JPS6387136A - Charger for vehicle - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle charging device for charging an on-vehicle battery, and particularly to a charging device that does not require connection of a charging line and can perform charging operations simply and easily.

[Prior Art] In recent years, the number of electrical components in vehicles has continued to increase, and even when the vehicle is parked, the on-vehicle battery needs to supply standby current on the order of several tens of mA. For this reason, if the vehicle is left parked for a relatively long period of time, the battery may become discharged and the engine may not start smoothly.

[Problems to be Solved by the Invention] In such cases, the battery has conventionally been recharged using a charging device installed at a gas station, etc., but it is troublesome to connect the charging line to the battery, and the battery may not be completely discharged. Since there are many mild electrical discharges compared to the previous model, there is a strong desire to avoid the hassle of having to move the vehicle to a refueling station or the like each time.

The present invention aims to solve these problems,
An object of the present invention is to provide a vehicle charging device that can easily and conveniently charge a vehicle battery at home or the like.

[Means for Solving the Problems] To explain the configuration of the present invention with reference to FIG. 1, the vehicle charging device includes a power receiving electromagnetic coil 1 provided on the vehicle A, and a power receiving electromagnetic coil provided on the ground. a power transmitting electromagnetic coil 5 that directly faces and electromagnetically couples with the power transmitting electromagnetic coil 5; and a position detecting means 8 that detects a position where the power receiving electromagnetic coil 1 directly faces the power transmitting electromagnetic coil 5 and issues an operation start signal upon detection. , the power transmission electromagnetic coil 5 starts operating in response to the operation start signal.
The power supply means 6 supplies alternating current power to the power receiving electromagnetic coil 1, and the rectifying means 2 rectifies the alternating current power received by the power receiving electromagnetic coil 1 and supplies it to the vehicle battery 4 to charge it.

[Operations and Effects] According to the charging device having the above configuration, charging power is transmitted between the electromagnetic coil 1 provided on the vehicle and the electromagnetic coil 5 provided on the ground, thereby eliminating the troublesome work of connecting charging wires, etc. The on-vehicle battery 4 can be easily charged without any need.

In particular, if the device of the present invention is installed in a home garage or the like, the battery can be easily charged without having to move the vehicle to a gas station or the like.

[Example] In FIG. 1, a vehicle A is located in a gate-shaped garage G, and a power receiving electromagnetic coil 1 is provided on the lower surface of the vehicle A. The electromagnetic coil 1 is connected to a rectifier circuit 2, and the rectifier circuit 2 is electrically connected to a vehicle battery 4 via an overcharge prevention circuit 3. On the other hand, on the ground side, a power transmitting electromagnetic coil 5 is provided at a position facing the power receiving electromagnetic coil 1.
An oscillation circuit 7 is connected to the electromagnetic coil 5 via a power amplification circuit 6.
is connected.

There are floodlights 1 on both sides of garage G to detect the presence of vehicles.
0A and a light receiver 10B are provided, and a detection signal from the light receiver 10B is input to the position detection circuit 8. The oscillation circuit 7 receives an operation start signal from the position detection circuit 8 and generates an oscillation signal. The power supply circuit 9 is connected to each of the above circuits and the projector 1.
Supplying operating power to 0A.

The power receiving electromagnetic coil 1 is actually attached to the lower surface of the contact body of the vehicle A, as shown in FIG. It is installed inside the car stop 11. Thus, when the vehicle tire 12 is in contact with the car stop 11 as shown in the figure, the rain gauge magnetic coil 1.5 faces directly and can be electromagnetically coupled.

In FIG. 3, the light transmitter 10A includes a light bulb 101 and a lens 1.
02, and the light receiver 10B has a lens 103 and a light receiving element 104 such as a CdS cell. The parallel light beam emitted from the projector 10A enters the light receiving element 104, but if the vehicle A is present, the light beam is blocked and does not enter the light receiving element 104.

FIG. 4 shows the configuration of the power supply circuit 9. The power supply circuit 9 includes a transformer 91, a full-wave rectifier 92, and a voltage adjustment IC 93.
9, and 10 is supplied when the power switch 94 is turned on.
0V commercial power supply to 12V and 9V DC voltage P1 respectively
2. Convert to P9 and output. Voltage P9 is supplied to position detection and oscillation circuits 8.7, and voltage P12 is supplied to power amplification circuit 6. Commercial power is directly supplied to the light bulb 101 of the projector 10A via a power switch 94.

FIG. 5 shows the configuration of the position detection circuit 8. The position detection circuit 8 has a voltage comparator 81 equipped with a feedback resistor 82 that provides hysteresis, and a reference voltage VC obtained by resistor-dividing the power supply voltage P9 is input to the "-" terminal of the comparator 81. . A detection voltage Vm is input to the "+" terminal of the comparator 81, and the voltage Vm is inputted to the "+" terminal of the comparator 81.
m is the power supply voltage P9 divided by the light receiving element 104, the sensitivity adjustment variable resistor 83, etc. In the figure, 84 is a noise absorbing capacitor.

When the incidence of light is blocked, the resistance value of the light receiving element 104 increases, Vm>Vc, and the comparator 81 outputs the operation start signal 8a at the "1" level.

In the oscillation circuit 7 shown in FIG. 6, inverters 71, 72, and 73 connected in series constitute an RC oscillation section together with a resistor and a capacitor connected between these inputs and outputs, and the oscillation frequency is controlled by a variable resistor. Approximately 10KH2 by 74
It is set to . Inverters 75, 78, resistor 76, and capacitor 77 constitute a delay circuit, and
The excavation signals m and n outputted from the gates 79A and 79B are rectangular pulses that alternately go to the "1" level at intervals of the delay time td, as shown in FIG. 9 (6) and (7). The time td is approximately 5 μs.

The waveforms of each signal iSj, k, 1 in the circuit are shown in Fig. 9 (1) to
Shown in (4). Note that the operation start signal 8a (Fig. 9 (
5)) is input to the AND gate 79A179B, and the excavation signals m and n are output only when the signal 8a is input.

FIG. 7 shows the configuration of the power amplifier circuit 6. The power amplifier circuit has four power transistors 61A, 61B, 61G, and 61D that drive the power transmission electromagnetic coil 5, and the transistor 61A161D is a switching transistor 62A.
The transistors 61B and 61C are activated by the switching transistor 62B. A resonance capacitor 6 is connected in series to the electromagnetic coil 5.
3 is connected, the natural frequency at resonance is approximately 10KH2l,
: It is set. Here, the electromagnetic coil 5 has a diameter of 15
cm, has an air core structure with an inductance of 10mH,
The capacitor 63 is 22 μF and has a withstand voltage of 250V.

Oscillation signals m and n are provided by transistors 62A162B, respectively.
When the oscillation signal @m is input, the transistors 61A and 61D are turned on to excite the electromagnetic coil 5 in the positive direction, and when the oscillation signal n is input, the transistors 618 and 61
0 becomes conductive and excites the electromagnetic coil 5 in the opposite direction. In this way, AC power is supplied to the electromagnetic coil 5.

FIG. 8 shows the rectifier circuit 2 and the overcharge prevention circuit 3.

The rectifier circuit 2 includes a resonance capacitor 21, a full-wave rectifier 22,
and a smoothing capacitor 23, and the power receiving electromagnetic coil 1 is connected in parallel to the co-conducting capacitor 21.

The overcharge prevention circuit 3 includes a current limiting resistor 31, a Zener diode 32, and a diode 33.

The alternating magnetic field generated by the power transmission electromagnetic coil 5 efficiently generates induced electromotive force in the power receiving electromagnetic coil 1 whose natural frequency is set to the same value, which is rectified and smoothed and supplied to the vehicle battery 4 for charging.

At this time, even if the current supply capacity of the rectifier circuit 2 significantly exceeds the current consumption of the battery 4, the Zener diode 32 of the overcharge prevention circuit 3 prevents the charging voltage from increasing excessively.

As described above, according to the charging device of the present invention, since charging power is efficiently transmitted from the power transmission electromagnetic coil provided on the ground to the power receiving electromagnetic coil of a vehicle positioned in a garage, for example, the charging The on-vehicle battery can be charged simply and easily without the need for complicated connections such as connection or the trouble of moving the vehicle to a gas station or the like.

Note that instead of detecting the vehicle position using light in the above embodiment, radio waves or ultrasonic waves may be used.

If the power switch 94 of the above embodiment is replaced, for example, with a limit switch provided on the car stopper 11 and activated when the tire 12 comes into contact with it, the position detection circuit 8 becomes unnecessary, and moreover, when the limit switch is not activated, the entire charging device is powered off. Since the power is cut off, the power consumption when the device is on standby becomes almost zero.

Furthermore, in places where it is difficult to supply commercial power, it is possible to use, for example, the output power of a solar cell stored in a secondary battery as a power source.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the overall configuration of the device, Figure 2 is a rear side view of the vehicle, Figure 3 is a schematic diagram of the emitter and receiver, Figure 4 is a circuit diagram of the power supply circuit, and Figure 5 is a schematic diagram of the emitter and receiver. The circuit diagram of the position detection circuit, Figure 6 is the circuit diagram of the oscillation circuit, Figure 7 is the circuit diagram of the power amplifier circuit, Figure 8 is the circuit diagram of the rectifier circuit and overcharge prevention circuit, and Figure 9 is the circuit diagram of the oscillation circuit. 2 is a time chart of each signal. 1... Electromagnetic coil for power reception 2... Rectifier circuit 4... Car battery 5... Electromagnetic coil for power transmission 6... Power amplification circuit (Power supply means) Fig. 1 G 2 Fig. 3 Δ Fig. 4 Fig. 5 Fig. 6 "/'/ Fig. 7 Fig. 8 Fig. 9

Claims (1)

[Claims] A power receiving electromagnetic coil provided on a vehicle; a power transmitting electromagnetic coil provided on the ground and directly facing and electromagnetically coupled to the power receiving electromagnetic coil; and a vehicle in which the power receiving electromagnetic coil directly faces the power transmitting electromagnetic coil. a position detection means that detects a position and issues an operation start signal upon detection; a power supply means that starts operation in response to the operation start signal and supplies alternating current power to the power transmission electromagnetic coil; A vehicle charging device comprising a rectifier for rectifying the alternating current power and supplying the rectified AC power to an on-vehicle battery to charge the same.