CN109120159A - A kind of power circuit and power sources in parallel system - Google Patents
A kind of power circuit and power sources in parallel system Download PDFInfo
- Publication number
- CN109120159A CN109120159A CN201811213886.2A CN201811213886A CN109120159A CN 109120159 A CN109120159 A CN 109120159A CN 201811213886 A CN201811213886 A CN 201811213886A CN 109120159 A CN109120159 A CN 109120159A
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- circuit
- power
- power supply
- output
- negative terminal
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- 230000005611 electricity Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
This application discloses a kind of power circuit and power sources in parallel systems, each power supply is identical in power sources in parallel system, and the negative connection of output of the sample circuit negative terminal of each power supply and each power supply, the sample circuit negative terminal of each power supply is also connect with output ground, it is characterized by: connecting a compensation circuit between the sample circuit negative terminal and output ground of each power supply, so that just flowing out to output ground after compensation circuit of the output load current of each power supply by each power supply, when the output voltage of some power supply in power sources in parallel system is higher, band full load suddenly, the module forms a voltage difference in compensation circuit, to drag down the output voltage of the power module, to realize the stream of power sources in parallel system, device of the present invention is few, it is at low cost, it is easily designed, reliability is higher.
Description
Technical field
The present invention relates to Switching Power Supplies, the in particular to switch power supply system of multiple module paralleling.
Background technique
The development that the birth of modular power source reflects power supply industry in recent years constantly improves, and modular power source is integrated
The new direction of circuit development, is with a wide range of applications, with the needs of high power load, the research of multiple module paralleling technology
Also increasing.
Fig. 1 be existing power supply module schematic diagram, remove input circuit, main power transformer T1, master power switch pipe TR1,
It controls except chip U1 and output circuit, further includes output voltage sampling circuit, isolation feedback optocoupler OC1 and feedback control circuit
To realize the stabilization of output voltage；Wherein sample circuit includes resistance R5 and resistance R13, and resistance R5 and power module export positive
Tie point is the anode of sample circuit, and the tie point of resistance R5 and resistance R13 are the output end of sample circuit, resistance R13 and electricity
The negative tie point of source module output is the negative terminal of sample circuit；Feedback control circuit is controllable accurate source of stable pressure U2, controllable accurate
The anode of source of stable pressure U2 be feedback control circuit negative terminal, the reference extremely feedback control circuit of controllable accurate source of stable pressure U2 it is defeated
Enter end, the cathode of controllable accurate source of stable pressure U2 is the control terminal of feedback control circuit；The negative terminal and sampling electricity of feedback control circuit
The negative terminal on road is connected.
When multiple module paralleling shown in FIG. 1 in use, assuming that 2 two module one, module wired in parallel use, such as attached drawing 2
It is shown, i.e. the zero curve of the phase line end L of the phase line end formation power sources in parallel system of the phase line end link block two of module one, module one
Hold the zero line side of link block two formed the zero line side N of power sources in parallel system, module one output just with the output of module two just
The negative connection of the negative output with module two of output that connection forms the positive Vo+ of output and module one of power sources in parallel system forms electricity
The negative Vo- of the output of source parallel system, although 2 two module one, module modular circuit parameters are just the same, due to component
Difference, module one, two liang of modules of module output voltage will not be identical, the high module of output voltage will flow backward into output
The low module of voltage, if giving circuit loading at this time, the high module of output voltage will bear most of load, lead to two modules
The uneven stream of output, if adding full load to circuit at this time, since the high module of voltage preferentially provides load, leads to the module that voltage is high
Overcurrent protection is easily triggered, so that circuit can not work normally, thus by customer complaint.
Therefore, it is necessary to be improved to the prior art.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of power sources in parallel system, each electricity in realization system
Source output is flowed.
In order to solve the above technical problems, power circuit provided by the invention is realized by following technical measures:
A kind of power circuit, the negative connection of the output of the sample circuit negative terminal and power circuit of power circuit, power circuit
Sample circuit negative terminal is also connect with output ground, it is characterised in that: is connected between the sample circuit negative terminal and output ground of power circuit
A compensation circuit is connect, so that just flowing out to output after the compensation circuit that the output load current of power circuit passes through power circuit
Ground.
As a kind of specific embodiment of compensation circuit, compensation circuit is a resistance.
Preferably, the resistance value of resistance is m Ω grades to 10m Ω grades.
As another specific embodiment of compensation circuit, compensation circuit is controllable voltage source.
Accordingly, power sources in parallel system provided by the invention is realized by following technical measures:
A kind of power sources in parallel system, each power supply is identical in system, and the sample circuit negative terminal of each power supply and each power supply is defeated
Connection is born out, and the sample circuit negative terminal of each power supply is also connect with output ground, it is characterised in that: in the sample circuit negative terminal of each power supply
A compensation circuit is connected between output ground, so that just flowing after the compensation circuit that the output load current of each power supply passes through each power supply
Out to output ground.
As a kind of specific embodiment of compensation circuit, compensation circuit is a resistance.
Preferably, the resistance value of resistance is m Ω grades to 10m Ω grades.
As another specific embodiment of compensation circuit, compensation circuit is controllable voltage source.
Present invention design results from: inventor has found power sources in parallel system as used circuit shown in Fig. 1, each power supply
Sample circuit negative terminal be connected directly to output ground, after power parameter determines, the output voltage of each power supply also just it is fixed not
Become, due to the difference of component, the output voltage of each power supply will not be identical, just has the high power supply of output voltage and flows backward
The power supply low into output voltage leads to each uneven stream of power supply output, or even band full load triggers product overcurrent suddenly in each power supply
The problem of protection, therefore a compensation circuit is connected between the sample circuit negative terminal and output ground of each power supply, so that each power supply
Output load current just flows out to output ground after the compensation circuit by each power supply, when in power sources in parallel system some power supply it is defeated
Voltage is higher out, unexpected band full load, which forms a voltage difference in its compensation circuit, to drag down the defeated of the power supply
Voltage out.
Compared with prior art, the invention has the following beneficial effects:
1, in more power sources in parallel, this programme circuit is exported and is flowed between can be very good to realize power supply；
2, this programme can solve the problems, such as that more power sources in parallel band heavy-loaded circuits can not work normally；
3, for detection control circuit of the present invention compared with prior art complexity, by cleverly inventive concept, in realization
While stating 1 and 2 beneficial effect, easily realize that device is less, and cost is lower, easily designed, reliability is higher.
Detailed description of the invention
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the circuit diagram of existing power supply module；
Fig. 2 is 2 two module one, module wired in parallel schematic diagrames；
Fig. 3 is the single power circuit schematic diagram of the specific embodiment of the invention.
Specific embodiment
In order to which the present invention is more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is described in more detail.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Be illustrated in figure 3 the single power circuit schematic diagram of the specific embodiment of the invention, circuit composition it is different with Fig. 1 it
Locate as follows:
Further include: compensation circuit, the yin of controllable accurate source of stable pressure U2 in 1 available circuit of one end connection figure of compensation circuit
Pole, the output that the other end connects behind one end of resistance R13 as power module is negative, the other end connection controllable accurate of resistance R13
The reference pole of source of stable pressure U2.
Above-mentioned compensation circuit is made of the compensation resistance R23 of a very little resistance value, and the resistance value of resistance R23 is that several m Ω are arrived
Tens m Ω, and the power of modular power source output is bigger, the value of the compensation resistance is smaller.
Working principle: as shown in Fig. 3 circuit, when two same wired in parallel in use, if one of module it is defeated
Voltage is higher out, and band full load, most of electric current that is bound to preferentially flow through the higher module of output voltage suddenly, due to output electricity
Stream can flow through the compensation resistance R23 of the module, will form a bigger pressure on the compensation resistance R23 of the module at this time
Poor Δ V (flows through compensation electricity since output electric current I is far longer than voltage sample feed circuit known to output voltage sampling feedback
The electric current of R23 is hindered, therefore negligible voltage sampling circuit flows through the electric current of compensation resistance R23):
Output voltage Vo are as follows:
The output voltage of the module will reduce at this time, thus make rapidly electric current from another module stream export, avoid because
The high module of output voltage bears high current and triggers overcurrent protection, and since the introducing of compensation resistance R23 is so that two moulds
The electric current of block is finally reached balance, plays stream effect, and since the resistance value of compensation resistance R23 is especially small, the several m Ω of value
To tens m Ω, and the power of modular power source output is bigger, and the value of the compensation resistance is smaller, therefore to the output of product electricity
It presses precision to influence less, can ignore.
The implementation of the present invention is not limited to this, and above content according to the invention is known using the ordinary skill of this field
Know and customary means, under the premise of not departing from above-mentioned basic fundamental thought of the invention, specific implementation circuit can be in the present invention
The modification, replacement or change of other diversified forms are made, controllable voltage source is such as replaced into the resistance R23 in Fig. 3, utilizes controllable electric
Potential source self-characteristic formed with output the positively related pressure difference of electric current, goal of the invention also may be implemented, these modification, replacement or become
It more all falls within rights protection scope of the present invention；In addition, for a person skilled in the art, of the invention is used for parallel connection
Power circuit be not limited to Fig. 1, the feedback control circuit of example as shown in figure 1 can also be realized using the circuit that amplifier forms, right
Modification, replacement or the change of this other diversified forms made, also all fall within rights protection scope of the present invention.
Claims (8)
1. a kind of power circuit, the negative connection of the output of the sample circuit negative terminal and power circuit of power circuit, power circuit are adopted
Sample circuit negative terminal is also connect with output ground, it is characterised in that: is connected between the sample circuit negative terminal and output ground of power circuit
One compensation circuit, so that just flowing out to output ground after the compensation circuit that the output load current of power circuit passes through power circuit.
2. power circuit according to claim 1, it is characterised in that: compensation circuit is a resistance.
3. power circuit according to claim 2, it is characterised in that: the resistance value of resistance is m Ω grades to 10m Ω grades.
4. power circuit according to claim 1, it is characterised in that: compensation circuit is controllable voltage source.
5. a kind of power sources in parallel system, each power supply is identical in system, and the output of the sample circuit negative terminal of each power supply and each power supply
Negative connection, the sample circuit negative terminal of each power supply also connects with output ground, it is characterised in that: each power supply sample circuit negative terminal and
A compensation circuit is connected between output ground, so that just flowing out after the compensation circuit that the output load current of each power supply passes through each power supply
To output ground.
6. power circuit according to claim 5, it is characterised in that: compensation circuit is a resistance.
7. power circuit according to claim 6, it is characterised in that: the resistance value of resistance is m Ω grades to 10m Ω grades.
8. power circuit according to claim 5, it is characterised in that: compensation circuit is controllable voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811213886.2A CN109120159A (en) | 2018-10-16 | 2018-10-16 | A kind of power circuit and power sources in parallel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811213886.2A CN109120159A (en) | 2018-10-16 | 2018-10-16 | A kind of power circuit and power sources in parallel system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109120159A true CN109120159A (en) | 2019-01-01 |
Family
ID=64854749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811213886.2A Withdrawn CN109120159A (en) | 2018-10-16 | 2018-10-16 | A kind of power circuit and power sources in parallel system |
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| Country | Link |
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| CN (1) | CN109120159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039064A (en) * | 2020-08-31 | 2020-12-04 | 科华恒盛股份有限公司 | Control method based on power supply system and related device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06165488A (en) * | 1992-11-26 | 1994-06-10 | Fuji Electric Co Ltd | Switching power supply device |
| CN1450431A (en) * | 2003-01-13 | 2003-10-22 | 艾默生网络能源有限公司 | Compensation circuit and method for diode voltage drop of power supply output terminal |
| US20080309161A1 (en) * | 2007-06-15 | 2008-12-18 | Samsung Electronics Co., Ltd. | Multi-output power supply device |
| CN101741224A (en) * | 2009-12-30 | 2010-06-16 | 北京东土科技股份有限公司 | Voltage-drop compensation method for power output lines and switch power supply |
| CN202535268U (en) * | 2012-05-08 | 2012-11-14 | 中南林业科技大学 | Parallel connection running device of switch power supply |
| CN206195609U (en) * | 2016-12-01 | 2017-05-24 | 武汉兴通力电源技术有限公司 | Parallel outlet redundant circuit |
| CN208890653U (en) * | 2018-10-16 | 2019-05-21 | 广州金升阳科技有限公司 | A kind of power circuit and power sources in parallel system |
-
2018
- 2018-10-16 CN CN201811213886.2A patent/CN109120159A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06165488A (en) * | 1992-11-26 | 1994-06-10 | Fuji Electric Co Ltd | Switching power supply device |
| CN1450431A (en) * | 2003-01-13 | 2003-10-22 | 艾默生网络能源有限公司 | Compensation circuit and method for diode voltage drop of power supply output terminal |
| US20080309161A1 (en) * | 2007-06-15 | 2008-12-18 | Samsung Electronics Co., Ltd. | Multi-output power supply device |
| CN101741224A (en) * | 2009-12-30 | 2010-06-16 | 北京东土科技股份有限公司 | Voltage-drop compensation method for power output lines and switch power supply |
| CN202535268U (en) * | 2012-05-08 | 2012-11-14 | 中南林业科技大学 | Parallel connection running device of switch power supply |
| CN206195609U (en) * | 2016-12-01 | 2017-05-24 | 武汉兴通力电源技术有限公司 | Parallel outlet redundant circuit |
| CN208890653U (en) * | 2018-10-16 | 2019-05-21 | 广州金升阳科技有限公司 | A kind of power circuit and power sources in parallel system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039064A (en) * | 2020-08-31 | 2020-12-04 | 科华恒盛股份有限公司 | Control method based on power supply system and related device |
| CN112039064B (en) * | 2020-08-31 | 2022-05-10 | 科华恒盛股份有限公司 | Control method based on power supply system and related device |
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Application publication date: 20190101 |