CN1450714A - Converter using synchronous rectifier circuit - Google Patents
Converter using synchronous rectifier circuit Download PDFInfo
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- CN1450714A CN1450714A CN02106070A CN02106070A CN1450714A CN 1450714 A CN1450714 A CN 1450714A CN 02106070 A CN02106070 A CN 02106070A CN 02106070 A CN02106070 A CN 02106070A CN 1450714 A CN1450714 A CN 1450714A
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- transducer
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- transformer
- switch
- synchronous rectification
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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
Abstract
A converter using synchronous rectifier especially refering to a converter using synchronous rectifier combining with iC damping circuit mainly is to connect in parallel mutual-serial a resistor and a capacitor at the field effect transistor connected at one end of the converter transformer secondary coil to reduce vibration and magnetic interference. The primary coil of its transform is connected with two diodes at both ends, an inductor between the diodes, a capacitor is connected with the link point of the transformer and master switch element at the connecting end of the Inductor and one of the diode to make up an LC vibration damping circuit for resetting its transformer and realizing energy recovery.
Description
Technical field
The present invention relates to a kind of converter apparatus, especially refer to a kind ofly include synchronous rectifier and establish transducer with a LC damping circuit on it, it has eliminated the surging of transducer, and makes the transformer of transducer can realize resetting, energy is brought back to life, thereby make its improved efficiency.
Background technology
General communication system is owing to need miniaturization and high efficiency power supply module, and with the saving space and the energy, but because the conduction loss of output current on diode makes power supply module be difficult to have default efficient.In recent years, computer and perimeter equipment widespread integrated circuit, it is not only on industrial use, even all be widely used in the daily life, though high density integrated circuit equipment can have more purposes and preferable function is improved, but its power density can increase with the density of integrated circuit, and in order to save the loss of energy, the operating voltage of these integrated circuits (being the output voltage of power supply unit) should reduce as far as possible.That is to say, use at computer under the idea of low voltage and high current, caused the conduction loss of output diode in the power supply unit, therefore the efficient of power supply unit reduced.
For solving this problem, a kind of near ideal diode (having the extremely low advantage of minimum internal resistance, cut-in voltage) except developing, in fact unusual difficulty and hardly may.And field-effect transistor (MOSFET) synchronous rectifier (SR) can replace the conventional diode rectification circuit, moreover, some active clamped circuit (active clamp) can further improve the efficient of utilization field-effect transistor synchronous rectifier, uses as assisting initiatively switch and complicated drive circuit but this kind mode is essential.
As shown in Figure 1, a kind of circuit diagram that makes the single-ended consequent converter of field-effect transistors synchronous rectifier circuit is shown, switch S 2 in this circuit includes field-effect transistor Q1 and parasitic diode D1 thereof as rectification, the field-effect transistor Q2 and the parasitic diode D2 thereof of switch S 3 then form a flywheel gear, for reducing the conduction loss of diode D2, and in Fig. 2, use a bypass capacitor C 1 in order to prolong the replacement time of transformer, and prevent field-effect transistor Q1, closed condition in the time of Q2, and because the existence of transducer stray inductance, so capacitor C 1 will make transducer produce high frequency oscillation, and the problem of aggravation electromagnetic interference (EMI) and increase power loss.
Summary of the invention
The present invention is the shortcoming in view of above-mentioned converter apparatus, and a kind of improved converter apparatus is provided, and it has eliminated the transducer surging, has reduced concussion and electromagnetic interference, and has obtained high efficiency.
According to an aspect of the present invention, provide a kind of transducer that uses circuit of synchronous rectification, this transducer includes a transformer, and secondary coil one end of this transformer is connected with a field-effect transistor, it is characterized in that: this field-effect transistor also is connected with a resistance and an electric capacity of contacting mutually; And an end of the primary coil of this transformer is connected in an end of a main switch, this primary coil and this main switch other end then respectively are serially connected with two diodes, connect an inductance between this two diode, and be connected in the tie point of this primary coil and this main switch by an electric capacity by the link of this inductance and one of them diode, to constitute a LC damping circuit.
Wherein, this transducer can be a forward converter.
Wherein, this transducer can be a flyback transducer.
Wherein, this transducer can be half bridge converter.
Wherein, this transducer can be one and is combined with the transducer of realizing the together living circuit of energy.
Wherein, the transformer of this transducer connects an inductance with secondary coil in addition, and this inductance is connected in series with switch with field-effect transistors, during for this switch open circuit, the energy of issuable abrupt voltage wave is brought back to life in voltage source, thereby protect this switch.
Wherein, the transformer of this transducer has many group outputs.
According to a further aspect in the invention, provide a kind of transducer that uses circuit of synchronous rectification, this transducer includes transformer, and inferior coil one end of this transformer is connected with a field-effect transistor, it is characterized in that this field-effect transistor also is connected with a resistance and an electric capacity of contacting mutually.
Description of drawings
Main feature of the present invention and characteristic thereof, by becoming obvious in conjunction with the accompanying drawings embodiment is described in detail:
Fig. 1 is a kind of circuit diagram that makes the single-ended consequent converter of field-effect transistors synchronous rectifier circuit in the prior art.
Fig. 2 is the another kind of circuit diagram that makes the single-ended consequent converter of field-effect transistors synchronous rectifier circuit in the prior art.
Fig. 3 is the circuit diagram according to the transducer of the LC of being combined with damping circuit of the present invention.
Fig. 4 is the circuit diagram according to the transducer of the RCD of being combined with damping circuit of the present invention.
Fig. 5 is the LC damping circuit in the transducer of the present invention of basis and the load characteristic efficiency curve comparison diagram of RCD damping circuit.
Fig. 6 is the LC damping circuit in the transducer of the present invention of basis and the input characteristics efficiency curve comparison diagram of RCD damping circuit.
Fig. 7 is the waveform schematic diagram according to the transducer of the LC of being combined with damping circuit of the present invention.
Fig. 8 is the operating state waveform schematic diagram according to the transducer of the LC of being combined with damping circuit of the present invention.
Fig. 9 is the circuit diagram according to the transducer of the LC of being combined with damping circuit of the present invention, is used for describing in conjunction with Fig. 7 and Fig. 8 the operating state of this transducer.
Figure 10 is the flyback converter circuit figure according to use synchronous rectifier circuit of the present invention.
Figure 11 is the semibridge system converter circuit figure according to use synchronous rectifier circuit of the present invention.
Figure 12 is equipped with a feedback current to constitute the bring back to life circuit diagram of the forward converter with synchronous rectification of circuit of energy.
Figure 13 is equipped with a feedback current to constitute the bring back to life circuit diagram of the flyback transducer with synchronous rectification of circuit of energy.
Embodiment
As shown in Figure 3, show circuit according to a kind of transducer of the present invention, wherein mainly be in the field effect transistor circuitry in the circuit of synchronous rectification in existing transducer shown in Figure 2 and connect the mutually resistance R 2 and the capacitor C 2 of polyphone, reduce high frequency oscillation to eliminate electromagnetic interference, promote efficient simultaneously; Primary coil at transformer adds the LC damping circuit of being made up of inductance L, capacitor C and diode D3, D4 (Snubber), that is, one end of the primary coil of this transformer is connected in the end of main switch S1, the other end of this primary coil and this main switch respectively is serially connected with diode D3, D4, connect an inductance L between this two diodes D3 and the D4, and be connected in the primary coil of transformer and the contact of main switch S1 with a capacitor C by the link of this inductance L and one of them diode, to constitute a LC damping circuit.The operation of this LC damping circuit is as described below, when main switch S1 open circuit, be present in the energy in magnetic strength and the leakage inductance, will continue guide current by diode D3 and capacitor C, and unlikely generation abrupt voltage wave, capacitor C discharge during this, when main switch S1 conducting, capacitor C and inductance L produce resonance via main switch S1 and diode D4, capacitor C charging during this, therefore transducer is reset, and eliminates surging, and need not to use any auxiliary active switch.
And at main switch S1 open-circuit condition, the passive device energy that is stored in main switch, transducer, connector can form energy and bring back to life.
Fig. 4 is the circuit diagram according to the transducer of the RCD of being combined with damping circuit of the present invention.Wherein be to replace LC damping circuit, and add the RCD damping circuit of forming by resistance R 3, capacitor C 3 and diode D5, in order to protection main switch S1, to prevent surging (turn-off surge) at the primary coil of transformer with difference shown in Figure 3.
As shown in Figure 5, then be the load characteristic efficient comparison diagram that is combined with the transducer of LC damping circuit shown in Figure 3 and is combined with the transducer of RCD damping circuit shown in Figure 4.This two transducer is equipped with the field-effect transistor synchronous rectifier.By finding out among Fig. 5, the forward transformer in the transducer that is combined with LC damping circuit can reach 90.9% maximal efficiency at 4.14 ampere-hours, and this efficient is higher than the transducer that is combined with RCD damping circuit.
As shown in Figure 6, be the efficient comparison diagram that under various different input voltages, is combined with the transducer of LC damping circuit and is combined with the transformer in the transducer of RCD damping circuit.The efficient that is combined with the transformer of LC damping circuit among the figure still is higher than the transformer that is combined with RCD damping circuit, and the discovery that we can be clearly uses LC damping circuit to replace RCD damping circuit, and the efficient of its transformer will improve 10%.
As shown in Figure 7, the waveform according to the transducer of use LC damping circuit of the present invention is shown, abscissa is the time among the figure, each representative voltage of V and I and electric current.Its main waveform static corresponding to a switch periods, above-mentioned should the cycle as shown in Figure 8, include 7 modes of operation, main switch is conducting (ON) in two states, be open circuit (OFF) in 5 states.
As shown in Figure 9, the operation of this transducer is as follows by labor: (1) state 1:
When main switch S1 opened a way, the capacitor C that reduces pressure this moment was discharged with the magnetic current of transducer and output current.Simultaneously, the energy that is stored in the decompression inductance L will be back to voltage source V i, because the polarity of voltage by capacitor C is not anodal, at this state, switch S 2 continues conductings, by transducer secondary current supply load resistance R
0Power supply.(2) state 2:
This state is at induced current i
LArrive startup in 0 o'clock, when capacitor C is discharged to zero, stop.(3) state 3:
Primary current i
N1Continue the capacitor C charging, when energy is transferred to capacitor C fully, primary current i
N1To be 0, at this moment, the voltage V of this capacitor C
CTo be charged to a certain specific voltage.Secondary coil voltage | V
N2| will rise gradually because of the charging action of capacitor C, and during rising thereon, switch S 3 conducting immediately.And the secondary coil voltage that this increases gradually | V
N2|, making diode D2 conducting this moment, this field-effect transistor Q2 of switch S 3 then opens at this moment.(4) state 4:
Diode D3 is at primary current i
N1Arrive 0 o'clock reverse, the voltage V of capacitor C
CThen reply and discharge a little by the diode D3 reverse current of state 4, simultaneously, because of switching voltage V
S1Be higher than voltage source V i, and have current reversal to flow to voltage source V i through primary coil n1.Reply energy whereby, in this stage, energy is replied the reverse reverting of being longer than diode D3 usually.At the latter stage of state 4, primary current i
N1Value is at primary coil voltage V
N1Be 0 and switching voltage V
S1Arrive when equaling voltage source V i.
On the other hand, because switch S 3 is conducting, switching voltage V under this situation
S2The coil voltage V that equals to bear
N2, because of the passive capacitance of capacitor C 2 and switch S 2 can be passed through buck coil current i
N2Charging, this electric current will reduce to 0 in this state latter stage.(5) state 5:
The capacitor C 2 of having charged can be used to prolong the conducting state of field-effect transistor Q2 in the switch S 3, reduces to 0 even transducer is reseted electric current.Therefore the flywheel electric current diode D2 of switch S 3 that do not flow through avoids the bigger secondary voltage back of conducting consume transducer, at primary current i
N1After being 0, will respond to a reverse voltage V
N1D3 charges to capacitor C through diode, makes secondary coil voltage V
N2Reverse voltage rising maintained switch S3 is in conducting state, in primary status, when diode D3 connects switching voltage V
S1Equal capacitor C voltage V
CAnd voltage source V i sum, switching voltage V
S1Keep below 2 times of voltage source V i voltages.(6) state 6:
When main switch S1 conducting, electric current enters primary coil n1 by switch S 1 from voltage source V i, and simultaneously diode D4 will be for along partially, and capacitor C will be discharged voltage V through switch S 1, diode D4
N2Then power and give load resistance R through switch S 2
0At this moment, through one section utmost point after the short time, reverse flywheel current i
S3By switch S 3, this moment, switch S 2 and 3 of switch S presented conducting state simultaneously.(7) state 7:
When switch S 3 internal body diodes D2 reverse reverting electric currents arrive 0, principal current is with maintenance flow through primary coil n1 and switch S 1, and simultaneously, capacitor C will be kept discharge; In primary side, coil voltage V
N2Give load resistance R with continued power
0, capacitor C is done reverse charging by diode D4 and inductance L.
Except that the main embodiment of above-mentioned forward converter with synchronous rectification, but according to transducer of the present invention also as shown in figure 10 the flyback transducer or semibridge system transducer as shown in figure 11.
In embodiment illustrated in fig. 12; be on forward converter shown in Figure 3, to add the circuit of bringing back to life again; other connects one and has the inductance L 1 of secondary coil; the primary coil of this inductance L 1 is connected with switch S 2, S3; when switch S 2 open circuits, the energy of producible abrupt voltage wave is brought back to life in voltage source, thus protection switch S2.
In embodiment illustrated in fig. 13; be on flyback transducer shown in Figure 10, to add the circuit of bringing back to life again; other connects one and has the inductance L 2 of secondary coil; the primary coil of this inductance L 2 is connected with switch S 2; when switch S 2 open circuits, the energy of producible abrupt voltage wave is brought back to life in voltage source, thus protection switch S2.
Above illustrated embodiment is only used the present invention for convenience of description, does not break away from the present invention spirit category, those skilled in the art various simple and easy distortion and the modification that can do, all must include in appended claim institute restricted portion.
Claims (8)
1, a kind of transducer that uses circuit of synchronous rectification, this transducer includes a transformer, and secondary coil one end of this transformer is connected with a field-effect transistor, it is characterized in that:
This field-effect transistor also is connected with a resistance and an electric capacity of contacting mutually; And
One end of the primary coil of this transformer is connected in an end of a main switch, this primary coil and this main switch other end then respectively are serially connected with two diodes, connect an inductance between this two diode, and be connected in the tie point of this primary coil and this main switch by an electric capacity by the link of this inductance and one of them diode, to constitute a LC damping circuit.
According to the transducer of the described use circuit of synchronous rectification of claim 1, it is characterized in that 2, this transducer is a forward converter.
According to the transducer of the described use circuit of synchronous rectification of claim 1, it is characterized in that 3, this transducer is a flyback transducer.
According to the transducer of the described use circuit of synchronous rectification of claim 1, it is characterized in that 4, this transducer is half bridge converter.
According to the transducer of the described use circuit of synchronous rectification of claim 1, it is characterized in that 5, this transducer is one to be combined with and to realize that energy is with the transducer of giving birth to circuit.
6, according to the transducer of the described use circuit of synchronous rectification of claim 5; it is characterized in that; the transformer of this transducer connects an inductance with secondary coil in addition; this inductance is connected in series with switch with field-effect transistors; during for this switch open circuit; the energy of issuable abrupt voltage wave is brought back to life in voltage source, thereby protect this switch.
According to the transducer of any one described use circuit of synchronous rectification in the claim 1 to 5, it is characterized in that 7, the transformer of this transducer has many group outputs.
8, a kind of transducer that uses circuit of synchronous rectification, this transducer includes transformer, and inferior coil one end of this transformer is connected with a field-effect transistor, it is characterized in that, and this field-effect transistor also is connected with a resistance and an electric capacity of contacting mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021060703A CN1238957C (en) | 2002-04-11 | 2002-04-11 | Converter using synchronous rectifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021060703A CN1238957C (en) | 2002-04-11 | 2002-04-11 | Converter using synchronous rectifier circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1450714A true CN1450714A (en) | 2003-10-22 |
| CN1238957C CN1238957C (en) | 2006-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021060703A Expired - Fee Related CN1238957C (en) | 2002-04-11 | 2002-04-11 | Converter using synchronous rectifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1238957C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1972097B (en) * | 2005-11-21 | 2011-07-06 | 凌骥电子(上海)有限公司 | Soft transition controller, method for control of soft transition and synchronous converter using the same |
| CN105556843A (en) * | 2013-09-20 | 2016-05-04 | 欧司朗有限公司 | Synchronous rectifier |
| CN109873557A (en) * | 2017-12-01 | 2019-06-11 | 康舒科技股份有限公司 | Power adapter with low-loss damper |
| TWI732581B (en) * | 2020-06-03 | 2021-07-01 | 亞源科技股份有限公司 | Conversion device with oscillation reduction control and method of operation of oscillation reduction control the same |
-
2002
- 2002-04-11 CN CNB021060703A patent/CN1238957C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1972097B (en) * | 2005-11-21 | 2011-07-06 | 凌骥电子(上海)有限公司 | Soft transition controller, method for control of soft transition and synchronous converter using the same |
| CN105556843A (en) * | 2013-09-20 | 2016-05-04 | 欧司朗有限公司 | Synchronous rectifier |
| CN105556843B (en) * | 2013-09-20 | 2019-05-17 | 欧司朗有限公司 | Synchronous rectifier |
| CN109873557A (en) * | 2017-12-01 | 2019-06-11 | 康舒科技股份有限公司 | Power adapter with low-loss damper |
| CN109873557B (en) * | 2017-12-01 | 2020-11-03 | 康舒科技股份有限公司 | Power converter with low loss vibration reducer |
| TWI732581B (en) * | 2020-06-03 | 2021-07-01 | 亞源科技股份有限公司 | Conversion device with oscillation reduction control and method of operation of oscillation reduction control the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1238957C (en) | 2006-01-25 |
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