JP4455355B2 - Non-contact power supply device and non-contact power supply system - Google Patents

Description

  The present invention is suitably used for power supply to a transport body or the like of a three-dimensional automatic warehouse, and supplies power received by a power receiving unit in a non-contact manner from a power supply line through one or more stages through another power supply line. The present invention relates to a non-contact power supply apparatus and a non-contact power supply system configured to do so.

A non-contact power receiving device that is used for power supply to a carrier in an automatic warehouse and that receives power in a non-contact manner from a power supply line laid in the area has been proposed by the applicant of the present application and has already been put into practical use. Yes.
In Patent Document 1, a high-frequency power received by a power receiving unit in a contactless manner from a power supply line is converted into a direct current, and then further converted into a high-frequency power by an inverter and supplied by another power supply line. A power supply circuit is disclosed. Further, there is disclosed a non-contact power supply circuit configured such that high-frequency power received by a power receiving unit from a power supply line in a contactless manner is further received via a transformer and supplied by another power supply line.
Japanese Patent No. 2929897

In the non-contact power supply circuit that converts the received high-frequency power into DC power and then converts it into high-frequency power using an inverter, the efficiency decreases due to the conversion from high-frequency power → DC power → high-frequency power, and the number of parts increases. There are problems such as reliability, lower reliability, and noise generated by the inverter.
Further, in a non-contact power supply circuit that further receives the received high-frequency power via a transformer and is supplied by another power supply line, a parallel resonance capacitor is connected in parallel to the pickup coil of the power receiving unit. In addition, since the transformer and a load such as a travel drive device are connected in parallel, there is a problem that when the load connected in parallel to the capacitor fluctuates, other power supply lines cannot supply a constant current.

  The present invention has been made in view of the above-described circumstances, is efficient, can eliminate the need for an inverter, has a small number of parts, does not generate noise, and can stably supply a constant current. Alternatively, it is an object of the present invention to provide a non-contact power feeding device and a non-contact power feeding system in which another power feeding line supplies power received by a power receiving unit in a non-contact manner from a power feeding line over a plurality of stages.

  The contactless power supply device according to the first aspect of the present invention is a power receiving power supply that receives power by resonating with the AC constant current in a contactless manner from a power supply line to which an AC constant current is supplied and supplies the received power to another power supply line. In the non-contact power supply apparatus having one or more stages, the power receiving and power feeding unit is configured to convert a power receiving circuit that receives power by resonating with an AC constant current, and AC power received by resonating with the power receiving circuit to an AC constant current. A constant current conversion circuit for conversion, and the AC constant current converted by the constant current conversion circuit is supplied to the other power supply line.

  In this non-contact power supply device, a power receiving / feeding unit including one or more stages receives power by resonating with an AC constant current in a non-contact manner from a power supply line to which an AC constant current is supplied, and further receives the received power. To supply. In the power receiving and feeding unit, the power receiving circuit resonates with AC constant current and receives power, and the constant current conversion circuit converts the received AC power into AC constant current and supplies it to other power supply lines.

  A contactless power supply device according to a second aspect of the present invention includes a constant voltage conversion circuit that converts an AC constant current flowing through the other power supply line into an AC constant voltage, and a rectifier circuit that rectifies the AC constant voltage converted by the constant voltage conversion circuit. And a smoothing circuit for smoothing the output of the rectifier circuit.

  In this non-contact power supply device, the constant voltage conversion circuit converts AC constant current power flowing through another power supply line into an AC constant voltage, and a rectifier circuit rectifies the AC constant voltage converted by the constant voltage conversion circuit. . The smoothing circuit smoothes the output of the rectifier circuit.

  In the non-contact power feeding device according to a third aspect of the invention, the power receiving circuit is a series resonance circuit in which a pickup coil and a capacitor are connected in series, and the constant current conversion circuit is an immittance conversion circuit.

  A contactless power supply device according to a fourth aspect of the present invention is a power receiving power supply that receives power by resonating with the AC constant current in a contactless manner from a power supply line to which an AC constant current is supplied, and supplies the received power to another power supply line. In the non-contact power feeding device including one or more stages, the power receiving power feeding unit is a parallel resonance circuit in which a series circuit of a pickup coil, a first capacitor and a reactor, and a second capacitor are connected in parallel, and the parallel resonance circuit The circuit is configured to convert AC power received through resonance into an AC constant current and supply the AC power to the other power supply line.

  In this non-contact power supply device, a power receiving / feeding unit including one or more stages receives power by resonating with an AC constant current in a non-contact manner from a power supply line to which an AC constant current is supplied, and further receives the received power. To supply. The power receiving and feeding unit is a parallel resonant circuit in which a series circuit of a pickup coil, a first capacitor, and a reactor and a second capacitor are connected in parallel. The parallel resonant circuit converts AC power that has been resonated and received into an AC constant current. Convert and supply to other feeders.

  The contactless power supply system according to a fifth aspect of the present invention includes a power supply line to which an alternating constant current is supplied, and receives the power from the power supply line. The power supply unit includes one or a plurality of other power supply lines that supply an alternating constant current.

  In this non-contact power supply system, an AC constant current is supplied to the power supply line, the power receiving power supply unit described in any one of claims 1 to 4 receives power from the power supply line, and the power receiving power supply unit receives the AC constant current. Supply to other feeders.

  According to the non-contact power feeding device according to the first, third, and fourth aspects of the invention, the AC constant current can be stably supplied with good efficiency, no need for an inverter, a small number of parts, no noise, and 1 Alternatively, it is possible to realize a non-contact power feeding device that supplies power received by the power receiving unit in a non-contact manner from the power feeding line to another power feeding line over a plurality of stages.

  According to the non-contact power feeding device according to the second aspect of the present invention, it is efficient, no inverter is required, the number of parts is small, no noise is generated, and a constant current can be stably supplied over one or more stages. Thus, it is possible to realize a non-contact power feeding device that supplies the power received by the power receiving unit in a contactless manner from the power feeding line to another power feeding line and operates the load by the power received by the power receiving unit.

  According to the non-contact power feeding system according to the fifth aspect of the present invention, the efficiency is good, the inverter is unnecessary, the number of parts is small, no noise is generated, and a constant current can be stably supplied. Thus, it is possible to realize a non-contact power feeding system that supplies the power received by the power receiving unit in a non-contact manner from the power feeding line to another power feeding line.

Hereinafter, the present invention will be described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing the main configuration of Embodiment 1 of a non-contact power supply apparatus and a non-contact power supply system according to the present invention. In this non-contact power supply system, a high frequency power supply circuit 1 (AC power supply) passes a high frequency constant current of a predetermined frequency through, for example, an X-axis power supply line 2 laid in an automatic warehouse. The high-frequency constant current flowing through the X-axis power supply line 2 is received by electromagnetic induction in a non-contact state by the X bearing power supply unit 4 (power receiving power supply unit). The X-bearing power supply section 4 is attached to the X-axis power supply line 2 so that it can be freely moved along the X-axis power supply line 2.

The X bearing power unit 4 is connected in series to the constant current conversion circuit unit 6 that converts the electric power received from the X-axis power supply line 2 into a high frequency constant current, and the constant current conversion circuit unit 6. The constant voltage conversion circuit 7 that converts the high frequency constant current into the high frequency constant voltage, the rectifier circuit 10 that includes the diode bridge that rectifies the high frequency constant voltage converted by the constant voltage conversion circuit 7, and the smoothing that smoothes the output of the rectification circuit 10 And a capacitor (smoothing circuit) C5. The DC power smoothed by the smoothing capacitor C5 is applied to a load 5 that is a motor or the like for moving a carrier in an automatic warehouse, for example.
The constant voltage conversion circuit 7 is a π-type immittance conversion circuit (impedance conversion circuit) in which a reactor L3 is connected between two capacitors C3 and C4 connected in parallel.

  The high-frequency constant current converted by the constant current conversion circuit unit 6 and passed through the constant voltage conversion circuit 7 is applied to, for example, the Y axis feed line 3 orthogonal to the X axis feed line 2. The high-frequency constant current flowing through the Y-axis power supply line 3 is received by electromagnetic induction in a non-contact state by the Y bearing power supply unit 8. The Y-bearing power supply unit 8 is attached to the Y-axis power supply line 3 so as to be freely movable along the Y-axis power supply line 3.

The Y-bearing power section 8 is a high-frequency constant circuit for the high-frequency power received by the parallel resonant circuit including the pickup coil L4 and the capacitor C6 that resonates and receives the high-frequency constant current flowing through the Y-axis power supply line 3. It is equipped with a constant voltage conversion circuit that converts voltage. This constant voltage conversion circuit is a π-type immittance conversion circuit in which a reactor L5 is connected between two parallel-connected capacitors C7 and C8.
The Y-bearing electrical section 8 also includes a rectifier circuit 11 including a diode bridge that rectifies a high-frequency constant voltage converted by a constant voltage conversion circuit including capacitors C7 and C8 and a reactor L5, and a smoothing capacitor that smoothes the output of the rectifier circuit 11. C9. The DC power smoothed by the smoothing capacitor C9 is applied to a load 9, which is a motor or the like that moves a carrier in an automatic warehouse, for example.

  FIG. 2A is a circuit diagram showing an internal configuration of the constant current conversion circuit unit 6 of the X bearing electrical unit 4. The constant current conversion circuit unit 6 includes a series resonance circuit including a pickup coil Lp and a capacitor C1 that resonates and receives a high-frequency constant current flowing through the first-stage power supply line (X-axis power supply line) 2, and the series resonance circuit. And a constant current conversion circuit for converting the high frequency constant voltage received by the device into a high frequency constant current.

This constant current conversion circuit is a T-type immittance conversion circuit in which a capacitor C2 is connected between two reactors L1 and L2 connected in series to the capacitor C1 and a terminal not connected to the capacitor C1 of the pickup coil Lp. Impedance conversion circuit). The constant current conversion circuit may be another immittance conversion circuit, for example, an impedance converter as disclosed in JP-A-8-305450 and JP-A-10-91254. good.
The high-frequency constant current converted by the constant current conversion circuit including the capacitor C2 and the reactors L1 and L2 is applied to the second-stage power supply line (Y-axis power supply line) 3 including the constant voltage conversion circuit 7.

Below, operation | movement of the non-contact electric power feeding system of such a structure is demonstrated.
The pickup coil Lp of the constant current conversion circuit unit 6 shown in FIG. 2A is represented by an L-type equivalent circuit using a transformer, and a high-frequency constant current is supplied to the primary side. If the feed line 2) is omitted, an equivalent circuit shown in FIG.
Here, Lp1 is an excitation inductance of the pickup coil Lp, Lp2 is a leakage inductance of the pickup coil Lp, V1 is a pickup unit (constant voltage conversion circuit) 6a composed of Lp1, Lp2, and C1 applied to both ends of the excitation inductance Lp1. The input voltage I1 is a high-frequency constant current input to the pickup unit 6a.

V2 is an output voltage of the pickup unit 6a, an input voltage of the impedance conversion circuit 6b including the capacitor C2 and the reactors L1 and L2, and I2 is an output current of the pickup unit 6a, and an input current of the impedance conversion circuit 6b. , V3 is an output voltage of the impedance conversion circuit 6b, and I3 is an output current of the impedance conversion circuit 6b.
The input / output of the pickup unit 6a is as shown in equation (1). (Ω is the angular frequency of the input voltage V1 of the pickup unit 6a)

here,
1−ω ² (Lp1 + Lp2) · C1 = 0 (resonance condition)
If,
I1 = (1 / jωLp1) · V2
∴V2 = jωLp1 ・ I1
Therefore, since I1 is a constant current, the output voltage V2 of the pickup unit 6a becomes an AC constant voltage.
Further, the input / output of the impedance conversion circuit 6b is expressed by equation (2).

here,
L1 = L2
1−ω ² L1C2 = 0 (resonance condition)
If,
V2 = jωL1 · I3
∴I3 = V2 / jωL1
Therefore, since V2 is an AC constant voltage, the output current I3 of the impedance conversion circuit 6b becomes an AC constant current regardless of the load viewed from the output terminal of the impedance conversion circuit 6b.
Also, from formulas (1) and (2)

I1 = (L1 / Lp1) · I3
∴I3 = (Lp1 / L1) · I1
Accordingly, by appropriately selecting L1, the output current I3 of the impedance conversion circuit 6b can be set to an arbitrary AC constant current.
Also, from equation (2), I2 = jωC2 · V3
Here, when the load viewed from the output terminal of the impedance conversion circuit 6b is R,
I2 = jωC2, R, I3
Since I3 is a constant current, the output current I2 of the pickup unit 6a is directly proportional to the load R.

In the equivalent circuit shown in FIG. 2B, Lp2, C1, and L1 are
ω (Lp2 + L1) -1 / ωC1
= (Ω (Lp1 + Lp2) -1 / ωC1) + ω (L1-Lp1)
It becomes. Here, since the first term ω (Lp1 + Lp2) −1 / ωC1 = 0 (resonance condition),
ω (Lp2 + L1) −1 / ωC1 = ω (L1−Lp1)
Therefore, if ω (L1−Lp1) ≧ ωLp2, as shown in the equivalent circuit of FIG. 3A, C1 and L1 are set to ωL1 ′ = ω (L1−Lp1−Lp2).
It is possible to substitute only the inductance L1 ′.

Similarly, if ω (L1−Lp1) <ωLp2, C1 and L1 are set to ωC1 ′ = 1 / ω (Lp1 + Lp2−L1).
It is possible to substitute only the capacitance C1 ′.
Similarly, C1 and L1 can be replaced with a combination of inductance and capacitance such that the combined impedance is ω (L1−Lp1).

Further, as shown in the equivalent circuit of FIG. 3B, the inductance Lf or part of the inductance Lf of the second-stage power supply line (Y-axis power supply line) 3a can also serve as L2. When the inductance Lf is larger than L2, as shown in the equivalent circuit of FIG. 3C, it is possible to connect the compensation capacitor Cc in series so that the combined impedance of Cc and Lf becomes L2.
It is also possible to substitute L2 for all combinations of inductance and capacitance with a combined impedance of L2 on the second-stage feeder line 3a side of C2.

  In such a non-contact power supply system, the pickup coil Lp and the capacitor C1 of the constant current conversion circuit unit 6 resonate with the high frequency constant current flowing through the X-axis power supply line 2 and receive the high frequency constant voltage. The received high-frequency constant voltage is converted into a high-frequency constant current by the impedance conversion circuit 6b including the capacitor C2 and the reactors L1 and L2 of the constant-current conversion circuit unit 6, and is transferred to the constant-voltage conversion circuit 7 and the Y-axis power supply line 3. Supplied.

The constant voltage conversion circuit 7 converts the supplied high frequency constant current into a high frequency constant voltage, and the converted high frequency constant voltage power is rectified by the rectifier circuit 10, smoothed by the smoothing capacitor C5, and converted to direct current. , Supplied to the load 5.
On the other hand, the pickup coil L4 and the capacitor C6 of the Y-bearing power section 8 resonate with the high-frequency constant current supplied to the Y-axis feed line 3, and receive the received power from the capacitors C7 and C8 and the reactor L5. Is converted into a high-frequency constant voltage. The converted high-frequency constant voltage is rectified by the rectifier circuit 11, smoothed by the smoothing capacitor C 9, converted into direct current, and supplied to the load 9.

(Embodiment 2)
FIG. 4 is a block diagram showing the main configuration of the second embodiment of the non-contact power supply apparatus and the non-contact power supply system according to the present invention. In this non-contact power supply system, a high-frequency constant current flowing through the X-axis power supply line 2 is received by electromagnetic induction by the X bearing power unit 4a in a non-contact state. The X-bearing power supply portion 4 a is attached to the X-axis power supply line 2 so that it can be freely moved along the X-axis power supply line 2.

  The X-bearing power supply unit 4a converts the received high-frequency constant voltage into a high-frequency constant current, and converts the received high-frequency constant voltage into a high-frequency constant current. A constant current conversion circuit 6b supplied to the rectifier, a rectifier circuit 10 connected in parallel to the constant voltage conversion circuit 6a and rectifying the high frequency constant voltage received by the constant voltage conversion circuit 6a, and an output of the rectification circuit 10 smoothed And a smoothing capacitor (smoothing circuit) C5. The DC power smoothed by the smoothing capacitor C5 is applied to a load 5 that is a motor or the like for moving a carrier in an automatic warehouse, for example. Since other configurations are the same as the main configuration of the first embodiment of the contactless power supply device and the contactless power supply system according to the present invention described above, the same portions are denoted by the same reference numerals and description thereof is omitted. .

In the non-contact power supply system having such a configuration, the pickup coil Lp and the capacitor C1 of the constant voltage conversion circuit 6a resonate with the high frequency constant current flowing through the X-axis power supply line 2 to receive the high frequency constant voltage. The received high-frequency constant voltage is converted into a high-frequency constant current by an impedance conversion circuit including a capacitor C2 and reactors L1 and L2 of the constant-current conversion circuit 6b, and is supplied to the Y-axis power supply line 3.
The high frequency constant voltage received by the constant voltage conversion circuit 6 a is rectified by the rectifier circuit 10, smoothed by the smoothing capacitor C 5, converted into DC power, and supplied to the load 5. Since other operations are the same as the operations of the first embodiment of the contactless power supply device and the contactless power supply system according to the present invention described above, description thereof will be omitted.

(Embodiment 3)
FIG. 5 is a block diagram showing a main configuration of a third embodiment of the non-contact power feeding device and the non-contact power feeding system according to the present invention. In this non-contact power supply system, a high-frequency constant current that flows through the X-axis power supply line 2 is received by the X bearing power units 4b and 4c by electromagnetic induction in a non-contact state. The X-bearing electric parts 4b and 4c are attached to the X-axis power supply line 2 so that they can be moved together integrally along the X-axis power supply line 2.

The X bearing power unit 4 b includes a constant current conversion circuit unit 6 that converts a high frequency constant voltage received from the X axis power supply line 2 into a high frequency constant current and supplies the high frequency constant current to the Y axis power supply line 3.
The X-bearing power section 4c is a high-frequency constant circuit that includes a parallel resonant circuit including a pickup coil L6 and a capacitor C10 that receive power by resonating with a high-frequency constant current flowing through the X-axis feed line 2, and high-frequency power received by the parallel resonant circuit. It is equipped with a constant voltage conversion circuit that converts voltage. This constant voltage conversion circuit is a π-type immittance conversion circuit in which a reactor L7 is connected between two parallel-connected capacitors C11 and C12.

  The X-bearing electrical unit 4c also smoothes the output rectified by the rectifier circuit 10 including the diode bridge that rectifies the high-frequency constant voltage converted by the constant voltage conversion circuit including the capacitors C11 and C12 and the reactor L7. And a smoothing capacitor C13. The DC power smoothed by the smoothing capacitor C13 is applied to a load 5 which is a motor or the like for moving a carrier in an automatic warehouse, for example. Since other configurations are the same as the main configuration of the first embodiment of the contactless power supply device and the contactless power supply system according to the present invention described above, the same portions are denoted by the same reference numerals and description thereof is omitted. .

In the non-contact power supply system having such a configuration, the constant current conversion circuit unit 6 receives power by resonating with the high frequency constant current flowing through the X-axis power supply line 2 and converts it into high frequency constant current power, thereby supplying the Y axis supply. The electric wire 3 is supplied.
The high frequency power received by the parallel resonance circuit composed of the pickup coil L6 and the capacitor C10 of the X-bearing electric section 4c is converted into a high frequency constant voltage by the constant voltage conversion circuit composed of the capacitors C11 and C12 and the reactor L7. The converted high frequency constant voltage is rectified by the rectifier circuit 10, smoothed by the smoothing capacitor C 13, converted into DC power, and supplied to the load 5. Since other operations are the same as the operations of the first embodiment of the contactless power supply device and the contactless power supply system according to the present invention described above, description thereof will be omitted.

(Embodiment 4)
FIG. 6 is a block diagram showing a main configuration of the fourth embodiment of the non-contact power supply apparatus and the non-contact power supply system according to the present invention. In this non-contact power supply system, a high-frequency power circuit 1 (AC power supply) causes a high-frequency constant current I1 having a predetermined frequency to flow through, for example, a first-stage power supply line 2 laid in an automatic warehouse. The high-frequency constant current I1 flowing through the first-stage power supply line 2 is received by electromagnetic induction in a non-contact state by the power reception unit 4d (power reception power supply unit). The power receiving unit 4d is attached to the first-stage power supply line 2 so as to be freely movable along the first-stage power supply line 2.

  The power receiving unit 4d receives a power by resonating with a high frequency constant current flowing through the first-stage feeder line 2 in a parallel resonant circuit in which a series circuit of a pickup coil Lp, a capacitor C1, and a reactor L1 and a capacitor C2 are connected in parallel. . The high-frequency constant current received by the power receiving unit 4d is supplied to the second-stage power supply line 3.

Below, operation | movement of the non-contact electric power feeding system of such a structure is demonstrated.
The resonance condition of the power receiving unit 4d is (ωLp + ωL1-1 / ωC1) −1 / ωC2 = 0 (ω is an angular frequency of the input voltage V1 of the power receiving unit 4d).
Because
ω (Lp + L1) − (C1 + C2) / ωC1C2 = 0

The pickup coil Lp shown in FIG. 6 is represented by an L-type equivalent circuit using a transformer, and a high-frequency constant current is supplied to the primary side. Therefore, if the first-stage feeder 2 is omitted, the equivalent circuit shown in FIG. Become.
Here, Lp1 is an excitation inductance of the pickup coil Lp, Lp2 is a leakage inductance of the pickup coil Lp, V1 is applied to both ends of the excitation inductance Lp1, and is supplied to the power receiving unit 4d including Lp1, Lp2, C1, L1, and C2. The input voltage I1 is a high frequency constant current input to the power receiving unit 4d.
V2 is an output voltage of the power receiving unit 4d, and I2 is an output current of the power receiving unit 4d.

here,
ωLp2-1 / ωC1 + ωL1 = ωLp2 ′
Then, the input / output of the power receiving unit 4d is as shown in Equation (4).

From equation (4)
I1 = ((L1 + Lp2 ′) / L1) · I2
Therefore, since the input current I1 of the power receiving unit 4d is an AC constant current, the output current I2 of the power receiving unit 4d is also an AC constant current, and by appropriately selecting the capacitor C1 and the reactor L1, the output constant of the power receiving unit 4d is set. The current can be arbitrarily set.

  In each of the above-described embodiments, the power receiving unit that supplies the AC constant current generated by the power received from the power supply line (2) supplied with the high-frequency constant current to the other power supply line (3) is provided in one stage. However, it goes without saying that it is also possible to employ a configuration in which a plurality of such power reception units are provided.

It is a block diagram which shows the principal part structure of embodiment of the non-contact electric power feeder and non-contact electric power feeding system which concern on this invention. It is a circuit diagram which shows the internal structure and equivalent circuit of the constant current conversion circuit part of the non-contact electric power feeder and non-contact electric power feeding system which are shown in FIG. It is a circuit diagram which shows the equivalent circuit of the constant current conversion circuit part of the non-contact electric power feeding system shown in FIG. It is a block diagram which shows the principal part structure of embodiment of the non-contact electric power feeder and non-contact electric power feeding system which concern on this invention. It is a block diagram which shows the principal part structure of embodiment of the non-contact electric power feeder and non-contact electric power feeding system which concern on this invention. It is a block diagram which shows the principal part structure of embodiment of the non-contact electric power feeder and non-contact electric power feeding system which concern on this invention. It is a circuit diagram which shows the equivalent circuit of the power receiving part of the non-contact electric power feeding system shown in FIG.

Explanation of symbols

1 High frequency power supply circuit (AC power supply)
2 X-axis feed line (first stage feed line)
3 Y-axis feed line (second stage feed line)
4-4c X-bearing power section (power receiving and feeding section)
4d Power receiving unit (power receiving unit)
5,9 Load 6 Constant current conversion circuit part 6a Constant voltage conversion circuit (pickup part)
6b Constant current conversion circuit 7 Constant voltage conversion circuit 8 Y bearing current section 10, 11 Rectifier circuit C1 to C4, C6 to C8, C10 to C12 capacitor C5 Smoothing capacitor (smoothing circuit)
C9, C13 Smoothing capacitor L1-L3, L5, L7 Reactor L4, L6, Lp Pickup coil

Claims (5)

Non-contact power supply comprising one or a plurality of power receiving power supply units that receive power by resonating with the AC constant current in a contactless manner from a power supply line to which an AC constant current is supplied and supply the received power to another power supply line In the device
The power receiving and feeding unit includes a power receiving circuit that receives power by resonating with an AC constant current, and a constant current conversion circuit that converts AC power received by resonance with the power receiving circuit into an AC constant current. A non-contact power feeding apparatus configured to supply an AC constant current converted by a circuit to the other power feeding line.   A constant voltage conversion circuit that converts an AC constant current flowing through the other power supply line into an AC constant voltage, a rectification circuit that rectifies the AC constant voltage converted by the constant voltage conversion circuit, and a smoothing that smoothes the output of the rectification circuit The contactless power feeding device according to claim 1, further comprising a circuit.   The non-contact power feeding device according to claim 1, wherein the power receiving circuit is a series resonance circuit in which a pickup coil and a capacitor are connected in series, and the constant current conversion circuit is an immittance conversion circuit. Non-contact power supply comprising one or a plurality of power receiving power supply units that receive power by resonating with the AC constant current in a contactless manner from a power supply line to which an AC constant current is supplied and supply the received power to another power supply line In the device
The power receiving / feeding unit is a parallel resonant circuit in which a series circuit of a pickup coil, a first capacitor and a reactor, and a second capacitor are connected in parallel, and the parallel resonant circuit receives AC power that has been resonated and received as an AC constant current. It is comprised so that it may convert into and supply to said other electric power feeding line, The non-contact electric power feeder characterized by the above-mentioned.   5. A power receiving power supply unit according to claim 1, comprising a power supply line to which an AC constant current is supplied and receiving power from the power supply line, and another power supply power supply unit that supplies the AC constant current. A non-contact power supply system comprising one or a plurality of power supply lines.

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