CN205375258U - Voltage -stabilized power circuit - Google Patents
Voltage -stabilized power circuit Download PDFInfo
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- CN205375258U CN205375258U CN201620095422.6U CN201620095422U CN205375258U CN 205375258 U CN205375258 U CN 205375258U CN 201620095422 U CN201620095422 U CN 201620095422U CN 205375258 U CN205375258 U CN 205375258U
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Abstract
The utility model discloses a stabilized power supply circuit, it includes: steady voltage unit, singlechip, leakage protection circuit, load, electric current adopt and load current foldback circuit, and wherein, the steady voltage unit links to each other with the singlechip, leakage protection circuit includes hall sensor, and through hall sensor test input and output current, leakage protection circuit's one end links to each other with the one end with the singlechip links to each other of steady voltage unit, the other end links to each other with the load, and leakage protection circuit and singlechip both way junction, the load is connected between leakage protection circuit and current sample and load current foldback circuit, current sample and load current foldback circuit's one end links to each other with the steady voltage unit, and the other end links to each other with the singlechip. The utility model discloses a stabilized power supply circuit stabilization of output, load regulation is low, and the current error that earth leakage protection detected is little, and the reliability is high.
Description
Technical field
This utility model relates to the design of regulated power supply, particularly to a kind of voltage-stabilized power supply circuit.
Background technology
Along with the development of numerous portable type electronic products, the designing requirement of regulated power supply is more and more higher.Good regulated power supply chip can improve the service efficiency of the battery of electronic product and extend the continuous power of battery, therefore designs a kind of output voltage stabilization, that regulated power supply that error is little seems very is important.
Utility model content
This utility model is for above-mentioned problems of the prior art, it is proposed to a kind of voltage-stabilized power supply circuit, output voltage stabilization, and load regulation is low, and the current error of earth leakage protective detection is little, and reliability is high.
For solving above-mentioned technical problem, this utility model is achieved by the following technical solution:
This utility model provides a kind of voltage-stabilized power supply circuit, comprising: voltage regulation unit, single-chip microcomputer, leakage protection circuit, load, electric current employing and load over-current protection circuit, wherein,
Described voltage regulation unit is connected with described single-chip microcomputer；
Described leakage protection circuit includes Hall element, and one end of described leakage protection circuit is connected with one end being connected with described single-chip microcomputer of described voltage regulation unit；The other end of described leakage protection circuit is connected with described load; and described leakage protection circuit and described single-chip microcomputer are bi-directionally connected; described single-chip microcomputer Ying Yu carrys out the break-make of decision-making circuit according to the difference between current between input current and the output electric current of described Hall element; when difference between current is beyond predetermined threshold value, disconnecting circuit is to realize earth leakage protective；
Described load is connected between described leakage protection circuit and described current sample and load over-current protection circuit；
One end of described current sample and load over-current protection circuit is connected with described voltage regulation unit, and described electric current adopts and the other end of load over-current protection circuit is connected with described single-chip microcomputer.
It is preferred that also include simulation leakage current circuit, the position to be detected of described voltage-stabilized power supply circuit, the other end ground connection of described simulation leakage current circuit are accessed in one end of described simulation leakage current circuit.
It is preferred that described Hall element includes the first Hall coil and the second Hall coil, described first Hall coil is for electric current input, and described second Hall coil is for electric current output., detect leakage current by the turnover difference between current of two Hall coils.
It is preferred that described load is tunable load, it is possible to by the resistance size of regulating load, output voltage is finely tuned, make output error less.
It is preferred that described current sample and load over-current protection circuit also include: operational amplification circuit, described current sample and load over-current protection circuit are connected to described single-chip microcomputer by described operational amplification circuit.
It is preferred that described voltage regulation unit includes: voltage stabilizing element and high-power PNP power adjustment pipe.
It is preferred that described voltage stabilizing element is TL431；Described high-power PNP power adjustment pipe is C511.
It is preferred that described single-chip microcomputer is STC12C5204AD.
Compared to prior art, this utility model has the advantage that
(1) voltage-stabilized power supply circuit that this utility model provides is when direct current input changes at 5.5-27V, and output voltage is at 5 ± 0.05V, and voltage regulation factor is less than 0.2%, and output is stable；
(2) voltage-stabilized power supply circuit of the present utility model is when connecing 5.5V input voltage, and load regulation is much smaller than 1%；
(3) voltage-stabilized power supply circuit of the present utility model also includes leakage protection circuit, passes in and out difference between current by Hall element and detects leakage current, and Detection accuracy is high, and current error is less than 1mA, and earth leakage protective ability is strong, and reliability is high.
Certainly, implement arbitrary product of the present utility model to it is not absolutely required to reach all the above advantage simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
Fig. 1 is the system block diagram of voltage-stabilized power supply circuit of the present utility model；
Fig. 2 is the schematic diagram of voltage-stabilized power supply circuit of the present utility model；
Fig. 3 is the system block diagram of the voltage-stabilized power supply circuit of preferred embodiment of the present utility model.
Label declaration: 1-voltage regulation unit, 2-single-chip microcomputer, 3-leakage protection circuit, 4-load, 5-current sample and load over-current protection circuit, 6-simulates leakage current.
Detailed description of the invention
Below embodiment of the present utility model being elaborated, the present embodiment is carried out under premised on technical solutions of the utility model, gives detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
In conjunction with Fig. 1-Fig. 2, voltage-stabilized power supply circuit of the present utility model is described in detail, is illustrated in figure 1 its system block diagram, comprising: voltage regulation unit 1, single-chip microcomputer 2, leakage protection circuit 3, load 4, current sample and load over-current protection circuit 5.Wherein, voltage regulation unit 1 is connected with single-chip microcomputer 2, and one end of leakage protection circuit 3 is connected with one end being connected with single-chip microcomputer 2 of voltage regulation unit 1；The other end of leakage protection circuit 3 is connected with load 4, and leakage protection circuit 3 is bi-directionally connected with single-chip microcomputer 2；Load 4 is connected between leakage protection circuit 3 and current sample and load over-current protection circuit 5；One end of current sample and load over-current protection circuit 5 is connected with voltage regulation unit 1, and electric current adopts and the other end of load over-current protection circuit 5 is connected with single-chip microcomputer 2.
The leakage protection circuit 3 of the present embodiment adopts Hall element detection leakage current to realize earth leakage protective, particularly as follows: by Hall element turnover difference between current detection leakage current, cut off out-put supply to realize earth leakage protective according to leakage current intelligence.Existing earth leakage protective adopts the earth leakage protective of direct current signal; its difficulty when small area analysis detects is bigger; the general AD connecting two less resistance single-chip microcomputers detects electric current and enters the size of electric current; the method needs higher AD conversion precision, and load itself is also affected a little by two resistance of series connection simultaneously.The pressure reduction that the turnover electric current of the leakage protection circuit application Hall element of the present embodiment produces detects leakage current, and when without leakage current, due to electric current input and output balance, sensor output voltage is zero.If have leakage current to occur; there is imbalance in the electric current that first Hall coil and the second Hall coil flow through; this will make Hall element output voltage produce change; this change voltage is carried out differential mode amplification by amplifier; the unbalance voltage that this leakage current produces is amplified; deliver to single-chip microcomputer and carry out AD voltage sample, when voltage reaches setting value, Single-chip Controlling relay realize creepage protection function.
The input voltage of native system can be DC5.5V-27V, circuit design drawing is as shown in Figure 2, utilize TL431 as reference power supply, negative electrode and control pole connect, C511 is as high-power PNP power adjustment pipe, and output electric current is up to 3A, and burning voltage exports from the colelctor electrode of C511, conduction voltage drop is non-normally low, and pressure reduction is up to 0.3V.When line voltage or load change cause output voltage to change; current sample and load over-current protection circuit 5 send the part feedback of output voltage back to operational amplifier; compare with reference voltage; the amplified base stage through promoting level to remove to control C511 of error voltage produced; automatically adjust the voltage between the collection-emitter-base bandgap grading of C511; compensating the change of output, being basically unchanged thus maintaining output voltage.In circuit, TL431 stable voltage is 2.5V, equally, the 3 foot voltages of LM358 operational amplifier U1 also require that at about 2.5V, R6 resistance is chosen as 300 Ω, according to formula Vo=R1*2.5/300+2.5, R1 should be 300 Ω, but due to the discreteness of circuit parameter, R1 may be configured as adjustment resistance 5V voltage can accurately be exported.
In the present embodiment, in order to test native system bearing power, except test output voltage, the electric current flowing through load must also be tested, as shown in Figure 2, the P2.1 of single-chip microcomputer can direct AD sampling and outputting voltage, but testing current converts voltage to after needing other series resistance could allow single-chip microcomputer test, native system has been connected the resistance R9 of 0.1 Ω on load circuit, consider electric current minimum be for 1mA, changing into voltage is 0.1mV, 8 Chip Microcomputer A/D sampling precisions obviously do not reach testing requirement, at this moment 20 times of ratio operational amplification circuits that additional U2 forms are needed, with the P2.0 mouth of single-chip microcomputer from the 7 foot sampled voltages of U2, thus test load power after conversing electric current.Except being used for testing electric current, this circuit is a load over-current protection circuit still, as shown in Figure 2; LM358 operational amplifier U2 in-phase input end carries out current sample at R9 place; when exporting electric current and increasing, the voltage of 7 feet is stepped up, when the voltage of 7 feet is higher than 3 foot voltage; output voltage begins to decline; output electric current is made to be restricted, 7 the highest about the 3V that are stabilized in of foot sampled voltage, at this moment; output electric current is stabilized in about 1.2A, it is achieved that export automatic overcurrent protection.
When system boot runs, relay normally closed switch connects output 5V power supply powering load, load circuit electric current, electric power output voltage and leakage current are measured by single-chip microcomputer by 8 internal A/D converters, single-chip microcomputer, by calculating, shows output supply voltage, power and leakage current size in real time.It is preferred that in order to improve measuring accuracy, AD continuous sampling repeatedly and calculates the meansigma methods result as test.
Below the regulated power supply of the present embodiment being tested, test process is as follows:
(1) load RP1 resistance is fixed as 5 Ω, and DC voltage inputs when 5.5V-7V changes, and output voltage size is as shown in table 1:
Table 1 adjusts actual output voltage during input voltage
| Input voltage output voltage | Input voltage output voltage | Input voltage output voltage | Input voltage output voltage |
| 5.5V 5.0013V | 10V 5.0033V | 18V 5.0055V | 24V 5.0067V |
| 6.0V 5.0015V | 12V 5.0038V | 20V 5.0060V | 25V 5.0067V |
| 7.0V 5.0020V | 14V 5.0047V | 22V 5.0063V | 26V 5.0068V |
| 8.0V 5.0028V | 16V 5.0051V | 23V 5.0066V | 27V 5.0069V |
Voltage regulation factor is:
U in formulaO2Output voltage values during for input 27V voltage, UO1Representing output voltage values during input 5.5V voltage, result of calculation shows that voltage regulation factor is less than 0.2%.
(2) direct current input is fixed on 5.5V, and when adjustment load makes D.C. regulated power supply output electric current be reduced to 0.01A by 1A, output voltage size is as shown in table 2:
Table 2 adjusts output voltage after load
| Load current output voltage | Load current output voltage | Load current output voltage |
| 0.01A 5.0011V | 0.20A 4.9931V | 0.5A 4.9890V |
| 0.15A 4.9993V | 0.35A 4.9932V | 1A 4.9846V |
Load regulation is:
When result of calculation shows to connect 5.5V input voltage, load regulation is much smaller than 1%.
(3) earth leakage protective testing current
Table 3 leakage protection circuit is tested
| First time test | Second time test | Third time test |
| 29.81mA | 30.11mA | 29.87mA |
Testing through three times, result shows that earth leakage protective action current error is less than 1mA, very precisely.
By above-mentioned test it can be seen that the voltage-stabilized power supply circuit in the present embodiment is when input voltage changes at 5.5V-27V, output voltage is at 5 ± 0.5V, and voltage output is stable, and regulation is less than 0.2%；Stable when 5.5V in voltage input, when regulated power supply output electric current is reduced to 0.01A by 1A, load regulation SL≤1%, there is low voltage difference function；Being also devised with earth leakage protective current device, pass in and out difference between current detection leakage current by Hall element, Detection accuracy is high, and current error is less than 1mA.
In preferred embodiment, voltage-stabilized power supply circuit also includes: simulation leakage current 6 one end is accessed in voltage-stabilized power supply circuit, and other end ground connection is illustrated in figure 3 and is linked between leakage protection circuit 3 and load 4 by simulation leakage current 6
Disclosed herein is only preferred embodiment of the present utility model, and these embodiments are chosen and specifically described to this specification, is to explain principle of the present utility model and practical application better, is not to restriction of the present utility model.The modifications and variations that any those skilled in the art do within the scope of description, all should drop in the scope that this utility model is protected.
Claims (8)
1. a voltage-stabilized power supply circuit, it is characterised in that including: voltage regulation unit, single-chip microcomputer, leakage protection circuit, load, electric current adopt and load over-current protection circuit, wherein,
Described voltage regulation unit is connected with described single-chip microcomputer；
Described leakage protection circuit includes Hall element, and one end of described leakage protection circuit is connected with one end being connected with described single-chip microcomputer of described voltage regulation unit；The other end of described leakage protection circuit is connected with described load, and described leakage protection circuit is bi-directionally connected with described single-chip microcomputer, and described single-chip microcomputer carrys out the break-make of decision-making circuit for the difference between current between the input current according to described Hall element and output electric current；
Described load is connected between described leakage protection circuit and described current sample and load over-current protection circuit；
One end of described current sample and load over-current protection circuit is connected with described voltage regulation unit, and described electric current adopts and the other end of load over-current protection circuit is connected with described single-chip microcomputer.
2. voltage-stabilized power supply circuit according to claim 1, it is characterised in that also including simulation leakage current circuit, the position to be detected of described voltage-stabilized power supply circuit, the other end ground connection of described simulation leakage current circuit are accessed in one end of described simulation leakage current circuit.
3. voltage-stabilized power supply circuit according to claim 1, it is characterised in that described Hall element includes the first Hall coil and the second Hall coil, described first Hall coil is for electric current input, and described second Hall coil is for electric current output.
4. voltage-stabilized power supply circuit according to claim 1, it is characterised in that described load is tunable load.
5. voltage-stabilized power supply circuit according to claim 1; it is characterized in that; described current sample and load over-current protection circuit also include: operational amplification circuit, and described current sample and load over-current protection circuit are connected to described single-chip microcomputer by described operational amplification circuit.
6. voltage-stabilized power supply circuit according to claim 1, it is characterised in that described voltage regulation unit includes: voltage stabilizing element and high-power PNP power adjustment pipe.
7. voltage-stabilized power supply circuit according to claim 6, it is characterised in that described voltage stabilizing element is TL431；Described high-power PNP power adjustment pipe is C511.
8. voltage-stabilized power supply circuit according to claim 1, it is characterised in that described single-chip microcomputer is STC12C5204AD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620095422.6U CN205375258U (en) | 2016-01-29 | 2016-01-29 | Voltage -stabilized power circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620095422.6U CN205375258U (en) | 2016-01-29 | 2016-01-29 | Voltage -stabilized power circuit |
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| CN205375258U true CN205375258U (en) | 2016-07-06 |
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| CN201620095422.6U Expired - Fee Related CN205375258U (en) | 2016-01-29 | 2016-01-29 | Voltage -stabilized power circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106055005A (en) * | 2016-07-26 | 2016-10-26 | 苏州工业职业技术学院 | Linear DC regulated power supply capable of earth leakage protection |
| CN110721804A (en) * | 2019-09-05 | 2020-01-24 | 徐州傲扬自动化科技有限公司 | Constant pressure system for material crushing equipment |
| CN112363426A (en) * | 2020-10-22 | 2021-02-12 | 北京航天光华电子技术有限公司 | Intelligent power-on system |
| CN112783025A (en) * | 2020-12-29 | 2021-05-11 | 上海顺舟智能科技股份有限公司 | Intelligent street lamp monitoring device, monitoring system and monitoring method based on Internet of things |
-
2016
- 2016-01-29 CN CN201620095422.6U patent/CN205375258U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106055005A (en) * | 2016-07-26 | 2016-10-26 | 苏州工业职业技术学院 | Linear DC regulated power supply capable of earth leakage protection |
| CN110721804A (en) * | 2019-09-05 | 2020-01-24 | 徐州傲扬自动化科技有限公司 | Constant pressure system for material crushing equipment |
| CN112363426A (en) * | 2020-10-22 | 2021-02-12 | 北京航天光华电子技术有限公司 | Intelligent power-on system |
| CN112783025A (en) * | 2020-12-29 | 2021-05-11 | 上海顺舟智能科技股份有限公司 | Intelligent street lamp monitoring device, monitoring system and monitoring method based on Internet of things |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160706 Termination date: 20170129 |
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| CF01 | Termination of patent right due to non-payment of annual fee |