HIGH POWER SUPPLY TO CONTROL AN ABNORMAL LOAD

• US 20090142081A1
• Filed: 02/04/2009
• Published: 06/04/2009
• Est. Priority Date: 09/29/2005
• Status: Active Grant

• Current Assignee: HP Printing Korea Co., Ltd. (HP Inc.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: HONG, Hyung-won
• Granted Patent: US 7,715,738 B2
• Time in Patent Office: Days
• US Class Current: 399/37
• CPC Class Codes: G03G 15/80 Details relating to power supplies, circuits boards, electrical connections

Abstract

A high power supply to control an abnormal load includes a high voltage power processor to amplify a supplied DC power and to output the amplified DC power, a trans/rectifier to transform the DC power to a high voltage power and to rectify the high voltage power, a load detector to compare a load voltage output from a load with a predetermined reference voltage and to output a comparison voltage to detect the abnormal load of the load, and a high voltage controller to supply a chip enable signal to the high voltage power processor to interrupt the high voltage power processor when the comparison voltage output from the load detector is smaller than a predetermined reference value that is set to correspond to a minimum load of the load. Therefore, a user and peripheral components an image forming apparatus are protected from electric shock and being damaged by interrupting an output of the high voltage according to the abnormal load.

Claims

1. An image forming apparatus, comprising:

a main body;

a load detachably installed in the main body; and

a high power supply to supply a high voltage to the load installed in the main body, to detect a normal load and an abnormal load from the load supplied with the high voltage, and to control the high voltage to be supplied to the load according to the detected normal or abnormal load.

2. The image forming apparatus of claim 1, further comprising:

a feedback unit to detect the high voltage to be supplied to the load and to generate a feedback signal according to the detected high voltage,

wherein to the high power supply comprises a unit to amplify an input voltage according to the feedback signal to control the amplified input voltage.

3. The image forming apparatus of claim 2, wherein the high power supply interrupts an input voltage corresponding to the high voltage according to the detected normal or abnormal load.

4. The image forming apparatus of claim 1, wherein the high power supply detects the load as the normal load when the load is attached to the main body, and detects the load as the abnormal load when the load is detected from the main body.

5. The image forming apparatus of claim 4, wherein the main body comprises a cover through which the load is installed in and detached from the main body, and the high power supply detects the load as the normal load and the abnormal load regardless of a state of the cover with respect to the main body.

6. The image forming apparatus of claim 1, wherein:

the high power supply comprises;

an HVPS ASIC unit to amplify an input voltage;

a trans/rectifier unit to generate the high voltage according to the amplified input voltage; and

a load detector to detect a state of the load as the normal load and the abnormal load, and

the HVPS ASIC unit interrupts an output of the high voltage according to the detected state of the load.

7. The image forming apparatus of claim 6, wherein:

the high power supply comprises a feedback unit to detect the high voltage; and

the HVPS ASIC unit amplifies the input voltage according to the detected high voltage.

8. The image forming apparatus of claim 6, wherein the HVPS ASIC unit is formed in a single monolithic integrated circuit chip.

9. The image forming apparatus of claim 8, wherein the HVPS ASIC unit comprises an interface to receive a signal corresponding to the input voltage, a programming interface to receive a second signal corresponding to the detected state of the load, a regulator to output a second signal to amplify the input signal according to the signal and the second signal.

10. The image forming apparatus of claim 6, wherein the load detector is disposed between the load and the load detector.

11. The image forming apparatus of claim 6, wherein the load is disposed between the load detector and the trans/rectifier unit.

12. The image forming apparatus of claim 6, wherein the load comprises a first terminal connected to the trans/rectifier unit and a second terminal connected to the load detector, and the load detector detects the state of the load according to at least one of a first connection state between the trans/rectifier unit and the first terminal of the load and a second connection state between the second terminal of the load and the load detector.

13. The image forming apparatus of claim 6, wherein the load comprises a first terminal connected to the trans/rectifier unit and a second terminal connected to the load detector, and the load detector detects the state of the load according to a voltage change in one of the first terminal and the second terminal.

14. The image forming apparatus of claim 1, further comprising:

a developing unit having one or more components of which includes the load to form a latent image, develop the latent image with a toner, form a toner image,

wherein the high power supply comprises;

an HVPS ASIC unit to amplify a first input voltage and a second input voltage to the high voltage and a second high voltage corresponding to the load and the one or more components, respectively;

a trans/rectifier unit to generate the high voltage and a second high voltage according to the amplified first and second input voltage to be supplied to the load and the one or more components, respectively; and

a load detector to detect a state of the load as the normal load and the abnormal load when the high voltage is supplied to at least one of the one or more components as the load, and

the HVPS ASIC unit interrupts an output of the high voltage according to the detected state of the load.

15. The image forming apparatus of claim 14, wherein the load comprises a developing roller as one of the one or more components to develop the latent image with the toner, and the load detector detects a state of the developing roller supplied with the high voltage.

16. An image forming apparatus, comprising:

a main body;

a load detachably installed in the main body; and

a high power supply to supply a high voltage to the load installed in the main body, and having a feedback unit to detect the high voltage to be supplied to the load to output a feedback signal, and a load detector to detect a normal load and an abnormal load from the load supplied with the high voltage to output a load detecting signal, and control the high voltage supplied to the load according to the feedback signal and the load detecting signal.