CN201138785Y - Wave filter circuit for switch power supply - Google Patents
Wave filter circuit for switch power supply Download PDFInfo
- Publication number
- CN201138785Y CN201138785Y CNU2007201985307U CN200720198530U CN201138785Y CN 201138785 Y CN201138785 Y CN 201138785Y CN U2007201985307 U CNU2007201985307 U CN U2007201985307U CN 200720198530 U CN200720198530 U CN 200720198530U CN 201138785 Y CN201138785 Y CN 201138785Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- common mode
- switch power
- filter circuit
- capacitor
- Prior art date
- 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 - Fee Related
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Abstract
The utility model provides an alternating current/direct current switch power supply filter circuit which comprises a filter circuit and a voltage dependent resistor which are arranged at the input end of a switch power supply and a filter capacitor at the output end. The filter circuit comprises two groups of difference module and common mode inductors and the peripheral capacitors thereof, which can effectively control various kinds of interference caused by a back stage switch power supply module, wherein, the voltage dependent resistor can prevent the module from inputting too high voltage, and the filter capacitor can reduces the harmonic component of the power supply source, so the electromagnetic compatibility of the switch power supply is improved greatly.
Description
Technical field
The utility model relates to the instrument power supply, particularly a kind of Switching Power Supply filter circuit.
Background technology
In power supply grid, because a large amount of nonlinear load, especially instrument uses power supply in ac/dc (AC/DC) transfer process, frequency 50Hz alternating current produces a large amount of harmonic waves when rectification, this harmonic component not only causes the loss of reactive power, even influences the safety of part on-line instrument equipment; And " pollution " power supply grid, this interference may cause mains supply undesired.
And existing AC/DC switch power module, this module has power factor (PF) control (PFC) circuit, its core technology becomes for the input current of the control Zero Current Switch converter waveform with rectified supply voltage, the interchange input current is become with alternating voltage, greatly reduced the generation of harmonic wave.But produced High-frequency Interference in the control loop of this circuit again, influenced the raising of Electro Magnetic Compatibility equally.
Summary of the invention
The utility model is in order to solve in the AC/DC Switching Power Supply the relevant existing technical problem of harmonic wave conducted interference, and a kind of Switching Power Supply filter circuit is provided.
According to above-mentioned purpose, the utility model provides a kind of Switching Power Supply filter circuit, comprises differential mode inductance L
1, L
3, common mode inductance L
2, L
4, differential mode capacitor C
1, C
2, C
5, common mode capacitance C
3, C
4, bleeder resistance R
1, and piezo-resistance R
2, filter capacitor C
6
Differential mode inductance L wherein
1, L
3One end is connected with power supply E respectively, its other end respectively with the common mode inductance L
2, L
4Series connection, common mode inductance L
2, L
4The other end is connected with the input 1,3 of Switching Power Supply AC/DC respectively;
Differential mode capacitor C wherein
1Two ends are in parallel with power supply E respectively, differential mode capacitor C
2, C
5Two ends respectively with the common mode inductance L
2, L
4Other end parallel connection;
Common mode capacitance C wherein
3, C
4The series connection, its tie point ground connection, its other end respectively with the common mode inductance L
2, L
4Other end parallel connection;
Bleeder resistance R wherein
1Two ends respectively with the common mode inductance L
2, L
4Other end parallel connection.
Foregoing circuit, wherein piezo-resistance R
2Two ends are in parallel with the input 1,3 of Switching Power Supply AC/DC respectively.
Foregoing circuit, wherein filter capacitor C
6Two ends are in parallel with the output 2,5 of Switching Power Supply AC/DC respectively.
The utility model is owing to taked above technical measures, promptly the input at AC/DC switch power supply AC/DC has increased a filter circuit, the harmonic components that had both suppressed generation in the AC/DC conversion effectively, suppress the interference that power factor (PF) control circuit (PFC) produces in the Switching Power Supply again effectively, thereby greatly improved the electromagnetic compatibility index.
Description of drawings
Accompanying drawing is a circuit diagram of the present utility model
Embodiment
As shown in the figure, the utility model is made up of circuit such as input filtering circuit, AC/DC switch power module, filter capacitors.In filter circuit, include 2 groups of differential mode (L
1, L
3), common mode (L
2, L
4) inductance, owing to require the interfering frequency of inhibition very low, enough inductance values should be arranged, prevent magnetic saturation again, therefore select the higher core material of diamagnetic saturation intensity for use, and adopted special winding method.They are with peripheral capacitor C
1, C
2, C
3, C
4Combination effectively suppresses by the back level various interference that module produced, and its common mode, is about 20dB when differential mode is suppressed at 10kHz, is about 40dB during 100kHz.Piezo-resistance R wherein
2Too high for preventing input voltage; Differential mode capacitor C
5In order to strengthen stoping the interference earial drainage that the PFC control circuit is caused, this electric capacity also suppresses (although it might cause power factor to decrease) to some extent to this interference signal.Correctly choose filter capacitor C
6It also is the key that reduces power supply 50Hz harmonic wave, as AC/DC during in rectification, the temporary impact electric current of diode on filter capacitor is very big, it is the basic reason that produces harmonic wave, demanded power output according to this power subsystem, and the demand of retention time, we have selected suitable capacitance by calculating and experiment.The radiation of electromagnetism and conduction can transform influence mutually, so we have taken into full account shielding and grounding measures when circuit design.Through after the above various comprehensive Design, improved Electro Magnetic Compatibility greatly.
Claims (3)
1. a Switching Power Supply filter circuit is characterized in that: comprise differential mode inductance (L
1), (L
3), common mode inductance (L
2), (L
4), differential mode capacitor (C
1), (C
2), (C
5), common mode capacitance (C
3), (C
4), bleeder resistance (R
1), and piezo-resistance (R
2), filter capacitor (C
6)
Differential mode inductance (L wherein
1), (L
3) end respectively with power supply (E
Connect, its other end respectively with common mode inductance (L
2), (L
4) series connection, common mode inductance (L
2), (L
4) other end is connected with input (1), (3) of Switching Power Supply (AC/DC) respectively;
Differential mode capacitor (C wherein
1) two ends are in parallel with power supply (E) respectively, differential mode capacitor (C
2), (C
5) two ends respectively with common mode inductance (L
2), (L
4) other end parallel connection;
Common mode capacitance (C wherein
3), (C
4) series connection, its tie point ground connection, its other end respectively with common mode inductance (L
2), (L
4) other end parallel connection;
Bleeder resistance (R wherein
1) two ends respectively with common mode inductance (L
2), (L
4) other end parallel connection.
2. circuit according to claim 1 is characterized in that: piezo-resistance (R wherein
2) two ends are in parallel with input (1), (3) of Switching Power Supply (AC/DC) respectively.
3. circuit according to claim 1 is characterized in that: filter capacitor (C wherein
6) two ends are in parallel with output (2), (5) of Switching Power Supply (AC/DC) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201985307U CN201138785Y (en) | 2007-11-29 | 2007-11-29 | Wave filter circuit for switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201985307U CN201138785Y (en) | 2007-11-29 | 2007-11-29 | Wave filter circuit for switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201138785Y true CN201138785Y (en) | 2008-10-22 |
Family
ID=40039465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201985307U Expired - Fee Related CN201138785Y (en) | 2007-11-29 | 2007-11-29 | Wave filter circuit for switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201138785Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860184A (en) * | 2010-04-16 | 2010-10-13 | 常州佳讯光电产业发展有限公司 | Filter of photovoltaic inverter |
| WO2010124637A1 (en) * | 2009-04-28 | 2010-11-04 | 珠海格力电器股份有限公司 | Single-phase bridgeless power factor correction circuit |
| CN102386760A (en) * | 2011-11-22 | 2012-03-21 | 中冶南方（武汉）自动化有限公司 | Frequency converter multistage EMI (electromagnetic interference) filter circuit |
| CN104218557A (en) * | 2013-05-29 | 2014-12-17 | 深圳远征技术有限公司 | Lightning protection circuit |
| CN106226714A (en) * | 2016-08-31 | 2016-12-14 | 沈阳东软医疗系统有限公司 | A kind of gradient amplifier, control method and imaging device |
| WO2017206503A1 (en) * | 2016-05-31 | 2017-12-07 | 广州视源电子科技股份有限公司 | Circuit for separating mixedly-inputted rf signals and power supply signals and method therefor |
| US9960699B2 (en) | 2016-09-29 | 2018-05-01 | Delta Electronics, Inc. | Power supply system with plural parallel modules and loop current limiting |
| CN108039815A (en) * | 2017-12-15 | 2018-05-15 | 西安许继电力电子技术有限公司 | A kind of electromagnetic interference suppression circuit and its operating method |
| CN110212752A (en) * | 2019-05-30 | 2019-09-06 | 上海航键航空设备有限公司 | A kind of noise reduction filtering circuit |
| CN114172354A (en) * | 2021-12-14 | 2022-03-11 | 航天长峰朝阳电源有限公司 | I-type harmonic suppression power supply |
-
2007
- 2007-11-29 CN CNU2007201985307U patent/CN201138785Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124637A1 (en) * | 2009-04-28 | 2010-11-04 | 珠海格力电器股份有限公司 | Single-phase bridgeless power factor correction circuit |
| CN101860184A (en) * | 2010-04-16 | 2010-10-13 | 常州佳讯光电产业发展有限公司 | Filter of photovoltaic inverter |
| CN102386760A (en) * | 2011-11-22 | 2012-03-21 | 中冶南方（武汉）自动化有限公司 | Frequency converter multistage EMI (electromagnetic interference) filter circuit |
| CN104218557B (en) * | 2013-05-29 | 2017-09-19 | 深圳远征技术有限公司 | A kind of lightning protection circuit |
| CN104218557A (en) * | 2013-05-29 | 2014-12-17 | 深圳远征技术有限公司 | Lightning protection circuit |
| WO2017206503A1 (en) * | 2016-05-31 | 2017-12-07 | 广州视源电子科技股份有限公司 | Circuit for separating mixedly-inputted rf signals and power supply signals and method therefor |
| CN106226714A (en) * | 2016-08-31 | 2016-12-14 | 沈阳东软医疗系统有限公司 | A kind of gradient amplifier, control method and imaging device |
| US10877117B2 (en) | 2016-08-31 | 2020-12-29 | Shanghai Neusoft Medical Technology Co., Ltd. | Gradient amplifier |
| US9960699B2 (en) | 2016-09-29 | 2018-05-01 | Delta Electronics, Inc. | Power supply system with plural parallel modules and loop current limiting |
| CN108039815A (en) * | 2017-12-15 | 2018-05-15 | 西安许继电力电子技术有限公司 | A kind of electromagnetic interference suppression circuit and its operating method |
| CN108039815B (en) * | 2017-12-15 | 2020-02-07 | 西安许继电力电子技术有限公司 | Electromagnetic interference suppression circuit and operation method thereof |
| CN110212752A (en) * | 2019-05-30 | 2019-09-06 | 上海航键航空设备有限公司 | A kind of noise reduction filtering circuit |
| CN114172354A (en) * | 2021-12-14 | 2022-03-11 | 航天长峰朝阳电源有限公司 | I-type harmonic suppression power supply |
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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: 20081022 Termination date: 20151129 |