CN206117617U

CN206117617U - Pulse -width modulation (PWM) pulse generator

Info

Publication number: CN206117617U
Application number: CN201620998458.5U
Authority: CN
Inventors: 李天怡
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2017-04-19
Anticipated expiration: 2026-08-30

Abstract

The utility model discloses a pulse -width modulation (PWM) pulse generator, including the D trigger, the data input end and the clock input end of D trigger all link to each other with power VDD, the reset terminal of D trigger is all the way through adjustable electric capacity C1 ground connection, and another way links to each other with diode VD1 with controlling resistor R1 respectively, after diode VD1 and controlling resistor R1 are parallelly connected and the forward output of D trigger links to each other, the set of D trigger end is all the way through adjustable electric capacity C2 ground connection, and another way links to each other with diode VD2 with controlling resistor R2 respectively, after diode VD2 and controlling resistor R2 are parallelly connected and the reverse output of D trigger links to each other. The experiment apparatus is low in cost.

Description

Pwm pulse generator

Technical field

This utility model is related to a kind of pulse generator, is specifically related to a kind of pwm pulse generator.

Background technology

PWM (pulse width modulation) is a kind of conventional pulse, is had a wide range of applications, and it is output as a kind of pulse width variability Square wave.In order to produce the square wave of this variable-width, generally controlled using processor such as single-chip microcomputer, DSP etc. at present The opening of switching tube and closing, so as to export the PWM ripples of different in width, but need to use single-chip microcomputer, DSP in this process It is relatively costly Deng integrated device, and the programming of these devices is also complex with operation.

Utility model content

For the defect of prior art, this utility model provides a kind of pwm pulse generator.

A kind of pwm pulse generator, including d type flip flop, the data input pin and input end of clock of the d type flip flop with Power vd D is connected, and the reset terminal of the d type flip flop leads up to tunable capacitor C1 ground connection, another road respectively with adjustable resistance R1 It is connected with diode VD1, is connected with the positive outfan of the d type flip flop after diode VD1 and adjustable resistance R1 is in parallel；It is described The set end of d type flip flop leads up to tunable capacitor C2 ground connection, and another road is connected respectively with adjustable resistance R2 and diode VD2, It is connected with the inverse output terminal of the d type flip flop after diode VD2 and adjustable resistance R2 are in parallel.

The beneficial effects of the utility model are：With d type flip flop as core, it is not necessary to overall using during single-chip microcomputer or DSP etc. Simple structure, low cost.

Description of the drawings

Fig. 1 is the structural representation of this utility model generator；

Fig. 2 is the oscillogram of this utility model pwm pulse.

Specific embodiment

It is understandable to enable above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with the accompanying drawings to this The specific embodiment of utility model is described in detail, and incites somebody to action above and other purpose of the present utility model, feature and advantage Become apparent from.Identical reference indicates identical part in whole accompanying drawings.Not deliberately accompanying drawing drawn to scale, emphasis It is that purport of the present utility model is shown.

As shown in Figure 1, 2, a kind of pwm pulse generator, including d type flip flop, the D ends (data input of the d type flip flop End) and CP ends (input end of clock) be connected with power vd D, the R ends (reset terminal) of the d type flip flop lead up to tunable capacitor C1 is grounded, and another road is connected respectively with adjustable resistance R1 and diode VD1, with institute after diode VD1 and adjustable resistance R1 is in parallel The Q ends (positive outfan) for stating d type flip flop are connected；The S ends (set end) of the d type flip flop lead up to tunable capacitor C2 and connect Ground, another road is connected respectively with adjustable resistance R2 and diode VD2, touches with the D after diode VD2 and adjustable resistance R2 is in parallel Send out deviceEnd (inverse output terminal is connected).

This utility model constitutes pwm pulse generator using d type flip flop, and during power-up, because D terminates high level, therefore Q is exported For 1, charge to C1 by R2, when C voltage is more than R ends trigging signal, Q is changed into 0,It is changed into l.High level further through R2 Charge to C2, until voltage makes Q become l again more than S ends trigging signal on C2.Circuit repeats said process, forms pwm pulse, The effect of VDl and VD2 is to provide repid discharge path for C1 and C2.The cycle of oscillation of circuit is T=0.7 (R1C1+R2C2), this Sample just can produce the PWM ripples of different frequency by adjusting the value of R1, R2, C1, C2.

Elaborate many details in order to fully understand this utility model in the above description.But above description Only it is preferred embodiment of the present utility model, this utility model can be with much next different from alternate manner described here Implement, therefore this utility model is not embodied as being limited by disclosed above.Simultaneously any those skilled in the art exist Under without departing from technical solutions of the utility model ambit, the methods and techniques content all using the disclosure above is new to this practicality Type technical scheme makes many possible variations and modification, or the Equivalent embodiments for being revised as equivalent variations.It is every without departing from this The content of utility model technical scheme, any simply repaiies according to technical spirit of the present utility model to made for any of the above embodiments Change, equivalent variations and modification, still fall within the range of technical solutions of the utility model protection.

Claims

1. a kind of pwm pulse generator, it is characterised in that including d type flip flop, the data input pin and clock of the d type flip flop Input is connected with power vd D, and the reset terminal of the d type flip flop leads up to tunable capacitor C1 ground connection, another road respectively with Adjustable resistance R1 is connected with diode VD1, with the forward direction output of the d type flip flop after diode VD1 and adjustable resistance R1 is in parallel End is connected；The set end of the d type flip flop lead up to tunable capacitor C2 ground connection, another road respectively with adjustable resistance R2 and two poles Pipe VD2 is connected, and is connected with the inverse output terminal of the d type flip flop after diode VD2 and adjustable resistance R2 is in parallel.