CN201490878U - Novel incoming current harmonic suppression circuit for switching power supplies - Google Patents
Novel incoming current harmonic suppression circuit for switching power supplies Download PDFInfo
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- CN201490878U CN201490878U CN2009201341667U CN200920134166U CN201490878U CN 201490878 U CN201490878 U CN 201490878U CN 2009201341667 U CN2009201341667 U CN 2009201341667U CN 200920134166 U CN200920134166 U CN 200920134166U CN 201490878 U CN201490878 U CN 201490878U
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- anti exciting
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Abstract
The utility model discloses a novel incoming current harmonic suppression circuit for switching power supplies. The novel incoming current harmonic suppression circuit comprises a rectification filter circuit, a main flyback converter loop, an auxiliary flyback converter loop, and a rectification filter output circuit, wherein, an AC power supply passes through a main flyback converter, a switch tube and a diode to form the main flyback converter loop after being rectified by the rectification filter circuit; the AC power supply passes through the auxiliary flyback converter, the switch tube and the diode to form the auxiliary flyback converter loop after being rectified; and the power of the main flyback converter loop and the auxiliary flyback converter loop is supplied by the rectification filter output circuit. By additionally arranging an auxiliary transducer on the basis of a conventional transducer, the power of the auxiliary transducer is supplied directly by a rectified AC power supply, so that the wave shape of incoming current can be well matched with that of input voltage. Therefore, the utility model can effectively reduce the content of harmonic waves, improves power factor, prolongs the holding time of output voltage, and reduces cost by applying the circuit.
Description
Technical field
The utility model relates to the switching power circuit technical field, relates in particular to a kind of novel switched power supply Harmonics of Input and suppresses circuit.
Background technology
Present widely used Switching Power Supply Harmonics of Input suppresses circuit three kinds, a kind of is Active Power Factor Correction (APFC), it adds what the DC-DC boost converter was formed by traditional bridge rectifier, as shown in Figure 1, its circuit basic principle, transducer is made the voltage voltage stabilizing generally by integrated circuit control by the voltage external loop, and the electric current inner looping is revised input current waveform and made power-factor improvement.This circuit is by integral control circuit, and high-frequency inductor and fast switching circuit are formed, and cost is higher.
A kind of is PPFC (Passive Power Factor Correction) (PPFC), it adds what a compensating inductance was formed by traditional bridge rectifier filtering, as shown in Figure 2, its circuit basic principle, civil power is through rectifying and wave-filtering again behind the compensating inductance, make the conduction phase angle degree of electric current widen, peak current reduces, thereby improves power factor.But shortcoming is that the volume of inductance is greatly also heavier, and caloric value is big, is easy to generate power frequency vibration and noise.For solving the problem of above-mentioned two kinds of circuit, a kind of new utility model scheme is proposed.
A kind of is single-level power factor correction (PFC) converter, it is a shared switching tube of PFC level and DC/DC level and a cover control circuit, when obtaining voltage output, realize power factor correction, as shown in Figure 3, its circuit basic principle, controller is by controlling the transmission of power of each switch periods to the feedback information of input voltage and output voltage, make power-factor improvement thereby revise input current waveform.This circuit is not owing to exchange input filter capacitor, thereby causes output holding time few; The shortcoming that output voltage power frequency ripple is big.
The utility model content
The technical problems to be solved in the utility model provides a kind of novel switched power supply Harmonics of Input and suppresses circuit.
For solving the problems of the technologies described above, the purpose of this utility model is achieved through the following technical solutions.
A kind of novel switched power supply Harmonics of Input suppresses circuit, comprise: current rectifying and wave filtering circuit, main anti exciting converter loop, auxiliary anti exciting converter loop and rectifying and wave-filtering output circuit, AC power constitutes main anti exciting converter loop by main anti exciting converter (T1), switching tube (Q1) and diode (D4) behind current rectifying and wave filtering circuit; Auxiliary anti exciting converter loop after rectification, constitutes the auxiliary converter loop through auxiliary anti exciting converter (T2), switching tube (Q1) and diode (D3) by AC power again; Main anti exciting converter loop and auxiliary anti exciting converter loop power through the rectifying and wave-filtering output circuit.
Wherein, AC power links to each other with former limit one end of main anti exciting converter (T1) through current rectifying and wave filtering circuit, the former limit other end of main anti exciting converter (T1) links to each other with the anode of diode (D4), link to each other with switching tube (Q1) grid after the negative electrode parallel connection of the negative electrode of diode (D4) and diode (D3), the source electrode of switching tube (Q1) is through resistance (R1) ground connection, and the drain electrode of switching tube (Q1) links to each other with control IC.
Wherein, AC power links to each other with an end on the former limit of auxiliary anti exciting converter (T2) after diode (D1) rectification, and the sun of the other end on the former limit of auxiliary anti exciting converter (T2) and diode (D3) grade links to each other.
The beneficial effects of the utility model are as follows:
The utility model is by increasing an auxiliary converter on existing converter basis, auxiliary converter is directly powered by the AC power behind over commutation, make input current waveform can well follow input voltage waveform, thereby effectively reduce harmonic content, improve power factor, reduce the current ripples of output, improve the retention time of output voltage.Reach the effect that reduces cost by this circuit application.
Description of drawings
Fig. 1 is that existing Active Power Factor Correction current harmonics suppresses circuit;
Fig. 2 is that existing PPFC (Passive Power Factor Correction) current harmonics suppresses circuit;
Fig. 3 is that existing single-level power factor correction current harmonics suppresses circuit;
Fig. 4 is the utility model schematic block circuit diagram;
Fig. 5 is the utility model embodiment circuit theory diagrams.
Embodiment
For ease of the utility model is further understood, now reach specific embodiment in conjunction with the accompanying drawings the utility model is described in detail.
See also shown in Figure 4ly, by auxiliary two converters powering load together of advocating peace, main converter is powered after by AC rectification filtering; Auxiliary converter by AC rectification after directly the power supply.
See also shown in Figure 5, comprise current rectifying and wave filtering circuit 501, main anti exciting converter T1, auxiliary anti exciting converter T2, diode D3, D4, switching tube Q1, control IC and rectifying and wave-filtering output circuit 502, AC power links to each other with former limit one end of main anti exciting converter T1 through current rectifying and wave filtering circuit 501, the former limit other end of main anti exciting converter T1 links to each other with the anode of diode D4, link to each other with switching tube Q1 grid after the negative electrode parallel connection of the negative electrode of diode D4 and diode D3, the source electrode of switching tube Q1 is through resistance R 1 ground connection, and the drain electrode of switching tube Q1 links to each other with control IC.AC power links to each other with an end on the former limit of auxiliary anti exciting converter T2 after diode D1 rectification, the other end on the former limit of auxiliary anti exciting converter T2 links to each other with the sun level of diode D3, and the secondary of main anti exciting converter T1 and auxiliary anti exciting converter T2 connects the rectifying and wave-filtering output circuit.
Its operation principle: AC power is through BG1, and behind the EC1 rectifying and wave-filtering, again by transformer T1, switching tube Q1 and diode D4 constitute the main converter loop, and energy is delivered to secondary by T1, through D6, and EC2, L1 obtains required DC power supply behind the EC3 rectifying and wave-filtering.Auxiliary converter is by AC power process D1, after the D2 rectification, passes through transformer T2 again, switching tube Q1 and diode D3 constitute the auxiliary converter loop, and energy is delivered to secondary by T2, through D6, EC2, L1 provides auxiliary energy for direct current output behind the EC3 rectifying and wave-filtering.Because alternating current is through D1, directly to auxiliary converter power supply, making all has electric current to exist at whole voltage waveform in the cycle after the D2 rectification, and the size of electric current can well be followed the variation of input voltage and changed, thereby can effectively reduce the content of harmonic wave, improve power factor.This circuit is by adjusting T1, and the turn ratio relation of two transformers of T2 makes T2 always work under the discontinuous operating state of electric current, thereby makes that two converter through-put power magnitude proportion are confirmable.
More than novel switched power supply Harmonics of Input provided by the utility model suppressed circuit be described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present utility model; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (3)
1. a novel switched power supply Harmonics of Input suppresses circuit, it is characterized in that, comprise: current rectifying and wave filtering circuit, main anti exciting converter loop, auxiliary anti exciting converter loop and rectifying and wave-filtering output circuit, AC power constitutes main anti exciting converter loop by main anti exciting converter (T1), switching tube (Q1) and diode (D4) behind current rectifying and wave filtering circuit; Auxiliary anti exciting converter loop after rectification, constitutes the auxiliary converter loop through auxiliary anti exciting converter (T2), switching tube (Q1) and diode (D3) by AC power again; Main anti exciting converter loop and auxiliary anti exciting converter loop power through the rectifying and wave-filtering output circuit.
2. novel switched power supply Harmonics of Input according to claim 1 suppresses circuit, it is characterized in that, AC power links to each other with former limit one end of main anti exciting converter (T1) through current rectifying and wave filtering circuit, the former limit other end of main anti exciting converter (T1) links to each other with the anode of diode (D4), link to each other with switching tube (Q1) grid after the negative electrode parallel connection of the negative electrode of diode (D4) and diode (D3), the source electrode of switching tube (Q1) is through resistance (R1) ground connection, and the drain electrode of switching tube (Q1) links to each other with control IC.
3. novel switched power supply Harmonics of Input according to claim 1 suppresses circuit, it is characterized in that, AC power links to each other with an end on the former limit of auxiliary anti exciting converter (T2) after diode (D1) rectification, and the sun of the other end on the former limit of auxiliary anti exciting converter (T2) and diode (D3) grade links to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201341667U CN201490878U (en) | 2009-07-22 | 2009-07-22 | Novel incoming current harmonic suppression circuit for switching power supplies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201341667U CN201490878U (en) | 2009-07-22 | 2009-07-22 | Novel incoming current harmonic suppression circuit for switching power supplies |
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| Publication Number | Publication Date |
|---|---|
| CN201490878U true CN201490878U (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201341667U Expired - Lifetime CN201490878U (en) | 2009-07-22 | 2009-07-22 | Novel incoming current harmonic suppression circuit for switching power supplies |
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| CN (1) | CN201490878U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611330A (en) * | 2011-12-05 | 2012-07-25 | 北京工业大学 | Low-harmonic current continuous three-phase rectifying circuit in mutual inductance energy feedback manner |
| CN102740562A (en) * | 2012-06-13 | 2012-10-17 | 青岛海信电器股份有限公司 | Power control circuit, backlight module and liquid crystal display device |
-
2009
- 2009-07-22 CN CN2009201341667U patent/CN201490878U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611330A (en) * | 2011-12-05 | 2012-07-25 | 北京工业大学 | Low-harmonic current continuous three-phase rectifying circuit in mutual inductance energy feedback manner |
| CN102611330B (en) * | 2011-12-05 | 2014-07-02 | 北京工业大学 | Low-harmonic current continuous three-phase rectifying circuit in mutual inductance energy feedback manner |
| CN102740562A (en) * | 2012-06-13 | 2012-10-17 | 青岛海信电器股份有限公司 | Power control circuit, backlight module and liquid crystal display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN MEGMEET ELECTRICAL CO., LTD. Free format text: FORMER NAME: SHENZHEN MEGMEET ELECTRICAL TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 6 Building 2, building 18, Arts crafts emporium, Shennan Road, Shekou, Guangdong, Shenzhen 518053, China Patentee after: Shenzhen Megmeet Electrical Co., Ltd. Address before: 6 Building 2, building 18, Arts crafts emporium, Shennan Road, Shekou, Guangdong, Shenzhen 518053, China Patentee before: Shenzhen Megmeet Electrical Technology Co., Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 518057, Shenzhen science and technology zone, Guangdong, Nanshan District Province, 13 North Road, Thunis Road, 5,A;B;C501-C503;D;E Patentee after: Shenzhen Megmeet Electrical Co., Ltd. Address before: 6 Building 2, building 18, Arts crafts emporium, Shennan Road, Shekou, Guangdong, Shenzhen 518053, China Patentee before: Shenzhen Megmeet Electrical Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100526 |
|
| CX01 | Expiry of patent term |