Simultaneous use of phase control and integral half cycle (IHC) control

Patent metadata

Field	Value
Publication number	US-10775725-B2
Application number	US-201716481368-A
Country	US
Kind code	B2
Filing date	Mar 31, 2017
Priority date	Mar 31, 2017
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

Controlling power delivered to a heating device occurs using a phase control, wherein the phase control includes changing a cut-off phase of an alternating current electrical signal delivered to the heating device. The power delivered to the heating device is increased from zero to an operational level using the phase control. The level of the power delivered to the heating device is maintained at the operational level using both the phase control and an integral half cycle control. The integral half cycle includes selectively removing a plurality of half cycles from the alternating current electrical signal delivered to the heating device.

First claim

What is claimed is:

1. A method comprising:
controlling power delivered to a heating device using a phase control that changes a cut-off phase of an alternating current electrical signal delivered to the heating device;
increasing the power delivered to the heating device from zero to an operational level using the phase control; and
maintaining a level of the power delivered to the heating device at the operational level using both the phase control and an integral half cycle control that selectively removes a plurality of half cycles from the alternating current electrical signal delivered to the heating device, comprising:
in each of a plurality of consecutively repeating sequences of first, second, and third consecutive sinusoidal half cycles from 0 to 180 degrees or from 180 degrees to 360 degrees, using the integral half cycle control in the first half cycle and using the phase control in the second and third half cycles.

2. The method of claim 1 , wherein the heating device comprises a first heating component and a second heating component, and wherein the method further comprises:
interleaving the phase control and the integral half cycle control on the first heating component to maintain a first power level delivered to the first heating component; and
interleaving the phase control and the integral half cycle control on the second heating component to maintain a second power level delivered to the second heating component.

3. The method of claim 1 , wherein the heating device comprises a first heating component and a second heating component, and wherein the method further comprises simultaneously using the phase control and the integral half cycle control on the first and second heating components to maintain a first power level delivered to the first heating component and a second power level delivered to the second heating component.

4. The method of claim 1 , further comprising using the heating device to heat a printable media in any of an electro-photographic printer, copier, and fax machine.

5. The method of claim 4 , wherein the heating component comprises a first heating component and a second heating component, and wherein the method further comprises:
using the first heating component to heat a center region of the printable media; and
using the second heating component to heat margin regions of the printable media.

6. The method of claim 1 , wherein the heating device comprises a plurality of heating components, and wherein a heating component of the plurality of heating components is electrically coupled to a triac device of a plurality of triac devices, and wherein the method further comprises triggering the triac device into and out of conduction to change the cut-off phase of the alternating current electrical signal delivered to the heating component.

7. The method of claim 1 , wherein maintaining the level of the power delivered to the heating device at the operational level using both the phase control and the integral half cycle control further comprises, in each consecutively repeating sequence of first, second, and third consecutive sinusoidal half cycles, using the phase control in the first half cycle in addition to the integral half cycle control.

8. A computer system comprising:
a processor; and
a memory comprising instructions executable by the processor to:
control power delivered to an electrical device using a phase control, wherein the electrical device comprises a first electrical component and a second electrical component, and wherein the phase control comprises changing a cut-off phase of an alternating current electrical signal delivered to any of the first and second electrical components;
increase the power delivered to the electrical device from zero to an operational power level of the electrical device using the phase control, wherein the operational power level comprises a first operational power level delivered to the first electrical component and a second operational power level delivered to the second electrical component; and
maintain the first operational power level delivered to the first electrical component by interleaving the phase control and an integral half cycle control on the first electrical component;
maintain the second operational power level delivered to the second electrical component by interleaving the phase control and the integral half cycle control on the second electrical component, wherein the integral half cycle control comprises selectively removing a plurality of half cycles from the alternating current electrical signal delivered to any of the first and second electrical component,

wherein the processor is to interleave the phase control and the integral half cycle control on each of the first and second electrical components by, in each of a plurality of consecutively repeating sequences of first, second, and third consecutive sinusoidal half cycles from 0 to 180 degrees or from 180 degrees to 360 degrees, using the integral half cycle control in the first half cycle and using the phase control in the second and third half cycles.

9. The system of claim 8 , wherein the instructions cause the processor to:
use the phase control to reduce flicker caused by the electrical device in an electrical grid coupled to the electrical device; and
use the integral half cycle to reduce harmonics caused by the electrical device in the electrical grid.

10. The computer system of claim 8 , wherein the processor is to interleave the phase control and the integral half cycle control on each of the first and second electrical components by, in each consecutively repeating sequence of first, second, and third consecutive sinusoidal half cycles, using the phase control in the first half cycle in addition to the integral half cycle control.

11. A system comprising:
a triac device configured to:
control, using a trigger signal of the triac device, power delivered to an electrical device using a phase control that changes a cut-off phase of an alternating current electrical signal delivered to the electrical device;
increase the power delivered to the electrical device from zero to an operational level using the phase control;

a controller configured to maintain a level of the power delivered to the electrical device at the operational level using both the phase control and an integral half cycle control that selectively removes a plurality of half cycles from the alternating current electrical signal delivered to the electrical device, by:
in each of a plurality of consecutively repeating sequences of first, second, and third consecutive sinusoidal half cycles from 0 to 180 degrees or from 180 degrees to 360 degrees, using the integral half cycle control in the first half cycle and using the phase control in the second and third half cycles.

12. The system of claim 11 , wherein the electrical device further comprises a first electrical component and a second electrical component, wherein the triac device comprises a first triac and a second triac electrically coupled to the first and second electrical components respectively, and wherein the controller is further configured to:
interleave the phase control and the integral half cycle control, via a first trigger signal of the first triac, on the first electrical component to maintain a first power level delivered to the first electrical component; and
interleave the phase control and the integral half cycle control, via a second trigger signal of the second triac, on the second electrical component to maintain a second power level delivered to the second electrical component.

13. The system of claim 11 , wherein the elect

Assignees

• Hewlett Packard Development Co

Inventors

• Hirst Mark

Classifications

• G05F1/455 Primary

  with phase control · CPC title

• G03G15/2039 Primary

  with means for controlling the fixing temperature · CPC title

• H05B1/0241

  For photocopiers · CPC title

• H05B1/0227

  Applications · CPC title

• H03K5/156

  Arrangements in which a continuous pulse train is transformed into a train having a desired pattern · CPC title