JPH0865754A - Amplifier circuit for single-acting input signal - Google Patents

Abstract

PURPOSE: To provide an amplifier circuit unifying signal amplification and logic conversion and with inexpensive constitution. CONSTITUTION: Photocouplers 21 to 2n are turned on/off corresponding to a no-voltage on/off signal inputted from the outside to input terminals 11 to 1n, and a logic signal based on a DC of 5V is outputted to an internal circuit. On the other hand, the no-voltage on/off signal is inputted by branching to an OR logic part 7 via diodes 5 to 5n for signal current sneak prevention. The OR logic part 7 generates plural patterns of OR logic arbitrarily by the strap wiring of a circuit, and introduces the output to an AND logic part 10 via MOS relays 81 to 8n. The AND logic part 10 generates plural patterns of AND logic arbitrarily by the strap wiring. and outputs them to an external circuit via output terminals 111 to 11n.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-acting input signal amplifying circuit used in a device having an electric control circuit such as a remote monitoring control device, and more particularly to a single-acting input signal for controlling and monitoring a single-acting input signal. The present invention relates to a single-acting input signal amplifier circuit having both a function of transferring to an internal circuit and another external circuit and a function of amplifying and converting a single-acting input signal.

[0002]

2. Description of the Related Art In a remote monitoring control device having an electric control circuit, when a single-action input signal fetched from the outside is guided to an internal circuit for control and monitoring or another external circuit, amplification and logical conversion of the single-action input signal is performed. It may cost. In the conventional device of this type, the signal amplification unit for performing the amplification logic conversion and the logic conversion unit are configured by being divided into separate units, respectively, and the logic conversion itself is almost fixed and can be easily changed. However, this is not the case (see JP-A-2-70243).

[0003]

As described above, since the signal amplifying section and the logic converting section are conventionally constituted by separate units, it is not possible to save the mounting space and cost in the distant monitoring control device or the like. Moreover, since the logic conversion is fixed, it is necessary to rearrange the logic each time, and there is a problem of lacking versatility.

In view of the above problems, the present invention provides a single-acting input signal amplifying circuit that integrates signal amplification and logic conversion and is easy to perform logic conversion.

[0005]

A single-acting input signal amplifying circuit according to the present invention has an input terminal for taking n (natural number) single-acting input signals in parallel and the single-acting input signal taken from the input terminals. The n isolation elements that are electrically isolated from each other and lead to the internal circuit, and the single-action input signals input from the input terminals are branched and input to generate m (≦ n) first logic signals. A first logic circuit that outputs the signals in parallel, a semiconductor relay circuit that electrically isolates the output signals of the first logic circuit and outputs the signals in parallel, and based on the output signal of the semiconductor relay circuit A second logic circuit that generates k (≦ m) second logic signals having a logic different from that of the first logic signal and outputs the second logic signals in parallel, and an output signal of the second logic circuit as an external circuit. Output terminals for parallel output to And, characterized in that the integration of the signal amplification and the logic conversion function.

In the above structure, the semiconductor relay circuit receives, for example, the first logic signal and selectively outputs a plurality of MOS (metal oxide semiconductor).
), The signal amplification can be easily performed. Further, the first logic circuit and the second logic circuit are configured to generate and output a logic signal by arbitrarily combining the signals introduced from the previous stage circuit by the strap wiring, thereby easily changing the logic conversion. It becomes possible.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an amplifier circuit for a single acting input signal according to an embodiment of the present invention. In the case where a photocoupler is used as an isolation element and a semiconductor relay circuit includes a MOS relay. For example:

In FIG. 1, 11 to 1n are input terminals and 2
1 to 2n are photocouplers, 31 to 3n are photocoupler input current limiting resistors, 41 to 4n are photocoupler output pull-up resistors, 51 to 5n are signal current sneak prevention diodes, and 6 is an external output unit. 7 is an OR logic part, 81
8n is a MOS relay, 91-9n is a MOS relay input current limiting resistor, 10 is an AND logic unit, 111-11
n is an output terminal.

A first DC voltage (DC24V) is connected to the n input terminals 11 to 1n via photocouplers 21 to 2n and photocoupler input current limiting resistors 31 to 3n, respectively. When a voltage ON signal is input, the photocoupler connected to the input terminal is ON, and the secondary side (output side) is conductive, while when a no-voltage OFF signal is input, the photocoupler is OFF and the photocoupler is cut off. It is like this.

A second DC voltage (DC5V) is connected to the secondary sides of the photocouplers 21 to 2n via photocoupler output pull-up resistors 41 to 4n, respectively, and the secondary sides are in a conductive state. A signal of logic "1" is sometimes led to the internal circuit when it is in the cutoff state.

In the single-acting input signal amplifying circuit having such a configuration, the corresponding photocouplers 21-2n are driven by the non-voltage ON / OFF signal (single-acting input signal) externally input in parallel to the input terminals 11-1n. It is turned on / off and a logic signal corresponding to these single-action input signals is introduced to the monitoring internal circuit. These single-acting input signals are also branched and input to the external output section 6 via the signal current sneak-preventing diodes 51 to 5n, where they are amplified and logically converted and output terminal 111.
To 11n.

The first stage OR logic unit 7 of the external output unit 6 is capable of arbitrarily generating a plurality of OR logics by the strap wiring of the circuit, and its output terminals are MOS relays 81 to 8 respectively.
n is connected to one end on the primary side. The broken line in the figure is O
It is an example of R logic. Each MOS relay 81 ~
The above-mentioned first DC voltage is connected to the other end of the primary side of 8n, and only the MOS relay that is in conduction with the OR logic output connected to the input terminal where the no-voltage signal is ON is turned on and the logic "1" is output. Is output to the AND logic unit 10 in the subsequent stage.

The AND logic unit 10 is capable of arbitrarily generating a plurality of AND logics by strap wiring of the circuit. The broken line in the figure shows an example of AND logic, and this logic signal is guided to the external circuit via the output terminals 111 to 11n.

As described above, in the single-action input signal amplifier circuit of this embodiment, the non-voltage ON / 0FF signal input from the outside is electrically isolated for the internal circuit and the external circuit. Amplifies and AND with AND logic unit 7 that can be easily changed by strap wiring of the circuit
By having the logic unit 10, it is possible to realize an inexpensive circuit that integrates signal amplification and logic conversion functions.

In this embodiment, the MOS relays 81-
The example in which the OR logic unit 7 is arranged in the previous stage of 8n and the AND logic unit 10 is arranged in the latter stage has been described, but these logic units can be reversed. Further, in this embodiment, the input terminal 1
1-1n, photocouplers 21-2n, MOS relay 81
.About.8n and n output terminals 111 to 11n have been described, but the numbers are not necessarily the same.

[0017]

As is apparent from the above description, the single-acting input signal amplifier circuit of the present invention uses a semiconductor relay such as a MOS relay to electrically supply an external input signal to an internal circuit and an external circuit, respectively. Has a first logic part and a second logic part that can be easily changed by strap wiring of the circuit, as well as amplifying the isolated signal, so that the signal amplification and logic conversion functions are integrated and remote monitoring control is performed. This has the effect of effectively utilizing the mounting space for devices and the like. Also,
Since the logic conversion can be changed easily, it is possible to realize a versatile single-acting signal amplifier circuit.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a single-action input signal amplifier circuit according to an embodiment of the present invention.

[Explanation of symbols]

 11-1n Input terminal 21-2n Photocoupler 31-3n Photocoupler input current limiting resistor 41-4n Photocoupler output current limiting resistor 51-5n Signal current sneak prevention diode 6 External output section 7 OR logic section 81-8n MOS Relay 91-9n MOS relay input current limiting resistor 10 AND logic part 111-11n output terminal

Claims (3)

[Claims] 1. An input terminal for taking in n (natural number) single-action input signals in parallel, and n isolator for electrically isolating the single-action input signals taken in from the input terminals and leading them to an internal circuit. The first operation signal is generated by branching and inputting the single-action input signal input from the input element and the single-action input signal from the input terminal to generate m (≦ n) first logic signals, and outputting these in parallel.
Logic circuit, a semiconductor relay circuit that electrically isolates the output signals of the first logic circuit and outputs the signals in parallel, and a logic different from the first logic signal based on the output signal of the semiconductor relay circuit. A second logic circuit that generates k (≦ m) second logic signals and outputs the second logic signals in parallel, and an output terminal that outputs the output signal of the second logic circuit to an external circuit in parallel. An amplifier circuit for a single-acting input signal having. 2. The semiconductor relay circuit comprises a plurality of MOSs for inputting the first logic signal and selectively outputting the first logic signal.
A single-acting input signal amplifier circuit comprising a relay. 3. The single-acting circuit is characterized in that the first logic circuit and the second logic circuit are configured to generate and output a logic signal by arbitrarily combining the signals introduced from the preceding circuit by strap wiring. Amplifier circuit for input signal.