# US 12,004,271 B2 · Power control device and power control method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,004,271 B2
- Document ID: US12004271B2
- Status: Granted
- Kind: B2
- Application number: 17/416,564
- Filed: 2019-06-28
- Published: 2022-03-17
- Granted: 2024-06-04
- Earliest claimed: 2018-12-25
- Assignees: Rkc Instrument Inc.
- Applicants: Rkc Instrument Inc.
- Inventors: Norikazu Yurugi; Tetsuya Murata
- Web page: https://patentgrep.com/patent/US12004271B2

## CPC

- H05B 3/0019: {Circuit arrangements}
- G01R 19/165: Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G05F 1/66: Regulating electric power
- H05B 1/023: {Industrial applications}
- H05B 3/22: non-flexible
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

## Abstract

Provided is a power control device 100 comprising: a current detector 31 that measures a combined current value obtained by combining currents flowing through a plurality of loads 1-4; and an output calculation unit 11 that calculates a correction value obtained by dividing a total value of products of operation output values for the loads 1-4 and rated current values of the loads 1-4, respectively, by the combined current value obtained by the current detector 31, and that performs power supply control for the loads 1-4 on the basis of a corrected operation output value that is a product of the operation output value and the correction value for each of the loads 1-4, in which in a system that heats or cools a workpiece by means of a plurality of loads, heating control or cooling control can be performed in which an effect of a fluctuation in load characteristics is reduced.

## Claims

### Claim 1

A power control device for controlling power supply to each of a plurality of loads in a system for heating or cooling a workpiece by the plurality of loads, the power control device comprising:
a current detector for measuring a combined current value wherein currents flowing through the plurality of loads are combined; and
an output calculation unit for calculating a correction value which is a value obtained by dividing a total value of a product of an operation output value for each of the loads and each rated current value of each of the loads by a combined current value obtained by the current detector, and controlling power supply to each of the loads based on a corrected operation output value which is a product of an operation output value for each of the loads and the correction value.

### Claim 2 (depends on 1)

The power control device according to claim 1, wherein an update process for updating the correction value is performed by a product of the correction value of a cycle before an applied cycle and a predetermined value for each predetermined cycle.

### Claim 3 (depends on 2)

The power control device according to claim 2, wherein the predetermined value is a value obtained by dividing a total value of a product of an operation output value for each of the loads and each rated current value of each of the loads by a combined current value obtained by the current detector.

### Claim 4 (depends on 2)

The power control device according to claim 2, wherein the predetermined value is a value obtained by adding 1 to a product of a ratio of increase and decrease of the correction value and an adjustment factor.

### Claim 5 (depends on 2)

The power control device according to claim 2, wherein the predetermined value is a sum of a value obtained by multiplying, by an adjustment factor, a value obtained by dividing a total value of a product of an operation output value for each of the loads and each rated current value of each of the loads by a combined current value obtained by the current detector, and a complement to the adjustment factor.

### Claim 6

A power control method for controlling power supply to each of a plurality of loads in a system for heating or cooling a workpiece by the plurality of loads, the power control method comprising the steps of:
measuring a combined current value wherein currents flowing through the plurality of loads are combined;
calculating a correction value which is a value obtained by dividing a total value of a product of an operation output value for each of the loads and each rated current value of each of the loads by the combined current value; and
controlling power supply to each of the loads based on a corrected operation output value which is a product of an operation output value for each of the loads and the correction value.