CN112583270B - Multiple phase-shifting control method and device for double-active full-bridge DC/DC converter and charger - Google Patents
Multiple phase-shifting control method and device for double-active full-bridge DC/DC converter and charger Download PDFInfo
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- CN112583270B CN112583270B CN201910940567.XA CN201910940567A CN112583270B CN 112583270 B CN112583270 B CN 112583270B CN 201910940567 A CN201910940567 A CN 201910940567A CN 112583270 B CN112583270 B CN 112583270B
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a multiple phase-shifting control method, a device and a charger of a double-active full-bridge DC/DC converter, wherein the double-active full-bridge DC/DC converter comprises a primary side voltage source, a primary side H-bridge unit, a transformer, a secondary side H-bridge unit and a secondary side voltage source, and the multiple phase-shifting control method comprises the following steps: determining to perform voltage reduction phase shift control or voltage boosting phase shift control according to the voltage value of the primary side voltage source, the voltage value of the secondary side voltage source and the transformation ratio of the transformer; when the step-down phase-shift control or the step-up phase-shift control is carried out, the single phase-shift state, the double phase-shift state and the triple phase-shift state are switched according to the transmission power of the double-active full-bridge DC/DC converter, and corresponding phase shift angles are determined. The invention can ensure the realization effect of the zero-voltage switch in the whole range, thereby reducing the switching-on loss of the switching tube and improving the working efficiency of the converter.
Description
Technical Field
The invention relates to the technical field of control of DC/DC converters, in particular to a multiple phase-shifting control method of a double-active full-bridge DC/DC converter, a multiple phase-shifting control device of the double-active full-bridge DC/DC converter and a charger.
Background
At present, the traditional control algorithm of the double-active full-bridge DC/DC converter mostly adopts single phase-shift control, or single double phase-shift control and single triple phase-shift control. The disadvantage of these control methods is that when the variation range of the original secondary power Voltage is large, the Zero Voltage Switching (ZVS) in the full range is relatively poor.
Disclosure of Invention
The invention provides a multiple phase-shifting control method, a device and a charger for a double-active full-bridge DC/DC converter, aiming at solving the technical problems, and the method, the device and the charger can ensure the realization effect of zero-voltage switches in a full range, thereby reducing the switching-on loss of a switching tube and improving the working efficiency of the converter.
The technical scheme adopted by the invention is as follows:
a multiple phase-shift control method of a double-active full-bridge DC/DC converter comprises a primary side voltage source, a primary side H-bridge unit, a transformer, a secondary side H-bridge unit and a secondary side voltage source, and comprises the following steps: determining to perform voltage reduction phase shift control or voltage boosting phase shift control according to the voltage value of the primary side voltage source, the voltage value of the secondary side voltage source and the transformation ratio of the transformer; and when the step-down phase shift control or the step-up phase shift control is carried out, switching a single phase shift state, a double phase shift state and a triple phase shift state according to the transmission power of the double-active full-bridge DC/DC converter and determining corresponding phase shift angles.
When the step-down phase shift control is carried out, the switched phase shift states comprise a single phase shift state, a first primary side double phase shift state, a second primary side double phase shift state, a third primary side double phase shift state and a first triple phase shift state; and when the boosting phase shift control is carried out, the switched phase shift states comprise a single phase shift state, a first secondary double phase shift state, a second secondary double phase shift state, a third secondary double phase shift state and a second triple phase shift state.
When the step-down phase-shift control is carried out, the zero-voltage switch is realized by controlling the internal phase-shift angle of the primary side; and when the boosting phase shift control is carried out, the zero-voltage switch is realized by controlling the phase angle in the secondary side.
A multiple phase-shift control device of a dual-active full-bridge DC/DC converter, the dual-active full-bridge DC/DC converter comprises a primary side voltage source, a primary side H-bridge unit, a transformer, a secondary side H-bridge unit and a secondary side voltage source, the multiple phase-shift control device comprises: the determining module is used for determining to perform voltage reduction phase shift control or voltage boosting phase shift control according to the voltage value of the primary side voltage source, the voltage value of the secondary side voltage source and the transformation ratio of the transformer; and the control module is used for switching a single phase-shifting state, a double phase-shifting state and a triple phase-shifting state according to the transmission power of the double-active full-bridge DC/DC converter and determining a corresponding phase shifting angle when the voltage reduction phase-shifting control or the voltage boost phase-shifting control is carried out.
When the control module performs the step-down phase-shift control, the switched phase-shift states include a single phase-shift state, a first primary side double phase-shift state, a second primary side double phase-shift state, a third primary side double phase-shift state and a first triple phase-shift state; when the control module performs the boost phase-shift control, the switched phase-shift states include a single phase-shift state, a first secondary double phase-shift state, a second secondary double phase-shift state, a third secondary double phase-shift state and a second triple phase-shift state.
When the control module performs the voltage reduction phase shift control, the control module controls a primary side internal phase shift angle to realize zero voltage switching; and when the control module performs the boosting phase-shifting control, the control module controls the internal phase-shifting angle of the secondary side to realize zero-voltage switching.
A charger comprises the multiple phase-shifting control device of the double-active full-bridge DC/DC converter.
The invention has the beneficial effects that:
when the voltage reduction phase shift control and the voltage boosting phase shift control are carried out, the single phase shift state, the double phase shift state and the triple phase shift state can be switched and the corresponding phase shift angle is determined, so that the realization effect of zero-voltage switching in the whole range can be ensured even under the condition that the voltage change range of the primary side voltage source and the secondary side voltage source is large, the switching-on loss of a switching tube can be reduced, and the working efficiency of the double-active full-bridge DC/DC converter can be improved.
Drawings
FIG. 1 is a schematic diagram of a dual active full-bridge DC/DC converter system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a dual active full-bridge DC/DC converter system according to an embodiment of the present invention;
FIG. 3 is a flowchart of a multiple phase shift control method of a dual active full bridge DC/DC converter according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating multiple phase shifting state switching according to an embodiment of the present invention;
FIG. 5 is a waveform diagram of converter operating voltage and current under single phase shift state during step-down phase shift control according to an embodiment of the present invention;
FIG. 6 is a waveform diagram of the converter operating voltage and current under the first primary side dual phase-shifting state during the step-down phase-shifting control according to an embodiment of the present invention;
FIG. 7 is a waveform diagram of converter operating voltage and current in the second primary dual phase-shifting state during step-down phase-shifting control according to an embodiment of the present invention;
FIG. 8 is a waveform diagram of converter operating voltage and current under the third primary-side dual phase-shifting state during step-down phase-shifting control according to an embodiment of the present invention;
FIG. 9 is a waveform diagram of converter operating voltage and current under the first triple phase-shifting state during the step-down phase-shifting control according to an embodiment of the present invention;
FIG. 10 is a waveform diagram of converter operating voltage and current under single phase shift during boost phase shift control according to an embodiment of the present invention;
FIG. 11 is a waveform diagram of converter operating voltage and current under the first secondary double phase-shifting state during the boost phase-shifting control according to an embodiment of the present invention;
FIG. 12 is a waveform diagram of the converter operating voltage and current under the second secondary side dual phase-shifting state during the step-up phase-shifting control according to an embodiment of the present invention;
FIG. 13 is a waveform diagram of converter operating voltage and current under the third secondary side dual phase-shifting state during the boost phase-shifting control according to an embodiment of the present invention;
FIG. 14 is a waveform diagram of converter operating voltage and current under a second triple phase-shift condition during boost phase-shift control according to an embodiment of the present invention;
FIG. 15 is a graph of different control state boundaries for a dual active full bridge DC/DC converter in accordance with an embodiment of the present invention;
fig. 16 is a block diagram of a multiple phase shift control device of a dual active full-bridge DC/DC converter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the dual-active full-bridge DC/DC converter system of the embodiment of the present invention includes a dual-active full-bridge DC/DC converter, an isolation driving amplifying circuit, and a DSP control circuit. The double-active full-bridge DC/DC converter comprises a primary side voltage source E 1 Secondary side voltage source E 2 And a full-bridge DC/DC conversion circuit consisting of the primary side H-bridge unit, the transformer T and the secondary side H-bridge unit. Wherein, the primary side H-bridge unit comprises four switching tubes (MOS tube is taken as an example in the figure), which are respectively S forming the first primary side bridge arm p1 、S p2 And S forming the second primary leg p3 、S p4 The secondary H-bridge unit comprises four switching tubes which are respectively S forming a first secondary bridge arm s1 、S s2 And S constituting the second secondary arm s3 、S s4 . One side of the two ends of the first primary side bridge arm and the second primary side bridge arm as a primary side H bridge unit is correspondingly connected to a primary side voltage source E 1 The middle node A of the first primary side bridge arm and the middle node B of the second primary side bridge arm are used as the other side of the primary side H bridge unit; two ends of the first secondary side bridge arm and the second secondary side bridge arm are used as one side of the secondary side H bridge unit and are correspondingly connected to a secondary side voltage source E 2 The middle node C of the first secondary bridge arm and the middle node D of the second secondary bridge arm are used as the other side of the secondary H bridge unit. Primary side voltage source E 1 And a secondary side voltage source E 2 And primary side filter capacitors C connected in parallel dc And secondary side filter capacitor C bus . A resonance capacitor C connected in series is also connected between the primary side of the transformer T and the intermediate node A 1 And an inductance L 1 A DC blocking capacitor C is connected between the secondary side of the transformer T and the node C 2 . The DSP control circuit can sample voltage and current signals of the double-active full-bridge DC/DC converter, eight independent PWM signals are sent through internal calculation, and signals P for driving four switching tubes of the primary side H-bridge unit are obtained after the eight independent PWM signals pass through the isolation driving amplification circuit 1 ～P 4 And a signal S for driving four switching tubes of the secondary H-bridge unit 1 ～S 4 Therefore, the control of the double-active full-bridge DC/DC converter is realized. The multiple phase-shifting control method of the dual-active full-bridge DC/DC converter provided by the embodiment of the invention is executed by the DSP control circuit, and the multiple phase-shifting control device of the dual-active full-bridge DC/DC converter provided by the embodiment of the invention is arranged in the DSP control circuit.
As shown in fig. 3, the multiple phase shift control method of the dual-active full-bridge DC/DC converter according to the embodiment of the present invention includes the following steps:
s1, performing voltage reduction phase shift control or voltage boosting phase shift control according to the voltage value of the primary side voltage source, the voltage value of the secondary side voltage source and the transformation ratio of the transformer.
And S2, when the step-down phase shift control or the step-up phase shift control is carried out, switching a single phase shift state, a double phase shift state and a triple phase shift state according to the transmission power of the double-active full-bridge DC/DC converter and determining corresponding phase shift angles.
In one embodiment of the present invention, the primary-secondary voltage transfer ratio K may be calculated according to equation (1):
wherein, V 1 Is a primary side voltage source E 1 Voltage value of V 2 As a secondary side voltage source E 2 N is the transformation ratio of the transformer T.
When K is less than or equal to 1, carrying out pressure reduction and phase shift control; when K is more than 1, the boosting phase shift control is carried out.
The phase shifting angle defined in the embodiment of the invention comprises: phase shift angle of primary and secondary side is
(i.e., the normalized phase shift angle between the first secondary leg relative to the first primary leg) and a primary internal phase shift angle of Dp (i.e., the normalized phase shift angle between the second primary leg relative to the first primary leg) and the secondary internal phase shift angle is Ds (i.e., the normalized phase shift angle between the second secondary leg relative to the first primary leg). When the voltage reduction phase shift control is carried out, the zero voltage switch is realized by controlling the internal phase shift angle of the primary side; when the boosting phase-shifting control is carried out, the zero-voltage switch is realized by controlling the internal phase-shifting angle of the secondary side.
In an embodiment of the present invention, as shown in fig. 4, when performing the step-down phase shift control, the switched phase shift states include a single phase shift state, a first primary side dual phase shift state, a second primary side dual phase shift state, a third primary side dual phase shift state, and a first triple phase shift state; when the boost phase-shift control is performed, the switched phase-shift states include a single phase-shift state, a first secondary double phase-shift state, a second secondary double phase-shift state, a third secondary double phase-shift state and a second triple phase-shift state.
In particular, assume a primary voltage source E 1 Is an input voltage V in Secondary side voltage source E 2 Is an output voltage V out The larger value of the double power supplies is V max (ii) a The switching frequency is f, the leakage inductance of the transformer T is L, and the output capacitance of the MOS tube is C oss Zero voltage vector left-right time is D 0 The step S2 includes:
when the step-down phase shift control is performed, when the transmission power is maximum, the dual-active full-bridge DC/DC converter is in a single phase shift state, and the operating voltage and current waveforms of the dual-active full-bridge DC/DC converter in this state are shown in fig. 5. Primary side t of transformer for voltage reduction and phase shift control 0 The current value at the moment is larger than t 1 The current value at the moment and the primary side are easy to realize zero voltage switching-on. Primary side current t of transformer 1 Phase shift angle between time and primary and secondary side
Is as in formula (2):
in order to achieve a zero-voltage switching effect, the required current value of the transformer T at the switching transition time must satisfy the following relation (3):
wherein, I r The current value of the real zero voltage switch.
When the transmission power is reduced in the single phase-shifting state, the phase shift angle of the primary side and the secondary side is reduced
Decrease of i L (t 1 ) When the current value can not meet the requirement of the formula (3), the first primary side dual phase shifting state is entered, the working waveform in the state is shown as figure 6, and the current | i in the state is L (t 0 )|≠|i L (t 1 ) And the calculation relationship is shown as formula (4):
the primary side internal phase shift angle is as in formula (5):
when the transmission power of the first primary side in the dual phase-shifting state is continuously reduced, the phase-shifting angle of the primary side and the secondary side
Reduced, in the primary side D p Increase when the phase angle of the primary side internal shift increases to satisfy the current i L (t 0 )|＝|i L (t 1 ) The phase-shift state of the second primary side is entered, the working waveform in the state is shown in FIG. 7, and the relation of the phase-shift in the primary side is shown in the formula(6)：
When | i L (t 0 )|＝|i L (t 1 ) After l, the relation can be forced to be always true, when the transmission power continues to decrease, the phase shift angle of the original secondary side
And after the phase difference is reduced to a negative value, the phase difference enters a third primary side double phase shifting state, the working waveform in the state is shown in fig. 8, and the calculation relationship of the primary side internal phase shifting angle is as shown in formula (7):
under the third original side phase-shifting dual phase-shifting state, as the transmission power is reduced, the phase-shifting angle of the original side and the secondary side follows
And continuously reducing, when the phase shift angle of the original secondary side meets the formula (8), entering a first triple phase shift state, wherein the working waveform in the state is shown in fig. 9, and the phase shift angle in the first triple phase shift state is calculated as the formula (8):
when the boost phase shift control is performed, when the transmission power is large, the dual-active full-bridge DC/DC converter is in a single phase shift state, and the operating waveform of the dual-active full-bridge DC/DC converter in this state is as shown in fig. 10. I during boost phase shift control L (t 0 )|≤|i L (t 1 ) L, transformer t 0 Current and phase shift angle of primary side at time
Is as in equation (9):
when the transmission power is gradually reduced, the phase shift angle
Reduced to fail to satisfy equation (10):
then enter the first secondary double phase-shifting state, in which the working waveform is shown in fig. 11, | i L (t 0 )|≠|i L (t 1 ) L. T in this state 0 The current value calculation expression at the time is as in formula (11):
obtaining the phase shift angle D of the secondary side according to the formula (10) and the formula (11) s As formula (12):
when the transmission power continues to decrease in the first-side double phase-shifted state,
decrease of D s Is increased so that i L (t 0 )|＝|i L (t 1 ) If the phase is shifted to the second secondary side, the working waveform in this state is shown in FIG. 12, and i is the state L (t 0 )|＝|i L (t 1 ) If the phase angle of the secondary side is the same as the formula (13):
under the condition of double phase shifting of the second secondary side, when the transmission power continues to be reduced, the phase shifting angle of the original secondary side
Decreasing from positive to negative, a third secondary double phase-shifting state is entered, in which the operating waveforms are as shown in FIG. 13, in which the current and secondary phase angles D are shifted inwards s As in equation (14):
under the third secondary side double phase-shifting state, when the transmission power is continuously reduced, the phase-shifting angle of the original secondary side is
Further decrease, a second triple phase-shifted state is entered, in which the operating waveform is shown in fig. 14, and the current is shown in formula (15):
the phase shift angle in the second triple-shifted state is calculated as in equation (16):
fig. 15 is a boundary graph of different control states of the dual-active full-bridge DC/DC converter according to an embodiment of the present invention, in which the left half is under buck phase shift control and the right half is under boost phase shift control, and states 0 to 8 are respectively under single-primary-side double-phase-shift state, first-primary-side double-phase-shift state, second-primary-side double-phase-shift state, third-primary-side double-phase-shift state, first triple-phase-shift state, first-secondary-side double-phase-shift state, second secondary-side double-phase-shift state, third-secondary-side double-phase-shift state, and second triple-phase-shift state.
According to the multiple phase-shifting control method of the double-active full-bridge DC/DC converter, when voltage reduction phase-shifting control and voltage boosting phase-shifting control are carried out, a single phase-shifting state, a double phase-shifting state and a triple phase-shifting state can be switched, and corresponding phase shifting angles are determined, so that even under the condition that the voltage change range of a primary side voltage source and a secondary side voltage source is large, the realization effect of zero-voltage switching in the whole range can be guaranteed, the switching tube opening loss can be reduced, and the working efficiency of the converter can be improved.
Corresponding to the multiple phase-shift control method of the dual-active full-bridge DC/DC converter of the above embodiment, the invention further provides a multiple phase-shift control device of the dual-active full-bridge DC/DC converter.
As shown in fig. 16, the multiple phase shift control device of the dual-active full-bridge DC/DC converter according to the embodiment of the present invention includes a determination module 10 and a control module 20. The determining module 10 is configured to determine to perform step-down phase shift control or step-up phase shift control according to a voltage value of the primary-side voltage source, a voltage value of the secondary-side voltage source, and a transformation ratio of the transformer; the control module 20 is configured to switch a single phase shift state, a double phase shift state, and a triple phase shift state according to the transmission power of the dual-active full-bridge DC/DC converter and determine a corresponding phase shift angle when performing buck phase shift control or boost phase shift control.
In an embodiment of the present invention, the determining module 10 may calculate the primary-secondary voltage transfer ratio K according to formula (1):
wherein, V 1 Is a primary side voltage source E 1 Voltage value of V 2 As a secondary side voltage source E 2 N is the transformation ratio of the transformer T.
The determining module 10 may determine to perform the step-down phase shift control when K is less than or equal to 1, and determine to perform the step-up phase shift control when K is greater than 1.
The phase shift angle defined in the embodiments of the present invention includes: phase shift angle of primary and secondary side is
(i.e., the normalized phase shift angle between the first secondary leg relative to the first primary leg) and a primary internal phase shift angle of D p (i.e., the normalized phase shift angle between the second primary leg relative to the first primary leg) and the phase shift angle in the secondary leg is D s (i.e., the normalized phase shift angle between the second secondary leg relative to the first primary leg). The control module 20 controls the phase angle of the primary side internal shift to realize zero voltage switching during the step-down phase shift control, and controls the phase angle of the secondary side internal shift to realize zero voltage switching during the step-up phase shift control.
In an embodiment of the present invention, as shown in fig. 4, when the control module 20 performs the step-down phase shift control, the switched phase shift states include a single phase shift state, a first primary side dual phase shift state, a second primary side dual phase shift state, a third primary side dual phase shift state, and a first triple phase shift state, and when performing the step-up phase shift control, the switched phase shift states include a single phase shift state, a first secondary side dual phase shift state, a second secondary side dual phase shift state, a third secondary side dual phase shift state, and a second triple phase shift state.
In particular, assume a primary voltage source E 1 Is an input voltage V in Secondary side voltage source E 2 Is an output voltage V out The larger value of the double power supply is V max (ii) a The switching frequency is f, the leakage inductance of the transformer T is L, and the output capacitance of the MOS tube is C oss Zero voltage vector left-right time is D 0 The control module 20 may control as follows:
when the step-down phase shift control is performed, when the transmission power is maximum, the dual-active full-bridge DC/DC converter is in a single phase shift state, and the operating voltage and current waveforms of the dual-active full-bridge DC/DC converter in this state are shown in fig. 5. Primary side t of transformer for voltage reduction and phase shift control 0 The current value at the moment is larger than t 1 The current value at the moment and the primary side are easy to realize zero voltage switching-on. Primary side current t of transformer 1 Phase shift angle between time and primary and secondary side
Is as in formula (2):
in order to achieve a zero-voltage switching effect, the required current value of the transformer T at the switching transition time must satisfy the following relation (3):
wherein, I r The current value of the real zero voltage switch.
When the transmission power is reduced in the single phase-shifting state, the phase shift angle of the primary side and the secondary side is reduced
Decrease i L (t 1 ) When the current value can not meet the requirement of the formula (3), the first primary side dual phase shifting state is entered, the working waveform in the state is shown as figure 6, and the current | i in the state is L (t 0 )|≠|i L (t 1 ) And the calculation relationship is shown as formula (4):
the primary side internal phase shift angle is as in formula (5):
when the transmission power of the first primary side in the dual phase-shifting state is continuously reduced, the phase-shifting angle of the primary side and the secondary side
Reduced, in the primary side D p Increase when the phase shift angle of the primary side increases to satisfy the current | i L (t 0 )|＝|i L (t 1 ) And entering a second primary side phase-shifting dual phase-shifting state, wherein the working waveform in the state is shown in fig. 7, and the relation of the phase shift in the primary side is shown in formula (6):
when | i L (t 0 )|＝|i L (t 1 ) After the power is decreased, the phase shift angle of the original secondary side can be forced to be always true
And after the phase difference is reduced to a negative value, the phase difference enters a third primary side double phase shifting state, the working waveform in the state is shown in fig. 8, and the calculation relationship of the primary side internal phase shifting angle is as shown in formula (7):
under the third primary side phase-shifting dual phase-shifting state, the phase-shifting angle of the primary and secondary sides follows the phase-shifting angle of the primary and secondary sides as the transmission power decreases
And continuously reducing, when the phase shift angle of the original secondary side meets the formula (8), entering a first triple phase shift state, wherein the working waveform in the state is shown in fig. 9, and the phase shift angle in the first triple phase shift state is calculated as the formula (8):
when the boost phase shift control is performed, when the transmission power is large, the dual-active full-bridge DC/DC converter is in a single phase shift state, and the operating waveform of the dual-active full-bridge DC/DC converter in this state is as shown in fig. 10. I during boost phase shift control L (t 0 )|≤|i L (t 1 ) L, transformer t 0 Current of primary side at timeAnd phase shift angle
Is as in equation (9):
when the transmission power is gradually reduced, the phase shift angle
Reduced to fail to satisfy equation (10):
then enter the first secondary double phase-shifting state, in which the working waveform is shown in fig. 11, | i L (t 0 )|≠|i L (t 1 ) L. T in this state 0 The current value calculation expression at the time is as in formula (11):
obtaining the phase shift angle D of the secondary side according to the formula (10) and the formula (11) s As in equation (12):
when the transmission power continues to decrease in the first-side double phase-shifted state,
decrease of D s Is increased so that i L (t 0 )|＝|i L (t 1 ) If the phase is shifted to the second secondary side, the operation waveform in this state is shown in FIG. 12, and i is L (t 0 )|＝|i L (t 1 ) If the phase angle of the secondary side is the same as the formula (13):
under the condition of double phase shifting of the second secondary side, when the transmission power continues to be reduced, the phase shifting angle of the original secondary side
Decreasing from positive to negative, a third secondary double phase-shifting state is entered, in which the operating waveforms are as shown in FIG. 13, in which the current and secondary phase-shifting angles D are set s As in equation (14):
under the third secondary side dual phase-shifting state, when the transmission power continues to decrease, the phase-shifting angle of the original secondary side
Further decrease, a second triple phase-shifted state is entered, in which the operating waveform is shown in fig. 14, and the current is shown in formula (15):
the phase shift angle in the second triple-shifted state is calculated as in equation (16):
fig. 15 is a boundary curve diagram of different control states of the dual-active full-bridge DC/DC converter according to the embodiment of the present invention, in which the left half is under buck phase shift control and the right half is under boost phase shift control, and states 0 to 8 are respectively under single-primary-side double-phase shift state, first-primary-side double-phase shift state, second-primary-side double-phase shift state, third-primary-side double-phase shift state, first triple-secondary-side double-phase shift state, second secondary-side double-phase shift state, third secondary-side double-phase shift state, and second triple-phase shift state.
According to the multiple phase-shift control device of the double-active full-bridge DC/DC converter, when voltage reduction phase-shift control and voltage boosting phase-shift control are carried out, a single phase-shift state, a double phase-shift state and a triple phase-shift state can be switched, and corresponding phase shift angles are determined, so that the realization effect of zero-voltage switching in the whole range can be ensured even under the condition that the voltage change range of a primary side voltage source and a secondary side voltage source is large, the switching tube opening loss can be reduced, and the working efficiency of the converter can be improved.
The invention also provides a charger corresponding to the multiple phase-shift control device of the double-active full-bridge DC/DC converter of the embodiment.
The charger according to the embodiment of the present invention includes the multiple phase shift control device of the dual-active full-bridge DC/DC converter according to the above embodiment of the present invention, and the specific implementation manner thereof may refer to the above embodiment.
According to the charger provided by the embodiment of the invention, the double-active full-bridge DC/DC converter has higher working efficiency and better performance.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The multiple phase-shifting control method of the double-active full-bridge DC/DC converter is characterized in that the double-active full-bridge DC/DC converter comprises a primary side voltage source, a primary side H-bridge unit, a transformer, a secondary side H-bridge unit and a secondary side voltage source, the primary side H-bridge unit comprises a first primary side bridge arm and a second primary side bridge arm, the secondary side H-bridge unit comprises a first secondary side bridge arm and a second secondary side bridge arm, and the multiple phase-shifting control method comprises the following steps:
determining to perform voltage reduction phase shift control or voltage boosting phase shift control according to the voltage value of the primary side voltage source, the voltage value of the secondary side voltage source and the transformation ratio of the transformer;
when the step-down phase shift control or the step-up phase shift control is performed, a single phase shift state, a double phase shift state and a triple phase shift state are switched according to the transmission power of the dual-active full-bridge DC/DC converter and corresponding phase shift angles are determined,
when the step-down phase shift control is carried out, the switched phase shift states comprise a single phase shift state, a first primary side double phase shift state, a second primary side double phase shift state, a third primary side double phase shift state and a first triple phase shift state; when the boosting phase shift control is performed, the switched phase shift states include a single phase shift state, a first secondary double phase shift state, a second secondary double phase shift state, a third secondary double phase shift state and a second triple phase shift state,
when the step-down phase-shift control is carried out, when the transmission power is maximum, the phase-shift control is in a single phase-shift state, when the transmission power in the single phase-shift state is reduced, the phase-shift angle of the original side and the secondary side is reduced, and when the transmission power in the single phase-shift state is reduced, the phase-shift angle of the original side and the secondary side is reduced
When the current value of the zero-voltage switch cannot be more than or equal to the current value of the zero-voltage switch, the first primary side dual phase-shifting state is entered, when the transmission power in the first primary side dual phase-shifting state is continuously reduced, the primary side phase-shifting angle and the secondary side phase-shifting angle are reduced, the primary side internal phase-shifting angle is increased, and when the primary side internal phase-shifting angle is increased to meet the requirement
Entering a second primary side dual phase-shifting state, when the transmission power is continuously reduced,the original secondary side phase shift angle is reduced to become a negative value and then enters a third original side dual phase shift state, the original secondary side phase shift angle is also continuously reduced along with the reduction of the transmission power in the third original side dual phase shift state, and when the original secondary side phase shift angle meets the formula
Then, entering a first triple phase-shifting state; when the boosting phase-shifting control is carried out, when the transmission power is maximum, the single phase-shifting state is adopted, and when the transmission power is gradually reduced, the phase-shifting angle of the original secondary side is reduced to a value which cannot meet the requirement
When the current value of the zero-voltage switch is more than or equal to the current value of the zero-voltage switch, the first secondary double phase-shifting state is entered, when the transmission power in the first secondary double phase-shifting state is continuously reduced, the phase shifting angle of the original secondary side is reduced, and the phase shifting angle in the secondary side is increased, so that the transmission power is enabled to be reduced, and the transmission power is enabled to be reduced
Then entering a second secondary double phase-shifting state, entering a third secondary double phase-shifting state when the transmission power is continuously reduced and the original secondary phase-shifting angle is reduced from a positive value to a negative value under the second secondary double phase-shifting state, entering a second triple phase-shifting state when the transmission power is continuously reduced and the original secondary phase-shifting angle is further reduced under the third secondary double phase-shifting state,
wherein the content of the first and second substances,t 0 which represents the initial moment of time of day,t 1 indicating the first switching moment from the initial moment,
the primary side current of the transformer at the first switching conversion time from the initial time,
is the primary current of the transformer at the initial moment,
is the phase shift angle of the original secondary side,fis the frequency of the switching of the switch,Lthe leakage inductance of the transformer is obtained,V max for larger values of the voltages of the primary and secondary voltage sources,V out is the voltage of the secondary side voltage source,nis the transformation ratio of the transformer and is,
for the output capacitance of the switch tube in the converter,
wherein, the phase shift angle corresponding to the single phase shift state is the original secondary phase shift angle, the phase shift angles corresponding to the first primary side double phase shift state, the second primary side double phase shift state and the third primary side double phase shift state are primary side internal shift angles, the phase shift angles corresponding to the first triple phase shift state are the original secondary side phase shift angle, the primary side internal shift angle and the secondary side internal shift angle, the phase shift angles corresponding to the first secondary side double phase shift state, the second secondary side double phase shift state and the third secondary side double phase shift state are secondary side internal shift angles, the phase shift angles corresponding to the second triple phase shift state are the original secondary side phase shift angle, the primary side internal shift angle and the secondary side internal shift angle,
the original secondary side phase shift angle is a normalized phase shift angle between the first secondary side bridge arm and the first primary side bridge arm, the primary side internal phase shift angle is a normalized phase shift angle between the second primary side bridge arm and the first primary side bridge arm, and the secondary side internal phase shift angle is a normalized phase shift angle between the second secondary side bridge arm and the first primary side bridge arm.
2. The multiple phase-shifting control method of a dual-active full-bridge DC/DC converter according to claim 1, wherein during the step-down phase-shifting control, a zero-voltage switch is realized by controlling a primary side internal phase-shifting angle; and when the boosting phase-shifting control is carried out, the zero-voltage switch is realized by controlling the internal phase-shifting angle of the secondary side.
3. The utility model provides a double-active full-bridge DC/DC converter's multiple phase-shifting controlling means, its characterized in that, double-active full-bridge DC/DC converter includes primary voltage source, primary H bridge unit, transformer, vice limit H bridge unit and vice limit voltage source, and primary H bridge unit includes first primary bridge arm and second primary bridge arm, and vice limit H bridge unit includes first vice limit bridge arm and second vice limit bridge arm, multiple phase-shifting controlling means includes:
the determining module is used for determining to perform voltage reduction phase shift control or voltage boosting phase shift control according to the voltage value of the primary side voltage source, the voltage value of the secondary side voltage source and the transformation ratio of the transformer;
a control module for switching a single phase-shift state, a double phase-shift state and a triple phase-shift state according to the transmission power of the dual-active full-bridge DC/DC converter and determining a corresponding phase-shift angle when performing the buck phase-shift control or the boost phase-shift control,
when the control module performs the voltage reduction phase shift control, the switched phase shift states comprise a single phase shift state, a first primary side double phase shift state, a second primary side double phase shift state, a third primary side double phase shift state and a first triple phase shift state; when the control module performs the boost phase-shift control, the switched phase-shift states include a single phase-shift state, a first secondary double phase-shift state, a second secondary double phase-shift state, a third secondary double phase-shift state and a second triple phase-shift state,
when the step-down phase-shift control is carried out, when the transmission power is maximum, the single phase-shift state is adopted, when the transmission power under the single phase-shift state is reduced, the phase shift angle of the original secondary side is reduced, and when the transmission power under the single phase-shift state is reduced, the phase shift angle of the original secondary side is reduced
When the current value of the zero-voltage switch cannot be more than or equal to the current value of the zero-voltage switch, the first primary side dual phase-shifting state is entered, when the transmission power in the first primary side dual phase-shifting state is continuously reduced, the primary side phase-shifting angle and the secondary side phase-shifting angle are reduced, the primary side internal phase-shifting angle is increased, and when the primary side internal phase-shifting angle is increased to meet the requirement
Entering a second primary side dual phase-shifting state when the transmission power continues to decreaseWhen the phase shift angle of the original secondary side is reduced to become a negative value, the phase shift angle of the original secondary side enters a third original-side dual phase shift state, and in the third original-side dual phase shift state, along with the reduction of the transmission power, the phase shift angle of the original secondary side is also reduced continuously, and when the phase shift angle of the original secondary side meets the formula
Then, entering a first triple phase-shifting state; when the boosting phase-shifting control is carried out, when the transmission power is maximum, the single phase-shifting state is realized, and when the transmission power is gradually reduced, the phase-shifting angle of the original secondary side is reduced to a value which cannot meet the requirement
When the current value of the zero voltage switch is more than or equal to the current value of the zero voltage switch, the first secondary side dual phase-shifting state is entered, when the transmission power is continuously reduced under the first secondary side dual phase-shifting state, the original secondary side phase-shifting angle is reduced, and the secondary side phase-shifting angle is increased, so that the transmission power is reduced, and the transmission power is increased
Then entering a second secondary double phase-shifting state, entering a third secondary double phase-shifting state when the transmission power is continuously reduced and the original secondary phase-shifting angle is reduced from a positive value to a negative value under the second secondary double phase-shifting state, entering a second triple phase-shifting state when the transmission power is continuously reduced and the original secondary phase-shifting angle is further reduced under the third secondary double phase-shifting state,
wherein the content of the first and second substances,t 0 which represents the initial moment of time of day,t 1 indicating the first switching moment from the initial moment,
the primary side current of the transformer at the first switching conversion time from the initial time,
is the primary current of the transformer at the initial moment,
is a phase shift angle of the original secondary side,fin order to be able to switch the frequency,Lthe leakage inductance of the transformer is obtained,V max for larger values of the voltages of the primary and secondary voltage sources,V out is the voltage of the secondary side voltage source,nis the transformation ratio of the transformer and is,
for the output capacitance of the switch tube in the converter,
wherein, the phase shift angle corresponding to the single phase shift state is the original secondary phase shift angle, the phase shift angles corresponding to the first primary side double phase shift state, the second primary side double phase shift state and the third primary side double phase shift state are primary side internal shift angles, the phase shift angles corresponding to the first triple phase shift state are the original secondary side phase shift angle, the primary side internal shift angle and the secondary side internal shift angle, the phase shift angles corresponding to the first secondary side double phase shift state, the second secondary side double phase shift state and the third secondary side double phase shift state are secondary side internal shift angles, the phase shift angles corresponding to the second triple phase shift state are the original secondary side phase shift angle, the primary side internal shift angle and the secondary side internal shift angle,
the original secondary side phase shift angle is a normalized phase shift angle between the first secondary side bridge arm and the first primary side bridge arm, the primary side internal phase shift angle is a normalized phase shift angle between the second primary side bridge arm and the first primary side bridge arm, and the secondary side internal phase shift angle is a normalized phase shift angle between the second secondary side bridge arm and the first primary side bridge arm.
4. The multiple phase-shift control device for the dual-active full-bridge DC/DC converter according to claim 3, wherein the control module controls a primary side internal phase-shift angle to realize zero-voltage switching during the step-down phase-shift control; and when the control module performs the boosting phase-shifting control, the zero-voltage switch is realized by controlling the internal phase-shifting angle of the secondary side.
5. Charger characterized by comprising the multiple phase shift control device of a dual active full bridge DC/DC converter according to claim 3 or 4.
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