JPH02132776A - Charging adapter - Google Patents

Abstract

PURPOSE:To prevent the life of the storage battery of a portable wireless apparatus from lowering, by receiving service-conduction signals from the portable wireless apparatus, and controlling the current output of a charging circuit so that the current output corresponding to the service-condition signals. CONSTITUTION:The device includes receiving means 16-19 for receiving from a portable wireless apparatus 30 service-condition signals SS, RS, RL, TS all representative of the service conditions of the portable apparatus 30, signal processing means 41 for processing the service-condition signals SS, RS, RL, TS that are received by the receiving means 16-19 and thereby producing command signals in accordance with the service-condition signals SS, RS, RL, TS, and current controlling means 15 for controlling the current output of a charging circuit 14 in response to the command signals sent from the signal processing means 41. The current output of the charging circuit 14 is controlled in accordance with the service-condition signal SS, RS, RL, TS sent from the portable wireless apparatus 30. Thus the storage battery 33 of the portable wireless apparatus 30 may not be overcharged even when it is repeatedly attached and detached to the and from the portable wireless apparatus 30. It is therefore enabled to prevent the life of storage battery the portable wireless apparatus from being shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a charging adapter having a charging circuit for charging a storage battery attached to a portable wireless device from a charging power source. [Prior technology] Portable type: i! ! The line equipment is equipped with a storage battery. Of course, if this storage battery is fully charged, the portable wireless device can be used as a portable wireless device, but if this portable wireless device is attached to an in-vehicle adapter, it can be used as an in-vehicle wireless device. Yes, if you attach it to a fixed adapter,
It can be used as a fixed wireless device. In this way, when a portable wireless device is used as an in-vehicle wireless device or a fixed wireless device, the storage battery of the portable wireless device can be charged by using the charging circuit built into the in-vehicle adapter or fixed adapter from the charging power source. This is done through Hereinafter, adapters with built-in charging circuits, such as in-vehicle adapters and fixed adapters, will be referred to as charging adapters. Next, with reference to FIG. 4, a conventional charging adapter (in-vehicle adapter) used to use a portable wireless device as an in-vehicle wireless device will be explained. The conventional in-vehicle adapter 10' has an input connector 11 for connecting to an automobile storage battery 20, which is a power source for charging, and an input connection terminal 31 of a portable wireless device 30'' attached to the in-vehicle adapter 10'. and a ground terminal 13 connected to the ground terminal 32 of the portable radio device 30'.
is a storage battery 33 directly connected to the input connection terminal 31;
It has a wireless section 35' connected to the input connection terminal 31 via a power switch 34. The in-vehicle adapter 10' is connected to an automotive storage battery 20 via an input connector 11, and has a charging circuit 14 whose output current is controlled by a current control circuit 15, which will be described later. When the portable wireless device 30' is attached to the in-vehicle adapter 10', that is, when the output connection terminal 12 and the input connection terminal 31 and the ground terminal 13 and the ground terminal 32 are connected, the output current of the charging circuit 14 is as follows. The current is supplied to the storage battery 33 via the current detection circuit 51, the output connection terminal 12, and the input connection terminal 31. Once, portable radio equipment 7! When l30' is attached to vehicle adapter 10', charging circuit 14 has the ability to supply trickle charging current to battery 33. When the current detection circuit 51 detects the output current of the charging circuit 14, it sends a first activation signal to the timer circuit 52. The in-vehicle adapter 10' also has an output connection terminal 1.
2 and the ground terminal 13, in other words, detects (monitors) the terminal voltage of the storage battery 33 when the portable wireless device 30' is attached to the in-vehicle adapter 10', and detects (monitors) this detected (monitored) voltage. It has a voltage detection circuit 53 that sends a second activation signal to the timer circuit 52 when the voltage falls below a preset voltage. The timer circuit 52 is activated by a first activation signal or a second activation signal, and is activated for a predetermined period of time.
The operating signal (logic “1” level signal) is sent to the current control circuit 1.
Send to 5. In response to this operation signal, the current control circuit 15 controls the charging circuit 14 so that the output current (charging current) increases, and rapidly charges the storage battery 33 for a predetermined period of time. Next, the operation of the conventional in-vehicle adapter 10' will be explained. One of the features of the conventional in-vehicle adapter 10' is that each time the portable wireless device 30' is attached to the in-vehicle adapter 10', rapid charging is performed within the limit allowed by the storage battery 33. That is, once the portable wireless device 30' is attached to the in-vehicle adapter 10', as described above,
Since the charging circuit 14 has the ability to supply a trickle charging current to the storage battery 33, even if the storage battery 33 is fully charged, the charging circuit 14 outputs a trickle charging current having a minimum trickle charging current value as an output current. Flow. Therefore, the current detection circuit 51 that has detected this trickle charging current sends a first activation signal to the timer circuit 52 to activate the timer circuit 52. In response to this first activation signal, the timer circuit 52 sends an operation signal to the current control circuit 15 for a predetermined period of time, and the current control circuit F#I15 controls the charging circuit 15 so that the output current (charging current) increases. to quickly charge the storage battery 33 for a predetermined period of time. Note that even if the power switch 34 of the portable wireless device 30' is in the closed state and current consumption flows through the wireless section 35' of the portable wireless device 30', there is no difference in the operation described above. Usually, a nickel-cadmium storage battery for quick charging is used as the storage battery 33, and the nickel-cadmium storage battery can be quickly charged in about 30 minutes. The predetermined time set by the timer circuit 52 is selected to be equal to the quick charging time allowed for the storage battery 33, and after the quick charging time has elapsed from the start of quick charging, the charging circuit 14 outputs trickle charging current as an output current. Flow. Another feature of the conventional in-vehicle adapter 10' is that it monitors the terminal voltage of the storage battery 33 and performs rapid charging in the same way as described above even when this terminal voltage falls below a preset voltage. It is. That is, the portable wireless device 30'
Assume that the power switch 34 of the portable wireless device 30' is turned on while the portable wireless device 30' is attached to the in-vehicle adapter 10', and the wireless unit 35' of the portable wireless device 30' starts to be used. At this time, the radio section 35' of the portable radio device 30' has at least a trickle charging current value depending on various usage states of the portable radio device W30', such as a reception standby state, a reception input state, a transmission output state, etc. The current consumption is several times higher than this trickle charging current value. If this state continues, the storage battery 33 will eventually run out of charge, and the terminal voltage of the storage battery 33 will begin to drop rapidly. When the voltage detection circuit 53 detecting the terminal voltage of the storage battery 33 detects that this terminal voltage has become below a preset voltage, the voltage detection circuit 53 sends a second activation signal to the timer circuit 52. and starts the timer circuit 52. In response to this second activation signal,
The timer circuit 52 operates for a predetermined period of time as described above.
The operation signal is sent to the current control circuit 15, and the current control circuit 1
5 is a charging circuit 1 so that the output current (charging current) increases.
4 to rapidly charge the storage battery 33 for a predetermined period of time.
In this example, turning on and off the engine start switch (not shown) of the vehicle is circuit-wise unrelated to the above-mentioned operation. In this way, the storage battery 33 of the portable wireless device 30' is charged. At the same time, the wireless section 35' of the portable wireless device 30'
Power supply current is also supplied to the portable radio device 30', so that the portable radio device 30' can be used as a vehicle-mounted radio device. In addition, portable radio equipment rIl
30'' as a vehicle-mounted radio device, in reality, a portable antenna (not shown) of the portable radio device 30' is used.
It is necessary to switch from a portable radio device 30' to a vehicle antenna (not shown), or to switch from a portable microphone (not shown) of the portable wireless device 30' to a handheld microphone (not shown). [Problems to be Solved by the Invention] However, the conventional in-vehicle adapter 10' has two drawbacks as described below.

(1) The portable wireless device 30' is the in-vehicle adapter 10'
If the user repeatedly attaches and detaches the portable wireless device 30', the chances of quickly charging the storage battery 33 of the portable wireless device 30' when fully charged increases. For this reason, the storage battery 33 is overcharged, and the life of the storage battery 33 is shortened. (2) tjl! If the band-type wireless device 30' is attached to the vehicle-mounted adapter 10' and used as a vehicle-mounted wireless device for a long time, and the amount of charge in the storage battery 33 of the portable wireless device 30' is low, If the portable radio device 30' is removed from the in-vehicle adapter 10' and used as a portable radio device in its original usage state, the time during which it can be used as a portable radio device will be shortened.

An object of the present invention is to provide a charging adapter that can prevent the storage battery of a portable wireless device from being overcharged even if it is repeatedly connected to and disconnected from the portable wireless device, thereby preventing a reduction in the life of the storage battery. It is about providing.

Another object of the present invention is that even if a portable radio device is used as an in-vehicle radio device or a fixed radio device for a long time and then used as a portable radio device in its original usage state, the portable radio device can be used for a long time. Our goal is to provide a charging adapter that can be used for hours.

[Means to solve the problem]

The charging adapter (in-vehicle adapter or fixed adapter) according to the present invention is a charging adapter having a charging circuit for charging a storage battery attached to a portable wireless device using a charging power source (automobile storage battery or fixed storage battery). Receiving means for receiving a usage status signal representing a usage status of the portable wireless device from the portable wireless device; and processing the usage status signal received by the receiving unit to respond to the usage status signal. and a current control means that receives the command signal from the signal processing means and controls the output current of the charging circuit in response to the command signal. [Operation] Receives a usage status signal from a portable wireless device and controls the output current of the charging circuit to match this usage status signal. [Examples] Examples of the present invention will be described below with reference to the drawings. The difference between an in-vehicle adapter and a fixed adapter is whether an automobile storage battery is used as the charging power source or a fixed storage battery (
Or, the difference is whether a DC power source obtained by rectifying commercial power source with a rectifier is used.There is no essential difference, so the following examples will explain the case where the charging adapter is an in-vehicle adapter. do. Referring to FIG. 1, a charging adapter (in-vehicle adapter) 10 according to a first embodiment of the present invention is connected to an automobile storage battery 20 in the same manner as the conventional in-vehicle adapter 10' shown in FIG. an output connector 12 connected to the input connection terminal 31 of the portable wireless device 30 attached to this in-vehicle adapter 10, and a ground connector 12 connected to the ground terminal 32 of the portable wireless device 30. It has a terminal 13. Further, the portable radio device 30 used in the first embodiment has a storage battery 33 directly connected to the input connection terminal 31, and an input connection terminal, similar to the portable radio device 30' shown in FIG. It has a wireless section 35 connected to the terminal 31 via a power switch 34. As the radio section 35, for example, a radio section of a standard Prestow type portable radio device is used. The portable wireless device 30 further includes a plurality of (four in this embodiment) external connection terminals 36 for extracting to the outside usage status signals representing various usage statuses of the wireless unit 35 sent from the wireless unit 35; 37, 38, and 39. Hereinafter, the external connection terminals 36, 37, 38, and 39 will be referred to as first, second, third, and fourth external connection terminals, respectively. More specifically, the wireless unit 35 sends a power switch 34 to the first external connection terminal 36 indicating whether the power switch 34 of the portable wireless device 30 is in the disconnected (off) state or the connected (on) state. Sends a status signal SS. The power switch state signal SS is at a low level (L) when the power switch 34 is off, and at a high level (H) when the power switch 34 is on.
This is the signal. From the wireless section 35 to the second external connection terminal 37
The signal sent to is a reception status signal RS indicating the reception status of the radio unit 35, whether it is in a reception standby state or a reception input state. The radio section 35 includes a squelch circuit (not shown) which is well known in this field.

When the portable wireless device 30 (wireless unit 35) is not receiving radio waves, the squelch circuit is in operation and the wireless unit 35 is in a reception standby state. When the wireless section 35 is in a reception standby state,
The reception status signal RS is at low level (L). On the other hand, when a radio wave is received, the squelch circuit becomes inactive, and the radio section 35 enters the reception input state. When the radio section 35 is in the receiving input state, the receiving state signal RS is at a high level (H). Incidentally, when the radio section 35 is not receiving radio waves, the squelch circuit can be intentionally deactivated, but in this case, in this embodiment, the radio section 35 is in the reception input state, that is, the reception state signal RS is treated as being at a high level (H).

The radio section 35 sends to the third external connection terminal 38, when the squelch circuit is inactive, that is, when the radio section 35 is in the receiving input state, the received audio output that is received by the radio section 35 and fluctuates from moment to moment after demodulation. A reception level signal RL' representing the magnitude of the level is sent out. This reception level signal RL is, of course,
It is an analog signal.

The signal sent from the wireless section 35 to the fourth external connection terminal 39 is a transmission status signal TS indicating whether or not the wireless section 35 is in a transmitting state. Portable wireless device 30 includes a well-known press/talk switch (not shown). press·
When the talk switch is turned on, the radio unit 35 is in a transmitting state, and when the press/talk switch is turned off, the radio unit 35 is in a non-transmitting state, that is, a reception standby state or a reception input state.

When the radio section 35 is in a transmitting state, the transmitting state signal TS is at a high level (H), and when the radio section 35 is in a non-transmitting state,
The transmission status signal TS is at low level (L).

The in-vehicle adapter 10 of this embodiment has an input connector 1 similar to the conventional in-vehicle adapter 10' shown in FIG.
The charging circuit 14 is connected to the automobile storage battery 20 via the charging circuit 1 and has an output current controlled by a current control circuit 15. Further, the in-vehicle adapter 10 is connected to the portable wireless device 3.
0 is attached to the in-vehicle adapter 10, the first, second, third, and fourth external connection terminals are connected to the first to fourth external connection terminals 36 to 39 of the portable wireless device 30, respectively. 16, 17, 18, and 19. That is, the first to fourth external connection terminals 16 to 19 function as receiving means for receiving usage status signals representing various usage statuses from the portable wireless device 30. When the portable wireless device 30 is attached to the in-vehicle adapter 10, the usage status signals generated from the wireless unit 35 of the portable wireless device 30, that is, the power switch status signal SS, the reception status signal RS, the reception level signal RL, and the transmission status signal TS are supplied to the signal processing circuit 41. The signal processing circuit 41 of this embodiment is composed of a microcomputer (CPU), and operates according to a flowchart shown in FIG. 2, which will be described later. More specifically, the power switch state signal SS is supplied to the signal processing circuit 41 via the first external connection terminal 36 and the first external connection terminal 16. Reception status signal RS
are the second external connection terminal 37 and the second external connection terminal 1
7 to the signal processing circuit 41. Further, the reception level signal RL is sent to the digital-to-analog conversion circuit (
The signal is supplied to the A/D conversion circuit》 42, where it is converted into a digital signal, and then supplied to the signal processing circuit 41. The transmission status signal TS is supplied to the signal processing circuit 41 via the fourth external connection terminal 39 and the fourth external connection terminal 19. The signal processing circuit 41 converts the received usage state signal into
Processing is performed according to a flowchart shown in FIG. 2, which will be described later, and a command signal CO corresponding to the usage state signal is sent to the current control circuit 15. The current control circuit 15 controls the output current of the charging circuit 14 in response to the command signal CO sent from the signal processing circuit 41. Next, referring also to the flowchart shown in FIG.
The operation of the signal processing circuit 41 will be explained. First, the signal processing circuit 41 determines whether the power switch state signal SS is low level (L) or high level (H) (step 1).
01), power switch status signal SS is low level (L)
At this time, the signal processing circuit 41 sends the charging current command signal CS as the command signal CO to the current control circuit FI@15 so that the current value of the output current of the charging circuit 14 becomes the charging current value of the storage battery 33. (Step 102). On the other hand, if the power switch state signal SS is high level (H), the signal processing circuit 41 determines whether the transmission state signal TS is low level (L) or high level (H) (step 1
03). When the transmittal letter signal TS is at high level (H),
The signal processing circuit 41 connects the current control circuit 15 to the charging circuit 1.
The charging current command signal CS is transmitted as the command signal CO so that the current value of the output current of No. 4 is the sum of the charging current value of the storage battery 33 and the power supply current value at the time of transmission output of the portable wireless device 30. Sends a command signal obtained by adding the output power supply current command signal To (step 104). If the transmission state signal TS is low level (L), the signal processing circuit 41 determines whether the reception state signal RS is low level (L) or high. level(
H) (step 105), reception status signal R
When S is at a low level (L), the signal processing circuit 41 informs the current control circuit 15 that the current value of the output current of the charging circuit 14 is equal to the charging current value of the storage battery 33 and the reception standby power supply current of the portable wireless device 30. A command signal obtained by adding the charging current command signal CS and the receiving standby power supply current command signal RO is sent out as the command signal CO so that the current value is the sum of the current value and the receiving state signal (Step 106). If RS is at a high level (H), the signal processing circuit 41 instructs the current control circuit 15 that the current value of the output current of the charging circuit 14 is equal to the charging current value of the storage battery 33 and the fixed power supply at the time of reception input of the portable wireless device 30. The current value (that is, the power supply current value when the receiving input is silent) and the receiving level signal RL are A
The charging current command signal CS and the power supply current command signal RW at the time of reception input are used as the command signal CO so that the current value is the sum of the power supply current value corresponding to the reception input determined by the digital signal converted by the /D conversion circuit 42. (step 107). In this way, the output current of the charging circuit 14 is controlled to be a current that matches the usage state of the portable wireless device 30. Referring to FIG. 3, a charging adapter 10a according to a second embodiment of the present invention is similar to that shown in FIG. 1, except that the signal processing circuit is modified and a voltage stabilizing circuit 43 is added. The charging adapter 10 has the same configuration as the charging adapter 10 according to the first embodiment. Therefore, the signal processing circuit of this embodiment is shown as 41a. As will be discussed in detail later, the first
The signal processing circuit 41 of the second embodiment is constructed of a CPU, whereas the signal processing circuit 41a of the second embodiment is constructed of hardware. Furthermore, the portable radio device 30a used in the second embodiment has the same configuration as the portable radio device 30 used in the first embodiment, except that the radio section is modified. ．． Therefore, the wireless section of this embodiment is shown as 35a. Components having the same configuration as those in the first embodiment are given the same reference numerals, and their description will be omitted. As is well known, in an automobile radio telephone system, when a mobile station including a vehicle-mounted radio device approaches a base station, the transmission of the mobile station is A method is adopted in which the output is reduced in stages. This stepwise reduction of the transmission output is performed based on the transmission output setting reference voltage TR. The wireless unit 35a of the portable wireless device 30a of this embodiment sends this reference voltage TR for setting transmission output to a fourth external connection terminal 39a provided in the portable wireless device 30a. The charging adapter 10a includes a fourth external connection terminal 19a that is connected to a fourth external connection terminal 19a. The voltage stabilizing circuit 43 receives the voltage generated from the automobile storage battery 20 via the input connector 11, and supplies a stabilized output voltage S to the signal processing circuit 41a. Next, the configuration of the signal processing circuit 41a will be explained. In the following description, the portable wireless device 30a is mounted on the vehicle adapter 10a, and the output connection terminal 12, the ground terminal 13, and the first to fourth external connection terminals 16 to 19a of the vehicle adapter 10a are respectively connected to the portable wireless device 30a. The input connection terminal 31, the ground terminal 32, and the first to fourth terminals of the wireless device 30a
It is assumed that the external connection terminals 36 to 39a of the . That is, it is assumed that the portable wireless device 30a is used as a vehicle-mounted wireless device. The signal processing circuit 41a outputs the output voltage V. of the voltage stabilization circuit 43. The first and second resistors R and R2 for dividing the voltage
has. The connection point between the first and second resistors R+ and R2 is connected to the non-inverting input terminal of the differential amplifier IC via a first backflow prevention diode D. The connection point of the first and second resistors R1 and R2 is also connected to the first transistor Q. is connected to the collector of The first transistor Q. The base of Q is connected to the first external connection terminal 16, and the emitter of the first transistor Q is grounded. Therefore, the first transistor Q. A power switch status signal SS is supplied to the base of the wireless unit 35a via first external connection terminals 36 and 16. When the power switch state signal SS is at low level (L), the first transistor Q is in the off state, so the voltage v1 at the connection point of the first and second resistors R1 and R2 is Voltage divided by resistors R and R2 V# xR* / (
R+ +Rt). The voltage V at this time corresponds to the charging current of the storage battery 33. On the other hand, when the power switch state signal SS is at a high level (H), the first transistor Q1 is in the on state, so the voltage v1 at the connection point between the first and second resistors R and R2 is approximately zero. Become.

A second transistor Q2 is connected to the second external connection terminal 17.
The base is connected. In addition, the voltage stabilization circuit 43
The output voltage Vs is supplied to the third and fourth resistors R and R4 via the third transistor Q. Third
The connection point between the fourth resistors R and R4 is connected to the non-inverting input terminal of the differential amplifier IC via a second backflow prevention diode D2. Further, the collector of the second transistor Q2 is connected to the connection point between the third and fourth resistors R3 and R4. The emitter of the second transistor Q2 is grounded. The base of the third transistor Qs is connected to the first external connection terminal 16, and the emitter of the third transistor Q3 is connected to the collector of the fourth transistor Q4. The base of the fourth transistor Q4 is connected to the second external connection terminal 17, and the emitter of the fourth transistor Q4 is connected to the fifth and sixth resistor Rs.
and grounded via R6. The connection point between the fifth and sixth resistors Rs and R6 is connected to the non-inverting input terminal of the differential amplifier IC via a third backflow prevention diode D. Therefore, the radio section 3 is connected to the base of the third transistor Q.
A power switch state signal SS is supplied from 5a through the first external connection terminals 36, 16, and a reception state signal RS is supplied to the bases of the second and fourth transistors Q2 and Q4 through the second external connection terminals 37, 16. 17. @When the source switch state signal SS is at high level (H) and the reception state signal RS is at low level (L), the third transistor Q. is in the on state, the second and fourth transistors Q2
and Q, are in the off state, so the third and fourth resistors R
The voltage v2 at the connection point of 3 and R4 is the voltage divided by the third and fourth resistors R and R, vlI×R 4 /
(equal to R s + R a >.The voltage vI at this time is equal to the charging current of the storage battery 33 and the portable wireless device 32a
The current corresponds to the sum of the power supply current during reception standby. On the other hand, the power switch status signal SS is at high level (H
) and the reception status signal RS is high level (H),
Since the second, third, and fourth transistors Q2, Qs, and Q4 are all in the on state, the third and fourth resistors R
．． The voltage V2 at the connection point between R and R4 becomes almost zero, and the voltage V3 at the connection point between the fifth and sixth resistors Rs and R.
is equal to the voltage VBXR h / (R s + R 4 ) divided by the fifth and sixth resistors Rs and R6. The voltage V at this time corresponds to the current obtained by adding the charging current of the storage battery 33 to the fixed power supply current of the portable wireless device 32a during a call (i.e., the power supply current when the reception output is silent). 35a to the third external connection terminal 38, 1
The received level signal RL sent through the 8 is detected by the detection diode D4, smoothed by the capacitor C, and then divided by the seventh and eighth resistors R7 and R8. The voltage V. divided by the seventh and eighth resistors R7 and R8. (=V.XRs/(R7+R*)) is the fourth backflow prevention da? It is supplied to the non-inverting input terminal of the differential amplifier IC via the ode D4. This voltage v4 is
The current corresponds to the current obtained by adding the charging current of the storage battery 33 to the power supply current corresponding to the received voice input level during a call to the portable wireless device 32a.

Furthermore, a fourth external connection terminal 39a,
The transmission output setting reference voltage TR sent out through 19a is applied to the ninth and tenth resistors R and RI. The pressure is divided by The ninth and tenth resistors R9 and R,. The voltage divided by V, (-VsxR,./( R g + R
+o) ) is supplied to the non-inverting input terminal of the differential amplifier IC via the fifth backflow prevention diode D. This voltage V corresponds to a current obtained by adding a power supply current corresponding to the transmission output of the portable wireless device 32a to the charging current of the storage battery 33.

The output terminal of the differential amplifier IC is connected to the input terminal of the voltage control circuit l5, and is connected to the eleventh and twelfth resistors R1.
, and R. ■It is grounded through. 11th and 1st
The connection point of resistors R11 and R1■ of 2 is the differential amplifier IC.
is connected to the inverting input terminal of Therefore, a non-inverting amplifier is configured by the differential amplifier IC and the eleventh and twelfth resistors Rll and Rl2. Next, the operation of the charging adapter 10a of the second embodiment will be explained with reference to FIG. When the low level (L) power switch state signal SS is supplied to the signal processing circuit liI341a, the first transistor Q. is in the off state, and the output voltage v8 of the voltage stabilizing circuit 43 is applied to the first and second resistors R1.
The voltage divided by R2 and R2 is supplied to the charging circuit 14 via the first backflow prevention diode DI, the differential amplifier IC, and the current control circuit 15. Therefore,
The current value of the output current of the charging circuit 14 is controlled to be the charging current value of the storage battery 33. When the power switch state signal SS is at a high level (H), the first transistor Q+ is turned on, and the voltage v1 becomes approximately zero volts. Thereafter, this state is maintained until the power switch 34 is turned off again, that is, until the power switch status signal SS becomes low level (L). In addition, the power switch 34
is on, that is, when the power switch state signal SS is at a high level (H), the third transistor Qs is also on, and the output voltage v of the voltage stabilizing circuit 43 is applied to the third and fourth resistors R, and R4, and the fourth transistor Q4
through the fifth and sixth resistors Rs and R. is supplied to The high level (H) power switch state signal SS and the low level (L) reception state signal RS are transmitted to the signal processing circuit 41a.
When the second transistor Q2 is turned off, the voltage v2 obtained by dividing the output voltage V1 of the voltage stabilizing circuit 43 by the third and fourth resistors R3 and R4 becomes
The current is supplied to the charging circuit 14 via the second backflow prevention diode D2, the differential amplifier IC, and the current control circuit 15. Therefore, the current value of the output current of the charging circuit 14 is controlled to be the current value obtained by adding the power supply current value of the portable wireless device 30a during reception standby to the charging current value of the storage battery 33. When the reception status signal RS becomes high level (H), that is,
When the reception standby state changes to the communication state, the second transistor Q2 turns on, and the voltage 2 becomes almost zero volts, and the fourth transistor Q4 turns on, and the output voltage of the voltage stabilizing circuit 43 decreases. V8 is connected to the fifth and sixth resistors Rs and R. The voltage v3 divided by
is supplied to the charging circuit 14 via the reverse current prevention diode Ds, the differential amplifier IC, and the current control circuit 15.
Therefore, the current value of the output current of the charging cycle v@14 is the current value obtained by adding the charging current value of the storage battery 33 and the power supply current value during a call of the portable wireless device 30a (the power supply current value when the reception input is silent). It is controlled so that Furthermore, the signal processing circuit 4
The received level signal RL supplied to 1a is detected by a detection diode D6, smoothed by a capacitor C, and then becomes a voltage V, which is divided by the seventh and eighth resistors R7 and R8, and this voltage v4 is supplied to the charging circuit 14 via the fourth backflow prevention diode D4, the differential amplifier IC, and the current control circuit 15. Therefore, the current value of the output current of the charging circuit 14 is controlled to be the current value obtained by adding the charging current value of the storage battery 33 and the power supply current value corresponding to the reception input of the portable wireless device 30a during a call. Furthermore, in the above-mentioned talking state, the reference voltage T for setting the transmission output
The power supply current corresponding to R is added. That is, the transmission output setting reference voltage TR supplied to the signal processing circuit 41a is
The voltage V is divided by the ninth and tenth resistors R9 and R+●, and this voltage V is applied to the fifth backflow prevention diode D. , differential amplifier IC, and current control circuit 1
5 to the charging circuit 14. Therefore, the current value of the output current of the charging circuit 14 is controlled to be the current value obtained by adding the power supply current value corresponding to the transmission output of the portable wireless device 30a during a call to the charging current value of the storage battery 33.
That is, the voltages vs, v4, and vra are added by the differential amplifier IC, and the added output is supplied to the current control circuit 15. Therefore, the current value of the output current of the charging circuit 14 is determined by adding the charging current value of the storage battery 33, the fixed power supply current value of the portable wireless device 30a, the power supply current value corresponding to the receiving input, and the power supply current value corresponding to the transmitting output. The current value is controlled to be the same as the current value. In addition, in the first and second embodiments described above,
When the portable wireless devices 30 and 30a are used as vehicle-mounted wireless devices, in reality, the portable wireless devices 30 and 30a
Switching from a portable antenna (not shown) to an on-vehicle antenna (not shown), and portable wireless devices 30 and 30a
Although it is necessary to switch from a portable microphone (not shown) to a handheld microphone (not shown), these switching means are not shown because they are irrelevant to the gist of the present invention. . Further, in the first and second embodiments described above, the case where the charging adapter is an in-vehicle adapter has been described, but it goes without saying that the present invention can be similarly applied to the case where the charging adapter is a fixed adapter. Furthermore, the usage status signal supplied from the portable wireless device can be in various forms, such as an alternating current signal, a direct current signal, a digital signal, or an analog signal. Therefore, it goes without saying that the signal processing circuit should be configured to match the format of this usage status signal. [Effects of the Invention] As detailed above, according to the present invention, the usage state signal is received from the portable wireless device and the output current of the charging circuit is controlled in accordance with the usage state signal. It is possible to prevent the storage battery of the portable wireless device from being overcharged. This can prevent the life of the storage battery of the portable wireless device from decreasing. In addition, in order to use the portable radio device as a vehicle-mounted radio device or a fixed radio device, the portable radio device may be attached to the charging adapter (vehicle-mounted adapter or fixed adapter) according to the present invention for a long period of time, and then Even when the portable wireless device is removed from the charging adapter and used as a portable wireless device, it can be used as a portable wireless device for a long time.

FIG. 4 is a block diagram showing the structure of a conventional charging adapter (vehicle adapter).

10, 10a... Car cultivation adapter, 11... Input connector, 12... Output terminal, 13... Earth terminal, 14... Charging circuit, 15... Current control circuit, 1
6, 17, 18, 19, 19a...external connection terminal, 2
0...Automotive storage battery, 30, 30a...Portable wireless device, 41, 41a...Signal processing circuit, 42...
Analog-to-digital conversion circuit (A/D conversion circuit), 43
...Voltage stabilization circuit.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a charging adapter (in-vehicle adapter) according to the first embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the signal processing circuit in FIG. 1, and FIG. The figure shows a charging adapter according to a second embodiment of the present invention (in-vehicle A, -10' fourth, and 30'

Claims (1)

[Scope of Claims] 1. In a charging adapter having a charging circuit for charging a storage battery attached to a portable wireless device using a charging power source, the portable wireless device is charged from the portable wireless device. a receiving means for receiving a use state signal representing a use state; a signal processing means for processing the use state signal received by the receiving means and generating a command signal corresponding to the use state signal; and from the signal processing means. A charging adapter comprising current control means for receiving a command signal and controlling an output current of the charging circuit in response to the command signal.