JPH10271050A - Secondary circuit device for transmission reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a secondary side circuit device for transmission reception system in which the number of pulse transformers in a reference frequency extract circuit is reduced. SOLUTION: A primary side circuit device 10 transmits a power with an angular frequency ω1 to a power induction coil 21 and a signal with an angular frequency ω2 to a signal induction coil 51 of the secondary side circuit device 200 through contactless mutual induction. The device 200 is provided with a controller section 50 whose one terminal of its operating power supply connects to ground that conducts processing based on the signal with a reference frequency, a signal resonance capacitor 53 whose one terminal connects to ground that is in parallel connection with the signal induction coil 51 so as to cause parallel resonance with a signal angular frequency ω2, a comparator 100 that receives a voltage across the signal resonance capacitor 53, and the angular frequency ω1 obtained from an output of the comparator 100 is used for a reference frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless transmission / reception system used for an IC card or the like.
The present invention relates to a secondary circuit device, and more particularly, to a secondary circuit device used in a wireless transmission / reception system that transmits power and signals in a non-contact manner by using induced electromotive force generated in a coil by a magnetic field.

[0002]

2. Description of the Related Art FIGS. 12 and 13 show a conventional example of a wireless transmission / reception system for transmitting power and signals in a non-contact manner. This wireless transmission / reception system has a primary circuit device 10 and a secondary circuit device 20.
The primary-side circuit device 10 transmits the power of the power angular frequency ω1 and the signal of the signal angular frequency ω2 by the primary-side controller 11, the power amplifier 12, and the primary coil 13,
It is configured to receive a signal of the signal angular frequency ω2. Note that there is a relationship of power angular frequency ω1> signal angular frequency ω2.

[0003] The secondary side circuit device 20 is a power circuit.
A secondary-side power receiving coil (power induction coil) 21, a secondary-side power resonance capacitor 23, a full-wave rectifier circuit 25, a smoothing capacitor 27 connected in parallel to the full-wave rectifier circuit 25, and having one end grounded; It has a secondary load 29 and is configured to receive the power of the power angular frequency ω1.

As a signal circuit, a secondary signal coil (signal induction coil) 51 coupled to the power induction coil 21 by mutual inductance, a signal resonance capacitor 53,
The secondary controller 50 includes a switch 55 for signal transmission and reception, a passive filter including a coil 63 and a capacitor 65, resistors 71 and 75, a capacitor 77, and an operational amplifier 73.
An active filter 70 comprising an integrator according to
7 and a digital modulation / demodulation unit 61 connected via an inverter element 59, and configured to transmit and receive a signal having a signal angular frequency ω2. Note that the digital modulation / demodulation unit 61 includes a receiving unit 61a and a transmitting unit 61b.

A signal transmission / reception changeover switch 55 is switched to a signal receiving contact a in a signal receiving mode, and is switched to a signal transmitting contact b in a signal transmitting mode according to a control signal output from the digital modulation / modulation unit 61. Be replaced. The changeover switch 55 is provided to prevent the influence of the receiving unit 61a during transmission and the influence of the transmitting unit 61b during reception.

[0006] A reference clock as a reference frequency for driving the digital modulation / demodulation unit 61 is a power receiving coil 2.
The power angular frequency ω1 is extracted from both ends of 1 through a pulse transformer 31 as insulating means. The reason for this configuration is that the use of the power angular frequency ω1 as the reference clock eliminates the need for a crystal oscillator.

The operation of the wireless transmission / reception system configured as described above will be described with reference to FIG. The power angular frequency ω1 is transmitted from the primary signal controller 11 to the secondary power receiving coil 21 by the primary coil 13,
The secondary-side power receiving coil 21 and the secondary-side power resonance capacitor 23 resonate in parallel, obtain a smooth DC through the full-wave rectifier circuit 25, and supply power to the secondary-side load 29.

At the same time, the signal angular frequency ω 2 is transmitted from the primary side signal controller 11 to the secondary side signal coil 51 by the primary side coil 13, and the secondary side signal coil 51 and the signal resonance capacitor 53 perform parallel resonance. Since the changeover switch 55 is located on the signal receiving side contact a side, the signal level is attenuated by the passive filter 60, and the signal is input to the digital modulating section 61 via the active filter 70.

On the other hand, the voltage of the power angular frequency ω2 from both ends of the secondary-side power resonance capacitor 23 is
A reference clock is applied to the digital modulation / demodulation unit 61 via the CPU to execute signal processing and the like.

[0010]

As described above, the conventional wireless transmission / reception device has the following problems. First, since the reference frequency of the digital modulation / demodulation unit 61 is extracted from both ends of the secondary-side power resonance capacitor 23 using the pulse transformer 31, the circuit configuration is large and complicated.

Second, since the signal transmission / reception switch 55, which requires high speed, is used for switching between the transmission mode and the reception mode of the digital demodulation unit 61,
This requires a changeover switch 55 with a high operating speed,
In addition, a switch operation unit (not shown) for operating the changeover switch 55 is complicated.

As means for solving the second problem, it is conceivable to directly electrically couple the receiving unit 61a and the transmitting unit 61b of the digital modulation / demodulation unit 61 except for the changeover switch 55. However, since the input impedance Zi of the passive filter 60 tends to be low, the transmitting unit 61b
There is a possibility that the transmission signal from the receiver may be absorbed by the input impedance Zi and transmission may be difficult.

As a countermeasure, the input impedance Z
There is a solution to increase i for high frequencies, but since the inductance of the coil 63 must be high and the capacitance of the capacitor 65 must be low, the coil 63 becomes large or a large number of coils 63 are connected in series. There is a problem that the connection is made.

Third, when the transmission signal (reception signal) is turned off from on as shown in FIG. 13, the electric charge of the signal resonance capacitor 53 and the current of the signal induction coil 51 are reduced by the resistance 51a of the signal induction coil 51. Therefore, a residual voltage is generated at both ends of the signal resonance capacitor 53 for a time Δt, which causes a malfunction. Therefore, the reception signal (transmission signal) is switched from off to on after the elapse of the Δt time. Was. For this reason, quick response was inferior.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the number of pulse transformers in a reference frequency extracting circuit, reduce the number of switches for switching between a transmitting unit and a receiving unit,
Moreover, it is an object of the present invention to provide a secondary circuit device for a transmission / reception system that suppresses a residual voltage generated when switching between transmission and reception.

[0016]

According to a first aspect of the present invention, there is provided a secondary circuit device for a transmission / reception system, which includes a signal induction coupled to a power induction coil and a mutual inductance by a primary circuit device by non-contact mutual induction. Angular frequency ω of electric power with coil
1. In a secondary circuit device for a transmission / reception system that transmits an angular frequency ω2 of a signal, a process is performed based on the signal based on a reference frequency, and a controller having one end of an operation power supply grounded and a signal induction coil in parallel A signal resonance capacitor that is connected and grounded at one end so as to resonate in parallel at the signal angular frequency ω2, a comparator that inputs the voltage across the signal resonance capacitor, and an angular frequency obtained from the output of the comparator ω1 is set as a reference frequency.

A secondary circuit device for a transmission / reception system according to a second aspect of the present invention is a non-contact mutual induction type primary circuit device, in which a power angle is formed between a power induction coil and a signal induction coil coupled to a mutual inductance. In a secondary circuit device for a transmission / reception system that transmits a frequency ω1 and an angular frequency ω2 of a signal, a signal connected in series to a signal induction coil and grounded via a resistor or a coil so as to cause series resonance at the angular frequency ω2 of the signal. And a comparator to which a voltage between both ends of a series circuit of a signal induction coil and a signal resonance capacitor is input, and an angular frequency ω1 obtained by an output of the comparator is used as a reference frequency. It is.

A secondary circuit device for a transmission / reception system according to a third aspect of the present invention includes an extraction coil inserted in series between a parallel resonance circuit including a signal induction coil and a signal resonance capacitor,
The two ends of the signal induction coil are connected to the input of the comparator.

According to a second aspect of the present invention, there is provided a secondary circuit device for a transmission / reception system, comprising: a comparator connected to a single-polarity operation power supply; and a DC blocking capacitor connected to the other end of the signal coil for blocking DC. The other end of the DC blocking capacitor, a comparator that applies approximately half the power supply voltage value to one input terminal via a resistor, and the other input terminal of the comparator has approximately half the power supply voltage value Are connected.

According to a second aspect of the present invention, the other end of the DC blocking capacitor is connected to the input of the first inverter, and the output of the first inverter is connected to the second inverter. Connected to the input of the inverter means, connected to the output of the second inverter means via the first resistor to the input of the first inverter means, the first inverter means being substantially the same as the resistance of the first resistor , The first and second inverters are connected to a single-polarity operating power supply, and a reference frequency is extracted from the output of the second inverter means.

According to a sixth aspect of the present invention, there is provided a secondary circuit device for a transmission / reception system, wherein the primary-side circuit device uses non-contact mutual induction to form a power angle between a power induction coil and a signal induction coil coupled to a mutual inductance. In a secondary circuit device for a transmission / reception system that transmits a frequency ω1 and a signal angular frequency ω2, a signal resonance capacitor that is connected in parallel to a signal induction coil and causes parallel resonance at a signal angular frequency ω2, and receives a signal A controller unit having a receiving unit for transmitting a signal to the primary side circuit device, a voltage clamping unit for cutting at least one of an upper part and a lower part of a voltage generated from the signal resonance capacitor, The input input is connected in parallel with the resonance capacitor and is higher than the impedance at resonance between the signal induction coil and the signal resonance capacitor. A passive filter connected to the output of the active filter, a receiver of the controller connected to the output of the passive filter, and a transmitter of the controller connected to one end of the active filter. It is characterized by having.

A secondary circuit device for a transmission / reception system according to a seventh aspect of the present invention is a non-contact mutual induction primary circuit device, in which a signal induction coil coupled to a power induction coil and a mutual inductance is connected to an angular frequency of power. In a secondary circuit device for a transmission / reception system that transmits ω1 and a signal angular frequency ω2, a signal resonance capacitor that is connected in parallel to a signal induction coil and causes parallel resonance at a signal angular frequency ω2 and receives a signal. A controller section having a receiving section and a transmitting section for transmitting a signal to the primary side circuit device; and a signal resonance section via a resistor when switching between a transmitting mode for transmitting to the transmitting section or a receiving mode for receiving to the receiving section. A short-circuit means for short-circuiting a capacitor is provided.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a circuit diagram showing a wireless transmitting / receiving apparatus according to an embodiment of the present invention. In the drawings, the same reference numerals as those in the related art indicate the same or corresponding parts, and a description thereof will be omitted. FIG.
In the secondary side circuit device 200, a signal resonance capacitor 53 is connected in parallel to a signal induction coil 51 as a signal circuit so as to resonate at an angular frequency ω2 of a signal, and one end thereof is grounded. It suffices that the resonance frequency of the signal resonance capacitor 53 of the signal induction coil 51 is made substantially equal to the angular frequency ω2 of the signal.

The input of the comparator 100 as an operational amplifier for generating a reference frequency is connected to both ends of a signal resonance capacitor 53. That is, the signal resonance capacitor 5
3 and the non-inverting input terminal is grounded.
The output of the comparator 100 is configured to apply the power angular frequency ω1 as a reference frequency to the digital modulation / demodulation unit 61. The comparator 100 has + VD and -V, respectively.
One end of a power supply for operating a central information processing device (CPU) (not shown) in the digital modulation / demodulation unit 61 is grounded.

Next, the operation of the wireless transmitting / receiving apparatus configured as described above will be described with reference to FIGS. From the primary side signal controller 11, the signal angular frequency ω2
Is transmitted from the primary side coil 13 to the secondary side signal coil 51, and the signal induction coil 51 and the signal resonance capacitor 5
And 3 perform parallel resonance operation. However, the secondary side circuit device 20
Since sufficient power is supplied to 0, the intensity of the power wave is generally equal to the intensity of the signal wave, and the power induction coil 21 and the signal induction coil 51 are coupled by mutual inductance. As shown in FIG.
A voltage in which the power angular frequency ω1 is superimposed on the signal angular frequency ω2 is applied to the input of the comparator 100 at both ends of the comparator 10.
A square wave having an angular frequency ω1 is generated at an output of 0, and the square wave having the angular frequency ω1 is applied to a digital modulating / modulating section 61. The digital modulating / modulating section 61 processes a signal based on the reference frequency.

At the same time, the power angular frequency ω1 is transmitted from the primary signal controller 11 to the power induction coil 21 by the primary coil 13 and rectified by parallel resonance between the power induction coil 21 and the secondary power resonance capacitor 23. Smooth DC is obtained by the smoothing capacitor 27 through the circuit 25 to supply power to the secondary load 29.

In the above embodiment, the comparator 10
Although the inversion type is used for 0, it is needless to say that the non-inversion type may be used. In the case of the non-inversion type, the voltage across the signal parallel capacitor 53 is applied to the input of the comparator 100.

Although the signal angular frequency ω2 is obtained by the parallel resonance circuit, the signal angular frequency ω2 may be obtained by the series resonance circuit as shown in FIG. That is, the series resonance capacitor 153 is connected to the signal induction coil 51, and the series resonance capacitor 153 is grounded via the resistor 102 or a coil (not shown).
3 may be connected to the input of the comparator 100. With this configuration, the impedance seen from the secondary-side controller 50 becomes the resistance value of the resistor 102, so that it is possible to easily cope with low impedance.

Embodiment 2 Another embodiment of the present invention will be described with reference to FIG. In FIG. 4, the angular frequency ω
1 is inserted between the signal induction coil 51 and the signal resonance capacitor 53, and the comparator 100 has an input connected to both ends of the signal induction coil 51 and an output connected to the secondary side. It is configured to be applied to the controller 50.

The operation of the secondary circuit device for a transmission / reception system configured as described above will be described with reference to FIGS. Now, the signal angular frequency ω2 is transmitted from the primary signal controller 11 to the secondary signal coil 51 by the primary coil 13.
To the signal induction coil 51 and the extraction coil 111
And the resonance angular frequency ω
2, the component of the resonance angular frequency ω2 is high at the voltage V1 across the signal resonance capacitor 53, and the voltage of the power angular frequency ω1 is high at the voltage V2 across the signal induction coil 51. , And the voltage of the reference clock having the angular frequency ω1 is input to the output of the comparator 100 to the secondary-side controller.

The reason why the component of the resonance angular frequency ω2 is high at the voltage V1 across the signal resonance capacitor 53 and the voltage of the power angular frequency ω1 is high at the voltage V2 across the signal induction coil 51 will be described below. I do. Signal induction coil 51, extraction coil 111, signal resonance capacitor 5
The equivalent circuit of No. 3 is shown in FIG. From this equivalent circuit, the voltage V1 across the capacitor 53 and the voltage V2 of the signal induction coil 51 are given by the following equation. L2 represents the inductance of the signal induction coil 51, L3 represents the inductance of the extraction coil 111, C2 represents the capacitance of the signal resonance capacitor 53, and E represents the induced electromotive force from the primary coil 13 as a voltage source. .

V1 = E / {1−ω ² C2 (L2 + L3)} (1) V2 = {(1−ω ² L3C2) E} / A (2) where A = 1−ω ² C2 (L2 + L3), and
The gains G1 and G2 for the induced electromotive force E are given by the following equations.

G1 = V1 / E (3) G2 = V2 / E (4) The frequency at which the gains G1 and G2 are maximized is ω ² C2.
From (L2 + L3) = 1, the following expression is obtained.

[0034] ω2 = 1 / {C2 (L2 + L3)} 1/2 ··· (5) Further, the frequency at which the gain G2 is minimized ω ² L3C2 =
It becomes the following formula from 1.

Ω3 = 1 / (L3L2) ^1/2 (6)

From the above equation, the gains G1 and G2 and the angular frequency ω
Is as shown in FIG. 5B. According to the Bode diagram, at the power angular frequency ω1, the gain G2 is considerably larger than the gain G1. Signal angular frequency ω
At 2, the gain G2 is substantially equal to the gain G1.
That is, at the power angular frequency ω1, the capacitor 5
3, the voltage V of the signal induction coil 51
2 is much higher, and by inputting the voltage V2 between both ends to the comparator 100, the power angular frequency ω1 can be more easily extracted as a reference frequency, and is less affected by noise or the like.

Embodiment 3 Another embodiment of the present invention will be described with reference to FIG. In the embodiment of the present invention, the power supply of the comparator 100 is +
VD and -VD required two types of polarities and voltage values,
As shown in FIGS. 6 and 7, the power supply has a single polarity. In FIG. 6, a DC cut-off capacitor 125 connected to the signal induction coil 51 and the signal resonance capacitor 53 for cutting off a DC component is provided, and the comparator 100 is connected to the non-inverting input terminal via a resistor 121. The power supply + 1 / 2VD is connected to one end of the DC blocking capacitor 125, and the power supply + 1 / 2VD is applied to the inverting input terminal.

The reason why the DC blocking capacitor 125 is provided is that when the comparator 100 is a single-polarity power supply, the non-inverting input terminal of the comparator 100 is biased to +1/2 V DC of the power supply and the inverting input terminal is used. DC + 1 / 2VD of the power supply
Input the signal biased by. However, since the voltage between both ends of the signal induction coil 51 changes positively and negatively around the ground, the DC component is removed by the DC blocking capacitor 125.

7, the same reference numerals as those in FIG. 6 denote the same parts, and a description thereof will be omitted. Resistors 131 and 133 having substantially the same resistance value are connected between the power supply and ground, and
1, 133 are connected to the inverting input terminal of the comparator 100, and the power supply + VD / 2 is connected to the non-inverting input terminal. As a result, the inverting input terminal of the comparator 100 is connected to +
It can be biased to VD / 2.

FIG. 8 shows an example in which the power supply only needs to have a single polarity + VD. 8, the same reference numerals as those in FIG. 7 denote the same or corresponding parts, and a description thereof will be omitted. One end of the DC blocking capacitor 125 is connected to the input of the inverter element 141,
Grounded via the second resistor 147, the inverter element 1
The output of 41 is connected to the secondary-side controller 50 via the inverter element 143 and to the input of the inverter element 141 via the feedback resistor 145 as the first resistor. The resistance values of the resistor 147 and the feedback resistor 145 are almost the same, and the input of the inverter element 141 is biased to １ ／ of the power supply. According to this embodiment, high-speed response can be improved as compared with the comparator 100 using an operational amplifier.

It should be noted that the bias was applied so as to be の of the power supply voltage value, because the signal voltage for the AC is most suitable for just distribution around the bias voltage. Therefore, in practice, 1/3 or 1/4 of the power supply voltage value is acceptable.

Embodiment 4 Another embodiment of the present invention will be described with reference to FIG. 9, the same reference numerals as those in the first embodiment denote the same or corresponding parts, and a description thereof will be omitted. The secondary circuit device 400 is connected to a power supply + VD via a diode 204 as a voltage clamp from a connection point between the signal resonance capacitor 53 and the signal induction coil 51, and similarly, a diode 2 as a voltage clamp.
The passive filter composed of the coil 209 and the capacitor 211 via the active filter 70 and both ends of the signal resonance capacitor 53 eliminate residual vibration at the connection point. The collector of the transistor 201 as a short-circuit means is connected to the inverter element 59 via the resistor 57 via a vibration damping resistor 203 for connection. Note that the output of the inverter element 59 is connected to the input of the digital modulation / demodulation unit 61, and the emitter of the transistor 201 is grounded.

Here, the characteristic point is that, in order to prevent the transmission signal from being absorbed by the active filter 70, the impedance of the active filter is higher than the impedance ZC of the resonance circuit including the signal induction coil 51 and the signal resonance capacitor 53. By increasing the input impedance ZA of 70,
The transmission filter is configured to be able to transmit without being absorbed by the active filter 70.

That is, the impedance ZC of the parallel resonance circuit is as follows, where L2 is the inductance of the signal induction coil 51, R2 is the series resistance, C2 is the capacitance of the signal resonance capacitor 53, and ω is the angular frequency.

| ZC | = (R2 ² + ω ² L2 ² ) ^1/2 / B (7) where B = {(1−ω ² L2C2) ² + ω ² C2 ² R2 ² }
^1/2 , and since the signal induction coil L2 and the signal resonance capacitor C2 are in a parallel resonance state,

| ZC | max = R2 + {L2 / (R2C2)} (8) where ω = 1 / (L2C2) ^1/2 . Now
Since L2≫R2C2, | ZC | max is on the order of several KΩ. For example, with an antenna coil having a diameter of 50 mm and 10 turns, L = 10 μH, R = 0.1Ω, and C =
When 2500 pF and fc = 1 MHZ, | ZC | max = 4
It becomes 0 kΩ.

Since the input impedance ZA of the active filter 70 is determined by the input resistance 71 (see FIG. 1), the input impedance ZA becomes a very high value, and the input impedance ZA of the active filter 70> the input impedance Z of the resonance circuit.
C. Therefore, the transmission signal of the transmission unit 61b of the digital modulation / demodulation unit 61 is configured to be directed to the signal induction coil 51 without being absorbed by the input impedance ZA of the active filter 70.

The operation of the wireless transmission / reception device configured as described above will be described with reference to FIG. First, the signal angular frequency ω2 is transmitted from the primary signal controller 11 to the secondary signal coil 51 by the primary coil 13, and the secondary signal coil 51 and the signal resonance capacitor 53 perform parallel resonance operation, The received voltage is the clamp diode 2
As shown in FIG. 10, both ends of the signal voltage are almost completely removed by passing through the active filter 70. The signal is input to the digital modulation / demodulation unit 61 via a filter.

When a transmission signal is generated from the digital modulation / demodulation unit 61 via the inverter element 59 and the resistor 57,
Since the input impedance ZA of the active filter 70> the input impedance ZC of the resonance circuit, the transmission signal is transmitted to the signal induction coil 51 without being absorbed by the active filter 70.

The operation when the transmission signal is turned off from on and the reception signal is turned on from off will be described with reference to FIGS. 9 and 11. Now, the digital modem 61
The transmission signal from the transmission unit 61b is turned off from on,
At this timing, the transistor 201 is turned on from off, and the charge of the signal resonance capacitor 53 and the current of the signal induction coil 51 are attenuated through the resistor 203, and the voltage VC across the signal resonance capacitor 53 becomes longer after the time Δts has elapsed. Decays quickly.

Since it is not necessary to cut off the voltage depending on the voltage value of the voltage across the signal resonance capacitor 53, either one of the diodes 204 and 205 may be used.

[0052]

As described above, according to the first aspect, there is an effect that the reference frequency can be given to the controller with a simple configuration without using a crystal oscillator, a pulse transformer, or the like.

According to the second aspect of the invention, the reference frequency can be given to the controller with a simple configuration without using a crystal oscillator, a pulse transformer, and the like, and the impedance seen from the controller can be easily adjusted. There is an effect that it can be lowered.

According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, since the extraction of the signal of the reference frequency for operating the controller can be easily performed, there is an effect that it is hardly affected by noise or the like.

According to the fourth aspect, in addition to the effects of any one of the first to third aspects, since only the positive or negative power source is required, the power source circuit can be simplified.

According to the fifth aspect, in addition to the effects of any one of the first to third aspects, the power supply circuit can be simplified because only the positive or negative power supply and a single voltage value are required. effective.

According to the sixth aspect, when switching between the signal transmission mode and the reception mode, the transmission / reception changeover switch is not used, so that the number of the changeover switches can be reduced, the signal can be transmitted efficiently, and the high speed signal can be transmitted. There is an effect that response is possible.

According to the seventh aspect, the signal resonance capacitor is short-circuited by the short-circuit means via the resistor at the time of switching between transmission and reception of the signal. Therefore, the residual vibration generated from the signal resonance capacitor can be suppressed quickly, and the speed can be increased. There is an effect that signal transmission and reception can be switched.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a wireless transmitting / receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a curve diagram showing input / output waveforms of the comparator of FIG.

FIG. 3 is a circuit diagram of a wireless transmission / reception device showing another embodiment of the present invention.

FIG. 4 is a circuit diagram of a wireless transmission / reception device showing another embodiment of the present invention.

FIG. 5 is an equivalent circuit diagram and a boat diagram of FIG. 4;

6 is a circuit diagram in which the power supply of the comparator in FIG. 1 has a single polarity.

FIG. 7 is a circuit diagram in which the power supply of the comparator in FIG. 1 has a single polarity.

FIG. 8 is a circuit diagram in which the comparator of FIG. 1 is configured by an inverter element.

FIG. 9 is a circuit diagram showing a wireless transmitting / receiving apparatus according to another embodiment of the present invention.

FIG. 10 is a curve diagram showing a voltage waveform at both ends of the signal resonance capacitor of FIG. 8;

11 is a curve diagram showing voltage waveforms at both ends of a signal resonance capacitor when switching between transmission and reception in FIG. 8;

FIG. 12 is a circuit diagram showing a conventional wireless transmission / reception device.

13 is a circuit diagram of switching between transmission and reception in FIG. 12 and a curve diagram showing voltage waveforms at both ends of a signal resonance capacitor.

[Explanation of symbols]

10 Primary circuit device, 11 Primary controller,
Reference Signs List 12 power amplifier, 13 primary coil, 21 power induction coil, 23 secondary power resonance capacitor, 50 controller, 51 signal induction coil, 53 signal resonance capacitor, 70 active filter, 100 comparator,
102 resistance, 111 extraction coil, 125 DC blocking capacitor, 141 first inverter means, 143
Second inverter means, 145 first resistor, 147
2nd resistor, 200 secondary side circuit device, 201 short circuit means (transistor), 203 resistor, 204, 205
Clamping means.

Claims (7)

[Claims] 1. A transmission / reception system in which an angular frequency ω1 of power and an angular frequency ω2 of a signal are transmitted to a power induction coil and a signal induction coil coupled to a mutual inductance by a non-contact mutual induction primary circuit device. A secondary side circuit device for performing processing based on the signal based on a reference frequency, a controller section having one end of an operating power supply grounded, and a parallel connection to the signal induction coil, and an angular frequency ω2 of the signal. A signal resonance capacitor having one end grounded so as to cause parallel resonance, a comparator for inputting a voltage between both ends of the signal resonance capacitor, and the angular frequency ω1 obtained from the output of the comparator as the reference frequency. A secondary-side circuit device for a transmission / reception system, characterized in that: 2. A transmission / reception system in which an angular frequency ω1 of power and an angular frequency ω2 of a signal are transmitted to a power induction coil and a signal induction coil coupled to a mutual inductance by a non-contact mutual induction primary circuit device. And a signal resonance capacitor connected in series with the signal induction coil and grounded via a resistor or a coil so as to resonate in series with the angular frequency ω2 of the signal. A secondary circuit device for a transmission / reception system, wherein a comparator to which a voltage between both ends of a series circuit with a resonance capacitor is input, and the angular frequency ω1 obtained by an output of the comparator is used as the reference frequency. 3. A signal resonance capacitor connected in parallel to the signal induction coil according to claim 1 and having one end grounded so as to resonate in parallel at an angular frequency ω2 of the signal, and a voltage across the signal resonance capacitor. Instead of a comparator to input a signal, an extraction coil was inserted in series between a parallel resonance circuit including the signal induction coil and the signal resonance capacitor, and both ends of the signal induction coil were connected to the input of the comparator. A secondary circuit device for a transmission / reception system, characterized in that: 4. A comparator connected to a single-polarity operation power supply, a DC blocking capacitor connected to the other end of the signal coil for blocking DC, and another end of the DC blocking capacitor. The comparator wherein substantially half of the power supply voltage value is applied to one input terminal via a resistor, and the other input terminal of the comparator is connected with substantially half the power supply voltage value. The secondary circuit device for a transmission / reception system according to any one of claims 1 to 3. 5. The DC power supply according to claim 4, wherein the comparator is connected to an operating power supply having a single polarity, a DC cutoff capacitor connected to the other end of the signal coil for cutting off direct current, and a DC cutoff capacitor. The other end, the comparator in which approximately half of the power supply voltage value is applied to one input terminal via a resistor, and instead of the other input terminal of the comparator being connected with approximately half the power supply voltage value, The other end of the DC blocking capacitor is connected to the input of the first inverter, the output of the first inverter is connected to the input of the second inverter, and the output of the second inverter is connected to the input of the second inverter. A first resistor connected to an input of the first inverter means, the first inverter means being grounded via a second resistor having substantially the same resistance value as the first resistor, and Single 2 inverters Connected to sexual operating power, said second inverter means secondary circuit device for transmission and reception system according to extract the reference frequency from the output from claim 1, wherein the either of claims 3. 6. A transmission / reception system in which an angular frequency ω1 of power and an angular frequency ω2 of a signal are transmitted to a power induction coil and a signal induction coil coupled to a mutual inductance by a non-contact mutual induction primary circuit device. In the secondary circuit device for use, a signal resonance capacitor connected in parallel to the signal induction coil and causing parallel resonance at the angular frequency ω2 of the signal, a receiving unit for receiving the signal, and the primary circuit device A controller unit having a transmission unit for transmitting a signal to the signal resonance capacitor; a voltage clamp unit for cutting at least one of an upper part and a lower part of a voltage generated from the signal resonance capacitor; and a controller connected in parallel to the signal resonance capacitor. ,
An active filter having an input impedance higher than the impedance at the time of resonance between the signal induction coil and the signal resonance capacitor; a passive filter connected to an output of the active filter;
A secondary circuit device for a transmission / reception system, comprising: a reception unit of the controller unit connected to an output of the passive filter; and a transmission unit of the controller unit connected to one end of the active filter. 7. A transmission / reception system in which an angular frequency ω1 of power and an angular frequency ω2 of a signal are transmitted to a signal induction coil coupled to a power induction coil and a mutual inductance by a non-contact mutual induction primary circuit device. In the secondary circuit device, a signal resonance capacitor connected in parallel to the signal induction coil and causing parallel resonance at the angular frequency ω2 of the signal, a receiving unit for receiving the signal, A controller unit having a transmission unit for transmitting a signal; and a short-circuit unit for short-circuiting the signal resonance capacitor via a resistor when switching between a transmission mode for transmitting to the transmission unit or a reception mode for receiving to the reception unit. A secondary circuit device for a transmission / reception system, comprising: