CN208636684U - A kind of circuit being applicable in DDC controller simulation output interface - Google Patents
A kind of circuit being applicable in DDC controller simulation output interface Download PDFInfo
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- CN208636684U CN208636684U CN201821283714.8U CN201821283714U CN208636684U CN 208636684 U CN208636684 U CN 208636684U CN 201821283714 U CN201821283714 U CN 201821283714U CN 208636684 U CN208636684 U CN 208636684U
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Abstract
The utility model relates to a kind of circuit for being applicable in DDC controller simulation output interface, the circuit includes single-chip minimum system, howland circuit and NPN type triode equipped with DAC D/A converting circuit；The single-chip minimum system and the collector of NPN type triode are connect with respective DC power supply respectively；The howland circuit is connect with DAC D/A converting circuit, NPN type triode and the control interface of single-chip minimum system respectively；The control interface is the interface connecting with the simulation output interface；Technical solution provided by the utility model is convenient to design the DDC simulation output interface circuit of user demand, and device is few, control is simple, development cost is low.
Description
Technical field
The utility model belongs to the Technology design field of the port DDC controller I/O, and in particular to a kind of applicable DDC control
The circuit of device simulation output interface.
Background technique
With the development of intelligent control technology, the application field of DDC controller is more and more extensive, such as building automation, center
The AO simulation output interface of the industries such as airconditioning control, industrial automatic control, usual DDC controller is all to have dedicated devices to do,
It is at high cost, and single-chip microcontroller and special chip need special communication protocol, development difficulty is high, therefore research and development device is few, control
The circuit that system is simple, development cost is low has a very important significance.
Utility model content
A kind of circuit being applicable in DDC controller simulation output interface provided by the utility model, the purpose is to easily set
Count out the DDC simulation output interface circuit of user demand.
The purpose of this utility model adopts the following technical solutions realization:
A kind of circuit being applicable in DDC controller simulation output interface, it is improved in that the circuit includes being equipped with
Single-chip minimum system, howland circuit and the NPN type triode of DAC D/A converting circuit；
The single-chip minimum system and the collector of NPN type triode are connect with respective DC power supply respectively；
The howland circuit respectively with DAC D/A converting circuit, NPN type triode and the control of single-chip minimum system
Interface connection processed；
The control interface is the interface connecting with the simulation output interface.
Preferably, the howland circuit includes operational amplifier, non-inverting input terminal resistance, inverting input terminal resistance, just
Feedback resistance, negative feedback resistor and sample resistance；
One end of the non-inverting input terminal resistance is connect with the DAC D/A converting circuit of the single-chip minimum system, separately
One end is connect with the non-inverting input terminal of the operational amplifier；
One end of the inverting input terminal resistance is grounded, and the other end is connect with the inverting input terminal of the operational amplifier；
Tie point and the negative-feedback between the inverting input terminal resistance and the inverting input terminal of the operational amplifier
One end of resistance connects, and the other end of the negative feedback resistor is connect with one end of the sample resistance, the sample resistance
The other end is connect with control interface；
Tie point between the non-inverting input terminal resistance and the non-inverting input terminal of the operational amplifier passes through positive and negative feed
Resistance and the tie point connection between sample resistance and control interface；
The output end of the operational amplifier and the base stage of NPN type triode connect；
Tie point connection between the emitter of NPN type triode and the negative feedback resistor and sample resistance.
Further, the model ADA4096-2ARM of the operational amplifier.
Preferably, the control interface is current-mode control interface or voltage mode control interface.
Preferably, if the control interface is voltage mode control interface, in voltage mode control interface and connecting resistance.
Compared with the immediate prior art, technical solution provided by the utility model is had the following beneficial effects:
Technical solution provided by the utility model, including be equipped with DAC D/A converting circuit single-chip minimum system,
Howland circuit and NPN type triode；The single-chip minimum system and the collector of NPN type triode respectively with it is respective
DC power supply connection；The howland circuit respectively with the DAC D/A converting circuit of single-chip minimum system, NPN type triode and
Control interface connection；The control interface is the interface connecting with the simulation output interface, it is convenient to which designing user needs
The DDC simulation output interface circuit asked, device is few, control is simple, development cost is low.
Detailed description of the invention
Fig. 1 is a kind of electrical block diagram for being applicable in DDC controller simulation output interface provided by the utility model；
Fig. 2 is a kind of structure for being applicable in howland circuit in DDC controller simulation output interface provided by the utility model
Schematic diagram；
Wherein, RZ non-inverting input terminal resistance, RI inverting input terminal resistance, RX positive feedback resistor, RF negative feedback resistor, RS take
Sample resistance, Vi input voltage, UC homophase input voltage, the reversed input voltage of UD, Ix positive feedback current, If negative feedback current, UA
Output voltage, UB sampling end voltage, Is load current.
Specific embodiment
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing.
A kind of circuit being applicable in DDC controller simulation output interface provided by the utility model, as shown in Figure 1, the electricity
Road includes single-chip minimum system, howland circuit and NPN type triode equipped with DAC D/A converting circuit；
The single-chip minimum system and the collector of NPN type triode are connect with respective DC power supply respectively；
The howland circuit respectively with DAC D/A converting circuit, NPN type triode and the control of single-chip minimum system
Interface connection processed；
The control interface is the interface connecting with the simulation output interface.
In the present embodiment, the single-chip minimum system includes DAC D/A converting circuit, crystal oscillating circuit and the first DC electricity
Source；Optional 8,10,12 or 16 DAC converter of the DAC D/A converting circuit are described to meet accuracy requirement
Single-chip minimum system is connect with the first DC power supply, and the collector of NPN type triode is connect with the second DC power supply；DAC digital-to-analogue turns
The voltage range for changing circuit output is 0-3.3V.
The howland circuit, as shown in Fig. 2, including operational amplifier, non-inverting input terminal resistance, inverting input terminal electricity
Resistance, positive feedback resistor, negative feedback resistor and sample resistance；
One end of the non-inverting input terminal resistance is connect with the DAC D/A converting circuit of the single-chip minimum system, separately
One end is connect with the non-inverting input terminal of the operational amplifier；
One end of the inverting input terminal resistance is grounded, and the other end is connect with the inverting input terminal of the operational amplifier；
Tie point and the negative-feedback between the inverting input terminal resistance and the inverting input terminal of the operational amplifier
One end of resistance connects, and the other end of the negative feedback resistor is connect with one end of the sample resistance, the sample resistance
The other end is connect with control interface；
Tie point between the non-inverting input terminal resistance and the non-inverting input terminal of the operational amplifier passes through positive and negative feed
Resistance and the tie point connection between sample resistance and control interface；
The output end of the operational amplifier and the base stage of NPN type triode connect；
Tie point connection between the emitter of NPN type triode and the negative feedback resistor and sample resistance.
The model ADA4096-2ARM of the operational amplifier.
The control interface is current-mode control interface or voltage mode control interface.
If the control interface is voltage mode control interface, in voltage mode control interface and connecting resistance；
In the present embodiment, circuit output signal is the electric current of 0-22mA, if external 500 Ω resistance, can be used as 0-11V electricity
The peripheral hardware of voltage-controlled system.
In a kind of circuit being applicable in DDC controller simulation output interface provided by the utility model, single-chip microcontroller connects control
Analog signal Software Coding needed for mouthful is the digital signal that single-chip microcontroller can identify, is then turned by the DAC digital-to-analogue of single-chip microcontroller
It changes circuit and converts digital signals into analog signal, then electric current letter is converted by howland current pump circuit and NPN triode
Number.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System, although the utility model is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: specific implementation of the utility model can still be modified or equivalent replacement, and practical new without departing from this
Any modification of type spirit and scope or equivalent replacement, should all cover the utility model claims it
It is interior.
Claims (5)
1. a kind of circuit for being applicable in DDC controller simulation output interface, which is characterized in that the circuit includes being equipped with DAC digital-to-analogue
Single-chip minimum system, howland circuit and the NPN type triode of conversion circuit；
The single-chip minimum system and the collector of NPN type triode are connect with respective DC power supply respectively；
The howland circuit connects with DAC D/A converting circuit, NPN type triode and the control of single-chip minimum system respectively
Mouth connection；
The control interface is the interface connecting with the simulation output interface.
2. circuit according to claim 1, which is characterized in that the howland circuit includes operational amplifier, with mutually defeated
Input resistance, inverting input terminal resistance, positive feedback resistor, negative feedback resistor and sample resistance；
One end of the non-inverting input terminal resistance is connect with the DAC D/A converting circuit of the single-chip minimum system, the other end
It is connect with the non-inverting input terminal of the operational amplifier；
One end of the inverting input terminal resistance is grounded, and the other end is connect with the inverting input terminal of the operational amplifier；
Tie point and the negative feedback resistor between the inverting input terminal resistance and the inverting input terminal of the operational amplifier
One end connection, the other end of the negative feedback resistor connect with one end of the sample resistance, the sample resistance it is another
End is connect with control interface；
Tie point between the non-inverting input terminal resistance and the non-inverting input terminal of the operational amplifier by positive feedback resistor and
Tie point connection between sample resistance and control interface；
The output end of the operational amplifier and the base stage of NPN type triode connect；
Tie point connection between the emitter of NPN type triode and the negative feedback resistor and sample resistance.
3. circuit according to claim 2, which is characterized in that the model ADA4096-2ARM of the operational amplifier.
4. circuit according to claim 1, which is characterized in that the control interface is current-mode control interface or voltage-type
Control interface.
5. circuit according to claim 1, which is characterized in that if the control interface is voltage mode control interface,
Voltage mode control interface and connecting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821283714.8U CN208636684U (en) | 2018-08-10 | 2018-08-10 | A kind of circuit being applicable in DDC controller simulation output interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821283714.8U CN208636684U (en) | 2018-08-10 | 2018-08-10 | A kind of circuit being applicable in DDC controller simulation output interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208636684U true CN208636684U (en) | 2019-03-22 |
Family
ID=65740020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821283714.8U Active CN208636684U (en) | 2018-08-10 | 2018-08-10 | A kind of circuit being applicable in DDC controller simulation output interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208636684U (en) |
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2018
- 2018-08-10 CN CN201821283714.8U patent/CN208636684U/en active Active
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Address after: 518000 11a, Xinhai building, 2329 Nanshan Avenue, Honghuayuan community, Nantou street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen aigreenland energy and Environment Technology Co., Ltd Address before: 518000 floor 6, Nangang business building, Qianhai Road, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen aigreenland energy and Environment Technology Co., Ltd |
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