Narrow pulse generating circuit

Abstract

The utility model discloses a narrow pulse generating circuit, and particularly relates to the technical field of narrow pulse waveform generating circuits, which comprises a microcontroller, a waveform processing unit and an AND gate operation unit. The microcontroller is electrically connected with the waveform processing unit and the AND gate operation unit. The waveform processing unit is electrically connected with the AND gate operation unit. The microcontroller is used for outputting an initial square wave signal to the waveform processing unit and the AND gate operation unit; the waveform processing unit is used for outputting a corresponding waveform processing signal to the AND gate operation unit after performing waveform processing on the initial square wave signal; the AND gate operation unit is used for performing AND operation according to the initial square wave signal and the waveform processing signal to obtain a narrow pulse signal; parameters of the waveform processing unit correspond to the pulse width of the narrow pulse generating circuit. According to the utility model, the waveform processing signal output by the waveform processing unit and the initial square wave signal output by the microcontroller are subjected to AND operation through the AND gate operation unit, so that a pulse signal can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of narrow pulse waveform generating circuits, and more specifically, to a narrow pulse generating circuit. Background Art

[0002] It is known that in TOF laser ranging based on the pulse method, it is often necessary to generate a narrow pulse signal with a relatively high frequency; and at present, it is more common to use MCU or FPGA to generate narrow pulse signals; if the narrow pulse signal generated by a conventional MCU is used, its pulse width is difficult to meet the laser driving requirements; if the narrow pulse signal generated by FPGA is used, it will cause the system to be too complicated and expensive; in response to this situation, Chinese patent application number: 201920468061.9 discloses a narrow pulse generating circuit and a laser driving device, the narrow pulse generating circuit of which uses the initial square wave signal generated by the microcontroller to perform an XOR operation with the delay signal corresponding to the initial square wave signal, and then obtains a narrow pulse signal, which greatly reduces the working requirements of the microcontroller, works stably and reliably, and has low cost.

[0003] However, in actual use, the narrow pulse signal obtained by performing an XOR operation on the initial square wave signal generated by the microcontroller and the delayed signal corresponding to the initial square wave signal is not convenient for adjusting the pulse width. Therefore, a narrow pulse generating circuit is proposed as a further improvement to make the pulse width adjustment of the circuit more convenient. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a narrow pulse generating circuit to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a narrow pulse generating circuit, the narrow pulse generating circuit comprising: a microcontroller, a waveform processing unit and an AND gate operation unit;

[0006] The microcontroller is electrically connected to the waveform processing unit and the AND gate operation unit respectively, and the waveform processing unit is electrically connected to the AND gate operation unit;

[0007] The microcontroller is used to output an initial square wave signal to the waveform processing unit and the AND gate operation unit;

[0008] The waveform processing unit is used to perform waveform processing on the initial square wave signal and output a corresponding waveform processing signal to the AND gate operation unit;

[0009] The AND gate operation unit is used to perform an AND operation on the initial square wave signal and the waveform processing signal to obtain a narrow pulse signal;

[0010] The parameters of the waveform processing unit correspond to the pulse width of the narrow pulse generating circuit.

[0011] Furthermore, the waveform processing unit includes: a resistor R and a capacitor C;

[0012] The signal output end of the microcontroller is electrically connected to one end of the resistor R and the first input end of the AND gate operation unit respectively, the other end of the resistor R is electrically connected to one end of the capacitor C and the second input end of the AND gate operation unit respectively, and the other end of the capacitor C and the GND end of the AND gate operation unit are both grounded.

[0013] Furthermore, one end of the resistor R connected to the signal output end of the microcontroller is set as the input end of the waveform processing unit, and one end of the resistor R connected to the capacitor C is set as the output end of the waveform processing unit.

[0014] Furthermore, the resistance of the resistor R and the capacitance of the capacitor C correspond to the pulse width of the narrow pulse generating circuit.

[0015] Furthermore, the initial square wave signal is a conventional square wave signal.

[0016] Furthermore, the chip of the AND gate operation unit is set to be a SN74LVC1 G00DBVR chip.

[0017] The technical effects and advantages of this utility model are:

[0018] Compared with the existing technology, by setting an AND gate operation unit, the waveform processing signal output by the waveform processing unit and the initial square wave signal output by the microcontroller are ANDed together to obtain a pulse signal; and by changing the parameters in the waveform processing unit, the pulse width can be adjusted; the circuit can generate a narrow pulse signal with a simpler circuit design and lower cost, and therefore, compared with the existing circuit, greatly reduces the performance requirements for the microcontroller, is low in cost, and is stable and reliable; the pulse width can be adjusted by adjusting the capacitor C, making the pulse width adjustment of the circuit more convenient; the initial square wave signal output by the microcontroller is a conventional square wave signal, which has no requirement for accuracy and improves practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural block diagram of the narrow pulse generating circuit of the present utility model.

[0020] Figure 2 This is a circuit connection diagram of the narrow pulse generating circuit of the utility model.

[0021] Figure 3 This is a waveform diagram of the initial square wave signal and the narrow pulse signal of the utility model.

[0022] The accompanying drawings are:

[0023] 1. Microcontroller;

[0024] 2. Waveform processing unit; 21. Resistor R; 22. Capacitor C;

[0025] 3. AND gate operation unit; 4. Initial square wave signal; 5. Waveform processing signal. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] As attached Figure 1 , Attachment Figure 2 and attached Figure 3 A narrow pulse generating circuit is shown, which comprises: a microcontroller 1, a waveform processing unit 2 and an AND gate operation unit 3;

[0028] The microcontroller 1 is electrically connected to the waveform processing unit 2 and the AND gate operation unit 3 respectively, and the waveform processing unit 2 is electrically connected to the AND gate operation unit 3;

[0029] The microcontroller 1 is used to output an initial square wave signal 4 to the waveform processing unit 2 and the AND gate operation unit 3;

[0030] The waveform processing unit 2 is used to perform waveform processing on the initial square wave signal 4 and output the corresponding waveform processing signal 5 to the AND gate operation unit 3;

[0031] The AND gate operation unit 3 is used to perform an AND operation based on the initial square wave signal 4 and the waveform processing signal 5 to obtain a narrow pulse signal;

[0032] The AND gate operation unit 3 performs an AND operation on the waveform processing signal 5 output by the waveform processing unit 2 and the initial square wave signal 4 output by the microcontroller 1 to obtain a pulse signal. The pulse width can be adjusted by changing the parameters in the waveform processing unit 2. This circuit can generate narrow pulse signals with a relatively simple circuit design and low cost. Therefore, compared with existing circuits, the performance requirements of the microcontroller 1 are greatly reduced, and the cost is low and stable and reliable.

[0033] The parameters of the waveform processing unit 2 correspond to the pulse width of the narrow pulse generating circuit.

[0034] Among them, the narrow pulse generating circuit of the utility model is a narrow pulse waveform generating circuit based on a logic gate and gate;

[0035] Among them, the narrow pulse generating circuit provided by the present application only requires a microcontroller 1, a resistor R21, a capacitor C22, and an AND gate chip to be composed; therefore, the circuit complexity is reduced, the operation is stable and reliable, and the cost is low.

[0036] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the waveform processing unit 2 includes: a resistor R21 and a capacitor C22;

[0037] The signal output end of the microcontroller 1 is electrically connected to one end of the resistor R21 and the first input end of the AND gate operation unit 3 respectively, the other end of the resistor R21 is electrically connected to one end of the capacitor C22 and the second input end of the AND gate operation unit 3 respectively, and the other end of the capacitor C22 and the GND end of the AND gate operation unit 3 are both grounded.

[0038] After receiving the initial square wave signal 4 input by the microcontroller 1, the waveform processing unit 2 forms an RC circuit through the resistor R21 and the capacitor C22 to delay the signal. Since the capacitor C22 needs to be charged, the rising edge slope of the waveform processed signal 5 processed by the waveform processing unit 2 is reduced. As a result, a slope deviation occurs between the rising edge slope of the waveform processed signal 5 and the slope of the initial square wave signal 4, thereby generating a pulse waveform.

[0039] Example: The resistor R21 is 1KΩ and the capacitor C22 is 100nF;

[0040] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, one end of the resistor R21 connected to the signal output end of the microcontroller 1 is set as the input end of the waveform processing unit 2, and one end of the resistor R21 connected to the capacitor C22 is set as the output end of the waveform processing unit 2.

[0041] Among them, the first input end of the AND gate operation unit 3 receives the initial square wave signal 4 output from the microcontroller 1, and the second input end of the AND gate operation unit 3 receives the waveform processing signal 5 output by the waveform processing unit 2; therefore, the rising edge slope of the waveform processing signal 5 is reduced compared with the initial square wave signal 4 after being processed by the waveform processing unit 2; thus, it can be seen that the time for the waveform processing signal 5 to reach the second input end of the AND gate operation unit 3 will be delayed, and after the AND gate operation unit 3 performs an AND operation on the initial square wave signal 4 and the waveform processing signal 5, a narrow pulse signal can be obtained;

[0042] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3As shown, the resistance of resistor R21 and the capacitance of capacitor C22 correspond to the pulse width of the narrow pulse generating circuit;

[0043] If the resistance of the resistor R21 is fixed, the pulse width can be adjusted by adjusting the capacitor C22, making the pulse width adjustment of the circuit more convenient.

[0044] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the initial square wave signal 4 is a conventional square wave signal. The initial square wave signal 4 output by the microcontroller 1 has no requirement for accuracy, thereby improving practicality.

[0045] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the chip of AND gate operation unit 3 is set to SN74LVC1 G00DBVR chip;

[0046] The AND gate operation unit 3 is composed of a single AND gate chip.

[0047] The AND gate chip mentioned in this application is the SN74LVC1 G00DBVR chip, which is only a part of the embodiments of the present invention, not all examples. Usually, other AND gate chip models can be selected for the selection of AND gates.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A narrow pulse generating circuit, characterized in that: The narrow pulse generating circuit comprises: a microcontroller (1), a waveform processing unit (2) and an AND gate operation unit (3); The microcontroller (1) is electrically connected to the waveform processing unit (2) and the AND gate operation unit (3), respectively, and the waveform processing unit (2) is electrically connected to the AND gate operation unit (3); The microcontroller (1) is used to output an initial square wave signal (4) to the waveform processing unit (2) and the AND gate operation unit (3); The waveform processing unit (2) is used to perform waveform processing on the initial square wave signal (4) and output a corresponding waveform processing signal (5) to the AND gate operation unit (3); The AND gate operation unit (3) is used to perform an AND operation based on the initial square wave signal (4) and the waveform processing signal (5) to obtain a narrow pulse signal; The parameters of the waveform processing unit (2) correspond to the pulse width of the narrow pulse generating circuit.

2. A narrow pulse generating circuit according to claim 1, characterized in that: The waveform processing unit (2) includes: a resistor R (21) and a capacitor C (22); The signal output end of the microcontroller (1) is electrically connected to one end of the resistor R (21) and the first input end of the AND gate operation unit (3), respectively; the other end of the resistor R (21) is electrically connected to one end of the capacitor C (22) and the second input end of the AND gate operation unit (3), respectively; the other end of the capacitor C (22) and the GND end of the AND gate operation unit (3) are both grounded.

3. A narrow pulse generating circuit according to claim 2, characterized in that: One end of the resistor R (21) connected to the signal output end of the microcontroller (1) is set as the input end of the waveform processing unit (2), and one end of the resistor R (21) connected to the capacitor C (22) is set as the output end of the waveform processing unit (2).

4. A narrow pulse generating circuit according to claim 2, characterized in that: The resistance of the resistor R (21) and the capacitance of the capacitor C (22) correspond to the pulse width of the narrow pulse generating circuit.

5. The narrow pulse generating circuit according to claim 1, wherein: The initial square wave signal (4) is a conventional square wave signal.

6. The narrow pulse generating circuit according to claim 1, characterized in that: The chip of the AND gate operation unit (3) is set to be a SN74LVC1 G00DBVR chip.

Images