KR101787991B1

KR101787991B1 - Magnetic inductive pick-up apparatus

Info

Publication number: KR101787991B1
Application number: KR1020160004256A
Authority: KR
Inventors: 조정구; 유효열; 송두익; 민병덕
Original assignee: (주)그린파워
Priority date: 2016-01-13
Filing date: 2016-01-13
Publication date: 2017-10-23
Also published as: KR20170084870A

Abstract

The magnetic induction pickup device according to the present invention includes a resonance inductor and a pickup coil magnetically coupled to the primary side, Pickup nose part; A first resonator including a first capacitor and having one end coupled to a pickup coil part in series to form a first resonance current; A second resonator comprising a second capacitor and selectively forming a second resonant current in parallel or in series with the pickup coil part; And a rectification section including a first output terminal and a second output terminal connected to the load and rectifying a first resonance current from the other end of the first resonance section to supply an output voltage to the load, And a second resonance part is variable in accordance with a duty ratio of selectively resonating in parallel with the pick-up coil part or a ratio of a capacitance of the first capacitor and a capacitance of the second capacitor.
As a result, the magnetic induction pickup device according to the present invention not only reduces the current stress of the switching element by shunting the resonance current of the capacitor that resonates in series with the pickup coil, and adjusts the resonance current by the resonance current, The power can be effectively regulated.

Description

[0001] Magnetic inductive pick-up apparatus [0002]

The present invention relates to a magnetic induction pickup device, and more particularly, to a pickup device for receiving electric power by magnetic induction from a primary AC power source, the pickup device comprising: a resonance circuit for dividing a resonance current of a capacitor in series resonance with a pickup coil, To a magnetic induction pickup device capable of not only reducing a current stress of a switching element but also effectively regulating power transmitted to a load by adjusting a resonance current.

In recent years, power transmission by magnetic induction has been widely used in cases where power is coupled from one power source to the load side without physical contact in various industries. A general structure of a power transmission system by magnetic induction is as follows. A primary conductor (at least one) that is energized by an AC is provided. The primary conductor is inductively coupled to a changing magnetic flux surrounding the primary conductor and converted into electric energy One or more secondary or pick-up devices. If necessary, these pick-up devices are designed to be movable and move along the sides of the primary conductors, or sometimes move away from the primary conductors when energy accumulation is possible internally.

As an example, such a magnetic induction power transmission system can be applied to a transport bogie moving along a track. The wireless power transmission device that transmits electric power in a non-contact manner to a transport bogie moving along a track is widely used in a clean room environment such as semiconductor and LCD manufacturing line due to the fact that there is no mechanical contact and dust is not generated, .

The magnetic induction power transmission system includes a primary side inverter for feeding a high frequency current to an induction line and a secondary side pickup device for receiving power by induction coupling with the induction line. The pickup device includes a high frequency A resonance capacitor which resonates at a predetermined frequency with the inductance of the pickup coil, a rectifier which rectifies the voltage induced in the pickup coil, and a regulator which constantly controls the rectified DC voltage, .

1 and 2 show a conventional magnetic induction pickup device (Patent Document 1).

1 is a series-parallel-tuned LCL (inductor-capacitor-inductor) pickup topology that includes a pickup coil L2 for obtaining an induced electromotive force from a high frequency magnetic flux generated in an induction line L1 and an inductance A resonance capacitor C3 that resonates at a predetermined frequency with a predetermined frequency, a rectifier D that rectifies the voltage induced in the pickup coil, and optionally a regulator S that constantly controls the rectified DC voltage .

The magnetic induction-pickup device of Fig. 2 has the configuration that the switch S constituting the regulator of the pickup apparatus shown in Fig. 1 is composed of the switches S1 and S2 combined with the rectifier diodes D1 and D2 Which is different from the pick-up apparatus shown in Fig.

However, as shown in Figs. 1 and 2, since the conventional magnetic induction pickup apparatus switches the entire resonance current flowing from the rectifier to the load side in order to regulate the voltage or current to the load side, the switch element S , S1, S2) is large.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-2013-0139239 (December 20, 2013)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a pickup apparatus for receiving power from a primary AC power source by magnetic induction, Up device that can reduce the current stress of the switching element and regulate the power transmitted to the load by adjusting the resonance current.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to an aspect of the present invention, there is provided a magnetic induction pickup device for receiving AC power transmitted from a primary side in a magnetic induction manner, the device including: a resonance inductor; A pick-up coil part including a pick-up coil magnetically coupled to the car side; A first resonator including a first capacitor and having one end coupled to a pickup coil part in series to form a first resonance current; A second resonator including a second capacitor and coupled in parallel with the pickup coil to form a second resonant current; And a rectification section including a first output terminal and a second output terminal connected to the load and rectifying a first resonance current from the other end of the first resonance section to supply an output voltage to the load, And a capacitance of the first capacitor and the capacitance of the second capacitor.

According to another aspect of the present invention, there is provided a magnetic induction pickup device for receiving AC power transmitted in a self-induction manner from a primary side, the device including a resonance inductor, A pick-up coil part including a pick-up coil magnetically coupled to the car side; A first resonator including a first capacitor and having one end coupled to a pickup coil part in series to form a first resonance current; A second resonator comprising a second capacitor and selectively forming a second resonant current in parallel or in series with the pickup coil part; And a rectification section including a first output terminal and a second output terminal connected to the load and rectifying a first resonance current from the other end of the first resonance section to supply an output voltage to the load, And a second resonance part is variable in accordance with a duty ratio of selectively resonating in parallel with the pick-up coil part or a ratio of a capacitance of the first capacitor and a capacitance of the second capacitor.

The magnetic induction pickup device according to another embodiment of the present invention is characterized in that the second resonance section includes first and second switch elements connected in series between a first output terminal and a second output terminal of the rectifying section, Wherein the first node and the second node are electrically connected between a first node to which the pickup coil part and one end of the first resonance part are connected and a second node to which the first and second switch elements are connected, It is preferable that the duty ratio of the second switch element is controlled to be variable.

The magnetic induction pickup device according to another embodiment of the present invention is characterized in that the first and second switch elements are alternately turned on at every zero crossing point at which the AC power changes from negative to positive or from positive to negative, It is preferable that the zero crossing point is included.

It is preferable that the ratio of the capacitances of the first capacitor and the second capacitor is varied, and the sum of the capacitances of the first capacitor and the second capacitor is preferably constant, in the magnetic induction-pickup device according to an embodiment of the present invention and another embodiment Do.

It is preferable that the resonance inductor of the magnetic induction-pickup device according to the embodiment and the other embodiment of the present invention is a leakage inductor caused by leakage flux of the pickup coil part.

INDUSTRIAL APPLICABILITY The magnetic induction-pickup device according to the present invention can reduce the current stress of the switching element by effectively dividing the resonance current of the capacitor resonating in series with the pickup coil and adjusting the resonance current thereof, There is a regulating effect.

1 and 2 are circuit diagrams of a magnetic induction pickup device according to the prior art.
3 is a circuit diagram of a magnetic induction pickup device according to an embodiment of the present invention;
4 is a simulation circuit diagram of the magnetic induction pickup device shown in Fig.
5 is a graph showing simulation results of the simulation circuit of FIG.
6 is a circuit diagram of a magnetic induction pickup device according to another embodiment of the present invention.
Fig. 7 is an operational waveform diagram at the time of soft switching of the magnetic induction pickup device shown in Fig. 6; Fig.
8 (a) to 8 (f) are electric current flow charts of the operation mode of the magnetic induction-pickup device shown in Fig.
Fig. 9 is an operational waveform chart at the time of hard switching of the magnetic induction-pickup device shown in Fig. 6; Fig.
10 is a simulation circuit diagram of the magnetic induction pickup device shown in Fig.
11 is a graph showing simulation results of the simulation circuit of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following detailed description is merely exemplary and is merely illustrative of preferred embodiments of the present invention.

3 is a circuit diagram showing a circuit configuration of a magnetic induction pickup device according to an embodiment of the present invention.

3, a magnetic induction pickup device according to an embodiment of the present invention includes a pickup coil part 100 including a resonance inductor Lr and a pickup coil L 2 magnetically coupled to the primary side, A first resonator part 200 including a first capacitor C1 and one end connected in series to the pickup coil part 100 to form a first resonance current Ic1; And a second resonator 300 connected in parallel with the pickup coil part 100 to form a second resonant current Ic2 and a second resonator 300 connected to the first output terminal 410 and the second output terminal And a rectifying unit 400 including a first resonance unit 400 and a second resonance unit 420 and rectifying a first resonance current Ic1 from the other end of the first resonance unit 200 to supply an output voltage to the load 600, Is varied according to the ratio of the capacitances of the first capacitor (C1) and the second capacitor (C2).

The pick-up coil part 100 is constituted by magnetically coupling with the primary side to generate a voltage and a current. The pick-up coil L2 is magnetically coupled to the primary side, and the pickup coil L2 magnetically coupled with the primary side. And a resonance inductor Lr that does not resonate. The resonance inductor Lr conducts parallel resonance with the second resonance unit 300 at the rear end or resonates in series with the first resonance unit 200 at the rear end to transmit the generated resonance current to the load 600 side. The resonant inductor Lr may be a leakage inductor due to a leakage magnetic flux that is not magnetically coupled to the primary side. The pick-up coil part 100 may further include a second resonant inductor (not shown) connected in series to the leakage inductor if the resonant inductor Lr is a leakage inductor.

The first resonator unit 200 is coupled in series to the pickup coil unit 100 to form a first resonance current Ic1. The first resonator unit 200 includes a first capacitor C1 and the capacitance of the first capacitor C1 may be varied in conjunction with the second capacitor C2 of the second resonator unit 300. [ Although not shown in the drawing, the first capacitor C1 of the first resonator unit 200 may be implemented as a capacitor bank as an example of a variable capacitor. The capacitor bank may be composed of a plurality of capacitors and a plurality of switch elements connected in series to each of the plurality of capacitors, and the capacitance is varied by the turn-on combination of the switch elements.

The second resonator unit 300 is coupled in parallel to the pickup coil unit 100 to form a second resonance current Ic2 in every cycle of the AC power source on the primary side. The second resonator 300 also includes a second capacitor C2 whose capacitance is variable in conjunction with the first capacitor C1, similar to the first resonator 200. [ At this time, the ratio of the capacitances of the first capacitor C1 and the second capacitor C2 is varied, and the sum of the capacitances of the first capacitor C1 and the second capacitor C2 is kept constant. When the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 is fixed and the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 is constant, the first resonator 200 generates the first resonant current Ic1 by the load 600, The resonance frequency is maintained constant in the section for transmitting the resonance frequency.

The second resonator 300 resonates with the pick-up coil part 100 at the starting point of the positive half period and the negative half period of the primary side AC power to form the second resonant current Ic2. A part of the formed second resonance current Ic2 is a part of the first resonance current Ic2 when the rectification part 400 is conducted and the pickup coil part 100 and the first resonance part 200 are serially resonated to form the first resonance current Ic1 Contributes to the magnitude of the resonance current Ic1. The first resonance current Ic1 formed by the pickup coil part 100 and the first resonance part 200 is transmitted to the load 600 via the rectification part 400. [ The second resonance current Ic2 can be adjusted by varying the second capacitor C2 of the second resonance part 300 so that when the first resonance current Ic1 is formed, It is possible to control the voltage or current to be transferred to the load 600 by varying the size. In general, when the capacitance of the second capacitor C2 is larger than that of the first capacitor C1, the output voltage and the output current appearing at the first and second output ends 410 and 420 of the rectifying part 400 increase, The output voltage and the output current appearing at the first and second output terminals 410 and 420 of the rectifier section 400 decrease when the capacitance of the capacitor C2 becomes smaller than that of the first capacitor C1.

4 is a circuit diagram for a simulation to verify the operation and effect of the magnetic induction-pickup device according to an embodiment of the present invention. FIG. 5 shows a simulation result of the simulation circuit diagram of FIG. Respectively.

A magnetic induction pickup device according to an embodiment of the present invention is shown in a dotted box in Fig. In the simulation circuit diagram, the resonance inductor Lr is set to 6.8472 mH, and the capacitances of the second resonator unit C2 and the first resonator unit C1 are 37.4 * Kc [nF] and 37.4 * (1-Kc) nF]. The capacitance of the second resonating part C2 is varied in proportion to the proportional coefficient Kc while the sum of the capacitances of the second resonating part C2 and the first resonating part C1 is set to 37.4 nF.

From the simulation results of FIG. 5, it can be seen that the output voltage Vout varies linearly with Kc in the above setting. As shown in the graph of FIG. 5, in order to linearly control the output voltage Vout according to the change of the proportional coefficient Kc, the proportional coefficient Kc preferably falls within a range of 0? Kc? 0.5. In other words, it is preferable that the capacitance C2 of the second resonating part C2 is in the range of 0? C2? C1 with respect to the capacitance C1 of the first resonating part C1.

Up device that receives electric power by magnetic induction from the AC power source of the primary side needs to output the output voltage or current in order to transmit a constant power to the load despite the change of coupling coefficient or output load between the primary side and the pickup coil Regulation is required. However, as described above, the magnetic induction-pickup device according to an embodiment of the present invention varies the ratio of the resonant inductor to the parallel or series resonant capacitor to switch the resonant current transmitted to the load, So that the output voltage Vout can be varied.

6 is a circuit diagram of a magnetic induction pickup device according to another embodiment of the present invention.

6, a magnetic pickup device according to another embodiment of the present invention includes a pickup coil part 100 including a resonance inductor Lr and a pickup coil L 2 magnetically coupled to the primary side, A first resonator part 200 including a first capacitor C1 and one end connected in series to the pickup coil part 100 to form a first resonance current Ic1; A second resonator 300 including a first resonator 300 and a second resonator 300 to form a second resonant current Ic2 in parallel or in series with the pickup coil 100, And a rectifying unit 400 including a second output stage 420 and rectifying a first resonance current Ic1 from the other end of the first resonance unit 200 to supply an output voltage to the load 600, The output voltage may be a duty ratio at which the second resonator 300 selectively resonates in parallel with the pick-up coil part 100, or the duty ratio of the first and second capacitors C1, And the capacitance of the capacitor C2.

The pick-up coil part 100 is constituted by magnetically coupling with the primary side to generate a voltage and a current. The pick-up coil L2 is magnetically coupled to the primary side, and the pickup coil L2 magnetically coupled with the primary side. And a resonance inductor Lr that does not resonate. Similar to the magnetic induction-pickup device according to an embodiment of the present invention shown in Fig. 3, the resonant inductor Lr may be a leakage inductor due to a leakage magnetic flux not magnetically coupled to the primary side. The pick-up coil part 100 may further include a second resonant inductor (not shown) connected in series to the leakage inductor if the resonant inductor Lr is a leakage inductor.

3, the second resonator unit 300 according to another embodiment of the present invention includes a second capacitor C2, which is different from the magnetic induction pickup apparatus according to the first embodiment of the present invention, Connected in series between the first output terminal 410 and the second output terminal 420 of the rectifier section 400 so as to form a second resonant current Ic2 by selectively parallel or series coupling with the coil section 100, 2 switch elements M1 and M2. Parallel diodes (not shown) connected between the drain and source terminals of the first and second switch elements M1 and M2 may be parasitic diodes of the first and second switch elements M1 and M2, And may be a diode added to the outside additionally. One end of the second capacitor C2 of the second resonator 300 is connected to the common connection point of the first and second switch elements M1 and M2 to turn on and off the first and second switch elements M1 and M2. And is electrically connected to the first output terminal 410 or the second output terminal 420 according to the operation. The second resonance current Ic2 increases when the first switch element M1 or the second switch element M2 is turned on and the second resonance portion 300 resonates in parallel with the pickup coil portion 100. [ Thereafter, when the first switch element M 1 or the second switch element M 2 turned on is turned off, the second resonance part 300 is resonated in series between the pickup coil part 100 and the load 600 The second resonance current Ic2 generated during the parallel resonance is transmitted to the load 600 side. In this case, the second resonance current Ic2 increases as the capacitance of the second capacitor C2 or the duty ratio of the first and second switch elements M1 and M2 increases, and the capacitance of the second capacitor C2 Since the duty ratio of the first and second switch elements M 1 and M 2 decreases as the duty ratio decreases, the output voltage or current can be regulated by using the same.

The output voltage or current is controlled by changing the duty ratio of the first and second switch elements M1 and M2 as well as by changing the duty ratio of the first resonance part 200 and the second resonance part 300, By adjusting the ratio of the capacitances of the transistors. At this time, it is preferable that the ratio of the capacitances of the first capacitor C1 and the second capacitor C2 is variable, but the sum of the capacitances of the first capacitor C1 and the second capacitor C2 is kept constant.

7 shows an operation waveform when the magnetic induction-pickup device according to another embodiment of the present invention shown in Fig. 6 performs soft switching, and Figs. 8 (a) to 8 6 is a current flow chart for each mode of operation of the magnetic induction pickup device of Fig. 6, which is divided according to the section. In FIG. 7, the first and second switch devices M1 and M2 are alternately turned on at a zero crossing point where the primary AC power, that is, the voltage or the current, changes from negative to positive or from positive to negative, Time. In this operating condition, the first and second switch elements M1 and M2 can perform soft switching at zero voltage.

7, the magnetic induction-pickup device according to another embodiment of the present invention includes five operation modes (modes 1 to 5) in a half cycle of the AC power induced in the secondary-side pick-up coil L2, And mode 6 indicates the operation mode in the negative half period. Since the operation mode at the negative half period is opposite to the operation mode at the positive half period and the polarity of the voltage and the current, the remaining characteristics are the same, and only the operation mode will be described below in the positive half cycle of the AC power.

Hereinafter, the operation of the magnetic induction-pickup device according to another embodiment of the present invention will be described for each operation mode using Figs. 7 and 8 (a) to 8 (f). 8 (a) to 8 (f), the voltage between the other end of the first capacitor C1 and the other end of the pickup coil part 100 is set to the first voltage V1, The voltage between the other end of the second capacitor C2 and the other end of the pickup coil part 100 will be referred to as a second voltage V2.

Mode 1: As shown in FIG. 8 (a), in this mode, the pick-up coil part 100 and the second resonator 300 resonate in parallel to form a resonance current I _Lr . At this time, the path of the resonance current I _Lr is the path of the resonance current I _Lr between the second diode D2 of the pickup coil L2, the resonance inductor Lr, the second capacitor C2, the second switch element M2, So that the resonance current I _Lr is equal to the second resonance current Ic2 and the first resonance current Ic1 does not flow through the first capacitor C1 of the first resonance portion 200. [ The second voltage V2 is 0V because the second switch element M2 is turned on in this interval. However, since the second capacitor C2 is charged by the second resonance current Ic2, Lt; / RTI >

Mode 2: The path of the current in this mode is as shown in Fig. 8 (b). The third diode D3 of the rectifying section 400 conducts and the resonance current I flowing only to the second resonance section 300 becomes zero when the first voltage V1 rising in mode 1 becomes equal to the output voltage of the rectifying section 400. [ to a part of _Lr) branch begins to flow, the first resonant current (Ic1) to the first resonating part 200. At this time, the ratio of the resonance current I _Lr flowing through the resonance inductor Lr to the first resonance current Ic1 and the second resonance current Ic2 is the ratio between the first capacitor C1 and the second capacitor C2, Is set by the capacitance ratio of the capacitor.

Mode 3: This mode is started when the second switch element M2 turned on is turned off. The second resonant current Ic2 flowing to the second capacitor C2 flows to the first capacitor C1 so that the first resonant current Ic1 flows through the resonant inductor Lr, Is equal to the resonance current of the resonator. 8C, the first resonance current Ic1 in this mode is the same as that of the third diode of the pickup coil L2 - the resonant inductor Lr - the first capacitor C1 - (D3) to the path of the second diode (D2). Since the first capacitor C1 is charged by the first resonance current Ic1 in this period, the second voltage V2 rises.

Mode 4: The path of the current in this mode is as shown in Fig. 8 (d). When the second voltage V2 rising in the mode 3 becomes equal to the output voltage on the side of the load 600, the antiparallel diode of the first switch element M1 becomes conductive and the resonance current of the resonance current flowing only to the first resonator 200 The second resonance current Ic2 starts to flow to the second resonance part 300. [ The diodes connected in anti-parallel to the first and second switch elements M1 and M2 may be parasitic diodes of the first and second switch elements M1 and M2 and may be diodes additionally externally added as necessary . At this time, the rate at which the resonance current I _Lr flowing through the resonance inductor Lr branches back to the first resonance current Ic1 and the second resonance current Ic2 is, as described above, Is determined by the ratio of the second capacitor (C2).

Mode 5: This mode is started when the first switching device M1 is turned on. Since the second resonance current Ic2 has already flowed through the antiparallel diode of the first switch element M1 in mode 4, the operation in which the first switch element M1 is turned on in the mode 5 is the first switch element M1 Quot; 0 ") is zero voltage, and so-called soft switching is achieved. As shown in the mode 5 section of FIG. 7, in order to achieve the soft switching, the first and second switch elements of the second resonator unit 300 are connected to each other at every zero crossing point at which the AC power changes from negative to positive, or from positive to negative, (M1, M2) alternately turn on, turn on before the zero crossing point and turn off after the zero crossing point. In mode 5, the first and second resonance currents Ic1 and Ic2 decrease and become zero current, and the AC power of the primary side is changed from positive to negative. The path of the current during this period is shown in FIG. 8 (e As shown in Fig.

Mode 6: This mode starts when the AC power of the primary side changes from positive to negative after the first and second resonance currents Ic1 and Ic2 decrease to zero current. The modes 1 to 5 described above are for the half period of the positive AC power induced in the secondary side pickup coil and the mode for the negative half period is from the mode 6. Thus, mode 6 in the negative half period corresponds to mode 1 in the positive half period. However, the operation mode in the negative half period is opposite to the operation mode in the positive half period and the polarity of the voltage and the current, and the remaining characteristics are the same. The path of the current during this section is as shown in Fig. 8 (f).

Fig. 9 shows an operation waveform when the magnetic induction pickup device according to another embodiment of the present invention shown in Fig. 6 is subjected to a hard switching operation.

As described above, in order to achieve the soft switching in FIG. 7, the first and second switch elements Ml, Ml of the second resonance part 300 are connected to each other at every zero crossing point at which the AC power changes from negative to positive or from positive to negative, M2 are turned on alternately and the section in which the first or second switch element M1 or M2 is turned on must include the zero crossing point. However, in the case where the section for turning on the first or second switch element M1 or M2 does not include the zero crossing point, the first or second switch element M1 or M2 may be switched by the hard switching .

9, the first and second switch devices M1 and M2 are switched in the dotted line area in FIG. 9, but unlike the soft switching in FIG. 7, Quot; does not include a zero-crossing point, and so-called hard switching is performed. Actually, when the first and second switch elements M1 and M2 are switched, the current flowing through the first and second switch elements M1 and M2 is not 0A at the moment of switching, The voltage across both terminals M1 and M2 is not 0V.

7, in order to soft-switch the first and second switch devices M1 and M2 included in the second resonator 300 in the magnetic induction-pickup device according to another embodiment of the present invention, The zero cross point at which the AC power changes from negative to positive or from positive to negative is included in a period in which the first or second switch device M1 or M2 is turned on It is necessary to control the control signals G1 and G2.

10 is a circuit diagram for a simulation to verify the operation and effect of the magnetic induction-pickup device according to another embodiment of the present invention. FIG. 11 shows a simulation result of the simulation circuit diagram of FIG. 10, Respectively.

The magnetic induction pickup device according to another embodiment of the present invention is shown in a dotted box in Fig. In the simulation circuit diagram, the resonance inductor Lr is set to 6.8472 mH, and the capacitances of the second resonator unit C2 and the first resonator unit C1 are 37.4 * Kc [nF] and 37.4 * (1-Kc) nF]. The capacitance of the second resonating part C2 is varied in proportion to the proportional coefficient Kc while the sum of the capacitances of the second resonating part C2 and the first resonating part C1 is set to a constant value of 37.4 nF.

The circuit shown in Fig. 10 is a circuit in which the capacitance ratio of the first resonant portion C1 and the second resonant portion C2 and the change in capacitance ratio of the first and second switch elements M1 and M2 A simulation was performed to confirm the change of the output voltage (Vout) according to the duty ratio. 11, the magnetic induction-pickup device according to another embodiment of the present invention basically has an output voltage Vout that increases as the duty ratio of the first and second switch elements M1 and M2 increases And the output voltage Vout is increased by increasing the capacitance ratio of the second resonant portion C2 with respect to the first resonant portion C1 even within the same duty ratio.

Up device that receives electric power by magnetic induction from the AC power source of the primary side needs to output the output voltage or current in order to transmit a constant power to the load despite the change of coupling coefficient or output load between the primary side and the pickup coil However, the magnetic induction-pickup device according to the present invention needs to be regulated. The magnetic induction-pickup device according to the present invention controls the amount of the capacitor in parallel or series resonance with the resonance inductor, or by controlling the duty ratio of the switching element by shunting the resonance current, The output voltage Vout or the output current can be efficiently controlled. Consequently, the magnetic induction-pickup device of the present invention not only reduces the current stress of the switching element by shunting the resonance current of the capacitor that resonates in series with the pickup coil, and adjusts the resonance current thereof, There is an advantage that it can be effectively regulated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: pick-up coil part 200: first resonance part
300: second resonance part 400: rectification part
410, 420: first output terminal, second output terminal 600: load
Ic1: first resonance current Ic2: second resonance current
M1: first switch element M2: second switch element

Claims

A magnetic induction pickup device for receiving AC power transmitted from a primary side in a magnetic induction manner,
A pickup coil part including a resonance inductor and a pickup coil magnetically coupled with the primary side;
A first resonator including a first capacitor and having one end coupled to a pickup coil part in series to form a first resonance current;
A second resonator including a second capacitor and coupled in parallel with the pickup coil to form a second resonant current; And
And a rectifying unit including a first output terminal connected to the load and a second output terminal and rectifying a first resonance current from the other end of the first resonance unit to supply an output voltage to the load,
Wherein the output voltage varies according to a ratio of capacitances of the first capacitor and the second capacitor,
Wherein the resonance inductor is a leakage inductor due to leakage magnetic flux of the pickup coil part.

A magnetic induction pickup device for receiving AC power transmitted from a primary side in a magnetic induction manner,
A pickup coil part including a resonance inductor and a pickup coil magnetically coupled with the primary side;
A first resonator including a first capacitor and having one end coupled to a pickup coil part in series to form a first resonance current;
A second resonator comprising a second capacitor and selectively forming a second resonant current in parallel or in series with the pickup coil part; And
And a rectifying unit including a first output terminal connected to the load and a second output terminal and rectifying a first resonance current from the other end of the first resonance unit to supply an output voltage to the load,
Wherein the output voltage is variable according to a duty ratio in which the second resonance part selectively resonates in parallel with the pickup coil part or a ratio of a capacitance of the first capacitor and a capacitance of the second capacitor.

3. The method of claim 2,
The second resonator may include first and second switch elements connected in series between a first output terminal and a second output terminal of the rectifying section,
The second capacitor electrically connects between a first node connected to one end of the pickup coil part and the first resonator part and a second node connected to the first and second switch elements,
Wherein the output voltage is variable by controlling a duty ratio of the first and second switch elements.

The method of claim 3,
Wherein the first and second switch elements are alternately turned on at each of the zero cross points at which the second capacitor current changes from positive to positive or from positive to negative, and the turn-on period includes the zero cross point. Inductive pickup device.

3. The method according to claim 1 or 2,
Wherein a ratio of capacitances of the first capacitor and the second capacitor is varied, and a sum of capacitances of the first capacitor and the second capacitor is constant.

3. The method of claim 2,
Wherein the resonance inductor is a leakage inductor due to leakage magnetic flux of the pickup coil part.