The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A welding-type power supply comprising:
a power circuit, including at least one switch having a control input;
a temperature sense circuit, disposed to sense a temperature produced by the at least one switch, and having a temperature output indicative of the sensed temperature;
a switch feedback circuit, disposed to sense at least one switch operating parameter, and having a switch feedback output signal responsive thereto; and
a controller, including a temperature circuit having as an input, and responsive thereto, the switch feedback output and the temperature output, and providing a control output, wherein the control input of the at least one switch is responsive to the control output.
2. The welding-type power supply of claim 1, wherein the at least one switch operating parameter includes current or a function thereof.
3. The welding-type power supply of claim 2, wherein the at least one switch operating parameter further includes voltage or a function thereof.
4. The welding-type power supply of claim 1, wherein the at least one switch operating parameter includes voltage or a function thereof.
5. The welding-type power supply of claim 1, wherein the temperature circuit includes a look-up table having as an index the at least one switch parameter, and wherein data in the look-up table includes temperature adjust values.
6. The welding-type power supply of claim 2, wherein the temperature circuit includes a look-up table having as an index the switch current, and wherein data in the look-up table includes temperature adjust values.
7. The welding-type power supply of claim 6, wherein the data includes temperature adjust values based on switch current and switch voltage.
8. The welding-type power supply of claim 1, wherein the temperature circuit includes a calculation circuit having as an input the switch feedback output, and having as an output a temperature that includes a temperature adjust value.
9. The welding-type power supply of claim 8, wherein the calculation output is a function of at least one of a switch current and a switch voltage.
10. The welding-type power supply of claim 1, wherein the temperature feedback circuit includes a thermal resistor.
11. A method of providing welding-type power comprising:
controlling a power circuit having at least one switch with a control input;
sensing a temperature produced by the at least one switch;
sensing at least one switch operating parameter, and providing a switch feedback output signal responsive thereto; and
reducing the output of the power circuit in the event the sensed temperature exceeds a corrected threshold, wherein the corrected threshold is responsive to the operating parameter.
12. The method of claim 11, wherein the at least one switch operating parameter includes current or a function thereof.
13. The method of claim 12, wherein the at least one switch operating parameter further includes voltage or a function thereof.
14. The method of claim 11, wherein the at least one switch operating parameter includes voltage or a function thereof.
15. The method of claim 11, further including retrieving a temperature that includes a temperature correction based on the operating parameter.
16. The method of claim 12, further including retrieving a temperature that includes a temperature correction based on the operating parameter.
17. The method of claim 16, wherein the temperature correction is from data including a switch current and a switch voltage.
18. The method of claim 11, further comprising calculating a temperature that includes a temperature adjust value in response to the operating parameter.
19. The method of claim 18, wherein the calculation is a function of at least one of a switch current and a switch voltage.
20. The method of claim 18, wherein the calculation is a function of a switch current and a switch voltage.
21. A welding-type power supply comprising:
power means for providing output power, including at least one switch means for switching in response to a control input;
temperature sense means for sensing a temperature produced by the at least one switch means and for providing a temperature output indicative of the sensed temperature;
feedback means for sensing at least one switch operating parameter and for providing switch feedback output signal responsive thereto; and
control means for controlling the power means, including means for receiving the switch feedback output signal and the temperature output, and for controlling the power means in response thereto, wherein the output of the power means is limited when the temperature produced exceeds a threshold responsive to the operating parameter.
22. The welding-type power supply of claim 21, wherein the feedback means includes means for sensing current.
23. The welding-type power supply of claim 22, wherein the feedback means further includes means for sensing voltage.
24. The welding-type power supply of claim 21, wherein the feedback means includes means for sensing voltage.
25. The welding-type power supply of claim 21, wherein the control means includes means for looking-up a temperature that includes a temperature adjust value in response to the switch feedback output signal.
26. The welding-type power supply of claim 21, wherein the control means includes means for calculating a temperature that includes a temperature adjust value in response to the switch feedback output signal.
27. The welding-type power supply of claim 1, wherein the feedback means includes a thermal resistor.
28. A welding-type power supply for providing welding-type power comprising:
means for controlling a power circuit having at least one switch with a control input;
means for sensing a temperature produced by the at least one switch, connected to the at least one switch;
means for sensing at least one switch operating parameter, and having a switch feedback output signal responsive thereto, connected to the at least one switch; and
means for reducing the output of the power circuit in the event the sensed temperature exceeds a corrected threshold.
29. The welding-type power supply of claim 38, wherein the at least one switch operating parameter includes current or a function thereof.
30. The welding-type power supply of claim 29, wherein the at least one switch operating parameter further includes voltage or a function thereof.
31. The welding-type power supply of claim 28, wherein the at least one switch operating parameter includes voltage or a function thereof.
32. The welding-type power supply of claim 28, further includes means for retrieving a temperature that includes a temperature correction based on the operating parameter.
33. The welding-type power supply of claim 29, further including means for retrieving a temperature that includes a temperature correction based on the operating parameter.
34. The welding-type power supply of claim 28, further comprising means for calculating a temperature that includes a temperature adjust value in response to the operating parameter.
35. The welding-type power supply of claim 34, wherein the means for calculating includes means for calculating as a function of at least one of a switch current and a switch voltage.
36. The welding-type power supply of claim 28, wherein the temperature feedback circuit includes a thermal resistor.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An optical writing control device that controls a light source that exposes a photoconductor to light to form an electrostatic latent image on the photoconductor, the optical writing control device comprising:
a light emission control unit that controls the light source to emit light to expose the photoconductor to light and to form an electrostatic latent image and an electrostatic latent correction pattern;
an optical sensor that detects a correction pattern on a conveying member, the correction pattern having been formed by toner on the conveying member by (a) developing the electrostatic latent correction pattern and (b) transferring the correction pattern from the photoconductor onto the conveying member,
the correction pattern having been configured for correcting a transfer position at which a toner image obtained by developing the electrostatic latent image formed on the photoconductor is transferred onto the conveying member and including an oblique line pattern inclined relative to a conveying direction of the conveying member;
a detection signal acquisition unit that acquires a detection signal from the optical sensor that detects the correction pattern formed by the toner on the conveying member;
a correction value calculation unit that calculates, on the basis of the detection signal, a correction value for correcting the transfer position; and
an angle adjustment processing unit that determines an angle of the oblique line pattern included in the correction pattern on the basis of a detection signal obtained by detecting an angle adjustment pattern by the optical sensor, the angle adjustment pattern including a plurality of continuous oblique line patterns having different inclinations relative to the conveying direction,
wherein the light emission control unit controls the light source to emit light so that a plurality of oblique line patterns having different inclinations relative to the conveying direction are continuously formed to draw the angle adjustment pattern, and controls the light source to emit light so that an oblique line pattern having the determined angle is formed in the correction pattern to draw the correction pattern.
2. The optical writing control device according to claim 1, wherein
the angle adjustment processing unit determines, as an angle of the oblique line pattern included in the correction pattern, an angle of an oblique line pattern having the largest detection intensity among detection signals obtained by detecting the angle adjustment pattern by the sensor.
3. The optical writing control device according to claim 2, wherein
when there are a plurality of oblique line patterns that are determined to have the largest detection intensity among detection signals obtained by detecting the angle adjustment pattern by the sensor, the angle adjustment processing unit determines, as an angle of the oblique line pattern included in the correction pattern, an angle of an oblique line pattern having the shortest period during which a detection signal detected by the sensor is varying in conveyance of the conveying member.
4. The optical writing control device according to claim 1, wherein
the light emission control unit controls the light source to emit light so that a correction pattern having a width corresponding to a detection range of the sensor in a main-scanning direction is drawn to draw the correction pattern.
5. The optical writing control device according to claim 1, wherein
the angle adjustment processing unit determines an angle of the oblique line pattern included in the correction pattern on the basis of a detection signal of the angle adjustment pattern that is drawn in a state in which position shift correction is previously performed.
6. The optical writing control device according to claim 5, wherein
the correction value calculation unit calculates a first correction value on the basis of a detection signal of the correction pattern that is drawn with a width having a margin with respect to a detection range of the sensor in the main-scanning direction and calculates a second correction value on the basis of a detection signal of a correction pattern that is drawn by applying the calculated first correction value and has a width corresponding to the detection range of the sensor in the main-scanning direction to perform the previous position shift correction.
7. The optical writing control device according to claim 1, wherein
the light emission control unit controls the light source to emit light so that a plurality of oblique line patterns having different inclinations within the range of 180\xb0 relative to the conveying direction are continuously formed to draw the angle adjustment pattern.
8. An image forming apparatus comprising the optical writing control device according to claim 1.
9. A method for controlling an optical writing device that controls a light source that exposes a photoconductor to light to form an electrostatic latent image on the photoconductor, the method comprising the steps of:
controlling the light source to emit light to expose the photoconductor to light, and to form an electrostatic latent image and an electrostatic latent correction pattern;
detecting a correction pattern on a conveying member with an optical sensor, the correction pattern having been formed by toner on the conveying member upon by (a) developing the electrostatic latent correction pattern and (b) transferring the correction pattern from the photoconductor onto the conveying member, using the correction pattern for correcting a transfer position at which a toner image obtained by developing the electrostatic latent image formed on the photoconductor is transferred onto the conveying member, the correction pattern including an oblique line pattern inclined relative to a conveying direction of the conveying member;
acquiring a detection signal from the optical sensor that detects the correction pattern formed by the toner on the conveying member;
calculating, on the basis of the detection signal, a correction value for correcting the transfer position; and
determining an angle of an oblique line pattern included in the correction pattern on the basis of a detection signal obtained by detecting the angle adjustment pattern by the optical sensor, the angle adjustment pattern including a plurality of continuous oblique line patterns having different inclinations relative to the conveying direction.