CN103580272A - Time-delay circuit for outage of power source - Google Patents
Time-delay circuit for outage of power source Download PDFInfo
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- CN103580272A CN103580272A CN201310572358.7A CN201310572358A CN103580272A CN 103580272 A CN103580272 A CN 103580272A CN 201310572358 A CN201310572358 A CN 201310572358A CN 103580272 A CN103580272 A CN 103580272A
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Abstract
The invention provides a time-delay circuit for an outage of a power source. The time-delay circuit for the outage of the power source comprises a boost module, an energy storage capacitor, a voltage detection module, an energy storage switch and a direct current-direct current power source conversion module, wherein the boost module is used for boosting an input direct-current power source, the energy storage capacitor is connected with the boost module, the voltage detection module is used for detecting input voltage of the input direct-current power source, the energy storage switch is used for releasing the energy storage capacitor, and the direct current-direct current power source conversion module is connected with the energy storage switch and the direct-current power source. When the a power source detection module detects that the outage of the input direct-current power source occurs, the power source detection module controls the boost module to be closed and controls the energy storage switch to be closed so that the energy storage capacitor can provide electricity for the direct current-direct current power source conversion module. The time-delay circuit for the outage of the power source has the advantages of being small in size and low in cost.
Description
Technical field
The present invention relates to field of power supplies, relate in particular to a kind of power cut-off delay circuit.
Background technology
The DYING GASP function of power supply is dying words, while referring to power remove, to higher level's communication equipment, reports relevant information, keeps the time of 20ms left and right after General Requirements power-off, maintains during this period of time to different functional circuits; There is at present 5V or the power supply of low-voltage more for a lot of communication products.In order to realize DYING GASP function, industry generally adopts super capacitor (farad level electric capacity), or with the Capacitance parallel connection of a lot of several thousand uf, realizes the function of DYING GASP; The internal temperature of some equipment own is very high, need to find the super capacitor of high temperature resistant (more than 105 degree), and existing market does not have this electric capacity substantially; Use the Capacitance parallel connection of a plurality of several thousand uf to account for very much again the area of pcb board, and cost is higher; Ancestor of the present invention aims to provide energy storage program under low-voltage input power, improve the utilance of capacitance energy storage, extend the time working after system power failure, thereby extend on DYING GASP, call time, reduce to greatest extent capacity and the quantity of storage capacitor, finally reduce volume, reduce cost.
Summary of the invention
In order to solve the problems referred to above of prior art, be necessary to provide the power cut-off that a kind of volume is little, cost is low delay circuit.
The technical scheme that technical solution problem of the present invention provides is:
A delay circuit, it comprises: for the boost module that input DC power is boosted; The storage capacitor being connected with described boost module; Voltage detection module for detection of input DC power input voltage; For discharging the energy storage switch of storage capacitor; The DC-DC power modular converter being connected with DC power supply with energy storage switch; When described power supply detection module detects input DC power power-off, it is controlled described boost module and closes and described energy storage switch conduction, thereby make described storage capacitor, is described DC-DC power modular converter power supply.
Wherein, described power cut-off delay circuit further comprises diode, and the positive pole of described diode is connected with input DC power, and the negative pole of described diode is connected with described DC-DC power modular converter with described boost module.
Wherein, described power cut-off delay circuit further comprises the filter capacitor being arranged between described diode negative pole and ground wire.
Wherein, described power cut-off delay circuit further comprises the current-limiting resistance being arranged between described boost module and storage capacitor.
Wherein, described voltage detection module adopts voltage checking chip ADM706SAR.
Wherein, described boost module adopts the chip SY7208 that boosts.
Compared with prior art, power cut-off delay circuit of the present invention, adopt boost module to boost to storage capacitor, solve the lower not high problem of capacitance energy storage efficiency of low pressure input, extend the time working after system power failure, thereby realized the delay function after power-off, met system and report the required time of DYING GASP.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the power cut-off delay circuit of one embodiment of the present invention.
Embodiment
The present invention is under a kind of LVPS is inputted, and utilizes boost module to solve the lower not high problem of capacitance energy storage efficiency of low-tension supply input in conjunction with voltage detection module and storage capacitor, the function of normal working hours after realization prolongation system power failure; The input supply voltage of take is introduced the operation principle of whole block diagram as 5V as example.
As Fig. 1, the power cut-off delay circuit of one embodiment of the present invention comprises voltage detection module, boost module, energy storage switch, DC-DC power modular converter, circuit board, diode D1, current-limiting resistance R1, filter capacitor C1 and storage capacitor C2.Voltage detection module is connected with input DC power, for detection of the state of direct-current input power supplying.The positive pole of diode D1 is connected with direct-current input power supplying, and negative pole is connected with boost module.One end of filter capacitor is connected with the negative pole of diode D1, other end ground connection.One end ground connection of storage capacitor C2, the other end is connected with energy storage switch respectively and is connected with boost module by current-limiting resistance R1.Energy storage switch is connected with DC-DC power modular converter.
Boost module can adopt the chip SY7208 that boosts, the utilization chip that boosts is realized the 4.7V voltage (diode drop 0.3V) come from diode D1 and is boosted to 13V, then give storage capacitor C2 charging. voltage detection module adopts voltage checking chip ADM706SAR, utilizes the voltage comparator that chip carries to realize the function that detects input power power down; Input DC power voltage is exported high level index signal normal hour; When 5V starts after power down, voltage detection module monitors lower voltage to certain threshold value, output low level index signal, thereby the work of control energy storage switch and the chip that boosts.
The level indicating signal controlling that energy storage switch is exported by voltage detection module.When input DC power is opened, diode D1 opens, and storage capacitor starts charging until be full of electricity, and the level indicating signal of voltage detection module output is simultaneously high level, and the path between the High voltage output of boost module and low pressure input disconnects; When input power starts power down, voltage checking chip detects 5V power supply power-fail, the output of output level index signal becomes low level, the chip SY7208 that simultaneously will boost cuts off, diode D1 turn-offs the effect of having played reverse-filling, and storage capacitor starts to the power supply of DC-DC power modular converter, makes to extend output to the power supply of whole plate power supply, thereby the time working after prolongation system power failure, meet system and report the required time of DYING GASP.
The capacitance computing formula of storage capacitor is as follows:
Wherein: C: capacitor's capacity; P: system rated disspation; On t:DYING GASP, call time; V1: give the DC-DC power modular converter input voltage maximum of whole plate power supply, be added in the maximum voltage value on storage capacitor; V2: the DC-DC power modular converter input voltage minimum value of giving whole plate power supply.
For example input power is 5V, veneer rated disspation 10W, more than calling time on DYING GASP and generally needing 20ms, giving the minimum input voltage of the power supply chip of whole plate power supply is 3.5V, according to above-mentioned formula, calculate, if used conventional methods, directly on input power 5V, add storage capacitor, need the electric capacity of 0.0283F; If employing the solution of the present invention, 5V input power is raised to 13V to charge to storage capacitor again, utilize and promote the utilance that pressure reduction improves capacitance energy storage, only need the electric capacity of 2530uF, only need an electric capacity, reduce to greatest extent capacity and the quantity of storage capacitor, finally reduce volume, reduce cost.
Compared with prior art, power cut-off delay circuit of the present invention, adopt boost module to boost to storage capacitor, solve the lower not high problem of capacitance energy storage efficiency of low pressure input, extend the time working after system power failure, thereby realized the delay function after power-off, met system and report the required time of DYING GASP.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. a power cut-off delay circuit, is characterized in that, comprising:
For the boost module that input DC power is boosted;
The storage capacitor being connected with described boost module;
Voltage detection module for detection of input DC power input voltage;
For discharging the energy storage switch of storage capacitor;
The DC-DC power modular converter being connected with DC power supply with energy storage switch;
When described power supply detection module detects input DC power power-off, it is controlled described boost module and closes and described energy storage switch conduction, thereby make described storage capacitor, is described DC-DC power modular converter power supply.
2. power cut-off delay circuit according to claim 1, it is characterized in that, further comprise diode, the positive pole of described diode is connected with input DC power, and the negative pole of described diode is connected with described DC-DC power modular converter with described boost module.
3. power cut-off delay circuit according to claim 1, is characterized in that, further comprises the filter capacitor being arranged between described diode negative pole and ground wire.
4. power cut-off delay circuit according to claim 1, is characterized in that, further comprises the current-limiting resistance being arranged between described boost module and storage capacitor.
5. power cut-off delay circuit according to claim 1, described voltage detection module adopts voltage checking chip ADM706SAR.
6. power cut-off delay circuit according to claim 1, described boost module adopts the chip SY7208 that boosts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310572358.7A CN103580272A (en) | 2013-11-15 | 2013-11-15 | Time-delay circuit for outage of power source |
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| CN201310572358.7A CN103580272A (en) | 2013-11-15 | 2013-11-15 | Time-delay circuit for outage of power source |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269842A (en) * | 2014-09-09 | 2015-01-07 | 株洲变流技术国家工程研究中心有限公司 | Direct-current supply device of control system |
| CN104578262A (en) * | 2014-12-22 | 2015-04-29 | 惠州市亿能电子有限公司 | Power supply circuit for automatic delay power delivery of BMS |
| CN105846541A (en) * | 2016-05-23 | 2016-08-10 | 国神光电科技（上海）有限公司 | Power-down protection circuit |
| WO2016201603A1 (en) * | 2015-06-15 | 2016-12-22 | 华为技术有限公司 | Power-down alarming circuit and network device |
| CN106780832A (en) * | 2016-11-25 | 2017-05-31 | 陕西千山航空电子有限责任公司 | A kind of protection type audio frequency and video composite record device |
| CN107819349A (en) * | 2016-09-13 | 2018-03-20 | 南京中兴软件有限责任公司 | SFP energy storage method, device, system and SFP |
| CN110798085A (en) * | 2019-11-14 | 2020-02-14 | 青岛航天半导体研究所有限公司 | Improved input voltage circuit |
| CN112018835A (en) * | 2019-05-28 | 2020-12-01 | 株式会社牧田 | Electric working machine |
| US11081959B2 (en) | 2019-10-31 | 2021-08-03 | Chicony Power Technology Co., Ltd. | Power conversion device |
| CN113315360A (en) * | 2021-05-07 | 2021-08-27 | 北京军陶科技有限公司 | Anti-transient-outage power supply and equipment based on capacitor boosting energy storage |
| CN113659819A (en) * | 2021-07-08 | 2021-11-16 | 广州金升阳科技有限公司 | Power-down delay control method and control circuit |
| CN113948331A (en) * | 2021-10-14 | 2022-01-18 | 深圳市联洲国际技术有限公司 | Push type switch and communication equipment |
| CN114442785A (en) * | 2021-12-30 | 2022-05-06 | 苏州浪潮智能科技有限公司 | Method and system for prolonging output holding time of server power supply |
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| CN202696263U (en) * | 2012-04-20 | 2013-01-23 | 中兴通讯股份有限公司 | Power-down holding circuit and master control apparatus |
| CN103036686A (en) * | 2012-12-10 | 2013-04-10 | 上海斐讯数据通信技术有限公司 | Network terminal and circuit thereof capable of achieving report of power down information |
| CN202889195U (en) * | 2012-09-29 | 2013-04-17 | 深圳市新国都技术股份有限公司 | Control circuit prolonging power fail protection time |
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| CN202696263U (en) * | 2012-04-20 | 2013-01-23 | 中兴通讯股份有限公司 | Power-down holding circuit and master control apparatus |
| CN202889195U (en) * | 2012-09-29 | 2013-04-17 | 深圳市新国都技术股份有限公司 | Control circuit prolonging power fail protection time |
| CN103036686A (en) * | 2012-12-10 | 2013-04-10 | 上海斐讯数据通信技术有限公司 | Network terminal and circuit thereof capable of achieving report of power down information |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269842A (en) * | 2014-09-09 | 2015-01-07 | 株洲变流技术国家工程研究中心有限公司 | Direct-current supply device of control system |
| CN104269842B (en) * | 2014-09-09 | 2016-12-07 | 株洲变流技术国家工程研究中心有限公司 | A kind of DC power supply apparatus of control system |
| CN104578262A (en) * | 2014-12-22 | 2015-04-29 | 惠州市亿能电子有限公司 | Power supply circuit for automatic delay power delivery of BMS |
| WO2016201603A1 (en) * | 2015-06-15 | 2016-12-22 | 华为技术有限公司 | Power-down alarming circuit and network device |
| CN107005080A (en) * | 2015-06-15 | 2017-08-01 | 华为技术有限公司 | A kind of power failure warning circuit and the network equipment |
| CN107005080B (en) * | 2015-06-15 | 2020-10-27 | 华为技术有限公司 | Power failure warning circuit and network equipment |
| CN105846541A (en) * | 2016-05-23 | 2016-08-10 | 国神光电科技（上海）有限公司 | Power-down protection circuit |
| CN107819349A (en) * | 2016-09-13 | 2018-03-20 | 南京中兴软件有限责任公司 | SFP energy storage method, device, system and SFP |
| CN107819349B (en) * | 2016-09-13 | 2023-09-05 | 中兴通讯股份有限公司 | Energy storage method, device and system of SFP ONU optical module |
| CN106780832A (en) * | 2016-11-25 | 2017-05-31 | 陕西千山航空电子有限责任公司 | A kind of protection type audio frequency and video composite record device |
| CN112018835A (en) * | 2019-05-28 | 2020-12-01 | 株式会社牧田 | Electric working machine |
| US11081959B2 (en) | 2019-10-31 | 2021-08-03 | Chicony Power Technology Co., Ltd. | Power conversion device |
| CN110798085A (en) * | 2019-11-14 | 2020-02-14 | 青岛航天半导体研究所有限公司 | Improved input voltage circuit |
| CN113315360A (en) * | 2021-05-07 | 2021-08-27 | 北京军陶科技有限公司 | Anti-transient-outage power supply and equipment based on capacitor boosting energy storage |
| CN113659819A (en) * | 2021-07-08 | 2021-11-16 | 广州金升阳科技有限公司 | Power-down delay control method and control circuit |
| CN113659819B (en) * | 2021-07-08 | 2023-01-17 | 广州金升阳科技有限公司 | Power-down delay control method and control circuit |
| CN113948331A (en) * | 2021-10-14 | 2022-01-18 | 深圳市联洲国际技术有限公司 | Push type switch and communication equipment |
| CN113948331B (en) * | 2021-10-14 | 2023-12-22 | 成都市联洲国际技术有限公司 | Push type switch and communication equipment |
| CN114442785A (en) * | 2021-12-30 | 2022-05-06 | 苏州浪潮智能科技有限公司 | Method and system for prolonging output holding time of server power supply |
| CN114442785B (en) * | 2021-12-30 | 2023-07-18 | 苏州浪潮智能科技有限公司 | Output holding time extension method and system for server power supply |
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Application publication date: 20140212 |