CN201181903Y - Input circuit of DC power supply - Google Patents
Input circuit of DC power supply Download PDFInfo
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- CN201181903Y CN201181903Y CNU2008200056543U CN200820005654U CN201181903Y CN 201181903 Y CN201181903 Y CN 201181903Y CN U2008200056543 U CNU2008200056543 U CN U2008200056543U CN 200820005654 U CN200820005654 U CN 200820005654U CN 201181903 Y CN201181903 Y CN 201181903Y
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Abstract
The utility model provides an input circuit for a direct-current power supply, which comprises a reverse polarity prevention circuit and a delay startup circuit which are connected with each other and connected with a direct-current power supply and then a later stage of filter circuit and a secondary power supply. The input circuit for a direct-current power supply not only has a reverse polarity prevention function but also has a delay startup function.
Description
Technical field
The utility model relates to the communications field, in particular to a kind of input circuit of DC power supply.
Background technology
Telecommunication platform generally adopts a plurality of veneers and the structure of backboard to inserting at present, and its power distribution also generally adopts DPS (distributed) framework.Because distributed power source, veneer need be linked into veneer to 48V bus power supply (or power supply of other electric pressures) from backboard, becomes low-voltages such as 12V, 5V, 3.3V, 2.5V to use for chip through giving the secondary power supply module converts after the filtering.In the process of Board Power up or plug, because the existence of bus filter capacitor or secondary power supply modular power source input side filter capacitor can produce very big current spike, big starting current tends to influence the operate as normal of veneer, makes the damage of major loop switching tube overpower or makes fuse damage easily.In addition, in the maintenance and operation process, electric power polarity can cause damage to veneer components and parts or system after connecing instead at the scene.Therefore, along with present telecommunication apparatus increases day by day for single-plate grade and system-level reliability, requirement to one-board power supply is also more and more higher, require one-board power supply to have that anti-reverse, input is slow to start, improve function such as EMC, need provide a cover one-board power supply to import the total solution of anti-reverse gentle startup.
The realization of reverse-connection preventing circuit is fairly simple, can realize with the electric elements of band polarity such as diode, and Fig. 1 shows a kind of reverse-connection preventing circuit of routine.E wherein is back level filter circuit and the secondary power supply on the veneer.This reverse-connection preventing circuit is used to prevent direct-current input power supplying reversal connection mistakenly.
Prior art generally has two kinds of methods for the soft-start circuit of direct-current input power supplying.A kind of is to adopt special-purpose hot plug control chip.The major loop switching tube is controlled opens and realizes hot plug though this method can be controlled, and in the process that realizes, needs some peripheral discrete devices of design to realize that the trickle charge of power supplys puts soon, and this has increased complexity from design; In addition, aspect cost consideration, adopt desirable selection that integrated control chip neither telecom equipment manufacturers.
Another kind is realized the slow circuit that starts of input as shown in Figure 2 with discrete component, by G at major loop MOSFET, capacitor C 1 in parallel between the S utmost point, when powering on, power supply passes through R3, the RC charge circuit of the composition of C1 charges to C1, and C1 voltage slowly rises by index law, thereby realizes that MOSFET's is slowly open-minded.In addition, in the prior art MOSFET G utmost point and S electric capacity extremely in parallel has been done some improvement, as at G, a plurality of electric capacity in parallel between S, by G in the extra switching circuit control opening process, the capacitance between S makes G, and the voltage between S rises near linear.
In realizing the utility model process, the designer finds that input separately designs anti-reverse and soft-start circuit to prior art for one-board power supply, lacks circuit integratedly to finish a complete power supply input solution to these two kinds together.That is, often have only the reversal connection circuit, do not have soft-start circuit, perhaps have only soft-start circuit, and do not have reverse-connection preventing circuit.These circuit have just been realized the anti-reverse or soft start function of power supply respectively separately.But when practical application, when needs considered that two functions realize simultaneously, originally the circuit of design had become inapplicable or need change on original circuit separately.
The utility model content
The utility model aims to provide a kind of input circuit of DC power supply, can not have the problem of slow startup and anti-DC power supply reversal connection function simultaneously with the input circuit that solves DC power supply.
In embodiment of the present utility model, a kind of input circuit of DC power supply is provided, comprising: interconnective reverse-connection preventing circuit and soft-start circuit, it inserts DC power supply, and is connected to back level filter circuit and secondary power supply.
Preferably, reverse-connection preventing circuit is the diode VD2 that is just connecing with respect to DC power supply; Soft-start circuit specifically comprises: field effect transistor VT1, capacitor C 1, voltage stabilizing didoe VD1, resistance R 3, resistance R 4, resistance R 5; Wherein, the grid of field effect transistor VT1 connects after the resistance R 5, is connected in parallel to capacitor C 1 with its source electrode, is connected in parallel to the voltage stabilizing didoe VD1 with respect to the DC power supply reversal connection, and is connected in parallel to resistance R 4; More than the gate terminal of the parallel circuits of Gou Chenging is connected with resistance R 3, is connected to the positive pole of DC power supply and first end of back level filter circuit and secondary power supply, and the source terminal of parallel circuits is connected to the negative pole of DC power supply; The drain electrode end of field effect transistor VT1 is connected to second end of back level filter circuit and secondary power supply.
Preferably, reverse-connection preventing circuit is arranged between the source terminal of the negative pole of DC power supply and parallel circuits.
Preferably, reverse-connection preventing circuit is arranged between second end of the drain electrode end of field effect transistor VT1 and back level filter circuit and secondary power supply.
Preferably, reverse-connection preventing circuit is arranged between first end of resistance R 3 and back level filter circuit and secondary power supply.
Preferably, reverse-connection preventing circuit is arranged at soft-start circuit inside.
Preferably, reverse-connection preventing circuit is arranged between the source electrode of the positive pole of the voltage stabilizing didoe VD1 in the parallel circuits and field effect transistor VT1.
Preferably, input circuit also comprises bleeder circuit and puts back to the road soon; Wherein, bleeder circuit comprises the resistance R 1 and the resistance R 2 of series connection, and resistance R 1 is connected to the positive pole of DC power supply, and resistance R 2 is connected to the negative pole of DC power supply; Put back to the road soon and comprise triode VT2, the base stage of triode VT2 and collector electrode are in parallel with resistance R 2, and its emitter is connected to the P2 point of parallel circuits, and its collector electrode is connected to the P3 point of parallel circuits.
Because the utility model has comprised reversal connection circuit and soft-start circuit simultaneously, thus overcome the problem that the input circuit of DC power supply can not have slow startup and anti-DC power supply reversal connection function simultaneously, thus existing anti-reverse function has soft start function again.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 shows a kind of schematic diagram of reverse-connection preventing circuit of routine;
Fig. 2 shows a kind of schematic diagram of soft-start circuit of routine;
Fig. 3 is the schematic diagram of the input circuit embodiment 1 of the utility model DC power supply;
Fig. 4 is the circuit diagram of the input electricity embodiment 2 of the utility model DC power supply;
Fig. 5 is the circuit diagram of the input circuit embodiment 3 of the utility model DC power supply.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
As shown in Figure 3, the input circuit of the utility model DC power supply comprises: interconnective reverse-connection preventing circuit 102 and soft-start circuit 103, it inserts DC power supply 101, and is connected to back level filter circuit and secondary power supply 104.
Because present embodiment has comprised reversal connection circuit and soft-start circuit simultaneously, so overcome the problem that the input circuit of DC power supply can not have slow startup and anti-DC power supply reversal connection function simultaneously.
It should be noted that " connection " in this specification is not limited to direct connection, can also be to stride across other element to connect.For example, soft-start circuit 103 among the figure is connected to back level filter circuit and secondary power supply 104, can be stride across other device for example diode be connected to back level filter circuit and secondary power supply 104, or be connected directly to back level filter circuit and secondary power supply 104.
Among the embodiment of Fig. 3, reverse-connection preventing circuit 102 is primes of soft-start circuit 103, but should be understood that, the present invention is not limited thereto, reverse-connection preventing circuit 102 can also be the back level of soft-start circuit 103, perhaps is arranged at soft-start circuit 103 inside, will be illustrated this in more detail below.
Fig. 4 is embodiment 2 of the present utility model, and the input circuit of the utility model DC power supply comprises: interconnective reverse-connection preventing circuit D and soft-start circuit C, it inserts DC power supply, and is connected to back level filter circuit and secondary power supply E.
Reverse-connection preventing circuit D is the diode VD2 that is just connecing with respect to DC power supply; Soft-start circuit C specifically comprises:
Field effect transistor VT1, capacitor C 1, voltage stabilizing didoe VD1, resistance R 3, resistance R 4, resistance R 5; Wherein,
The grid of field effect transistor VT1 connects after the resistance R 5, is connected in parallel to capacitor C 1 with its source electrode, is connected in parallel to the voltage stabilizing didoe VD1 with respect to the DC power supply reversal connection, and is connected in parallel to resistance R 4;
More than the P2 of the parallel circuits of Gou Chenging point is connected with resistance R 3, is connected to the positive pole of DC power supply and first end of back level filter circuit and secondary power supply, and the source terminal of parallel circuits is connected to the negative pole of DC power supply;
The drain electrode end of field effect transistor VT1 is connected to second end of back level filter circuit and secondary power supply.
Diode VD2 in the present embodiment can realize preventing the function of DC power supply reversal connection.Soft-start circuit C is by capacitor C 1 in parallel between the grid source of field effect transistor VT1, and when powering on, power supply charges to C1 by the RC charge circuit that R3, C1 form, and C1 voltage slowly rises by index law, thereby realizes that field effect transistor VT1's is slowly open-minded.
Because present embodiment has comprised reverse-connection preventing circuit and soft-start circuit simultaneously, so overcome the problem that the input circuit of DC power supply can not have slow startup and anti-DC power supply reversal connection function simultaneously.
As shown in Figure 5, the input circuit of the utility model DC power supply comprises: interconnective reverse-connection preventing circuit D and soft-start circuit C, and it inserts DC power supply, and is connected to back level filter circuit and secondary power supply E, also comprises bleeder circuit A simultaneously and puts back to road B soon; Wherein,
Bleeder circuit comprises the resistance R 1 and the resistance R 2 of series connection, and resistance R 1 is connected to the positive pole of DC power supply, and resistance R 2 is connected to the negative pole of DC power supply;
Put back to the road soon and comprise triode VT2, the base stage of triode VT2 and collector electrode are in parallel with resistance R 2, and its emitter is connected to the P2 point of parallel circuits, and its collector electrode is connected to the P3 point of parallel circuits.
Reverse-connection preventing circuit D is the diode VD2 that is just connecing with respect to DC power supply; Soft-start circuit C specifically comprises:
Field effect transistor VT1, capacitor C 1, voltage stabilizing didoe VD1, resistance R 3, resistance R 4, resistance R 5; Wherein,
The grid of field effect transistor VT1 connects after the resistance R 5, is connected in parallel to capacitor C 1 with its source electrode, is connected in parallel to the voltage stabilizing didoe VD1 with respect to the DC power supply reversal connection, and is connected in parallel to resistance R 4;
More than the P2 of the parallel circuits of Gou Chenging point is connected with resistance R 3, is connected to the positive pole of DC power supply and first end of back level filter circuit and secondary power supply, and the source terminal of parallel circuits is connected to the negative pole of DC power supply;
The drain electrode end of field effect transistor VT1 is connected to second end of back level filter circuit and secondary power supply.
Reverse-connection preventing circuit can be arranged between first end of resistance R 3 and back level filter circuit and secondary power supply, promptly is arranged on the thick line path PATH1 or PATH3 among the figure.
Reverse-connection preventing circuit also can be arranged at soft-start circuit inside, and for example reverse-connection preventing circuit is arranged between the source electrode of the positive pole of the voltage stabilizing didoe VD1 in the parallel circuits and field effect transistor VT1, promptly is arranged on the thick line path PATH2 among the figure.
Anti-reverse diode VD2 is arranged on illustrated thick line path PATH1, PATH2 or the PATH3, can block the anti-filling of back level filter capacitor to C like this.
The circuit of an embodiment of the present utility model partly is placed on PATH1 (being between main switch MOSFET and the back level filter capacitor) to D.Can also be provided with under the application conditions of fast insert-pull B as MOSFET grid source class between capacitor C 1 put back to the road soon.
FU1 is the input main fuse.
Fig. 5 has adjusted the position of anti-reverse diode VD2 among Fig. 4, and it is anti-reverse that VD2 promptly be can be used for, and can be used for preventing anti-filling of back level filter capacitor voltage again, and has increased R1, and potential-divider network that R2 forms and VT1 form puts back to the road soon.
The course of work of the utility model circuit is described below in conjunction with Fig. 5.
When circuit powered on first, the VIN+ power supply charged to C1 by the RC charging circuit that R3 and C1 form, and C1 is for being connected in parallel on the slow startup electric capacity between major loop MOSFET (VT1) grid source class, and the C1 both end voltage is pressed index law and risen, and is reaching the cut-in voltage V of VT1
THBefore, the VT1 equivalence is a variable resistor, utilizes this characteristic to realize that VT1's is slowly open-minded.The value of resistance R 3 and capacitor C 1 can guarantee that VT1 is operated in the SOA district in opening process after preferred, avoid overpower to damage.VD1 is the voltage stabilizing didoe that is connected between the VT1 grid source class, and voltage of voltage regulation is a little more than V
TH, for VT1 grid source driving voltage provides overvoltage protection.
When powering on, putting back to road VT2 soon can conducting, and this is determined by potential-divider network.After being connected on the divider resistance R1 and R2 process dividing potential drop between VIN+ and VIN-power supply, the P1 point links to each other with the base stage b of PNP triode VT2, and the resistance R 3 of soft-start circuit part links to each other through P2 point after the dividing potential drop and the emitter e of VT2 with R4.The resistance of R1～R4 rationally is set, as long as the P1 point voltage is higher than the P2 point voltage, not conducting of VT2 in the time of just can guaranteeing to power on.Power supply VIN+ will realize slow the startup through the charge circuit of R3 and C1 when powering on.
When hot plug, fast break and power up repeatedly can appear in veneer.During instant cut-off, on the capacitor C 1 between MOSFET (VT1) grid source class voltage is arranged still, and power supply VIN+ has cut off the power supply, at this moment, the voltage that P2 is ordered is higher than the P1 point voltage, bear forward voltage and conducting between the e utmost point b utmost point of PNP triode VT2, the voltage on the C1 is released fast by VT2, and slow the startup got ready in order to power on next time.Anti-reverse diode VD2 is connected between the power filtering capacitor C2 and C3 of VT1 and back level, the negative electrode of VD2 extremely links to each other with the D of VT1, anode and filter capacitor C2, the negative electrode of C3 links to each other, like this, when instant cut-off, just blocked back level filter capacitor C2, the voltage on the C3 is by R3, C1, with the loop discharge of VT1 endobiosis diode, accelerated the velocity of discharge of C1.
The utility model in actual applications to the high reliability request of power supply input, has realized that with simple Devices the veneer DC power supply imports the total solution of anti-reverse gentle startup according to veneer.Have the following advantages:
1, from actual one-board power supply demand, existing anti-reverse function has soft start function again;
2, the anti-reverse diode of circuit is moved on between major loop switching tube MOSFET and the back level filter capacitor, both played the anti-reverse function of circuit, blocked anti-filling of back level filter capacitor voltage again;
3, be provided with the major loop MOSFET grid source capacitance voltage road of discharging soon, grid source capacitance voltage can be released fast when making the veneer instant cut-off, MOSFET can be fast by, the impulse current when effectively reducing the veneer hot plug;
4, circuit is simple and reliable, and the cost performance height is realized a kind of power supply input total solution with less device, can make the modular circuit unification and call.
Be preferred embodiment of the present utility model only below, be not limited to the utility model, for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. the input circuit of a DC power supply is characterized in that, comprising: interconnective reverse-connection preventing circuit and soft-start circuit, it inserts DC power supply, and is connected to back level filter circuit and secondary power supply.
2. input circuit according to claim 1 is characterized in that, described reverse-connection preventing circuit is the diode VD2 that is just connecing with respect to described DC power supply; Described soft-start circuit specifically comprises:
Field effect transistor VT1, capacitor C 1, voltage stabilizing didoe VD1, resistance R 3, resistance R 4, resistance R 5; Wherein,
The grid of field effect transistor VT1 connects after the resistance R 5, is connected in parallel to capacitor C 1 with its source electrode, is connected in parallel to the voltage stabilizing didoe VD1 with respect to described DC power supply reversal connection, and is connected in parallel to resistance R 4;
More than the P2 of the parallel circuits of Gou Chenging point is connected with resistance R 3, is connected to the positive pole of described DC power supply and first end of described back level filter circuit and secondary power supply, and the source terminal of described parallel circuits is connected to the negative pole of described DC power supply;
The drain electrode end of field effect transistor VT1 is connected to second end of described back level filter circuit and secondary power supply.
3. input circuit according to claim 2 is characterized in that, described reverse-connection preventing circuit is arranged between the P3 point of the negative pole of described DC power supply and described parallel circuits.
4. input circuit according to claim 2 is characterized in that, described reverse-connection preventing circuit is arranged between second end of the drain electrode end of field effect transistor VT1 and described back level filter circuit and secondary power supply.
5. input circuit according to claim 2 is characterized in that, described reverse-connection preventing circuit is arranged between first end of resistance R 3 and described back level filter circuit and secondary power supply.
6. input circuit according to claim 2 is characterized in that, described reverse-connection preventing circuit is arranged at described soft-start circuit inside.
7. input circuit according to claim 6 is characterized in that, described reverse-connection preventing circuit is arranged between the source electrode of the positive pole of the voltage stabilizing didoe VD1 in the described parallel circuits and field effect transistor VT1.
8. according to each described input circuit of claim 2 to 7, it is characterized in that, also comprise:
Bleeder circuit and put back to the road soon; Wherein,
Described bleeder circuit comprises the resistance R 1 and the resistance R 2 of series connection, and resistance R 1 is connected to the positive pole of described DC power supply, and resistance R 2 is connected to the negative pole of described DC power supply;
The described road of putting back to soon comprises triode VT2, and the base stage of described triode VT2 and collector electrode are in parallel with resistance R 2, and its emitter is connected to the P2 point of described parallel circuits, and its collector electrode is connected to the P3 point of described parallel circuits.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200056543U CN201181903Y (en) | 2008-04-01 | 2008-04-01 | Input circuit of DC power supply |
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| CNU2008200056543U CN201181903Y (en) | 2008-04-01 | 2008-04-01 | Input circuit of DC power supply |
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| CN102136724A (en) * | 2011-01-26 | 2011-07-27 | 华为技术有限公司 | Method and device for protecting reverse connection prevention and slow start of direct-current power supply input |
| CN102570785A (en) * | 2010-12-30 | 2012-07-11 | 中兴通讯股份有限公司 | Direct-current power supply hot plug slow starting control circuit and control method |
| CN102780390A (en) * | 2012-07-23 | 2012-11-14 | 西安电子科技大学 | Slowly-starting circuit for mine direct current conversion intrinsic safe power supply |
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