JPH10145258A - Switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching device which has superior operability and in which a push to talk switch exercises a function as a power switch. SOLUTION: This device has an unipolar push to talk switch 1, a changeover switch 5, which is connected between a direct current power source and a radio equipment PTT(push-to-talk) control circuit 3 and switches a lock-release mode from/to a push to talk mode, a 1st switching circuit 7 which is connected between the direct current power source and the circuit 3, alternately switches on and off according to the on of the switch 1 at the time of the lock-release mode and supplies and disconnects the power from the direct current power source to the circuit 3 and the switch device itself and a 2nd switching circuit 8, which is connected between the direct current power source and the circuit 3 and supplies the power from the direct current power source to the circuit 3 and the switch device itself only at the time of the operation of the switch 1, when the push-to-talk mode is set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-to-talk (PTT) used for a mobile radio device or the like.
(Talk) operation.

[0002]

2. Description of the Related Art In a conventional remote PTT switch device for an electronic device such as a mobile radio, there is a trouble that the switch device must be kept depressed when transmission is continued. I had to be restricted. Also, if you press once, the transmission enabled state is maintained,
Further, there is a switch device that performs a so-called lock release operation (switching between transmission and reception each time the switch is pressed) in a configuration that switches to a receivable state when pressed, but in this case, other operations are restricted during transmission. Although it does not occur, it is often not clear whether the mobile wireless device or the like is transmitting or waiting for reception. A switch device that performs the same function as described above using an electronic circuit is also conceivable, but in that case, a power switch and a remote PTT switch must be provided separately, and the configuration of the electronic device becomes complicated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has excellent operability, a PTT switch also functions as a power switch, and a mobile radio or the like is transmitting. It is an object of the present invention to provide a switch device that can easily determine the state.

[0004]

According to the first aspect of the present invention,
What is claimed is: 1. A switch device for use in an electronic device that performs transmission and reception switching of a signal using power supplied from a DC power supply, comprising: a single-pole push-to-talk switch; the DC power supply; A switch for switching the switch device between a lock release mode and a push-to-talk mode, the switch device being connected between the transmission control circuit and the transmission control circuit for controlling the transmission of the DC power supply and the transmission control circuit. When the lock release mode is set by the changeover switch, on and off are alternately repeated in response to the on of the push-to-talk switch,
A first switch circuit that supplies or cuts off the power from the DC power supply to the transmission control circuit and the switch device itself, and is connected between the DC power supply and the transmission control circuit; When the talk mode is set, the push-to-
And a second switch circuit for supplying power from the DC power supply to the transmission control circuit and the switch device itself only when a switch is operated.

According to a second aspect of the present invention, there is provided a switch device used in an electronic device for transmitting and receiving a signal using electric power supplied from a DC power supply, wherein the switch device is a single-pole push-to-talk switch. A switch for switching the switch device connected between the DC power supply and a transmission control circuit for controlling transmission of the electronic device between a lock release mode and a push-to-talk mode. The switch is connected between the DC power supply and a control circuit, and when the lock release mode is set by the changeover switch, the switch is turned on in response to the turning on of the push-to-talk switch;
A first switch circuit that alternately turns off and supplies or shuts off the power from the DC power supply to the transmission control circuit and the switch device itself, and is connected between the DC power supply and the transmission control circuit; When a push-to-talk mode is set by a switch, power from the DC power supply is supplied to the transmission control circuit and the switch device itself only when the push-to-talk switch is operated. An alarm sound generating circuit for outputting an alarm sound during the transmission operation in the lock release mode and the push-to-talk mode; After a certain time,
A timer circuit for turning off the first circuit to cut off the supply of the electric power from the DC power supply to the transmission control circuit and the switch device itself.

According to the switch device of the first aspect of the present invention, when the lock release mode is set by the changeover switch, the first switch circuit operates as a push-to-talk switch. ON and OFF are alternately repeated in response to ON to supply or cut off the power from the DC power supply to the transmission control circuit and the switch device itself. Thus, the operation of supplying power from the DC power supply to the transmission control circuit and the switching device itself and the operation of cutting off the supply of power (that is, the transmission state or the like) by simply operating the push-to-talk switch. , Switching to the receiving state) can be performed, and the operability is extremely good.

[0007] Further, the push switch is operated by the changeover switch.
When the push-to-talk switch is operated while the to-talk mode is set, the second
The switch circuit supplies power from the DC power supply to the transmission control circuit and the switch device itself only during this operation. Thereby, only when the push-to-talk switch is operated, the operation of supplying the power from the DC power supply to the transmission control circuit and the switching device itself to make the transmission state is performed, and the push-to-talk switch is operated. When the above operation is not performed, the operation of stopping the supply of power can be executed, and the function of the power switch can be shared, so that the operability is improved as a whole.

According to the switch device of the second aspect of the present invention, in addition to the above-described operation, the alarm sound generation circuit can generate an alarm during the transmission operation in the push-to-talk mode or the transmission / reception switching mode. Since the sound is transmitted, the transmission operation can be confirmed by hearing. Further, the timer circuit turns off the first circuit after a lapse of a predetermined time from the ON state of the first switch circuit to cut off the supply of the power from the DC power supply to the transmission control circuit and the switch device itself. Therefore, it is possible to avoid a situation in which the transmission is not performed due to a user's accident or the like.

[0009]

Embodiments of the present invention will be described below in detail. FIG. 1 is an example of a circuit diagram illustrating a switch device according to an embodiment of the present invention. This switch device
The present invention is applied to a mobile radio, etc., and includes a single-pole push-to-talk switch 1 and an input terminal 2 which is a DC power supply, for example, supplied with 1.5 V from a dry cell. And a radio PTT control circuit 3 which is a transmission control circuit for performing transmission control of the mobile radio, and a first switch circuit 7 which will be described later are turned off to supply the power to the radio PTT control circuit 3 and the switch itself. Cut-off timer circuit (TOT timer circuit, TOT is Time OUT T
and an alarm sound for transmitting an alarm sound (for example, a 300 Hz intermittent sound which does not cause a transmission failure) during the transmission operation in the lock release mode or the push-to-talk mode. Circuit 6 and a push-to-talk mode (PTT mode: only when the electronic device connected between the input terminal 2 and the radio PTT control circuit 3 and the transmission alarm sound generation circuit 6 is pressed). It becomes a transmission state.)
And a lock release mode (when pressed once, the transmission state; when pressed again, the transmission state is stopped and the reception state is established). And a changeover switch 5.

A switching piece of the switch section 5a is connected to the input terminal 2 side, and a switching piece of the switch section 5b is connected to the radio PTT control circuit 3 side. The switch device further includes a first switch circuit 7 connected between a-side terminals (for setting a lock release mode) of the switch units 5a and 5b, and a b-side terminal of the switch units 5a and 5b. (For setting a push-to-talk mode).

When the lock release mode is set by the changeover switch 5, the first switch circuit 7 turns on the push-to-talk switch 1;
ON and OFF are alternately repeated in response to OFF, and supply or cutoff of the power from the DC power supply to the radio PTT control circuit 3 and the switch device itself is performed.

When the push-to-talk mode is set by the changeover switch 5, the second switch circuit 8 operates (turns on) the push-to-talk switch 1. Only when is the power from the DC power supply supplied to the radio PTT control circuit 3 and the switch device itself.

Here, the first switch circuit 7, the second switch circuit 8, and the timer circuit 4 will be described in detail.
The second switch circuit 8 has an emitter and a collector connected to both b-side terminals of the switch sections 5a and 5b, respectively, and a resistor R
A first drive transistor Q1 having a base connected to the push-to-talk switch 1 via a second resistor 2, a resistor R1 connected between the emitter and the base of the first drive transistor Q1, and It also has a capacitor C3 connected between the base and ground (GND).

The first switch circuit 7 includes a second drive transistor Q2 having an emitter and a collector connected to both a-side terminals of the switch sections 5a and 5b, respectively, and a base for the second drive transistor Q2. On the other hand, the collector is connected via a resistor R5, the emitter is connected to the third transistor Q3 connected to the emitter, and the emitter is connected to the a-side terminal of the switch section 5b, and the base is connected via the resistor R8 to the second transistor Q3. A fourth transistor Q4 connected to the collector of the driving transistor Q2 and further having an electrolytic capacitor C6 connected between the base and ground; a resistor R9 connected between the collector and the emitter of the fourth transistor Q4; The drain of the third transistor Q3 is connected to the base of the third transistor Q3 via the resistor R6, the source is grounded, and the gate is connected to the collector of the fourth transistor Q4. It has and a FETQ5 of P channel connected composite type.

The first switch circuit 7 further includes a resistor R3 and a diode between the emitter of the second drive transistor Q2 and the push-to-talk switch 1.
And a connection point of the resistor R3 and the diode D1 and the second driving transistor Q2.
An electrolytic capacitor C4 is connected between the
A resistor R4 is connected between the emitter and the base of the second drive transistor Q2.

The first switch circuit 7 is connected to the second switch circuit 7.
A capacitor C5 connected between the collector of the driving transistor Q2 and the ground, and a resistor R7 connected between the collector of the second driving transistor Q2 and the drain of the FET Q5.
And a series circuit of a resistor R10, a diode D2, and a capacitor C11 connected between the a-side terminal of the switch section 5b and the ground; the gate of the FET Q5 and the resistor R10;
And an electrolytic capacitor C7 connected between the node D2 and the connection point of the node D2.

Incidentally, between the input terminal 2 and the ground,
As shown in FIG. 1, capacitors C1 and C2 are connected,
The push-to-talk switch 1 and the resistor R2
Is connected to a capacitor C8.

The timer circuit 4 includes three resistors R12, R12,
A MOS type N-channel FET Q6 in which the gate is connected via R13 and R14 and the source is grounded,
A seventh transistor Q7 whose base is connected to the drain of Q6 and whose emitter is grounded;
An eighth transistor Q8 having a base connected to the collector of the seventh transistor, an emitter grounded, and a collector connected to the collector of the fourth transistor Q4.

A resistor R15 is connected between the collector of the first driving transistor Q1 and the drain of the FET Q6.
A resistor R16 is provided between the collector of the seventh transistor Q7 and the collector of the seventh transistor Q7.
Is connected. Further, the three resistors R12, R13,
A series circuit of a resistor R11 and a diode D14 is connected in parallel to the series circuit of R14.

Next, the operation of the switch device having the above-described configuration will be described with reference to waveform diagrams of the respective portions of the switch device shown in FIGS. First, in an initial state, the switch portions 5a and 5b of the changeover switch 5 are each locked release mode.
And the second drive transistor Q2 is turned off, that is, the wireless device PTT
In a state where power is not supplied to the control circuit 3).

At this time, as shown in FIG. 2, when the push-to-talk switch 1 is turned on, the charge stored in the electrolytic capacitor C4 is discharged, and the second drive transistor Q2 Base potential decreases. Therefore, the emitter of the second driving transistor Q2
The collectors begin to become conductive bears. Then, since the potential appears (becomes high) at the collector of the second driving transistor Q2, the base potential of the third transistor Q3 rises, and the conduction between the collector and the emitter of the third transistor Q3 becomes inactive. Then, the second drive transistor Q2 is completely fixed to the ON state.

In the initial state, the electrolytic capacitor C6 is in a completely discharged state, and only for a time determined by a resistance value r8 of the resistor R8 and a time constant (r8 × c6) determined by the electrolytic capacitor C6 and the capacitance value c6 of the electrolytic capacitor C6. The fourth transistor Q4 is turned on to short-circuit the resistor R9, thereby preventing the gate potential of the FET Q5 from decreasing when the push-to-talk switch 1 is on (keeping it high). , The off state of the FET Q5 is maintained.

On the other hand, the switch unit 5 of the changeover switch 5
a and 5b are respectively supplied to the a-side terminal for setting the lock release mode, and the second drive transistor Q2 is in the ON state, that is, power is supplied to the radio PTT control circuit 3. FIG.
The push-to-talk switch 1 shown in FIG.
Is turned on, the electric charge previously stored in the electrolytic capacitor C7 is discharged through the diode D2, and the gate potential of the FET Q5 is reduced to turn on the FET Q5.

When the FET Q5 turns on, the third transistor Q3 turns off and the second driving transistor Q2
The base potential of the second driving transistor Q increases.
2 is turned off, and the supply of power to the wireless device PTT control circuit 3 and the switch device itself is cut off.

Next, the switch unit 5 of the changeover switch 5
a and 5b are each in push-to-talk mode (PTT
(Mode), the case where the signal is input to the b-side terminal will be described. In this case, when the push-to-talk switch 1 is turned on, the base of the first drive transistor Q1 is turned on.
When the push-to-talk switch 1 is turned off, the base current of the first drive transistor Q1 stops flowing. Therefore, in response to the on / off of the push-to-talk switch 1, power is supplied or cut off to the radio PTT control circuit 3 and the switch device itself, and the push-to-talk switch 1 is turned off. The transmission state can be set only while pressing 1.

In the timer circuit 4, when the second drive transistor Q2 is turned on, charging of the electrolytic capacitor C9 via the resistors R12 to R14 is started.
When the potential of the electrolytic capacitor C9 exceeds the gate threshold voltage of the FET Q6, the FET Q6 turns on, the seventh transistor Q7 turns off, and the eighth transistor Q8 turns on, thereby turning on the FET Q5 and turning off the transistor Q3. , The second drive transistor Q2 is turned off, thereby preventing the user from transmitting and releasing the signal due to a user accident or the like.

In the case described above, the wireless device PTT
When power is supplied to the control circuit 3, the transmission alarm generation circuit 6 generates an intermittent sound of 300 Hz or less so as not to hinder transmission of a telephone or the like, so that transmission can be confirmed by audibility.

As is clear from the above description, according to the present embodiment, the operation of both the lock release switch and the non-lock switch is realized using the single-pole push-to-talk switch 1. it can. The lock release operation can be realized by an RS flip-flop circuit or the like. However, when a flip-flop circuit is used, stable operation at a low voltage cannot be expected, and a power switch circuit must be separately provided. However, there is a possibility that the circuit configuration becomes complicated and the power supply is forgotten to be turned off.

On the other hand, according to the present embodiment, 1.
It is assumed that it operates on a 5V battery,
According to the present embodiment, an operation is performed so as to serve as both a PTT switch and a power switch in order to prevent the integrated battery from being consumed. As described above, it is possible to realize a switch device with good operability, which can be switched according to the application, continuous confirmation by the audibility of the transmission mode, transmission and prevention of forgetting to turn off the power.

[0030]

According to the first aspect of the present invention, it is possible to provide a switch device which has good operability and also functions as a power switch. According to the second aspect of the present invention, in addition to the above-described effects, it is possible to provide a switch device that makes it easy to confirm a transmission operation by hearing and avoids a situation in which transmission is not performed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a switch device according to an embodiment of the present invention.

FIG. 2 is a waveform diagram of each part of a circuit element according to the embodiment of the present invention.

FIG. 3 is a waveform diagram of each part of a circuit element according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Push-to-talk switch 2 Input terminal 3 Radio PTT control circuit 4 Timer circuit 5 Changeover switch 6 Transmission alarm sound generation circuit 7 First switch circuit 8 Second switch circuit Q1 First drive transistor Q2 Second drive transistor

Claims (2)

[Claims] 1. A switch device used in an electronic device that performs transmission and reception switching of a signal using electric power supplied from a DC power supply, comprising: a single-pole push-to-talk switch; A switch for connecting the switch device between a lock release mode and a push-to-talk mode, the switch device being connected between a transmission control circuit for controlling transmission of the electronic device; And when the lock release mode is set by the changeover switch, on and off are alternately repeated in response to the on of the push-to-talk switch, A first switch circuit that supplies or shuts off power from the DC power supply to the transmission control circuit and the switch device itself, and is connected between the DC power supply and a transmission control circuit. When the push-to-talk mode is set by the changeover switch, the power from the DC power supply is supplied to the transmission control circuit and the switch device itself only when the push-to-talk switch is turned on. And a second switch circuit for supplying. 2. A switch device for use in an electronic device that performs transmission / reception switching of a signal using power supplied from a DC power supply, comprising: a single-pole push-to-talk switch; A switch for connecting the switch device between a lock release mode and a push-to-talk mode, the switch device being connected between a transmission control circuit for controlling transmission of the electronic device; When the lock release mode is set by the changeover switch, ON and OFF are alternately repeated in response to ON of the push-to-talk switch. A first switch circuit that supplies or cuts off power from the DC power supply to the transmission control circuit and the switch device itself, and is connected between the DC power supply and a transmission control circuit. When the push-to-talk mode is set by the changeover switch, the power from the DC power supply is supplied to the transmission control circuit and the switch circuit itself only when the push-to-talk switch is turned on. A lock switch mode, a push-to-talk mode,
An alarm sound generating circuit for transmitting an alarm sound during a transmission operation in a mode; and after a lapse of a predetermined time from an ON state of the first switch circuit, the first circuit is turned off to supply power from the DC power supply. And a timer circuit for interrupting supply to the transmission control circuit and the switch device itself.