CN205355791U - Modular power exports overcurrent protect device - Google Patents
Modular power exports overcurrent protect device Download PDFInfo
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- CN205355791U CN205355791U CN201620074148.4U CN201620074148U CN205355791U CN 205355791 U CN205355791 U CN 205355791U CN 201620074148 U CN201620074148 U CN 201620074148U CN 205355791 U CN205355791 U CN 205355791U
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Abstract
The utility model provides a modular power exports overcurrent protect device, connects the output GND2 at the module power including detecting resistance R1, is the magnitude of voltage with current switchover to it puts comparator positive going input end to convey fortune to voltage signal through current -limiting resistor R2, the supplementary power supply source of 5V is connected to voltage reference chip, pin 1, 2 ground connection of pin, and 1, 3 short circuits of pin make 1, 2 both ends of pin have a reference voltage value, it puts the negative sense input of comparator to draw the circuit in the middle of a divider resistance R3 and the 2nd divider resistance R4 to fortune, the comparator is put to fortune, through the voltage that compares port 2 and port 3, to 1 output high level of port or low level to control opto -coupler break -make, , fortune establishes RC delay circuit on putting the supply circuit of comparator for the start -up that makes whole device lags behind the start -up of module power. Through protection device, control the electric current, make the overcurrent protection reliability of module power promote, if the module power was in the stream mode for a long time, with the entering mode of having the hiccups, realize the protection.
Description
Technical field
This utility model relates to modular power, and the structure especially protecting device with a kind of modular power output overcurrent is relevant.
Background technology
Growing along with switch power technology, the modular power that some power are big, volume is little, way is few is well developed.And be not a single road or two-way output in many power-supply systems, but there is multiple voltage, multiple output function, this is accomplished by carrying out modular power source secondary development, is combined by multiple module, forms modular power.
But because modular power source device distribution density is big; via wiring is more; its reliability is had strong influence by this; when function enhancing, way increase, whole aircraft reliability also has a degree of decline, when the current foldback circuit of modular power source itself lost efficacy; if there is short circuit in late-class circuit; modular power source will always be in over-power condition, and power device works overloadingly, and extremely easily damages.Tackle accordingly, it would be desirable to set up additional protection means in outside.
Utility model content
This utility model provides a kind of modular power output overcurrent protection device; not enough to solve above-mentioned prior art; pass through external protector; electric current is controlled; the overcurrent protection reliability making modular power source promotes; if modular power source is chronically at over-current state, pattern that entrance is had the hiccups, it is achieved protection.
In order to realize the purpose of this utility model, intend adopting techniques below:
A kind of modular power output overcurrent protection device, it is characterised in that including:
Detection resistance R1, is connected to the outfan GND2 of modular power source, is used for detecting output electric current, convert electrical current into magnitude of voltage, and by current-limiting resistance R2, voltage signal is sent to amplifier comparator positive input；
Current-limiting resistance R2, one end connects detection resistance R1, and the other end connects the port 3 of amplifier comparator, for detection signal is delivered to amplifier comparator positive input；
Voltage reference chip, pin 1 connects 5V auxiliary power supply source, pin 2 ground connection, pin 1,3 short circuit, makes pin 1,2 two ends have a reference voltage value；
Bleeder circuit, one end connects voltage reference chip pin 3, and one end ground connection, including the first divider resistance R3 and the second divider resistance R4, in the middle of first divider resistance R3 and the second divider resistance R4, lead line is to the port 2 of amplifier comparator, for allowing the negative input of amplifier comparator get a voltage；
Amplifier comparator, by comparing port 2 and the voltage of port 3, exports high level or low level to port 1, thus controlling optocoupler break-make；
Optocoupler, pin 1 connects the port 1 of amplifier comparator, the enable foot of pin 4 link block power supply, and the input GND1 of pin 3 link block power supply, in order to turn off or on modular power source；
RC delay circuit, is located on the power supply circuits of amplifier comparator, is used for the startup hysteresis making whole device in the startup of modular power source.
Further, described voltage reference chip is TL431.
Further, described amplifier comparator is LM258.
Further, described optocoupler is TLP281.
The beneficial effects of the utility model are:
1, the voltage swing of its positive input and negative input is compared by amplifier comparator; thus whether the output of detection module power supply crosses stream; and comparative result is inputted optocoupler with high level or low level form; realize modular power source by optocoupler break-make and enable the short circuit of foot or unsettled; realizing closedown and the unlatching of power supply, if power supply is chronically at output overcurrent state, then power supply is constantly in the circulation of " open and close open and close "; it is in the pattern of having the hiccups, it is achieved protection；
2, for after preventing modular power source start, the charging of rear class electric capacity causes circuit erroneous action, with the addition of RC delay circuit, make the startup hysteresis startup in modular power source of whole device on amplifier comparator power supply circuits；
3, this utility model circuit structure is simple, it is easy to accomplish, it is suitable for popularization and application.
Accompanying drawing explanation
Fig. 1 illustrates this utility model structural representation.
Fig. 2 illustrates test waveform figure of the present utility model.
Detailed description of the invention
As it is shown in figure 1, a kind of modular power output overcurrent protection device, including: detection resistance R1; it is connected to the outfan GND2 of modular power source; for detecting output electric current, convert electrical current into magnitude of voltage, and by current-limiting resistance R2, voltage signal is sent to amplifier comparator positive input；Current-limiting resistance R2, one end connects detection resistance R1, and the other end connects the port 3 of amplifier comparator, for detection signal is delivered to amplifier comparator positive input；Voltage reference chip, pin 1 connects 5V auxiliary power supply source, pin 2 ground connection, pin 1,3 short circuit, makes pin 1,2 two ends have a reference voltage value；Bleeder circuit, one end connects voltage reference chip pin 3, and one end ground connection, including the first divider resistance R3 and the second divider resistance R4, in the middle of first divider resistance R3 and the second divider resistance R4, lead line is to the port 2 of amplifier comparator, for allowing the negative input of amplifier comparator get a voltage；Amplifier comparator, by comparing port 2 and the voltage of port 3, exports high level or low level to port 1, thus controlling optocoupler break-make；Optocoupler, pin 1 connects the port 1 of amplifier comparator, the enable foot of pin 4 link block power supply, and the input GND1 of pin 3 link block power supply, in order to turn off or on modular power source；RC delay circuit, is located on the power supply circuits of amplifier comparator, is used for the startup hysteresis making whole device in the startup of modular power source.
Concrete, described voltage reference chip is TL431, and described amplifier comparator is LM258, and described optocoupler is TLP281.
There is a reference voltage value at voltage reference chip pin 1,2 two ends, after the first divider resistance R3 and the second divider resistance R4 dividing potential drop, the negative input of amplifier comparator, namely port 2 points a voltage；When the output electric current of modular power source is by detecting resistance R1, R1 gets at two ends a magnitude of voltage, and when R1 resistance value is fixing, its both end voltage is directly proportional with electric current, voltage signal can be sent to amplifier comparator positive input, i.e. port 3 by current-limiting resistance R2.When being embodied as, the resistance value of R3, R4 is set according to output upper current limit value, when making stream, the voltage U at current-limiting resistance R2 two endsR2Voltage higher than R3, R4 intermediate point.
When the output overcurrent of modular power source, current value is higher than higher limit, thus the voltage of amplifier comparator port 3 will be above port 2, its port 1 exports high level, now optocoupler normal operation, and its pin 3, pin 4 present low resistance state, the enable foot of modular power source and GND1 short circuit, modular power source is closed；
After modular power source is closed, R1 no current passes through, and R1 both end voltage is also 0V, and the voltage of amplifier comparator port 3 is lower than port 2, and its port 1 output low level, now optocoupler 3,4 foot is high-impedance state, and it is unsettled that modular power source enables foot, and modular power source normally exports；
If flowing through the electric current of R1 still higher than upper current limit value, then the voltage of amplifier comparator port 3 will be above port 2, and its port 1 exports high level, optocoupler normal operation, and its pin 3, pin 4 present low resistance state, and modular power source is again switched off；
If modular power source is chronically at the state of output overcurrent, being then constantly in the circulation of " open and close open and close ", enter pattern of having the hiccups, its test waveform is as shown in Figure 2.
After preventing modular power source start, the charging of rear class electric capacity causes circuit erroneous action, with the addition of RC delay circuit, make the startup hysteresis startup in modular power source of whole device on amplifier comparator power supply circuits.
Claims (4)
1. a modular power output overcurrent protection device, it is characterised in that including:
Detection resistance R1, is connected to the outfan GND2 of modular power source, is used for detecting output electric current, convert electrical current into magnitude of voltage, and by current-limiting resistance R2, voltage signal is sent to amplifier comparator positive input；
Current-limiting resistance R2, one end connects detection resistance R1, and the other end connects the port 3 of amplifier comparator, for detection signal is delivered to amplifier comparator positive input；
Voltage reference chip, pin 1 connects 5V auxiliary power supply source, pin 2 ground connection, pin 1,3 short circuit, makes pin 1,2 two ends have a reference voltage value；
Bleeder circuit, one end connects voltage reference chip pin 3, and one end ground connection, including the first divider resistance R3 and the second divider resistance R4, in the middle of first divider resistance R3 and the second divider resistance R4, lead line is to the port 2 of amplifier comparator, for allowing the negative input of amplifier comparator get a voltage；
Amplifier comparator, by comparing port 2 and the voltage of port 3, exports high level or low level to port 1, thus controlling optocoupler break-make；
Optocoupler, pin 1 connects the port 1 of amplifier comparator, the enable foot of pin 4 link block power supply, and the input GND1 of pin 3 link block power supply, in order to turn off or on modular power source；
RC delay circuit, is located on the power supply circuits of amplifier comparator, is used for the startup hysteresis making whole device in the startup of modular power source.
2. modular power output overcurrent according to claim 1 protection device, it is characterised in that described voltage reference chip is TL431.
3. modular power output overcurrent according to claim 1 protection device, it is characterised in that described amplifier comparator is LM258.
4. modular power output overcurrent according to claim 1 protection device, it is characterised in that described optocoupler is TLP281.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620074148.4U CN205355791U (en) | 2016-01-26 | 2016-01-26 | Modular power exports overcurrent protect device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620074148.4U CN205355791U (en) | 2016-01-26 | 2016-01-26 | Modular power exports overcurrent protect device |
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| Publication Number | Publication Date |
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| CN205355791U true CN205355791U (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620074148.4U Active CN205355791U (en) | 2016-01-26 | 2016-01-26 | Modular power exports overcurrent protect device |
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| CN (1) | CN205355791U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419592A (en) * | 2021-06-25 | 2021-09-21 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
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2016
- 2016-01-26 CN CN201620074148.4U patent/CN205355791U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419592A (en) * | 2021-06-25 | 2021-09-21 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
| CN113419592B (en) * | 2021-06-25 | 2023-02-28 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190813 Address after: 610052 No. 10 Chenghong Road, Chenghua District, Chengdu City, Sichuan Province Patentee after: SICHUAN SHENGHUA POWER SUPPLY TECHNOLOGY CO., LTD. Address before: 610123 No. 12 Chenxi Street, Xinxing Town Town, Tianfu New District, Chengdu City, Sichuan Province Patentee before: CHENGDU SAILIN TECHNOLOGY CO., LTD. |