JPH07111758B2 - Telemeter operating power supply system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for supplying electric power for operating an apparatus to be measured in a contactless manner from an apparatus to be measured, particularly in an industrial telemeter.

[Conventional technology and problems]

For example, in a telemeter that measures the torque of the rotating shaft when the rotating shaft is rotating, the measurement data sending side device (measured side device) is mounted on the rotating shaft that is the object to be measured. The data receiving side device (measurement side device) is installed in a fixed place. The device to be measured and the device to be measured are connected to each other in a non-contact manner, for example, by inductive coupling because the object to be measured (rotating shaft) is a moving body and cannot be connected by wire.

In the above telemeter, a battery is generally used to supply the operating power to the device to be measured, but it is necessary to stably supply the power for a long time as in a continuous monitoring system for the device to be measured. If there is, the operating power is also supplied from the measurement side in a non-contact manner. A conventional example of such a system is shown in FIG.

As shown in FIG. 2, in the conventional telemeter system,
The measurement oscillating unit 21 on the measured side and the receiving unit 22 on the measuring side are contactlessly coupled by the transmitting antenna 23 and the receiving antenna 24, and are installed on the measured side to supply operating power to the measured side device. The stabilized power supply unit 25 and the induction power supply unit 26 that is installed on the measurement side and sends out the operating power are a pair of induction coils 2
It is connected contactlessly at 7,28.

The operation of the system shown in FIG. 2 will be described. The measurement data from the sensor 29 is converted into an AC signal (frequency “f ₁ “) that can be transmitted by the measurement oscillating unit 21 and supplied to the transmitting antenna 23, and the receiving antenna 24 It is received by the receiving unit 22 via. On the other hand, the induction power source unit 26 outputs an AC signal for power supply having a frequency “f ₂ ”, which is different from the AC signal for transmitting the measurement data, and this AC signal is generated by inductive coupling between the induction coils 28 and 27. It is transmitted to the stabilized power supply unit 25, where rectification, smoothing, and voltage stabilization are performed, and DC power having a constant voltage is supplied to the measurement oscillation unit 21.

According to the conventional system described above, it is necessary to couple the measured side and the measured side with two pairs of antennas (the transmitting antenna 23, the receiving antenna 24, the induction coils 27, 28), and the measured object, for example, the rotating body. It is necessary to wind two antennas around the shaft, and install a total of two antennas, one for each antenna from the measurement side device, and the measurement side device receives and analyzes the measurement data. Since an induction power source unit is required in addition to the above units, there is a problem that the system becomes expensive.

[Object of the Invention]

The present invention is proposed to solve the above problems, and an object of the present invention is to obtain a telemeter capable of coupling a measurement-side device and a measurement-side device with a pair of antennas.

[Means for solving problems]

For the above-mentioned purpose, the present invention connects the device to be measured and the device to be measured in a non-contact manner with a pair of antennas so that the frequency of the power supply signal to the device to be measured is different from the transmission frequency of the measurement data. The power supply signal is transmitted and received between the pair of antennas together with the measurement data, and more specifically, the measurement side device has a measurement data detection phase-locked loop. , The power supply signal is generated based on the signal before frequency division in the phase-locked loop, thereby making the transmission frequency of the measurement data different from the transmission frequency of the power supply signal, and thereby the measurement side device The device to be measured is connected in a non-contact manner with a pair of antennas.

[Action]

Of the pair of antennas that feed the measured side and the measured side,
A measurement data transmission signal is supplied to the measured side antenna, and a power supply signal is supplied to the measurement side antenna. The pair of antennas are close to each other so as to be coupled to each other by electrostatic coupling, inductive coupling, or both, and a measurement data transmission signal is transmitted from the measured side antenna to the measured side antenna. Signals for power supply are transmitted from the antenna on the measurement side to the antenna on the side to be measured, and the signals for measurement data transmission and the signal for power supply are different in frequency from each other (the signal before frequency division in the phase-locked loop is Since the power supply signal is used, the frequency of the power supply signal is the frequency division ratio (n) of the frequency of the measurement data transmission signal.
Doubled. ), Distinguished from each other.

〔Example〕

 FIG. 1 is a block diagram showing an embodiment of the present invention.

As shown in FIG. 1, the device under measurement generates the sensor 1 provided at the measurement point of the object to be measured, and generates a signal whose oscillation frequency changes, for example, based on the measurement data measured by the sensor 1. A measurement oscillating unit 2 that outputs a signal for transmitting measurement data (hereinafter referred to as a measurement signal) and a hybrid circuit are mainly configured. The measurement signal output from the measurement oscillating unit 2 and the measurement target that is sent from the measurement side. Signal for supplying operating power to the side device (hereinafter referred to as power signal)
And a signal separation unit 3 for separating the measurement signal fed through the signal separation unit 39 to the measurement side and an antenna 4 to which the power signal radiated from the measurement side is incident, and to the antenna 4. A rectifying / smoothing unit 5 that rectifies and smoothes a power signal (which is an AC signal as described later) to obtain DC power.
The rectifying / smoothing unit 5 is configured to have a constant voltage of DC power, and a voltage stabilizing unit 6 for supplying a constant voltage of operating power to each unit of the measured side device such as the measurement oscillation unit 2 and the like, and the measured side. The entire device is mounted on the measured object.

Further, the measurement side device receives the measurement signal radiated from the antenna 4 of the measurement target device, the antenna 7 that radiates the power signal from the measurement side device, and the measurement input to the antenna 7. A low-pass filter 8 that outputs only the signal to the subsequent stage (the above-mentioned measurement signal is incident on the antenna 7 and the above-mentioned power signal is supplied to the antenna 7), the measurement signal input through the low-pass filter 8 and a frequency dividing unit described later. A phase difference detecting unit 10 for detecting a phase difference from the signal output from the signal 9; a low pass filter 11 for converting the phase difference detected by the phase difference detecting unit 10 into a voltage signal of a corresponding level; A voltage controlled oscillator 12 whose oscillation frequency is controlled by a voltage signal to be output, and the voltage controlled oscillator
The frequency of the signal output by 12 is divided into 1 / n and output to the phase difference detection unit 10, and the signal at the previous stage of the frequency division unit 9 (the output signal of the voltage controlled oscillator 12) It is composed of a power amplification unit 13 that amplifies the power signal and feeds the power signal to the antenna 7, an output terminal 14 that extracts the output signal of the low-pass filter 11 as measurement data, and the measurement-side device is at least the same. The antenna 7 is installed at a fixed place so that the antenna 7 faces the antenna 4 of the device to be measured.

Further, a circuit configured by connecting the phase difference detection unit 10, the low-pass filter 11, the voltage controlled oscillator 12 and the frequency divider 9 of the measurement side device to a closed loop is a phase lock loop (hereinafter, referred to as PLL) known per se. That is).

Next, the operation of the telemeter shown in FIG. 1 will be described.

In the measurement side device, the voltage controlled oscillator 12 in the PLL always outputs an AC signal. The frequency of this AC signal changes depending on the frequency "f" of the measurement signal sent from the measured side, and becomes "nf" when the PLL is locked by the frequency operation.

The output signal of the voltage controlled oscillator 12 is input to the power amplifier 13 and amplified, becomes a power signal of frequency "nf", and is supplied to the antenna 7. The antenna 7 is electrostatically or inductively coupled to the antenna 4 of the device under measurement (antenna 7
Since the antenna 4 and the antenna 4 are close to each other at a distance sufficiently shorter than the wavelength of the power signal, the coupling between them becomes electrostatic coupling or inductive coupling. ), A power signal of frequency "nf" is induced in the antenna 4.

In the device to be measured, the power signal induced in the antenna 4 is input to the rectifying / smoothing unit 5 via the signal separating unit 3, converted into DC power, and the voltage stabilizing unit 6 stabilizes the voltage to a set value. As a result, the measured electric power is supplied to each part of the device under measurement that requires operating electric power, such as the measurement oscillation part 2.

On the other hand, the measurement data measured by the sensor 1 is supplied to the antenna 4 as a measurement signal of the frequency “f” based on the measurement data by the measurement oscillating unit 2 which is in operation by being supplied with the operating power by the above operation. As a result, the measurement signal is induced in the antenna 7 of the measurement side device in the same manner as the power signal. The measurement signal induced in the antenna 7 is input to the PLL including the phase difference detection unit 10, the low-pass filter 11, the voltage controlled oscillation unit 12 and the frequency division unit 9 through the low pass filter 8, and the same measurement signal as the above measurement signal is applied to the PLL. The signal of the frequency "f" is reproduced, and the measurement data having the same value as the measurement data measured by the sensor 1 is output to the output terminal 14.

In the above operation, the measurement signal and the power signal are clearly distinguished from each other by the presence of the signal separation unit 3 in the device under measurement and the presence of the low-pass filter 8 in the measurement device.

Further, in the present invention, the rectangular wave signal is used for the measurement signal and the power signal, and the frequency of the power signal is set to an odd multiple of the frequency of the measurement signal (that is, n is set to an odd number). It becomes easy to send and receive signals between
In addition, mixing of external noise is reduced. That is, as is well known, the rectangular wave signal contains odd-numbered harmonic components, and one harmonic component of the measurement signal matches the frequency of the power signal. Therefore, if the tuning characteristics of the antennas 4 and 7 are set so that the received signal levels at the antennas 4 and 7 are above a certain level within a range that covers the range of fluctuation of the measurement signal and the range of fluctuation of the power signal, the above-mentioned range will result. Since the noise of the frequency is eliminated when the signal is transmitted and received between the antennas 4 and 7, the noise becomes stronger by that amount. In the above relationship, the frequency of the measurement signal and the frequency of the power signal are always "1".
Since it has a relationship of "n", it is not broken by the frequency change of the measurement signal, and the frequency relationship between the measurement signal and the power signal is unique because of this relationship.
It will be easier to synchronize.

〔The invention's effect〕

As described above in detail, the present invention couples the measured side and the measured side with a pair of antennas, and outputs the power signal based on the signal before frequency division in the measurement data detecting PLL that the measurement side device has. By generating, the frequency of the measurement signal and the frequency of the power signal are made different, and both signals are transmitted and received between the pair of antennas, and the measured side and the measured side are paired. It is possible to generate a power signal very easily by using only the antenna of, and by using the signal before frequency division in the PLL of the measurement side device.
A system that uses a square wave signal for the measurement signal and the tuning signal, and sets the frequency division ratio of the PLL to an odd number so that the signal transfer efficiency between the measured side and the measured side is high and there is little mixing of external noise. The present invention has the remarkable effect of providing a highly efficient, easy-to-use and inexpensive telemeter.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. (Main symbols) 4, 7 ... Antenna, 5 ... Rectifying / smoothing part 6 ... Voltage stabilizing part, 9 ... Dividing part 12 ... Voltage controlled oscillator part.

Claims (2)

[Claims] 1. A telemeter in which measurement data is transmitted from a measured side to a measured side and electric power for operating a measured side device is measured from the measured side to the measured side in a non-contact manner. The device to be measured has a phase-locked loop for detecting the measurement data from the device on the measurement side, and generates a signal for power supply based on a signal before frequency division in the phase-locked loop to obtain the measurement data. And a transmission frequency of the power supply signal are different from each other so that the measuring side device and the measured side device are connected to each other by a pair of antennas in a non-contact manner. 2. The operating power supply system for a telemeter according to claim 1, wherein a rectangular wave signal is used as a measurement data transmission signal and a power supply signal, and a phase lock of the device under measurement is used. Telemeter operating power supply system with odd loop division ratio.