CN103166166B - Hot plug controller protective circuit - Google Patents
Hot plug controller protective circuit Download PDFInfo
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- CN103166166B CN103166166B CN201110405266.0A CN201110405266A CN103166166B CN 103166166 B CN103166166 B CN 103166166B CN 201110405266 A CN201110405266 A CN 201110405266A CN 103166166 B CN103166166 B CN 103166166B
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Abstract
The present invention relates to hot-swapping controller. The present invention is directed to prior art hot-swapping controller, the problem of soft start function defect and job insecurity, it is provided that a kind of hot plug controller protective circuit, it is to avoid hot-swapping controller misoperation. The technical scheme is that; hot plug controller protective circuit; including voltage detecting circuit, delay circuit and on-off circuit; described voltage detecting circuit input connects input voltage and reference voltage; described voltage detecting circuit outfan controls end by delay circuit with on-off circuit and is connected, and described on-off circuit is connected to hot-swapping controller and triggers between end and ground. Technical scheme, by reasonably arranging detection voltage and reference voltage, it is possible to make switch conduction at under-voltage some place, drag down hot-swapping controller and trigger the voltage of end, thus closing the output voltage of hot-swapping controller so that it is evade falling the issuable misoperation of input voltage fluctuation.
Description
Technical field
The present invention relates to hot-swapping controller, particularly to time delay and the false action-proof protection circuit of hot-swapping controller.
Background technology
Existing hot-swapping controller; especially for positive input power supply; the soft start of hot-swapping controller is undesirable or does not have soft start to control function (such as MAX5947 etc.); electric capacity below can be charged when these hot-swapping controllers start; cause bigger starting current, it is possible to hot-swapping controller can be damaged or make input power enter into overcurrent protection. In input voltage decline process, near under-voltage point, hot-swapping controller can produce the second time startup after closing. This undesirable second time starts, it is possible to cause the confusion starting sequential or the normal operation of board is impacted, in some instances it may even be possible to causing damage.
Summary of the invention
The technical problem to be solved, it is simply that for prior art hot-swapping controller, the problem of soft start function defect and job insecurity, it is provided that a kind of hot plug controller protective circuit, it is to avoid hot-swapping controller misoperation.
This invention address that described technical problem; employed technical scheme comprise that; hot plug controller protective circuit; it is characterized in that; including voltage detecting circuit, delay circuit and on-off circuit; described voltage detecting circuit input connects input voltage and reference voltage, and described voltage detecting circuit outfan controls end by delay circuit with on-off circuit and is connected, and described on-off circuit is connected to hot-swapping controller and triggers between end and ground.
Technical scheme, by reasonably arranging detection voltage and reference voltage, it is possible to make switch conduction at under-voltage some place, drags down hot-swapping controller and triggers the voltage of end, thus closing the output voltage of hot-swapping controller; When voltage detecting circuit overturns, due to the time-lag action of delay circuit, before reaching delay time, hot-swapping controller is maintained at off state, without output voltage, select suitable delay time, it is possible to make it evade falling the issuable misoperation of input voltage fluctuation.
Further, described reference voltage is obtained by the output voltage voltage stabilizing of hot-swapping controller.
This scheme reference voltage is readily obtained, and circuit structure is simpler.
Concrete, described voltage detecting circuit is made up of operational amplifier, and one input of described operational amplifier connects input voltage, and another input connects reference voltage, and its outfan is connected with delay circuit.
Connecting into comparator with operational amplifier, draw materials conveniently, cost is low.
Concrete, described delay circuit is made up of electric capacity and resistance, and after described electric capacity and resistor coupled in parallel, one end connects voltage detecting circuit outfan and on-off circuit control end, other end ground connection.
The delay circuit that resistance and electric capacity are constituted, simple in construction, delay time length is easy to adjust, and circuit cost is low.
Further, described testing circuit outfan is connected to protection circuit.
Concrete, described protection circuit is made up of diode and resistant series.
The protection that diode and resistance are constituted is electrically connected to testing circuit outfan, it is possible to circuit is managed and protects, and improves circuit reliability.
Concrete, described on-off circuit is made up of transistor.
Adopt transistor to constitute on-off circuit, technology maturation, control simple and convenient.
More specifically, described transistor is field-effect transistor, and described field effect transistor gate is for controlling end, and its drain electrode and source electrode connect hot-swapping controller respectively and trigger end and ground.
Field effect transistor is metal-oxide-semiconductor field effect transistor particularly, and voltage drives, conducting resistance is little, switch motion is reliable, good with ic process compatibility, it is simple to hot-swapping controller integration packaging.
Or, described transistor is bipolar transistor, and described bipolar transistor base stage is for controlling end, and its collector and emitter connects hot-swapping controller respectively and triggers end and ground.
The invention has the beneficial effects as follows, solve existing hot plug chip, especially for positive input power supply; the soft start function defect of hot plug chip; in input power decline process, the problem that the second time after closing starts will not be produced, protect hot-plug board card.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention;
Fig. 2 is the electrical block diagram of embodiment.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical scheme is described in detail.
As it is shown in figure 1, the hot plug controller protective circuit of the present invention, including voltage detecting circuit, delay circuit and on-off circuit. Voltage detecting circuit input connects input voltage and reference voltage, magnitude relationship according to input voltage and reference voltage, high level or low level control signal can be exported, and be connected with on-off circuit control end by delay circuit, drive being turned on and off of on-off circuit. On-off circuit breaker in middle is connected to hot-swapping controller and triggers between end and ground, and hot-swapping controller triggers end ground connection when the switch is closed, triggers end and is set to low level; Hot-swapping controller triggers terminal voltage when the switches are opened is provided input voltage dividing potential drop by hot-swapping controller internal bias circuit, triggers end and is set to high level. By reasonably arranging input voltage and reference voltage, it is possible to make switch conduction at under-voltage some place, drag down hot-swapping controller and trigger the voltage of end, thus closing the output voltage of hot-swapping controller; When voltage detecting circuit overturns, due to the time-lag action of delay circuit, before reaching delay time, hot-swapping controller is maintained at off state, without output voltage, select suitable delay time, it is possible to make it evade falling the issuable misoperation of input voltage fluctuation.
Embodiment
Referring to Fig. 2, this example hot plug controller protective circuit, it is made up of voltage detecting circuit, delay circuit and on-off circuit. In Fig. 2, voltage detecting circuit is made up of operational amplifier. The "-" input (inverting input) of operational amplifier connects input voltage by resistance R1 and the R2 bleeder circuit formed, and obtains detection voltage Vt. Operational amplifier "+" input (in-phase input end) connects reference voltage Vr, this reference voltage Vr is obtained by manostat voltage stabilizing by the output voltage Vo of hot-swapping controller. Operational amplifier output terminal is connected with delay circuit. This example delay circuit is made up of electric capacity E1 and resistance R6 parallel connection, and voltage detecting circuit outfan controls end by this delay circuit with on-off circuit and is connected. In Fig. 1, electric capacity E1 and after resistance R6 parallel connection one end connect voltage detecting circuit outfan and on-off circuit and control end, other end ground connection. This example on-off circuit is constituted Q1 by field-effect transistor and constitutes, and field-effect transistor Q1 grid is the control end of this on-off circuit, and its drain electrode and source electrode connect hot-swapping controller respectively and trigger end and ground. In Fig. 2, operational amplifier output terminal is connected to the protection circuit that diode D2 and resistance R5 is in series.
This example circuit work process describes as follows:
During operational amplifier output high level, the switch connection that field-effect transistor Q1 is constituted, hot-swapping controller is in under-voltage condition, closes output voltage Vo. During operational amplifier output low level, the switch OFF that field-effect transistor Q1 is constituted, hot-swapping controller is in normal operating conditions, normal output voltage Vo. In figure, voltage Vf is the under-voltage protection point voltage of hot plug chip, and namely hot-swapping controller triggers the operation voltage of end.
During startup, Vt > Vr, operational amplifier output low level, field-effect transistor Q1 turns off, and now hot-swapping controller normally works on power. During Vt < Vr, operational amplifier output high level, field-effect transistor Q1 turns on, and Vf is pulled to ground, and now hot plug chip controller triggers end is low level, and it exports closedown.
Electric capacity E1 and resistance R6 controls the time that hot-swapping controller is resumed work, by adjusting the discharge time of delay circuit electric capacity E1 and resistance R6, field-effect transistor Q1 turns off and hot-swapping controller just can be made to restart work, field-effect transistor Q1 is but without when turning off, and any change of input voltage Vi will not result in hot hot-swapping controller misoperation. By selecting the discharge time of suitable electric capacity E1 and resistance R6, it is possible to avoid the misoperation that the fluctuation of input voltage produces.
Above-described embodiment can not the implementation of the limit present invention, as exchanged the connection voltage of operational amplifier in-phase input end and reversed-phase output, it is possible to control the on-off circuit of Low level effective. Field-effect transistor Q1 in Fig. 1 can also replace with bipolar transistor etc. The conventional change that those skilled in the art make belongs to protection scope of the present invention.
Claims (9)
1. hot plug controller protective circuit; it is characterized in that; including voltage detecting circuit, delay circuit and on-off circuit; described voltage detecting circuit input connects input voltage and reference voltage; described voltage detecting circuit outfan controls end by delay circuit with on-off circuit and is connected, and described on-off circuit is connected to hot-swapping controller and triggers between end and ground.
2. hot plug controller protective circuit according to claim 1, it is characterised in that described reference voltage is obtained by the output voltage voltage stabilizing of hot-swapping controller.
3. hot plug controller protective circuit according to claim 1; it is characterized in that, described voltage detecting circuit is made up of operational amplifier, and one input of described operational amplifier connects input voltage; another input connects reference voltage, and its outfan is connected with delay circuit.
4. hot plug controller protective circuit according to claim 1, it is characterised in that described delay circuit is made up of electric capacity and resistance, after described electric capacity and resistor coupled in parallel, one end connects voltage detecting circuit outfan and on-off circuit control end, other end ground connection.
5. hot plug controller protective circuit according to claim 1, it is characterised in that described testing circuit outfan is connected to protection circuit.
6. hot plug controller protective circuit according to claim 5, it is characterised in that described protection circuit is made up of diode and resistant series.
7. the hot plug controller protective circuit according to claim 1��6 any one, it is characterised in that described on-off circuit is made up of transistor.
8. hot plug controller protective circuit according to claim 7, it is characterised in that described transistor is field-effect transistor, described field effect transistor gate is for controlling end, and its drain electrode and source electrode connect hot-swapping controller respectively and trigger end and ground.
9. hot plug controller protective circuit according to claim 7, it is characterised in that described transistor is bipolar transistor, described bipolar transistor base stage is for controlling end, and its collector and emitter connects hot-swapping controller respectively and triggers end and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110405266.0A CN103166166B (en) | 2011-12-08 | 2011-12-08 | Hot plug controller protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110405266.0A CN103166166B (en) | 2011-12-08 | 2011-12-08 | Hot plug controller protective circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN103166166A CN103166166A (en) | 2013-06-19 |
| CN103166166B true CN103166166B (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110405266.0A Active CN103166166B (en) | 2011-12-08 | 2011-12-08 | Hot plug controller protective circuit |
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| Country | Link |
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| CN (1) | CN103166166B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9525063B2 (en) * | 2013-10-30 | 2016-12-20 | Infineon Technologies Austria Ag | Switching circuit |
| CN105024337A (en) * | 2015-07-24 | 2015-11-04 | 西安空间无线电技术研究所 | Over-current protection circuit used for integrated circuit |
| CN105509579B (en) * | 2015-11-30 | 2017-06-23 | 无锡力芯微电子股份有限公司 | A kind of electric detonator charge protector |
| CN105634419A (en) * | 2015-12-25 | 2016-06-01 | 中国电子科技集团公司第五十四研究所 | C-waveband high-power solid-state power amplifier |
| CN107834612A (en) * | 2016-09-14 | 2018-03-23 | 航天科工惯性技术有限公司 | For with the Power Supply Monitoring instrument and method for boring instrument |
| CN109818343B (en) * | 2017-11-20 | 2021-06-08 | 深圳光峰科技股份有限公司 | Overvoltage protection circuit and projector |
| CN111934281B (en) * | 2020-08-10 | 2022-06-03 | 迈普通信技术股份有限公司 | Electronic equipment overtemperature protection circuit, electronic equipment and overtemperature protection control method |
| CN112181885B (en) * | 2020-09-01 | 2022-11-18 | 宁畅信息产业(北京)有限公司 | Hot plug circuit, mainboard and server system |
| CN112332644B (en) * | 2020-09-02 | 2021-11-02 | 京微齐力(北京)科技有限公司 | Hot plug protection circuit |
| CN113363955A (en) * | 2021-05-30 | 2021-09-07 | 西北工业大学 | Hot plug interface circuit of CAN bus measurement and control module |
| CN116049068B (en) * | 2023-03-29 | 2023-09-08 | 深圳市湘凡科技有限公司 | Current backflow prevention circuit for USB HUB and method thereof |
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| CN201061142Y (en) * | 2007-04-17 | 2008-05-14 | 海尔集团公司 | Protector for power supply flexible starting instant power off anti-restarting |
| CN201629569U (en) * | 2010-03-18 | 2010-11-10 | 深圳创维－Rgb电子有限公司 | Over-voltage protection circuit of USB interface |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353642C (en) * | 2004-07-31 | 2007-12-05 | 华为技术有限公司 | Method and device of realizing hot plug for power distribution singleboard |
| US7889472B1 (en) * | 2006-10-27 | 2011-02-15 | Nortel Networks Limited | Dual voltage hot swap module power control |
| CN102169334A (en) * | 2011-05-24 | 2011-08-31 | 国网电力科学研究院 | Programmable logic controller supporting hot swap/hot plug |
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- 2011-12-08 CN CN201110405266.0A patent/CN103166166B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201061142Y (en) * | 2007-04-17 | 2008-05-14 | 海尔集团公司 | Protector for power supply flexible starting instant power off anti-restarting |
| CN201629569U (en) * | 2010-03-18 | 2010-11-10 | 深圳创维－Rgb电子有限公司 | Over-voltage protection circuit of USB interface |
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| CN103166166A (en) | 2013-06-19 |
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