JPH0313826Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a portable radio device equipped with a warning display circuit to notify an operator of a drop in battery voltage.

In general, there are many battery-powered devices, and battery-powered devices are especially essential for portable devices such as portable radios. In this case, monitoring the battery voltage is the most important thing; if it falls below a predetermined value, it will not only be impossible to maintain normal operation, but also, for example, in the case of a battery using a so-called nickel-cadmium battery, it will fall below the final voltage. Allowing the battery to discharge to a certain point should be avoided as this will accelerate the deterioration of the battery's performance. In any case, when the battery voltage falls below a predetermined value, the operator must be warned of this and appropriate measures must be taken.

Various warning display circuits of this type have been proposed in the past. However, most of them use warning display lamps, and the method of displaying the lamps is either to simply turn them on in the event of a warning, or to turn them off. The warnings were often overlooked because they were weak in their appeal to operators.

SUMMARY OF THE INVENTION An object of the present invention is to provide a portable wireless device equipped with a warning display circuit that is highly appealing to operators, can be easily realized in a small size, and can reduce battery consumption.

In accordance with the above object, the present invention connects a warning light generator and a warning sound generator in series to generate a warning sound in addition to the warning light. The present invention is characterized in that a warning display circuit consisting of a generator is provided in the transmitting circuit system, and the warning display circuit is activated only during transmission, thereby reducing battery consumption.

That is, if a warning display is performed using a warning light and a warning sound, the level of appeal to the operator will be very high, but the battery consumption for the warning display will also be large. For this reason, battery consumption must be minimized, and portable radios are configured so that the receiving circuit and transmitting circuit are selectively connected to the battery via a switch (pre-talk switch). The receiving circuit is normally connected to the battery.

Therefore, if the warning display circuit is provided in the transmission circuit system, the battery will be consumed only during transmission, and the amount of battery consumption can be reduced.

The present invention will be explained below with reference to the drawings.

It is rare to see a general warning display circuit that generates a warning light and a warning sound at the same time. However, this refers to general equipment for consumer use, and it is thought that such types of equipment exist for special equipment such as nuclear power generation equipment.
The reason why it is rare to see a warning light and warning sound emitting at the same time in general consumer equipment is that there is no need to go to such lengths to increase the size and cost of the equipment. . However, the warning light-
It is clear that the simultaneous occurrence of warning sounds has an extremely high warning appeal to operators, and if
This kind of simultaneous generation of warning light and warning sound should be widely utilized without increasing the size and cost of the equipment. In this case, it is more effective to flash the warning light.
Further, it is more effective if the warning sound is an intermittent sound (pitsu, ping, ping, etc.).

FIG. 1 is a block diagram showing a generally considered warning display circuit of flashing warning light and intermittent warning sound.
In the figure, 11 is a battery voltage drop detection circuit that detects a voltage drop in a battery (not shown). After this detection circuit 11, intermittent warning sound generation systems 12 and 13 and flashing warning light P generation systems 14 and 15 are provided.
and are established independently. When the detection circuit 11 detects a voltage drop, the intermittent sound generation drive circuit 12 operates, drives the sounding body 13, and provides an intermittent warning sound S to the operator. At the same time, the flashing light generation drive circuit 14 operates to drive the lamp 15 and provide the flashing warning light P to the operator. The operator instantly senses at least one of the sound S or the light P and becomes aware of the warning.

By the way, in the circuit shown in FIG. 1, there are two independent systems for the intermittent warning sound S and the flashing warning light P, so
The circuit scale becomes large and the cost also increases. Therefore, the present invention focuses on the fact that the intermittent period of the intermittent warning sound S and the flashing period of the flashing warning light P can be made completely the same, and realizes a small and simple warning display circuit. The block diagram in FIG. 2 shows the principle of this implementation example. In this figure, the first
Components indicated with reference numbers or symbols used in the figures are mutually identical. Block 22 is therefore a new component. Block 22 is therefore a new component. However, since this is almost the same as the intermittent sound generation drive circuit 12 of FIG. 1, the blinking light generation drive circuit 14 of FIG. 1 is not necessary after all. Normally, the circuit 14 is composed of a blinking oscillation circuit and a lamp drive circuit connected in series with the flashing oscillation circuit, so there are great benefits associated with eliminating the need for this circuit 14. When configured as shown in Figure 2, the signal waveform appearing in the main part is the third waveform.
As shown in the figure. First, upon receiving the detection output from the detection circuit 11, the intermittent sound generation drive circuit 22
Outputs a signal with a waveform as shown in Figure a. This signal is made up of, for example, a signal train of about 3KHz arranged at about 0.2 seconds. Since this signal is directly applied to the sounding element 13, it is outputted from the buzzer 13 as a 3kHz sound S intermittently at intervals of 0.2 seconds. This signal is also applied to a lamp 15, for example an LED. Therefore, the lamp 15 repeats turning on and off at 3kHz at intervals of 0.2 seconds. however,
Since turning on and off at 3kHz is not perceptible to humans, it is only perceived as a flashing light P with a period of 0.2 seconds as shown in Figure 3b. The characteristic features of the present application are well expressed by FIGS. 3a and 3b shown here.

Finally, a specific example of the block configuration shown in FIG. 2 is shown in FIG. The circuit shown in this figure is applied to a press-to-talk type portable radio. In this figure, circuits belonging to ranges 11, 22, 13 and 15 are blocks 11, 22, 13 in FIG.
and 15, respectively. B is a battery that is subject to a warning display. Battery B is turned on by the main switch MS when the radio is in use. This radio is a press talk type, so the main switch MS
The battery voltage that has passed through is selectively distributed to the receiving circuit system or the transmitting circuit system by a manually operated changeover switch SS. The warning display circuits 11, 22, 13, and 15 of the present application are inserted into the transmission circuit system. The reason is Switch SS and
This is because if the circuits 11, 22, 13, and 15 are inserted between the MSs, battery energy is constantly consumed by these circuits, which is disadvantageous for energy saving. Therefore, if it is inserted into the transmitting circuit system, the circuits 11, 22, 1 will be activated only during transmission (on air).
3 and 15, battery energy is consumed.
The second reason is that radios usually have an on-air indicator lamp that lights up when transmitting, so this existing lamp can also be used as the warning lamp 15, making it compact and compact. This is because it is advantageous in reducing costs and reducing costs.

The battery voltage from battery B via switches MS and SS is divided by resistors 41 and 42 and applied to the first input of voltage comparator 45. or,
A predetermined reference voltage value is applied to its second input by a Zener diode 44 connected in series with a resistor 43. When the battery voltage is above a predetermined value (normal), the output of the comparator 45 is in a short state, whereas when it is below a predetermined value (at a warning), it is in an open state.

Next, looking at the intermittent sound generation drive circuit 22 at the next stage, the circuit 22 includes transistors 52 and 5.
3. Feedback resistor 50 and capacitor 51, and resistor 47 for blocking operation.
49, a blocking oscillator consisting of a capacitor 48. This feedback is positive feedback, and when the transistor 52 is turned on, it oscillates. The values of the resistor 50 and capacitor 51 are set so that this oscillation occurs at the frequency of 3 kHz of the signal train shown in FIG. 3a.

By the way, the transistor 52 turns on because the resistor 4 is connected to the base of the transistor 52.
This is when the bias current is supplied through 6, 47, and 49, and this is when the output of the comparator 45 becomes open (at the time of warning). In this open state, the blocking oscillators 50 to 53 oscillate, and the sounding body 55 makes a "beep" sound.
It emits a sound of approximately 3kHz. The base circuit of the transistor 52 includes a charging/discharging circuit consisting of a resistor 47 with high resistance (for example, several 100KΩ) and a capacitor 48 with large capacity (for example, 10 and several μF). The bias current is not supplied continuously, but is supplied intermittently at intervals determined by the charging/discharging cycle. Here, the sounding body 55 does not produce a continuous sound of approximately 3 kHz such as "beep", but produces an intermittent sound (pitch, pit, pit,...) as shown in FIG. 3a. Note that 54 in the figure is a diode added to the coil of the sounding body 55 for preventing back electromotive force.

Next, looking at the next stage lamp 15, this is
It is composed of an LED 57 and a resistor 56. resistance 56
is Lamp 1 as an on-air indicator when transmitting.
5 (LED57).
On the other hand, when the battery voltage drops, the sounding element drive current flows intermittently to the circuit 22 side, so the LED 57
This intermittent approximately
By superimposing the sounding element drive current with a period of 0.2 seconds, the brightness changes intermittently (flashing). As explained above, according to the present invention,
A portable radio device is realized that is equipped with a warning display circuit that can simultaneously generate a warning sound and a warning light without increasing the size of the circuit, and can reduce battery consumption.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a generally considered warning display circuit of flashing warning light and intermittent warning sound, Fig. 2 is a block diagram showing the principle configuration of the warning display circuit used in the present invention, and Fig. 3 is a block diagram showing the basic structure of the warning display circuit used in the present invention. FIG. 4 is a circuit diagram showing a warning display circuit applied to a portable radio. In the figure, 11 is a battery voltage drop detection circuit;
3 is a sounding body, 15 is a lamp, 22 is an intermittent sound generation drive circuit, and B is a battery.

Claims (1)

[Claims for Utility Model Registration] It has a receiving circuit system and a transmitting circuit system that are selectively connected to a battery according to switching of a switch, and a warning is issued when it is detected that the battery voltage has decreased below a predetermined value. In order to simultaneously display sound and warning light, the warning sound generator and the warning light generator are connected in series, and the driving current of the warning sound generator is simultaneously supplied to the warning light generator. The portable wireless device is equipped with a warning display circuit, wherein the warning display circuit is provided in the transmitting circuit system, and the warning light generator is an on-air radio device that lights up during transmission. A portable radio device characterized by being shared with an indicator lamp.