CN205377830U - Analog output circuit - Google Patents
Analog output circuit Download PDFInfo
- Publication number
- CN205377830U CN205377830U CN201620129824.3U CN201620129824U CN205377830U CN 205377830 U CN205377830 U CN 205377830U CN 201620129824 U CN201620129824 U CN 201620129824U CN 205377830 U CN205377830 U CN 205377830U
- Authority
- CN
- China
- Prior art keywords
- circuit
- operational amplifier
- audion
- amplifier
- triode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to an analog output circuit, this circuit include optical coupling isolation circuit, RC circuit, an operational amplifier and triode Q1, the optical coupling isolation circuit is including the light emitting diode and the triode that are used for connecting the PWM signal, an operational amplifier's non inverting input end is connected to the collecting electrode of triode through RC filter circuit, triode Q1's base is connected to an operational amplifier's output, triode Q1's projecting pole feedback connection operational amplifier's inverting input end, the non inverting input end of second operation amplifier is connected to the collecting electrode of triode, the output of second operation amplifier is connected with an amplifier circuit, amplifier circuit's output is connected the inverting input end of second operation amplifier. The cost has greatly been practiced thrift to this circuit under the prerequisite of guaranteeing output precision and stability, the peripheral circuit is simple, saves space.
Description
Technical field
This utility model belongs to measure and control instrument technical field, is specifically related to a kind of analogue quantity output circuit.
Background technology
During the analog output function of onsite application device, traditional analogue quantity output circuit is generally adopted analog output chip or analog output module, and when needs multi-analog exports, the peripheral loop of traditional analogue quantity output circuit is more complicated, relatively costly.
Utility model content
This utility model provides a kind of analogue quantity output circuit, to solve the problem that traditional analog amount output circuit peripheral circuit is complex and high cost when needing multi-analog to export.
For solving above-mentioned technical problem, analogue quantity output circuit of the present utility model includes optical coupling isolation circuit, RC filter circuit, first operational amplifier and audion Q1, pwm signal is accessed on the former limit of described optical coupling isolation circuit, the secondary of optical coupling isolation circuit connects the in-phase input end of the first operational amplifier through RC filter circuit, the base stage of the outfan connecting triode Q1 of described first operational amplifier, the emitter stage of described audion Q1 is connected respectively inverting input and the ground of operational amplifier through sub-resistance R14 and resistance R4, the colelctor electrode of described audion Q1 connects the in-phase input end of the second operational amplifier, the outfan of described second operational amplifier is connected to an amplifying circuit, the outfan of described amplifying circuit is connected to the inverting input of described second operational amplifier.
Described RC filter circuit is two-stage RC filter circuit.
Described amplifying circuit is two-stage amplifier circuit, is made up of two audion Q5, Q2 direct-couplings.
The colelctor electrode of described audion Q1 connects power supply by anti-reverse diode D1.
The emitter stage of audion Q2 ground connection after the circuit that two Capacitance parallel connections form in described amplifying circuit.
In described amplifying circuit, the emitter stage of audion Q5 and the colelctor electrode of audion connect power supply through anti-reverse diode D1.
Analogue quantity output circuit of the present utility model uses two stage amplifer and audion to coordinate and realizes crossing current output, under ensureing the premise of output accuracy and stability, has greatly saved cost, and peripheral circuit is simple, saves space.
Accompanying drawing explanation
Fig. 1 is the analogue quantity output circuit schematic diagram of the present embodiment.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail.
The analogue quantity output circuit of the present embodiment includes optical coupling isolation circuit, RC circuit, first operational amplifier and audion Q1, described optical coupling isolation circuit includes the Light-Emitting Diode for connecting pwm signal and audion, the colelctor electrode of described audion connects the in-phase input end of the first operational amplifier through RC filter circuit, the base stage of the outfan connecting triode Q1 of described first operational amplifier, the inverting input of the emitter stage feedback link operational amplifier of described audion Q1, the colelctor electrode of described audion connects the in-phase input end of the second operational amplifier, the outfan of described second operational amplifier is connected to an amplifying circuit, the outfan of described amplifying circuit is connected to the inverting input of described second operational amplifier.
As it is shown in figure 1, the pwm signal that PWM_1 is MCU output, AO_1 is analog quantity output signals, AO_12V is power supply signal, and 12V_GND is ground, and U1 is photoelectrical coupler, U2, U3 are operational amplifier, D1 is anti-reverse diode, and Q1, Q2, Q5 are audion, and R1, R2, R3, R4, R9, R11, R13, R14, R17 are resistance, C1, C3, C5, C6 are electric capacity, wherein, C1 is tantalum electric capacity, and C3 is ceramic condenser.
The photoelectrical coupler of the present embodiment includes Light-Emitting Diode and audion, and the negative pole K end of Light-Emitting Diode connects pwm signal, is connected RC filter circuit, and the colelctor electrode of audion connects power supply after resistance R1 between the colelctor electrode of audion and emitter stage.RC filter circuit is two-stage RC filter circuit, and this filter circuit includes electric capacity C5, C6 and resistance R9 and R11.RC filter circuit connects the in-phase input end of the first order amplifier in two stage amplifer, the outfan connecting triode Q1 of first order amplifier, and the emitter stage of Q1 is through the inverting input of resistance R14 feedback link first order amplifier, through R4 ground connection.
The colelctor electrode of audion connects the in-phase input end of second level amplifier, and connects power supply through resistance R2 and anti-reverse diode D1, and the outfan of second level amplifier connects amplifying circuit.Amplifying circuit is two-stage amplifier circuit, this two-stage amplifier circuit includes audion Q5 and Q2, the base stage of audion Q5 connects the outfan of the second operational amplifier, the base stage of colelctor electrode connecting triode Q2, the colelctor electrode of Q2 and the emitter stage of Q5 are connected on the inverting input of the second operational amplifier, and connect diode D1 connection power supply by resistance R17 with putting back.The emitter stage of audion Q2 ground connection after the parallel circuit of electric capacity C1 and electric capacity C3.
The operation principle of the analogue quantity output circuit of the present embodiment is: by MCU output pwm signal, after light-coupled isolation, convert the square-wave signal of 24V peak value to, filter then through two grades of RC, direct current signal Vin is to prime amplifier in output, by comparing with the magnitude of voltage on sample resistance, control the online row district of audion Q1 work, the in-phase end voltage being input to rear class amplifier is made linearly to change with the change of Vin, the level output being made end of oppisite phase by the clamp of two grades of amplifiers is constant, and make triode ON work in amplifying circuit, reach the purpose of output constant current, outfan uses tantalum electric capacity and ceramic condenser in parallel, play the effect of filtering interfering.
Claims (6)
1. an analogue quantity output circuit, it is characterized in that, this circuit includes optical coupling isolation circuit, RC filter circuit, first operational amplifier and audion Q1, pwm signal is accessed on the former limit of described optical coupling isolation circuit, the secondary of optical coupling isolation circuit connects the in-phase input end of the first operational amplifier through RC filter circuit, the base stage of the outfan connecting triode Q1 of described first operational amplifier, the emitter stage of described audion Q1 is connected respectively inverting input and the ground of operational amplifier through sub-resistance R14 and resistance R4, the colelctor electrode of described audion Q1 connects the in-phase input end of the second operational amplifier, the outfan of described second operational amplifier is connected to an amplifying circuit, the outfan of described amplifying circuit is connected to the inverting input of described second operational amplifier.
2. analogue quantity output circuit according to claim 1, it is characterised in that described RC filter circuit is two-stage RC filter circuit.
3. analogue quantity output circuit according to claim 1, it is characterised in that described amplifying circuit is two-stage amplifier circuit, is made up of two audion Q5, Q2 direct-couplings.
4. analogue quantity output circuit according to claim 1, it is characterised in that the colelctor electrode of described audion Q1 connects power supply by anti-reverse diode D1.
5. analogue quantity output circuit according to claim 3, it is characterised in that the emitter stage of audion Q2 ground connection after the circuit that two Capacitance parallel connections form in described amplifying circuit.
6. analogue quantity output circuit according to claim 3, it is characterised in that in described amplifying circuit, the emitter stage of audion Q5 and the colelctor electrode of audion connect power supply through anti-reverse diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620129824.3U CN205377830U (en) | 2016-02-19 | 2016-02-19 | Analog output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620129824.3U CN205377830U (en) | 2016-02-19 | 2016-02-19 | Analog output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205377830U true CN205377830U (en) | 2016-07-06 |
Family
ID=56271851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620129824.3U Expired - Fee Related CN205377830U (en) | 2016-02-19 | 2016-02-19 | Analog output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205377830U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062054A (en) * | 2017-12-22 | 2018-05-22 | 深圳市英威腾电气股份有限公司 | A kind of analog signals output circuit |
| CN109633953A (en) * | 2019-02-15 | 2019-04-16 | 天马微电子股份有限公司 | A kind of liquid crystal grating driving circuit, light valve and display device |
-
2016
- 2016-02-19 CN CN201620129824.3U patent/CN205377830U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062054A (en) * | 2017-12-22 | 2018-05-22 | 深圳市英威腾电气股份有限公司 | A kind of analog signals output circuit |
| CN109633953A (en) * | 2019-02-15 | 2019-04-16 | 天马微电子股份有限公司 | A kind of liquid crystal grating driving circuit, light valve and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204836096U (en) | Piezoelectric acceleration sensor's charge amplifier | |
| CN205037982U (en) | Utilize constant current source temperature detection circuit of operational amplifier characteristic | |
| CN103323653B (en) | A kind of low limit sample circuit | |
| CN205377830U (en) | Analog output circuit | |
| CN204009646U (en) | A kind of regulated power supply continuous current controller | |
| CN204989290U (en) | Wide dynamic range's high -pressure side current detection circuit | |
| CN201903573U (en) | Current detection and amplification circuit used for two-wire manufactured instrument | |
| CN205038006U (en) | Pressure collecting circuit of constant current source driving pressure sensor | |
| CN101707829B (en) | Lamp control circuit | |
| CN204362002U (en) | A kind of digital audio frequency power amplifier | |
| CN204131469U (en) | For calibrating the accurate alternating voltage amplifier of lightning arrester block property current tester | |
| CN207968875U (en) | A kind of buzzer loudspeaker multiplex circuit and sound-producing device | |
| CN206573967U (en) | A kind of positive and negative adjustable D.C. regulated power supply | |
| CN204697020U (en) | A kind of dual output constant current-supplying circuit for preamplifier | |
| CN204316738U (en) | Based on phase shift process from gain wide region audio frequency processing system | |
| CN216356648U (en) | Power amplifying circuit | |
| CN204886882U (en) | Preamplifier | |
| CN203313128U (en) | Novel infrared amplifying circuit | |
| CN204283401U (en) | A kind of array induction logging tool receiving circuit | |
| CN204719050U (en) | A kind of microplate reader micro-signal treatment circuit | |
| CN206331026U (en) | Anode current sampling circuit | |
| CN203313130U (en) | Sensitive infrared amplifying circuit | |
| CN206422692U (en) | It is a kind of to produce the power circuit of plurality of voltages | |
| CN204669241U (en) | A kind of current transducer circuit | |
| CN104601120A (en) | Audio power amplifier with small degree of distortion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Xuchang City, Henan province 461000 China Electric Valley XJ Group New Energy Industrial Park Patentee after: Xuchang smart relay Limited by Share Ltd Address before: Xuchang City, Henan province 461000 China Electric Valley XJ Group New Energy Industrial Park Patentee before: The Henan intelligent Science and Technology Co., Ltd. that permitted to continue |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160706 Termination date: 20190219 |