AC high voltage detecting device
OwnerChul-woo Oh, Jong-hwa Choinventors
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Abstract
An AC high voltage detecting device includes a high voltage power supply (HVPS) to convert a low voltage into an AC high voltage, a rectifier to rectify the converted AC high voltage into a positive voltage and a negative voltage, a voltage divider to divide the rectified positive voltage and the rectified negative voltage into a first voltage and a second voltage, respectively; and a detector to read out a sum component of the first and the second voltages to detect the AC high voltage in a DC level. Since the AC high voltage supplied from the high voltage power supply is detected after being converted into a DC voltage, there is no variance caused due to various devices required to detect an AC voltage.
Claims20
An AC high voltage detecting device comprising:
- a high voltage power supply (HVPS) to convert a low voltage into an AC high voltage;
- a rectifier to rectify the converted AC high voltage into a positive voltage and a negative voltage;
- a voltage divider to divide the rectified positive voltage and the rectified negative voltage into a first voltage and a second voltage, respectively;
- and
- a detector to read out a sum component of the first and the second voltages to detect the AC high voltage in a DC level.
An image forming apparatus using an AC high voltage detecting device comprising:
- a high voltage power supply (HVPS) to convert a low voltage into an AC high voltage;
- a rectifier to rectify the converted AC high voltage into a positive voltage and a negative voltage;
- a voltage divider to divide the rectified positive voltage and the rectified negative voltage into a first voltage and a second voltage, respectively;
- and
- a detector to read out a sum component of the first and the second voltages to detect the AC high voltage in a DC level.
An AC high voltage detecting device usable with an image forming apparatus to detect a voltage level of an AC high voltage generated by a high voltage power supply (HVPS), comprising:
- an AC-DC converter to convert the AC high voltage into a DC voltage;
- and
- a detector to detect a voltage level of the DC voltage as a sum component of a first and a second voltage of the AC-DC converter and to determine the voltage level of the AC high voltage based on the detected voltage level of the DC voltage.
An AC high voltage detecting device usable with an image forming apparatus to detect a voltage level of an AC high voltage generated by a high voltage power supply (HVPS), comprising:
- a rectifying unit to rectify the AC high voltage into one or more DC voltages;
- a dividing unit to divide the one or more DC voltages according to a predetermined ratio;
- and
- a detecting unit to detect voltage levels of the divided one or more DC voltages as a sum of a first voltage and a second voltage of the dividing unit and to determine the voltage level of the AC high voltage based on the detected voltage level of the divided one or more voltages.
An image forming apparatus, comprising:
- an electrophotographic image forming unit to form an image;
- a high voltage power supply (HVPS) to convert a low voltage into an AC high voltage and to output the AC high voltage to the electrophotographic image forming unit;
- an AC high voltage detecting unit to detect a voltage level of the AC high voltage output from the HVPS, including an AC-DC converter to convert the AC high voltage to a DC voltage and a detector to detect a voltage level of the DC voltage as a sum of first and second voltages of the AC-DC converter and to determine the voltage level of the AC high voltage based on the detected voltage level of the DC voltage.
A method of detecting a voltage level of an AC high voltage output from a high voltage power supply (HVPS), comprising:
- converting the AC high voltage into one or more DC voltages;
- dividing each of the one or more DC voltages according to a predetermined ratio;
- and
- detecting voltage levels of the divided one or more DC voltages as a sum of a first voltage and a second voltage of the divided one or more DC voltages and determining the voltage level of the AC high voltage based on the detected voltage levels of the divided one or more DC voltages.
Dependencies are inferred from the claim text.