Drive Circuit with Integrated Power Factor Correction for Blender/Shaver Machine

• US 20120001002A1
• Filed: 03/15/2011
• Published: 01/05/2012
• Est. Priority Date: 03/15/2010
• Status: Active Grant

• Current Assignee: Moog Incorporated
• Original Assignee: Moog Incorporated
• Inventors: Flanary, Ronald, Donaldson, Scott B.
• Granted Patent: US 8,550,388 B2
• Time in Patent Office: Days
• US Class Current: 241/36
• CPC Class Codes: A47J 43/087 for machines with several driving units A47J43/09 takes precedence
• CPC Class Codes: A47J 44/00 Multi-purpose machines for preparing food with several driving units
• CPC Class Codes: H02M 1/4208 Arrangements for improving power factor of AC input

Abstract

Embodiments of the invention provide a machine that blends liquids and/or shaves ice. The machine includes a motor and a control system with an integrated power factor correction circuit and a drive circuit. The integrated power factor correction circuit receives input power from a mains power line, reduces noise transmitted to the mains power line, and provides a boosted, regulated output voltage. The drive circuit is connected to the motor and uses the regulated output voltage in order to control an effective voltage applied to the motor substantially independent of the voltage and frequency of the input power.

Claims

1. A machine that at least one of blends liquids and shaves ice, the machine comprising:

a motor that operates an impeller for one of blending liquid and shaving ice; and

a control system that controls the motor, the control system adapted to be connected to a mains power line and to receive inputs from a switch interface, the control system including

an integrated power factor correction circuit which receives input power from the mains power line, the integrated power factor correction circuit reducing noise transmitted to the mains power line and providing a boosted, regulated output voltage for use with the control system, and

a drive circuit connected to the motor, the drive circuit using the regulated output voltage in order to control an effective voltage applied to the motor based on the inputs from the switch interface substantially independent of the voltage and frequency of the input power.

2. The machine of claim 1, wherein the effective voltage applied to the motor is the regulated output voltage pulse-width modulated at a duty cycle.

3. The machine of claim 1, wherein the regulated output voltage is approximately 400 volts, direct current and the effective voltage applied to the motor is approximately 160 volts, direct current.

4. The machine of claim 1, wherein the regulated output voltage is approximately 400 volts, direct current and the effective voltage applied to the motor is approximately 400 volts, direct current.

5. The machine of claim 1, wherein the control system includes a microcontroller which controls the pulse width modulation of the drive circuit.

6. The machine of claim 5, wherein the microcontroller detects of records machine faults.

7. The machine of claim 1, wherein the mains power line is part of a power grid of an internal communication network.

8. The machine of claim 1, wherein the input power received from the mains power line is between approximately 100 volts, alternating current, and approximately 250 volts, alternating current.

9. The machine of claim 1, wherein the switch interface is a pushbutton panel.

10. The machine of claim 1, wherein the control system includes at least one motor overcurrent detection circuit.

11. The machine of claim 1, wherein the control system includes including at least one motor over-temperature detection circuit.

12. The machine of claim 1, wherein the control system includes a drive circuit over-temperature detection circuit.

13. The machine of claim 1, wherein the control system includes an under-voltage detection circuit for monitoring the regulated output voltage.

14. The machine of claim 1, wherein the motor includes a first motor that operates a first impeller for blending liquid and a second motor that operates a second impeller for shaving ice.

15. A blender comprising

a motor that operates an impeller;

and

a control system that controls the motor and is adapted to receive an input power, the control system including

an integrated power factor correction circuit which receives and regulates the input power, the integrated power factor correction circuit providing a regulated output voltage for use with the motor, and

a microcontroller in communication with the integrated power factor correction circuit and the motor, the microcontroller capable of detecting a high load condition on the motor, the microcontroller modulating the regulated output voltage from the integrated power factor correction circuit to provide a temporary burst of power in order to overdrive the motor and overcome the high load condition.

16. The blender of claim 15, wherein the microcontroller detects the high load condition by sensing a drop in motor speed.

17. The blender of claim 15, and further comprising a blender motor power stage in communication with the microcontroller and the integrated power factor correction circuit and controlling the motor.

18. A method for controlling a motor in a blender, the method comprising

receiving power from a mains power line;

boosting and regulating the received power using a power factor correction circuit in order to provide input power to the motor;

monitoring the speed of the motor;

determining a high load condition on the motor based on the monitored speed; and

providing a temporary increased input power to the motor in order to overdrive the motor and overcome the high load condition.

19. The method of claim 18, wherein the received power is in the range of about 100 volts, alternating current to about 250 volts, alternating current, and the input power is about 400 volts, direct current.

20. The method of claim 18, wherein the high load condition is determined by determining a decrease in the monitored speed.