CN115514217A - Power converter control method, system and device and power converter - Google Patents

Power converter control method, system and device and power converter Download PDF

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Publication number
CN115514217A
CN115514217A CN202211265873.6A CN202211265873A CN115514217A CN 115514217 A CN115514217 A CN 115514217A CN 202211265873 A CN202211265873 A CN 202211265873A CN 115514217 A CN115514217 A CN 115514217A
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switch
end switch
unit
voltage reduction
capacitor
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CN202211265873.6A
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CN115514217B (en
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陈烨楠
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ZJU Hangzhou Global Scientific and Technological Innovation Center
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ZJU Hangzhou Global Scientific and Technological Innovation Center
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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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a power converter control method, a system, a device and a power converter, and relates to the technical field of power electronics, wherein a switch capacitor unit and a voltage reduction unit are arranged in the power converter, a first front-end switch and a second front-end switch are arranged in the switch capacitor unit, through the control of each switch, when the second front-end switch and a second rear-end switch are simultaneously conducted, the two switches can be shunted, the current of each switch is reduced, and the withstand voltage is reduced, so that the conduction loss of each switch is reduced.

Description

Power converter control method, system and device and power converter
Technical Field
The present invention relates to the field of power electronics technologies, and in particular, to a power converter control method, system, device, and power converter.
Background
In order to supply power to a Central Processing Unit (CPU), a Graphic Processing Unit (GPU) and other similar power consuming devices, a power converter is usually used to convert a voltage into a voltage required by the power consuming devices, and the structure of the prior art power converter is shown in fig. 1, where fig. 1 is a schematic structural diagram of the prior art power converter. V in FIG. 1 HIGH Is a high-pressure port, V LOW For low-voltage port, by controlling two switches S 1 And S 2 Can realize V by periodically switching on and off HIGH To V LOW The conversion of (a), it can be seen,S 1 、S 2 and the inductor form a voltage reduction unit. Specifically, let the switching period be T s Within one cycle S 1 The time of conduction is DT s ，S 2 The conduction time is (1-D) T s Then V is LOW ＝DV HIGH (generally, D is the duty cycle) if V HIGH Is 12V, V LOW And D is 1/12 if the voltage is 1V.
The required output power increases when the number of power consuming devices increases, and in order to meet the power demand of more power consuming devices, the voltage of the high voltage port is usually selected to be increased, for example, from 12V to 48V, but when the voltage of the high voltage port increases, S in fig. 1 1 And S 2 The withstand voltage of (2) is increased to 48V, and the conduction loss of the switch is increased correspondingly.
In order to reduce the loss in the circuit in the prior art, a series circuit of a multiphase converter is provided, as shown in fig. 2a, fig. 2b and fig. 2c, fig. 2a is a schematic diagram of a two-phase series capacitive power converter in the prior art, fig. 2b is a schematic diagram of a four-phase series capacitive power converter in the prior art, and fig. 2c is a schematic diagram of a six-phase series capacitive power converter in the prior art. Taking two phases as an example, the upper tube S in FIG. 2a H1 Lower tube S L1 Capacitor C S1 And an inductance L 1 The pressure reduction unit is composed of an upper tube S H2 Lower tube S L2 And an inductance L 2 The voltage reduction unit is formed by adding a capacitor C in the voltage reduction unit S1 And the input of the two-phase power converter is connected in series and the output of the two-phase power converter is connected in parallel, wherein fig. 3 is a schematic diagram of a driving signal of a two-phase series capacitor power converter in the prior art, and a capacitor C is used in stable operation S1 Has a voltage of V HIGH /2. Fig. 4a, 4b, 4c and 4d show four stages in a cycle, where fig. 4a is a schematic diagram of a two-phase series capacitor buck converter in the prior art at a first stage, fig. 4b is a schematic diagram of a two-phase series capacitor buck converter in the prior art at a second stage, fig. 4c is a schematic diagram of a two-phase series capacitor buck converter in the prior art at a third stage, and fig. 4d is a schematic diagram of a two-phase series capacitor buck converter in the prior art at a fourth stageIntention is. In a first stage S H1 Conducting current to C through the high voltage port S1 And then L 1 To the low pressure port and L 2 ，C S1 Energy storage, inductance L 1 Voltage at both ends is V HIGH -V HIGH /2-V LOW ＝V HIGH /2-V LOW Inductance L 2 The voltage at both ends is-V LOW (ii) a In a second phase, two lower tubes S L1 And S L2 Conducting current through ground to L 1 And L 2 To V LOW The voltage at both ends of the two inductors is-V LOW (ii) a In a third stage S H2 And S L1 Conduction, C S1 Discharging the stored electric energy in the first stage, the current passing through the ground S L1 To C S1 Then, the second warp S H2 To L 2 And also a current flows from ground S L1 To L 1 Then to V LOW Inductance L 1 The voltage at both ends is-V LOW Inductance L 2 Voltage at both ends is V HIGH /2-V LOW (ii) a The fourth stage is similar to the second stage. It can be seen that S is present in the whole process H1 、S L1 And S L2 All endured voltages are only V HIGH In the first stage, S H2 Has a withstand voltage of V HIGH . But in the third stage, S L1 Two paths of current flow upwards, and the conduction loss is I 2 R is known as S L1 The conduction loss at the third stage is four times that of the conventional power converter down tube. In addition, in the prior art, a multi-phase series capacitor power converter may be provided, specifically, referring to fig. 2b and fig. 2c, the lower tube in each power converter needs to bear twice current in a certain stage, and the more the power converters are connected in series, the current doubling phenomenon may cause the conduction loss of the switch to be increased sharply when a large current is output.
Therefore, in the prior art, although partial loss in a circuit can be reduced, a large switch conduction loss still exists, and therefore how to solve the conduction loss of the switch in the circuit is a problem to be solved in the art.
Disclosure of Invention
The invention aims to provide a power converter control method, a system, a device and a power converter, wherein a switch capacitor unit and a voltage reduction unit are arranged in the power converter, a first front-end switch and a second front-end switch are arranged in the switch capacitor unit, through the control of each switch, when the second front-end switch and the second rear-end switch are simultaneously conducted, the two switches can be shunted, the current of each switch is reduced, the withstand voltage is reduced, and thus the conduction loss of each switch is reduced.
In order to solve the technical problem, the invention provides a power converter control method, which is applied to a power converter, wherein the power converter comprises N switch capacitor units and N voltage reduction units, and each switch capacitor unit and each voltage reduction unit are respectively connected in a one-to-one correspondence manner; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; a second end of the first front-end switch in the same switched capacitor unit is connected with the front-end capacitor, the front-end capacitor is connected with a first end of the second front-end switch, and a second end of the second front-end switch is grounded; a second end of the first rear-end switch in the same voltage reduction unit is connected with a first end of the second rear-end switch and a first end of the first rear-end inductor, a second end of the second rear-end switch is grounded, and a second end of the first rear-end inductor is connected with a low-voltage port; a second end of the second front-end switch in the switched capacitor unit is connected with a first end of the first back-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of the first front-end switch in a first one of the switched capacitor units is connected to a high-voltage port, and a first end of the first front-end switch in an ith one of the switched capacitor units is connected to a second end of the first front-end switch in an (i-1) th one of the switched capacitor units; n and i are positive integers, i is more than 1 and less than or equal to N;
the method comprises the following steps:
controlling the first front-end switch and the second front-end switch in the same switched capacitor unit to be respectively conducted for preset time in the first half of the conducting period or the second half of the conducting period, and enabling the first front-end switch in the jth switched capacitor unit and the second front-end switch in the kth switched capacitor unit to synchronously act; j and k are positive integers, j is an odd number less than or equal to N, and k is an even number less than or equal to N;
controlling the first rear-end switch in each voltage reduction unit to be conducted when the first front-end switch in the corresponding switched capacitor unit is conducted, wherein the conduction time is the product of a preset duty ratio and the conduction period, and the conduction time is less than the preset time;
and controlling the second back-end switches in the voltage reduction units to be switched on when the corresponding first back-end switches are switched off.
Preferably, the controlling the first back-end switch in each voltage-reducing unit to be turned on when the first front-end switch in the corresponding switched capacitor unit is turned on includes:
and controlling the first rear end switch in each voltage reduction unit to be switched on when the corresponding first front end switch in the switched capacitor unit is switched on, and controlling the first rear end switch in each voltage reduction unit to be switched on synchronously, in a staggered way or in a disorder way.
Preferably, the second end of the first front-end switch of the N-1 th switched capacitor unit is connected to the first end of the first back-end switch of the nth buck unit.
Preferably, a first end of the first back-end switch in the voltage-reducing unit is a first end of the voltage-reducing unit, and a second end of the first back-end inductor is a second end of the voltage-reducing unit;
each voltage reduction unit is respectively connected with a plurality of voltage reduction units in parallel, the first ends of the voltage reduction units connected in parallel are connected, and the second ends of the voltage reduction units connected in parallel are connected;
controlling the first back-end switch in each voltage-reducing unit to be turned on when the first front-end switch in the corresponding switched capacitor unit is turned on, including:
and controlling the first rear end switches in the voltage reduction units to be switched on when the corresponding first front end switches in the switched capacitor units are switched on, and controlling the first rear end switches in the voltage reduction units connected in parallel to be switched on synchronously, in a staggered way or in an unordered way.
In order to solve the above technical problem, the present invention provides a power converter control system, which is applied to a power converter, where the power converter includes N switched capacitor units and N voltage reduction units, and each switched capacitor unit and each voltage reduction unit are connected in a one-to-one correspondence manner; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; a second end of the first front-end switch in the same switched capacitor unit is connected with the front-end capacitor, the front-end capacitor is connected with a first end of the second front-end switch, and a second end of the second front-end switch is grounded; a second end of the first back-end switch in the same voltage reduction unit is connected with a first end of the second back-end switch and a first end of the first back-end inductor, a second end of the second back-end switch is grounded, and a second end of the first back-end inductor is connected with a low-voltage port; a second end of the second front-end switch in the switched capacitor unit is connected with a first end of the first back-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of the first front-end switch in a first one of the switched capacitor units is connected to a high-voltage port, and a first end of the first front-end switch in an ith one of the switched capacitor units is connected to a second end of the first front-end switch in an (i-1) th one of the switched capacitor units; n and i are positive integers, i is more than 1 and less than or equal to N;
the system comprises:
the first control unit is used for controlling the first front-end switch and the second front-end switch in the same switched capacitor unit to be respectively conducted for preset time in the first half of the conducting period or the second half of the conducting period, and the first front-end switch in the jth switched capacitor unit and the second front-end switch in the kth switched capacitor unit synchronously act; j and k are positive integers, j is an odd number less than or equal to N, and k is an even number less than or equal to N;
the second control unit is used for controlling the first rear-end switch in each voltage reduction unit to be conducted when the corresponding first front-end switch in the switched capacitor unit is conducted, the conducting time is the product of a preset duty ratio and the conducting period, and the conducting time is shorter than the preset time;
and the third control unit is used for controlling the second rear-end switch in each voltage reduction unit to be switched on when the corresponding first rear-end switch is switched off.
To solve the above technical problem, the present invention provides a power converter control apparatus, including:
a memory for storing a computer program;
a processor for implementing the steps of the power converter control method as described above when executing the computer program.
To solve the technical problem, the present invention provides a computer-readable storage medium having a computer program stored thereon, the computer program, when being executed by a processor, implementing the steps of the power converter control method as described above.
In order to solve the above technical problem, the present invention provides a power converter, which includes N switched capacitor units and N voltage reduction units;
each switch capacitor unit is connected with each voltage reduction unit in a one-to-one corresponding mode; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; a second end of the first front-end switch in the same switched capacitor unit is connected with the front-end capacitor, the front-end capacitor is connected with a first end of the second front-end switch, and a second end of the second front-end switch is grounded; a second end of the first rear-end switch in the same voltage reduction unit is connected with a first end of the second rear-end switch and a first end of the first rear-end inductor, a second end of the second rear-end switch is grounded, and a second end of the first rear-end inductor is connected with a low-voltage port; a second end of the second front-end switch in the switched capacitor unit is connected with a first end of the first back-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of the first front-end switch in a first one of the switched capacitor units is connected to a high-voltage port, and a first end of the first front-end switch in an ith one of the switched capacitor units is connected to a second end of the first front-end switch in an (i-1) th one of the switched capacitor units; n and i are positive integers, and i is more than 1 and less than or equal to N.
Preferably, a first end of the first back-end switch in the voltage-reducing unit is a first end of the voltage-reducing unit, and a second end of the first back-end inductor is a second end of the voltage-reducing unit;
each voltage reduction unit is respectively connected with a plurality of voltage reduction units in parallel, the first ends of the voltage reduction units connected in parallel are connected, and the second ends of the voltage reduction units connected in parallel are connected.
Preferably, the voltage reducing unit further includes a third back-end switch, a fourth back-end switch, a second back-end inductor, and a back-end capacitor;
the rear-end capacitor is arranged between the first rear-end switch and the second rear-end switch; a first end of the third back-end switch is connected with a second end of the first back-end switch, and a second end of the third back-end switch is connected with a first end of the second back-end inductor and a first end of the fourth back-end switch; a second end of the fourth back-end switch is grounded; the second end of the second back-end inductor is connected with the second end of the first back-end inductor.
The application provides a power converter control method, a system, a device and a power converter, and relates to the technical field of power electronics, wherein a switched capacitor unit and a voltage reduction unit are arranged in the power converter, a first front end switch and a second front end switch are arranged in the switched capacitor unit, through the control of each switch, when the second front end switch and a second rear end switch are simultaneously switched on, the two switches can be shunted, the current of each switch is reduced, the voltage resistance is reduced, and therefore the conduction loss of each switch is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art power converter;
FIG. 2a is a schematic diagram of a two-phase series capacitor power converter according to the prior art;
FIG. 2b is a schematic diagram of a four-phase series capacitor power converter according to the prior art;
FIG. 2c is a schematic diagram of a six-phase series capacitor power converter according to the prior art;
FIG. 3 is a schematic diagram of driving signals of a two-phase series capacitor power converter of the prior art;
FIG. 4a is a schematic diagram of a two-phase series capacitor buck converter in the prior art at a first stage;
FIG. 4b is a schematic diagram of a two-phase series capacitor buck converter in the second stage according to the prior art;
FIG. 4c is a schematic diagram of a two-phase series capacitor buck converter in the third stage according to the prior art;
FIG. 4d is a schematic diagram of a two-phase series capacitor buck converter in the fourth stage according to the prior art;
FIG. 5 is a flow chart illustrating a method for controlling a power converter according to the present invention;
fig. 6 is a schematic structural diagram of an N-phase power converter according to the present invention;
FIG. 7 is a schematic diagram of a two-phase power converter according to the present invention;
FIG. 8 is a schematic diagram of control signals for a two-phase power converter according to the present invention;
FIG. 9 is a simplified schematic diagram of a two-phase power converter according to the present invention;
FIG. 10a is a schematic diagram of a two-phase power converter of the present invention at a first stage;
FIG. 10b is a schematic diagram of the two-phase power converter of the present invention at the second stage;
FIG. 10c is a schematic diagram of a two-phase power converter of the present invention at a third stage;
FIG. 10d is a schematic diagram of the two-phase power converter of the present invention at a fourth stage;
fig. 11 is a schematic structural diagram of a four-phase power converter according to the present invention;
FIG. 12 is a schematic diagram of a six-phase power converter according to the present invention;
fig. 13a is a schematic diagram of control signals for synchronous control of a first six-phase power converter provided in the present invention;
FIG. 13b is a schematic diagram of control signals for synchronous control of a second six-phase power converter according to the present invention;
FIG. 14a is a schematic diagram of a six-phase power converter of the present application during a first phase of operation;
FIG. 14b is a schematic diagram of the six-phase power converter of the present application during a second phase of operation;
FIG. 15a is a schematic diagram of control signals for asynchronous control of a first six-phase power converter according to the present invention;
FIG. 15b is a schematic diagram of control signals for asynchronous control of a second six-phase power converter according to the present invention;
FIG. 16 is a schematic diagram of a power converter with multiple buck units connected in parallel according to the present invention;
FIG. 17a is a schematic diagram of control signals for interleaved control of a two-phase power converter with multiple buck units connected in parallel according to the present invention;
FIG. 17b is a schematic diagram of control signals for out-of-order control of two-phase power converters with multiple buck units connected in parallel according to the present invention;
FIG. 18 is a schematic diagram of a power converter control system according to the present invention;
fig. 19 is a schematic structural diagram of a power converter control apparatus according to the present invention;
fig. 20 is a schematic structural diagram of another voltage reduction unit provided by the present invention.
Detailed Description
The core of the invention is to provide a power converter control method, a system, a device and a power converter, wherein a switch capacitor unit and a voltage reduction unit are arranged in the power converter, a first front-end switch and a second front-end switch are arranged in the switch capacitor unit, and through the control of each switch, when the second front-end switch and the second rear-end switch are simultaneously conducted, the two switches can be shunted, the current of each switch is reduced, and the withstand voltage is reduced, so that the conduction loss of each switch is reduced.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 5, fig. 5 is a schematic flow chart of a method for controlling a power converter according to the present invention, where the method is applied to the power converter, the power converter includes N switched capacitor units and N voltage dropping units, and each switched capacitor unit and each voltage dropping unit are connected in a one-to-one correspondence manner; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; the second end of a first front-end switch in the same switched capacitor unit is connected with a front-end capacitor, the front-end capacitor is connected with the first end of a second front-end switch, and the second end of the second front-end switch is grounded; the second end of the first back-end switch in the same voltage reduction unit is connected with the first end of the second back-end switch and the first end of the first back-end inductor, the second end of the second back-end switch is grounded, and the second end of the first back-end inductor is connected with the low-voltage port; the second end of a second front-end switch in the switched capacitor unit is connected with the first end of a first rear-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of a first front-end switch in the first switched capacitor unit is connected with the high-voltage port, and a first end of a first front-end switch in the ith switched capacitor unit is connected with a second end of the first front-end switch in the (i-1) th switched capacitor unit; n and i are positive integers, i is more than 1 and less than or equal to N;
the method comprises the following steps:
s11: controlling a first front-end switch and a second front-end switch in the same switched capacitor unit to be respectively conducted for preset time in the first half conduction period or the second half conduction period of one conduction period, and enabling the first front-end switch in the jth switched capacitor unit and the second front-end switch in the kth switched capacitor unit to synchronously act; j and k are positive integers, j is an odd number less than or equal to N, and k is an even number less than or equal to N;
in view of the fact that in the power converter in the prior art, although bus loss in the circuit can be reduced, conduction loss of a switch in the circuit is still large, in order to solve the above technical problem, in this embodiment, when designing the power converter, taking an N-phase power converter as an example, please refer to fig. 6, and fig. 6 is a schematic structural diagram of an N-phase power converter provided by the present invention, where N switched capacitor units and N buck units are provided, and a lower tube in the N switched capacitor units and a lower tube in the buck unit are not multiplexed, that is, a second front-end switch is provided in the switched capacitor unit, and a second back-end switch is provided in the buck unit, so that shunting of the second front-end switch and the second back-end switch can be realized by controlling switches in the circuit to reduce conduction loss of the second front-end switch and the second back-end switch.
Specifically, when the switches are controlled, the first front-end switch and the second front-end switch in the same switched capacitor unit are respectively turned on in different half periods in the same period, for example, the first front-end switch is turned on in the first half period, and the second front-end switch is turned on in the second half period. Of course, the preset time is not longer than the time of half of the conduction period, and the user can set the preset time according to the requirement on the output voltage.
Based on this, the power can be supplied by the high-voltage port within the preset time when the first front-end switch is switched on, the high-voltage power of the high-voltage port is reduced in voltage and output, and the front-end capacitor is charged at the same time, the power is supplied by the front-end capacitor within the preset time when the second front-end switch is switched on, the voltage of the front-end capacitor is reduced in voltage and output, and the voltage when the front-end capacitor in the mth switched capacitor unit stably operates is (N-m) V HIGH N, wherein V HIGH Is the input voltage of the high voltage port. Therefore, the withstand voltage of the first front-end switch and the first back-end switch in the switched capacitor unit can be reduced, and the conduction loss of the switches is reduced.
In addition, S in fig. 6 1A Is a first front-end switch, C, in a first switched-capacitor unit 1S Is the front-end capacitance, S, in the first switched-capacitor unit 1B For the second front-end switch, S, of the first switched-capacitor unit NA Is the first front-end switch in the Nth switched-capacitor unit, C NS Is the front-end capacitance, S, in the Nth switched-capacitor unit NB For the second front-end switch, S, in the Nth switched-capacitor unit 1H Is a first back-end switch in a first buck unit, L 1L Is a first back-end inductance in the first voltage-reducing unit, S 1L For the second back-end switch, S, in the first buck unit NH Is the first back-end switch, L, in the Nth voltage-reducing unit NL Is a first back-end inductance in the Nth voltage-reducing unit, S NL Is a second back-end switch in the nth buck unit.
S12: controlling the first rear end switch in each voltage reduction unit to be conducted when the first front end switch in the corresponding switched capacitor unit is conducted, wherein the conduction time is the product of a preset duty ratio and a conduction period, and the conduction time is less than the preset time;
when the switch in the voltage reduction unit is controlled, specifically, if the first front end switch in the switched capacitor unit connected to the voltage reduction unit is turned on, the first rear end switch in the voltage reduction unit is controlled to be turned on within a preset time period in which the first front end switch is turned on, so as to implement voltage reduction output of high voltage in the high voltage port, and furthermore, the turn-on time is a product of a preset duty ratio and a turn-on period, based on which, the output voltage is an expected voltage, and the preset duty ratio is also a duty ratio set based on the expected voltage.
S13: and controlling the second back-end switches in the voltage reduction units to be switched on when the corresponding first back-end switches are switched off.
When the second rear end switch in the voltage reduction unit is controlled, if the first rear end switch in the voltage reduction unit is disconnected, the second rear end switch is closed, namely, the control signals of the first rear end switch and the second rear end switch in the same voltage reduction unit are complementary, and on the basis, when the second front end switch is switched on, the second rear end switch is also in a conducting state, so that shunting of the second rear end switch and the second front end switch can be ensured, and the conduction loss of the lower tube is reduced.
Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of a two-phase power converter according to the present invention, and fig. 8 is a schematic control signal diagram of a two-phase power converter according to the present invention, where V is GSA Is a pair of S NA Control signal of V GSB Is a pair of S NB Control signal of V GS1H Is a pair of S 1H Control signal of V GS1L Is a pair of S 1L Control signal of V GS2H Is a pair of S 2H Control signal of V GS2L Is a pair of S 2L The control signal of (2). It can be seen that the first front-end switch in the first switched-capacitor unit is turned on during the first half of a conduction period, and the second front-end switch in the second switched-capacitor unit is turned on during the first half of a conduction period. In the first switched capacitor unit, the first back end switch in the first voltage reduction unit is conducted in a half period of the conduction of the first front end switchAnd the on-time is DT S Where D is a preset duty cycle and T is S For the on period, after the first back end switch is disconnected, the second back end switch is connected, and when the second back end switch is stably operated, the voltage of the front end capacitor in the first switched capacitor unit is V HIGH And/2, the voltage of the front-end capacitor in the second switched capacitor unit is 0, so that the circuit structure can be simplified to fig. 9. Referring to fig. 9, fig. 9 is a simplified structural schematic diagram of a two-phase power converter according to the present invention. Referring to fig. 10a, fig. 10b, fig. 10c and fig. 10d, fig. 10a is a schematic diagram of a two-phase power converter of the present invention at a first stage, fig. 10b is a schematic diagram of a two-phase power converter of the present invention at a second stage, fig. 10c is a schematic diagram of a two-phase power converter of the present invention at a third stage, and fig. 10d is a schematic diagram of a two-phase power converter of the present invention at a fourth stage. In the first stage, the first front-end switch in the first switched capacitor unit is turned on, the first back-end switch in the first buck unit is turned on, the second back-end switch in the second buck unit is turned on, and at this time, the voltage across the first back-end inductor in the first buck unit is V HIGH -V HIGH /2-V LOW ＝V HIGH /2-V LOW ，V LOW The voltage of the low-voltage port is-V at the two ends of the first back-end inductor in the second voltage reduction unit LOW (ii) a In the second stage, two second back-end switches in the two switched capacitor units are conducted, and the voltages of the two first back-end inductors are both-V LOW In practice, the first front-end switch in the first switched-capacitor unit and the second front-end switch in the second switched-capacitor unit may be turned off at this time; in the third stage, the first front-end switch in the first switched capacitor unit is turned off, the second front-end switch is turned on, the first back-end switch in the first buck unit is turned off, the second back-end switch is turned on, the first back-end switch in the second buck unit is turned on, the second back-end switch is turned off, and the voltage across the first back-end inductor in the first buck unit is-V LOW The voltage across the first back-end inductor in the second voltage-reducing unit is V HIGH /2-V LOW The current path is ground-the first back end circuit in the first voltage reduction unitfeeling-V LOW And ground-the front-end capacitor in the first switched-capacitor unit-the first back-end inductor in the second buck unit-V LOW Compared with the third stage in fig. 4c, it can be seen that, in the present application, the second front-end switch in the first switched capacitor unit and the second back-end switch in the first voltage-reducing unit respectively flow through one current, so as to reduce the conduction loss of the lower tube; the fourth stage is similar to the second stage and will not be described herein. It can be seen that the withstand voltage of the first back-end switch in the first buck unit, the second back-end switch and the second back-end switch in the second buck unit is equal to V HIGH /2, the withstand voltage of the first back-end switch in the second voltage-reducing unit is equal to V HIGH 。
To further facilitate understanding, please refer to fig. 11 and 12, in which fig. 11 is a schematic structural diagram of a four-phase power converter provided by the present invention, and fig. 12 is a schematic structural diagram of a six-phase power converter provided by the present invention.
Referring to fig. 13a and 13b, fig. 13a is a schematic diagram of a control signal for synchronous control of a first six-phase power converter provided by the present invention, and fig. 13b is a schematic diagram of a control signal for synchronous control of a second six-phase power converter provided by the present invention. Wherein S 1H 、S 3H 、S 5H Synchronization, S 2H 、S 4H 、S 6H Synchronization, time delay T between two sets of switches s /2。
Referring to fig. 14a and 14b, fig. 14a is a schematic diagram of a six-phase power converter in the present application at a first operation stage, and fig. 14b is a schematic diagram of the six-phase power converter in the present application at a second operation stage. Namely S 1H 、S 3H 、S 5H Conducting phase and S 2H 、S 4H 、S 6H The conducting phase, the remaining phases are similar to the second phase shown in fig. 10b and the fourth phase shown in fig. 10 d.
Referring to fig. 15a and 15b, fig. 15a is a schematic diagram of a control signal for asynchronous control of a first six-phase power converter according to the present invention, and fig. 15b is a schematic diagram of a control signal for asynchronous control of a second six-phase power converter according to the present invention. Wherein S is 1H 、S 3H 、S 5H Without synchronization, S 2H 、S 4H 、S 6H Nor is synchronization required.
It should also be noted that in the present application, not only the output voltage V is provided LOW At 0 to V HIGH Continuously adjustable in/N, and can realize the following V LOW To V HIGH The boost pressure of (2) is not limited in this application.
In summary, the power converter in the present application is provided with the switched capacitor unit and the voltage reduction unit, and the switched capacitor unit is provided with the first front switch and the second front switch, and when the second front switch and the second rear switch are simultaneously turned on by controlling each of the switches, the two switches can be shunted, the current of each switch is reduced, and the withstand voltage is reduced, thereby reducing the turn-on loss of each switch.
On the basis of the above-described embodiment:
as a preferred embodiment, controlling the first back-end switch in each voltage-reducing unit to be turned on when the first front-end switch in the corresponding switched capacitor unit is turned on includes:
and controlling the first rear end switch in each voltage reduction unit to be switched on when the first front end switch in the corresponding switched capacitor unit is switched on, and synchronously switching on, and switching on the first rear end switches in each voltage reduction unit in a staggered way or in an unordered way.
When the first back-end switches in the voltage reduction units are controlled, the first back-end switches in the voltage reduction units can be synchronously conducted, staggered conducted or conducted out of order. Taking a six-phase power converter as an example, the first rear-end switches in the first, third and five voltage reduction units can be synchronously conducted, so that rapid dynamic response can be timely performed when the circuit dynamically changes, fluctuation of output current can be reduced when the circuit is conducted in a staggered mode, and operation difficulty of technicians can be reduced when the circuit is operated out of order. Of course, the selection of which conduction mode is not limited in the present application, and the requirements of the user can be satisfied.
As a preferred embodiment, the second terminal of the first front-end switch of the N-1 th switched capacitor unit is connected to the first terminal of the first back-end switch of the nth buck unit.
In this embodiment, the voltage of the front-end capacitor in the first switched capacitor unit is (N-1) V during stable operation HIGH V, the voltage of the front-end capacitor in the second switch capacitor unit is (N-2) V HIGH The voltage of the front-end capacitor in the N-1 th switch capacitor unit is V HIGH And the voltage of the front-end capacitor in the Nth switched capacitor unit is 0, so that the front-end capacitor in the Nth switched capacitor unit can be omitted, and correspondingly, the first front-end switch and the second front-end switch in the Nth switched capacitor unit can also be omitted, the circuit structure is simplified, and the circuit cost is reduced.
Based on this, the simplified practical circuit is an N-1 phase power converter, wherein the withstand voltage of the first front-end switch in the first switched capacitor unit is equal to V HIGH A withstand voltage of the first front-end switch in the second to N-1 th switched capacitor units is equal to 2V HIGH A withstand voltage of the second front-end switch in the first to N-1 th switched capacitor units is equal to V HIGH /N。
As a preferred embodiment, a first end of a first back-end switch in the voltage-reducing unit is a first end of the voltage-reducing unit, and a second end of the first back-end inductor is a second end of the voltage-reducing unit;
each voltage reduction unit is respectively connected with a plurality of voltage reduction units in parallel, the first ends of the voltage reduction units connected in parallel are connected, and the second ends of the voltage reduction units connected in parallel are connected;
control the first back-end switch in each step-down unit to switch on when the first front-end switch in the corresponding switched capacitor unit switches on, including:
and controlling the first rear end switches in the voltage reduction units to be switched on when the first front end switches in the corresponding switched capacitor units are switched on, and controlling the first rear end switches in the voltage reduction units connected in parallel to be switched on synchronously, in a staggered way or in a disorder way.
In this embodiment, a plurality of voltage reduction units can be connected to the back end of the same switched capacitor unit, and each voltage reduction unit is connected in parallel, so that the input current in each voltage reduction unit is reduced under the condition of the same output power, and the input current connected with the voltage reduction unit is also reducedThe effective value of the current in the switched capacitor unit reduces the conduction loss in the switched capacitor unit. Referring to fig. 16, fig. 16 is a schematic structural diagram of a power converter with multiple buck units connected in parallel according to the present invention. The voltage-reducing circuit comprises (N-1) phase switch capacitor units (N phase switch capacitor units if not simplified), wherein each phase switch capacitor unit is connected with M voltage-reducing units, and the total output comprises NxM voltage-reducing units. If the circuit implementation of the voltage reduction units is as shown in fig. 6, the duty ratio D = NV of each voltage reduction unit LOW /V HIGH (ii) a If the circuit implementation of the voltage reduction unit is fig. 20, the duty ratio D =2NV of each voltage reduction unit LOW /V HIGH It can be seen that, with this arrangement, the more phases there are in the present application, the closer the duty cycle of the switching tube in the voltage reduction unit is to 50%, the higher the switching utilization ratio is.
Referring to fig. 17a and 17b, fig. 17a is a schematic diagram of control signals for interleaving control of two-phase power converters with multiple buck units connected in parallel according to the present invention, and fig. 17b is a schematic diagram of control signals for out-of-order control of two-phase power converters with multiple buck units connected in parallel according to the present invention.
Wherein V in FIGS. 17a and 17b GSH11 、V GSH12 、V GSH13 Control signals, V, of first back-end switches of three voltage-reducing units connected for a first switched-capacitor circuit GSH21 、V GSH22 、V GSH23 And the control signals of the first rear end switches of the three voltage reduction units are connected with the second switched capacitor circuit.
Wherein the voltage of each switched capacitor unit is V HIGH Each switched capacitor unit is connected with one or more buck conversion units to realize V HIGH N to V LOW And (4) transforming.
It should be noted that the first back-end switches in the voltage-reducing units connected to the same switched capacitor unit may be turned on synchronously, turned on alternately, or turned on out of order, but the total time of turning on the first back-end switches in the voltage-reducing units connected to the same switched capacitor unit does not exceed the turn-on time of the first front-end switch in the switched capacitor unit, that is, each first back-end switch in each voltage-reducing unit connected to the same switched capacitor unit is turned on within the turn-on time of the first front-end switch.
Referring to fig. 18, fig. 18 is a schematic structural diagram of a power converter control system according to the present invention, where the system is applied to a power converter, the power converter includes N switched capacitor units and N voltage dropping units, and each switched capacitor unit and each voltage dropping unit are respectively connected in a one-to-one correspondence; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; the second end of a first front-end switch in the same switched capacitor unit is connected with a front-end capacitor, the front-end capacitor is connected with the first end of a second front-end switch, and the second end of the second front-end switch is grounded; the second end of the first rear-end switch in the same voltage reduction unit is connected with the first end of the second rear-end switch and the first end of the first rear-end inductor, the second end of the second rear-end switch is grounded, and the second end of the first rear-end inductor is connected with the low-voltage port; the second end of a second front-end switch in the switched capacitor unit is connected with the first end of a first rear-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of a first front-end switch in the first switched capacitor unit is connected with the high-voltage port, and a first end of a first front-end switch in the ith switched capacitor unit is connected with a second end of the first front-end switch in the (i-1) th switched capacitor unit; n and i are positive integers, i is more than 1 and less than or equal to N;
the system comprises:
the first control unit 181 is configured to control the first front-end switch and the second front-end switch in the same switched capacitor unit to be respectively turned on for a preset time in a first half of a conduction period or a second half of the conduction period, and the first front-end switch in the jth switched capacitor unit and the second front-end switch in the kth switched capacitor unit are synchronously operated; j and k are positive integers, j is an odd number less than or equal to N, and k is an even number less than or equal to N;
the second control unit 182 is configured to control the first back-end switch in each voltage reduction unit to be turned on when the first front-end switch in the corresponding switched capacitor unit is turned on, where the on-time is a product of a preset duty cycle and an on-period, and the on-time is shorter than the preset time;
the third control unit 183 is configured to control the second back-end switches in each voltage-reducing unit to be turned on when the corresponding first back-end switches are turned off.
For an introduction of a power converter control system provided by the present invention, please refer to the above method embodiments, and the present invention is not repeated herein.
Referring to fig. 19, fig. 19 is a schematic structural diagram of a power converter control apparatus according to the present invention, the apparatus includes:
a memory 191 for storing a computer program;
processor 192 for implementing the steps of the power converter control method as described above when executing a computer program.
For an introduction of the power converter control apparatus provided by the present invention, please refer to the above method embodiment, and the present invention is not repeated herein.
The computer readable storage medium in the present invention has stored thereon a computer program which, when executed by a processor, implements the steps of the power converter control method as described above.
For the introduction of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments, which are not repeated herein.
In order to solve the above technical problem, the present invention provides a power converter, which includes N switched capacitor units and N voltage reduction units;
each switch capacitor unit and each voltage reduction unit are respectively connected in a one-to-one correspondence manner; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; the second end of a first front end switch in the same switched capacitor unit is connected with a front end capacitor, the front end capacitor is connected with the first end of a second front end switch, and the second end of the second front end switch is grounded; the second end of the first rear-end switch in the same voltage reduction unit is connected with the first end of the second rear-end switch and the first end of the first rear-end inductor, the second end of the second rear-end switch is grounded, and the second end of the first rear-end inductor is connected with the low-voltage port; the second end of a second front-end switch in the switched capacitor unit is connected with the first end of a first rear-end switch in the voltage reduction unit corresponding to the second front-end switch; the first end of a first front-end switch in the first switched capacitor unit is connected with the high-voltage port, and the first end of the first front-end switch in the ith switched capacitor unit is connected with the second end of the first front-end switch in the (i-1) th switched capacitor unit; n and i are positive integers, and i is more than 1 and less than or equal to N.
As a preferred embodiment, a first end of a first back-end switch in the voltage-reducing unit is a first end of the voltage-reducing unit, and a second end of the first back-end inductor is a second end of the voltage-reducing unit;
each voltage reduction unit is respectively connected with a plurality of voltage reduction units in parallel, the first ends of the voltage reduction units connected in parallel are connected, and the second ends of the voltage reduction units connected in parallel are connected.
As a preferred embodiment, the voltage reducing unit further includes a third back-end switch, a fourth back-end switch, a second back-end inductor, and a back-end capacitor;
the rear-end capacitor is arranged between the first rear-end switch and the second rear-end switch; the first end of the third rear-end switch is connected with the second end of the first rear-end switch, and the second end of the third rear-end switch is connected with the first end of the second rear-end inductor and the first end of the fourth rear-end switch; the second end of the fourth back-end switch is grounded; the second end of the second back-end inductor is connected with the second end of the first back-end inductor.
Referring to fig. 20, fig. 20 is a schematic structural diagram of another voltage reduction unit provided in the present invention. Wherein, S in FIG. 20 H1 Is a first back-end switch in the voltage-reducing unit, S L1 Is a second back-end switch in the voltage-reducing unit, S H2 Is a third back-end switch in the buck unit, S L2 Is a fourth back-end switch in the voltage-reducing unit, C S1 Is a back-end capacitor, L 1 Is a first back-end inductor, L 2 Is a second back-end inductor.
For the description of the power converter provided by the present invention, please refer to the above method embodiment, and the present invention is not repeated herein.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A power converter control method is characterized by being applied to a power converter, wherein the power converter comprises N switch capacitor units and N voltage reduction units, and each switch capacitor unit and each voltage reduction unit are respectively connected in a one-to-one correspondence manner; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; a second end of the first front-end switch in the same switched capacitor unit is connected with the front-end capacitor, the front-end capacitor is connected with a first end of the second front-end switch, and a second end of the second front-end switch is grounded; a second end of the first rear-end switch in the same voltage reduction unit is connected with a first end of the second rear-end switch and a first end of the first rear-end inductor, a second end of the second rear-end switch is grounded, and a second end of the first rear-end inductor is connected with a low-voltage port; a second end of the second front-end switch in the switched capacitor unit is connected with a first end of the first back-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of the first front-end switch in a first one of the switched capacitor units is connected to a high-voltage port, and a first end of the first front-end switch in an ith one of the switched capacitor units is connected to a second end of the first front-end switch in an (i-1) th one of the switched capacitor units; n and i are positive integers, i is more than 1 and less than or equal to N;
the method comprises the following steps:
controlling the first front-end switch and the second front-end switch in the same switched capacitor unit to be respectively conducted for preset time in the first half of the conducting period or the second half of the conducting period, and enabling the first front-end switch in the jth switched capacitor unit and the second front-end switch in the kth switched capacitor unit to synchronously act; j and k are positive integers, j is an odd number less than or equal to N, and k is an even number less than or equal to N;
controlling the first rear-end switch in each voltage reduction unit to be conducted when the first front-end switch in the corresponding switched capacitor unit is conducted, wherein the conduction time is the product of a preset duty ratio and the conduction period, and the conduction time is less than the preset time;
and controlling the second back-end switches in the voltage reduction units to be switched on when the corresponding first back-end switches are switched off.
2. The power converter control method of claim 1, wherein controlling the first back-end switch in each of the buck units to conduct when the first front-end switch in the corresponding switched-capacitor unit conducts comprises:
and controlling the first rear end switch in each voltage reduction unit to be switched on when the corresponding first front end switch in the switched capacitor unit is switched on, and controlling the first rear end switch in each voltage reduction unit to be switched on synchronously, in a staggered way or in a disorder way.
3. The power converter control method of claim 1 wherein the second terminal of said first front-end switch of the (N-1) th of said switched-capacitor cells is connected to the first terminal of said first back-end switch in the (N) th of said buck cells.
4. The power converter control method of claim 1, wherein a first terminal of the first back-end switch in the buck unit is a first terminal of the buck unit, and a second terminal of the first back-end inductor is a second terminal of the buck unit;
each voltage reduction unit is respectively connected with a plurality of voltage reduction units in parallel, and the first ends and the second ends of the voltage reduction units connected in parallel are connected with each other;
controlling the first back-end switch in each of the voltage-reducing units to be turned on when the first front-end switch in the corresponding switched capacitor unit is turned on, including:
and controlling the first rear end switches in the voltage reduction units to be switched on when the corresponding first front end switches in the switched capacitor units are switched on, and controlling the first rear end switches in the voltage reduction units connected in parallel to be switched on synchronously, in a staggered way or in an unordered way.
5. A power converter control system is applied to a power converter, the power converter comprises N switch capacitor units and N voltage reduction units, and each switch capacitor unit and each voltage reduction unit are respectively connected in a one-to-one correspondence manner; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; a second end of the first front-end switch in the same switched capacitor unit is connected with the front-end capacitor, the front-end capacitor is connected with a first end of the second front-end switch, and a second end of the second front-end switch is grounded; a second end of the first rear-end switch in the same voltage reduction unit is connected with a first end of the second rear-end switch and a first end of the first rear-end inductor, a second end of the second rear-end switch is grounded, and a second end of the first rear-end inductor is connected with a low-voltage port; a second end of the second front-end switch in the switched capacitor unit is connected with a first end of the first back-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of the first front-end switch in a first one of the switched capacitor units is connected to a high-voltage port, and a first end of the first front-end switch in an ith one of the switched capacitor units is connected to a second end of the first front-end switch in an (i-1) th one of the switched capacitor units; n and i are positive integers, i is more than 1 and less than or equal to N;
the system comprises:
the first control unit is used for controlling the first front-end switch and the second front-end switch in the same switched capacitor unit to be respectively conducted for preset time in the first half of the conducting period or the second half of the conducting period, and the first front-end switch in the jth switched capacitor unit and the second front-end switch in the kth switched capacitor unit synchronously act; j and k are positive integers, j is an odd number less than or equal to N, and k is an even number less than or equal to N;
the second control unit is used for controlling the first rear-end switch in each voltage reduction unit to be conducted when the corresponding first front-end switch in the switched capacitor unit is conducted, the conducting time is the product of a preset duty ratio and the conducting period, and the conducting time is shorter than the preset time;
and the third control unit is used for controlling the second rear-end switch in each voltage reduction unit to be switched on when the corresponding first rear-end switch is switched off.
6. A power converter control apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the power converter control method according to any one of claims 1 to 4 when executing said computer program.
7. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of a power converter control method according to any one of claims 1 to 4.
8. A power converter is characterized by comprising N switch capacitor units and N voltage reduction units;
each switch capacitor unit is connected with each voltage reduction unit in a one-to-one correspondence manner; each switch capacitor unit comprises a first front end switch, a second front end switch and a front end capacitor, and each voltage reduction unit comprises a first rear end switch, a second rear end switch and a first rear end inductor; a second end of the first front-end switch in the same switched capacitor unit is connected with the front-end capacitor, the front-end capacitor is connected with a first end of the second front-end switch, and a second end of the second front-end switch is grounded; a second end of the first rear-end switch in the same voltage reduction unit is connected with a first end of the second rear-end switch and a first end of the first rear-end inductor, a second end of the second rear-end switch is grounded, and a second end of the first rear-end inductor is connected with a low-voltage port; a second end of the second front-end switch in the switched capacitor unit is connected with a first end of the first back-end switch in the voltage reduction unit corresponding to the second front-end switch; a first end of the first front-end switch in a first one of the switched capacitor units is connected to a high-voltage port, and a first end of the first front-end switch in an ith one of the switched capacitor units is connected to a second end of the first front-end switch in an (i-1) th one of the switched capacitor units; n and i are positive integers, and i is more than 1 and less than or equal to N.
9. The power converter of claim 8, wherein a first terminal of the first back-end switch in the buck unit is a first terminal of the buck unit, and a second terminal of the first back-end inductor is a second terminal of the buck unit;
each voltage reduction unit is respectively connected with a plurality of voltage reduction units in parallel, the first ends of the voltage reduction units connected in parallel are connected, and the second ends of the voltage reduction units connected in parallel are connected.
10. The power converter control method of claim 8, wherein the buck unit further comprises a third back-end switch, a fourth back-end switch, a second back-end inductor, and a back-end capacitor;
the rear-end capacitor is arranged between the first rear-end switch and the second rear-end switch; a first end of the third back-end switch is connected with a second end of the first back-end switch, and a second end of the third back-end switch is connected with a first end of the second back-end inductor and a first end of the fourth back-end switch; a second end of the fourth back-end switch is grounded; the second end of the second back-end inductor is connected with the second end of the first back-end inductor.
CN202211265873.6A 2022-10-17 2022-10-17 Power converter control method, system and device and power converter Active CN115514217B (en)

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