JPH02151134A - portable radio device - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] (Summary) Regarding a portable radio device that operates using a secondary battery as a power source, the standby function prevents discharge of the secondary battery when it becomes impossible to charge the secondary battery in the state. A wireless transmitter/receiver unit, a removable secondary battery pack that supplies operating power to the wireless transmitter/receiver unit, and a charger, the charger configured to connect charging output terminals of positive and negative polarity. The secondary battery pack has a first resistor connected to the secondary battery pack, the secondary battery pack has a diode connected between positive polarity input and output terminals with a polarity for charging the secondary battery, and the wireless transmitting/receiving unit has a first resistor connected to the secondary battery pack. a second resistor connected between the terminals connected to the positive charging input terminal and the positive power output terminal of the battery pack and having a larger value than the first resistor; , detects a voltage corresponding to a connection point between the first resistor and the second resistor, and turns off a switch circuit (8) between the transmitting/receiving circuit and the secondary battery pack when the charger is abnormal. The control circuit is configured to include a control circuit for controlling the

[Industrial application field]

The present invention relates to a portable wireless device that operates using a secondary battery as a power source.

Portable wireless devices such as mobile phones use, for example, as a power source.
It is common to have a secondary battery pack in which a plurality of secondary batteries such as NiCd batteries are combined, and to charge the battery with a charger when the battery is not carried. That is, it is necessary to charge the secondary battery when the device is not being carried so that it can be carried at any time and communicated while moving.

[Conventional technology]

Mobile phones use a system similar to the car phone system,
It is possible to make calls to subscribers accommodated in the general public network even while on the move. Such mobile phones are generally configured with a removable secondary battery pack, and when the secondary battery pack is discharged and cannot be used, or is broken and cannot be used, other secondary battery packs can be used. It is configured so that it can be used for mobile phone calls by replacing it with a battery pack or the like.

In addition, when the mobile phone is not carried, the secondary battery pack is charged by the charger by placing the mobile phone on the charger.
It includes a transformer that steps down the voltage to a voltage corresponding to the voltage of the secondary battery pack such as V, a rectifying and smoothing circuit that converts it to DC voltage, and the like. Even when the secondary battery is being charged, the user can enter a standby state in which he or she can respond to incoming calls.

[Problem to be solved by the invention]

When the owner of the mobile phone returns to the office or home, place the mobile phone on the charger as described above, charge the secondary battery, and leave the phone with the mobile phone at any time. I will prepare so that I can do it. At that time, the power switch of the transmitter/receiver section is turned on, and the mobile phone can be placed in a standby state. In such a standby state, the power consumption is lower than that during a call, but it still consumes power. Therefore, if a state occurs in which the secondary battery cannot be charged due to a power outage in the commercial power source or a fault in the charger, the secondary battery will gradually discharge to supply the standby current, and will eventually reach a completely discharged state. When you try to go out with your mobile phone, you end up not being able to use it.

An object of the present invention is to prevent the secondary battery from discharging when it becomes impossible to charge the secondary battery in the standby state.

[Means to solve the problem]

The portable wireless device of the present invention prevents the secondary battery from being exhausted by forcibly turning off the power switch of the wireless transmitting/receiving unit when the secondary battery is in a charging state and cannot be charged due to a power outage or the like. , will be explained with reference to FIG.

A wireless transmitter/receiver 1, a removable secondary battery pack 2 that supplies operating power to the wireless transmitter/receiver 1, and a charger 3. The secondary battery pack 2 includes a first resistor 4 connected between charging output terminals of positive and negative polarities for connection, and a diode connected with a polarity for charging the secondary battery 5 between input and output terminals of positive polarity. 6, and the wireless transmitter/receiver l is connected between the terminals connected to the positive charging input terminal and the positive power output terminal of the secondary battery pack 2, and is larger than the first resistor 4. value of the second resistor 9, the secondary battery pack 2 and the charger 3
When charging the secondary battery 5 by connecting the It has a control circuit 10 that turns off a switch circuit 8 between the battery pack 2 and the transmitting/receiving circuit 7.

[Effect]

Every time a secondary battery pack 2 is attached to the wireless transmitter/receiver 1 , power is supplied from the secondary battery 5 to the transmitter/receiver circuit 7 via the switch circuit 8 . Also, charger 3 and secondary battery pack 2
When the secondary battery 5 is charged by connecting the wireless transmitter/receiver 1 to the standby state, the control circuit 10 receives the output of the charger 3 when the charger 3 is operating normally. Charging voltage is input. When the commercial power supply of the charger 3 is interrupted or a failure occurs in the charging circuit of the charger 3 and the charging output voltage becomes zero, the second resistor 9 and the first resistor 4 reduce the charge of the secondary battery 5. Since the output voltage is divided and becomes lower than normal, the control circuit 10 turns off the switch circuit 8.

Also, when the connection with the charger 3 is disconnected, the control circuit 10 has a second
The output voltage of the secondary battery 5 is applied through the resistor 9, and the voltage is the same as the normal voltage, so the control circuit 10
turns on the switch circuit 8. Therefore, when the secondary battery 5 cannot be charged, consumption of the secondary battery 5 can be prevented, and when the device is portable, power can be supplied from the secondary battery 5 to the transmitting/receiving circuit 7 to enable mobile communication.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, and 11.1
Reference numeral 2.13 indicates a wireless transmitting/receiving unit, a secondary battery bag, and a charger corresponding to numerals 1 and 2.3 in FIG. Also 14 is commercial 1
Adapter connected to 00v power supply, 15 is charging circuit, 16
is a first resistor, 17 is a charging switch, 18.19 is a charging output terminal with positive and negative polarity, 20.21 is a charging input terminal, 22
is a secondary battery, 23 is a diode, 24.25 is a power output terminal, 26 is a detection output terminal, 27.28 is a power input terminal, 29 is a detection input terminal, 30 is a fuse, 31 is a second resistor, 32 is a Zener diode, 33 is a capacitor,
34.36 is a transistor, 35 is a resistor, 37 is a transmitting/receiving circuit, 38 is an antenna, 39.40 is a comparison circuit, 41 is an OR circuit, 42 is a flip-flop, 43 is a power switch, 44 is a resistor, and VCC is a power supply voltage. be.

The adapter 14 includes a transformer, a rectifier circuit, a smoothing capacitor, etc. that converts the commercial 100V voltage into a voltage corresponding to the voltage of the secondary battery Pasokue 2, and the charger 13 includes a charging circuit including a constant current drive circuit, a timer, etc. 15 to charging switch 1
It has a configuration in which a voltage is applied from an adapter 14 through a terminal 7, and a first resistor 16 connected between charge output terminals 18 and 19 of positive and negative polarities. For example, charger 13
Wireless transmitting/receiving unit 11 with a secondary battery bag 12 attached on top of the
By placing the secondary battery bag 12 and charger 13
At the same time, the operating piece of the charging switch 17 is pressed to turn on, and a stepped-down DC voltage is applied from the adapter 14 to the charging circuit 15.

Further, the secondary battery bag 12 is a secondary battery 2 such as a NiCd battery.
2, a polarity diode 23 connected between the positive polarity charging input terminal 20 and the positive polarity power output terminal 24 to charge the secondary battery 22, and the negative polarity charging input terminal 21 and the negative polarity diode 23. The positive polarity power output terminal 25 is directly connected, and the detection output terminal 26 and the positive detection input terminal 29 are directly connected. Further, as described above, the diode 23 is charged by applying the output voltage of the charger 13 to the secondary battery 22, and when the charger 13 is disconnected, the diode 23 is connected to the positive charging input terminal 20 and the detection output. This is to prevent the voltage of the secondary battery 22 from appearing at the terminal 26.

Furthermore, the wireless transmitter/receiver 11 includes transistors 34 and 36 that constitute the switch circuit 8 (see FIG. 1) and the control circuit 10.
Comparing circuits 39, 40 and flip-flop 42 that constitute
etc., and a second resistor 31, a fuse 30 interrupts overcurrent due to an internal short circuit, and a Zener diode 3
2 protects from overvoltage, and capacitor 33 reduces peak voltage and removes noise components.

When the secondary battery bag 12 is attached to the wireless transmitter/receiver 11,
A power supply voltage VCC of +5V or the like is formed by a configuration not shown, and the voltage VCC ("1") is applied to the data terminal of the flip-flop 42. Further, the clock terminal C of the flip-flop 42 is grounded via a resistor 44. When the power switch 43 is turned on, the power supply voltage ■6 is applied to the clock terminal C of the flip-flop 42. (“1”)
is added, and the output terminal Q of the flip-flop 42 becomes "1" due to the rise thereof.Thereby, the transistors 36 and 34 are turned on, and operating power for the transmitting/receiving circuit 37 is supplied from the secondary battery pack 12.

The comparison circuit 39 also includes a second resistor 31 and a detection input terminal 29.
The comparison circuit 40 is connected to the connection point of the transistor 3
It is connected to the emitter of 4.

If the charger 13 is outputting a normal charging voltage when the charger 13 is connected to the secondary battery pack 12, the comparison circuit 39 receives the charging output voltage, If a normal charging voltage is not output, a voltage obtained by dividing the output voltage of the secondary battery pack 12 at the connection point between the first resistor 16 and the second resistor 31 is input. For example, the first resistor 16 is IOKΩ, the second
When the resistor 31 is set to 100 Ω, when the output voltage of the charger 13 is zero, a voltage 1/11 of the output voltage of the secondary battery 22 is input to the comparator circuit 39. Therefore, since the voltage input to the comparator circuit 39 is lower in abnormal conditions compared to normal conditions, the comparison output signal is set to "1". This comparison output signal is applied to the reset terminal R of the flip-flop 42 via the OR circuit 41.

Furthermore, when the output voltage of the secondary battery 22 of the secondary battery pack 12 decreases, the charging output voltage is applied to the comparator circuit 39 when the charging output voltage of the charger 13 is normal. Although the comparison output signal remains "0", since a voltage lower than that in the normal state is input to the comparison circuit 40, the comparison output signal is set to "1". This comparison output signal is applied to the reset terminal R of the flip-flop 42 via the OR circuit 41. Further, when the output voltage of the secondary battery 22 decreases when it is disconnected from the charger 13, both comparison output signals from the comparison circuits 39 and 40 become "1".

When flip-flop 42 is reset, the transition
The stars 36 and 34 are turned off, and power supply from the secondary battery pack 12 to the transmitting/receiving circuit 37 is stopped. Therefore, when charging the secondary battery 22, if the charging output voltage drops to zero due to a power outage or the like, the transistor 34 is turned off, power supply to the transmitter/receiver circuit 37 in the standby state is stopped, and the secondary battery 22 consumption can be prevented. And charger 1
When carried separately from 3, the output voltage of the secondary battery pack 12 is input to the comparator circuit 39 via the second resistor 31, so when the power switch 43 is turned on, the flip-flop 42 is inverted. Since the transistor 34 is turned on, power can be supplied to the transmitter/receiver circuit 37 from the secondary battery pack 12 and the standby state can be established.

FIG. 3 is an explanatory diagram of the operation of the embodiment of the present invention, in which (8) indicates the output voltage of the charger 13, (bl indicates the operation of the transistor 34 constituting the switch circuit, and period A1 indicates the charging period, and A2 is the charging voltage drop period, A3 is the charger disconnection period,
A4 is a charging period, and A5 is a charger disconnection period. During the charging period AI, the secondary battery 22 is charged by the output voltage of the charger 12. Then, when the power switch 43 is turned on at time t1, the flip-flop 42 is set, the transistor 34 is turned on, the transmitting/receiving circuit 37 is supplied with power from the secondary battery pack 12, and the standby state is set. becomes.

When the output voltage of the charger 13 decreases at time t2 due to a power outage or the like, the flip-flop 42 is reset and the transistor 34 is turned off. That is, since the secondary battery 22 is not charged, the transistor 34 is forcibly turned off to prevent the secondary battery 22 from being exhausted.

Even if the power outage is restored at time t3 and the output voltage of the charger 13 is restored, or even if the charger 13 is disconnected, the flip-flop 42 remains in the reset state, so the transistor 34
continues in the off state, and the transmitter/receiver circuit 37 does not operate. Then, when the power switch 43 is turned on at time t4, the flip-flop 42 is set and the transistor 34 is turned on, power is supplied from the secondary battery pack 12 to the transmitting/receiving circuit 37, and the standby mode is entered.

Furthermore, even when the flip-flop 42 is connected to the charger 13 for charging at time t5, the flip-flop 42 is not reset, and even when the charger I3 is disconnected at the time t6, the flip-flop 42 is not reset and connected, so the transistor 34 is not reset. will remain in the on state for m consecutive times.

Furthermore, even if the output voltage of the charger 13 has decreased as shown by the dotted line at time t3, if the power switch 43 is turned on at time t4 after disconnecting from the charger 13, the transistor 34 will be turned on. Power is then supplied from the secondary battery bag 12 to the transmitting/receiving circuit 37.

In the above-described embodiment, the comparator circuit 39.40 detects a voltage drop and resets the flip-flop 42, and the comparison reference voltage of the comparator circuit 39.40 is based on the output voltage of the secondary battery 22 and the charging voltage. This is set in accordance with the charging output voltage of the device 13, etc. It is also possible to configure a configuration in which a microprocessor or the like is provided to convert the input voltage to the comparator circuit 39, 40 into a digital signal and perform comparison processing by the microprocessor, and the output signal of the microprocessor can be used to control the switch circuit. It is also possible to adopt a configuration in which the on/off state of the transistor 36 is controlled. Further, although the switch circuit is shown as being composed of bipolar transistors, it is of course possible to be composed of field effect transistors and the like. Resistance 16 of writing 1
can also be used as the output stabilizing resistor of the charging circuit 15.

〔Effect of the invention〕

As explained above, in the present invention, when the secondary battery bag 2 is connected to the charger 3 and the secondary battery 5 is being charged,
When the output voltage of the charger 3 decreases due to a power outage or the like, standby power is supplied from the secondary battery 5 to the wireless transmitting/receiving unit 1, and the secondary battery 5 is consumed. Therefore, when charging is being performed normally, the output voltage of the charger 3 is manually controlled, and when the output voltage decreases, the output voltage of the secondary battery 5 is changed between the second resistor 9 and the first resistor 4. The voltage divided by the voltage is input to the control circuit IO to detect charging abnormality, and the switch circuit 8 between the transmitting and receiving circuit 7 is forcibly turned off. This is to cut off the supply of In2 and stop the consumption of the secondary battery 5.

As a result, when the secondary battery 5 is disconnected from the charger 3 and moved, power can be supplied from the secondary battery 5 to the transmitting/receiving circuit 7 since the secondary battery 5 is not exhausted. Portable wireless communication can be performed without any exchange.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of the present invention. ■ is the wireless transmitter/receiver, 2 is the secondary battery pack, 3 is the charger,
4 is a first resistor, 5 is a secondary battery, 6 is a diode, 7 is a transmitting/receiving circuit, 8 is a switch circuit, 9 is a second resistor, 10
is the control circuit. Explanation of the principle of the present invention Figure 1 3 t4

Claims (1)

[Claims] A wireless transmitter/receiver (1) and a removable secondary battery pack (2) that supplies operating power to the wireless transmitter/receiver (1).
) and a charger (3), the charger (3) having a first resistor (4) connected between charging output terminals of positive and negative polarity, and the secondary battery pack (2) , a diode (
6), the wireless transmitter/receiver (1) includes the secondary battery pack (2).
a second resistor (9) connected between the terminals connected to the positive charging input terminal and the positive power output terminal of the battery, and having a larger value than the first resistor (4); Pack (2
), a voltage corresponding to the connection point between the first resistor (4) and the second resistor (9) is detected, and when the charger (3) is abnormal, the transmission/reception circuit (7) and the A portable wireless device characterized by having a control circuit (10) that turns off a switch circuit (8) between the secondary battery pack (2) and the secondary battery pack (2).