CN102055340A - Method for controlling full-bridge direct current-direct current converter - Google Patents
Method for controlling full-bridge direct current-direct current converter Download PDFInfo
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Abstract
The invention provides a method for controlling a full-bridge direct current-direct current converter. The full-bridge direct current-direct current converter comprising a primary circuit and a secondary circuit is adopted in the method; the primary circuit comprises an input voltage source, first to fourth switching devices and a transformer for coupling the primary circuit and the secondary circuit; and the secondary circuit has rectifying and filtering functions. The control signals of the upper and lower switching devices of the same bridge arm are in a complementary relationship in a switching period; the control signals of the switching devices at the same position of different bridge arms are in an opposite phase relationship; and the control method acquires the similar zero voltage switch-on of the switching devices as a phase shifting control method. Control of output voltage or current is realized by pulse width modulation of the conduction time of the first to fourth switching devices. Compared with the conventional phase shifting control method, the method is simple, and has low cost and wider application.
Description
Technical field
The present invention relates to field of switch power, particularly relate to a kind of control method of full-bridge direct current-DC converter.
Background technology
In the DC-DC converter of Switching Power Supply class, the full-bridge topologies is widely used in voltage transitions, as United States Patent (USP) 4864479 and 5132889 disclosed converters.In existing full-bridge controlling schemes, the no-voltage that phase-shifting control method utilizes the parasitic parameter in switching device, transformer and the circuit to reach switching device is opened effect, is optimum on performance at present.No-voltage is opened in high frequency switch power, and is especially significant to reducing the loss that causes because of switch and reducing electromagnetic interference in high-voltage switch power supply.Many tame semiconductor manufacturers provide the chip of realizing the bridge Phase shifted PWM Controlled method.
The circuit of the full-bridge direct current-DC converter of employing phase-shifting control method as shown in Figure 1, this full-bridge direct current-DC converter comprises former sideline road 20 and pays sideline road 30, and former sideline road 20 comprises input voltage source 21, with input voltage source 21 coupling and first brachium pontis 22 that constitute by the first switching device S1 and second switch device S2, with input voltage source 21 coupling and second brachium pontis 23 that constitute by the 3rd switching device S3 and the 4th switching device S4, former sideline road 20 and the transformer T that pays sideline road 30 are coupled, be connected across the former limit of the transformer winding 24 between the first brachium pontis mid point and the second brachium pontis mid point, the branch road that is in series with the leakage inductance or the external resonant inductance LP of transformer, bridge Phase shifted PWM Controlled device 25.Pay sideline road 30 and adopt the representative rectifier structure of recommending, it comprises, and the 5th switching device S5, the 6th switching device S6, first transformer are paid limit winding 31, second transformer is paid limit winding 32, outputting inductance Lo, output capacitance Co, load R
LWith error amplifier 36.
Main waveform in the signal of existing phase-shifting control method and the converter as shown in Figure 2, the control signal D_S2 of the control signal D_S1 of the first switching device S1 and second switch S2 becomes anti-phase relation in switch periods, and there is a dead band (the 3rd among Fig. 2 be t3 to the four moment t4 and the 7th moment t7 to the eight moment t8 constantly) in duty ratio identical (near 50%) between both conducting districts.Equally, the control signal D_S4 of the control signal D_S3 of the 3rd switching device S3 and the 4th switching device S4 also becomes anti-phase relation in switch periods, and there is a dead band (first among Fig. 2 be t1 to the second moment t2 and the 5th moment t5 to the six moment t6 constantly) in duty ratio identical (near 50%) between both conducting districts.The high level of the control signal of switching device is represented conducting, and low level is represented to turn-off.Phase shift is meant the phase shift between the switching time of same position switching device in two brachium pontis.In Fig. 2, there is phase shift (initial time t0 to the second is t2 constantly) in the conducting period of the first switching device S1 and the 3rd switching device S3.From the waveform of paying limit commutating voltage Vs as can be seen, this phase shift has directly determined waveform and the duty ratio of Vs, has also just realized the control (mean value of Vs in switch periods equals output voltage) to output voltage.Dead band of the interval existence of the upper switch device of each brachium pontis and the conducting of lower switch device.Electric current in this dead band in leakage inductance or the magnetizing inductance is to the junction capacitance charging of the switching device that is turned off, make the first brachium pontis mid-point voltage VB1, the second brachium pontis mid-point voltage VB2 among Fig. 2, the rising of paying limit commutating voltage Vs and decline all present the process that a resonance changes, and make, thereby realize that no-voltage is open-minded with the natural conducting of the body diode of the MOSFET pipe that is about in the arm open.In actual applications, when the leakage inductance of transformer is not enough, resonant inductance of former limit serial connection of the transformer of being everlasting.In the phase-shifting control method of Fig. 2, it is open-minded that the first switching device S1 and second switch device S2 can obtain no-voltage naturally; It is relevant with energy in the resonant inductance that the 3rd switching device S3 and the no-voltage of the 4th switching device S4 are opened condition, thereby relevant with design and working point.
The weak point of phase-shifting control method is that this method realizes adjusting to output voltage with the phase shift form, so controller implements complicatedly, and the pulse width modulation controlled chip of numerous high performance-price ratios can't be used on the market.The existing phase shifting control chip of industrial quarters exists volume big, needs more peripheral cell, and shortcoming such as cost height.
Summary of the invention
Technical problem to be solved by this invention provides a kind of control method of full-bridge direct current-DC converter, realize that the no-voltage in the phase-shifting control method is open-minded, by output voltage or electric current being controlled, overcome in the phase-shifting control method simultaneously because of controlling the shortcoming that complexity is brought to the simplification of control signal with in the mode of pulse-width modulation.
The present invention solves above-mentioned technical problem by following technical proposals: a kind of control method of full-bridge direct current-DC converter, this method adopts the full-bridge direct current-DC converter that comprises former sideline road and pay the sideline road, former sideline road comprises input voltage source, with input voltage source coupling and by one first switching device and first brachium pontis that the second switch device is connected and constituted, with input voltage source coupling and by one the 3rd switching device and one the 4th second brachium pontis that switching device is connected and constituted, former sideline road and the transformer of paying the sideline road are coupled, be connected across the former limit of a transformer winding between the first brachium pontis mid point and the second brachium pontis mid point, the branch road of connecting with the leakage inductance or the external resonant inductance of transformer is paid the sideline road and is comprised rectification and filter function; It is characterized in that the control signal of the control signal of first switching device and second switch device becomes complementary relationship in switch periods; The control signal of the control signal of the 3rd switching device and the 4th switching device becomes complementary relationship in switch periods; First switching device is identical with the ON time of the 3rd switching device, and phase place is opposite; The second switch device is identical with the ON time of the 4th switching device, and phase place is opposite.
Preferably, the control method of described full-bridge direct current-DC converter is carried out pulse-width modulation by the complementary anti-phase controller of a full-bridge to the ON time of first to fourth switching device, realizes the control to output voltage or electric current.
Preferably, the complementary anti-phase controller of the full-bridge that the control method of described full-bridge direct current-DC converter is coupled by an error amplifier with described error amplifier is finished described ON time to first to fourth switching device and is carried out pulse-width modulation, realizes the control to output voltage or electric current.
Preferably, there is first Dead Time in opening of the shutoff of described first switching device moment and second switch device between the moment; There is second Dead Time in opening of the shutoff moment of the 4th switching device and the 3rd switching device between the moment; There is the 3rd Dead Time in opening of the shutoff moment of the 3rd switching device and the 4th switching device between the moment; There is the 4th Dead Time in opening of the shutoff moment of second switch device and first switching device between the moment.
Preferably, described first to fourth Dead Time is independently set or is coupled with the signal of telecommunication in this full-bridge direct current-DC converter, makes switching device obtain the condition that no-voltage is opened to greatest extent.
Preferably, the setting of described first to fourth Dead Time and the load current of this DC-DC converter are coupled, and make switching device obtain the condition that no-voltage is opened to greatest extent.
Preferably, the ON time of described first switching device and the 3rd switching device is in whole steady operation points of full-bridge direct current-DC converter ON time less than second switch device and the 4th switching device.
Preferably, the ON time of described first switching device and the 3rd switching device is in whole steady operation points of full-bridge direct current-DC converter ON time greater than second switch device and the 4th switching device.
Preferably, described first switching device to the, four switching devices all comprise shunt capacitance and diode.
Preferably, described first switching device to the, four switching devices all adopt the MOSFET pipe and all comprise junction capacitance and body diode, the former limit of a transformer winding resonant inductance of serial connection and/or a capacitance.
Preferably, the control method of described full-bridge direct current-DC converter comprises following steps in a switch periods:
Initial time to the first moment: first switching device and the 4th switching device conducting;
First constantly to second moment: first switching device turn-offs constantly first, the electric current of resonant inductance is the comprehensive of load current and exciting current, this electric current is to the junction capacitance charging of first switching device, to the junction capacitance discharge of second switch device, make the body diode conducting of second switch device simultaneously;
Second constantly to the 3rd moment: no-voltage is open-minded constantly second for the second switch device, and the voltage that transformer former limit winding and transformer are paid the limit winding is zero, and outputting inductance provides energy to load;
The 3rd constantly to the 4th moment: the 4th switching device turn-offs constantly the 3rd, electric current in the resonant inductance begins the junction capacitance charging to the 4th switching device, simultaneously the junction capacitance of the 3rd switching device is discharged, if the resonant inductance energy is abundant, the then body diode conducting of the 3rd switching device;
The 4th constantly to the 5th moment: no-voltage is open-minded constantly the 4th under the sufficient condition of resonant inductance energy for the 3rd switching device; Input voltage source provides energy to outputting inductance and load;
The 5th constantly to the 6th moment: the 3rd switching device turn-offs constantly the 5th, the electric current of resonant inductance is the comprehensive of load current and exciting current, this electric current is to the junction capacitance charging of the 3rd switching device, to the junction capacitance discharge of the 4th switching device, make the body diode conducting of the 4th switching device simultaneously;
The 6th constantly to the 7th moment: no-voltage is open-minded constantly the 6th for the 4th switching device, and the voltage that transformer former limit winding and transformer are paid the limit winding is zero, and outputting inductance provides energy to load;
The 7th moment to the 8th moment: the second switch device turn-offs constantly the 7th, and the electric current of resonant inductance begins the junction capacitance charging to the second switch device, simultaneously the junction capacitance of first switching device is discharged; If the resonant inductance energy is abundant, the body diode conducting of first switching device, no-voltage is open-minded constantly the 8th for first switching device.
Positive progressive effect of the present invention is: the control method of full-bridge direct current-DC converter of the present invention obtains optimum performance with foolproof control mode, thereby the no-voltage that makes full-bridge direct current-DC converter is opened technology and is used widely at various applied environments, improve the efficient of converter, reduce the volume of converter, reduce the cost of converter, reduce the loss of electric energy simultaneously.
Description of drawings
Fig. 1 is the conspectus of existing full-bridge direct current-DC converter.
Fig. 2 adopts the control signal of switching device in the full-bridge direct current-DC converter that has phase-shifting control method now and the main oscillogram in the converter.
Fig. 3 is the conspectus that adopts the full-bridge direct current-DC converter of control method of the present invention.
Fig. 4 adopts the control signal of switching device in the full-bridge direct current-DC converter of control method of the present invention and the main oscillogram in the converter.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The invention provides a kind of control method that is used for full-bridge direct current-DC converter.Adopt this control method full-bridge direct current-DC converter circuit as shown in Figure 3.This full-bridge direct current-DC converter comprises former sideline road 20 and pays sideline road 30, and former sideline road 20 comprises input voltage source 21, with input voltage source 21 coupling and first brachium pontis 22 that constitute by the first switching device S1 and second switch device S2, with input voltage source 21 coupling and second brachium pontis 23 that constitute by the 3rd switching device S3 and the 4th switching device S4, former sideline road 20 and the transformer T that pays sideline road 30 are coupled, be connected across the former limit of the transformer winding 24 between the first brachium pontis mid point and the second brachium pontis mid point, the branch road that is in series with the leakage inductance or the external resonant inductance LP of transformer, the complementary anti-phase controller 26 of full-bridge.Pay sideline road 30 and adopt the representative rectifier structure of recommending, pay a sideline road 30 and comprise that the 5th switching device S5, the 6th switching device S6, first transformer are paid limit winding 31, second transformer is paid limit winding 32, outputting inductance Lo, output capacitance Co, load R
LWith error amplifier 36.
The first switching device S1 among Fig. 3, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 are MOSFET pipe (Metal Oxide Semiconductor Field EffectTransistor, metal oxide semiconductor field effect tube), these four switching devices all comprise junction capacitance and inverse parallel body diode.All switching device also can be the switching device of other type.The 5th switching device S5 and the 6th switching device S6 are diodes, also can be MOSTFET pipe or other active switching device.The topology of paying the sideline road can adopt other form, to this control method and not influence of characteristic thereof.
The signal of control method of the present invention and waveform as shown in Figure 4, the control signal D_S1 of the first switching device S1 becomes complementary relationship with the control signal D_S2 of second switch device S2 in switch periods; The control signal D_S4 of the control signal D_S3 of the 3rd switching device S3 and the 4th switching device S4 becomes complementary relationship in switch periods; The first switching device S1 is identical with the ON time of the 3rd switching device S3, phase place opposite (180 ° of phase differences), and duty ratio is less than 50%.Second switch device S2 is identical with the ON time of the 4th switching device S4, and phase place is opposite, and duty ratio is greater than 50%.Error amplifier 36 is coupled with the complementary anti-phase controller 26 of full-bridge, error amplifier 36 is according to the difference generation control signal of the amount of being conditioned with set point, after isolating circuit (if necessary), former pair of limit be input to the complementary anti-phase controller 26 of full-bridge, produce to give control signal D_S1, D_S2, D_S3 and the D_S4 of switching device, realize control output voltage or electric current by pulse-width modulation to the ON time of first to fourth switching device.
Control method of the present invention comprises following steps in a switch periods:
Initial time t0 to the first is t1 constantly: the first switching device S1 and the 4th switching device S4 conducting, the voltage of input voltage source is added on the former limit of the transformer winding 24, transformer is paid the voltage of limit winding by the left end that the 5th switching device S5 acts on outputting inductance Lo, orders about the electric current rising among the outputting inductance Lo.The proportional relation of the electric current of the current i LP of resonant inductance LP and outputting inductance Lo is so also rise.Electric energy reaches outputting inductance and load by input voltage source.
First moment t1 to the second is t2 constantly: this is first Dead Time.The first switching device S1 is in the first t1 shutoff constantly, and the current i LP of resonant inductance LP is the comprehensive of load current and exciting current, and this electric current discharges to the junction capacitance of second switch device S2 simultaneously to the junction capacitance charging of the first switching device S1.Paying the limit commutating voltage Vs and the first brachium pontis mid-point voltage VB1 descends simultaneously.After the first brachium pontis mid-point voltage VB1 dropped to zero, the body diode of second switch device S2 began conducting.The voltage that transformer former limit winding and transformer are paid the limit winding is zero.
Second t2 to the three t3 constantly constantly: after the voltage that above-mentioned transformer former limit winding and transformer are paid the limit winding dropped to zero, the t2 no-voltage was open-minded constantly second for second switch device S2.Second moment t2 to the three t3 constantly is commonly referred to as refluxing stage during this period of time.Electric current among the outputting inductance Lo is paid limit winding 31, the 6th switching device S6 and second transformer through the 5th switching device S5, first transformer and is paid limit winding 32 at a pair side ring stream, and amplitude reduces, and outputting inductance Lo is to load R
LElectric energy is provided.The current i LP of resonant inductance reduces under the conduction voltage drop effect of components and parts, and simultaneously the electric current paid in the branch road that limit winding 32 constitutes of the 6th switching device S6 and second transformer correspondingly rises.
The 3rd moment t3 to the four is t4 constantly: this is second Dead Time.The 4th switching device S4 is in the 3rd t3 shutoff constantly, and the current i LP among the resonant inductance LP begins the junction capacitance charging to the 4th switching device S4, simultaneously the junction capacitance of the 3rd switching device S3 is discharged.The second brachium pontis mid-point voltage VB2 rises with the resonance form.As long as the energy among the resonant inductance LP is abundant, this resonant process just can make the second brachium pontis mid-point voltage VB2 rise to the level of input voltage always, make the body diode conducting of the 3rd switching device S3, and then the t4 no-voltage is open-minded constantly the 4th to make the 3rd switching device S3.If the energy shortage among the resonant inductance LP, the voltage on the junction capacitance of the 3rd switching device S3 can not be discharged fully, and the no-voltage of the 3rd switching device S3 is just opened and can not be realized.
The 4th moment t4 to the five is t5 constantly: second switch device S2 and the 3rd switching device S3 conducting, the voltage of input voltage source is added on the former limit of the transformer winding 24, transformer is paid the voltage of limit winding by the left end that the 6th switching device S6 acts on outputting inductance Lo, orders about the electric current rising among the outputting inductance Lo.The current i LP of resonant inductance LP and pair proportional relation of limit electric current are so also rise.Electric energy reaches outputting inductance and load by input voltage source.
The 5th moment t5 to the six is t6 constantly: this is the 3rd Dead Time.The 3rd switching device S3 is in the 5th t5 shutoff constantly, and the current i LP of resonant inductance LP is the comprehensive of load current and exciting current, and this electric current discharges to the junction capacitance of the 4th switching device S4 simultaneously to the junction capacitance charging of the 3rd switching device S3.Paying the limit commutating voltage Vs and the second brachium pontis mid-point voltage VB2 descends simultaneously.After the second brachium pontis mid-point voltage VB2 dropped to zero, the body diode of the 4th switching device S4 began conducting.The voltage former, that pay the limit winding of transformer is zero.
The 6th t6 to the seven t7 constantly constantly: after the voltage that above-mentioned transformer former limit winding and transformer are paid the limit winding dropped to zero, the t6 no-voltage was open-minded constantly the 6th for the 4th switching device S4.The 6th moment t6 to the seven t7 constantly is commonly referred to as refluxing stage during this period of time.Electric current among the outputting inductance Lo is paid limit winding 32, the 5th switching device S5 and first transformer through the 6th switching device S6, second transformer and is paid limit winding 31 at a pair side ring stream, and amplitude reduces, and outputting inductance Lo provide electric energy to load.The current i LP of resonant inductance reduces under the conduction voltage drop effect of components and parts, and simultaneously the electric current paid in the branch road that limit winding 31 constitutes of the 5th switching device S5 and first transformer correspondingly rises.
The 7th moment t7 to the eight is t8 constantly: this is the 4th Dead Time.Second switch device S2 is in the 7th t7 shutoff constantly, and the current i LP of resonant inductance LP begins the junction capacitance charging to second switch device S2, simultaneously the junction capacitance of the first switching device S1 is discharged.The first brachium pontis mid-point voltage VB1 rises with the resonance form.As long as the energy among the resonant inductance LP is abundant, this resonance just can make the first brachium pontis mid-point voltage VB1 rise to the level of input voltage always, make the body diode conducting of the first switching device S1, and then the t8 no-voltage is open-minded constantly the 8th to make the first switching device S1.If the energy shortage in the resonant inductance, the voltage on the junction capacitance of the first switching device S1 can not be discharged fully, and the no-voltage of the first switching device S1 is just opened and can not be realized.
As can be seen from the above, with coming to the same thing of traditional phase-shifting control method, all can to obtain no-voltage under suitable design open-minded for switching devices.It is open-minded that second switch device S2 and the 4th switching device S4 obtain no-voltage naturally; It is relevant with energy in the resonant inductance that the first switching device S1 and the no-voltage of the 3rd switching device S3 are opened condition.
In the practical application of full-bridge direct current-DC converter, can connect-individual capacitance on the winding of the former limit of transformer, can be unsaturated to guarantee transformer.In the practical application of full-bridge direct current-DC converter, when the parasitic junction capacitance of switching device is not enough, can add shunt capacitance.
First to fourth Dead Time in the above-mentioned control method can relatedly or independent be set, and can be coupled with the signal of telecommunication of this DC-DC converter, especially is coupled with load current, opens condition thereby make switching device obtain no-voltage to greatest extent.
Above-mentioned control method is applicable to another kind of pattern: o'clock greater than 50%, the conducting duty ratio of second switch device and the 4th switching device is less than 50% at the steady operation of full-bridge direct current-DC converter for the conducting duty ratio of first switching device and the 3rd switching device.At this moment, during above-mentioned " refluxing stage ", the first brachium pontis mid-point voltage VB1 and the second brachium pontis mid-point voltage VB2 will be in the level of input voltage.One of benefit of this pattern be the first switching device S1 of top and the 3rd switching device S3 to obtain no-voltage naturally open-minded, its driving force can design more weakly, is of value to the design of the unsteady driver circuit of upper switch.
In the above-mentioned control method, the ON time of first switching device and the 3rd switching device whole steady operation points of full-bridge direct current-DC converter less than or greater than the ON time of second switch device and the 4th switching device.
Though above-mentioned control method just tackles the narration that the push-pull topology on limit carries out, its principle is suitable equally to the topological structure on multiple pair of limit, comprises the full-bridge of paying the limit, circuit such as stream doubly.
Though above-mentioned control method is just opened the description of being done at the no-voltage of switching device.Operation is opened or opened firmly to corresponding part no-voltage to be suitable for too.Here " the part no-voltage is open-minded " is meant that the part switching device is arranged is open-minded under the condition of no-voltage in the switching device of full-bridge, and remaining is not.In the application of relatively low voltage, the part no-voltage is opened or opened firmly is very widely used mode.
Used the MOSFET pipe as device for power switching in the description of above-mentioned control method.This control method is equally applicable to any other and possesses the device of switching characteristic.If used switching device does not have body diode, then to add parallel diode.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.
Claims (10)
1. the control method of a full-bridge direct current-DC converter, this method adopts the full-bridge direct current-DC converter that comprises former sideline road and pay the sideline road, former sideline road comprises input voltage source, with input voltage source coupling and by one first switching device and first brachium pontis that the second switch device is connected and constituted, with input voltage source coupling and by one the 3rd switching device and one the 4th second brachium pontis that switching device is connected and constituted, former sideline road and the transformer of paying the sideline road are coupled, be connected across the former limit of a transformer winding between the first brachium pontis mid point and the second brachium pontis mid point, the branch road of connecting with the leakage inductance or the external resonant inductance of transformer is paid the sideline road and is comprised rectification and filter function; It is characterized in that the control signal of the control signal of first switching device and second switch device becomes complementary relationship in switch periods; The control signal of the control signal of the 3rd switching device and the 4th switching device becomes complementary relationship in switch periods; First switching device is identical with the ON time of the 3rd switching device, and phase place is opposite; The second switch device is identical with the ON time of the 4th switching device, and phase place is opposite.
2. the control method of full-bridge direct current-DC converter as claimed in claim 1, it is characterized in that, the control method of described full-bridge direct current-DC converter is carried out pulse-width modulation by the complementary anti-phase controller of a full-bridge to the ON time of first to fourth switching device, realizes the control to output voltage or electric current.
3. the control method of full-bridge direct current-DC converter as claimed in claim 1 is characterized in that, there is first Dead Time in opening of the shutoff moment of described first switching device and second switch device between the moment; There is second Dead Time in opening of the shutoff moment of the 4th switching device and the 3rd switching device between the moment; There is the 3rd Dead Time in opening of the shutoff moment of the 3rd switching device and the 4th switching device between the moment; There is the 4th Dead Time in opening of the shutoff moment of second switch device and first switching device between the moment.
4. the control method of full-bridge direct current-DC converter as claimed in claim 3, it is characterized in that, described first to fourth Dead Time is independently set or is coupled with the signal of telecommunication in this full-bridge direct current-DC converter, makes switching device obtain the condition that no-voltage is opened to greatest extent.
5. the control method of full-bridge direct current-DC converter as claimed in claim 3, it is characterized in that, the setting of described first to fourth Dead Time and the load current of this DC-DC converter are coupled, and make switching device obtain the condition that no-voltage is opened to greatest extent.
6. the control method of full-bridge direct current-DC converter as claimed in claim 1, it is characterized in that the ON time of described first switching device and the 3rd switching device is in whole steady operation points of full-bridge direct current-DC converter ON time less than second switch device and the 4th switching device.
7. the control method of full-bridge direct current-DC converter as claimed in claim 1, it is characterized in that the ON time of described first switching device and the 3rd switching device is in whole steady operation points of full-bridge direct current-DC converter ON time greater than second switch device and the 4th switching device.
8. the control method of full-bridge direct current-DC converter as claimed in claim 1 is characterized in that, described first switching device to the, four switching devices all comprise shunt capacitance and diode.
9. the control method of full-bridge direct current-DC converter as claimed in claim 1, it is characterized in that, described first switching device to the, four switching devices all adopt the MOSFET pipe and all comprise junction capacitance and body diode, the former limit of a transformer winding resonant inductance of serial connection and/or a capacitance.
10. the control method of full-bridge direct current-DC converter as claimed in claim 9 is characterized in that, the control method of described full-bridge direct current-DC converter comprises following steps in a switch periods:
Initial time to the first moment: first switching device and the 4th switching device conducting;
First constantly to second moment: first switching device turn-offs constantly first, the electric current of resonant inductance is the comprehensive of load current and exciting current, this electric current is to the junction capacitance charging of first switching device, to the junction capacitance discharge of second switch device, make the body diode conducting of second switch device simultaneously;
Second constantly to the 3rd moment: no-voltage is open-minded constantly second for the second switch device, and the voltage that transformer former limit winding and transformer are paid the limit winding is zero, and outputting inductance provides energy to load;
The 3rd constantly to the 4th moment: the 4th switching device turn-offs constantly the 3rd, electric current in the resonant inductance begins the junction capacitance charging to the 4th switching device, simultaneously the junction capacitance of the 3rd switching device is discharged, if the resonant inductance energy is abundant, the then body diode conducting of the 3rd switching device;
The 4th constantly to the 5th moment: no-voltage is open-minded constantly the 4th under the sufficient condition of resonant inductance energy for the 3rd switching device; Input voltage source provides energy to outputting inductance and load;
The 5th constantly to the 6th moment: the 3rd switching device turn-offs constantly the 5th, the electric current of resonant inductance is the comprehensive of load current and exciting current, this electric current is to the junction capacitance charging of the 3rd switching device, to the junction capacitance discharge of the 4th switching device, make the body diode conducting of the 4th switching device simultaneously;
The 6th constantly to the 7th moment: no-voltage is open-minded constantly the 6th for the 4th switching device, and the voltage that transformer former limit winding and transformer are paid the limit winding is zero, and outputting inductance provides energy to load;
The 7th moment to the 8th moment: the second switch device turn-offs constantly the 7th, and the electric current of resonant inductance begins the junction capacitance charging to the second switch device, simultaneously the junction capacitance of first switching device is discharged; If the resonant inductance energy is abundant, the body diode conducting of first switching device, no-voltage is open-minded constantly the 8th for first switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910198141 CN102055340B (en) | 2009-11-03 | 2009-11-03 | Method for controlling full-bridge direct current-direct current converter |
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| CN103825444A (en) * | 2014-02-19 | 2014-05-28 | 倪兆瑞 | Method for quickly starting full-bridge converter |
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| TWI488421B (en) * | 2013-04-03 | 2015-06-11 | Delta Electronics Inc | Dc-to-ac power conversion system and method of operating the same |
| CN104734520A (en) * | 2015-03-23 | 2015-06-24 | 深圳市皓文电子有限公司 | DC/DC converter |
| CN104967320A (en) * | 2015-06-10 | 2015-10-07 | 无锡中汇汽车电子科技有限公司 | Control method of full-bridge converter of asymmetric duty ratios |
| CN106558999A (en) * | 2015-09-30 | 2017-04-05 | 株式会社村田制作所 | DC/DC conversion equipments |
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| CN114175481A (en) * | 2019-07-18 | 2022-03-11 | Ls电气株式会社 | DC-DC converter of power conversion system |
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