CN1505238A - Circuit for preventing DC power supply voltage drop - Google Patents
Circuit for preventing DC power supply voltage drop Download PDFInfo
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- CN1505238A CN1505238A CNA021539766A CN02153976A CN1505238A CN 1505238 A CN1505238 A CN 1505238A CN A021539766 A CNA021539766 A CN A021539766A CN 02153976 A CN02153976 A CN 02153976A CN 1505238 A CN1505238 A CN 1505238A
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- circuit
- power supply
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- discharge
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Abstract
The invention discloses a circuit to resist the voltage drop of DC power supply, including: charging loop, at least composed of current limiting resistor and energy storage capacitor in series and connected between two poles of the power supply; a first diode, connected between the power supply and the charging loop, and when the power supply is low-impedance, used to isolate the charging loop and the power supply; a second diode connected with the above resistor in parallel, when the capacitor discharges, shorting the above resistor; a discharge control loop which is connected between the two poles; discharging loop connected with the charging loop, when the voltage drops, providing discharging loop for the energy storage capacitor under the control of the discharge control loop.
Description
Technical field
The present invention relates to communications field power technology, refer to a kind of circuit of anti-DC power supply electric voltage dropping especially.
Background technology
Along with communication system functionality constantly increases, veneer quantity wherein also constantly increases, and this number of times that makes power supply to the veneer power supply anomaly occur also constantly increases, and DC power supply electric voltage dropping (DIP:DCINTERRUPTION) is wherein common a kind of.
So-called DC power supply electric voltage dropping simply says to be exactly a power down-process that powers on.Cause that the reason of DIP is common load variations, a mains voltage variations etc. in the same electrical network.Power supply fall and the process that re-powers in, also make and cause various problems through regular meeting, as veneer and device power on the order confusion reigned, reset incorrect etc.
At present for solving the normal technology that adopts of DIP problem be: Key Circuit is carried out the supply voltage monitoring, and it is unusual to prevent that under the situation of electric voltage dropping veneer occurs, and can not cause phenomenons such as running software is unusual because voltage monitoring comprehensively.Concrete grammar as:
1. watchdog circuit will be the 5V chip reset to power supply not only, reset signal is provided also will for the chip of other supply power voltages; 2. supply voltage monitoring circuit will be monitored the voltage fluctuation situation of all supply networks on the veneer, and exception can not be arranged; 3. go to guarantee all to provide initialization and verification by board software to all registers, memory.But these methods have following shortcoming:
A, can not solve the electric voltage dropping problem of electric power system, as long as electric power system electric voltage dropping problem exists, the electric voltage dropping phenomenon of equipment and its internal circuit always exists at all;
B, can only carry out suitable remedying, and can not fundamentally prevent the generation of DIP the problem that produces in the DIP process;
C, versatility is poor for the communication equipment of complexity;
D, can not satisfy A level criterion (being undertaken making in the electric voltage dropping test process performance of equipment under test not descend) test request by the IEC61000-4-29 standard code.
Summary of the invention
The invention provides a kind of circuit of anti-DC power supply electric voltage dropping, can not prevent fundamentally that to solve prior art DC power supply from falling the shortcoming that phenomenon occurs in communication equipment.
For addressing the above problem, the circuit of anti-DC power supply electric voltage dropping of the present invention comprises:
Charge circuit is made of current-limiting resistance and energy storage capacitor in series at least, is connected between DC power supply the two poles of the earth;
First diode is connected between power supply and charge circuit, is used to isolate charge circuit and power supply when power end presents Low ESR;
Second diode, in parallel with described current-limiting resistance, when capacitor discharge with this current-limiting resistance short circuit;
Discharge control loop is connected between two poles;
Discharge loop, in parallel with described charge circuit, when supply voltage falls, control this discharge loop by discharge control loop and provide discharge loop for storage capacitor, subsequent conditioning circuit is worked the mischief avoiding.
According to above-mentioned technical scheme:
Described discharge loop is that a resistance and one is constituted by the switch series connection of discharge control loop control.
Described discharge control loop comprises the 3rd diode and the relay of series connection, and the switch in the described discharge loop is a closed contact of this relay.
Described discharge control loop comprises the 3rd diode and the relay of series connection, and the switch in the described discharge loop is a closed contact of this relay.
Also comprise first electric capacity, this first electric capacity is in parallel with described relay.
Also be in series with power supply or voltage protector in described discharge control loop and the charge circuit.
When powering on, described discharge control loop disconnects discharge loop, and power supply charges to storage capacitor through charge circuit, when supply voltage falls, storage capacitor provides power supply to load, and discharge control loop is connected discharge loop simultaneously, for storage capacitor provides discharge loop.
Beneficial effect of the present invention:
(1), circuit structure is simple;
(2), versatility is good for the communication equipment of direct current supply, can be used in-any equipment of direct current supply of 48V power supply;
(3), can satisfy the A level criterion requirement of equipment electric voltage dropping test (normative reference is IEC61000-4-29);
(4), do not need internal circuit is made extra process the harmful effect of avoiding internal circuit hardware and software extra process to cause;
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
With reference to figure 1, the present invention includes:
Charge circuit, its basic structure should comprise the current-limiting resistance R1 and the storage capacitor C2 of series connection, are connected in DC power supply two interpolars, and fuse F1 also connects in this charge circuit.
The first diode D1 is connected between power supply and the charge circuit, is used to prevent that power supply polarity from connecing the anti-harm that causes, and power end is used to isolate charge circuit and power supply when presenting Low ESR.
The second diode D2, R1 is in parallel with current-limiting resistance, when capacitor discharge with this current-limiting resistance R1 short circuit;
Discharge control loop is connected between two poles, comprises the 3rd diode D3, relay J 1 and the fuse F2 of series connection in the present embodiment, and first capacitor C 1 is in parallel with relay.
Discharge loop is made of the series connection of a normally-closed contact of resistance R 1 and relay J 1, and this discharge loop is in parallel with described charge circuit.
During the power supply normal power supply, relay J 1 gets electronic work, and the normally-closed contact in the discharge loop disconnects, and storage capacitor C2 charges, and carries out current limliting by resistance R 1.When electric voltage dropping or interruption, storage capacitor C2 powers a period of time to equipment master operating circuit through the second diode D2, electric voltage dropping or the harmful effect that the circuit of device interior work brought when interrupting when avoiding electric power system, relay J1 dead electricity after electric power system is stopped power supply in addition, its normally-closed contact closure, storage capacitor C2 slowly discharges by normally-closed contact and resistance R 2, works the mischief to avoid subsequent conditioning circuit (or claiming load circuit).The first diode D1 is used on the one hand prevent that power supply polarity from connecing the anti-harm that causes, on the other hand when power end presents Low ESR with charge circuit and isolated from power.The second diode D2 with current-limiting resistance R1 short circuit, influences electric to avoid producing excessive voltage drop on this current-limiting resistance R1 when storage capacitor D2 discharges.The normally-closed contact adhesive of relay J 1 when first capacitor C 1 on the one hand can hold-off voltage be fallen, discharge loop is effective; The impulse disturbances that produces in the time of can moving to normally-closed contact on the other hand absorbs.Fuse F1 and F2 are used for preventing the danger that capacitance short-circuit causes.
Guarantee that electric capacity can discharge enough energy, requiring of the second diode D2 requirements of type selecting and the first diode D1 is identical.
Major parameter requires:
1, the energy in the storage capacitor should satisfy the power supply power down or when falling, keep subsequent conditioning circuit operate as normal a period of time.
2, current-limiting resistance R1 is on the one hand for to guarantee to have after primary voltage falls the enough fast charging interval to recover capacitance energy storage; On the other hand for avoiding the equipment power-on and power-off to produce heavy current impact or the equipment in the same electrical network being exerted an influence.
3, the first diode D1 that selects for use must can satisfy 1.1 times maximum charging current at least.
4, requirement can be the same with the first diode D1 at least for the value of the second diode D2.
5, resistance R 2 mainly influences discharge time, discharge time design want relatively and the charging interval longer, mainly be to consider might quit work owing to the power devices system when electric voltage dropping, the normally-closed contact in the discharge loop is in closure state, and this moment, discharge loop and charge circuit were effective simultaneously.The time constant of discharge loop can be avoided in this case greater than more than 10 times of charge circuit, and the electric voltage dropping protection is not subjected to big influence.
Circuit of the present invention generally can design and installation in the DC power supply input of protected equipment.
Claims (6)
1, a kind of circuit of anti-DC power supply electric voltage dropping is characterized in that comprising:
Charge circuit is made of current-limiting resistance and energy storage capacitor in series at least, is connected between DC power supply the two poles of the earth;
First diode is connected between power supply and charge circuit, is used to isolate charge circuit and power supply when power end presents Low ESR;
Second diode, in parallel with described current-limiting resistance, when capacitor discharge with this current-limiting resistance short circuit;
Discharge control loop is connected between the two poles;
Discharge loop, in parallel with described charge circuit, when supply voltage falls, control this discharge loop by discharge control loop and provide discharge loop for storage capacitor, subsequent conditioning circuit is worked the mischief avoiding.
2, circuit as claimed in claim 1 is characterized in that: described discharge loop is that a resistance and one is constituted by the switch series connection of discharge control loop control.
3, circuit as claimed in claim 2 is characterized in that: described discharge control loop comprises the 3rd diode and the relay of series connection, and the switch in the described discharge loop is a closed contact of this relay.
4, circuit as claimed in claim 3 is characterized in that: also comprise first electric capacity, this first electric capacity is in parallel with described relay.
5,, it is characterized in that also being in series with in the described discharge control loop power supply or voltage protector as the described circuit of one of claim 1 to 4.
6,, it is characterized in that also being in series with in the described charge circuit power supply or voltage protector as the described circuit of one of claim 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021539766A CN1300911C (en) | 2002-12-05 | 2002-12-05 | Circuit for preventing DC power supply voltage drop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021539766A CN1300911C (en) | 2002-12-05 | 2002-12-05 | Circuit for preventing DC power supply voltage drop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1505238A true CN1505238A (en) | 2004-06-16 |
| CN1300911C CN1300911C (en) | 2007-02-14 |
Family
ID=34235392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021539766A Expired - Fee Related CN1300911C (en) | 2002-12-05 | 2002-12-05 | Circuit for preventing DC power supply voltage drop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1300911C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895148A (en) * | 2010-05-25 | 2010-11-24 | 海能达通信股份有限公司 | Dual-power stable-switching device and method |
| CN102377191A (en) * | 2011-11-25 | 2012-03-14 | 烟台华润锦纶有限公司 | Voltage instantaneous fluctuation prevention protector for elasticizer |
| US9172273B2 (en) | 2010-05-25 | 2015-10-27 | Hytera Communications Corp., Ltd. | Smooth switching device and method for double power supplies |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0830360A (en) * | 1994-07-15 | 1996-02-02 | Fanuc Ltd | Power failure backup circuit |
| JPH1014134A (en) * | 1996-06-20 | 1998-01-16 | Sony Corp | Stabilizing power circuit |
| JPH1051978A (en) * | 1996-08-06 | 1998-02-20 | Okuma Mach Works Ltd | Power supply backup circuit |
| FR2756984B1 (en) * | 1996-12-05 | 1999-01-08 | Gec Alsthom Syst Et Serv | EMERGENCY POWER SUPPLY TEMPORARILY FOR A DEFICIENCY OF A MAIN POWER SOURCE |
-
2002
- 2002-12-05 CN CNB021539766A patent/CN1300911C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895148A (en) * | 2010-05-25 | 2010-11-24 | 海能达通信股份有限公司 | Dual-power stable-switching device and method |
| CN101895148B (en) * | 2010-05-25 | 2012-07-04 | 海能达通信股份有限公司 | Dual-power stable-switching device and method |
| US9172273B2 (en) | 2010-05-25 | 2015-10-27 | Hytera Communications Corp., Ltd. | Smooth switching device and method for double power supplies |
| CN102377191A (en) * | 2011-11-25 | 2012-03-14 | 烟台华润锦纶有限公司 | Voltage instantaneous fluctuation prevention protector for elasticizer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1300911C (en) | 2007-02-14 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070214 Termination date: 20191205 |