JPH0546651B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] Each time a pulse is input, the on/off state is reversed,
When in the on state, connect the common terminal and the on terminal,
A signal conversion circuit that connects the common terminal and the off terminal when in the off state is realized with a simple circuit configuration of four relays, and also connects the common terminal and the on and off terminals when the power is off or in the initial state. The open state is different from the on state and off state to prevent malfunction of the next stage circuit.

[Industrial application field]

The present invention relates to improvements in signal conversion circuits used in control devices such as display devices for communication electronic equipment.

The above-mentioned signal conversion circuit has a simple circuit configuration, and when the power is turned off or in the initial state, the common terminal, on terminal, and off terminal are in an open state, and the state is different from the on state and off state, thereby preventing malfunction of the next stage circuit. It is desirable to be able to prevent this.

[Conventional technology]

FIG. 3 is a circuit diagram of a conventional signal conversion circuit, and FIG. 4 is a time chart of the operation of the circuit shown in FIG.

In the figure, 1 is FF, 2 is initial setting circuit, 3 is buffer, 4 is off terminal, 5 is on terminal, 6 is common terminal, 7 is reset terminal, R1 to R3 are resistors, V
1, V2 is a power supply, Tr is a transistor, RL is a relay, r1 is a contact of the relay RL, and C is a capacitor.

To explain the operation, when the power supplies V1 and V2 are turned on as shown in FIG. 4A, the output of the initial setting circuit 2 is turned on as shown in FIG. 4D, clearing FF1, and output Q is on. It is also off even if it is off.

Next, when a pulse is input from the pulse input as shown in FIG. 4B, the output Q of FF1 is turned on and off alternately as shown in FIG. 4E, the transistor Tr is turned on and off accordingly, and the relay RL is turned on and off as shown in FIG. F
It turns on and off as shown in .

As a result, the contact r1 is turned on and off accordingly, and the connection between the on terminal 5 and the common terminal 6 is
The connection between the off terminal 4 and the common terminal 6 is turned on and off as shown in FIG.

Therefore, when the first pulse is input, the signal from the common terminal 6 is output from the ON terminal 5, and when the next pulse is input, it is output from the OFF terminal 4. This operation is repeated alternately, and the signal is converted.

As shown in Fig. 4C, when the reset terminal 7 is grounded and a pulse is input, the output of the initial setting circuit 2 turns off as shown in Fig. 4D, and even if the output Q of FF1 is on, It turns off and returns to its initial state.

[Problem that the invention seeks to solve]

However, in the case of FIG. 3, as shown in FIG. 4H, the off terminal 4 remains connected to the common terminal 6 both when the power is off and during the initial state when the power is on and no pulse has been input yet. Yes, the signal input from common terminal 6 is output from off terminal 4,
In the next stage circuit connected to these terminals, there is a problem that it is difficult to distinguish between the input pulse and the off state, which may cause malfunction, and the circuit becomes complicated as an initial setting circuit is also required. There is a problem.

[Means for solving problems]

The above problem is that the first to fourth relays are provided, the common terminal is connected to one of the contacts of the first to fourth relays, and the other of the contacts of the first and third relays is connected to the on terminal. The other of the contacts of the second and fourth relays is OR-connected with the OFF terminal. When the power is turned off and in the initial state, each contact is left open, and the first pulse turns off the first relay. the second pulse turns on the contacts of the relay, the second pulse turns on the contacts of the relay, and the first relay turns off, and the third pulse turns the third relay on. The relay is turned on, the contacts of the relay are turned on, and the second relay is turned off, and the fourth pulse is turned on, the contacts of the relay are turned on, and the third relay is turned on. This problem is solved by the signal conversion circuit of the present invention, which repeats such an operation by turning off the signal.

[Effect]

According to the present invention, when the power is turned off and in the initial state, the on terminal and the off terminal are in an open state from the common terminal, and after a pulse is input, the on terminal and the off terminal are respectively connected to the common terminal. Therefore, the next stage circuit does not malfunction, does not require an initial setting circuit, and the signal conversion circuit can be constructed with four relays, resulting in a simple circuit configuration.

〔Example〕

FIG. 1 is a circuit diagram of a signal conversion circuit according to an embodiment of the present invention, and FIG. 2 is a time chart of the operation of the circuit of FIG.

In the diagram, RLA, RLB, RLC, RLD are relays, r1
a-1 to r1a-4, r1b-1 to r1b-4,
r1c-1 to r1c-4, r1d-1, r1d-
2, r1d-4 are relays RLA, RLB,
RLC, RLD settings, +V is power supply, 4, 5, 6, 7
1 shows an OFF terminal, an ON terminal, a common terminal, and a reset terminal as in the conventional example, and in this case, the reset terminal 7 is normally grounded.

To explain the operation, as shown in Figure 2A, the power supply +
Even if V is turned on, contacts r1a-4, r1b-
4, r1c-4, and r1d-4 are open until a pulse is input, just as when the power is not turned on, and the connection status of the on terminal 5, off terminal 4, and common terminal 6 is shown in Figure 2. It is in the off state as shown in J and K.

Next, as shown in Figure 2B, when pulses are input sequentially and the pulse input terminal is grounded, relay RLA,
RLB, RLC, and RLD are sequentially shown in Figure 2 D, E, F, and G.
The relay is turned on as shown in the figure, but the self-holding state of the relay continues until the next relay is activated by the next pulse, and when the next relay is turned on, this relay is turned off.

Therefore, when relays RLA and RLC are on, contacts r1a-4 and r1c-4 are on as shown in FIG. 2H, and when relays RLB and RLD are on, contact r1b-4 is on. , r1d-4 are turned on as shown in FIG. 2I, and the ON terminal 5 is connected to the contact r1a-4 or r1c- as shown in FIG. 2J.
4 is on, it is connected to the common terminal 6,
The off terminal 4 is connected to the contact r1b- as shown in FIG. 2K.
4 or r1d-4 is connected to the common terminal 6 while it is on.

As shown in FIG. 2C, when the reset terminal 7 is turned off, the front part of the relay is turned off and the relay is in its initial state.

In this way, every time a pulse is input, the signal input from the common terminal 6 is transferred to the on terminal 5 in the on state.
Therefore, in the off state, the output is output from the off terminal 4 to the next stage, and in the power off and initial state, both the on terminal 5 and the off terminal 4 are not connected to the common terminal 6, which prevents the next stage circuit from malfunctioning. This does not occur, and even without an initial setting circuit, the desired operation can be performed, and a signal conversion circuit with a simple circuit configuration as shown in FIG. 1 can be realized.

[Effects of the Invention] As explained in detail above, according to the present invention, when the power is off and in the initial state, both the on terminal and the off terminal are not connected to the common terminal, so that the next stage circuit does not malfunction. Moreover, there is an effect that a signal conversion circuit with a simple circuit configuration can be realized without the need for an initial setting circuit.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a signal conversion circuit according to an embodiment of the present invention, FIG. 2 is a time chart of the operation of the circuit of FIG. 1, and FIG. 3 is a circuit diagram of a conventional signal conversion circuit.
FIG. 4 is a time chart of the operation of the circuit of FIG. In the figure, 1 is FF, 2 is initial setting circuit, 3
is a buffer, 4 is an off terminal, 5 is an on terminal, 6 is a common terminal, 7 is a reset terminal, V1, V2, +V
is a power supply, R1 to R3 are resistors, C is a capacitor,
Tr is a transistor, RL, RLA, RLB, RLC,
RLD is a relay, r1, r1a-1 to r1a-
4, r1b-1 to r1b-4, r1c-1 to r1
c-4, r1d-1, r1d-2, and r1d-4 indicate contacts of relays RL, RLA, RLB, RLC, and RLD, respectively.

Claims (1)

[Claims] 1. Each time a pulse is input, the on/off state is inverted, and when the on state is on, the common terminal and the on terminal are connected, and when the off state is, the common terminal and the off terminal are connected. , comprising first to fourth relays, connecting the common terminal and one of the contacts of the first to fourth relays, and OR-connecting the other of the contacts of the first and third relays to the ON terminal. Then, the other of the contacts of the second and fourth relays is OR-connected to the OFF terminal, and each contact is left open when the power is turned off and in the initial state, and the first pulse is turned on to turn on the first relay. A contact of a relay is turned on, a second pulse turns on the second relay, turns on a contact of the relay, and turns off the first relay, and a third pulse turns on the third relay. As a fourth pulse, the contacts of the relay are turned on and the second relay is turned off, and the fourth pulse is turned on and the contacts of the relay are turned on, and the third relay is turned off. , a signal conversion circuit characterized in that such an operation is repeated.