CN214380845U - Programmable analog voltage signal control device based on pulse width modulation - Google Patents
Programmable analog voltage signal control device based on pulse width modulation Download PDFInfo
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- CN214380845U CN214380845U CN202023044974.XU CN202023044974U CN214380845U CN 214380845 U CN214380845 U CN 214380845U CN 202023044974 U CN202023044974 U CN 202023044974U CN 214380845 U CN214380845 U CN 214380845U
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Abstract
The utility model discloses an analog voltage signal controlling means able to programme based on pulse width modulation, including microprocessor, connect USB communication module and pulse width modulation signal output unit on microprocessor, the high-speed opto-coupler that input and pulse width modulation signal output unit are connected to and the pulse width modulation chip of being connected with high-speed opto-coupler output. The utility model discloses intelligent control output can realize converting pulse width modulation signal into analog voltage signal able to programme, the problem of jumping suddenly can not appear.
Description
Technical Field
The utility model relates to an optics electronic measurement control field specifically is an analog voltage signal controlling means able to programme based on pulse width modulation.
Background
Aiming at the existing control system for converting the pulse width modulation signal into the voltage output in the current market, most of the control systems use an analog chip for control, the control style is not intelligent enough, the circuit is complex, the knob for manually adjusting the adjustable resistor is used for stepless control, the fault of instant jump during the operation of the adjustable resistor occurs, and the voltage is 0. The programmable system for controlling the automatic output of the voltage in the market has the conditions of large power consumption, serious heating and the like. The price is very expensive, the volume is large, and the installation is inconvenient.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an analog voltage signal controlling means able to programme based on pulse width modulation can realize converting pulse width modulation signal to analog voltage signal able to programme, the problem of jumping suddenly can not appear.
The technical scheme of the utility model is that:
the programmable analog voltage signal control device based on pulse width modulation comprises a microprocessor, a USB communication module and a pulse width modulation signal output unit which are connected with the microprocessor, a high-speed optical coupler of which the input end is connected with the pulse width modulation signal output unit, and a pulse width modulation chip connected with the output end of the high-speed optical coupler; the USB communication module is used for receiving frequency and voltage data of a pulse width modulation signal to be output, the microprocessor outputs a pulse width modulation signal value with a corresponding duty ratio to the high-speed optical coupler through the pulse width modulation signal output unit, the high-speed optical coupler transmits the pulse width modulation signal value to the pulse width modulation chip, and the pulse width modulation chip converts the received pulse width modulation signal value into an analog voltage signal to be output.
The pulse width modulation chip is powered by an isolation power supply.
Microprocessor including microprocessor chip U1, pulse width modulation signal output unit integrate on microprocessor chip U1, USB communication module is including USB interface J1, USB interface J1 is connected on microprocessor chip U1's pin 30 and pin 31, the input of high-speed opto-coupler is connected with microprocessor chip U1's PWM output pin, the output of high-speed opto-coupler is connected with pulse width modulation chip U3's PWM input pin, be connected with protection circuit on pulse width modulation chip U3's the output, pulse width modulation chip U3's output is connected the analog voltage signal after the output modulation through protection circuit and output terminal W2.
The protection circuit comprises a filter capacitor C5 and a transient diode D1, one end of the filter capacitor C5, the negative electrode of the transient diode D1 and an output terminal W2 are all connected with the output end of the pulse width modulation chip U3, and the other end of the filter capacitor C5 and the positive electrode of the transient diode D1 are all grounded.
The utility model has the advantages that:
(1) the utility model discloses a USB interface communication receives the voltage size of wanting the output, adjusts the voltage of output through exporting pulse width modulation signal, can realize intelligent control through with the required voltage of host computer communication automatic control output, operates intelligence, simple, swift.
(2) The utility model is controlled by the microprocessor, intelligently controls the output, does not need to manually adjust the resistance, and has simple and easily realized circuit;
(3) the utility model discloses a pulse width modulation chip can export 0-5V or 0-10V's adjustable analog voltage value, and the voltage error of output is less than 1%, and the linearity error is less than 0.5%, and the frequency can compatible 1Hz to 1MHz, and the frequency range of work is wide.
(4) The utility model discloses an opto-coupler isolation and isolation power supply circuit can guarantee every module autonomous working, each other noninterference, and the circuit consumption that adopts is little, and the price is low, and is small, simple to operate.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a circuit diagram of the present invention for connecting the microprocessor and the USB communication module.
Fig. 3 is a circuit connection diagram of the high-speed optical coupler and the pulse width modulation chip of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the programmable analog voltage signal control device based on pulse width modulation comprises a microprocessor 1, a USB communication module 2 and a pulse width modulation signal output unit 3 connected to the microprocessor 1, a high-speed optical coupler 4 with an input end connected to the pulse width modulation signal output unit 3, and a pulse width modulation chip 5 connected to an output end of the high-speed optical coupler 4; the pulse width modulation chip 5 is powered by an isolation power supply 6, and the output end of the pulse width modulation chip 6 is connected with a protection circuit 7.
The USB communication module 2 is used for receiving the frequency and voltage data of the pulse width modulation signal to be output;
the microprocessor 1 obtains the frequency of PWM to be output and the corresponding duty ratio through analyzing data, and outputs a pulse width modulation signal value with the corresponding duty ratio to the high-speed optical coupler 4 through a pulse width modulation signal output unit (PWM output unit) 3;
the high-speed optical coupler 4 is an electric-to-optical-to-electric conversion device for transmitting electric signals by taking light as a medium, and consists of a light emitting source and a light receiving device, wherein the light emitting source and the light receiving device are assembled in the same closed shell and are isolated from each other by a transparent insulator, so that the input and output electric signals are isolated, and the input end of the high-speed optical coupler belongs to a low-resistance element working in a current mode, so that the high-speed optical coupler has strong common-mode rejection capability;
the high-speed optical coupler 4 transmits a pulse width modulation signal value to the pulse width modulation chip 5, the pulse width modulation chip 5 is a high-performance conversion chip (pulse width modulation to analog voltage converter), the frequency of an input pulse width modulation signal can be compatible with 1Hz to 1MHz, the output voltage range is 0-5V or 0-10V, the output voltage error is less than 1%, the linearity error is less than 0.5%, and the pulse width modulation chip converts the received pulse width modulation signal value into an analog voltage signal to be output;
the isolation power supply 6 supplies power to the pulse width modulation chip independently, so that the pulse width modulation chip is prevented from being damaged by high-voltage discharge or other reasons and other modules, and each module can work independently and is not interfered;
the protection circuit 7 is composed of a transient diode D1 and a filter capacitor C5, and when the transient diode D1 is subjected to a transient high-energy shock, it can make its impedance decrease suddenly at a very high speed, and at the same time, it can absorb a large current to clamp the voltage between its two terminals at a predetermined value, so as to ensure that the following circuit elements are not damaged by the transient high-energy shock.
The duty cycle refers to the ratio of time the high level occupies within one period. The duty cycle of the square wave is 50%, the duty cycle is 0.5, which indicates that the time occupied by the positive level is 0.5 cycle. If the period of the signal is T, the high level time is T1, the low level time is T2, and T is T1+ T2, the duty ratio D is T1/T. The duty ratio of PWM is the pulse width time/PWM period, and the output analog voltage value is the peak voltage × the duty ratio of PWM. For example: the selected analog quantity is 0-10V, and when the frequency is 1000Hz and the duty ratio is 50%, the output analog voltage is 5V; the analog quantity is selected to be 0-5V, and when the frequency is 5kHz and the duty ratio is 20%, the output analog voltage is 1V.
Referring to fig. 2 and 3, the microprocessor 1 includes a microprocessor chip U1, the PWM signal output unit 3 is integrated on a microprocessor chip U1, the USB communication module 2 includes a USB interface J1, the USB interface J1 is connected to a pin 30 and a pin 31 of the microprocessor chip U1, an input end of a high-speed optical coupler U2 is connected to a PWM output pin (pin 11) of the microprocessor chip U1, an output end of the high-speed optical coupler U2 is connected to a PWM input pin (pin 3) of the PWM chip U3, the PWM chip U3 is powered by a 10-40V isolation power supply W1, an output end of the PWM chip U3 is connected to a protection circuit, and an output end (pin 6) of the PWM chip U3 is connected to an output terminal W2 through the protection circuit to output a modulated analog voltage signal; the protection circuit 7 comprises a filter capacitor C5 and a transient diode D1, one end of the filter capacitor C5, the negative electrode of the transient diode D1 and the output terminal W2 are all connected with the output end of the pulse width modulation chip U3, and the other end of the filter capacitor C5 and the positive electrode of the transient diode D1 are all grounded.
A pin 11 of the microcontroller U1 outputs a pulse width modulation signal with 1Hz-1MHz and a duty ratio of 0-100%, the pulse width modulation signal is output to a pulse width modulation chip U3 through a high-speed optical coupler U2, the pulse width modulation chip U3 converts the received pulse width modulation signal values with different duty ratios into analog voltage signals with analog quantity of 0-5V or 0-10V, and the analog voltage signals are output through an output terminal W2.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. Programmable analog voltage signal control device based on pulse width modulation, its characterized in that: the device comprises a microprocessor, a USB communication module and a pulse width modulation signal output unit which are connected with the microprocessor, a high-speed optical coupler of which the input end is connected with the pulse width modulation signal output unit, and a pulse width modulation chip connected with the output end of the high-speed optical coupler; the USB communication module is used for receiving frequency and voltage data of a pulse width modulation signal to be output, the microprocessor outputs a pulse width modulation signal value with a corresponding duty ratio to the high-speed optical coupler through the pulse width modulation signal output unit, the high-speed optical coupler transmits the pulse width modulation signal value to the pulse width modulation chip, and the pulse width modulation chip converts the received pulse width modulation signal value into an analog voltage signal to be output.
2. The pulse width modulation-based programmable analog voltage signal control device of claim 1, wherein: the pulse width modulation chip is powered by an isolation power supply.
3. The pulse width modulation-based programmable analog voltage signal control device of claim 2, wherein: microprocessor including microprocessor chip U1, pulse width modulation signal output unit integrate on microprocessor chip U1, USB communication module is including USB interface J1, USB interface J1 is connected on microprocessor chip U1's pin 30 and pin 31, the input of high-speed opto-coupler is connected with microprocessor chip U1's PWM output pin, the output of high-speed opto-coupler is connected with pulse width modulation chip U3's PWM input pin, be connected with protection circuit on pulse width modulation chip U3's the output, pulse width modulation chip U3's output is connected the analog voltage signal after the output modulation through protection circuit and output terminal W2.
4. The pulse width modulation-based programmable analog voltage signal control device of claim 3, wherein: the protection circuit comprises a filter capacitor C5 and a transient diode D1, one end of the filter capacitor C5, the negative electrode of the transient diode D1 and an output terminal W2 are all connected with the output end of the pulse width modulation chip U3, and the other end of the filter capacitor C5 and the positive electrode of the transient diode D1 are all grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023044974.XU CN214380845U (en) | 2020-12-16 | 2020-12-16 | Programmable analog voltage signal control device based on pulse width modulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023044974.XU CN214380845U (en) | 2020-12-16 | 2020-12-16 | Programmable analog voltage signal control device based on pulse width modulation |
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| Publication Number | Publication Date |
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| CN214380845U true CN214380845U (en) | 2021-10-08 |
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| CN202023044974.XU Active CN214380845U (en) | 2020-12-16 | 2020-12-16 | Programmable analog voltage signal control device based on pulse width modulation |
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