CN1667927A - Asymmetric half-bridge flyback converter - Google Patents
Asymmetric half-bridge flyback converter Download PDFInfo
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- CN1667927A CN1667927A CN 200410006496 CN200410006496A CN1667927A CN 1667927 A CN1667927 A CN 1667927A CN 200410006496 CN200410006496 CN 200410006496 CN 200410006496 A CN200410006496 A CN 200410006496A CN 1667927 A CN1667927 A CN 1667927A
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- transformer
- switch element
- control circuit
- parasitic capacitance
- flyback converter
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Abstract
This invented returned converter means to use multiple transformers in series and parallel, which reduces switch noises and loss and increases the efficiency of an integral converter and is more suitable for the low profile system. Zero switch of the voltage is realized easily with the help of an additional resonant inductor and the additional saturated inductance can effectively reduce EMI.
Description
Technical field
The present invention relates to have the circuit framework of the asymmetrical half-bridge direction flyback converter of multiple transformer synchronous rectification controlled function, aim to provide a direction flyback converter circuit that can be used to reach high efficiency and slimming purpose.
Background technology
Press, so-called semibridge system transducer (Half-bridge) is one to convert direct voltage a kind of power source conversion framework of different direct voltages to, it mainly is by two switch electric crystals (following general designation switch element) ON-OFF action repeatedly in turn, and reaches the purpose of adjusting voltage output.
Again, the power supply supply of general computer system, stable and the abundance of its power supply are necessary; Yet, because in the middle of same power system, the loss of its power supply also may occur in the power consumption of transformer, and being the power that is consumed, the high temperature that its transformer produced is transformed, therefore in the system of slimming (Low-Profile), how to reduce the power consumption of transformer, will be considered as another important problem.
Moreover known direction flyback converter circuit framework can be because the charge storage asynchronism(-nization) of two switch elements may produce bias phenomenon, and the reliability of switch element (Switching transistor) also can reduce when high temperature operates when actual operation.
Summary of the invention
The present invention relates to have the circuit framework of the asymmetrical half-bridge direction flyback converter of multiple transformer synchronous rectification controlled function, aim to provide a direction flyback converter circuit that can be used to reach high efficiency and slimming purpose.
For this reason, the technical scheme of the present invention's proposition is:
A kind of asymmetrical half-bridge direction flyback converter, it is to be provided with main switch element and auxiliary switch element between the circuit of the transformer input primary side of a plurality of connection in series-parallel stacks and the connection of control circuit formation, the first side winding of each transformer constitutes series system, the secondary side Transformer Winding of each transformer constitutes in parallel, be equipped with first parasitic diode and first parasitic capacitance between two contacts of this main switch element, be equipped with second parasitic diode and second parasitic capacitance between two contacts of this auxiliary switch element; In addition, between two transformers and control circuit, add a resonant inductance and and intercept electric capacity; Switching by master/auxiliary switch element comes the action of control circuit, make each transformer have synchronous rectification, and utilize resonant inductance to reach the resonance function, with leakage inductance and first parasitic capacitance and second parasitic capacitance that makes two transformers, produce resonance during blind between switch, to reach the zero voltage switching of main switch element and auxiliary switch element respectively.
A kind of asymmetrical half-bridge direction flyback converter, it is to be provided with main switch element and auxiliary switch element between the circuit of the transformer input primary side of a plurality of connection in series-parallel stacks and the connection of control circuit formation, the first side winding of each transformer constitutes series system, the secondary side Transformer Winding of each transformer constitutes in parallel, be equipped with first parasitic diode and first parasitic capacitance between two contacts of this main switch element, be equipped with second parasitic diode and second parasitic capacitance between two contacts of this auxiliary switch element; In addition, the primary side that connects in two transformers and control circuit adds one and intercepts electric capacity, and adds a resonant inductance respectively at the secondary side of each transformer; Switching by master/auxiliary switch element comes the action of control circuit, make each transformer have synchronous rectification, and utilize resonant inductance to reach the resonance function, with leakage inductance and first parasitic capacitance and second parasitic capacitance that makes two transformers, produce resonance during blind between switch, to reach the zero voltage switching of main switch element and auxiliary switch element respectively.
Wherein: the transformer output secondary side that each stack is used is to add first rectifier diode and second rectifier diode by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed.
The output secondary side of the transformer that each stack is used is to add first synchronous rectification switch and second rectifier switch by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed.
The transformer output secondary side that each stack is used is to add first rectifier diode and second rectifier diode by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed; This current rectifying and wave filtering circuit is made up of first filter capacitor, second filter capacitor and filter inductance.
The transformer output secondary side that each stack is used is to add first synchronous rectification switch and second rectifier switch by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed; This current rectifying and wave filtering circuit is made up of first filter capacitor, second filter capacitor and filter inductance.
This control circuit is to be achieved by pulse-width modulation PWM control circuit and Drive and Control Circuit.
This main switch element wherein path place of a contact is provided with first pulsactor, and this auxiliary switch element wherein path place of a contact is provided with second pulsactor.
Asymmetrical half-bridge direction flyback converter of the present invention, be a kind of high-efficiency power change-over circuit framework that the multiple transformer connection in series-parallel can be used, it mainly is the action that comes control circuit by the switching of switch element, make each transformer have the function of synchronous rectification, and utilize electric current the discharging and recharging of resonant inductance to the switch parasitic capacitance, can reach the no-voltage conducting of switch, its switch cost can be reduced.
Whereby, when using the transformer that (contains two) more than two, this magnetic element can be given slimming, and the power appropriateness that it consumed is dispersed on two transformers, be unlikely and cause the overheated problem of transformer to produce.
Description of drawings
Fig. 1 is the circuit arrangement configuration diagram of first embodiment of the invention;
Fig. 2 is the circuit operating state schematic diagram during main switch element Q1 conducting in the first embodiment of the invention;
Fig. 3 is the circuit operating state schematic diagram during auxiliary switch element Q2 conducting in the first embodiment of the invention;
Fig. 4 is the circuit arrangement configuration diagram of second embodiment of the invention;
Fig. 5 is the circuit arrangement configuration diagram of third embodiment of the invention;
Fig. 6 is the circuit arrangement configuration diagram of fourth embodiment of the invention;
Fig. 7 is the circuit arrangement configuration diagram of fifth embodiment of the invention;
Fig. 8 is the circuit arrangement configuration diagram of sixth embodiment of the invention;
Fig. 9 is the circuit arrangement configuration diagram of seventh embodiment of the invention;
Figure 10 is the circuit arrangement configuration diagram of eighth embodiment of the invention;
Figure 11 is the circuit arrangement configuration diagram of ninth embodiment of the invention.
[figure number explanation]
C1, first parasitic capacitance
C2, second parasitic capacitance
C3, obstruct electric capacity
C4, first filter capacitor
C5, second filter capacitor
D1, first parasitic diode
D2, second parasitic diode
D3, first rectifier diode
D4, second rectifier diode
IC1, pwm control circuit
IC2, Drive and Control Circuit
L1, first pulsactor
L2, second pulsactor
L3, resonant inductance
L4, filter inductance
Q1, main switch element
Q2, auxiliary switch element
Q3, first synchronous rectification switch
Q4, second synchronous rectification switch
Qn, appended synchronization rectifier switch
T1, first transformer
T2, second transformer
Tn, adapter transformer
10, control circuit
20, current rectifying and wave filtering circuit
Embodiment
For the clear structure of the present invention of your auditor is formed, and the overall operation mode, cooperate graphic being described as follows now:
Asymmetrical half-bridge direction flyback converter of the present invention, it is the high-efficiency power change-over circuit framework that the multiple transformer connection in series-parallel can be used for a kind of, it mainly is the action that comes control circuit by the switching of switch element, make each transformer have the function of synchronous rectification, and utilize electric current the discharging and recharging of resonant inductance to the switch parasitic capacitance, can reach the no-voltage conducting of switch, its switch cost can be reduced.
At first, as shown in Figure 1, be circuit arrangement mode figure (using with two transformer stacks is basic enforcement state) for asymmetrical half-bridge direction flyback converter circuit framework first embodiment of the present invention, the entire circuit framework is first, second transformer T1, the T2 with connection in series-parallel stack, first side winding at this first, second transformer T1, T2 is to be series system, the secondary side Transformer Winding of first, second transformer T1, T2 is a parallel way then, and its power can be shared out equally thereon.
Wherein, first, the second transformer T1, be provided with main switch element Q1 and auxiliary switch element Q2 between the circuit that the input primary side of T2 and control circuit 10 formations connect, be equipped with the first parasitic diode D1 and the first parasitic capacitance C1 between two contacts of main switch element Q1, be equipped with the second parasitic diode D2 and the second parasitic capacitance C2 between two contacts of its auxiliary switch element Q2, and wherein be provided with the first pulsactor L1 and the second pulsactor L2 in the path place of a contact at main switch element Q1 and auxiliary switch element Q2 respectively, the control circuit 10 of its first transformer T1 and the second transformer T2 then is to be achieved by pwm control circuit IC1 and Drive and Control Circuit IC2; In addition, between first, second transformer T1, T2 and control circuit 10, add a resonant inductance L3 and and intercept capacitor C 3.
Make by resonant inductance L3 in order to reach the resonance function, with leakage inductance and the first parasitic capacitance C1, the second parasitic capacitance C2 that makes first, second transformer T1, T2, (dead time) produces resonance during blind between switch, to reach the zero voltage switching of main switch element Q1 and auxiliary switch element Q2 respectively; Certainly, its resonant inductance L3 can also be provided in the secondary side of each transformer (being first, second transformer T1, T2 in graphic) as shown in figure 11, also can reach identical effect.Again, intercept capacitor C 3 (blocking capacitor), because its value is enough big, the voltage of striding thereon can be considered definite value.
As for, the output secondary side of first, second transformer T1, T2 then is that the secondary winding by first, second transformer T1, T2 adds the rectification diode (being distinguished with the first rectification diode D3 and the second rectification diode D4 in graphic) that cooperates first, second transformer T1, T2 to be added, and is reached by the current rectifying and wave filtering circuit 20 that the first filter capacitor C4, second filter capacitor C5 and the filter inductance L4 are formed; Again, the output secondary side of first, second transformer T1, T2 cooperates first, second transformer T1, rectifier diode that T2 adds, can also be substituted by synchronous rectification switch (being distinguished) as shown in Figure 5 with the first synchronous rectification switch Q3 and the second synchronous rectification switch Q4.
In this circuit framework shown in Figure 1, the work period (duty cycle) of main switch element Q1 and auxiliary switch element Q2 is inequality, and is complementary situation, therefore is referred to as asymmetrical framework.
Owing to be that the mode of first, second transformer T1, T2 connection in series-parallel stack is used, and this magnetic element can be given slimming, and the power that it consumed can appropriateness be dispersed on two transformers, be unlikely and cause the overheated problem of transformer to produce; Especially, the first transformer T1 and the second transformer T2 play the part of the role of the transformer and the energy storage inductor of normal operation respectively simultaneously at different cycles, when main switch element Q1 conducting, each transformer (first, second transformer T1, T2 in graphic) all is considered as energy storage inductor and is recharged; Otherwise when auxiliary switch element Q2 conducting, each transformer (first, second transformer T1, T2 in graphic) all is considered as transformer and transfers the energy to secondary side, to the output loading end.
Moreover further the mechanism description to its operation principle of circuit framework of (first embodiment) shown in Figure 1 and no-voltage conducting is as follows:
As shown in Figure 2, when main switch element Q1 conducting and auxiliary switch element Q2 by the time, electric current is to be flowed into by input supply terminal Vin to intercept capacitor C 3, the first side winding of the first transformer T1 and the second transformer T2, the resonant inductance L3 that adds, and the main switch element Q1 and the first pulsactor L1, this moment, energy was to be stored in the first side winding by the first transformer T1 and the second transformer T2, in each Circuit Fault on Secondary Transformer winding because polar relationship, the first rectifier diode D3 and the second rectifier diode D4 are in the reverse bias not on-state, and the energy of output loading end is then continued to provide by output capacitance.This moment, the first transformer T1 and the second transformer T2 just can store energy in the winding as the effect of inductance.
And then if when main switch Q1 is cut off, the electric current of main switch element Q1 of then flowing through originally can be respectively discharges and recharges the first parasitic capacitance C1 and the second parasitic capacitance C2 of main switch element Q1 and auxiliary switch element Q2 and (the first parasitic capacitance C1 is charged, and to second parasitic capacitance C2 discharge), this moment, the cross-pressure of the drawing of main switch element Q1-source electrode two ends began to rise with the form of resonance, when main switch element Q1 draw-after the cross-pressure at source electrode two ends rises to input voltage, can make the second parasitic diode D2 of auxiliary switch element Q2 forward lead, so can make auxiliary switch element Q2 draw-the cross-pressure strangulation at source electrode two ends is in no-voltage.If the resonance current of this primary side is before oppositely, before just the second parasitic diode D2 of auxiliary switch element Q2 ends, the control signal of Drive and Control Circuit IC2 can be led auxiliary switch element Q2, can reach the no-voltage conducting of auxiliary switch element Q2.
So, when auxiliary switch element Q2 led and main switch element Q1 by the time, as shown in Figure 3, be stored in the energy that intercepts capacitor C 3 and can be sent to secondary side winding by the first transformer T1 and the second transformer T2, and via the first rectification diode D3, the second rectifier diode D4, and current rectifying and wave filtering circuit 20 is sent to the output loading end.
Same, and then if when auxiliary switch element Q2 is cut off, then flow through the electric current of auxiliary switch element Q2 can be respectively to the first parasitic capacitance C1 of main switch element Q1 and auxiliary switch element Q2, the second parasitic capacitance C2 discharges and recharges (to the parasitic C1 discharge of first electric capacity, and to second parasitic capacitance C2 charging), this moment, the cross-pressure of the drawing of main switch element Q1-source electrode two ends began to descend with the form of resonance, when main switch element Q1 draw-after the cross-pressure at source electrode two ends drops to no-voltage, can make the first forward conducting of parasitic diode D1 of main switch element Q1, so can make main switch element Q1 draw-the cross-pressure strangulation at source electrode two ends is in no-voltage.If the resonance current of this primary side is before oppositely, before just the first parasitic diode D1 of main switch element Q1 ends, the control signal of Drive and Control Circuit IC2 can give conducting with main switch element Q1, can reach the no-voltage conducting of main switch element Q1.
Can be expressed as follows as for the relation of the voltage transitions between output voltage and the input voltage:
Vo/Vin＝[D]/[(Np1/Ns1)+(NP2/Ns2)]；
Represent work period (Duty Cycle) of main switch at this D, Np1/Ns1 is the primary side and secondary side number of turns ratio of the first transformer T1, and Np2/Ns2 is the primary side and secondary side number of turns ratio of the second transformer T2.
Moreover, as shown in Figure 4, when the employed transformer of circuit framework of the present invention be when using with the multiple connection in series-parallel of plural transformer stack (shown in graphic, the configuration quantity of transformer is by T1, when T2 increases to n adapter transformer Tn), it only needs to cooperate additional transformer Tn quantity out of the ordinary to add the additional rectifier diode Dn of equal number at the secondary side of each transformer, so that the use of bigger demand or slimming demand to be arranged when power output, or as shown in Figure 6, secondary side can be exported rectifier diode and change an effect electric crystal (MOSFET) into and can make all transformers have the function of synchronous rectification, to reach the purpose of raising the efficiency.
Certainly, circuit framework of the present invention can also be as Fig. 7 to shown in Figure 8, main switch element 01 is moved to bridge by following bridge, and auxiliary switch element Q2 is moved to down bridge by last bridge, and its relevant operating principle is identical with the circuit framework of previous embodiment, and has the function of multiple transformer synchronous rectification equally.
As mentioned above, the invention provides an asymmetrical half-bridge direction flyback converter circuit framework that can reach high efficiency and slimming purpose, so offer the application of patent of invention in accordance with the law; Yet, above implementation and graphic shown in, be one of preferred embodiment of the present invention, be not to limit to the present invention with this, be with, approximate with structure of the present invention, device, feature etc. such as or identical mutually person all should belong to of the present invention founding within purpose and the claim.
Claims (8)
1, a kind of asymmetrical half-bridge direction flyback converter, it is characterized in that: be between the transformer input primary side of a plurality of connection in series-parallel stack and control circuit constitute the circuit of connection, to be provided with main switch element and auxiliary switch element, the first side winding of each transformer constitutes series system, the secondary side Transformer Winding of each transformer constitutes in parallel, be equipped with first parasitic diode and first parasitic capacitance between two contacts of this main switch element, be equipped with second parasitic diode and second parasitic capacitance between two contacts of this auxiliary switch element; In addition, between two transformers and control circuit, add a resonant inductance and and intercept electric capacity; Switching by master/auxiliary switch element comes the action of control circuit, make each transformer have synchronous rectification, and utilize resonant inductance to reach the resonance function, with leakage inductance and first parasitic capacitance and second parasitic capacitance that makes two transformers, produce resonance during blind between switch, to reach the zero voltage switching of main switch element and auxiliary switch element respectively.
2, a kind of asymmetrical half-bridge direction flyback converter, it is characterized in that: be between the transformer input primary side of a plurality of connection in series-parallel stack and control circuit constitute the circuit of connection, to be provided with main switch element and auxiliary switch element, the first side winding of each transformer constitutes series system, the secondary side Transformer Winding of each transformer constitutes in parallel, be equipped with first parasitic diode and first parasitic capacitance between two contacts of this main switch element, be equipped with second parasitic diode and second parasitic capacitance between two contacts of this auxiliary switch element; In addition, the primary side that connects in two transformers and control circuit adds one and intercepts electric capacity, and adds a resonant inductance respectively at the secondary side of each transformer; Switching by master/auxiliary switch element comes the action of control circuit, make each transformer have synchronous rectification, and utilize resonant inductance to reach the resonance function, with leakage inductance and first parasitic capacitance and second parasitic capacitance that makes two transformers, produce resonance during blind between switch, to reach the zero voltage switching of main switch element and auxiliary switch element respectively.
3, asymmetrical half-bridge direction flyback converter as claimed in claim 1 or 2, it is characterized in that: the transformer output secondary side that each stack is used is to add first rectifier diode and second rectifier diode by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed.
4, asymmetrical half-bridge direction flyback converter as claimed in claim 1 or 2, it is characterized in that: the output secondary side of the transformer that each stack is used is to add first synchronous rectification switch and second rectifier switch by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed.
5, asymmetrical half-bridge direction flyback converter as claimed in claim 1 or 2, it is characterized in that: the transformer output secondary side that each stack is used is to add first rectifier diode and second rectifier diode by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed; This current rectifying and wave filtering circuit is made up of first filter capacitor, second filter capacitor and filter inductance.
6, asymmetrical half-bridge direction flyback converter as claimed in claim 1 or 2, it is characterized in that: the transformer output secondary side that each stack is used is to add first synchronous rectification switch and second rectifier switch by each Secondary winding of transformer, and current rectifying and wave filtering circuit is formed; This current rectifying and wave filtering circuit is made up of first filter capacitor, second filter capacitor and filter inductance.
7, asymmetrical half-bridge direction flyback converter as claimed in claim 1 or 2 is characterized in that: this control circuit is to be achieved by pulse-width modulation PWM control circuit and Drive and Control Circuit.
8, asymmetrical half-bridge direction flyback converter as claimed in claim 1 or 2 is characterized in that: this main switch element wherein path place of a contact is provided with first pulsactor, and this auxiliary switch element wherein path place of a contact is provided with second pulsactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410006496 CN1667927A (en) | 2004-03-10 | 2004-03-10 | Asymmetric half-bridge flyback converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410006496 CN1667927A (en) | 2004-03-10 | 2004-03-10 | Asymmetric half-bridge flyback converter |
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| CN1667927A true CN1667927A (en) | 2005-09-14 |
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| CN 200410006496 Pending CN1667927A (en) | 2004-03-10 | 2004-03-10 | Asymmetric half-bridge flyback converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100521483C (en) * | 2006-07-07 | 2009-07-29 | 艾默生网络能源有限公司 | Active clamped topology circuit of multi transformer |
| CN102545635A (en) * | 2012-02-09 | 2012-07-04 | 杭州电子科技大学 | Bridgeless fly-back converter with high power factor |
| CN106877668A (en) * | 2015-12-11 | 2017-06-20 | 中国航空工业集团公司雷华电子技术研究所 | A kind of asymmetrical half-bridge converter topological structure |
| CN107707100A (en) * | 2016-08-08 | 2018-02-16 | 现代自动车株式会社 | Overall magnetic devices and the DC to DC converter including the device |
-
2004
- 2004-03-10 CN CN 200410006496 patent/CN1667927A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100521483C (en) * | 2006-07-07 | 2009-07-29 | 艾默生网络能源有限公司 | Active clamped topology circuit of multi transformer |
| CN102545635A (en) * | 2012-02-09 | 2012-07-04 | 杭州电子科技大学 | Bridgeless fly-back converter with high power factor |
| CN102545635B (en) * | 2012-02-09 | 2014-01-29 | 杭州电子科技大学 | Bridgeless fly-back converter with high power factor |
| CN106877668A (en) * | 2015-12-11 | 2017-06-20 | 中国航空工业集团公司雷华电子技术研究所 | A kind of asymmetrical half-bridge converter topological structure |
| CN107707100A (en) * | 2016-08-08 | 2018-02-16 | 现代自动车株式会社 | Overall magnetic devices and the DC to DC converter including the device |
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