JP2002049428A - Immittance transformer and power unit and non-contact feeder system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an immittance transformer whose input side is made inductive and whose output side is made capacitive capable of suppressing higher harmonies. SOLUTION: A quaternary filter is composed of a first reactor having a first inductance pL, a second reactor having a second inductance L, a first capacitor having a first capacitance C, and a second capacitor having a second capacitance, (1-p)C. In this case, 0<p<1 is established. An impedance viewed from first and second terminals is made proportional to an admittance viewed from third and fourth terminals. Therefore, a constant voltage input is converted into a constant current output, and a constant current input is converted into a constant voltage output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an impedance
The present invention relates to an immittance converter that is an admittance converter, and further relates to a power supply device and a non-contact power supply device using the immittance converter.

[0002]

2. Description of the Related Art An immittance converter is a four-terminal network in which the impedance seen from one pair of terminals is proportional to the admittance seen from the other pair of terminals.

A typical prior art is disclosed in, for example,
305450. This prior art discloses an immittance converter in which a reactor and a capacitor are connected in a T-shape or a π-shape. This prior art has a problem that the order of the filter is low, for example, the third order, and therefore, it is not possible to sufficiently attenuate unwanted harmonics.

Further, in the T-type or π-type prior art, the impedance as viewed from one pair of terminals and the impedance as viewed from another pair of terminals are both inductive or capacitive. Therefore, there is a problem that the use is limited. For example, when a rectangular wave is input from an inverter or the like, it is desirable that one terminal of the immittance converter be inductive.
Thus, the input rectangular wave can be derived from the other pair of terminals as a smooth sine wave. Further, in connecting the output in the prior art to, for example, an electric wire to supply electric power, it is desirable that the output be capacitive, so that in a high frequency band, the output impedance is reduced and the voltage source is easy to use. The prior art has a problem that it cannot be suitably implemented for such an application.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to attenuate and suppress harmonics, make the impedance between one pair of terminals inductive, and make the impedance between the other pair of terminals capacitive. To provide an improved immittance converter.

Another object of the present invention is to provide a power supply device and a non-contact power supply device using the above-described immittance converter.

[0007]

According to the present invention, one end is connected to a pair of first and second terminals, a pair of third and fourth terminals, and a first terminal, and has a first inductance pL. And p is a predetermined coefficient satisfying 0 <p <1;
A first reactor having a predetermined second inductance, a second reactor having one end connected to the other end of the first reactor, the other end connected to the third terminal, and having a second inductance L; The other end of the first reactor;
A first capacitor having one end connected to a connection point with the one end of the second reactor, the other end connected to the second and fourth terminals, and having a predetermined first capacitance C;
A second capacitor having one end connected to the other end of the second reactor and the third terminal, the other end connected to the second and fourth terminals, and having a second capacitance (1-p) C; An immittance converter characterized by including:

According to the present invention, a fourth-order filter is formed by using the first and second reactors and the first and second capacitors, whereby the harmonics of the resonance frequency fr are sufficiently attenuated, and only the resonance frequency fr is reduced. Can be obtained. In addition, when an error occurs in the inductance of the first and second reactors and the capacitance of the first and second capacitors, the coefficient p substantially changes, and even when the resonance frequency fr changes, the output current does not change. And a change in the output voltage can be suppressed, which is particularly favorable when the coefficient p is around 0.5.

Further, according to the present invention, the impedance between one pair of terminals, ie, between the first and second terminals, is inductive by the first reactor, and the impedance between the other pair of terminals, the third and third terminals. The impedance seen from between the fourth terminals is capacitive due to the second capacitor. Therefore, when, for example, a rectangular wave is input between the first and second terminals, an output having a low impedance and a smooth waveform such as a sine wave can be obtained from between the third and fourth terminals. Thus, the present invention uses a semiconductor switching element such as a transistor to provide power, voltage, current,
It can be suitably implemented in the field of so-called power electronics devices that control frequency and the like.

Further, the present invention includes the above immittance converter, and an AC constant voltage source connected to one of between the first and second terminals or between the third and fourth terminals.
A constant-current output is derived from one of the second and third terminals and the other between the third and fourth terminals.

Further, the present invention includes the above immittance converter and an AC constant current source connected to one of the first and second terminals or the third and fourth terminals.
And a power supply device that derives a constant voltage output from either the second terminal or the third terminal or the fourth terminal.

According to the present invention, as will be described later with reference to FIG. 3, between the first and second terminals or between the third and fourth terminals.
An AC constant current source or an AC constant voltage source is connected to any one of the terminals, and a constant voltage output or a constant current output is derived from the other one of the terminals. Thus, the passive element using the reactor and the capacitor is used. By using the immittance converter, a constant voltage source or a constant current can be easily realized.

Further, according to the present invention, each of the plurality of immittance converters is provided with a first and a second immittance converter.
A power supply device characterized in that terminals are connected in series to a power supply line connected to a current source.

Further, according to the present invention, the plurality of immittance converters may be replaced by third and fourth immittance converters.
A power supply device characterized in that terminals are connected in series to a power supply line connected to a current source.

In accordance with the present invention, as described below in connection with FIG. 4, by connecting the input side of a four-terminal network, which is an immittance converter, in series with a feeder line connected to a current source. Even if the load connected to each output side of the plurality of immittance converters is disconnected, power can be supplied to the remaining loads.

According to the present invention, there is also provided an immittance converter, a first AC voltage source connected between one of the first and second terminals or between the third and fourth terminals,
And a second AC voltage source connected to the other terminal between the second terminal and the third and fourth terminals, the second AC voltage source outputting an output having a frequency substantially equal to the frequency of the first AC voltage source. It is a power supply device characterized by the following.

In accordance with the present invention, first and second AC voltage sources are respectively connected between the two pairs of terminals of the immittance converter, as described below in connection with FIG. Each of the first and second AC voltage sources appears to be connected to a constant current source that is proportional to the voltage of the other terminal. As a result, the first and second AC voltage sources can be coupled very stably.

The present invention also provides a DC power supply, an inverter for converting the output of the DC power supply to an AC voltage, and a first and a second power supply.
The immittance converter in which the output of the inverter is applied to one of the terminals or between the third and fourth terminals, and a primary between the first and second terminals or between the third and fourth terminals. A power supply device comprising a transformer to which a winding is connected, and a demodulation circuit for demodulating an output of a secondary winding of the transformer.

Further, the present invention provides a DC power supply, an inverter for converting the output of the DC power supply to an AC voltage, a transformer having a primary winding to which the output of the inverter is provided, and a secondary winding of the transformer comprising: The immittance converter connected between the first and second terminals or between the third and fourth terminals, and any one between the first and second terminals or between the third and fourth terminals of the immittance converter And a demodulation circuit for demodulating the other output.

Further, the present invention provides a DC power supply, an AC power supply,
And a rectifier circuit for converting the output of the AC power supply into a DC.

Further, the present invention is characterized in that the DC power supply is a solar cell. According to the present invention, as described below in connection with FIGS.
The immittance converter 1 is inserted into the high-frequency link 36, for example, and the inverter output PWM (pulse width modulation) at the system frequency is a voltage source, which is converted to a current source by the immittance converter, and the demodulation circuit converts the frequency of the system frequency fL. As a current source, the power is supplied to the system, and the waveform of the current flowing into the system is determined only by the output voltage of the PWM inverter 27, and is independent of the magnitude and waveform of the system voltage. Further, since the inverter side and the system side appear to be constant current sources proportional to each other's voltage, they can be connected very stably. The magnitude of the power flow can be controlled by the PWM modulation rate.

The present invention also provides a conductor arranged along the trajectory of a moving object, an AC constant current source connected to the conductor, a coil electromagnetically coupled to the conductor, and a first and second coil.
A non-contact power supply device comprising: the immittance converter connected to one of terminals or one of a third terminal and a fourth terminal.

The present invention also provides a conductor arranged along the track of the moving object, an AC constant voltage source, and an AC constant voltage source connected between the first and second terminals or between the third and fourth terminals. Connected to one side and the conductor between the first and second terminals or the third
A non-contact power supply device comprising: the immittance converter connected to one of the other terminals between the first terminal and the fourth terminal; and a coil electromagnetically coupled to a conductor.

According to the present invention, as described later with reference to FIGS. 9 to 11, a conductor serving as a feeder line is provided with an immittance converter 63 from an AC constant current source or an AC constant voltage source.
, A constant current is supplied, and a coil attached to a moving body that moves along the conductor is magnetically coupled to the conductor, and the output of the coil is a high-frequency constant current. The constant current output of this coil is converted to a constant voltage by an immittance converter. The constant voltage output of the immittance converter can be rectified, for example, to drive a load as a DC constant voltage source.
Such a DC constant voltage source can be used as a power source for a moving body via an inverter.

[0025]

FIG. 1 is an electric circuit diagram of an embodiment of the present invention. The immittance converter 1 includes a pair of first and second terminals 2 and 3, a pair of third and fourth terminals 4 and 5, a first reactor 6, a second reactor 7, and a first capacitor 8 And a second capacitor 9. The first reactor 6 has one end connected to the first terminal 2 and has a first inductance pL. p is 0 <p
<1 is a predetermined coefficient, and L is a predetermined second coefficient.
Is the inductance of One end of the second reactor 7 is
The other end of the first reactor 6 is connected at a connection point 11.
The other end of second reactor 7 is connected to third terminal 4. Second reactor 7 has second inductance L.

One end of the first capacitor 8 is connected to a connection point 11. The other end of the first capacitor 8 is connected to the second and fourth terminals 3 and 5. This first capacitor 8
It has a predetermined first capacitance C.

One end of the second capacitor 9 is connected to the other end of the second reactor 7 and the third terminal 4. The other end of the second capacitor 9 is connected to the second and fourth terminals 3 and 5. This second capacitor 9 has a second capacitance (1-p) C.

FIG. 2 shows the immittance converter shown in FIG.
1 is an equivalent circuit diagram of FIG. Immittance transformation shown in FIG.
The device 1 includes three circuits Ia, IIa, II shown in FIG.
This is equivalent to a configuration in which Ia is cascaded. 1st and 1st
2 The AC voltage of terminals 2 and 3 is V ₁'And the current is I₁′
The third and fourth terminals 4 and 5 have an impedance Z
_Two′ Are connected, and the third and fourth loads 13
The voltage between terminals 4 and 5 is V_Two'And the current is I_Two'
When using a four-terminal matrix, the following equation 1 is established. Book
In the specification and drawings, over complex variables to represent complex numbers
In addition to the bullets, dashes are added to the variables.
May be added with a number.

[0029]

(Equation 1)

The four-terminal matrix corresponds to each circuit Ia, II in FIG.
a, the product of the four-terminal coefficients for each IIIa, and is expressed by Equation 2.

[0031]

(Equation 2)

[0032] Formula 2 in the characteristic impedance Z ₀ and the resonance angular frequency omega _r is as shown in Equation 3 and Equation 4.

[0033]

[Equation 3]

[0034]

(Equation 4)

In the immittance converter 1, A '= D' = 0
Therefore, Equation 5 is established.

[0036]

(Equation 5)

Thus, the immittance converter shown in FIG. 1 constitutes a fourth-order filter, whereby the harmonics of the resonance frequency fr (= ω _r / 2π) are sufficiently attenuated to obtain an output of only the resonance frequency fr. Can be. In addition, FIG.
According to the experimental results of the present inventor shown in FIG. 2, the coefficient p changes, and even if the resonance frequency fr changes, the first and second terminals 2 and 3 are set to the input side, and the third and the second terminals on the output side are Changes in the output current I ₂ ′ and the output voltage V ₂ ′ of the four terminals 4 and 5 can be suppressed, and particularly, a preferable result is obtained when the coefficient p is about 0.5.

Furthermore, the impedance seen from between the first and second terminals 2 and 3 of the immittance converter 1 is inductive due to the first reactor 6, and is therefore connected to the first and second terminals 2 and 3 by an inverter or the like. When a rectangular wave is input, an output having a low impedance and a smooth waveform such as a sine wave can be obtained from between the third and fourth terminals 4 and 5.

The impedance seen from the terminals 4 and 5 is capacitive due to the second capacitor 9. At high frequencies, the impedance between the third and fourth terminals 4 and 5 is reduced by the action of the second capacitor 9. However, it can be suitably implemented as a voltage source. Third and fourth
A current source may be connected between the terminals 4 and 5, and a voltage may be output between the first and second terminals 2 and 3.

FIG. 3 is a simplified electric circuit diagram of another embodiment of the present invention. An AC constant voltage source 1 is provided between the first and second terminals 2 and 3 of the immittance converter 1 of FIG.
2 is connected, and a constant current output is led to the load 13 between the third and fourth terminals 4 and 5. In FIG. 3, the input impedance of the immittance converter 1 viewed from between the first and second terminals 2 and 3 to which the AC constant voltage source 12 is connected is Z ₀ ² when the impedance of the load 13 is Z ₂ ′. /
Z ₂ ′, and the current I ₂ ′ between the third and fourth terminals 4 and 5 is V ₁ ′ / Z ₀ .

In another embodiment of the present invention, an AC constant current source 12 is connected between the third and fourth terminals 4 and 5, and a constant current is supplied to the load 13 from between the first and second terminals 2 and 3. The output can also be derived.

In another embodiment of the present invention, an AC constant current source is connected between the first and second terminals 2 and 3 instead of the AC constant voltage source 12, and an AC constant current source is connected between the third and fourth terminals 4 and 5. May be used to derive an AC constant voltage output. Alternatively, an AC constant current source may be connected between the third and fourth terminals 4 and 5 to derive an AC constant voltage from between the first and second terminals 2 and 3.

FIG. 4 shows a power supply device according to another embodiment of the present invention.
FIG. 2 is a simplified electric circuit diagram of the device. In this power supply,
A plurality having the same configuration (for example, in this embodiment,
Each immittance converter 1, 1a of 2) is connected to their first
And the second terminals 2 and 3; 2a and 3a;
Is connected via a line 18. Each immittance converter
To the third and fourth terminals 4, 5 of 1, 1a; 4a, 5a
Is connected to loads 16 and 17 in cascade, and is driven by a constant voltage.
Is done. For the immittance converter 1a of the immittance converter 1a
Corresponding parts are indicated by the same numbers with the suffix a. I
The mittens converters 1 and 1a may have the same configuration,
The constants of the constituent elements 6 to 9 are set to the respective immittance converters 1 and 1a.
It may be different every time. These loads 16 and 17
Impedance Z_{twenty one}', Z_{twenty two}'And these loads 1
The current supplied to 6, 17 is I_{twenty one}', I _{twenty two}′ And voltage
To V_{twenty one}', V_{twenty two}′, The immittance converter 1
The voltage between the first and second terminals 2 and 3 is I_{twenty one}'Z
₀₁And the output voltage between the third and fourth terminals 4 and 5 is I
₁'Z₀₁In the immittance converter 1a,
The voltage between the first and second terminals 2a and 3a is I_{twenty two}'Z₀₂
And the output voltage between the third and fourth terminals 4a, 5a is
I₁'Z₀₂It is. Z₀₁, Z₀₂Is the immittance transform
Characteristic impedance of the devices 1 and 1a. Multiple loads 1
Even if one of the loads 16 out of 6 and 17 is disconnected, the remaining
Power can be supplied to the load 17. Figure 4
And the AC constant current source 15, the immittance converter 1, and the immittance
Converter 1a is distributed over a long distance
In such a configuration, the loads 16, 17 are, for example, incandescent lamps.
When the desired current is applied to each of the loads 16 and 17
In the event that one of the loads 16 breaks,
Power can be supplied to the load 17.

In another embodiment of the present invention, the first and second terminals 2 and 3 of the immittance converter 1 and the third and fourth terminals
The terminals 4 and 5 are connected in reverse, and the third and fourth terminals 4 and 5 are connected.
And the load 16 from the first and second terminals 2 and 3, which is the same for the other immittance converter 1a.

FIG. 5 is a simplified electric circuit diagram of another embodiment of the present invention. A first AC voltage source 21 is connected between the first and second terminals 2 and 3 of the immittance converter 1, and a second AC voltage source 22 is connected between the third and fourth terminals 4 and 5. Is done. The first AC voltage source 21 connected to the first and second terminals 2 and 3 is a constant current source of a constant current V ₂ ′ / Z ₀ proportional to the voltage V ₂ ′ of the third and fourth terminals 4 and 5. 23 appears to be connected. A second AC constant voltage source 22 connected between the third and fourth terminals 4 and 5;
It appears that the constant current source 24 having a current V ₁ ′ / Z ₀ proportional to the voltage V ₁ ′ between the first and second terminals 2 and 3 is connected. As a result, the first and second AC voltage sources 21 and 22 can be extremely stably coupled to each other. The first and second AC constant voltage sources 21 and 22 may be, for example, commercial AC power plants and substations, and thus the output voltages V of the first and second AC constant voltage sources 21 and 22 may be used.
₁ ', V _2' when they match the frequency of, the present invention is advantageously carried out. A load may be connected between the first and second terminals 2 and 3, and a load may be similarly connected between the third and fourth terminals 4 and 5.

FIG. 6 is an electric circuit diagram of the power supply device according to one embodiment of the present invention. The power supply device includes a DC power supply 26 such as a solar cell, a system interconnection inverter 27 that converts an output of the DC power supply 26 into an AC voltage,
7, an immittance converter 1 according to the present invention in which an AC output is provided between the first and second terminals 2 and 3, and an output between the third and fourth terminals 4 and 5 of the immittance converter 1 is a primary winding. 28, and the transformer 29
Full-wave rectifier circuit 3 for converting the output of the secondary winding 31 into DC
2, a commercial frequency inverter 33 that converts the DC output of the rectifier circuit 32 to a commercial frequency of a desired frequency, for example, 50 Hz or 60 Hz, and a low-pass filter 34 that converts the DC output of the inverter 33 into a rectangular output sine wave. The output of the low-pass filter 34 is supplied to the system power supply 3 having substantially the same absolute value, phase and frequency of the output voltage of the inverter 33.
5 and is derived.

In this way, the output of the solar cell 26 can be led out to the system power supply 35, and the power obtained by the DC power supply 26 can be sold to the power company of the system power supply 35, for example.
The output of the system power supply 35 is
There is no backflow to the transformer 29 side, and thus to the DC power supply 26 side.

The immittance converter 1 and the transformer 29 are
The high frequency link 36 is configured. The rectifier circuit 32, the commercial frequency inverter 33, and the low-pass filter 34 form a demodulation circuit 37. Inverters 27 and 33 perform PWM (pulse width modulation) on the DC power.

The low-pass filter 34 includes an inverter 33
Sine wave, and functions to remove noise such as unwanted harmonics. Inverter 27
Is the resonance frequency fr of the immittance converter 1
be equivalent to. The output frequency of the inverter 27 is sufficiently higher than the commercial frequency, so that the transformer 29 can be downsized. Inverter 27 has switching elements Q1 to Q4 such as transistors for turning on / off electric power supplied from DC power supply 26, and includes switching elements Q1, Q2.
When Q2 is connected in series, switching elements Q3 and Q4 are connected in series, and when switching elements Q1 and Q4 are simultaneously in one of the ON or OFF switching states, switching elements Q2 and Q3 are either ON or OFF. Or the other switching state. The inverter 33 has switching elements S1 to S4,
It has a configuration similar to that of inverter 27.

FIG. 7 is a simplified diagram showing an equivalent circuit of the power supply device shown in FIG. The current I ₁ ′ flowing between the first and second terminals 2 and 3 of the immittance converter 1 in the high-frequency link 36 is V ₂ ′ / Z ₀ . The current I ₂ ′ derived from the third and fourth terminals 4 and 5 of the immittance converter 1 and the terminals 38 and 39 via the transformer 29 is:
V ₁ ′ / Z ₀ . Therefore, the waveform of the current I ₂ ′ flowing into the system power supply 35 via the demodulation circuit 37 is determined only by the output voltage V ₁ ′ of the system interconnection inverter 27 and is independent of the magnitude and the waveform of the system power supply 35. . Further, the inverter 27 side and the system power supply 25 side have a mutual voltage V
₁ ', V _2' because it looks to the constant current source 41 in proportion to, can be extremely stable interconnection. The magnitude of the power flow can be controlled by the PWM modulation rate of the grid interconnection inverter 27.

FIG. 8 is an electric circuit diagram of a power supply device according to another embodiment of the present invention. The power supply device shown in FIG. 8 is similar to the power supply device shown in FIGS. 6 and 7, and corresponding portions are denoted by the same reference numerals. It should be noted that, in this embodiment, the output of the system interconnection inverter 27 is provided to the primary winding 28 of the transformer 29, and this transformer 29
The output of the secondary winding 31 is the immittance converter 1 of the present invention.
Between the first and second terminals 2, 3. The output between the third and fourth terminals 4 and 5 of the immittance converter 1 is provided to the full-wave rectifier circuit 32 of the extension circuit 37. In the embodiment shown in FIG. 8 as well, excellent effects similar to those of the embodiment shown in FIGS. 6 and 7 described above are achieved.

In the embodiments shown in FIGS. 6 to 8, DC power supply 26 may be a solar cell as described above, but in another embodiment of the present invention, an AC power supply and its AC power supply output are, for example, all outputs. A rectifier circuit that converts the current into a direct current by wave rectification may be used, and the AC power supply may be an AC constant voltage source.

FIG. 9 is a simplified block diagram showing a non-contact power supply device using the immittance converter 1 of the present invention. FIG. 10 is a perspective view showing the pickup coil 51. A conductor 45, which is a power supply line, is provided along the track of the moving body 44, and power is supplied to the conductor 45 from a high-frequency power supply 46, which is a constant current source, via terminals 47 and 48. . The current of the power supply 46 is, for example, 30 A
And the frequency f1 may be, for example, 16 kHz. The conductor 45 is bent and bent in a U-shape at the end of the track, and in the track, a pair of conductors 45 are arranged at intervals.

A pickup coil 51 that is electromagnetically coupled to the moving body 45 is attached to the moving body 44. The pickup coil 51 is configured by winding a coil 53 around a core 52 made of a ferromagnetic material disposed so as to straddle a pair of conductors 45. The core 52 may be, for example, a ferrite core, and the coil 53 may be realized by, for example, a litz wire. The core 52 has recesses 54a and 54b that are opened downward into which the conductor 45 enters, and that are continuous in the traveling direction of the moving body 44 (the horizontal direction in FIGS. 9 and 10).

FIG. 11 is an electric circuit diagram showing the entire configuration of the non-contact power supply device shown in FIGS. The coil 53, together with the capacitor 55 connected in parallel,
First and second terminals 2, 2 of the immittance converter 1 of the present invention.
Given between three. The capacitance of capacitor 55 may be, for example, 1.4 μF. Coil 53 and capacitor 5
5 constitutes a parallel resonance circuit, whereby the frequency of the feeder current supplied to the conductor 45 and the resonance frequency are matched, whereby the exciting reactance of the coil 51 can be made very large. . Outputs of the third and fourth terminals 4 and 5 of the immittance converter 1 are converted to DC and rectified by a rectifier circuit 57 such as a full-wave rectifier circuit realized by a diode or the like, and are rectified via a smoothing capacitor 58 to a terminal. 59 and 60 to the load 61.

In another embodiment of the present invention, the high-frequency power supply 46 is an AC constant-voltage source instead of an AC constant-current source, and is provided between the high-frequency power supply 46 and the terminals 47 and 48 of the conductor 45 in FIG. The immittance converter 1 of the present invention may be interposed at the position indicated by the reference numeral 63. At this time, the immittance converter 1 of the moving body 44 may be mounted as it is, or may be omitted. In the immittance converter interposed at the position of the reference numeral 63 in FIG. 9, one of the terminals between the first and second terminals 2 and 3 or between the third and fourth terminals 4 and 5
The other is connected to the high frequency power supply 46, and the other is connected to the terminals 47 and 48 of the conductor 45.

FIG. 12 is a graph showing the frequency characteristic of the current I ₂ of the immittance converter 1 shown in FIG. FIG.
The horizontal axis of 2 is the ratio (= f / fr) between the frequency f of the voltage applied between the first and second terminals 2 and 3 and the resonance frequency fr.
Is shown. The vertical axis of FIG. 12 represents the current I ₂ (= Z ₀ · I ₂ / V ₁ ) of the third and fourth terminals 4 and 5. The input voltage V ₁ applied between the first and second terminals 2 and 3 is fixed. It can be seen that when the frequency ratio (= f / fr) is approximately 1, the current I ₂ (= Z ₀ · I ₂ / V ₁ ) is kept almost constant. In particular, according to the experiment of the present inventor, the coefficient p is about 0.5.
5, when the frequency f of the power supply between the first and second terminals 2 and 3 deviates from the resonance frequency fr of the immittance converter 1, the current I ₂ between the third and fourth terminals 4 and 5 becomes It was confirmed that it remained almost constant. By choosing the coefficients p to about 0.5 Accordingly, even after changing the constants of the components 6-9 of the immittance converter 1 in accordance with aging, current I ₂ of the load is kept substantially constant, stable characteristics It was confirmed that it could be obtained. The same applies to a configuration in which a power supply is connected to the third and fourth terminals 4 and 5 and an output is derived from the first and second terminals 3.

[0058]

According to the first aspect of the present invention, an undesired higher harmonic is attenuated by forming a fourth-order filter, and the resonance frequency fr is reduced.
Can be obtained. Furthermore, the impedance between one pair of first and second terminals is inductive, so that, for example, when a rectangular wave from the inverter is applied, an output such as a smooth sine wave can be obtained, and the other pair of terminals can be obtained. The impedance seen from between the third and fourth terminals is capacitive, so that the output impedance is low in a high frequency range, and a preferable voltage source can be realized.

According to the second and third aspects of the present invention, an AC constant current source or an AC constant voltage source is realized by using the immittance converter of the present invention. Can be.

According to the present invention, the load connected to the immittance converter can be driven by an AC voltage source or an AC current source, and the load of each of the plurality of immittance converters can be controlled. Even if a disconnection occurs, power can be supplied to the remaining load.

According to the sixth aspect of the present invention, since a voltage source is connected between each pair of terminals of the immittance converter, a constant current proportional to the voltage of one of the voltage sources is output from each voltage source. The sources appear to be connected, so that the two voltage sources can be coupled very stably.

According to the present invention, by inserting the immittance converter into the high-frequency link of the system interconnection inverter, the waveform of the current flowing into the system is determined by the output voltage of the inverter, Of the inverter 27 and the system 35
The side is seen as the constant current sources 41 and 42 proportional to each other's voltage, so that the interconnection can be extremely stably performed. When the DC current is from the solar cell, the demodulation circuit includes a diode or the like, so that supply of power from the system 35 to the solar cell 26 is prevented.

According to the eleventh and twelfth aspects of the present invention, a constant current is supplied to a conductor arranged along a track, and a constant current output obtained from a coil magnetically coupled to the conductor is converted to a constant voltage by an immittance converter. And can be used for load driving.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram of the immittance converter 1 shown in FIG.

FIG. 3 is a simplified electric circuit diagram of another embodiment of the present invention.

FIG. 4 is a simplified electric circuit diagram of a power supply device according to another embodiment of the present invention.

FIG. 5 is a simplified electric circuit diagram of another embodiment of the present invention.

FIG. 6 is an electric circuit diagram of the power supply device according to the embodiment of the present invention.

7 is a simplified diagram showing an equivalent circuit of the power supply device shown in FIG. 6;

FIG. 8 is an electric circuit diagram of a power supply device according to another embodiment of the present invention.

FIG. 9 is a simplified block diagram showing a wireless power supply device according to another embodiment of the present invention.

FIG. 10 is a perspective view showing a pickup coil 51 in the embodiment shown in FIG.

FIG. 11 is an electric circuit diagram showing the entire configuration of the non-contact power supply device shown in FIGS. 9 and 10.

FIG. 12 shows a current I of the immittance converter 1 shown in FIG.
₆ is a graph showing frequency characteristics of FIG.

[Explanation of symbols]

 1, 1a Immittance converter 2 1st terminal 3 2nd terminal 4 3rd terminal 5 4th terminal 6 1st reactor 7 2nd reactor 8 1st capacitor 9 2nd capacitor 26 DC power supply 27 Grid connection inverter 29 Transformer 32 Rectification Circuit 33 Commercial frequency inverter 34 Low pass filter 35 System power supply 36 High frequency link 37 Demodulation circuit 45 Conductor 46 High frequency constant current source 51 Pickup coil 52 Core 53 Coil 57 Rectifier circuit 61 Load

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H03H 7/075 H03H 7/075 Z 7/38 7/38 Z F Term (Reference) 5H007 AA08 BB07 CA01 CB05 CB09 CC06 CC32 EA02 5H410 CC02 DD03 EA16 EA35 EA39 EB09 EB39 EB40 5H420 CC03 DD03 DD08 EA10 EA20 EA45 EB09 EB19 EB39 LL01 5H740 BA11 BA18 BB05 BB08 NN02 5J024 AA01 BA02 BA19 CA06 DA01 DA25 EA09

Claims (12)

[Claims] An end is connected to a pair of first and second terminals, a pair of third and fourth terminals, and a first terminal.
L, where p is a predetermined coefficient that satisfies 0 <p <1, and L is a first inductance that is a second predetermined inductance.
A second end having one end connected to the other end of the first reactor and the other end connected to the third terminal, and having a second inductance L;
One end is connected to a connection point between the reactor and the other end of the first reactor and the one end of the second reactor, and the other end is connected to the second and fourth terminals. A first capacitor having one end connected to the other end of the second reactor and the third terminal, the other end connected to the second and fourth terminals, and a second capacitance (1-p) C And a second capacitor having: 2. An immittance converter according to claim 1, further comprising: an AC constant voltage source connected between one of the first and second terminals or one of the third and fourth terminals. A power supply device, wherein a constant current output is derived from either of two terminals or between the third and fourth terminals. 3. An immittance converter according to claim 1, further comprising: an AC constant current source connected between the first and second terminals or between the third and fourth terminals. A power supply device that derives a constant voltage output from one of the two terminals or the other between the third and fourth terminals. 4. The plurality of immittance converters according to claim 1 are connected in series to a feeder line connected to a current source at first and second terminals of the immittance converters. Power supply. 5. The plurality of immittance converters according to claim 1 are connected in series with a feeder line connected to a current source at third and fourth terminals of the immittance converters. Power supply. 6. The immittance converter according to claim 1, a first AC voltage source connected to one of between the first and second terminals or between the third and fourth terminals, and A second AC voltage source connected between the two terminals or between the third and fourth terminals, the second AC voltage source outputting an output having a frequency equal to the frequency of the first AC voltage source. Power supply. 7. A DC power supply, an inverter for converting an output of the DC power supply to an AC voltage, and an output of the inverter is provided between one of the first and second terminals or between the third and fourth terminals. 1, a transformer having a primary winding connected to one of the first and second terminals or the other between the third and fourth terminals, and an output of a secondary winding of the transformer. A power supply device comprising a demodulation circuit. 8. A DC power supply, an inverter for converting an output of the DC power supply to an AC voltage, a transformer having a primary winding to which the output of the inverter is provided, and a secondary winding of the transformer comprising a first and a second winding. 2. A connection between one of the terminals and one of the third and fourth terminals.
A power supply device, comprising: the immittance converter described above; and a demodulation circuit that demodulates the other output between the first and second terminals or between the third and fourth terminals of the immittance converter. 9. The power supply device according to claim 7, further comprising a DC power supply, an AC power supply, and a rectifier circuit for converting an output of the AC power supply into a DC. 10. The power supply device according to claim 7, wherein the DC power supply is a solar cell. 11. A conductor arranged along the trajectory of a moving object, an AC constant current source connected to the conductor, a coil electromagnetically coupled to the conductor, and a coil between the first and second terminals or 3rd and 4th
A non-contact power supply device comprising: the immittance converter according to claim 1 connected to one of terminals. 12. A conductor arranged along a track of a moving body, an AC constant voltage source, and the AC constant voltage source is connected to any one of between the first and second terminals or between the third and fourth terminals. The immittance converter according to claim 1, wherein the conductor is connected to one of the first and second terminals or the other of the third and fourth terminals, and a coil electromagnetically coupled to the conductor. Non-contact power supply device.