JPS60182229A - Battery saving system - Google Patents

Abstract

PURPOSE:To decrease the power consumption of a waiting time by providing a carrier detection circuit and a saving control circuit and setting an ON-time of a reception circuit applying intermission reception with the said control circuit to a time detecting a carrier to reduce the detection time of a connection control signal. CONSTITUTION:The carrier detection circuit 11 is provided to an output side of a reception circuit 6 of a radio equipment applied with the battery saving system and an IF output of the circuit 6 is introduced. The circuit 11 detects the level of the IF output and when the level is a prescribed value or over, the detection signal is fed to a control circuit 12. Further, power swtiches 5, 2, a battery 4, and the reception circuit 6 are connected to the control circuit 12 and the switch 5 is connected to the reception circuit 6 and a transmission circuit 3 is connected to the switch 2. Then the on-time of the reception circuit 6 applying intermittent reception is set to a time at which the circuit 11 detects the carrier to decrease the detecting time of the connection control signal thereby reducing the power consumption of the wait time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a battery saving method applied to a radio device such as a radio telephone device.

[Technical background of the invention]

Generally, this type of radio equipment often uses a battery as a power source, and reducing current consumption has become an important issue in order to extend the life of the battery. Therefore, in the past, the transmitting circuit is turned off during standby, and the receiving circuit is operated intermittently to perform so-called battery saving, in order to reduce the current consumption.

FIG. 1 is a schematic diagram of a radio device to which a conventional battery saving method is applied. In the figure, during standby, the control circuit 1 turns off the stain source switch 2, thereby cutting off the power supply from the battery 4 to the transmitter circuit 3. As a result, the transmitter circuit 3 is activated as shown in FIG. It is in the off state as shown in (,).

At the same time, from the control circuit 1 to the power switch 5,
A 6-ping control signal is supplied, thereby intermittent power supply to the receiving circuit 6, and the receiving circuit 6 repeats on/off operations at a constant cycle as shown in FIG. 2(b).

In this state, when the connection control signal (FIG. 2(C)) arrives, this signal is received during the ON period of the receiving circuit 6.The control circuit 1 then recognizes that this signal is calling itself. When the confirmation is confirmed, the control circuit 1 turns on the receiving circuit 6 continuously, and the transmitting circuit 3 turns on to send out a response signal (Fig. 2(d)), and from then on, the communication is stopped. becomes possible.

Therefore, in the case of such a radio, the receiving circuit 6 operates only during the period tON in the figure during standby, so the current consumed by the receiving circuit is equal to the current when operating continuously. As a result, the overall current consumption can be significantly reduced.

[Problems with background technology]

Incidentally, in recent years, in response to the demand for smaller and lighter radio equipment, it has been desired to further reduce the current consumption during standby. However, in the conventional method, the on period of the receiving circuit 6 cannot be shortened because it is defined by the detection period of the connection control signal. For this reason, attempts have been made to reduce current consumption by setting a longer off-period, but this tends to lengthen the time from when the other party makes a call until the connection control signal is detected. However, the time required for connection becomes longer, which is undesirable. Furthermore, the longer time required for connection is extremely undesirable, especially in the case of a system to which a multi-channel access method is applied. In other words, this type of system uses a common control channel to control connections, so while it is being used at one wireless station, it cannot be used at another station.
This had the drawback of causing a drop in the connection completion rate.

[Purpose of the invention]

The present invention provides a battery saving method that can significantly reduce the current consumption during standby without increasing the detection time of connection control signals, thereby reducing the size and weight of radio equipment, and shortening the connection time. The purpose is to

[Summary of the invention]

In order to achieve the above object, the present invention focuses on the fact that while the detection time of a connection control signal is generally several hundred msec, the carrier detection time is extremely short at about 10 msec, and the present invention uses a carrier detection circuit. The saving control circuit sets the on-time of the receiving circuit that performs intermittent reception operation to the time necessary for the carrier detection circuit to detect the carrier, and when the carrier detection circuit detects the carrier. The on-time of the receiving circuit is set to at least the time necessary to detect the connection control signal from the received radio waves.

[Embodiments of the invention]

FIG. 3 is a circuit diagram of a radio device to which a battery saving method is applied in an embodiment of the present invention. In this figure, the same parts as those in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.

A carrier detection circuit 11 is provided on the output side of the receiving circuit 6. This carrier detection circuit 11 introduces the intermediate frequency output (IF output) of the 5-receiver circuit 6, determines its level, and generates a detection signal (PaH'' level) when this level is equal to or higher than a predetermined value. This detection signal is supplied to the saving control circuit 12.The saving control circuit 12 has a microprocessor as a main control unit, and controls battery saving according to a predetermined control procedure. Let's do it.

Next, the battery saving method of this embodiment will be explained based on the above configuration. During standby, the control circuit 12 outputs an off control signal to the power switch 2, so that the transmitting circuit 3 is not supplied with power output from the battery 4, as shown in FIG. It is in an off state (inactive state). At the same time, the control circuit 12 also controls the power switch 5.
As a result, the receiving circuit 6 periodically receives the power output from the battery 4 only for a certain period of time to perform an intermittent receiving operation as shown in FIG. 4(b). By the way, the on time ton' of this intermittent reception operation is set to the time required for the carrier detection circuit 116 to detect a carrier. Note that the repetition period of the above intermittent reception operation (t6N+t6
rF) is set equal to that in FIG. 2 above.

In this state, when a connection control signal arrives as shown in FIG. 4(,), this signal is received during the period in which the receiving circuit 6 is turned on for the first time thereafter. Then, the carrier of the connection control signal is detected by the carrier detection circuit 11, and the carrier detection circuit 11 detects the carrier of the connection control signal.
As shown in FIG. 4(d), a detection signal is generated from this point.

When this detection signal is issued, the control circuit 12 continues to turn on the receiving circuit 6 for the time necessary to detect the connection control signal without outputting the OFF control signal to the power switch 5, and during this period, the control circuit 12 keeps the reception circuit 6 in the ON state for the time necessary to detect the connection control signal. Determine whether or not it is for self. If it is determined that the signal is not directed to the receiving circuit 6, as shown in FIG. The receiving circuit 6 is turned off. On the other hand, if it is determined that the connection control signal is for itself, the receiving circuit 6 is left in the on state as shown by the two-dot chain line ■ in FIG. 4, and the power output is supplied to the transmitting circuit 3. The transmitting circuit 3 is turned on.

In this way, in this embodiment, the on-period tON' of the reception circuit 60 during standby is changed from the conventional one (FIGS. 1 and 2).
It can be made significantly shorter than the previous one, which can reduce high current consumption. Further, in this case, since the period of the on period is no different from that of the conventional method, there is no problem that the connection time becomes longer. As a result, even in a system to which a multi-channel access method is applied, the exclusive time of the control channel does not become long, so that the connection completion rate does not decrease. Furthermore, radio equipment to which a multi-channel access method is applied generally uses a synthesizer to set communication channels and control channels, but this synthesizer has the disadvantage of large current consumption. However, according to this embodiment, since the on-time of the receiving circuit 6 can be extremely shortened, the operating time of the synthesizer can be shortened, and as a result, the current consumption of the radio device can be significantly reduced. .

Note that the present invention is not limited to the above embodiments. For example, in addition to the carrier detection circuit that determines the IF output level of the receiving circuit 6, a circuit that can detect carriers isometrically, such as a noise squelch or an empty channel detection circuit, may be used. Furthermore, the cycle of the on operation may be shortened by the amount of time that the receiving circuit 6 is on.

In this way, connection time can be shortened without increasing current consumption. Further, the period of the above-mentioned ON operation can be set as appropriate in consideration of the current consumption. In addition, the configurations of the control circuit 12, the carrier detection circuit 11, etc. can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention] As described in detail above, the present invention includes a carrier detection circuit and a saving control circuit, and uses the saving control circuit to adjust the on-time of the receiving circuit that performs intermittent receiving operation to the carrier. The time required for the detection circuit to detect the carrier is set, and the on-time of the receiving circuit when the carrier is detected by the carrier detection circuit is set to at least the time required for detecting the connection control signal from the received radio waves. be.

Therefore, according to the present invention, the current consumption during standby can be reduced without prolonging the detection time of the connection control signal, making it possible to reduce the size and weight of wireless devices, and shortening the connection time. A battery saving method can be provided.

[Brief explanation of drawings]

Figures 1 and 2 (,) to (d) are for explaining the conventional battery saving method. Figure 1 is a circuit block diagram of a radio device to which the same method is applied, and Figure 2 (,) ~(
d) is a timing diagram used to explain its operation, and FIGS. 3 and 4 (, ) to (d) are for explaining the battery saving method in one embodiment of the present invention, and FIG. A circuit block diagram of a 10-radio device to which the above is applied, and FIGS. 4(a) to 4(d) are timing diagrams used to explain its operation. 1...Saving control circuit (control circuit), 2゜5...
・Power switch, 3... Transmission circuit, 4... Battery, 6... Receiving circuit, 11... Carrier detection circuit, 1
2...Control circuit (saving control circuit). Applicant's representative Patent attorney Takehiko SuzueContinued from page 10 Inventor: Mr. Ito - Inside the Asahi Rikitsuno Factory, Hino City0 Inventor: Shoji Fuse 163, inside the Asahi Rikitsuno Factory, Hino City -

Claims (1)

[Claims] A radio device that turns off a transmitting circuit and operates a receiving circuit intermittently during standby, includes a carrier detection circuit for detecting a carrier of received radio waves, and a saving control circuit, the saving control circuit controlling The on-time of the circuit is set to the time necessary for the carrier detection circuit to detect a carrier, and when the carrier detection circuit detects a carrier, the on-time of the receiving circuit is set at least a little while at a time when a connection control signal is transmitted from the received radio wave. A battery saving method characterized by setting the time required for detection.