CN101997310A - Surge protection circuit and flyback power factor correction device - Google Patents
Surge protection circuit and flyback power factor correction device Download PDFInfo
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- CN101997310A CN101997310A CN2009101897085A CN200910189708A CN101997310A CN 101997310 A CN101997310 A CN 101997310A CN 2009101897085 A CN2009101897085 A CN 2009101897085A CN 200910189708 A CN200910189708 A CN 200910189708A CN 101997310 A CN101997310 A CN 101997310A
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- protection circuit
- power factor
- resistance
- surge protection
- flyback power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a surge protection circuit and a flyback power factor correction device which are applicable to the technical field of electronics. The surge protection circuit comprises an absorption module and a discharge module, wherein the absorption module is used for absorbing surge voltage, and the discharge module is connected with the absorption module and is used for releasing electric energy absorbed by the absorption module. In the invention, the surge protection circuit is used for absorbing surge voltage produced at an AC input end of the flyback power factor correction device when suffering from lightning strokes or other interferences and carries out energy release so as to prevent the flyback power factor correction device from being damaged. The surge protection circuit has the advantages of good effect, simple structure and low cost and meets the users' requirement for high cost performance for products.
Description
Technical field
The invention belongs to electronic technology field, relate in particular to a kind of surge protection circuit and flyback power factor correcting device.
Background technology
In recent years, LED obtains more and more widely application as a kind of green illumination light source.According to the requirement of standard GB 17625.1-2003 to electronic product harmonic current Emission Limits, compare other products, standard has been made strict more regulation to the light fixture series products that comprises LED.In addition, LED does not have strict restriction because generally all use constant-current control circuit to drive for the prime output voltage ripple.
According to the These characteristics of LED, can pass through a kind of flyback power factor correcting device, directly export constant safe voltage to the constant-current control circuit driving LED, the sort circuit device has high cost performance because of it, has in the industry cycle obtained using widely.Yet, because the voltage after primary side can not equally use the high-voltage large-capacity electrochemical capacitor to rectification with other switching power unit carries out filtering, otherwise will cause intermodulation distortion and influence the power factor correction effect greatly even can't reach the Compulsory Feature of relevant harmonic current limit value, therefore poor in the antisurge performance of the ac input end of this means for correcting.
In order to reach related request, existing way is to add Surge Protector on flyback power factor correcting device, i.e. lightning arrester, but effect is unsatisfactory, inaccessible GB/T 17626.5-2008 standard relevant requirements.This in addition way has not only increased product cost, has also increased small product size, is difficult to satisfy the requirement of user to the product high performance-price ratio.
Summary of the invention
The object of the present invention is to provide a kind of surge protection circuit, be intended to solve existing flyback power factor correcting device and have the poor problem of antisurge performance.
The present invention is achieved in that a kind of surge protection circuit, and described surge protection circuit comprises:
The absorption module that surge voltage is absorbed; And
Be connected the discharge module that the electric energy that described absorption module is absorbed discharges with described absorption module.
In the said structure, described absorption module comprises first diode and first electric capacity, and the anode of described first diode is the input of described surge protection circuit, and the negative electrode of described first diode connects the positive pole of first electric capacity, the minus earth of described first electric capacity.
In the said structure, described discharge module comprises first resistance and second resistance, the positive pole of described first electric capacity of first termination of described first resistance, first end of described second resistance of second termination of described first resistance, the second end ground connection of described second resistance.
Another object of the present invention is to provide a kind of flyback power factor correcting device; described flyback power factor correcting device comprises flyback power factor correcting device body; described flyback power factor correcting device body comprises rectifier bridge; described flyback power factor correcting device also comprises surge protection circuit; the cathode output end of the described rectifier bridge of input termination of described surge protection circuit, described surge protection circuit comprises:
Be connected the absorption module that surge voltage is absorbed with the cathode output end of described rectifier bridge; And
Be connected the discharge module that the electric energy that described absorption module is absorbed discharges with described absorption module.
In the said structure, described absorption module comprises first diode and first electric capacity, and the anode of described first diode connects the cathode output end of described rectifier bridge, and the negative electrode of described first diode connects the positive pole of first electric capacity, the minus earth of described first electric capacity.
In the said structure, described discharge module comprises first resistance and second resistance, the positive pole of described first electric capacity of first termination of described first resistance, first end of described second resistance of second termination of described first resistance, the second end ground connection of described second resistance.
In the present invention; surge protection circuit absorbs in the surge voltage of being struck by lightning or other produces when disturbing the ac input end of flyback power factor correcting device; and carrying out energy discharges; thereby avoided flyback power factor correcting device to be damaged; this surge protection circuit is effective; and simple in structure, with low cost, satisfied the requirement of user to the product high performance-price ratio.
Description of drawings
Fig. 1 is the structure chart of the flyback power factor correcting device that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit figure of the flyback power factor correcting device that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structure of the flyback power factor correcting device that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
Flyback power factor correcting device comprises flyback power factor correcting device body 100; the circuit structure of flyback power factor correcting device body 100 is a prior art; here repeat no more; its particular circuit configurations as shown in Figure 1; flyback power factor correcting device body 100 comprises rectifier bridge BD1; flyback power factor correcting device also comprises surge protection circuit 200; the cathode output end of the input termination rectifier bridge BD1 of surge protection circuit 200; one end ground connection of surge protection circuit 200; wherein; surge protection circuit 200 comprises with the cathode output end of rectifier bridge BD1 and being connected; the absorption module 201 that surge voltage is absorbed; and the discharge module 202 that is connected with absorption module 201, the electric energy that absorbs module 201 absorptions is discharged.
Fig. 2 shows the exemplary circuit structure of the flyback power factor correcting device that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
As one embodiment of the invention, absorb module 201 and comprise the first diode D1 and first capacitor C 1, the anode of the first diode D1 connects the cathode output end of rectifier bridge BD1, and the negative electrode of the first diode D1 connects the positive pole of first capacitor C 1, the minus earth of first capacitor C 1.
The operation principle of this surge protection circuit is:
1; principle during operate as normal: in order to prevent to influence the operate as normal of flyback power factor correcting device; second capacitor C 2 must be used the electric capacity of low capacity; only play the High frequency filter effect; the appearance value of first capacitor C 1 is much larger than second capacitor C 2; thereby starting shooting moment; alternating current charges to first capacitor C 1 through the first diode D1 earlier after by rectifier bridge BD1 rectification; when the charging voltage on first capacitor C 1 is climbed the input ac voltage peak value rapidly; the first diode D1 ends, and surge protection circuit 200 can not influence flyback power factor correcting device operate as normal.In addition, first resistance R 1 and second resistance R 2 be bleeder resistance just, because that resistance can obtain is bigger, causes thus and can ignore to the influence of power factor correction effect.
2, the realization of surge protection function: when the ac input end of flyback power factor correcting device is struck by lightning or other disturbs when producing surge voltage; surge voltage will be absorbed by first capacitor C 1 by the first diode D1 is instantaneous; because this type of surge voltage duration is extremely short; first capacitor C, 1 capacitance is bigger; therefore can be absorbed effectively; and be stored in first capacitor C 1 with the form of electric energy, prevent that surge voltage from injecting late-class circuit and damaging to avoid circuit.
3, when surge voltage disappears; the first diode D1 ends; 1 pair first resistance R 1 of first capacitor C and second resistance R 2 are discharged, and prevent that repeatedly absorbing back first capacitor C, 1 overtension in surge voltage causes damaging, and also can improve the effect of surge protection next time simultaneously.
In embodiments of the present invention; surge protection circuit absorbs in the surge voltage of being struck by lightning or other produces when disturbing the ac input end of flyback power factor correcting device; and carrying out energy discharges; thereby avoided flyback power factor correcting device to be damaged; this surge protection circuit is effective; and simple in structure, with low cost, satisfied the requirement of user to the product high performance-price ratio.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a surge protection circuit is characterized in that, described surge protection circuit comprises:
The absorption module that surge voltage is absorbed; And
Be connected the discharge module that the electric energy that described absorption module is absorbed discharges with described absorption module.
2. surge protection circuit as claimed in claim 1; it is characterized in that; described absorption module comprises first diode and first electric capacity; the anode of described first diode is the input of described surge protection circuit; the negative electrode of described first diode connects the positive pole of first electric capacity, the minus earth of described first electric capacity.
3. surge protection circuit as claimed in claim 2; it is characterized in that; described discharge module comprises first resistance and second resistance; the positive pole of described first electric capacity of first termination of described first resistance; first end of described second resistance of second termination of described first resistance, the second end ground connection of described second resistance.
4. flyback power factor correcting device; described flyback power factor correcting device comprises flyback power factor correcting device body; described flyback power factor correcting device body comprises rectifier bridge; it is characterized in that; described flyback power factor correcting device also comprises surge protection circuit; the cathode output end of the described rectifier bridge of input termination of described surge protection circuit, described surge protection circuit comprises:
Be connected the absorption module that surge voltage is absorbed with the cathode output end of described rectifier bridge; And
Be connected the discharge module that the electric energy that described absorption module is absorbed discharges with described absorption module.
5. flyback power factor correcting device as claimed in claim 4, it is characterized in that, described absorption module comprises first diode and first electric capacity, the anode of described first diode connects the cathode output end of described rectifier bridge, the negative electrode of described first diode connects the positive pole of first electric capacity, the minus earth of described first electric capacity.
6. flyback power factor correcting device as claimed in claim 5, it is characterized in that, described discharge module comprises first resistance and second resistance, the positive pole of described first electric capacity of first termination of described first resistance, first end of described second resistance of second termination of described first resistance, the second end ground connection of described second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101897085A CN101997310A (en) | 2009-08-24 | 2009-08-24 | Surge protection circuit and flyback power factor correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101897085A CN101997310A (en) | 2009-08-24 | 2009-08-24 | Surge protection circuit and flyback power factor correction device |
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| Publication Number | Publication Date |
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| CN101997310A true CN101997310A (en) | 2011-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2009101897085A Pending CN101997310A (en) | 2009-08-24 | 2009-08-24 | Surge protection circuit and flyback power factor correction device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594112A (en) * | 2012-03-01 | 2012-07-18 | 杭州乐图光电科技有限公司 | Anti-lightning surge circuit of switching power supply and switching power supply using same |
| CN102957136A (en) * | 2011-08-19 | 2013-03-06 | 登丰微电子股份有限公司 | Load driving circuit with inrush current protection |
| CN103427698A (en) * | 2012-05-14 | 2013-12-04 | 海洋王照明科技股份有限公司 | Frequency changer circuit |
| CN109274279A (en) * | 2017-07-17 | 2019-01-25 | 台达电子工业股份有限公司 | power supply |
| CN114337235A (en) * | 2021-11-25 | 2022-04-12 | 华为数字能源技术有限公司 | Power supply and power control method for preventing surge and lightning strike |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949234A (en) * | 1989-04-17 | 1990-08-14 | Zdzislaw Gulczynski | High efficiency power factor correction circuit |
| CN1276641A (en) * | 1999-06-02 | 2000-12-13 | 尹顿公司 | Surge suppressing circuit capable of responding power disturbance change rate |
| CN101227779A (en) * | 2008-01-29 | 2008-07-23 | 电子科技大学 | Insulation type general use illumination LED driving circuit |
| CN201150031Y (en) * | 2007-12-21 | 2008-11-12 | 毛灿豪 | A switching power supply |
-
2009
- 2009-08-24 CN CN2009101897085A patent/CN101997310A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949234A (en) * | 1989-04-17 | 1990-08-14 | Zdzislaw Gulczynski | High efficiency power factor correction circuit |
| CN1276641A (en) * | 1999-06-02 | 2000-12-13 | 尹顿公司 | Surge suppressing circuit capable of responding power disturbance change rate |
| CN201150031Y (en) * | 2007-12-21 | 2008-11-12 | 毛灿豪 | A switching power supply |
| CN101227779A (en) * | 2008-01-29 | 2008-07-23 | 电子科技大学 | Insulation type general use illumination LED driving circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957136A (en) * | 2011-08-19 | 2013-03-06 | 登丰微电子股份有限公司 | Load driving circuit with inrush current protection |
| CN102957136B (en) * | 2011-08-19 | 2015-01-14 | 登丰微电子股份有限公司 | Load driving circuit with inrush current protection |
| CN102594112A (en) * | 2012-03-01 | 2012-07-18 | 杭州乐图光电科技有限公司 | Anti-lightning surge circuit of switching power supply and switching power supply using same |
| CN103427698A (en) * | 2012-05-14 | 2013-12-04 | 海洋王照明科技股份有限公司 | Frequency changer circuit |
| CN109274279A (en) * | 2017-07-17 | 2019-01-25 | 台达电子工业股份有限公司 | power supply |
| US10498222B2 (en) | 2017-07-17 | 2019-12-03 | Delta Electronics, Inc. | Power supply |
| CN114337235A (en) * | 2021-11-25 | 2022-04-12 | 华为数字能源技术有限公司 | Power supply and power control method for preventing surge and lightning strike |
| CN114337235B (en) * | 2021-11-25 | 2023-09-29 | 华为数字能源技术有限公司 | Power supply capable of preventing surge and lightning strike and power supply control method |
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Application publication date: 20110330 |