CN209659273U - DAC conversion circuit - Google Patents
DAC conversion circuit Download PDFInfo
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- CN209659273U CN209659273U CN201920355394.0U CN201920355394U CN209659273U CN 209659273 U CN209659273 U CN 209659273U CN 201920355394 U CN201920355394 U CN 201920355394U CN 209659273 U CN209659273 U CN 209659273U
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Abstract
A kind of DAC conversion circuit, including pwm signal input module, RC smothing filtering module, amplifier conversion module and amplifier output module.The pwm signal input module is connected with RC smothing filtering module, and RC smothing filtering module is connected with amplifier conversion module and amplifier conversion module is connected with amplifier output module.The utility model DAC conversion circuit can satisfy while communicate between controller and sensor, and circuit design is simple, at low cost.
Description
Technical field
The utility model relates to a kind of circuit, especially a kind of DAC conversion circuit.
Background technique
Industry Control industry automation trend is more and more obvious at present, and sensor used is also more and more.General biography
Sensor input and output are all analog voltage signals, however, brain PLC (the Programmable Logic automated the most
Controller), the controllers such as MCU (Microcontroller Unit) are the control assembly based on digital circuit.Therefore,
In order to which controller can be communicated with sensor, it is necessary to carry out DAC (igital to analog converter, digital-to-analogue)
Conversion.
Utility model content
In order to overcome drawbacks described above, the utility model provides a kind of DAC conversion circuit, which has conversion
The advantages that precision is high, voltage range is wide, at low cost.
The utility model is to solve technical solution used by its technical problem: a kind of DAC conversion circuit, including
Pwm signal input module, RC smothing filtering module, amplifier conversion module and amplifier output module, the pwm signal input mould
Block is connected with RC smothing filtering module, and RC smothing filtering module is connected with amplifier conversion module and amplifier conversion module and amplifier are defeated
Module connects out.
The pwm signal input module includes signal source a V4, the RC as a further improvement of the utility model,
Smothing filtering module includes two resistance R9, R10 and three capacitors C1, C2, C3, one end and the signal source V4 phase of the resistance R9
Even and the other end of resistance R9 is connected with capacitor C1, and one end of the resistance R10 is connected with the other end of resistance R9 and resistance R10
The other end while be connected with capacitor C2 C2 and C3 it is in parallel, described capacitor C1, C2, C3 are grounded.
The signal source V4 is the PWM output port in IC chip as a further improvement of the utility model,.
The amplifier conversion module includes two resistance R1, R2 and one as a further improvement of the utility model,
The first operational amplifier of analog signal, the positive input 5 and electricity of the first operational amplifier can be converted digital signals into
The other end for hindering R10 is connected, and the reverse input end 6 of the first operational amplifier is grounded after connecting with resistance R1, the both ends of resistance R2
It is connected respectively with the output end 7 of the reverse input end 6 of the first operational amplifier and the first operational amplifier.
As a further improvement of the utility model, the amplifier output module include second operational amplifier, resistance R4,
R5, R6, R7, R8 and a reference voltage V1, the positive input 3 and resistance R4, the first operation of the second operational amplifier
The output end 7 of amplifier connect while series connection with resistance R5 ground connection, the reverse input end 2 of second operational amplifier with it is electric
Hinder R6, reference voltage V1 series connection ground connection, the reverse input end 2 of second operational amplifier and the output end 1 of second operational amplifier
Between by resistance R7, R8 be connected in series.
It as a further improvement of the utility model, further include to the first operational amplifier, second operational amplifier power supply
Negative voltage DC power supply V2 and positive voltage DC power supply V3, the positive voltage DC power supply V3 be connected to the first operational amplifier
Electrode input end and second operational amplifier electrode input end, negative voltage DC power supply V2 is connected to the first operational amplifier
Negative input and second operational amplifier negative input.
The negative voltage DC power supply V2 is minus 15 volts as a further improvement of the utility model, positive voltage direct current
Source V3 is positive 15 volts.
The beneficial effects of the utility model are: the utility model DAC conversion circuit is based on common amplifier and Resistor-Capacitor Unit will
Digital signal is converted into analog signal, and while communication between controller and sensor so as to meet, circuit design is simple,
It is at low cost.
Detailed description of the invention
Fig. 1 is the module diagram of the utility model DAC conversion circuit.
Fig. 2 is the schematic diagram of the utility model DAC conversion circuit.
Fig. 3 be the utility model DAC conversion circuit first simulation waveform, denote PWM output duty cycle be 0 when
Between signal source and resistance R9, between the output end and resistance R4 of the first operational amplifier and between resistance R7 and R8
Analog output voltage value.
Fig. 4 is second simulation waveform of the utility model DAC conversion circuit, and denoting PWM output duty cycle is 1/4
When between signal source and resistance R9, between the output end and resistance R4 of the first operational amplifier and between resistance R7 and R8
Analog output voltage value.
Fig. 5 is the third simulation waveform of the utility model DAC conversion circuit, and denoting PWM output duty cycle is 1/2
When between signal source and resistance R9, between the output end and resistance R4 of the first operational amplifier and between resistance R7 and R8
Analog output voltage value.
Fig. 6 is the 4th simulation waveform of the utility model DAC conversion circuit, and denoting PWM output duty cycle is 3/4
When between signal source and resistance R9, between the output end and resistance R4 of the first operational amplifier and between resistance R7 and R8
Analog output voltage value.
Fig. 7 be the utility model DAC conversion circuit the 5th simulation waveform, denote PWM output duty cycle be 1 when
Between signal source and resistance R9, between the output end and resistance R4 of the first operational amplifier and between resistance R7 and R8
Analog output voltage value.
The figures above is compareed, explanation is supplemented as follows:
V4--- signal source C1, C2, C3--- capacitor
R1, R2, R4, R5, R6, R7, R8, R9--- resistance
V1--- reference voltage
V2, V3--- DC power supply
V4--- signal source
The positive input of the first operational amplifier of 5---
The reverse input end of the first operational amplifier of 6---
The output end of the first operational amplifier of 7---
The positive input of 3--- second operational amplifier
The reverse input end of 2--- second operational amplifier
The output end of 1--- second operational amplifier
Specific embodiment
Please refer to Fig. 1 and Fig. 2, a kind of DAC conversion circuit, including pwm signal input module, RC smothing filtering module, fortune
Put conversion module and amplifier output module.The pwm signal input module is connected with RC smothing filtering module, RC smothing filtering
Module is connected with amplifier conversion module and amplifier conversion module is connected with amplifier output module.
Referring to FIG. 2, the pwm signal input module includes a signal source V4, the RC smothing filtering module includes
Two resistance R9, R10 and three capacitors C1, C2, C3, one end of the resistance R9 be connected with signal source V4 and resistance R9 it is another
End is connected with capacitor C1, and one end of the resistance R10 is connected with the other end of resistance R9 and the other end of resistance R10 and capacitor C2
C2 and C3 is in parallel while being connected, and described capacitor C1, C2, C3 are grounded.Pwm signal is exactly Pulse Width
Modulation, pulse width modulating signal.It after pwm signal generates, realizes and filters by RC smothing filtering module, export one
DAC voltage.R in RC refers to Resistor, resistor；C refers to Capacitance, capacitor.
In preferred embodiment, the signal source V4 is the PWM output port in IC chip.
Referring to FIG. 2, the amplifier conversion module includes that two resistance R1, R2 and one can convert digital signal
At the first operational amplifier of analog signal, the positive input 5 of the first operational amplifier is connected with the other end of resistance R10,
The reverse input end 6 of first operational amplifier is grounded after connecting with resistance R1, the both ends of resistance R2 respectively with the first operation amplifier
The reverse input end 6 of device is connected with the output end 7 of the first operational amplifier, so that amplifier conversion module can be by digital signal
Be converted to analog signal.
Referring to FIG. 2, the amplifier output module includes second operational amplifier, resistance R4, R5, R6, R7, R8 and one
Reference voltage V1, the positive input 3 and resistance R4 of the second operational amplifier, the output end 7 of the first operational amplifier are gone here and there
Join ground connection of connecting while connection with resistance R5, the reverse input end 2 and resistance R6, reference voltage V1 of second operational amplifier are gone here and there
Connection ground, passes through resistance R7, R8 between the reverse input end 2 of second operational amplifier and the output end 1 of second operational amplifier
It is connected in series, to be exported after the analog signal amplification that amplifier output module can will convert into.
Referring to FIG. 2, the utility model DAC conversion circuit further includes to the first operational amplifier, second operational amplifier
The negative voltage DC power supply V2 of power supply and positive voltage DC power supply V3, the positive voltage DC power supply V3 are connected to the first operation and put
The big electrode input end of device and the electrode input end of second operational amplifier, negative voltage DC power supply V2 are connected to the first operation and put
The big negative input of device and the negative input of second operational amplifier, thus simultaneously to two amplifier power supplies.
In specific embodiment, the negative voltage DC power supply V2 is minus 15 volts, and positive voltage DC power supply V3 is positive 15 volts.
Referring to FIG. 2, the utility model is put between signal source and resistance R9, in the first operation respectively by three probes
Detecting voltage value is carried out between the output end and resistance R4 of big device and between resistance R7 and R8；Fig. 3 to Fig. 7 is indicated respectively
When PWM output duty cycle is 0,1/4,1/2,3/4,1, the simulation waveform of above three position voltage value.
The utility model DAC conversion circuit is based on common amplifier and Resistor-Capacitor Unit converts digital signals into analog signal,
While communication between controller and sensor so as to meet, circuit design is simple, at low cost.
Claims (7)
1. a kind of DAC conversion circuit, it is characterized in that: including pwm signal input module, RC smothing filtering module, amplifier modulus of conversion
Block and amplifier output module, the pwm signal input module are connected with RC smothing filtering module, RC smothing filtering module and fortune
It puts conversion module connection and amplifier conversion module is connected with amplifier output module.
2. DAC conversion circuit according to claim 1, it is characterized in that: the pwm signal input module includes a signal
Source V4, the RC smothing filtering module include two resistance R9, R10 and three capacitors C1, C2, C3, one end of the resistance R9
It is connected with signal source V4 and the other end of resistance R9 is connected with capacitor C1, one end of the resistance R10 and the other end of resistance R9
C2 and C3 is in parallel while connected and resistance R10 other end is connected with capacitor C2, and described capacitor C1, C2, C3 are grounded.
3. DAC conversion circuit according to claim 2, it is characterized in that: the signal source V4 is the PWM output in IC chip
Port.
4. DAC conversion circuit according to claim 2, it is characterized in that: the amplifier conversion module include two resistance R1,
R2 and one can convert digital signals into the first operational amplifier of analog signal, and the forward direction of the first operational amplifier is defeated
Enter end 5 to be connected with the other end of resistance R10, the reverse input end 6 of the first operational amplifier is grounded after connecting with resistance R1, resistance
The both ends of R2 are connected with the output end 7 of the reverse input end 6 of the first operational amplifier and the first operational amplifier respectively.
5. DAC conversion circuit according to claim 4, it is characterized in that: the amplifier output module includes that the second operation is put
Big device, resistance R4, R5, R6, R7, R8 and a reference voltage V1, the positive input 3 and resistance of the second operational amplifier
R4, the first operational amplifier output end 7 connect with resistance R5 ground connection while be connected in series, second operational amplifier it is reversed
Input terminal 2 is connected ground connection with resistance R6, reference voltage V1, the reverse input end 2 and the second operation amplifier of second operational amplifier
It is connected in series between the output end 1 of device by resistance R7, R8.
6. DAC conversion circuit according to claim 5, it is characterized in that: further including to the first operational amplifier, the second operation
The negative voltage DC power supply V2 and positive voltage DC power supply V3, the positive voltage DC power supply V3 of amplifier power supply are connected to first
The electrode input end of operational amplifier and the electrode input end of second operational amplifier, negative voltage DC power supply V2 are connected to first
The negative input of operational amplifier and the negative input of second operational amplifier.
7. DAC conversion circuit according to claim 6, it is characterized in that: the negative voltage DC power supply V2 is minus 15 volts, just
Voltage DC power supply V3 is positive 15 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920355394.0U CN209659273U (en) | 2019-03-20 | 2019-03-20 | DAC conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920355394.0U CN209659273U (en) | 2019-03-20 | 2019-03-20 | DAC conversion circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209659273U true CN209659273U (en) | 2019-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920355394.0U Active CN209659273U (en) | 2019-03-20 | 2019-03-20 | DAC conversion circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818619A (en) * | 2019-03-20 | 2019-05-28 | 昆山艾派科技有限公司 | DAC conversion circuit |
-
2019
- 2019-03-20 CN CN201920355394.0U patent/CN209659273U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818619A (en) * | 2019-03-20 | 2019-05-28 | 昆山艾派科技有限公司 | DAC conversion circuit |
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