System and method for thermal protection for a universal load control cabinet

• US 9,601,907 B2
• Filed: 04/18/2014
• Issued: 03/21/2017
• Est. Priority Date: 04/18/2013
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Inventors: Zulim, Dalibor, Westrick, Richard L. Jr., King, Rick, Mullins, Leslie
• Primary Examiner(s): Taningco, Alexander H
• Assistant Examiner(s): Garcia, Christian L
• Application Number:
  US14/256,221
• Publication Number:
  US 20140312773A1
• Time in Patent Office: 1,068 Days
• Field of Search: 315/113, 315/294, 315/291, 315/312, 315/309, 362/294, 362/362, 362/547
• US Class Current: 1/1
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: H02B 1/32 Mounting of devices therein
• CPC Class Codes: H02H 3/00 Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems H02H7/00; systems for change-over to standby supply H02J9/00 ; integrated protection for motors H02H7/0822
• CPC Class Codes: H02M 1/327 against abnormal temperatures
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 5/293 using semiconductor devices only
• CPC Class Codes: H02M 5/2935 using reverse phase control, i.e. turn-on of switches in series with load at zero crossing of input voltage, turn-off before next zero crossing
• CPC Class Codes: H05B 41/2828 using control circuits for the switching elements H05B41/2827 takes precedence
• CPC Class Codes: Y10S 315/07 Starting and control circuits for gas discharge lamp using transistors

Abstract

A universal load control module may include a power supply that operates over a wide voltage range, a microcontroller, and one or more functional control blocks. A functional control block may include a dimmer circuit for controlling a lighting load that provides reverse phase cut mode dimming, forward phase cut mode dimming, and hybrid phase cut mode dimming, as well as thermal protection. One or more universal control modules may be housed in a cabinet that include a cabinet control module. The cabinet may include additional thermal protection measures.

Claims

1. A lighting control system, comprising:

a plurality of load control modules, wherein each load control module controls a load and includes a power supply that operates over a wide voltage range, and at least one load control module includes a dimmer circuit that includes a microcontroller and circuitry to control a phase control signal;

a thermal shelf mounted between two vertically adjacent load control modules, the thermal shelf having one or more inclined surfaces to disrupt heat flow from a lower vertically adjacent load control module to a higher vertically adjacent load control module; and

a plurality of vents located in a panel of a cabinet, wherein the vents are located proximate to the load control modules.

2. The system of claim 1, further comprising:

a plurality of branch circuit breakers, wherein at least one branch circuit breaker is associated with each of the load control modules, wherein the branch circuit breakers are mounted so that the branch circuit breakers are adjacent to one another with a space between adjacent branch circuit breakers and the branch circuit breakers are mounted below the load control modules, and wherein the branch circuit breakers are capable of operating over the wide voltage range.

3. The system of claim 1, further comprising a cabinet control module, wherein the cabinet control module monitors temperature and is capable of instructing the at least one load control module to adjust a phase angle or slew rate of the phase control signal based on temperature.

4. The system of claim 1, wherein the dimmer circuit monitors temperature and adjusts the phase control signal based on temperature.

5. The system of claim 1, further comprising a cabinet control module, wherein the cabinet control module instructs the dimmer circuit to select one of a plurality of transition circuits based on temperature monitoring by the cabinet control module.

6. The system of claim 1, wherein the dimmer circuit includes a plurality of transition circuits and the dimmer circuit controls a transition time of the phase control signal by selecting one of the transition circuits based on temperature monitoring by the dimmer circuit.

7. A control system, comprising:

a plurality of load control modules, wherein each load control module controls a load and at least one of the load control modules includes a dimmer circuit with a thermistor and is configured to control a corresponding load based on temperature; and

a cabinet control module, wherein the cabinet control module receives temperature information from the at least one of the load control modules and, based on the received temperature information, controls the load control modules to maintain operation of the load control modules below a predetermined thermal limit,

wherein the load control modules and the cabinet control module are capable of operating over a wide voltage range.

8. The control system of claim 7, further comprising:

a thermal shelf mounted between a first load control module and a second load control module that is located above the first load control module.

9. The system of claim 7, further comprising a cooling device located above the load control modules.

10. The system of claim 7, wherein the dimmer circuit controls a phase control signal based on temperature monitoring by the thermistor of the dimmer circuit.

11. The system of claim 7, wherein the dimmer circuit controls a phase control signal based on the temperature information received by the cabinet control module.

12. The system of claim 7, further comprising a plurality of branch circuit breakers, wherein at least one branch circuit breaker is associated with each of the load control modules, wherein the branch circuit breakers are mounted so that the branch circuit breakers are adjacent to one another with a space between adjacent branch circuit breakers and the branch circuit breakers are mounted below the load control modules.

13. The system of claim 7, wherein the dimmer circuit includes a plurality of transition circuits and the dimmer circuit controls a transition time of a phase control signal by selecting one of the transition circuits based on temperature monitoring by the thermistor of the dimmer circuit.

14. The system of claim 7, wherein the dimmer circuit includes a plurality of transition circuits, and wherein the cabinet control module is capable of instructing the load control module to select one of the transition circuits based on the temperature information received by the cabinet control module.

15. A lighting control system, comprising:

a plurality of load control modules, wherein each load control module controls a load and at least one load control module is configured to control a corresponding load;

a plurality of branch circuit breakers, wherein at least one branch circuit breaker is associated with each of the load control modules, wherein the branch circuit breakers are mounted so that the branch circuit breakers are adjacent to one another with a space between adjacent branch circuit breakers and the branch circuit breakers are mounted below the load control modules; and

a cabinet control module, wherein the cabinet control module receives temperature information from the at least one of the load control modules and, based on the received temperature information, controls the load control modules to maintain operation of the load control modules below a predetermined thermal limit,

wherein the load control modules and the cabinet control module each include a power supply that operates over a wide voltage range by detecting an input voltage and adjusting its operation based on the input voltage to provide at least one output voltage for components of the module, wherein the output voltage is independent of the input voltage, and

wherein the branch circuit breakers are capable of operating over the wide voltage range.

16. The system of claim 15, wherein two of the load control modules are vertically adjacent to one another, further comprising:

a thermal shelf mounted between the two load control modules.

17. The system of claim 15, further comprising a cooling device located above the load control modules.

18. The system of claim 15, wherein the at least one load control module includes a dimmer circuit that controls a phase control signal based on temperature monitoring by a thermistor included in the dimmer circuit.

19. The system of claim 15, wherein the cabinet control module is capable of instructing the at least one control module to adjust a phase control signal based on the temperature information received by the cabinet control module.

20. The system of claim 15, wherein the dimmer circuit includes a plurality of transition circuits that provide different transition times.