KR890004851Y1 - Checking circuit of cutting of electric line - Google Patents

Abstract

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Description

Disconnection Detection Circuit of Optical Position Detector

1 is a circuit diagram of the present invention.

2 is a partial output waveform diagram of the present invention, and FIG. 2 (a) is a partial output waveform diagram when cutting one line (TIME CHART) and FIG. 2 (b) is a partial output waveform diagram when cutting two lines (TIME CHART).

* Explanation of symbols for main parts of the drawings

2: Synchronization circuit 3: Up and down counter

4, 5: 2-input AND gate 6: Long-period timer circuit

R: Resistor C: Capacitor

The present invention detects the position error of the servo system by detecting whether one or two strands of the OPTICAL ENCODER are used in the position feedback circuit that forms part of the servo system. The present invention relates to a cutting line disconnection detection circuit of an optical position detector capable of preventing congestion and the like.

In general, in the servo system, when the output line of the optical position detector is cut off, it is impossible to return the position. Therefore, there are various problems such as an error phenomenon in the exact position detection and a malfunction phenomenon such as a congestion phenomenon. there was.

Therefore, in view of the above problems, the present invention detects two phase signals of the optical position detector in the body feedback circuit when the connection line with the optical position detector is cut, and determines whether the one or two strands of the optical position detector are cut. It is to be able to quickly detect and control the servo system, described in detail by the accompanying drawings as follows.

FIG. 1 shows a circuit diagram of the present invention, and FIG. 2 (a) and FIG. 2 (b) of FIG. 2 show each output waveform of the present invention. The square wave signal (i) (j) output from each phase (A phase) (B phase) of the optical position detector 1 is input to the synchronization circuit 2 of the position feedback circuit, and the optical position detector in the synchronization circuit 2 The square wave signal (i) input from each phase (A phase) (B phase) of ( ₁ ) is outputted in synchronism with the period (T ₁ ) (T ₂ ) of (j) The square wave signals (i) (j) of each phase (A phase) (B phase) of the position detector 1 are output with a phase difference of 90 phases and having the same (T ₁ = T ₂ ) period, thereby synchronizing a synchronous circuit ( The output signals (a) and (b) of 2) are output in the same period and waveform in the clockwise or counterclockwise direction of the optical position detector 1. The up and down counters of the output signals a and b of the synchronization circuit 2 are input to the up and down input terminals of the output signal a and b, and the output signals e thereof. In case (f), a signal of "HIGH" (hereinafter referred to as "H") is normally output, and when one line of each phase A or (B) of the optical position detector 1 is cut off, the synchronization circuit 2 Of the output signal (e) or (f) of the up / down counter 3 is counted as either up or down because one of the output signals (a) or (b) is not input. Is changed to " (L "), and this signal (e) (f) is a signal (h) of " H " or " L " state depending on whether one wire is cut through the two-input AND gate 4; It is also shown to be input to the microprocessor (not shown) to inform the malfunction of the servo system by telling whether the 1-line cutting.

In addition, an output signal (a) (b) of the synchronization circuit (2) is input to the two-input AND gate (5), and the long period timer circuit operates by using the output signal (g) of the two-input AND gate (5) as a trigger signal. (6) is operated to indicate the state of cutting the two wires, and the RC time constant value of the resistor R and the capacitor C of the long period timer circuit 6 is converted into the output signal of the two-input AND gate 5 ( g) If it is larger than the maximum possible period (T ₁ or T ₂ ), the output signal (K) maintains the "H" level when it is normal or when one wire is cut, and the trigger when two wires are cut. The signal is not input to the long period timer circuit 6 so that the output signal K is switched to " L " to inform the microprocessor (not shown) of the two-wire cutting state.

When the present invention of the member structure is explained by FIG. 2 (a) and FIG. 2 (b) of FIG. 2, FIG. 2 (a) of FIG. 2 shows phase A or phase B of the optical position detector 1. As an output waveform diagram showing the case where one line is cut, for example, the B phase is normal, and in the case of A phase cutting, the square wave signal (i) of the A phase at the time of cutting is not input, and accordingly, the synchronization circuit 2 The output circuit (a) also maintains the " H " state so that the up and down counters (3) count up to either up or down, resulting in an overflow or shortage phenomenon. Output (e) and (f) are inverted to each other in the "L" or "H" state, and this signal is input to the two-input AND gate 4 so that the output signal h thereof is in the "L" state. It is inverted to inform the microprocessor (not shown) of the 1-line cutting state. In the case of 1-line cutting, one side synchronization signal (a) of the synchronization circuit 2 ) Is not does not cause cutting the other sync signal (b) on the B is input to a two input AND gate 5, the output thereof is a period (T ₂₎ period (T ₂₎ by the synchronous signal (b) of the state of The trigger signal (g) to be input is input to the long period timer circuit (6). Since the time constant (R. C value) is set larger than the maximum period of the trigger signal (g), the output of the long period timer circuit (6) (k) indicates the "H" state, and the two-wire cut detection operation is not performed.

At the same time, as shown in FIG. 2 (a), when the two wires are cut off, the synchronization signal (a) (b) of the synchronization circuit 2 does not appear and the state of " H " All of the inputs of the gate 5 are in the "H" state, and the output g thereof is also maintained in the "H" state, and this signal becomes larger than the time constant (RC value) of the long period timer circuit 6 so that the long period timer circuit The output (K) of (6) is changed to the "L" state to inform the microprocessor of the 2-wire cutting state, where each output (a) (b) signal of the synchronization circuit 2 indicates the "H" state. Continuously maintained, the up and down counters 3 do not count up or down so that their outputs (e) and (f) do not appear at all, and the output of the two-input AND gate 4 is also "L". One line cutting error signal is not input to the microprocessor (not shown), so that it does not operate during two lines cutting. As such, the present invention can easily and quickly detect whether the connection line of the optical position detector is disconnected from one or two strands in the servo system, thereby completely preventing the position error or runaway phenomenon of the servo system. It is a very useful design that can improve the operation function.

Claims (2)

One-line cut detection circuit composed of up and down counters (3) and two-input AND gates (4), two-input AND gates (5), and a long period timer at each output stage of the synchronization circuit (2) of the servo system system position feedback circuit. A connection line cut detection circuit of an optical position detector, characterized in that a two-line cut detection circuit composed of a circuit (6) is connected. The time constant value RC by the resistor R and the capacitor C of the long period timer circuit 6 is set larger than the maximum period of the output of the two-input AND gate 5. Disconnection detection circuit of optical position detector.