JPH0820462B2 - Direction detector - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a direction of a movable body.

2. Description of the Related Art FIG. 3 and FIGS. 4 (A) to 4 (C) show the configuration and operation waveform of a conventional direction detecting device. The function of the direction detecting device is to output a signal of motion direction information in the movable body.

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.

Problems to be Solved by the Invention However, in the conventional direction detecting device, since the operation direction output is detected only by the rising edge of the first phase of the input signal, there is only a detection accuracy equivalent to one cycle of the input signal. Had.

The present invention has been made in view of the above problems, and provides a direction detection device with improved motion direction detection accuracy.

Means for Solving the Problems In order to solve the above problems, in the direction detecting device of the present invention, a first pulse generator that generates a first pulse signal synchronized with the operation of a 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 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 configuration includes a direction detection circuit for obtaining the obtained direction.

Effect of the Invention With the above configuration, the present invention can detect the rotation direction at each edge at the time when both edges of the first pulse signal occur and at the time when both edges occur of the second pulse signal quickly and accurately. The direction detection result can be output as the operation detection direction by the output signal of the flip-flop circuit.

Embodiment An embodiment of the direction 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 (I) 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 2 is 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. 5 is a second double edge detection circuit,
It is composed of D flip-flops 50 and 51 and an exclusive OR circuit 52. 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. The D flip-flop 51 has a D flip-flop connected to the data input terminal D4.
The output signal from the output terminal Q3 of the flop 50 is input, synchronized with the rising edge of the reference clock CLK input to the clock terminal CK4, and output from the output terminal Q4. The exclusive OR circuit 52 inputs the output signal from the output terminal Q3 of the D flip-flop 50 and the output signal from the output terminal Q4 of the D flip-flop 51, and becomes a high level pulse only when they do not match. The signal c is output. 6 is a direction detection circuit, which is an inverter circuit 60 and AND circuits 61, 62, 6
3, 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 detected only when the output signal of the OR circuit 3 is at the 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. The NOR circuit 65 inputs 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, in 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, the state in which the first-phase pulse signal S1 leads the second-phase pulse signal S2 ( The OR circuit 65 outputs the signal in the first state), and the OR circuit 66 outputs the pulse signal S1 of the first phase later than the pulse signal S2 of the second phase (second state). 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. Operation direction output Y output from the NOR circuit 67 by the flip-flop circuit configured by the NOR circuits 67 and 68
Becomes a low level in the first state and becomes a high level in the second state. Since this operation direction output Y is detected at the rising and falling edges of the first-phase pulse signal S1 and the second-phase pulse signal S2, the first-phase pulse signal shown in the conventional example. It is more accurate than detecting only on the rising edge of S1.

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, the specific embodiment of the direction 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 direction detection device of the present invention, accurate detection of the output of the operation direction (direction detection) is performed at both edges of the first pulse signal and both edges of the second pulse signal. 2) is possible, that is, the simple circuit configuration enables rapid and highly accurate direction detection at many pulse edges.

[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 direction 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.

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 is in one state when the states of the first pulse signal and the second pulse signal match, and is in the other 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. And a direction detection device including a direction detection circuit that obtains an operation direction output by the output signal of the flip-flop circuit.