JP3197625B2 - Charger having inductive inverter circuit - 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 having an inductive inverter circuit.

[0002]

2. Description of the Related Art A charging device having an inductive inverter circuit is an optimal method for a completely waterproof electric toothbrush or the like. This is because the secondary battery incorporated in the electric toothbrush can be charged without contacting the electric contacts. This method is
Instead of electrical contacts, power is transferred by induction transformers.
Electric power is supplied from the charging stand to the electric device by electromagnetically coupling the charging stand and an induction transformer built in the electric device. In this way, a charging device that charges a secondary battery of an electric device has a built-in inverter circuit in a charging stand. The inverter circuit converts AC to DC, and further converts DC to high-frequency AC so that power can be efficiently transferred by a small transformer. On the other hand, electric equipment incorporates a guided transformer that is electromagnetically coupled to an induction transformer of an inverter circuit. The guided transformer is disposed close to the induction transformer of the charging stand, and carries power from the induction transformer to the guided transformer by electromagnetic induction. The AC output of the induced transformer is rectified and supplied to the secondary battery.

[0003]

The charging device of this structure can carry electric power without the use of electric contacts, so that the electric equipment can be made completely waterproof, and furthermore, there is a feature that failure due to poor contact can be eliminated. . However, the charging device having this structure has a drawback that a secondary battery incorporated in an electric device cannot be rapidly charged. This is because the state of charge of the secondary battery cannot be fed back to the charging circuit of the charging stand. Therefore, the charging device of the inductive inverter circuit always trickle charges the secondary battery incorporated in the electric device. Since the charging current for trickle charging is limited to a current that continuously charges the battery and does not overcharge, the charging current is designed to be small. For this reason, if the secondary battery is completely discharged during use, there is a disadvantage that it takes several hours before it can be reused. This is because it takes time to charge until it can be reused by trickle charging.
Therefore, there is a drawback that the usage state is limited and the user cannot use it whenever he needs it.

[0004] The present invention has been developed to solve this drawback, and an important object of the present invention is to prevent the battery performance from deteriorating due to overcharging, and to maintain the battery performance even after the battery is completely discharged. Another object of the present invention is to provide a charging device having an inductive inverter circuit that can make an electric device reusable in a short time.

[0005]

A charging device having an inductive inverter circuit according to the present invention has the following constitutions (a) to (f) in order to achieve the above object, and in particular, (α)
Characterized by having the following configuration. (A) The charging device includes a primary charging circuit 2 built in a charging stand 1 for setting and charging an electric device, and a secondary charging circuit 3 charging a secondary battery E built in the electric device. Is provided. (B) The primary-side charging circuit 2 includes an inverter circuit 4 that converts a direct current into a high-frequency alternating current and carries power to an electric device by electromagnetic induction. (C) The inverter circuit 4 switches the direct current to convert the direct current into an alternating current, the induction transformer 6 driven by the switching element 5 to carry the power to the electric equipment, and turns the switching element 5 on and off at a predetermined duty. And a control circuit 7. (D) The secondary-side charging circuit 3 built in the electric device
It includes an induced transformer 8 that is magnetically coupled to the induction transformer 6 of the secondary charging circuit 2 and a rectifier circuit 9 that rectifies the output of the induced transformer 8 and supplies the output to the secondary battery E. (E) The guided transformer 8 is connected via the waterproof member 10
It is disposed at a position close to, but not in contact with, the induction transformer 6 of the primary side charging circuit 2 and is electromagnetically coupled. (F) The rectifier circuit 9 is connected between the induced transformer 8 and the secondary battery E built in the electric device, rectifies the AC output of the induced transformer 8 to the secondary battery E of the electric device. Supply. (Α) The primary side charging circuit 2 controls the inverter circuit 4 to switch between quick charging and trickle charging, and a timer 12 for setting a quick charging time of the rapid / trickle switching circuit 11. , A start means 13 for starting counting by the timer 12. Further, the timer 12 is provided with a start means 13 during counting.
And a start signal ignoring circuit 14 for ignoring a start signal input from the CPU. When a start signal is input from the start means 13, the timer 12 starts counting, and while the timer 12 is counting, the rapid / trickle switching circuit 11 starts counting.
Are configured to control the inverter circuit 4 to a quick charge state.

[0006]

The charging device having the inductive inverter circuit 4 of the present invention performs the following operation to charge the secondary battery E built in the electric equipment. The electric device is set on the charging stand 1. When the timer 12 is not counting, the rapid / trickle switching circuit 11 brings the inverter circuit 4 into a trickle charged state. At this time, the control circuit 7 of the inverter circuit 4 adjusts the duty of the switching element 5 so as to perform trickle charging. That is, the inverter circuit 4
In order to reduce the output of the switching element 5, the on-time of the switching element 5 is made shorter than the off-time. Since the induction transformer 6 of the inverter circuit 4 is magnetically coupled to the guided transformer 8 built in the electric device, an alternating current is induced in the guided transformer 8. The AC output of the induced transformer 8 is rectified and supplied to the secondary battery E. The duty of the power supplied from the induced transformer 8 to the secondary battery E is adjusted by the inverter circuit 4 so as to be a trickle charging current. In this state, the secondary battery E is always trickle charged. When the electric device is used separately from the charging stand 1 and the secondary battery E is completely discharged, and the electric device cannot be used,
The electric device is set on the charging stand 1 and the start means 13 is operated to output a start signal. The start signal of the start means 13 is input to the timer 12, and the timer 12 starts counting. The start signal input while the timer 12 is counting is ignored. In other words, the timer 12 is activated by the first input start signal and counts the set time. When the timer 12 starts counting, the quick / trickle switching circuit 11 controls the inverter circuit 4 to control the control circuit 7 to bring the duty of the switching element 5 into a quick charge state. That is, by increasing the duty,
The ON time of the switching element 5 with respect to the OFF time is lengthened. The main power of the inverter circuit 4 increases, a large amount of power is output to the induced transformer 8, and the secondary battery E is rapidly charged. The timer 12 stops counting when the set time has elapsed. When the timer 12 finishes counting, the rapid / trickle switching circuit 11 switches the inverter circuit 4 to a trickle charge state. For the set time of the timer 12, for example, the secondary battery E is charged so that the electric toothbrush can be used once. Therefore, when the quick charging is completed, the electric device can be separated from the charging stand 1 and used again.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below illustrate a charging device having an inductive inverter circuit for embodying the technical idea of the present invention, and the charging device of the present invention has a circuit configuration and components. The type, form, structure and arrangement are not specified below. Various changes can be added to the charging device of the present invention within the scope of the claims.

Further, in this specification, in order to facilitate understanding of the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims”, “action”, and “action”. In the column of "Means for solving the problem". However, the members shown in the claims are
It is by no means specific to the members of the embodiment.

A charging apparatus having an inductive inverter circuit 4 shown in FIG. 1 is a charging stand 1 for setting and charging electric equipment.
And a secondary charging circuit 3 for charging a secondary battery E incorporated in an electric device.

The primary charging circuit 2 includes an inverter circuit 4
A rapid / trickle switching circuit 11, a timer 12,
Starting means 13.

The inverter circuit 4 rectifies a commercial power supply of AC100V to DC, and converts the DC into a high-frequency AC. The output of the inverter circuit 4 is the primary side charging circuit 2
Through the inductive transformer 6 and the inductive transformer 8 of the secondary side charging circuit 3 by electromagnetic induction. The inverter circuit 4 includes a switching element 5 that switches DC to convert AC, and an inductive transformer 6 that is driven by the switching element 5 and carries power to electric equipment.
And a control circuit 7 for turning on and off the switching element 5 at a predetermined duty.

The control circuit 7 changes the duty for turning on and off the switching element 5 between trickle charging and quick charging of the secondary battery E. If the duty is increased to increase the on-time relative to the off-time of the switching element 5, the output power of the inverter circuit 4 increases. Therefore, when trickle charging the secondary battery E, the duty is reduced and the output is reduced. When charging fast, increase the duty,
Increase the output. The duty of the ON / OFF time of the switching element 5 at the time of trickle charge and at the time of quick charge is trickle-charged to the secondary battery E with an appropriate current.
Designed for quick charging.

The quick trickle switching circuit 11 controls the control circuit 7 to switch the inverter circuit 4 between a quick charge state and trickle charge. Rapid / trickle switching circuit 11
Is controlled by the timer 12. While the timer 12 is counting, the quick / trickle switching circuit 11 puts the control circuit 7 into a quick charge state. When the timer 12 finishes counting, the rapid / trickle switching circuit 11 brings the control circuit 7 into a trickle charged state.

The timer 12 stores a time for rapidly charging the secondary battery E. The set time of the timer 12 is set to a time during which a completely discharged secondary battery is not overcharged. For example, the set time of the timer 12 is set in a range of 2 to 10 minutes. When the electric device is an electric toothbrush, the secondary battery E is rapidly charged for a set time of the timer 12, and the completely discharged secondary battery E is charged once so that the toothbrush can be brushed. The timer 12 starts counting when a start signal is input from the start means 13.

Further, the timer 12 includes a start signal ignoring circuit 14 for ignoring a start signal input from the start means 13 during counting. Therefore, once the start signal is input and the count is started once, the timer 12 ignores the start signal input during counting, counts for a certain period of time from the first input start signal, and times out. Further, the timer 12 shown in FIG. 1 includes a red light emitting diode 15 and a green light emitting diode 1 for displaying the quick charge and the trickle charge.
6 is provided. The red light emitting diode 15 is turned on during quick charging, and the green light emitting diode 16 is turned on during trickle charging.

FIG. 2 is a circuit diagram showing an example of the timer 12 having a start signal ignoring circuit. The timer 12 shown in this figure includes a timer IC TB1004AF. The pins of the timer IC are output terminals. The push button switch serving as the start means 13 is connected in series with the resistor R1 and the capacitor C1 connected in parallel with each other, and is connected between the pin and the pin. And a capacitor C2 connected to the pin, and a resistor R2 connected to
Thus, the set time of the timer 12 is adjusted. The timer 12 operates as shown in the timing chart of FIG. 3 to switch the inverter circuit 4 between quick charge and trickle charge. (1) When the power is turned on, the pin of the timer IC becomes “H” and the pin becomes “L”. (2) The "L" signal of the pin controls the quick / trickle switching circuit 11 to bring the inverter circuit 4 into a fast charging state. When the "L" signal is input, the quick / trickle switching circuit 11 puts the inverter circuit 4 into a quick charge state, and outputs "H".
The inverter circuit 4 is designed to be trickle charged when a signal is input. (3) When the set time of the timer 12 elapses, the pin of the timer IC is inverted to "L" and the pin is inverted to "H". (4) The "H" signal of the pin controls the quick / trickle switching circuit 11 to bring the inverter circuit 4 into a trickle charged state. That is, when the set time of the timer 12 has elapsed, the secondary battery E is trickle charged. (5) This state is maintained until the push button switch which is the start means 13 is pressed. That is, the secondary battery E is continuously charged by trickle charging. (6) When the push button switch is pressed, the potential of the pin drops to 0V. It is a push button switch,
This is because the pin in the "L" state is connected to the pin. Since the push button switch is temporarily turned on and then turned off, the voltage of the pin rises. Upon detection, the timer IC starts counting and sets the pin to “H” and the pin to “H”.
The "L" signal of the pin controls the quick / trickle switching circuit 11 to rapidly charge the inverter circuit 4. In this state, even if the push button switch as the start means 13 is pressed, The voltage on the pin does not drop and the start signal from the start means 13 is ignored.
This is because the pins are in the “H” state while the timer IC is counting. (8) Therefore, the timer IC starts counting from the first start signal and sets the pin to “H” and the pin to “L” when the set time has elapsed. The "H" signal of the pin switches the inverter circuit 4 to trickle charging by the quick trickle switching circuit 11.

The timer 12 shown in FIG. 2 starts counting when the power is turned on. Therefore, when the charging device is connected to a commercial power source, that is, at the beginning of use, the secondary battery E is rapidly charged for a certain period of time. Therefore, there is a feature that the use state can be set in a short time without first waiting for a long time even when using the apparatus for the first time.

The apparatus shown in FIG. 2 uses a timer IC for the timer 12 and a push button switch for the start means 13. However, the present invention can use, for example, a microcomputer without specifying the timer in this circuit. As the start means, any means that can input a start signal to the timer can be used.

[0019]

According to the charging device of the present invention, even if the secondary battery contained in the electric equipment is completely discharged during use and cannot be used, it can be quickly charged and used again in a short time. Further, an excellent feature of the present invention is that, although the electric equipment that can no longer be used can be charged in a state that can be reused in a short time, the deterioration of the performance of the secondary battery due to overcharging can be effectively prevented. is there. This is because the charging device of the present invention controls the charging time of the secondary battery discharged by the timer.

As described above, the charging device having the inductive inverter circuit of the present invention can charge a secondary battery built in an electric device with a completely waterproof non-contact structure, but when the battery can no longer be used, the charging device is short-circuited. It has a feature that it can be used by quick charging for a long time, and that the secondary battery is prevented from being overcharged and can be used in a truly ideal state. In particular, when the device of the present invention is used for an electric device such as an electric toothbrush, even if the battery is completely discharged, it can be used once with a short quick charge, so that it can be used very conveniently. is there.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a charging apparatus having an inductive inverter circuit according to an embodiment of the present invention.

FIG. 2 is a circuit diagram illustrating an example of a timer.

FIG. 3 is a graph showing a timing chart of the timer shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Charge stand 2 ... Primary side charging circuit 3 ... Secondary side charging circuit 4 ... Inverter circuit 5 ... Switching element 6 ... Induction transformer 7 ... Control circuit 8 ... Induced transformer 9 ... Rectifier circuit 10 ... Waterproof member 11 ... Rapid · Trickle switching circuit 12 · Timer 13 · Start means 14 · Start signal ignoring circuit 15 · Red light emitting diode 16 · Green light emitting diode E · Secondary battery

Claims (1)

(57) [Claims] 1. A charging apparatus having an inductive inverter circuit having the following configuration (a), wherein the charging apparatus has all the configurations of (a) to (f) below. (A) The charging device includes a primary charging circuit (2) built in a charging stand (1) for setting and charging an electric device, and a secondary charging circuit (3) built in the electric device. Prepare. (B) the primary side charging circuit (2) is an inverter circuit (4)
Is provided. (C) the inverter circuit (4) is a switching element
(5) and an induction transformer driven by the switching element (5)
(6) and a control circuit (7) for turning on and off the switching element (5) at a predetermined duty. (D) The secondary-side charging circuit (3) includes an induced transformer (8)
And a rectifier circuit (7). (E) The induced transformer (8) is disposed at a position close to, but not in contact with, the induction transformer (6) of the primary charging circuit (2) via the waterproof member (10). Is joined to. (F) The rectifier circuit (9) is connected between the induced transformer (8) and the secondary battery (E) incorporated in the electric device to rectify the AC output of the induced transformer (8). To the secondary battery (E) of the electrical equipment. (Α) The primary charging circuit controls an inverter circuit to switch between quick charging and trickle charging, a quick / trickle switching circuit, a timer for setting a quick charging time of the quick / trickle switching circuit, and a timer count Start means for starting the, further, the timer,
It has a start signal ignoring circuit that ignores the start signal input from the start means during counting.When the start signal is input from the start means, the timer starts counting, and while the timer is counting, the rapid / trickle switching circuit operates. It is configured to control the inverter circuit to a quick charge state.