JP3392103B2 - Small electrical equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device, electric
Various small electric devices such as razors, electric toothbrushes, and electric tools, in particular, a power supply body for supplying electric power and a device body with a load are configured to be separable from each other, and electromagnetic induction coupling is provided between them. It relates to things that can be used to transfer power.

[0002]

2. Description of the Related Art Conventionally, a small electric device of this type is provided with a secondary battery on the device body side, and the device body is normally set on the power source body side to maintain the charged state of the secondary battery with a small current. It was general to prepare for load driving for a short time by the device body alone. Therefore, while the primary side oscillating part such as the inverter circuit provided in the power supply main body is always in the driving state, the load main body is exclusively used for the purpose of power saving when the main body is removed from the power supply main body for a long time. The output of the primary side oscillating unit is also controlled according to the presence or absence.

[0003]

However, in the above configuration, when the power that can be output from the primary side oscillating section provided on the power supply main body side is increased, a metal piece such as a clip is used instead of the device main body. It has been found that even if the metal piece is arranged close to the primary coil, the metal piece may be mistakenly recognized as an appropriate load and eddy current may flow to generate heat.

The inventors of the present invention have made a study in view of such inconvenience, and as a result, intermittently supply power from the power supply main body side to the device main body side.
By controlling the output of the primary side oscillation unit in response to the signal sent from the equipment main body in conjunction with this , not only can the above-mentioned heat generation accident be prevented, but the power supply main body corresponding to the equipment main body to be used. It was found that the output control of can be performed appropriately.

The present invention has been made on the basis of the above-mentioned findings, and accurately detects the mounting state of the equipment main body to be fed to the power supply main body, and appropriately outputs the primary side oscillating unit such as an inverter circuit. An object of the present invention is to provide a small electric device that can be controlled and can prevent a heat generation accident in which a foreign substance is mistaken for the device body.

A further object of the present invention is to provide a small electric device capable of reliably detecting the device body while maintaining a relatively simple structure.

Still another object of the present invention is to provide a small electric device which corresponds to the load capacity of the device main body used and can easily control the output on the power supply main body side.

[0008]

In order to achieve the above-mentioned object, a small electric device according to the present invention has a configuration similar to that of an inverter circuit 11 shown in FIG. 4, as its basic configuration is schematically shown in FIG. Power supply main body 12 including the primary side oscillation unit 10
If, as the primary coil 14 provided in the primary-side oscillating section 10
Like an output coil 16 electromagnetically coupled with a simple coil member
The device main body 20 including the load 18 such as the secondary battery 38 that is supplied with power via the coil member is detachably connectable to each other.

Further, on the side of the device body 20 described above ,
Formed by intermittently driving the primary side oscillation unit 10.
In conjunction with the load 18 being supplied with the detection signal 22,
A device response means 26 is provided which enables a constant response signal 24 to be output to the power supply body 20 side .

On the other hand, on the power supply main body 20 side,
Corresponding to the answer signal 24, the primary side oscillation unit 10 is continuously driven.
The device detection means 28 that enables a predetermined output control such as
I have it.

The device body 20 described above is electrically connected as shown in FIG.
It is a razor, and the load 18 has a secondary battery 38 and a device response.
And means 26. Furthermore, charging for the secondary battery 38
The device response means 26 is provided with the quantity detection unit 134.
The response signal 24 output from the
Changes in accordance with the stored charge amount information of the secondary battery 38
To be done. The device body 20 further includes a charge amount display unit 13
6 is provided, and the charge amount is displayed on the charge amount display unit 136.
Display corresponding to the charge amount information held by the detection unit 134
Is preferably performed.

Further , the response signal 24 is the above-mentioned primary side oscillation.
Signal with a frequency sufficiently higher than the oscillation frequency in section 10
And the response signal 24 is transmitted via the coil member to the device body 2
A signal is sent from the 0 side to the power supply main body 12 side. Meanwhile, the above
The received response signal 24 is sent to the device detecting means 28.
Configured to include signal discrimination means that can be selectively taken out
can do.

[0013]

As described above, the present invention sends the detection signal 22 to the device body 20 side by intermittently supplying power from the power supply body 12 side, and when the predetermined response signal 24 is returned, the device body 20 is properly operated. After determining that it is connected to
Since the primary side oscillating unit 10 is configured to control the output in response to the response signal, the mounting of the device body 20 to the power source body 12 is reliably determined, and the metal piece is mistakenly recognized as a load to generate heat. Accidents that will cause it will be reliably prevented.

Further, the device body 20 is constructed as an electric razor.
And a charge amount detection unit for the secondary battery 38
By including the display unit 136 and the display unit 136, the power supply main body
Charge state of the device body 20 side using 12 is more accurate
Can understand. In addition, the primary side oscillating unit is used as the response signal 24.
A signal with a frequency sufficiently higher than the oscillation frequency in 10
While using the device detection means 28 side, the signal discrimination means
Used to extract the required response signal 24.
By doing so, the output control on the power supply main body 12 side can be performed reliably and finely.
It can be implemented like this.

[0015]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter the present invention, an example which was carried to the charging device for a secondary battery is not limited thereto, an electric shaver
And such as an electric toothbrush or power tools, power a secondary battery
Needless to say, the present invention can be applied to various small electric devices provided as above.

A charging device for carrying out the present invention is shown in FIGS.
As specifically shown in the configuration thereof, the protection circuit 34 and the inverter circuit 1 as the primary side oscillation unit 10 are provided in the main body case 32.
An inverter-type power supply body 12 of the housing the electrical circuit consisting of 1, fit freely its lower end attached to and detached from the the power supply body 12, a load in the main body casing 36 with the charging current delivered from the power supply main unit 12 side The device main body 20 is capable of charging the secondary battery 38 provided as 18.

The body case 32 of the power source body 12 is a rectangular hollow box body as shown in FIG. 2, and a power cord 44 having a power plug 42 at its tip is extended from the side surface 40 to form an internal electric circuit. Can be connected to the commercial AC power supply 46. Further, a contact surface 48 for contacting the device body 20 is provided on the upper surface side, the contact surface 48 is surrounded, and the side surface 40 is extended upward to form a receiving portion 50 into which the lower end of the device body 20 is removably fitted. ing.

A protection circuit 3 housed in the main body case 32.
4, the metal film resistor 52 connected in series to the power supply line to the inverter circuit 11 blocks a large current from being input, while the overvoltage absorbing element 54 connected in parallel prevents a surge voltage from being input. To prevent. Further, after rectifying the input voltage by the rectifier 56, the temperature fuse 5
And forcibly it can stop the operation of the inverter circuit 11 when excessive heat by 8, and also in the manner to prevent the outflow of noise from the inverter circuit 11 side by the capacitor 60.

In the inverter circuit 11, the primary coil 14 is provided on the collector side of the switching transistor 62 and the protective resistor 64 is provided on the emitter side, and the output control section 66, the timer section 68 and the device detection section are provided on the base side. 70 are provided respectively.

The output control section 66 has a resistor 72 and a capacitor 74 connected in series, a feedback coil 76 is provided between the connection point between them and the base end of the transistor 62, and a switching transistor in parallel with the capacitor 74. Equipped with 78. Therefore , when the transistor 78 is off, the on / off cycle of the switching transistor 62 is restricted to a constant frequency of, for example, about 40 kHz by the charging / discharging time constant of the resistor 72 and the capacitor 74, while the feedback coil 76 and the capacitor 74 control the switching transistor 62. It is configured so that the normal inverter operation is performed with the on-time regulated.

That is, the capacitor 7 is connected via the resistor 72.
4 is charged and when the base voltage of the switching transistor 62 exceeds a set value, collector current begins to flow in the primary coil 14, and the increase in the collector current generates a voltage in the direction of turning on the transistor 62 in the feedback coil 76. Then, the transistor 62 is rapidly turned on.
After the transistor 62 is turned on, the capacitor 74 is charged and discharged, and the base current is reduced, so that the direction of the voltage output from the feedback coil 76 is reversed, and a reverse bias is applied between the base and emitter of the transistor 62 to make the transistor 62. Turn off rapidly. Transistor 6 mentioned above
By repeating the ON / OFF operation of No. 2, the inverter circuit 11 performs self-oscillation at a predetermined frequency.

The capacitor 79 connected in parallel with the primary coil 14 absorbs the shock voltage generated when the switching transistor 62 is turned off. Further, the protection resistor 64 provided on the emitter side of the switching transistor 62 regulates the off-timing of the switching transistor 62 by raising the emitter potential of the switching transistor 62 in response to the increase of the collector current. This is to prevent an excessive current from flowing into the switching transistor 62.

The timer section 68 is always energized when connected to the commercial AC power supply 46, and inputs a clock signal, which is at a high level for a short time of, for example, about 1/10 second every minute, to the base end of the transistor 78. ing. Therefore, the transistor 78 is normally turned on and the capacitor 74 is turned on.
The inverter circuit 11 is forcibly stopped by short-circuiting both ends of the inverter circuit 11. However, the transistor 78 is turned off for a short time each time a signal is input from the timer unit 68, and the inverter circuit 11 is intermittently driven at 1-minute intervals. As a result, the detection signal 22 can be output to the outside of the power supply body 12 via the primary coil 14.

On the other hand, the device detection section 70 charges the capacitor 84 using the diode 82 with the voltage induced in the detection coil 80 by the response signal 24 sent from the device body 20 side in response to the detection signal 22. This charging voltage is input to the base terminal of the transistor 78 via the diode 86. Therefore, while the response signal 24 is being received, that is, the device main body 20 is connected to the power supply main body 12
During mounting, the transistor 78 is turned off, the inverter circuit 11 is continuously driven, and necessary power is supplied from the primary coil 14 to the output coil 16 on the device body 20 side. However, when the response signal 24 is not input, the charging voltage is immediately discharged by the resistor 88 connected in parallel with the capacitor 84, the transistor 78 is turned on again, and the inverter circuit 11 is stopped and controlled.

The device main body 20 has a rectangular hollow main body case 36, and a secondary battery 3 such as a plurality of nicad batteries is provided in an upper portion of the main body case 36.
8 is housed, a power supply unit 90 that supplies a predetermined charging current to the secondary battery 38 and a device response unit 92 that sends a response signal 24 to the power supply body 12 side are provided in the lower portion of the body case 36. Further, on the lower end side of the main body case 36, a contact surface 94 which fits the receiving portion 50 of the power supply main body 12 and contacts the contact surface 48 is provided, and on the upper surface side, from the secondary battery 38 to an external load 95 such as a motor. A plug 96 for supplying electric power is provided.

The primary coil 14 of the inverter circuit 11 is
The core 10 is wound on the coil bobbin 98 provided in the main body case 32 on the power supply main body 12 side and penetrates through the center thereof.
0 is projected from the contact surface 48. On the other hand, the device body 2
An engaging hole 102 into which the core 100 of the primary coil 14 is fitted is provided on the contact surface 94 on the 0 side, and a bobbin 104 is provided so that the center of the engaging hole 102 coincides with the engaging hole 102.
The output coil 16 is wound on the wire 4. Therefore, when the power supply main body 12 and the device main body 20 are appropriately arranged so as to match the contact surfaces 48 and 94, the primary coil 14 and the output coil 16 are positioned on the same core 100 and are electromagnetically inductively coupled to each other. A predetermined voltage is induced across the output coil 16 in response to changes in the current in the primary coil 14. The induced voltage is selectively extracted by the rectifying diode 106 a voltage generated during the off period of the switching transistor 62 of the inverter circuit 11 and sent to the secondary battery 38 to be used for charging.

On the other hand, the device response section 92 is a response coil 108 having substantially the same structure as the primary coil 14, and outputs the voltage output from the output coil 16 during the ON period of the switching transistor 62 to the diode 110. Induced current is applied by selectively applying
It is configured like . The response coil 108 is integrally coupled via a core 112 and a detection coil 80, which is provided at a corresponding position of the contact surface 48 on the power supply body 12 side and has substantially the same configuration as the output coil 16, and a predetermined response signal 24. The device body 2
The inverter circuit 11 is continuously driven by being sent from the 0 side to the power supply main body 12 side in a non-contact state.

The voltage induced in the output coil 16
Instead of using the half wave to drive the device response unit 92,
A search coil is provided on the bobbin 104 separately from the output coil 16.
In preparation for this, the output voltage from this coil drives the device response unit 92.
It may be driven.

In addition, the primary coil 14 and the output coil 16,
The shapes and coupling states of the response coil 108 and the detection coil 80 can be changed as appropriate as long as electromagnetic coupling is possible. For example, the protruding positions or directions of the cores 100 and 112 may be changed, the cores of both coils 14 and 16 may be individually provided to prevent the cores from protruding from the body cases 32 and 36, and the oscillation frequency in the inverter circuit 11 may be increased. By doing so, it is also possible to form the coils 14 and 16 in a printed form and eliminate the core itself.

Furthermore, instead of outputting the detection signal 22 by intermittently driving the inverter circuit 11 using the timer section 68 when the device body 20 is detached from the power source body 12, the output power from the inverter circuit 11 is sufficient. A detection signal 22 is formed by continuously or intermittently driving in a suppressed state, and when the connection of the device body 20 is detected as described above, the inverter circuit 11 is continuously driven in a full power state. You can also do it.

Further, the inverter circuit 11 is not limited to the self-exciting type as described above, and may be of the separately exciting type in which an oscillator for turning on / off the switching transistor 62 is separately provided. Furthermore, as the primary side oscillating unit 10, instead of using the inverter circuit 11 as described above, the frequency of the commercial AC power source 46 may be used as it is.

[0032] Figure 5 is a further embodiment of the present invention, it detects a magnetic change at the time when the machine body 20 is properly attached to the power supply body 12, as to control the output of the inverter circuit 11 It is the one.

That is, the output coil 1 is provided on the device body 20 side.
A response signal driven by the induced voltage of 6 and having a frequency sufficiently higher than the oscillation frequency of the inverter circuit 11, for example, AM, F
While a device response section 92 capable of outputting an M-modulated signal is provided, on the power supply main body 12 side, such as a current flowing through the primary coil 14 or a feedback coil wound concentrically with the primary coil 14 or an independent search coil. A device detection unit 70 capable of extracting the response signal of the above-mentioned predetermined oscillation frequency from the current flowing through the coil via signal discrimination means such as a bandpass filter.
Is equipped with.

Therefore, as a result of the device response section 92 sending the response signal to the output coil 16 only during the period when the device body 20 is coupled to the power supply body 12, the change of the response signal is returned to the primary coil 14 side. , Which is selectively taken out by the device detection unit 70 and used for output control of the inverter circuit 11.

FIG . 6 further embodies the invention in an electric razor.
It is a block diagram which shows an example. In this embodiment
Uses the inverter circuit 11 on the power supply body 12 side to
When the secondary battery 38 provided on the container body 20 side is rapidly charged,
In addition, the terminal voltage of the secondary battery 38, charging time or load
Via the switch 133 for the motor 132 provided as
The current charge in the secondary battery 38 corresponding to the energized state
The detection unit 133 accumulates and stores the amount of electricity, and the amount of charge is displayed on the display unit
Displaying using 138 is the same as the conventional one.

In the present invention, the output coil 16
Power source main body provided with a device response section 92 driven by the power supply from
Charge amount is detected while the device body 20 is set to 12 and power is being supplied.
The charge amount information of the secondary battery 38 held in the section 134 is applied.
It is superposed on the answer signal 24 and sent to the power supply main body 12 side, and the device inspection is performed.
Using the information on the amount of charge extracted using the intelligence unit 70, output
The output of the inverter circuit 11 is controlled by the control unit 138.
I am trying to do it.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a basic configuration of the present invention.

2 shows an example of an appearance shape implemented to the charging device of the present invention is a partially broken away perspective view.

FIG. 3 is a vertical cross-sectional view showing a state in which the power supply main body and the device main body of FIG. 2 are normally coupled.

FIG. 4 is a circuit diagram showing an example of an electrical configuration of a charging device.

[5] Ru explanatory view showing another embodiment of the present invention.

FIG. 6 is a block diagram showing an example in which the present invention is applied to an electric shaver.
It is a lock figure.

[Explanation of symbols]

10 Primary side oscillator 11 Inverter circuit 12 power supply 14 Primary coil 16 output coils 18 load 20 device body 22 Detection signal 24 Response signal 26 Device response means 28 Equipment detection means 30 control signals 32 body case 38 Secondary battery 62 Switching transistor 66 Output control unit 68 Timer 70 Device detector 90 power supply 92 Device response section 108 Response coil 134 Charge amount detector 136 Charge amount display 138 Output control unit

Front page continuation (72) Inventor Takanori Hatanaka Nakakata, Tagawa-gun, Fukuoka Prefecture 4680 Ikata, Kyushu Hitachi Maxell Co., Ltd. (56) References JP-A-5-89296 (JP, A) JP-A-4-67732 (JP, A) JP-A-3-128627 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02M 3/28 B26B 19/38 H02J 7/00 H02J 17/00

Claims (4)

(57) [Claims] 1. A power supply main body (12) having a primary side oscillating section (10), and a load supplied with power through a coil member electromagnetically coupled to the coil member of the primary side oscillating section (10). And a device body (20) which is detachably connectable to each other, wherein the primary side oscillating part (10) is provided on the device body (20) side.
Signal (22) formed by intermittently driving
In response to the load being fed by the
4) While a power supply body (20) device responsive means for enabling the output to the side (26), said power supply body (20) on the side, it received the response signal (the primary-side oscillating section in response to 24) A small electric device comprising a device detection means (28) capable of controlling the output of (10). Wherein said device body (20) is an electric shaver, the load includes the said instrument response means and the secondary battery (38) (26), further charging of the secondary battery (38) Quantity detector (13
4), and the response signal (24) output from the device response means (26) corresponds to the charge amount information of the secondary battery (38) held by the charge amount detection unit (134). 2. The small electric device according to claim 1, wherein the small electric device is changed. 3. The device main body (20) further has a charge amount table.
The charge amount display unit (136) is provided with a display unit (136).
The amount of charge held by the charge amount detector (134)
The small electric device according to claim 2, wherein a display corresponding to the information is performed . 4. The response signal (24) is generated from the primary side.
Frequency sufficiently higher than the oscillation frequency in the vibrating section (10)
And the response signal (24) is the signal of the device through the coil member.
Signal transmission from the body (20) side to the power supply body (12) side
The response signal (24) is sent to the device detection means (28).
A signal discriminating means capable of selectively taking out
2. Small electrical equipment as described in 2.