CN1144344C - Step-up transformer - Google Patents
Step-up transformer Download PDFInfo
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- CN1144344C CN1144344C CNB021151350A CN02115135A CN1144344C CN 1144344 C CN1144344 C CN 1144344C CN B021151350 A CNB021151350 A CN B021151350A CN 02115135 A CN02115135 A CN 02115135A CN 1144344 C CN1144344 C CN 1144344C
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Abstract
The present invention discloses a booster converter which comprises an inductor, a flywheel diode, an output capacitor, a power switch and a storage circuit, wherein the storage circuit comprises an auxiliary inductor, a storage capacitor, a first switching tube and a second switching tube; the second switching tube is connected with the storage capacitor in parallel, and the direction of the second switching tube is identical to the flywheel diode; when the power switch is switched on, the auxiliary inductor, the storage capacitor, the flywheel diode, the power switch and the output capacitor form a storage loop; the energy of a reverse recovery current is stored in the storage circuit; the auxiliary inductor, the storage capacitor and the first switching tube form an energy transfer resonant loop; when the power switch is switched off, the auxiliary inductor, the storage capacitor, the flywheel diode and the output capacitor form an energy output loop; energy passing through the energy transfer resonant loop is transferred to the output capacitor by the energy output loop. The energy loss is reduced and the efficiency of the whole circuit is increased. The peak voltage stress of the flywheel diode is clamped at Vo, so the pressurization requirements of the flywheel diode are reduced.
Description
Technical field:
The present invention relates to a kind of booster converter (being the BOOST converter).
Technical background:
Single-phase circuit of power factor correction (PFC) is widely used in communication power supply, in the switch power supply equipment of civil powers such as UPS input, can realize making input current to satisfy the relevant harmonic standard requirement of IEC, makes power factor be approximately 1 simultaneously.Circuit of power factor correction adopts booster converter to realize usually, traditional booster converter as shown in Figure 1, for connecting with sustained diode and output capacitance Co, inductance L m constitutes continuous current circuit, at sustained diode that is in series and output capacitance Co two ends power switch S1 in parallel, the operation principle of traditional booster converter is as follows: 1. opening and turn-offing by power controlling switch S 1, come the duty ratio of power controlling switch S 1, thereby realize the boost function and the voltage regulation function of output voltage; Its voltage equation is: V0=VIN/d; (d is the duty ratio of power switch S1, and V0 is an output voltage, and VIN is an input voltage); 2. when power switch S1 conducting, line voltage is added in inductance L m two ends, gives inductance L m charging energy storage, and inductance L m electric current rises, and this moment, sustained diode was oppositely ended; 3. when power switch S1 turn-offs because inductance L m inductive current can not suddenly change, the sustained diode conducting, line voltage connect with inductance L m, electric current through sustained diode to output capacitance and electric, the decline of inductance L m electric current.But traditional BOOST circuit exists following problem: when power switch S1 turn-offed, the forward conduction electric current was flow through in the sustained diode conducting.When power switch S1 conducting, sustained diode is born reverse voltage, because diode exists reverse recovery Effects, sustained diode can't be ended at once, flows through sustained diode and have current reversal, forms reverse recovery current.Reverse recovery current flows through power switch S1 with inductance L m, thereby has increased the turn-on consumption of power switch S1 and the loss of sustained diode.When output voltage is high more,, make the problems referred to above more serious because the reverse recovery time of high-voltage diode is longer.The switching frequency of power switch S1 is high more, and then the loss that causes of reverse recovery current is big more; The distinctive problem of foregoing circuit has limited the raising of circuit work frequency.
Summary of the invention:
The objective of the invention is in order to reduce reverse recovery current, and reduce because the loss that reverse recovery current causes, improve the operating efficiency of booster converter.
To achieve these goals, the concrete scheme that the present invention proposes is as follows: a kind of booster converter, comprise inductance L m, sustained diode, output capacitance Co and power switch S1, during power switch S1 conducting, input voltage vin, power switch S1 and inductance L m are positioned on the charge circuit, when power switch S1 disconnected, input voltage vin, sustained diode and output capacitance Co were positioned on the forward continuous current circuit, and sustained diode is at this loop forward conduction; Described booster converter also comprises accumulator, and described accumulator comprises auxiliary induction Ls, storage capacitor C
b, the first switching tube D1 and second switch pipe D2, its annexation is as follows:
By turn-offing conducting constantly, the reverse recovery current of sustained diode flows along the tank circuit that auxiliary induction Ls, storage capacitor Cb, sustained diode, power switch S1 and output capacitance Co are constituted at power switch S1; Oppositely recovering energy is stored among storage capacitor Cb and the auxiliary induction Ls;
After reverse recovery phenomena finished, the energy among the auxiliary induction Ls shifted resonant tank through the energy that auxiliary induction Ls, storage capacitor Cb and the first switching tube D1 are constituted, and is transferred among the storage capacitor Cb;
By the moment that is conducting to shutoff, the energy output loop that the energy among the storage capacitor Cb is constituted by inductance L m, storage capacitor Cb, sustained diode and output capacitance Co is transferred to energy among the output capacitance Co at power switch S1;
Described second switch pipe D2 is in parallel with storage capacitor Cb, and direction is identical with sustained diode.
The present invention is owing to adopt such scheme, auxiliary induction is connected with sustained diode and has been reduced reverse recovery current, by increasing a special accumulator, the reverse recovery current store energy in accumulator, have no progeny when power switch S1 closes, accumulator is transferred to the reverse recovery current energy that stores on the output capacitance.Reduced energy loss, thereby improved the efficient of entire circuit, in addition, the peak voltage stress of sustained diode is clamped at V0, thereby has reduced the requirement of withstand voltage of sustained diode.
Description of drawings:
Be illustrated in figure 1 as existing boost converter circuit schematic diagram;
Be illustrated in figure 2 as the first instantiation circuit diagram of booster converter of the present invention;
Be illustrated in figure 3 as the second instantiation circuit diagram of booster converter of the present invention;
Be illustrated in figure 4 as the 3rd instantiation circuit diagram of booster converter of the present invention;
Be illustrated in figure 5 as the 4th instantiation circuit diagram of booster converter of the present invention;
Be illustrated in figure 6 as the 5th instantiation circuit diagram of booster converter of the present invention;
Embodiment:
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Be illustrated in figure 1 as existing boost converter circuit schematic diagram.Then shown in Fig. 2 to 6, the present invention has increased an accumulator to several embodiments of the present invention on the basis of existing technology, and this accumulator comprises auxiliary induction Ls, storage capacitor C
b, the first switching tube D1 and second switch pipe D2, by turn-offing conducting constantly, the reverse recovery current of sustained diode flows along the tank circuit that auxiliary induction Ls, storage capacitor Cb, sustained diode, power switch S1 and output capacitance Co are constituted at power switch S1; Oppositely recovering energy is stored among storage capacitor Cb and the auxiliary induction Ls;
After reverse recovery phenomena finished, the energy among the auxiliary induction Ls was transferred among the storage capacitor Cb through the resonant tank that auxiliary induction Ls, storage capacitor Cb and the first switching tube D1 are constituted;
By the moment that is conducting to shutoff, the energy output loop that the energy among the storage capacitor Cb is constituted by inductance L m, storage capacitor Cb, sustained diode and output capacitance Co is transferred to energy among the output capacitance Co at power switch S1;
Described second switch pipe D2 is in parallel with storage capacitor Cb, and direction is identical with sustained diode.
A specific embodiment as shown in Figure 4, contact and the power switch S1 of described first switching tube D1 and auxiliary induction Ls link, the contact of storage capacitor Cb and auxiliary induction Ls links to each other with inductance L m.By the moment that is conducting to shutoff, the energy among the storage capacitor Cb is transferred to energy among the output capacitance Co by the energy output loop that inductance L m, storage capacitor Cb, sustained diode and output capacitance Co are constituted at power switch S1.
In addition shown in Fig. 2 and 3, the end of the described first switching tube D1 links with auxiliary induction Ls and power switch S1 one end respectively respectively for two embodiment, and the other end of the first switching tube D1 links to each other with sustained diode.
Again two embodiment as illustrated in Figures 5 and 6, the end of the first switching tube D1 links to each other with sustained diode, the other end links to each other with output capacitance Co.
Wherein, the first switching tube D1 and second switch pipe D2 can be diode.When the first switching tube D1 and second switch pipe D2 were diode, the positive negative direction of diode made tank circuit 1, energy shift resonant tank 2 and energy output loop 3 is in the normally state.Wherein said second switch pipe D2 is the little Schottky tube of on-state loss, and its second switch pipe D2 is that no-voltage is turn-offed.
For a better understanding of the present invention, be that example is described in further detail operation principle of the present invention below with embodiment illustrated in fig. 2.For other embodiment, in like manner also can make similar principle Analysis.
In order to simplify circuit analysis, in a switch periods, can make the following assumptions:
1. output capacitance is enough big, can think that output voltage V 0 is invariable direct voltage;
2. except sustained diode, all power devices all are desirable devices;
3. inductance L m is much larger than auxiliary induction Ls;
4. input voltage vin is a constant;
Based on above-mentioned assumed condition, we can be divided into 6 time periods to a circuit working cycle and analyze respectively:
Phase I (t0--t1):
Switch power switch S 1 is in t0 conducting constantly, and sustained diode has reverse recovery current to flow through, and auxiliary induction Ls connects with sustained diode and reduces reverse recovery current, and reverse recovery current flows along tank circuit 1 (C0--D--Cb--Ls--S1--C0).
Second stage (t1--t2)
Sustained diode is ended constantly at t1, and reverse recovery phenomena finishes.This moment, the storage power of auxiliary induction Ls was
Be the reverse recovery current maximum; Because the storage power of storage capacitor Cb is
Compare very little with the storage power of auxiliary induction Ls, first switching tube D1 nature conducting this moment of can ignoring, electric current shifts resonant tank 2 (Ls--D1-Cb) along energy and flows, and forms the resonance path, the reverse recovery energy of the storage of auxiliary induction Ls is all transferred to storage capacitor Cb get on.Voltage clamp on the sustained diode is at V at this moment
0Voltage.
Phase III (t2--t3)
At t2 constantly, the electric current of auxiliary induction Ls drops to 0, the first switching tube D1 to be ended, and this moment, storage capacitor Cb energy stored was
Storage capacitor Cb voltage remains unchanged, and enters the power switch S1 conducting operating state of normal pfc circuit.Voltage on the sustained diode is V0-V at this moment
Cb
Quadravalence section (t3--t4)
At t3 constantly, switch power switch S 1 is turn-offed, because inductance L m electric current I
FCan not suddenly change the first switching tube D1 and sustained diode conducting, electric current I
FFlow to output capacitance C0 along the first switching tube D1 and sustained diode, simultaneously, electric current flows along energy output loop 3 (Lm-Ls-Cb-D-Co), form the resonance path, auxiliary induction Ls electric current is constantly increased, storage capacitor Cb voltage constantly reduces, and the electric current on the first switching tube D1 branch road is transferred on the auxiliary induction Ls branch road gradually.
Five-stage (t4--t5)
At t4 constantly, auxiliary induction Ls electric current is increased to inductance L m electricity I
F, electric current is all transferred on the auxiliary induction Ls branch road, and the first switching tube D1 ends naturally, and electric current I F flows along energy output loop 3 (Lm-Ls-Cb-D-Co) constant current, and storage capacitor Cb voltage continues to reduce.
The 6th stage (t5--t6)
At t5 constantly, storage capacitor Cb voltage drops to 0, the conducting of second switch pipe D2 nature, and the power switch S1 that enters normal pfc circuit closes the intermittent current operating state.This moment, storage capacitor Cb 0 remained unchanged.
Can know from above-mentioned circuit theory analysis, the present invention adopts an auxiliary induction to connect with sustained diode to reduce reverse recovery current, by increasing a special accumulator, the reverse recovery current store energy in accumulator, have no progeny when power switch S1 closes, accumulator is transferred to the reverse recovery current energy that stores on the output capacitance.As seen the reverse recovery current energy is all transferred on the output capacitance, does not cause energy loss, thereby has improved the efficient of entire circuit.
From last surface analysis as can be known, the peak voltage stress of sustained diode is clamped at V0, and is irrelevant with resonance potential Vcb, thereby reduced the requirement of withstand voltage of sustained diode.
The second switch pipe D2 peak voltage stress of connecting with main sustained diode equals resonance potential Vcb, voltage is lower, can adopt withstand voltage low, but the Schottky tube that on-state loss is little etc., second switch pipe D2 is that ZVS turn-offs in addition, and no reverse recovery current is so the loss of second switch pipe D2 is compared with the circuit loss that circuit of the present invention is reduced, ratio is very little, can ignore.Thereby reduced circuit loss, improved the efficient of entire circuit.
Claims (6)
1, a kind of booster converter, comprise inductance (Lm), fly-wheel diode (D), output capacitance (Co) and power switch (S1), during power switch (S1) conducting, input voltage (Vin), power switch (S1) and inductance (Lm) are positioned on the charge circuit, when power switch (S1) disconnects, input voltage (Vin), fly-wheel diode (D) and output capacitance (Co) are positioned on the forward continuous current circuit, and fly-wheel diode (D) is at this loop forward conduction; It is characterized in that: described booster converter also comprises accumulator, and described accumulator comprises auxiliary induction (Ls), storage capacitor (Cb), first switching tube (D1) and second switch pipe (D2), and its annexation is as follows:
At power switch (S1) by turn-offing conducting constantly, auxiliary induction (Ls), storage capacitor (Cb), fly-wheel diode (D), power switch (S1) and output capacitance (Co) constitute tank circuit, and the reverse recovery current of fly-wheel diode (D) flows along this tank circuit; Oppositely recovering energy is stored in storage capacitor (Cb) and the auxiliary induction (Ls);
After reverse recovery phenomena finished, auxiliary induction (Ls), storage capacitor (Cb) and first switching tube (D1) constituted energy and shift resonant tank, and the energy in the auxiliary induction (Ls) shifts resonant tank along this energy and flows, and is transferred in the storage capacitor (Cb);
At power switch (S1) by the moment that is conducting to shutoff, inductance (Lm), storage capacitor (Cb), fly-wheel diode (D) and output capacitance (Co) constitute the energy output loop, energy in the storage capacitor (Cb) is transferred to energy in the output capacitance (Co) by this energy output loop;
Described second switch pipe (D2) is in parallel with storage capacitor (Cb), and direction is identical with fly-wheel diode (D).
2, booster converter as claimed in claim 1 is characterized in that: the contact of described first switching tube (D1) and auxiliary induction (Ls) links to each other with power switch (S1), and the contact of storage capacitor (Cb) and auxiliary induction (Ls) links to each other with inductance (Lm).
3, booster converter as claimed in claim 1, it is characterized in that: an end of first switching tube (D1) links to each other with the contact of power switch (S1) with inductance (Lm), the other end of first switching tube (D1) links to each other with the anode of fly-wheel diode (D), and the negative electrode of fly-wheel diode (D) links to each other with output capacitance (Co).
4, booster converter as claimed in claim 1 is characterized in that: an end of first switching tube (D1) links to each other with the negative electrode of fly-wheel diode (D), and the other end links to each other with output capacitance (Co), and the anode of fly-wheel diode (D) links to each other with inductance (Lm).
5, as claim 1,2,3 or 4 described booster converters, it is characterized in that: described first switching tube (D1) and second switch pipe (D2) are diode.
6, as claim 1,2,3 or 4 described booster converters, it is characterized in that: described second switch pipe (D2) is a diode, and is the no-voltage shutoff.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021151350A CN1144344C (en) | 2002-04-17 | 2002-04-17 | Step-up transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021151350A CN1144344C (en) | 2002-04-17 | 2002-04-17 | Step-up transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1377125A CN1377125A (en) | 2002-10-30 |
| CN1144344C true CN1144344C (en) | 2004-03-31 |
Family
ID=4743470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021151350A Expired - Lifetime CN1144344C (en) | 2002-04-17 | 2002-04-17 | Step-up transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1144344C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT503964B1 (en) | 2007-01-23 | 2008-02-15 | Siemens Ag Oesterreich | Relief circuit arrangement for use in switched mode power supply, has precharging circuit charging capacitor more strongly than excessive voltage of diode while diode is switched in blocking direction with regard to amount |
| JP5321124B2 (en) * | 2009-02-23 | 2013-10-23 | 三菱電機株式会社 | Semiconductor switching device |
| DE202011102068U1 (en) * | 2011-06-07 | 2012-09-10 | Voltwerk Electronics Gmbh | Boost converter |
| CN108254675A (en) * | 2018-03-14 | 2018-07-06 | 奥克斯空调股份有限公司 | Pfc circuit failure detector, method and convertible frequency air-conditioner |
| CN114070039B (en) * | 2021-09-28 | 2023-11-14 | 山西大学 | Boost converter without reverse recovery diode for auxiliary commutation of equivalent capacitance voltage division |
-
2002
- 2002-04-17 CN CNB021151350A patent/CN1144344C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1377125A (en) | 2002-10-30 |
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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Granted publication date: 20040331 |
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| CX01 | Expiry of patent term |