The present invention relates generally to systems and methods for providing emergency lighting in an area. More specifically, the present invention relates to systems and methods for providing reliable power to emergency lighting, monitoring the emergency lighting to insure proper operation and function, and effective, efficient notification of users of status and error conditions of the emergency lighting.
Many buildings and spaces include lighting systems to allow occupants and/or users of the spaces to be able to see items and objects in the spaces. Many of these lighting systems receive power from an electric power grid that provides alternating current (AC) power to users of the power grid. In the United States, this AC power is typically provided at an AC voltage of 110 or 220 VAC. In other countries, the provided voltage may have differing values. Lighting systems are typically hard-wired to receive the AC voltage and provide lighting within the space adjacent to the lighting systems.
In certain circumstances, power from the power grid may be interrupted. This may be a result of a natural disaster, overloading on the power grid, a catastrophic event at the lighting location (such as, for example, a fire), or other emergency situations. In order to avoid injury to those using lighted spaces and/or to allow the users of those spaces to continue to perform their duties effectively during an emergency, those responsible for providing lighting might desire to allow light to be provided during the emergency by means of emergency lighting systems. In certain cases, emergency lighting systems might continue to provide light by switching existing lights to an alternative power supply (such as, for example, a backup AC generator located on the premises), or by switching on alternate “emergency” lights that are powered by a different power source
It would be useful to provide an emergency lighting system and method including an integrated backup power supply that may be readily swapped out by users/monitors of the system even after the emergency lighting system is installed. It would also be useful to provide a monitoring system and method in which a user of the emergency lighting system could easily determine the status of the emergency lighting system to determine if it is functioning properly in both emergency and non-emergency situations.
A more complete understanding of the present invention may be derived by referring to the detailed description when considered in connection with the Figures (not necessarily drawn to scale), wherein like reference numbers refer to similar items throughout the Figures, and:
In the present embodiment, each light of Emergency Lighting System 100 is configured such that it may be moved to direct its light to a specific portion of the area by users of Emergency Lighting System 100 to optimally illuminate a safe path to be traversed by occupants of the space. It should be appreciated that in alternative embodiments, all or some of the lights of Emergency Lighting System 100 may be fixed into position such that they are not movable. In the present embodiment, Emergency Lighting System 100 is shown located on a wall of the space at a height on the wall higher than the typical height of occupants of the space. It should be appreciated that in alternative embodiments, Emergency Lighting System 100 may be located at various heights on a wall of the space, on the ceiling of the space, or on other objects located in or on the space.
Emergency Lighting System 100 is further shown comprising Lights 18. As shown, Lights 18 each include 3 bulbs, and are secured to Housing Cover 15 such that each Light 18 can have the focus of its emitted light redirected both horizontally and vertically. In alternative embodiments, Lights 18 may have more or fewer bulbs. Emergency Lighting System 100 further comprises Auxiliary Power Supply Door 24 protecting an auxiliary power supply of Emergency Lighting System 100, and for providing access to an auxiliary power supply of Emergency Lighting System 100.
Auxiliary Power Supply Door 24 is shown having Lock 25 for securing Auxiliary Power Supply Door 24 in a closed position when Lock 25 is turned clockwise, and for allowing Auxiliary Power Supply Door 24 to be opened to provide access to an auxiliary power supply of Emergency Lighting System 100 when Lock 25 is turned counter-clockwise. It should be appreciated that in alternative embodiments, Auxiliary Power Supply Door 24 may have different shapes other than the shown rectangular shape, and that Lock 25 may take on other forms beyond a rotatable mechanism for securing Auxiliary Power Supply Door 24, including, for example, a latch mechanism, clips, or other means for securing Auxiliary Power Supply Door 24 in a closed position.
Control Board 6 is further shown electrically coupled to Lights 18. Control Board 6 is configured to provide power to Lights 18 and control the charging and discharging of Auxiliary Power Supply 19, and control other aspects of Emergency Lighting System 100 as will be discussed further below.
Emergency Lighting System 100 further comprises Auxiliary Power Supply 19, which is removably secured within Auxiliary Power Supply Compartment 30 by means of Auxiliary Power Supply Retention Device 22. Auxiliary Power Supply 19 is further removably electrically connected to Control Board 6 by means of an electrical cable.
Auxiliary Power Supply 19 and the connecting cable are configured such that when the electrical cable is removed and Auxiliary Power Supply 19 is released by Auxiliary Power Supply Retention Device 22, Auxiliary Power Supply 19 may be removed from Emergency Lighting System 100 and replaced by another Auxiliary Power Supply 19 by connecting the electrical cable and securing the new Auxiliary Power Supply 19 with Auxiliary Power Supply Retention Device 22. Emergency Lighting System 100 further comprises Lights 18 electrically coupled to Control Board 6. In the present embodiment, each Light 18 includes three bulbs, and is configured to be movable such that the focus of each Light 18 can be directed to provide light in the desired area. Control Board 6 is configured to control the power provided to the Lights 18 to determine when they are illuminated and the intensity of illumination.
Emergency Lighting System 100 further comprises Display 9 electrically coupled to Control Board 6. In the present embodiment, Display 9 is an alphanumeric display configured to display letters and/or numbers based on output signals provided by Control Board 6. Emergency Lighting System 100 further comprises Auxiliary Power Supply Door 24 secured to Housing Cover 15 such that Auxiliary Power Supply Door 24 may be opened and closed by a user to provide easy access to Auxiliary Power Supply 19.
In the present embodiment, Auxiliary Power Supply Door 24 is secured to Housing Cover 15 by hinges that allow Auxiliary Power Supply Door 24 to rotate along an edge of Auxiliary Power Supply Door 24 to provide access to Auxiliary Power Supply 19. In an alternative embodiment, Auxiliary Power Supply Door 24 may be configured so that it may be completely removed to provide access to Auxiliary Power Supply 19. In the closed position, Auxiliary Power Supply Door 24 prevents access to Auxiliary Power Supply 19 and protects it from external debris. Auxiliary Power Supply Door 24 includes Lock 25 for securing Auxiliary Power Supply Door 24 in a closed position. In the present embodiment, Lock 25 is a screw latch that allows Auxiliary Power Supply Door 24 to open when it is rotated counterclockwise, and secures Auxiliary Power Supply Door 24 in a closed position when rotated clockwise.
The supplied lower AC voltage provided at the secondary winding of Transformer 11 is sensed using the voltage divider network (R30 and R31) by providing the output of the voltage divider network via R13 (referred to hereinafter as AC_V) to pin 15 of Integrated Circuit 1. In the present embodiment, Integrated Circuit 1 is a Holtek HT66F20-1 microcontroller including processing circuitry, memory, and I/O functionality. A full wave diode rectifier D10 and D11 converts the lower AC voltage provided at the secondary winding of Transformer 11 to a DC voltage (referred to as VDC). Capacitors C8 and C9 are used to smooth the DC voltage (referred to as SVDC) obtained from the diode rectifier D10 and D11. SVDC is then available to charge Auxiliary Power Supply 19 as discussed below.
Control Board 6 further includes a battery charging circuit configured to charge Auxiliary Power Supply 19 under the control of Integrated Circuit 1. The battery charging circuit comprises a voltage regulator, transistor Q5, and transistors Q8 and Q6. The battery charging circuit receives SVDC from the smoothing and rectifier section of Control Board 6 (discussed above), and processes the SVDC signal to provide a constant current charging voltage to Auxiliary Power Supply 19 at BAT_V when the battery charging circuit is enabled by Integrated Circuit 1. The battery charging circuit is enabled when Integrated Circuit 1 provides an output signal (referred to as AC_CTRL) at pin 16. This AC_CTRL signal, which is electrically coupled to the transistor Q6, serves to turn transistor Q6 (and the battery charging circuit) on, providing the constant charging current to Auxiliary Power Supply 19.
Control Board 6 further includes monitoring circuitry to monitor the charge level of Auxiliary Power Supply 19 to determine if Auxiliary Power Supply 19 is fully charged or partially discharged. As noted previously, Auxiliary Power Supply 19 is electrically coupled to Control Board 6 at BAT_V. The voltage level of BAT_V is provided to pin 13 of Integrated Circuit 1 as signal BATTER_V, which is the output of the voltage divider network R19 and R18 as provided via R11. When Integrated Circuit 1, monitoring the signal BATTER_V, determines that Auxiliary Power Supply 19 is fully charged (a voltage of approximately 6.8V), the battery charge is disabled by the AC_CTRL signal provided from Integrated Circuit 1 to the battery charging circuit. When Integrated Circuit 1, monitoring BATTER_V, determines that the battery voltage has fallen below 6.8V, the battery charging circuit is turned on again via the AC_CTRL signal from Integrated Circuit 1.
Control Board 6 further includes circuitry to monitor the AC voltage provided to Control Board 6, determine when it is too low, and enable Lights 18 to turn on when the AC voltage is not present, or is too low. More specifically, as noted above, AC_V is provided to Integrated Circuit 1 via pin 15. When AC_V falls below a specified value, Integrated Circuit 1 causes pin 14 (BATTER_CTRL) to change to a state that causes transistor Q3 to turn on. This results in transistor Q4 providing voltage and current from Auxiliary Power Supply 19 to provide power to Lights 18, turning them on and providing illumination.
Control Board 6 further includes lamp driver circuity for each of Lights 18, electrically coupled to transistor Q4 and generally illustrated in the lower left-hand portion of
Control Board 6 further includes Display 9. Display 9 is electrically coupled to Integrated Circuit 1, and configured to receive signals from Integrated Circuit 1 to drive the Display 9 to display alpha-numeric characters. In the present embodiment, Display 9 is electrically coupled to Integrated Circuit 1 through resistors via a jumper J1. In the present embodiment, Integrated Circuit 1 provides output signals at various of pins 9, 1, 3-6 and 8 to drive individual segments of Display 9, causing Display 9 (depending on the values of those pins) to display various characters and/or numbers. Integrated Circuit 1 is configured to monitor various signals and states of Emergency Lighting System 100, and to display various alpha-numeric characters via Display 9 based on that information and various determinations made by Integrated Circuit 1. In the present embodiment, each alpha-numeric code is configured to communicate to a user/viewer of Emergency Lighting System 100 information about the Emergency Lighting System 100.
Referring collectively to
If Integrated Circuit 1 determines that BATTER_V has a value between 0.877 Volts and 1.19 Volts (indicative, in the present embodiment, of a BAT_V voltage of Auxiliary Power Supply 19 of between approximately 5 Volts and 6.8 Volts), Integrated Circuit 1 determines that Auxiliary Power Supply 19 is not fully charged, and that Emergency Lighting System 100 is in a “battery charging” state. In this case, Integrated Circuit 1 also turns on the charging circuit (if it is not already on) or leaves it on (if it is already on) by means of the AC_CTRL signal. In addition, in order to effectively communicate to users of Emergency Lighting System 100 that Auxiliary Power Supply 19 is not fully charged, and that Emergency Lighting System 100 is in a “battery charging” state, Integrated Circuit 1 drives the outputs of Integrated Circuit 1 pins 9, 1, 3-6 and 8 to display, on Display 9, the code 1, indicative to users of a “battery charging” state.
If Integrated Circuit 1 determines that AC_V (pin 15 of Integrated Circuit 1) has a value of less than approximately 0.351 Volts (which corresponds, in the present embodiment, of voltage of less than approximately 30V at the secondary winding of Transformer 11), Integrated Circuit 1 determines that Emergency Lighting System 100 is in “Emergency/Battery” mode. When in Emergency/Battery mode, Integrated Circuit 1 causes pin 14 (BATTER_CTRL) to switch to a level to cause Lights 18 to turn on, the Lights 18 being powered by Auxiliary Power Supply 19. In addition, Integrated Circuit 1 causes Integrated Circuit 1 pins 9, 1, 3-6 and 8 to display, on Display 9, the code 2, indicative to users that Emergency Lighting System 100 is in Emergency/Battery mode. Once Integrated Circuit 1 determines that AC_V no longer has a value of less than approximately 0.351 Volts, Integrated Circuit 1 causes Emergency Lighting System 100 to enter one of the other modes and display the appropriate mode code on Display 9.
If Integrated Circuit 1 determines that Auxiliary Power Supply 19 has been disconnected or shorted, or the charging circuitry has failed, Integrated Circuit 1 causes Integrated Circuit 1 pins 9, 1, 3-6 and 8 to display, on Display 9, the code 3. In an embodiment, Integrated Circuit 1 determines that Auxiliary Power Supply 19 has been disconnected or shorted, or that the charging circuitry has failed, by monitoring pin 11 (LED A) of Integrated Circuit 1 and determining that the voltage at pin 11 (LED A) is between approximately 0 and 1.25V. In an alternative embodiment, Integrated Circuit 1 determines that Auxiliary Power supply 19 has been disconnected or shorted, or that the charging circuitry has failed, by monitoring pin 10 (LED B) of Integrated Circuit 1 in a manner similar to the monitoring of pin 11.
If Integrated Circuit 1 determines that BATTER_V voltage is between approximately 0 and 0.526V (corresponding to a BAT_V voltage of between approximately 0 and 3 volts), Integrated Circuit 1 determines that Auxiliary Power Supply 19 is connected, but is bad, and causes Integrated Circuit 1 pins 9, 1, 3-6 and 8 to display, on Display 9, the code 4. If the user sees a code 4 displayed, the Auxiliary Power Supply 19 should be replaced.
Integrated Circuit 1 is further configured to monitor the signals LED A and LED B (via pins 11 and 10, respectively, of Integrated Circuit 1), indicative of voltages of Lights 18. If the voltage of LED A or LED B is greater than approximately 3.6V, Integrated Circuit 1 determines that at least one of the Lights 18s has failed, and causes Integrated Circuit 1 pins 9, 1, 3-6 and 8 to display, on Display 9, the code 5, indicative to a user of Emergency Lighting System 100 of a lamp failure.
If Integrated Circuit 1 determines that BATTER_V is between approximately 0.526 volts and 0.877 volts, indicative of a BAT_V (Auxiliary Power Supply 19) voltage of approximately 3-5 volts, Integrated Circuit 1 determines that the voltage of Auxiliary Power Supply 19 is low, and causes Integrated Circuit 1 pins 9, 1, 3-6 and 8 to display, on Display 9, the code 6 indicative of low Auxiliary Power Supply 19 voltage. Integrated Circuit 1 further causes Emergency Lighting System 100 to remain in, or enter, a charging mode to charge Auxiliary Power Supply 19.
It should be appreciated that in alternative embodiments, Integrated Circuit 1 may be configured to cause the alpha-numeric characters displayed on Display 9 to flash on and off. In addition, although the current embodiment provides approximate voltage ranges required for Emergency Lighting System 100 to enter various states and display various codes, it should be appreciated that in alternative embodiments, Emergency Lighting System 100 could be configured to enter various states (and display various codes) based on voltage and/or current threshold values other than those of the present embodiment.
Although the preferred embodiments of the invention have been illustrated and described, it will be readily apparent to those skilled in the art that various modifications may be made therein without departing from the spirit of the invention or from the scope of the appended claims.
This application claims priority to U.S. Provisional Patent Application entitled “EMERGENCY LIGHTING SYSTEM,” Ser. No. 62/440,218, filed Dec. 29, 2016, the disclosure of which is hereby incorporated entirely herein by reference.
Number | Date | Country | |
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62440218 | Dec 2016 | US |