US 8,942,011 B2 · Power supply apparatus and image forming apparatus

Abstract

A power supply apparatus supplies regulated power to an external apparatus. A power switch is turned on to receive AC power and turned off not to receive the AC power. The AC power is rectified by a rectifying section and is switched by a switching section into switched DC power which is smoothed by a rectifying/smoothing section. Upon reception of an alarm signal, the power disconnecting section stops sending the switched DC power to the rectifying/smoothing section. If the AC switch is turned off and then back on again after stopping sending the switched DC power to the smoothing section, the power disconnecting section allows receiving of the AC power only a time after turn-off of the power switch. Upon reception of an auto-off signal indicative of an idle state of the external apparatus, an auto-off section does not send the switched DC power to the rectifying/smoothing section.

Drawings

Claims17

Dependent claims

A power supply apparatus, comprising:

a power switch turned on to receive first power and turned off not to receive the first power;
a power converting section for converting the first power into second power, the power converting section being in one of a first operation state where the power converting section normally operates in accordance with a drive signal to produce the second power and a second operation state where the power converting section stops operating to produce the second power;
a controller configured to operate at least on an output power, the controller switching the power converting section between the first operation state and the second operation state, the controller outputting the drive signal to the power converting section in the first operation state, and not outputting the drive signal to the power converting section in the second operation state;
and
a latching section that drives the controller not to output the drive signal for one of a first period of time and a second period of time so that the power converting section is in the second operation state, the latching section driving the controller not to output the drive signal for the first period of time shortly after the power switch is turned off following reception of an alarm signal indicative of an abnormality of an external apparatus from the external apparatus, and the latching section driving the controller not to output the drive signal for the second period of time shortly after the power switch is turned off following reception of a power saving signal from the external apparatus, the first period of time being longer than the second period of time.

2 more elements

Dependencies are inferred from the claim text.

Description14,339 words

Summary696 words

#1. Field of the Invention

#The present invention relates to a switching mode power supply apparatus and an image forming apparatus that incorporates the switching mode power supply apparatus.

#2. Description of the Related Art

Brief description of the drawings18 figures

#The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limiting the present invention, and wherein:

#FIG. 1 is a perspective view illustrating the general configuration of a print engine according to the invention;

#FIG. 2 is a block diagram illustrating a power supply apparatus as a comparative example;

Detailed description13,251 words

#The present invention will be described by way of embodiments. Various structures, systems and devices are schematically depicted in the drawings for purposes of explanation only and are not to limit the present invention to preferred embodiments.

#First Embodiment

#An image forming apparatus according to a first embodiment incorporates a flyback switching mode power supply apparatus and a printer that operates on DC power supplied from the flyback switching mode power supply apparatus.

Facts

Application

13/401,535Filed 21 Feb 2012

Priority

JP 2011-03597122 Feb 2011

Published

US 2012/0212980 A123 Aug 2012

Granted

27 Jan 2015

Term ends

12 Feb 2033

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 357 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification6 codes

G03G 15/5004
Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode…:…
B41J 29/38
Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for: drives, motors, controls or automatic…
B41J 29/393
Drives, motors, controls or automatic cut-off devices for the entire printing mechanism: devices for controlling or analysing the entire machine ;…
G03G 15/80
Apparatus for electrographic processes using a charge pattern: details relating to power supplies, circuits boards, electrical connections

Timeline

22 Feb 2011Priority claimedJP 2011-035971
21 Feb 2012Application filedUS 13/401,535
21 Feb 2012Assigned to Oki Data Corporationassignment of assignor's interest
23 Aug 2012PublishedUS 2012/0212980 A1
27 Jan 2015GrantedUS 8,942,011 B2
12 Oct 2026TodayWithin its term
12 Feb 2033Term endsEstimated, includes 357 days of adjustment

Power supply apparatus and image forming apparatus

Life of this patent

Power supply apparatus and image forming apparatus

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims17

Description14,339 words

Drawings

Description14,339 words

Classification6 codes

Life of this patent