Current detecting device, motor controlling system, image forming apparatus, sheet conveying device, robot, and current detecting method

Patent metadata

Field	Value
Publication number	US-2017190530-A1
Application number	US-201715397054-A
Country	US
Kind code	A1
Filing date	Jan 3, 2017
Priority date	Jan 6, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

A current detecting device includes: a drive signal generating unit configured to generate a control signal based on a control voltage value indicating drive force to be applied to a target; a current detecting unit configured to detect a current value output based on the control signal generated by the drive signal generating unit; and a correction unit configured to correct the current value detected by the current detecting unit, based on at least a magnitude of the control voltage value.

First claim

What is claimed is:

1 . A current detecting device comprising:
a drive signal generating unit configured to generate a control signal based on a control voltage value indicating drive force to be applied to a target; a current detecting unit configured to detect a current value output based on the control signal generated by the drive signal generating unit; and a correction unit configured to correct the current value detected by the current detecting unit, based on at least a magnitude of the control voltage value.

2 . The current detecting device according to claim 1 , further comprising a smoothing unit configured to smooth the current value output based on the control signal and detected by the current detecting unit.

3 . The current detecting device according to claim 1 , wherein the correction unit is configured to correct the current value detected by the current detecting unit, based on at least a magnitude of the control voltage value relative to a certain voltage value.

4 . The current detecting device according to claim 1 , wherein the control signal is a pulse width modulation signal.

5 . The current detecting device according to claim 4 , further comprising an averaging unit configured to perform averaging processing on the control signal that is the pulse width modulation signal,
the correction unit being configured to correct the current value detected by the current detecting unit, using the control signal on which the averaging processing has been performed.

6 . The current detecting device according to claim 1 , further comprising a pulse width detecting unit configured to binarize a current value corresponding to the control signal to be detected by the current detecting unit, and detect a pulse width of the binarized current value,
the correction unit being configured to correct the current value detected by the current detecting unit, using the pulse width detected by the pulse width detecting unit.

7 . The current detecting device according to claim 6 , further comprising an averaging unit configured to perform averaging processing on the pulse width detected by the pulse width detecting unit,
the correction unit being configured to correct the current value detected by the current detecting unit, using a pulse width obtained by performing the averaging processing by the averaging unit.

8 . The current detecting device according to claim 1 , wherein the current detecting unit includes a shunt resistor having one end connected to the drive signal generating unit and having the other end connected to the ground.

9 . The current detecting device according to claim 1 , wherein the current detecting unit includes a shunt resistor having one end connected to a power supply configured to drive the target and having the other end connected to the drive signal generating unit.

10 . A motor controlling system comprising:
a motor that is the target; and the current detecting device according to claim 1 .

11 . An image forming apparatus comprising:
an image processing unit configured to perform image processing; and the current detecting device according to claim 1 .

12 . A sheet conveying device comprising:
a mechanism configured to convey a sheet; and the motor controlling system according to claim 10 , the motor being configured to drive the mechanism configured to convey the sheet.

13 . A robot comprising:
a rotary drive mechanism; and the motor controlling system according to claim 10 , the motor being configured to drive the mechanism.

14 . A current detecting method comprising:
generating a control signal based on a control voltage value indicating drive force to be applied to a target; detecting a current value output based on the control signal generated at the generating; and correcting the current value detected at the detecting, based on at least a magnitude of the control voltage value.

15 . The current detecting method according to claim 14 , further comprising smoothing the current value output based on the control signal and detected at the detecting.

16 . The current detecting method according to claim 14 , wherein at the correcting, the current value detected at the detecting is corrected based on at least a magnitude of the control voltage value relative to a certain voltage value.

17 . The current detecting method according to claim 14 , wherein the control signal is a pulse width modulation signal.

18 . The current detecting method according to claim 17 , further comprising performing averaging processing on the control signal that is the pulse width modulation signal, wherein
at the correcting, the current value detected at the detecting is corrected using the control signal on which the averaging processing has been performed.

19 . The current detecting method according to claim 14 , further comprising binarizing a current value corresponding to the control signal to be detected at the detecting, and detecting a pulse width of the binarized current value, wherein
at the correcting, the current value detected at the detecting is corrected using the pulse width detected at the detecting.

20 . The current detecting method according to claim 19 , further comprising performing averaging processing on the pulse width detected at the detecting, wherein
at the correcting, the current value detected at the detecting is corrected using a pulse width obtained by performing the averaging processing at the performing.

Assignees

• Seki Takeo
• Suzuki Haruyuki
• Murata Takuya
• Kiguchi Hiroyuki
• Ricoh Co Ltd

Inventors

• Seki Takeo
• Suzuki Haruyuki
• Murata Takuya
• Kiguchi Hiroyuki

Classifications

• H02P6/28

  Arrangements for controlling current (H02P6/10 takes precedence) · CPC title

• G03G2215/0129

  horizontal medium transport path at the secondary transfer · CPC title

• H02P6/16

  Circuit arrangements for detecting position · CPC title

• G03G15/80 Primary

  Details relating to power supplies, circuits boards, electrical connections · CPC title

• G01R19/0092

  Measuring current only · CPC title