Micro-power generator for valve control applications
A micro-power generator is integrated in a pneumatic valve controller, such that the micro-power generator is powered by the same compressed air supply used to operate the valve. The micro-power generator includes a micro-turbine connected to a DC power generator, and a source of compressed air is used to drive the micro-turbine to generate power via the generator. The system may include a valve controller pneumatically connected to the compressed air supply. The valve controller may include electronics for displaying a condition of the controller. The system can include an electronic field device in communication with the valve controller for displaying a condition of the valve controller. The micro-turbine generator can be electrically connected to the field device to provide power to the electronic field device. Other embodiments are disclosed and claimed.
1. A system for supplying power to a pneumatically operated valve, the system connected to a compressed air supply and connected to a main power supply that is separate from the compressed air supply, the compressed air supply operating the pneumatically operated valve, the system comprising:
a valve controller coupled to the pneumatically operated valve and pneumatically connected to the compressed air supply, the valve controller having electronics for displaying a condition of the valve controller, the electronics receiving electric power from the main power supply;
an electronic field device separate from the valve controller and including a backlit display, the electronic field device in communication with the valve controller for displaying the condition of the valve controller;
a micro-turbine generator integrated into the valve controller and pneumatically connected to the compressed air supply, the micro-turbine generator configured to convert power from the compressed air supply to electric power and deliver electric power to at least one of the valve controller and the electronic field device in parallel to the main power supply;
a communications link connecting the electronic field device and the valve controller and providing galvanic isolation therebetween,
wherein the main power supply is capable of operating the system in the event of compressed air supply interruption.
2. The system of claim 1 , the micro-turbine generator including a set of stationary nozzles, a turbine rotor, an outlet disc, and a shaft for transmitting rotational motion of the turbine rotor to a DC generator.
3. The system of claim 2 , wherein power from the DC generator is coupled to the electronic field device.
4. The system of claim 1 , the micro-turbine generator contained in a housing having a diameter of about 15 millimeters (mm) and a length of about 25 mm.
5. The system of claim 1 , wherein the micro-turbine generator is coupled to a battery to store power.
6. The system of claim 1 , wherein the micro-turbine generator is coupled to a super-capacitor to store power.
7. The system of claim 1 , further comprising an intrinsic safety barrier arranged between the main power supply and the valve controller.
8. The system of claim 1 , wherein the electronics include a controller backlit display.
9. The system of claim 1 , wherein the communications link is hardwired.
10. The system of claim 1 , wherein the communications link is wireless.