Pulse Width Stretching Circuit

Abstract

A pulse width broadening circuit comprises an electronic switch, a first resistor, a second resistor, a first capacitor and a first electronic switch module, wherein the electronic switch is used for selectively conducting connection or disconnection according to the level type of a pulse input signal of a control end, the first connecting end of the electronic switch is connected with a direct-current power source through the first resistor, and is ground through the first capacitor, and the second connecting end of the electronic switch is grounded; the control end of the first electronic switch module is connected with the first connecting end of the electronic switch, the first connecting end of the first electronic switch module is connected with the second connecting end of a first signal and is further connected with the direct-current power source through the second resistor, and the second connecting end of the first electronic switch module is grounded; when the control end voltage of the first electronic switch module is smaller than the first opening voltage of the first electronic switch module, the first connecting end and the second connecting end are disconnected, and when the control end voltage of the first electronic switch module is equal to or larger than the first opening voltage, the first connecting end is connected with the second connecting end. Energy consumption and interference signals can be reduced, and the pulse signals with various pulse widths can be conveniently deployed.

Description

technical field [0001] The invention relates to the field of pulse detection, in particular to a pulse width widening circuit. Background technique [0002] At present, most electronic devices, such as the microprocessor of a TV set, identify the input second connection port through a polling system. If the pre-stage output circuit or feedback circuit of the electronic device sends an abnormal narrow pulse signal (such as Pulse width signal) to the microprocessor, it will be difficult for the microprocessor to identify the pulse signal, unless the polling speed of the microprocessor is increased, but it will occupy most or even all of the resources of the microprocessor, making it impossible for the microprocessor to process Other jobs. [0003] In order to improve the recognition performance of the narrow pulse signal of the microprocessor, the width of the narrow pulse signal is generally widened by a pulse width widening device. However, the circuit structure of the exis...

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Problems solved by technology

[0002] At present, most electronic devices, such as the microprocessor of a TV set, identify the input second connection port through a polling system. If the pre-stage output circuit or feedback circuit of the electronic device sends an abnormal narrow pulse signal (such as Pulse width signal) to the microprocessor, it will be difficult for the microprocessor to identify the pulse signal, unless the polling speed of the microprocessor is increased, but it will occupy most or even all of the resources of the microprocessor, making it impossible for the microprocessor to process Other jobs

[0003] In order to improve the recognition performance of the narrow pulse signal of the microprocessor, the width of the narrow pulse signal is generally widened by a pulse width widening device. However, the circuit structure of the existing pulse width widening device is complicated, which will increase the energy consumption of electronic equipment and is easy to produce Interference signals such as spurious vibration waveforms affect signal stability, and often only widen a certain range of pulse width

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