CN106253676A - A kind of constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic - Google Patents
A kind of constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic Download PDFInfo
- Publication number
- CN106253676A CN106253676A CN201610622910.2A CN201610622910A CN106253676A CN 106253676 A CN106253676 A CN 106253676A CN 201610622910 A CN201610622910 A CN 201610622910A CN 106253676 A CN106253676 A CN 106253676A
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- China
- Prior art keywords
- constant
- current
- output
- power supply
- pressure type
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Abstract
The present invention provides a kind of constant-pressure type Switching Power Supply to realize the control line line structure of constant current output characteristic, this line construction includes an output current sample circuit coupled with output loop, one current signal amplifying circuit coupled with output current sample circuit, one regulates, with current signal amplifying circuit and constant-pressure type switch power source output voltage, the degenerative error amplifying circuit that port couples, it is characterized in that, above-mentioned current sample circuit, current signal amplifying circuit, outside being respectively positioned on constant-pressure type Switching Power Supply body with secondary feedback error amplifying circuit, the existing control to output electric current of output voltage adjustable side cause for gossip provided by constant-pressure type Switching Power Supply.This line construction makes constant-pressure type Switching Power Supplies numerous on market can realize the current constant control to output by simple external circuit, thus saves the time of design constant current output power supply, cost and risk, the power supply plan provided convenience for Constant Current Load.
Description
Technical field
The present invention relates to Switching Power Supply application, particularly relate to that a kind of to realize constant current for constant-pressure type Switching Power Supply defeated
The control line line structure gone out.
Background technology
Switching Power Supply is requisite critical component in contemporary electronic systems.The effect of Switching Power Supply is input voltage
It is for conversion into the output voltage meeting load request.The output voltage of Switching Power Supply is generally inner setting or by outside by hard
Part or software set up an office.When input voltage or load change, the output voltage of Switching Power Supply is by its internal control
Output voltage is controlled by device by means such as feedback, feedforwards, it is ensured that output voltage is all the time in the range of load request.Defeated
Go out voltage typically by a voltage regulated port, output voltage to be carried out within the specific limits near its set point
Adjust with the requirement meeting system.
General Switching Power Supply uses output voltage negative feedback control pattern mostly, it is provided that a constant voltage, i.e. permanent
Die mould Switching Power Supply.Constant-pressure type Switching Power Supply cannot use as constant-current source, and in the recent period along with emerging skills such as LED, battery chargings
The fast development of art, rises day by day to the demand of the Switching Power Supply of constant-current source；Moreover, constant-current source is permissible without parallel line
The most in parallel, powerful Switching Power Supply is widely used.
The present invention is directed to traditional switch power supply structure and lack the weak link of constant current ability, propose a kind of constant-pressure type switch electricity
Source realizes the control line line structure of constant current output characteristic.
Summary of the invention
Technical problem solved by the invention is to provide a kind of constant-pressure type Switching Power Supply and realizes the control of constant current output characteristic
Line construction.
The present invention solves above-mentioned technical problem, and to be the technical scheme is that a kind of constant-pressure type Switching Power Supply realizes constant current defeated
Going out the control line line structure of characteristic, this line construction includes an output current sample circuit coupled with output loop, one
The current signal amplifying circuit coupled with output current sample circuit, an output voltage with current signal amplifying circuit and base
Quasi-difference in voltage as input degenerative error amplifying circuit, and one with degenerative error amplifying circuit output voltage phase coupling
The constant-pressure type switch power source output voltage regulation port closed, it is characterised in that above-mentioned current sample circuit, current signal amplifies line
Road, and degenerative error amplifying circuit is respectively positioned on outside constant-pressure type Switching Power Supply body, is provided by constant-pressure type Switching Power Supply
The existing control to output electric current of output voltage adjustable side cause for gossip.
Preferably, above-mentioned constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic, it is characterised in that defeated
Go out the employing of current sample circuit and be connected on the current sense resistor in constant-pressure type Switching Power Supply output loop.
Preferably, above-mentioned constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic, it is characterised in that electricity
The negative voltage signal produced on above-mentioned detection resistance is amplified by stream signal amplifying circuit by operational amplifier, is just producing one
Than in the voltage signal of output electric current.
Preferably, above-mentioned constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic, it is characterised in that negative
Feedback error amplifying circuit is made up of operational amplifier, and the positive input terminal of operational amplifier is connected to a reference voltage, computing
The negative input end of amplifier couples with the output of current signal amplifying circuit, operational amplifier in degenerative error amplifying circuit
Outfan, to the tandem compound that feedback branch is resistance, electric capacity, or resistance and electric capacity of its negative input end, is constituted error originated from input
The amplification of signal.
Accompanying drawing explanation
Fig. 1 is the conspectus that constant-pressure type Switching Power Supply realizes constant current output characteristic.
Detailed description of the invention
Provide preferably one embodiment of the present invention below in conjunction with the accompanying drawings, to describe technical scheme in detail.
The present invention provides a kind of easy realization, the constant-pressure type Switching Power Supply of low cost realizes the control circuit of constant current output characteristic
Structure.Circuit of implementing in Fig. 1 comprises the electricity being made up of the resistance Rsen being connected on constant-pressure type switched power output loop
Stream detection circuit 10, comprises the current signal amplifying circuit 20 being combined composition by R4, R5, R6, C2 and amplifier EA1, comprises error
The degenerative error amplifying circuit 30 that amplifier EA2 and C1, R2 are constituted, comprises the circuit 40 of reference voltage Ref, and comprise R1 with
The impedance matching circuit 50 that D1 is constituted.
The current sampling signal on Rsen in current sample circuit 10 is the least, needs by signal amplifying circuit
20 are amplified, and current sampling signal enters the negative input end of amplifier EA1 through R5, and Rsen other end signal is then entered by R4
Entering the positive input terminal of amplifier EA1, R6 and C2 determines static and dynamic amplification, and the output voltage Vcs of amplifier EA1 is for passing through
Current sampling signal after amplification.
Vsen=Iout*Rsen,
Vcs=R6*Iout*Rsen/R5,
Vcs enters the negative input end of error amplifier EA2 by R3, compares with the reference voltage Ref of circuit 40, and with
C1, R2 constitute degenerative error amplifier-chain 30 together, and its output Vadj is the output pressure regulation signal of constant-pressure type Switching Power Supply.
Pressure regulation signal Vadj is adjusted by the output voltage of the impedance matching circuit 50 being made up of diode D1 and resistance R1 and Switching Power Supply
Whole pin is connected, and is adjusted output voltage.Before output electric current is not reaching to command value, Vadj is high level, two poles
Pipe D1 reverse bias, is not turned on, so Vadj does not play Accommodation, Switching Power Supply is output as its original constant-voltage characteristic.When
When output electric current is only slight beyond setting value, the output Vadj of error amplifier EA2 declines, drop-down by diode D1 and resistance R1
The output of constant-pressure type Switching Power Supply adjusts pin, makes module output voltage decline, and keeping output electric current is the value set, it is achieved defeated
The constant-current characteristics gone out.
Concrete constant output current point calculates and can be obtained by formula below: during Vcs=Ref, and module forms closed loop, therefore
Iout=Ref*R5/(R6*Rsen).
Although the foregoing describe the present invention is embodied as case, it will be appreciated by those of skill in the art that these
It is merely illustrative of, on the premise of without departing substantially from the principle of the present invention and essence, these case study on implementation can be made multiple change
More or amendment.
Claims (4)
1. constant-pressure type Switching Power Supply realizes a control line line structure for constant current output characteristic, and this line construction includes one with defeated
Go out the output current sample circuit of return circuit coupling, a current signal amplifying circuit coupled with output current sample circuit, one
The individual output voltage of current signal amplifying circuit and the difference of reference voltage as the degenerative error amplifying circuit of input, and one
The individual constant-pressure type switch power source output voltage regulation port being coupled with degenerative error amplifying circuit output voltage, its feature exists
It is respectively positioned on constant-pressure type Switching Power Supply in, above-mentioned current sample circuit, current signal amplifying circuit, and degenerative error amplifying circuit
Outside body, the existing control to output electric current of output voltage adjustable side cause for gossip provided by constant-pressure type Switching Power Supply.
2. this line construction a kind of constant-pressure type Switching Power Supply as claimed in claim 1 realizes the control circuit of constant current output characteristic
Structure, it is characterised in that output current sample circuit uses and is connected on the current detecting in constant-pressure type Switching Power Supply output loop
Resistance.
A kind of constant-pressure type Switching Power Supply the most as claimed in claim 1 realizes the control line line structure of constant current output characteristic, and it is special
Levying and be, the negative voltage signal that above-mentioned detection resistance produces is amplified by current signal amplifying circuit by operational amplifier,
Produce a voltage signal being proportional to export electric current.
A kind of constant-pressure type Switching Power Supply the most as claimed in claim 1 realizes the control line line structure of constant current output characteristic, and it is special
Levying and be, degenerative error amplifying circuit is made up of operational amplifier, and the positive input terminal of operational amplifier is connected to a benchmark
Voltage, the negative input end of operational amplifier couples with the output of current signal amplifying circuit, transports in degenerative error amplifying circuit
Calculate the outfan connection in series-parallel that feedback branch is resistance, electric capacity, or resistance and the electric capacity combination to its negative input end of amplifier, structure
The amplification of input error signal in pairs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610622910.2A CN106253676A (en) | 2016-08-02 | 2016-08-02 | A kind of constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610622910.2A CN106253676A (en) | 2016-08-02 | 2016-08-02 | A kind of constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106253676A true CN106253676A (en) | 2016-12-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610622910.2A Pending CN106253676A (en) | 2016-08-02 | 2016-08-02 | A kind of constant-pressure type Switching Power Supply realizes the control line line structure of constant current output characteristic |
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| CN (1) | CN106253676A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459650A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | Constant voltage control loop and electronic load |
| CN110231846A (en) * | 2019-06-10 | 2019-09-13 | 西安微电子技术研究所 | A kind of power module feedback control circuit difunctional with constant current and constant pressure |
| US11469617B2 (en) | 2018-02-21 | 2022-10-11 | Nuvolta Technologies (Hefei) Co., Ltd. | Hybrid control apparatus and method |
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| CN2938554Y (en) * | 2006-08-29 | 2007-08-22 | Bcd半导体制造有限公司 | Switch mode power supply and its overvoltage protection circuit |
| CN101662210A (en) * | 2009-09-29 | 2010-03-03 | 上海导向微电子有限公司 | Constant current constant voltage power controller and encapsulation and supply converter thereof |
| CN104852587A (en) * | 2015-06-03 | 2015-08-19 | 矽力杰半导体技术(杭州)有限公司 | Switching converter |
| CN205304593U (en) * | 2016-01-08 | 2016-06-08 | 成都市宏山科技有限公司 | Steady voltage loop circuit |
| CN205945520U (en) * | 2016-08-02 | 2017-02-08 | 江苏兆能电子有限公司 | Constant voltage type switching power supply realizes constant current output characteristic's control scheme structure |
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2016
- 2016-08-02 CN CN201610622910.2A patent/CN106253676A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2938554Y (en) * | 2006-08-29 | 2007-08-22 | Bcd半导体制造有限公司 | Switch mode power supply and its overvoltage protection circuit |
| CN101662210A (en) * | 2009-09-29 | 2010-03-03 | 上海导向微电子有限公司 | Constant current constant voltage power controller and encapsulation and supply converter thereof |
| CN104852587A (en) * | 2015-06-03 | 2015-08-19 | 矽力杰半导体技术(杭州)有限公司 | Switching converter |
| CN205304593U (en) * | 2016-01-08 | 2016-06-08 | 成都市宏山科技有限公司 | Steady voltage loop circuit |
| CN205945520U (en) * | 2016-08-02 | 2017-02-08 | 江苏兆能电子有限公司 | Constant voltage type switching power supply realizes constant current output characteristic's control scheme structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459650A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | Constant voltage control loop and electronic load |
| CN108459650B (en) * | 2017-02-22 | 2023-09-12 | 普源精电科技股份有限公司 | Constant voltage control loop and electronic load |
| US11469617B2 (en) | 2018-02-21 | 2022-10-11 | Nuvolta Technologies (Hefei) Co., Ltd. | Hybrid control apparatus and method |
| CN110231846A (en) * | 2019-06-10 | 2019-09-13 | 西安微电子技术研究所 | A kind of power module feedback control circuit difunctional with constant current and constant pressure |
| CN110231846B (en) * | 2019-06-10 | 2021-02-09 | 西安微电子技术研究所 | Power module feedback control circuit with constant current and constant voltage dual functions |
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Application publication date: 20161221 |