Voltage level detecting device, motor driving apparatus, motor driving system, and method for detecting voltage level

Patent metadata

Field	Value
Publication number	US-9991828-B2
Application number	US-201715434104-A
Country	US
Kind code	B2
Filing date	Feb 16, 2017
Priority date	Feb 29, 2016
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A voltage level detecting device is provided including comparators, a detection circuit, a trigger signal output circuit, a delayed control signal output circuit, a delayed comparison result signal output circuit, a circuit, and a control circuit. The comparators compare a voltage level of an input signal with each threshold level to generate and output a comparison result signal. The detection circuit detects a change in the comparison result signal and outputs a detection signal. The trigger signal output circuit outputs a trigger signal when a predetermined time has elapsed. The delayed control signal output circuit outputs a delayed control signal indicating a value of the control signal. The delayed comparison result signal output circuit outputs a delayed comparison result signal indicating the value of the comparison result signal. The circuit outputs a voltage level signal indicating a voltage level of the input signal. The control circuit outputs the control signal.

First claim

What is claimed is:

1. A voltage level detecting device comprising:
a plurality of comparators having a plurality of threshold levels different from each other based on a control signal and configured to compare a voltage level of an input signal to be changed with each threshold level to generate and output a comparison result signal indicating that the input signal has reached each threshold level;
a detection circuit configured to detect a change in the comparison result signal and output a detection signal;
a trigger signal output circuit configured to output a trigger signal when a predetermined time has elapsed after receiving the detection signal;
a delayed control signal output circuit configured to output a delayed control signal indicating a value of the control signal at the timing when the trigger signal has been received;
a delayed comparison result signal output circuit configured to output a delayed comparison result signal indicating the value of the comparison result signal at the timing when the trigger signal has been received;
a circuit configured to output a voltage level signal indicating a voltage level of the input signal based on the delayed control signal and the delayed comparison result signal; and
a control circuit configured to output the control signal based on the voltage level signal and the comparison result signal.

2. The voltage level detecting device according to claim 1 , wherein
the predetermined time is a time which exceeds an operation delay time of the plurality of comparators.

3. The voltage level detecting device according to claim 1 , wherein
the voltage level signal is a signal indicating a comparison result with the threshold level.

4. The voltage level detecting device according to claim 1 , wherein
the voltage level signal has an all zero bit in a state of a predetermined phase of the input signal and changes so as to sequentially increase from a lower order to a higher order of the voltage level signal.

5. The voltage level detecting device according to claim 4 , wherein
the voltage level signal is expressed by a gray code which changes by one bit at a change point of the voltage level signal.

6. A motor driving apparatus comprising:
the voltage level detecting device according to claim 1 ; and
an additional control circuit configured to drive and control a motor based on a phase detecting information signal detected based on the voltage level signal.

7. A motor driving system comprising:
the motor driving apparatus according to claim 6 ; and
a motor configured to be driven and controlled by the additional control circuit.

8. An image forming apparatus comprising:
the motor driving system according to claim 7 .

9. A conveyance device comprising:
the motor driving system according to claim 7 .

10. A method for detecting a voltage level, comprising:
comparing a voltage level of an input signal to be changed with each threshold level of a plurality of comparators having a plurality of threshold levels different from each other based on a control signal, to generate and output a comparison result signal indicating that the input signal has reached each threshold level;
detecting a change in the comparison result signal to output a detection signal;
outputting a trigger signal when a predetermined time has elapsed after receiving the detection signal;
outputting a delayed control signal indicating a value of the control signal at the timing when the trigger signal has been received;
outputting a delayed comparison result signal indicating the value of the comparison result signal at the timing when the trigger signal has been received;
outputting a voltage level signal indicating a voltage level of the input signal based on the delayed control signal and the delayed comparison result signal; and
outputting the control signal based on the voltage level signal and the comparison result signal.

11. The method according to claim 10 , wherein
the predetermined time is a time which exceeds an operation delay time of the plurality of comparators.

12. The method according to claim 10 , wherein
the voltage level signal is a signal indicating a comparison result with the threshold level.

13. The method according to claim 10 , wherein
the voltage level signal has an all zero bit in a state of a predetermined phase of the input signal and changes so as to sequentially increase from a lower order to a higher order of the voltage level signal.

14. The method according to claim 13 , wherein
the voltage level signal is expressed by a gray code which changes by one bit at a change point of the voltage level signal.

Assignees

• Kawahata Koji
• Tatebe Tetsuroh
• Ricoh Co Ltd

Inventors

• Kawahata Koji
• Tatebe Tetsuroh

Classifications

• H02P27/08

  with pulse width modulation · CPC title

• G03G21/14

  Electronic sequencing control · CPC title

• H02P6/16 Primary

  Circuit arrangements for detecting position · CPC title