CN102638181A - Rectifier circuit - Google Patents
Rectifier circuit Download PDFInfo
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- CN102638181A CN102638181A CN2012100727962A CN201210072796A CN102638181A CN 102638181 A CN102638181 A CN 102638181A CN 2012100727962 A CN2012100727962 A CN 2012100727962A CN 201210072796 A CN201210072796 A CN 201210072796A CN 102638181 A CN102638181 A CN 102638181A
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- filter capacitor
- diode
- schottky diode
- voltage
- output
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Abstract
The invention relates to a rectifier circuit, which comprises a Schottky diode and a filtering capacitor. A serial connection structure consisting of two diode wafers is packaged in the Schottky diode and provided with three pins including an anode of the Schottky diode, a cathode of the Schottky diode and a serial connection output pole of the two diode wafers. The rectifier circuit has the advantages that the rectifier circuit is low in cost, space-saving, beneficial to miniaturization, high in cross regulation rate, capable of reducing rectifier diode withstand voltage, and the like. Further, the problem of EMI (electromagnetic interference) is well solved.
Description
Technical field
The present invention relates to the rectification circuit field, the rectification circuit that uses in particularly a kind of Switching Power Supply.
Background technology
Industries such as present LCD TV power supply, mainboard is generally all used+5V, and+12V supplies power.The rectification circuit of present Switching Power Supply is as shown in Figure 1, comes rectification through two Schottky diodes of common needs behind the voltage stabilizing circuit, and is as shown in the figure; + 5 D1, D2 of+12V, the encapsulation of each Schottky diode contains the Schottky diode that two diode wafers are formed parallel connection; As shown in Figure 1; Two half-wave rectifying circuits are arranged here, and one is the half-wave rectifying circuit that the 12V power supply uses, and one is the half-wave rectifying circuit that the 5V power supply uses.Wherein, to use Schottky diode be that to use Schottky diode be the Schottky 10100 of 10A100V as specification for Schottky 2045,12 power supplys of 20A45V as specification to 5 power supplys.
Present rectification circuit has following deficiency:
1, cost is high, and it is big to take the pcb board space, causes raw-material waste.
2, intersection adjustment rate variance.
3 ,+12 the rectifying schottky pipe needs 100V (with anti-sharp topology type of being)
Summary of the invention
The present invention is in order to overcome industries such as present LCD TV power supply, mainboard+5V, in the power supply of+12V, the above-mentioned deficiency of rectification circuit provides a kind of novel rectification circuit.
The present invention for realizing the technical scheme that its purpose adopts is: a kind of rectification circuit, be arranged on the two ends of first secondary coil and the second subprime coil of transformer, and export first voltage and second voltage, comprise Schottky diode and filter capacitor.
Be provided with the series arrangement that two diode wafers are formed in the described Schottky diode encapsulation, described series arrangement has three pins, is respectively the anode of Schottky diode, negative electrode and two diode wafer polyphone output stages.
Described filter capacitor comprises second filter capacitor, the 4th filter capacitor.
Described first voltage is higher than second voltage;
The in-phase end of described first secondary coil links to each other with an end of described the 4th filter capacitor; Two diode wafer polyphone output stages of the said Schottky diode of another termination of described the 4th filter capacitor; The negative electrode of described Schottky diode connects the out-phase end of described first secondary coil, and the in-phase end of described first secondary coil is exactly described first voltage output end of output;
The in-phase end of described second subprime coil links to each other with the anode of described Schottky diode; Two diode wafer polyphone output stages of said Schottky diode connect an end of described second filter capacitor, the out-phase end and the ground connection of the described second subprime coil of another termination of described second filter capacitor; Two diode wafer polyphone output stages of described said Schottky diode are exactly described second voltage output end of output.
Further, in the above-mentioned rectification circuit: also comprise the 3rd filter capacitor, described the 3rd filter capacitor is arranged between described first voltage output end and the ground.Described second filter capacitor, the 3rd filter capacitor and the 4th filter capacitor all are electrochemical capacitors.The anode of described second filter capacitor connects two diode wafer polyphone output stages of said Schottky diode; The anode respectively of described the 3rd filter capacitor and four filter capacitors connects the in-phase end of described second subprime coil.
The present invention has following advantage:
1. cost is low, can save a rectifier diode. and conserve space is beneficial to miniaturization.
2. the regulation of intersecting is good.
3. the first voltage commutation pipe is withstand voltage reduces greatly.
4. Schottky diode is the mode of two plates serial connection in the encapsulation, and the diode radiating sheet is connected on 2 pin, good solution the EMI interference problem.
Description of drawings
Fig. 1 is present Switching Power Supply rectification circuit schematic diagram.
Fig. 2 is a power rectifier circuit schematic diagram of the present invention.
Embodiment
The voltage stabilizing circuit of present embodiment and of the prior art as broad as long; The structure of transformer is also identical, and the in-phase end 1 of original grade coil T1A connects driving tube, and out-phase end 2 meets the first filter capacitor EC1; Have two secondary coils, dividing is the first secondary coil T1B and second subprime coil T1C in addition.
The 12V voltage output end is arranged on the first secondary coil two ends of transformer; The 5V voltage output end is arranged on the two ends of second subprime coil; Present embodiment mainly is with the difference of the rectification circuit that uses at present: be provided with the series arrangement that two diode wafers are formed in the Schottky diode D1 encapsulation; Series arrangement has three pins, is respectively the anode 7 of Schottky diode D1, negative electrode 9 and two diode wafer polyphone output stages 8; Filter capacitor all is an electrochemical capacitor, comprises the second filter capacitor EC2, the 3rd filter capacitor EC3 and the 4th filter capacitor EC4.
In the present embodiment; The in-phase end 3 of the first secondary coil T1B links to each other with the anode of the 4th filter capacitor EC4; The negative electrode of the 4th filter capacitor EC4 connects two diode wafer polyphone output stages 8 of Schottky diode D1; The negative electrode 9 of Schottky diode D1 connects the out-phase end 4 of the first secondary coil T1B, forms article one loop of present embodiment, and the output voltage of generation is from the anode output of the 4th filter capacitor EC4 of electrochemical capacitor.
The in-phase end 5 of second subprime coil T1C links to each other with the anode 7 of Schottky diode D1; Two diode wafer polyphone output stages 8 of Schottky diode D1 connect the anode of the second filter capacitor EC2, and the negative electrode of the second filter capacitor EC2 connects out-phase end 6 and the ground connection of second subprime coil T1C; The second loop of forming present embodiment, the voltage of 5V is from the anode output of the second filter capacitor EC2.
Article one loop of present embodiment and the output in second loop stack become the output of 12V power supply, between 12V output and ground, insert the 3rd filter capacitor EC3, and the anode of EC3 meets 12V.
Having used two secondary coils in the present embodiment is respectively 5V Transformer Winding and 7V Transformer Winding, because the negative electrode of the 4th filter capacitor EC4 connects the anode of the second filter capacitor EC2, therefore, the voltage of first output is 12V.
The rectification circuit of present embodiment also has plurality of applications, changes like the number of turn with two Secondary winding of transformer, can export a lot of voltage, such as 24V, 12V, 5V etc.
Claims (3)
1. rectification circuit is arranged on the two ends of first secondary coil and the second subprime coil of transformer, exports first voltage and second voltage, comprises Schottky diode and filter capacitor, it is characterized in that:
Be provided with the series arrangement that two diode wafers are formed in described Schottky diode (D1) encapsulation; Described series arrangement has three pins; Be respectively the anode (7) of Schottky diode (D1), negative electrode (9) and two diode wafer polyphone output stages (8);
Described filter capacitor comprises second filter capacitor (EC2), the 4th filter capacitor (EC4);
Described first voltage is higher than second voltage;
The in-phase end (3) of described first secondary coil (T1B) links to each other with an end of described the 4th filter capacitor (EC4); Two diode wafer polyphone output stages (8) of the said Schottky diode of another termination (D1) of described the 4th filter capacitor (EC4); The negative electrode (9) of described Schottky diode (D1) connects the out-phase end (4) of described first secondary coil (T1B), and the in-phase end (3) of described first secondary coil (T1B) is exactly described first voltage output end of output;
The in-phase end (5) of described second subprime coil (T1C) links to each other with the anode (7) of described Schottky diode (D1); Two diode wafer polyphone output stages (8) of said Schottky diode (D1) connect an end of described second filter capacitor (EC2), the out-phase end (6) and the ground connection of the described second subprime coil of another termination of described second filter capacitor (EC2) (T1C); Two diode wafer polyphone output stages (8) of described said Schottky diode (D1) are exactly described second voltage output end of output.
2. rectification circuit according to claim 1 is characterized in that: also comprise the 3rd filter capacitor (EC3), described the 3rd filter capacitor is arranged between described first voltage output end and the ground.
3. rectification circuit according to claim 2 is characterized in that: described second filter capacitor (EC2), the 3rd filter capacitor (EC3) and the 4th filter capacitor (EC4) all are electrochemical capacitors;
The anode of described second filter capacitor (EC2) connects two diode wafer polyphone output stages (8) of said Schottky diode (D1);
The anode respectively of described the 3rd filter capacitor (EC3) and four filter capacitors (EC4) connects the in-phase end (5) of described second subprime coil (T1C).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100727962A CN102638181A (en) | 2012-03-19 | 2012-03-19 | Rectifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100727962A CN102638181A (en) | 2012-03-19 | 2012-03-19 | Rectifier circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102638181A true CN102638181A (en) | 2012-08-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100727962A Pending CN102638181A (en) | 2012-03-19 | 2012-03-19 | Rectifier circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143918A (en) * | 2013-05-06 | 2014-11-12 | Tdk株式会社 | Power circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004248414A (en) * | 2003-02-14 | 2004-09-02 | Eastern Co Ltd | Dc power unit |
| WO2006054444A1 (en) * | 2004-11-19 | 2006-05-26 | Cosel Co., Ltd. | Multioutput switching power supply |
| TW201201493A (en) * | 2010-06-21 | 2012-01-01 | Niko Semiconductor Co Ltd | Flyback power converter with multi-output and a secondary side post regulator thereof |
| CN202488364U (en) * | 2012-03-19 | 2012-10-10 | 深圳麦格米特电气股份有限公司 | Rectifying circuit |
-
2012
- 2012-03-19 CN CN2012100727962A patent/CN102638181A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004248414A (en) * | 2003-02-14 | 2004-09-02 | Eastern Co Ltd | Dc power unit |
| WO2006054444A1 (en) * | 2004-11-19 | 2006-05-26 | Cosel Co., Ltd. | Multioutput switching power supply |
| TW201201493A (en) * | 2010-06-21 | 2012-01-01 | Niko Semiconductor Co Ltd | Flyback power converter with multi-output and a secondary side post regulator thereof |
| CN202488364U (en) * | 2012-03-19 | 2012-10-10 | 深圳麦格米特电气股份有限公司 | Rectifying circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143918A (en) * | 2013-05-06 | 2014-11-12 | Tdk株式会社 | Power circuit |
| US9438124B2 (en) | 2013-05-06 | 2016-09-06 | Tdk Corporation | Power supply circuit |
| CN104143918B (en) * | 2013-05-06 | 2017-06-13 | Tdk株式会社 | Power circuit |
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Application publication date: 20120815 |