Mobile cart with capacitive power supply

• US 9,627,912 B2
• Filed: 12/18/2012
• Issued: 04/18/2017
• Est. Priority Date: 12/18/2012
• Status: Active Grant

• Current Assignee: Welch Allyn Incorporated
• Original Assignee: Welch Allyn Incorporated
• Inventors: Wood, Robert J., Edwards, Ian K., Lia, Raymond A., Salvati, Jon R., Vivenzio, Robert L., Mudge, Miguel C., Curry, Michael, St. Pierre, Shawn
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): Stables, David M
• Application Number:
  US13/718,869
• Publication Number:
  US 20140167506A1
• Time in Patent Office: 1,582 Days
• Field of Search: 307 25
• CPC Class Codes: A61B 2560/0209 adapted for power saving
• CPC Class Codes: A61B 2560/0214 of power generation or supply
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

A mobile system includes a mobile cart and an electronic device supported by the mobile cart. The mobile cart includes integral power storage structures that store electrical energy. The mobile cart also includes power supply electronics configured to supply the electrical energy to the electronic device to power the electronic device.

Claims

1. A mobile cart for an electronic device, the mobile cart comprising:

a stand having an outer perimeter;

a wheeled base section having an outer perimeter;

a vertical support structure centrally positioned relative to the stand and the wheeled base section and extending vertically intermediate the base and the stand, the vertical support structure having an outer perimeter smaller than the outer perimeter of either the stand or the wheel base section and configured to support a weight of the electronic device, the vertical support structure having an interior space;

a removably insertable support structure that is removably insertable within the vertical support structure;

a plurality of capacitor power storage devices coupled to the removably insertable support structure and presented in an arrangement in the interior space of the vertical support structure when the removably insertable support structure is inserted in the vertical support structure; and

power supply electronics including;

input circuitry configured to receive electrical energy from an external power source and to recharge the capacitor power storage devices; and

output circuitry configured to supply electrical energy from the capacitor power storage devices to power the electronic device supported by the mobile cart.

2. The mobile cart of claim 1, wherein the capacitor power storage devices are super capacitors or ultra capacitors.

3. The mobile cart of claim 1, wherein the capacitor power storage devices have capacities of greater than 100 Farads.

4. The mobile cart of claim 1, wherein the input circuitry further comprises an AC to DC converter.

5. The mobile cart of claim 4, wherein the input circuitry further comprises a voltage limiter configured to limit a maximum voltage supplied to the capacitor power storage devices.

6. The mobile cart of claim 4, wherein the input circuitry further comprises a current limiter configured to limit a maximum current supplied to the capacitor power storage devices.

7. The mobile cart of claim 1, wherein the input circuitry further comprises balancing circuitry configured to limit a maximum voltage applied to each of the capacitor power storage devices.

8. The mobile cart of claim 7, wherein the capacitor power storage devices are configured in banks of capacitors connected in parallel, wherein the banks of capacitors are connected in series with the other banks of capacitors, and further comprising series resistors connected to the positive terminal of each of the capacitors.

9. The mobile cart of claim 1, further comprising a storage region connected to the vertical support structure and including a second interior space, wherein the power supply electronics are at least partially contained within the second interior space of the storage region.

10. The mobile cart of claim 1, wherein the vertical support structure is a hollow cylindrical tube.

11. The mobile cart of claim 1, wherein the capacitor power storage devices collectively have a capacity in a range from 1,000 Farads to 50,000 Farads.

12. The mobile cart of claim 1, wherein the input circuitry further comprises a step-down controller.

13. The mobile cart of claim 1, wherein the output circuitry further comprises a boost converter.

14. The mobile cart of claim 13, wherein the boost converter comprises a buck-boost converter.

15. The mobile cart of claim 1, wherein the removably insertable support structure is removably insertable within the vertical support structure through an opening in the wheel base section.

16. A mobile system comprising:

a medical instrument; and

a mobile cart supporting the medical instrument, the mobile cart comprising;

a stand having an outer perimeter;

a wheeled base section having an outer perimeter;

a vertical support structure centrally positioned relative to the stand and the wheel base section and extending vertically intermediate the base and the stand, the vertical support structure having an outer perimeter smaller than the outer perimeter of either the stand or the wheel base section and configured to support the medical instrument in a spaced relationship to the base, the vertical support structure having an interior space;

a removably insertable support structure that is removably insertable within the vertical support structure;

a plurality of capacitor power storage devices coupled to the removably insertable support structure and presented in an arrangement in the interior space of the vertical support structure when the removably insertable support structure is inserted in the vertical support structure; and

power supply electronics including;

input circuitry configured to receive electrical energy from an external power source and to recharge the capacitor power storage devices; and

output circuitry electrically coupled to the medical instrument to supply electrical energy from the capacitor power storage devices to the medical instrument.

17. The mobile system of claim 16, wherein the medical instrument is a patient monitor.

18. The mobile system of claim 17, wherein the patient monitor is a vital signs monitor.

19. A method of powering an electronic device with a mobile cart, the method comprising:

receiving energy at the mobile cart from an external source;

storing the energy in capacitors, the capacitors being coupled to a removably insertable support structure that is inserted into a vertical support structure of the mobile carte, the removably insertable support structure operating to position the capacitors along an elongate vertical length of an interior space of the vertical support structure of the mobile cart, the vertical support structure configured to support a weight of the electronic device via central positioning of the vertical support structure relative to a stand and the wheel base section of the mobile cart, the stand configured to be placed beneath the electronic device;

converting the energy from the capacitors into a form suitable for delivery to the electronic device; and

supplying the energy to the electronic device from the mobile cart.

20. The method of claim 19, wherein receiving energy at the mobile cart occurs for a period of less than 15 minutes to recharge the capacitors from a substantially depleted state to a substantially fully charged state.