Power supply and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorJun Kawakatsu
Life of this patent
Estimating the term…
Abstract
The power supply apparatus comprising a generation unit configured to generate a pulse signal, a memory unit configured to store information set in advance on the driving frequency, and a determination unit configured to determine an error of the input voltage and an error of a load, to a piece of the information stored in the memory unit, a driving frequency detected by the detection unit under a state where a load is connected to the convertor, and based on a result of comparing, to a piece of the information stored in the memory unit, a driving frequency detected by the detection unit under a state where the load is not connected to the convertor.
Claims12
A power supply apparatus comprising a convertor having a transformer configured to isolate a primary side of the transformer from a secondary side of the transformer and being configured to convert an input voltage into an output voltage different from the input voltage and to supply the output voltage to a load, the power supply apparatus being configured to change the output voltage through control of a driving frequency of the transformer, wherein the power supply apparatus further includes:
- a generation circuit configured to generate a pulse signal based on a voltage induced on the secondary side of the transformer;
- a detection circuit configured to detect the driving frequency based on the pulse signal generated by the generation circuit;
- a memory configured to store information set in advance on the driving frequency;
- and
- a determination circuit configured to determine one of an error of the input voltage and an error of the load based on a result of comparing, to a piece of the information stored in the memory, a driving frequency detected by the detection circuit under a state where the load is connected to the convertor, and based on a result of comparing, to a piece of the information stored in the memory, a driving frequency detected by the detection circuit under a state where the load is not connected to the convertor.
An image forming apparatus, comprising:
- an image forming circuit configured to form an image on a recording material;
- and
- a power supply apparatus for supplying power to the image forming apparatus, the power supply apparatus comprising a convertor having a transformer configured to isolate a primary side of the transformer from a secondary side of the transformer and being configured to convert an input voltage into an output voltage different from the input voltage and to supply the output voltage to a load, the power supply apparatus being configured to change the output voltage through control of a driving frequency of the transformer,
- wherein the power supply apparatus further includes:
- a generation circuit configured to generate a pulse signal based on a voltage induced on the secondary side of the transformer;
- a detection circuit configured to detect the driving frequency based on the pulse signal generated by the generation circuit;
- a memory unit configured to store information set in advance on the driving frequency;
- and
- a determination circuit configured to determine one of an error of the input voltage and an error of the load based on a result of comparing, to a piece of the information stored in the memory, a driving frequency detected by the detection circuit under a state where the load is connected to the convertor, and based on a result of comparing, to a piece of the information stored in the memory, a driving frequency detected by the detection circuit under a state where the load is not connected to the convertor.
Dependencies are inferred from the claim text.