Rotating speed sampling circuit with state detection function

Abstract

The utility model provides a rotating speed sampling circuit with state detection, the rotating speed sampling circuit is connected with a motor rotating speed output port, and the rotating speed sampling circuit comprises a rotating speed signal processing circuit which comprises a transient suppression diode, an amplitude limiting diode and a signal conversion circuit, one end of the signal conversion circuit is connected with a motor rotating speed output port through a current-limiting resistor and a first voltage division circuit; the end, connected with the motor rotating speed output port, of the current limiting resistor is further grounded through the transient suppression diode, the end, connected with the signal conversion circuit, of the current limiting resistor is further grounded through the amplitude limiting diode, and the other end of the signal conversion circuit is connected with a controller. And the rotating speed signal state acquisition circuit comprises a backward diode and a second voltage division circuit, the cathode of the backward diode is connected with the motor rotating speed output port, and the anode of the backward diode is connected with the controller through the second voltage division circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rotational speed sampling circuit, specifically, relates to a rotational speed sampling circuit with state detection. BACKGROUND

[0002] With the rapid development of motor and related equipment, various kinds of industrial and related supporting equipment emerge as the times require, and motor speed is an important index of equipment operation, is related to the instantaneous state of equipment, can embody whether the related equipment is in normal operation, and this data is very important to motor and whole control system, is related to whether the system is normal and stable or not. Therefore, accurately and timely detecting motor speed is an important link of industrial control.

[0003] The existing motor speed detection unit can only collect the rotational speed signal, and cannot judge the detection error in time in case of accident or failure, and mistakenly thinks that the motor is faulty. Therefore, how to detect the motor speed in a complex environment to ensure the normal operation of the motor and provide strong support for the stable operation of the whole system has become a problem to be solved.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. SUMMARY

[0005] The utility model discloses a kind of rotational speed sampling circuits with state detection, to solve the problems of prior art, and provide a rotational speed sampling circuit with state detection.

[0006] To achieve the above object, the technical scheme adopted by the utility model is: a rotational speed sampling circuit with state detection, the rotational speed sampling circuit is connected with motor speed output port, and the rotational speed sampling circuit includes:

[0007] Rotational speed signal processing circuit, including transient suppression diode, limiting diode and signal conversion circuit, one end of the signal conversion circuit is connected with motor speed output port through current-limiting resistor and first voltage dividing circuit;The end of the current-limiting resistor connected with motor speed output port is also grounded through the transient suppression diode, and the end of the current-limiting resistor connected with the signal conversion circuit is also grounded through the limiting diode, and the other end of the signal conversion circuit is connected with controller;

[0008] Rotational speed signal state acquisition circuit, including reverse diode and second voltage dividing circuit, the cathode of the reverse diode is connected with motor speed output port, and the anode of the reverse diode is connected with controller through the second voltage dividing circuit.

[0009] Further, the signal conversion circuit includes a switch tube, the control end of the switch tube is connected with the limiting diode, and the output end of the switch tube is connected with the controller through the capacitor filter circuit.

[0010] The utility model discloses relative prior art has substantial characteristics and progress, specifically speaking, the utility model discloses in the collection rotational speed signal, still through reverse diode and second voltage dividing circuit to rotational speed state are collected to supply the detection error that MCU subsequent according to rotational speed state removes unexpected or breakdown causes, when collection rotational speed signal, through signal conversion circuit converts rotational speed signal into the signal that can be recognized controller, convenient reading. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the principle diagram of the utility model.

[0012] Figure 2 It is the circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] The technical scheme of the utility model is described in further detail below through specific embodiments.

[0014] Embodiment 1

[0015] The embodiment provides a rotational speed sampling circuit with state detection, the rotational speed sampling circuit is connected with motor rotational speed output port, and includes rotational speed signal processing circuit and rotational speed signal state acquisition circuit.

[0016] Rotational speed signal processing circuit, including transient suppression diode, limiting amplitude diode and signal conversion circuit, one end of signal conversion circuit is connected motor rotational speed output port through current-limiting resistor and first voltage dividing circuit;The one end of current-limit of motor rotational speed output port is still connected ground through the transient suppression diode, and the one end of current-limiting resistor and signal conversion circuit is still connected ground through limiting amplitude diode, and the other end of signal conversion circuit is connected controller.

[0017] In specific implementation, the transient suppression diode is D2, when rotational speed signal MP1_IN passes through D2, D2 can remove the strong interference signal such as inrush current superimposed on the signal.The limiting amplitude diode is D3, and is used to limit rotational speed signal in the positive signal amplitude range that can be detected.

[0018] In specific implementation, the signal conversion circuit includes switch tube, the control end of switch tube is connected limiting amplitude diode, and the output end of switch tube is connected controller through capacitor filter circuit. Figure 2 As shown in the specifically, Q1 is switch tube, and is used to convert the sine wave signal output by motor rotational speed output port into rectangular wave signal to be recognized by single-chip microcomputer.

[0019] It can be understood that the output end of the switch tube Q1 is also connected to the 5V power supply through the current limiting resistor R4. The output end of the switch tube Q1 is also connected to the ground through the filter capacitor C2; C2 is a filter capacitor for the MCU port, which is used to filter out noise signals and obtain a relatively pure speed signal to input to the MP_In_MCU port of the MCU.

[0020] The current limiting resistor includes a first current limiting resistor and a second current limiting resistor, and the first current limiting resistor and the second current limiting resistor are further connected to the ground through a first filter capacitor C3. Specifically, as shown in the figure, the first current limiting resistor is a resistor R5, the second current limiting resistor is a resistor R6, and the first filter capacitor is C3. It should be noted that this capacitor can be adjusted within a certain range according to actual conditions, but if the capacitor exceeds 10nF, it will have a certain negative impact on the speed sampling frequency and voltage amplitude. Figure 2

[0021] The first voltage dividing circuit includes a voltage dividing resistor R7, one end of the voltage dividing resistor R7 is connected to the connection point of the current limiting resistor and the limiting diode D3, and the other end is grounded. R7 is a voltage dividing resistor for the front stage voltage, which divides the voltage sampled by the front stage and provides a suitable voltage range for the rear stage.

[0022] The speed signal state acquisition circuit includes a reverse diode and a second voltage dividing circuit, the cathode of the reverse diode is connected to the motor speed output port, and the anode of the reverse diode is connected to the controller through the second voltage dividing circuit to discharge the detection error caused by unexpected or failure during normal operation of the motor.

[0023] Specifically, as shown in the figure, the motor speed output port is connected to the MP_As_In_MCU port of the controller through the reverse diode D1 and the second voltage dividing circuit. Here, the reverse diode D1 serves as an anti-reverse device for the external port of the circuit, preventing interference from external surges and other disturbances to the circuit devices or system. Figure 2

[0024] In specific implementation, the second voltage dividing circuit includes a first resistor R1, a second resistor R2 and a third resistor R3, the 5V power supply is connected to the ground through the first resistor R1, the second resistor R2 and the third resistor R3, the connection point of the first resistor R1 and the second resistor R2 is connected to the anode of the reverse diode D1, the connection point between the second resistor R2 and the third resistor R3 is connected to the controller, and the third resistor R3 has a second filter capacitor C1 connected in parallel across its terminals. C1 is a filter capacitor for the MCU port, which is used to filter out noise signals and obtain a relatively pure speed signal to input to the MCU port.

[0025] Specifically, the working principle of the embodiment is as follows:

[0026] ​​When the rotating speed signal MP1_IN passes through D2, the surge and other strong interference signals superimposed on the signal are removed, and then pass through the current limiting resistor combination R5 and R6 and the filter capacitor C3, and are then divided by the voltage dividing resistor R7, at this time, the sine wave signal still has positive and negative, and then passes through D3 to limit the signal to a detectable positive signal amplitude range, the signal is converted into a rectangular wave signal by the transistor Q1, and then passes through C2 to filter out the noise signal to obtain a relatively pure rotating speed signal, which can be recognized by the single-chip microcomputer, and the single-chip microcomputer can analyze the rotating speed signal by reading and processing.

[0027] When the rotating speed input MP1_IN is low, MP_In_MCU is high, and MP_AS_In_MCU is low, and when MP1_IN is high, MP_In_MCU is low, and MP_AS_In_MCU is high, the state information and rotating speed data of the rotating speed can be accurately determined.

[0028] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. A rotational speed sampling circuit with band state detection, the rotational speed sampling circuit is connected with a motor rotational speed output port, characterized in that, The rotation speed sampling circuit comprises: The rotation speed signal processing circuit comprises a transient suppression diode, a limiting diode and a signal conversion circuit, one end of the signal conversion circuit is connected to the motor rotation speed output port through a current-limiting resistor and a first voltage dividing circuit; the end of the current-limiting resistor connected to the motor rotation speed output port is also connected to the ground through the transient suppression diode, the end of the current-limiting resistor connected to the signal conversion circuit is also connected to the ground through the limiting diode, and the other end of the signal conversion circuit is connected to the controller; The rotation speed signal state acquisition circuit comprises a reverse diode and a second voltage dividing circuit, the cathode of the reverse diode is connected to the motor rotation speed output port, and the anode of the reverse diode is connected to the controller through the second voltage dividing circuit.

2. The rotational speed sampling circuit with state detection according to claim 1, characterized in that The signal conversion circuit comprises a switch tube, the control end of the switch tube is connected to the limiting diode, and the output end of the switch tube is connected to the controller through a capacitor filter circuit.

3. The rotational speed sampling circuit with state detection according to claim 1 or 2, characterized in that The current-limiting resistor comprises a first current-limiting resistor and a second current-limiting resistor, and the first current-limiting resistor and the second current-limiting resistor are also connected to the ground through a first filter capacitor.

4. The rotational speed sampling circuit with state detection according to claim 1 or 2, characterized in that The first voltage dividing circuit comprises a voltage dividing resistor, one end of the voltage dividing resistor is connected to the connection point of the current-limiting resistor and the limiting diode, and the other end is connected to the ground.

5. The rotational speed sampling circuit with state detection according to claim 1 or 2, characterized in that: The second voltage dividing circuit comprises a first resistor, a second resistor and a third resistor, a 5V power supply is connected to the ground through the first resistor, the second resistor and the third resistor, the connection point of the first resistor and the second resistor is connected to the positive electrode of the reverse diode, the connection point between the second resistor and the third resistor is connected to the controller, and the third resistor is also connected in parallel with a second filter capacitor.

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