CN202384759U - Circuit for suppressing surge current - Google Patents
Circuit for suppressing surge current Download PDFInfo
- Publication number
- CN202384759U CN202384759U CN2011205580043U CN201120558004U CN202384759U CN 202384759 U CN202384759 U CN 202384759U CN 2011205580043 U CN2011205580043 U CN 2011205580043U CN 201120558004 U CN201120558004 U CN 201120558004U CN 202384759 U CN202384759 U CN 202384759U
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- current
- power supply
- limiting apparatus
- switching power
- surge current
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Abstract
The utility model relates to the technical field of switching power supplies, in particular to a circuit for suppressing the surge current of a switching power supply. The circuit comprises an alternating current power supply, a bridge rectifier, a filtering capacitor and a switching controller, wherein the pin end of the bridge rectifier is connected in series with a current limiting device. The current limiting device is a power type negative temperature coefficient thermistor which increases the resistance of the switching power supply, so that the surge current is reduced, the surge current at the moment of startup is reduced to be within a security range bearable for a system, and the reliability of the switching power supply is enhanced. When the switching power supply normally works, the thermistor is heated, and the resistance of the thermistor is decreased, so that the overhigh power of the switching power supply is avoided.
Description
Technical field
The utility model relates to the switch power technology field, relates in particular to a kind of circuit that is used for the inhibition surge current of Switching Power Supply.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch pipe turns on and off is kept a kind of power supply of regulated output voltage.Owing to compare traditional linear stabilized power supply; Switching Power Supply has advantages such as efficient height, volume be little; Switching Power Supply has been widely used in the power-supply system of electronic installation, because increasing electronic installation adopts the low-voltage dc power supply power supply, its Switching Power Supply that adopts also is direct-current switch power supply.
As shown in Figure 1, existing Switching Power Supply comprises rectifier bridge and filter capacitor, and in power connection moment, filter capacitor charges, thereby produces a very big charging current, i.e. surge current, and this electric current is far longer than the stable state input current.The amplitude of the size of surge current input voltage when connecting and rectifier bridge determine with the all-in resistance in the loop that electrochemical capacitor forms; The effective value of supposing input ac voltage is 220V; The resistance of the whole internal resistance of source (comprising rectifier bridge and filter capacitor) is Rs=2 Ω; Start when power supply input waveform reaches 90 degree phase places, surge current reaches peak value, and this peak value is I=220*1.414/2=155.5 (A).Though this surge current duration is shorter, if do not suppress, can the life-span of rectifier bridge and filter capacitor be impacted, also influence other equipment in electric main and the same electrical network.Therefore in switch power supply system, need to suppress surge current.
Summary of the invention
The purpose of the utility model is exactly to the deficiency of prior art existence a kind of circuit that suppresses surge current to be provided; Can the limit switch power supply surge current during start; Make the start safe range that to bear of the surge current size system of being reduced to of moment, strengthen the reliability of Switching Power Supply.
To achieve these goals; The technical scheme that the utility model adopts is: a kind of circuit that suppresses surge current; Comprise AC power, rectifier bridge, filter capacitor, on-off controller; The leads ends of said rectifier bridge is in series with current-limiting apparatus, and this current-limiting apparatus is the power-type negative tempperature coefficient thermistor.
Said current-limiting apparatus can be one, and this current-limiting apparatus is connected with an ac input end of rectifier bridge.
Said current-limiting apparatus also can be two, and two said current-limiting apparatus are connected with an ac input end of rectifier bridge respectively.
Said current-limiting apparatus also can be one, and said current-limiting apparatus is connected with a dc output end end of rectifier bridge.
Said current-limiting apparatus also can be two, and two said current-limiting apparatus are connected with a dc output end of rectifier bridge respectively.
The utility model beneficial effect is: the utility model comprises AC power, rectifier bridge, filter capacitor, on-off controller; The leads ends of said rectifier bridge is in series with current-limiting apparatus, and this current-limiting apparatus is the power-type negative tempperature coefficient thermistor, and this thermistor increases the resistance of Switching Power Supply; Thereby reduce surge current; Make the start safe range that can bear of the surge current size system of being reduced to of moment, strengthen the reliability of Switching Power Supply, and during the Switching Power Supply operate as normal; This thermistor heated resistance diminishes, and avoids the power of Switching Power Supply excessive.
Description of drawings
Fig. 1 is the circuit diagram of existing Switching Power Supply.
Fig. 2 is the circuit diagram of a kind of execution mode of circuit of the inhibition surge current of the utility model.
Fig. 3 is the circuit diagram of the another kind of execution mode of circuit of the inhibition surge current of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
embodiment one.
A kind of circuit that suppresses surge current of the utility model; Can be used for direct-current switch power supply, as shown in Figure 2, it comprises AC power 1, rectifier bridge 2, filter capacitor, on-off controller 3; AC power 1 is connected with the ac input end of rectifier bridge 2; The dc output end of rectifier bridge 2 is connected with on-off controller 3, and filter capacitor is connected in parallel on the two ends of on-off controller 3, and on-off controller 3 provides DC power supply to load.The leads ends of said rectifier bridge 2 is in series with current-limiting apparatus 4, and this current-limiting apparatus 4 is the power-type negative tempperature coefficient thermistor, and resistance is 10 Ω under its normal temperature; The effective value of supposing input ac voltage is 220V; The resistance of other parts of whole Switching Power Supply is Rs=2 Ω, and then total resistance is 12 Ω, start when power supply input waveform reaches 90 degree phase places; Surge current reaches peak value; This peak value is I=220*1.414/12=20.9 (A), and not during this current-limiting apparatus 4, the peak value of surge current is I=220*1.414/2=155.5 (A).It is thus clear that this thermistor 4 has increased the resistance of Switching Power Supply, thereby reduce surge current, made the start safe range that to bear of the surge current size system of being reduced to of moment, strengthened the reliability of Switching Power Supply.When the Switching Power Supply operate as normal, this thermistor temp raises rapidly, and its resistance value can drop to a very little rank at Millisecond in other time, avoided the power of Switching Power Supply excessive.
Concrete, as shown in Figure 2, said current-limiting apparatus 4 is one, this current-limiting apparatus 4 is connected with an ac input end of rectifier bridge 2.
embodiment two.
As shown in Figure 3, present embodiment is identical with embodiment one, and difference is: said current-limiting apparatus 4 is two, and two said current-limiting apparatus 4 are connected with an ac input end of rectifier bridge 2 respectively.The other technologies characteristic is identical with embodiment one, repeats no more at this.
embodiment three.
Present embodiment is identical with embodiment one, and difference is: said current-limiting apparatus 4 is one, and said current-limiting apparatus 4 is connected with a dc output end end of rectifier bridge 2.The other technologies characteristic is identical with embodiment one, repeats no more at this.
embodiment four.
Present embodiment is identical with embodiment one, and difference is: said current-limiting apparatus 4 is two, and two said current-limiting apparatus 4 are connected with a dc output end of rectifier bridge 2 respectively.The other technologies characteristic is identical with embodiment one, repeats no more at this.
Should be noted that at last; Above embodiment is only in order to explain the technical scheme of the utility model; But not to the restriction of the utility model protection range, although with reference to preferred embodiment the utility model has been done explanation at length, those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement the technical scheme of the utility model, and not break away from the essence and the scope of the utility model technical scheme.
Claims (5)
1. circuit that suppresses surge current; It comprises AC power (1), rectifier bridge (2), filter capacitor, on-off controller (3); It is characterized in that: the leads ends of said rectifier bridge (2) is in series with current-limiting apparatus (4), and this current-limiting apparatus (4) is the power-type negative tempperature coefficient thermistor.
2. the circuit of inhibition surge current according to claim 1 is characterized in that: said current-limiting apparatus (4) is one, and this current-limiting apparatus (4) is connected with an ac input end of rectifier bridge (2).
3. the circuit of inhibition surge current according to claim 1 is characterized in that: said current-limiting apparatus (4) is two, and two said current-limiting apparatus (4) are connected with an ac input end of rectifier bridge (2) respectively.
4. the circuit of inhibition surge current according to claim 1 is characterized in that: said current-limiting apparatus (4) is one, and said current-limiting apparatus (4) is connected with a dc output end end of rectifier bridge (2).
5. the circuit of inhibition surge current according to claim 1 is characterized in that: said current-limiting apparatus (4) is two, and two said current-limiting apparatus (4) are connected with a dc output end of rectifier bridge (2) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205580043U CN202384759U (en) | 2011-12-28 | 2011-12-28 | Circuit for suppressing surge current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205580043U CN202384759U (en) | 2011-12-28 | 2011-12-28 | Circuit for suppressing surge current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202384759U true CN202384759U (en) | 2012-08-15 |
Family
ID=46633233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205580043U Expired - Fee Related CN202384759U (en) | 2011-12-28 | 2011-12-28 | Circuit for suppressing surge current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202384759U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199688A (en) * | 2013-04-09 | 2013-07-10 | 许继集团有限公司 | Switching power supply and power-on impact current suppression method thereof |
| CN103683255A (en) * | 2013-11-28 | 2014-03-26 | 成都市宏山科技有限公司 | Starting-up anti-surge circuit |
| CN108199568A (en) * | 2018-01-05 | 2018-06-22 | 西安电子工程研究所 | A kind of inhibition in-rush current limiting circuit |
| CN111509963A (en) * | 2020-05-27 | 2020-08-07 | 重庆大全泰来电气有限公司 | Surge current suppression device and converter |
-
2011
- 2011-12-28 CN CN2011205580043U patent/CN202384759U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199688A (en) * | 2013-04-09 | 2013-07-10 | 许继集团有限公司 | Switching power supply and power-on impact current suppression method thereof |
| CN103683255A (en) * | 2013-11-28 | 2014-03-26 | 成都市宏山科技有限公司 | Starting-up anti-surge circuit |
| CN108199568A (en) * | 2018-01-05 | 2018-06-22 | 西安电子工程研究所 | A kind of inhibition in-rush current limiting circuit |
| CN111509963A (en) * | 2020-05-27 | 2020-08-07 | 重庆大全泰来电气有限公司 | Surge current suppression device and converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20171228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |