JPH10215531A - Charging system for motored vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate charging work of battery by charging a power supply, i.e., a battery, for a motor which is mounted on a motor vehicle through a charger, thereby eliminating the need for a user to connect a charging cord every time, when the battery is charged. SOLUTION: Advancing direction of a bicycle is set in a longitudinal direction of a positioning groove 23 with a rear wheel 7 being mounted on the positioning groove 23. A single leg type supporting stand 6 in horizontal state is then turned forward from the rear and brought into an upright state. Subsequently, a secondary coil unit 32, provided at the grounding part 6a of the supporting stand 6, is fitted in a recess 26 of a stand-receiving member 25 for establishing a magnetic circuit along with a primary coil unit 27 provided in the stand receiving member 25, thus coupling the primary and secondary coils magnetically. A charger 20 is connected with a bicycle body 1 under that state, thus charging a battery. This arrangement facilitates charging work of a battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging system for charging a battery mounted on an electric vehicle such as a bicycle with an electric motor.

[0002]

2. Description of the Related Art In recent years, bicycles equipped with an electric motor for assisting a human-driven driving force by mounting an electric motor on a bicycle body that can be driven manually are being developed.

FIG. 7 shows a schematic configuration of a bicycle with an electric motor. Torque generated by depressing a pedal of a bicycle body 1 is detected by a torque sensor 2.
The detection signal is input to the controller 3. In response, the controller 3 creates a torque command corresponding to the input detected torque signal and supplies the torque command to the electric motor 4. As a result, in addition to the manual torque,
A motor output torque having a magnitude corresponding to the human torque value is supplied, and the driving force by human power is assisted.

A battery 5 serving as a power source for the electric motor 4 is mounted on the bicycle body 1. When the output voltage of the battery 5 decreases, the battery 5 is removed from the bicycle body 1 and charged by a dedicated charging device. Has been given.

[0005] However, in the conventional charging method, the battery 5 is brought into a room such as a house and charged using a dedicated charging device, and there is a problem that it takes much time and effort.

For this reason, recently, Japanese Patent Application Laid-Open No. 5-31660
Japanese Patent Application Laid-open No. 6-2006 proposes a system in which a charging terminal device is installed in a bicycle parking lot, and the charging terminal device is connected to a battery mounted on a bicycle by a charging cord to perform charging.

[0007]

However, even in the above-described charging system, the user needs to connect the charging cord to the charging terminal device and the battery every time charging is performed, and the charging operation is troublesome. Still had the drawback.

In addition, the charging system has a problem that charging can be performed only in a specific bicycle parking area where a large-sized charging terminal device is installed. The present invention has been made in view of the above-described circumstances, and allows a user to easily perform a battery charging operation without performing a connection operation using a charging cord every time charging is performed. An object of the present invention is to provide a charging system for an electric vehicle that can perform a charging operation even in a place other than a specific place where a charging terminal device is installed.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a charging apparatus provided with an output means for converting a charging current into magnetic energy or radio wave energy and outputting the converted energy, and a magnetic energy or radio wave energy from the charging apparatus. Input means for receiving and converting the high-frequency current into a high-frequency charging current, a smoothing means provided in proximity to the input means for smoothing the high-frequency current, and a current path for supplying a current passing through the smoothing means to the battery And an electric vehicle provided with
A battery serving as a power source of an electric motor mounted on an electric vehicle is charged by a charging device.

[0010] By using this configuration, the user can simply perform the charging operation of the battery without moving the charging device and the electric vehicle in an electrically non-contact state only by moving the electric vehicle to a predetermined position. it can. Also, no high-frequency current flows in the current path to the battery.

As a specific configuration, the output means includes switching means for switching a charging current to generate a high-frequency pulse current, and a primary coil to which the pulse current generated by the switching means is supplied. The input means is constituted by a secondary coil to be electromagnetically coupled to the primary coil.

With this configuration, electric power is supplied to the secondary coil by the electromagnetic induction, and the battery is charged with the electric power. The input means and the smoothing means are provided on a support stand of the electric vehicle.

With this configuration, the charging current is supplied to the battery via the support stand only by the electric vehicle parking the electric vehicle in the charging device. Further, the charging device includes a recess into which the support stand fits, and forms a primary coil device having the primary coil near the recess.
The electric vehicle forms a secondary coil device having the secondary coil on a support stand, a primary coil device is formed in a U shape so as to surround the concave portion, and the secondary coil device is connected to a ground portion of the support stand. Is formed.

By using this configuration, the battery is charged simply by engaging the support stand with the recess of the charging device. Further, the smoothing means may be constituted by an inductance element and a capacitor.

With this configuration, the high-frequency charging current can be reliably smoothed, and the generation of electromagnetic noise can be suppressed. More specifically, the electric vehicle includes an electric bicycle.

With this configuration, the charging operation of the battery mounted on the bicycle main body can be easily performed in an electrically non-contact state.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the electric vehicle of the present invention is applied to a bicycle with an electric motor shown in FIG. 7 will be specifically described below with reference to the drawings.

FIG. 1 is a schematic structural view of a bicycle with an electric motor of the present invention, FIG. 2 is an external perspective view of a charging device 20 of the present invention, and FIG. 3 is a primary coil device 27 and a secondary coil device of FIG. FIG. 3 is an explanatory diagram showing a configuration of No. 32. The same components as those of the above-described conventional configuration (see FIG. 7) are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 6 denotes a one-legged support stand provided on the rear wheel 7 side of the bicycle body 1, and a tip portion of the support stand 6, that is, a portion (ground contact portion) 6 on the side in contact with the ground.
In a, a secondary coil 31 to be electromagnetically coupled to a primary coil 22 of the charging device 20 described later is provided therein. Here, the primary coil 22 constitutes an output section (output means) of the charging primary circuit 21 of the charging device 20, and the secondary coil 31 constitutes an input section (input means) of a charging secondary circuit 30 described later. I have.

Then, by supplying a charging current to the primary coil 22 of the charging device 20, a charging current flows through the secondary coil 31 by an electromagnetic induction action, and the charging current is supplied to the battery 5 to be charged.

Next, the configuration of the charging device 20 and the charging device 2
A connection state between the bicycle body 1 and the bicycle body 1 will be described. As shown in FIG. 2, the charging device 20 includes a base 24 in which a positioning groove 23 of the rear wheel 7 of the bicycle body 1 is recessed.
A stand receiving member 25 is provided on 4. The stand receiving member 25 is formed with a concave portion 26 to be engaged with the grounding portion 6a of the support stand 6 supporting the bicycle main body 1, surrounds the concave portion 26, and embeds a primary coil device 27. Other circuit elements to be included in the circuit 21 are included. A power cord 28 to be connected to a commercial power outlet extends from the base 24.

As shown in FIG. 3, a U-shaped primary coil device 27 is arranged inside the stand receiving member 25 so as to surround the concave portion 26. It is composed of a U-shaped iron core 29 and a primary coil 22.

On the other hand, a secondary coil device 32 is built in the grounding portion 6a of the support stand 6 of the bicycle body 1,
The secondary coil device 32 includes an iron core 33 and a secondary coil 31.
It is composed of The leg 6 of the support stand 6 is connected to the secondary coil device 32 via rectifiers 34 and 35.
The line (current path) is connected to an inductance element 36 and a capacitor 37 as smoothing means to be described later, which are built in b and stretched along the frame of the bicycle main body 1.
It is connected to the battery 5 via 38 and forms a charging secondary circuit 30 described later together with other circuit elements interposed in the line.

Next, a case where the battery 5 of the bicycle body 1 is charged will be described. Here, FIGS. 4 and 5 are a top view and a side view, respectively, showing a state in which the battery 5 of the bicycle body 1 is charged using the charging device 20.

As shown in the figure, when charging the battery 5 mounted on the bicycle main body 1, the traveling direction of the bicycle is directed in the longitudinal direction of the positioning groove 23, and the rear wheel 7 is placed on the positioning groove 23. The one-leg type support stand 6 which is placed on a horizontal position is rotated from the rear to the front to be in an upright state, and is engaged in the recess 26 provided in the stand receiving member 25.

Thus, the grounding portion 6a of the support stand 6
The secondary coil device 32 provided in the stand engages with the concave portion 26 of the stand receiving member 25, and a magnetic circuit is formed by the primary coil device 27 provided in the stand receiving member 25. The coil 31 and the coil 31 are electromagnetically coupled to each other.

Next, the charging operation of the battery 5 in the state where the bicycle body 1 is connected to the charging device 20 will be described with reference to a circuit block diagram shown in FIG.
As shown in FIG. 6, the charging primary circuit 21 includes a commercial power supply 61,
The circuit is composed of a rectifier 62, a smoothing capacitor 63, a primary coil 22, and a switching circuit 64,
The switching circuit 64 is driven by a drive signal D supplied from the drive circuit 65. Here, the switching frequency of the switching circuit 64 is 100 kHz.
Is set to The primary coil 22 and the switching circuit 64 constitute an output section (output means) of the charging primary circuit 21.

On the other hand, the charging secondary circuit 30 includes a secondary coil 3
1, the rectifiers 34 and 35, the inductance element 36, the capacitor 37, and the battery 5 constitute a circuit, and the inductance element 36 and the capacitor 37 constitute an LC filter smoothing means 71. Specifically, 400 μH is used as the inductance element 36 and 60 μF is used as the capacitor 37 so that the cutoff frequency of the LC filter of the smoothing means 71 is 1 kHz. As a result, a fundamental wave of 100 kHz is used. About 24 dB.

Since the smoothing means 71 is provided close to the secondary coil device 23, generation of electromagnetic noise due to high-frequency current in the current path 38 provided between the support stand 6 and the battery 5 Will be greatly reduced.

When charging the battery 5 with this configuration, the AC voltage obtained from the commercial power supply 61 passes through the rectifier 62 and the smoothing capacitor 63, and passes through the primary coil 22.
Has been added to Then, the switching circuit 64 is switched at a switching frequency of 100 kHz by the drive signal D supplied from the drive circuit 65. As a result, the current supplied to the primary coil 22 is switched in synchronization with the ON / OFF of the drive signal D,
As a result, the lines of magnetic force generated from the primary coil 22 change, and the lines of magnetic force pass through the secondary coil 31, so that the primary coil 22 and the secondary coil 31 are electromagnetically coupled to each other.

A high-frequency pulse current is obtained from the secondary coil 31 by this electromagnetic coupling. The pulse current is rectified by the rectifiers 34 and 35, and the rectified current has a pulse waveform. However, the current is converted into a current with little fluctuation by the smoothing action of the inductance element 36 and the capacitor 37. Thus, the current path 38 to the battery 5
In this case, the high-frequency current does not flow, and the battery 5 can be charged without generating electromagnetic wave noise.

The description of the above embodiment is for the purpose of describing the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. Also, the configuration of each part of the present invention is not limited to the above-described embodiment,
It goes without saying that various modifications are possible within the technical scope described in the claims.

For example, in the description of the above embodiment, the case where the inductance element 36 and the capacitor 37 are used as the smoothing means 71 has been described. Alternatively, only the inductance element 36 may be used.

[0034]

As described above, according to the present invention, the user simply moves the electric vehicle to a predetermined position, and the charging device and the electric vehicle are in a non-contact state. Work can be performed, and no high-frequency current flows in the current supply line to the battery, so that there is no possibility that electromagnetic noise will occur during charging.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a bicycle with an electric motor according to the present invention.

FIG. 2 is an external perspective view of the charging device 20 of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of a primary coil device 27 and a secondary coil device 32 of the device in FIG. 2;

FIG. 4 is a partially cutaway top view showing a charging state by the charging system of the present invention.

FIG. 5 is a partially cutaway side view showing a charging state by the charging system of the present invention.

FIG. 6 is a circuit block diagram illustrating a circuit configuration of the charging system of the present invention.

FIG. 7 is a schematic sectional view of a conventional bicycle with an electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bicycle main body 5 Battery 6 Support stand 7 Rear wheel 20 Charging device 21 Charging primary circuit 22 Primary coil 30 Charging secondary circuit 31 Secondary coil 36 Inductance element 37 Capacitor 38 Current path 64 Switching circuit 65 Drive circuit 71 Smoothing means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02M 3/28 H02M 3/28 Y

Claims (7)

[Claims] 1. A system for charging a battery serving as a power source of an electric motor mounted on an electric vehicle by a charging device, the charging device converting the charging current into magnetic energy or radio wave energy and outputting the converted energy. The electric vehicle is provided with an input means for receiving magnetic energy or radio wave energy from the charging device and converting it into a high-frequency charging current, and provided near the input means to output the high-frequency current. A charging system for an electric vehicle, comprising: a smoothing unit to be smoothed; and a current path for supplying a current passing through the smoothing unit to a battery. 2. The output means comprises: switching means for switching a charging current to generate a high-frequency pulse current; and a primary coil to which the pulse current generated by the switching means is supplied. The charging system for an electric vehicle according to claim 1, wherein the charging system is configured by a secondary coil to be electromagnetically coupled to the primary coil. 3. The electric vehicle charging system according to claim 2, wherein the input means and the smoothing means are provided on a support stand of the electric vehicle. 4. The charging device has a concave portion into which the support stand fits, and forms a primary coil device having the primary coil near the concave portion, and the electric vehicle has a secondary coil having the secondary coil on the support stand. The charging system for an electric vehicle according to claim 3, wherein a secondary coil device is formed. 5. The apparatus according to claim 4, wherein said primary coil device is formed in a U-shape so as to surround said recess, and said secondary coil device is formed in a ground portion of a support stand.
3. The charging system for an electric vehicle according to claim 1. 6. The electric vehicle charging system according to claim 1, wherein said smoothing means comprises an inductance element and a capacitor. 7. The electric vehicle charging system according to claim 1, wherein the electric vehicle is an electric bicycle.