JPH0693636B2 - Power supply circuit for portable radio - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power supply circuit in a portable wireless device using a rechargeable battery as a power source, and more particularly to a power supply circuit of the portable wireless device even during charging of the battery. The present invention relates to an improvement for compensating a power supply enough to maintain a transmission / reception operation.

[Technical background of the invention]

FIG. 4 shows a system configuration example of a conventional general portable wireless system, which is composed of a combination of the portable wireless device 1 and the charger 2.

Usually, the portable wireless device 1 has an antenna 10, a press talk switch 11, and a charging terminal 12, and a rechargeable battery (not shown) connected to the charging terminal 12 is used as a power source for transmission and reception. On the other hand, the charger 2 includes an insertion plug 20 and a charging terminal 21, and charges the battery to the charging terminal 21 by stepping down and rectifying, for example, an AC power source (100V) taken from the insertion plug 20. DC voltage for generating is generated. When the current capacity of the battery becomes insufficient, the portable wireless device 1
Is inserted into the charging spot of the charger 2 so that the charging terminals 12 and 21 are brought into contact with each other, and a required charging current is supplied, so that the battery has a sufficient current for transmission / reception operation. It charges to the capacity.

That is, FIG. 5 is a block diagram showing the circuit configuration of the portable wireless system shown in FIG. 4. In the charger 2, an AC power source (100 V) taken from the plug 20 is supplied to the transformer 22. The voltage is stepped down by, is rectified by the diode 23, is smoothed by the capacitor 24, and is further output to the charging terminal 21 through the resistor 25 for determining the charging current. The charging current output from the charging terminal 21 passes through the charging terminal 12 and the reverse connection prevention diode 13 of the portable wireless device 1.
The NiCd battery 14 is supplied with electric power, and the NiCd battery 14 is charged to the capacity level as described above. The charging current in the charging step is usually a current value about 1/10 of the current capacity C of the NiCd battery 14. This is a result of consideration that the life of the NiCd battery 14 is shortened when it is charged with an excessive current, and the charging time is too long when it is charged with an excessive current.

Further, the portable wireless device 1 has a transceiver 15 powered by the NiCd battery 14, and is based on the opening / closing operation of the contact 16 in accordance with the operation of the press talk switch 11 by the operator. Is selected. In both modes, the transceiver 15
It operates by the current consumption from the Cd battery 14, but in the transmission function mode, the output current such as 1 W or 5 W is required, so that the current consumption is the largest (current corresponding to the capacity C of the NiCd battery 14) and continuous transmission is performed. In many cases, it can be operated only for about 1 hour. On the other hand, in the receiving function mode, the current consumption is extremely low (less than 1 / 10C), and it is generally possible to support continuous receiving operation for a long time. Due to the difference in current consumption in the transmission / reception function mode, depending on the remaining capacity of the NiCd battery 14, a state occurs in which the operation in the reception function mode can be performed even if the operation in the transmission function mode cannot be performed. However, in this type of conventional power supply circuit, the NiCd battery 14 is charged when the capacity becomes lower than the capacity for mutual communication in consideration of the communication characteristics of the portable wireless system.

[Problems of background technology]

As described above, in the power supply circuit of the conventional portable wireless device described above, the battery capacity becomes lower than the capacity that can perform the transmission operation, and when the battery is being charged, another portable wireless device or a base station transmits the battery power. Although a receiving operation for a call can be performed, an immediate transmitting operation cannot be performed in response to the call, and mutual communication is not required, so that there is a problem that effective wireless communication cannot be performed.

In addition, in order to enable transmission operation even during this charging,
Another dedicated battery pack has to be provided, and the battery must be charged by itself and used by exchanging it, which causes a problem of complicated structure and high cost.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and has a simple configuration, can perform a transmission operation even during charging, and can contribute to the establishment of effective wireless communication. The purpose is to provide a circuit.

[Outline of Invention]

Therefore, in the present invention, a mode detecting means for detecting whether the portable wireless device is in the transmitting function mode or the non-transmitting function mode, and the mode detecting means when the portable wireless device is in the transmitting function mode. Switching means for switching the current supplied from the charger to a value larger than that in the non-transmission function mode, based on the detection output of It has achieved the above objectives.

Example of Invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, the portable wireless system according to the present invention is made up of a combination of a portable wireless device 100 and a charger 200 as shown in FIG. 1, and has a charging terminal 1002 and 2003, respectively, as a new external configuration. Has been done. The positions where the charging terminals 1002 and 2003 are arranged are determined so as to be in contact with each other when the portable wireless device 100 is inserted into the charging spot of the charger 200 for charging.

Further, the circuit configuration of this portable radio system is shown in FIG. 2, and those having the same functions as those of the circuit parts of the conventional system shown in FIG. 4 are designated by the same reference numerals. . As shown in FIG. 2, the portable wireless device 100 is provided with an inverter 1001 connected between the contact 16 of the press talk switch and the charging terminal 1002 described above as a new circuit configuration. Similarly, the charger 200 includes a resistor 2001 connected in parallel with a resistor 25 for determining the charging current.
And a switch circuit 2002, of which the switch circuit
2002 is connected to the charging terminal 2003 described above.

Normally, the portable wireless device 100 is inserted into the charging spot of the charger 200 when the remaining capacity of the NiCd battery 14 becomes less than or equal to the capacity at which the transmitter / receiver 15 can operate in the transmission function mode. Get charged.

The circuit operation during charging, that is, when the charging terminals 12 and 21, and 1002 and 2003 are connected, will be described in detail below with reference to FIG.

As is well known, the mode selection of the transmission function and the reception function in the transceiver 15 of the portable wireless device 100 is made according to the operation of the press talk switch 11 by the operator. now,
For example, assuming that the press function switch 11 is not pressed and the contact function 16 is in the open state to select the reception function mode, the charger 200 steps down the voltage by the transformer 22 and rectifies it with the diode 23, and then the resistor The charging current having the current value set by 25 is output through the charging terminal 21. On the other hand, on the portable wireless device 1 side, the charging current passes through the charging terminal 12, the reverse connection prevention diode 13, and the NiCd battery.
Power is supplied to 14, and the NiCd battery 14 is charged.

Next, assuming that the transmission function mode is selected by pressing the press talk switch 11 and closing the contact 16 thereof, a signal a indicating that the contact 16 is closed.
Is input to the transceiver 15 and at the same time the inverter 10
It is also input to 01 and switches the output b of the inverter 1001 from "L" to "H". The output b of this inverter 1001 is
It is input to the switch circuit 2002 via the charging terminals 1002 and 2003, and the contacts of the switch circuit 2002 are closed. As a result, in the charger 200, the resistor 2001, the switch circuit 2
A new current supply path composed of 002 is formed, and a predetermined charging current is output to the charging terminal 21 through the current supply path. The charging current in the transmission function mode output from the charging terminal 21 is supplied to the NiCd battery 14 via the charging terminal 12 and the reverse connection prevention diode 13 to charge the NiCd battery 14 to a required capacity level. Here, if the resistance value of the resistor 2001 is set to be smaller than the resistance value of the resistor 25, a larger charging current is obtained in the transmission function mode than when only the resistance 25 is passed (when not in the transmission function mode). Portable radio 1
Can be supplied to.

As an example, the charging capacity C of the NiCd battery 14 is 450mAH (in the case of AA), and the current consumption in the transmission function mode is 500m.
A, assuming that the current consumption in the receiving function mode is 20 mA, the charging current in the non-transmitting function mode will be taken into consideration when the power is turned off by a power switch (not shown). 45m equivalent to 1 / 10C
Set it to A. After that, when the power is turned on by the power switch and the transmitter function mode is entered, the receiver receives 20mA.
Is consumed and the remaining 25 mA is used for charging the NiCd battery 14.

In the transmission function mode (when the switch circuit 2002 is turned on, if the resistance value of the resistor 2001 is selected so that a current of 500 mA flows through the current supply path described above, all the current required for the transmission operation is charged by the charger 200. Can be supplied from the side, said N
The transmission operation can be maintained regardless of the remaining capacity of the iCd battery 14. The charging current in the transmission function mode is preferably set to a current value required for the transmission operation, but it is obvious that a smaller value than this has the effect of maintaining the transmission operation. Further, a current value larger than the current value required during the transmission operation may be set, and charging may be performed in parallel with the remaining current.

FIG. 3 is a block circuit diagram showing another embodiment of the present invention. In the portable wireless device 110, resistors 1101, 1102 and a switch circuit 1103, resistors 1101, which are connected in parallel, are connected.
1104 and a switch circuit 1105 are newly provided, and the configuration of the power switch 1106 is shown together. Also charger 210
Inside the voltage regulator 2101
Is provided.

In FIG. 3, when the power switch 1106 is turned off (opened) while the charging terminals 12 and 21 are connected, the voltage regulator 2101 passes through the resistor 1101 to
A charging current of 45 mA is supplied to charge the NiCd battery 14.

Next, when the power switch 1106 is turned on (closed), the switch circuit 1103 is turned on (closed), and through the resistor 1102,
For example, a current of 20 mA is supplied, and this current supplies the current consumption in the reception function mode.

Further, when the operator presses the press talk switch 11 and the transmission function mode is selected by closing the contact 16, the output of the inverter 1001 is converted to “H” level by the signal indicating the closing of the contact 16. The switch circuit 1105 is turned on (closed) based on the output. In this state, a current of, for example, 480 mA is supplied through the resistor 1104, and is combined with a current of 20 mA supplied through the resistor 1102 as described above, whereby the current consumption in the transmission function mode is covered. In such a configuration, since the circuits for determining the respective supply currents are all configured in the portable wireless device 1, it is not necessary to add a special charging terminal, and the appearance is shown in FIG. Conventional portable radio 1
Is similar to.

In this embodiment, the example in which the charging current switching setting control for compensating the transmission operation during charging is started by monitoring the operations of the press talk switch 11 and the power switch 1106 has been described. The switch is not limited to the above two types. For example,
In a portable wireless device that can perform two-way communication, a slide switch or a hook switch is used instead of a press talk switch as a communication start switch, and it is also possible to monitor the operation of these switches as described above. Can be controlled.

Also, if a lock mechanism is provided that prevents the portable wireless device from being removed when the portable wireless device is inserted into the charger during charging, the entire charger can be lifted for communication. The convenience of can be achieved. At this time, if the power cable or the like is curl-coded, a certain degree of mobility can be secured, and it becomes easier to use.

Further, in addition to the contacts described above, a connector, a plug, or the like can be used for the connection structure during charging of this type of portable wireless device, and the battery serving as the operating power source is NiCd if it is a rechargeable secondary battery. Other than a battery may be used.

〔The invention's effect〕

As described above, according to the power supply circuit in the portable wireless device of the present invention, depending on whether the portable wireless device is in the transmission function mode or the non-transmission function mode, the portable wireless device can be operated from the charger during charging connection. The current value supplied to the wireless device for transmission is switched to a value larger than that in the non-transmission function mode in the transmission function mode, so the remaining capacity of the rechargeable battery decreases, and even when charging is in progress, the switching is performed. With a large value of current, it is possible to perform a transmitting operation as well as a receiving operation, and it has an excellent advantage that extremely effective mutual wireless communication can be established with a simple configuration.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a system configuration of a portable wireless system according to the present invention, FIG. 2 is a block diagram showing a circuit configuration of the portable wireless system shown in FIG. 1, and FIG. FIG. 4 is a block diagram showing a circuit configuration of a portable wireless system according to another embodiment of the invention, FIG. 4 is a conceptual diagram showing a system configuration of a conventional portable wireless system, and FIG. 5 is shown in FIG. It is a block diagram which shows the circuit structure of a portable radio system. 1,100,110 …… Portable radio, 2,200,210 …… Charger, 10
…… Antenna, 11 …… Press talk switch, 12,21,10
02,2003 …… Charging terminal, 13 …… Reverse connection prevention diode, 1
4 …… NiCd battery, 15 …… Transceiver, 16 …… Press talk switch contact, 1001 …… Inverter, 1101,1102,1104,2
5,2001 …… Resistance, 1103,1105,2002 …… Switch circuit, 11
06 …… power switch, 20 …… plug, 22 …… transformer, 23 …… diode, 24 …… capacitor, 2101…
… Power supply regulator.

Claims (1)

[Claims] 1. A power supply circuit in a portable wireless device that charges a battery by connecting a rechargeable battery as a power source and a charger, wherein the portable wireless device is in a transmission function mode or a non-transmission function mode. When the portable wireless device is in the transmission function mode, the current supplied from the charger is changed to the non-transmission function mode based on the detection output of the mode detection means. A power supply circuit in a portable wireless device, comprising a switching means for switching to a value larger than the time.