JP2006287999A - Feeder system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feeder system capable of effectively protect other circuits or the like in the feeder system from a kick-back voltage in the feeder system supplying power by a non-contact electromagnetic induction method. <P>SOLUTION: The feeder system SP equipped with a power supply coil 1 supplying power relative to a power receiving coil by a non-contact electromagnetic induction action and a power supply section 2 applying power relative to the power supply coil 1, includes a comparator 6 detecting the kick-back voltage occurred in the power supply coil 1, a power supply stop section 7 stopping the supply of power relative to the power supply coil 1 based on the detected kick-back voltage, an integrated circuit IC4 confirming whether the kick-back voltage occurs again or not after power supply is stopped, and an integrated circuit IC5 resuming the supply of power relative to the power supply coil 1 when it is confirmed that the kick-back voltage does not occur again. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of a power feeding device, and more specifically to the technical field of a power feeding device that supplies power to a power receiving unit by non-contact electromagnetic induction.

  In recent years, research and development on various display devices have been actively performed. As one of them, an organic EL (Electro Luminescence) display device has been developed to a practical stage. This organic EL display device has features such as high brightness, high definition, high-speed response, and a high viewing angle, and is expected as a next-generation display device.

  In addition, the organic EL display device has a feature that it can be configured as a display device that is thin and bendable like paper because of its structure. By constructing the posting itself with an organic EL display device, it is also possible to realize the posting in which the visual effect as the posting is greatly improved by light emission.

  Here, when the posting is constituted by the organic EL display device as described above, it is naturally necessary to supply electric power for driving the organic EL display device as the posting at the time of the posting. . And, considering that it is necessary to be able to attach to and detach from the posting place such as a wall as a characteristic of the posting thing, it is considered that the power supply by the conventional method is the above posting place and the posting thing. A configuration is conceivable in which an electrical contact is provided and electric power is supplied to the posting from an electric power supply source provided at the posting location.

  However, in the case of power supply through such an electrical contact, the electrical contact degree is reduced by repeating the attachment and detachment many times (that is, the resistance value at the contact increases), thereby supplying power. Has the problem of becoming inefficient. In addition, in the case of electrical contacts, the metal part is exposed to the outside air, so there is a problem that it cannot be used for power supply to outdoor postings due to problems such as corrosion or rust, and further, people touch it by mistake. There is also a problem from the viewpoint of safety.

  Therefore, in view of such problems, as a power feeding method for the above-mentioned light emitting type posting, a non-contact type power feeding method using an electromagnetic induction action is examined instead of a conventional method using an electrical contact. Yes. That is, a power receiving coil is provided on the back surface of the organic EL display device as a posting, and a power feeding coil is provided at a position facing the power receiving coil in a range such as a wall on which the posting is posted. Is caused to generate an induced current in a power receiving coil at a position facing the power feeding coil by electromagnetic induction action, and the organic EL display device as a display connected to the power receiving coil is driven by this induced current (or The drive storage battery is charged).

  Here, in the case of the non-contact type power feeding method by electromagnetic induction using the opposing power receiving coil and power feeding coil described above, there is a problem that a so-called kickback voltage may be generated in principle on the power feeding coil side. is there.

  That is, in the case where power is supplied by electromagnetic induction to the power receiving coil by flowing the continuous pulsed current (voltage value Vd) shown in FIG. By charging with the current, the feeding coil already has a certain voltage when the next pulsed current is applied. In this case, if the power receiving coil is in a normal power supply state arranged at a predetermined position, even if the power supply coil already has a certain voltage at the time of applying the pulsed current, the voltage Is consumed for charging the power receiving coil, the kickback voltage Vk generated in the power feeding coil is not so high (see FIG. 6B).

  However, at this time, when there is no posting provided with the power receiving coil and, as a result, there is no power receiving coil facing the power feeding coil, the power receiving coil of the other party that consumes the kickback voltage Vk due to the immediately preceding pulse current As a result, the power supply coil itself becomes a high voltage, and as a result, the high voltage is directly applied to the supply circuit that supplies current to the power supply coil as a kickback voltage at the timing when the next pulsed current flows to the power supply coil. (See FIG. 6C).

  At this time, as a value of the kickback voltage in the case illustrated in FIG. 6C, specifically, when the power supply voltage as the supply circuit is 15 volts, it may reach hundreds of volts, and as a result The supply circuit itself may be destroyed.

  Therefore, the present invention has been made in view of the above-described problems, and the problem is that, from a kickback voltage in a power supply device that supplies power by a non-contact electromagnetic induction method, other circuits in the power supply device, etc. It is an object of the present invention to provide a power supply apparatus that can effectively protect the power supply and can effectively execute power supply after the kickback voltage is no longer generated.

  In order to solve the above problems, the invention according to claim 1 is an application of a power supply coil that supplies power to the power receiving unit by non-contact electromagnetic induction, and a transistor that applies power to the power supply coil. A power supply device including a power supply unit including: a detection unit such as a comparator for detecting a kickback voltage generated in the power supply coil; and the power supply coil by the application unit based on the detected kickback voltage. Stop means such as a power supply stop unit for stopping the supply of power to, and a check means such as an integrated circuit for checking whether or not the kickback voltage is generated again after the supply of power is stopped, When it is confirmed by the confirmation means that the kickback voltage does not occur again, the power of the power supply coil by the application means is reduced. Comprises a resuming unit, such as an integrated circuit to resume the feeding, the.

  Therefore, when it is detected that a kickback voltage is generated in the power supply coil, the power supply to the power supply coil by the applying unit is stopped. Therefore, even if a high-voltage kickback voltage is generated, the power supply device can be operated from the kickback voltage. Can be effectively protected.

  In addition, it is confirmed whether or not the kickback voltage is generated again, and when it is confirmed that the occurrence does not occur, the power supply is automatically restarted. Therefore, the power supply can be restarted more conveniently and effectively. Can do.

  In order to solve the above-described problem, according to a second aspect of the present invention, in the power feeding device according to the first aspect, the detecting means is connected between the power feeding coil and the applying means.

  Therefore, since the detecting means is connected between the applying means and the feeding coil, the detecting means is connected to the final output stage as the feeding device, so that the entire feeding device including the applying means can be effectively used. Protection from kickback voltage.

  In order to solve the above-mentioned problem, the invention according to claim 3 is the power supply device according to claim 1 or 2, wherein the detection means is a charge means such as a capacitor charged by the kickback voltage. Comparing means such as a comparator for detecting whether or not the voltage of the charged device that has risen due to the charging exceeds a preset threshold voltage, and the stopping device is configured such that the voltage of the charged device is When the threshold voltage is exceeded, the supply means is configured to stop the supply of power to the power supply coil.

  Therefore, since the detecting means is constituted by the charged means and the comparing means, the power supply device can be protected more safely by instantaneously detecting the occurrence of the kickback voltage and stopping the power supply to the power supply coil. Can do.

  In order to solve the above-mentioned problem, the invention according to claim 4 is the power feeding device according to any one of claims 1 to 3, wherein the power receiving unit includes a thin power receiving coil provided on the posting. The power feeding coil is disposed at a position facing the power receiving coil when the bulletin board is posted.

  Therefore, even when power is fed to the posting by non-contact electromagnetic induction, the power feeding device can be effectively protected.

  In order to solve the above-described problem, the invention according to claim 5 is the power feeding device according to any one of claims 1 to 4, wherein the confirmation unit is configured to perform the operation in advance after the supply of power is stopped. It is configured to check whether or not the kickback voltage is generated again after a set time has elapsed.

  Therefore, since the reoccurrence of the kickback voltage is confirmed after elapse of a preset time, power supply can be effectively restarted.

  In order to solve the above problem, according to a sixth aspect of the present invention, in the power feeding device according to the fifth aspect, the confirmation unit is configured such that the preset time elapses after the power supply is stopped. It is configured to repeatedly check whether or not the kickback voltage is generated again each time.

  Therefore, since it is repeatedly confirmed that the kickback voltage is regenerated every time a preset time elapses, power supply can be restarted by quickly confirming that the kickback voltage has not occurred.

  In order to solve the above-described problem, the invention according to claim 7 is configured such that in the power supply device according to claim 5 or 6, the preset time is 6 seconds.

  Therefore, since the preset time is 6 seconds, the power supply can be resumed without causing the user to feel inconvenience.

  As described above, according to the first aspect of the present invention, when it is detected that a kickback voltage is generated in the power supply coil, the power supply to the power supply coil by the applying unit is stopped. Even if the back voltage is generated, the power feeding device can be effectively protected from the kick back voltage.

  In addition, it is confirmed whether or not the kickback voltage is generated again. When it is confirmed that the kickback voltage is not generated, the power supply is automatically restarted. Therefore, the power supply can be restarted more conveniently.

  Therefore, it is possible to realize a long-life non-contact power transmission system by ensuring the protection and convenience of use of the power feeding device.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the detecting means is connected between the applying means and the feeding coil, the final output stage as the feeding device is provided. By connecting the detection means, the entire power feeding device including the application means can be effectively protected from the kickback voltage.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, since the detecting means is configured by the charged means and the comparing means, the generation of the kickback voltage is instantaneously performed. By detecting the power supply to the power supply coil and stopping the power supply to the power supply coil, the power supply device can be protected more safely.

  According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, even when power is supplied to the posting by non-contact electromagnetic induction, it is effective. The power feeding device can be protected.

  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, since the reoccurrence of the kickback voltage is confirmed after elapse of a preset time, the effect Power supply can be resumed.

  According to the sixth aspect of the invention, in addition to the effect of the fifth aspect of the invention, it is repeatedly checked that the kickback voltage is regenerated every time a preset time elapses. After the voltage is no longer generated, it can be confirmed quickly and the power supply can be resumed.

  According to the invention described in claim 7, in addition to the effect of the invention described in claim 5 or 6, since the preset time is 6 seconds, the power can be supplied without causing the user to feel inconvenience. Can be resumed.

  Next, the best mode for carrying out the present invention will be described with reference to FIGS. In the embodiment described below, for an organic EL display used as a poster (hereinafter simply referred to as a display), a power supply apparatus that supplies driving power from the wall side on which the display is posted. This is an embodiment when the present invention is applied.

  1 is an external perspective view showing an outline of a power transmission system including a power supply device according to the embodiment, FIG. 2 is a block diagram showing a configuration of the power transmission system, and FIGS. It is a figure which shows the structure and operation | movement of a transmission system concretely.

  As shown in FIG. 1, the power transmission system S according to the embodiment includes a posting P including a display 40, a drive unit 30, a power receiving unit 20, and a power receiving coil 10, and the posting P The power feeding device SP according to the embodiment is formed at a position where the power receiving coil 10 and the like are to be located in the posting range PS of the wall W to be posted.

  The power feeding device SP includes a power feeding coil 1, a power feeding unit 2, and a detection unit 3. When the posting P is posted in the posting range PS of the wall W, the power feeding coil 1 The posting P is posted so that the power receiving coil 10 faces in parallel and is close to a distance of about 2 millimeters, for example.

  Next, a specific configuration will be described with reference to FIG.

  As shown in FIG. 2, the power supply device SP according to the embodiment includes, for example, a male plug 100 to be inserted into a female plug (wall outlet) (not shown) to which AC power of 100 volts is supplied, a power supply unit B, The feeding unit 2 and the feeding coil 1 are included in the feeding device SP.

In this arrangement, when the female alternating from the plug current S ₁₀₀ relative to the male plug 100 is supplied actually to the power supply unit B configured as a so-called AC adapter or the like, the alternating current S ₁₀₀ eg DC This is converted into a 12 volt power supply current and output to the power supply unit 2 as a power supply signal Sb.

  As a result, the power supply unit 2 converts the power supply signal Sb into a pulsed power supply signal Ss having a preset frequency (for example, 270 kilohertz), and supplies the power supply signal Ss to the power supply coil 1. The preset frequency can be changed according to the specifications of the feeding coil 1 and the receiving coil 10.

  On the other hand, the posting P according to the embodiment includes the power receiving coil 10, the power receiving unit 20, the driving unit 30, and the display 40.

  In this configuration, the power receiving coil 10 is in a position facing the power feeding coil 1 in the vicinity of and in parallel with the power receiving coil 1 in a state where the posting P is posted at the predetermined position. Is configured. In this state, when the power supply signal Ss is supplied to the power supply coil 1, an induced electromotive force corresponding to the magnitude is generated in the power reception coil 10, so that the power reception coil 10 supplies the power reception unit 20. A power reception signal Sps is output.

  Next, the power reception unit 20 to which the power reception signal Sps is input processes the current and voltage in the power reception signal Sps and outputs the processed current and voltage to the drive unit 30 as the drive signal Srb.

  As a result, the drive unit 30 generates a drive signal Sd for driving the display 40 based on the drive signal Srb, and outputs the drive signal Sd to the display 40 to display on the display 40.

  Next, a specific circuit configuration and functions of the power supply apparatus SP according to the embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a circuit diagram illustrating the configuration of the power supply apparatus SP according to the embodiment, and FIG. 4 is a timing chart showing the operation of automatic power supply return in the power supply apparatus SP.

  As shown in FIG. 3, the power supply device SP to which the power supply signal Sb from the power supply unit B is supplied as the power supply Vcc includes capacitors C16 and C17, resistors R1 to R3, R17, R18, R24 and R25, and an integrated circuit IC1. And a power supply stopping unit 7 as a stopping means in which transistors Q1, Q5 and Q6 which are active elements for switching are connected as shown in FIG. 3, a diode D4 made of a Schottky diode, resistors R15 and R22, The smoothing circuit 5 in which the capacitor C13 and the capacitor C14 are connected as shown in FIG. 3, the integrated circuit IC3, the capacitors C1, C3, C6, C7 and C15 and the resistors R8, R12, R16, R19 and R20 are shown in FIG. And a comparator 6 as a detecting means and a comparing means connected as shown in FIG. It has been. As constituent members other than the power supply stop unit 7, the smoothing circuit 5, and the comparator 6, diodes D2 and D3 and resistors R4 to R7, R10, R13, R14, R21 to R23, as shown in FIG. R26 to R28, capacitors C2, C4, C5, C8, C9, C11, C12, C18, C19 and C21, electrolytic capacitors C10 and C20, transistors Q2 and Q3, transistor Q4 as an application means, and integration A circuit IC2, an integrated circuit IC4 as confirmation means, and an integrated circuit IC5 as restart means are included.

  Next, the operation will be described.

  In the circuit configuration shown in FIG. 3, the transistor Q4 connected to the final output stage as the power feeding unit 2 is directly connected to the power feeding coil 1, and the drain terminal (output terminal) of the transistor Q4 has One end of a capacitor C12 as a charging means having a small capacity (for example, 39 picofarad) is connected via a resonance capacitor C11, and the other end of the capacitor C12 is connected to voltage dividing resistors R13 and R14. And is connected to the smoothing circuit 5 from a connection point between the resistor R13 and the resistor R14.

  Here, when the above-described kickback voltage is generated in the power supply coil 1 for the reason that the posting P is removed before the power supply from the power supply unit B to the power supply device SP (power supply by the output of the power supply signal Sb) is not stopped. This is directly applied to the transistor Q4, thereby causing high voltage breakdown of the transistor Q4.

  Therefore, in the power supply device SP according to the embodiment, a small-capacitance capacitor C12 is provided between the transistor Q4 and the power supply coil 1. Thus, when the kickback voltage is generated in the power feeding coil 1, the capacitor C12 is charged by the kickback voltage.

  When the capacitor C12 is charged, the terminal voltage at both ends of the capacitor C12 increases, and the increased terminal voltage is input to the comparator 6 through the voltage dividing resistors R13 and R14 and the smoothing circuit 5. As a result, the comparator 6 compares the terminal voltage of the capacitor C12 input after the voltage division with the threshold voltage set in advance by the resistance values of the resistors R19 and R20.

  Thus, when the comparator 6 detects that the terminal voltage of the capacitor C12 exceeds the threshold voltage, that fact is immediately transmitted from the integrated circuit IC3 to the power supply stop unit 7 via the resistor R2, thereby In the power supply stop unit 7, the transistor Q <b> 1 is turned off, and supply of power to the power supply unit 2 is stopped even when power supply from the power supply unit B is continued.

  Here, since the kickback voltage detection operation described above and the power supply stop operation by the power supply stop unit 7 are executed in an instant, a high kickback voltage is consequently generated in the power supply coil 1. Even if it is generated and applied in reverse, the power supply stop operation by the power supply stop unit 7 is instantaneously performed, so that each component in the power supply unit 2 including the transistor Q4 can be protected. .

  The reason why the capacitance of the capacitor C12 is small as described above is that the capacitor C12 can quickly and surely detect the kickback voltage as a condition that the capacitor C12 should have. This is because it is necessary to provide two points: that the presence of the capacitor C12 does not affect the waveform of the power supply signal Ss. At this time, if these two conditions are satisfied, the capacitance of the capacitor C12 can be further reduced. However, if it is too small, it becomes necessary to consider the stray capacitance of the circuit. The capacitor C12 has a capacitance of 39 picofarads as described above.

  Next, the operation until the resumption of power supply after the supply of power to the power supply unit 2 is temporarily stopped will be described with reference to FIG. The restart operation is realized mainly by the timer function in the integrated circuit IC4 as the confirmation unit and the integrated circuit IC5 as the restart unit.

That is, as shown in the uppermost part of FIG. 4, if the receiving coil 10 moves from a position that opposes the feeding coil 0 by removing the posting P (see timing t <b> ₁ in FIG. 4), two from the top of FIG. As shown in the third and third stages, the kickback voltage generated in the power supply signal Ss due to this is detected by the comparator 6 (see S1 in FIG. 4), and as shown in the fourth stage from the top of FIG. In addition, the supply of power to the power supply unit 2 is immediately stopped by the operation of the power supply stop unit 7 described above (see S2 in FIG. 4). Then, as shown in the third row from the bottom of FIG. 4, timing in the integrated circuit IC4 is started (see S3 in FIG. 4). Here, in the integrated circuit IC 4, the timing is decided to stop the time T ₁ after the counting starts the clock in it.

Incidentally, the time T ₁ is temporarily removed the bulletin P is a predetermined position (i.e., the feeding coil 1 and the power receiving coil 10 is positioned opposite) when re-posted on, the power supply with respect to the bulletin P It is set in advance as an allowable time until the display on the display 40 is restarted (in other words, a time that a person who reposts the posting P can wait without recognizing a failure or the like until the display is restarted). The specific value is, for example, 6 seconds, but the length can be freely set.

Next, as shown in the second stage from the bottom 4, the counting in the integrated circuit IC4 is stopped at timing t _2, the at timing t ₂ is now clocked at the integrated circuit IC5 is started (see FIG. 4 numeral S4 ). Here, the integrated circuit IC5 is the timing is decided to stop the time T ₂ after the counting starts the clock in it. Note that the time T ₂ are, at least, what is previously set as a time longer than the time that is considered necessary to the supply of the power supply power to the feeding portion 2 from the detection of the kickback voltage is stopped completely The specific value is, for example, 0.1 seconds.

  Then, at the same time as the time measurement in the integrated circuit IC5 is started, the supply power supply stop operation by the power supply stop unit 7 for the power supply unit 2 is canceled (see S5 in FIG. 4). The supply of Ss is resumed (see S6 in FIG. 4).

Thereafter, at the timing t ₃ when the supply is resumed in the feed signal Ss, if when still remains bulletin P is removed, and that this occurs kickback voltage described above can again be detected by the comparator 6 Therefore, the supply stop operation of the power supply by the power supply stop unit 7 with respect to the power supply unit 2 shown as reference signs S1 and S2 in FIG. 4 is executed again (see reference signs S7 and S8 in FIG. 4). The same supply resuming operation as shown as S3 to S6 is repeated as shown as S9 to S12 in FIG.

  Then, the operation of the above-described series of supply of power to the power feeding unit 2 is stopped → 6 seconds standby → supply restart → supply stop → 6 seconds standby → ... the posting P is posted again at a predetermined position and kicked. The process is repeated until the back voltage is not generated (that is, until the supply stop operation by the power supply stop unit 7 is not executed). As a result, the power supply to the power supply unit 2 can be stopped until the posting P is re-posted, thereby reliably preventing the kickback voltage from being generated, and immediately after the posting P is correctly posted again, power is supplied immediately. Supply of power to the unit 2 is resumed, and power supply to the posting P is resumed.

  Next, a detailed configuration of the power feeding unit 20 that receives power from the power feeding device SP according to the above-described embodiment by electromagnetic induction will be specifically described with reference to a circuit diagram illustrated in FIG.

  As shown in FIG. 5, the power receiving unit 20 connected to the power receiving coil 10 includes a bridge circuit BG in which diodes D11 to D14 are bridge-connected, electrolytic capacitors C30 to C31, a capacitor C32, and resistors R30 to R34. The three-terminal regulator RG and the display diode D10 are output from the output terminal (shown as “Vout” in FIG. 5) of the power receiving unit 20 as the drive signal Srb.

  In addition to the circuit described above, as a method for detecting that the posting P has moved away from the original posting position, it is also possible to optically detect the presence or absence of the posting P. However, in the case of the optical detection, something other than the original posting P (for example, a human hand or a baggage unrelated to the posting P) is located at the front position of the optical sensor for optical detection. If it is placed, it will be detected optically as if the posting P was posted, and in this case, when the supply of power to the power supply unit 2 is started, it should be posted originally Even when the posted item P is not posted (that is, there is no power receiving coil 10 to be opposed to the power feeding coil 1), power supply to the power feeding unit 2 is supplied. This means that the kickback voltage is generated.

  Therefore, in the power supply apparatus SP of the embodiment, when the kickback voltage is generated by the operation of the capacitor C12, the comparator 6, and the power supply stop unit 7 without detecting the optical posting P described above. Immediately the supply of power to the power supply unit 2 is forcibly stopped.

  As described above, according to the operation of the power supply apparatus SP according to the embodiment, when it is detected that the kickback voltage is generated in the power supply coil 1, the power supply to the power supply coil 1 by the power supply unit 2 is stopped. Even if a high kickback voltage is generated, the power supply device SP can be effectively protected from the kickback voltage.

  In addition, it is confirmed whether or not the kickback voltage is generated again, and when it is confirmed that the occurrence does not occur, the power supply is automatically restarted. Therefore, the power supply can be restarted more conveniently and effectively. Can do.

  Further, since the capacitor C12 is connected between the transistor Q4 and the power supply coil 1, the entire power supply device SP including the power supply unit 2 is connected by connecting the capacitor C12 to the final output stage as the power supply device SP. Can be effectively protected from kickback voltage.

  Furthermore, since the kickback voltage detection circuit is configured by the capacitor C12 and the comparator 6, power can be supplied more safely by instantaneously detecting the occurrence of the kickback voltage and stopping the power supply to the power supply coil 1. The device SP can be protected.

  In addition, even when power is supplied to the posting P by non-contact electromagnetic induction, the power feeding device SP can be effectively protected.

Further, since the check the reoccurrence of the kick-back voltage to the predetermined time T ₁ after can resume effectively powered.

Furthermore, since repeated to confirm the re-occurrence of the kickback voltage whenever the said time T ₁ is passed, it can be resumed quickly powered confirm it after kickback voltage no longer occurs.

Further, since the time T ₁ is a 6 seconds, it is possible to resume the power supply without causing inconvenience to the user.

  As described above, the present invention can be used for protection on the side of the power feeding device in the field of non-contact power transmission using electromagnetic induction, and particularly posted on an outdoor or indoor wall. In the field of goods or advertisements, a particularly remarkable effect can be obtained if applied to the protection of a power supply device when the postings or advertisements are electrically driven.

1 is an external perspective view showing an outline of a power transmission system including a power feeding device according to an embodiment. It is a block diagram which shows the structure of the electric power transmission system which concerns on embodiment. It is a circuit diagram which shows the structure of the electric power feeder which concerns on embodiment. It is a timing chart which shows operation | movement of the electric power feeder which concerns on embodiment. It is a circuit diagram which shows the structure of the power receiving part which concerns on embodiment. It is a figure explaining the problem of a prior art, (a) is a figure which illustrates the waveform of the electric current applied to a feeding coil, (b) is a figure which illustrates the voltage change of the feeding coil in a normal feeding state. (C) is a figure which illustrates the voltage change of a feed coil when a receiving coil does not exist.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feeding coil 2 Feeding part 5 Smoothing circuit 6 Comparator 7 Power supply stop part 40 Display 30 Drive part 20 Power receiving part 10 Power receiving coil 100 Male plug S Electric power transmission system P Posted object W Wall PS Posted range SP Power feeder B Power source S ₁₀₀ AC current Sb power supply signal Sd detection signal Ss power supply signal Sps power reception signal Srb drive signal Sd drive signal C1, C2, C3, C4, C5, C6, C7, C8, C9, C11, C12, C13, C14, C15, C16 , C17, C18, C19, C21, C32 capacitors C10, C20, C30, C31 electrolytic capacitors R1, R2, R3, R4, R5, R6, R7, R8, R10, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28, R30, R31, R32, R33, R34 Resistor IC1, IC2, IC3, IC4, IC5 Integrated circuit D2, D3, D4, D10, D11, D12, D13, D14 Diodes Q1, Q2, Q3, Q4, Q5 Transistor BG Bridge circuit RG Three-terminal regulator

Claims (7)

In a power supply apparatus including a power supply unit that includes a power supply coil that supplies power to the power reception unit by non-contact electromagnetic induction, and an application unit that applies power to the power supply coil.
Detecting means for detecting a kickback voltage generated in the feeding coil;
Stop means for stopping the supply of power to the power supply coil by the applying means based on the detected kickback voltage;
Confirmation means for confirming whether or not the kickback voltage is generated again after the supply of power is stopped;
Resuming means for resuming the supply of power to the power supply coil by the applying means when the confirmation means confirms that the kickback voltage is not generated again;
A power supply apparatus comprising: In the electric power feeder of Claim 1,
The power supply apparatus, wherein the detection unit is connected between the power supply coil and the application unit. In the electric power feeder of Claim 1 or 2,
The detection means includes
Means to be charged by the kickback voltage;
Comparing means for detecting whether or not the voltage of the charged means that has risen due to the charging exceeds a preset threshold voltage;
With
The power supply apparatus, wherein the stopping unit stops the supply of the power to the power supply coil by the applying unit when the voltage of the charged unit exceeds the threshold voltage. In the electric power feeder as described in any one of Claim 1 to 3,
The power receiving unit includes a thin power receiving coil provided on a posting,
The power feeding device is characterized in that the power feeding coil is disposed at a position facing the power receiving coil when the posting is posted. In the electric power feeder as described in any one of Claim 1 to 4,
The power supply apparatus according to claim 1, wherein the confirmation unit confirms whether or not the kickback voltage is generated again after a lapse of a preset time after the supply of power is stopped. In the electric power feeder of Claim 5,
The power supply apparatus according to claim 1, wherein the confirmation unit repeatedly confirms whether or not the kickback voltage is generated again every time the preset time elapses after the supply of power is stopped. In the electric power feeder of Claim 5 or 6,
The power feeding apparatus according to claim 1, wherein the preset time is 6 seconds.

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