JPH03112228A - Secondary battery charger for selective radio call receiver - Google Patents

Abstract

PURPOSE:To prevent a reception message from being dissipated even when a power source switch is turned off for a long time by checking the voltage of a secondary battery in spite of the turn-on/off of the power source switch, and charging the secondary battery with a primary battery or a solar battery when the voltage is less than a prescribed value. CONSTITUTION:Charge control is performed by operating a decoder 105 in spite of the turn-on/off(an internal switch 107 is turned on when it is turned off) of the power source switch 106. When the switch 106 is turned on, and when a secondary battery voltage Vcc2 is less than a charge unnecessary voltage A, charge is started. In other words, a switch 120 for secondary battery charge is turned on via a CPU 110. Next, a secondary battery voltage Vcc1 is compared with a prescribed voltage B. When it is Vcc1>B, the charge with the primary battery 122 to the secondary battery 121 is started with a voltage booster 119 via the CPU 110 while leaving a change-over switch 112 connected to a primary battery 122 side. Also, when it is the primary battery voltage Vcc1<=B, the charge to the secondary battery 121 is started with the booster 119 by switching the switch 112 to a solar battery 108 side via the CPU 110.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is provided with a primary battery and a secondary battery as a power supply source, and notifies the user of a call when receiving a signal including a self-selected call number. The present invention relates to a wireless selective calling receiver that displays a signal message on a display and further stores the message in a memory that retains the stored contents even when the power switch is turned off using the rechargeable battery, and particularly relates to a charging device for the rechargeable battery.

[Conventional technology]

Conventionally, the secondary battery in this type of radio selective calling receiver is charged by the primary battery while the power switch is on. In other words, the voltage of the secondary battery is checked while the power switch is on, and if the voltage of the secondary battery drops below this value, if the voltage of the secondary battery is equal to or higher than the low voltage alarm output voltage, the secondary battery is charged by the primary battery. Met.

[Problem to be solved by the invention] Conventionally, as described above, by charging a secondary battery,
This prevents the loss of received messages stored in a memory operated by a secondary battery, but it has the following problems.

(1) During the period when the power switch is off, charging will not occur even if the voltage of the secondary battery drops below a predetermined value.
If the power switch remains off for a long time, received messages will be lost.

(2) Since the primary battery is used to charge the secondary battery, the life of the primary battery is shortened, causing considerable inconvenience to the person carrying the receiver. In particular, models that consume a large amount of power just by operating the radio signal receiving section, receiving frequency switching section, receiving signal processing section, and receiving content display section, such as a wireless selective calling receiver with a display function that can receive multiple frequencies. This tendency is particularly strong in wireless selective calling receivers.

(3) If the power switch is turned on in a situation where the voltage of the secondary battery is approximately equal to the minimum voltage required to retain the received content in memory, and the voltage of the primary battery is slightly higher than the low voltage alarm output voltage, the primary battery The operation of the wireless section is started and the charging of the secondary battery is also started, but because the voltage of the primary battery is low, either "charging of the secondary battery" or "operation of the radio section" or both may be delayed. There is a risk that it will not work properly,
This may impair the original function of the receiver and may cause the loss of received messages.

The present invention solves these conventional problems, and its purpose is to make it possible to charge a secondary battery regardless of whether the power switch is on or off, and to avoid placing a large load on the primary battery. An object of the present invention is to provide a secondary battery charging device for a wireless selective call receiver that does not require a wireless selective call receiver.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a primary battery and a secondary battery as power supply sources, and provides a call notification when a selected call number in a received signal matches a selected call number assigned to the self in advance. and storing the message included in the received signal in a memory that receives power from the secondary battery and continues to operate during both on and off periods of the power switch, and displays it on a display. In the paging receiver, a secondary battery charging device that charges the secondary battery includes a solar battery and a secondary battery voltage check means that checks the voltage of the secondary battery during both on and off periods of the power switch. , when the primary battery voltage checking means for checking the voltage of the primary battery and the secondary battery voltage checking means detect that the voltage of the secondary battery has decreased to a predetermined value or less,
When the primary battery voltage checking means detects that the voltage of the primary battery is equal to or higher than a predetermined value, the secondary battery is charged with the primary battery, and the voltage of the primary battery is less than the predetermined value. and charging means for charging the secondary battery with the solar cell when the solar cell is detected.

[Function] In the secondary battery charging device of the wireless selective calling receiver of the present invention, the secondary battery voltage check means checks the voltage of the secondary battery during both on and off periods of the power switch, and checks the primary battery voltage. When the means checks the voltage of the primary battery and the secondary battery voltage checking means detects that the voltage of the secondary battery has decreased to a predetermined value or less,
The charging means charges the secondary battery with the primary battery when the primary battery voltage checking means detects that the voltage of the primary battery is equal to or higher than a predetermined value, and the charging means charges the secondary battery with the primary battery, and controls the voltage of the primary battery to a predetermined value. If it is detected that the solar battery is less than 100%, the secondary battery is charged by the solar battery.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The radio selective call receiver of this embodiment includes an antenna 1o1° radio section 102. Waveform shaping circuit 1o3. A PROM (Programmable
Read 0niy Memory) 104, decoder 1o5. Power switch 106. Internal switch 1o7
．． Solar cell 108, L CD (Liquid C
crystal display) 109, CP
U(Central Processing IJni)
t) 110RAM (Memory to Random 8cces) 111, Rechargeable battery selector switch 1
12. Diodes 113 to 117, constant voltage circuit 118,
A voltage booster 119 such as a DC-DC converter, a secondary battery charging switch 120, and a secondary battery 12 for retaining received contents.
1. It is composed of a primary battery 122.

When the power switch 106 is in the off state, the internal switch 107 is in the on state instead, and the voltage of the primary battery 122 is applied to the decoder 105 and the CPU 110 via the internal switch 107. In this state, the wireless unit 102 and the like do not operate, and processing related to charging the secondary battery 121 is performed. Charging of this secondary battery 121 is as follows:
If the primary battery 122 is in a state where it can be used for charging, it is used for charging, and if it is in a state where it is difficult to use, the solar battery 122 is used for charging.
8. Here, solar cell 1
08 can be installed in various places, but in this example, an LCD 1 of a type that transmits external light is used as a display.
09, the radio selective calling receiver can be downsized by mounting the solar cell 108 at the bottom thereof.

Further, when the power switch 106 is in the on state, the voltage of the primary battery 122 is applied to the decoder 105 and CPUll0 via the power switch 106, and the decoder 105 is connected to other circuits, that is, the wireless section 102. All parts such as the waveform shaping circuit 103 are enabled for operation.

In this state, the radio selective calling receiver performs its original operation along with the processing related to charging the secondary battery 121, which will be described later. That is, when the power switch 106 is turned on, a signal received by the antenna 101 is amplified and demodulated by the radio section 102, then waveform-shaped by the waveform shaping circuit 103, and input to the decoder 105. The own calling number stored in the PROM104 and the calling signal included in the received signal are compared, and if they match, a calling notification is performed and the message included in the received signal is transmitted to the CPU 10. LCD 109 under control of CPUI 10
It is displayed on the screen and stored in the RAMI 11. This RAM III receives power directly from the secondary battery 121, and when the power switch 106 is turned on,
It retains its memory contents even if it is turned off.
At any later point in time, the receiver user can display the messages stored in RAMI 11 on the LCD under the control of CPU110.
109.

FIG. 2 is a flowchart showing an example of processing mainly related to charging control of the decoder 105, which operates regardless of whether the power switch 106 is on or off, and FIG. Operation Timing Chart FIG. 4 is an operation timing chart regarding charging control when the power switch 106 is turned off. The configuration and operation related to charging the secondary battery 121 in this embodiment will be described below with reference to FIGS. 1 to 4.

The decoder 105 executes processes 31 to S18 while the power switch 106 is on, and processes 31 to S18 while the power switch 106 is off. S
20 to S34 are executed.

First, in process S], when it is detected that the power switch 106 is turned on, the voltage V c of the primary battery 122 is
Check whether cl is higher than the low voltage alarm output voltage (S2
), it is checked (S3) whether the voltage Vcc2 of the secondary battery 121 exceeds the voltage A at which charging is unnecessary. If the primary battery voltage Vcc2 is not equal to or higher than the low voltage alarm output voltage, a low voltage alarm output is issued (S8), and if the secondary battery voltage Vcc2 is equal to or lower than the voltage A, the process proceeds to step S9.
As long as each voltage Vccl+Vcc2 satisfies the above conditions, the internal X timer and Y timer (the timeout time y of the Y timer is set to twice the timeout time X of the X timer) are used. As shown in the timing chart of FIG. 3(a), the primary battery voltage Vcc1
is checked for a time of ΔL every cycle X, and the secondary battery voltage V
Check cc2 every period y for as long as Δ (32
~S7).

Next, in process S3, the secondary battery voltage vcc2 is changed to the voltage A
When it is detected that the voltage does not exceed the voltage A, it is checked in step S9 whether the secondary battery voltage Vcc2 is equal to the voltage A,
If they are equal, the secondary battery 121 does not need to be charged yet, but will need to be charged in the near future, so the check cycle of the secondary battery voltage Vcc2 is shortened, as shown in FIG. 3(b). Every time the X timer times out, the operation switches to checking the primary battery 122 cc2 in the same way as the primary battery voltage Vccl (S10→311→S2→S3→S
9→510).

Moreover, if it is found in process S9 that the secondary battery voltage V cc2 is less than the voltage A, charging of the secondary battery 121 is started as follows.

1. First, all timers X and Y are reset and switched to the continuous monitoring state shown in FIG. 3(C) in which the primary and secondary battery voltages are continuously detected (S12). Note that at the same time, the secondary battery charging switch 120 is turned on via the CPUll0. Next, in order to check whether the primary battery 122 is outputting a voltage sufficient to charge the secondary battery 121, the primary battery voltage Vccl is compared with a predetermined voltage B (S13). Then, if Vccl>13, it is decided to charge using the primary battery 122, and the rechargeable battery selector switch 112 shown in FIG. Then, charging of the secondary battery 121 by the primary battery 122 is started (S17). Then, after charging is completed, process S1
Return to ('318).

On the other hand, if it is determined in step S13 that Vccl≦B, it is decided to charge using the solar cell 108, and in step S14, the rechargeable battery selector switch 112 is switched to the solar cell 108 side via the CPUll0. Then, the voltage booster 119 is operated via the CPU 10 to start charging the secondary battery 121 by the solar cell 108 (S17), and after charging is completed, the process returns to step S1 (S18).

Note that while the secondary battery 121 is being charged, the output terminal voltage of the constant voltage circuit 118 is constantly monitored, and if the output terminal voltage is less than a predetermined voltage or becomes less than halfway, a low voltage alarm is output. The user is prompted to replace the battery (S15, 516).

The above is the charging operation while the power switch 106 is on, but charging while the power switch 106 is off is performed as follows.

First, when it is detected in process S1 that the power switch 106 is turned off, the process proceeds to process S20, and the primary battery 12 is turned off.
It is checked whether the voltage Vccl of No. 2 is higher than or equal to the low voltage alarm output voltage. If it is less than the low voltage alarm output voltage, a low voltage alarm is output (S21), but if it is more than that, check whether the voltage ■cc2 of the secondary battery 121 exceeds the voltage A that does not require charging. Figure 4 (a) using a timer
) is performed every cycle y (322 to 524). Note that Z in FIG. 4(a) is the voltage check period immediately before the power switch is turned off, and 2≦X. Then, processing S22
When it is detected by checking that the secondary battery voltage Vcc2 does not exceed the voltage A, it is checked in step S25 whether the secondary battery voltage Vcc2 is equal to the voltage A, and if it is, the secondary battery 121 There is no need to charge it yet, but it will be necessary in the near future. Therefore, as shown in Fig. 4(b), the check period of the secondary battery voltage Vcc2 is shortened to X, and the primary battery voltage ■ Also check cc1 (S26→S27→S20→S22→S25→
526).

Further, if it is found that the secondary battery voltage Vcc2 is less than the voltage A in the process S25, the power switch 106
In the same way as when turning on the secondary battery 121, the primary battery 122 or the solar battery 10 is switched on depending on the value of the primary battery voltage Vccl.
Charging is performed by 8 (328-534). After charging, the process returns to step S1. Note that FIG. 4(C) shows an operation timing chart at that time.

〔Effect of the invention〕

As described above, the secondary battery charging device for a wireless selective calling receiver of the present invention checks the voltage of the secondary battery regardless of whether the power switch is on or off.

When the voltage drops below a predetermined value, the secondary battery is charged by the primary battery or solar battery depending on the voltage of the primary battery. Charging is carried out even when the power has dropped below 200 kHz, and even if the power switch remains off for a long period of time, the loss of received messages is prevented as much as possible.

(2) Since charging of the secondary battery is shared between the primary battery and the solar cell, the life of the primary battery can be extended.

(3) Even if the power switch is turned on when the voltage of the primary battery is low, the secondary battery is charged by the solar cell, so the load on the primary battery is reduced by that amount compared to before. The normal operation of the radio section can be guaranteed, and the loss of received messages can be prevented without impairing the original functions of the receiver.

5 Effects such as this can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing an example of processing for charging control of the decoder 105, and the third section is an operation timing for charging control when the power switch 106 is turned on. The chart and FIG. 4 are operation timing charts related to charging control when the power switch 106 is turned off. In the figure, 101... antenna 102... radio section 103... waveform shaping circuit 104... FROM 105... decoder 106... power switch 107... internal switch 108..., solar cell 109... LCD 110... CPU 6 111... RAM 112... Rechargeable battery changeover switch 113-117... Diode 118... Constant voltage circuit 119... Voltage R pressure regulator 120... Two Secondary battery charging switch 121...Secondary battery 122...Primary battery

Claims (1)

[Scope of Claims] It is equipped with a primary battery and a secondary battery as a power supply source, performs a call notification when a selective call number in a received signal matches a selective call number assigned to itself in advance, and The message contained in the received signal is supplied with power from the secondary battery, and the power switch is turned on.
In a wireless selective calling receiver that is stored in a memory and displayed on a display that continues to operate during both periods when the power switch is off, a solar battery and a secondary battery that checks the voltage of the secondary battery during both periods when the power switch is on and off are provided. a secondary battery voltage checking means; a primary battery voltage checking means for checking the voltage of the primary battery; and when it is detected by the secondary battery voltage checking means that the voltage of the secondary battery has fallen below a predetermined value; When the primary battery voltage checking means detects that the voltage of the primary battery is equal to or higher than a predetermined value, the secondary battery is charged with the primary battery, and the voltage of the primary battery is less than the predetermined value. 1. A secondary battery charging device for a wireless selective call receiver, comprising: a charging means for charging the secondary battery with the solar cell when the solar cell is detected.