POWER CONTROL METHOD, POWER CONTROL DEVICE, AND IMAGE FORMING APPARATUS
First Claim
1. A power control method for performing phase control by using AC power supplied from an AC power supply, the method comprising:
- generating a zero-crossing signal that indicates a first level if an absolute value of AC voltage from the AC power supply is equal to or smaller than a predetermined value, and indicates a second level if the absolute value of the AC voltage is larger than the predetermined value;
detecting a zero-crossing width and a non-zero-crossing width of the zero-crossing signal, the zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or smaller than the predetermined value, the non-zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or larger than the predetermined value;
detecting a frequency and a voltage value of the AC voltage based on the zero-crossing width detected and the non-zero-crossing width detected; and
performing phase control depending on the frequency detected and the voltage value detected.
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Accused Products
Abstract
A power control method for performing phase control is provided. The method includes generating a zero-crossing signal that indicates a first level if an absolute value of AC voltage is smaller than a predetermined value, and indicates a second level if the absolute value of the AC voltage is larger than the predetermined value; detecting a zero-crossing width and a non-zero-crossing width, the zero-crossing width being a time width for a case where the absolute value of the AC voltage is smaller than the predetermined value, the non-zero-crossing width being a time width for a case where the absolute value is larger than the predetermined value; detecting a frequency and a voltage value of the AC voltage based on the zero-crossing width and the non-zero-crossing width; and performing phase control depending on the frequency and the voltage value.
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Citations
20 Claims
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1. A power control method for performing phase control by using AC power supplied from an AC power supply, the method comprising:
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generating a zero-crossing signal that indicates a first level if an absolute value of AC voltage from the AC power supply is equal to or smaller than a predetermined value, and indicates a second level if the absolute value of the AC voltage is larger than the predetermined value; detecting a zero-crossing width and a non-zero-crossing width of the zero-crossing signal, the zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or smaller than the predetermined value, the non-zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or larger than the predetermined value; detecting a frequency and a voltage value of the AC voltage based on the zero-crossing width detected and the non-zero-crossing width detected; and performing phase control depending on the frequency detected and the voltage value detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A power control device for performing phase control by using AC power supplied from an AC power supply, the device comprising:
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a zero-crossing signal generation portion configured to generate a zero-crossing signal that indicates a first level if an absolute value of AC voltage from the AC power supply is equal to or smaller than a predetermined value, and indicates a second level if the absolute value of the AC voltage is larger than the predetermined value; a signal width detection portion configured to detect a zero-crossing width and a non-zero-crossing width of the zero-crossing signal, the zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or smaller than the predetermined value, the non-zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or larger than the predetermined value; a switching portion configured to control ON or OFF of current flowing into a load when AC power from the AC power supply is supplied to the load; and a switching controlling portion configured to detect a frequency and a voltage value of the AC voltage based on the zero-crossing width detected and the non-zero-crossing width detected, to determine operation of the switching portion depending on the frequency detected and the voltage value detected, and to give a command to the switching portion.
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18. An image forming apparatus including a load to which AC power is supplied from an AC power supply and on which phase control is performed, the apparatus comprising:
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a zero-crossing signal generation portion configured to generate a zero-crossing signal that indicates a first level if an absolute value of AC voltage from the AC power supply is equal to or smaller than a predetermined value, and indicates a second level if the absolute value of the AC voltage is larger than the predetermined value; a signal width detection portion configured to detect a zero-crossing width and a non-zero-crossing width of the zero-crossing signal, the zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or smaller than the predetermined value, the non-zero-crossing width being a time width of the zero-crossing signal for a case where the absolute value of the AC voltage is equal to or larger than the predetermined value; a switching portion configured to control ON or OFF of current flowing into a load when AC power from the AC power supply is supplied to the load; and a switching controlling portion configured to detect a frequency and a voltage value of the AC voltage based on the zero-crossing width detected and the non-zero-crossing width detected, to determine operation of the switching portion depending on the frequency detected and the voltage value detected, and to give a command to the switching portion. - View Dependent Claims (19, 20)
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Specification