CN204046409U - AC input current surge suppressor - Google Patents
AC input current surge suppressor Download PDFInfo
- Publication number
- CN204046409U CN204046409U CN201420196508.9U CN201420196508U CN204046409U CN 204046409 U CN204046409 U CN 204046409U CN 201420196508 U CN201420196508 U CN 201420196508U CN 204046409 U CN204046409 U CN 204046409U
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- China
- Prior art keywords
- filter capacitor
- surge
- filter
- power supply
- current
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 238000009434 installation Methods 0.000 claims abstract description 3
- 239000003112 inhibitor Substances 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 22
- 229910052710 silicon Inorganic materials 0.000 description 22
- 239000010703 silicon Substances 0.000 description 22
- 239000004568 cement Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model provides a kind of AC input current surge suppressor, comprise alternating current filter, rectification unit, limit surge module, filter capacitor and DC/DC converter unit, described alternating current filter is connected with described rectification unit, filter capacitor and DC/DC converter unit successively, described limit surge module installation is between described rectification unit with described filter capacitor and be connected with described alternating current filter, be characterized in realizing self-driving type work, accessory power supply is not needed to drive, when after Switching Power Supply output short-circuit, current surge inhibitor can not be burnt.
Description
Technical field
The utility model relates to a kind of current surge inhibitor being input to Switching Power Supply.
Background technology
Get more and more in the Switching Power Supply of world wide research and development at present, along with the development of modern industry, the application of Switching Power Supply is more and more extensive, along with the required precision of control appliance, also more and more higher to the requirement of Switching Power Supply.The feature of Switching Power Supply is just omitted Industrial Frequency Transformer, and what volume was become is more and more less.But bring a shortcoming, civil power causes the impact to electrical network without the direct rectifying and wave-filtering of Industrial Frequency Transformer.Switching Power Supply prime filter capacitor is all generally that 400V is withstand voltage, and the high pressure after rectification is directly to capacitor charging moment, and electric capacity is equivalent to short circuit, and the energy of transient absorption is very large.If do not add Surge suppression measure, the consequence caused is powered on moment prime fuse or air switch tripping operation, and more serious meeting burns out prime power supply unit.
Surge suppression measure is all added with inside existing Switching Power Supply, but all defectiveness, and the measure of existing limit surge has following two kinds substantially.
A kind of is that NTC is changed into common cement resistor.NTC is changed into cement resistor, because cement resistor does not have the negative temperature characteristic of NTC, the appearance of secondary surge current can be slowed down a little, but can not fundamentally eliminate, and the volume ratio NTC of cement resistor wants large many, not only adds the volume of Switching Power Supply, and installs inconvenience.
Another kind is the thermistor adding negative temperature coefficient between filter capacitor and rectifier bridge or before rectifier bridge.Powered on moment, thermistor resistance is very large, probably at 10 ohms, the electric current limiting capacitor charging, at tens Amps, inhibits surge current to the impact of prime equipment, after NTC has worked a period of time, due to the accumulation of heat, resistance becomes very little, reduces overall power.Directly use thermistor NTC, due to the restriction of NTC self, through-current capacity is not very large, this limit surge mode can only be used on small-power switching power-supply, in the application of particularly military products power supply, defect is more outstanding, if only have NTC, during low temperature resistance can become very large, power supply easily occurs that input is low and works when drawing inclined abnormal in this case, more reduces the efficiency of power supply.On this basis, at resistance two ends and a controllable silicon, silicon controlled trigger end controls by rear class Switching Power Supply, after Switching Power Supply startup, and controlled silicon conducting work.Resistance only works instantaneously in startup.Shorter than the input filter capacitor charging time used owing to exporting settling time, cause when also underfill is electric for input filter capacitor, controllable silicon and conducting, the direct conducting of controllable silicon causes too early ineffective of NTC, can cause the appearance of secondary surge current like this.
Summary of the invention
The technical problem that the utility model solves is the suppression providing a kind of Switching Power Supply limit inrush currents for the deficiencies in the prior art, to realize self-driving type work, does not need accessory power supply to drive.
To achieve these goals, the technical solution of the utility model is such: the utility model AC input current surge suppressor, comprise alternating current filter, rectification unit, limit surge module, filter capacitor and DC/DC converter unit, described alternating current filter is connected with described rectification unit, filter capacitor and DC/DC converter unit successively, and described limit surge module installation is between described rectification unit with described filter capacitor and be connected with described alternating current filter.
This technical side has the following advantages:
1, the utility model not only improves the defect of original circuit from circuit, structurally an also more progressive step, change present attachment into, and integration degree is high from original plug-in mounting, more convenient to use flexibly quick;
2., self-driving type work can be realized, not need accessory power supply to drive;
3., when after Switching Power Supply output short-circuit, current surge inhibitor can not be burnt.
Accompanying drawing explanation
Fig. 1: utility model works schematic diagram.
Fig. 2: the utility model limit surge module concrete structure figure.
Fig. 3: the utility model shelling machine figure.
Embodiment
Illustrate below in conjunction with accompanying drawing and the utility model is described further.
As shown in Figure 1, the utility model AC input current surge suppressor, comprise alternating current filter (1), rectification unit (2), limit surge module (3), filter capacitor (4) and DC/DC converter unit (5), described alternating current filter (1) is connected with described rectification unit (2), filter capacitor (4) and DC/DC converter unit (5) successively, and described limit surge module (3) to be arranged between described rectification unit (2) with described filter capacitor (4) and to be connected with described alternating current filter (1).
Input ac voltage becomes high-pressure pulsating direct current by after rectification unit (2), become smooth direct current through filter capacitor (4) filtering again to power to rear end DC/DC converter unit (5), according to capacitance characteristic, electric capacity initial charge is short-circuit condition, if the direct current after rectification is directly gone filtering with electric capacity, the short-circuit condition that electric capacity starts can produce very large impulse current at input circuit, in order to avoid this phenomenon, between filter capacitor (4) and rectification unit (2), add limit surge module (3).
The power initiation initial stage, output voltage is not set up, controllable silicon does not work owing to not having control signal, and to capacitor charging by being connected in series thermistor with between rectification unit (2), input moment maximum current is now determined by the thermistor resistance be connected in series and input rectifying ceiling voltage.According to Ohm's law I=U/R, when input voltage is nominal 220V, rectification direct voltage is out that 308V, R value gets 10 ohm usually, and now electric current is 30.8A.
From startup, rear delay 500ms, makes optocoupler U1 conducting, thus makes controlled silicon conducting, charged electrical road blocking fallen.
Be limited between rectification unit (2) and filter capacitor (4) in Fig. 1 surge module (3), booting moment, the power initiation initial stage, output voltage is not set up, controllable silicon (Q5 in Fig. 2) is not owing to having control signal not work, by connecing power resistor (6) to filter capacitor (4) charging, input moment maximum current is now determined by the resistance be connected in series and input rectifying ceiling voltage.
The high voltage direct current that electric main obtains after rectifying and wave-filtering is first charged to filter capacitor (4) by resistance, the charging current of filter capacitor is limited by resistance, the output voltage of this time limit surge module starts to set up, owing to being added in the control of optocoupler (in Fig. 2 U1) by triode (in Fig. 2 Q4 and Q7) of controllable silicon (in Fig. 2 Q5) controlled stage, before U1 does not work, controllable silicon not conducting, and the conducting of Q7 controls by the conducting of Q4.
When the BE voltage of Q4 is more than 0.7, triode Q4 conducting, according to this characteristic, the conducting of optocoupler U1 is controlled by the conducting of triode Q7, thus control silicon controlled ON time, allow controlled silicon conducting after filter capacitor can be allowed like this to be full of electricity fully again, avoid the appearance of secondary surge current.
In Fig. 2, controlled stage delay circuit, the delay capacitor of all electric capacity for this reason in circuit, its size can adjust silicon controlled ON time, and R15 is charging resistor, and D6 is discharge diode.
When after input energising, after C8 is full of electricity by R15 charging resistor, Q4 conducting and then Q7 and Q5 conducting, controllable silicon work, resistance quits work.
When after input power-off, C8 is discharged by D6 discharge diode, and when ensureing that next time powers on, time of delay is consistent.
By changing silicon controlled through-current capacity, changing the through-current capacity of this utility model, adapting to the Switching Power Supply of different capacity grade.
Controllable silicon heat-conducting glue adheres on aluminum-based copper-clad plate, and all the other devices mount on the plank of upper strata.Centre is connected by contact pin.Finally with silica gel, inside is shut, adds shell, can with a lot of DC/DC module with the use of.
Controllable silicon is power device, requires heat radiation, must water and firmly adhere on base plate, need reconcilable device to be mounted on the superiors of plank with heat conductive insulating, is convenient to regulate.
Common limit surge circuit silicon controlled service time is only by controlling the settling time of output voltage, when the capacity of filter capacitor is very large, needing can be very long to the time of filter capacitor charging, after output voltage is set up completely, controllable silicon is conducting, electric capacity is underfill electricity also, when controlled silicon conducting moment, can produce the appearance of a very large surge current.Utility model adds time delay measure than common limit surge measure, and the time making controllable silicon service time and filter capacitor be full of electricity keeps synchronous, effectively inhibits controllable silicon to open the appearance of moment secondary surge current.
Common limit surge circuit was all be inserted on pcb board with discrete component in the past, and such mounting structure is not suitable for the requirement of Switching Power Supply miniaturization, and everyone the arrange style of pcb board is different, caused its performance also being affected more or less.Utility model adopts the mode be integrated in a module, and most of components and parts adopt the form of attachment, reduce volume, make performance more stable, cooperate the more convenient resource utilization that makes more to optimize with Switching Power Supply.
What needs were illustrated is for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the content that all should belong to appended by technical solutions of the utility model.
Claims (1)
1. an AC input current surge suppressor, it is characterized in that: comprise alternating current filter, rectification unit, limit surge module, filter capacitor and DC/DC converter unit, described alternating current filter is connected with described rectification unit, filter capacitor and DC/DC converter unit successively, and described limit surge module installation is between described rectification unit with described filter capacitor and be connected with described alternating current filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420196508.9U CN204046409U (en) | 2014-04-22 | 2014-04-22 | AC input current surge suppressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420196508.9U CN204046409U (en) | 2014-04-22 | 2014-04-22 | AC input current surge suppressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204046409U true CN204046409U (en) | 2014-12-24 |
Family
ID=52247035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420196508.9U Expired - Lifetime CN204046409U (en) | 2014-04-22 | 2014-04-22 | AC input current surge suppressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204046409U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110100363A (en) * | 2017-03-17 | 2019-08-06 | 株式会社京滨 | Circuit protection device and voltage check device |
-
2014
- 2014-04-22 CN CN201420196508.9U patent/CN204046409U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110100363A (en) * | 2017-03-17 | 2019-08-06 | 株式会社京滨 | Circuit protection device and voltage check device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141224 |