JPH088184B2 - Non-contact power supply - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a contactless power supply device.

[0002]

2. Description of the Related Art A single loop-shaped power supply line connected to a high frequency constant current power source is inserted into a current transformer, and various loads such as lighting fixtures are connected to the output winding of the current transformer. The electromotive force that tries to prevent the change of the magnetic field generated in the core of, is generated by the electromagnetic induction action, and the electromotive force is supplied to the above load as a current in the contactless / wireless manner, For example, the actual exploitation 59-4
It is publicly known as seen in No. 6496, No. Kaikai 1-1180152 and the like.

[0003]

In the contactless power supply device as described above, when the circuit from the output winding wound around the core of the current transformer to the load maintains the closed state, Although the current can be normally supplied to the output circuit, the output circuit is opened due to disconnection, etc., and the load becomes unloaded, causing the core of the current transformer to abnormally generate heat, or the output circuit to have an abnormally high voltage. If it occurs, there is a risk of causing a fire accident or personal injury.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and one loop-shaped power supply line connected to a high frequency constant current power supply is inserted into a current transformer because of its structure. In addition, in the contactless power supply device that connects various loads such as lighting fixtures, heaters, DC motors, electric tools, etc. to the output winding of the current transformer, and supplies the load by electromagnetic induction action of the current transformer,

In the output circuit from the current transformer to the load, a thermal protector for opening the circuit for detecting abnormal heat generation of the core due to the no-load state of the load and a high-voltage absorbing capacitor are installed. It is a feature.

[0006]

According to the above configuration of the present invention, the load of the lighting fixture, the heater, the electric tool, etc. is in a no-load state, and an abnormal high voltage is generated in the output circuit from the current transformer, or the current transformer. If an abnormally high temperature is generated in the core of the above, the output circuit of the safety capacitor and the thermal protector will open automatically, so a fire accident should occur during its use. There is no risk of causing personal injury or injury, and it can be used safely.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of the present invention, in which (11) is a commercial power source (AC100V) and (12) is a high frequency wave connected to it. It is a constant current power supply (inverter) and outputs a high frequency current of 100 KHz and 10 A, for example. (1
3) is one loop-shaped power supply line connected to the output terminal side of the high frequency constant current power supply (12), and penetrates the current transformer (14).

The output winding (15) of the current transformer (14) has a lighting fixture, a heater, a DC motor,
Various loads (16) such as a soldering iron and an electric tool are connected. Therefore, when a current is passed through the power supply line (13),
When a magnetic field is generated in the core of the current transformer (14) and the output winding (15) is passed through the core, an electromotive force that tries to prevent the change of the magnetic field is generated by the electromagnetic induction action, and the electromotive force is generated. It will be supplied to the load (16) as a current.

In this regard, in the illustrated embodiment, the load (1
6) is used as a discharge tube lighting fixture, and the output winding (15) of the current transformer (14) is connected to both terminals of the discharge tube. (17) is a condenser for starting the lighting fixture, which not only provides an optimum starting voltage by flowing a preheating current to the filament but also prevents the output circuit from being opened when there is no load such as when the filament breaks. .

Reference numeral (18) is a pair of parallel safety capacitors installed in the output circuit from the current transformer (14) to the load (16), which is generated in the output circuit of the load (16) when there is no load. Abnormally high voltage is absorbed to prevent the output circuit from opening.

Further, (19) is a thermal protector for short circuit which is also installed in the output circuit, and the current transformer (14) is caused by the opening of the output circuit when there is no load.
In order to prevent the core from abnormally generating heat, it functions as a switch that short-circuits the output circuit as soon as it senses that it has reached its preset set temperature (for example, about 110 ° C.).

The current transformer (14) is divided into two pairs of first and second cores (20) and (21) whose cores are opposed to each other, so that the current transformer (14) is connected to the power supply line (13) passing therethrough. It is configured as a clamp type that can be locked and disengaged.

That is, as is apparent from FIGS. 2 to 15 showing the mounted product, the first and second cores (20) and (21) are made of ferrite having a small heat loss and come into surface contact with each other to form a circular core. It is shaped like a C and is housed in a hard synthetic resin half-piece open / close case (22). Reference numeral (23) is a case body of the opening / closing case (22), of which approximately one half has a C-shaped relatively deep cross section as the first core storage chamber (S1), and the other half remains the wiring board storage chamber (S1).
As 2), each has a shallow U-shaped cross section, and a partition wall (24) partially cut out for conducting wires stands up at the boundary position of both storage chambers (S1) (S2). are doing.

Reference numeral (25) is a cover for opening and closing the wiring board storage chamber (S2) of the case body (23), which has a U-shaped cross section facing the wiring board storage chamber (S2). The edges of the opening (25) and the case body (23) on one side of the opening are pivotally connected to each other via a thin first hinge (26).

Reference numeral (27) is a plurality of elastic hooks projecting from the other edge of the opening of the cover (25) toward the wiring board housing chamber (S2), and (28) is the elastic hooks (2).
7) The cover (2) is detachably engaged with the cover (2).
5) is a receiving claw that fixes 5) to the lid-covered state of the wiring board storage chamber (S2), and correspondingly projects from the opening other side edge of the case body (23).

On the other hand, (29) is the same as the case body (2
3) is a cover case that opens and closes the first core storage chamber (S1), and has a C-shaped cross section facing the first core storage chamber (S1) so that the inside thereof is the second core storage chamber (S3). ). Moreover, the cover case (29) and the case body (23)
The upper edges of the openings of and are pivotally connected to each other through a thin second hinge (30).

The opening / closing cover (25) of the wiring board storage chamber (S2) and the opening / closing cover case (29) of the first core storage chamber (S1) are in a thin first position in a positional relationship orthogonal to each other. It is pivotally connected to the case body (23) by the two hinges (26) and (30).

In that case, unless the wiring board storage chamber (S2) of the case body (23) is fixed in the covered state by the cover (25), the first core storage chamber of the case body (23) is also the same. (S1) to the cover case (2
By 9), it cannot be fixed in the closed state.

Therefore, (31) is a cover case (2)
9) A plurality of elastic claws that are projected and bent from the lower edge of the opening in a folded state, (32) is a locking step part that is cut away at each halfway height position of the folding, and (33) is an elastic claw (3).
In order to receive the bent portion of 1), the receiving hole formed corresponding to the upper edge of the opening of the cover (25), (34) is a wedge claw for receiving the locking step portion (32), and similarly the cover (25). ) Is installed at the upper edge of the opening.

That is, the elastic hooks (27) of the cover (25) are locked to the receiving claws (28) of the case body (23) and the cover (25) is used to cover the case body (2).
The wiring board storage chamber (S2) of 3) is fixed in a covered state, and then the elastic claw (31) of the cover case (29) is pushed into the receiving hole (33) of the cover (25). , The locking step portion (32) of the cover case (29) is automatically locked to the wedge claw (34) of the cover (25) and is fixed so as not to be detached.
The first core storage chamber (S1) of the case body (23) is also kept covered by the cover case (29).

Reference numeral (35) is a screw receiving hole for preventing the cover case (29) from being opened accidentally, and is formed as a spare corresponding to the cover case (29) and the cover (25). Reference numeral (36) is a receiving mouth tube for the tapping screw (37) which also prevents the cover (25) from being opened accidentally.

The first core (20) is in the first core storage chamber (S1) of the case body (23), and the second core (21) is in the second core storage chamber (29) in the cover case (29). S3), the first and second cores (20) and (21) are in surface contact with each other to form a circle when the cover case (29) covers the case body (23). Shape the transformer (14).

Reference numerals (38) and (39) denote presser frames for the first and second cores (20) and (21), each of which is formed of hard synthetic resin into a substantially H-shape in plan view. A pair of wedge legs (40) (41) hanging from both ends
Each into the core storage chamber (S1) (S3),
The wedge leg (4) is attached to the locking claws (42) (43) correspondingly projecting from the inner wall surfaces of the respective core storage chambers (S1) (S3).
The first and second cores (20) and (21) are held by the 0) (41) so as not to fall off.

Further, the portions of the holding frames (38) (39) that penetrate the cores (20) (21) are concave grooves (44) (4).
As 5), the loop-shaped feeder line (13) can be inserted. In addition, both presser frames (38) (3
9) are the same as each other.

(46) is the first and second cores (20) (2
The cover case (2) is a plurality of elastic pieces for applying back pressure so as to always make surface contact with each other in a stable manner.
The second core (21) in the second core storage chamber (S3) is pressed and urged toward the first core (20) by being bent and bent inward from the back wall surface of 9).

An output winding (15) is wound around the first core (20) via a bobbin (47), and the bobbin (47) has a lead wire to a thermal protector (19). (48) is also wrapped around.

(49) is the thermal protector (1
A heat sink surrounding 9), which is bent from a metal plate having good thermal conductivity into an arc shape capable of fitting with the first core (20).
The temperature response characteristic of 9) is improved.

That is, the thermal protector (19) detects abnormal heat generation of the cores (20) (21) due to the no-load state of the output circuit as described above, and shuts off the flow of current to the output circuit. However, the sensing performance can be adjusted by the heat sink (49). (50) is the heat sink (4
9) is an elastic pressing piece for crimping 9) to the first core (20), and is projected from the partition wall (24) into the first core storage chamber (S1).

Reference numeral (51) is a printed wiring board of the output circuit, which is a wiring board housing chamber (S) of the case body (23).
It is housed in 2) and its printed wiring board (51)
The safety capacitor (18) is wired in parallel with the starting capacitor (17). (52) is a receiving seat of the wiring board (51), (5)
Similarly, 3) is an elastic wedge claw that locks the wiring board (51) and is formed so as to project on the inner wall surface of the wiring board storage chamber (S2). (54) is a printed wiring board (51)
To the load (16) above.

According to the above configuration, the current transformer (1
The first and second cores (20) and (21) forming 4) are housed as a pair of two C-shapes facing each other in a half-split type opening / closing case (22) that opens and closes around the fulcrum of the second hinge (30). Therefore, by opening and closing the open / close case (22) so that one loop-shaped power supply line (13) penetrates through the cores (20) (21), the power supply line (13) is closed. It can be engaged and disengaged.

Then, for example, in the use condition of FIG. 1 in which the load (16) is used as a lighting fixture, the current transformer (14) receives a high frequency constant current of 10 A, and the output winding (15) of the current transformer (14). Assuming that the number of turns in (3) is 23 turns, the value of the current flowing through the output circuit is inversely proportional to the number of turns ratio, resulting in approximately 0.43 A, which flows through the starting capacitor (17) and the load (1
Turn on the lighting equipment in 6).

During use, due to a no-load condition such as filament breakage, the output circuit may have a voltage of, for example, 600-80.
An abnormal high voltage of 0V may occur, or a current transformer (1
When an abnormally high temperature of 110 ° C or higher occurs in the cores (20) and (21) of 4), the output circuit is automatically opened by the functions of the safety capacitor (18) and the thermal protector (19). As a result of no current flowing through the load (16), there is no risk of causing a fire accident or personal injury.

[0033]

As described above, according to the present invention, one loop-shaped power supply line (1) connected to the high frequency constant current power supply (12) is used.
3) is inserted into the current transformer (14), and the output winding (15) of the current transformer (14) has various loads (16) such as lighting fixtures, heaters, motors, and electric tools.
Connect the current transformer (14) to the load (16)
In the contactless power supply device that supplies power by the electromagnetic induction action of

From the current transformer (14) to the load (1
In the output circuit to 6), a thermal protector (19) for opening the circuit that detects abnormal heat generation of the cores (20) (21) due to the no-load state of the load (16) and a high-voltage absorbing capacitor. Since (18) and are installed,
The problems of the prior art mentioned at the beginning can be surely improved, and there is an effect that a contactless power supply device excellent in safety can be provided.

Particularly, if the configuration of claim 2 is adopted,
Heat sink (49) and this core (20) (21)
There is also an effect that the temperature response characteristics of the thermal protector (19) can be remarkably improved by the elastic pressing piece (50) to be pressure-bonded to the.

Further, if the configuration of claim 3 is adopted,
Current transformer (14) forming the contactless power supply of the present invention
Can be locked and disengaged to one loop-shaped power supply line (13) even from the middle part in the longitudinal direction, and the wiring work to various loads (16) can be performed with high efficiency. Therefore, it can be said that the invention is highly practical.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a perspective view showing a mounted state of a current transformer according to the present invention.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a rear view of FIG.

FIG. 5 is a left side view of FIG.

FIG. 6 is a right side view of FIG.

FIG. 7 is a front view of a developed state in which an opening / closing case is extracted and shown.

FIG. 8 is a front view showing a housed state of a core, a printed wiring board and the like corresponding to FIG.

9 is a sectional view taken along line 9-9 of FIG.

10 is a sectional view taken along line 10-10 of FIG.

FIG. 11 is a cross-sectional view showing a lid-covered state of the opening / closing case corresponding to FIG.

FIG. 12 is a perspective view showing a core extracted.

13 is a sectional view taken along line 13-13 of FIG.

FIG. 14 is a perspective view showing a holding frame of the core extracted.

FIG. 15 is a sectional view taken along line 15-15 of FIG.

[Explanation of symbols]

 (12) -High frequency constant current power supply (13) -Feeding wire (14) -Current transformer (15) -Output winding (16) -Load (18) -Safety capacitor (19) -Thermal protector (20) -No. 1 core (21), 2nd core (22), open / close case (49), heat sink

Claims (3)

[Claims] 1. A device connected to a high frequency constant current power supply (12).
Connect the loop power supply line (13) to the current transformer (14).
And the load (16) such as a lighting fixture, heater, DC motor, and electric tool is connected to the output winding (15) of the current transformer (14).
6) In a contactless power supply device for supplying electric current to the current transformer (14) by the electromagnetic induction action, in the output circuit from the current transformer (14) to the load (16), due to the no-load state of the load (16). A non-contact power supply device comprising a thermal protector (19) for opening a circuit for detecting abnormal heat generation of the cores (20), (21) and a capacitor (18) for absorbing high voltage. 2. The thermal protector (19) is surrounded by a heat sink (49) made of a metal having high thermal conductivity, and the heat sink (49) is surrounded by a current transformer (1).
The contactless power supply device according to claim 1, wherein the core (20) (21) of 4) is brought into contact with the core (20) (21) in an elastically biased state. 3. A core (20) of a current transformer (14).
A pair of C-shaped parts (21) facing each other are housed in a rotatable half-open / close case (22), and the current transformer (14) is supplied by opening / closing the open / close case (22). It is set so that it can be detachably locked to the electric wire (13), and the output winding (15) is wound around either one of the cores (20) (21), and the thermal protector (19) is operatively operated. The contactless power supply device according to claim 1, wherein the contactless power supply device is contacted.