Control apparatus and control method of the same
AssigneeCanon Kabushiki Kaisha
InventorsShinya Ishikawa, Yasufumi Ogasawara, Hisao Okita, Takashi Sakai, Toru Oshika
Life of this patent
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Abstract
A control apparatus including a power supply unit configured to supply electric power, comprises: a capacitor connected to a power supply line extending from the power supply unit to a printhead; a discharge circuit configured to release charge stored in the capacitor; and a control unit configured to control a current value during a discharge operation by the discharge circuit, such that the current value increases as a voltage value of the capacitor decreases.
Claims12
A control apparatus including a power supply unit configured to supply electric power, comprising:
- a capacitor connected to a power supply line extending from the power supply unit to a printhead;
- a discharge circuit configured to release charge stored in the capacitor;
- and
- a control unit configured to control a current value during a discharge operation by the discharge circuit, such that the current value increases as a voltage value of the capacitor decreases, and
- wherein the control unit controls the current value during the discharge operation by the discharge circuit, such that an amount of generated heat of the discharge circuit, which is obtained based on a difference between the voltage value of the capacitor and GND, and the current value during the discharge operation by the discharge circuit, does not exceed an allowable loss of the discharge circuit.
A control method of a control apparatus which comprises:
- a power supply unit configured to supply electric power;
- a capacitor connected to a power supply line extending from the power supply unit to a printhead;
- and
- a discharge circuit configured to release charge stored in the capacitor,
- wherein the control method comprises:
- controlling a current value during a discharge operation by the discharge circuit, such that the current value increases as a voltage value of the capacitor decreases, and
- wherein the current value is controlled during the discharge operation by the discharge circuit, such that an amount of generated heat of the discharge circuit, which is obtained based on a difference between the voltage value of the capacitor and GND, and the current value during the discharge operation by the discharge circuit, does not exceed an allowable loss of the discharge circuit.
Dependencies are inferred from the claim text.