CN102299625A - Switch power supply constant current voltage limiting feedback apparatus - Google Patents
Switch power supply constant current voltage limiting feedback apparatus Download PDFInfo
- Publication number
- CN102299625A CN102299625A CN2011101825050A CN201110182505A CN102299625A CN 102299625 A CN102299625 A CN 102299625A CN 2011101825050 A CN2011101825050 A CN 2011101825050A CN 201110182505 A CN201110182505 A CN 201110182505A CN 102299625 A CN102299625 A CN 102299625A
- Authority
- CN
- China
- Prior art keywords
- feedback
- voltage
- power supply
- constant current
- control
- 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.)
- Pending
Links
Images
Abstract
The invention relates to a switch power supply constant current voltage limiting feedback apparatus, and belongs to the switch power supply feedback control technical field. The apparatus in the invention comprises the following parts: a sampling circuit used for converting work current into a voltage signal and outputting the voltage signal to a control feedback circuit; the control feedback circuit used for comparing and amplifying the voltage signal inputted by the sampling circuit to obtain a feedback signal, and outputting the feedback signal to a control chip through an isolator; a voltage limiting circuit used for controlling output voltage in a predetermined range according to the feedback signal. Compared with a present special-purpose constant current chip control scheme, 15% or more energy is saved by utilizing the apparatus in the invention. According to the invention, precision of output current can reach 1%, and the apparatus can be adjusted according to output load voltage requirement.
Description
Technical field
The present invention relates to a kind of Switching Power Supply constant current pressure limiting feedback device, belong to Switching Power Supply feedback control technology field.
Background technology
Along with the high speed development of modern industrial technology, the power requirement that Switching Power Supply is provided is more and more higher, and special Global Greenhouse Effect constantly worsens, and people more and more pay attention to energy-saving and emission-reduction.The LED lighting energy saving will incorporate in people's the life, and the generation of LED energy-saving lighting lamp has promoted the development of constant current switch power supply.How solving the constant current problem has become the direction that each control chip manufacturer makes great efforts, but the chip solution of nowadays releasing all exists problems such as the raising of a cost, precision are not high, circuit complexity.
Summary of the invention
The invention provides that a kind of cost is low, control precision is high, the simple Switching Power Supply constant current of circuit structure pressure limiting feedback device.
The objective of the invention is to be achieved through the following technical solutions:
A kind of Switching Power Supply constant current pressure limiting feedback device comprises:
Sample circuit is used for operating current is converted to voltage signal, and described voltage signal is exported to the Control and Feedback circuit;
The Control and Feedback circuit is used for the voltage signal that current sampling circuit is imported being compared and amplifying the acquisition feedback signal, and described feedback signal is exported to control chip by isolator;
The volt circuit of rationing the power supply is used for according to feedback signal output voltage being controlled in the preset range.
By the above-mentioned technical scheme that provides as can be seen, the present invention has following characteristics: save 〉=15% than existing special-purpose constant current chip controls scheme; The precision of output current can reach 1%; Can regulate according to the output loading voltage request.
Description of drawings
The structural representation of the Switching Power Supply constant current pressure limiting feedback device that Fig. 1 provides for the specific embodiment of the present invention;
The principle schematic of the Switching Power Supply constant current pressure limiting feedback device that Fig. 2 provides for the specific embodiment of the present invention;
The electrical block diagram of the Switching Power Supply constant current pressure limiting feedback device that Fig. 3 provides for the specific embodiment of the present invention.
Embodiment
This embodiment provides a kind of Switching Power Supply constant current pressure limiting feedback device, as shown in Figure 1, comprising:
Control and Feedback circuit 2 is used for the voltage signal that current sampling circuit 1 is imported being compared and amplifying the acquisition feedback signal, and described feedback signal is exported to control chip by isolator;
The volt circuit 3 of rationing the power supply is used for according to feedback signal output voltage being controlled in the preset range.
The operation principle of this embodiment is (feedback module circuit) as shown in Figure 2.Be divided into two kinds of constant voltage and constant currents according to the load characteristic Switching Power Supply, and this embodiment is the constant current switch power supply.Wherein, RL is " Constant Current Load module " and LED+ among Fig. 3 and the load between the LED-among Fig. 2; Io is a Switching Power Supply output constant current; Uz is the voltage of voltage regulation value that voltage stabilizing gets Z;
The concrete enforcement of this embodiment is as follows:
When " Constant Current Load module " among Fig. 2 connected, LED+ voltage was over the ground slowly set up after the Switching Power Supply work.The sample circuit 1 that output current flows through among " Constant Current Load module ", Fig. 3 arrives ground, and at this moment the sampling resistor R7 two ends in the sample circuit 1 form pressure drop (being Ua＞0).At this moment Ua rises to set point by 0.
Constant current implementation procedure: when the increase of Io surpasses the constant current set point.The Ua level is raised and is made Ub voltage improve, and Ub feeds back to the 1st pin of U1.When U1 detected 1 pin voltage and raises, the electric current that flows through 2,3 pin increased.The elementary time light-emitting diodes of O1 this moment is in control big electric current, and O1 time grade makes the change in voltage of secondary CE two ends by photoelectricity transmission.The variation of this voltage feeds back to " PWM control module " (being the Control and Feedback circuit 2 among Fig. 3) among Fig. 2, " PWM control module " drive waveforms that output duty cycle is littler is come the elementary conversion efficiency of control switching, to reach the reduction output current, realize the constant current effect.
The constant voltage implementation procedure: when switch power source output voltage began slowly to set up, Uc produced a constant voltage.This magnitude of voltage can draw according to the TL431 characteristic, and Uc=(1+R5/ (R4+R7)) the wherein value of R7 can ignore.Carry the big electric current of constant load because on R7, add, consider that its value of problem of the own power of resistance is taken as 1/10 of R4.When output voltage is higher than Uc, flows through the elementary electric current of O1 and increase.Thereby O1 time and the variation of a voltage, it is identical with the constant current implementation procedure to regulate implementation procedure; When " Constant Current Load module " connected when load disconnects, the voltage 0V of Ua, Ub voltage descended from 2.5.U1 detects falling of Ub voltage, feeds back to " PWM control module " by O1 and makes the raising of output voltage.When output voltage 〉=Ud+Uz, Uz by electric current through R8, U2 to R7.Make the level of Ua improve, thereby enter constant current implementation procedure control model.
This embodiment can satisfy the needs of external loading in the process that realizes constant current output control output voltage scope effectively.The technical scheme that adopts this embodiment to provide saves 〉=15% than existing special-purpose constant current chip controls scheme; The precision of output current can reach 1%; Can regulate according to the output loading voltage request.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (1)
1. a Switching Power Supply constant current pressure limiting feedback device is characterized in that, comprising:
Sample circuit is used for operating current is converted to voltage signal, and described voltage signal is exported to the Control and Feedback circuit;
The Control and Feedback circuit is used for the voltage signal that current sampling circuit is imported being compared and amplifying the acquisition feedback signal, and described feedback signal is exported to control chip by isolator;
The volt circuit of rationing the power supply is used for according to feedback signal output voltage being controlled in the preset range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101825050A CN102299625A (en) | 2011-06-30 | 2011-06-30 | Switch power supply constant current voltage limiting feedback apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101825050A CN102299625A (en) | 2011-06-30 | 2011-06-30 | Switch power supply constant current voltage limiting feedback apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102299625A true CN102299625A (en) | 2011-12-28 |
Family
ID=45359851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101825050A Pending CN102299625A (en) | 2011-06-30 | 2011-06-30 | Switch power supply constant current voltage limiting feedback apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102299625A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829079A (en) * | 2005-02-28 | 2006-09-06 | 株式会社瑞萨科技 | Electronics parts for high frequency power amplifier |
| CN101754537A (en) * | 2010-02-02 | 2010-06-23 | 大连九久光电制造有限公司 | Driving power supply for high-power LED street lamp |
| US7872481B1 (en) * | 2008-05-01 | 2011-01-18 | Keithley Instruments, Inc. | Low glitch multiple form C summing node switcher |
| CN201718084U (en) * | 2010-05-12 | 2011-01-19 | 深圳桑达国际电子器件有限公司 | Circuit for driving LED to emit light and LED light-emitting device |
-
2011
- 2011-06-30 CN CN2011101825050A patent/CN102299625A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829079A (en) * | 2005-02-28 | 2006-09-06 | 株式会社瑞萨科技 | Electronics parts for high frequency power amplifier |
| US7872481B1 (en) * | 2008-05-01 | 2011-01-18 | Keithley Instruments, Inc. | Low glitch multiple form C summing node switcher |
| CN101754537A (en) * | 2010-02-02 | 2010-06-23 | 大连九久光电制造有限公司 | Driving power supply for high-power LED street lamp |
| CN201718084U (en) * | 2010-05-12 | 2011-01-19 | 深圳桑达国际电子器件有限公司 | Circuit for driving LED to emit light and LED light-emitting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104427699B (en) | LED signal lamp and its LED drive circuit | |
| CN102238766A (en) | General high-efficiency long-life driving circuit for wide voltage non-inductance semiconductor illumination | |
| CN203761633U (en) | Energy-saving LED traffic light with long service life | |
| CN203523119U (en) | Triode-based LED current ripple elimination drive circuit | |
| CN103152939A (en) | Four-in-one light-dimming circuit of light-emitting diode (LED) power source | |
| CN203199848U (en) | Energy feedback type solar elevator | |
| CN103596327A (en) | Non-isolated LED driving circuit | |
| CN102791063A (en) | Intelligent LED module with function of automatic voltage regulation | |
| CN203327322U (en) | Power self-compensation device of LED light fixture | |
| CN202495761U (en) | Capacitor constant power discharge circuit | |
| CN202353481U (en) | Numerical control DC (Direct Current) power supply | |
| CN102709021B (en) | Control circuit for electromagnet and electromagnetic valve | |
| CN205212707U (en) | Realize positive and negative high voltage output's of multichannel circuit | |
| CN102299625A (en) | Switch power supply constant current voltage limiting feedback apparatus | |
| CN202857051U (en) | Novel LED lamp drive device | |
| CN103701306A (en) | Energy-saving driving circuit device and design method | |
| CN203072219U (en) | LED driving power supply | |
| CN203523105U (en) | Under-voltage protection circuit for LED lamp | |
| CN214014109U (en) | Positive and negative output enable switching circuit | |
| CN203301829U (en) | LED lighting drive circuit | |
| CN203632906U (en) | Silicon controlled rectifier-dimming LED driving switching power supply circuit | |
| CN202059619U (en) | Dimmable LED driving power supply | |
| CN202873147U (en) | Driving power supply of constant-light LED street lamp | |
| CN203336445U (en) | Intelligent photovoltaic LED lighting device | |
| CN203554726U (en) | Multiplexed voltage output LED (Light Emitting Diode) driving power supply of feedback regulation frequency system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111228 |