CN105915061A - Integration forward-flyback circuit employed by leakage inductance energy - Google Patents
Integration forward-flyback circuit employed by leakage inductance energy Download PDFInfo
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- CN105915061A CN105915061A CN201610287687.0A CN201610287687A CN105915061A CN 105915061 A CN105915061 A CN 105915061A CN 201610287687 A CN201610287687 A CN 201610287687A CN 105915061 A CN105915061 A CN 105915061A
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- circuit
- flyback
- leakage inductance
- diode
- transformator
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
Abstract
The present invention discloses an integration forward-flyback circuit employed by leakage inductance energy. The circuit comprises a primary side input circuit, a flyback secondary circuit, a forward secondary circuit and a filtering output circuit. A forward transformer TX1 and a flyback transformer TX2 are both worked in a high-frequency pulse width modulation state, the forward secondary circuit works when a switch tube Q is conducted, and the flyback secondary circuit works when the switch tube Q is turned off. Therefore, firstly, the leakage inductance energy of the flyback transformer TX2 is completely recovered and utilized, and the work efficiency of the converter is improved; secondly, the voltage of the switch tube Q is clamped so as to effectively reduce the voltage stress, and the forward secondary circuit is configure to directly transmit the leakage inductance energy to a load RL with no need for additional demagnetization winding; thirdly, the forward secondary circuit and the flyback secondary circuit alternately transmit energy to the load RL so as to facilitate reducing the output ripples; and fourth, there is only one switch tube Q which has a source connected with the ground, and a PWM driver is easier to design and realize.
Description
Technical field
The present invention relates to circuit engineering field, the integrated Forward-flyback circuit that a kind of leakage inductance energy utilizes.
Background technology
Along with the development of Power Electronic Technique, high frequency switch power has obtained studying widely and applying.Circuit of reversed excitation is because of simple in construction, and is capable of electrical isolation, is widely used in low power Switching Power Supply product.
Leakage inductance results from coil coupling not exclusively, and therefore leakage inductance occurs in the occasion of coil coupling, such as transformator, inducer.Circuit of reversed excitation is because of the existence of transformer leakage inductance so that the energy of transformer primary side can not absolutely be transferred to secondary, causes the incomplete of Energy harvesting, causes, while increasing loss, also reducing the efficiency of changer.
The existence of High Frequency Switching Converters leakage inductance is the biggest to the stress influence of circuit topology breaker in middle device, in the moment that contactor pipe disconnects, the energy of leakage inductance storage can produce counter electromotive force stress spike, easily cause switching device over-voltage breakdown, leakage inductance is also possible to form oscillation circuit with the distribution capacity in circuit, produces vibration outside radiated electromagnetic energy.Because anti exciting converter transformator is with air gap, so the leakage inductance of circuit of reversed excitation compares other isolated converters more greatly, the energy of leakage inductance storage is the most more, i.e. leakage inductance is much larger on the impact affecting other changers of comparison of circuit of reversed excitation.
How can the energy of simple and effective recycling leakage inductance, reduce switch tube voltage stress, the most numerous scientific workers and the goal in research of engineer simultaneously.
Summary of the invention
In view of this, the present invention is directed to the disappearance of prior art existence, its main purpose is to provide the integrated Forward-flyback circuit that a kind of leakage inductance energy utilizes, loss and additional device voltage stress that circuit of reversed excitation leakage inductance causes can be reduced, leakage inductance energy can recycle, improve transducer effciency, reduce switching device voltage stress.
For achieving the above object, the present invention uses such as purgation technical scheme:
The integrated Forward-flyback circuit that a kind of leakage inductance energy utilizes, including
One former limit input circuit, including diode D2, diode D3, electric capacity CS, switching tube Q, transformator TX1Primary inductor LP1, transformator TX2Primary inductor LP2；
One flyback secondary circuit, including diode D1, transformator TX1Secondary inductance LS1；
One normal shock secondary circuit, including diode D4, diode D5, inductance Lf, transformator TX2Secondary inductance LS2；
One filtering output circuit, including electric capacity C1；
Described transformator TX1Primary inductor LP1Same Name of Ends be connected with the positive pole of extraneous power supply Vin；Described transformator TX1Primary inductor LP1Non-same polarity be connected with the drain electrode of switching tube Q；The source electrode of described switching tube Q is connected with the negative pole of extraneous power supply Vin；Described transformator TX1Secondary inductance LS1Non-same polarity passes through diode D1Be connected to output filter capacitor C1Positive pole, described transformator TX1Secondary inductance LS1Same Name of Ends and output filter capacitor C1Negative pole is connected；Described transformator TX2Primary inductor LP2Same Name of Ends is connected with the source electrode of switching tube Q and extraneous power supply Vin negative pole；Described transformator TX2Primary inductor LP2Non-same polarity and diode D3P the most connected；Described transformator TX2Secondary inductance LS2Same Name of Ends passes through D4It is connected with output filter circuit；Described transformator TX2Secondary inductance LS2Non-same polarity and output filter capacitor C1Negative pole is connected.
As a kind of preferred version, described extraneous power supply Vin is an input dc power potential source, the positive pole of described extraneous power supply Vin connects the input anode of the integrated Forward-flyback circuit that described leakage inductance energy utilizes, and the negative pole of extraneous power supply Vin connects the input cathode of the integrated Forward-flyback circuit that described leakage inductance energy utilizes.
As a kind of preferred version, also include a load RL；Described load RLIt is connected to the output electrochemical capacitor C of the integrated Forward-flyback circuit that described leakage inductance energy utilizes1Between positive pole and negative pole.
As a kind of preferred version, described switching tube Q is a MOSFET；One end of described switching tube Q is the drain electrode of MOSFET, and the other end of described switching tube Q is the source electrode of MOSFET, and the control end of described switching tube Q is the grid of MOSFET.
As a kind of preferred version, described diode D1, diode D2, diode D3, diode D4, diode D5For fast recovery diode.
As a kind of preferred version, described electric capacity Cs is high frequency capacitance.
As a kind of preferred version, the mode of operation of the integrated Forward-flyback circuit that described leakage inductance energy utilizes is continuous current mode CCM, discontinuous current mode DCM or critical current mode BCM.
The present invention compared with prior art has clear advantage and beneficial effect, specifically, as shown from the above technical solution, the integrated Forward-flyback circuit that a kind of flyback leakage inductance energy of the present invention can recycle, including former limit input circuit, flyback secondary circuit, normal shock secondary circuit and filtering output circuit, normal shock transformator TX1, flyback transformer TX2All work in high-frequency pulsed width modulation state, normal shock secondary circuit work during switching tube Q conducting, and flyback secondary circuit work when switching tube Q turns off.So, first, flyback transformer TX2The energy of leakage inductance is essentially completely recovered utilization, improves the work efficiency of changer；The second, switching tube Q voltage is clamped, and can effectively reduce its voltage stress, and leakage inductance energy is directly delivered to load by normal shock secondary circuit, and without additional demagnetization winding；3rd, normal shock secondary circuit, flyback secondary circuit are alternately to load RLTransmission energy, advantageously reduces output ripple；4th, only one of which switching tube Q, and this switching tube Q source ground, pwm driver is more prone to design and realizes.
For more clearly illustrating architectural feature and effect of the present invention, next with specific embodiment below in conjunction with the accompanying drawings the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the integrated Forward-flyback circuit of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Fig. 2 is the first operation mode schematic diagram of integrated Forward-flyback circuit of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Fig. 3 is integrated Forward-flyback circuit the second operation mode schematic diagram of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Fig. 4 is the third operation mode schematic diagram of integrated Forward-flyback circuit of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Fig. 5 is the 4th kind of operation mode schematic diagram of integrated Forward-flyback circuit of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Fig. 6 is the 5th kind of operation mode schematic diagram of integrated Forward-flyback circuit of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Fig. 7 is the 6th kind of operation mode schematic diagram of integrated Forward-flyback circuit of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Fig. 8 is the integrated Forward-flyback circuit control block diagram of a kind of leakage inductance energy utilization of the preferred embodiments of the invention.
Accompanying drawing identifier declaration:
100, the integrated Forward-flyback circuit that leakage inductance energy utilizes
1, former limit input circuit
2, flyback secondary circuit
3, normal shock secondary circuit
4, filtering output circuit
1001, control chip
1002, current detection circuit
1003, voltage detecting circuit
1004, drive circuit.
Detailed description of the invention
Refer to shown in Fig. 1 to Fig. 8, that show the concrete structure of the preferred embodiments of the invention, be the integrated Forward-flyback circuit 100 of a kind of leakage inductance energy utilization, including former limit input circuit 1, flyback secondary circuit 2, normal shock secondary circuit 3 and filtering output circuit 4.Former limit input circuit 1 includes diode D2, diode D3, electric capacity CS, switching tube Q, transformator TX1Primary inductor LP1With transformator TX2Primary inductor LP2；Flyback secondary circuit 2 includes diode D1With transformator TX1Secondary inductance LS1；Normal shock secondary circuit 3 includes diode D4, diode D5, inductance LfWith transformator TX2Secondary inductance LS2；Filtering output circuit 4 includes electric capacity C1。
Wherein, described transformator TX1Primary inductor LP1Same Name of Ends be connected with the positive pole of extraneous power supply Vin；Described transformator TX1Primary inductor LP1Non-same polarity be connected with the drain electrode of switching tube Q；The source electrode of described switching tube Q is connected with the negative pole of extraneous power supply Vin；Described transformator TX1Secondary inductance LS1Non-same polarity passes through diode D1Be connected to output filter capacitor C1Positive pole, described transformator TX1Secondary inductance LS1Same Name of Ends and output filter capacitor C1Negative pole is connected；Described transformator TX2Primary inductor L P2Same Name of Ends is connected with the source electrode of switching tube Q and extraneous power supply Vin negative pole；Described transformator TX2Primary inductor LP2Non-same polarity and diode D3P the most connected；Described transformator TX2Secondary inductance LS2Same Name of Ends passes through D4It is connected with output filter circuit (4)；Described transformator TX2Secondary inductance LS2Non-same polarity and output filter capacitor C1Negative pole is connected.So, the superposition that the output electric current of the integrated Forward-flyback circuit of utilization is Forward-flyback winding current, output ripple can greatly reduce, and the power capacity of changer is bigger simultaneously.Flyback transformer TX1The energy of leakage inductance is essentially completely recovered utilization, improves the work efficiency of changer, and, switching tube Q voltage is clamped, and can effectively reduce its voltage stress.
In the present embodiment, described extraneous power supply Vin is an input dc power potential source, the positive pole of described extraneous power supply Vin connects the input anode of the integrated Forward-flyback circuit 100 that described leakage inductance energy utilizes, the negative pole of extraneous power supply Vin connects the input cathode of the integrated Forward-flyback circuit 100 that described leakage inductance energy utilizes, to provide DC voltage.
Also include a load RL；Described load RL is connected to the output electrochemical capacitor C of the integrated Forward-flyback circuit 100 that described leakage inductance energy utilizes1Between positive pole and negative pole.Leakage inductance energy is directly delivered to load R by normal shock secondary circuit 3L, and without additional demagnetization winding, normal shock secondary circuit 3 and flyback secondary circuit 2 alternately to load transmission energy, advantageously reduce output ripple.
Described switching tube Q is a power MOSFET；One end of described switching tube Q is the drain electrode of MOSFET, and the other end of described switching tube Q is the source electrode of MOSFET, and the control end of described switching tube Q is the grid of MOSFET.Due to only one of which switching tube Q of the present invention, and power MOSFET switch tube source ground, pwm driver is more prone to design and realizes.
Described diode D1, diode D2, diode D3, diode D4, diode D5For fast recovery diode, have the advantages that switching characteristic is good, reverse recovery time is short.
Described electric capacity Cs is high frequency capacitance, and it has high stability, and its capacitance is little affected by time, the impact of alternating current and direct current signal.And there is extremely low dielectric loss, the most high Q-value, ultralow ESR.
The mode of operation of the integrated Forward-flyback circuit (100) that described leakage inductance energy utilizes is continuous current mode CCM, discontinuous current mode DCM or critical current mode BCM.
The integrated Forward-flyback circuit 100 that a kind of leakage inductance energy of the present embodiment utilizes, positive and negative laser depressor all works in high-frequency pulsed width modulation state, and during switching tube Q conducting, normal shock secondary circuit 3 works, and when switching tube Q turns off, flyback secondary circuit 2 works.The integrated Forward-flyback circuit 100 that a kind of leakage inductance energy of the present embodiment utilizes is output as the superposition of Forward-flyback winding current, and output ripple can greatly reduce, and the power capacity of changer is bigger simultaneously.
Below with accompanying drawing 1 as main circuit structure, describe specific works principle and the operation mode of the integrated Forward-flyback circuit 100 of the leakage inductance energy utilization of the present invention in conjunction with accompanying drawing 2 to Fig. 7.
Operation mode 1: as in figure 2 it is shown, switching tube Q conducting, identify situation, flyback transformer TX according to Same Name of Ends1Primary inductor LP1Electric current linear rise, secondary does not has energy to export, flyback transformer TX1Primary inductor LP1Energy linearity increases；Normal shock winding works, D4Conducting, D5Cut-off, transmits energy to secondary, to output capacitance C1With load RLPower supply.Switching tube Q conducting is initial, due to the effect of Cs, normal shock transformator TX2Primary voltage nip bit is at VCsmax, Cs, Lp2, diode D3With the composition loop of power switch pipe Q, ignore diode drop, Cs electric discharge, Lp2Charging, this process lasts till that switching tube Q turns off.
Operation mode 2: as it is shown on figure 3, switching tube Q turns off, flyback transformer TX1Former limit maintains electric current constant, and under generation, just upper negative induced electromotive force, charges to the equivalent junction capacitance of switching tube Q, owing to junction capacity is the least, switching tube Q drain-source pole both end voltage approximately linear rises, and the drain voltage of switching tube Q rises rapidly uds=Vin+VCs, diode D2Conducting；Normal shock transformator TX2Primary side winding Lp2、D3、D2Magnetic reset circuit, normal shock transformator TX is formed with Vin2The vice-side winding pole reversal, D4Turn off, now filter inductance LfPass through D5Continue to output power supply.Until electric capacity CsBoth end voltage rises to n1Uo, flyback secondary circuit 2 is to load RLElectric discharge, i.e. enters mode 3.
Operation mode 3: as shown in Figure 4, flyback transformer TX1Leakage inductance pass through D2, Cs continue electric discharge, flyback transformer TX1Under just upper negative induced electromotive force make flyback transformer TX1Secondary side diode D1Because bearing forward voltage conducting, flyback winding works, and transmits energy to secondary, to output capacitance C1With load RLPower supply, flyback transformer TX simultaneously1The voltage of primary side winding is output voltage clamp-nVo；Filter inductance LfPass through D5Continue to output power supply, normal shock transformator TX2Primary side winding Lp2Continuing to be discharged to electric current is zero.
Operation mode 4: as it is shown in figure 5, this process flyback transformer TX1Vice-side winding works on, to output capacitance C1With load RLPower supply, flyback transformer TX1Primary inductor L p1, electric capacity Cs, diode D2Electric discharge is continued in the loop of composition, until electric current is reduced to zero.
Operation mode 5: as shown in Figure 6, flyback transformer TX1Secondary current gradually decreases to zero, and this process terminates.
Operation mode 6: as it is shown in fig. 7, secondary side diode D1, diode D4, diode D5It is turned off, now output capacitance C1To load RLPower supply, until the arrival of next cycle.
For realizing above operation principle, the control program of employing as shown in Figure 8: output is sent after voltage detecting circuit 103 voltage detecting and is processed with control chip 1001, produces PWM waveform；The electric current of switching tube Q delivers to control chip 1001 through current detection circuit 1002, to decide whether on-off switching tube Q；The PWM ripple produced drives switching tube Q through the drive circuit 1004 of corresponding enlarging function.
In sum, the design focal point of the present invention is, the integrated Forward-flyback circuit that a kind of flyback leakage inductance energy of the present invention can recycle, including former limit input circuit 1, flyback secondary circuit 2, normal shock secondary circuit 3 and filtering output circuit 4, normal shock transformator TX1, flyback transformer TX2All working in high-frequency pulsed width modulation state, during switching tube Q conducting, normal shock secondary circuit 3 works, and when switching tube Q turns off, flyback secondary circuit 2 works.So, first, flyback transformer TX2The energy of leakage inductance is essentially completely recovered utilization, improves the work efficiency of changer；The second, switching tube Q voltage is clamped, and can effectively reduce its voltage stress, and leakage inductance energy is directly delivered to load R by normal shock secondary circuit 3L, and without additional demagnetization winding；3rd, normal shock secondary circuit 3, flyback secondary circuit 2 are alternately to load RLTransmission energy, advantageously reduces output ripple；4th, only one of which switching tube Q, and this switching tube Q source ground, pwm driver is more prone to design and realizes.
The above, it it is only presently preferred embodiments of the present invention, not the technical scope of the present invention is imposed any restrictions, therefore every any trickle amendment, equivalent variations and modification above example made according to the technical spirit of the present invention, all still fall within the range of technical solution of the present invention.
Claims (7)
1. the integrated Forward-flyback circuit (100) that a leakage inductance energy utilizes, it is characterised in that: include
One former limit input circuit (1), including diode D2, diode D3, electric capacity CS, switching tube Q, transformator TX1Primary inductor LP1, transformator TX2Primary inductor L P2；
One flyback secondary circuit (2), including diode D1, transformator TX1Secondary inductance LS1；
One normal shock secondary circuit (3), including diode D4, diode D5, inductance Lf, transformator TX2Secondary inductance LS2；
One filtering output circuit (4), including electric capacity C1；
Described transformator TX1Primary inductor LP1Same Name of Ends be connected with the positive pole of extraneous power supply Vin；Described transformator TX1Primary inductor LP1Non-same polarity be connected with the drain electrode of switching tube Q；The source electrode of described switching tube Q is connected with the negative pole of extraneous power supply Vin；Described transformator TX1Secondary inductance LS1Non-same polarity passes through diode D1Be connected to output filter capacitor C1Positive pole, described transformator TX1Secondary inductance LS1Same Name of Ends and output filter capacitor C1Negative pole is connected；Described transformator TX2Primary inductor LP2Same Name of Ends is connected with the source electrode of switching tube Q and extraneous power supply Vin negative pole；Described transformator TX2Primary inductor LP2Non-same polarity and diode D3P the most connected；Described transformator TX2Secondary inductance LS2Same Name of Ends passes through D4It is connected with output filter circuit (4)；Described transformator TX2Secondary inductance LS2Non-same polarity and output filter capacitor C1Negative pole is connected.
The integrated Forward-flyback circuit (100) that a kind of leakage inductance energy the most according to claim 1 utilizes, it is characterized in that: described extraneous power supply Vin is an input dc power potential source, the positive pole of described extraneous power supply Vin connects the input anode of the integrated Forward-flyback circuit (100) that described leakage inductance energy utilizes, and the negative pole of extraneous power supply Vin connects the input cathode of the integrated Forward-flyback circuit (100) that described leakage inductance energy utilizes.
The integrated Forward-flyback circuit (100) that a kind of leakage inductance energy the most according to claim 1 utilizes, it is characterised in that: also include a load RL；Described load RLIt is connected to the output electrochemical capacitor C of the integrated Forward-flyback circuit (100) that described leakage inductance energy utilizes1Between positive pole and negative pole.
The integrated Forward-flyback circuit (100) that a kind of leakage inductance energy the most according to claim 1 utilizes, it is characterised in that: described switching tube Q is a MOSFET；One end of described switching tube Q is the drain electrode of MOSFET, and the other end of described switching tube Q is the source electrode of MOSFET, and the control end of described switching tube Q is the grid of MOSFET.
The integrated Forward-flyback circuit (100) that a kind of leakage inductance energy the most according to claim 1 utilizes, it is characterised in that: described diode D1, diode D2, diode D3, diode D4, diode D5For fast recovery diode.
The integrated Forward-flyback circuit (100) that a kind of leakage inductance energy the most according to claim 1 utilizes, it is characterised in that: described electric capacity Cs is high frequency capacitance.
The integrated Forward-flyback circuit (100) that a kind of leakage inductance energy the most according to claim 1 utilizes, it is characterised in that: the mode of operation of the integrated Forward-flyback circuit (100) that described leakage inductance energy utilizes is continuous current mode CCM, discontinuous current mode DCM or critical current mode BCM.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610287687.0A CN105915061A (en) | 2016-05-04 | 2016-05-04 | Integration forward-flyback circuit employed by leakage inductance energy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610287687.0A CN105915061A (en) | 2016-05-04 | 2016-05-04 | Integration forward-flyback circuit employed by leakage inductance energy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106655780A (en) * | 2016-10-19 | 2017-05-10 | 南京博兰得电子科技有限公司 | Isolated power transformation device |
| CN113114040A (en) * | 2021-03-25 | 2021-07-13 | 北京交通大学 | High-gain forward-flyback laminated boost converter |
| CN114301295A (en) * | 2020-10-07 | 2022-04-08 | 浙江杭可仪器有限公司 | Direct-current integrated power supply and design method thereof |
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