CN108448743B - Consumer Electronics Wireless Power Receiving Devices - Google Patents

L, R shows the length and cross section radius of the

4 of the magnetic concentration low loss receiving coil iron core, ρ is the calculation bin on the circular surface with radius R, and θ is the positive included angle between the bin ρ and the x axis. To calculate without loss of generality, P is selected as a calculation field point, and due to the symmetry of the iron core structure, the P point is located on a yz plane and has coordinates of P (0, y)₁,z₁). To facilitate analysis of the characteristics of the loss parameters, let

Then the axial loss parameter and the radial loss parameter of the

4 of the iron core of the magnetic aggregation low-loss receiving coil are respectively as follows:

Order to

The following can be obtained: the loss parameter perpendicular to the axial direction of each point on the middle cross section and the axis of the thin-

4 of the iron core of the magnetic gathering low-loss receiving coil is zero, namely

The axial loss parameters of each point on the axis of the

4 of the magnetic gathering low-loss receiving coil iron core are as follows:

the length L of the thin-

4 of the iron core of the magnetic aggregation low-loss receiving coil is as follows:

as shown in FIG. 2, in order to minimize the axial loss parameters of all points on the axis of the thin-

4 of the iron core of the magnetic concentration low-loss receiving coil, z is satisfied₁When the number is equal to L,

F_zminthe length L of the magnetic concentration low-loss receiving coil iron core

4 can be obtained by the above formula (7) as the axial minimum loss parameter of each point on the axis of the magnetic concentration low-loss receiving coil iron core

4.

The cone angle of the

5 at the two ends of the iron core of the magnetic aggregation low-loss receiving coil

Number of layers of the

2

The total length of the

2

In the formula: r is₂The radius of the lower bottom surface of the circular

5 at the two ends of the iron core of the magnetic gathering low-loss receiving coil is equal to the radius of the lower bottom surface of the circular

5 at the two ends of the iron core of the magnetic gathering low-loss receiving coil; r, L are the cross section radius and length of the magnetic gathering low loss receiving coil iron core

4; n, d_wireThe number of turns and the wire diameter of the

2, respectively.

As shown in fig. 3, the present embodiment includes a function signal generator, a dc regulated power supply, a high frequency power amplifier, a transmitting coil compensating capacitor, a receiving coil compensating capacitor, an external load, a transmitting coil 1, a receiving

2, and a magnetic focusing low loss receiving

3. The signal generator, the direct current stabilized voltage power supply and the high-frequency power amplifier form an external power supply part; the transmitting coil 1 and the transmitting coil compensation capacitor form an electromagnetic transmitting part, and the resonant frequency of the transmitting coil 1 is matched with the central frequency of a power supply through the transmitting coil compensation capacitor; the magnetic focusing low-loss receiving

3, the receiving

2 and the receiving coil compensation capacitor form an electromagnetic receiving part, and the resonance frequency of the receiving

2 is matched with the central frequency of a power supply through the receiving coil compensation capacitor. The sine model emitted by the function signal generator is sent to a high-frequency power amplifier for amplification, the power amplifier signal output is connected with an electromagnetic transmitting part, an electromagnetic receiving part receives the energy in the transmitting coil 1 through coupling resonance, a

2 is connected with an external load, and the external load is connected with an oscilloscope. The DC stabilized voltage power supply provides bias voltage for the power amplifier.

transmitting coil 1 radius R₁Radius R of the receiving

2 of 5cm₂Axial minimum loss parameter F of each point on the axis of the 2cm magnetic concentration low-loss receiving coil iron core

4_zmin0.5, 20 turns N of the receiving

2, and the wire diameter d of the receiving

2_wire＝0.2cm。

(1) according to the radius R of the transmitting coil 1₁And determining the radius r of the lower bottom surfaces of the circular

5 at the two ends of the iron core of the magnetic concentration low-loss receiving coil according to the Gauss law of the magnetic field₂I.e. r₂＝R₁＝5cm；

(2) According to the radius R of a given receiving

2₂Determining the radius R of the cross section of a

4 of the iron core of the magnetic aggregation low-loss receiving coil and the radius R of the upper bottom surface of circular

5 at two ends of the iron core of the magnetic aggregation low-loss receiving coil₁I.e. R ═ R₁＝R₂＝2cm；

(3) According to the cross section radius R of the magnetic aggregation low-loss receiving coil iron core

4 and the axial minimum loss parameter F of each point on the axis of the magnetic aggregation low-loss receiving coil iron core

4_zminLet z₁L is calculated as: length L of core thin-

4 of magnetic focusing low-loss receiver coil, i.e.

(4) Determining the height of the circular

5 at two ends of the iron core of the magnetic aggregation low-loss receiving coil according to the length L of the

4 of the iron core of the magnetic aggregation low-loss receiving coil

(5) According to the radius r of the lower bottom surface of the circular

5 at two ends of the iron core of the magnetic gathering low-loss receiving coil₂The cross section radius R of the

4 of the iron core of the magnetic gathering low-loss receiving coil and the length L of the

4 of the iron core of the magnetic gathering low-loss receiving coil, and the cone angles alpha of the circular

5 at the two ends of the iron core of the magnetic gathering low-loss receiving coil are calculated according to the following formula, namely

(6) According to the cross section radius R of the magnetic concentration low-loss receiving coil iron core

4, the length L of the magnetic concentration low-loss receiving coil iron core

4, the number of turns N of the receiving

2 and the wire diameter d of the receiving

2_wireThe following are calculated respectively:

number of layers K of receiving

2_layer＝Nd_wire/L＝20×0.2/4＝1，

The bus length l of the receiving

2_wire＝2πNR+πN²d_wire/L＝2π×20×2+π×20²×0.2/4＝314cm。

the sinusoidal signal sent by the function signal generator is sent to a high-frequency power amplifier for amplification, the center frequency of the amplified sinusoidal signal is 8MHz, the amplitude is 14V, the power amplifier signal output is connected with an electromagnetic transmitting part, an electromagnetic receiving part receives energy in a transmitting coil 1 through coupling resonance, the resonance frequency of the transmitting coil 1 and the resonance frequency of a receiving

2 are 8MHz through tuning, the receiving

2 is connected with an external load, and the external load is connected with an oscilloscope. The DC stabilized voltage power supply provides bias voltage for the power amplifier.

As shown in fig. 3, the transmitting coil 1 and the receiving

2 are solenoid coils formed by winding copper wires with a wire diameter of 0.2 cm. The transmitting coil 1 has 10 turns, a radius R of 5cm and a turn pitch of 0.5 mm.

As shown in fig. 6, the radius r of the lower bottom surface of the

5 at the two ends of the magnetic concentration low-loss receiving coil core is₂The length L and the cross section radius R of a

4 of the magnetic gathering low-loss receiving coil iron core are respectively 4cm and 2cm, the height h of circular

5 at two ends of the magnetic gathering low-loss receiving coil iron core is 1cm, and the degree of half of the cone angle alpha, namely alpha/2, of the circular

5 at two ends of the magnetic gathering low-loss receiving coil iron core is 71.5 degrees.

1. A wireless electric energy receiving arrangement of consumer electronic product, adopt the magnetic coupling resonant mode wireless electric energy to receive and dispatch the way, its electromagnetic receiving part includes receiving coil, receiving coil iron core, characterized by that, the said receiving coil iron core includes the thin axle cylinder of iron core and iron core both ends round platform located at its both ends; the receiving coil is tightly wound on the thin shaft cylinder of the receiving coil iron core; the height of the receiving coil is equal to the length L of the thin-axis cylinder of the iron core of the receiving coil; the radius R of the cross section of the thin-axis cylinder of the iron core of the receiving coil and the radius R of the receiving coil₂The same; the cone angles of the circular truncated cones at the two ends of the receiving coil iron core are defined as alpha; the height h of the circular truncated cones at the two ends of the receiving coil iron core is 1/4 of the length L of the thin-axis cylinder of the receiving coil iron core; the upper bottom surfaces of the round tables at the two ends of the iron core of the receiving coil are close to the thin shaft cylinder of the iron core, and the radius r of the lower bottom surface₂Radius R of the transmitter coil 1₁The same; radius of upper bottom surface r₁The radius of the cross section of the thin shaft cylinder is the same as that of the thin shaft cylinder of the coil core; the radius r of the lower bottom surface of the circular truncated cones at two ends of the receiving coil iron core₂Radius r of upper bottom surface of circular truncated cone at two ends of iron core of receiving coil₁，r₁The slope corresponding to half of the cone angle alpha of the truncated cones at the two ends of the iron core of the receiving coil, namely alpha/2, is linearly and uniformly changed to r₂(ii) a Setting the axial minimum loss parameter of each point on the thin-axis cylindrical axis of the iron core of the receiving coil as F_zmin，<F_zmin<1. The number of turns of the receiving coil is N and the wire diameter of the receiving coil is d_wireThe loss parameter of the thin-axis cylinder of the iron core of the magnetic gathering low-loss receiving coil can be measuredCalculating the length L of the thin-axis cylinder of the iron core of the receiving coil, wherein the derivation process is as follows:

wherein

the axial loss parameters of each point on the thin-axis cylindrical axis of the magnetic aggregation low-loss receiving coil iron core are as follows:

the length L of the thin-axis cylinder of the iron core of the magnetic aggregation low-loss receiving coil is as follows:

2. the radio energy receiving device of claim 1, wherein the cone angles of the truncated cones at the two ends of the core of the receiver coil are calculated as follows:

3. the device of claim 1, wherein the number of layers of receiving coils is K_layer＝Nd_wireL, bus length of receiving coil L_wire＝2πNR+πN²d_wire/L。