Passive rotating speed detection circuit

Abstract

The utility model discloses a passive rotating speed detection circuit, relates to the technical field of intelligent detection and control, and aims to solve the problems that the rotating speed of an existing motor cannot be effectively detected and the practicability is insufficient under certain specific conditions without a power supply. According to the technical scheme, the device is characterized in that the device comprises a rotating speed motor coil signal unit, a power supply unit, a pulse acquisition unit, a single-chip microcomputer signal processing unit and a digital display unit, the rotating speed motor coil signal unit and a rotating speed motor rotate along with a tested motor, and two sets of voltage signals are generated in a leading-out coil through rotation of the rotating speed motor; one group provides power, and the other group provides pulse signals; the single-chip microcomputer signal processing unit processes the collected pulse signals into frequency signals and outputs the frequency signals to the nixie tube for display. The digital display unit displays the detected speed value through the signal output by the single-chip microcomputer. And the efficient working effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of intelligent detection and control technology, and in particular to a passive speed detection circuit. Background Technology

[0002] Speed ​​detection refers to the measurement of the rotational speed of rotating objects such as motors and wheels. The motor speed is tested and displayed on a digital display. Traditional methods involve an external power conversion module to obtain 15V or other low-voltage DC power for signal acquisition, processing, and display circuits. However, in certain situations where it is necessary to detect and display the motor speed, a power supply may be unavailable or difficult to connect. Therefore, passive motor speed detection is required. Passive circuits lack an internal energy source and rely on external power (such as a signal generator or voltage source) to operate.

[0003] The existing technical solutions mentioned above have the following drawbacks: the existing motor speed cannot be effectively detected in certain situations where there is no power supply, and its practicality is insufficient. Utility Model Content

[0004] The purpose of this invention is to provide a passive speed detection circuit.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A passive speed detection circuit includes a speed motor coil signal unit, a power supply unit, a pulse acquisition unit, a microcontroller signal processing unit, and a digital display unit. The speed motor coil signal unit generates two sets of voltage signals in the lead-out coil through the rotation of the speed motor, one set providing power and the other set providing pulse signals.

[0007] The power supply unit processes the signal of a set of coils into a DC regulated power supply signal.

[0008] The pulse acquisition unit processes the signal from a set of coils into a pulse signal that can be processed by a microcontroller.

[0009] The microcontroller signal processing unit processes the collected pulse signal into a frequency signal and outputs it to the digital tube for display.

[0010] The digital display unit displays the detected speed value through the signal output by the microcontroller.

[0011] By adopting the above technical solution, the tachometer motor outputs two sets of coils: one set provides power to the detection circuit, and the other set provides the speed detection signal. The power supply is rectified and filtered to obtain a stable DC circuit power supply; the speed input signal is optically isolated, processed by a microcontroller, and displayed on a digital tube. This enables speed detection of the motor under test without an external power supply.

[0012] Furthermore, the power supply unit includes: a rectifier bridge D3, a bidirectional transient diode D7, capacitors C1, C2, C3, and C4, and a Zener diode U1;

[0013] Pin 2 of the rectifier bridge D3 is grounded. Pin 1 of the rectifier bridge D3, one end of the bidirectional transient diode D7, one end of capacitor C1, one end of capacitor C2, and pin 3 of the Zener diode U1 are electrically connected. The other end of the bidirectional transient diode D7 is grounded. The other end of capacitor C1 is grounded. The other end of capacitor C2 is grounded. Pin 1 of the Zener diode U1 is grounded. Pin 2 of the Zener diode U1, one end of capacitor C3, and one end of capacitor C4 are electrically connected. The other end of capacitor C3 is grounded. The other end of capacitor C4 is grounded.

[0014] By adopting the above technical solution, D3 is a rectifier bridge that rectifies AC or pulse signals into unidirectional DC signals; D7 is a bidirectional transient diode for voltage overload protection; C1 and C2 are capacitors that filter high-frequency and low-frequency signals in the circuit; U1 is a Zener diode that converts the input voltage into a stable power supply voltage, such as 3.3V; and C3 and C4 are capacitors that filter high-frequency and low-frequency signals in the circuit.

[0015] Furthermore, the pulse acquisition unit includes: a polarized diode D5, a current-limiting voltage divider resistor R18, a bleeder diode D6, an optocoupler U3, a current-limiting voltage divider resistor R20, an anti-interference capacitor C11, and a microcontroller input port input resistor R14.

[0016] Pin 1 of the optocoupler U3, one end of the bleeder diode D6, and one end of the current-limiting voltage divider resistor R18 are electrically connected. The other end of the current-limiting voltage divider resistor R18 is electrically connected to one end of the polarized diode D5. Pin 2 of the optocoupler U3 is electrically connected to the other end of the bleeder diode D6. Pin 3 of the optocoupler U3, one end of the current-limiting voltage divider resistor R20, one end of the anti-interference capacitor C11, and one end of the input resistor R14 of the microcontroller input port are electrically connected. The other end of the anti-interference capacitor C11 is grounded. Pin 4 of the optocoupler U3 is grounded.

[0017] By adopting the above technical solution, D5 is a polarized diode, which enables unidirectional conduction of the input signal; D6 is a bleeder diode, which prevents reverse voltage interference at the input terminal of the optocoupler from causing damage; U3 is an optocoupler, which isolates electrical signals, protects the input terminal of the microcontroller, and prevents high voltage of the input signal from damaging the microcontroller; C11 is an anti-interference capacitor, which prevents sudden interference from abrupt changes in the microcontroller's input signal.

[0018] Furthermore, the microcontroller signal processing unit includes: crystal oscillator Y1, crystal oscillator load capacitor C7, crystal oscillator load capacitor C8, microcontroller U2, filter capacitor C9, and filter capacitor C10;

[0019] Pin 4 of the microcontroller U2, one end of the crystal oscillator Y1, and one end of the crystal oscillator load capacitor C7 are electrically connected. Pin 5 of the microcontroller U2, the other end of the crystal oscillator Y1, and one end of the crystal oscillator load capacitor C8 are electrically connected. The other ends of the crystal oscillator load capacitor C7 and the other ends of the crystal oscillator load capacitor C8 are grounded. Pin 10 of the microcontroller U2 is grounded. Pin 20 of the microcontroller U2, one end of the filter capacitor C9, and one end of the filter capacitor C10 are electrically connected. The other end of the filter capacitor C9 and the other end of the filter capacitor C10 are grounded.

[0020] By adopting the above technical solution, Y1 is a crystal oscillator that provides a stable oscillation frequency for the microcontroller; U2 is the microcontroller that is responsible for signal acquisition, analysis and processing; C9 and C10 are filter capacitors that filter the high-frequency and low-frequency signals of the power supply.

[0021] Furthermore, the digital display unit includes: a digital tube control signal input resistor R6, a digital tube control signal input resistor R7, a digital tube control signal input resistor R8, a digital tube control signal input resistor R9, a digital tube control signal input resistor R10, a digital tube control signal input resistor R11, a digital tube control signal input resistor R12, a digital tube control signal input resistor R13, a four-digit digital tube ULED1, a digital tube working driver transistor Q1, a digital tube working driver transistor Q2, a digital tube working driver transistor Q3, a digital tube working driver transistor Q4, a transistor base driving resistor R1, a transistor base driving resistor R2, a transistor base driving resistor R3, and a transistor base driving resistor R4;

[0022] Pin 11 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R6; pin 7 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R8; pin 4 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R13; pin 2 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R10; pin 1 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R9; pin 10 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R7; pin 5 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R12; and pin 3 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R11. The four-digit LED display ULED1 has the following electrical connections: pin 12 is electrically connected to pin 1 of the LED display driver transistor Q1; pin 3 of the LED display driver transistor Q1 is electrically connected to one end of the transistor base drive resistor R1; pin 9 of the four-digit LED display ULED1 is electrically connected to pin 1 of the LED display driver transistor Q2; pin 3 of the LED display driver transistor Q2 is electrically connected to one end of the transistor base drive resistor R2; pin 8 of the four-digit LED display ULED1 is electrically connected to pin 1 of the LED display driver transistor Q3; pin 3 of the LED display driver transistor Q3 is electrically connected to one end of the transistor base drive resistor R3; pin 6 of the four-digit LED display ULED1 is electrically connected to pin 1 of the LED display driver transistor Q4; and pin 3 of the LED display driver transistor Q4 is electrically connected to one end of the transistor base drive resistor R4.

[0023] By adopting the above technical solution, ULED1 is a four-digit LED display used to display the speed value; Q1 to Q4 are LED display driving transistors used for power driving of the LED display.

[0024] In summary, the beneficial technical effects of this utility model are as follows:

[0025] 1. By using a microcontroller, the pulse signal is converted into a speed value display on a digital tube. The microcontroller processes the rotation speed signal, simplifies the traditional signal processing circuit, and controls the digital tube to display the speed value.

[0026] 2. By processing the output voltage of the speed test motor coil, the power supply for the signal processing circuit is realized, converting the voltage output of the speed test motor coil into a stable power supply for the signal processing circuit. Attached Figure Description

[0027] Figure 1 This is a functional diagram of the present utility model;

[0028] Figure 2This is the power conversion circuit diagram of this utility model;

[0029] Figure 3 This is a circuit diagram of the pulse signal input circuit of this utility model;

[0030] Figure 4 This is the circuit diagram of the microcontroller processing circuit of this utility model;

[0031] Figure 5 This is the circuit diagram for the digital tube display of this utility model. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Reference Figure 1-5 A passive speed detection circuit includes a motor coil signal unit, a power supply unit, a pulse acquisition unit, a microcontroller signal processing unit, and a digital display unit. The motor coil signal unit generates two sets of voltage signals in the lead-out coil, one for power supply and the other for pulse signals, as the motor rotates following the motor under test. The power supply unit processes the coil signal into a DC regulated power supply signal. The pulse acquisition unit processes the coil signal into a pulse signal that can be processed by the microcontroller. The microcontroller signal processing unit processes the acquired pulse signal into a frequency signal and outputs it to the digital display unit. The digital display unit displays the detected speed value based on the signal output from the microcontroller.

[0034] The power supply unit includes: rectifier bridge D3, bidirectional transient diode D7, capacitors C1, C2, C3, C4, and Zener diode U1; pin 2 of rectifier bridge D3 is grounded, pin 1 of rectifier bridge D3, one end of bidirectional transient diode D7, one end of capacitor C1, one end of capacitor C2, and pin 3 of Zener diode U1 are electrically connected, the other end of bidirectional transient diode D7 is grounded, the other end of capacitor C1 is grounded, the other end of capacitor C2 is grounded, pin 1 of Zener diode U1 is grounded, pin 2 of Zener diode U1, one end of capacitor C3, and one end of capacitor C4 are electrically connected, the other end of capacitor C3 is grounded, and the other end of capacitor C4 is grounded.

[0035] The pulse acquisition unit includes: a polarized diode D5, a current-limiting voltage divider resistor R18, a bleeder diode D6, an optocoupler U3, a current-limiting voltage divider resistor R20, an anti-interference capacitor C11, and a microcontroller input port resistor R14. Pin 1 of the optocoupler U3, one end of the bleeder diode D6, and one end of the current-limiting voltage divider resistor R18 are electrically connected; the other end of the current-limiting voltage divider resistor R18 is electrically connected to one end of the polarized diode D5; pin 2 of the optocoupler U3 and the other end of the bleeder diode D6 are electrically connected; pin 3 of the optocoupler U3, one end of the current-limiting voltage divider resistor R20, one end of the anti-interference capacitor C11, and one end of the microcontroller input port resistor R14 are electrically connected; the other end of the anti-interference capacitor C11 is grounded; and pin 4 of the optocoupler U3 is grounded.

[0036] like Figure 1-5 As shown, the microcontroller signal processing unit includes: crystal oscillator Y1, crystal load capacitor C7, crystal load capacitor C8, microcontroller U2, filter capacitor C9, and filter capacitor C10; pin 4 of microcontroller U2, one end of crystal oscillator Y1, and one end of crystal load capacitor C7 are electrically connected; pin 5 of microcontroller U2, the other end of crystal oscillator Y1, and one end of crystal load capacitor C8 are electrically connected; the other ends of crystal load capacitor C7 and crystal load capacitor C8 are grounded; pin 10 of microcontroller U2 is grounded; pin 20 of microcontroller U2, one end of filter capacitor C9, and one end of filter capacitor C10 are electrically connected; the other end of filter capacitor C9 and the other end of filter capacitor C10 are grounded.

[0037] The digital display unit includes: LED control signal input resistors R6, R7, R8, R9, R10, R11, R12, and R13; a four-digit LED display ULED1; LED driving transistors Q1, Q2, Q3, and Q4; and a transistor base driver. Resistors R1, R2, R3, and R4 are connected to the transistor base drive resistors. Pin 11 of the four-digit LED1 is electrically connected to one end of the LED1 control signal input resistor R6; pin 7 of the four-digit LED1 is electrically connected to one end of the LED1 control signal input resistor R8; pin 4 of the four-digit LED1 is electrically connected to one end of the LED1 control signal input resistor R13; pin 2 of the four-digit LED1 is electrically connected to one end of the LED1 control signal input resistor R10; and pin 1 of the four-digit LED1 is electrically connected to the... One end of the control signal input resistor R9 is electrically connected; pin 10 of the four-digit LED1 is electrically connected to one end of the control signal input resistor R7; pin 5 of the four-digit LED1 is electrically connected to one end of the control signal input resistor R12; pin 3 of the four-digit LED1 is electrically connected to one end of the control signal input resistor R11; pin 12 of the four-digit LED1 is electrically connected to pin 1 of the driver transistor Q1; pin 3 of the driver transistor Q1 is electrically connected to one end of the base drive resistor R1. Pin 9 of ULED1 is electrically connected to pin 1 of the digital tube driver transistor Q2. Pin 3 of the digital tube driver transistor Q2 is electrically connected to one end of the transistor base drive resistor R2. Pin 8 of the four-digit digital tube ULED1 is electrically connected to pin 1 of the digital tube driver transistor Q3. Pin 3 of the digital tube driver transistor Q3 is electrically connected to one end of the transistor base drive resistor R3. Pin 6 of the four-digit digital tube ULED1 is electrically connected to pin 1 of the digital tube driver transistor Q4. Pin 3 of the digital tube driver transistor Q4 is electrically connected to one end of the transistor base drive resistor R4.

[0038] The implementation principle of this embodiment is as follows: Tachometer coil signal: The tachometer motor rotates following the motor under test. Through the rotation of the tachometer motor, two sets of voltage signals are generated in the lead-out coils: one set provides power, and the other provides a pulse signal. Power supply: The signal from one set of coils is processed into a DC regulated power supply signal. Pulse acquisition: The signal from one set of coils is processed into a pulse signal that can be processed by the microcontroller. Microcontroller signal processing: The acquired pulse signal is processed into a frequency signal and output to a digital tube display. Digital display: The detected speed value is displayed through the signal output by the microcontroller. The tachometer motor outputs two sets of coils: one set provides power to the detection circuit, and the other set provides the speed detection signal. The power supply is rectified and filtered to obtain a stable DC circuit power supply. The speed input signal is optically isolated, connected to the microcontroller for processing, and displayed through a digital tube, thus realizing speed detection of the motor under test without an external power supply.

[0039] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A passive speed detection circuit, comprising a speed motor coil signal unit, a power supply unit, a pulse acquisition unit, a microcontroller signal processing unit, and a digital display unit, characterized in that: The rotating motor coil signal unit is used because the rotating motor follows the rotation of the motor under test. Through the rotation of the rotating motor, two sets of voltage signals are generated in the lead coil, one set provides power and the other set provides pulse signals. The power supply unit processes the signal of a set of coils into a DC regulated power supply signal. The pulse acquisition unit processes the signal from a set of coils into a pulse signal that can be processed by a microcontroller. The microcontroller signal processing unit processes the collected pulse signal into a frequency signal and outputs it to the digital tube for display. The digital display unit displays the detected speed value through the signal output by the microcontroller.

2. The passive speed detection circuit according to claim 1, characterized in that: The power supply unit includes: a rectifier bridge D3, a bidirectional transient diode D7, capacitors C1, C2, C3, and C4, and a Zener diode U1; Pin 2 of the rectifier bridge D3 is grounded. Pin 1 of the rectifier bridge D3, one end of the bidirectional transient diode D7, one end of capacitor C1, one end of capacitor C2, and pin 3 of the Zener diode U1 are electrically connected. The other end of the bidirectional transient diode D7 is grounded. The other end of capacitor C1 is grounded. The other end of capacitor C2 is grounded. Pin 1 of the Zener diode U1 is grounded. Pin 2 of the Zener diode U1, one end of capacitor C3, and one end of capacitor C4 are electrically connected. The other end of capacitor C3 is grounded. The other end of capacitor C4 is grounded.

3. The passive speed detection circuit according to claim 1, characterized in that: The pulse acquisition unit includes: a polarized diode D5, a current-limiting voltage divider resistor R18, a bleeder diode D6, an optocoupler U3, a current-limiting voltage divider resistor R20, an anti-interference capacitor C11, and an input resistor R14 for the microcontroller input port. Pin 1 of the optocoupler U3, one end of the bleeder diode D6, and one end of the current-limiting voltage divider resistor R18 are electrically connected. The other end of the current-limiting voltage divider resistor R18 is electrically connected to one end of the polarized diode D5. Pin 2 of the optocoupler U3 is electrically connected to the other end of the bleeder diode D6. Pin 3 of the optocoupler U3, one end of the current-limiting voltage divider resistor R20, one end of the anti-interference capacitor C11, and one end of the input resistor R14 of the microcontroller input port are electrically connected. The other end of the anti-interference capacitor C11 is grounded. Pin 4 of the optocoupler U3 is grounded.

4. The passive speed detection circuit according to claim 1, characterized in that: The microcontroller signal processing unit includes: crystal oscillator Y1, crystal oscillator load capacitor C7, crystal oscillator load capacitor C8, microcontroller U2, filter capacitor C9, and filter capacitor C10. Pin 4 of the microcontroller U2, one end of the crystal oscillator Y1, and one end of the crystal oscillator load capacitor C7 are electrically connected. Pin 5 of the microcontroller U2, the other end of the crystal oscillator Y1, and one end of the crystal oscillator load capacitor C8 are electrically connected. The other ends of the crystal oscillator load capacitor C7 and the other ends of the crystal oscillator load capacitor C8 are grounded. Pin 10 of the microcontroller U2 is grounded. Pin 20 of the microcontroller U2, one end of the filter capacitor C9, and one end of the filter capacitor C10 are electrically connected. The other end of the filter capacitor C9 and the other end of the filter capacitor C10 are grounded.

5. The passive speed detection circuit according to claim 1, characterized in that: The digital display unit includes: a digital tube control signal input resistor R6, a digital tube control signal input resistor R7, a digital tube control signal input resistor R8, a digital tube control signal input resistor R9, a digital tube control signal input resistor R10, a digital tube control signal input resistor R11, a digital tube control signal input resistor R12, a digital tube control signal input resistor R13, a four-digit digital tube ULED1, a digital tube working driver transistor Q1, a digital tube working driver transistor Q2, a digital tube working driver transistor Q3, a digital tube working driver transistor Q4, a transistor base driving resistor R1, a transistor base driving resistor R2, a transistor base driving resistor R3, and a transistor base driving resistor R4; Pin 11 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R6; pin 7 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R8; pin 4 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R13; pin 2 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R10; pin 1 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R9; pin 10 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R7; pin 5 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R12; and pin 3 of the four-digit LED display ULED1 is electrically connected to one end of the LED display control signal input resistor R11. The four-digit LED display ULED1 has the following electrical connections: pin 12 is electrically connected to pin 1 of the LED display driver transistor Q1; pin 3 of the LED display driver transistor Q1 is electrically connected to one end of the transistor base drive resistor R1; pin 9 of the four-digit LED display ULED1 is electrically connected to pin 1 of the LED display driver transistor Q2; pin 3 of the LED display driver transistor Q2 is electrically connected to one end of the transistor base drive resistor R2; pin 8 of the four-digit LED display ULED1 is electrically connected to pin 1 of the LED display driver transistor Q3; pin 3 of the LED display driver transistor Q3 is electrically connected to one end of the transistor base drive resistor R3; pin 6 of the four-digit LED display ULED1 is electrically connected to pin 1 of the LED display driver transistor Q4; and pin 3 of the LED display driver transistor Q4 is electrically connected to one end of the transistor base drive resistor R4.

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