JP2012029527A - Non-contact power feeding device and electronic lock system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power feeding device and an electronic lock system for reducing an adverse effect on a radio communication signal in an LF-band without lowering power supply capability to a target equipment.SOLUTION: A non-contact power feeding device 40 includes a power feeding unit 10 provided on a door frame 102 and a power reception unit 20 provided on an opening-closing door 101. The non-contact power feeding device 40 performs a power supply operation on the basis of an authentication result by an authentication device 50 and an authenticator 60, and supplies electric power in a non-contact state to an equipment 30 including an electronic lock of an electronic lock system provided on the opening-closing door 101. The non-contact power feeding device 40 can change an operational state according to an operational state switch command from an electronic lock operation unit 70, for example, when the device 40 is in a stand-by state in which a starting signal is being transmitted from the authentication device 50, the device 40 changes a switching frequency different from that in an active state in which operation power is supplied to the equipment 30 including the electronic lock.

Description

  The present invention relates to a non-contact power supply device that supplies power to a target device in a non-contact manner, and an electric lock system using the same.

  Non-contact power feeding devices that feed power by electromagnetic induction from a power feeding unit to a power receiving unit are used in various devices. For example, application of a non-contact power supply device is being studied in the case where an electric lock device is installed on an opening / closing door in order to introduce a security system to an apartment house or a business establishment. By using a non-contact power feeding device for such an electric lock device, it is possible to reduce the labor of wiring work and to prevent a short circuit or disconnection of the wiring due to repeated opening and closing of the door (for example, see Patent Document 1). ).

JP 2009-55745 A

  In an electric lock system or the like provided with the electric lock device as described above, an authentication device for security authentication is often used. In this type of authentication device, an LF band (long wave band: 30 to 300 kHz) wireless communication signal (activation signal, call signal) is used. On the other hand, the electromagnetic induction type non-contact power supply circuit provided in the non-contact power supply device is a transformer-separated switching power supply circuit, and in order to achieve high efficiency and large power transmission, the switching frequency is about 100 kHz. Is preferred. Here, when the operating frequency (switching frequency) of the non-contact power feeding circuit and the frequency of the LF band wireless communication signal are close to each other, the electromagnetic field radiated from the non-contact power feeding circuit interferes with the LF band wireless communication signal. May have an impact. As a result, the authentication process in the authentication apparatus is hindered, and there is a possibility that problems such as an area where authentication is successful are extremely narrowed or an area where authentication cannot be performed in a spot form occur. Similar problems may also occur in other devices that combine a contactless power supply device and an authentication device.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a non-contact power feeding apparatus capable of reducing adverse effects on LF-band wireless communication signals without reducing the power supply capability to the target device. Is to provide.

  The present invention is a non-contact power feeding device that includes a power feeding unit and a power receiving unit, and performs non-contact power feeding by electromagnetic induction. The power feeding unit has a switching power supply circuit and authenticates using a wireless communication signal in the LF band. A switching power supply circuit in a standby state in which a power supply operation is performed based on an authentication result by an authentication device that performs processing and an LF-band wireless communication signal may be transmitted and an active state in which power is supplied to a device The operation state control part which changes the operation state of this is provided.

  Moreover, this invention is said non-contact electric power feeder, Comprising: As an operation state change, an operation state control part includes what changes the switching frequency of a switching power supply circuit with a standby state and an active state.

  The present invention is the contactless power supply device described above, wherein the operation state control unit sets the first frequency, which is a high frequency in a range not interfering with an LF-band wireless communication signal in a standby state, and the first state in an active state. This includes switching the switching frequency so that the second frequency is lower than the first frequency.

  Further, the present invention is the above non-contact power feeding device, wherein the power receiving unit includes a power receiving side separation transformer having a secondary side coil disposed to face a primary side coil provided in the power feeding unit, and a power receiving side separation. This includes a detection unit that detects a change in switching frequency based on the induced voltage of the transformer, and a device control unit that controls the operation of the device based on the detection result of the detection unit.

  The present invention is the above non-contact power supply device, wherein the power receiving side separation transformer has a search coil separately wound from the secondary side coil, and the detection unit is based on an induced voltage generated in the search coil. Includes those that detect changes in switching frequency.

  In addition, the present invention is the above non-contact power supply apparatus, wherein the operation state control unit intermittently operates the switching operation of the switching power supply circuit in the standby state as a change of the operation state, and transmits an LF band wireless communication signal. In some cases, the switching operation is paused, and in the active state, the intermittent operation of the switching operation is stopped and the oscillation operation is performed for the entire period.

  The present invention is the above non-contact power supply device, wherein the power supply unit has a push-pull type circuit configuration using two switching elements as a switching power supply circuit, and the operation state control unit is an operation state In the standby state, the switching power supply circuit has a one-stone forward operation, and in the active state, the switching power supply circuit has a two-stone push-pull operation.

  Moreover, this invention provides an electric lock system provided with the non-contact electric power feeder in any one of the said, and the electric lock as an apparatus which is connected with a non-contact electric power feeder and receives electric power supply from a non-contact electric power feeder. .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce the bad influence with respect to the radio | wireless communication signal of LF band, without reducing the power supply capability to an object apparatus.

The schematic block diagram which shows the structure of the non-contact electric power feeder which concerns on embodiment of this invention, and an electric lock system The block diagram which shows the structure of the authentication apparatus and authentication subunit | mobile_unit in this embodiment The block diagram which shows the structure by the side of the electric power feeding unit of the non-contact electric power feeder in 1st Embodiment. The block diagram which shows the structure by the side of the power receiving unit of the non-contact electric power feeder in 1st Embodiment. The block diagram which shows the structure of the detection part in the power receiving unit of a non-contact electric power feeder Operation explanatory diagram showing a specific example of switching of the switching frequency in the non-contact power feeding apparatus Characteristic diagram showing an example of the operation when the switching operation is performed at the first frequency f1 in the standby state The block diagram which shows the structure by the side of the power receiving unit of the non-contact electric power feeder in the modification of 1st Embodiment. The block diagram which shows the structure of the detection part in the power receiving unit of the non-contact electric power feeder of a modification. Operation | movement explanatory drawing which shows the operation example of the non-contact electric power feeder in 2nd Embodiment Operation | movement explanatory drawing which shows the operation example of the non-contact electric power feeder in 3rd Embodiment

  In the following embodiments, a configuration example when the non-contact power feeding device according to the present invention is applied to an electric lock system will be described. In such an electric lock system, an electric lock such as an electric thumb turn provided on an opening / closing door is used as a device that supplies power by a non-contact power supply device.

  FIG. 1 is a schematic configuration diagram illustrating a configuration of a contactless power supply device and an electric lock system according to an embodiment of the present invention. The electric lock system of the present embodiment is used for locking or unlocking an opening / closing door 101 such as an entrance door. The open / close door 101 is supported by a door frame 102 through a hinge 103 so as to be freely opened and closed. The electric lock system includes, as main components, a device 30 including an electric lock provided on the open / close door 101 and a non-contact power supply device 40 for supplying power to the device 30 from the door frame 102 side in a non-contact manner. ing. In addition, an authentication device 50 and an authentication slave device 60 that perform authentication processing for driving control of the device 30 and an electric lock operating device 70 as an interface unit that drives and controls the device 30 are provided. The authentication device 50 and the authentication slave device 60 perform authentication processing using an LF-band wireless communication signal. This electric lock system is provided on doors, windows, etc. of various buildings such as buildings, apartment houses, and detached houses.

  The non-contact power feeding device 40 includes a power feeding unit (primary side unit) 10 provided on the door frame 102 and a power receiving unit (secondary side unit) 20 provided on the open / close door 101. The non-contact power feeding device 40 performs a power feeding operation based on the authentication result by the authentication device 50 and the authentication slave device 60. The power supply unit 10 and the power receiving unit 20 are disposed at positions facing each other with the open / close door 101 closed. In the figure, an example in which a non-contact power feeding device 40 is provided on the upper part of the opening / closing door 101 is shown. A power source 80 such as a commercial power source is connected to the power supply unit 10, and a device including an electric lock from the power supply unit 10 through the power reception unit 20 by performing non-contact power supply between the power supply unit 10 and the power reception unit 20. 30 and the authentication device 50 are supplied with operating power (power supply). In addition, an electric lock operator 70 is connected to the power supply unit 10, and the operation state of the non-contact power supply device 40 can be switched by an operation state switching command from the electric lock operator 70.

  The operation state of the contactless power supply device 40 is switched between a standby state in which the authentication device 50 transmits a wireless communication signal in the LF band and an active state in which power is supplied to the device 30. In the standby state, power is supplied from the non-contact power supply device 40 to the authentication device 50 with a small amount of power necessary for circuit operation. In the active state, power is supplied from the non-contact power supply device 40 to the device 30 with a large amount of power necessary for driving an electric lock or the like. The switching of the operation state will be described in detail later, but includes switching of the switching frequency of the switching power supply circuit of the power supply unit 10. From the power receiving unit 20, a control signal of an operation command is output to the authentication device 50 and the device 30 together with the above operating power (power supply). The device 30 is supplied with operating power from the power receiving unit 20, and an electric lock or the like operates according to a control signal.

  The authentication device 50 is provided in the open / close door 101, performs wireless communication with the authentication slave device 60, and performs an authentication process for operating the device 30. The authentication slave unit 60 is configured by an RFID or the like, and is provided for a person or an object to be authenticated. When performing the authentication process, the authentication device 50 transmits an LF band activation signal from the authentication device 50 to the authentication child device 60, and the authentication child device 60 that has received the activation signal transmits an RF band (for example, UHF band) to the authentication device 50. : 300 MHz to 3 GHz) response signal is transmitted. When the authentication is successful and the authentication process is completed, the authentication device 50 transmits an authentication completion signal to the electric lock operating device 70 by wireless communication. When receiving the authentication completion signal, the electric lock operator 70 outputs an operation state switching command to the power supply unit 10 of the non-contact power supply apparatus 40.

  FIG. 2 is a block diagram showing the configuration of the authentication device and the authentication slave unit in the present embodiment. The authentication device 50 includes a control unit 161, a wireless transmission / reception unit 163 that wirelessly communicates with the authentication handset 60 using the first wireless communication method (LF) using the LF antenna 162, and a first operation using the RF antenna 164. And a wireless receiver 165 that receives a response signal from the authenticator 60 by the wireless communication method (UHF) 2 as a main configuration. The control unit 161 includes an activation signal generation unit 175 and an authentication mode setting instruction information reception unit 176, and performs activation signal generation and various operation controls. The authentication mode will be described later.

  In addition, the authentication device 50 includes a display unit 166 that displays the status of the authentication device 50 such as a communication status, and a sound output unit 167 that notifies various information such as authentication completion and errors by sound. Further, a first interface (I / F) unit 168 for transmitting and receiving signals to and from the power receiving unit 20 and a second interface (I / F) unit for transmitting and receiving signals to and from the device 30 169 and a wireless communication unit 171 that wirelessly communicates with the electric lock operating device 70 using the antenna 170.

  The authentication device 50 superimposes the activation signal generated by the control unit 161 on the signal component of the induced magnetic field in the wireless transmission / reception unit (LF band transmission / reception circuit) 163, amplifies the signal, and transmits it from the LF antenna 162 to the first wireless communication method (LF ) To the authenticating slave unit 60 at a constant cycle. As a result, an authentication area is formed around the authentication device 50. Since the LF band can limit the authentication area to several tens of centimeters or less, it is suitable as a means for sending an activation signal.

  The authentication slave device 60 includes a control unit 181, a wireless transmission / reception unit 183 that wirelessly communicates with the authentication device 50 by the first wireless communication method (LF) using the LF antenna 182, and a first operation using the RF antenna 184. A wireless transmission unit 185 that transmits a response signal to the authentication device 50 by the wireless communication method (UHF) 2 is provided as a main configuration. The control unit 181 includes an authentication mode identification unit 195 and a response signal generation unit 196, and generates a response signal and controls various operations. In addition, the authentication slave unit 60 returns a response signal to the authentication device 50, a battery 186 for supplying power to the control unit 181 and the like, a display unit 187 for displaying the status of the authentication slave unit 60 such as a communication status, and the like. And an operation unit 188 for inputting instructions.

  Until the authentication slave unit 60 enters the authentication area of the authentication device 50, each unit other than the wireless transmission / reception unit (LF band transmission / reception circuit) 183 (wireless transmission unit 185, display unit 187, operation unit 188, control unit 181 and the like) Is set to a low power consumption mode in which power is not supplied or hardly supplied from the battery 186. Then, when the authentication slave device 60 carried by the user enters the authentication area of the authentication device 50 and the authentication slave device 60 receives the activation signal from the authentication device 50 by the LF antenna 182 and the wireless transmission / reception unit 183, The wireless transmission / reception unit 183 activates the control unit 181 to shift to a normal mode in which normal power supply to each unit is performed. In addition, the control unit 181 generates a response signal including unique identification information (ID) set in advance using the battery 186 as a power source.

  As the authentication mode of the authentication device 50, for example, three types of authentication modes, that is, an automatic authentication mode, a fraud authentication mode, and a manual authentication mode are provided. In the automatic authentication mode, when the authentication slave device 60 enters the authentication area and receives an activation signal from the authentication device 50, the authentication slave device 60 generates a response signal in the control unit 181 and wirelessly transmits the response signal. A reply is sent from the transmitter (RF band transmitter circuit) 185 to the authentication device 50 via the RF antenna 184 by the second wireless communication method (UHF). This response signal is received by the RF antenna 164 and the wireless receiving unit (RF band receiving circuit) 165 of the authentication device 50 and input to the control unit 161.

  In the tricky authentication mode, when the authentication slave device 60 enters the authentication area and receives an activation signal from the authentication device 50, the authentication slave device 60 generates a response signal in the control unit 181 and wirelessly transmits the response signal. A response is sent from the transmission / reception unit 183 to the authentication device 50 via the LF antenna 182 by the first wireless communication method (LF). At this time, the response signal is transmitted by modulating the carrier wave of the induction magnetic field generated between the LF antennas 162 and 182 of the authentication device 50 and the authentication slave unit 60. This response signal is received by the LF antenna 162 and the wireless transmission / reception unit 163 of the authentication device 50 and input to the control unit 161.

  In the manual authentication mode, after the authentication slave device 60 enters the authentication area and receives the activation signal from the authentication device 50, the authentication slave device 60 performs control when a user operation on the operation unit 188 is performed. The unit 181 generates a response signal, and returns the response signal from the wireless transmission unit 185 to the authentication device 50 via the RF antenna 184 by the second wireless communication method (UHF). This response signal is received by the RF antenna 164 and the wireless reception unit 165 of the authentication device 50 and input to the control unit 161.

  Here, the authentication device 50 generates and transmits an activation signal corresponding to the authentication mode. That is, the control unit 161 of the authentication device 50 receives the authentication mode setting instruction information from a higher-level control device such as the electric lock operating unit 70 in the authentication mode setting instruction information receiving unit 176, and the activation signal generation unit 175 receives this information. An activation signal corresponding to the authentication mode setting instruction information is generated. And the authentication subunit | mobile_unit 60 identifies an authentication mode according to the aspect of the starting signal received from the authentication apparatus 50, and determines the transmission aspect of the response signal according to authentication mode. That is, the control unit 181 of the authentication slave unit 60 identifies the authentication mode based on the received activation signal in the authentication mode identifying unit 195, and generates a response signal corresponding to the authentication mode in the response signal generating unit 196. Then, the data is output to the RF band wireless transmission unit 185 or the LF band wireless transmission / reception unit 183.

  The authentication device 50 periodically transmits an activation signal. In the automatic authentication mode or the tricky authentication mode, when there is an authentication slave device 60 in the authentication area, a response signal is automatically returned from the authentication slave device 60. Then, the authentication device 50 receives this response signal and executes the authentication process. On the other hand, in the manual authentication mode, when the operation unit 188 is operated in the authentication slave device 60 in the authentication area, a response signal is returned from the authentication slave device 60, and this response signal is received by the authentication device 50 for authentication. Execute the process.

(First embodiment)
In the present embodiment, in the electric lock system, when an LF-band wireless communication signal (activation signal, call signal) is transmitted from the authentication device 50 to the authentication slave device 60, it is non-contact with that when the device 30 is operable. The operating state of the power feeding device 40 is changed. As a first embodiment, when the contactless power supply device 40 is in a standby state in which an activation signal is transmitted from the authentication device 50, the contactless power supply device 40 is in an active state in which operating power (power supply) is supplied to the device 30 including the electric lock. Is to change the switching frequency as an operating state.

  FIG. 3 is a block diagram illustrating a configuration on the power supply unit side of the non-contact power supply apparatus according to the first embodiment. The power supply unit 10 of the non-contact power supply apparatus 40 mainly includes a rectifier 121 that rectifies AC power supplied from a power supply 80, a switching power supply circuit 122, and a power supply side separation transformer 123 having a primary side coil and a core. It is prepared as a simple configuration. The power supply unit includes a switching power supply circuit control IC (hereinafter simply referred to as a control IC) 124 that controls the operation of the switching power supply circuit 122, a frequency switching unit 125 that switches the switching frequency of the switching power supply circuit 122, and the control IC 124. And a control unit 126 composed of a microcomputer or the like that controls the operation of the entire 10.

  A smoothing capacitor C <b> 1 is connected between the DC output terminals of the rectifier 121, and the voltage across the smoothing capacitor C <b> 1 is input to the switching power supply circuit 122. The switching power supply circuit 122 performs a switching operation at a predetermined frequency, switches the DC input power to convert it into a pulsed power waveform, and supplies the pulsed power waveform to the power supply side separation transformer 123.

  The control IC 124 is an integrated control circuit that controls the switching operation of the switching power supply circuit 122, and controls the switching operation in accordance with a control signal input from the control unit 126. The control IC 124 is provided with a frequency switching unit 125 including an external resistance element that can be switched, and the state (resistance value constant) of the frequency switching unit 125 is set in a plurality of modes (for example, 2) by a control signal from the control unit 126. Value). By the operation of the frequency switching unit 125, the switching frequency of the switching power supply circuit 122 can be changed to, for example, a first frequency and a second frequency.

  The control unit 126 is provided as an example of a configuration that realizes the function of the operation state control unit. When an operation state switching command is input from the electric lock operator 70, a control signal for switching the switching frequency of the switching power supply circuit 122 is provided. Output to the control IC 124. At this time, the switching frequency is the first frequency when the non-contact power feeding device 40 is in the standby state and the active frequency where the operating power (power source) is supplied from the non-contact power feeding device 40 to the device 30 including the electric lock. Switch to the second frequency. The first frequency is a frequency that does not interfere with the LF band wireless communication signal transmitted from the authentication device 50 (the influence of interference is small), and the second frequency is highly efficient and large for the device 30. This is a frequency with high power supply capability that enables power transmission. For example, the first frequency is higher than the second frequency. Here, when an authentication completion signal is sent from the authentication device 50 to the electric lock operator 70, the electric lock operator 70 outputs an operation state switching command for switching the non-contact power supply device 40 from the standby state to the active state. When the operation of the device 30 is completed, the contactless power supply device 40 recognizes the completion of the operation by a notification signal or an operation state detection, switches the switching frequency of the switching power supply circuit 122, and returns to the standby state. Alternatively, the non-contact power feeding device 40 may switch from the active state to the standby state according to the operation state switching command from the electric lock operator 70.

  The electric lock operator 70 may be provided in one housing together with the power supply unit 10. In this case, the power supply unit has a function of an electric lock operating device.

  FIG. 4 is a block diagram illustrating a configuration on the power receiving unit side of the non-contact power feeding device according to the first embodiment. The power receiving unit 20 of the non-contact power feeding device 40 includes a power receiving side separating transformer 141 having a secondary coil and a core, a rectifying / smoothing circuit 142 for rectifying and smoothing output power of the power receiving side separating transformer 141, The first DC-DC converter 143 is provided as a main configuration. The first DC-DC converter 143 converts the DC power output from the rectifying / smoothing circuit 142 into a predetermined voltage for operating power of the device 30 and outputs the voltage. In addition, the control unit 145 that controls the operation of the power receiving unit 20, the second DC-DC converter 144 that converts the output of the first DC-DC converter 143 into a predetermined voltage for the operation of the control unit 145, and a power supply unit And a detection unit 146 that detects switching of ten operation states.

  When a pulsed power waveform is supplied to the power supply side separation transformer 123 of the power supply unit 10, the power reception side separation transformer 141 of the power reception unit 20 that is opposed by the electromagnetic induction is excited to generate an electromotive force, and the power is transmitted. . The rectifying / smoothing circuit 142 includes a rectifier and a smoothing capacitor connected to the output terminal of the rectifier, and rectifies and smoothes the output power of the power receiving side separation transformer 141. The first DC-DC converter 143 is configured by a switching regulator or the like, and converts the DC power output from the rectifying / smoothing circuit 142 into DC power having a predetermined voltage for driving the device 30 and outputs the converted DC power. The second DC-DC converter 144 converts the DC power output from the first DC-DC converter 143 into DC power having a predetermined voltage for operating the control unit 145 including a microcomputer and the like, and outputs the DC power.

  With the output power from the first DC-DC converter 143, DC power is supplied as a power source to the authentication device 50 and the device 30. Here, when the non-contact power supply device 40 is in a standby state, at least power that allows the authentication device 50 to operate is supplied, and when the non-contact power supply device 40 becomes active, power that can sufficiently drive the device 30 is supplied. The

  The detection unit 146 detects that the switching frequency of the switching power supply circuit 122 of the power supply unit 10 has been switched from the induced voltage of the output of the power receiving side separation transformer 141, thereby detecting the switching of the operation state of the non-contact power supply device 40. .

  FIG. 5 is a block diagram illustrating a configuration of a detection unit in the power receiving unit of the non-contact power feeding apparatus. A rectifying / smoothing circuit 142 including a rectifier 147 and a smoothing capacitor C2 is connected to the power receiving side separation transformer 141 at both ends of the secondary side coil, and a detection unit 146 is connected to one end of the secondary side coil. The detection unit 146 is realized by a Schmitt trigger circuit configured by a comparator or the like, for example. Since the induced voltage in the power receiving side separation transformer 141 is substantially a rectangular wave, the threshold of the Schmitt trigger circuit of the detection unit 146 is appropriately set so that the rectangular wave voltage signal is input from the detection unit 146 to the control unit 145. The control unit 145 can estimate the operating frequency (switching frequency) of the switching power supply circuit 122 of the power supply unit 10 by counting the number of rising or falling induced voltages per unit time based on the rectangular wave voltage signal.

  The control unit 145 is provided as an example of a configuration that realizes the function of the device control unit, determines switching of the operation state of the non-contact power supply device 40 based on the output of the detection unit 146, and the non-contact power supply device 40 is in a standby state. A control signal for an operation command is output when switching from the active state to the active state. This operation command controls the operation of the device 30 and is transmitted to the device 30 via the authentication device 50. When the non-contact power feeding device 40 is in an active state, a large amount of power sufficient to drive the device 30 is supplied, and the electric lock of the device 30 operates according to an operation command from the control unit 145. By providing the detection unit 146 in this way, it is possible to detect a change in the switching frequency on the power reception unit 20 side from the output of the power reception side separation transformer 141, and it is not necessary to separately provide wireless communication means or the like, and the operation state of the contactless power supply device 40 Can be detected. Thereby, it becomes possible to make the apparatus 30 operate | move appropriately according to switching of an operation state.

  Next, switching of the switching frequency in the non-contact power feeding device 40 will be described in detail. When the non-contact power supply device 40 is in a standby state, that is, when an LF-band wireless communication signal (start signal, call signal) is transmitted from the authentication device 50 to the authentication slave device 60, the switching frequency of the power supply unit 10 is set. The first frequency is assumed. And when it is an active state which supplies operating electric power to the apparatus 30, the switching frequency of the electric power feeding unit 10 is switched to a 2nd frequency. Furthermore, when the non-contact power feeding device 40 returns to the standby state, the switching frequency of the power feeding unit 10 is switched to the first frequency again.

  FIG. 6 is an operation explanatory diagram illustrating a specific example of switching of the switching frequency in the non-contact power supply apparatus. Regarding the switching frequency of the power supply unit 10, the first frequency f <b> 1 in the standby state (standby state) is set to a frequency that is far enough not to interfere with the frequency fLF of the LF band activation signal transmitted in the authentication device 50. For example, when the frequency fLF of the start signal in the LF band is about 135 kHz, the power supply unit 10 is switched by setting the first frequency f1 to a higher frequency (for example, about 190 kHz). Thereby, in the non-contact power feeding operation in the standby state of the non-contact power feeding device 40, interference with the LF band wireless communication signal can be reduced, and the influence on the activation signal of the authentication device 50 can be avoided. FIG. 7 is a characteristic diagram illustrating an example of the operation when the switching operation is performed at the first frequency f1 in the standby state, in which the horizontal axis indicates the frequency and the vertical axis indicates the electric field strength. In the figure, the electromagnetic field of the first frequency f1 radiated by the switching operation in the standby state is a dark noise level at the frequency fLF of the start signal in the LF band, and the influence of interference hardly occurs.

  In addition, when the non-contact power feeding circuit is operated at a high frequency as the first frequency f1, the exciting current can be reduced, so that the no-load power during standby that is a loss can be reduced. Therefore, power consumption in the standby state can be reduced and efficiency can be increased. In the standby state, since the authentication device 50 is fed with low power, the influence of the loss is small even if the switching frequency deviates from a region where the power feeding capability is high. Further, since power can always be supplied to the power receiving unit 20 even in the standby state, no power storage element or the like is required in the power receiving unit 20.

  In addition, regarding the switching frequency of the power supply unit 10, the second frequency f2 in the active state (at the time of locking / unlocking) is a region where the power supply capability is close to the peak, and is about 100 kHz that enables high-efficiency and high-power power transmission. . In the active state, power is supplied to the device 30 with high power, so it is desirable to set the switching frequency in a region where the power supply capability is high. As described above, when the device 30 is operated after the authentication is completed, since the activation signal of the LF band is not output from the authentication device 50, the operation power is efficiently increased by operating the power supply unit 10 at the switching frequency having a high power supply capability. Can be supplied to the device 30.

(Modification)
FIG. 8 is a block diagram showing the configuration of the power receiving unit side of the non-contact power feeding device in the modification of the first embodiment, and FIG. 9 is a block diagram showing the configuration of the detection unit in the power receiving unit of the non-contact power feeding device of the modification. FIG. This modification is an example in which a search coil is provided in the power receiving side separation transformer of the power receiving unit. Here, only the configuration of the power receiving unit will be described.

  The power receiving unit 220 of the modified example includes a power receiving side separation transformer 241 having a search coil 242. The search coil 242 is configured to share the secondary side core of the power receiving side separation transformer 241, and is a coil with a different winding from the secondary side coil. A detection unit 246 that detects switching of the operation state of the power supply unit 10 is connected to the output end of the search coil 242. The detection unit 246 detects that the switching frequency of the switching power supply circuit 122 of the power supply unit 10 is switched from the induced voltage of the output of the search coil 242 provided together with the power receiving side separation transformer 241, and thereby the contactless power supply device 40. Detects switching of operating status. The rest of the configuration is the same as that of the first embodiment shown in FIGS. 4 and 5, and a description thereof will be omitted here.

  The detection unit 246 includes a diode 244 and a Schmitt trigger circuit 245. A diode 244 is connected to one end of the search coil 242, and a Schmitt trigger circuit 245 composed of, for example, a comparator is connected via the diode 244. A threshold value of the Schmitt trigger circuit 245 is appropriately set so that a rectangular wave voltage signal is input from the detection unit 246 to the control unit 145. The control unit 145 estimates the operating frequency (switching frequency) of the switching power supply circuit 122 of the power supply unit 10 by counting the number of rising or falling induced voltages per unit time based on the rectangular wave voltage signal, Judgment of switching of operation state.

  Such a search coil 242 for detecting switching of the switching frequency can be realized with a simple configuration by sharing the secondary side core of the power receiving side separation transformer 241. Further, since the number of windings of the search coil 242 can be set freely, it is not necessary to consider the input withstand voltage protection of the Schmitt trigger circuit 245 of the detection unit 246 against the induced voltage that varies depending on the installation environment. Also, the power receiving side separation transformer 241 can freely design the transformer specifications without being influenced by the characteristics of the detection unit 246.

(Second Embodiment)
The second embodiment shows another example in which the operation state is switched between the standby state and the active state in the non-contact power feeding apparatus. In the second embodiment, the mode of on / off control of the switching operation of the power feeding unit 10 is switched as the switching of the operation state in the non-contact power feeding device 40. At this time, when the switching operation (power feeding oscillation) of the power feeding unit 10 is intermittently performed and a wireless communication signal (start signal, call signal) in the LF band is transmitted from the authentication device 50 to the authentication slave unit 60, switching is performed. It is an idle period of operation. The device configuration is the same as in the first embodiment, and the operations of the switching power supply circuit 122 and the control IC 124 of the power supply unit 10 in FIG. 3 are different. In the case of the second embodiment, the frequency switching unit 125 may not be provided.

  FIG. 10 is an operation explanatory diagram illustrating an operation example of the non-contact power feeding device according to the second embodiment. In the second embodiment, as shown in the upper part of the figure, the switching operation (power feeding oscillation) of the power feeding unit 10 is intermittently turned on and off. Then, the LF band wireless communication signal is transmitted from the authentication device 50 during the suspension period of the switching operation. In this case, the period during which the LF band activation signal is output from the authentication device 50 is the idle period, and the primary winding of the power supply side separation transformer 123 due to the power supply oscillation of the power supply unit 10 as shown in the lower part of the figure. No current is generated. For this reason, it is possible to reduce interference with the radio communication signal in the LF band, and to avoid the influence on the activation signal of the authentication device 50.

  In this case, since power is not supplied from the power supply unit 10 to the power receiving unit 20 during the suspension period of the switching operation, the power receiving unit 20 is provided with a storage element such as a capacitor, and the authentication device 50 uses the stored power during the suspension period. To supply power. Therefore, the authentication device 50 transmits the activation signal of the LF band to the authentication slave device 60 using the stored power.

  The switching operation of the power supply unit 10 is switched by switching the operation state of the switching power supply circuit 122 by the control IC 124. At this time, in the standby state of the non-contact power feeding device 40, the above intermittent operation may be performed, and in the active state in which operating power (power supply) is supplied to the device 30 including the electric lock, the intermittent operation may be stopped and the oscillation operation may be performed for the entire period. .

  In the second embodiment, interference with the LF band radio communication signal can be reduced without switching the switching frequency of the power supply unit 10, and the influence on the activation signal of the authentication device 50 can be avoided. In this case, the detection unit that detects the switching of the operation state on the power receiving unit side can determine the operation state based on the presence or absence of the induced voltage, thereby reducing the possibility of erroneous detection.

(Third embodiment)
The third embodiment shows still another example in which the operation state is switched between the standby state and the active state in the non-contact power feeding apparatus. In the third embodiment, the driving method of the switching power supply circuit 122 of the power supply unit 10 is switched as switching of the operation state in the contactless power supply device 40. At this time, the switching power supply circuit 122 of the power supply unit 10 has a two-stone half-bridge push-pull type circuit configuration using two switching elements, and an LF-band wireless communication signal (activation signal) from the authentication device 50 to the authentication slave unit 60. When a call signal is transmitted, a one-stone forward operation is performed by one switching element.

  FIG. 11 is an operation explanatory diagram illustrating an operation example of the non-contact power supply apparatus according to the third embodiment. When the non-contact power feeding device 40 is in a standby state, that is, when an activation signal of the LF band is transmitted from the authentication device 50, only one switching element Q1 is operated as shown in FIG. Forward operation is assumed. In this case, the power supply side separation transformer 123 is supplied with the output power of the switching power supply circuit 122 only to one of the primary side coils connected in series. As described above, in the standby state, the radiation level of the electromagnetic field due to the switching operation of the power supply unit 10 can be lowered, so that interference with the radio communication signal in the LF band can be reduced and the activation signal of the authentication device 50 can be affected. It can be avoided. In this case, since power can always be supplied to the power receiving unit 20 even in the standby state, a power storage element or the like is unnecessary in the power receiving unit 20.

  Further, when the non-contact power feeding device 40 is in the active state, as shown in FIG. 11B, the two switching elements Q1 and Q2 are operated to perform a two-stone push-pull operation. Thereby, in the active state, large electric power necessary for the operation of the device 30 can be supplied.

(Operation of the entire electric lock system)
Next, the operation of the entire system in the above-described electric lock system of the present embodiment will be described. The electric lock system is in a standby state until an instruction is issued from the authentication device 50 and the electric lock operator 70. The standby state may be that the non-contact power feeding device 40 is in any of the following states.

(1) A frequency at which the switching power supply circuit of the power supply unit does not interfere with the LF band wireless communication signal as a switching frequency (in the first embodiment, the first frequency that is distant from the frequency of the start signal in the LF band). It is working.

(2) The switching power supply circuit of the power supply unit performs an intermittent operation that periodically repeats the power supply oscillation and the pause by the switching operation (the second embodiment). The authentication device transmits an activation signal of the LF band by the stored power during the suspension period of the power supply unit.

(3) In the case where the switching power supply circuit of the power supply unit is configured to include a multi-stone switching element, the operation is such that a part of the switching element is stopped (in the third embodiment, the two-stone half bridge / One stone forward operation with push-pull circuit).

  In this standby state, the authentication device 50 transmits an activation signal for the LF band automatically or by human operation according to the authentication mode. When the authentication slave device 60 enters the authentication area of the authentication device 50, the authentication slave device 60 is activated by receiving an activation signal of the LF band, and responds in the RF band or LF band automatically or by human operation according to the authentication mode. A signal is returned to the authentication device 50. At this time, since the electric lock system is in a standby state, the electromagnetic field radiated from the non-contact power feeding device 40 does not interfere with or influence the LF band activation signal.

  Upon receiving the response signal from the authentication slave device 60, the authentication device 50 performs an authentication process and determines whether or not authentication is possible. When the authentication process is completed after successful authentication, an authentication completion signal is transmitted from the authentication device 50 to the electric lock operator 70. In response to the authentication completion signal, an operation state switching command is sent from the electric lock operator 70 to the power supply unit 10 of the non-contact power supply apparatus 40.

  The power supply unit 10 switches the operation state according to the operation state switching command, and transitions to the active state. At this time, for example, switching of the switching power supply circuit, switching to intermittent operation, switching of the driving method of the switching power supply circuit, and the like are performed. In this active state, a non-contact power feeding operation with a high power feeding capability is performed, and a large amount of operating power necessary for the operation of the device 30 can be supplied.

  At this time, the power reception unit 20 detects that the operation state of the power supply unit 10 has been switched by the detection unit. Then, the operating power (power supply) transmitted from the power supply unit 10 is supplied to the device 30, and an operation command control signal for instructing device operation is output to the device 30 via the authentication device 50. As a result, the device 30 including the electric lock operates, and the electric lock is unlocked or locked.

  And if operation | movement of the apparatus 30 is completed, the non-contact electric power feeder 40 will switch operation states, such as switching frequency, and will return to a standby state.

  As described above, in the contactless power supply device according to the present embodiment, power is not supplied to the device, and a standby state in which a wireless communication signal in the LF band may be transmitted from the authentication device and the device On the other hand, the operation state of the switching power supply circuit of the power supply unit is changed in an active state in which driving power is supplied. As a result, when the authentication operation is performed by the authentication device in the standby state, interference with the LF band wireless communication signal can be reduced, and adverse effects on the authentication operation can be suppressed. In the active state, sufficient power can be efficiently supplied to the device. Can supply. Therefore, it is possible to reduce the adverse effect on the LF band wireless communication signal without reducing the power supply capability to the target device.

  In particular, by changing the switching frequency of the switching power supply circuit between the standby state and the active state as a change in the operation state, it is possible to effectively reduce interference with the radio communication signal in the LF band. At this time, the switching frequency is switched so that the first frequency is a high frequency that does not interfere with the radio communication signal in the LF band in the standby state, and the second frequency is lower than the first frequency in the active state. Thus, interference with the LF band radio communication signal in the standby state can be avoided. In addition, since the excitation current can be reduced by setting the first frequency to a high frequency, no-load power that is lost in the standby state can be reduced, and power consumption can be reduced and efficiency can be increased.

  In addition, the power receiving unit includes a detection unit that detects a change in switching frequency based on the induced voltage of the power receiving side separation transformer, and controls the operation of the device based on the detection result of the detection unit. Accordingly, it is possible to detect the change in the operation state of the power supply unit without separately providing a communication unit, and to reliably execute power supply to the device and an operation instruction. Further, the power receiving side separation transformer may be provided with a search coil having a different winding from the secondary side coil, and a change in switching frequency may be detected based on an induced voltage generated in the search coil. Thereby, the detection part of an operation state change is realizable with the simple structure which shared the secondary side coil and the core.

  In addition, as a change of the operation state, the switching power supply circuit is intermittently operated in the standby state, the switching operation is stopped during transmission of the LF band wireless communication signal, and the intermittent operation of the switching operation is stopped in the active state. You may do it. Thereby, it is possible to reduce interference with the radio communication signal in the LF band without switching the switching frequency. In this case, on the power receiving unit side, the change of the operation state can be detected easily and with high accuracy by the presence or absence of the induced voltage.

  Further, the switching power supply circuit may be a push-pull type circuit configuration using two switching elements, and the driving method of the switching power supply circuit may be switched as the operation state is changed. At this time, in the standby state, by setting the switching power supply circuit to the one-stone forward operation, the radiation level of the electromagnetic field due to the switching operation can be lowered, so that interference with the radio communication signal in the LF band can be reduced. In the active state, the switching power supply circuit has a two-stone push-pull operation, so that a large amount of power necessary for the operation of the device can be supplied.

  In addition, by configuring an electric lock system including an electric lock as a device that receives power supply using the above-described contactless power supply device, the LF at the time of authentication processing can be achieved without reducing the power supply capability to the electric lock. Interference with a wireless communication signal in a band can be reduced. Therefore, in the electric lock system, the authentication process can be executed without any trouble, and sufficient electric power can be supplied to the electric lock.

  The present invention is intended to be variously modified and applied by those skilled in the art based on the description in the specification and well-known techniques without departing from the spirit and scope of the present invention. Included in the scope for protection. Moreover, you may combine each component in the said embodiment arbitrarily in the range which does not deviate from the meaning of invention.

  In the above-described embodiment, the configuration example in the case where the non-contact power supply device is applied to the electric lock system has been shown. However, the non-contact power supply device according to the present invention is applied to a device control system using other devices as target devices. It is also possible to do.

DESCRIPTION OF SYMBOLS 10 Power supply unit 20 Power receiving unit 30 Device 40 Non-contact power supply device 50 Authentication device 60 Authentication slave device 70 Electric lock operation device 80 Power supply 101 Opening / closing door 102 Door frame 122 Switching power supply circuit 123 Power supply side separation transformer 124 Switching power supply circuit control IC
125 Frequency switching unit 126 Control unit 141, 241 Receiving side separation transformer 142 Rectifier smoothing circuit 143, 144 DC-DC converter 145 Control unit 146, 246 Detection unit 242 Search coil 245 Schmitt trigger circuit

Claims (8)

A non-contact power feeding device that includes a power feeding unit and a power receiving unit and performs non-contact power feeding by electromagnetic induction,
The power supply unit includes a switching power supply circuit and performs a power supply operation based on an authentication result by an authentication device that performs an authentication process using a wireless communication signal in an LF band.
An operation state control unit configured to change an operation state of the switching power supply circuit between a standby state in which the LF band wireless communication signal may be transmitted and an active state in which power is supplied to the device; Contact power supply device. The contactless power supply device according to claim 1,
The operation state control unit is a non-contact power feeding device that changes a switching frequency of the switching power supply circuit between the standby state and the active state as a change of the operation state. The contactless power supply device according to claim 2,
The operation state control unit is a first frequency that is a high frequency in a range not interfering with the radio communication signal in the LF band in the standby state, and a second frequency lower than the first frequency in the active state. A non-contact power feeding apparatus that switches the switching frequency. The contactless power supply device according to claim 3,
The power receiving unit has a power receiving side separation transformer having a secondary side coil disposed opposite to a primary side coil provided in the power feeding unit, and changes the switching frequency based on an induced voltage of the power receiving side separation transformer. A contactless power supply device comprising: a detection unit that detects; and a device control unit that controls the operation of the device based on a detection result of the detection unit. The contactless power supply device according to claim 4,
The power receiving side separation transformer has a search coil separately wound from the secondary side coil, and the detection unit detects a change in the switching frequency based on an induced voltage generated in the search coil. . The contactless power supply device according to claim 1,
The operation state control unit intermittently operates a switching operation of the switching power supply circuit in the standby state as a change in the operation state, sets a suspension period of the switching operation when transmitting the LF band wireless communication signal, and activates the active state. A non-contact power feeding device that stops the intermittent operation of the switching operation in the state and oscillates for the entire period. The contactless power supply device according to claim 1,
The power supply unit has a push-pull type circuit configuration using two switching elements as the switching power supply circuit,
The operation state control unit is a non-contact power feeding device that changes the operation state so that the switching power supply circuit performs a one-stone forward operation in the standby state, and the switching power supply circuit performs a two-stone push-pull operation in the active state. A non-contact power feeding device according to any one of claims 1 to 7,
An electric lock as a device connected to the non-contact power supply device and receiving power supply from the non-contact power supply device;
An electric lock system.

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