JP6545104B2 - Resonance type power transmission device - Google Patents

Description

  The present invention relates to a resonant power transmission device that performs power transmission at a high frequency.

  FIG. 3 shows a resonant power transmission device according to the prior art. In this resonant power transmission device, a transmission antenna 101 including an inductor (coil) L11 is connected to an output of a class E transmission power supply (see, for example, Non-Patent Document 1).

2013 IEICE General Conference BCS-1-16

  As described above, in the prior art disclosed in Non-Patent Document 1, the resonant power transmission apparatus is configured by connecting the transmission antenna 101 to the output of the class E transmission power supply. Therefore, the mounting space by the coil components to be used is required widely, and the subject that it becomes the hindrance of size reduction of a device, weight reduction, and cost reduction arises.

  The present invention has been made to solve the problems as described above, and can achieve miniaturization, weight reduction and cost reduction of the device, and a resonant power transmission capable of high frequency operation of 2 MHz or more. It is intended to provide a device.

The resonant power transmission device according to the present invention includes an inductor, one end connected to the inductor, a DC voltage applied to the one end through the inductor, and a power element performing switching operation at a high frequency of 2 MHz or more, and an output section is a totem pole. A high frequency pulse drive circuit for sending a high frequency pulse signal of 2 MHz or higher to the power element and driving the power element, and a high frequency pulse voltage signal of 2 MHz or higher for the high frequency pulse drive circuit. A variable power pulse signal generation circuit for driving the high frequency pulse drive circuit, a bias power supply circuit for supplying drive power to the variable pulse signal generation circuit and the high frequency pulse drive circuit, and zero voltage switching. Capacitors for resonant switching of power devices and A resonant circuit element comprising a coil and a power transmission transmitting antenna for transmitting power output by the switching operation of the power element, the coil constituting the resonant circuit element also serving as a power transmission transmitting antenna, and the resonant circuit The capacitor constituting the element is connected at one end to the one end of the power element and at the other end to the first capacitor connected to one end of the transmission antenna for power transmission, and one end is connected to the other end of the power element The other end includes a second capacitor connected to the other end of the power transmission transmission antenna.

  According to the present invention, since the apparatus is configured as described above, the size, weight and cost of the device can be reduced, and high frequency operation of 2 MHz or more becomes possible.

It is a figure which shows the structure of the resonance type electric power transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows another structure of the resonance type power transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the conventional resonant type electric power transmission apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1
FIG. 1 is a diagram showing the configuration of a resonant power transmission apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the resonant power transmission apparatus is a resonant transmission antenna (power transmission transmission antenna) including a power element Q1, a resonant circuit element (capacitors C1, C2 and C11 and an inductor L11), a capacitor C11 and an inductor L11. 1), an inductor L1, a high frequency pulse drive circuit 2, a variable pulse signal generation circuit 3 and a bias power supply circuit 4.

  The power element Q1 is a switching element that performs a switching operation to convert an input DC voltage Vin into an AC. The power element Q1 is not limited to a field effect transistor (FET; Field Effect Transistor) for RF (Radio Frequency), and for example, an element such as Si-MOSFET, SiC-MOSFET, or GaN-FET can be used. .

  The resonant circuit elements (capacitors C1, C2, C11 and an inductor L11) are elements for performing resonant switching of the switching operation of the power element Q1. The resonance condition can be matched with the resonance type transmission antenna 1 by the resonance circuit element including the capacitors C1, C2, C11 and the inductor L11. The capacitor C2 is a variable capacitance element. Then, by varying the capacitance value of the capacitor C2, it is possible to adjust the resonant frequency of the resonant power transmission device.

  The resonant transmission antenna 1 including the capacitor C11 and the inductor L11 transmits the power output by the switching operation of the power element Q1, and is a resonant antenna for power transmission having LC resonance characteristics (non-contact type Not limited to). The resonant transmission antenna 1 may be any of a magnetic field resonance type, an electric field resonance type, and an electromagnetic induction type. Here, the inductor L11 is used as the resonant transmission antenna 1 and as a resonant circuit element (resonator).

  The inductor L1 functions to temporarily hold energy of the DC voltage Vin of the input for each switching operation of the power element Q1.

  The high frequency pulse drive circuit 2 is a circuit that sends a pulsed voltage signal having a high frequency of 2 MHz or more to the G terminal of the power element Q1 to drive the power element Q1. The high frequency pulse drive circuit 2 is a circuit configured such that a high speed ON / OFF output can be performed by forming an output section using a FET element or the like in a toe pole circuit configuration.

  The variable pulse signal generation circuit 3 is a circuit that sends a high-frequency pulse signal voltage of 2 MHz or more such as a logic signal to the high frequency pulse drive circuit 2 to drive the high frequency pulse drive circuit 2. The variable pulse signal generation circuit 3 is constituted by an oscillator for frequency setting and a logic IC such as a flip flop or an inverter, and has functions such as change of pulse width and inverted pulse output.

  The bias power supply circuit 4 supplies drive power to the variable pulse signal generation circuit 3 and the high frequency pulse drive circuit 2.

Next, the operation of the resonant power transmission apparatus configured as described above will be described.
First, the input DC voltage Vin is applied to the D terminal of the power element Q1 through the inductor L1. Then, the power element Q1 converts the voltage into an alternating voltage of positive voltage by switching operation of ON / OFF. At the time of this conversion operation, the inductor L1 functions to temporarily hold energy to help convert direct current into alternating current.

Here, the switching operation of the power element Q1 is a resonant circuit including capacitors C1, C2, C11 and an inductor L11 such that ZVS (zero voltage switching) is established such that the switching loss due to the Ids current and the Vds voltage product is minimized. Resonant switching conditions are set in the element. By this resonant switching operation, an alternating voltage centered on the RTN voltage is input to the resonant transmission antenna 1. Further, by adjusting the capacitance value of the variable capacitor C2, it is possible to adjust the resonant frequency of the resonant power transmission device.
Then, the resonant transmission antenna 1 transmits the power output by the switching operation of the power element Q1.

  For driving the power element Q1, a pulse-shaped voltage signal output from the high-frequency pulse drive circuit 2 which has received an arbitrary pulse-shaped voltage signal from the variable pulse signal generating circuit 3 is input to the G terminal of the power element Q1. It is done by. At this time, the driving frequency of the power element Q1 is the operating frequency of the resonant power transmission apparatus, and is determined by the setting of the oscillator circuit in the variable pulse signal generating circuit 3.

  As described above, according to the first embodiment, the coil of the resonant power transmission device is configured to be used as the resonant transmission antenna 1 as a resonant circuit element (resonator). This makes it possible to reduce the size, weight and cost of the apparatus compared to the conventional configuration. Further, since the power loss due to the conventional coil can be reduced, the power loss of the entire device can be reduced.

  Although FIG. 1 shows the case where high frequency pulse drive circuit 2, variable pulse signal generation circuit 3 and bias power supply circuit 4 are used to drive power element Q1, the present invention is not limited to this. It is also possible to use a die drive circuit, an RF power amplifier circuit, and a multi-output type power supply circuit.

  Further, the present invention is not limited to the resonant power transmission device having the configuration as shown in FIG. 1, and may have a configuration as shown in FIG. 2, for example. In the resonant power transmission device shown in FIG. 2, the capacitors C2 and C3 are variable capacitors, and the resonance frequency can be adjusted by varying the capacitance value of the capacitors C2 and C3.

  Further, within the scope of the invention of the present application, it is possible to deform any component of the embodiment or omit any component of the embodiment.

  The resonance type power transmission device according to the present invention can achieve miniaturization, weight reduction and cost reduction of the device, enables operation at high frequency of 2 MHz or more, and performs power transmission at high frequency. It is suitable for use in devices and the like.

  1 Resonant transmission antenna (power transmission antenna), 2 high frequency pulse drive circuit, 3 variable pulse signal generation circuit, 4 bias power supply circuit.

Claims (5)

An inductor,
A power element having one end connected to the inductor, a DC voltage applied to the one end through the inductor, and performing switching operation at a high frequency of 2 MHz or more ;
A high frequency pulse drive circuit which has a totem pole circuit configuration, sends a pulse-like voltage signal of high frequency of 2 MHz or more to the power element, and drives the power element;
A variable pulse signal generation circuit for sending a high frequency pulse-like voltage signal of 2 MHz or more to the high frequency pulse drive circuit to drive the high frequency pulse drive circuit;
A bias power supply circuit for supplying drive power to the variable pulse signal generation circuit and the high frequency pulse drive circuit;
A resonant circuit element comprising a capacitor and a coil for performing resonant switching of the power element such that zero voltage switching is established;
And a transmitting antenna for transmitting power, which transmits the power output by the switching operation of the power element,
The coil constituting the resonant circuit element also serves as the transmission antenna for power transmission,
The capacitor constituting the resonant circuit element is a first capacitor whose one end is connected to one end of the power element and the other end is connected to one end of the power transmission transmission antenna, and the other end is the other of the power element What is claimed is: 1. A resonant power transmission device comprising: a second capacitor connected to an end and the other end connected to the other end of the power transmission transmission antenna. The resonant power transmission device according to claim 1, wherein the power element is a field effect transistor other than a field effect transistor for RF. The resonant power transmission device according to claim 1, wherein the power transmission transmission antenna performs power transmission by magnetic field resonance. The resonant power transmission device according to claim 1, wherein the power transmission transmission antenna performs power transmission by electric field resonance. The said transmission antenna for electric power transmissions transmits electric power by an electromagnetic induction. The resonance type electric power transmission apparatus of Claim 1 characterized by the above-mentioned.

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