CN101355304B - Circuit for reusing leakage inductance energy and flyback converter containing the circuit - Google Patents
Circuit for reusing leakage inductance energy and flyback converter containing the circuit Download PDFInfo
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- CN101355304B CN101355304B CN2007101232858A CN200710123285A CN101355304B CN 101355304 B CN101355304 B CN 101355304B CN 2007101232858 A CN2007101232858 A CN 2007101232858A CN 200710123285 A CN200710123285 A CN 200710123285A CN 101355304 B CN101355304 B CN 101355304B
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Abstract
The present invention discloses a leakage inductance energy reusing circuit and a flyback transducer with the same. The flyback transducer comprises a transformer and the leakage inductance energy reusing circuit. The leakage inductance energy reusing circuit comprises a clamp circuit, an energy storage circuit and a switch which is connected between the clamp circuit and the energy storage circuit, wherein a primary side winding of the transformer is electrically connected to a power switch. The clamp circuit is used for clamping the voltage of the power switch to a predetermined voltage. The energy storage circuit is used for storing the leakage inductance energy of the primary side winding. When the switch is turned on, the clamp circuit receives and stores the leakage inductance energy of the primary side winding of the transformer, and clamps the voltage of the power switch to be the predetermined voltage. When the switch is turned on, the energy stored in the clamp circuit is stored in the energy storage circuit via the switch.
Description
Technical field
The present invention relates to a kind of flyback converter, relate in particular to a kind of flyback converter that leakage inductance (leakage-inductance) energy utilizes circuit again that has.
Background technology
Figure 1 shows that existing flyback converter (flyback converter) 100, DC input voitage Vin is coupled to the first side winding Lp of transformer TX, and power switch Q1 connects with the first side winding Lp of transformer TX, and power switch Q1 is a MOS.Controller 102 output one pulse-width modulation signal is with conducting or the not conducting of power switched switch Q1, conducting by power switch Q1 or not conducting with the conversion input voltage vin to the secondary side winding Ls of transformer TX to produce output voltage V o.Sensing resistor R2 connects with the first side winding Lp of transformer TX, in order to detect first side winding electric current I p.
When power switch Q1 is subjected to the control of pulse-width modulation signal and transfers not conducting (Off) to by conducting (On), the voltage Vd of power switch Q1 drain electrode as shown in Figure 2, moment in not conducting of power switch Q1 will produce instantaneous pressure, be attended by ripple and produce, may cause power switch Q1 collapse and damage.In order to solve such problem, can one clamp (clamp) circuit be set at the first side winding Lp of transformer Tx usually.
Clamp circuit 104 is electrically connected at the first side winding Lp of transformer TX, include first resistance R 1 and first capacitor C 1 is in parallel, first resistance R 1 is connected with first end of the first side winding Lp of transformer TX with first end of first capacitor C 1, the negative electrode of the first diode D1 is connected with second end of first resistance R 1 with first capacitor C 1, and the anode of the first diode D1 is connected with second end of first side winding Lp.
When power switch Q1 is subjected to the control of pulse-width modulation signal and transfers not conducting (Off) to by conducting (On), be stored in the leakage inductance L of the first side winding Lp of transformer TX
LKEnergy 1/2L
LKI
P 2Can be earlier to the charging of the parasitic capacitance Cds between the drain-source of power switch Q1, when treating that drain voltage Vd rises to the voltage Vc1 at first capacitor C, 1 two ends and DC input voitage Vin sum, the first diode D1 conducting, this moment the leakage inductance electric current I
LLKTo 1 charging of first capacitor C, thus, the drain voltage Vd of power switch Q1 will be clamped at Vc1+Vin by clamp circuit, damage to prevent power switch Q1 collapse by the first diode D1.Next the first diode D1 transfers not conducting to because of natural resonance, leakage inductance L
LKEnter resonance with the stray capacitance of circuit, energy stored in first capacitor C 1 is by 1 discharge of first resistance R, so these energy will consume in the mode of heat.
Power switch Q1 is subjected to the control of pulse-width modulation signal and conducting and not conducting periodically, and therefore above-mentioned charge and discharge process also is to repeat periodically.Owing to will dissipating in the mode of heat after the energy discharge stored in first capacitor C 1, therefore will have the inside that unnecessary heat energy accumulates on flyback converter, and stored energy slatterns virtually also in first capacitor C 1.
Summary of the invention
Technical problem to be solved by this invention is to provide circuit that a kind of leakage inductance energy utilizes again and a kind of flyback converter with circuit that leakage inductance energy utilizes again, it is in the not conducting moment of power switch, the energy of transformer leakage inductance will be stored in, convert available energy to by switch and conversion line, with the feed-in accessory power supply or be supplied to other circuit to use, with the operating voltage that reaches clamp power switch simultaneously and transfer the invalid energy to the effective energy and use, to promote the conversion efficiency of flyback converter.
For achieving the above object, the circuit that leakage inductance energy disclosed in this invention utilizes again, be applied to a flyback converter, the circuit that this leakage inductance energy utilizes again includes a clamp circuit, an energy storage circuit and a switch, wherein this first side winding of a clamp circuit and a transformer electrically connects, in order to the cross-pressure of power-limiting switch in a predetermined voltage; Switch is electrically connected between clamp circuit and the energy storage circuit, wherein when not conducting of switch, clamp circuit receives and stores the leakage inductance energy of the first side winding of transformer, and when switch conduction, the energy that is stored in the clamp circuit is discharged in the energy storage circuit via switch.
And, for achieving the above object, the invention provides a kind of flyback converter with circuit that leakage inductance energy utilizes again, described flyback converter includes a transformer, a clamp circuit, an energy storage circuit and and is connected in the switch between clamp circuit and the energy storage circuit.Transformer wherein, have a first side winding and a secondary side winding, wherein the first side winding of transformer is electrically connected with a power switch, power switch is subjected to a controller and controls, conducting that controller is exported a pulse-width modulation signal controlling power switch and not conducting, conducting by power switch or not conducting are so that flyback converter is changed a direct current input voltage is a direct current output voltage.The first side winding of clamp circuit and transformer electrically connects, in order to the cross-pressure of power-limiting switch in a predetermined voltage.Energy storage circuit is in order to store the leakage inductance energy of first side winding.Switch is electrically connected between clamp circuit and the energy storage circuit, wherein when not conducting of switch, clamp circuit receives and stores the leakage inductance energy of the first side winding of transformer, with voltage clamp to a predetermined voltage with power switch, when switch conduction, the energy that is stored in the clamp circuit is discharged in the energy storage circuit via switch.
Adopt the present invention, the first side winding Lp leakage inductance energy of transformer TX can store by energy storage circuit, and with the conversion efficiency of raising flyback converter, and the heat of minimizing flyback converter inside is to reduce temperature rise.On the other hand, the disclosed embodiment of the present invention can cooperate circuit design with stored energy integration in integrated circuit, to save outside accessory power supply.
More than about the explanation of the explanation of content of the present invention and following execution mode in order to demonstration with explain spirit of the present invention and principle, and provide claim of the present invention further to explain.According to the disclosed content of this specification, claim and accompanying drawing, those skilled in the art can understand purpose and the advantage that the present invention is correlated with easily.
Description of drawings
Fig. 1 is the disclosed flyback converter of prior art;
Fig. 2 is the drain voltage of not conducting of the power switch moment in the disclosed flyback converter of prior art;
Fig. 3 is first embodiment of the disclosed flyback converter of the present invention;
Fig. 4 is second embodiment of the disclosed flyback converter of the present invention;
Fig. 5 is second embodiment of the disclosed flyback converter of the present invention.
Wherein, Reference numeral:
100: flyback converter 102: controller
104: clamp circuit 200: flyback converter
202: controller 204: clamp circuit
206: energy storage circuit 208: energy storage circuit
210: energy storage circuit Vin: DC input voitage
TX: transformer Lp: first side winding
Ls: secondary side winding Q1: power switch
R1: first resistance R 2: sensing resistor
C1: 2: the second electric capacity of first capacitor C
Vo: output voltage Ip: first side winding electric current
D1: the first diode D2: second diode
D3: the 3rd diode D4: the 4th diode
Cds: parasitic capacitance Vd: drain voltage
Vc1: voltage SW: switch
N1: the first end N2: second end
L1: the first inductance CS: current source
LLK: leakage inductance
Embodiment
Below in execution mode, be described in detail detailed features of the present invention and advantage, its content is enough to make those skilled in the art to understand technology contents of the present invention and implements according to this, wherein said embodiment further describes the present invention, but non-to limit category of the present invention anyways.
Please refer to Fig. 3, be first embodiment of the disclosed flyback converter of the present invention.Flyback converter (flyback converter) 200 includes a transformer Tx, a clamp circuit 204, an energy storage circuit 206 and a switch SW.Clamp circuit 204 is electrically connected at the first side winding Lp of transformer TX.One end of switch SW is electrically connected at clamp circuit 204, and the other end is electrically connected at energy storage circuit 206.
Switch SW is subjected to the control of pulse-width modulation signal and conducting and not conducting periodically.In one embodiment, switch SW can be identical with the switch periods of power switch Q1, also is switch SW and synchronous conducting of power switch Q1 or not conducting.In another embodiment, switch SW is early than power switch Q1 and conducting or not conducting.In one embodiment, the pulse-width modulation signal can be by controller 202 outputs.
Include the first diode D1, the second diode D2, the 3rd diode D3 and first capacitor C 1 in the clamp circuit 204.The first diode D1, first capacitor C 1 are connected mutually with the second diode D2, and wherein first capacitor C 1 is electrically connected between the first diode D1 and the second diode D2.The negative electrode of the first diode D1 is electrically connected to the first end N1 of first side winding Lp, and the anode of the second diode D2 is electrically connected to the second end N2 of first side winding Lp.The negative electrode of the 3rd diode D3 is electrically connected between the anode and first capacitor C 1 of the first diode D1, and the anode of the 3rd diode D3 is electrically connected to earth terminal.
In one embodiment, flyback converter 200 includes a controller 202 and a power switch Q1 in addition, and power switch Q1 connects with the first side winding Lp of transformer TX.Controller 202 is in order to export conducting or the not conducting of a pulse-width modulation signal with power switched switch Q1.DC input voitage Vin is coupled to the first side winding Lp of transformer TX, and conducting by power switch Q1 or not conducting produce output voltage V o with conversion DC input voitage Vi to the secondary side winding Ls of transformer TX.Sensing resistor R2 connects with the first side winding Lp of transformer TX, in order to detect first side winding electric current I p.
When power switch Q1 transfers not conducting to by conducting, the synchronous or specific power switch Q1 not conducting earlier of switch SW and power switch Q1.This moment, the 3rd diode D3 also was a not on-state.The leakage inductance energy that is stored in transformer Tx first side winding Lp charges to first capacitor C 1 via the second diode D2, first capacitor C 1 and formed first charge path of the first diode D1.When leakage inductance energy was stored to first capacitor C 1, the Vd of power switch Q1 also was clamped at the voltage Vc1 and the DC input voitage Vin sum at first capacitor C, 1 two ends, also is Vin+Vc1.
When power switch Q1 transferred conducting to by not conducting, this moment, the first diode D1 and the second diode D2 became not on-state.Synchronous or the specific power switch Q1 conducting earlier of switch SW and power switch Q1, this moment, the 3rd diode D3 also was in conducting state, therefore the energy that stores first capacitor C 1 can be via first resistance R, 1 formed second charge path to 2 chargings of second capacitor C, so that energy is transferred to second capacitor C 2 by first capacitor C 1.The energy that is converted to second capacitor C 2 can be used as the burden that accessory power supply used or shared auxiliary power.Thus, the leakage inductance energy of transformer Tx first side winding Lp just can not scatter and disappear and is stored in second capacitor C 2 with the form of heat energy.
Please refer to Fig. 4, be second embodiment of the disclosed flyback converter of the present invention, illustrate another embodiment of energy storage circuit 208 among the figure.Energy storage circuit 208 as shown in the figure includes first inductance L 1, second capacitor C 2 and the 4th diode D4 and forms.First inductance L 1 is connected with second capacitor C 2, and the other end of the negative electrode of the 4th diode D4 and first inductance L 1 electrically connects, and the other end of the anode of the 4th diode D4 and second capacitor C 2 electrically connects.When power switch Q1 transfers conducting to by not conducting, this moment, the first diode D1 and the second diode D2 became not on-state, this moment, the 3rd diode D3 also was in conducting state, therefore the energy that is stored in first capacitor C 1 can be via first inductance L, 1 formed second charge path to 2 chargings of second capacitor C, so that energy is transferred to second capacitor C 2 by first capacitor C 1.
Please refer to Fig. 5, be the 3rd embodiment of the disclosed flyback converter of the present invention.Illustrate another embodiment of energy storage circuit 210 among the figure.Energy storage circuit 210 as shown in the figure includes the current source CS and second capacitor C 2.When power switch Q1 transfers conducting to by not conducting, this moment, the first diode D1 and the second diode D2 became not on-state, this moment, the 3rd diode D3 also was in conducting state, therefore the energy that stores first capacitor C 1 can be via formed second charge path of current source CS to 2 chargings of second capacitor C, so that energy is transferred to second capacitor C 2 by first capacitor C 1.
The energy that is transferred to second capacitor C 2 by first capacitor C 1 can be supplied to controller 202 or other integrated circuit as power supply.Perhaps use to reduce the burden of auxiliary power as accessory power supply.
The disclosed embodiment according to the present invention, the first side winding Lp leakage inductance energy of transformer TX can store by energy storage circuit, and with the conversion efficiency of raising flyback converter, and the heat of minimizing flyback converter inside is to reduce temperature rise.On the other hand, the disclosed embodiment of the present invention can cooperate circuit design with stored energy integration in integrated circuit, to save outside accessory power supply.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (18)
1. circuit that leakage inductance energy utilizes again, be applied to a flyback converter, this flyback converter has a transformer, this transformer has a first side winding and a secondary side winding, wherein this first side winding is electrically connected to a power switch, this power switch is subjected to a controller and controls, this controller is exported the conducting and not conducting of this power switch of pulse-width modulation signal controlling, conducting by this power switch or not conducting are so that this flyback converter is changed a direct current input voltage is a direct current output voltage, it is characterized in that the circuit that this leakage inductance energy utilizes again includes:
One clamp circuit electrically connects with this first side winding of this transformer, in order to the cross-pressure that limits this power switch in a predetermined voltage;
One energy storage circuit; And
One switch, be electrically connected between this clamp circuit and this energy storage circuit, wherein when this not conducting of switch, this clamp circuit receives and stores the leakage inductance energy of this first side winding of this transformer, when this switch conduction, the energy that is stored in this clamp circuit is discharged in this energy storage circuit via this switch.
2. circuit according to claim 1, it is characterized in that, this clamp circuit includes: one first diode, one second diode, one the 3rd diode and one first electric capacity, this first diode, this first electric capacity is connected mutually with this second diode, this first electric capacity is electrically connected between this first diode and this second diode, the negative electrode of this first diode is electrically connected to first end of this first side winding, the anode of this second diode is electrically connected to second end of this first side winding, the negative electrode of the 3rd diode is electrically connected between the anode and this first electric capacity of this first diode, and the anode of the 3rd diode is electrically connected to earth terminal.
3. circuit according to claim 2 is characterized in that, this predetermined voltage is voltage and this DC input voitage sum at these first electric capacity two ends.
4. circuit according to claim 1 is characterized in that, this energy storage circuit includes one first resistance and connects mutually with one second electric capacity, and when this switch conduction, the energy that is stored in this clamp circuit is stored in this second electric capacity via this switch.
5. circuit according to claim 1, it is characterized in that, this energy storage circuit includes one first inductance, one second electric capacity and one the 4th diode and forms, it is characterized in that, one end of this first inductance and an end of this second electric capacity are connected in series, the other end of the negative electrode of the 4th diode and this first inductance electrically connects, the other end of the anode of the 4th diode and this second electric capacity electrically connects, when this switch conduction, the energy that is stored in this clamp circuit is stored in this second electric capacity via this switch.
6. circuit according to claim 1 is characterized in that, this energy storage circuit includes a current source and connects mutually with one second electric capacity, and when this switch conduction, the energy that is stored in this clamp circuit is stored in this second electric capacity via this switch.
7. circuit according to claim 1 is characterized in that, this switch is subjected to this controller and controls.
8. circuit according to claim 1 is characterized in that, the conducting of this this switch of pulse-width modulation signal controlling and not conducting.
9. circuit according to claim 1 is characterized in that, asynchronous conducting with this power switch of this switch or asynchronous not conducting.
10. the flyback converter with circuit that leakage inductance energy utilizes again is characterized in that, includes:
One transformer has a first side winding and a secondary side winding;
One power switch is electrically connected to this first side winding of this transformer, and conducting by this power switch or not conducting are so that this flyback converter is changed a direct current input voltage is a direct current output voltage;
One controller is in order to export the conducting and not conducting of a pulse-width modulation signal to control this power switch;
One clamp circuit electrically connects with this first side winding of this transformer, in order to the cross-pressure that limits this power switch in a predetermined voltage;
One energy storage circuit; And
One switch, be electrically connected between this clamp circuit and this energy storage circuit, when this not conducting of switch, this clamp circuit receives and stores the leakage inductance energy of this first side winding of this transformer, when this switch conduction, the energy that is stored in this clamp circuit is discharged in this energy storage circuit via this switch.
11. flyback converter according to claim 10, it is characterized in that, this clamp circuit includes: one first diode, one second diode, one the 3rd diode and one first electric capacity, this first diode, this first electric capacity is connected mutually with this second diode, this first electric capacity is electrically connected between this first diode and this second diode, the negative electrode of this first diode is electrically connected to first end of this first side winding, the anode of this second diode is electrically connected to second end of this first side winding, the negative electrode of the 3rd diode is electrically connected between the anode and this first electric capacity of this first diode, and the anode of the 3rd diode is electrically connected to earth terminal.
12. flyback converter according to claim 11 is characterized in that, this predetermined voltage is voltage and this DC input voitage sum at these first electric capacity two ends.
13. flyback converter according to claim 10, it is characterized in that, this energy storage circuit includes one first resistance and connects mutually with one second electric capacity, and when this switch conduction, the energy that is stored in this clamp circuit is stored in this second electric capacity via this switch.
14. flyback converter according to claim 10, it is characterized in that, this energy storage circuit includes one first inductance, one second electric capacity and one the 4th diode and forms, one end of this first inductance and an end of this second electric capacity are connected in series, the other end of the negative electrode of the 4th diode and this first inductance electrically connects, the other end of the anode of the 4th diode and this second electric capacity electrically connects, when this switch conduction, the energy that is stored in this clamp circuit is stored in this second electric capacity via this switch.
15. flyback converter according to claim 10, it is characterized in that this energy storage circuit includes a current source and connects mutually with one second electric capacity, it is characterized in that, when this switch conduction, the energy that is stored in this clamp circuit is stored in this second electric capacity via this switch.
16. flyback converter according to claim 10 is characterized in that, this switch is subjected to this controller and controls.
17. flyback converter according to claim 10 is characterized in that, the conducting of this this switch of pulse-width modulation signal controlling and not conducting.
18. flyback converter according to claim 10 is characterized in that, asynchronous conducting with this power switch of this switch or asynchronous not conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101232858A CN101355304B (en) | 2007-07-23 | 2007-07-23 | Circuit for reusing leakage inductance energy and flyback converter containing the circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101232858A CN101355304B (en) | 2007-07-23 | 2007-07-23 | Circuit for reusing leakage inductance energy and flyback converter containing the circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101355304A CN101355304A (en) | 2009-01-28 |
| CN101355304B true CN101355304B (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101232858A Expired - Fee Related CN101355304B (en) | 2007-07-23 | 2007-07-23 | Circuit for reusing leakage inductance energy and flyback converter containing the circuit |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053194B (en) * | 2009-11-05 | 2015-01-14 | 上海立隆微电子有限公司 | Output current sensing device and method used in primary side of flyback converter |
| US9000744B2 (en) | 2010-07-21 | 2015-04-07 | Fairchild Korea Semiconductor Ltd. | Switch control device with zero-cross point estimation by edge detection, power supply device comprising the same, and switch control method with zero-cross point estimation by edge detection |
| CN103457489B (en) * | 2013-09-25 | 2016-07-20 | 上海莱狮半导体科技有限公司 | Switched-mode power supply system and power supply circuits thereof |
| CN104717784B (en) * | 2013-12-13 | 2018-09-14 | 台达电子企业管理（上海）有限公司 | Light source driving circuit |
| CN103874295B (en) * | 2014-03-17 | 2016-06-08 | 杨岳毅 | Single-stage type LED driving power |
| CN104022655A (en) * | 2014-06-24 | 2014-09-03 | 上海大学 | Electrolytic capacitor-free LED driving power supply based on flyback converter leakage inductance energy utilization |
| US10008941B1 (en) * | 2016-12-22 | 2018-06-26 | Appulse Power Inc. | Auxiliary power supply for switch-mode power supplies |
| TWI729807B (en) * | 2019-11-11 | 2021-06-01 | 立錡科技股份有限公司 | Flyback power converter and active clamp snubber and overcharging protection circuit thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675796A (en) * | 1985-05-17 | 1987-06-23 | Veeco Instruments, Inc. | High switching frequency converter auxiliary magnetic winding and snubber circuit |
| US6487094B1 (en) * | 2001-10-10 | 2002-11-26 | Koninklijke Philips Electronics N.V. | High efficiency DC-DC power converter |
| CN1418398A (en) * | 2000-11-20 | 2003-05-14 | 皇家菲利浦电子有限公司 | Leakage energy recovering system and method for flyback converter |
| CN1636309A (en) * | 2000-11-20 | 2005-07-06 | 皇家菲利浦电子有限公司 | Voltage clamping system and method for a dc/dc power converter |
-
2007
- 2007-07-23 CN CN2007101232858A patent/CN101355304B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675796A (en) * | 1985-05-17 | 1987-06-23 | Veeco Instruments, Inc. | High switching frequency converter auxiliary magnetic winding and snubber circuit |
| CN1418398A (en) * | 2000-11-20 | 2003-05-14 | 皇家菲利浦电子有限公司 | Leakage energy recovering system and method for flyback converter |
| CN1636309A (en) * | 2000-11-20 | 2005-07-06 | 皇家菲利浦电子有限公司 | Voltage clamping system and method for a dc/dc power converter |
| US6487094B1 (en) * | 2001-10-10 | 2002-11-26 | Koninklijke Philips Electronics N.V. | High efficiency DC-DC power converter |
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| CN101355304A (en) | 2009-01-28 |
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