CN201051734Y - A step electromotor control stroke secure protection circuit - Google Patents

Abstract

The utility model discloses a stroke-controlled safe protection circuit for a step-by-step motor, which comprises an inverter, an and-not gate B, an and gate C, and an and gate D. the input terminal of the inverter is connected to the output terminal of directional signal of a signal generating device, one input terminal of the and gate C is connected with the output terminal of the inverter, and the other input terminal of the and gate C is connected to positive direction/or opposite direction stroke protection signal, one input terminal of the and gate B is connected to the output terminal of directional signal, and the other input terminal of the and gate B is connected to the output terminal of opposite direction/or positive direction stroke protection signal, and the output terminals of the and gate C and the and gate D are respectively connected to the input terminal of the and gate D which is connected to the pulse signal output terminal of the signal generating device through a clamp diode. The utility model realizes the stroke-controlled safe protection function of the step-by-step motor.

Description

A kind of step motor control is crossed the stroke safety protective circuit

Technical field

The utility model relates to a kind of stepping motor control circuit, and specifically a kind of step motor control is crossed the stroke safety protective circuit.

Background technology

Stepping motor is driven by controllor for step-by-step motor, controllor for step-by-step motor has pulse signal input terminal and direction signal input, the pulse signal control step rotating speed of motor of pulse signal input terminal input, the direction signal input is imported the direction of the direction signal control step motor operation of high/low level, pulse signal and direction signal are produced by signal generation apparatus, the pulse signal output end output pulse signal of signal generation apparatus, be connected with the pulse signal input terminal of controllor for step-by-step motor, the direction signal output outbound course signal of signal generation apparatus is connected with the direction signal input of controllor for step-by-step motor.When stepping motor moved to travel position, the stroke sense switch of crossing that is arranged on this position was exported the stroke guard signal, made signal generation apparatus change output signal, and the out of service or inverted running of control step motor was realized the stroke safeguard protection.Be associated with signal generation apparatus owing to cross the stroke safety protection function, so reliability is lower.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of higher step motor control of reliability that does not rely on the step motor control signal generation apparatus to cross the stroke safety protective circuit.

A kind of step motor control of the present utility model is crossed the stroke safety protective circuit and is comprised: inverter; NAND gate B; NAND gate C and NAND gate D; the input of inverter links to each other with the direction signal output of signal generation apparatus; the input of NAND gate C links to each other with the output of inverter; another input of NAND gate C and forward/or the reverse stroke guard signal of crossing link to each other; the input of NAND gate B links to each other with the direction signal output; another input of NAND gate B with oppositely/or the output of forward stroke guard signal link to each other; the output of NAND gate C and NAND gate B links to each other with the input of NAND gate D respectively, and the output of NAND gate D links to each other with the pulse signal output end of signal generation apparatus by a clamp diode.

Further, described inverter is in parallel by the input of NAND gate I and constitutes.

Further, the NAND gate I of described NAND gate B, NAND gate C, NAND gate D and formation inverter is four gates in a slice four or two input nand gate chips.

Further, described NAND gate B, NAND gate C and NAND gate D can also be respectively NOR gate E, NOR gate F and NOR gate G.

Further, described inverter is in parallel by the input of NOR gate H and constitutes.

Further, the NOR gate H of described NOR gate E, NOR gate F, NOR gate G and formation inverter is four gates in a slice four or two input NOR gate chips.

Further, described clamp diode can also be clamper triode or inverted triode.

The utility model utilizes a slice four or two input nand gates or a slice four or two input NOR gate completion logic computings; pulse signal by clamp diode control input controllor for step-by-step motor; the realization step motor control is crossed the stroke safety protection function; this circuit does not rely on signal generation apparatus control step motor; circuit is simple; need not debugging, to original step motor control device transparency, reliability height.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment 1.

Fig. 2 is the structural representation of the utility model embodiment 2.

Fig. 3 is the structural representation of the utility model embodiment 3.

Fig. 4 is the structural representation of the utility model embodiment 4.

Fig. 5 is the structural representation of the utility model embodiment 5.

Fig. 6 is the structural representation of the utility model embodiment 6.

Fig. 7 is the structural representation of the utility model embodiment 7.

Fig. 8 is the structural representation of the utility model embodiment 8.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

Embodiment 1

When the input signal of controllor for step-by-step motor is positive mode altogether, the direction signal of direction signal input input is the operation of high level forward, low level inverted running, and to cross the stroke guard signal be low level when effective, and circuit as depicted in figs. 1 and 2.

In Fig. 1; the two input short circuits of a NOR gate H of four or two input NOR gate; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the negative terminal of the output termination clamp diode of NOR gate G; the positive termination of clamp diode is the pulse signal input terminal of sun input controllor for step-by-step motor altogether; the input of the output termination NOR gate G of NOR gate E and NOR gate F; the reverse stroke guard signal of crossing of an input termination of NOR gate E; the direction signal output of another input termination signal generation apparatus of NOR gate E; it also is the direction signal input of controllor for step-by-step motor; the input termination forward of NOR gate F is crossed the stroke guard signal, the output of another input termination inverter of NOR gate F.

In this circuit, indicate NOR gate G and be output as Q, it is X that forward is crossed the stroke guard signal, and reverse stroke guard signal excessively is Y, and direction signal is Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z+Z}+X}+\stackrel{\‾}{Z+Y}},$ After the simplification be $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z}+X}+\stackrel{\‾}{Z+Y}}=(\stackrel{\‾}{Z}+X)\×(Z+Y)=\stackrel{\‾}{Z}\×Y+X\×Z+X\×Y=\stackrel{\‾}{Z}\×Y+Z\×X.$

When stepping motor was not in stroke state; cross the stroke guard signal and be high level; be X=1; Y=1, Q=1 then, NOR gate G is output as high level; clamp diode ends; the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode, and the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and the stepping motor way traffic is all normal.

When forward is crossed the stroke protection; if direction signal is high; be Z=1, X=0, Y=1; Q=0 then; NOR gate G is output as low level, and the positive terminal potential of clamp diode is clamped at low level, makes the pulse signal input terminal of controllor for step-by-step motor can not become high level; the pulse signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor, and stepping motor is because of the operation of pulse-free signal input stopping forward.When forward is crossed the stroke protection; if direction signal is low; be Z=0, X=0, Y=1; Q=1 then; NOR gate G is output as high level, and clamp diode ends, and the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode; the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and stepping motor can inverted running.That is to say that when forward was crossed stroke, circuit stopped stepping motor forward running protection, and does not influence the stepping motor inverted running, stepping motor can be under the control of signal generation apparatus inverted running, withdraw from forward and cross stroke state.

When reverse mistake stroke is protected; if direction signal is low; be Z=0; X=1, Y=0, then Q=0; NOR gate G is output as low level; the positive terminal potential of clamp diode is clamped at low level, makes the pulse signal input terminal of controllor for step-by-step motor can not become high level, and the pulse signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor; stepping motor is because of pulse-free signal input stopping inverted running; when reverse mistake stroke is protected, if direction signal is height, i.e. Z=1; X=1; Y=0, Q=1 then, NOR gate G is output as high level; clamp diode ends; the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode, and the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and stepping motor can the forward operation.That is to say that when crossing stroke, circuit stops the protection of stepping motor inverted running, and does not influence the operation of stepping motor forward when reverse, stepping motor can forward operation under the control of signal generation apparatus, withdraws from and oppositely crosses stroke state.

Embodiment 2

In Fig. 2; the two input short circuits of a NAND gate I of four or two input nand gates; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the negative terminal of the output termination clamp diode of NAND gate D; the positive termination of clamp diode is the pulse signal input terminal of sun input controllor for step-by-step motor altogether; the input of the output termination NAND gate D of NAND gate B and NAND gate C; the input termination forward of NAND gate B is crossed the stroke guard signal; the direction signal output of another input termination signal generation apparatus of NAND gate B; it also is the direction signal input of controllor for step-by-step motor; the reverse stroke guard signal of crossing of an input termination of NAND gate C, the output of another input termination inverter of NAND gate C.

In this circuit, indicate NAND gate G and be output as Q, it is X that forward is crossed the stroke guard signal, and reverse stroke guard signal excessively is Y, and direction signal is Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z\×Z}\×Y}\×\stackrel{\‾}{Z\×X}},$ After the simplification be $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z}\×Y}\×\stackrel{\‾}{Z\×X}}=(\stackrel{\‾}{Z}\×X)+(Z\×Y)=\stackrel{\‾}{Z}\×Y+Z\×X.$

Its logic operation result is identical with the operation result of Fig. 1, and operation principle is also identical with Fig. 1.

Embodiment 3

When the input signal of controllor for step-by-step motor is positive mode altogether, the direction signal of direction signal input input is the operation of low level forward, high level inverted running, and to cross the stroke guard signal be low level when effective, and circuit as shown in Figure 3 and Figure 4.

In Fig. 3; the two input short circuits of a NOR gate H of four or two input NOR gate; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the negative terminal of the output termination clamp diode of NOR gate G; the positive termination of clamp diode is the pulse signal input terminal of sun input controllor for step-by-step motor altogether; the input of the output termination NOR gate G of NOR gate E and NOR gate F; the input termination forward of NOR gate E is crossed the stroke guard signal; the direction signal output of another input termination signal generation apparatus of NOR gate E; it also is the direction signal input of controllor for step-by-step motor; the reverse stroke guard signal of crossing of an input termination of NOR gate F, the output of another input termination inverter of NOR gate F.

In this circuit, indicate NOR gate G and be output as Q, it is X that forward is crossed the stroke guard signal, and reverse stroke guard signal excessively is Y, and direction signal is Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z+Z}+Y}+\stackrel{\‾}{Z+X}},$ After the simplification be $Q=\stackrel{\‾}{Z}\×X+Y\×Z.$

When stepping motor was not in stroke state; cross the stroke guard signal and be high level; be X=1; Y=1, Q=1 then, NOR gate G is output as high level; clamp diode ends; the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode, and the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and the stepping motor way traffic is all normal.

When forward is crossed the stroke protection; if direction signal is low; be X=0, Y=1, Z=0; Q=0 then; NOR gate G is output as low level, and the positive terminal potential of clamp diode is clamped at low level, makes the pulse signal input terminal of controllor for step-by-step motor can not become high level; the pulse signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor, and stepping motor is because of the operation of pulse-free signal input stopping forward.When forward is crossed the stroke protection; if direction signal is high; be X=0, Y=1, Z=1; Q=1 then; NOR gate G is output as high level, and clamp diode ends, and the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode; the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and stepping motor can inverted running.That is to say that when forward was crossed stroke, circuit stopped stepping motor forward running protection, and does not influence the stepping motor inverted running, stepping motor can be under the control of signal generation apparatus inverted running, withdraw from forward and cross stroke state.

When reverse mistake stroke is protected; if direction signal is high; be X=1; Y=0; Z=1; Q=0 then; NOR gate G is output as low level; the positive terminal potential of clamp diode is clamped at low level; make the pulse signal input terminal of controllor for step-by-step motor can not become high level; the pulse signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor; stepping motor is because of pulse-free signal input stopping inverted running; when reverse mistake stroke is protected; if direction signal is low; be X=1, Y=0, Z=0; Q=1 then; NOR gate G is output as high level, and clamp diode ends, and the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode; the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor; stepping motor can forward operation, that is to say, when reverse when crossing stroke; circuit stops the protection of stepping motor inverted running; and do not influence the operation of stepping motor forward, stepping motor can move by forward under the control of signal generation apparatus, withdraws from and oppositely crosses stroke state.

Embodiment 4

In Fig. 4; the two input short circuits of a NAND gate I of four or two input nand gates; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the negative terminal of the output termination clamp diode of NAND gate D; the positive termination of clamp diode is the pulse signal input terminal of sun input controllor for step-by-step motor altogether; the input of the output termination NAND gate D of NAND gate B and NAND gate C; the reverse stroke guard signal of crossing of an input termination of NAND gate B; the direction signal output of another input termination signal generation apparatus of NAND gate B; it also is the direction signal input of controllor for step-by-step motor; the input termination forward of NAND gate C is crossed the stroke guard signal, the output of another input termination inverter of NAND gate C.

In this circuit, indicate NAND gate G and be output as Q, the forward stroke guard signal is X, and the reverse stroke guard signal is Y, and direction signal is Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z\×Z}\×X}\×\stackrel{\‾}{Z\×Y}},$ After the simplification be $Q=\stackrel{\‾}{Z}\×X+Z\×Y.$

Its logic operation result is identical with the operation result of Fig. 3, and operation principle is also identical with Fig. 3.

Embodiment 5

When the input signal of controllor for step-by-step motor is cloudy mode altogether, the direction signal of direction signal input input is the operation of high level forward, low level inverted running, and to cross the stroke guard signal be high level when effective, and circuit as shown in Figure 5 and Figure 6.

In Fig. 5; the two input short circuits of a NOR gate H of four or two input NOR gate; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the anode of the output termination clamp diode of NOR gate G; the negative terminal of clamp diode connects the pulse signal input terminal of common cloudy input controllor for step-by-step motor; the input of the output termination NOR gate G of NOR gate E and NOR gate F; the reverse stroke guard signal of crossing of an input termination of NOR gate E; the direction signal output of another input termination signal generation apparatus of NOR gate E; it also is the direction signal input of controllor for step-by-step motor; the input termination forward of NOR gate F is crossed the stroke guard signal, the output of another input termination inverter of NOR gate F.

In this circuit, indicate NOR gate G and be output as Q, it is X that forward is crossed the stroke guard signal, and reverse stroke guard signal excessively is Y, and direction signal is Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z+Z}+X}+\stackrel{\‾}{Z+Y}},$ After the simplification be $Q=\stackrel{\‾}{Z}\×Y+Z\×X.$

When stepping motor was not in stroke state; cross the stroke guard signal and be low level; be X=0; Y=0, Q=0 then, NOR gate G is output as low level; clamp diode ends; the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode, and the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and the stepping motor way traffic is all normal.

When forward is crossed the stroke protection; if direction signal is high; be X=1, Y=0, Z=1; Q=1 then; NOR gate G is output as high level, and the negative terminal current potential of clamp diode is clamped at high level, makes the pulse signal input terminal of controllor for step-by-step motor can not become low level; the pulse signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor, and stepping motor is because of the operation of pulse-free signal input stopping forward.When forward is crossed the stroke protection; if direction signal is low; be X=1, Y=0, Z=0; Q=0 then; NOR gate G is output as low level, and clamp diode ends, and the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode; the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and stepping motor can inverted running.That is to say that when forward was crossed stroke, circuit stopped stepping motor forward running protection, and does not influence the stepping motor inverted running, stepping motor can be under the control of signal generation apparatus inverted running, withdraw from forward and cross stroke state.

When reverse mistake stroke is protected; if direction signal is low; be X=0, Y=1, Z=0; Q=1 then; NOR gate G is output as high level, and the negative terminal current potential of clamp diode is clamped at high level, makes the pulse signal input terminal of controllor for step-by-step motor can not become low level; the pulse input signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor, and stepping motor stops the forward operation because of the no pulse input.When reverse mistake stroke is protected; if direction signal is high; be X=0; Y=1; Z=1, Q=0 then, NOR gate G is output as low level; clamp diode ends; the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode, and the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and stepping motor can move by forward; that is to say; when crossing stroke, circuit stops the protection of stepping motor inverted running, and does not influence the operation of stepping motor forward when reverse; stepping motor can move by forward under the control of signal generation apparatus, withdraws from and oppositely crosses stroke state.

Embodiment 6

In Fig. 6; the two input short circuits of a NAND gate I of four or two input nand gates; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the anode of the output termination clamp diode of NAND gate D; the negative terminal of clamp diode connects the pulse signal input terminal of common cloudy input controllor for step-by-step motor; the input of the output termination NAND gate D of NAND gate B and NAND gate C; the input termination forward of NAND gate B is crossed the stroke guard signal; the direction signal output of another input termination signal generation apparatus of NAND gate B; it also is the direction signal input of controllor for step-by-step motor; the reverse stroke guard signal of crossing of an input termination of NAND gate C, the output of another input termination inverter of NAND gate C.

In this circuit, indicate NAND gate G and be output as Q, the forward stroke guard signal is input as X, and the reverse stroke guard signal is input as Y, and direction signal is input as Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z\×Z}\×Y}\×\stackrel{\‾}{Z\×X}},$ After the simplification be $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z}\×Y}\×\stackrel{\‾}{Z\×X}}=(\stackrel{\‾}{Z}\×X)+(Z\×Y)=\stackrel{\‾}{Z}\×Y+Z\×X.$

Its logic operation result is identical with the operation result of Fig. 5, and operation principle is also identical with Fig. 5.

Embodiment 7

When the input signal of controllor for step-by-step motor is cloudy mode altogether, the direction signal of direction signal input input is the operation of low level forward, high level inverted running, and to cross the stroke guard signal be high level when effective, and circuit as shown in Figure 7 and Figure 8.

In Fig. 7; the two input short circuits of a NOR gate H of four or two input NOR gate; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the anode of the output termination clamp diode of NOR gate G; the negative terminal of clamp diode connects the pulse signal input terminal of common cloudy input controllor for step-by-step motor; the input of the output termination NOR gate G of NOR gate E and NOR gate F; the input termination forward of NOR gate E is crossed the stroke guard signal; the direction signal output of another input termination signal generation apparatus of NOR gate E; it also is the direction signal input of controllor for step-by-step motor; the reverse stroke guard signal of crossing of an input termination of NOR gate F, the output of another input termination inverter of NOR gate F.

In this circuit, indicate NOR gate G and be output as Q, the forward stroke guard signal is input as X, and the reverse stroke guard signal is input as Y, and direction signal is input as Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z+Z}+Y}+\stackrel{\‾}{Z+X}},$ After the simplification be $Q=\stackrel{\‾}{Z}\×X+Y\×Z.$

When stepping motor was not in stroke state; cross the stroke guard signal and be low level; be X=0; Y=0, Q=0 then, NOR gate G is output as low level; clamp diode ends; the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode, and the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and the stepping motor way traffic is all normal.

When forward is crossed the stroke protection; if direction signal is low; be X=1, Y=0, Z=0; Q=1 then; NOR gate G is output as high level, and the negative terminal current potential of clamp diode is clamped at high level, makes the pulse signal input terminal of controllor for step-by-step motor can not become low level; the pulse input signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor, and stepping motor stops the forward operation because of the no pulse input.When forward is crossed the stroke protection; if direction signal is high; be X=1, Y=0, Z=1; Q=0 then; NOR gate G is output as low level, and clamp diode ends, and the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode; the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and stepping motor can inverted running.That is to say that when forward was crossed stroke, circuit stopped stepping motor forward running protection, and does not influence the stepping motor inverted running, stepping motor can be under the control of signal generation apparatus inverted running, withdraw from forward and cross stroke state.

When reverse mistake stroke is protected; if direction signal is high; be X=0, Y=1, Z=1; Q=1 then; NOR gate G is output as high level, and the negative terminal current potential of clamp diode is clamped at high level, makes the pulse signal input terminal of controllor for step-by-step motor can not become low level; the pulse input signal that signal generation apparatus produces can not normally be imported controllor for step-by-step motor, and stepping motor stops the forward operation because of the no pulse input.When reverse mistake stroke is protected; if direction signal is low; be X=0; Y=1; Z=0, Q=0 then, NOR gate G is output as low level; clamp diode ends; the level of the pulse signal input terminal of controllor for step-by-step motor is not subjected to the influence of clamp diode, and the pulse signal that signal generation apparatus produces can normally be imported controllor for step-by-step motor, and stepping motor can move by forward; that is to say; when crossing stroke, circuit stops the protection of stepping motor inverted running, and does not influence the operation of stepping motor forward when reverse; stepping motor can move by forward under the control of signal generation apparatus, withdraws from and oppositely crosses stroke state.

Embodiment 8

In Fig. 8; the two input short circuits of a NAND gate T of four or two input nand gates; use as an inverter; the direction signal output of the input termination signal generation apparatus of this inverter; it also is the direction signal input of controllor for step-by-step motor; the anode of the output termination clamp diode of NAND gate D; the negative terminal of clamp diode connects the pulse signal input terminal of common cloudy input controllor for step-by-step motor; the input of the output termination NAND gate D of NAND gate B and NAND gate C; the reverse stroke guard signal of crossing of an input termination of NAND gate B; the direction signal output of another input termination signal generation apparatus of NAND gate B; it also is the direction signal input of controllor for step-by-step motor; the input termination forward of NAND gate C is crossed the stroke guard signal, the output of another input termination inverter of NAND gate C.

In this circuit, indicate NAND gate G and be output as Q, the forward stroke guard signal is input as X, and the reverse stroke guard signal is input as Y, and direction signal is input as Z, then $Q=\stackrel{\‾}{\stackrel{\‾}{\stackrel{\‾}{Z\×Z}\×X}\×\stackrel{\‾}{Z\×Y}},$ After the simplification be $Q=\stackrel{\‾}{Z}\×X+Z\×Y.$

Its logic operation result is identical with the operation result of Fig. 7, and operation principle is also identical with Fig. 7.

Above-mentioned 8 kinds of circuit, the employing clamp diode is connected between the pulse signal input terminal of output Q end and controllor for step-by-step motor, can also adopt clamper triode or inverted triode to connect, when adopting the clamper triode, the transistor circuit emitter follower circuit; When adopting inverted triode, the transistor circuit common emitter circuit, the output of the collector electrode of inverted triode is opposite with Q end logic, can solve the opposite polarity problem of input signal of controllor for step-by-step motor.

Claims (7)

1. a step motor control is crossed the stroke safety protective circuit; it is characterized in that; comprise: inverter; NAND gate B; NAND gate C and NAND gate D; the input of inverter links to each other with the direction signal output of signal generation apparatus; the input of NAND gate C links to each other with the output of inverter; another input of NAND gate C and forward/or the reverse stroke guard signal of crossing link to each other; the input of NAND gate B links to each other with the direction signal output; another input of NAND gate B with oppositely/or the output of forward stroke guard signal link to each other; the output of NAND gate C and NAND gate B links to each other with the input of NAND gate D respectively, and the output of NAND gate D links to each other with the pulse signal output end of signal generation apparatus by a clamp diode.

2. protective circuit according to claim 1 is characterized in that, described inverter is in parallel by the input of NAND gate I and constitutes.

3. protective circuit according to claim 2 is characterized in that, the NAND gate I of described NAND gate B, NAND gate C, NAND gate D and formation inverter is four gates in a slice four or two input nand gate chips.

4. protective circuit according to claim 1 is characterized in that, described NAND gate B, NAND gate C and NAND gate D can also be respectively NOR gate E, NOR gate F and NOR gate G.

5. protective circuit according to claim 4 is characterized in that, described inverter is in parallel by the input of NOR gate H and constitutes.

6. protective circuit according to claim 5 is characterized in that being, the NOR gate H of described NOR gate E, NOR gate F, NOR gate G and formation inverter is four gates in a slice four or two input NOR gate chips.

7. according to the arbitrary described protective circuit of claim 1 to 6, it is characterized in that being that described clamp diode can also be clamper triode or inverted triode.

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