CN106325350A - DC/DC converter output voltage control circuit - Google Patents
DC/DC converter output voltage control circuit Download PDFInfo
- Publication number
- CN106325350A CN106325350A CN201610867102.2A CN201610867102A CN106325350A CN 106325350 A CN106325350 A CN 106325350A CN 201610867102 A CN201610867102 A CN 201610867102A CN 106325350 A CN106325350 A CN 106325350A
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- China
- Prior art keywords
- circuit
- output voltage
- input
- digital
- outfan
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a DC/DC converter output voltage control circuit which comprises a rectification filter circuit, an operational amplification circuit, a photoelectric coupler N3 and a digital-to-analogue conversion circuit. The output end of the rectification filter circuit is connected with the input end of the operational amplification circuit, the output end of the operational amplification circuit is connected with the input end of the photoelectric coupler N3, the input end of the digital-to-analogue conversion circuit is a digital signal input end, and the output end of the digital-to-analogue conversion circuit is connected with the input end of the operational amplification circuit. According to the voltage control circuit, digital signals are input from the outside of the circuit, the output voltage of a DC/DC converter is controlled to change in proportion, and the aim of controlling the output voltage of the DC/DC converter through the digital signals is achieved.
Description
Technical field
The present invention relates to a kind of voltage control circuit, be specifically related to a kind of DC/DC changer output voltage controlling circuit.
Background technology
DC/DC changer is widely used in various electronic equipment as power supply.Some specific electronic equipments are wanted
Seek the voltage variable of power supply, but owing to DC/DC changer itself uses electric resistance partial pressure to sample, and compare with reference voltage
Mode carrys out stablizing of output voltage, therefore changes output voltage and mainly uses the mode from parallel connection outside resistance, is only capable of realizing letter
Single output voltage control, and non-essential resistance once it is determined that, the output voltage of DC/DC changer is fixed the most therewith, it is impossible to carry out
Secondary is changed.
Summary of the invention
It is an object of the invention to provide a kind of DC/DC changer output voltage controlling circuit, can be by from circuit
Portion's supplied with digital signal, controls the output voltage of DC/DC changer, thus realizes controlling the function of output voltage change.
For achieving the above object, present invention employs techniques below scheme:
A kind of DC/DC changer output voltage controlling circuit, including current rectifying and wave filtering circuit, operational amplification circuit, light thermocouple
Clutch N3 and D/A converting circuit, the outfan of described current rectifying and wave filtering circuit is connected with the input of operational amplification circuit, computing
The outfan of amplifying circuit is connected with the input of photoelectrical coupler N3, and the input of analog-digital conversion circuit as described is digital signal
Input, its outfan is connected with the input of operational amplification circuit.
Described operational amplification circuit includes operational amplifier N2, resistance R1 and resistance R2, and described operational amplifier N2's is same
Phase input is connected with analog to digital conversion circuit, and the inverting input of operational amplifier N2 is defeated through resistance R1 and current rectifying and wave filtering circuit
Going out end to be connected, this inverting input through resistance R2 ground connection, the outfan of operational amplifier N2 is connected with photoelectrical coupler N3.
Described D/A converting circuit uses analog-digital chip N1.
The model of described analog-digital chip N1 is AD558.
As shown from the above technical solution, the DC/DC changer output voltage controlling circuit that this sends out described, by outside circuit
Portion's supplied with digital signal, controls the change that the output voltage of DC/DC changer is proportional, thus reaches to use Digital Signals
The purpose of DC/DC changer output voltage.This circuit is simple, easy to adjust, can realize DC/DC changer output voltage big
Little regulation.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the present invention；
Fig. 2 is the DC/DC changer output voltage of the present invention change oscillogram by Digital Signals.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings:
As it is shown in figure 1, the DC/DC changer output voltage controlling circuit of the present embodiment, including current rectifying and wave filtering circuit 1, fortune
Calculate amplifying circuit 2, photoelectrical coupler N3 and D/A converting circuit, the outfan of current rectifying and wave filtering circuit 1 and operational amplification circuit 2
Input is connected, and the outfan of operational amplification circuit 2 is connected with the input of photoelectrical coupler N3, the input of analog to digital conversion circuit
End is digital signal input end, and its outfan is connected with the input of operational amplification circuit 2.
As it is shown in figure 1, this operational amplification circuit 2 includes operational amplifier N2, resistance R1 and resistance R2, operational amplifier N2
In-phase input end be connected with analog to digital conversion circuit, the inverting input of operational amplifier N2 is through resistance R1 and current rectifying and wave filtering circuit
The outfan of 1 is connected, this inverting input through resistance R2 ground connection, the outfan of operational amplifier N2 and photoelectrical coupler N3 phase
Even.D/A converting circuit uses analog-digital chip N1, and in the present embodiment, the model of this analog-digital chip N1 is AD558.
Operation principle: digital signal codes sequentially inputs the D0-D7 pin of Fig. 1 chips N1, and operational amplifier N2 is defeated
Go out the voltage feedback reference voltage as DC/DC changer of correspondence, thus the output controlling DC/DC changer keeps corresponding
Voltage, As time goes on, digital signal codes changes, and drives the voltage of chip N1 to change, and controls DC/DC conversion
The change that the output voltage of device is proportional, thus reach to use the purpose of Digital Signals DC/DC changer output voltage.
Table 1
As shown in table 1, the D0-D7 pin of 8 position digital signal input chip N1 in table 1, its operational amplifier N2 exports
Corresponding voltage is as shown in table 1, and this voltage is as the feedback reference voltage of DC/DC changer, thus controls DC/DC changer
Output keeps corresponding voltage.Fig. 2 is the ripple that DC/DC changer output voltage changes with the change of table 2 digital signal codes
Shape figure.
Embodiment described above is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (4)
1. a DC/DC changer output voltage controlling circuit, it is characterised in that: include current rectifying and wave filtering circuit (1), operation amplifier
Circuit (2), photoelectrical coupler N3 and D/A converting circuit, the outfan of described current rectifying and wave filtering circuit (1) and operational amplification circuit
(2) input is connected, and the outfan of operational amplification circuit (2) is connected with the input of photoelectrical coupler N3, and described modulus turns
The input changing circuit is digital signal input end, and its outfan is connected with the input of operational amplification circuit (2).
DC/DC changer output voltage controlling circuit the most according to claim 1, it is characterised in that: described operation amplifier
Circuit (2) includes operational amplifier N2, resistance R1 and resistance R2, the in-phase input end of described operational amplifier N2 and analog digital conversion
Circuit is connected, and the inverting input of operational amplifier N2 is connected through the outfan of resistance R1 with current rectifying and wave filtering circuit (1), and this is anti-phase
Input through resistance R2 ground connection, the outfan of operational amplifier N2 is connected with photoelectrical coupler N3.
DC/DC changer output voltage controlling circuit the most according to claim 1, it is characterised in that: described digital-to-analogue conversion
Circuit uses analog-digital chip N1.
DC/DC changer output voltage controlling circuit the most according to claim 3, it is characterised in that: described digital-to-analogue conversion
The model of chip N1 is AD558.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867102.2A CN106325350A (en) | 2016-09-29 | 2016-09-29 | DC/DC converter output voltage control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867102.2A CN106325350A (en) | 2016-09-29 | 2016-09-29 | DC/DC converter output voltage control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106325350A true CN106325350A (en) | 2017-01-11 |
Family
ID=57820685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610867102.2A Pending CN106325350A (en) | 2016-09-29 | 2016-09-29 | DC/DC converter output voltage control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106325350A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275831A (en) * | 1999-05-26 | 2000-12-06 | 松下电器产业株式会社 | Converter circuit |
| JP2007166865A (en) * | 2005-12-16 | 2007-06-28 | Nagasaki Univ | Switching power supply circuit |
| CN101741233A (en) * | 2009-11-16 | 2010-06-16 | 无锡芯朋微电子有限公司 | DC-DC switch power soft-start circuit of digital-to-analogue conversion control |
| CN201600610U (en) * | 2010-01-18 | 2010-10-06 | 安徽工程科技学院 | Numerical control direct current source |
| CN104300779A (en) * | 2014-10-21 | 2015-01-21 | 陕西华经微电子股份有限公司 | DC/DC converter with output voltage and regulating voltage meeting equation y=kx+b |
| CN204302845U (en) * | 2015-01-04 | 2015-04-29 | 浙江师范大学 | A kind of simple nc adjustable DC power supply |
| CN105116950A (en) * | 2015-09-29 | 2015-12-02 | 广西职业技术学院 | High-efficiency and low-ripple numerical control DC voltage stabilizing power source |
| CN105224011A (en) * | 2015-10-13 | 2016-01-06 | 中国兵器工业集团第二一四研究所苏州研发中心 | There is the rearrangeable switch constant voltage power supply circuit of digital set-up function |
-
2016
- 2016-09-29 CN CN201610867102.2A patent/CN106325350A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275831A (en) * | 1999-05-26 | 2000-12-06 | 松下电器产业株式会社 | Converter circuit |
| JP2007166865A (en) * | 2005-12-16 | 2007-06-28 | Nagasaki Univ | Switching power supply circuit |
| CN101741233A (en) * | 2009-11-16 | 2010-06-16 | 无锡芯朋微电子有限公司 | DC-DC switch power soft-start circuit of digital-to-analogue conversion control |
| CN201600610U (en) * | 2010-01-18 | 2010-10-06 | 安徽工程科技学院 | Numerical control direct current source |
| CN104300779A (en) * | 2014-10-21 | 2015-01-21 | 陕西华经微电子股份有限公司 | DC/DC converter with output voltage and regulating voltage meeting equation y=kx+b |
| CN204302845U (en) * | 2015-01-04 | 2015-04-29 | 浙江师范大学 | A kind of simple nc adjustable DC power supply |
| CN105116950A (en) * | 2015-09-29 | 2015-12-02 | 广西职业技术学院 | High-efficiency and low-ripple numerical control DC voltage stabilizing power source |
| CN105224011A (en) * | 2015-10-13 | 2016-01-06 | 中国兵器工业集团第二一四研究所苏州研发中心 | There is the rearrangeable switch constant voltage power supply circuit of digital set-up function |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170111 |
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| RJ01 | Rejection of invention patent application after publication |