JPH06153420A - Cordless electronic equipment and its charger - Google Patents

Abstract

PURPOSE:To operate cordless electronic equipment normally and lighten a charger whether it is in charge or after completion of charge. CONSTITUTION:In cordless electronic equipment 10, a voltage detecting circuit 14 detects the voltage of an external power terminal 1A, and when the terminal 1A is supplied with voltage, this terminal 1A is connected to the power line of an electronic circuit 11 through a changeover switch means 13. When the terminal 1A is not supplied with voltage, a secondary battery 12 is connected to the power line of the electronic circuit 11 through the switch means 13. In a charger 20, a full charge detecting circuit 31 detects the charge condition of the secondary battery 12. When the full charge of the secondary battery 12 is not detected, a quick charge circuit 24 is put in operation state, and the output current 124 is supplied to the secondary battery 12. When the full charge of the secondary battery 12 is detected, a constant voltage circuit 23 is put in operation state, and the output voltage V23 is supplied to a cordless electronic equipment 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless electronic device and its charging device.

[0002]

2. Description of the Related Art Generally, a mobile phone has a built-in secondary battery as its operating power source. When the secondary battery becomes empty, it is replaced with a charged secondary battery or the telephone is set in a charger to charge the built-in secondary battery.

As the secondary battery, a nickel-cadmium battery having a good discharge characteristic is generally adopted, and its capacity is set so that the current flowing during a call becomes about 1C. Often

[0004]

By the way, when the mobile phone is set in the charger, the mobile phone is normally operated even when the built-in secondary battery is being charged or after the charging is completed. It is desirable to be able to use. However, when the operating voltage is supplied from the charger to the main circuit of the mobile phone, the charger is basically a current source unless the secondary battery of the mobile phone is in the floating charge state. The supplied operating voltage cannot be the specified value. In the case of floating charging, if the charging current is set to a magnitude as high as trickle charging, the power of the secondary battery is consumed by a call, so the secondary battery cannot always be in a fully charged state. In the case of floating charging, if the charging current is set to a level that does not consume the power of the secondary battery, the power handled by the charger becomes too large. It causes problems such as.

The present invention is intended to solve the above problems.

[0006]

Therefore, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, in the cordless electronic device 10, the electronic circuit 11 of the main body and the external power supply terminal 1A are provided. , Voltage detection circuit 14 for detecting the presence / absence of voltage at charging terminal 1B and external power supply terminal 1A
And is controlled by the detection output of this voltage detection circuit 14,
Changeover switch means 1 for selectively connecting the external power supply terminal 1A and the secondary battery 12 to the power supply line of the electronic circuit 11.
3 is provided, and when the voltage V23 is supplied to the external power supply terminal 1A according to the detection output of the voltage detection circuit 14, the external power supply terminal 1A is switched to the changeover switch means 1
3 is connected to the power supply line of the electronic circuit 11, and when the voltage V23 is not supplied to the external power supply terminal 1A, the secondary battery 12 is connected to the power supply line of the electronic circuit 11 through the changeover switch means 13. It is a thing.

Further, in the charging device 20 used in combination with the cordless electronic device 10, the voltage source 21
Voltage circuit 23 for converting the DC output voltage V21 of the battery into an operating voltage of the cordless electronic device 10, a charging circuit 24 for forming a charging current I24 of the secondary battery 12 from the DC output voltage V21 of the voltage source 21, and a secondary battery. 12, a full-charge detection circuit 31 for detecting full-charge, a control circuit 33 for selectively controlling the voltage circuit 23 and the charging circuit 24 in an operating state according to the detection output of the full-charge detection circuit 31, and an external power supply. Terminal 2A
And a charging terminal 2B are provided, and when the full charge of the secondary battery 12 is not detected, the charging circuit 24 is activated and the output current I24 of the charging circuit 24 is supplied to the cordless electronic device 10 through the charging terminal 2B. When the secondary battery 12 is fully charged and the secondary battery 12 is fully charged, the voltage circuit 23 is activated, and the output voltage V23 of the voltage circuit 23 is supplied to the cordless electronic device 10 through the external power supply terminal 2A. It was done like this.

[0008]

The charging circuit 24 and the voltage circuit 23 selectively operate depending on whether the secondary battery 12 is not fully charged or when it is fully charged. Then, when the secondary battery 12 is not in the fully charged state, the secondary battery 12 is charged by the charging circuit 24, and when in the fully charged state, the output voltage of the voltage circuit 23 is replaced by the output voltage of the secondary battery 12. used.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 10 is a mobile phone and 20 is its charger. Then, in the telephone 10, 1A is an external power supply terminal, 1B is a charging terminal, 1C is a common terminal, and 11
Is a main circuit of the telephone, and 12 is a secondary battery for power supply.
The secondary battery 12 is built in the telephone 10, but is detachable from the telephone 10 so that it can be replaced with a charged one when it becomes empty. The battery 12 has a capacity that allows the main body circuit 11 to be used for one hour, for example.

The terminal 1A is connected to the contact A of the switch circuit 13, and the terminal 1B is connected to the switch circuit 1.
3 and the common contact of the switch circuit 13 is connected to the power supply line of the main body circuit 11. The switch circuit 13 can be configured by a transistor or a contact of a relay.

Reference numeral 14 denotes a voltage detection circuit. The detection circuit 14 detects the presence or absence of the voltage at the terminal 1A and controls the switch circuit 13 by the detection output.

On the other hand, in the charger 20, 2A indicates an external power supply terminal, 2B indicates a charging terminal, 2C indicates a common terminal, and these terminals 2A to 2C are terminals 1A to 1C when the telephone 10 is set in the charger 20. 1C contacts each other.

Reference numeral 21 is a power supply circuit, and 23 is a constant voltage circuit. The power supply circuit 21 transforms and rectifies a commercial AC voltage of, for example, 100 V into a predetermined DC voltage V21, and the constant voltage circuit 23 converts the DC voltage V21 into a DC voltage V23 having a predetermined value. It will be transformed. It should be noted that the power supply circuit 21 and the constant voltage circuit 23 only have to have a current capacity corresponding to 1C of the battery 12.

Further, 24 is a quick charging circuit, and 25 is a trickle charging circuit, which forms a charging current I24 for rapidly charging the battery 12 or a charging current I25 for trickle charging from the output voltage V21 of the power supply circuit 21. Is. In this case, as an example, the magnitude of the rapid charging current I24 is set to a magnitude corresponding to 1C of the battery 12, and the magnitude of the trickle charging current I25 is 0.05C to 0.
The size corresponds to 1 C.

The output voltage V21 of the power supply circuit 21 is
The switch circuit 22 selectively supplies the constant voltage circuit 23 and the charging circuit 24. The switch circuit 22
Also, like the switch circuit 13, it can be configured by a contact of a transistor or a relay.

Reference numeral 31 is a full charge detection circuit, 32 is a battery detection switch, and 33 is a charge control circuit. The detection circuit 31 detects the terminal voltage of the battery 12 when the battery 12 is fully charged during charging by monitoring the terminal voltage of the battery 12, for example. The detection output is sent to the charging control circuit 33. Supplied. Further, the detection switch 32 is
When the telephone 10 is set in the charger 20, it is for mechanically detecting whether or not the battery 12 is built in the telephone 10 through the actuator 32A, and the switch output thereof is the charging control through the trigger circuit 34. It is supplied to the circuit 33.

The control circuit 33 then switches the switch circuit 22 according to the outputs of the detection circuit 31 and the switch 32.
Is controlled and the operations of the charging circuits 24 and 25 are controlled.

In such a configuration, the telephone 10 has two
When the telephone 10 is set in the charger 20 when the secondary battery 12 is installed, the switch 32 is turned on through the actuator 32A, and the switch output is supplied to the control circuit 33 through the trigger circuit 34.

Then, the switch circuit 22 is connected to the contact B by the control signal from the control circuit 33. Therefore, since the DC voltage V21 from the power supply circuit 21 is supplied to the quick charging circuit 24 through the switch circuit 22, the quick charging current I24 is output from this charging circuit 24, and this current I24 is output through the terminals 2B and 1B. It is supplied to the battery 12.

At this time, the trickle charging current I25 is output from the trickle charging circuit 25 by the DC voltage V21 from the power supply circuit 21, and this current I25 is also supplied to the battery 12 through the terminals 2B and 1B.

Therefore, the battery 12 has a rapid charging current I
24 and trickle charge current I25, that is, mainly rapid charge current I24 is used for rapid charging.

However, in this case, since the switch circuit 22 does not supply the DC voltage V21 to the constant voltage circuit 23, the constant voltage circuit 23 does not output the DC voltage V23. Then, it is detected by the detection circuit 14 that the voltage V23 is not output, the switch circuit 13 is connected to the contact B by the detection output, and the battery 12 is connected to the power supply line of the main circuit 11 through the switch circuit 13. It

Therefore, when the telephone 10 is used during the quick charge, the quick charge current I24 and the trickle charge current I25 are used.
At the same time that the battery 12 is charged by the battery 12, the voltage of the battery 12 is supplied to the main body circuit 11 through the switch circuit 13, so that the main body circuit 11 operates and the battery 12 is floating-charged by the trickle charge current I25. It will be in the state to be.

When the use of the telephone 10 is stopped, it is rapidly charged again mainly by the rapid charging current I24.

That is, when the telephone 10 is connected to the charger 20, the battery 12 is rapidly charged. If the telephone 10 is used during this charging,
The battery 12 is supplied with a specified operating voltage, and the battery 12 is floating-charged by a trickle-charging current.

Then, the battery 12 is charged, and the battery 1
When charging of 2 is completed, this is detected by the detection circuit 31 through the terminals 1B and 2B, and this detection output is supplied to the control circuit 33.

Then, the switch circuit 22 is connected to the contact A by the control signal from the control circuit 33, and the charging circuit 24 is connected.
Does not output the charging current I24. However, at this time, the trickle charging circuit 25 outputs the trickle charging current I.
25 is output, and this current I25 is output to terminals 2B and 1B.
Since the battery 12 is supplied to the battery 12 through the quick charging circuit 24, when the battery 12 is completely charged by the quick charging circuit 24, the battery 1
2 is trickle charged by the charging circuit 25.

Further, in this case, since the switch circuit 22 is connected to the contact A, the DC voltage V21 from the power supply circuit 21 is supplied to the constant voltage circuit 23 through the switch circuit 22 to output the DC voltage V23, This DC voltage V23
Are supplied to the terminal 1A through the terminal 2A.

Then, the supply of the voltage V23 is detected by the detection circuit 14, and the switch circuit 13 is connected to the contact A by the detection output. Therefore, the voltage V23 supplied to the terminal 1A is supplied to the power supply line of the main body circuit 11 through the switch circuit 13. Therefore, in this case, when the telephone 10 is used, the constant voltage circuit 2
The output voltage V23 of 3 causes the main body circuit 11 to operate, and at this time, the battery 12 is not consumed.

That is, when the charging of the battery 12 is completed, the battery 12 is trickle charged. When the telephone 10 is used at this time, the telephone 10 operates with the output voltage V23 of the constant voltage circuit 23, and the battery 12 is not consumed.

When the telephone 10 is removed from the charger 20, the DC voltage V23 cannot be obtained at the terminal 1A, so that the switch circuit 13 has the contact B by the detection output of the detection circuit 14.
And the voltage of the battery 12 is supplied to the main body circuit 11 through the switch circuit 13. Therefore, in this case, the telephone 10 operates using the battery 12 as a power source.

Further, even if the telephone set 10 is set in the charger 20, if the output voltage V21 cannot be obtained from the power supply circuit 21 due to a power failure or the like, the switch circuit 13 is also provided.
Is connected to the contact B, the telephone 10 can be used with the battery 12 as a power source.

On the other hand, when the telephone 10 is not equipped with the secondary battery 12, when the telephone 10 is set in the charger 20, the switch 32 is turned off through the actuator 32A, and the output of this switch is triggered by the trigger circuit 34.
Through the control circuit 33.

Then, the switch circuit 22 is connected to the contact A by the control signal from the control circuit 33, and the power circuit 21
Is supplied to the constant voltage circuit 23 through the switch circuit 22 to output the DC voltage V23, and the DC voltage V23 is supplied to the terminal 1A through the terminal 2A.

Therefore, as described above, the supply of the voltage V23 to the terminal 1A is detected by the detection circuit 14, the switch circuit 13 is connected to the contact A, and the voltage V23 of the terminal 1A is transmitted through the switch circuit 13 to the main body. It is supplied to the power supply line of the circuit 11. Therefore, in this case, when the telephone 10 is used, the main circuit 11 is operated by the output voltage V23 of the constant voltage circuit 23, and the telephone 10 can be used even if the battery 12 is not attached.

Thus, when the battery 12 is being charged, the telephone 10
If not used, the battery 12 is rapidly charged by a current I24 having a magnitude corresponding to 1C, and when the telephone 10 is used, the battery 12 is floating-charged by a trickle charge current I25 during use. When the battery 12 is completely charged, the battery 12 is trickle-charged. At this time, when the telephone 10 is used, the battery 12 is floating-charged by the trickle-charging current and the telephone 10 is charged. Output voltage V23
And the battery 12 is not consumed.

Therefore, the battery 12 can always be kept fully charged. In addition, the charger 20 uses the battery 12
Can have a current capacity that is sufficient if it can be rapidly charged, that is, the current consumption when the main body circuit 11 is used is 1
A, if the capacity of the battery 12 is 1 Ah, the power supply circuit 21 of the charger 20 can rapidly charge the battery 12 if it has a current capacity of about 1 A. Also, the telephone 10 can be used during the charging.

Since the charger 20 has a current capacity capable of rapidly charging the battery 12, the current design and the thermal design are facilitated and the size can be reduced.

Further, since the battery 12 is always fully charged and whether the battery 12 is used or not is automatically switched according to the presence or absence of the voltage V23 at the terminal 1A of the telephone 10, the user charges the battery 12. The telephone 10 can be used easily without worrying about the state. Furthermore, even when the battery 12 is not present, the telephone 10 can be charged by the charger 2
By setting to 0, the telephone 10 can be used.

In the above description, the full charge detection circuit 3
Although the battery 12 trickle-charges after 1 has detected the completion of charging, the trickle charging circuit 25 may be omitted and charging may be suspended if spontaneous discharge is allowed. In addition, the full charge detection circuit 31 is used for the battery 1
Although the completion of charging is detected from the change in the terminal voltage of No. 2, the completion of charging may be detected from the change in the temperature of the battery 12 by a temperature sensitive element such as a thermistor.

Further, in the above description, the present invention is applied to the mobile phone 10 and the charger 20 thereof, but can be applied to general cordless electronic equipment and its charging device.

[0042]

Since the charger 20 has a current capacity capable of rapidly charging the battery 12, the current design and the thermal design can be facilitated and the size can be reduced. Moreover, the telephone 10 can be used during charging.

Further, the battery 12 is always fully charged, and the use / non-use of the battery 12 is automatically switched according to the presence / absence of the voltage V23 of the terminal 1A of the telephone 10, so that the user charges the battery 12. The telephone 10 can be used easily without worrying about the state. Furthermore, even when the battery 12 is not present, the telephone 10 can be charged by the charger 2
By setting to 0, the telephone 10 can be used.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

[Explanation of symbols]

 10 Mobile Phone 11 Main Circuit 12 Secondary Battery 14 Voltage Detection Circuit 20 Charger 21 Power Supply Circuit 23 Constant Voltage Circuit 24 Quick Charge Circuit 25 Trickle Charge Circuit 31 Full Charge Detection Circuit 32 Battery Detection Switch 33 Charge Control Circuit

Claims (4)

[Claims] 1. A cordless electronic device having a built-in secondary battery, including an electronic circuit of a main body, an external power supply terminal, a charging terminal, a voltage detection circuit for detecting the presence or absence of a voltage at the external power supply terminal, and this voltage detection. A changeover switch means for selectively connecting the external power supply terminal and the secondary battery to the power supply line of the electronic circuit, which is controlled by the detection output of the circuit, and according to the detection output of the voltage detection circuit, When a voltage is supplied to the external power supply terminal, the external power supply terminal is connected to the power supply line of the electronic circuit through the changeover switch means, and when the external power supply terminal is not supplied with the voltage, A cordless electronic device in which a secondary battery is connected to the power supply line of the electronic circuit through the changeover switch means. 2. The charging device used in combination with the cordless electronic device according to claim 1, wherein a voltage circuit for converting a DC output voltage of the voltage source into an operating voltage of the cordless electronic device, and a DC voltage of the voltage source. A charging circuit that forms a charging current for the secondary battery from the output voltage, a full-charge detection circuit that detects full charge of the secondary battery, and the voltage circuit and the charge circuit according to the detection output of the full-charge detection circuit. A control circuit that selectively controls the circuit to an operating state, an external power supply terminal, and a charging terminal. When the full charge of the secondary battery is not detected, the charging circuit is set to the operating state and the charging is performed. The output current of the circuit is supplied to the secondary battery of the cordless electronic device through the charging terminal, and when full charge of the secondary battery is detected, the voltage circuit is activated. Charging device for a cordless electronic device the output voltage of the voltage circuit so as to supply to said cordless electronic device through the external power supply terminal. 3. A charging device used in combination with the cordless electronic device according to claim 1, comprising: a constant voltage circuit for converting a DC output voltage of the voltage source into an operating voltage of the cordless electronic device; A quick charge circuit that forms a quick charge current of the secondary battery from a DC output voltage; a full charge detection circuit that detects full charge of the secondary battery; and control according to the detection output of the full charge detection circuit,
It has a changeover switch means for selectively supplying the DC output voltage of the voltage source to the constant voltage circuit and the quick charging circuit, an external power supply terminal, and a charging terminal, and fully charges the secondary battery. When not detected, the DC output voltage of the voltage source is supplied to the quick charging circuit through the switch means, and the output current of the rapid charging circuit is supplied through the charging terminal to the secondary battery of the cordless electronic device. When the full charge of the secondary battery is detected, the DC output voltage of the voltage source is supplied to the constant voltage circuit through the switch means, and the output voltage of the constant voltage circuit is supplied through the external power supply terminal. A charging device for a cordless electronic device adapted to be supplied to the cordless electronic device. 4. A charging device used in combination with the cordless electronic device according to claim 1, comprising: a constant voltage circuit for converting a DC output voltage of the voltage source into an operating voltage of the cordless electronic device; A rapid charging circuit for forming a rapid charging current of the secondary battery from a DC output voltage; and a trickle charging circuit connected to the voltage source for forming a trickle charging current of the secondary battery from the DC output voltage of the voltage source; , A full charge detection circuit for detecting the full charge of the secondary battery, and control according to the detection output of the full charge detection circuit,
It has a changeover switch means for selectively supplying the DC output voltage of the voltage source to the constant voltage circuit and the quick charging circuit, an external power supply terminal, and a charging terminal, and detects the full charge of the secondary battery. If not, the DC output voltage of the voltage source is supplied to the rapid charging circuit through the switch means, and at least the output current of the rapid charging circuit is supplied through the charging terminal to the secondary battery of the cordless electronic device. When the full charge of the secondary battery is detected, the DC output voltage of the voltage source is supplied to the constant voltage circuit through the switch means, and the output voltage of the constant voltage circuit is supplied through the external power supply terminal. A cord adapted to be supplied to the cordless electronic device and also to supply the output current of the trickle charging circuit to the secondary battery through the charging terminal. Charge the device for an electronic equipment.