JPH0820461B2 - Motion detector - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion detecting device for a movable body such as a rotating body or a rectilinear moving body.

Prior Art FIGS. 3 and 4 (A) to (C) show the configuration and operation waveforms of a conventional motion detection device (a rotation detection device in the case of a rotating body, a movement detection device in the case of a straight moving body). Indicates. The function of the motion detecting device is to output a signal of motion direction information in the movable body and a motion pulse signal accompanying the motion speed.

Two-phase pulse signals s2 (second phase) and pulse signals s1 (first phase) having different phases synchronized with the operation of the movable body are input to the data terminal D and the clock terminal CK of the flip-flop circuit 100, respectively, and input. The state of the input signal s2 at the rising edge of the signal s1 is detected and the operation direction output y is output from the output terminal Q. The operation direction output y becomes a low level when the first-phase pulse signal s1 is ahead of the second-phase pulse signal s2, and the first-phase pulse signal S1 lags behind the second-phase pulse signal S2. It becomes high level when it is in a closed state.
The operation pulse signal p uses the first phase (s1) of the input signal.

Problems to be Solved by the Invention However, in the conventional motion detection device, the reversal detection position may be delayed from the actual reversal position because the motion direction output is detected only by the rising edge of the first phase of the input signal. The operation direction output y is the flip-flop 10
Due to the gate delay of 0, the operation pulse signal is slightly delayed. Therefore, for example, there is a problem that a count error occurs in the next stage of the motion detection device in the case of a forward operation, and in the reverse operation, when operating an up-down type counter that performs a down-count operation. It was

In view of the above problems, the present invention provides an operation detecting device which improves the accuracy of operation direction detection and does not generate a counting error of the number of operation pulses in the counter at the next stage.

Means for Solving the Problems In order to solve the above problems, in the motion detecting device of the present invention, a first pulse generator that generates a first pulse signal synchronized with the motion of the movable body, and the movable body are provided. A second pulse generator that generates a second pulse signal having a phase different from that of the first pulse signal in synchronization with the movement of the body, the state of the first pulse signal, and the state of the second pulse signal And a logic circuit that obtains an output signal that is in one state when they do not match and that is in the other state when they do not match, and a predetermined time width at both the rising edge and the falling edge of the first pulse signal. First edge detection circuit for obtaining the output pulse signal of the second pulse signal, and the second both edge circuit for obtaining the output pulse signal of a predetermined time width at both the rising edge and the falling edge of the second pulse signal. The state of the output signal of the edge detection circuit and the logic circuit is input and held when the output pulse signal of the first both-edge detection circuit is generated, and the inverted state of the output signal of the logic circuit is detected by the second both-edge detection. A first flip-flop circuit for inputting / holding when an output pulse signal of the circuit is generated;
The operation direction of the movable body is detected at the time point when the output pulse signal of the both edge detection circuit and the time point when the output pulse signal of the second both edge detection circuit is generated, and the operation direction output is made by the output signal of the flip-flop circuit. The obtained direction detection circuit, the output pulse signal of the first both-edge detection circuit and the output pulse signal of the second both-edge detection circuit are combined to obtain the first both-edge detection circuit and the second both-edges. The configuration includes an operation pulse generation circuit that obtains an operation pulse signal that changes with a predetermined time delay from the output pulse signal generation edge of the detection circuit.

Operation According to the present invention, the output in the operation direction can be detected and output at the rising edge and the falling edge of each of the two input pulse signals having different phases by the above configuration.
Further, the operation pulse signal is always output later than the operation direction output.

Embodiment An embodiment of the motion detecting device of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit configuration diagram of an embodiment of the present invention. 2 (A) to (J) show the first
FIG. 4 is a signal waveform diagram of a main part in the figure. Reference numeral 1 is a first pulse generator, which generates a first-phase pulse signal S1 synchronized with the operation of the movable body. A second pulse generator 2 generates a second-phase pulse signal S2 having a phase different from that of the first-phase pulse signal S1 in synchronization with the operation of the movable body. Reference numeral 3 denotes an exclusive OR circuit, which outputs a signal a which becomes a high level only when the first-phase pulse signal S1 and the second-phase pulse signal S2 are input and S1 and S2 do not match. Reference numeral 4 is a first both-edge detection circuit, which is composed of D flip-flops 40 and 41 and an exclusive OR circuit 42. The D flip-flop 40 has a first phase pulse signal S1 at the data input terminal D1.
Of the reference clock C input to the clock terminal CK1
The frequency of the reference clock CLK (however, the frequency of the reference clock CLK is sufficiently higher than the frequencies of the pulse signal S1 of the first phase and the pulse signal S2 of the second phase) is synchronized and output from the output terminal Q1. The D flip-flop 41 inputs the output signal from the output terminal Q1 of the D flip-flop 40 to the data input terminal D2 and synchronizes with the rising edge of the reference clock CLK input to the clock terminal CK2 to output from the output terminal Q2. Output. The exclusive OR circuit 42 is D
The output signal from the output terminal Q1 of the flip-flop 40 and the output signal from the output terminal Q2 of the D flip-flop 41 are input, and a pulse signal b which becomes high level only when they do not match is output. Reference numeral 5 is a second both-edge detection circuit, which is a D flip-flop 50, 51 and an exclusive OR circuit 52.
It consists of. The D flip-flop 50 inputs the second phase pulse signal S2 to the data input terminal D3, synchronizes with the rising edge of the reference clock CLK input to the clock terminal CK3, and outputs from the output terminal Q3. D
The flip-flop 51 inputs the output signal from the output terminal Q3 of the D flip-flop 50 to the data input terminal D4, synchronizes with the rising edge of the reference clock CLK input to the clock terminal CK4, and outputs from the output terminal Q4. To do. The exclusive OR circuit 52 outputs the output signal from the output terminal Q3 of the D flip-flop 50 and the D flip-flop 51.
The output signal from the output terminal Q4 is input to output the pulse signal c which becomes high level only when there is a mismatch. 6 is a direction detection circuit, which is an inverter circuit 60 and an AND circuit 6
1, 62, 63, 64, OR circuits 65, 66 and NOR circuits 67, 68. The inverter circuit 60 inputs the output signal of the exclusive OR circuit 3 and outputs an inverted signal. The AND circuits 61 and 63 receive the output signal b of the first both-edge detection circuit 4, and the AND circuit 61 outputs the exclusive OR circuit 3 only when the output signal is high level. The output signal b of the first both-edge detection circuit 4 is output only when the output signal of the OR circuit 3 is low level. The AND circuits 62 and 64 receive the output signal c of the second both-edge detection circuit 5, and the AND circuit 62 outputs the exclusive OR circuit 3 only when the output signal of the exclusive OR circuit 3 is low level. Only when the output signal of the OR circuit 3 is at the high level, the output signal c of the second both edge detection circuit 5 is output. Noah circuit
65 receives the output signals of the AND circuits 61 and 62 and outputs a combined output signal d. The NOR circuit 66 inputs the output signals of the AND circuits 63 and 64 and outputs a combined output signal e. Therefore, the pulse signal in which the rising and falling edges of the first-phase pulse signal S1 and the second-phase pulse signal S2 are detected is the first-phase pulse signal S1 being the second-phase pulse signal.
In the state (first state) in which S2 is advanced, the NOR circuit 65 outputs the pulse signal S1 of the first phase to the pulse signal of the second phase.
In the state delayed from S2 (second state), it is output from the NOR circuit 66. The output signal d of the OR circuit 65 is input to the NOR circuit 67, and the output signal e of the OR circuit 66 is input to the NOR circuit 68. Flip composed of NOR circuit 67, 68
The operation direction output Y output from the NOR circuit 67 by the flop circuit is low level in the first state and high level in the second state. This operation direction output Y is the pulse signal S1 of the first phase and the pulse signal of the second phase.
Since the detection is performed at the rising and falling edges of S2, the pulse signal S1 of the first phase shown in the conventional example is shown.
It is more accurate than detecting only on the rising edge of. Reference numeral 7 is an operation pulse generation circuit, which is composed of an OR circuit 70, an inverter circuit 71, and a D flip-flop 72. The NOR circuit 70 inputs the output signal b of the first both-edge detection circuit 4 and the output signal c of the second both-edge detection circuit 5 and outputs a logical sum. The inverter circuit 71 inputs the reference clock CLK and outputs an inverted signal. D flip
The flop 72 inputs the output signal of the NOR circuit 70 to the data terminal D5, synchronizes with the rising edge of the output signal of the inverter circuit 71, and outputs the operation pulse signal P from the output terminal Q5. The operation pulse signal P is the first both-edge detection circuit 4
2 and the output signal c of the second both edge detection circuit 5 are pulse signals delayed by a half cycle of the reference clock CLK. The operation direction is detected by the first both-edge detection circuit 4
The output of the output signal b and the output signal c of the second both-edge detection circuit 5 are performed at the rising edges, so that the operation pulse signal P is always generated later than the operation direction output Y. Since the operation pulse signal P is a pulse signal in which the rising and falling edges of the first-phase pulse signal S1 and the second-phase pulse signal S2 are detected, the operation pulse signal P has a frequency four times that of the operation pulse signal shown in the conventional example. That is, it means that the frequency is multiplied by 4.

As described above, according to the present embodiment, the disagreement between the pulse signal of the first phase and the pulse signal of the second phase, which are synchronized with the operation of the movable body, is changed to the input pulse signal of the first phase and the input pulse of the second phase. By detecting at both the rising and falling edges of the signal, it is possible to obtain a highly accurate output in the operating direction. Further, by delaying the output pulse signal of the both edge detectors by a predetermined time width to obtain the operation pulse signal, it is possible to obtain the operation pulse signal which is always output later than the operation direction output. Further, the specific embodiment of the operation detecting device of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without changing the gist of the present invention.

EFFECTS OF THE INVENTION As described above, according to the operation detecting device of the present invention, (A) Accurate detection of the output in the operation direction at the time when both edges of the first pulse signal and the time when both edges of the second pulse signal occur Will be possible.

(B) It is possible to generate an accurate operation pulse signal at the time when both edges of the first pulse signal occur and at the time when both edges of the second pulse signal occur.

(C) With a simple circuit configuration, the above-described accurate operation direction output and operation pulse signal are produced at many pulse edges, and highly accurate operation detection is possible.

It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIG.
FIG. 3 is a signal waveform diagram of a main part in the figure, FIG. 3 is a circuit configuration diagram of a conventional operation detecting device, and FIG. 4 is a signal waveform diagram in FIG. 1 ... First pulse generator, 2 ... Second pulse generator, 3 ... Exclusive OR circuit, 4 ... First double-edge detection circuit, 5 ... Second double-edge detection circuit , 6 ... Direction detection circuit, 7 ... Operation pulse generation circuit.

Claims (1)

[Claims] 1. A first pulse generator for generating a first pulse signal synchronized with the operation of a movable body, and a second pulse generator having a phase different from that of the first pulse signal in synchronization with the operation of the movable body. A second pulse generator that generates a pulse signal and one state when the state of the first pulse signal and the state of the second pulse signal match, and one state when they do not match. A logic circuit for obtaining an output signal, a first both-edge detecting circuit for obtaining an output pulse signal having a predetermined time width at both the rising edge and the falling edge of the first pulse signal, and the second pulse A second both-edge detection circuit that obtains an output pulse signal of a predetermined time width at both the rising edge and the falling edge of the signal, and a state of the output signal of the logic circuit, that is, the first both-edge detection circuit. Input and held in the output pulse signal generating circuit, and inputting the inverted state of the output signal of the logic circuit when the output pulse signal generator of the second both-edge detection circuit
A flip-flop circuit for holding is included, and the operation direction of the movable body is detected at the output pulse signal generation time of the first both-edge detection circuit and the output pulse signal generation time of the second both-edge detection circuit. Then, a direction detection circuit that obtains an operation direction output from the output signal of the flip-flop circuit, an output pulse signal of the first both-edge detection circuit, and an output pulse signal of the second both-edge detection circuit are combined, An operation detection device comprising an operation pulse generation circuit that obtains an operation pulse signal that changes with a predetermined time delay from the output pulse signal generation edges of the first both-edge detection circuit and the second both-edge detection circuit.