US 6,603,223 B2Granted

Electronic apparatus having dual-mode load circuit

AssigneeSeiko Instruments Inc.

InventorFumiyasu Utsunomiya

Life of this patent

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Abstract

An electronic apparatus for stably driving a load circuit having operating modes that are vastly different in consumed electric current values and current variations. A supply device supplies a first power. A voltage converting circuit produces a converted power by converting the first power. A control circuit outputs a control signal for controlling the voltage converting circuit and outputting a fourth power based on the converted power. The load circuit is driven by the fourth power and has first and second operating modes and outputs an operating mode signal to the control circuit indicating in which mode it is being operated. The control circuit has first and second output voltage control modes and selects in which of the first and second output voltage control modes an output voltage of the voltage converting circuit is controlled by the operating mode signal.

Claims19

Dependent claims

An electronic apparatus comprising:

an electricity supply device for supplying power;
a voltage converting circuit for converting the supplied power into a converted power having a different voltage from the supplied power, and outputting the converted power;
a control circuit for controlling the voltage converting circuit such that the converted power has a predetermined value;
and
a load circuit driven by the converted power;
wherein the control circuit has a first output voltage control mode and a second output voltage control mode, the second output voltage control mode having a consumed electric current smaller than that of the first output voltage control mode and a slower control speed than that of the first output voltage control mode;
the load circuit has a first operating mode and a second operating mode, the second operating mode having a consumed electric current smaller than that of the first operating mode;
and
the control circuit operates in the second output voltage control mode when the load circuit is in the second operating mode.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/863,843Filed 23 May 2001
Priority: JP 2001-15432423 May 2001
Published: US 2002/0030473 A114 Mar 2002
Granted: 5 Aug 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H02M 3/1584
Including plural semiconductor devices as final control devices for a single load: with a plurality of power processing stages connected in parallel
H02M 1/0032
Details of control, feedback or regulation circuits: control circuits allowing low power mode operation, e.g. in standby mode
H02M 3/07
Using resistors or capacitors, e.g. potential divider: using capacitors charged and discharged alternately by semiconductor devices with control…
Y02B 70/10
Technologies for an efficient end-user side electric power management and consumption: technologies improving the efficiency by using…