JP2017070081A - Non-contact sensor identification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate complexity in wiring processing to switch contacts.SOLUTION: A plurality of power reception coils 4A-4C electromagnetically coupled with a power supply coil 3 are positioned opposite to and apart from the power supply coil 3. The power supply coil 3 is connected to a feeder circuit 52, and each power reception coil 4A-4C is connected to power reception output circuits 7A-7C respectively having switch contacts 6A-6C. A calculation circuit 53 is provided for detecting the power supply state of the feeder circuit 52 which changes according to the operation of the switch contacts 6A-6C, to identify each switch contact 6A-6C in operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-contact type sensor specifying device, and more particularly to a sensor specifying device that can specify which one of a plurality of sensors is operating in a non-contact manner.

  As an apparatus for specifying a switch contact as a kind of sensor, for example, a device described in Patent Document 1 is known. The specific device has a configuration in which resistors having different resistance values in a geometric sequence are connected in parallel to each of a plurality of switch contacts, and each pair of switch contacts and resistors is connected in series to a voltage measuring means. Yes. As a result, when one of the switch contacts is activated (opened), the voltage detected by the voltage measuring means decreases in accordance with the resistance value of the resistor connected in parallel with the switch contact. Can be identified.

JP2003-217376

  However, the conventional switch contact identification device requires wiring to each switch contact, and when these switch contacts are provided on a moving body, the wiring process to the switch contact becomes complicated. was there.

  SUMMARY OF THE INVENTION The present invention solves such a problem, and an object of the present invention is to provide a non-contact type sensor specifying device that eliminates the complexity of wiring processing to switch contacts as sensors.

  In order to achieve the above object, in the first invention, a plurality of power receiving coils (4A to 4C) electromagnetically coupled to and separated from the power feeding coil (3) are positioned, and the power feeding coil (3) is fed. The power receiving coils (4A to 4C) are connected to the circuit (52) and are connected to power receiving output circuits (7A to 7C) having sensors (6A to 6C), respectively, to operate the sensors (6A to 6C). There is provided a specifying means (53) for detecting the power supply state of the power supply circuit (52) that changes in response and specifying the sensors (6A to 6C) that are operating.

  In the second aspect of the invention, the sensors (6A to 6C) exhibit different impedances determined in advance during operation, and the specifying means (53) is activated by a change in current supplied to the power feeding circuit (52). The sensor (6A-6C) which is carrying out is specified.

  In the third aspect of the invention, frequency signal generation circuits (8A to 8C) for generating output signals having different predetermined frequencies when the sensors (6A to 6C) are operated, respectively, to the power reception output circuits (7A to 7C). The specifying means (53) is configured to operate the sensors (6A to 6C) in response to a change in frequency appearing in a supply current of the power feeding circuit (52) that changes according to the operation of the sensors (6A to 6C). Is identified.

  The reference numerals in the parentheses refer to the correspondence with specific means described in the embodiments described later.

  As described above, according to the present invention, the power supply coil and the power receiving coil that are electromagnetically coupled are separated from each other, and the power supply state of the power supply circuit associated with the operation of the sensor provided on the power receiving coil side is detected. Since it is possible to identify the sensor that is operating, the complexity of wiring processing to the conventional sensor is eliminated.

It is a block circuit diagram of the non-contact type sensor specific device in a 1st embodiment of the present invention. It is a figure which shows the change of the both-ends potential difference of the resistance provided in the electric power feeding unit. It is a block circuit diagram of the non-contact type sensor specific device in a 2nd embodiment of the present invention. It is a figure which shows the change of the both-ends potential difference of the resistance provided in the electric power feeding unit.

  The embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

(First embodiment)
In FIG. 1, the non-contact type sensor identification device includes a power feeding unit 1 and a plurality of power receiving units 2A to 2C. The power supply unit 1 includes a power supply coil 3, and each of the power reception units 2 </ b> A to 2 </ b> C includes a power reception coil 4. And the feeding coil 3 and each receiving coil 4A-4C are made to oppose at the predetermined distance in which the interaction by electromagnetic induction is possible. The power feeding coil 3 and the power receiving coils 4 </ b> A to 4 </ b> C have better electromagnetic coupling efficiency but may have different shapes.

  The power supply unit 1 includes a power supply circuit 51, a power supply circuit 52, and an arithmetic circuit 53, and a current / voltage conversion resistor 54 is inserted in the middle of a power supply line 55 to the power supply circuit 52. The voltage at both ends of the resistor 54 is input to the arithmetic circuit 53 as a specifying means. The power feeding coil 52 is connected to the power feeding circuit 52, and the power feeding circuit 52 outputs a drive current having a predetermined frequency to the power feeding coil 3. The current supplied from the power supply circuit 51 to the power supply circuit 52 via the power supply line 55 increases as the output current of the power supply circuit 52 increases. The voltage appearing at both ends of the resistor 54 changes in proportion to the current flowing through the feeder line 55. The arithmetic circuit 53 has a built-in CPU, and outputs signals 53a to 53c for specifying the activated switch contacts 6A to 6C from the voltage value appearing at both ends of the resistor 54, as will be described later.

  Each of the power receiving units 2A to 2C includes power receiving output circuits 7A to 7C. The power receiving output circuits 7A to 7C are configured by a power receiving circuit 71 and a rectifier circuit 72 to which the power receiving coils 4A to 4C are connected. The power receiving circuits 7A to 7C are internally provided with capacitors that form LC resonance circuits having a frequency equal to the predetermined frequency with the power receiving coils 4A to 4C so that power can be efficiently received from the power feeding coil 3. The operating power of the power receiving circuits 7A to 7C is supplied from the power receiving coils 4A to 4C. Switch contacts 6A to 6C as sensors are connected to the rectifier circuit 72 via resistors 61A to 61C as impedance applying means. The resistance values of the resistors 61A to 61C are different for each of the power receiving units 2A to 2C. In this embodiment, the resistance value of the resistor 61A is 1, and the resistance values of the resistors 61B and 61C are 1/2 and 1/4, respectively. It has become.

  In the non-contact sensor specifying device having such a configuration, when the switch contact 6A is activated (closed), the resistor 61A is connected to the rectifier circuit 72, and current is supplied from the rectifier circuit 72 to the resistor 61A. The current consumption at this time increases the current consumption of the power receiving output circuit 7A, and this current increase also increases the current consumption of the power feeding circuit 52 of the power feeding unit 1 via the power feeding coil 3 and the power receiving coil 4A that are electromagnetically coupled to each other. . As a result, the current flowing through the feeder line 55 also increases, and the potential difference across the resistor 54 increases. This is shown in the X region of FIG.

  When the switch contact 6B is activated, the resistor 61B is connected to the rectifier circuit 72 and current is supplied from the rectifier circuit 72 to the resistor 61B. However, the resistance value of the resistor 61B is ½ that of the resistor 61A. The supply current increases accordingly. Therefore, the current consumption of the power receiving output circuit 7B also increases, and in the above-described process, the current consumption of the power supply circuit 52 of the power supply unit 1 and the current flowing through the power supply line 55 increase accordingly. Rises. Since the resistance value of the resistor 61B is halved at this time, the potential difference between both ends is almost doubled compared to when the switch contact 6A is activated. This is shown in the Y region of FIG.

  Similarly, when the switch contact 6C is activated, the resistance value of the resistor 61C is 1/4 of that of the resistor 61A. Therefore, the potential difference between both ends of the resistor 54 at this time is larger than that when the switch contact 6A is activated. Almost 4 times. This is shown in the Z region of FIG.

  Further, when the switch contacts 6A and 6B are simultaneously operated, the potential difference between both ends of the resistor 54 is almost three times as compared with the case where only the switch contact 6A is operated, and when the switch contacts 6A and 6C are closed. The potential difference between both ends of the resistor 54 is almost five times that when only the switch contact 6A is activated. When the switch contacts 6B and 6C are activated, only the switch contact 6A is activated. When all the switch contacts 6A to 6C are activated, the potential difference between both ends of the resistor 54 is almost 7 times as compared with the case where only the switch contact 6A is activated.

  Therefore, the arithmetic circuit 53 detects which level the potential difference between both ends of the resistor 54 is, and accordingly, if the switch contact that is operating is 6A, the signal 53a is switched. If the switch contact is 6C, the signal 53b is output. Incidentally, when the switch contacts in operation are 6A and 6B, the signals 53a and 53b are output together.

(Second Embodiment)
In FIG. 3, the power supply unit 1 of the non-contact sensor specifying device is provided with a band-pass filter circuit 56 in addition to the power supply circuit 51, the power supply circuit 52, and the arithmetic circuit 53. The potential difference between both ends of the resistor 54 provided on the power supply line 55 connecting the power supply circuit 51 and the power supply circuit 52 is input to the band pass filter circuit 56. The band-pass filter circuit 56 classifies a pulse signal described later appearing in the potential difference between both ends of the resistor 54 into three types according to the frequency and outputs the pulse signal to the arithmetic circuit 53. The arithmetic circuit 53 outputs signals 53a to 53c for specifying the operated switch contacts 6A to 6C, as will be described later, according to the three types of frequency signals input.

  Each power receiving unit 2A is provided with switching circuits 8A to 8C, which are frequency signal generation circuits, between power receiving output circuits 7A to 7C constituted by a power receiving circuit 71 and a rectifier circuit 72 and switch contacts 6A to 6C which are sensors. Yes. Resistors 81A to 81C are connected between the rectifier circuit 72 of the power receiving output circuits 7A to 7C and the switching circuits 8A to 8C, and switch contacts 6A to 6C are connected to the switching circuits 8A to 8C, respectively.

  In the present embodiment, the resistance values of the resistors 81A to 81C of the power receiving units 2A to 2C are the same. When the switch contacts 6A to 6C connected to the switching circuits 8A to 8C are operated (closed), the switching circuits 8A to 8C are intermittently operated at a predetermined frequency, and the resistors 81A to 81C are respectively operated at a cycle of the frequency. Connect to rectifier circuit 72. And the operating frequency of switching circuit 8A-8C is varied for every power receiving unit 2A-2C. Other configurations are the same as those of the first embodiment.

  In the non-contact type sensor identification device having such a configuration, when the switch contact 6A is actuated (closed), the switching circuit 8A conducts at a predetermined frequency, and the resistor 81A is cycled at the frequency of the rectifier circuit 72. Connect to. Thereby, a current is periodically supplied from the rectifier circuit 72 to the resistor 81A, and the current consumption of the power receiving output circuit 2A periodically changes due to the periodic current change at this time. Due to this periodic current change, the current consumption of the power supply circuit 52 of the power supply unit 1 also changes periodically via the power supply coil 3 and the power reception coil 4A that are electromagnetically coupled to each other, and the current flowing through the power supply line 55 also changes periodically. Thus, the potential difference between both ends of the resistor 54 periodically changes at the predetermined frequency. This is shown in the X region of FIG.

  When the switch contact 6B is activated, the switching circuit 8B is conductively operated at a different frequency (higher frequency in the present embodiment) than the switching circuit 8A, and the current consumption of the power receiving output circuit 2B is periodically changed at a different frequency. In this process, the current consumption of the power supply circuit 52 of the power supply unit 1 and the current flowing through the power supply line 55 are also periodically changed, and the potential difference between both ends of the resistor 54 is periodically changed at different frequencies. This is shown in the Y region of FIG.

  Similarly, when the switch contact 6C is activated, the potential difference between both ends of the resistor 54 periodically changes at a different frequency (higher frequency in this embodiment). This is shown in the Z region of FIG.

  Therefore, in the band pass filter circuit 56, the frequency of the pulse signal appearing in the potential difference between both ends of the resistor 54 is divided into three types depending on which region is output to the arithmetic circuit 53. The arithmetic circuit 53 outputs signals 53a to 53c for specifying the activated switch contacts 6A to 6C depending on which frequency region voltage signals 56a to 56c are input.

  That is, when the voltage signal 56a having the longest change cycle is input, the signal 53a is output assuming that the switch contact 6A is operating, and when the voltage signals 56b and 56c having the shorter change cycle are input. Respectively output the signals 53b and 53c on the assumption that the switch contacts 6B and 6C are operating. In addition, when the plurality of switch contacts 6A to 6C are in operation, the potential difference at both ends of the resistor 54 appears with different change periods, and accordingly, a plurality of voltage signals are output from the band pass filter 56 accordingly. 56a to 56c are input to the arithmetic circuit 53, and a plurality of specific signals 53a to 53c are output from the arithmetic circuit.

  In each of the above embodiments, the sensor is not limited to a switch contact, and any sensor may be used as long as its impedance changes when activated. As described above, the power feeding coil and each power receiving coil need only be spaced apart from each other in an electromagnetically coupled state. For example, a structure in which these coils are wound around a cylinder through which magnetic flux passes can be employed. Or it is good also as a structure which comprises a power feeding coil by the some coil part respectively connected in parallel with a power feeding circuit, and makes a receiving coil each oppose to each coil part. Furthermore, it is good also as a structure which arrange | positions the said several coil part adjacently, arrange | positions in a linear form, and provides each receiving coil on the mobile body which moves along the said coil part.

  DESCRIPTION OF SYMBOLS 1 ... Power feeding unit, 2A, 2B, 2C ... Power receiving unit, 3 ... Power feeding coil, 4A, 4B, 4C ... Power receiving coil, 52 ... Power feeding circuit, 53 ... Arithmetic circuit (specific means), 6A, 6B, 6C ... Switch contact (Sensor), 7A, 7B, 7C... Power reception output circuit, 8A, 8B, 8C... Switching circuit (frequency signal generation circuit).

In the second aspect of the invention, the sensors (6A to 6C) give a predetermined impedance to the power receiving output circuit during operation, and the specifying means (53) supplies the detected power feeding circuit (52). more levels of the supply current, identifies the sensor that is operating (6A-6C).

In the third aspect of the invention, frequency signal generation circuits (8A to 8C) for generating output signals having different predetermined frequencies when the sensors (6A to 6C) are operated, respectively, to the power reception output circuits (7A to 7C). the provided, the specifying unit (53), more frequencies appearing in the current supplied to said detected power supply circuit (52), identifying the sensor is operating (6A-6C).

Each of the power receiving units 2A to 2C includes power receiving output circuits 7A to 7C, and the power receiving output circuits 7A to 7C include a power receiving circuit 71 and a rectifier circuit 72 to which the power receiving coils 4A to 4C are connected. The power receiving circuit 71 includes a capacitor that forms an LC resonance circuit having a frequency equal to the predetermined frequency with each of the power receiving coils 4 </ b> A to 4 </ b> C so that power can be efficiently received from the power feeding coil 3. The operating power of the power receiving circuit 71 is supplied from the power receiving coils 4A to 4C. Switch contacts 6A to 6C as sensors are connected to the rectifier circuit 72 via resistors 61A to 61C as impedance applying means. The resistance values of the resistors 61A to 61C are different for each of the power receiving units 2A to 2C. In this embodiment, the resistance value of the resistor 61A is 1, and the resistance values of the resistors 61B and 61C are 1/2 and 1/4, respectively. It has become.

Claims (3)

A plurality of power receiving coils that are opposed to and separated from the power feeding coil and electromagnetically coupled thereto are positioned, the power feeding coils are connected to the power feeding circuit, and each power receiving coil is connected to a power receiving output circuit including a sensor, A non-contact type sensor specifying device comprising a specifying means for detecting a power supply state of the power supply circuit that changes in accordance with the operation of the sensor and specifying the sensor that is operating. 2. The non-contact type according to claim 1, wherein the sensor indicates different impedances determined in advance, and the specifying unit specifies the sensor that is operating based on a change in a supply current to the power feeding circuit. Sensor identification device. A frequency signal generation circuit that generates an output signal having a predetermined different frequency when each of the sensors is operated is provided for each power reception output circuit, and the specifying unit is configured to change the power supply circuit according to the operation of the sensor. The non-contact type sensor identification device according to claim 1, wherein the sensor that is operating is identified from a change in frequency that appears in a supply current.

Images