US 9,812,898 B2
Backup power source for providing a fail-safe actuation of an electric actuator
Christopher W. Spivey, Tucker, GA (US); and Kirk S. Hegwood, Chamblee, GA (US)
Filed by Christopher W. Spivey, Tucker, GA (US); and Kirk S. Hegwood, Chamblee, GA (US)
Filed on Nov. 18, 2013, as Appl. No. 14/82,417.
Prior Publication US 2015/0137605 A1, May 21, 2015
Int. Cl. H02J 9/06 (2006.01)
CPC H02J 9/061 (2013.01) [Y10T 307/625 (2015.04)] 31 Claims
OG exemplary drawing
 
1. A capacitive-based system for providing an electrical backup power source for an electric actuator for fail-safe actuation, wherein the electric actuator has an input supply, said capacitive-based system comprising:
a) a plurality of electromechanical relays
b) a primary DC or AC power source connected to an input of said electromechanical relays
c) an input power supply and an output power supply; and
b) a plurality of supercapacitors; and
d) wherein said input power supply is converting an AC or DC power from the primary power source to a Regulated DC output;
wherein said plurality of supercapacitors are connected in series to form a bank of supercapacitors;
wherein said bank of supercapacitors are operatively connected to an output of said input power supply;
wherein said bank of supercapacitors are charged to a bank voltage set by said regulated DC output of said input power supply;
wherein said bank of supercapacitors are used to store said electrical backup power source;
wherein said output power supply is operatively connected to said bank of supercapacitors;
wherein said output power supply boosts said bank voltage of said bank of supercapacitors to a higher DC output voltage; and
wherein said higher DC output voltage is connected to a second input of said electromechanical relays;
wherein said plurality of electromechanical relays are used to switch an input power to the electric actuator between the primary power and the electrical backup power;
wherein said plurality of electromechanical relays comprise two four pole relays;
wherein the first four pole relay selects which power source is applied to the electric actuator, and the second four pole relay selects which positioning signals are applied to the electric actuator;
When the first four pole relay is energized by the application of a positive primary power and a negative primary power a set of normally-open contacts are connected and conduct the positive and negative primary power to a positive and a negative input power of the electric actuator respectively;
When the second four pole relay is energized by the application of the positive and the negative primary power a different set of normally-open contacts are connected and conduct a remote open position signal, a remote close position signal, as well as a signal reference, to a position open signal, a position close signal and a position reference signal of the electric actuator, respectively;
When the first four pole relay is not energized, a set of normally-closed contacts are connected and conduct a positive backup power and a negative backup power to the positive and the negative input power of the electric actuator, respectively;
When the second four pole relay is not energized, a different set of normally-closed contacts are connected and conduct a fail-safe open signal and a fail-safe close signal, as well as the signal reference to the position open signal, the position close signal, and the position reference signal of the electric actuator, respectively;
The fail-safe signal is determined by a single pole double throw fail-safe position switch that selectively applies the positive backup power to either the fail-safe open signal or the fail-safe close signal.