JP2786034B2 - Signal circuit between devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-device signal circuit, and more particularly to an inter-device signal circuit for connecting devices having different power supplies.

[0002]

2. Description of the Related Art FIG.
As shown in the figure, the signal transmission circuits 50-1 to 50-n, the signal reception circuits 60-1 to 60-n, and the power-on reset circuit 30. Signal receiving circuits 60-1 to 60
-N is a relay contact rl _2-1
When ~rl _2-n is closed has become as to power-on, has become as to the power off when the contact rl _2-1 ~rl _2-n relays are open. Vcc ₁ and Vcc ₂ are separate power supplies, but have the same voltage value.

Next, the operation will be described with reference to FIG.

[0004] (1) 2-way switch SW _3-1 ~SW _3-n wherein R side when V _cc2 → commissioning V _cc1 in the order of V _cc1 rise POR (remote mode)
^* POW ON1 to PO in the state of “L” → “H”
The W ONn signal changes from “L” → “H” → “L” to “H” once.
Then, the ICs Z _{6-1 to} Z _6-n and Z _{3-1 to} Z _3-n are turned on once, and the dual coils SW _{3-1 to} SW _{3 are} connected to the relay coils RL _{2-1 to} RL _2-n. once current flows through _-n, the relay node rl _2-1 ~rl _2-n are closed. Relay contact r
When l _{2-1 to} rl _2-n are closed, each device is powered on.

Next, POW OFF ^* 1 to POW OF
F ^* n signal, if a state in which the state does not put out clogging power-off signal of the signal of the EPO ^* 1~EPO ^* n is "H" I
Since CZ _{2-1 to} Z _2-n are on, the relay coil R
L _{2-1 to} RL _2-n → b side of dual switches SW _{3-1 to} SW _3-n → Current continues to flow through ICs Z _{2-1 to} Z _2-n . Therefore, each device keeps the power-on state. If V _cc1 disappears in this state, IC Z _{2-1 to} Z
_{Since 2-n} turns off, the relay coils RL _{2-1 to} RL _2-n
There is no loop in which current flows through the relay contact rl _2-1
Since ~ rl2 _-n opens, each device is powered off.

[0006] (2) 2-way switch SW _3-1 ~SW _3-n is the L-side start-up in the order of V _cc2 → V _cc1 when the (local mode), V _cc1 is rising POR ^*
SW _1-1 ~SW in a state in which the signal is turned to "L" → "H"
Once _1-n is closed, if the EPO ^* -EPO ^* n signals are in the state of "H", that is, if the EPO ^* signal (signal for turning off the power of the device regardless of remote / local) is not output, IC Z _{4-1 to} Z _4-n , Z
_{1-1 to} Z _1-n are on, so the relay coil RL _2-1
~ RL _2-n to a side of double switch SW _3-1 ~ SW _3-n →
Once current flows through the switch _{SW 1-1 ~SW 1-n → IC} Z 1-1 ~Z 1-n, the relay contacts rl _2-1 ~rl
_2-n closes. The contacts rl _{2-1 to} rl _{2-n of the} relay close. When the contacts rl _{2-1 to} rl _{2-n of the} relay are closed, each device is powered on.

[0007] Next, EPO ^* 1~EPO ^* n signal is "H"
, The ICs Z _{4-1 to} Z _4-n , Z _{1-1 to} Z _1-n
Are on, relay coils RL _{2-1 to} RL _2-n →
Relay contacts rl _{2-1 to} rl _2-n → double switch SW
B side of _{3-1 to} SW _3-n → switch SW _{2-1 to} SW _2-n →
IC Z _1-1 current continues to flow through to Z _1-n. Therefore, each device keeps the power-on state.

In this state, if V _cc1 disappears, IC Z
_{1-1 to} Z _1-n turn off, so relay coil RL _2-1 to
RL _2-n there is no loop current flowing through each device unit for opening the contact rl _2-1 ~rl _2-n of the relay would be powered off. In the _{absence of Vcc1} , switch SW
_{Even if the 1-1 to} SW _1-n is closed once, since the Z _{1-1 to} Z _1-n are off, there is no loop in which current flows through the coils RL _{2-1 to} RL _2-n of the relay, and The contacts rl _{2-1 to} rl _2-n are not closed. Therefore, each device cannot be powered on.

[0009]

In the above-mentioned conventional inter-device signal circuit, when each device is in a power-on state,
If the control power supply of the signal transmission circuit is turned off by mistake, there is a disadvantage that all the device devices are turned off.

Further, there is a disadvantage that the power cannot be turned on / off even when each device is set to the local mode unless the control power supply of the signal transmission circuit is turned on, such as during maintenance of each device.

[0011]

A signal holding circuit according to the present invention has a first input terminal for inputting a power-on reset signal for canceling a reset at an allowable operating voltage or higher, an emitter connected to a power supply, and a base connected to the first input terminal. Connected to the input terminal of
PNP transistor, a grounded first NPN transistor having a base connected to the collector of the first PNP transistor, and a first NPN transistor having one end connected to the power supply and the other end connected to the collector of the first NPN transistor. , A second resistor having one end connected to the other end of the first resistor, a second PNP transistor having a collector connected to the other end of the second resistor, and a number of signals to be held, respectively. A plurality of input terminals to be input, and all the cathodes for the number of signals to be held are connected to the emitters of the second PNP transistor, and the respective anodes are connected to the plurality of input terminals, respectively. A diode; a third resistor having one end connected to the base of the second PNP transistor; and a base connected to the collector of the first NPN transistor. A second emitter-grounded NPN transistor having a collector connected to the other end of the third resistor, a relay contact having one end connected to the emitter of the second PNP transistor, and the other end grounded; And a relay coil connected to a power supply and having a multi-terminal grounded.

[0012]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention, in which n signal transmitting circuits 5-1 to 5-n, n signal receiving circuits 6-1 to 6-n, and power ON reset circuit 3
And a signal holding circuit 2. Signal receiving circuit 6-1
6-n exist in the device, respectively, and the signal transmission circuit 5
The power-on reset circuit 3 and the signal holding circuit 2 constitute a signal transmission control circuit 4. Each device apparatus, when the relay contact rl _2-1 ~rl _2-n are closed and turned as to power-on, the contacts of the relay rl _2-1 ~
The power is turned off when rl _2-n is opened.

The operation will be described below with reference to a time chart shown in FIG.

[0015] V _cc2 → commissioning in order of V _cc1, the V _cc1 reaches Oite V _{1 at} time t _1, PNP transistor to Q ₁ power-on reset circuit 3 and the signal holding circuit 2,
Q ₃ and NPN transistor Q _2, Q ₄ becomes operable. When V _cc1 reaches the operation start voltage V ₂ of the relay, the contact rl ₁ of the relay _changes from make to break, and V _cc1
There Upon reaching _{IC Z 1-1 ~Z 1-n,} Z 2-1 ~Z 2-n operation starting voltage V ₃ of, POR ^* signal is being reset "L" and is therefore, IC Z _{1 -1 to} Z _1-n and Z _{2-1 to} Z
_2-n turns on.

[0016] Next, for between POR ^* signal for a certain period of time T even after Vcc ₁ reaches V ₃ is continued to reset "L",
PNP transistor Q ₁ from time t ₁ t ₂ since no current flows to the base from the emitter of the period PNP transistor Q ₁ is turned off. PNP transistor Q ₁
But from the time t ₁ since the current does not flow and is turned off from the base of the NPN transistor Q ₂ to the emitter of the t ₂ NP
N transistor Q ₂ is turned off. When the NPN transistor Q ₂ is off, the NPN transistor Q ₄
Because it is the root of the base current flows through the emitter, PNP transistor Q ₃ and NPN transistor Q ₄ between times t ₁ ~t ₂ is in a state of ON ENABLE. POR signal past the time t ₂ releases the reset PNP transistor Q ₁ to become the "L" is turned on, also turned on NPN transistor Q _2.

[0017] (1) 2-way switch SW _3-1 ~SW _3-n wherein R side POW ON1~POW ONn signal at time t ₃ when the (remote mode) "L" → "H" → "L" Once "H", IC
Z _{6-1 to} Z _6-n and Z _{3-1 to} Z _3-n are turned on once, and the dual switches SW _3-1 are connected to the relay coils RL _{2-1 to} RL _2-n.
To SW _3-n Once current flows through a side → IC Z _3-1 ~Z _3-n in, so contact of the relay rl _2-1 ~rl _2-n is closed, each device unit to POW ON.

Next, POW OFF ^* 1 to POW OF
F ^* n signal, if in a state that does not issue a state, that is power-off signal of EPO ^* 1~EPO ^* n signal is "H",
Since ICZ _{2-1 to} Z _2-n are in the ON state, the relay coils RL _{2-1 to} RL _2-n → relay contacts rl _{2-1 to} rl _2-n
→ Double switch SW _{3-1 to} SW _3-n b side → IC Z
Current continues to flow through _{2-1 to} Z _2-n . Therefore, each device keeps the power-on state.

In this state, when V _cc1 disappears and rises again, when V _cc1 falls to V _{3 at} time t ₄ , the POR signal starts to be reset, becomes “H”, and P P
NP transistor Q ₁ is turned off, NPN transistor Q ₂ is also turned off. At this time, the PNP transistor Q ₃ and the NPN transistor Q ₄ are turned ON ENABLE.
In the E state, the relay coils RL _{2-1 to} Z _2-n → relay contacts rl _{2-1 to} rl _2-n → double switch SW _3-1 to
SW _3-n of b-side → the diode D _1-2 ~D _n-2 → Because the current flows from the emitter of the PNP transistor Q ₃ through the base → resistor R _3, PNP transistors Q ₃ and NPN
Transistor Q ₄ is turned on. Where R ₄ is Q ₁
Reference numeral ₅ denotes a bypass resistor for preventing Q ₃ from being turned on by mistake, and R ₆ and C denote bypass resistors and bypass capacitors for preventing Q ₃ from being turned on by mistake.

[0020] Next, Vcc ₁ is at time t _5, and down to the minimum operating voltage V ₄ of the relay, contact rl ₁ of the relay is closed. At this time, the PNP transistor Q ₃ and the NPN
Transistor Q ₄ will not work (off) because, NPN
Transistor Q ₃ → resistor R ₃ → NPN transistor Q ₄
Flow have current continues to flow to change the route to contact rl ₁ of the relay.

Next, when V _{cc1 rises} again at time t ₆ , when V _cc1 reaches V ₂ , the contact rl ₁ of the relay _changes from make to break. At this time, as described above, the PNP transistor Q ₃ and the NPN transistor Q ₄ are ON ENA.
Since IC Z _2-1 ~Z _2-n is in a state of BLE it does not reach the operation start voltage, current flowing through the contact rl ₁ of the relay flows changed route to the PNP transistor Q ₃ → NPN transistor Q ₄ to continue.

[0022] Therefore there is the device unit is a loop current flows through the coil RL _2-1 ~RL _2-n relay even if V _cc1 eliminates climbed again standing in the power-on state, the relay contact rl _2-1 ~ Rl _2-n maintain the make state, and each device keeps the power-on state normally.

(2) When the double switches SW _{3-1 to} SW _3-n are on the L side (local mode) At time t ₃ , the switches SW _{1-1 to} SW _1-n are closed once.
EPO ^* 1~EPO ^* n signal state, that is EP of the "H"
O ^* signal (the device apparatus remote / local power off to cause the signal irrespective) have not state a long if IC Z _4-1 ~Z _4-n which issued, since Z _1-1 ~Z _1-n which is turned on a side of the coil RL _2-1 ~RL 2-way switch to _{2-n SW 3-1 ~SW 3-} n relay → switch SW _1-1 ~SW1
_-n → ICZ _1-1 ~Z _1-n once the relay current flows contacts through rl _2-1 ~rl _2-n are closed. Relay contact r
When l _{2-1 to} rl _2-n are closed, each device is powered on.

[0024] Next, EPO ^* 1~EPO ^* n signal is "H"
IC Z _4-1 if the state _{~Z 4- n, Z 1-1 ~Z 1} -n
Are on, relay coils RL _{2-1 to} RL _2-n →
Relay contact rl _{2-1 to} Z _2-n → Double switch SW _3-1
B side of SW _3-n → switch SW _{2-1 to} SW _2-n → IC
Z _1-1 current continues to flow through to Z _1-n. Therefore, each device keeps the power-on state.

In this state, when _Vcc1 disappears and the _{power supply} rises again, the operation described in (1) _Dual switches SW _{3-1 to} SW _3-1 is described above.
Time t ₄ is the same as when W _3-n is on the R side (remote mode).
~t ₅ is PNP transistor Q ₃ → NPN transistor Q _4, time t ₅ ~t ₆ is contact rl ₁ of the relay, the time t ₆
~t _7, there is route of current flow to the PNP transistor Q ₃ → NPN transistor Q _4, therefore even the devices devices are V _cc1 eliminates climbed again standing in the power-on state, the coil of the relay RL _2- There is a loop through which current flows from _{1 to} RL _2-n , and the relay contacts rl _{2-1 to} Z _2-n
Keeps the make state, and each device keeps the power on state normally.

In the _{absence of Vcc1} , the switch SW _1-1
~ Once the SW _1-n is closed, the relay coil RL _2-1 ~
RL _2-n is connected to a side of double switches SW _{3-1 to} SW _3-n → switches SW _{1-1 to} SW _1-n → diodes D _{1-1 to} D _n-1
→ current flows through the contact rl ₁ of the relay, the contacts of the relay rl _2-1 ~rl _2-n are closed. Relay contact rl _2-1
~ Rl _2-n is closed, the relay coil RL _2-1 ~ RL
_2-n → relay contact rl _{2-1 to} rl _2-n → double switch SW _{3-1 to} SW b side of SW _3-n → switch SW _{2-1 to} SW
_2-n → Diode D _{1-1 to} D _n-1 → Relay contact rl ₁
Since the current continues to flow through each device, each device device keeps the power-on state.

Next, once the switches SW _{2-1 to} SW _2-n are once opened, there is no route for current to flow through the coils RL _{2-1 to} RL _2-n of the relay, and the relay contacts rl _{2-1 to} rl
_{Since 2-n} opens, each device is powered off. Therefore, even _if there is no _Vcc1 , if each device is set to the local mode, power can be turned on / off normally.

[0028]

As described above, according to the present invention, the resistance and N
By combining the PN transistor, the PNP transistor, the capacitor, the relay, the diode, and the thyristor, the control power supply of the signal transmission control circuit is erroneously turned off when each device is in the power-on state. Even in such a case, there is an effect that each device can be kept powered on without being powered off.

If each device is set to the local mode, each device can be normally turned on / off without turning on the control power supply of the signal transmission control circuit. There is an effect that the property can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention.

FIG. 2 is an operation time chart of the present invention.

FIG. 3 is a circuit diagram showing a conventional example.

[Explanation of symbols]

_{Z 1-1 ~Z 1-n, Z} 6-1 ~Z 6-n IC SW 1-1 ~SW 1-n, SW 2-1 ~SW 2-n switch SW _3-1 ~SW _3-n 2 communication switch _{RL 1, RL 2-1 ~RL 2-} n relay coil _{rl 1, rl 2-1 ~rl 2-} n contact D _n-1 of the relay, D _1-2 ~D _n-2 diodes Q _2, Q ₄ NPN transistors Q _1, Q ₃ PNP transistor R ₁ to R ₆ resistance 1,1-1, ... n-1,1-2, ... n-2 terminal 2 signal holding circuit 3, 30 power-on reset circuit 4, 40 signal transmission control circuit 5-1 to 5-n, 50-1 to 50-n signal transmission circuit c capacitor 6-1 to 6-n, 60-1 to 60-n signal reception circuit

Claims (1)

(57) [Claims] A first input terminal for inputting a power-on reset signal for releasing a reset at an allowable operating voltage or higher; a first PNP transistor having an emitter connected to a power supply and a base connected to the first input terminal; And the base is the first
A first NPN transistor having a common emitter connected to the collector of the PNP transistor, a first resistor having one end connected to the power supply and the other end connected to the collector of the first NPN transistor, and one end connected to the first NPN transistor. A second resistor connected to the other end of the resistor, a second PNP transistor having a collector connected to the other end of the second resistor, a plurality of input terminals for respectively inputting the number of signals to be held, and holding A plurality of diodes corresponding to the number of signals to be held are connected, with all the cathodes for the number of signals connected to the emitters of the second PNP transistor and the respective anodes connected to the plurality of input terminals, respectively, and one end connected to the second PNP transistor. A third resistor connected to the base of the transistor;
A second emitter-grounded NPN connected to the collector of the PN transistor and having the collector connected to the other end of the third resistor
A device comprising a transistor, a relay contact having one end connected to the emitter of the second PNP transistor and the other end grounded, and a relay coil connected at one end to a power supply and multi-grounded. Inter-signal circuit.