JPS6133728Y2 - - Google Patents

Description

[Detailed description of the invention] This invention enables the control device to turn on and off only the power switch of the radio without modifying the radio when the radio does not have a power supply terminal for the control device. This invention relates to an interlocking power switch that can also turn on and off the power of the switch.

If the radio does not have a power terminal for the control device,
Power is supplied to the control device through a power switch separate from that of the radio, but in this case it is inconvenient because two power switches must be operated in order to operate the radio and the control device. The operation in this case will be explained with reference to FIG. 1. In the figure, 1 is a radio device to be remotely controlled, and 2 is a control device that remotely controls transmission and reception of the radio device. Radio 1
Only the parts necessary for explanation are shown.S1 _is a power switch, 11 is a power supply circuit,
2 is a transmission/reception switching circuit. The transmission/reception switching circuit 12 switches between transmission and reception using a pre-talk switch (not shown) on the wireless device side, and a control device 2 is added to remotely control this. Control device 2
includes a power supply circuit 21, a transmission/reception control circuit 22, and a transmission/reception switch circuit 23, and the control line 3 is connected between the output terminal of the transmission/reception switch circuit 23 and the input terminal of the transmission/reception switching circuit 12. Transmission/reception switching circuit 12 of radio device 1
Since the transmit/receive switch circuit 23 functions in the same manner as the pre-talk switch described above, the transmit/receive switch of the radio is remotely controlled by the control device 2.

By the way, if the radio 1 is not provided with a power supply terminal for the control device, that is, the power switch _S1 is interposed only between the power supply PS such as a battery and the power supply circuit 11, and the output of the switch _S1 is branched to the outside. In order to avoid the trouble of modifying the radio and installing an external power terminal when it is not installed, it is necessary to provide a separate power switch S ₂ between the normal power supply PS and the power supply circuit 21 of the control device 2. . However, doing so requires operating two switches S ₁ and S ₂ during remote control, which is inconvenient.

The present invention provides an interlocking power switch that allows power to be supplied to a control device by operating only the power switch of the radio, without making any modifications to a radio that does not have a power terminal for the control device. I have something to offer. That is, the present invention includes a power switch,
Transmission/reception control for controlling transmission/reception of the radio device, which has an input terminal of a transmission/reception switching circuit that attains a predetermined level during reception and a level that is an inversion of the predetermined level when the power switch is turned off and when transmitting. A control device having a transmission/reception switch circuit that receives the output of the transmission/reception control circuit and drives the transmission/reception switching circuit is attached, and a control line is connected between the output terminal of the transmission/reception switch circuit and the input terminal of the transmission/reception switching circuit. In an interlocking power switch of a remote control system connected to a logic circuit that resets the memory element when the memory element becomes OFF, and a switching element that is turned on by the set output of the memory element and turned off by the reset output, and the switching element controls the control device. The present invention is characterized in that the power supply is controlled, and this will be explained in detail below with reference to the illustrated embodiments.

FIG. 2 is a block diagram showing an overview of the present invention, and the same parts as in FIG. 1 are given the same reference numerals. The present invention focuses on the fact that when the power switch S ₁ of the radio 1 is turned on, the level of the input terminal of the transmission/reception switching circuit 12 becomes H (high) if it is receiving data (because it is a pre-talk switch). When the power is turned off and not in use, it is considered to be in the normal reception state). Since this level becomes L (low) by turning off the switch _S1 , it is possible to control the power supply of the control circuit 2 by detecting these levels H and L. However, since the input terminal is at the L level even when switching to the transmitting state, it is necessary to distinguish between this and when the switch _S1 is turned off. In order to make such a logical judgment, the interlocking power supply switch section 4 has two inputs, the output level a of the transmission/reception control circuit 22 and the level b of the control line 3, and interlocks the power supply d to the power supply circuit ₂₁ with the switch S1. It was designed to be controlled by

Next, an embodiment of the present invention will be described with reference to FIG. The transmission/reception switching circuit 12 of the radio 1 has a resistor R ₂ at its input stage, and when the press talk switch S ₃ is opened (receiving state) with the switch S ₁ turned on, the input terminal 13 becomes H level. , and when the switch _S3 is closed (transmission state), the terminal becomes L level. Transmission/reception switching is performed by these levels H and L, but detailed explanation thereof will be omitted here. For remote control, stop using this pre-talk switch S ₃ (leave it open) and connect the input terminal 13 and the output terminal (collector of transistor TR ₃ ) of the transmitting/receiving switch circuit 23 of the control device 2. Connect with control line 3. The control device 2 is equipped with a switch _S4 which is a substitute for the pre-talk switch _S3 of the radio device 1, and when the switch _S4 is closed (turned on), the output a of the transmission/reception control circuit 22 becomes L level. This is when transmitting, and when receiving, switch _S4 is left open (off) and signal a is set to H level. The transmitting/receiving switch circuit 23 inverts the signal a with the inverter INV ₂ , and uses the output of the inverter INV 2 to invert the signal a.
Control TR ₃ . Therefore, if switch _S4 is off, a=H, and since transistor _TR3 is off, b=
It becomes H (reception). Conversely, when switch _S4 is turned on, a=L, transistor _TR3 is turned on, and b=L.
(transmission) (see Figure 4).

Interlocking power switch section 4 includes power supply PS and control circuit 2
A PNP transistor (switching element) TR ₂ is interposed between the power supply circuit 21 of the radio device 1 and the power supply circuit 21 of the radio device 1.
This is linked to switch _S1 . Inverter INV ₁ , AND circuit AND, flip-flop FF
constitutes a power supply control circuit 41 having two inputs of signals b and c, and its output controls the transistor _TR1 . For details, refer to the flip-flop FF output Q.
The npn transistor _TR1 is operated and the transistor _TR2 is controlled through the resistor _R1 , but this configuration can be changed as appropriate.

Next, a series of operations when the switch _S1 of the radio device 1 is operated will be explained with reference to the time chart shown in FIG. First, when the switch S ₁ is turned on at time t ₀ , the level b of the input terminal 13 and therefore the control line 3 becomes H through the resistor R ₂ of the radio 1 (switch S ₃ ,
(because transistor TR ₃ is off). Since the power supply circuit 42 of the interlocking power switch section 4 is constantly supplied with power PS, when b=H, the flip-flop FF is set and the Q output becomes H. Q=H
When this happens, both transistors TR ₁ and TR ₂ are turned on, so the power supply d to the control device 2 is turned on. This time is _t1, and ( _t1 - _t0 ) is the delay in the operation of the interlocking power switch section 4. When the power is turned on to the control device 2, the switch _S4 is normally open, so a=H. Conversely, b=H is maintained, and the radio device 1 maintains the receiving state. _{From t2} to _t3 is the time of transmission with switch _S4 turned on. During transmission, the transistor TR ₃ is turned on and b=L, and the output of the inverter INV ₁ becomes H. If this is applied directly to the reset terminal R of the flip-flop FF, Q=L, and the power to the control device 2 is turned on. Cut off. In order to avoid this inconvenience, the output of the inverter INV ₁ is led to the AND circuit AND, and the opening and closing of the AND circuit is controlled by the output a of the transmission/reception control circuit 22. In this way, when sending b
=L, since a=L at this time, there is no risk that the flip-flop FF will be reset by the output c of the AND circuit. On the other hand, when switch _S1 is turned off at time _t4 , b=L. This is different from the time of transmission in that the condition a=H is obtained at the same time, and the flip-flop FF is reset by the output of the AND circuit AND. Ru. As a result, the power d to the control device 2 is cut off at time _t5 . (t ₅ −t ₄ ) is the delay time of the switch section 4.

This radio device 1 is used, for example, as an AUM (automotive vehicle position display device). In this case, the radio device 1 is mounted in a suitable location of a vehicle (automobile), for example, under a chair, in a trunk room, etc., and performs communication with a command station, notification of the location of the vehicle, etc. The control device 2 is placed near the driver, and a control line 3 and the like are arranged between the radio device 1 and the control device 2.

As described above, according to the present invention, the power of the control device can be controlled in conjunction with the power switch of the radio, but this is particularly difficult when adding a control device for remote control to an existing radio. This is useful because it can be applied to a wireless device that is not provided with a power supply terminal for a control device without any modification to the wireless device (including any additional wiring or the like). Incidentally, the interlocking power switch may be built into the control device, or may be an independent unit.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional radio remote control system, Fig. 2 is a block diagram showing an overview of the present invention, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is a block diagram showing an example of a conventional radio remote control system. This is the time chart. In the figure, 1 is a radio device, 2 is a control device, 3 is a control line, 4 is an interlocking power switch section, 12 is a transmission/reception switching circuit, 13 is its input terminal, 22 is a transmission/reception control circuit,
23 is a transmitting/receiving switch circuit, 41 is a power supply control circuit,
_S1 is a power switch, and _TR2 is a switching element.

Claims (1)

[Scope of Claim for Utility Model Registration] A radio device having a power switch and an input terminal of a transmitting/receiving switching circuit that reaches a predetermined level during reception, and a level that is the inverse of the predetermined level when the power switch is turned off and when transmitting. , a control device having a transmission/reception control circuit for controlling transmission/reception of the radio, and a transmission/reception switch circuit for receiving the output of the transmission/reception control circuit and driving the transmission/reception switching circuit; In an interlocking power switch of a remote control system connected to an input terminal of a transmission/reception switching circuit by a control line, a memory element set by the predetermined level of the control line and an output from the transmission/reception control circuit indicating reception. a logic circuit that generates a level and resets the storage element when the control line reaches the inverted level; and a switching element that is turned on by the set output of the storage element and turned off by the reset output. An interlocking power switch characterized in that the switching element controls power supply to the control device.