Energy harvesting damper control and method of operation

• US 9,680,324 B2
• Filed: 03/06/2015
• Issued: 06/13/2017
• Est. Priority Date: 03/06/2015
• Status: Active Grant

• Current Assignee: Air Distribution Technologies IP, LLC
• Original Assignee: Ruskin Company (Johnson Controls International plc)
• Inventors: Wiley, Josiah, Koop, Edward Neal
• Primary Examiner(s): Ip, Paul
• Application Number:
  US14/641,157
• Publication Number:
  US 20160258639A1
• Time in Patent Office: 830 Days
• Field of Search: 318 3, 318 16, 318446, 236 493
• CPC Class Codes: F24F 11/74 for controlling air flow rate or air velocity
• CPC Class Codes: F24F 2140/40 Damper positions, e.g. open or closed
• CPC Class Codes: F24F 5/0021 using phase change material [PCM] for storage
• CPC Class Codes: H02J 50/00 Circuit arrangements or systems for wireless supply or distribution of electric power
• CPC Class Codes: H02J 50/001 Energy harvesting or scavenging
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: Y02E 60/14 Thermal energy storage

Abstract

A system for controlling a damper, comprising an energy harvesting device is disclosed. A voltage conditioning and storage unit coupled to the energy harvesting device, the voltage conditioning and storage unit configured to apply overvoltage and undervoltage protection to a storage capacitor. A controller coupled to the voltage conditioning and storage unit, the voltage conditioning and storage unit configured to apply overvoltage protection to the controller.

Claims

1. A system for controlling a damper, comprising:

an energy harvesting device;

a voltage conditioning and storage unit coupled to the energy harvesting device, the voltage conditioning and storage unit configured to apply overvoltage and undervoltage protection to a storage capacitor;

a controller coupled to the voltage conditioning and storage unit, the voltage conditioning and storage unit configured to apply overvoltage protection to the controller; and

a motor control coupled to the controller, wherein the controller is configured to monitor an energy level of the storage capacitor and to actuate the motor control to fully open a damper if the controller determines that an amount of energy remaining on the storage capacitor reaches a predetermined amount.

2. The system of claim 1 further comprising a transceiver coupled to the controller, wherein the controller is configured to execute one or more commands received from the transceiver.

3. The system of claim 1 wherein the voltage conditioning and storage unit comprises a controller overvoltage protection unit coupled to the energy harvesting device and configured to protect the controller from overvoltages generated by the energy harvesting device.

4. The system of claim 1 wherein the voltage conditioning and storage unit comprises a long term storage capacitor and a short term storage capacitor.

5. The system of claim 4 wherein the voltage conditioning and storage unit comprises a capacitor overvoltage protection unit coupled to the long term storage capacitor and the short term storage capacitor and configured to protect the long term storage capacitor and the short term storage capacitor from overvoltages generated by the energy harvesting device and undervoltages generated by a motor.

6. The system of claim 1 wherein the motor control further comprises a motor current threshold detector configured to compare a motor current to a reference value and to generate a motor current threshold signal.

7. The system of claim 1 wherein the motor control further comprises a motor position sensor configured to measure sensor position data from a sensor disposed on a motor shaft.

8. The system of claim 1 wherein the controller further comprises a wake, measure and transceiver unit configured to wake the controller from an inactive state, to measure one or more sensors, to transmit the measured sensor data and to receive control data in response to the transmitted measured sensor data.

9. The system of claim 1 wherein the controller further comprises a default open control configured to measure a remaining amount of energy in an energy storage device and to cause a motor to fully open a damper if the remaining amount of energy is equal to or less than a predetermined value.

10. The system of claim 1 wherein the controller further comprises a start-up calibration unit configured to perform a start-up calibration sequence to determine a fully open and fully closed position of a damper.

11. A method for controlling a damper, comprising:

generating energy using an energy harvesting device;

applying overvoltage and undervoltage protection to a storage capacitor;

storing the generated energy in the storage capacitor; and

applying overvoltage protection to a controller;

controlling an operation of a damper position motor with the controller; and

actuating a motor control to using the controller fully open a damper if the controller determines that an amount of energy remaining on the storage capacitor has reached a predetermined amount.

12. The method of claim 11 further comprising executing one or more commands received from a transceiver with a controller after waking the controller from a power saving state.

13. The method of claim 11 further comprising comparing a motor current to a reference value and to generate a motor current threshold signal.

14. The method of claim 11 further comprising measuring sensor position data from a sensor disposed on a motor shaft.

15. The method of claim 11 further comprising:

waking a controller from an inactive state;

measuring one or more sensors using the controller;

transmitting the measured sensor data from the controller using a transceiver; and

receiving control data at the controller in response to the transmitted measured sensor data.

16. The method of claim 11 further comprising:

measuring a remaining amount of energy in an energy storage device; and

causing a motor to fully open a damper if the remaining amount of energy is equal to or less than a predetermined value.

17. The method of claim 11 further comprising performing a start-up calibration sequence to determine a fully open and fully closed position of a damper.

18. In a system having an energy harvesting device, a voltage conditioning and storage unit coupled to the energy harvesting device, the voltage conditioning and storage unit configured to apply overvoltage and undervoltage protection to a storage capacitor, a controller coupled to the voltage conditioning and storage unit, the voltage conditioning and storage unit configured to apply overvoltage protection to the controller, a motor control coupled to the controller, wherein the controller is configured to actuate the motor control to fully open a damper if an amount of energy remaining on the storage capacitor reaches a predetermined amount, a transceiver coupled to the controller, wherein the controller is configured to execute one or more commands received from the transceiver, wherein the voltage conditioning and storage unit comprises a controller overvoltage protection unit coupled to the energy harvesting device and configured to protect the controller from overvoltages generated by the energy harvesting device, wherein the voltage conditioning and storage unit comprises a long term storage capacitor and a short term storage capacitor, wherein the voltage conditioning and storage unit comprises a capacitor overvoltage protection unit coupled to the long term storage capacitor and the short term storage capacitor and configured to protect the long term storage capacitor and the short term storage capacitor from overvoltages generated by the energy harvesting device and undervoltages generated by a motor, wherein the motor control further comprises a motor current threshold detector configured to compare a motor current to a reference value and to generate a motor current threshold signal, wherein the motor control further comprises a motor position sensor configured to measure sensor position data from a sensor disposed on a motor shaft, wherein the controller further comprises a wake, measure and transceiver unit configured to wake the controller from an inactive state, to measure one or more sensors, to transmit the measured sensor data and to receive control data in response to the transmitted measured sensor data, wherein the controller further comprises a default open control configured to measure a remaining amount of energy in an energy storage device and to cause a motor to fully open a damper if the remaining amount of energy is equal to or less than a predetermined value, and wherein the controller further comprises a start-up calibration unit configured to perform a start-up calibration sequence to determine a fully open and fully closed position of a damper, a method comprising:

generating energy using an energy harvesting device;

applying overvoltage and undervoltage protection to a storage capacitor;

storing the generated energy in the storage capacitor; and

applying overvoltage protection to a controller;

controlling an operation of a damper position motor with the controller;

actuating a motor control to fully open a damper if an amount of energy remaining on the storage capacitor reaches a predetermined amount;

executing one or more commands received from a transceiver with a controller after waking the controller from a power saving state;

comparing a motor current to a reference value and to generate a motor current threshold signal;

measuring sensor position data from a sensor disposed on a motor shaft;

waking a controller from an inactive state;

measuring one or more sensors using the controller;

transmitting the measured sensor data from the controller using a transceiver;

receiving control data at the controller in response to the transmitted measured sensor data;

measuring a remaining amount of energy in an energy storage device;

causing a motor to fully open a damper if the remaining amount of energy is equal to or less than a predetermined value; and

performing a start-up calibration sequence to determine a fully open and fully closed position of a damper.

19. A method for controlling a motor-driven actuator, comprising:

generating energy using an energy harvesting device selected from the group comprising a Peltier effect device, a microturbine and a solar photovoltaic cell;

applying overvoltage and undervoltage protection to a storage capacitor using an overvoltage and undervoltage protection circuit configured to measure a voltage level at one or more capacitor terminals and to disconnect the storage capacitor from the energy harvesting device if the voltage is greater than a first voltage level and to connect the storage capacitor to the energy harvesting device if the voltage level is lower than a second voltage level;

storing the generated energy in the storage capacitor; and

applying overvoltage protection to a controller using the overvoltage and undervoltage protection circuit configured to measure a voltage level at one or more controller terminals and to disconnect the controller from the storage capacitor if the voltage is greater than a third voltage level; and

controlling an operation of an actuator position motor with the controller as a function of the energy stored in the storage capacitor.