Other end ground connection, the emitter stage of transistor Q1 is connected with the VIN foot of described driving chip PT4107 (7).
Described decompression voltage regulator (5) can carry out blood pressure lowering and filtering, for described driving chip to the unidirectional current produced
PT4107 (7) powers.
As it is shown in fig. 7, described positive activation type DC/DC changer (6) is by switch metal-oxide-semiconductor Q2, transformator
T2, diode D7, D8, D9, inductance L4, L5, electric capacity C7, resistance R6, R7, R8, R9, with
And LED LED1, LED2, LED3 composition, the model of switch metal-oxide-semiconductor Q2 is MOSFET-N,
The model of diode D7, D8, D9 is 1N4007, and the type of transformator T2 is Trans Eq, resistance R6,
The resistance of R7, R8, R9 is 3.9 ohm.Circuit have employed a transformator T2, make primary side and secondary
Side the most completely insulated, also makes this loop isolate, it addition, utilize the feature that the high-frequency loss of its iron core is big,
Thus suppressing high frequency spurs incoming control loop, the outfan at transformator T2 is connected to a commutation diode
D8 and a sustained diode 7, sustained diode 7 can with the most sensed voltage breakdown of protection circuit element,
Diode D8 outer end adds an inductance L4, plays the effect of voltage stabilizing, and electric capacity C7 is connected to outfan load
Two ends, be used for filtering the clutter in circuit, switch metal-oxide-semiconductor is connected between transformator T2 input and ground,
The grid of switch metal-oxide-semiconductor is connected with the GATE foot of described driving chip PT4107 (7), metal-oxide-semiconductor source electrode
Ground connection, diode D9 and inductance L5 play the effect of backflow, one end and described positive activation type DC/DC changer (6)
Input be connected, other end ground connection.LED1, LED2, LED3 are connected on the outfan driving power supply,
Resistance R6, R7, R8, R9 are sampling resistor, each sampling resistor one end and the outfan phase driving power supply
Even, other end ground connection, the CS foot of driving chip PT4107 (7) is from described positive activation type DC/DC changer (6)
Sampling end collect voltage signal, when sampled voltage is higher than preset value, and driving chip PT4107 (7) will
By certain logical relation, change the dutycycle of output signal, make output electric current reduce.Drive if it is desired to change
The output size of current in galvanic electricity source, only need to change the resistance of resistance R6, R7, R8, R9.
As shown in Figure 8, described driving chip PT4107 (7) is a step-down LED driving chip.At figure
In 1, it can be seen that the connected mode that driving chip PT4107 (7) each pin is detailed, described driving chip
The GND foot of PT4107 (7) is connected with the outfan of described circuit of power factor correction (4), and ground connection；
The CS foot of described driving chip PT4107 (7) and the sampling end of described positive activation type DC/DC changer (6)
It is connected, for gathering the electric current of LED；The LD foot of described driving chip PT4107 (7) and slip variable resistance
Device R11 is connected, and R11 is connected with the resistance R10 that resistance is 1.5K ohm, resistance R10 ground connection, slides and becomes
Resistance device R11 can finely tune the output electric current of driver；The RI foot of described driving chip PT4107 (7) and resistance
Value is that the resistance R12 of 470 ohm is connected, resistance R12 ground connection, and resistance R12 is used for setting driving chip PT4107
(7) output frequency of GATE foot；The GATE foot of described driving chip PT4107 (7) and described positive activation type
Metal-oxide-semiconductor grid in DC/DC changer (6) is connected, for controlling the electric current of LED；Described driving
The VIN foot of chip PT4107 (7) is connected with the outfan of described decompression voltage regulator (5), and passes through
The electric capacity C8 ground connection of 100pF, VIN foot is the power supply interface of described driving chip PT4107 (7)；Described drive
The overheat protector interface that ROTP foot is external setting-up of dynamic chip PT4107 (7).Described driving chip PT4107
(7) input voltage range that can bear is 18～470V, can be in driving frequency 25KHZ～300KHZ scope
In, provide pwm signal to external power MOS, in the way of constant current, drive LED.Described driving chip
The advantage of PT4107 (7) is that having constant average current controls function；Support that milliampere level exports to ampere level
The function of electric current；The series-parallel connection of up to a hundred LED can be driven；It is capable of PWM count word pulse by input
Dimming function；Support linear dimming function；It is effectively reduced radiation interference；And there is excess temperature detection function mouth,
Can be with external setting-up overheat protector.
Further, in order to verify the correctness that LED drive circuit designs, Proteus software is utilized to imitate
Very, obtain output voltage signal simulation result figure as shown in Figure 9 to imitate with output current signal as shown in Figure 10
True result figure.It can be seen in figure 9 that in initial zero moment, drive circuit output voltage is 0V.Postpone number
Start after Hao Miao to be gradually increased, after about 400ms, enter steady statue, continuity voltage over time
Value no longer increases, stable at 35.5V.As shown in Figure 10, the tendency of current simulations curve is basic and voltage curve
Match, after about 400ms, enter steady statue, enter stable after the most parallel with time shaft, no longer with
The time and change, stable at 380mA.
Find after examining that the magnitude of voltage exported is not a smooth straight line after stable, but doing high frequency
Rate low amplitude vibrations.Time scale according to trunnion axis may determine that, the frequency of vibration of voltage is in thousands of Hz, vibration
Amplitude is about 1V to the maximum.The altofrequency minor fluctuations of driver output voltage and electric current, is sinusoidal voltage
Inductance and the coefficient result of electric capacity in vibration, the high frequency break-make of switching tube and circuit.LED is to bear
The device of high frequency break-make, the high-frequency fluctuation of voltage does not haves harm to LED itself.Luminescence to LED comes
Saying, luminous intensity is current related with by LED.If electric current exists fluctuation, LED's is luminous strong
Also fluctuation can be there is in degree.And if current fluctuation frequency is sufficiently large, more than 100Hz, human eye is that LED be can not be identified
Lamp brightness flop.As long as the meansigma methods of electric current is constant, LED feels to be exactly that luminosity is uniform to people.
Therefore the luminosity of LED is stable, meets lighting requirement.
Claims (5)
1. railway carriage LED illumination drive a power supply, described LED illumination drive power input with
Alternating current is connected, and outfan is connected with LED, it is characterised in that include surge protection circuit (1), electricity
Magnetic compatibility filter (2), current rectifying and wave filtering circuit (3), circuit of power factor correction (4), blood pressure lowering is steady
Volt circuit (5), positive activation type DC/DC changer (6), driving chip PT4107 (7)；Wherein said
The input of surge protection circuit (1) is connected with the alternating current in compartment；Described Electro Magnetic Compatibility wave filter (2)
Input be connected with the outfan of described surge protection circuit (1)；Described current rectifying and wave filtering circuit (3) defeated
Enter end to be connected with the outfan of described Electro Magnetic Compatibility wave filter (2)；Described circuit of power factor correction (4)
Input be connected with the outfan of described current rectifying and wave filtering circuit (3), its outfan and described driving chip
The GND foot of PT4107 (7) is connected；The input of described decompression voltage regulator (5) and described rectifying and wave-filtering
The outfan of circuit (3) is connected, and outfan is connected with the VIN foot of described driving chip PT4107 (7)；
Described positive activation type DC/DC changer (6) has two inputs and an output current sample end, an input
End is connected with the outfan of described current rectifying and wave filtering circuit (3), another input and described driving chip PT4107
(7) GATE foot is connected, and the GATE foot of driving chip drives power supply output for regulating LED illumination
Voltage, the output current sample end of LED is connected with the CS foot of driving chip PT4107 (7).
Railway carriage LED illumination the most according to claim 1 drives power supply, it is characterised in that
Described current rectifying and wave filtering circuit (3) is by transformator T1, bridge rectifier Bridge1, electrochemical capacitor C1 and inductance
L1 forms, in bridge rectifier, add with load between the filter inductance L1 that connect and and between loading also
The filter capacitor C1 of connection.
Railway carriage LED illumination the most according to claim 1 drives power supply, it is characterised in that
Described decompression voltage regulator (5) is by bipolar transistor Q1, electric capacity C5, C6, Zener diode D6, electricity
Resistance R3, R4, R5 composition, is connected electric capacity C5, Zener diode D6 between the base stage of transistor Q1 and ground
In parallel with electric capacity C5, the colelctor electrode of transistor connects resistance R5, resistance R3 and R4 two ends connect institute respectively
State outfan and the electric capacity C5 of current rectifying and wave filtering circuit (3), the plus earth of Zener diode D6, electric capacity
One end of C6 is connected with the emitter stage of transistor Q1, other end ground connection, and the emitter stage of transistor Q1 is with described
The VIN foot of driving chip PT4107 (7) is connected.
Railway carriage LED illumination the most according to claim 1 drives power supply, it is characterised in that
Described positive activation type DC/DC changer (6) by switch metal-oxide-semiconductor Q2, transformator T2, diode D7,
D8, D9, inductance L4, L5, electric capacity C7, resistance R6, R7, R8, R9, and LED LED1,
LED2, LED3 form, and the outfan at transformator T2 connects commutation diode D8 and sustained diode 7,
Diode D8 outer end adds an inductance L4, and electric capacity C7 is connected to the two ends of outfan load, switch
The source electrode of metal-oxide-semiconductor is connected with the positive pole of diode D9, and the negative pole of diode D9 is connected with inductance L5, becomes
Depressor T2 input connects inductance L5 and the drain electrode of switch metal-oxide-semiconductor Q2, the grid of switch metal-oxide-semiconductor respectively
Pole is connected with the GATE foot of described driving chip PT4107 (7), metal-oxide-semiconductor source ground, LED1, LED2,
LED3 is connected on the outfan driving power supply, and resistance R6, R7, R8, R9 are sampling resistor, and each is adopted
Sample resistance one end is connected with the outfan driving power supply, other end ground connection.
Railway carriage LED illumination the most according to claim 1 drives power supply, it is characterised in that
Described driving chip PT4107 (7) is a step-down LED driving chip, described driving chip PT4107
(7) GND foot is connected with the outfan of described circuit of power factor correction (4), and ground connection；Described
The CS foot of driving chip PT4107 (7) is connected with the sampling end of described positive activation type DC/DC changer (6)；
The LD foot of described driving chip PT4107 (7) is connected with slide rheostat R11, and R11 and resistance are 1.5K
The resistance R10 of ohm is connected, resistance R10 ground connection；The RI foot of described driving chip PT4107 (7) and resistance
Value is that the resistance R12 of 470 ohm is connected, resistance R12 ground connection；Described driving chip PT4107 (7)
GATE foot is connected with the metal-oxide-semiconductor grid in described positive activation type DC/DC changer (6)；Described driving core
The VIN foot of sheet PT4107 (7) is connected with the outfan of described decompression voltage regulator (5), and passes through 100pF
Electric capacity C8 ground connection；The overheat protector that ROTP foot is external setting-up of described driving chip PT4107 (7)
Interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620360291.XU CN205596403U (en) | 2016-04-26 | 2016-04-26 | Rail vehicle carriage LED lighting driver power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620360291.XU CN205596403U (en) | 2016-04-26 | 2016-04-26 | Rail vehicle carriage LED lighting driver power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205596403U true CN205596403U (en) | 2016-09-21 |
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ID=56936156
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620360291.XU Expired - Fee Related CN205596403U (en) | 2016-04-26 | 2016-04-26 | Rail vehicle carriage LED lighting driver power |
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| Country | Link |
|---|---|
| CN (1) | CN205596403U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764198A (en) * | 2016-04-26 | 2016-07-13 | 长春工业大学 | Driving power supply for compartment LED illumination of railway vehicle |
-
2016
- 2016-04-26 CN CN201620360291.XU patent/CN205596403U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764198A (en) * | 2016-04-26 | 2016-07-13 | 长春工业大学 | Driving power supply for compartment LED illumination of railway vehicle |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20180426 |