DESC:A SWITCHING TOPOLOGY FOR OPERATING LUMINARIES OF A STREET LIGHTING SYSTEM
TECHNICAL FIELD
[001] The subject matter in general relates to a street lighting system. More particularly, but not exclusively, the subject matter relates to an introduction of an efficient switching topology in the street lighting system that helps in effective power management control with lower BOM (Bill of Materials) cost and higher reliability with respect to the other available solutions.
BACKGROUND
[002] Background description includes information that may be useful in understanding the present subject matter.
[003] In current scenario, street light plays a major role in safe commutation of pedestrian from one place to another. In addition, street light provides sufficient light for people to see important objects required for traversing the road. Moreover, street lighting plays an important role in reducing the risk of night-time accident, assisting in the protection of buildings/property (discouraging vandalism), discouraging crime and creating a secure environment for habitation.
[004] Therefore, there is need that all the lights of the street lights remain operational during the whole night, also in current scenario sometimes streetlights are continuously on during day as well and thus consumes continuous energy which generates financial loss to the utility supply company and create extra burden to the generating power station.
[005] Different types of technologies are available to turn the streetlight on/off which are as follows:
• The simplest is the manual operation which is cost effective but running cost is higher.
• Central Control & Monitoring System (CCMS) based streetlight are available where a complete string of streetlights will get turned on/off as per the schedule and the cost of the products is quite high.
• Global Positioning System (GPS) based streetlight technology is also present where the individual unit need to be controlled, but this system/model is very complex as a result, the product cost is very high and requires the high running cost.
[006] After taking all the above-mentioned issues into consideration, the existing state of art related to this field of technology has proposed Astro-timer based streetlights as shown in FIG.1 that are cost effective, easy to implement and gives individual light control. However, existing streetlights 100 use astronomical-timer or schedule-timer 104 that operates the electro-mechanical devices such as relay 108 to make or break the power supplied to LED lighting system 106 comprising LED driver 106A and LED load 106B. These electro-mechanical devices 108 switched their position from ON/OFF or vice versa as per the astronomical-timer or schedule-timer or other sensors feedback that in turn interrupts the utility power supplied from an input source 102 to the LED lighting system 106.
[007] However, the electrical and mechanical life of the electro-mechanical part is limited. As, due to fluctuation of the utility power supply the electro-mechanical device chatters and get damage. Due to this, luminaries got failed and need repair and requires replacement.
[008] Thus, there is need in the art to provide a switching topology in the street lighting system where the LED luminaire are electronically switched ON/OFF without using the electromechanical relay & also eliminate the above mentioned technical problems with lesser BOM cost.
OBJECTS OF THE DISCLOSURE
[009] In view of the foregoing limitations inherent in the state of the art, some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed herein below.
[0010] It is a general or primary object of the present disclosure to propose a switching topology in the street lighting system through which the LED luminaire are electronically switched ON/OFF without using the electromechanical relay.
[0011] It is another object of the present disclosure is to propose the switching topology in the street lighting system that reduces the amount of power consumed by the street lighting system (if kept ON during the day).
[0012] It is yet another object of the present disclosure is to propose the switching topology in the street lighting system that in turn reduces the BOM cost compared to a system involving electro-mechanical relay.
[0013] It is yet another object of the present disclosure is to propose the switching topology in the street lighting system that helps in automatically turn on/off the power supply to the LED driver as per the geographical location.
[0014] It is yet another object of the present disclosure to provide the switching topology in the street lighting system that results in less power consumption with respect to system involving electromechanical relay.
[0015] It is still yet another object of the present disclosure to provide the switching topology in the street lighting system that enhances the performance and reliability of the street lighting system.
[0016] It is further object of the present disclosure to provide the switching topology that enhanced the life of the luminaries of the street lighting system.
[0017] It is yet further object of the present disclosure to provide the switching topology that reduces the chances of the failure of the luminaries of the street lighting system.
[0018] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.
SUMMARY
[0019] This summary is provided to introduce concepts relates to an introduction of an efficient switching topology in the street lighting system that helps in effective power management without increasing the BOM cost. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0020] In accordance with an embodiment, the present disclosure proposes a switching topology for operating luminaries of a street lighting system, the switching topology comprises an input source, an AC-DC rectifier including AC surge protection and filter connected with the input source, a first DC-DC converter connected with the AC-DC rectifier, wherein said first DC-DC converter operates the power supply from the input source in the constant voltage (CV) mode, an Astro timer unit connected with the first DC-DC converter, wherein the Astro timer unit receives power from the first DC-DC converter; and a second DC-DC converter connected with the astro timer unit , wherein said second DC-DC converter operates the power supply from the input source in the constant current (CC) mode and supplied to an LED module .
[0021] In accordance with an aspect, the said switching topology further comprises multiple transistors (Q), multiple resistors (R) and at least one opto coupler (U) coupled with the astro timer unit and the LED Lighting system.
[0022] In accordance with an aspect, the LED module is selected from a group of solid state light source or semiconductor light-emitting diodes (LEDs).
[0023] In accordance with an aspect, the LED lighting system comprises an LED driver and a LED load.
[0024] In accordance with an aspect, the astro-timer unit comprises a microcontroller (MCU), real time clock (RTC) and an inbuilt battery.
[0025] In accordance with an aspect, the astro-timer unit further comprises a storage device and a processing device which refers to the MCU.
[0026] Other objects, features and advantages of the present disclosure will become apparent from the following detailed description. It should be understood, however, that the detailed description and the specific examples, while indicating specific embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF DRAWINGS
[0027] While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter that is regarded as forming the present subject matter, it is believed that the present disclosure will be better understood from the following description taken in conjunction with the accompanying drawings, where like reference numerals designate like structural and other elements, in which:
[0028] FIG.1 illustrates a block diagram of a switching topology for operating luminaries of a street lighting system, in accordance with a prior art;
[0029] FIG.2 illustrates a block diagram of a switching topology for operating luminaries of a street lighting system, in accordance with a present disclosure;
[0030] FIG.3 illustrates a block diagram showing the interconnection between the Input Source, LED Lighting System and the Astro timer, in accordance with the present disclosure;
[0031] FIG.4 illustrates a line diagram of a switching topology for operating luminaries of a street lighting system, in accordance with the present disclosure;
DETAILED DESCRIPTION
[0032] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0033] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0034] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an”, and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes”, “consisting” and/or “including” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0035] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0036] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0037] The present disclosure defines an efficient switching topology for a street lighting system that overcomes all the problems associated with the prior arts related to this filed of technology. FIG.2 illustrates a block diagram of a proposed switching topology, in accordance with a present disclosure.
[0038] The proposed switching topology 200 comprises an AC-DC rectifier 202 including AC surge protection and filter connected with the input source 102, a first DC-DC converter 204 connected with the AC-DC rectifier 202, wherein said first DC-DC converter 204 operates the power supply from the input source 102 in the constant voltage (CV) mode, an Astro timer unit 104 connected with the first DC-DC converter 204, wherein the Astro timer unit receives power from the first DC-DC converter, and a second DC-DC converter 106A connected with the astro timer unit 104, wherein said second DC-DC converter 106A operates the power supply from the input source 102 in the constant current (CC) mode and supplied to LED MODULE 106B .
[0039] The switching topology 200 further comprises multiple transistors (Q), multiple resistors (R) and at least one opto coupler (U) coupled with the astro timer unit 104 and the LED Lighting system 106.
WORKING OF THE INVENTION
[0040] The AC- DC rectifier converts the AC power supply received from the input power source 102 in to direct power supply. This direct power supply is then transferred through first DC-DC converter 204 that operates the power supply from the input source 102 in the constant voltage (CV) mode and then the resultant constant voltage direct power is supplied to an astro timer unit 104 comprising a microcontroller connected with a Real Time clock (RTC) and a battery.
[0041] The unit comprises of a microcontroller which helps to calculate the precise sun rise and sun set time depending on a particular latitude and longitude of a particular geographical location.
[0042] After that, based on the RTC reference time and the calculated sun rise and sun set timings, switching is activated and the LED street light is switched off and on. In addition, the battery is provided here that is used to provide constant supply to the Real time clock (RTC) when utility supply gets failed. Hence, there is no interruption in the power supply to the Real time clock (RTC).
[0043] In addition, after getting information from the Astro- timer unit 104, the second DC-DC converter 106A operates the power supply from the input source 102 in the constant current (CC) mode and then supplied to the LED MODULE/LED LOAD 106B.
[0044] The Astro- timer unit 104 further comprises a processing device and a storage device. In some instances, the astro timer unit 104 may employ a processing device that analyses a lookup table or other data structure containing data indicative of the scheduled, predicted or expected times of occurrence of one or more solar events from a storage device. In other instances, the processing device may calculate the scheduled, predicted or expected times of occurrence of one or more solar events using one or more equations, relationships or correlations based on the date, the day in the solar cycle (e.g., day 106 of a 365¼ day cycle), or the Julian date.
[0045] FIG.3 illustrates a block diagram showing the interconnection between the Input Source, LED lighting system and the Astro timer, in accordance with the present disclosure. Through this diagram, the present disclosure illustrates the astro timer unit 104 of the proposed switching topology 200 is directly connected with the LED lighting system 106 that further includes a LED Driver 106A connected with a LED load/LED Module 106B, which automatically turns ON/OFF the LED driver of the light source according to schedule or sensor feedback, throughout the year without human interference or electro-mechanical relay.
[0046] FIG.4 illustrates a line diagram of a switching topology 200 for operating luminaries of a street lighting system, in accordance with the present disclosure.
[0047] During dusk condition, the U1 controller of the proposed switching topology 200 gives Low signal at pin No 3, as per the instruction received from the Astro timer 102, as a result the base current supplied to the transistor Q1 will be zero and it remains in the OFF state, thus no current flows through resistance R3 and opto coupler output will remain high and Vcc will be in high state which in turn switch ON the driver and hence the LED street light will glow. The streetlight will remain in the ON state till dawn.
[0048] During dawn condition, the control signal from U1 at pin No 3 becomes high which gives driving signal to the transistor Q1, as a result current start flowing through the resistance R3 and thus opto coupler U2 output at pin 3&4 will pull down and which in turn switches OFF Vcc of the IC and which results in switching off the driver and thereby the street light.
[0049] Due to the proposed switching topology for operating luminaries of a street lighting system, all the problems related to the state of art are solved.
TECHNICAL ADVANTAGES
[0050] The proposed switching topology in the street lighting system electronically switched ON/OFF the LED luminaire without using the electromechanical relay.
[0051] The proposed switching topology in the street lighting system reduces the amount of power consumed by the street lighting system.
[0052] The proposed switching topology in the street lighting system that reduces the BOM cost compared to the electro-mechanical relay system.
[0053] The proposed switching topology in the street lighting system that helps in automatically turns on/off the power supply to the LED driver as per the geographical location ensuring dusk to dawn operation and thus increases the life of the luminaries.
[0054] The proposed switching topology in the street lighting system results in lesser power consumption compared to the system involving electro-mechanical relay.
[0055] The proposed switching topology in the street lighting system enhances the performance and reliability of the street lighting system.
[0056] The proposed switching topology in the street lighting system enhances the life of the luminaries of the street lighting system.
[0057] The proposed switching topology in the street lighting system reduces the chances of the failure of the luminaries of the street lighting system.
[0058] Furthermore, each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the “invention” may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the “invention” will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[0059] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0060] Furthermore, those skilled in the art can appreciate that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0061] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0062] While the foregoing describes various embodiments of the present disclosure, other and further embodiments of the present disclosure may be devised without departing from the basic scope thereof. The scope of the present disclosure is determined by the claims that follow. The present disclosure is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
,CLAIMS:We claim:
1. A switching topology (200) for operating luminaries of a street lighting system, which automatically turns on /off based on the sun-set and sun-rise timings of a particular geographical location without using electro-mechanical switch/relay,
the switching topology (200) comprises:
an AC-DC rectifier (202) including AC surge protection and filter connected with an input source;
a first DC-DC converter (204) connected with the AC-DC rectifier (202), wherein said first DC-DC converter (204) operates the power supply from the input source (102) in the constant voltage (CV) mode;
an Astro timer unit (104) connected with the first DC-DC converter (204), wherein the Astro timer unit receives power from the first DC-DC converter; and
a second DC-DC converter (106A) connected with the astro timer unit (104), wherein said second DC-DC converter (106A) operates the power supply from the input source (102) in the constant current (CC) mode and supplied to the LED Module/LED Load (106B).

2. The switching topology (200) as claimed in claim 1, wherein said switching topology (200) further comprises multiple transistors (Q), multiple resistors (R) and at least one opto coupler (U) coupled with the astro timer unit (104) and the LED lighting system (106).

3. The switching topology (200) as claimed in claim 1, wherein the LED Module/LED Load (106B) is solid state light source or semiconductor light-emitting diodes (LEDs).

4. The switching topology (200) as claimed in claim 1, wherein the LED lighting system (106) comprises an LED driver (106A) and a LED Module/LED load (106B).

5. The switching topology (200) as claimed in claim 1, wherein the astro timer unit (104) comprises a microcontroller (MCU), a real time clock (RTC) and an inbuilt battery.

6. The switching topology (200) as claimed in claim 5, wherein the astro timer unit (104) further comprises a storage device and a processing device i.e. MCU.