1. An electricity distribution system, comprising:
an AC feed line of a single phase three wire system for supplying an AC power to electrical devices;
a DC feed line of a three wire system for supplying a DC power to electrical devices; and
an AC-DC converter converting the AC power inputted from said AC feed line into the DC power outputted to said DC feed line,
wherein said AC-DC converter comprises an electrical circuit commonly connecting one of three wires of said DC feed line and a neutral wire of said AC feed line,
wherein said AC-DC converter is configured to apply a DC voltage to each of positive and negative voltage wires, said positive voltage wire having a positive electrical potential to an electrical potential of said neutral wire, said negative voltage wire having a negative electrical potential to the electrical potential of said neutral wire.
2. The electricity distribution system as claimed in claim 1,
wherein electrical devices receiving the AC power from said AC feed line and electrical devices receiving the DC power from said DC feed line are commonly connected to ground.
3. The electricity distribution system as claimed in claim 1,
further comprising a leak detector connected to said DC feed line,
wherein said leak detector comprises:
a series circuit of first and second resistors, both ends of said series circuit of first and second resistors being connected to said positive voltage wire and said negative voltage wire through first and second switches, respectively;
a series circuit of third and fourth resistors, one end of said series circuit of third and fourth resistors being connected to said positive voltage wire through a third switch, the other end of said series circuit of third and fourth resistors being connected to said negative voltage wire;
a series circuit of fifth and sixth resistors, one end of said series circuit of fifth and sixth resistors being connected to said positive voltage wire, the other end of said series circuit of fifth and sixth resistors being connected to said negative voltage wire through a fourth switch;
a seventh resistor, one end of said seventh resistor being connected to a connecting point of said first and second resistors;
a first diode, a cathode of said first diode being connected to a connecting point of said third and fourth resistors, an anode of said first diode being connected to the other end of said seventh resistor;
a second diode, an anode of said second diode being connected to a connecting point of said fifth and sixth resistors, a cathode of said second diode being connected to the other end of said seventh resistor; and
a detection control circuit configured to control each switch and to determine the presence or absence of an electrical leak based on electrical potential relationships between a first detection point, a second detection point, a third detection point and a fourth detection point and to interrupt said DC feed line upon detection of the electrical leak, said first detection point being a connecting point of said first and second resistors, said second detection point being a connecting point of said first and second diodes, said third detection point being a connecting point of said third and fourth resistors, said fourth detection point being a connecting point of said fifth and sixth resistors,
wherein resistance values of said first and second resistors are set to be equal to each other,
wherein resistance values of said third and sixth resistors are set to be less than resistance values of said first and second resistors,
wherein resistance values of said fourth and fifth resistors are set to be more than resistance values of said first and second resistors.
4. The electricity distribution system as claimed in claim 3,
further comprising a fifth switch for selecting either one of a first state where said first detection point is connected to ground, and a second state where said first detection point is not connected to ground,
wherein said detection control circuit is configured to detect an electrical leak of said DC feed line when said fifth switch selects said first state,
wherein said detection control circuit is configured to detect the presence of neutral wire phase interruption by means of comparing an electrical potential of said first detection point with an electrical potential of said neutral wire when said fifth switch selects said second state.
5. The electricity distribution system as claimed in claim 1,
wherein for electrical devices comprising a rectification circuit and a switching power circuit, said AC-DC converter is configured so that absolute values of voltages applied to said positive and negative voltage wires are set to be equal to each other, and to be within the range of a voltage being able to be used as an input voltage for said switching power circuit.
6. The electricity distribution system as claimed in claim 2,
further comprising a leak detector connected to said DC feed line,
wherein said leak detector comprises:
a series circuit of first and second resistors, both ends of said series circuit of first and second resistors being connected to said positive voltage wire and said negative voltage wire through first and second switches, respectively;
a series circuit of third and fourth resistors, one end of said series circuit of third and fourth resistors being connected to said positive voltage wire through a third switch, the other end of said series circuit of third and fourth resistors being connected to said negative voltage wire;
a series circuit of fifth and sixth resistors, one end of said series circuit of fifth and sixth resistors being connected to said positive voltage wire, the other end of said series circuit of fifth and sixth resistors being connected to said negative voltage wire through a fourth switch;
a seventh resistor, one end of said seventh resistor being connected to a connecting point of said first and second resistors;
a first diode, a cathode of said first diode being connected to a connecting point of said third and fourth resistors, an anode of said first diode being connected to the other end of said seventh resistor;
a second diode, an anode of said second diode being connected to a connecting point of said fifth and sixth resistors, a cathode of said second diode being connected to the other end of said seventh resistor; and
a detection control circuit configured to control each switch and to determine the presence or absence of an electrical leak based on electrical potential relationships between a first detection point, a second detection point, a third detection point and a fourth detection point and to interrupt said DC feed line upon detection of the electrical leak, said first detection point being a connecting point of said first and second resistors, said second detection point being a connecting point of said first and second diodes, said third detection point being a connecting point of said third and fourth resistors, said fourth detection point being a connecting point of said fifth and sixth resistors,
wherein resistance values of said first and second resistors are set to be equal to each other,
wherein resistance values of said third and sixth resistors are set to be less than resistance values of said first and second resistors,
wherein resistance values of said fourth and fifth resistors are set to be more than resistance values of said first and second resistors.
7. The electricity distribution system as claimed in claim 6,
further comprising a fifth switch for selecting either one of a first state where said first detection point is connected to ground, and a second state where said first detection point is not connected to ground,
wherein said detection control circuit is configured to detect an electrical leak of said DC feed line when said fifth switch selects said first state,
wherein said detection control circuit is configured to detect the presence of neutral wire phase interruption by means of comparing an electrical potential of said first detection point with an electrical potential of said neutral wire when said fifth switch selects said second state.
8. The electricity distribution system as claimed in claim 2,
wherein for electrical devices comprising a rectification circuit and a switching power circuit, said AC-DC converter is configured so that absolute values of voltages applied to said positive and negative voltage wires are set to be equal to each other, and to be within the range of a voltage being able to be used as an input voltage for said switching power circuit.
9. The electricity distribution system as claimed in claim 3,
wherein for electrical devices comprising a rectification circuit and a switching power circuit, said AC-DC converter is configured so that absolute values of voltages applied to said positive and negative voltage wires are set to be equal to each other, and to be within the range of a voltage being able to be used as an input voltage for said switching power circuit.
10. The electricity distribution system as claimed in claim 4,
wherein for electrical devices comprising a rectification circuit and a switching power circuit, said AC-DC converter is configured so that absolute values of voltages applied to said positive and negative voltage wires are set to be equal to each other, and to be within the range of a voltage being able to be used as an input voltage for said switching power circuit.
11. The electricity distribution system as claimed in claim 6,
wherein for electrical devices comprising a rectification circuit and a switching power circuit, said AC-DC converter is configured so that absolute values of voltages applied to said positive and negative voltage wires are set to be equal to each other, and to be within the range of a voltage being able to be used as an input voltage for said switching power circuit.
12. The electricity distribution system as claimed in claim 7,
wherein for electrical devices comprising a rectification circuit and a switching power circuit, said AC-DC converter is configured so that absolute values of voltages applied to said positive and negative voltage wires are set to be equal to each other, and to be within the range of a voltage being able to be used as an input voltage for said switching power circuit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A motion compensating apparatus comprising:
motion compensation processing means for receiving as inputs thereof an input image and a reference image to output a motion vector between the input image and the reference image, and an estimated image which is extracted in accordance with the reference image;
first luminancecolor difference separating means for separating an input image luminance signal and an input image color difference signal from the input image;
second luminancecolor difference separating means for separating an estimated image luminance signal and an estimated image color difference signal from the estimated image;
a first substracter for obtaining a difference between the input image color difference signal from said first luminancecolor difference separating means and the estimated image color difference signal from said second luminancecolor difference separating means;
a second substracter for obtaining a difference between the input image luminance signal from said first luminancecolor difference separating means and the estimated image luminance signal from said second luminancecolor difference separating means;
color difference evaluation value producing means for producing a color difference evaluation value on the basis of the output from said first subtracter;
luminance evaluation value producing means for producing a luminance evaluation value on the basis of the output from said second subtracter;
evaluation value calculating means for calculating an evaluation value for determination of an optimal vector on the basis of the color difference evaluation value from said color difference value producing means and the luminance evaluation value from said luminance evaluation value producing means; and
vector determining means for receiving as inputs thereof the motion vector and the evaluation value for determination of an optimal vector to output as an optimal vector the motion vector, in which the evaluation value for determination of an optimal vector is minimum, out of a plurality of motion vectors which can be selected.
2. The motion compensating apparatus according to claim 1, wherein said evaluation value calculating means comprises an adder for adding the color difference evaluation value from said color difference evaluation value producing means and the luminance evaluation value from said luminance evaluation value producing means to each other to obtain a total evaluation value, and wherein said vector determining means receives as inputs thereof said motion vector and a total addition value as the total evaluation value to output as an optimal vector the motion vector, in which said total evaluation value is minimum, out of a plurality of motion vectors which can be selected.