JPH0258936A - Selective call receiver - 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 OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to a selective call receiver equipped with battery saving means.

(Prior Art) FIG. 3 shows an example of the configuration of a conventionally used selective call receiver. This receiver receives a selective call signal transmitted from a base station (not shown) via an antenna 1 in a radio section 2, demodulates the signal, and pre-assembles an individual number code into an I/O signal.
The controller 3 compares it with the individual number code of the own machine, which is stored in the D-ROM 4. When the two codes match, the control section 3 supplies a sound signal to the speaker 6 via the drive circuit 5, thereby causing the speaker 6 to generate a ringing tone and notifying the holder that a call has occurred. At the same time, the message information inserted in the selective call signal is stored in the message memory 7, decoded, and displayed on the display 8.
It is to be displayed on the Furthermore, reference numeral 9 denotes an operation input section provided with a plurality of operation switches, and according to the operation of this operation input section, the control section 3 can stop the ringing tone or read message information from the message memory 7 while waiting for reception. Display on display 8.

By the way, this type of selective call receiver generally saves battery. Battery saving focuses on the fact that the selective call signal sent from the base station to the own machine is inserted only into a predetermined group in one frame, and The radio section 2 is operated for reception only during the reception period, and during other periods, the power supply to the radio section 2 is cut off and placed in a reception standby state. In this way, in the wireless section 2, 1
Since power is consumed only during the reception period of the group to which the own device belongs in the frame, power consumption can be significantly reduced compared to the case where the radio section 2 is constantly operating.
This can extend the life of the battery.

However, in such a conventional selective call receiver, although the power consumption by the radio section 2 can certainly be reduced by the battery saving described above, other circuit sections, especially the control section 3, are kept in a constant operating state. Therefore, the power consumption by these circuit parts is large, and therefore the battery consumption is still large.

(Problems to be Solved by the Invention) As described above, conventional selective call receivers still consume a large amount of power as a receiver due to power consumption in circuit sections other than the radio section, resulting in a short battery life. The present invention focuses on this point and makes it possible to reduce power consumption in circuit sections other than the radio section, thereby further reducing power consumption of the entire receiver and extending battery life. The purpose is to provide a selective calling receiver.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, the control unit also stops its control operation in the reception standby state, and in this state, the control unit has a low Taking into consideration the fact that it is only necessary to supply the power supply voltage, a separately excited voltage conversion circuit and a clock generation circuit that supplies a switching clock to the voltage conversion circuit are provided, and the first power supply is used during reception operation of the wireless section. In addition to a voltage generation section that generates a voltage and supplies it to the control section, a voltage detection circuit that detects a power supply voltage value supplied from the voltage generation section to the control section and a clock supply to the voltage conversion circuit are turned on and off. A power supply control unit equipped with a switch circuit is provided, and the power supply control unit supplies the power to the voltage conversion circuit by the switch circuit while monitoring the power supply voltage value by the voltage detection circuit while the radio unit is in reception standby mode. A clock is supplied intermittently, whereby a predetermined second power supply voltage lower than the first power supply voltage is generated from the voltage generation section and supplied to the control section.

(Function) As a result, the power consumed by the control unit during reception standby operation is due to the second power supply voltage, so compared to the conventional case where the same first power supply voltage as during reception operation was always supplied. In comparison, the power consumption in the reception standby state can be further reduced, thereby making it possible to further extend the life of the battery.

(Embodiment) FIG. 1 shows the main part configuration of a selective call receiver in an embodiment of the present invention. This receiver includes a CPUl0 as a control unit, a power source 20 consisting of a battery, and a power source 20.
It has a voltage generation circuit 30 that generates a predetermined operating voltage from an output voltage of 0, and further has a voltage supply control circuit 40.

First of all, the voltage generation circuit 30 is a voltage converter (DC/
DC) 31, and a clock generator (CLKG) that supplies a clock for switching operation to the voltage converter 31.
) 32 and the voltage output from the voltage converter 31 as C.
It is composed of a voltage limiter 33 that limits the first operating voltage (voltage value VH) necessary for the control operation of the P U 10,
This first operating voltage Vll is supplied to the CPU10.

Further, the voltage supply control circuit 40 is connected to the clock generator 32
and the voltage converter 31, a switch control circuit (SW-CONT) 42 that controls opening and closing of this switch 41, and a switch 41 provided in the clock supply path between the voltage converter 31 and the voltage converter 31; A voltage detection circuit (VL-DET) that monitors whether the operating voltage supplied to the circuit is at a predetermined second operating voltage (voltage value VL).
43 and a hold release circuit 44. Among these, the hold release circuit 44 is composed of, for example, a timer,
A hold release signal is generated to the CPU 10 at a certain time t1 before returning to the reception operation state in the reception standby state.

Note that when CPU10 puts the radio section into a reception standby state by battery saving control, it also shifts to a hold state in which control operations are stopped, but it is configured to generate a down signal at the time it shifts to this hold state. has been done. Further, the second operating voltage (VL) is
It is set to the lowest voltage value necessary for the memory retention operation of the internal memory in the 0 hold state.

Next, the operation of the above configuration will be explained with reference to FIG. First, during the reception period of the group to which the device belongs in one frame transmitted from the base station, the wireless section is in a receiving operation state, and the CPU 10 is in a control operation state, that is, in a non-hold state. In this state, switch 4
1 is in the open state, the clock is supplied from the clock generator 32 to the voltage converter 31, and the voltage converter 31 is in the operating state. A first operating voltage whose voltage value is limited to V I+ by a voltage limiter 33 is supplied.

Therefore, at this time, the CPU 10 can reliably execute the individual number code verification operation, the call notification control operation when a call to 0 machine occurs, the message display control operation, etc.

Now, when the reception period of the group to which the machine belongs ends, CPU10 cuts off the power supply path to the radio section at this point and puts the radio section into the reception standby state, and then as shown in Fig. 2. After outputting a down signal, it shifts to the hold state. Then, at this point, the switch 41 becomes open under the control of the switch control circuit 42.
As a result, the clock supply to the voltage converter 31 is interrupted, and the voltage converter 31 becomes inactive. Therefore, the operating voltage supplied from the voltage generation circuit 30 to the CPU10 is the second
It gradually decreases as shown in the figure. Then, when the voltage value drops below the second operating voltage VL, this is detected by the voltage detection circuit 43 and transmitted to the switch control circuit 42, and as a result, the switch 41 is closed and the voltage converter 31
The clock supply to is resumed. Therefore, the voltage converter 31 becomes operational again, the operating voltage stops decreasing, and the voltage value starts increasing. However, when this operating voltage value exceeds the second operating voltage value vL, this is detected by the voltage detection circuit 43 and the switch 41 is opened by the switch control circuit 42, whereby the voltage converter 31 becomes inactive. As a result, the operating voltage to CPU10 shifts from increasing to decreasing. Thereafter, similarly, the voltage generation circuit 30
As shown in FIG. 2, the operating voltage supplied from the CPU 10 to the CPU 10 repeats increases and decreases based on the second operating voltage VL. Thus, the second operating voltage vL is supplied to the CPU10. Therefore, at this time, the CPU 10 can reliably perform the storage retention operation of the internal memory.

Then, the reception period of the group to which the device belongs approaches, and a certain time tl before that, the hold release circuit 44 generates a hold release signal as shown in FIG. Then, the CPU 10 releases its own hold state. Further, at this time, the switch control circuit 42 sets the switch 41 to a continuously open state. Therefore, the clock is continuously supplied to the voltage converter 31, and the voltage converter 31
1 is in a continuous operating state, which causes the voltage generation circuit 30
As shown in FIG. 2, the operating voltage supplied to the CPU 10 from the CPU 10 returns to the first operating voltage V before the reception operation period begins, and as a result, the CPU 10 starts executing various control operations.

On the other hand, in the reception standby state, if the holder inputs a message display instruction by operating a switch on the operation input section 9, this input signal is sent to the hold release circuit 4.
4 as an interrupt signal. Then, in this case as well, the hold release circuit 44 outputs a hold release signal, and as a result, the hold state of CPU10 is released.

At the same time, the switch control circuit 42 causes the switch 41 to shift to a continuous open state, and thereby the voltage converter 31 also shifts to a continuous operating state, and from then on, the operating voltage to the CPU10 is set to the first operating voltage V)I. Return. Therefore, the CPU 10 can thereafter execute message display control according to the instruction contents from the operation input section 9.

In this embodiment, in the reception standby state,
The operating voltage supplied to the CPU10 is changed from the first operating voltage V11 during the receiving operation to the second operating voltage VL lower than the first operating voltage V11 during the receiving operation.
, the power consumption of the CPU10 can be reduced compared to the conventional system by an amount corresponding to the difference in the operating voltage mentioned above, thereby further enhancing the battery saving effect and extending the battery life. It becomes possible. Furthermore, in this embodiment, the operation of returning from the second operating voltage V to the first operating voltage VH is started before a certain period of time tl before returning from the receiving standby state to the receiving operating state. It is possible to reliably return the CPU 1.0 to the normal control operating state without delay before the reception period of the group to which the machine belongs.

Furthermore, even if an interrupt such as a message display instruction occurs in the reception standby state, the operating voltage to the CPU10 is returned to the first operating voltage Vl+, so the message display operation etc. can be performed without any trouble such as fir. be able to.

Furthermore, the voltage generation circuit 30 that is generally already provided as a power supply circuit in a selective calling receiver is used as is, and a relatively simple voltage supply control circuit 30 consisting of a timer, a voltage detector, etc. is added thereto. Since the power supply voltage of the CPU10 is controlled by the above-mentioned configuration, there is an advantage that it can be realized with a simpler configuration than the case where two completely independent power supply circuits are provided.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and for example, the configuration of the voltage generation section and the power supply control section, the type and configuration of the selective call receiver, etc. may be varied without departing from the gist of the present invention. It can be modified and implemented.

[Effects of the Invention] As described in detail above, the present invention includes a separately excited voltage conversion circuit and a clock generation circuit that supplies a switching clock to the voltage conversion circuit. In addition to a voltage generation section that generates a power supply voltage and supplies it to the control section, a voltage detection circuit that detects a power supply voltage value supplied from the voltage generation section to the control section and a clock supply to the voltage conversion circuit are provided. A power supply control section equipped with a switch circuit that turns on and off is provided, and the power supply control section allows the voltage detection circuit to monitor the power supply voltage value while the radio section is in reception standby mode, and the switch circuit to supply the voltage to the voltage conversion circuit. By intermittently supplying the clock to the control unit, a predetermined second power supply voltage lower than the first power supply voltage is generated from the voltage generation unit and supplied to the control unit. It is possible to reduce the power consumption even in the circuit section, thereby providing a selective call receiver that can further reduce the power consumption of the entire receiver and extend the battery life.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram showing the main part configuration of a selective call receiver in an embodiment of the present invention, Fig. 2 is a signal waveform diagram used to explain the operation of the receiver, and Fig. 3 is a selective call receiver. FIG. 2 is a circuit block diagram showing an example of the configuration. DESCRIPTION OF SYMBOLS 10... CPU, 20... Power supply, 30... Voltage generation circuit, 31... Voltage converter, 32... Clock generator, 33... Voltage limiter, 40... Voltage supply control Circuit, 41...Switch, 42...Switch control circuit, 43...Voltage detection circuit, 44...Hold release circuit, VH first operating voltage, ■L...Second operating voltage .

Claims (1)

[Claims] a radio unit that receives a selective call signal sent from the base station;
In a selective call receiver, which comprises a notification unit that issues a call notification when a call to its own device occurs, and a control unit that performs predetermined control, and controls power supply to the radio unit to cause the radio unit to operate intermittently. , comprising a separately excited voltage conversion circuit and a clock generation circuit that supplies a switching clock to the voltage conversion circuit, and generates a first power supply voltage during reception operation of the wireless section and supplies the voltage to the control section. a voltage detection circuit that detects a power supply voltage value supplied from the voltage generation section to the control section, and a switch circuit that turns on and off a clock supply to the voltage conversion circuit; While the voltage detection circuit monitors the power supply voltage value, the switch circuit intermittently supplies a clock to the voltage conversion circuit to generate a predetermined second power supply voltage lower than the first power supply voltage. 1. A selective call receiver comprising: a power supply control section for generating power from the control section and supplying the power to the control section.