Electric power conversion systems – Current conversion – With voltage division by storage type impedance
Reexamination Certificate
2000-08-18
2001-08-07
Sterrett, Jeffrey (Department: 2838)
Electric power conversion systems
Current conversion
With voltage division by storage type impedance
C363S126000, C363S146000
Reexamination Certificate
active
06272030
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to power supply apparatus used in an electronic apparatus like a television receiver, for example.
2. Description of the Related Art
Among recent television receivers and other electronic devices, those a remote-controller for improving the convenience have been distributed widely. Such a remote-controller includes a microprocessor as its central element, and includes various operation keys, encoder, light emitting section, and so forth. It is powered by a battery, for example, to code signals responsive to operation of various operation keys, output infrared control signals to an electronic apparatus to be controlled. In receipt of an infrared control signal, the electronic apparatus decodes the received signal and makes up detected information. Then, based on the detected information, it outputs a control signal for controlling each section and with a predetermined operation effected. For this purpose, such an electronic apparatus has a stand-by power supply in addition to its main power supply so that it can always cope with control signals sent from the remote-controller by supplying power to its photodetector and controller even when the power supply from the main power supply is stopped.
FIG. 9
shows a power supply apparatus of an electronic apparatus matching with a conventional remote-controller. In
FIG. 9
, a commercial alternating current (AC) is supplied to power input terminals shown by
101
a
and
101
b
. Numeral
108
denotes a rectifier bridge, and this rectifier bridge, smoothing capacitor and three-terminal regulator, which are not shown but connected to output terminals
109
a
and
109
b
, constitute a main power supply section.
Between the power input terminal
101
b
and the rectifier bridge
108
, a main switch
103
, a choke coil
106
b
and a switch
122
a
, forming a relay, are inserted in series.
Under the condition with the main switch
103
closed by manipulation of a user, when the switch
122
a
of the relay is turned ON, a rectified output is generated in the output terminals
109
a
and
109
b
, and smoothed, stabilized and thereafter supplied to a main load circuit, not shown.
On the other hand, numeral
121
denotes the load circuit of the control system. By making a standby power supply section from a voltage converting and rectifying circuit made up of an insulating transformer
111
, rectifier bridge
112
, three-terminal regulator
114
and two capacitors
113
,
115
, it is possible to supply a standby power supply to the control-system load circuit
121
and cope with a control signal sent from the remote-controller even when the relay switch
122
a
is turned OFF and the power supply from the main power supply is stopped.
When the main switch
103
is closed, a desired AC output is produced in the secondary coil
111
b
of the insulating transformer
111
, and this AC output is full-wave-rectified by the rectifier bridge
112
. Then, the full-wave-rectified output is smoothed by the capacitor
113
, and a direct current (DC) stabilized in 5V, for example, is generated at the output terminal of the three-terminal regulator
114
. This output voltage is supplied to LED
125
, photodetector
126
and microcomputer
127
, respectively, to activate the LED
125
, photodetector
126
and microprocessor
127
.
OBJECTS AND SUMMARY OF THE INVENTION
In the power supply apparatus of the conventional electronic device, as main power losses during standby periods, there are the excitation loss by the insulating transformer and the regulation loss of the three-terminal regulator. From the power-saving viewpoint, there is the demand for reducing these power losses in the standby periods.
According to the invention, there is provided a power supply apparatus connected to an alternating current to obtain a stabilized direct current voltage, comprising:
an AC voltage dividing means for dividing said AC voltage to a predetermined voltage including a first capacitor having one end connected to one of terminals of an alternating current and having a predetermined capacitance value, a second capacitor having one end connected to the other terminal of the alternating current and having a predetermined capacitance value, and a third capacitor having one end connected to the other end of the first capacitor and the other end connected to the other end of the second capacitor and having a predetermined capacitance value;
a rectifying and voltage-control means including a first rectifier element having a cathode connected to one end of the third capacitor and having a predetermined constant-voltage characteristic in a reverse voltage direction, a second rectifier element having a cathode connected to the other end of the third capacitor, an anode connected to the anode of said first rectifier element and a characteristic approximately equal to the first rectifier element in the backward voltage direction, a third rectifier element having an anode connected to one end of the third capacitor, and a fourth rectifier element having an anode connected to the other end of the third capacitor and a cathode connected to the cathode of the third rectifier element; and
a smoothing means for smoothing said DC voltage connected between a common connection point of the anodes of the first rectifier element and the second rectifier element and a common connection point of the cathodes of the third rectifier element and said fourth rectifier element.
In this embodiment, three capacitors having predetermined capacitance values are connected in series in an AC line, the rectifier bridge having two diodes whose reverse voltage characteristics are adjusted to a predetermined Zener voltage is connected in parallel with a capacitor located in the center, and a smoothing capacitor is connected to the rectifier bridge. As a result, it is possible to divide the AC voltage into a predetermined AC voltage and an isolate AC voltage at the same time. Additionally, it is possible to obtain a stabilized DC voltage with less ripples by clipping the AC voltage with the predetermined Zener voltage and smoothing it.
The above, and other, objects, features and advantage of the present invention will become readily apparent from the following detailed description thereof which is to be read in connection with the accompanying drawings.
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patent: 3379952 (1968-04-01), Tarrson
patent: 4109193 (1978-08-01), Schultheis
patent: 4626981 (1986-12-01), Su et al.
patent: 4982316 (1991-01-01), Nakayama
patent: 5615103 (1997-03-01), Steindam
patent: 5701244 (1997-12-01), Emmert et al.
patent: 5764205 (1998-06-01), Doyle et al.
patent: 5923147 (1999-07-01), Martensson
patent: 5995388 (1999-11-01), Preller
patent: 19600962 (1997-07-01), None
patent: 0317783 (1989-05-01), None
patent: 0626670 (1994-11-01), None
Da Grosse Wekbuch Elektronik, Nurmann, pp. 1197-1198, figure D, XP000910792, Jul. 2000.
Maioli Jay H.
Sony Corporation
Sterrett Jeffrey
LandOfFree
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