CN202872625U - Anti-surge power input filter - Google Patents
Anti-surge power input filter Download PDFInfo
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- CN202872625U CN202872625U CN 201220578950 CN201220578950U CN202872625U CN 202872625 U CN202872625 U CN 202872625U CN 201220578950 CN201220578950 CN 201220578950 CN 201220578950 U CN201220578950 U CN 201220578950U CN 202872625 U CN202872625 U CN 202872625U
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- input
- filter
- common mode
- gas discharge
- discharge tube
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Abstract
The utility model discloses an anti-surge power input filter, which comprises a first-stage filter unit or sequentially connected multi-stage filter units. The anti-surge power input filter is characterized in that each filter unit comprises a gas discharge tube and a decoupling resistor. The gas discharge tube and the decoupling resistor are connected in series across the two ends of the common-mode inductor of the filter unit. The input end of the common-mode inductor is connected with the gas discharge tube and the gas discharge tube is connected in series with the decoupling resistor. The decoupling resistor is connected with the output end of the common-mode inductor. On the premise that the normal suppression of other interferences (such as electrical fast transient and damped oscillation) is realized by means of an EMI Filter arranged at the inlet of a power supply, the amplified action of filters on surge common-mode interference signals is eliminated. Therefore, the anti-surge performance and the resistance of the power supply to the common-mode interference are greatly improved.
Description
Technical field
The utility model relates to the secondary device power supply input filter antisurge technology such as electric power system observing and controlling, protection, and technical field belongs to the industrial power field.
Background technology
The equipment such as electric power system observing and controlling, protection are to break down or during irregular operating when the electric component in the electric power system, make quickly and accurately circuit breaker trip or send the automatics of signal.These kind equipment great majority are the plug-in unit subrack structure, by one or more Switching Power Supply plug-in unit DC110V/DC220V are changed the various power supplys of output, such as 5V, 12V, 24V etc.Because device is placed in industrial occasions; its various informativeization of external electromagnetic interference; such as switch interference, lightning surge, the drawing of capacitive inductive load; the interference voltage level is also higher; these interference may cause the power supply of protective device to occur interrupting in short-term or damaging, the therefore requirement higher to the anti-interference proposition of power insert.
Disturb in order to reduce or eliminate the installation's power source port, common input at the installation's power source plug-in unit carries out filtering at present, its circuit theory as shown in Figure 1, consist of mode filter with following element, 4 Y electric capacity (C1, C2, C5, C6), X electric capacity (C3 on 2, C4), 1 common mode inductance (L1), above circuit is to the fast transient in disturbing, the damped oscillation wave interference has obvious inhibitory action, but surge (1.2/50us, can produce resonance to this circuit when the 8/20us composite wave) disturbing (common mode), cause HV+ output over the ground (safely, shell ground) produce high pressure, its voltage magnitude can reach the input surge voltage more than 2 times.The control chip and the switching tube abnormal that cause Switching Power Supply, even puncture power transformer, cause that other plug-in unit damages.
Solving filter output is being subjected to surge impact high-tension two schemes to occur: one can reduce the interference voltage level; Two can to filter output to safely, shell ground increases piezo-resistance and suppresses.But above two schemes all can not satisfy the instructions for use of electric power system observing and controlling, protection equipment, and the first has reduced anti-interference level, and is inadvisable; The second, piezo-resistance are aging easily, after the action several times, leakage current can increase, thereby causes piezo-resistance overheated, finally causes ageing failure, and the power import end also has AC2KV, and the requirement of withstand voltage of DC2.8KV is selected withstand voltage high piezo-resistance Surge suppression effect meeting variation.Therefore, two schemes all can not meet the demands, and needs to adopt the filtering performance that neither affects filter can improve again the circuit of antisurge ability.
The utility model content
In order to address the above problem, the purpose of this utility model is to provide a kind of antisurge power supply input filter, normally suppress under the condition of other interference (such as fast transient, damp oscillatory wave) not affecting the power import electromagnetic interface filter, eliminate filter to the amplification of surge common mode interference signal, thus make the anti-wave of power supply in all the mould interference performance greatly increase.
In order to address the above problem, technical solution adopted in the utility model is:
A kind of antisurge power supply input filter, comprise one-level filter cell or the multiple filter unit that links to each other successively, it is characterized in that: described every grade of filter cell comprises gas discharge tube and decoupling resistor, the common mode inductance two ends that described gas discharge tube is connected with decoupling resistor and is connected across filter cell.
Aforesaid a kind of antisurge power supply input filter is characterized in that: described power supply input filter adopts the power input electromagnetic interface filter.
Aforesaid a kind of antisurge power supply input filter, it is characterized in that: the input of described common mode inductance is connected with gas discharge tube, and gas discharge tube and decoupling resistor are connected in series, and decoupling resistor is connected with the output of common mode inductance.
Aforesaid a kind of antisurge power supply input filter, it is characterized in that: the positive input terminal of described filter cell input power is linked an end of safety capacitor C 2, the other end of safety capacitor C 2 is received safely, the negative input end of input power is linked an end of safety capacitor C 1, and the other end of safety capacitor C 1 is received safely; The positive input terminal of input power and negative input end are connected respectively to first input end and the second input of common mode inductance L1, the first input end of described common mode inductance L1 and the second input safety capacitor C 4 in parallel, the second input of common mode inductance L1 is connected with gas discharge tube G1, gas discharge tube G1 and decoupling resistor R1 are connected in series, decoupling resistor R1 is connected with the second output of common mode inductance L 1, the second input of common mode inductance L1 also is connected with an end of safety capacitor C 6, the other end of safety capacitor C 6 is received safely, the first output of described common mode inductance L1 and the second output safety capacitor C 3 that is connected in parallel, the first output of common mode inductance L1 is connected with an end of safety capacitor C 5, and the other end of safety capacitor C 5 is received safely.
Aforesaid a kind of antisurge power supply input filter is characterized in that: described decoupling resistor R1 adopts the 2W power resistor, and resistance adopts 2～12 ohm.
The beneficial effects of the utility model are: the power input electromagnetic interface filter can produce at the output of filter the input surge voltage more than the twice during by the surge common mode interference signal, the utility model mainly utilizes the flash-over characteristic of gas discharge tube, the voltage at common mode inductance coil two ends is carried out strangulation, reduce or eliminate the filter circuit of power input filter to the amplification of surge interference voltage.
The utlity model has following characteristics:
1, circuit structure of the present utility model is simple and reliable, and cost is low;
2, be applicable to various power supply input electromagnetic interface filter circuit;
3, be applicable to surge and disturb high grade requirements;
4, the requirement of realize relay observing and controlling, protection device power supply (DPS) port antisurge disturbing level Four (4KV) to use.
Description of drawings
Fig. 1 is the circuit theory diagrams of the input filtering device of existing power supply plug-in unit.
Fig. 2 is the utility model one-level filter execution mode circuit theory diagrams.
Fig. 3 is the utility model dual stage filter execution mode circuit theory diagrams.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing.
A kind of antisurge power supply input filter comprises one-level filter cell or the multiple filter unit that links to each other successively, described each filter cell comprises gas discharge tube and decoupling resistor, the input of described common mode inductance is connected with gas discharge tube, gas discharge tube and decoupling resistor are connected in series, and decoupling resistor is connected with the output of common mode inductance.Described power supply input filter adopts the power input electromagnetic interface filter.Decoupling resistor is the 2W power resistor, and resistance adopts 2～12 ohm.
Fig. 2 is one-level filter execution mode circuit theory diagrams, Figure 3 shows that dual stage filter execution mode circuit theory diagrams, it realizes that principle all is the same, now describe concrete execution mode in detail with one-level filter (Fig. 2): just (DC+) of input power links an end of safety capacitor C 2, the other end of safety capacitor C 2 is received safely, negative (DC-) of input power links an end of safety capacitor C 1, the other end of safety capacitor C 1 is received safely, just (DC+) of input power and negative (DC-) is connected respectively to IN1 input and the IN2 input of common mode inductance L1 simultaneously, the IN1 input of common mode inductance L1 safety capacitor C 4 in parallel with the IN2 input, simultaneously, the IN2 input of common mode inductance L1 is connected with gas discharge tube G1, gas discharge tube G1 and decoupling resistor R1 are connected in series, decoupling resistor R1 is connected with the out2 output of common mode inductance L 1, one end of out2 output and safety capacitor C 6, the other end of safety capacitor C 6 is received safely, out1 output safety capacitor C 3 in parallel with the out2 output, one end of out1 output and safety capacitor C 5, the other end of safety capacitor C 5 is received safely.
More than show and described basic principle of the present utility model, principal character and advantage.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. antisurge power supply input filter, comprise one-level filter cell or the multiple filter unit that links to each other successively, it is characterized in that: described each filter cell comprises gas discharge tube and decoupling resistor, the common mode inductance two ends that described gas discharge tube is connected with decoupling resistor and is connected across filter cell.
2. a kind of antisurge power supply input filter according to claim 1 is characterized in that: described power supply input filter employing power input electromagnetic interface filter.
3. a kind of antisurge power supply input filter according to claim 2, it is characterized in that: the input of described common mode inductance is connected with gas discharge tube, and gas discharge tube and decoupling resistor are connected in series, and decoupling resistor is connected with the output of common mode inductance.
4. a kind of antisurge power supply input filter according to claim 3, it is characterized in that: the positive input terminal of described filter cell input power is linked an end of safety capacitor C 2, the other end of safety capacitor C 2 is received safely, the negative input end of input power is linked an end of safety capacitor C 1, and the other end of safety capacitor C 1 is received safely; The positive input terminal of input power and negative input end are connected respectively to first input end and the second input of common mode inductance L1, the first input end of described common mode inductance L1 and the second input safety capacitor C 4 in parallel, the second input of common mode inductance L1 is connected with gas discharge tube G1, gas discharge tube G1 and decoupling resistor R1 are connected in series, decoupling resistor R1 is connected with the second output of common mode inductance L 1, the second input of common mode inductance L1 also is connected with an end of safety capacitor C 6, the other end of safety capacitor C 6 is received safely, the first output of described common mode inductance L1 and the second output safety capacitor C 3 that is connected in parallel, the first output of common mode inductance L1 is connected with an end of safety capacitor C 5, and the other end of safety capacitor C 5 is received safely.
5. a kind of antisurge power supply input filter according to claim 4 is characterized in that: described decoupling resistor R1 employing 2W power resistor, 2～12 ohm of resistance employings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220578950 CN202872625U (en) | 2012-11-05 | 2012-11-05 | Anti-surge power input filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220578950 CN202872625U (en) | 2012-11-05 | 2012-11-05 | Anti-surge power input filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202872625U true CN202872625U (en) | 2013-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220578950 Expired - Lifetime CN202872625U (en) | 2012-11-05 | 2012-11-05 | Anti-surge power input filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202872625U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840446A (en) * | 2014-02-21 | 2014-06-04 | 国家电网公司 | Circuit used for communication device power source disturbance suppression in transformer substation |
| CN104882870A (en) * | 2015-03-03 | 2015-09-02 | 华为技术有限公司 | Lightning protection circuit |
-
2012
- 2012-11-05 CN CN 201220578950 patent/CN202872625U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840446A (en) * | 2014-02-21 | 2014-06-04 | 国家电网公司 | Circuit used for communication device power source disturbance suppression in transformer substation |
| CN103840446B (en) * | 2014-02-21 | 2017-01-25 | 国家电网公司 | Circuit used for communication device power source disturbance suppression in transformer substation |
| CN104882870A (en) * | 2015-03-03 | 2015-09-02 | 华为技术有限公司 | Lightning protection circuit |
| CN104882870B (en) * | 2015-03-03 | 2018-03-09 | 华为技术有限公司 | A kind of lightning protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150922 Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Patentee after: NANJING NARI Group Corp. Patentee after: NARI TECHNOLOGY Co.,Ltd. Address before: High road high tech Zone of Nanjing City, Jiangsu Province, No. 20 210061 Patentee before: NARI TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |