JPH01174971A - Operation detector - Google Patents

Abstract

PURPOSE:To achieve a higher detection accuracy, by detecting an operating direction output at both edges of two phases of pulse signals with a difference phase synchronizing a mobile body. CONSTITUTION:Among pulse signals (a) and (b) detecting the rising and falling edges of first and second phase pulse signals S1 and S2, those detecting the rising edge of the signals S1 and S2 are outputted from AND circuit 601 and 604 at a first state in which the signal S1 advances ahead of the S2 and from AND circuits 600 and 605 at a second state in which it is delayed therefrom. Among the signals (a) and (b), those detecting the falling edges of the signals S1 and S2 are outputted from AND circuits 602 and 607 at the first state and from AND circuits 603 and 606 at the second state. An OR circuit 608 receives output signals inputted from the circuit 600, 603, 605 and 606 to output a signal (c) and an OR circuit 609 receives output signals inputted from the circuits 601, 602, 604 and 607 to output a signal (d). The signals (c) and (d) are inputted into NOR circuits 610 and 611 and an operating direction output Y from the circuit 611 turns to 'L' or 'H' at the first or second state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a motion detection device for a movable body such as a rotating body or a rectilinear moving body.

Conventional technology Figures 3 and 4 (A) to (C) show a conventional motion detection device (
The configuration and operation waveforms of a rotation detection device in the case of a rotating body and a movement detection device in the case of a rectilinear moving body are shown. The motion detection device works on movable objects.

The purpose of this is to output a motion direction information signal and a motion pulse signal associated with the motion speed.

A two-phase pulse signal s2 (second phase) and a pulse signal sl (first phase) of different phases synchronized with the operation of the movable body are input to the data terminal and clock terminal CK of the flip-flop circuit 100, respectively. The state of the input signal S2 at the rising edge of the signal S1 is detected and the operating direction output y is output from the output terminal Q. The operating direction output y is the first
When the phase pulse signal sl is ahead of the second phase pulse signal S2, it becomes a low level, and when the first phase pulse signal S1 lags behind the second phase pulse signal S2, it becomes a high level. . The operation pulse signal p uses the first phase (Sl) of the input signal.

Problems to be Solved by the Invention However, in the conventional motion detection device, since the motion direction output is detected only by the rising edge of the first phase of the input signal, the reversal detection position may lag behind the actual reversal position. Moreover, the operating direction output y is the flip-flop 10
Due to the gate delay of 0, it lags slightly behind the operating pulse signal. For this reason, for example, if the next stage of the motion detection device operates an up-down counter that counts up when the motion is in the forward direction and counts down when the motion is in the reverse direction, a problem arises in that a counting error occurs. Ta.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a motion detection device that increases the accuracy of motion direction detection and does not cause a counting error in the number of motion pulses in the next stage counter.

Means for Solving the Problems In order to solve the above problems, the motion detection device of the present invention includes:
a first pulse generator that generates a first pulse signal synchronized with the movement of the movable body; and a second pulse signal that generates a second pulse signal that is different in phase from the first pulse signal in synchronization with the movement of the movable body. a second pulse generator; a first edge detection circuit for obtaining a pulse signal having a predetermined time width that changes at the rising edge and falling edge of the first pulse signal; and a rising edge of the second pulse signal; a second edge detection circuit that obtains a pulse signal of a predetermined time width that changes at an edge and a falling edge, and latches the other signal when an edge of one of the first pulse signal and the second pulse signal occurs; a signal latch circuit configured to include a plurality of flip-flop circuits, and output signals of the plurality of flip-flop circuits of the signal latch circuit to the first pulse signal, the second pulse signal, and the signal latch circuit; a direction detection circuit including a flip-flop circuit selected and input according to the output signal of the first double edge detection circuit and the output signal of the second double edge detection circuit; The present invention includes an operation pulse generation circuit that obtains an operation pulse signal that is a combination of the pulse signal of the edge detection circuit and the pulse signals of both of the second edge detection circuits.

Operation The present invention can detect and output the operating direction output at the rising edge, rising edge, and falling edge of each of two input pulse signals having different phases with the above-described configuration. Further, the operation pulse signal is always outputted later than the operation direction output.

Embodiment Hereinafter, an embodiment of the motion detection device of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of an embodiment of the present invention. 2(A) to 2(1) are main part signal waveform diagrams in FIG. 1. 1 is a first pulse generator, which generates a first phase pulse signal S1 synchronized with the operation of the movable body.

2 is a second pulse generator, which generates a second pulse signal having a phase different from the first phase pulse signal S1 in synchronization with the operation of the movable body.
A phase pulse signal S2 is generated. Reference numeral 3 designates a first double edge detection circuit, which is composed of D flip-flops 30 and 31 and an exclusive OR circuit 32. D flip
The flop 30 converts the first phase pulse signal S1 into a reference clock CLK (however, the frequency of the reference clock CLK is sufficiently higher than the frequencies of the first phase pulse signal S1 and the second phase pulse signal S2). Output is synchronized by a rising edge. D flip-flop 31 is D
The output signal from the output terminal Q1 of the flip-flop 30 is synchronized with the rising edge of the reference clock CLK and output. The exclusive OR circuit 32 inputs the output signal from the output terminal Q1 of the D flip-flop 30 and the output signal from the output terminal Q2 of the D flip-flop 31, and calculates the rising edge of the first phase pulse signal S1. and outputs a pulse signal a whose falling edge is detected. 4 is a second double edge detection circuit, which is a D-flip
It is composed of flops 40 and 41 and an exclusive OR circuit 42. The D flip-flop 40 synchronizes the second phase pulse signal S2 with the rising edge of the reference clock CLK and outputs it. D flip flop 4
1 synchronizes the output signal from the output terminal Q3 of the D flip-flop 40 with the rising edge of the reference clock CLK and outputs it.

The exclusive OR circuit 42 inputs the output signal from the output terminal Q3 of the D flip-flop 40 and the output signal from the output terminal Q4 of the D flip-flop 41, and calculates the rising edge of the second phase pulse signal S2. and outputs a pulse signal whose falling edge is detected. 5 is a signal latch circuit, D flip-flop 50.51.52
and 53. D flip flop 5
0 latches the second phase pulse signal S2 at the rising edge of the first phase pulse signal Sl, and the D flip-flop 51 latches the second phase pulse signal S2 at the falling edge of the first phase pulse signal S1. Latch S2. The D flip-flop 52 latches the first phase pulse signal S1 at the rising edge of the second phase pulse signal S2, and
The flip-flop 53 latches the first phase pulse signal S1 at the falling edge of the second phase pulse signal S2. 6 is a direction detection circuit, and an AND circuit 600.6
01.602.603.604゜605, 606.60
7 and OR circuits 608, 609 and NOR circuits 610, 61
1. Among the pulse signals a in which the rising edge and falling edge of the first phase pulse signal S1 are detected, the pulse signal in which the rising edge of the first phase pulse signal S1 is detected is such that the first phase pulse signal S1 is A state that is more advanced than the pulse signal S2 (first state)
In this case, the pulse signal S1 of the first phase is output from the AND circuit 601, and in the state where the first phase pulse signal S1 lags the pulse signal S2 of the second phase (second state B), the pulse signal S1 is output from the AND circuit 600. Among the falling edge of the first phase pulse signal S1 and the pulse signal a that detected the falling edge, the pulse signal that detected the falling edge of the first phase pulse signal S1 is as follows:
In the first state, it is output from the AND circuit 602, and in the second state, it is output from the AND circuit 603. The second phase pulse signal S2 of the pulse signals that detected the rising edge and falling edge of the second phase pulse signal S2
The second of the pulse signals that detected the rising edge of
A pulse signal that detects the rising edge of the phase pulse signal S2 is output from the AND circuit 604 in the first state, and is output from the AND circuit 605 in the second state.

Among the pulse signals that detect the rising edge and falling edge of the second phase pulse signal S2, the pulse signal that detects the falling edge of the second phase pulse signal S2 is output from the AND circuit 607 in the first state. and the second
In this state, the AND circuit 606 outputs the signal. NOR circuit 608 is AND circuit 600.603.605 and 606
It inputs the output signals of and outputs the combined output signal C. NOR circuit 609 is AND circuit 601.602.604
and 607 output signals, and synthesized output signal d
Output. Therefore, the pulse signals that detect the rising and falling edges of the first-phase pulse signal S1 and the second-phase pulse signal S2 are in a state where the first-phase pulse signal S1 is ahead of the second-phase pulse signal S2 ( In the first state), the OR circuit 609 outputs the first phase pulse signal S1
is delayed from the second phase pulse signal S2 (second state), it is output from the OR circuit 608. OR circuit 6
The output signal C of 0B is input to the NOR circuit 610, and the output signal d of the OR circuit 609 is input to the NOR circuit 611.

A flip circuit composed of NOR circuits 610 and 611
The operation direction output Y outputted by the NOR circuit 611 by the flop circuit is at a low level in the first state, and at a high level in the second state. This operation direction output Y is the first phase pulse signal shown in the conventional example because detection is performed at the rising and falling edges of the first phase pulse signal S1 and the second phase pulse signal S2. The accuracy is higher than when detecting only the rising edge of S1. 7 is an operation pulse generation circuit, which is a NOR circuit 7
0 and D flip-flops 71. The NOR circuit 70 inputs the output signal a of the first both edge detection circuit 3 and the output signal S of the second both edge detection circuit 4 and outputs a logical sum. The D flip-flop 71 synchronizes the output signal of the NOR circuit 70 at the falling edge of the reference clock CLK and outputs an operation pulse signal P. The operation pulse signal P is a pulse signal that is delayed by a half cycle of the reference clock CLK with respect to the output signal a of the first double edge detection circuit 3 and the output signal a of the second double edge detection circuit 4. The operating direction is detected by the rising edge of the output signal a of the first double edge detection circuit 3 and the output signal S of the second double edge detection circuit 4, so the motion pulse signal P is detected.
always occurs later than the motion direction output Y. Furthermore, since the operating pulse signal P is a pulse signal that detects the rising and falling edges of the first phase pulse signal S1 and the second phase pulse signal S2, the frequency is four times that of the operating pulse signal shown in the conventional example. In other words, it has doubled by 4 weeks.

As described above, according to this embodiment, the phase relationship between the first phase pulse signal and the second phase pulse signal synchronized with the operation of the movable body is determined by the first phase input pulse signal and the second phase input pulse signal. By detecting both the rising and falling edges of the signal, a highly accurate operating direction output can be obtained.

Further, by delaying the output pulse signals of both edge detection sections by a predetermined time width to generate the operation pulse signal, it is possible to obtain an operation pulse signal that is always output later than the output in the operation direction. Further, the specific embodiments of the motion detection device of the present invention are not limited to the above-described embodiments, and various modifications can be made without changing the gist of the present invention.

Effects of the Invention As described above, according to the motion detection device of the present invention, the motion direction output can be detected at both edges of two-phase pulse signals of different phases that are synchronized with the motion of the movable body, thereby improving the accuracy of direction detection. be able to.

In addition, since the operation pulse signal is always output later than the operation direction output, an excellent effect can be obtained in that a counting error does not occur in the next stage counter.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram of an embodiment of the present invention, Fig. 2 is a signal waveform diagram of the main part in Fig. 1, and Fig. 3 is a diagram of a conventional direction detecting device. Circuit configuration diagram, Figure 4
f# is a signal waveform diagram in FIG. 3; 1...First pulse generator, 2...Second pulse generator, 3...First both edge detection circuit, 4...... Second double edge detection circuit, 5...
... Signal latch circuit, 6 ... Operation detection circuit, 7 ... Operation pulse generation circuit. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 2

Claims (1)

[Claims] a first pulse generator that generates a first pulse signal synchronized with the movement of the movable body; and a second pulse signal that generates a second pulse signal that is different in phase from the first pulse signal in synchronization with the movement of the movable body. a second pulse generator; a first double-edge detection circuit that obtains a pulse signal with a predetermined time width that changes at the rising edge and falling edge of the first pulse signal; and a rising edge of the second pulse signal; a second double-edge detection circuit that obtains a pulse signal with a predetermined time width that changes at an edge and a falling edge, and latches the other signal when one edge of the first pulse signal and the second pulse signal occurs. a signal latch circuit configured to include a plurality of flip-flop circuits, and output signals of the plurality of flip-flop circuits of the signal latch circuit to the first pulse signal, the second pulse signal, and the signal latch circuit; a direction detection circuit including a flip-flop circuit selected and input according to the output signal of the first double edge detection circuit and the output signal of the second double edge detection circuit; A motion detection device comprising an operation pulse generation circuit that obtains an operation pulse signal that is a combination of a pulse signal of an edge detection circuit and a pulse signal of both of the second edge detection circuits.