Digitally controlled power supply apparatus and production management system

Patent metadata

Field	Value
Publication number	US-10476386-B2
Application number	US-201715480371-A
Country	US
Kind code	B2
Filing date	Apr 6, 2017
Priority date	Apr 15, 2016
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A digitally controlled power supply apparatus includes: a switching device converting an input voltage to output a converted voltage based on gate signals that it has received; a smoothing circuit smoothing the converted voltage to output a power supply voltage; an AD converter AD converting the power supply voltage from the smoothing circuit to output a power supply voltage digital data; a PID controller performing PID control operation to an error between a setpoint and the power supply voltage digital data; a switching drive circuit generating gate signals, based on an operation outcome of the PID controller; a control parameter adjuster dynamically performing automatic adjustment of control parameters of the PID controller, based on a history of fluctuations indicated in samplings of the power supply voltage digital data; and a control parameter output unit outputting the control parameters of the PID controller.

First claim

What is claimed is:

1. A digitally controlled power supply apparatus, comprising:
a switching device for converting a given input voltage to output a converted voltage by being on/off driven in accordance with gate signals that the switching device receives;
a smoothing circuit for smoothing the converted voltage outputted by the switching device to output a power supply voltage;
an analog-digital converter for analog-digital converting the power supply voltage outputted by the smoothing circuit to output a power supply voltage digital data;
a Proportional-Integral-Derivative (PID) controller for performing PID control operation to an error between a setpoint and the power supply voltage digital data outputted by the analog-digital converter;
a switching drive circuit for generating gate signals for on/off driving the switching device, based on an operation outcome of the PID controller;
a control parameter adjuster for dynamically performing automatic adjustment of control parameters used for the PID control operation by the PID controller, based on a history of fluctuations indicated in samplings of the power supply voltage digital data;
a control parameter output unit for outputting the control parameters adjusted by the control parameter adjuster and used for the PID control operation by the PID controller; and
a control parameter determination unit for determining whether or not the control parameters outputted by the control parameter output unit satisfy a predetermined abnormality determination condition,
wherein the abnormality determination condition is based on a rate of change of at least one of the control parameters.

2. The digitally controlled power supply apparatus according to claim 1 , further comprising an alarm output unit for outputting a maintenance alarm when the control parameter determination unit has determined that the abnormality determination condition is satisfied.

3. A production management system, comprising:
a cell controller mutually communicably connected with a manufacturing cell including a plurality of manufacturing machines for controlling the manufacturing machines,
each of the plurality of manufacturing machines being equipped with a digitally controlled power supply apparatus comprising:
a switching device for converting a given input voltage to output a converted voltage by being on/off driven in accordance with gate signals that the switching device receives;
a smoothing circuit for smoothing the converted voltage outputted by the switching device to output a power supply voltage;
an analog-digital converter for analog-digital converting the power supply voltage outputted by the smoothing circuit to output a power supply voltage digital data;
a Proportional-Integral-Derivative (PID) controller for performing PID control operation to an error between a setpoint and the power supply voltage digital data outputted by the analog-digital converter;
a switching drive circuit for generating gate signals for on/off driving the switching device, based on an operation outcome of the PID controller;
a control parameter adjuster for dynamically performing automatic adjustment of control parameters used for the PID control operation by the PID controller, based on a history of fluctuations indicated in samplings of the power supply voltage digital data; and
a control parameter output unit for outputting the control parameters adjusted by the control parameter adjuster and used for the PID control operation by the PID controller; and

a production management apparatus mutually communicably connected with the cell controller, for giving an instruction of a production plan to the cell controller;
wherein at least one of the manufacturing machines, the cell controller and the production management apparatus comprises:
a control parameter determination unit for determining whether or not the control parameters outputted by the control parameter output unit satisfy an abnormality determination condition; and
an alarm output unit for outputting a maintenance alarm when the control parameter determination unit has determined that the predetermined abnormality determination condition is satisfied, and

wherein the abnormality determination condition is based on a rate of change of at least one of the control parameters.

4. A production management system, comprising:
a cell controller equipped with a digitally controlled power supply apparatus and mutually communicably connected with a plurality of manufacturing machines constituting a manufacturing cell, for controlling the manufacturing machines,
the digitally controlled power supply apparatus comprising:
a switching device for converting a given input voltage to output a converted voltage by being on/off driven in accordance with gate signals that the switching device receives;
a smoothing circuit for smoothing the converted voltage outputted by the switching device to output a power supply voltage;
an analog-digital converter for analog-digital converting the power supply voltage outputted by the smoothing circuit to output a power supply voltage digital data;
a Proportional-Integral-Derivative (PID) controller for performing PID control operation to an error between a setpoint and the power supply voltage digital data outputted by the analog-digital converter;
a switching drive circuit for generating gate signals for on/off driving the switching device, based on an operation outcome of the PID controller;
a control parameter adjuster for dynamically performing automatic adjustment of control parameters used for the PID control operation by the PID controller, based on a history of fluctuations indicated in samplings of the power supply voltage digital data; and
a control parameter output unit for outputting the control parameters adjusted by the control parameter adjuster and used for the PID control operation by the PID controller; and

a production management apparatus mutually communicably connected with the cell controller, for giving an instruction of a production plan to the cell controller;
wherein the production management apparatus comprises:
a control parameter determination unit for determining whether or not the control parameters outputted by the control parameter output unit satisfy a predetermined abnormality determination condition; and
an alarm output unit for outputting a maintenance alarm when the control parameter determination unit has determined that the abnormality determination condition is satisfied, and

wherein the abnormality determination condition is based on a rate of change of at least one of the control parameters.

5. A production management system, comprising:
a cell controller mutually communicably connected with a plurality of manufacturing machines constituting a manufacturing cell, for controlling the manufacturing machines; and
a production management apparatus mutually communicably connected with the cell controller, for giving an instruction of a production plan to the cell controller;
wherein at least one of the cell controller and the production management apparatus is equipped with a digitally controlled power supply apparatus comprising:
a switching device for converting a given input voltage to output a converted voltage by being on/off driven in accordance with gate signals that the switching device receives;
a smoothing circuit for smoothing the converted voltage outputted by the switching device to output a power supply voltage;
an analog-digital converter for analog-digital converting the power supply voltage outputted by the smoothing circuit to output a power supply voltage digital data;
a Proportional-Integral-Derivative (PID) controller for performing PID control operation to an error between a setpoint and the power supply voltage digita

Assignees

• Fanuc Corp

Inventors

• Goto Kazuya

Classifications

• H02M3/157 Primary

  with digital control · CPC title

• H02M3/156 Primary

  with automatic control of output voltage or current, e.g. switching regulators · CPC title

• G05B15/02

  electric · CPC title

• G05B11/42 Primary

  for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D. · CPC title

• Y02P90/86

  Cross-Sectional Technologies · mapped topic