CN104518486A - Discharge circuit for quickly discharging capacitor after powering off - Google Patents

Discharge circuit for quickly discharging capacitor after powering off Download PDF

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Publication number
CN104518486A
CN104518486A CN201310462020.6A CN201310462020A CN104518486A CN 104518486 A CN104518486 A CN 104518486A CN 201310462020 A CN201310462020 A CN 201310462020A CN 104518486 A CN104518486 A CN 104518486A
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China
Prior art keywords
capacitor
ces
triode
discharge
discharge circuit
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CN201310462020.6A
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Chinese (zh)
Inventor
李永
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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Priority to CN201310462020.6A priority Critical patent/CN104518486A/en
Publication of CN104518486A publication Critical patent/CN104518486A/en
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Abstract

The invention aims to provide a discharge circuit for quickly discharging a capacitor after powering off. The discharge circuit comprises a voltage detection circuit (11) and a current path (12), the voltage detection circuit (11) is used for detecting a voltage value of the capacitor (Ces), and after powering off, when the voltage value of the capacitor (Ces) is lowered to a preset voltage threshold, the current path (12) quickly discharges the capacitor (Ces). Compared with the prior art, the discharge circuit has the advantages that the discharge process of the capacitor in the power-off period is quickened through the specially added discharge circuit, and in the process of normal operation of the circuit corresponding to the capacitor, the discharge circuit serves as an open circuit and cannot share current from the capacitor; after powering off, when the voltage of the capacitor lowers to the preset voltage threshold, the discharge circuit provides the extra current path so as to accelerate the discharge process of the capacitor, and accordingly danger caused by slow discharge of the capacitor is eliminated effectively.

Description

A kind of discharge circuit capacitor being carried out to repid discharge after power-off
Technical field
The present invention relates to communication technical field, particularly relate to a kind of technology for carrying out repid discharge after power-off to capacitor.
Background technology
When electrical power is off, the slower capacitor that discharges can cause damage product device, such as Optical Network Terminal product device.
Usually, comprise several power rail (power rails) in the circuit board, some may have the voltage that 1v, 3.3v are low, and other may have the voltage that 12v, 48v or 72v are high.Capacitor is commonly used to the stability into these power rail ME for maintenance.But when electrical power is off, the voltage on these capacitors needs time enough to be reduced to lsafety level, depend on actual circuit characteristic.Usually, for low-tension supply rail, or with the high voltage source rail that the very short time discharges, be safe from danger, but to other, may danger be caused, such as, damage device, cause the unreliable of system.
If restart power supply again in the short time after power-off, capacitor does not also discharge fully, namely recharges from non-zero status, causes different electrifying timing sequences by not having the capacitor of long enough time powered-down to these.This means that power rail starts power supply by with different sequential, depend on the time of powered-down, and always do not meet designing requirement.In the test process of production, uncharged capacitor may by mistake discharge, and causes product failure, increases cost and causes Product quality and safety problem.
Summary of the invention
The object of this invention is to provide a kind of discharge circuit for carrying out repid discharge after power-off to capacitor.
According to an aspect of the present invention, provide a kind of for after power-off to the discharge circuit that capacitor (Ces) discharges, described discharge circuit comprises voltage detecting circuit (11) and current path (12), wherein, described voltage detecting circuit (11) is configured to the magnitude of voltage detecting described capacitor (Ces), described current path (12) is configured to when after power-off, when the magnitude of voltage of described capacitor (Ces) is down to predetermined voltage threshold, for described capacitor (Ces) discharges.
Preferably, described voltage detecting circuit (11) comprises the first triode (T1) and three resistors (R1, R2, R3); The base stage of described first triode (T1) is connected between two described resistors (R1, R2), the collector electrode of described second triode (T2) is connected to the positive pole of described capacitor (Ces) by described resistor (R3), the emitter of described second triode (T2) is connected to the negative pole of described capacitor (Ces);
Wherein, described current path (12) comprises the second triode (T2) and resistor (R4); The base stage of described second triode (T2) is connected to the collector electrode of described first triode (T1), collector electrode is connected to the positive pole of described capacitor (Ces) by described resistor (R4), and emitter is connected to the emitter of described first triode (T1) and the negative pole of described capacitor (Ces).
Preferably, described first triode (T1) and described second triode (T2) are negative-positive-negative transistor.
Preferably, described voltage detecting circuit (11) also comprises capacitor (C1), and one end of described capacitor (C1) is connected to the base stage of described first triode (T1), and the other end is connected to the positive pole of described capacitor (Ces).
Preferably, described predetermined voltage threshold determined according to the resistance value of described resistor (R1, R2).
Preferably, the capacitance of described capacitor (C1) determined according to the power-on time of the resistance value of described resistor (R1, R2) and described capacitor (Ces) correspondence.
Preferably, described resistor (R4) is configured to repid discharge is carried out in control discharging current to described capacitor (Ces).
Preferably, described discharge circuit is used for optical network unit.
Compared with prior art, the present invention increases special discharge circuit and carrys out the discharge process of speed-up condenser during power-off, and in the normal course of operation of circuit corresponding to this capacitor, this discharge circuit, can not from this capacitor share current as open circuit; When after power-off, when condenser voltage is reduced to a predetermined voltage threshold, this discharge circuit provides extra current path to accelerate this capacitor discharge process, effectively eliminates due to slow the caused danger of capacitor discharge.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 illustrates the circuit theory diagrams for carrying out repid discharge after power-off to capacitor according to one aspect of the invention;
Fig. 2 illustrates the schematic diagram of discharging capacitors after power-off not adopting discharge circuit;
Fig. 3 illustrates the schematic diagram for carrying out repid discharge after power-off to capacitor in accordance with a preferred embodiment of the present invention.
In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 illustrates the circuit theory diagrams for carrying out repid discharge after power-off to capacitor according to one aspect of the invention.
This discharge circuit 1 comprises voltage detecting circuit (11) and current path (12), wherein, described voltage detecting circuit (11) detects the magnitude of voltage of described capacitor (Ces), when after power-off, when the magnitude of voltage of described capacitor (Ces) is down to predetermined voltage threshold, described current path (12) carries out repid discharge for described capacitor (Ces).
Particularly, if not this discharge circuit 1, capacitor (Ces) slowly discharges in power shutdown.During the normal operation circuit that this capacitor (Ces) is corresponding, the voltage of capacitor (Ces) is enough high, does not almost have electric current by this discharge circuit 1.When after power-off, voltage on capacitor (Ces) starts to decline, this voltage detecting circuit (11) detects the magnitude of voltage of this capacitor (Ces), and when this magnitude of voltage drops to predetermined voltage threshold, this current path (12) carries out repid discharge for this capacitor (Ces).
Preferably, described voltage detecting circuit (11) is made up of the first triode (T1) and three resistors (R1, R2, R3); The base stage of described first triode (T1) is connected between two described resistors (R1, R2), and collector electrode is connected to the positive pole of described capacitor (Ces) by described resistor (R3), and emitter is connected to the negative pole of described capacitor (Ces);
Wherein, described current path (12) is made up of the second triode (T2) and resistor (R4); The base stage of described second triode (T2) is connected to the collector electrode of described first triode (T1), collector electrode is connected to the positive pole of described capacitor (Ces) by described resistor (R4), and emitter is connected to the emitter of described first triode (T1) and the negative pole of described capacitor (Ces).
Particularly, during the normal operation circuit that this capacitor (Ces) is corresponding, the voltage of capacitor (Ces) is enough high, the first triode (T1) in voltage detecting circuit (11) is in saturation condition, the second triode (T2) in current path (12) is in cut-off state, does not almost have electric current by this discharge circuit 1.When after power-off, voltage on capacitor (Ces) starts to decline, when it is down to predetermined voltage threshold, the first triode (T1) in voltage detecting circuit (11) becomes cut-off state, the second triode (T2) in current path (12) is saturation condition, resistor (R4) and the second triode (T2) form the discharge path of capacitor (Ces), carry out repid discharge to this capacitor (Ces).
Preferably, described first triode (T1) and described second triode (T2) are negative-positive-negative transistor.
Particularly, negative-positive-negative transistor is made up of three block semiconductors, and wherein two pieces is N type semiconductor, and one piece is P type semiconductor, and P type semiconductor is in centre, and two pieces of N type semiconductors are in both sides.At this, VT is adopted to represent the thermal voltage (thermalvoltage) of this negative-positive-negative transistor.
Connect example, resistor (R4) and the second triode (T2) form the discharge path of capacitor (Ces), repid discharge is carried out to this capacitor (Ces), when this capacitor (Ces) voltage keeps reduce and final close to VT time, this discharge circuit 1 can not work, but the voltage on capacitor (Ces) also can not cause danger.
Preferably, described predetermined voltage threshold determined according to the resistance value of described resistor (R1, R2).
Particularly, according to the resistance value of this resistor (R1, R2), and in conjunction with the thermal voltage VT of this negative-positive-negative transistor, the predetermined voltage threshold of this capacitor (Ces) can be determined according to formula VT* (R1+R2)/R2.When after power-off, when voltage on capacitor (Ces) is down to VT* (R1+R2)/R2, first triode (T1) becomes cut-off state, the second triode (T2) in current path (12) is saturation condition, resistor (R4) and the second triode (T2) form the discharge path of capacitor (Ces), carry out repid discharge to this capacitor (Ces).
Therefore, regulate the resistance value of this resistor (R1, R2) may correspond to and regulate this predetermined voltage threshold, to control the electric discharge of this capacitor (Ces).
Preferably, described voltage detecting circuit (11) also comprises capacitor (C1), and one end of described capacitor (C1) is connected to the base stage of described first triode (T1), and the other end is connected to the positive pole of described capacitor (Ces).
Particularly, suppose that this voltage detecting circuit (11) does not introduce this capacitor (C1), then this discharge circuit 1 also can shunt current when electric power starting, and this not wants.When after this capacitor of use (C1), when electric power starting, voltage threshold will greatly reduce, and discharging current will be eliminated effectively.
Preferably, the capacitance of described capacitor (C1) determined according to the power-on time of the resistance value of described resistor (R1, R2) and described capacitor (Ces) correspondence.
Particularly, the capacitance of this capacitor (C1) should be too not large, if this capacitance is too large, then after power-off, will there is electric discharge behavior in this discharge circuit immediately, make predetermined voltage threshold to be defined as that VT* (R1+R2)/R2 is nonsensical, further, make system stable not.Therefore, consider that the time of electric power starting is always far smaller than the time of power-off, can select suitable R1, R2 and C1 with make (R1//R2) * C1 and power-on time similar.
Preferably, described resistor (R4) controls the discharging current described capacitor (Ces) being carried out to repid discharge.
Particularly, in current path (12), regulate the resistance value of this resistor (R4), correspondingly can regulate the discharging current this capacitor (Ces) being carried out to repid discharge.Accelerate the velocity of discharge if want, that is, increase the electric current of this current path (12), then select the resistor (R4) that a resistance value is less, slow down the velocity of discharge if want, then select the resistor (R4) that a resistance value is larger.
At this, for different embody rule, the resistor (R1, R2, R3, R4) of appropriate resistance can be selected, select the capacitor (C1) of appropriate electrical capacitance, and select suitable transistor.
Preferably, described discharge circuit is used for optical network unit (Optical NetworkTerminal).
Particularly, for optical network unit, when electrical power is off, the product device that the slower capacitor that discharges can cause damaging wherein.Optical network unit like product comprises several power rail usually in the circuit board, and some may have the voltage that 1v, 3.3v are low, and other may have the voltage that 12v, 48v or 72v are high.Capacitor is commonly used to the stability into these power rail ME for maintenance.But when electrical power is off, the voltage on these capacitors needs time enough to be reduced to lsafety level, depend on actual circuit characteristic.Usually, for low-tension supply rail, or with the high voltage source rail that the very short time discharges, be safe from danger, but to other, may danger be caused, such as, damage device, cause the unreliable of system.If restart power supply again in the short time after power-off, capacitor does not also discharge fully, namely recharges from non-zero status, causes different electrifying timing sequences by not having the capacitor of long enough time powered-down to these.This means that power rail starts power supply by with different sequential, depend on the time of powered-down, and always do not meet designing requirement.In the test process of production, uncharged capacitor may by mistake discharge, and causes product failure, increases cost and causes Product quality and safety problem.
Therefore, in optical network unit, adopt this discharge circuit 1, make capacitor accelerate discharge process during power-off, in the normal course of operation of circuit corresponding to this capacitor, this discharge circuit 1, can not from this capacitor share current as open circuit; When after power-off, when condenser voltage is reduced to a predetermined voltage threshold, this discharge circuit 1 provides extra current path to accelerate this capacitor discharge process, effectively eliminates due to slow the caused danger of capacitor discharge.
Fig. 2 illustrates the schematic diagram of discharging capacitors after power-off not adopting discharge circuit.
As shown in Figure 2, suppose that the circuit that capacitor (Ces) is corresponding does not adopt discharge circuit, then, after power-off, this capacitor (Ces) electric discharge slowly.After the magnitude of voltage of this capacitor (Ces) is reduced to predetermined voltage threshold, this sentences Vth and represents, the magnitude of voltage of this capacitor (Ces) then reduces with slowly speed, and namely this capacitor (Ces) discharges with slowly speed.
Fig. 3 illustrates the schematic diagram for carrying out repid discharge after power-off to capacitor in accordance with a preferred embodiment of the present invention.
As shown in Figure 3, the circuit that now this capacitor (Ces) is corresponding have employed this discharge circuit, then after power-off, after the magnitude of voltage of this capacitor (Ces) is reduced to predetermined voltage threshold (Vth), the magnitude of voltage of this capacitor (Ces) quickly reduces, and namely this capacitor (Ces) quickly discharges.
It should be noted that the present invention can be implemented in the assembly of software and/or software restraint, such as, application-specific integrated circuit (ASIC) (ASIC), general object computer or any other similar hardware device can be adopted to realize.In one embodiment, software program of the present invention can perform to realize step mentioned above or function by processor.Similarly, software program of the present invention (comprising relevant data structure) can be stored in computer readable recording medium storing program for performing, such as, and RAM memory, magnetic or CD-ROM driver or floppy disc and similar devices.In addition, steps more of the present invention or function can adopt hardware to realize, such as, as coordinating with processor thus performing the circuit of each step or function.
In addition, a part of the present invention can be applied to computer program, such as computer program instructions, when it is performed by computer, by the operation of this computer, can call or provide according to method of the present invention and/or technical scheme.And call the program command of method of the present invention, may be stored in fixing or moveable recording medium, and/or be transmitted by the data flow in broadcast or other signal bearing medias, and/or be stored in the working storage of the computer equipment run according to described program command.At this, comprise a device according to one embodiment of present invention, this device comprises the memory for storing computer program instructions and the processor for execution of program instructions, wherein, when this computer program instructions is performed by this processor, trigger this plant running based on the aforementioned method according to multiple embodiment of the present invention and/or technical scheme.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.In addition, obviously " comprising " one word do not get rid of other unit or step, odd number does not get rid of plural number.Multiple unit of stating in device claim or device also can be realized by software or hardware by a unit or device.First, second word such as grade is used for representing title, and does not represent any specific order.

Claims (8)

1. one kind for after power-off to the discharge circuit that capacitor (Ces) discharges, described discharge circuit comprises voltage detecting circuit (11) and current path (12), wherein, described voltage detecting circuit (11) is configured to the magnitude of voltage detecting described capacitor (Ces), described current path (12) is configured to when after power-off, when the magnitude of voltage of described capacitor (Ces) is down to predetermined voltage threshold, for described capacitor (Ces) discharges.
2. discharge circuit according to claim 1, wherein, described voltage detecting circuit (11) comprises the first triode (T1) and three resistors (R1, R2, R3); The base stage of described first triode (T1) is connected between two described resistors (R1, R2), and collector electrode is connected to the positive pole of described capacitor (Ces) by described resistor (R3), and emitter is connected to the negative pole of described capacitor (Ces);
Wherein, described current path (12) comprises the second triode (T2) and resistor (R4); The base stage of described second triode (T2) is connected to the collector electrode of described first triode (T1), the collector electrode of described second triode (T2) is connected to the positive pole of described capacitor (Ces) by described resistor (R4), the emitter of described second triode (T2) is connected to the emitter of described first triode (T1) and the negative pole of described capacitor (Ces).
3. discharge circuit according to claim 2, wherein, described first triode (T1) and described second triode (T2) are negative-positive-negative transistor.
4. the discharge circuit according to Claims 2 or 3, wherein, described voltage detecting circuit (11) also comprises capacitor (C1), and one end of described capacitor (C1) is connected to the base stage of described first triode (T1), and the other end is connected to the positive pole of described capacitor (Ces).
5. discharge circuit according to claim 2, wherein, described predetermined voltage threshold determined according to the resistance value of described resistor (R1, R2).
6. the discharge circuit according to claim 4 or 5, wherein, the capacitance of described capacitor (C1) determined according to the power-on time of the resistance value of described resistor (R1, R2) and described capacitor (Ces) correspondence.
7. discharge circuit according to claim 2, wherein, described resistor (R4) is configured to the discharging current controlling described capacitor (Ces) to be carried out to repid discharge.
8. discharge circuit according to any one of claim 1 to 7, wherein, described discharge circuit is used for optical network unit.
CN201310462020.6A 2013-09-30 2013-09-30 Discharge circuit for quickly discharging capacitor after powering off Pending CN104518486A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105529905A (en) * 2015-11-26 2016-04-27 艾德克斯电子(南京)有限公司 DC power supply with rapid power releasing function and power releasing equipment thereof
WO2017219737A1 (en) * 2016-06-21 2017-12-28 深圳市九洲电器有限公司 Discharge circuit and discharge method for set-top box during poweroff
CN107910913A (en) * 2017-11-24 2018-04-13 卫星电子(中山)有限公司 A kind of slow discharge circuit of DC power supply output
CN112039042A (en) * 2020-08-28 2020-12-04 Oppo(重庆)智能科技有限公司 Discharge circuit and electronic device
WO2023061333A1 (en) * 2021-10-12 2023-04-20 维沃移动通信有限公司 Bleeder circuit control method and apparatus, bleeder device, and electronic device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2791993Y (en) * 2005-03-25 2006-06-28 刘树林 Capacitance sort circuit spark energy release device
CN201038776Y (en) * 2007-03-23 2008-03-19 胡琨 Quick discharger for capacitor
CN201854094U (en) * 2010-09-27 2011-06-01 天津市松正电动科技有限公司 Automatic discharging circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2791993Y (en) * 2005-03-25 2006-06-28 刘树林 Capacitance sort circuit spark energy release device
CN201038776Y (en) * 2007-03-23 2008-03-19 胡琨 Quick discharger for capacitor
CN201854094U (en) * 2010-09-27 2011-06-01 天津市松正电动科技有限公司 Automatic discharging circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105529905A (en) * 2015-11-26 2016-04-27 艾德克斯电子(南京)有限公司 DC power supply with rapid power releasing function and power releasing equipment thereof
CN105529905B (en) * 2015-11-26 2018-09-14 艾德克斯电子(南京)有限公司 The DC power supply and power discharge equipment of playing function are unloaded with fast power
WO2017219737A1 (en) * 2016-06-21 2017-12-28 深圳市九洲电器有限公司 Discharge circuit and discharge method for set-top box during poweroff
CN107910913A (en) * 2017-11-24 2018-04-13 卫星电子(中山)有限公司 A kind of slow discharge circuit of DC power supply output
CN112039042A (en) * 2020-08-28 2020-12-04 Oppo(重庆)智能科技有限公司 Discharge circuit and electronic device
CN112039042B (en) * 2020-08-28 2022-09-02 Oppo(重庆)智能科技有限公司 Discharge circuit and electronic device
WO2023061333A1 (en) * 2021-10-12 2023-04-20 维沃移动通信有限公司 Bleeder circuit control method and apparatus, bleeder device, and electronic device

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Application publication date: 20150415