CN1300911C - Circuit for preventing DC power supply voltage drop - Google Patents
Circuit for preventing DC power supply voltage drop Download PDFInfo
- Publication number
- CN1300911C CN1300911C CNB021539766A CN02153976A CN1300911C CN 1300911 C CN1300911 C CN 1300911C CN B021539766 A CNB021539766 A CN B021539766A CN 02153976 A CN02153976 A CN 02153976A CN 1300911 C CN1300911 C CN 1300911C
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- power supply
- circuit
- diode
- discharge
- loop
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Abstract
The present invention discloses a circuit for preventing DC power supply voltage drop, which comprises a charging circuit, a first diode, a second diode, a discharge control circuit and a discharging circuit, wherein the charging circuit is at least composed of a current limiting resistor and a storage capacitor which are connected in series, and is connected to the space between two poles of a DC power supply; the first diode is connected to the space between the power supply and the charging circuit and is used for separating the charging circuit and the power supply when low impedance of the power supply end appears; the second diode is connected in parallel to the current limiting resistor and is used for the short circuit of the current limiting resistor when a capacitor discharges; the discharge control circuit is connected to the space between the two poles of the power supply; the discharging circuit is connected in parallel to the charging circuit, and the discharge control circuit is used for controlling the discharging circuit to provide discharge circuits to the storage capacitor when the power supply voltage falls. The present invention has the characteristics of simple structure, good versatility, etc.
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 DC power supply and charge circuit, is used to isolate charge circuit and DC power supply when dc power supply terminal presents Low ESR;
Second diode, in parallel with described current-limiting resistance, when storage capacitor discharges with this current-limiting resistance short circuit;
Discharge control loop is connected in DC power supply two interpolars;
Discharge loop, in parallel with described charge circuit, during the DC power supply electric voltage dropping, 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 by resistance and 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 the 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 the 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 DC 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 DC power supply is charged to storage capacitor through charge circuit, during the DC power supply electric voltage dropping, storage capacitor provides DC 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 DC power supply and the charge circuit, is used to prevent that power supply polarity from connecing the anti-harm that causes, and dc power supply terminal is used to isolate charge circuit and DC power supply when presenting Low ESR.
The second diode D2, R1 is in parallel with current-limiting resistance, when storage capacitor discharges with this current-limiting resistance R1 short circuit;
Discharge control loop is connected in DC power supply two interpolars, 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 DC 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, and when dc power supply terminal presents Low ESR charge circuit and DC power supply is isolated on the other hand.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 C2 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 DC power supply and charge circuit, is used to isolate charge circuit and DC power supply when dc power supply terminal presents Low ESR;
Second diode, in parallel with described current-limiting resistance, when storage capacitor discharges with this current-limiting resistance short circuit;
Discharge control loop is connected between DC power supply the two poles of the earth;
Discharge loop, in parallel with described charge circuit, during the DC power supply electric voltage dropping, 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 by resistance and 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 the 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 DC 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 DC 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 CN1505238A (en) | 2004-06-16 |
| CN1300911C true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011147076A1 (en) | 2010-05-25 | 2011-12-01 | 海能达通信股份有限公司 | Smooth switching device and method for double power supplies |
| 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 |
| 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 |
Citations (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 |
| US6121694A (en) * | 1996-12-05 | 2000-09-19 | Alcatel | Back-up power supply serving to compensate temporarily for main power supply deficiency |
-
2002
- 2002-12-05 CN CNB021539766A patent/CN1300911C/en not_active Expired - Fee Related
Patent Citations (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 |
| US6121694A (en) * | 1996-12-05 | 2000-09-19 | Alcatel | Back-up power supply serving to compensate temporarily for main power supply deficiency |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1505238A (en) | 2004-06-16 |
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Granted publication date: 20070214 Termination date: 20191205 |
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| CF01 | Termination of patent right due to non-payment of annual fee |