Wireless power supply device

Abstract

In a wireless power supply device having a plurality of intermediate power transmitting / receiving devices (11) that receive power, supply the received power to a connected load, and transmit power to the next power transmitting / receiving device, each of the plurality of intermediate power transmitting / receiving devices (11) has a power receiving device (101) that receives power and a power transmitting device (104) that can transmit power, and a voltage control device (102) is connected to the downstream of the power receiving device (101) for keeping the voltage at each intermediate power transmitting / receiving device within a certain range regardless of the load. This makes it possible to control each load voltage within a specified range, thereby improving efficiency.

Description

[Technical field]

[0001] The present application relates to a wireless power supply device. [Background technology]

[0002] There is a magnetic field coupling type wireless power supply technology that transmits power wirelessly via a magnetic field. In this magnetic field coupling type wireless power supply technology, a technique is known in which a relay device is used to connect multiple wireless power supply devices in multiple stages and transmit power in sequence (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6681574 Summary of the Invention [Problem to be solved by the invention]

[0004] In a system that uses multiple relay devices to wirelessly supply power sequentially, it is necessary to control each relay device so that it can supply the desired voltage and power.However, if power is received as alternating current (AC) for control, converted to direct current (DC), and then converted back to AC for transmission, there are problems such as a complex device configuration, an increase in the number of parts, and increased losses.

[0005] The present application has been made to solve the problems described above, and aims to provide a wireless power supply device that improves efficiency by being able to control each load voltage within a predetermined range without having to convert from DC to AC again in each intermediate power transmitting / receiving device. [Means for solving the problem]

[0006] The wireless power supply device disclosed in the present application is The power transmission / reception device includes a plurality of intermediate power transmission / reception devices that receive power, supply the received power to a load device connected thereto, and transmit power to a next power transmission / reception device. The load device includes a rectifier and a load. sending Each of the power receiving devices includes a power receiving device having a power receiving coil and receiving power, a power transmitting device having a power transmitting coil and a resonant capacitor connected in series with each other and capable of transmitting power, a capacitor connected in parallel with the power receiving device, and a power transmitting device having one terminal connected to the capacitor and the other terminal connected to the power transmitting device and the load device. , connected in series with the parallel connection of the capacitor and the receiving coil, and connected in series with the resonant capacitor An inductor, 、 The output voltage of the first intermediate power transmitting / receiving device is a value obtained by multiplying the inverse of a coupling coefficient between the power transmitting coil of the first intermediate power transmitting / receiving device and the power receiving coil of the second intermediate power transmitting / receiving device located downstream of the first intermediate power transmitting / receiving device by the square root of the value obtained by dividing the inductance of the power receiving coil by the inductance of the power transmitting coil, and further multiplying this value by the input voltage of the second intermediate power transmitting / receiving device. The inductance value of the inductor and the inductance value of the power receiving coil are set to the same value, thereby keeping the voltage at each intermediate power transmitting / receiving device within a certain range. . Effect of the Invention

[0007] According to the wireless power supply device disclosed in the present application, each load voltage can be controlled within a predetermined range without converting DC to AC again in each intermediate power transmitting / receiving device, thereby improving efficiency. [Brief description of the drawings]

[0008] [Figure 1] 1 is an overall view of a wireless power supply device according to a first embodiment. [Diagram 2] FIG. 2 is a diagram illustrating a configuration of an intermediate power transmitting and receiving device according to the first embodiment. [Diagram 3] FIG. 2 is a diagram for explaining an arrangement of a plurality of intermediate power transmitting and receiving devices according to the first embodiment. [Figure 4] FIG. 2 is a diagram illustrating a configuration of a final stage of an intermediate power transmitting and receiving device according to the first embodiment. [Diagram 5] 4 is a diagram illustrating the inductance and coupling coefficient of each coil of the intermediate power transmitting and receiving device according to the first embodiment. FIG. [Figure 6] 5A to 5C are diagrams illustrating the operation of the wireless power supply device according to the first embodiment. [Figure 7] 3 is a diagram illustrating the on / off state of a semiconductor switch of the AC output power supply according to the first embodiment. FIG. [Figure 8] 8 is a diagram showing an example of an output voltage waveform during the semiconductor switching operation of FIG. 7. [Figure 9] 2 is a diagram for explaining the arrangement of a current detection unit of the AC output power supply according to the first embodiment. FIG. [Figure 10] 4 is a flowchart illustrating an operation of the wireless power feeder according to the first embodiment when there is no load. [Figure 11] 11 is a diagram for explaining the phase difference between current and voltage in FIG. 10. FIG. [Figure 12] FIG. 1 is a diagram showing a configuration of a first comparative example. [Figure 13] FIG. 13 is a diagram showing a configuration of Comparative Example 2. [Figure 14] FIG. 13 is a diagram showing a configuration of Comparative Example 3. [Figure 15] 1 is a diagram showing a range of conversion into an equivalent circuit, which explains the effect of the intermediate power transmitting and receiving device according to the first embodiment. FIG. [Figure 16] FIG. 16 is an equivalent circuit diagram of the range of FIG. [Figure 17] FIG. 2 is a diagram illustrating a configuration of a multi-stage connection of intermediate power transmitting and receiving devices according to the first embodiment. [Figure 18] 11 is a schematic configuration diagram of an AC output power source and a plurality of intermediate power transmitting and receiving devices according to a second embodiment. FIG. [Figure 19] 13 is a flowchart illustrating an operation of the wireless power feeder according to the second embodiment when there is no load. [Figure 20] FIG. 2 is a diagram illustrating an example of hardware of a controller according to the first and second embodiments. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the wireless power supply device according to the present application will be described with reference to the drawings. Note that the same contents and corresponding parts are given the same reference numerals, and detailed description thereof will be omitted. Similarly, in the following embodiments, duplicated description of the configurations given the same reference numerals will be omitted.

[0010] Embodiment 1 The basic configuration of the present embodiment will be described below. Fig. 1 is an overall view of a wireless power supply device for explaining the basic configuration of the first embodiment. <AC output power supply and transmitting coil> The power supply 01 converts DC power into AC power and outputs the AC power, the resonant module 02 is directly connected to the AC power supply 01, a first power transmitting coil 03, and a plurality of intermediate power transmitting and receiving devices 11, 12, . . . 1 x and a plurality of load devices 21, 22, . . . 2 x The AC output power supply 01 is configured as a full-bridge inverter in FIG. 1. Any type of semiconductor switch can be used. Also, as long as the switch configuration can convert DC to AC, it does not have to be a full-bridge configuration.

[0011] The resonant module 02 is configured with a capacitor. The simplest configuration is shown in Fig. 1 as a configuration in which a capacitor is connected in series to the first power transmitting coil 03, but other configurations may be used.

[0012] Intermediate power transmission and reception device Of the multiple intermediate power transmitting and receiving devices 11 to 1x, the intermediate power transmitting and receiving devices 11 to 1x-1 have the same configuration. An example of the configuration of the intermediate power transmitting and receiving device 11 is shown in Fig. 2. The intermediate power transmitting and receiving device 11 is composed of a receiving coil 101, a voltage control module 102, a resonant capacitor 103, a transmitting coil 104, and a load device 21. The voltage control module 102 is connected to the rear stage of the receiving coil 101. The load device 21 and a circuit consisting of the transmitting coil 104 and the resonant capacitor 103 are connected in parallel to the rear stage of the voltage control module 102. The resonant capacitor 103 and the transmitting coil 104 are connected in series.

[0013] The voltage control module 102 in the intermediate power transmitting / receiving device 11 is composed of a set of a capacitor and an inductor. The capacitor is connected in parallel to the receiving coil 101, and the inductor is connected in series to the parallel connection configuration of the capacitor and the receiving coil 101. Note that the configuration is not limited to the above example as long as the relationship described in <Settings of the intermediate power transmitting / receiving device> described later holds.

[0014] In the load device 21, a smoothing capacitor 202 is connected to the rear stage of a rectifying diode bridge 201, and a load 203 is connected to the rear stage. The load 203 may be an inverter, a motor, or various other load devices such as lighting. Although omitted in Fig. 1, a current detection unit 71 is connected to the AC output power source 01 so that a current can be detected, as shown in Fig. 9 described later.

[0015] <Arrangement of multiple intermediate power transmitting / receiving devices> The intermediate power transmitting and receiving devices 11 to 1x are arranged as follows. The power receiving coil 101 of the intermediate power transmitting and receiving device 11 is arranged adjacent to the first power transmitting coil 03 and is magnetically coupled to the first power transmitting coil 03. The power receiving coil 101 of the intermediate power transmitting and receiving device 12 is arranged adjacent to the power transmitting coil 104 of the intermediate power transmitting and receiving device 11 and is magnetically coupled to the first power transmitting coil 03. x The same arrangement is also configured.

[0016] Intermediate power transmitting / receiving device 1 after intermediate power transmitting / receiving device 13 i-1 ~1 i+1 The layout of the intermediate power transmitting and receiving device 1 is shown in FIG. i Receiving coil 101 i is the (i-1)th intermediate power transmitting / receiving device 1 i-1 Transmitting coil 104 i―1 and the i-th intermediate power transmitting / receiving device 1 i Transmitting coil 104 i is the (i+1)th intermediate power transmitting / receiving device 1 i+1 Receiving coil 101 i+1 and are placed closely together.

[0017] Intermediate power transmitting / receiving device 1 arranged at the final stage x The intermediate power transmitting / receiving device 1 is shown in FIG. x is a transmitting coil 104 x The portion has a circuit 60 that does not connect or opens the power transmission device downstream of the voltage control device, and is in an open state.

[0018] <Settings for intermediate power transmitting / receiving devices> Fig. 5 shows intermediate power transmission and reception device 1 i , 1 i+1 The inductance and coupling coefficient of each coil are shown. "Transmitting coil 104 i and receiving coil 101 i+1 "The inverse of the coupling coefficient k between the receiving coil 101 i+1 Inductance value L R The transmitting coil 104 i Inductance value L T The square root of the value divided by the voltage regulator is close to 1. i+1 The inductance value of the inductor is L C and receiving coil 101 i+1 Inductance value L R The reason for this configuration will be explained in detail later in the section "Explanation of why the voltage control module exhibits its effects."

[0019] <Operation of Wireless Power Supply Device> Next, the operation of this device will be described. If the number of intermediate power transmitting and receiving devices is not determined when explaining the operation example, the explanation will be complicated. i-1 , 1 i , 1 i+1 The following three cases will be described. i-1 ~1 i+1 Load device 2 i-1 ~2 i+1 Even if the number of intermediate power transmitting and receiving devices is increased or decreased, the basic operation remains the same.

[0020] First, the power-on sequence begins. At startup, three load devices 2 i-1 ~2 i+1 All are in an unloaded state. On the other hand, load device 2 i-1 ~2 i+1 Capacitor 202 i-1 ~202i+1 Since no charge is stored in this capacitor 202, i-1 ~202 i+1 During operation, active power is provided for charging the (1) The semiconductor switches Q1 to Q4 of the AC output power supply 01 are turned on and off at a predetermined frequency. That is, as shown in FIG. 7, a diagonal pair of switches is turned on or off. By this operation, for example, the output voltage becomes as shown in FIG. 8. This is the standard switching operation of a full-bridge inverter. This may be realized by phase shifting or PWM (Pulse Width Modulation). (2) A DC voltage V is input, and the states of semiconductor switches Q1 and Q4 turned off and Q2 and Q3 turned on, and Q1 and Q4 turned on and Q2 and Q3 turned off are repeated at a predetermined frequency. This causes the AC output power supply 01 to output an AC voltage Vout. (3) Through this operation, AC power is supplied to the resonance module 02 and the first power transmitting coil 03. When an AC current flows through the first power transmitting coil 03, a magnetic field is generated around the first power transmitting coil 03. (4) This magnetic field is applied to the intermediate power transmitting / receiving device 1. i―1 Receiving coil 101 i-1 The receiving coil 101 i-1 The induced electromotive force is generated and a current flows. The current generated here is fed to the voltage control module 102. i-1 Through, load device 2 i-1 Capacitor 202 i-1 Charge the battery. (5) At the same time, intermediate power transmitting / receiving device 1 i-1 Transmitting coil 104 i-1 This supplies a current to the power transmitting coil 104. i-1 A magnetic field is generated around the (6) This magnetic field is applied to the intermediate power transmitting / receiving device 1. i Receiving coil 101 i The receiving coil 101 i The induced electromotive force is generated and a current flows. The current generated here is fed to the voltage control module 102. i Through the intermediate power transmitting / receiving device 1i Capacitor 202 of load device 2i connected to i Charge the battery. (7) At the same time, intermediate power transmitting / receiving device 1 i Transmitting coil 104 i This supplies a current to the power transmitting coil 104. i When an AC current flows through the power transmission coil 104 i A magnetic field is generated around the (8) This magnetic field is applied to the intermediate power transmitting / receiving device 1. i+1 Receiving coil 101 i+1 The receiving coil 101 i+1 The induced electromotive force is generated and a current flows. The current generated here is fed to the voltage control module 102. i+1 Through the intermediate power transmitting / receiving device 1 i+1 Load device 2 connected to i+1 Capacitor 202 i+1 Charge the battery. (9) Here, each load device 2 i-1 ~2 i+1 However, as soon as the voltage exceeds a predetermined value, the load device 2 in this embodiment starts up and supplies power. i-1 ~2 i+1 The input voltages will be almost the same. (10) Intermediate power transmission and reception device 2 i+1 The final stage 1 x In this case, the transmitting coil 104 x The path to is left open by the circuit 60 shown in FIG.

[0021] <All no-load conditions> During operation, each load device 2 i-1 ~2 i+1 In such a case, all of the intermediate power transmitting and receiving devices 1 may be almost unloaded or extremely lightly loaded. i-1 ~1 i+1 In order to prevent the voltage of the intermediate power transmitting / receiving device 1 from excessively increasing, the following operation is performed. i-1The current detected by the current detection unit 71 is input to the controller 72, which controls the AC output power supply 01. A flow chart is shown in FIG. (1) The current of the current detector 71 is detected (step S1 in FIG. 10 ). i-1 ~104 i+1 The phase difference between the voltage and current (Phase difference in FIG. 11) is constantly monitored (step S2), and when it exceeds a predetermined phase difference and falls outside a predetermined range (step S3, No), it is determined that there is no load or a very light load (step S4) and the power supply is stopped (step S5). Alternatively, in phase shift control, an operation such as lowering the output voltage is performed. (2) Even after the phase difference falls outside the predetermined range, power is supplied at a predetermined timing. If the phase difference is within the predetermined range (step S3, Yes), power supply is continued again (step S6). If the phase difference is outside the predetermined range, it is determined that the no-load state continues, and power supply is not continued (step S5).

[0022] Explanation of advantages and effects compared to the configuration of the comparative example Here, the reason why the configuration of this embodiment is effective over Comparative Examples 1 to 3 will be described. Comparative Example 1 Comparative Example 1 may be a configuration in which the power received in an intermediate power transmitting / receiving device is converted to DC once and then converted to AC again, as shown in Fig. 12. For simplification, Fig. 12 shows three intermediate power transmitting / receiving devices 61-63. AC to DC and DC to AC conversion means (AC-DC-AC conversion means) are arranged inside the intermediate power transmitting / receiving devices 61-63. Load devices 21-23 are connected to the intermediate power transmitting / receiving devices 61-63, respectively.

[0023] The configuration of this comparative example 1 has the advantage that the supply voltage of each stage of the intermediate power transmitting and receiving devices 61-63 can be constantly controlled regardless of the device configuration. On the other hand, since AC to DC and DC to AC conversion is performed, losses occur, and the more connections there are, the greater the losses become. In addition, in order to perform AC-DC-AC conversion, an inverter and a semiconductor switch constituting the inverter, a control circuit for driving the semiconductor switch, and the like are required for each of the intermediate power transmitting and receiving devices 61-63, which leads to higher costs and an increase in device size.

[0024] Comparative Example 2 On the other hand, Fig. 13 shows a configuration in which power is supplied from the receiving coil to the next transmitting coil as AC without AC-DC-AC conversion. For simplification, the figure shows three intermediate power transmitting and receiving devices 81-83. The intermediate power transmitting and receiving devices 81-83 do not have AC-DC-AC conversion means. Load devices 21-23 are connected to the intermediate power transmitting and receiving devices 81-83, respectively.

[0025] This is a configuration in which the load devices 21 to 23 are connected in parallel to a series resonance type wireless power feeding configuration. In this configuration, it is possible to connect wireless power feeders in multiple stages and supply power. However, the voltage applied to each of the power transmitting coils 104-1 to 104-3 of the intermediate power transmitting and receiving devices 81 to 83 changes significantly depending on the power consumption of the load devices 21 to 23 connected to the intermediate power transmitting and receiving devices 81 to 83. There is a risk that the voltage will fluctuate further in the next stage, the stage after that, etc., where three or more connections are made, and there is a problem that wireless power feeding to each load cannot be achieved with an appropriate voltage.

[0026] That is, even if power can be supplied appropriately under certain conditions, fluctuations in power consumption in any one of the load devices 21-23 will affect the voltage of the entire connected stage. This problem is caused by the pseudo current source characteristics in the series resonant wireless power supply system. Since a constant current flows to the load side up to a certain range, fluctuations in the load impedance in the load devices 21-23 will cause fluctuations in the voltage. This voltage fluctuation changes the output voltage of the next stage. In other words, it is theoretically impossible to achieve a constant voltage (or keep the voltage within a certain range) across all stages of the intermediate power transmitting and receiving device.

[0027] Comparative Example 3. FIG. 14 shows an example of a configuration in which the load devices 21 to 23 are connected in series to a series resonance type wireless power supply. For simplification, the diagram shows three intermediate power transmitting and receiving devices 91 to 93. As in Comparative Example 2, the intermediate power transmitting and receiving devices 91 to 93 do not have AC-DC-AC conversion. When the load devices 21 to 23 are connected in series to the power transmitting coils and power receiving coils of the intermediate power transmitting and receiving devices 91 to 93, the effect of the applied voltage (current) fluctuation of the power transmitting coil due to the load power consumption fluctuation is reduced due to the pseudo current source characteristics in the series-connected wireless power supply system. However, in this configuration, if any one of the load devices 21 to 23 is in a no-load state or a light load state close to that, power supply cannot be executed. In a state close to no-load, that is, when the effective resistance value of the load devices 21 to 23 is large, the resonance characteristics are deviated and the current source characteristics are no longer maintained. In addition, even if the current source characteristics are maintained, the applied voltage across the load devices becomes excessive, which is not practical. If the load resistance increases while the current remains constant, the voltage increases.

[0028] In contrast to these Comparative Examples 1 to 3, in the configuration of the first embodiment shown in FIG. 1, the intermediate power transmitting and receiving devices 11 to 1 x Receiving coil 101~101 x Voltage control modules 102-102 x By connecting the load devices 21 to 2x and the power transmitting coils 104 to 104x in parallel, all of the problems in the comparative examples 1 to 3 described above are solved. x Since there is no AC-DC-AC conversion for each circuit, losses can be reduced and the size of the device and the number of components can be reduced.

[0029] Also, load device 21~2 x Regardless of the power consumption of the power transmission coils 104 to 104 xIt is possible to keep the voltage applied to each intermediate power transmitting / receiving device constant. Originally, this configuration had the problem that the voltage would increase when power consumption was low, but by adopting such a continuous connection type configuration, even if there is no power consumption in one intermediate power transmitting / receiving device, as long as there is power consumption in any intermediate power transmitting / receiving device and in the load device, it is possible to keep the voltage in each intermediate power transmitting / receiving device almost constant. In other words, it also supports the no-load state of the load device.

[0030] As an exception, when all the load devices are unloaded, the voltage will rise, but this can also be controlled by detecting the phase difference between the voltage and current on the AC output power supply 01 side using the method described above.

[0031] 〈Explanation of why the voltage control module is effective〉 Here, the reason why the configuration of the voltage control module 102 according to the first embodiment is effective will be described using an equivalent circuit and mathematical expressions. i , 1 i+1 Consider the equivalent circuit of the above. This may be considered as the circuit between the first power transmission coil 03 and the resonant module 02 in FIG. 1 and the intermediate power transmission / reception device 11. FIG. 15 shows the relevant part to be converted into an equivalent circuit. The part after the voltage control module is Z out_i+1 Figure 16 shows the equivalent circuit of the relevant part of Figure 15. Here, the impedances are Z1, Z2, Z3, and Z. The impedances are calculated as follows:

[0032]

number

[0033]

number

[0034]

number

[0035]

number

[0036]

number

[0037]

number

[0038]

number

[0039]

number

[0040] If the transmission efficiency, η, is set to 1, then

number

[0041] At this time, the output voltage V out_i+1 becomes:

number

[0042] Now substitute equations (12) and (13) into equation (11).

number

[0043]

number

[0044] From equation (14), the output voltage V out_i+1It can be seen that there is no load resistance dependence of the input voltage V in_j Output voltage V out_i+1 is determined by the coupling coefficient and coil inductances L1 and L2.

[0045] In other words, it has been shown that it is theoretically possible to keep the voltage at each intermediate power transmitting / receiving device within a certain range regardless of the load, even if multiple intermediate power transmitting / receiving devices are connected in multiple stages. For example, as shown in the following equation (15), the output voltage V out and the input voltage V in This is because the inverse of the coupling coefficient k between the transmitting coil and the receiving coil and the inductance value L of the receiving coil can be made equal. R (L2) is the inductance value L of the transmitting coil T This is the state in which the square root of the value divided by (L1) is set to 1.

[0046]

number

[0047] In practice, the output voltage V is determined by taking into account the transmission efficiency η. out and the input voltage V in For example, if the transmission efficiency is about 0.9, the power transmission coil (inductance value L T ) and the receiving coil (inductance value L R ) and the inductance value L R The inductance value L of the transmitting coil T The square root of the value divided by "is set to about 1.1. Figure 17 shows an equivalent circuit diagram and voltages when connected in multiple stages. This is equivalent to the equivalent circuit of the circuit in Figure 15, shown in Figure 16, connected in multiple stages. If the input voltage and output voltage of a certain intermediate power transmitting / receiving device are equal, this means that the input voltage and output voltage between the intermediate power transmitting / receiving devices connected in the subsequent stage will also be equal.

[0048] Embodiment 2 As shown in Fig. 18, in addition to the components of the first embodiment, the second embodiment further includes a wireless communication mechanism 08 between the intermediate power transmitting and receiving device 11 and the AC output power source 01. Although not shown, a wireless communication mechanism 08 is also provided between the intermediate power transmitting and receiving devices. A voltage detection unit 73 is disposed in the intermediate power transmitting and receiving device 11. A voltage detected by the voltage detection unit 73 is transmitted to the wireless communication mechanism 08. The transmitted voltage information is received by the controller 72.

[0049] Next, the operation will be described with reference to the flowchart in FIG. (1) The voltage of the voltage detection unit 73 is detected (step S11 in FIG. 19), and the controller 72 makes a judgment (step S12). If the detected voltage exceeds a predetermined range (step S13, No), it is judged that there is no load or a very light load (step S14), and the power supply is stopped (step S15). Alternatively, an operation such as lowering the output voltage is performed. (2) If the voltage is within a predetermined range (step S13, Yes), the power supply is continued again (step S16). If the voltage is outside the predetermined range, it is determined that the no-load state continues, and the power supply is stopped (step S15). (3) Even after the voltage goes outside the predetermined range, power is supplied at a predetermined timing. If the voltage falls within the predetermined range (step S13, Yes), power supply is continued again (step S16). If the voltage falls outside the predetermined range, it is determined that the no-load state continues, and power supply is not continued (step S15).

[0050] Such a configuration of the second embodiment makes it unnecessary to detect the phase difference between the current and the voltage. Also, in this configuration, it is not necessary to strictly manage the voltages of all intermediate power transmitting and receiving devices, and it is sufficient to detect the output voltage of one of the intermediate power transmitting and receiving devices. In a configuration in which wireless power supply devices are connected in multiple stages, some kind of communication module may be mounted between each device for practical application. In such a case, the configuration of this embodiment has an advantage in that the voltage value can be directly detected and controlled without any additional configuration.

[0051] An example of the hardware of the microcomputer in the controller 72 is shown in FIG. 20. It is composed of a processor 100 and a storage device 200. Although not shown, the storage device includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. Also, instead of the flash memory, an auxiliary storage device such as a hard disk may be included. The processor 100 executes a program input from the storage device 200 to control the unloaded state described above in FIG. 11 and FIG. 19. In this case, the program is input from the auxiliary storage device to the processor 100 via the volatile storage device. Also, the processor 100 may output data such as the result of calculation to the volatile storage device of the storage device 200, or may store the data in the auxiliary storage device via the volatile storage device.

[0052] Although the present application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in the present specification, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment. [Explanation of symbols]

[0053] 01: AC output power supply, 02: resonant module, 03: first transmitting coil, 08: wireless communication mechanism, 11, 12: intermediate transmitting / receiving device, 21, 22: load device, 71: current detection unit, 72: controller, 73: voltage detection unit, 100: processor, 101: receiving coil, 102: voltage control module, 103: resonant capacitor, 104: transmitting coil, 200: memory device, 201: diode bridge, 202: capacitor, 203: load.

Claims

1. A wireless power supply device including a plurality of intermediate power transmitting and receiving devices that receive power, supply the received power to a connected load device, and transmit power to a next power transmitting and receiving device, The load device includes a rectifier and a load. Each of the intermediate power transmitting and receiving devices is a power receiving device having a power receiving coil and receiving power; a power transmitting device having a power transmitting coil and a resonance capacitor connected in series with each other and capable of transmitting power; A capacitor connected in parallel with the power receiving device; an inductor having one terminal connected to the capacitor and the other terminal connected to the power transmitting device and the load device; A wireless power supply device comprising:

2. 2. The wireless power supply device according to claim 1, wherein the inductor is connected in series to the parallel connection of the capacitor and the power receiving coil, and is also connected in series to the resonant capacitor.

3. The wireless power supply device as described in claim 1, characterized in that each of the transmitting coil, the resonant capacitor, the receiving coil, the capacitor, and the inductor are configured so that a first resonant frequency between the transmitting coil and the resonant capacitor, a second resonant frequency between the receiving coil and the capacitor, and a third resonant frequency between the inductor and the capacitor are consistent with each other.

4. The wireless power supply device described in claim 2, characterized in that the value obtained by multiplying the inverse of the coupling coefficient between the transmitting coil of a first intermediate power transmitting / receiving device and the receiving coil of a second intermediate power transmitting / receiving device downstream of the first intermediate power transmitting / receiving device by the square root of the inductance of the receiving coil divided by the inductance of the transmitting coil is set to a value at which the output voltage of the first intermediate power transmitting / receiving device and the input voltage of the second intermediate power transmitting / receiving device are equal, and the inductance value of the inductor and the inductance value of the receiving coil are set to the same value, thereby keeping the voltage at each intermediate power transmitting / receiving device within a certain range.

5. 5. The wireless power supply device according to claim 1, further comprising a power transmission device connected to a power source and transmitting power to one of a plurality of intermediate power transmission / reception devices, wherein the power transmission device connected to the power source has a detection means for detecting a phase difference between an output voltage and an output current, and wherein if the detected phase difference is not within a predetermined range, the power transmission from the power source is stopped.

6. 5. The wireless power supply device according to claim 1, further comprising: a power transmitting device connected to a power source and transmitting power to one of a plurality of intermediate power transmitting and receiving devices; and detection means for detecting a voltage of the intermediate power transmitting and receiving device or the load, wherein the wireless power supply device stops transmitting power from the power source if the detected voltage is not within a predetermined range.

7. 6. The wireless power supply device according to claim 5, wherein the control for stopping the power transmission from the power source is performed by a controller.

8. 5. The wireless power supply device according to claim 1, wherein a final-stage intermediate power transmitting / receiving device of the plurality of intermediate power transmitting / receiving devices is provided with a configuration for not transmitting power to a subsequent stage.

Images