CN104467465A - Dual-half wave rectifying circuit for bridge type switching power supply - Google Patents
Dual-half wave rectifying circuit for bridge type switching power supply Download PDFInfo
- Publication number
- CN104467465A CN104467465A CN201310431481.7A CN201310431481A CN104467465A CN 104467465 A CN104467465 A CN 104467465A CN 201310431481 A CN201310431481 A CN 201310431481A CN 104467465 A CN104467465 A CN 104467465A
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- Prior art keywords
- diode
- inductance
- transformer
- inductor
- power supply
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
Abstract
A dual-half wave rectifying circuit for a bridge type switching power supply comprises a transformer, a first inductor, a second inductor, a first diode, a second diode and a capacitor, wherein the common connection terminal of the first inductor and the second inductor is connected with a negative plate of the capacitor, the non-common terminals of the first inductor and the second inductor are connected with the positive electrode of the first diode and the positive electrode of the second diode, the negative electrode of the first diode and the negative electrode of the second diode are both connected with a positive plate of the capacitor, the positive electrode of the first diode and the positive electrode of the second diode are connected with the two ends of a secondary coil of the transformer respectively, and the capacitor is a ceramic capacitor. By the adoption of the circuit, direct current magnetization caused by counteraction failure of the direct current component in the secondary coil due to the fact that the magnetic structure is asymmetric is avoided, the capacity of the transformer is reduced, the structure of the circuit is simplified, power consumption is reduced, and the size of the transformer is reduced.
Description
Technical field
The invention belongs to electronic circuit field, relate to a kind of double half-wave rectification circuit being applied to bridge switch power supply.
Background technology
Low pressure export recommend, in bridge-type, semi-bridge switching voltage regulator circuit, the secondary of transformer adopt traditional pair of Half bridge rectifier circuit more.But the complex structure of transformer in this circuit, and require that the capacity relative of transformer is larger.The modified model double half-wave rectification circuit introduced herein can realize recommending, the simplification of the circuit structure such as bridge-type, semibridge system improve isolating transformer utilance.The operation principle of the two kinds of rectification circuits of comparative analysis below.
In traditional double half-wave rectifying circuit, transformer secondary coil centre cap connects output negative terminal.Secondary coil is divided into two opposite polarity potential sources and leakage inductance by centre cap.But their magnetic structure but can not reach perfect condition, and two leakage inductances are due to can not be completely equal and the normal work of initial deviation to circuit that is that produce has a significant impact.In addition, primary coil short circuit because of afterflow of isolating transformer, during this, afterflow distributes the electric current in secondary coil also has impact.
Summary of the invention
Perfect condition can not be reached affect for solving traditional double halfwave rectifier secondary coil magnetic structure the technological deficiency that circuit normally works, the invention provides a kind of double half-wave rectification circuit being applied to bridge switch power supply.
Be applied to the double half-wave rectification circuit of bridge switch power supply, comprise transformer, also comprise the first inductance, the second inductance, the first diode, the second diode and electric capacity;
Described first inductance is connected with electric capacity negative plate with the connection common port of the second inductance, first inductance is connected the positive pole of the first diode and the second diode respectively with the not common end of the second inductance, and described first diode is all connected with capacitance cathode plate with the negative pole of the second diode; The positive pole of described first diode and the second diode also distinguishes the different two ends of connection transformer secondary coil.
Preferably, described first diode and/or the second diode are Schottky diode.
Preferably, the inductance value of described first inductance and the second inductance is equal.
The double half-wave rectification circuit being applied to bridge switch power supply of the present invention, eliminates DC component in the secondary coil caused because magnetic structure is asymmetric and can not offset and the DC magnetization problem produced.And reduce the capacity of transformer, simplify the structure of circuit, and reduce power consumption, reduce the size of transformer.
Accompanying drawing explanation
Fig. 1 illustrates the present invention's embodiment schematic diagram.
Embodiment
Below provide the present invention's embodiment.
Be applied to the double half-wave rectification circuit of bridge switch power supply, comprise transformer, also comprise the first inductance, the second inductance, the first diode, the second diode and electric capacity; Described first inductance is connected with electric capacity negative plate with the connection common port of the second inductance, first inductance is connected the positive pole of the first diode and the second diode respectively with the not common end of the second inductance, and described first diode is all connected with capacitance cathode plate with the negative pole of the second diode; The positive pole of described first diode and the second diode also distinguishes the different two ends of connection transformer secondary coil, and described electric capacity is ceramic condenser.
As shown in Figure 1, in figure, the first inductance is L1, and the second inductance is L2, and the first diode is VD1, and the second diode is VD2.The course of work of this circuit is: in the positive half cycle valid period of each work period, transformer secondary coil both end voltage U2 is just, the conducting of VD1 positively biased, the reverse-biased blocking-up of VD2, and VD1 is in rectification and afterflow operating state simultaneously.L1 is by VD1, path continuous current discharge electricity.The electric current of L2 flows through the secondary coil of transformer, forms closed-loop path with VD1, C.Output current is the summation of DC component of two filter inductance electric current I L1, IL2.Transformer has only flow through the half of load current within the positive half cycle valid period, and L1 both end voltage UL1 is negative value, and IL1 reduces gradually, and L2 both end voltage UL2 is just, IL2 increases.After the positive half cycle valid period, the thing followed is an afterflow interval, and U2 voltage is that 0, I2 quickly falls to 0.VD2 conducting forms the freewheeling path of L2, and IL1 continues to reduce, and UL2 becomes negative value, and IL2 reduces thereupon.When the negative half period valid period arrives, transformer secondary coil voltage U 2 becomes negative, and VD2 is in positively biased conducting, the reverse-biased blocking-up of VD1.In like manner, VD2 also has the effect of rectification and afterflow simultaneously, and on transformer secondary coil, electric current I2 changes direction rapidly, and its size equals the current value IL1 on L1.In VD2 switching process, transformer secondary coil, VD2, C and L1 form loop, and L1 both end voltage UL1 is just becoming, L1 energy storage, and electric current I L1 starts to increase.L2 is by VD2 afterflow release energy storage, and IL2 electric current declines, and when U2 is 0 again, afterflow again starts, and L1 both end voltage UL1 becomes negative, and IL1 is reduced, and the electric current of L2 still keeps declining.Then said process is repeated.Output voltage UO is obtained from electric capacity C two ends.
Above-describedly be only the preferred embodiments of the present invention; described embodiment is also not used to limit scope of patent protection of the present invention; therefore the equivalent structure that every utilization specification of the present invention and accompanying drawing content are done changes, and in like manner all should be included in protection scope of the present invention.
Claims (3)
1. be applied to the double half-wave rectification circuit of bridge switch power supply, comprise transformer, it is characterized in that, also comprise the first inductance, the second inductance, the first diode, the second diode and electric capacity;
Described first inductance is connected with electric capacity negative plate with the connection common port of the second inductance, first inductance is connected the positive pole of the first diode and the second diode respectively with the not common end of the second inductance, and described first diode is all connected with capacitance cathode plate with the negative pole of the second diode; The positive pole of described first diode and the second diode also distinguishes the different two ends of connection transformer secondary coil, and described electric capacity is ceramic condenser.
2. be applied to a double half-wave rectification circuit for bridge switch power supply as claimed in claim 1, it is characterized in that, described first diode and/or the second diode are Schottky diode.
3. be applied to a double half-wave rectification circuit for bridge switch power supply as claimed in claim 1, it is characterized in that, the inductance value of described first inductance and the second inductance is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310431481.7A CN104467465A (en) | 2013-09-22 | 2013-09-22 | Dual-half wave rectifying circuit for bridge type switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310431481.7A CN104467465A (en) | 2013-09-22 | 2013-09-22 | Dual-half wave rectifying circuit for bridge type switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104467465A true CN104467465A (en) | 2015-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310431481.7A Pending CN104467465A (en) | 2013-09-22 | 2013-09-22 | Dual-half wave rectifying circuit for bridge type switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104467465A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935150A (en) * | 2015-06-15 | 2015-09-23 | 成都广迈科技有限公司 | Frequency converter |
| CN113162439A (en) * | 2021-03-12 | 2021-07-23 | 深圳原能电器有限公司 | Half-wave symmetric converter and control method |
-
2013
- 2013-09-22 CN CN201310431481.7A patent/CN104467465A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935150A (en) * | 2015-06-15 | 2015-09-23 | 成都广迈科技有限公司 | Frequency converter |
| CN113162439A (en) * | 2021-03-12 | 2021-07-23 | 深圳原能电器有限公司 | Half-wave symmetric converter and control method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |