CN101557099B - Module power supply short-circuit protective circuit - Google Patents
Module power supply short-circuit protective circuit Download PDFInfo
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- CN101557099B CN101557099B CN2009101073085A CN200910107308A CN101557099B CN 101557099 B CN101557099 B CN 101557099B CN 2009101073085 A CN2009101073085 A CN 2009101073085A CN 200910107308 A CN200910107308 A CN 200910107308A CN 101557099 B CN101557099 B CN 101557099B
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Abstract
The invention discloses a module power supply short-circuit protective circuit. The circuit comprises a switching element and a power supply monitoring module, wherein the power supply monitoring module is used for setting a predetermined voltage threshold, detecting the voltage of a voltage input pole and a voltage output pole of the switching element, and respectively comparing and judging whether the voltage values at the two ends are within the voltage threshold; if so, the power supply monitoring module controls the switching element to close through the controlled pole of the power supply monitoring module, if not, the switching element is controlled to be opened. The invention adopts simple and reliable circuit design and effectively resolves the protection problems of nearby short circuit and distant short circuit of the module power supply.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of module power supply short-circuit protective circuit of field of switch power.
Background technology
Current, modular power source has obtained extensive use with advantages such as its high efficiency, small sizes.All use modular power source in a large number in communications fields such as switching equipment, access device, mobile communication, microwave communication and optical transmission, routers.
Short-circuit protection to modular power source is important measures that ensure product reliability, is important indicator of product design, also is that product carries out big event of world authentication.(Network Equipment-BuildingSystem, NEBS) authentication has clearly proposed modular power source near-end and far-end short-circuit test, and has formulated corresponding by rule at the NEBS of communication equipment in the North America.
See also Fig. 1, it is a prior art module power supply short-circuit protective circuit schematic diagram.
Module power supply short-circuit protective circuit comprises modular power source, fuse and load.Modular power source loads on load by fuse with voltage.Fuse also can be replaced by thermistor.
This module power supply short-circuit protective circuit is by adding fuse or thermistor is realized in power output circuit to the short-circuit protection of modular power source.These safeguard measures can be finished the function of protection power supply substantially, need manual reversion but exist, and have the danger of big electric current heating causing fire.
In addition, come the control module power supply to export by the monitoring power supply chip in addition and realize short-circuit protection function, but find that by a large amount of practices this measure can only can't carry out the far-end short-circuit protection function at modular power source near-end short-circuit protection.During the far-end short circuit; Short-Circuit High Current is through control chip and printed circuit board (PCB) (Printed circuit board; PCB) cabling arrives monitoring chip; because control chip self-resistance and PCB walk the existence of line resistance; make voltage that the monitoring power supply chip detection arrives within the monitoring voltage thresholding, thereby can not discern the far-end short circuit, and can't realize the function of modular power source far-end short-circuit protection; cause potential safety hazard, can not be by North America NEBS authentication.In the globalisation of production epoch, be a problem that must solve at the comprehensive security short-circuit protection of modular power source.
Summary of the invention
For solving the protection problem of modular power source near-end short circuit and far-end short circuit, be necessary to provide a kind of module power supply short-circuit protective circuit that addresses this problem.
Module power supply short-circuit protective circuit of the present invention, it comprises switch element and Power Monitoring Unit, wherein:
Described Power Monitoring Unit, be used to be provided with predetermined voltage threshold, survey the voltage input utmost point of described switch element and the voltage of voltage output stage, relatively whether the magnitude of voltage at two ends falls into described voltage threshold respectively, if be entirely, then described Power Monitoring Unit is controlled described switch element closure by the controlled utmost point of described switch element, otherwise, control described switch element and disconnect;
Described Power Monitoring Unit also is used for when described switch element disconnects, by described controlled utmost point transmission one make described switch element closed with opening time duty ratio less than one control signal, control the duty ratio closure of described switch element according to described control signal.
In foregoing circuit, also comprise resistance, described resistance one end connects described Power Monitoring Unit, and the other end connects the described controlled utmost point, is used to transmit described control signal.
In foregoing circuit, also comprise electric capacity, described electric capacity one end connects the end that described resistance is connected with described Power Monitoring Unit, other end ground connection.
In foregoing circuit, described switch element is a metal-oxide-semiconductor, and described voltage is imported very source electrode, very drain electrode of described voltage output, described controlled very grid.
In foregoing circuit, described switch element is a triode, and described voltage is imported very collector electrode, and described voltage is exported very emitter, described controlled very base stage.
Compared with prior art; module power supply short-circuit protective circuit of the present invention provides a kind of module power supply short-circuit protective bill of comparatively comprehensive security; adopt simple, reliable circuit design, solved the protection problem of short circuit of modular power source near-end and far-end short circuit effectively.
After the detailed description of reading embodiment of the present invention in conjunction with the accompanying drawings, it is clearer that characteristics of the present invention and advantage will become.
Description of drawings
Fig. 1 is a prior art module power supply short-circuit protective circuit schematic diagram;
Fig. 2 is a module power supply short-circuit protective circuit schematic diagram of the present invention;
Fig. 3 is an embodiment of the invention module power supply short-circuit protective circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing module power supply short-circuit protective circuit of the present invention is described.
See also Fig. 2, it is a module power supply short-circuit protective circuit schematic diagram of the present invention.
Module power supply short-circuit protective circuit of the present invention comprises modular power source, switch element, Power Monitoring Unit, resistance, electric capacity and load.
Wherein, modular power source comprises two inputs and two outputs.Two inputs are respectively cathode output end Vin+ and cathode output end Vin-.Two outputs are respectively cathode output end and cathode output end, cathode output end ground connection (GND).Switch element comprises three pins, is respectively the input utmost point, output stage and the controlled utmost point.Power Monitoring Unit comprises three pins, is respectively first end of probe, second end of probe and control end.The cathode output end of module voltage is connected with the input utmost point of switch element, and the output stage of switch element is connected with an end of load, the other end ground connection of load.First end of probe of Power Monitoring Unit is connected with the input utmost point (near-end), and second end of probe is connected with the earth-free end of load (far-end), and the controlled utmost point is by capacitor C ground connection.The control end of Power Monitoring Unit is connected with the controlled utmost point by resistance R.
Modular power source is used for receiving input voltage signal by input, by the predetermined output voltage signal of output output.
Switch element is used for closure or disconnects being connected between modular power source and the load.
Power Monitoring Unit, be used for according to default voltage threshold, it is compared with the voltage that first end of probe and second end of probe detect, as long as the voltage that voltage threshold detects less than first end of probe or second end of probe, disconnect by controlled utmost point control switch element, if the voltage that voltage threshold all detects greater than first end of probe and second end of probe, then control switch element closure.
Resistance R is used for current limliting, also is called current-limiting resistance.Capacitor C is used for filtering, also is called filter capacitor.
The operation principle of module power supply short-circuit protective circuit of the present invention is as described below:
At first, modular power source receives extraneous input voltage signal, transforms, and obtains and export predetermined output voltage signal, and output voltage signal reloads the two ends in load by switch element.Simultaneously, the voltage of the first end of probe search switch element input utmost point of Power Monitoring Unit, obtain first magnitude of voltage, the second end of probe detecting voltage is surveyed the voltage of the earth-free end of load, obtain second magnitude of voltage, and, respectively this first magnitude of voltage and second magnitude of voltage are compared with the voltage threshold that Power Monitoring Unit is preset, if first magnitude of voltage or second magnitude of voltage are less than voltage threshold, disconnect by controlled utmost point control switch element, then, if first magnitude of voltage falls into voltage threshold, then by controlled utmost point control switch element closure.
Secondly, by the internal logic circuit of Power Monitoring Unit, realize " having the hiccups " formula (hiccup) protection.Promptly, first magnitude of voltage of surveying when first end of probe of Power Monitoring Unit is during less than voltage threshold, or second magnitude of voltage of surveying when second end of probe is during less than voltage threshold, the disconnection of Power Monitoring Unit control switch element, at this moment, Power Monitoring Unit control switch element closure.This be by, in the internal logic circuit of Power Monitoring Unit, the duty ratio of closed and disconnected switch element is set, and the duty ratio of closed and disconnected switch element makes that less than 1 the power output of modular power source is less.Like this, even long-time short circuit, element in the circuit and cabling do not have too big heating phenomenon.When short circuit disappears, Power Monitoring Unit control switch element closure, circuit normally.
See also Fig. 3, it is an embodiment of the invention module power supply short-circuit protective circuit schematic diagram.
Modular power source is that 12V changes the 1.2V modular power source.Switch element is N-channel MOS power tube IRF7831, and cut-ff voltage VGS equals 30V between grid and the source electrode, and puncture voltage VDS equals 12V between drain electrode and the source electrode.Filter capacitor C adopts 0.01uF ceramic paster electric capacity.Current-limiting resistance R adopts 10 ohm of Chip-Rs.
The ADM1065 chip is surveyed first magnitude of voltage at near-end A point, also is called the A point voltage.Survey second magnitude of voltage at far-end B point, also be called the B point voltage.The A point connects the source electrode of metal-oxide-semiconductor, and the B point connects the drain electrode of metal-oxide-semiconductor.
Power Monitoring Unit adopts the ADM1065 chip.When not being short-circuited phenomenon, the ADM1065 chip is surveyed first magnitude of voltage at the A point, is normal working voltage value, i.e. 1.2V.Consider that it generally all is 10% of normal working voltage that the ADM1065 chip can bear voltage fluctuation, the voltage threshold of ADM1065 is set to 1.2V ± (1.2V * 10%), i.e. 1.08V～1.32V.When A point or B point voltage were outside this voltage threshold, ADM1065 chip controls metal-oxide-semiconductor IRF7831 disconnected, and carried out power protection.
When the short circuit of A point, metal-oxide-semiconductor IRF7831 disconnects, and the B point does not have voltage.
When the short circuit of B point, metal-oxide-semiconductor IRF7831 disconnects.At this moment, will realize the hiccup protection.As if the A point voltage is 1.2V, in this case ADM1065 chip controls metal-oxide-semiconductor IRF7831 closure.And the short circuit of B point makes metal-oxide-semiconductor IRF7831 disconnect.
The ADM1065 internal logic circuit is set, and making the closed and disconnected time ratio is 1: 5, and promptly duty ratio is 1: 5.So, even the B point makes long-time short circuit, element in the circuit and cabling do not have excessive heating phenomenon yet.When the short circuit of B point disappears, ADM1065 chip controls metal-oxide-semiconductor IRF7831 closure.
When A point and the short circuit simultaneously of B point, the ADM1065 chip disconnects metal-oxide-semiconductor IRF7831 always.
In the above-described embodiments, switch element is a metal-oxide-semiconductor.Correspondingly, switch element can also be triode, and the collector electrode of triode, emitter and base stage be source electrode, the drain and gate of corresponding metal-oxide-semiconductor respectively.
Compared with prior art; module power supply short-circuit protective circuit of the present invention provides a kind of module power supply short-circuit protective bill of comparatively comprehensive security; adopt simple, reliable circuit design, solved the protection problem of short circuit of modular power source near-end and far-end short circuit effectively.
Only be preferred case study on implementation of the present invention below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. module power supply short-circuit protective circuit, it comprises switch element and Power Monitoring Unit, it is characterized in that:
Described Power Monitoring Unit, be used to be provided with predetermined voltage threshold, survey the voltage input utmost point of described switch element and the voltage of voltage output stage, relatively whether the magnitude of voltage at two ends falls into described voltage threshold respectively, if be entirely, then described Power Monitoring Unit is controlled described switch element closure by the controlled utmost point of described switch element, otherwise, control described switch element and disconnect;
Described Power Monitoring Unit also is used for when described switch element disconnects, by described controlled utmost point transmission one make described switch element closed with opening time duty ratio less than one control signal, control the duty ratio closure of described switch element according to described control signal.
2. circuit according to claim 1 is characterized in that, also comprises resistance, and described resistance one end connects described Power Monitoring Unit, and the other end connects the described controlled utmost point, is used to transmit described control signal.
3. circuit according to claim 2 is characterized in that, also comprises electric capacity, and described electric capacity one end connects the end that described resistance is connected with described Power Monitoring Unit, other end ground connection.
4. circuit according to claim 1 is characterized in that, described switch element is a metal-oxide-semiconductor, and described voltage is imported very source electrode, very drain electrode of described voltage output, described controlled very grid.
5. circuit according to claim 1 is characterized in that, described switch element is a triode, and described voltage is imported very collector electrode, and described voltage is exported very emitter, described controlled very base stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101073085A CN101557099B (en) | 2009-05-12 | 2009-05-12 | Module power supply short-circuit protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101073085A CN101557099B (en) | 2009-05-12 | 2009-05-12 | Module power supply short-circuit protective circuit |
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| Publication Number | Publication Date |
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| CN101557099A CN101557099A (en) | 2009-10-14 |
| CN101557099B true CN101557099B (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101073085A Active CN101557099B (en) | 2009-05-12 | 2009-05-12 | Module power supply short-circuit protective circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694370A (en) * | 2011-03-22 | 2012-09-26 | 飞毛腿(福建)电子有限公司 | Power supply positive end turn-off protection method |
| US9263937B2 (en) * | 2013-12-11 | 2016-02-16 | Monolithic Power Systems, Inc. | Short protection circuit for power switch and associated protection method |
| CN113381378B (en) * | 2021-08-12 | 2021-11-02 | 苏州浪潮智能科技有限公司 | High-reliability protection circuit and power supply system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5735254A (en) * | 1995-04-28 | 1998-04-07 | Sgs-Thomson Microelectronics S.R.L. | Circuit for detecting an overvoltage on a switched inductive load |
| CN1961419A (en) * | 2004-06-01 | 2007-05-09 | 罗姆股份有限公司 | Semiconductor device and electronic device |
| CN101378185A (en) * | 2007-08-28 | 2009-03-04 | 雅迪信科技有限公司 | Electronic circuit breaker and method |
-
2009
- 2009-05-12 CN CN2009101073085A patent/CN101557099B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5735254A (en) * | 1995-04-28 | 1998-04-07 | Sgs-Thomson Microelectronics S.R.L. | Circuit for detecting an overvoltage on a switched inductive load |
| CN1961419A (en) * | 2004-06-01 | 2007-05-09 | 罗姆股份有限公司 | Semiconductor device and electronic device |
| CN101378185A (en) * | 2007-08-28 | 2009-03-04 | 雅迪信科技有限公司 | Electronic circuit breaker and method |
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| CN101557099A (en) | 2009-10-14 |
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